STUDIO 3+1 ARCHITETTI ASSOCIATI Via Bradano, n. 3c, 00199 Rome - Italy Tel.: (+39) 06.4440681 Fax: (+39) 06.30194149 bdglobal@3piu1.com www.3piu1.com

A4

GD034

AFRICAN DEVELOPMENT BANK 11-12 TS, 5th Floor HQ Building Abidjan – Côte d’Ivoire Phone (Standard): +225 2026 3900 https://www.afdb.org/en/

FILE NAME: 2018_05_MLW_AFDB_COMW_GD_DD_PS_WRD_00

OCRA SRL Via Castelrosso, n. 10, 00144 Rome - Italy Tel.: (+39) 06.5913587 Fax: (+39) 06.5913587 info@ocrastudio.com www.ocrastudio.com

STAGE

NAME

Drawn Checked Approved

M. BORGNA

V.G. RAMIRES POMELLA

S. MALOMBE

STAMPS

REV. NO. DESCRIPTION DATE

DETAILED DESIGN

SECTION OF REFERENCE GENERAL DOCUMENT TITLE PREAMBLES AND SPECIFICATIONS

SIZE

RFP REF - ADB/RFP/COMW/2018/0519

00 FIRST ISSUE

22 / 02 / 2018

MAIN CONSULTANT

CLIENT

Contract number: CHGS1/COMW/2018/07/001

DOC. N°

ARCHITECTURAL & ENGINEERING DESIGN AND SUPERVISION OF REFURBISHMENT WORKS FOR THE AFRICAN DEVELOPMENT

BANK'S COUNTRY OFFICE IN LILONGWE, MALAWI

SUB CONSULTANT

RUO CONSULTANTS LTD Keza Office Park,Block 3, Ground Floor, Chichiri, Blantyre, Malawi Postal address: P.O. Box 31371, Chichiri, Blantyre, Malawi Tel.: (+265) 879773 - Fax: (+265) 881831224 mail@ruoconsultants.com www.ruoconsultants.com

Architectural & Engineering Design and Supervision of Refurbishment Works for the African Development Bank's Country Office in Lilongwe, Malawi.

2 di 2

PAGE INTENTIONALLY LEFT BLANK

DISTRUCTION NOTE: This report and its annexes are intended for official use only. Destroy documents and drawings by any method that will prevent disclosure of contents or reconstruction of the document to not authorized persons.

SECTION 6A SCOPE OF WORKS

Description of the Works The works comprise the Refurbishment of Existing Floor at Kang’ombe Building:- Remove existing drywall partitions and replace with new aluminium glazed partitions Replace carpet tiles with porcelain tiles Remove door frame and door Scraping off existing paint to walls and paint with Rainbow Acrylic Sheen White Scraping off existing paint to door and window frames and apply Rainbow Fleetline White paint Scraping off existing paint to teller counters and apply Rainbow Fleetline White paint Servicing of Fire Fighting equipment Water services and Electrical Services CCTV and Security

6B TECHNICAL SPECIFICATIONS

STANDARD SPECIFICATION

The Standard Specification shall be the Standard Specification for Road and Bridge Works (Metric Edition), issued by the Malawi Government, Ministry of Works and Supplies, Design Department in April, 1978, hereinafter referred to as the "Standard Specification", a copy of which can be obtained from the Public Works Laboratory, Materials Section. The Standard Specification shall be read in conjunction with the particular Specification, which may supersede, vary or amplify the provisions of the Standard Specification. The Standard Specification as amended by the Particular Specification shall hereinafter be referred to as the "Specification". The Tenderer shall be deemed to have included in his Tender for complying in full with the terms and requirements of the Specification.

35

Particular Preambles

General The costs and allowance for items described in the Bill are to be included in the rates for measured work in succeeding Bill where applicable. The Contractor shall examine all sections of the Preambles for requirements which affect work of any one section whether or not such work is specifically mentioned in the said section. The Contractor shall coordinate work with that of all other trades affecting or affected by work contained in any one particular section. The Contractor shall cooperate with such trades to assure the steady progress of all work under this Contract. The whole of the materials used in the works shall be new unless otherwise described. Materials specified of proprietary manufacture may be substituted by materials of different manufacture provided that such substitutes are in all respects equal to the original specification and that the Engineer’s prior written approval is obtained to all substation effected. All proprietary materials are to be used, fixed or applied in accordance with the manufacturer’s instructions. Workmanship generally is to be of the highest standard obtainable and in all cases where a British Standard Code of Practice exists and is applicable to any portion of the works, the Contractor shall allow for complying with the recommended Practice unless this procedure would conflict with requirements stated elsewhere in the Contract Documents. In the vent of the detailed description of any measured items or group of items in the Bills of Quantities conflicting with the General Specifications Clauses contained in the Preambles, the detailed description of the measured work shall take precedence. In the event of these Preambles conflicting with the provisions of any specification forming part of the Contract or with any specification forming part of the Contract Drawings then either case the later shall precedence. The Preambles relating to each particular section shall apply equally to all work carried out of a similar nature under other sections (i.e. excavation and earthwork Preambles apply equally to External Works).

B. Technical Specifications

Item DEFINITIONS The following are the definitions of terms used in the contract documents:

A The term ‘Project Manager” shall mean the ……………………, Blantyre, Malawi.

B “Contractor” shall mean the person or persons appointed to execute the Works.

C “Nominated Sub-Contractor” shall mean the person or firm nominated or selected by the Project Manager in accordance with the Conditions of Contract to execute a portion of the Works for which a P.C. or Provisional Sum, as hereinafter defined, is included in the Bills of Quantities.

D “Approved” or “Directed” shall mean respectively approved or directed in writing by the Project Manager.

E “Or other equal and approved” or similar phrase shall mean an alternative of equal quality and price, which has been approved in writing by the Project Manager as being a satisfactory substitute for the item described.

F “Making good” shall mean reinstatement to the complete satisfaction of the Project Manager.

G “Take delivery and fix only” or similar phrase shall mean off loading at the nearest railway station or merchant’s store or taking delivery of imported items from the customs and excise department, transporting to site, unloading, unpacking, and checking on arrival, immediately reporting any damage or deficiencies to the Project Manager and storing and protecting on site until required, taking from store, distributing and assembling as necessary and hoisting and fixing complete and, if required by the supplier, for returning crates and packing cases in good condition, carriage paid, and for making good any theft, loss or damage to the goods whilst on the site, in storage, whilst fixing and when in position. The Contractor shall carefully check the quantity, quality and condition of all items before taking delivery as any goods subsequently found to be missing or damaged shall be replaced at his own expense. It shall be the responsibility of the Contractor to make and pursue any claim against the Railways, Insures or other parties in event of any loss or damage.

H “Attendance” shall mean assisting and collaborating with any sub-contractors and specialists and their tradesmen in every respect including obtaining particulars of their requirements concerning work to be executed for them by the Contractor, supplying them with and taking responsibility for accurate dimensions, details and particulars relating to their work, providing full facilities to enable their employees to execute their work, providing full use, free of charge, of storage and working space, lock up accommodation, standing scaffolding, ladders and other plant, maintaining, altering, shifting and removing same as required, unloading and hoisting their plant and materials or assisting to do so and providing them free of charge, with water, watching, artificial lighting and electric power, covering up and protecting their goods and materials and their work and making good any loss or damage and supplying all unskilled labour in respect of the foregoing.

I Against the railways, Insurers or other parties in event of any loss or damage J “Attendance” shall mean assisting and collaborating the any sub-contractors and

specialists and their tradesmen in every respect including obtaining particulars of their requirement concerning work to be executed for them but the Contractor, supplying them with and taking responsibility for accurate dimensions, details and particulars DEFINITIONS (cont’d)

relating to their work, providing full facilities to enable their employees to execute

their work, providing full use, free of charge, of storage and working space, lock up accommodation, standing scaffolding, ladders and other plant, maintaining, altering, shifting and removing same as required, unloading and hoisting their plant and materials or assisting to do so and providing them free of charge, with water, watching, artificial.

A Lighting and electric power, covering up and protecting their goods and materials

and their work and making good any loss or damage and supplying all unskilled labour in respect of the foregoing.

B “Extra over” shall mean that a portion of the cost of the item following this term

is included elsewhere in another item and only the extra cost of additional labour and / or materials is required to be priced with the item so described.

C “Measured separately” shall mean that the work to which the term refers is

included elsewhere in the bills of Quantities for pricing and does not require pricing in which it so described.

D “Small pipe” shall mean a pipe having an internal diameter of 55 mm or under,

“large pipe” shall mean a pipe having an internal diameter exceeding 55 mm and not exceeding 110 mm and “extra-large” pipe shall mean a pipe having an internal diameter exceeding 110 mm.

E “M.B.S.” shall mean the latest edition or amended edition of the relevant

Malawi bureau of Standards Specification Published by the Malawi Bureau of Standards, Moir Road, P.O. Box 946, Blantyre.

F “S.A.B.S.” shall mean the latest edition or amended edition of the relevant

South Africa Bureau of Standards Specification published by the South Africa Bureau of Standards, Private Bag X 191, Pretoria, South Africa.

G “B.S.” shall mean the latest edition or amended edition of the relevant British

Standard Specification published by the British Standard Institute, British Standards House, 2 Park Street, London, W1A 2 BS, England.

H “C.P.” shall mean the latest edition or amended edition of the relevant British

Standard Code of Practice or other approved Standard Code of practice.

I “Provisional Sum” shall mean a sum provided for work or for cost which cannon be entirely foreseen, defined or detailed at the time tender documents are issued.

J “Prime Cost Sum” or the abbreviation “P.C. Sum” shall mean a sum provided for

work or services to be executed by a nominated sub-contractor or statutory authority or public undertaking or statuary authority or public undertaking or for materials or goods to be obtained from a nominated supplier. Such sums shall be deemed to be exclusive of any profit require by the Contractor and provisional should be make for the addition thereof P.C. Sum in respect of nominated suppliers shall mean the net amount to be paid to a supplier or merchant after deducting any trade or other discount, except the discount for cash defined hereinafter, and shall include the cost of packing and of carriage and delivery.

ALTERNATIVE MATERIALS COMPONENTS AND GOODS SPECIFIED A Wherever materials, components and goods, whether basic or proprietary, are

specified the Contractor may, subject to approval in writing, used materials, components and goods from an alternative source providing the quality, properties design are similar.

B All materials, components and goods shall be used and fixed in an approved

manner and, where applicable, in accordance with the manufacturer’s instructions. ALTERNATIVE STANDARDS C wherever reference is made in the Contract Documents to Malawi Bureau of

Standard or British Standards and Codes of Practice or South Africa Bureau of Standards the latest or amended edition shall apply. Alternatively, the latest editions of the standards the latest or amended edition shall apply. Alternatively, the latest editions of the standard issued by other authoritative bodies shall apply, providing that the Contractor satisfied the Project Manager that the standards are equal or of better standard than the above standards.

EXCAVATION GENERAL D It shall be deemed that the Contractor has visited the site to make himself

thoroughly acquainted with the nature of the materials to be excavated and has consulted all available information concerning the nature of this material before submitting his tender as no extra cost will be allowed by reason of his failure to do so.

CLEAR SITE E Clear site shall mean the clearing away of all rubbish, grass, shrubs, bushes, trees

not exceeding 600 mm girth, measured 1000 mm above ground level, and tree stumps not exceeding 600 mm girth, measured as ground level, and the grubbing up of roots. Root holes shall be cleaned out filed with earth and well rammed and consolidated. All unusable materials resulting from clearing the site shall be burned on an approved part of the site.

F All timber of site shall remain the property of the Employer. The Contractor

shall allow for cutting to portable lengths and stacking in an approved position on the site.

EXCAVATION G The term “excavation” shall mean excavating in all types of ground met with

other than hard stones or rock of such size or position that it can, in the opinion of the Architect / Supervising Office only be removed by barring, wedging, drilling, splitting of blasting and shall include excavating in made up ground, soft rock, gravels, shale, clay, etc. and shall also include for grubbing up and removing any minor obstructions, including boulders not exceeding 0.14 cubic metres in volume, drains, clinker and gravel paths, tree roots, etc and for filling in voids with approved materials from the excavations.

GENERAL (cont’d) A The term shall also include for removing the excavate materials from the trench

and depositing in temporary spoil heaps in readiness for backfilling or removal from site.

B Should excavations be made below or beyond the dimensions and levels shown or

required to obtain a solid bottom, and in the case of tree stumps being remove, the Contractor must fill up the excavation to the correct level with weak concrete Grade 10/40.

C No concrete foundations shall be poured until the Project Manager and Local

Authority have approved the excavations. EXCAVATION D Notwithstanding any authorization, approval or direction given by the Project

Manager with regard to excavation or any matter or things connected therewith, the Contractor shall be responsible for taking necessary precautions against any damage from the operations.

MEASUREMENT E The measurement of all excavations and subsequent disposal are those before

excavation or after compacting in the case planking and strutting shall be allowed for by the Contractor in his rates.

F Excavation and disposal items have been measured in accordance with the

Standard Method of Measurement of Building Works in Malawi and the Contractor is to allow in his rates for additional excavations, filling and ramming and any formwork which he may consider necessary to carry out the Works.

G All excavations shall be deemed to commence from ground level or reduced level except where otherwise expressly stated and the Contractor is to include in his rates for any additional handling which he may incur.

H Rates for excavations shall include levelling or grading, watering and consolidation

to form a solid bottom and for trimming sides and for forming any necessary steps in foundations as directed.

I The Contractor is to include in his items of excavation and disposal for any

additional handling he may incur due to the manner or order in which he carries out the work.

ROCK J Should any rock be encountered, the Contractor shall notify the Quantity

Surveyor immediately before excavating same in order that the quantity thereof may be assessed.

K The Contractor is to include in his rates for excavating in rock and for removing

any additional materials arising from over break or over blast and for the additional filling occasioned thereby. The Contractor must provide for any method of removal which may be adopted as there is no guarantee given or implied that blasting will be permitted.

MEASUREMENT (cont’d) BACKFILLING A Filling in of excavated materials is measured after consolidated. All refilling of

excavated material next to foundations, etc. is to be carried out, unless otherwise described, in layers not exceeding 150 mm thick with the best, clean, dry, excavated materials free from rubbish or refuse and is to be approved by the Project Manager for this purpose. If excavated materials are not suitable, imported laterite is to be used to the approval of the Project Manager. Every layer is to be well watered and rammed before another layer is deposited.

HARDCORE B Hardcore is to consist of hard stones, coarse graves, sound slag, had broken bricks

or other inert materials to pass a 100 mm diameter ring and is to be blinded with fine chippings, ash or sand ready to received concrete slab.

C The hardcore slabs and filling to make up levels shall be laid to the minimum

finished thickness and compacted until a mechanical interlock is obtained and to a standard consistent with the use of a 2.5/3 tonne roller. The surface of the hardcore is then to be checked to ensure that a true level has been obtained over the whole area.

D The rates for hardcore filling are to include for all necessary temporary boards.

E The ant repellent is to be aldrin, dieldrin, shell rite, chlordane or heptachlor diluted with water and applied by or watering can strictly in accordance with the manufacturer’s instructions.

F The Contractor is to ensure that the surface to be sprayed is cleaned of all foreign

matter before and after application. Great core is to be taken to prevent disturbance of the treated surface and the Contractor is include in his rates for providing raised barrow runs or other means to prevent disturbance of the treated surface.

G The Contractor shall furnish to the Project Manager a guarantee covering the

content and quality of the work for a period of five years. Within this guarantee covering the content and quality of the work for a period of five years. Within this guaranteed period the Contractor must undertake to retreat, without further charge, any area showing re-infestation.

WATER IN EXCAVATIONS H excavations shall be kept free from water at all times. The responsibility for

removing water shall rest with the Contractor and no claim for expenses incurred will be entertained. Where pumping is necessary the materials in and around the excavations shall not be disturbed by pumping all pumps shall be formed clear of excavations for permanent work. The Contractor shall divert as all ditches and other waterways wherever encountered during the progress of the Works.

MEASUREMENT (cont’d) PLANKING AND STRUTTING A Plank and strut the sides of all excavations as necessary to ensure the safety of the

workmen and to prevent any movement, all to the satisfaction of the Project Manager. All responsibility for the foregoing shall rest entirely with the Contractor and should any of the excavations, other than that required to be excavated, collapse due to the omission or the insuffiency of the planking and strutting, it will be paid for as excavations and must be dug out and deposited on the site, backfilled or carted away and the depression filled in as directed by the Project Manager the contractor’s expense.

Should the Project Manager reasonably consider that adequate safety is not

provided he may instruct the Contractor accordingly and extra planking and strutting shall be provided at the contractor’s own expense.

CONCRETE WORK

GENERALLY

B Materials and workmanship shall comply with B S 8110 Part 1 1985 “Structural

Use of Concrete” except as varied by this specification. CEMENT C Cement shall comply with M B S 0066 and shall be delivered to the site in sealed

and branched bags properly protected from the weather during transport. Admixtures shall be used only if instructed or approved.

D The cement shall be store in a waterproof shed on a dry floor raised above the

ground and stacked in such a manner that individual consignments are used in the Works in the order in which they are received. Any cement found to be damp, contaminated to have deteriorated will be condemned by the Project Manager.

AGGREGATES E Fine and coarse aggregates shall comply with B.S. 882 Coarse aggregate shall

satisfy the grading limits defined for 20 mm aggregate graded down to 5 mm. F Aggregated shall be stored on concrete or other hard standing with dividing

aggregate walls between each type of aggregate. WATER G Water shall be clean, fresh from an approved source and shall be free chemical or

organic impurities or other deleterious matter.

Item CONCRETE PROPORTIONS A The proportions for concrete shall be as follows:-

NOMINAL MIX (GRADE)

PROPORTIONS OF MIX BY VOLUME Cement Fine Agg. Coarse Agg.

MINIMUM CRUSHING TRENGTH (CUBE STRENGTH) IN N/mm 7 days 28 days

1:1:5:3 1:2:4 1:3:6 (15/40) 1:4:8 (10/40)

1 Cu. ft: 1.5 Cu. ft: Cu. ft 50 Kg bags: 0.05 m2: 0.1 m2 (up to 20 mm) 1 Cu. ft:2 Cu. ft :4 Cu. ft 50 Kg bag : 0.07 m2: 0.14 m2 (up to 20 mm) 1 Cu.ft: Cu ft:6 Cu. ft 50 Kg bag : 0.1 M2: 0.2 m2 (up to 40 mm) 1 Cu. ft: 4 Cu. Ft : 8 Cu. ft 50 Kg bag: 0.14 m2 : 0.28 m2 (up to 40 mm)

16.5

13.5

10

25

20

15

B The proportions given for the concrete mixes are by volume. The quantities in

each batch shall be so calculated as to use one or more whole bags of cement in each batch. One pocket (bag) of cement is equivalent to one cubic foot. The use of cement from split bags will not be permitted.

C The coarse and fine aggregate shall be measured in approved gauge boxes. D The quantity of water used shall be minimum to produce a dense concrete of

adequate workability for its purpose. The workability shall be strictly maintained by carefully control of water added.

MIXING E The cement and aggregate shall be mixed dry in an approved revolving drum

mixer for two minutes and then for a continuous period of at least two minutes after the water has been added until the whole mass is of uniform colour and consistency. The whole batch shall be discharged from the mixer before a fresh batch is added.

F Hand mixing may be permitted in special circumstances. When permission has

been granted for hand mixing, the Contractor shall use 10 per cent additional cement at his own expense and produce concrete not inferior in strength to

machine-mixed concrete. Mixing shall be carried out on a clean, close-joined timber or metal mixing platform.

G Immediately on cessation of work the drum mixer and / or mixing platform shall

be cleaned. TRANSPORTING AND PLACING A Concrete shall be transported from the mixer to its position in the structure as

quickly as possible and in such a manner as to avoid any risk of segregation, consolidation or drying out and shall be compacted into poison before it has taken initial set.

B Unless otherwise authorized by the Project Manager compacting shall be

accomplished with the use of immersion vibrators together, if necessary, with rods, shovels and the like.

C If the Contractor wished to use an alternative means of compacting for any

portion of the Works, he shall submit his proposals and shall receive the Project Manager’s approval before commencing this portion of the Works.

D Vibrators shall be of a suitable type and used in sufficient number to suit the

nature of the work and quantities of concrete placed. E only men experience in the use of vibrators shall be employed on this type of

work. Particular care shall be taken to fill all voids and to work the concrete against rock and existing concrete surfaces round the reinforcement and embedded fixtures and into corners of formwork.

F Vibration shall be continued at each point until the concrete to contract and a thin

layer of mortar has appeared on the surface and air bubbles have ceased to appear. Vibrators shall be inserted vertically to penetrate into the layer underneath at regular spacing which shall not exceed the distance over which vibration is visibly effective nor more than 750 mm. Vibrators shall not be used to move concrete laterally and shall be withdrawn slowly to prevent the formation of voids.

G In reinforced concrete, great care shall be taken to prevent any displacement or

damage to the reinforcement during compaction. PROTECTION AND CURING H Immediately after compaction, the concrete shall be protected from cold, heat,

drying winds, rapid evaporation of water and from running water. The concrete shall be kept constantly damp for the first 7 days of its hardening by means of spraying, damp sand, waterproof paper, polythene or other approved materials.

I Works shall not be permitted on slabs for 7 days or until the cube strength is 1

N/sq.mm or twice the stress to which it will then be subjected, whichever is the greater period.

CONSTRUCTION JOINTS

J The Contractor shall, well before concreting, submit to the Project Manager details proposals for methods of forming and location of construction joints.

K Construction joints shall be as few as possible. L Construction joints shall be made at right angle to the main reinforcement and

shall be formed square against firm stopping-off boards, slotted if necessary to allow continuity of reinforcement. The stopping-off boards shall be removed as soon as possible after placing the concrete without risk of movement to the concrete.

PLACING OF NEW CONCRETE AGAINST OLD A In re-staring work which has been stopped, the surface of the existing concrete

shall be hacked, roughened, and thoroughly cleaned and hosed down with water to remove all loose particles. Before concreting is recommenced, the hacked and roughened surface shall be wetted covered with a thin layer of freshly mixed mortar, composed of cement and find aggregate in the same proportion as the concrete mix.

TESTING B As and when requested by the Project Manager, the Contractor shall, at his own

expense, provide sets of four standard 150 mm test cubes, and carry out a slump test when each sample is made for making test cubes.

SAMPLING C Each cube shall be made from a single sample taken from a randomly selected

batch of concrete, where practicable, taken at the point of discharge from the mixer.

D A batch of concrete is the quantity of concrete mixed in one cycle of operation of

a mixer, the quantity carried by ready-mix vehicle, or the quantity discharge in one minute from a continuous mixer.

E Concrete shall be sampled using a standard scoop (holding approximately 5 kg

mass of concrete), referred to as a coop below. In sampling to make test cubes, one test cube shall be from a sample consisting of two scoops taken from one batch nominally divided into a number of equal parts equal to the number of scoops required, a scoop being taken from each part but disregarding the very first part and last part of the discharge.

F The number of scoops required will be:-

One 150 cube - 2 Slump test - 4 G A sample shall be taken from one batch selected randomly from the following

quantities of concrete:-

Sampling

Rate 1 Rate 2 Rate 3

10 cu m or 10 batches

20 cu m of 20 batches

50 cu m or 50 batches

H At the commencement of the Works, the sampling rate shall be Rate 1. if

concrete is satisfactory, Rate 2 may be applied. If subsequent failure to meet requirements occurs, Rate 1 shall be reapplied until results are satisfactory.

I Fresh concrete samples shall at all stages be protected against or losing water an excessive temperatures.

PLACING OF NEW CONCRETE AGAINST OLD A Sample shall be taken by a person charged with responsibility for taking samples

who shall provide certificates giving the following information:-

(a) Date and time of sampling (b) Location in the works of the concrete the sample represents (c) Location of sample (e.g. mixer discharge or from heap) (d) Sample identification mark (e) Ambient temperature and weather (f) Identification marks of cubes made from sample (g) Slump test result (h) Name of sampler (i) Name of person responsible

SLUMP TEST REQUIREMENTS

B The slump shall not exceed 50 mm for mass concrete, 40 mm for vibrated

concrete and 75 mm for hand compacted concrete. STRENGTH REQUIREMENTS C Compliance with the specified characteristic strength shall be assumed if :- D The average strength determined from any ground of four consecutive test cubes

and the lowest strength of an individual cube shall exceed the value shown below :-

Characteristic Strength N/mm

Average cube strength N/mm

Min. individual cube strength N/mm

10 15 20 25

13.33 20.00 27.50 32.50

8.50 12.75 17.00 21.50

E One cube fails to meet the requirements for an individual cube the result shall be

considered to represent only the batch of concrete from which that cube was taken provided the result for the average strength is satisfied.

F More than one cube result fails to meet the requirement for individual cubes or if

the average cube result fails to meet the requirement for average strength then all the batched represented by all cubes shall be deemed not to comply with strength requirements.

G In the event of test cubes failing to meet the above requirements the Contractor shall be directed to take to take such remedial action as the Project Manager may consider necessary. This action may include the cutting out of the concrete or the taking of cores for further testing at the Contract’s expense.

STRENGTH REQUIREMENTS H From time to time, the Project Manager may direct that additional cubes be made

to check the attained strength levels of parts of the structure or for other particular purposes. These cubes shall be taken, stored and tested in a manner suitable for their purpose as directed by the Project Manager. No extra payment will be made for such special cubes.

REINFORCEMENT (cont.’s) A Type F2: This type is for surfaces exposed to view where good appearance and

alignment are important. Formed or closely jointed wrot timber, plywood or steel forms arranged in an approved uniform pattern. Whenever possible, joint shall be arranged to coincide with architectural features or changes in direction of the surface joints shall be vertical and horizontal unless otherwise directed. Slight grain and joint marks and small blemishes cause by entrapped air or water are permissible.

FORMWORK B Type S; Formed as F1 then scabbled to leave a keyed surface for subsequent

rendering or as construction joint preparation. C Type SP: This type is for exceptional or special appearance. The surface shall be

superior to F2, profiled or profiled with further surface treatment, as specified. D Uniformed surface shall be as follows:- E Type U1: The concrete shall be uniformly levelled and screeded to produce a

plain, textured or ridged surface, prior to receiving an applied finish or where a superior finish is not required.

F Type U2: after forming a surface finish Type U1 and after the moisture film has

disappeared and the concrete has hardened sufficiently to prevent laitance from being worked to the surface, the surface shall be steel trowel-led under firm pressure to produce a dense, smooth uniform surface free from trowel marks.

REMOVAL OF FORMWORK AND SUPPORTS G Formwork and supports shall be carefully removed without shock loading or

disturbance to the concrete. No formwork shall be removed until the concrete has gained sufficient strength to withstand without damage the stresses to which it may be subjected.

H If the Contractor wishes to strip soffit formwork, to beams or slabs before the

due period for the supports, the formwork shall be suitable for removal without disturbing the supports.

I The Contractor shall be responsible for the removal of formwork without damage

to the concrete. The minimum period given below between completion of placing concrete and removal of forms is given as guidance. If the period is determined by strength the attained strength must be determined by making test cubes and curing them under the same conditions as the concrete to which they refer.

REMOVAL OF FORMWORK AND SUPPORTS

Position of form

Vertical or near vertical faces of mass concrete, columns, walls and beams Soffit (formwork only) to Beams Supports to beams

9 hrs 12 hrs 8 days 14 days 15 days 21 days

0.3 fcu )10N/sq mm or twice the )stress to which the )Concrete will be )Subjected – whichever is the greater

A The aforementioned periods of time apply for ordinary Portland cement only.

The periods of the time shall be increased for lower temperatures. DIMENSIONAL TOLERANCES B Construction shall be sufficiently accurate so as not to significantly impair

appearance or performance of the building. In additions, he following tolerances shall apply:-

C Thickness of walls and slabs, width and depth of beams and columns + 10 per

cent or + 20 mm whichever is the lesser. Verticality of centreline of columns and walls, + 20 mm in one storey and + 40 mm in two or more storeys.

SUNDRY LABOURS D Perform all sundry labours necessary for the full and proper execution of the

work. PROTECTION E Include for the proper protection of all concrete work throughout the section. PRECAST CONCRETE F The specification for in-situ concrete will apply except as varied in this section. G Precast units shall have proper lifting attachments suitably located to minimize

stresses during handling. The strength of the concrete shall be sufficient to withstand handling and placing stresses.

H Units shall be placed in a manner that minimizes shock loadings to the units and

structure. Units shall be stored in a manner which shall not cause distortion or damage of the units. When stacked, units shall be separated by packing to prevent transmission of bending loads to lower units. Packing shall not discolour or otherwise permanently damage the units.

I All units shall be of uniform appearance, of the same texture and colour, and

where an approved sample has been used, they shall match the approved sample. PRECAST CONCRETE (cont’d) A The Contractor shall be used temporary supports required to resist all

construction loads, including wind, likely to be encountered. B Unless shown otherwise on the drawings units shall be bedded and jointed in (1:3)

cement and sand mortar thoroughly compacted, pointed and finished as necessary to match surrounding work and carefully cleaned down on completion.

C The Contractor is to include for all necessary moulds, formwork, templates,

handling and lifting attachments, bolt fixings, temporary supports and the like associated with the construction of the units.

D Any precast work damaged will be cut out and replaced, at the Contractor’s

expense. No patching will be allowed. RATES TO INCLUDE Testing of Materials E The costs of all preliminary and works tests required by the Project Manager to be

carried out on cement, water, aggregates, steel or any other materials for any reason shall be deemed to be included by the Contractor in his rates.

Formwork F Rates for centring and formwork are to include for all straight cutting and waster,

notchings, allowance for overlaps and passings at angles, horsing up, bolting, wedging, easing, striking and removing and, in the case of formwork described as wrot, shall in addition include for finishing the concrete perfectly smooth and true, slopping surface imperfections with cement and sand (1:1) and removing board marks and feathers.

Preparation of Surfaces (a) Earth and Rock G The preparation of all earth or rock foundation surfaces upon or against which

concrete is to be cast is to be to the satisfaction of the Project Manager and the coats thereof shall be deemed to be included by the Contractor in his rates.

(b) Existing Concrete H Any bonding of new concrete to existing shall be carried out as directed by the

Project Manager and the cost thereof shall be deemed to be included by the Contractor in his rates.

Precast Concrete A Rates for precise concrete are to be included for all necessary formwork and

mould, including wrot or lined formwork to exposed faces, stopping surface imperfections in cement and sand (1:1), rubbing off board marks and for all necessary light wire reinforcement to prevent damage or breakage in handling, casting in the requisite lengths, hoisting, bedding and building in composition or cement mortar and covering up protecting exposed surface and cleaning down at completion and making good.

Reinforcement B Reinforcement steel is measured in Bills of Quantities according to the calculated

weight as scheduled and the rates shall include for all cutting, bending, cranking, hooking at ends, hoisting, assembling, placing, fixing and maintaining in the correct position, for wastage and rolling margin and for all wire and other fixing devices employ.

C Rates for fabric reinforcement shall include for all banding, typing wire, distance

blocks and 300 mm side and end laps. Testing of Concrete D Any works cubes, or cores cut from the Works, which fail to meet the strength or

other requirements described herein shall be paid for by the Contractor. BRICKWORK AND BLOCKWORK 1.0 GENERAL 1.1 Codes of Practice

All brickwork and blockwork is to be carried out in accordance with the latest amendments of BS 5628 : Parts 1, 2 and 3 ‘Code of Practice for Use of Masonry’.

1.2 Mortar Testing

All test cubes shall be made and tested in accordance with the requirements of BS4551. The following table shows the required 7 and 28-day strength for preliminary and work tests:

MEAN COMPRESSIVE STRENGTH OF 100mm MORTAR CUBES IN N/mm²

Grade Mix 7 days 28 days 7 days 28 days (i) 1:0 to ¼:3 10.7 16.0 7.3 11.0 (ii) 1:½:4 to 4½ 4.3 6.5 3.0 4.5 (iii) 1:1:5 to 6 2.4 3.6 1.7 2.5 (iv) 1:2:8 to 9 1.0 1.5 0.7 1.0

1.3 Preliminary Test

Preliminary tests shall be carried out in ample time for the results to be approved before brick laying is due to commence, and before any change is made in the mortar mix, materials of source or materials.

The mortar shall be made in the laboratory from the materials and in the proportions proposed for use on site. Where colouring pigments are to be used, they must be incorporated in the mix.

Mixing, moulding and curing shall be in accordance with BS 4551. Three no. cubes shall be tested 7 days after casting and 3 No. after 28 days. If the cubes do not attain the strength specified, the Contractor shall obtain materials from other sources, or with different grading, and repeat at his own expense the preliminary tests.

1.4 Site Control Tests

Mortar shall be taken from the spot boards, and made into four 100mm mortar cubes for each 100m² of wall, or for every storey whichever is more frequent, for each designation of mortar used. 2 no. cubes shall be crushed at 7 days and 2 no. at 28 days, and shall attain the strengths specified in the Table above for site tests.

Compressive strengths: final acceptance of the work will depend on the 28-day cube strength and the 7-day tests should be regarded as a guide to strength development and an early indication of defective mortar. The Contractor shall keep a record of the positions from which test cubes have been taken.

In the event of 7-day strengths falling below those specified, the Contractor may elect to continue work at his own risk while awaiting the 28-day result, or immediately take down the work represented by the defective cubes.

Where either the 7-day or the 28-day strength falls below that specified, the

Contractor shall immediately investigate cause of the drop in strength, and take

steps to prevent further low results including, where necessary, a change in the

source of materials.

Work built with mortar represented by the defective cubes shall be liable to rejection by the Architect. The Architect's decision as to whether the work shall be retained or rejected shall be final, and the Contractor shall take down and re-build at his own expense the rejected work, together with any work which has to be removed to gain access.

2.0 MATERIALS 2.1 Bricks

Generally all bricks are to be the best of their respective kinds; hard, square cornered, sound and well burnt in accordance with the following:

a) Fired - clay bricks to BS 3921 b) Concrete bricks to BS 6073 Parts 1 & 2 c) Special bricks to BS 4729

2.2 Common Bricks

All common bricks shall have a minimum average crushing strength of not less than 20N/mm². All special bricks, i.e. squints, 'pistols', radials, etc are to be manufactured and not cut from rectangular bricks.

2.3 External Facing Bricks

Facing bricks to be specified by the Architect. 2.4 Blocks

Generally all blocks are to be the best of their respective kinds; hard, square cornered and sound, in accordance with the following:

a) Fired - clay blocks to BS 3921 b) Concrete blocks to BS 6073 Parts 1 and 2

2.5 Compressive Strength

All bricks and blocks shall have the required minimum compressive strengths as specified on the drawings. The Contractor shall satisfy himself throughout the period of delivery, that batches of bricks and blocks used have the required minimum crushing strength as shown on the drawings. The Contractor shall obtain reports or certificates of such test carried out by the brick or block suppliers and produce evidence to show that a regular, efficient method of quality control as referred to in BS 3921 is in use. The category of manufacturing control, i.e. Normal or Special as defined in BS 5628 : Part 1, shall be obtained from the manufacturer.

2.6 Delivery and Storage of Bricks and Blocks

All bricks and blocks shall be carefully unloaded and stacked. They shall be unloaded by hand or machine onto a reasonably dry and level site and not tipped from vehicles. In addition to this, common bricks are to be delivered to site in metal bands using the 'strapack' system of delivery and are to be off-loaded and placed in position of working before breaking the bands. Also particular attention must be paid to facing bricks and fair faced bricks and blocks, to preserve the arises and avoid face damage. All bricks and blocks must be protected from rain, snow and rising moisture. All bricks and blockwork are to be kept dry at all times.

2.7 Cement

The specification is the same as for FB1 cement, except that no PFA or GGBFS

shall be used. Masonry cement is to be to BS 5224, but shall not be used in load-

bearing walls.

2.8 Sand

In general the sand used in mortar shall comply with BS 1200 and be free from any deleterious substances. The use of sand which has been in contact with sea water shall not be permitted unless it has been washed adequately, so that the total quantity of soluble salts does not exceed 0.3%. The sand shall be stored away from other materials, where it will not become contaminated by deleterious matter, and extreme variations of moisture content shall be avoided.

2.9 Lime

The lime is to be hydrated and shall be hydraulic (calcium) lime or semi hydraulic lime to conform to BS 890 Class B, and a type deemed suitable by the Contractor. Lime shall be stored as cement.

2.10 Water

The water used for mixing shall be obtained from a statutory water undertaking, or shall satisfy the recommendations given in appendix of BS 3148. No sea water or water from excavations shall be used.

2.11 Admixtures

No admixtures will be permitted, however, a plasticizer conforming to BS 4887

may be used at the Contractors discretion. The use of calcium chloride will not be

permitted.

2.12 Pigments Any pigment used in mortar must conform to the requirements of BS 1014. Pigments containing 'carbon black' will not be permitted.

2.13 Mortar

Mortar shall consist of one of the following types of mix. The mixes to be used will be shown on the relevant drawings.

CEMENT:LIME: MASONRY CEMENT: CEMENT:SAND

SAND PLASTICIZER i) 1:0 to ¼:3 - - ii) 1:½:4 to 4½ 1:2½ to 3½ 1:3 to 4 iii) 1:1:5 to 6 1:4 to 5 1:5 to 6 iv) 1:2:8 to 9 1:5½ to 6½ 1:7 to 8

Where sulphate resisting cements are used, the mortar designations shall be prefixed 'S'. Ready mixed lime: sand for mortar is to be 1: 1: 5/6 range and shall be comply with the requirements of BS 4721.

Class i) Mortar to be used below dpc Class iii) Mortar to be used above dpc

2.14 Damp Proof Course

Damp Proof Course shall be specified by the Architect and shall be stored in accordance with the manufacturer's instructions.

2.15 Reinforcement Reinforcement where required in brickwork shall be Brickforce SBF60BSC manufactured by BRC (or similar approved). 2.16 Wall Ties & Anchors

All wall ties for cavity walls shall be in accordance with BS 1243. Metal ties for cavity wall construction shall be grade 18/8 austenitic stainless steel double triangle type or similar approved. The double triangle type of tie with the appropriate retaining washer shall be used for the support of cavity wall insulation, or similar approved.

Ties and anchors between brickwork and concrete shall be stainless steel butterfly

type cast into concrete as work proceeds, at specified spacing to suit brick / Block

coursing.

Ties and anchors between blockwork and concrete shall be 40mm x 5mm galvanised hoop iron, fixed into concrete as work proceeds at specified spacing to suit block coursing.

2.16 Joist Hangers, Holding Down Straps & Metal Fittings

Galvanised hot rolled strip used to provide stability between sections of walls, or between blockwork and the frame of a building, shall be in accordance with the requirements of EN2 (H.S.4B.) of BS 1449 : Part 1.

Joist hangers, wall and roof anchors, etc, shall be constructed from mild steel

grade 43A, or its equivalent, i.e. EN2 (H.S.4B.) of BS 1449 : Part 1 for hot rolled

strip. Joist hangers, and similar fabrication shall be galvanised after manufacture,

with a minimum costing weight of 610 grm/m² to BS 729. All other fittings shall

be galvanised to the above standard, or sheradized to BS 4921 Class 2 (minimum

local thickness 15 microns). All such angles are to be formed from grade 18/8

austenitic stainless steel plate or sheet.

All bolts, sockets and shims used to fix such angles to the structure shall also be grade 18/8 austenitic stainless steel.

2.17 Externally Exposed Supporting Angles Sealants used in brickwork joints shall be polysulphide stored in accordance with the manufacturer’s instructions.

2.18 Metal in Walls

All metal embedded in external solid walls or the outside skin of external cavity walls shall be grade 18/8 austenitic stainless steel.

3.0 WORKMANSHIP 3.1 Setting out Brickwork & Blockwork

Refer to the Architects drawings.

3.2 External Facing Bricks The Contractor is to allow in his prices for sorting and selecting facing bricks to

match the approved sample panel and carefully selecting for size for building pier,

projections and other sections of the work designed to brick modules or with tight

tolerances.

The colour and texture of bricks delivered shall be approved by the Architect.

In order to ensure a uniform appearance of facing brickwork, the Contractor shall agree with the Architect on the provision of a stockpile of facing bricks of sufficient quantity and access for selection, so that throughout the face brickwork programme thorough mixing and selecting from pallets is possible.

The Contractor's attention is drawn to the fact that a high standard of workmanship

will be required for facing work generally and particular care must be taken to keep such work free from mortar droppings and other staining.

3.3 Cavity Walls

All bricks used in cavity walls shall be whole bricks and no snapped headers are to be used except to maintain bond. Every care is to be taken to prevent mortar droppings from falling down the cavity, for example, by the use of laths that should be drawn up the cavity as work proceeds. Any mortar which may

unavoidably fall on the wall ties should be removed daily and temporary openings (coring holes or clean-outs) should be provided to permit the daily clearance of mortar droppings from the bottom of the cavity. Where coring holes are used, extreme care is to be taken to avoid any damage to the d.p.c.

In cavity walls the skins shall be tied together by wall ties embedded in the mortar, at the time the course is laid, with a minimum embedment into each leaf of 50mm. The ties shall not be placed at more than 450mm vertically (2 courses of blockwork maximum) or more than 900mm horizontally, staggered. Additional ties shall be provided near the sides of all openings, and at sides of all columns so that there is one for each 300mm of height, the ties being within 150mm of the openings or side column. At the edges of all panels, beams, etc, the first row of ties mustbe within 300mm of the edge. Wall ties shall be bedded with a slight fall to the outer skin.

3.4 Mortar

Mortar made on site must be mixed by machine, which must be cleaned before use to avoid contamination and must be cleaned out before changing mixes, and at the end of every working period.

All materials must be measured accurately by volume or weight, and not shovels. Powdered plasticizer must be dissolved in part of the mixing water before use.

Mortar should be used within 2 hours of the mixing of the cement and water, and any mortar not then used must be discarded and not re-tempered. This period of time may require reducing due to temperature and weather conditions.

3.5 Stability During Construction

During construction all walls shall be adequately restrained and laterally supported by Temporary supports able to resist forces as may be imposed by the wind and other loadings, until such time that the wall has been completed, achieved its full strength and is permanently restrained.

3.6 Bricklaying & Blocklaying

Unless otherwise specified by the Architect, the bonding of the brickwork shall be as follows:

Walls of one brick thickness and over - English Bond

Walls of half brick thickness - Stretcher Bond

Brickwork is to be constructed so that four courses equal a vertical dimension of 300mm and the bond is to be carried up regularly. No half bricks or bats are to be used except where required for the proper closures.

The rate of laying bricks must be such that it will prevent the squeezing of mortar joints. Blockwork is to be constructed such that the coursing coincides with the brickwork coursing where applicable.

Units should be laid in true and regular courses with adequate bond. All perpends

are to be truly kept and all joints properly flushed up or pointed as shown on the

drawings.

Pointing should be carried out from the top of the wall downwards, unless specified, as work proceeds. The work is to be carried up to even heights all round so far as is practicable and no part is to rise more than scaffold height (i.e. maximum 2m) above any adjoining brickwork. One skin of a cavity wall should never be more than 450mm higher than the other. The construction of any portion of the works shall not rise by more than 1.5 metres in any one day.

All brickwork and blockwork shall be laid on a full bed of mortar, and vertical joints shall be filled up. The cavity faces of blockwork and brickwork are to be 'flushed up' as work proceeds. The average thickness of the vertical and horizontal joints shall be 10mm, exclusive of any key in the jointing surfaces of the units.

Where bricks have 'frogs' they are to be laid with the 'frogs' facing upwards. Clay bricks having a suction rate greater than 1.5 kg/m²/minute shall be wetted so as not to exceed this figure at the time they are laid.

Before orders for the clay bricks are placed, the Contractor shall satisfy himself

that either that the suction rate of the brick does not exceed 1.5 kg/m²/minute or

that he is able to adjust it consistently so as not to exceed this value. The method

of testing will be as outlined in "The British Ceramic Research Association's

Special Publication No. 56".

Blockwork shall be laid strictly in accordance with the manufacturer's

recommendations, which may vary with weather conditions, temperature,

exposure, etc. Movement joints shall be formed where shown on the drawings in

accordance with the details given and care is to be taken to ensure that the gap is

free from debris. Brickwork and blockwork joints to be provided at not greater

than 12.0m and 6.0m respectively – joint location to be specified by Architect to

suit elevation treatments

All internal walls to be fully bonded/ toothed-in to external walls u.n.o. All internal and external masonry to be restrained a the head at not less than 600mm centres to the underside of the roof an/or floor construction, steelwork or suitably designed masonry restraints

No finishes or fixings shall be tied across movement joints. In addition, particular attention shall be paid to the manufacturer's recommendations for spacing and formation of contraction and expansion joints and in the reinforcement to prevent cracking around openings, joints in return walls and movement joints. Where the manufacturer's recommendations are not in accordance with the details, such variations shall be drawn to the Architect's attention.

All vertical loadbearing walls are to be built prior to the construction of the floor over. Non loadbearing walls shall not be completed until at least two weeks after any structural propping to the floor over is removed. Load bearing walls shall not be block bonded to non loadbearing walls. Internal non loadbearing walls shall not be block bonded to external cavity walls, but must be tied to provide the necessary restraint as specified. This also applies to any walls on separate foundations.

Where insitu finishes are to be applied to work other than faced work, the faces of all brick walls are to be prepared with an adequate key to receive plastering, rendering, etc.

Faced Brickwork and Blockwork In addition to the requirements for bricklaying and block laying, the following apply to Faced brickwork and blockwork. Facing bricks, bricks for fair faced brickwork and fair faced blocks are to be handled carefully on site to preserve the arises and to avoid damage. Units are to be carefully laid and faces kept free of mortar splashes and smears. The responsibility for protection of completed work is with the Contractor and polythene sheeting or similar covering must be arranged and the walls clearly labelled as finished work.

The Contractor is to provide a "Clipper" saw or similar machine for cutting all blocks for face work. Cut ends must be built it. In the construction of faced work:-

All bed joints are to be true and level.

All perpends to be kept true.

Units are to be laid to the bond as required by the Architect.

Gauge rods must be used for both horizontal and vertical coursing from datum.

Water content of mortar must be adjusted to avoid smearing on the face of any faced work and excess mortar is to be lifted away with the edge of the trowel.

"Making good" of faced work is impossible; therefore, the greatest accuracy must be exercised in cutting and boring holes for services. Intersections in fair faced work are to be butt jointed and tied together. Heads of walls shall be finished true and level. Faced work in course of erection must be adequately protected against rain and weather, and adjacent scaffold boards turned back at night.

3.8 Pointing

Fair faced brickwork internally is to be pointed with a neat flush joint as the work proceeds. The joints of all external facings are to be pointed with a bucket handle joint as the work proceeds. Fair faced blockwork internally is to be pointed with a bucket handle joint as the work proceeds.

3.9 Sample Panels

Sample panels for all faced work shall be built on site in a protected position before commencement of the works, to provide an agreed standard for the work and treatment of joints. Such panels shall be maintained throughout the contract and removed on completion.

3.10 Work in Cold Weather

Continuing Work The Contractor shall make every endeavour to continue working in cold weather which may be permitted by the Architect, providing the Contractor adopts the measures below to safeguard the work at all stages. The cost of these precautions shall be deemed to be included in the Contractor's tender.

Before the Contractor carries out any brickwork or blockwork at an air temperature of 4oC or below, he shall consider the recommendations in BS 5628: Part 1, The Structural Use of Masonry; the DOE Advisory Leaflet 8, "Bricklaying

in Cold Weather" and BDA Special Publication "Bricklaying under Winter Conditions".

Brick and block laying shall not be carried out when units are frozen nor shall mortar be mixed when sand is frozen.

When there is a risk of frost occurring, stacked bricks must not be wetted and in addition finished work shall be protected by sacking, tarpaulins, insulating quilts, windbreaks, braziers or otherwise. Any brickwork or blockwork damaged by frost shall be taken down and replaced by new work at the Contractor's own expense.

Suspending Work Should the Contractor not wish to adopt adequate measures to allow bricklaying and blocklaying to continue as outlined above, then no work shall be done if the air temperature falls below 4oC and continues to fall nor be commenced until the temperature has risen to 2oC and continues to rise.

3.11 Services Holes and Chases

The position of chases and holes shall be agreed between the Contractor and Architect/Engineer before work commences. Unless otherwise agreed with the Architect, the following conditions shall apply. 1. Depth of horizontal chases shall not exceed one-sixth of the thickness of the single leaf at any point in non loadbearing walls. 2. Horizontal chases will not be allowed in loadbearing walls. 3. Depth of vertical and diagonal chases (up to 30o from vertical) should not exceed one quarter of the thickness of the single leaf at any one point. 4. Where chases are necessary back to back, the total depths of the two chases must not exceed the depths shown above. 5. All chases shall be cut with a saw, and cut out cleanly without damage to the wall, and without over cutting. Reciprocating hammers of any type shall not be used. 6. Cutting of isolated holes may be permitted up to a maximum of 300mm square

to the Architect’s/Engineers approval. 7. No holes or chases shall be cut through walls within a line spreading at 45o from the bearing of a beam or other concentrated load, for a depth of 1.0m below the load.

In the event that the rules are not complied with, the remedial works shall be at the Contractor's expense.

3.12 Bearing of Lintels

Details of bearings for lintels and beams will be shown on the drawings. In the absence of specific information, the following rules shall be adopted:-

1. The minimum bearing for lintels onto brickwork shall be 150mm. 2. The minimum bearing for lintels onto blockwork shall be 300mm. 3. Lintels shall bear on whole blocks not cut blocks. 4. Lintels are to be bedded in mortar similar to that used for laying the

units. 3.13 Fixing of Brick Support Angles

After slabs and edge beams have been cast and formwork props removed, the

Contractor is to accurately survey the positions of the cast in sockets. He is then

to make templates from the results of his survey to enable holes to be accurately

drilled in the stainless steel angles. The enlargement of holes in the angles will not

be permitted.

The Contractor is to allow in his tender for providing stainless steel shims to fill gaps between the angles and edge beam caused by tolerances in the position of the edge beam or the cast in sockets protruding from face of the beams. The depth of the shim is to be the full depth of the angle.

3.14 Damp Proof Course The damp proof course shall be laid in accordance with the requirements of SP56 – Model Specification for Clay and Calcium Silicate Structural Brickwork (BCRA). 3.15 Fixing Cavity Wall Insulation

Cavity wall insulation shall be fixed in accordance with the manufacturer's

instructions. Damaged boards shall not be used and the cavity shall not be bridged

by the insulation.

The Contractor shall provide facilities free of charge for the Architect or Clerk of Works periodically to satisfy themselves that all precautions are being taken to ensure that the cavity is not bridged. Notwithstanding the foregoing item no claim by the Contractor will be admitted by the Architect should it be necessary to carry out remedial works as a result of bridging the cavity.

TABLE 1 - SPACING OF WALL TIES

Cavity Width Horizontally Vertically

50 - 75 mm 900 mm 450 mm

75 - 100 mm 750 mm 450 mm

100 - 150 mm 450 mm 450 mm

Openings Maximum 150 mm from reveal 225 mm

Note : Wall ties are to be evenly spaced and staggered.

TABLE 2A - MORTAR MIXES (LOCATION) MORTAR GROUP

Type of Weather Type of No risk of Frost may Construction Exposure Bricks or Blocks frost during occur during

construction construction

Loadbearing, Any Clay (DPC class A or 1

engineering B)

Retaining walls Any Clay (Class A or B) 1 or 2

Sills & Copings Any Clay (generally class A 1 or 2

or B)

Parapet walls Any Clay (with low sulphate 3 5

(rendered) content)

Parapets (not Any Clay (with low sulphate 1, 2 or 3

rendered) external content)

freestanding walls,

work below dpc

External walls Severe exposure Clay 3

between eaves and

DPC

External walls Sheltered or Clay 3

between eaves and moderate

DPC exposure 4 5 Backing to external ------ Clay 3

solid walls 4 5 Inner leaf of cavity ------

Clay or concrete block 3 3

walls

Inner walls ------ Clay or concrete block 4 or 6 3

TABLE 2B - MORTAR MIXES (COMPOSITION OF INGREDIENTS)

Mortar Group Hydraulic Lime:Sand Cement Lime:Sand Cement Sand with

Plasticiser

1 ---- 1:0 - 3 : 3 ----

2 ---- 1:2:4-42 ----

3 ---- 1:1:5-6 1:5-6

4 1:2-3 1:2:8-9 1:7-8

1:2:8-9 5 ---- with plasticiser to 1:7-8

entrain 8 to 12% air

6 1:3 1:3:10-12 1:8

1.1.a.i.1.1.1.1.1 Samples of blocks

A The Contractor is to include for submitting samples of blocks to be used in the

Works to the Supervising Officer for approval before the blocks are delivered to the site, and all subsequent deliveries must conform to the approved samples.

Mortar B The nominal mix proportions are given below. Proportions shall be adjusted

as necessary to meet strength requirements. C Mortar for blockwork below ground floor level, manholes,etc. and for external

pointing shall be composed of one part cement, and four parts sand by volume. D Mortar for blockwork above ground floor level shall be composed of one part

cement, one part lime and six parts sand by volume.

E Composition mortar is to be mixed at least seven days before being required and kept damp with wet sacking. Immediately before use the cement is to be added with sufficient water to provide a proper consistency and any such mortar which has been mixed for more than one hour shall not be used on the Works.

A The proportions shall be measured in approved gauge boxes. The mortar shall

be mixed in an approved mixer or by hand on a clean, close-jointed timber or metal mixing platform.

B If the mortar is mixed by hand, the materials shall be turned three times dry or

until the mixture is of an even colour throughout and turned three times wet. All mortar shall be prepared in sufficient quantity for immediate use only. No mortar shall be re-tempered for re-use after it has taken initial set.

Damp proof courses

C The damp-proof courses are to be formed of one layer of three ply bituminous

felt sheeting laid on a level bed of mortar under walls. The sheeting is to be slightly wider than the walls in which they are laid and laps at ends, etc. are to be not less than 150 mm or the thickness of the wall in the case of angles and intersections and thoroughly bedded in mastic.

D Rolls of damp-proof course shall be stored on a level surface away from heat,

in such a manner as to prevent damage by squashing and generally in accordance with the manufacturer's instructions

Blockwork

E All blocks must be properly stacked on the site and are to be carefully handled.

Dumping or tipping of blocks will not be allowed. F All blockwork is to be accurately set out horizontally and all vertical planes,

quoins, jambs and reveals kept perfectly plumb. Course heights are to be agreed with the Supervising Officer prior to commencing construction and proper gauge rods shall be used.

G All blocks are to be well wetted before being laid and any blockwork not so

wetted must be pulled down and re-built in a proper manner. Tops of all walls and rackings are to be covered over and protected when work is stopped for the day and are to be well wetted before work is recommenced.

H All blockwork is to be solidly and evenly built with all joints well flushed up

with mortar as the work proceeds and well grouted at every course solid throughout the width of the wall with proper perpends kept. Mortar joints shall be 10mm.

I The bond is to be stretcher bond. J All the walls are to be built up in uniform stages and no part is to be carried up

more than one metre above any other part at a time. K No false headers or half bats are to be used except where legitimately required

for bonding. L The joints of all walls to be plastered, rendered or screeded, etc. are to be well

raked out as the work proceeds to provide a key. M The prices for blockwork shall include for all plumbing of angles.

Building in pressed metal windows and door frames A Rates for building in pressed metal windows and door frames shall include for

assembling all parts and fixing in accordance with the manufacturer's instructions including setting perfectly plumb and free from the slightest distortion and for cutting, pinning or building in lugs to blockwork or plugging and screwing to concrete, bedding and filling frames solid in cement mortar (1:4) and pointing in mastic, easing and adjusting windows, oiling hinges and fastenings and leaving in perfect working order on completion.

Building in timber windows, door frames and entrance screens B Rates for building in timber windows, door frames and entrance screens are to

include for setting and maintaining frames and screens perfectly plumb and free from the slightest distortion, cutting and pinning cramps to brickwork, setting and fixing dowels in mortices and for protecting from damage and all substances likely to cause stains.

ROOFING

Chromadek IBR Roof Sheets C Chromadek IBR Roof Sheets will be used. The sheets are to be laid strictly in

accordance with instructions and specifications. The Contractors shall ensure that at all times, whether during the period that the sheets are being transported or during the period of storage at the site or after fixing that the sheets are adequately protected from damage.

Ridge and Hip Capping D The ridge and hip capping shall be the standard angle pattern concrete capping

recommended be the manufacturers and shall be bedded and pointed in cement and sand mortar (1:3)

Valley Gutters E The valley gutters shall be constructed from 0.60 mm thick (24 gauge)

galvanized sheet steel bent to profile with 150 mm laps and fixed to softwood. Rates F Rates are to include for laps, dressings, bends, welds, welts and turning and

wedging into grooves all in accordance with the manufacturer’s instructions. CARPENTRY, JOINERY AND IRON MONGERY TIMBER Generally A All timber shall be sound, thoroughly seasoned, free from sap, shakes, loose or

dead knots, wane edges, insect attack, warps or twists or other defects within the limits contained in the relevant British Standard as hereafter specified.

Softwood B The softwood for structural carpentry work shall be equal to B.S. 4978 Grade

SS. C The softwood for non-structural carpentry work shall be equal to B.S. 4978

Grade SS. D The timber may be:-

(1) Imported best quality kiln seasoned softwood. (2) Local softwood of cypress, pine or cedar, properly air or kiln seasoned

and free from warp, twist or rot. Softwood with the following defects will be acceptable provided the defects do not extend beyond the limits specified:-

(a) Splints and cracks shall not be extended for more than one third of the width or thickness, or for more than one length of the length of the timber.

(b) Wane shall not extend for more than one fifth of the length or

timber and be one edge only.

(c) The diameter of knot shall not exceed one third of the width of the face of the timber on which it occurs.

E The moisture content at time of fixing shall be not more than 20 per cent or

less than 15 per cent of the dry weight. F The softwood for joinery work shall be kiln dried and specially selected for

clearness and uniformity of grain and colour and shall be to B.S. 1186 part 1 Class 2 in respect of joinery work finished with paint or other opaque finish and Class 1 S in respect of joinery work selected for clear finish.

Hardwood G The hardwood timbers are to be B.S. 1186 Part 1 Class 1 S and shall be

selected Mlombwa or other equal and approved, selected, straight, close grained hardwood equal to sample to be approved.

LAMINATED SOFTWOOD A The laminated softwood shall be obtained from International Timber Ltd

(formerly called Imperial Timber Ltd), P.O. Box 5050, Limber or other equal and approved.

B The rarabers shall be to S.A.B.S. 876 and 1089 and adhesives are to be phenol

resorcinol to B.S. 1204, Type WBP and S.A.B.S. 1349, exposure Class 1. C The members are to be supplied sanded, with an application of water repellent

and are to be free from warps and twists, cracks, waney edges insect attached and all other defects.

SOFTBOARD D Softboard shall be “Celotex” or other equal and approved to B.S. 1142 Part 3. E Ceiling boards shall have splayed edges all round and shall be fixed to

brandering with close butted joints. Boards shall be close nails with galvanized

clout nails and shall be set out with equal margins on opposite sides of rooms and symmetrical and regular joints.

F Cracked or broken boards, those showing evidence of insect attack or any

other defect shall not be used in the Works. PLYWOOD G Plywood shall be to B.S. 1455 Grade 1 veneer for polishing or Grade 2 veneer

for painting, manufactured from kiln dried Tola or other equal and approved and covered on both sides with hardwood venner as specified. Both faces are to have a fine sanded finish and shall be free from knowts, splits, dots, glue stains, filling or inlay of any kind, lifting at edge, blistering, surface cracks inset attach and all other defects. No patches or plugs will be permitted.

H Bonding between veneers shall be type WBP or Type INT for exterior or

interior use respectively as specified. BLOCKBOARD I All block board shall be to B.S. 3444 Grade 1 veneer for polishing or Grade 2

veneer for painting and shall be obtained from an approved manufacturer. J Kiln dried Tola or other timber of equal and approved quality shall be used for

the construction of block except where described as being veneered with hardwood which shall be as previously described.

K Bonding between veneers and the core shall be Type BR or Type INT for

exterior use respectively as specified. L Both faces of all block board shall have a fine sanded finish and shall be free

from knots, splits, dote, glue stains. Lifting at edges, blistering, insect attach, sinking or raising of the surface due to faults in the base material and all other defects. No patches or plugs will be permitted.

FLUSH DOORS A All flush doors are to be B.S. 459 Part 2 of the finished thickness stated, of the

best quality obtained from an approved source, of an approved semi-solid core construction with egg orate filling, covered on both sides with 4 mm plywood as described suitable for painting and with hardwood lip pings tongued and grooved to both stiles. All timber is to be kiln dried and all glued together under pressure with an approved synthetic resin, water insoluble, cold setting adhesive.

PLASTIC VENEER

B The plastic veneer shall be 1.5 mm “Formica” or other equal and approved cigarette proof single-surface decorative laminated plastic with sanded back and shall be fixed with approved contact adhesive suitable to the backing used strictly in accordance with the manufacturer’s instructions.

C The colours and patterns of the veneers are to be in accordance with samples

to be submitted to and approved by, the Project Manager. SIZE OF TIMBER D All timbers are to sawn die square and are to held full specified sizes when

sawn. SIZE OF TIMBER E An allowance from the sizes stated not exceeding 3 mm will be permitted for

each wrot face, except to timber not exceeding 1250 square millimetres cross-sectional area which must hold up to the full size specified.

RATES TO INCLUDE F Rates for structural timbers described as “sawn” shall include for all

workmanship and labour in preparing and connecting together by lapping, notching, splay or bird’s mouth cutting, halving and for all nails and spikes. Rates for non-structural timbers described as “sawn” shall in additional include for dovetailed and scarfed joints and for wrot faces to exposed ends.

G Rates for work described as “framed” shall include for workmanship and

labour in connecting by mortice and tenon and dovetailing, housing, tonguing and grooving and the like and for all nails.

H Rates “wrot” woodwork shall include for the foregoing arise rounded corners

to salient angles and in addition include for short lengths, mitres and returned, scribed, housed and fitting ends.

I Rates for doors shall include for hanging on butts, trimming and easing over

floor finish, priming and undercoating the top and bottom edges prior to fixing and filling, stopping and rubbing down the surface of plywood to a perfectly smooth finish to receive decoration.

RATES TO INCLUDE (cont’d) A When timber members are described as being screwed and pelleted, the

contractor is to include in his rates for letting in heads of screws and pelleting with matching timber glued and correctly grained.

WORKMANSHIP B All joiner’s shall be in accordance with B.S. 1186 Part 2 and shall be worked

exactly to detailed drawings and prepared and loosely framed together as soon as possible after commencement of the Contract and taken apart and stacked until required for fixing. All joints to external work shall be glued, all joints and wedges to external work shall be thoroughly painted with priming paint or water insoluble glue, all mortise and tenoned joints shall be wedged and dowelled, all joints shall be tight fitting, all surface to be painted shall be finished with a fine glass papered surface free from machine or tool marks and all nails and springs shall be punched and filled before work is painted. All surface to be polished shall be finished with a smoothing plane, all arises shall be slightly rounded and any work in which the joints shall have opened or other defects shall be occurred during the Defects liability Period shall be reinstated and all work disturbed made good at

WORKMANSHIP the Contractor’s expense to the satisfaction of the Project Manager. Clearance

to doors when hung shall be 3 mm at top and sides and 6 mm at bottom. C Where timber members are specified as being plugged, the contractor is to

form neat mortises of the required depth and plug with “raw plugs” or other approved filling in accordance with best practice.

IRONMONGERY D Ironmongery not specified hereafter by reference to manufacturer’s catalogue

shall be in accordance with B.S. 455, 1331 and 1494 as applicable. E All locks are to be supplied with two keys stamped with numbers

corresponding with the number stamped on the fore end of the lock and handed to the Project Manager with identification labels attached.

F Rates are to include for submitting a sample of all ironmongery to the Architect

/ Supervising Office for approval before ordering, for carefully wrapping and protecting until completion and replacing any damaged or defaced items with new or repairing and reacquiring at the Contractor’s expense as instructed by the Project Manager for fixing with and including suitable screws to match the metal and for oiling and leaving in perfect working order at completion.

G Louver clips where specified shall be level operated, of natural finish

aluminium set perfect alignment and fixed to timber frames with matching screws.

H Where ironmongery is described as fixed to metal the contractor is to include

in his rates for drilling and fixing with matching self-tapping screws.

METALWORK WILD STEEL A All steel and steelwork is to be of approved manufactured and shall comply in

all respects with B.S. 4, 449, 1775, 2994, 4360 and 4848 as applicable. B Bolts and the use thereof shall comply in all respects with B.S. 325, 916, 1083,

1494, 1768, 1769, 2708, 3139, 3294, 3692, 4186, 4190, 4395, 4604 and 4933 as applicable.

WELDING C All welding is to comply with the relevant British Standard where applicable

and electrodes to B.S. 639 and 4215. Welding is to be carried out by skilled operators in accordance with the principles set out in the British Standard Code of Practice CP 3012.

D All welding is to be left in its original state and neatly finished off and polished

after examination by the Project Manager. All connections are to be capable of transferring a load of ten per cent more than the members connected.

E All members are to be in one length and butt welding will only be allowed with

the Project Manager’s approval. GENERALLY F The details of construction may be decided by the Contractor to suit his

methods of manufacture subject to the Project Manager’s approval. G All steelwork is to be erected in its correct position, accurately levelled, lined

and plumb. PRESSED METAL WINDOWS H The pressed metal windows are to be cottage section to B.S. 990 with an

approved rust proof finish, similar to that specified or obtained from B. and C. Metal Products Ltd., P.O. Box 52, Blantyre, or other equal and approved manufacturer and complete with all necessary fixing lugs. Opening lights to metal windows are to be provided with friction stays or roto operators, matching ironmongery, hinges and fasteners of a type to be approved by the Project Manager.

PRESSED METAL DOOR FRAMES

I The pressed metal door frames are to be similar to that specified or obtained from B. and C. metal Products Ltd., P.O. Box 52, Blantyre or other equal and approved manufacturer. Frames are to have an approved rust proof finish. Frames are to be provided with lock striking plates, rubbers, loose hinges and pins, stay bars to feet and fixing lugs.

PLUMBING GALVANIZED SHEET STEEL A All sheet is to be galvanized of an approved brand and of the gauge specified. B Rates are to include for clips, welted edges, wedging and fixing. U.P.V.C. GUTTERS, RAINWATER PIPES, FITTING AND FIXING C The U.P.V.C. gutters, pipes and fittings are to be to B.S. 4514 and shall be

obtained from a manufacturer approved by the Project Manager. D The pipes and fittings shall be jointed in accordance with the manufacturer’s

instructions. E Rates for eaves gutters shall include for fixing on purpose made bolted brackets

to falls. U.P.V.C. SOIL, WASTE AND VENTILATING PIPES, FITTINGS AND

FIXING F Rates for rainwater pipes are to include for temporary supporting the pipes in

position while the mortar packing is placed around and for all loose pipe sockets, double sockets, straight couplings, union couplings, expansion couplings, short lengths and for forming all joints and cutting and waste and all necessary jointing materials. All other fittings are measured and rates shall include for extra joints.

G The U.P.V.C. pipes and fittings are to be to B.S. 4514 and shall be obtained

from a manufacturer approved by the Project Manager. H The pipes and fittings shall be jointed and fixed in accordance with the

manufacturer’s instructions. Vertical and horizontal pipe runs shall be supported and fixed with clips drilled, plugged and screwed to walls and soffits and where necessary suitable hanges shall be provided.

I All branch connections to main soil, waste and ventilating pipes shall be swept

in the direction of flow, and pitches tees only shall be used. J Generally, soil pipes where “horizontal” shall fall at 2.50 % towards the main

vertical pipes, “horizontal” waste pipes shall fail at 1.50 % towards the main vertical pipes and “horizontal” ventilating pipes shall rise at 1.50 % away from the traps they serve.

K Expansion joint couplings shall be fixed in pipe runs at intervals in accordance

with the manufacturer’s instructions.

L Rates for pipes are to include for fixing with all necessary clips, holder bats and

hangers and drilling, plugging and screwing or cutting and pinning to walls and soffits and for making good the finishings to surfaces to which the pipes are fixed and for all loose pipe sockets, double sockets, straight couplings, union couplings, expansion couplings, short lengths and for forming all joints and cutting and waste and all necessary jointing materials. Allotter fittings are measured and rates shall include for extra joints.

MEDIUM DUTY GALVANIZED STEEL TIBING, FITTINGS AND

FIXING A The galvanized steel tubing is to be medium weight in accordance with B.S.

1387 and joints are to be screwed with red lead and hemp. B Fittings are to be galvanized wrought steel to B.S. 1740. All bends in any pipe

run. C Long and short nipples shall be used as required, running nipples will not be

permitted. Unions shall be used at the final connection to all fittings, after all valves and on vertical pipe runs in ducts at each floor level. They shall be of the types having galvanized malleable cast iron bodies with ground spherical or taper gunmetal seating faces.

D All screwed tubing and fittings shall be connected by means of joints having

taper or taper threads complying with B.S. 21. Prior to making and joint the male end of the connection shall be coated with “Boss White” as manufacturer by Crane Ltd. Or other equal and approved compound.

E Welding of galvanized tubing will not be permitted. No joints shall be made

within an unobstructed distance of 600 mm of any electrical cable, conduit or component, nor shall any joints be formed with the thickness of any wall, slab, etc.

F Rates are to include for fixing pipes with approved pipe clips or galvanized

holder bats including cutting and pining and making good the finishing’s to the surfaces to which the pipes are fixed.

G Rates for tubing of 20 mm diameter and less are to include for all labour to

bent pipes and fittings such as bends, elbows, tees, crosses, connectors, nipples, sockets, unions, reducing sockets, backets, backnuts, plugs and the like and for all short lengths and cutting and waste.

H Rates for tubing exceeding 20 mm diameter shall include for all paralled

sockets, nipples, unions and for all short running lengths and cutting and waste.

All other fittings and labours are measured and the rats for fittings shall include for extra red lead joints.

PIPE WORK GENERALLY I All internal pipe work shall be executive in collaboration with the work of any

specialist employed for electrical work, etc. So that all trade provide a neat and workmanlike finish.

J Cutting of holes, chases, etc, through reinforced concrete shall be carried out

only with the writing authority of the written of the Project Manager and all holes, chases, etc. shall be properly made good on completion.

K plumbing work shall be carried out strictly in accordance with the plumbing

and drainage plans and details and written authority shall be obtained from the Project Manager before any change or variation from the plan is made.

L Pipes shall be arranged and fixed in a neat workmanlike manner, straight,

parallel in line and with the fittings set true and plumb. PIPE WORK GENERALLY A Exposed pipe shall be so fixed that there will be not less than 25 mm clear

space everywhere between the pipes or pipe fittings and the finished wall, ceiling or beam face. Where such a clearance does not appear to be practicable or workmanlike, the Project Manager shall be consulted before fixing the piping and his written approval obtained. Access plates and fittings shall be used only where shown on the drawings.

PIPEWORK GENERALLY (cont’d) B All service and distribution pipe runs shall be set out and fixed to avoid traps

and air locks, and branches taken from vertical pipes shall have a constant slight rise or fall as the case may require for the release of air and the enable the free end of all overflow pipes.

C pipe-work of unlike materials shall be joint an approval manner in accordance

with the best standard practice. BRASS WORK AND SUNDRIES D All taps, valves, traps, etc. shall comply with the type and B.S. specified and to

any requirements of the Local authority. Samples of taps, valves etc. are to be submitted to the Project Manager before fixing.

E Taps shall be marked with an approved colour or letter identification. Cold

water taps shall in every case be fixed at the right hand side of sanitary fitments.

F All ball valves shall comply with B.S. 1212 and shall be of the sized and for the

pressure indicated or directed. The loose orifice seats shall be of nylon for sizes 13 mm and 19 mm and bronze for sizes 25 mm, 38 mm and 51 mm. Ball valves shall be supplied and fixed complete with copper floats to B.S. 1968 or with plastic floats not less robust and having lifting effort not less than a B.S. 1968 copper float for the same duty.

G Rates for taps, valves, traps, etc. are to include for jointing to pipes including

making joints and any necessary connectors to suit the particular type of pipe to which they are fitted and for supplying samples and for providing and handling to the Project Manager here valve keys for each type and size of gate valve installed in the Works.

SANITARY FITTINGS H sanitary fittings not specified reference to manufacturer’s catalogues shall be in

accordance with B.S. 1125, 1188, 1189, 1206, 1213, 1244, 1254, 3380 (Part 1) and 3402 as applicable.

FIRE FIGHTING EQUIPMENT I The fire fighting equipment shall be of the type specified and shall be

guaranteed by the manufacturer. J Rates shall include for fixing complete including drilling, plugging and screwing

or bolting brackets to walls. PIPE SLEEVES A All pipes shall be sleeved where passing through concrete roofs, suspended

floors and where directed through walls. Sleeves shall be of galvanized mild steel tubes and such bore as to provide an annular space not less than 3 mm wide at any point. They shall project 40 mm above roof level but in all other cases shall finish flush with finished surfaces. The annular space shall be caulked with lead wool and approved wall plates shall be fixed where directed.

MARKING OF PIPES AND VALVES B The Contractor is to include in his rates for providing aluminium identification

labels wired on to all valves and for making and labelling all exposed pipes to indicate the paid identification colour in accordance with B.S. 1710 and at completion of the Works, for providing the Project Manager with a valve chart and “as fixed” drawings indicating the valve number, position and purpose of each respective valve.

MARKING OF PIPES AND VALVES

C The Contractor is to include on his rates for painting identification colour

bands 300 mm wide on all concealed pipe work in accordance with B.S. 1710 at access points.

MARKING OF PIPES AND VALVES D The Contractor is to include in his rates for painting pipe work for painting all

brackets, pipes clips, holder bats, hanges, etc. and for painting in all various identification colours in accordance with B.S. 1710.

TESTING OF PIPES E All pipelines shall be hydraulically tested after laying to pressure equal to the

maximum working pressure plus at least 50 per cent in accordance with Clause 602 of C.P. 310 (1962). The test pressure shall be maintained for a period of thirty minutes without measurable loss. Pipelines shall be tested in sections by closing off at stop valves or by inserting temporary stop ends. Each class of pipe shall be tested separately. The pipelines shall be tested in lengths as approved by the Project Manager.

F As soon as a length of pipeline of the same class of pipe not exceeding 1000

metres or the distance between successive valves on each class of pipeline, whichever is the lesser, is laid and jointed, the pipeline shall be tested before further pipe laying and joint proceeds unless otherwise approved by the Project Manager. The Contractor shall supply, fix, strut and secure all temporary stop ends for testing purpose and the costs there of shall be deemed to be included in the costs for testing. In the event of a fault or suspected fault occurring subsequent to testing a pipeline, the Project Manager may require at further test and this shall be carried out the Contractor without extra payment. The cost of testing shall be included in the various rates for laying pipes. Immediately a section has been passed by the Project Manager is shall be backfilled to avoid subsequent damage.

J The position of the pressure gauge for recording the test pressure shall be at a

point in the section being tested where the working pressure is greatest. STRUCTURAL STEELWORK 6.01 Specification for Structural Steelwork 6.01.1 Scope of Section This section covers building frames and other similar steelwork including anchorages and foundation bolts. 6.02 Materials Materials shall comply with the appropriate British standards listed below BS 4-1 Structural steel sections – specification for Hot rolled sections

BS EN 10210 Hot rolled structural steel sections. Part 2 – structural hollow sections and BS EN 10056-1:1999 Equal and unequal angles

BS EN 10296 Specification for seamless and welded steel tubes for automobile, mechanical and general engineering purposes.

BS EN 10149-2 & 3 Steel plate, sheet and strip. Part 1 – carbon steel plate sheet and strip BS 3692 ISO metric precision hexagon bolts, screws and nuts BS 4190 ISO metric black hexagon bolts, screws and nuts BS 4320 Metal washers for general engineering purposes BS 7668 Weldable structural steels BS 4933 ISO metric black cup and counter sunk head bolts and screws

with hexagon nuts. 6.03 Design of Connections The main dimensions of the structures and the sizes of members are shown on the drawings. Bolts shall comply with BS 3692 or 4190 and shall be of strength and grade as shown on the drawings. Washers complying with BS 4320 used with such bolts shall be tapered or flat as appropriate to ensure full bearing for the units and the bolt heads. All bolts in any one connection shall be of the same diameter and all bolts used on site shall be of the same strength grade unless otherwise specified or approved by the Supervisor’s representative. 6.04 Submissions to the Supervisor’s representative 6.04.01 Submissions Before fabrication The contractor shall submit to the Supervisor’s representative two copies of each of the following: a) details of orders for materials and fabricated steelwork; b) details of proposed source of supply of steel and dates of rollings; c) details of proposed programme, sequence and methods of fabrication; d) details of proposed programme; sequence and method or erection with any

supporting calculations and details of constructional plant; e) if it is proposed to use high strength friction grip bolts with load indicating

devices, details of the manufacturer’s recommendations regarding their use; f) outline details of materials and methods of application proposed to meet the

specified requirements for protective coatings both in the shop and, if required, on site in compliance with “Specifications for protective coatings”.

g) Description and samples of all proprietary products which the Contractor proposes to use in the Permanent works”

Contractor’s fabrication drawings (if applicable) The contractor shall supply to the Supervisor’s representative four printed copies and one reproducible copy of the drawings approved by the Supervisor’s representative

and four copies or the specifications and other information’s approved by the Supervisor’s representative. Fabrication shall not be started until the Supervisor’s representative has approved the relevant shop drawings and once such approval has been given no alterations shall be made to the shop drawings without the further approval of the Supervisor’s representative. 6.05 Fabrication

6.05.01 Material Steel shall be Grade 43A to BS 7668 unless otherwise indicated on the drawings. Crane rails shall comply with BS 11 normal steel grade. 6.05.02 Workmanship Steelwork shall be fabricated to comply with BS 5950 – Part 2 and with the following further requirements: a) All members shall be accurately cut square or to the required angle and neatly

dressed. b) Flanges shall be neatly cut away or notched where required. Notches shall be as

small as possible with radii in the inner corners. c) Sheared or cropped edges shall be dressed to a neat finish with sharp edges

removed and shall be free from distortion. d) Flame cut edges shall be dressed to give a smooth and uniform surface. All

edges shall present a smooth surface. e) All holes shall be drilled and de-burred. f) Bearing stiffeners shall be ground to fit accurately and shall be in contact over

90% of the stiffener area unless welds are provided, designed to transmit the full reaction of the load between stiffener and flange.

g) Butt joints transmitting compressive stresses in bearing shall be in contact over an area not less than 75% of the abutting faces, the contact area being generally symmetrical about major and minor axes.

All surfaces for protective coatings shall be in accordance with the requirement of “specifications for protective coatings”. 6.05.03 Welding Welding fabrication shall be carried out by metal arc welding. All welding procedures, weld testing and proficiency testing of welders shall comply with the appropriate British Standards listed below for the grades and thicknesses of steel and the types of weld specified: BS EN 499 Covered electrodes for manual metal arc welding of mild

steel and medium tensile steel BS EN 1435 Methods of radiographic examination of fusion welded butt

joints in steel BS EN 1714 Methods for ultrasonic examination of welds Part 1 –

Manual examination of fusion welds in ferritic steel

BS EN 756 BS EN 760 Electrode wires and fluxes for the submerged arc welding of mild steel and medium tensile steel

BS EN ISO 15614-1 + A1 Welding Specification and welding procedures for metallic materials procedure test

BS EN 287-1 Qualification test of welders – Fusion welding of steel BS 4872-1 Specifications for approval of testing of welders when

welding procedure approval is not required – Fusion welding of steel

BS EN 1011-1:1998, 2 Metal arc welding of carbon and carbon mangenesse steels BS EN 970 Visual inspection of fusion welded joints. Only certificated welders tested and certified by an Authority acceptable to the Supervisor’s representative shall be employed in fabricating the Permanent Works. The Contractor shall arrange for such certification and testing. The sequence of welding operations shall be arranged to minimise distortions and residual stress during fabrication and in the structure after erection. Welds and weld finishes shall be carried out by the contractor and such testing shall comply with the requirements of the appropriate British Standards where applicable. Preheating of members before the welding shall be carried out in accordance with BS EN 1011-1. 6.05.04 Weld Preparation All parts to be welded at an angle (fillet weld) must be approached up to where feasible and in no case, shall the separation of such parts be larger than 3mm.; if the separation is of 1.5mm. or larger, the weld size shall be increased in the millimeters which the separation measures. The separation between surfaces to be welded, when the joint is by lapping, shall not be larger than 1.5 mm. The parts to be butt welded shall be carefully aligned. As long as feasible, the element shall be placed in position for flat welding. Upon assembling and joining the parts of a structure or combined pieces, the procedure and sequence of welding shall be such as to minimize distortion and residual stresses. 6.05.05 Butt welding All butt welds shall be continuous and of complete full penetration with cross-section not less than the next area of the section joined. When the thickness of elements to be joined is equal to or less than 6 mm. butt welding from a single side shall be allowed, without the need of edge preparation as long as an electrode is used which ensures complete penetration. The separation between edges in this case shall be less than half the thickness of the thinnest piece to be welded.

When the thickness of pieces to be joined is more than 8 mm., edges shall be prepared for Vee or double-Vee joint, depending on whether both sides are accessible or not. In any of the two cases, the separation between edges shall not exceed 3 mm. In double-Vee joints, cleaning of the root shall be systematically carried out by mechanical or by arc-air procedures, before starting welding on the opposite side. When the need is specified for using back-up ring or backing plate, the material used must be of the same nature as the base material and the weld variables shall be such as to ensure a perfect fusion of the three elements which appear in the connection. Special care shall be taken in order to avoid corrosion traps. When for the fill of joints it is necessary to deposit several beads, each one of them must be cleaned of slag before proceeding to deposit the next one. This operation can be performed with mechanical grinder or welder's pick. When carrying out this operation, the best practices of the profession must be used. The last bead shall be sufficiently wide for the weld surface to be smooth. 6.05.06 Fillet welds Fillet weld sizes shall be as indicated on the drawings. If required, the welds of several layers may be hit with a mechanical chipper, of oblong shape and round peen. The hits shall be done after weld cooling at a warm temperature felt by hand. Care shall be taken that no weld nor base metal suffer inlaying, detachments or deformations as a consequence of the hammering. 6.05.07 Correction of distortion Any distortion over the allowable tolerances specified in Clause 6.5.9and those pointed out by the Supervisor’s representative shall be corrected so as not to impair the quality of materials. Preheating of members before the welding shall be carried out in accordance with BS EN 1011-1:1998; BS EN 1011-2:2001. 6.05.08 Bolts

Bolt holes shall be accurately aligned so that bolts can be inserted without force. Bolts shall not be driven home and drift pins used to draw members into alignment shall not be used in a manner to distort or enlarge bolt holes. Bolts shall be of sufficient length to show at least two clear threads beyond the nut when fully tightened. When bolts are used in bearing, members shall not bear on the threaded part. Where physically possible bolts shall be fitted “nuts downwards”. Joint interfaces shall be clean and free from loose scale, loose rust, oil, grease, paint and all other deleterious matter before the joint is assembled.

6.05.09 Fabrication and Erection Tolerances Members shall comply with the dimensions and shapes shown on the drawings within the tolerances set out below: a) Length – plus or minus 2.0mm b) Width and depth – plus or minus 3.0mm. c) Straightness

i) Compression Members – a compression member shall not deviate from straightness by more than 1/1000 of the axial length between the restraint points.

ii) Other members shall not deviate from straightness by more than 1/1000 of the axial length

b) No part of the machined bearing face of a column shall deviate from a plane at right angles to the axis of the column by more than 0.25mm per metre of column width and 90 percent of the bearing area shall have full contact, the contact area being substantially symmetrical about the major and minor axes.

c) End plates at rafter splices shall be square to the axes of the rafter and in full contact for at least 75% of the area of the plates after assembly, the contact area being a generally symmetrical about major and minor axes.

6.06 Protective Coatings The protective coatings to be applied prior to delivery and/or on site are stated in Clause 6.11. Those parts of the structure which are to be encased in concrete shall be left bare, unless otherwise indicated and shall be free of loose rust, loose scale, grease and any deleterious matter. 6.07 Marking of Steelwork Before despatch from the workshop, all steelwork shall be clearly and indelibly marked to indicate its position and direction in the permanent works and the weight of each piece if this exceeds one tonne. 6.08 Delivery to Site The contractor shall ensure that all steelwork is handled, packed, transported and stored to prevent damage to the steelwork and protective coatings. Steelwork shall be stacked and stored at places of manufacture and on site to prevent distortion and damage. Suitable bearers shall be provided and measures taken to allow free drainage and ventilation and to prevent contamination. The contractor shall provide bearers during transportation and storage and shall take particular care to stiffen free ends and to prevent distortion. All machined surfaces shall be adequately protected. All bolts, nuts, washers, screws, small plates and small articles generally shall be suitably packed in crates or containers. Larger plates and bars, where bundled, shall be securely fastened together. All ropes and slings shall be covered to prevent damage

6.09 Erection

Erection of steelwork shall be carried out in a manner which will prevent damage of any kind to the steelwork. The contractor shall be responsible for the stability of the structure at all stages during erection and shall provide and remove on completion any temporary bracings and guys required. Columns shall be set in position on steel wedges and packings. Site connections shall not be fully tightened until sufficient of the structure has been levelled, aligned and plumbed to ensure completion of the remainder without any need to strain members into position. Bolted connections shall be made in accordance with Clause 6.05.08. On completion of erection, the structure shall be correct to line and level and shall not be out of plumb in any direction by more than 6.0 mm. Steel for frameworks for lift shafts shall be plumb to tolerances required by the lift manufacturer.

FLOOR, WALL AND CEILING FINISHING

IN-SITU FINISHINGS CEMENT, LIME, WATER, ETC A The cement, lime, water etc. are to be as previously described in “Concrete

Work” or “Brickwork” sections. B The method of mixing of materials for screeds and grounds, pavings, plastering

and undercoats are to be as previously described for mortar in “Brickwork”. SAND C The sand shall be approved, clean, naturally occurring sand, crushed stone or

crushed gravel sand. The sand for screeds and grounds, cement and sand pavings, internal and external plastering shall comply with B.S. 1199 and is to be graded in accordance with table 1 or table 2 as applicable.

INTERNAL OR EXTERNAL PLASTERING D The internal or external plastering is to be executed in accordance with C.P.

221 shall be composed of one part of cement to four parts of sand or one part of cement to one part of hydrated lime to six parts of sand by volume as hereinafter specified applied in one coat not more than 20 mm and not less than 13 mm thick unless otherwise described and finished with a steel or wood float as specified to a perfectly smooth and even surface.

TYROLEAN FINISH E where the plastering is specified as having tyrolean finish the Contractor is to

include for a thin spatter dash composed of one part of cement to two parts of coarse sand being vigorously thrown one.

WATERPROOFING F Where plastering is described as being waterproof the Contractor is to include

in his rates for incorporating “Drikon”, “Pudlo” or other equal and approved waterproofing compound mixed strictly in accordance with the manufacturer’s instructions.

POLISHED TERRAZZO FINISHINGS G All terrazzo finishings are to be laid by terrazzo specialists to be approved by

the Project Manager.

H The materials, mix and method of preparing and laying the terrazzo shall be in complete accordance the C.P. 204.

I The thickness of finishing stated if the finished thickness including grounds

and screeds and the Contractor shall allow for the additional thickness necessary for polishing and grinding.

POLISHED TERRAZZO FINISHINGS (cont’d) A Cement used in the manufacture of terrazzo shall be white cement tinted, if

required, with a colouring pigment to the approval of the Project Manager. B Aggregate shall consist of crushed marble of approved colour, hardness and

grading. The aggregate shall be angular and free form elongated or flaky pieces, dust, fines or other impurities. Aggregate of less than 3 mm shall not be used.

C Screeds are to be laid by the terrazzo specialist and shall consist of one part of

cement of three parts of coarse screened sand. The terrazzo finishing are to be laid whilst the screed is still green.

D The aggregate is to be crushed and graded before delivered to the site. The

pigment to be used shall be mixed mechanically with the cement in order to obtain uniformity of colour. The mix for all in-situ finishings is to consist of one part of cement to two and a half of aggregate by weight. The materials are to be thoroughly mixed in the dry state and water shall be added by means of a fine spray while the materials are being worked until the proper consistency is obtained. The mix shall be plastic but not fluid.

E The terrazzo finish shall be thorough compacted by tamping and only

sufficiently trowelled immediately after laying to give a true surface. When all water is extracted by further compacting, the surface is to be trowelled to a smooth and even surface with approximately 85 per cent of the marble aggregate showing.

G As soon as possible after laying, finishings are to be covered with damp hessian

or clean, wet sand and kept wet for four days, after which the terrazzo surface is to be ground with a coarse abrasive stone using an ample supply of water until the surface is completely smooth and the aggregate properly exposed.

POLISHED TERRAZZO FINISHING H The surface shall then be washed clean, all voids cleaned out and the entire

surface covered with neat grout, tinted as required, to fill all voids and kept damp for further period of not less than three days. The final polishing shall be carried out with a fine abrasive stone to give a fine grit finish.

I The Contractor is to include in his rates for making sample panels so that the appearance in-situ can be judged and a selection made.

J One completion of the building and before handing over, the finishings shall

be washed with hot water and a mild household cleaning powder free from alkali. All terrazzo finishings shall be left perfect at completion.

FINISHINGS EXPANDED METAL LATHING A Expanded metal lathing shall be 1.6 mm thick with a 31 x 13 mm mesh size

and thoroughly coated with asphaltum paint. B Expanded metal lathing shall be tightly stretched and secured with galvanized

wire staples, sufficiently, to prevent any sagging either under its own weight or under the weight of the applied finish.

TILE FINISHINGS PORCELAIN FLOOR TILING C The floor tiles shall be “Porcelain” floor tiles. Tiles are to be fixed with an

adhesive recommended by the manufacturer. GLAZED WALL TILING D The wall tile shall comply with B.S. 1281. E Wall tiling shall be fixed in strict accordance with the principles set out in C.P.

212 Part 1. CARPET TILES F The carpet tiles are to be “Belgotex Nexus Matrix Colt” or other equal and

approved rubber backed felt tiles of patterns of colours specified laid loose to a square pattern.

GLAZED WALL TILING

G The cement and sand ground shall be plumb and even to within 3 mm in any distance of 3 metres and shall be scored to afford a key for the bedding materials. All tiles shall be soaked for a minimum period of half an hour and fixed immediately after the surface water has drainage off. Before tiling commences, the ground shall be wetted just sufficiently to prevent absorption from the bedding materials. Uniform joints of not less than 2 mm shall be provided by spacer pegs and all tiling shall be laid with flat surfaces which shall not vary by more than 2 mm from the general plane any distance of 3 metres. All joints shall be wetted and filled with white cement grout worked into the joints and finished with pencil rounded recessed joints, all surplus grout it to be removed from the tiles and the tiling is to be given a final polish with a dry cloth.

WORKMANSHIP H All finishings are to be carried out by experience operatives under efficient

supervision.

WORKMANSHIP (cont’d) A All surfaces upon which screeds, pavings, etc. are to be laid shall be thoroughly

cleaned, hacked and coated with neat cement slurry immediately prior to laying the finish. All concrete wall or ceiling surfaces are to be well hacked or coated with spatter dash consisting of one part of cement to three parts of sand and all joints of brickwork are to be raked out to form a key before applying the grounds, and other in-situ finishings. All backing surface shall be moistened as necessary before receiving the finish.

B Mixing of materials shall be carried out in mechanical mixers and mixing shall

continue until the materials are uniformly mixed. C Each coat shall be allowed to dry out for as long as possible before any

subsequent coat of finish is applied. D Plaster under coats shall be brushed down to remove dust and loose particles

and, if of a porous nature and very dry, they are to be slightly wetted. E Screeds and pavings are to be covered up and kept moist until they have

attained sufficient strength to resist stresses due to shrinkage. F All finishings are to be clean and free from cement and plaster droppings and

all materials likely to cause stains. Floor finishing subjects to staining are to be covered up and protected until completion of the Works.

G All finishings are to be cleaned down and handed over in a perfect condition.

Any defective work shall be removed and reinstated at the Contractor’s expense.

RATES H The Contractor is to include in his rate for all of the foregoing and in the case

of all in-situ finishings, except where otherwise described, for all joints and fair joints to abutments and boundaries, internal angles, fair edges, rounded edges, chamfered edges, arises, chamfered external angles not exceeding 15 mm wide, rounded external angles not exceeding 15 mm radius, cover internal angles not exceeding 15 mm radius, v-grooves, throatings, making good to roof sheeting, intersections to groins and the like, making good around steel joists, channels, angles, tees, pipes, tubes, bars cables, conduits, ducting, trucking, brackets, timbers, newels, W.C. pedestals, floor springs, ventilators, soot doors and the like, making good to skirting, door and window frames, etc. and for all temporary screeds and rules.

I Rates for skirting, finishes to risers, kerbs and the like are include for all short

lengths, fair ends, stopped ends, etc.

GLAZING GLASS A All grass is to be of the best quality complying with B.S. 952 and free from

flaws, specks, scratches and other defects. All grass shall be stored to prevent the accumulation of moisture between sheets.

PUTTY B The putty for glazing to wood frames is to be best quality linseed oil putty

complying with B.S. 544. The putty for glazing to metal frames shall be an approved specially manufactured compound for glazing to metal.

C All glazing is to be in accordance with the recommendations and standard of

workmanship contained in C.P. 152. All well rebates are to be clean and dry and painted before glazing. All glass is to be well bedded, back puttied and sprigged to wood or secured with approved pegs or spring clips for glazing to metal. All glass is to reston properly placed locating blocks with a minimum clearance of 2 mm between the face of the glass and the rebate. All edges of glass shall be cut clean and a clearance of edge of 2 mm shall be provided for glass glazed to wood and 3 mm for glass glazed to metal. In the case of solar control glasses, opaque glass with painted surfaces, ordinary glass exposed to sunshine or when used with a dark background, glazing clearance at edges shall be a minimum of 3 mm all round where the longer dimension of less than 750 mm and not less than 5 mm all round where the longer dimension exceeds 750 mm. All glazing to metal sashes or surrounds shall be in accordance with the metal window manufacturer’s instructions and all putty shall be stripped at an angle to prevent accumulation of water.

PAINTS, ETC. D All paints, knotting, etc. are to comply with the relevant British Standard where

applicable. Colours are to be in accordance with B.S. 3810 or 4800 where applicable and the identification of pipelines is to be in accordance with B.S. 1710.

E All paints are to be the best of their respective types. Paints described as hard

gloss are to be those named as synthetic enamel, hard gloss enamels or super gloss enamels. Paints described as P.V.A. emulsion are to be those named as “acrylic P.V.A. or Acrylic emulsion”.

F All paints, etc, are to be delivered to the site in sealed containers and must be

used strictly in accordance with the instructions of the manufacturer and without adulteration or dilution. Where recommended by the treated with one coat of sealed, primer or petrifying liquid suitably bodies for opacity.

G All containers are to be properly labelled stating the name of the manufacturer, brand, type, colour and quality, interior or exterior, of the contents.

H Any paint which is defective or unsatisfactory shall immediately be returned to

the manufacturer. PAINT, ETC cont’d) A Undercoats and priming coats are to be types recommended by the

manufacturer for use on the particular material or surface and suitable for the subsequent coats specified. Undercoats are to be of similar but distinctive tints to the finishings coats.

B Finishings coats are to be of colours selected and approved in accordance with

the painting schedule prepare by the Project Manager and the Contractor is to include in his rates for painting in varying colours as directed by the Officer and the Contractor.

WORKMANSHIP GENERAL AND PREPARATORY WORK C All workmanship is to be in accordance with C.P. 231. D Clear away all dirt, rubbish and superfluous materials as it accumulates and

keep the work swept clean and the floors washed over while painting operations are in progress, and take all necessary precautions to keep down dust.

PAINT, ETC (cont’d) E All paints are to be the best of the respective types. Paints described as hard

gloss are to be those named as synthetic enamel, hard gloss enamels or super gloss enamels. Paints described as P.V.A. emulsion are to be those named as “acrylic P.V.A. or Acrylic emulsion”.

F All paints, etc. are to be delivered to the site in sealed containers and must be

used strictly in accordance with the instructions of the manufacturer and without adulteration or dilution. Where recommended by the manufacturer, all surfaces are to be treated with one coat of sealed, primer or petrifying liquid suitably bodied for opacity.

G All containers are to be properly labelled stating the name of the manufacturer,

brand, type, colour and quality, interior or exterior, of the contents. H Any paint which is defective or unsatisfactory shall immediately be returned to

the manufacturer.

I Undercoats and priming coats are to be types recommended by the manufacturer for use on the particular materials or surface and suitable for the subsequent coats specified. Undercoats are to be of similar but distinctive tints to the finishings coats.

J Finishings coats are to be of colours selected and approved in accordance with

the painting schedule prepared by the Project Manager and the Contractor is to include in his rates for painting in varying colours as directed by the Officer and the Contractor.

WORKMANSHIP GENERAL AND PREPARATORY WORK K All workmanship is to be in accordance with C.P. 231. WORKMANSHIP GENERAL AND PREPARATORY WORK A Clear away all dirt, rubbish and superfluous materials as it accumulates and

keep the work swept clean and the floors washed over while painting operations are in progress, and take all necessary precautions to keep down dust.

B All surfaces to be painted shall be clean, free from dust, dry and sound, not

friable or unduly absorbent and shall have reached a stable condition prior to painting. Painting shall not be carried out in unfavourable weather or unsuitable conditions.

C All paint shall be applied uniformly in thickness appropriate to the particular

type of paint used. D All paint containers shall be emptied and cleaned with a suitable solvent each

day after use. All brushes, knives, etc. shall be cleaned after use. E Adequate time shall be allowed to elapse between the applications of successive

coats of paint. Generally, each coat of paint shall be lightly rubbed down with fine glass paper and dusted before applying the next coat.

F All metal fittings and fastenings and fly screens are to be removed preparatory

processes are commenced, cleaned and prefixed in positions on completion. PAINTING ON PLASTERWORK, BRICKWORK AND CONCRETE

WORK G Should the surface to be painted or the quality of the paint to be used in such

that it will not provide an acceptable finish within the number of coats specified then the Contractor is to include in his rates for painting a “mist” coat, priming coat, sealing coat or coat of petrifying liquid to the approval of the Project Manager in addition to the number of coats specified.

H All plasterwork is to be thoroughly dry and mature before painting is

commenced. Under no circumstances will plasterwork showing efflorescence or blowing or pitting due to unslaked lime be decorated.

I All defective plasterwork, both internally and externally, is to be cut out and

made good before decoration. J Small cracks are to be made good with Alabastine filler and large cracks are to

be cut out with edges undercut, given one coat of oil paint filled flush with “Gipsy” or other approved stopping plaster.

PAINTING ON METAL WORK K The metalwork is to be clean and dry and is to be free from rust and scale with

steel wire brushes or other means and all oil, wax and grease is to be removed before the initial priming coat is applied.

L Special attention shall be given to the painting of edges, re-entrants,

protuberances such as bolt heads, rivets, etc. M On metalwork described as galvanized, the initial priming coat is to be of the

self-etching type. PAINTING ON WOODWORK A All woodwork is to be carefully prepared, cleaned and dry and glass-papered

and dusted. Large or loose knots are to be cut out and filled with sound wood or hard stopping. Small knots are to be treated with two coats of approved knotting free from resin and consisting of a solution of shellac in mentholated spirit. All nail holes are to be filled with an approval hard stopping.

B Woodwork that is to be painted shall be properly seasoned to a moisture

content appropriate to its use in the building. In no case shall be moisture content at the time of painting exceeds 18 per cent.

C External woodwork or woodwork in damp situations internally shall be painted

with strongly adhesent, water restant, flexible and otherwise suited paint for the particular conditions of exposure.

D All machined and finished surfaces of joinery whether to be visible or cancelled

shall receive one coat of appropriate primer end grain surfaces are to receive a second coat after the first has dried. All surfaces of paints to be jointed but not glued shall also receive one coat of priming paint and wherever practicable, shall be brought together while the paint is wet.

E In addition to the foregoing, the Contractor is to include in his rates for painting in narrow widths and to bands which have been included in general wall surfaces.

F The Contractor is to include in his rates for painter’s time and the necessary

materials for executing sample panels of paint in different colours so that the appearance on site may be judged and a selection made.

EXTERNAL WORKS

ROAD WORKS 401 The term "pavement" shall mean the layers of construction and subgrade

level consisting of sub-base, base and surfacing.

Definitions

402

The Contractor shall not commence work on the subgrade, sub-base and base until he has obtained the Engineer's approval in writing of the plant and methods that he proposes to use for each and every operation. The foregoing provisions shall not prevent the Engineer from requiring the Contractor to vary his plant or methods at any time during the execution of the Works, should the Engineer consider this essential for carrying out the Contract. The Contractor shall not vary his plant or methods which have been approved by the Engineer without previously obtaining the Engineer's approval of such variations.

Approval of methods

403 After any section of subgrade or pavement layer has been completed and has been approved by the Engineer, the Contractor shall ensure that it is not damaged or allowed to deteriorate. Any damage which may occur shall be made good to the satisfaction of the Engineer. Traffic on completed subgrades shall be restricted to that which, in the opinion pavement of the Engineer, is essential for construction of the Works, and the placing and spreading of sub-base material shall not be unduly delayed. Particular care shall be taken not to damage the subgrade during the placing of sub-base material. Sub-base material shall not be tipped on the subgrade for more than 200 m in advance of spreading. Spreading shall follow the deposition of material without delay. Vehicles and plant passing over partially completed subgrade or pavement shall not travel in a single track but shall be routed over as great a width as practicable. The wheels or tracks of vehicles or plant passing over pavement layers shall be kept free of mud or other undesirable matter.

Prevention of damage to partially completed subgrade and pavement

404 The carriageway and shoulder levels as shown on the Drawings or as directed shall be the surface levels before the application of bituminous

Tolerances

surface dressing and shall be set out in relation to the datum shown on the Drawings. The level at any point on the surface of each course shall conform to the tolerance shown in Column 2 of Table 404. In addition, the surface of the snbgrade, sub-base, base and shoulder level shall, when tested with a 3 m straight edge placed in any position of the finished surface parallel to the centre line, have no depression greater than that shown in Column 3 of Table 404. The transverse profile shall conform to the same accuracy, using a correctly shaped template instead of a straight edge except on superelevation. The longitudinal profile of the pavement layers shall be free from any pattern of undulations which, although individually within the tolerances overall, would adversely affect the riding qualities of the finished surface.

TABLE 404

Surface of Course

Tolerance from true surface level

Maximum depression tested with 3 m straight edge

Subgrade Sub-base Base Shoulder

+0-25mm +0-25mm

+13mm-0 +13mm-0

13 mm 13 mm 6mm 13mm

The surface of the shoulder where it joins the base shall in no case be at a higher level than, nor more than, the level of the adjacent surface of the base. The several surfaces of the subgrade and pavement layers shall be completed as specified herein and shall be inspected by the Engineer immediately before being covered up. The Contractor shall notify the Engineer when each area is ready for inspection, ensuring that all necessary labour, instruments, straight edges and templates are in attendance.

Subgrades 405 Compaction of subgrades shall be to the standard required in series 200 of the Specification. The Engineer may require such tests as proof rolling to determine possible deformation of the subgrade. If any areas of subgrade are found to b inadequately compacted or, in the opinion of the Engineer, exhibit instability, and such defects are due to the failure of the Contractor to comply with the requirements of the Specification.

Commencement of pavement

406 Construction of the pavement in any section of the Works shall not commence until the drainage works have been completed in respect of that section, unless directed otherwise by the Engineer.

construction

Selection of materials

407 The materials for construction of the pavement shall be selected and obtained by the Contractor who may employ the results of the materials survey carried out by the Engineer prior to the commencement of the work. Details of this materials survey will be made available to the Contractor. The information contained in the Engineer's materials survey shall not relieve the Contractor in any degree form his responsibilities under the Contract. The Contractor shall supply to the Engineer all such samples, test results and other information as he may require well in advance of the excavation f such materials and also during the construction of the Works, and shall use in the pavement only such materials as are approved in writing by the Engineer. Tests for suitability of materials, which shall include he determination of grading characteristics, plasticity indices, compaction and CBR tests shall normally average not less than one for every 1,000 m3 of material to be used

Should the proving of additional material be required then trial pits shall be dug on a 30m grid through the full depth of the material being investigated and one complete set of tests carried out on representative samples taken from the pits. The Contractor shall provide adequate supervision in borrow areas to ensure that only approved material is utilised for construction purposes. Approved material shall be selected and stockpiled by blading and ripping where necessary. The material shall be well mixed in the stockpile and sufficient material hall be stockpiled prior to loading to satisfy the Engineer that adequate mixing has been achieved. Approved material from the stockpile shall be loaded for transport to the Works using a front-loader (or similar means) which shall constantly traverse along the face of the stockpile during loading operations. If, in the opinion of the Engineer, any approved material is wasted or contaminated, for whatever reason, during the exploitation of a borrow area, and if such wastage of contamination causes a shortfall in the material available and scheduled for use from that location, then it shall be the Contractor's responsibility to locate and provide sufficient material to make up any deficit at his own expense. In this eventuality the Employer shall receive the benefit of any decrease in haulage but an increase in haulage shall be at the Contractor’s expense.

After use, borrow areas shall be left tidy, with overburden replaced,

408

sides trimmed to safe slopes and adequately drained to prevent the accumulation of standing water. All sub-base material shall be homogeneous throughout, shall consist of a natural or artificial mixture of hard durable particles and soil binder and shall have the following characteristics: (a) Type 1 Material (Sub-Base): 1. The CBR, obtained either unsoaked or after soaking for 96 hour

as specified in the documents, of the material compacted to 95% of the maximum dry density at optimum moisture content as obtained in the BS (Heavy) Compaction Test, shall be not less than 25%. When appropriate a shorter soaking period than 96 hours may be used with the specific approval in writing of the Engineer.

2. The product of the Plasticity Index and the percentage passing

the 0.075 mm sieve (hereafter termed the Fineness Index) shall not exceed 600. In addition the Plasticity Index shall not exceed 20%.

3. The CBR swell of the material shall not be greater than 0.5%. 2. The maximum size of aggregate shall be not greater than 65 mm

except where the material is laid in layers of 100 mm, when the maximum size of aggregate shall be not greater than 40 mm. 5. If the natural or artificial mixture of material when compacted and tested as specified in this Clause has a CBR of less than 25%, the Contractor may be directed to stabilise the material with cement as specified in accordance with Clauses 414 to 422 inclusive. (b) Type 2 Material (Sub-Base): 1. The coarse aggregate shall consist of hard durable particles of

crushed gravel or stone and shall have the following particle size distribution:

2. Percentage passing BS sieve size by weight 37.5 mm .. .. .. .. 100 20.0 mm .. .. .. .. 80-100 10.0 mm .. .. .. .. 55-40

Sub-base and shoulder material

Base material

5.0mm .. .. .. .. 40-60 2.36 mm .. .. .. .. 30-50 0.60 mm .. .. .. .. 15-30 0.075 mm .. .. .. .. 5-l0 3. The Fineness Index shall not exceed 600. In addition the

Plasticity Index shall not exceed 20%. 4. The Liquid Limit shall not exceed 40%. (c) Type 3 Material (Wearing course or shoulders): 1. The coarse aggregate shall consist of hard durable particles of crushed or uncrushed gravel and shall have the following particle size distribution: Percentage passing BS sieve size by weight 20.0 mm .. .. .. .. 100 10.0mm .. .. .. .. 80-100 5.0 mm .. .. .. .. 60-85 2.36mm .. .. .. .. 45-70 1.18mm .. .. .. .. 35-60 0.300mm .. .. .. .. 20-40 0.075mm .. .. .. .. 10-25 2. The Fineness Index shall not exceed 600, and the Plasticity Index shall not be less than 8%. 3. The Liquid Limit shall not exceed 40%. 409 Type 1 Material (Unstabilised gravel)

1. The material shall consist of a natural or artificial mixture of hard durable particles and

Soil binder free from soft materials and excess clay and shall have the following particle size distribution. Percentage passing By weight BS sieve size

37.5 mm 100 20.0 mm 70-90 10.0 mm 45-75 5.0 mm 35-60 2.36 mm 25-45 0.425 mm 20-35 0.075 mm 15-25

2. The Fineness Index shall not exceed 300. In addition the Plasticity Index shall not

exceed 12%. 3. The Liquid Limit shall not exceed 30%. 4. The CBR, obtained either unsoaked or after soaking for 96 hours as specified in the documents, of the material compacted to 98% of the maximum dry density at optimum moisture content as obtained in the BS (Heavy) Compaction Test shall be not less than 80%. When appropriate a shorter soaking period than 96 hours may be used with the specific approval in writing of the Engineer.

Type 2 Material (graded crushed stone):

1. The material shall consist of a natural or artificial mixture of hard durable particles and soil binder free from soft materials and excess clay and shall have the following particle size distribution.

Percentage passing by weight Coarse Medium Aggregate aggregate BS sieve size 53.0 mm .. .. 100 - 37.5 mm .. .. - 100 25.0 mm .. .. 55-80 80-95 20.0 mm .. .. 50-80 65-85 12.5mm .. .. 45-75 55-75 5.0 mm .. .. 30-60 35-55 2.36 mm .. .. 20-50 25-45 0.425 mm .. .. 10-25 15-25 0.075mm 2-10 5-15 2. The material passing the 0.425 mm sieve shall be non-plastic.

3. The Flakiness Index shall not exceed 35%. 4. The average loss determined after 5 cycles of the sodium

sulphate soundness test shall not be greater than 12%. Type 3 Material (choked stone): 1. The material shall consist of sound hard boulders or rock which,

when crushed, screened and mixed as necessary and free from flat or elongated particles, shall have an ACV not exceeding 30, and shall have the following particle size distribution:

Percentage passing by weight Coarse Medium 'BS sieve size aggregate aggregate 75.0 mm .. .. 100 - 65.0 mm .. .. 90-100 100 53.0 mm .. .. 35-70 95-100 37.5 mm .. .. 0-l5 35-70 25.0 mm - 0-15 20.0 mm 0-5 - 12.5 mm - 0-5 2. Fines for use as blinding shall have the following particle size distribution: Percentage BS sieve size passing by weight 10.0 mm .. .. 100 5.0 mm .. .. 85-100 0.150 mm .. .. 5-25 3. The Fineness Index of the material shall not exceed 300 and the Liquid Limit of the material shall not exceed 30%. In addition the Plasticity Index shall not exceed 12%. Type 4 Material (stabilised gravel): 1. The material shall consist of a natural or artificial mixture of

hard durable particles and soil binder free from soft materials and excess clay and shall be stabilised with Portland Cement in accordance with Clauses 414422 inclusive. The particle size distribution shall be as follows:

BS sieve size Percentage Passing by weight 37.5 mm .. .. 100 5.0 mm .. .. 45-100

0.075mm .. .. 0-40 The material shall be evenly graded. 2. The Fineness Index shall not exceed 300. In addition the

Plasticity Index shall not exceed 12%. 3. The Liquid Limit shall not exceed 40% 4. The CBR, obtained either unsoaked or after soaking for 96

hours as specified in the documents, of the material compacted to 98% of the maximum dry density at optimum moisture content as obtained in the BS (Heavy) Compaction Test, shall be not less than 100%. When appropriate a shorter soaking period than 96 hours may be used with the specific approval in writing of the Engineer.

Laying and compaction general

410 The material shall be laid to the dimensions, levels and grades shown on the Drawings or as directed by the Engineer. The material shall be placed, spread, watered, mixed, shaped and compacted by methods which shall not disturb the previous layer, and such methods shall be to the approval of the Engineer. The material shall not be spread over the area on which it has been tipped but shall be spread away from that area. Spreading shall proceed from the centre to the sides of the pavement on normal crossfall and from the high side to the low side on superelevation. Hauling of material shall not take place over uncompacted material. The sub-base material shall be spread without segregation uniformly to the full width of the subgrade in one operation. The base material shall be spread without segregation in lanes of uniform thickness. Where the material is to be laid in more than one layer the full width of base shall be completed before the second layer is commenced. Storage or stockpiling of materials shall not take place on partially completed subgrades or pavement. Specified thickness of 100 mm to 200 mm shall be laid in one layer and thickness exceeding 200 mm shall be laid in two equal layers except for Type 3 Base Material which shall be laid in layers as specified in Clause 413. The compaction plant shall be approved by the Engineer.

Compaction shall progress from the sides to the centre of the carriageway under construction or from one side towards previously compacted work. The compaction plant shall follow a regular route such that each track shall slightly overlap the adjacent previous track until the entire area of each layer has been covered. Sub-base material shall be compacted to a density not less than 95% of the maximum dry density of the material at optimum moisture content as obtained in the BS (Heavy) Compaction Test.

411

For base material the density as described above shall be 98%. In the case of Type 4 Material this density shall be the density of the stabilised material. In situ dry density tests shall be carried out by the Contractor on each layer of compacted material at the rate of 3 per 2,000 m2 or at such other intervals as directed by the Engineer. The surface of the finished sub-base and base shall be smooth and free from irregularities to the approval of the Engineer. Any weak spots in a layer which become apparent during compaction shall be cut out and repaired with sound material before the next layer commences. The material shall be thoroughly mixed by withdrawing from side to side so as to obtain a uniform mixture before it is finally spread and shaped.

Laying and compaction of Type 1 Base Material

412 The appearance of the compacted base shall be a mosaic of interlocking stones held firmly in position by successively smaller stones wedged into the interstices so that no cavities are present.

Laying and compaction of Type 2 Base Material

413 The material shall be laid in completed layers of not less than 75 mm and not more than 100 mm compacted thickness for medium aggregate, and not less than 100 mm and not more than 125 mm for coarse aggregate. After spreading of the aggregate the complete layer shall be partially compacted before the application of fines. A layer of fine material shall be spread over the base material and this shall be thoroughly vibrated into the aggregate. The operations of spreading and vibrating the fine material shall be repeated as necessary until penetration of fines into the aggregate ceases and

Laying and compaction of Type 3 Base Material

there are no hungry patches on the surface. The surface shall then be broomed to remove any excess fines and leave the aggregate standing 3 mm to 6 mm proud. Final compaction of the material shall then be carried out with a smooth-wheeled roller.

414 The Contractor shall submit in writing to the Engineer his proposals for the grading, mixing, transporting, placing, spreading and compacting of the material before commencing the construction of the trial length. This length shall be at least 1,000 m and the work shall be carried out in the presence of the Engineer. Work shall not commence on the pavement until the Engineer is satisfied that the Contractor's proposed plant and methods are adequate to carry out the stabilisation in accordance with the Specification. If in the opinion of the Engineer the Contractor's proposals are not satisfactory, the Contractor shall submit in writing proposals for modifying his plant and/or methods and shall, if the Engineer so requires, construct further trial lengths of pavement until specified results are obtained. During the construction of the trial lengths of pavement the Contractor shall employ such types and weights of rollers or other compaction equipment in such a manner as the Engineer may require. He shall also carry out such tests of the compacted densities and moisture content of the material in the pavement as the Engineer may require.

Trial length of stabilised Type 4 Material

Preparation of layer for stabilisation

415

The trial lengths of stabilised material shall be used to determine the following: 1. The best method of construction and the plant to be used. 2. To check the specified percentage of cement required to be mixed

with the material (calculated on the dry weight of the material).

3. The permissible upper and lower limits of moisture content for satisfactory Compaction, which shall not differ by more than 4% of the weight of the dry material.

The material to be stabilised shall be thoroughly broken up over the full width and depth of the layer and all stones, clods and lumps shall be broken down to comply with Clause 409 or removed as directed by the Engineer.

The degree of pulverisation of the material, as determined in accordance with BS 1924, shall not be less than 80%, before any water is added.

Watering 416 After pulverising water shall be added to the material as necessary to bring the moisture content to within the limits determined from the trial lengths.

Application of stabilising agent

417 Nominal rates of application of the stabilising agent per unit length of base shall be quoted as a percentage of the dry weight of the soil and will normally lie between 4% and 7%, but variation may be given by the Engineer from the results of trial lengths of stabilised material. The surface of the layer as prepared under the requirements of Clauses 415 and 416 shall be lightly compacted and the cement shall be spread uniformly over the full width of the layer to be stabilised by means of an approved type of mechanical spreader which should be capable of accurate calibration. Spreading of the stabilising agent may be carried out by hand with the approval of the Engineer. Bags of stabilising agent shall be accurately spaced at equal intervals along the section to be stabilised in a pattern calculated to produce the specified rate of application. The bags shall be broken out and the stabilising agent spread by suitable tools until uniform distribution over the required area is obtained. Traffic not engaged in the stabilisation process shall not be allowed to travel over the material.

Mixing of stabilising agent

418 Specially designed single or multipass machines shall be used for pulverising and mixing of the stabilised material and these shall be approved by the Engineer from the results of the trial lengths. Immediately after the stabilising agent has been thoroughly mixed with the pulverised material, the moisture content of the mixture shall be determined and the required amount of water added to again bring the moisture content of the mixed material to within the limits determined from the trial lengths. Each application or increment of water shall be incorporated into the mixture by means of the mixers in order to avoid concentration of water near the surface of the layer. Particular care shall be taken to ensure satisfactory moisture distribution over the full width and length of the section being processed, after the stabilisation agent has been added. Where the moisture content of any portion of the layer has been increased beyond the previously determined limits such portions shall be allowed to dry out to within the correct limits and they shall then be scarified, restabilised and remixed in accordance with the previous Clauses.

419

Special care shall be taken to ensure that no unstabilised layer exists between the compacted sub base and the stabilised base and the Contractor shall organise his mixing methods to achieve this. The blades on the rotors of mixing plant shall be regularly inspected and renewed as soon as wear begins to effect the efficiency of mixing. Compaction shall begin immediately after final mixing and the Contractor shall limit the area being processed at any one time so that the compaction and of stabilised finishing works shall be completed within two hours of the commencement of mixing on the area concerned. The material shall be compacted in accordance with Clause 410. During compaction the layer shall be continuously bladed and any loss of moisture corrected by further light application of water.

The Contractor shall prevent the formation of compaction planes near the surface of the layer and shall eliminate all ridges and other surface irregularities caused by the compacting equipment.

Compaction of stabilised material

420

Any finished portion of a stabilised layer adjacent to new work and which is used as a turning circle by equipment constructing the adjoining section shall be provided with a protective cover to prevent breaking up of completed work. Before completion of the adjoining section such cover shall be removed to permit the making of a smooth joint at the junction of the sections.

The Contractor shall so organise his work that longitudinal joints against hardened stabilised material are avoided as far as possible. In any day's work the area constructed shall extend over the full width of the carriageway and construction joints shall be cut to a vertical face and at right angles to the centre line of the road. Material adjacent to a joint which cannot be stabilised satisfactorily with the normal construction equipment may, with the approval of the Engineer, be stabilised by hand.

Adjoining sections

421 Immediately after the final compaction and grading of base and in the interval prior to the application of the curing coat the surface of the base shall be kept permanently damp by periodic spraying with water or by other methods previously approved by the Engineer Before the application of the curing coat bitumen, the base shall be swept clean of all loose material to the satisfaction of the Engineer. Immediately before spraying the base shall receive a further wetting so that the surface voids of the stabilised base are filled with water. The curing coat shall then be applied to the damp surface of the base after any standing surface water has been removed.

Curing of stabilised layers

The curing coat of RC 250 cut-back bitumen, or alternatively a suitable bitumen emulsion, shall be evenly applied over the surface of the base at a rate of 1.10 litresim2 or at such other rate of spread approved by the Engineer. It shall be applied within 12 hours of the compaction of the base. An approved type of bitumen distributor as specified in Clause 502 shall be used. Any areas not adequately covered shall be immediately resprayed with a hand spray to the satisfaction of the Engineer's Representative.

A. No traffic shall be permitted to run on the stabilised layer between application of the curing coat and first surface dressing.

Testing of Stabilised Layers

422 B. In addition to the test specified in Clause 410 the Contractor

shall carry out the following control tests:

(i) Cement Content. The test shall be the EDTA test method in

accordance with BS 1924 or such other test as approved by the Engineer. The coefficient of variation of stabiliser content shall not be more than 20% in the upper half of the stabilised layer and not more than 30% in the lower half of the stabilised layer. Any length of stabilised material with coefficients of variations greater than these shall be rejected.

(ii) The unconfined compressive strength test will be carried out on samples taken from the mixed base material at the rate of one per 750 m2. Three 203 mm 102 mm diameter cylinders shall be made for each test. These shall be compacted to the average dry density achieved in adjacent sections of completed base and shall have a strength of at least 1.72 N/mm2 after curing in wax for 7 days.

(iii) Field core samples shall be taken from the finished stabilised base at

a frequency of 5 Km. Cores shall be cut when the base is from 5 to 7 days old and the dimension of each core shall be checked and recorded. Cores shall be capped with suitable material so that the surface of the caps at each end are parallel and at right angles to

the axis of the core. Cores shall be tested for compressive strength at a moisture content as close as possible to that of the material at mixing and the average age of the stabilised base at test shall be 8 days. At least 90% of the cores shall have a compressive strength in excess of 0.860 N/mm2. The dry density of a proportion of the cores shall be determined using the water displacement method as described in BS 1924.

501 (a) Prime Coat: (i) Types 2 and 3 Base Material: The material shall be a cut-back bitumen of MC 30 Grade having a kinematic viscosity of 30-60 centistokes at 600 C, in accordance with BS 3690. (ii) Types 1 and 4 Base Material: The material shall be a cut-back bitumen of MC 70 Grade having a kinematic viscosity of 70-140 centistokes at 600 C in accordance with BS 3690. (b) Binder for stone seal: The material shall be a straight run bitumen having a penetration of 80/100 at 60oC in accordance with BS 3690. (c) Binder for sand/bitumen seal: The material shall be a cut-back bitumen of MC 3000 Grade having a kinematic viscosity of 3,000-6,000 centistokes at 600 C in accordance with BS 3690. (d) Binder for slurry seal: The material shall be a bitumen emulsion of the Class 3 stable slow breaking anionic type with a bitumen content of 55% in accordance with BS 434. (e) Sand for sand/bitumen seal: The material shall be clean sharp sand of 6 mm maximum size with not more than 20% passing a 0.600 mm sieve. As an alternative grit arising from the crushing of gravel or rock may be used. (f) Aggregate for slurry seal: The material shall be crusher dust with the following particle size distribution:

Materials for surface dressing

Percentage passing BS sieve size by weight

6.7 mm 100 5.0 mm 90-100

2.36 mm 65-95 1.18 mm 40-80 0.600 mm 25-60 0.300 mm 15-40 0.150 mm 10-25

0.075 mm 5- 15 The material shall have a Sand Equivalent Value of not less than 45. Mixtures of sand

and crusher dust conforming to the above grading shall be permitted providing the percentage of sand does not exceed 50%.

(g) Aggregate for stone seal: The material shall consist of approved single sized crushed gravel or rock graded in

accordance with BS 63. The aggregate crushing value of the material shall not exceed 25%.

The Contractor shall obtain the approval of the Engineer for his proposals for the production of aggregate.

Bitumen heaters and distributors

502

All bitumen shall be applied by an approved type of bulk mobile distributor fitted with hand spraying equipment and pressure feed and conforming to BS 1707. The distributor shall be so designed and operated as to distribute the bitumen in a uniform spray without atomisation. The machine shall be equipped with a special tachometer registering the speed of the vehicle accurately in metres per minute and so located as to be readily visible to the driver. The pump may be operated by a power unit independent of the truck power unit and shall be equipped with a pressure gauge to register the pressure at which the material is being forced through the nozzles. The power unit and pump shall be of adequate rated capacity to ensure uniform distribution of the bituminous binder at rates specified over the required width. The tank shall be fitted with a thermometer accurately registering the temperature of its contents and so situated as to be easily read, It shall also be fitted with a gauge accurately measuring the volume of its contents. The machine shall be capable of circulating heated bitumen through the spray bar whilst not spraying. Before commencing work the machine shall be tested over an area of waste ground or over a receiving vessel to chock that all jets are working satisfactorily. The Contractor shall provide a set of troughs 50 mm wide and shall carry out in the presence of the Engineer the Deposit Tray Test, as described in Sections 14.52 to 14.56 of "Bituminous Materials in Road Construction", published by Her Majesty's Stationery Office, London, to demonstrate that lateral distribution of the material is in accordance with BS 1707. This Test shall be carried out before the spraying work commences on the Site and subsequently as required by the Engineer. Work shall not commence until the results of the Test are satisfactory. The Contractor shall check the rate of spread of bitumen by means of the Road Spray Test and it shall be carried out as described in Sections 14.57 to 14.60 of "Bituminous Materials in Road Construction All bitumen heaters shall conform to BS 1676. The boiler shall be fitted with thermometers accurately registering the temperature of their contents and so situated as to be readily accessible, and the material shall be continuously mixed.

Application of prime coat

503

Immediately before the application of the prime coat, the surface of the base shall be swept clean of all loose material with soft-haired brushes to the satisfaction of the Engineer. The surface of the material to be primed shall be in a damp condition and this shall be achieved by a light sprinkling of water as necessary.

The prime coat shall be uniformly applied over the surface area at the rate of 0.650.75 litres/m2 for MC 30 and 0.85-1.10 litres/m2 for MC 70 or as otherwise directed by the Engineer. The temperature of application shall be 350 C-700 C for MC 30 and 550 -850 C for MC 70. Any areas not adequately covered shall immediately be resprayed by hand to the satisfaction of the Engineer. The prime coat shall be allowed to dry out thoroughly and for a minimum period of 24 hours. Traffic shall not be permitted to use the primed surface unless the surface is adequately protected to the approval of the Engineer. Notwithstanding the above, traffic shall not run over a stabilised base during its period of curing.

Application of surface dressing, general

504 Before the application of further surfacing the primed surface shall be thoroughly examined and any weak or damaged areas shall be made good by cutting out the unsatisfactory material, replacing and re-priming to the approval of the Engineer.

Such areas after repair shall be in conformity with the remainder of the primed surface.

Immediately before covering, the primed surface shall be brushed and thoroughly cleaned to the approval of the Engineer.

The actual rate of application of bitumen as measured by the Road Tray Test shall be

within 10% of the specified rate.

The Contractor shall ensure that joints between spraying strips are straight, that no bitumen is sprayed on adjacent completed surfacing and that no excess or deficiency of bitumen shall occur.

Any sections which show a deficiency in binder shall be respraycd sections show an excess of binder, the material shall be removed by and the section resprayed, all to the approval of the Engineer. commencement of spraying a section of surface, a strip of paper 2 m wide or similar protection shall be laid over the previous section and the bitumen

sprayer shall commence spraying from over this strip.

Protection shall also be laid on the shoulders to ensure that the surface dressing terminates at the edge of the carriageway and forms a neat line. Rolling shall commence at the edge of the carriageway and proceed in a longitudinal direction. Overlap on successive passes shall be at least half the width of the roller.

The completed surfacing layer shall be evenly textured, show no lean or fat areas and shall not have any areas which will allow the accumulation of water

505

Straight run 80/100 penetration bitumen shall be applied at a temperature between l65o C and 190oC. The rate of application at spraying temperature

Stone seal

shall be as follows:

Rate of application of bitumen (1/m2) Chipping Size

20 mm 1.15-1.50 .. .. .. .. .. 1.15-1.50 14 mm 1.05-1.35 .. .. .. .. .. 1.05-1.35 10 mm 0.90-1.20 .. .. .. .. .. 0.90-1.20 The rate of application within the ranges given above shall be as directed by the Engineer. Surface dressing shall not be carried out when the road temperature is below 250 C. Immediately following tile application of bitumen the surface shall be covered with approved stone chippings. The rate of spread of chippings shall be such that the finished appearance shall be that of a close-knit mosaic of stone particles firmly adhering to the bitumen, with individual chippings in contact with those immediately surrounding them. The surfacing shall be rotted with an approved pneumatic tyred roller immediately after the application of the chippings. All aggregate shall be dry and free from deleterious matter. Where chippings have become dusty in transit or in the stockpile these shall be cleaned to the Engineer's satisfaction. At least one sieve analysis and one determination of flakiness index shall be carried out on chippings per working day. Samples for test shall normally be taken from the material on the Site where surfacing is in progress, but stockpiles of chippings shall be sampled and tested when the Engineer so requires. Where double or triple surface seals are specified at least one week shall elapse between the application of each layer when the surfaces may be opened to traffic with the approval of the Engineer. Before the second and third layers are applied the road surface shall be thoroughly brushed to remove all loose and deleterious material. When the road is opened to traffic the speed of the traffic shall be limited to 30 km/hour (20 m.p.h.) until the loose material has been removed by the Contractor. Suitable speed limit signs shall be erected and traffic signs warning the motorist of the possibility of loose flying stones shall be displayed. The length of carriageway to be sprayed in one operation shall not exceed that which can be immediately covered by stone chippings. This length shall be to the Engineer's approval, and shall not normally exceed one half carriageway width by 500 in length.

Slurry seal

506 The mixing and spreading of the slurry shall be carried out by the mechanical, continuous flow process.

The equipment shall be an approved self-propelled machine capable of mixing and delivering the material accurately to the Specification and spreading the Slurry at the specified rate in a uniform layer, all in one continuous operation. The spreader shall be equipped with an adjustable flexible strike-off blade and the machine shall be equipped with a spray bar for controlled watering of the surface immediately ahead of the application of slurry. The binder and aggregate shill be mixed in the following proportions, together with a catalyst of Ordinary Portland Cement:

Percentage by

weight

Material Aggregate .. .. .. .. 83-81 Binder .. .. .. .. 16-18

Cement catalyst .. .. .. .. 1 The mixed material shall have a creamy consistency and the liquid and solid particles shall show no tendency towards segregation. Water with a PH content between 4 and 8 may be added during mixing in order to obtain the correct slurry consistency. The quantity of water can vary with the type of aggregate and with a rising air temperature, although as a guide 160 litres of water per cubic metre of dry aggregate may be taken. The proportions of the material maybe varied by the Engineer between the above limits from. the results of the Wet Track Abrasion Test which the Contractor shall carry out on trial mixes with varying percentages of residual bitumen, before commencement of slurry sealing. This test shall be carried out in accordance with Clause 1607.

Slurry sealing shall not be carried out when the air temperature is below 120 C unless the air temperature is above 70 C and rising.

Immediately prior to the application of the slurry the surface shall be lightly watered until the surface is damp.

The rate of application of the material shall be measured in square metres per cubic metre (m2/m3) of dry aggregate and shall be as shown below unless otherwise directed by the Engineer. Size of aggregate For stone seal Rates of spread 10 mm 240-260 m2/m2 13 mm 210-230 m2/m3

19 mm 155-185 m2/m3

Where the slurry is laid in lanes the overlap shall not exceed 75 mm. The edges of the slurry shall be trimmed to obtain a clean edge to the carriage way to the correct horizontal alignment before the material has hardened. Rolling of the material shall be carried out by an approved pneumatic tyred roller immediately after the slurry has dried out, and shall continue for a minimum of six passes. The road may then be opened to traffic with the approval of the Engineer. 507 The aggregate shall be a crushed stone and shall have the following particle

size distribution: Premixed surfacing

Percentage passing by weight

BS sieve size l0mm .. .. .. .. 100 5 mm .. .. .. .. 65-85 2.36 mm .. .. .. 45-65 0.300 mm .. .. .. .. 20-30 0.150 mm .. .. .. .. 12-20 0.075 mm .. .. .. .. 6-12 The binder shall be a straight run bitumen having a penetration of 80/100 at 600C in accordance with BS 3690. The filler material required to be added to the crushed stone to comply with the above grading shall be crushed stone dust, Ordinary Portland Cement or approved sand. The Contractor before commencing the premixed surfacing shall design trial mixes by the Marshall Method of Design and subject the material to stability, flow and voids tests in accordance with ASTM D 1559-65 and ASTM D 1188-68. The material shall comply with the following: 1. Stability shall exceed 2.22 kN. 2. Flow shall exceed 2 mm but not exceed 5 mm. 3. Voids shall exceed 3% but not exceed 5%. The bitumen content of the mixed material which shall exceed 5% by weight but not exceed 8% shall be selected by the Engineer from the results of these tests.

508 The mixed materials shall be transported in clean vehicles and shall be covered over when in transit or awaiting tipping. The use of dust, coated dust, oil or water on the interior of the vehicles to facilitate discharge of the mixed materials is permissible but the amount shall be kept to a minimum, and any excess shall be removed by tipping or brushing.

Transporting, laying and compacting of premixed

surfacing Mixed material shall be spread, levelled and tamped by approved self-propelled pavers and shall as soon as possible after arrival at the Site be supplied continuously to the paver and laid without delay. The rate of delivery of material to the paver shall be so regulated as to enable the paver to be operated continuously and it shall bc so operated whenever practicable.

The rate of travel of the paver and its method of operation shall be adjusted to ensure an even and uniform flow of material across the full width of layer, freedom from dragging or tearing of the material and minimum segregation. The material shall be laid in accordance with the laying recommendations in BS 594 subject also to the following overriding requirements. Hand laying of any premixed material shall he permitted only in the following circumstances: (i) For laying regulating courses of irregular shape and varying thickness. (ii) In confined spaces where it is impracticable for a paver to operate. (iii) For footways. (iv) At the approaches to expansion joints at bridges and viaduets. The material shall be compacted as soon as rolling can be effected without causing undue displacement of the mixed material and while this has a rolling temperature of at least 1200 C. The material shall be uniformly compacted by an 8-10 tonnes smooth steel wheeled roller having a width of roil not less than 500 mm or by a multi-wheeled pneumatic tyred roller of equivalent weight. Final roiling shall be carried out by an approved smooth-wheeled roller. The material shall be rolled in a longitudinal direction from the sides to the centre of the carriageway, overlapping on successive passes by at least half the width of the rear roller or in the case of a pneumatic tyred roller, at least the nominal width of one tyre. Rollers shall not stand on newly laid material while there is a risk that it will be deformed thereby. When a paver laying premixed material approaches in expansion joint at a bridge or viaduct, it shall be taken out of use as soon as there is a dancer of the material being laid fouling the Joint. In laying the remainder of the pavement up to the joint and the corresponding area beyond it by hand, the joint or joint cavity shall not be fouled with surface material. Hand-raking of premixed material which has been laid by a addition of such material by hand-spreading to the paved area of level will be permitted only in tile following circumstances; (i) At the edges of the layers of material and at gullies and manholes. (ii) At the approaches to expansion joints at bridges or viaducts. (iii) Where otherwise directed by the Engineer.

Joints between layers both longitudinal and transverse shall be formed by cutting back the exposed joint to a vertical face along the road centre line or at right angles to it, discarding all loosened material and coating the vertical face completely with a suitable grade of bitumen before the adjacent layer is commenced. 6.10 Foundations Bolts And Anchorages 6.11 Foundation bolts shall be complete with tubular steel sleeves, washer plates, anchor frames, washers and nuts. Templates shall be used for correct location of anchorages and foundation bolts. After foundation bolts and anchorages have been cast into the concrete, the bolt ends shall be protected by greasing and wrapping with suitable protective material. 6.11 Specification for Protective Coatings 6.11.01 Scope of Section This section covers the surface preparation and the type of protective coating required for structural steelwork. 6.11.02 Surface preparation, materials and application Surface preparation, materials and application of the material shall comply with BS EN ISO 12944. The surfaces shall be prepared as described in 6.11.3 or 6.11.4 below, as applicable. 6.11.03 Materials : scheme 1 Scheme 1 applies to mild and moderate exposure conditions as stated in the relevant drawings. After fabrication all steelwork is to be hand-cleaned thoroughly to remove loose mill scale and rust by chipping, scraping and wire brushing. Any surface which will be inaccessible after fabrication must be hand cleaned and painted one coat red lead prior to assembly. Immediately after cleaning, the steelwork must be painted with a red lead primer paint to BS7956, with a dry film thickness of 70 microns for both mild and moderate exposure conditions. The primer coat shall be followed by a coating of paint pigmented with micaceous iron oxide with a dry film thickness of 40 microns for mild exposure conditions and 80 microns for moderate exposure conditions. 6.11.04 Materials : scheme 2 Scheme 2 applies to severe exposure conditions as stated in the relevant drawings. All steelwork is to be blast cleaned as St 2, as defined in BS 7079. After blast cleaning the steel must be brushed or cleaned by vacuum to remove all traces of dust or abrasive.

The steelwork must be covered with a protective coating of zinc within 4 hours of being blast cleaned. If the steelwork is to be fabricated after the zinc coating has been applied the welded joints, cut edges, drilled holes, etc. must be prepared to remove all contaminants and a remedial coat of paint applied. The application of the zinc coating to the steel must be in accordance with the requirements of BS EN 22063. The coating must have a nominal thickness of 100 microns and must not be thinner than 75 microns at any point. 6.11.05 Application All protective coatings are to be applied as stated in the manufacturer’s instructions. 6.11.06 Final coat A final coat (or coats of paint) is to be applied as stated in the Architectural drawings or Specifications. 6.11.07 Repairs to Paintwork Any paintwork damaged during transportation on erection must be repaired at site, after proper surface preparation, with one or more coats of zinc-rich paint which must be additional to the main painting scheme. 8. SPECIFICATION FOR PRECAST CONCRETE PAVING BLOCKS 8.1 Scope of section

This section covers the use of precast, unreinforced concrete paving blocks in external trafficked paved areas.

8.2 Definitions For the purposes of these specifications the following definitions apply. Paving block : precast, unreinforced concrete unit used as a surfacing material.

Complementary fitting : unit that is used to infill and enable an area to be completely surfaced (a complementary fitting can be a piece of a paving block).

Upper face : surface intended to be seen when in use Bed face : surface generally parallel to the upper face and in contact with the bedding after laying Facing layer : layer of concrete providing the upper face of a paving block, of different material and/or properties to the main body or backing layer.

Spacer nib : small protruding profile on a side face of a paving block Arris : part of a paving block where two faces meet; an arris can be bevelled,

rounded, or chamfered. Chamfer : bevelled arris with horizontal or vertical dimensions exceeding 2mm. Work dimension : dimension of a paving block specified for its manufacture. Actual dimension : dimension of a paving block as measured

Overall length : length of the longer side of the smallest rectangle that encloses the

entire paving block, excluding any spacer nibs. Overall width : length of the shorter side of the smallest rectangle that encloses the entire paving block, excluding any spacer nibs. Thickness : distance between the upper face and the bed face of a paving block.

Slip resistance : ability of a paving block to resist relative movement between a pedestrian foot and the trafficked paving block surface.

Skid resistance : ability of a paving block to resist relative movement between a

vehicle tyre and the trafficked paving block. 8.3 Materials

The materials used for the manufacture of paving blocks shall be at the manufacturer’s discretion. Details of the materials used be declared in the manufacturer’s production control documentation in accordance with Annex A of BS 6717.

8.4 Requirements 8.4.1 General

Paving blocks shall be produced with a single type of concrete throughout. It shall be permissible for a “square” arris to be either bevelled or rounded. A “square” arris shall have horizontal and vertical dimensions not exceeding 2 mm. The dimensions of a chamfer shall be at the discretion of the manufacture. The dimensions shall be declared in the manufacturer’s production control documentation.

8.4.2 Shape and dimensions 8.4.2.1 General

All dimensions in this subclause are work dimensions. Excluding complementary fittings, the overall length and the overall width of a paving block shall not exceed 250 mm. The length of paving block divided by its thickness shall not exceed 5. The width of a paving block shall be not less than 50 mm at a distance of 50 mm from any edge.

8.4.2.2 Work dimensions

The work dimensions of all paving blocks shall be at the discretion of the manufacturer. The work dimensions shall be declared in the manufacturer’s production control documentation.

8.4.2.3 Spacer nibs, chased and profiled side faces

If a paving block is produced with spacer nibs, a draw, or chased and profiled side faces, the work dimensions of these items shall be at the discretion of the manufacture. The work dimensions of these items shall be declared in the manufacturer’s production control documentation.

8.4.2.4 Tolerances When the dimensions of a single paving block are measured in accordance with BS 6717 the tolerances shall be as specified in Table 1.

Table 1 – Tolerances for work dimensions

Block thickness Tolerance

mm

Length and width mm

Thickness mm

<100 +2 +2

>100 +3 +3

The maximum difference between any two measurements of the thickness of single paving block shall be no greater than 3 mm.

For the dimensions of non-rectangular paving blocks, the tolerances shall be at the discretion of the manufacturer. These tolerances shall be declared in the manufacture’s production control documentation. For paving blocks with an upper face that is intended to be plane, the tolerances for flatness and bow shall be as specified in Table 2.

Table 2 – Tolerances for flatness and bow

Length of straight edge mm

Maximum convex mm

Maximum concave mm

Up to 300 300 400

Not applicable 1.5

2

Not applicable 1

1.5

8.4.3 Physical and mechanical properties 8.4.3.1 Complementary fittings

When complementary fittings cannot be tested according to BS 6717, they shall be deemed to conform to this British Standard, provided that they have at least the same concrete quality as paving blocks that conform.

8.4.3.2 Weathering resistance

When paving blocks are tested in accordance with BS 6717, classes shall be assigned to them according to the mean value of the test results as specified in Table 3. Families of paving blocks that have not been tested for weathering resistance shall be assigned class W1. Table 3 – Weathering resistance classes

class

Mass loss after weathering test Mean value (kg/m2)

W1 No performance determined

W2 1.0, no individual value> 1.5

W3 Manufacturer’s declared value

NOTE The

Manufacturer’s declared value is usually applied to secondary processed products

8.4.3.3 Tensile splitting strength

When paving blocks are tested in accordance with BS 6717, the mean tensile splitting strength shall be not less than 3.9 MPa and no individual result shall be less than 2.9 MPa. Additionally, no individual result shall have a breaking load less than 250 N/mm of the length of the failure plane.

8.4.3.4 Abrasion resistance

When paving blocks are tested in accordance with BS 6717, the abrasion resistance shall be to class A2.

8.4.3.4 Slip/skid resistance When paving blocks are tested in accordance with BS 6717, the slip/skid resistance shall be to class S3.

8.4.4 Visual properties 8.4.4.1 Appearance

When examined in accordance with BS 6717, the upper face of paving blocks shall not exhibit defects such as cracking or flaking.

8.4.4.2 Texture If paving blocks are produced with a special surface texture, the texture shall be at the discretion of the manufacturer. The properties of the textured surface shall be declared in the manufacture’s production control documentation. Paving blocks with a special surface texture shall be deemed to conform to this Specification if, when examined in accordance with BS 6717, there are found to be no significant visible difference to any samples supplied by the manufacturer and approved by the purchaser.

8.4.4.3 Colour The paving blocks shall be of natural concrete colour.

8.5 Marking

The following particulars relating to paving blocks shall be indicated clearly on any of the delivery note, invoices, packing, or supplier’s certificate or brochure supplied with the consignment of paving blocks. a) identification of the manufacturer or the factory : b) date of production: c) class(es) where applicable (see Table 4) d) the marking BS 6717 : 2001 e) identification of the product (i.e concrete paving blocks).

Table 4 – Classes and their identification

Parameter Class marking

Weathering resistance W1, W2 or W3

Abrasion resistance A1 or A2

Slip/skid resistance S1, S2, S3 or S4

8.6 Construction 8.6.1 Terms and definitions

Paving unit : a concrete paving block.

restraint : device that serves to prevent lateral movement of paving units and to prevent loss of the laying course material.

edge restraint : restraint used at the edges of an area being paved

intermediate restraint : restraint used at intervals along an area being paved

NOTE Intermediate restraints are generally used when steeply sloped areas are being paved.

temporary restraint : restraint used when a partially paved area is to be trafficked or when it is necessary to preserve the integrity of the laying face at the end of a working period.

interlock : effect of frictional forces between paving units which prevents them moving in relation to each other.

laying course : layer of material on which paving units are bedded.

laying face : working edge of the surface course to which paving units are being placed.

roadbase : one or more layers of material placed above the sub-base that constitutes a structural element of a flexible or composite pavement. sub-base : one or more layers of material placed immediately above the subgrade. capping layer : layer of granular or stabilized material at the top of the subgrade to provide a working surface and an improved foundation for the pavement. surface course : layer of interlocked paving units that acts as a wearing surface

and forms part of the structure of the pavement. inboard cut : paving unit that that is cut to one quarter or more of its original

length. laying pattern : arrangement of paving units either for structural requirements or

for visual effects. jointing material : material applied to fill the joints between paving units. joint width : distance between adjacent paving units or units and restraint.

void : gap between adjacent paving units , or units and restraint, formed by virtue of the shape of the units and how they fit together

NOTE voids are incorporated into the design of a permeable pavement to facilitate drainage. conventional pavement : pavement consisting of a surface course of paving units

laid with narrow joints and filled with jointing material that has a low permeability.

Permeable pavement : pavement consisting of a surface of paving units laid wide joints, void or openings, that allow water to pass through into the pavement construction.

8.6.2 Subgrade, sub-base and roadbase

Preparation of the subgrade and the construction and type of the of the sub-base

and roadbase (if present) should be as described in the Specification for Roadworks.

The subgrade, sub-base and roadbase should be presented such that :

a) the surface levels of the sub-base and roadbase are within the tolerances given

in Table 5 below. Table 5 – tolerance of surface levels

Layers of pavement

Maximum permissible deviation from the design level

Sub-base +5 -10

Roadbase +5 -10

Laying course +10 -5

Surface course +6 -6

b) the longitudinal falls and the cross falls of the completed pavement are

introduced into the pavement at the subgrade level and allow the water to run off, thus avoiding

ponding: c) the surface of the sub-base and roadbase is tight and dense enough to

prevent laying course material being lost into it during construction and use;

d) the extent of the site preparation includes enough room to provide adequate

foundations and backing for any edge restraint. 8.6.3 Restraint 8.6.3.1 Edge restraint

Edge restraints consisting of kerbs or channels or other approved edge strips, as scheduled or given on the drawings, shall be constructed on the sub-base or other specified formation before any units are laid.

8.6.3.2 Temporary restraint

For areas of pavement that cannot be completed for some time and that might be subjected to trafficking near the edge of the pavement, the Contractor shall construct temporary restraints to prevent the movement of the laid paving units. During full compaction of the pavement, temporary restraints should be constructed to resist lateral movement of the pavement.

8.6.4 Laying course 8.6.4.1 Material The laying course should contain no material which acts as a binder and could detract from the flexible nature of the pavement, e.g. cement or lime.

The laying course material for conventional pavements should be naturally occurring sand from the quaternary geological series or sea-dredged sands. It should conform to Table 6 below.

Table 6 – Grading for laying course material for conventional pavements

Sieve size mm

Percentage by mass passing %

8 100

6.3 95 – 100

4 85 – 99

0.5 30 – 70

0.063 (fines content) 1.5

8.6.4.2 Moisture content

When preparing the laying course, the material should be moist without being saturated. It should show no free water and should bind together when the material is squeezed in the hand and the pressure released. If the prepared laying course becomes saturated prior to laying the paving units, it may be removed and replaced, or allowed to dry to an acceptable moisture content. To control the moisture content of a stockpile, covers may be used.

8.6.4.3 Preparation of laying course

The laying course should be laid on the roadbase or, if there is no roadbase, the sub-base. The laying course material should not be used as a regulating course or to achieve falls.

The thickness of the laying course after final compaction of the surface course should be 30 mm, with a surface level tolerance conforming to Table 5. One of the following methods of screeding the laying course should be used for concrete block paving. a) Compaction of laying course : Spread the material in one layer and

compact this layer using a plate compactor. In order to achieve the target laying course thickness, make allowances for the reduction in thickness achieved during compaction. Level the surface by screeding.

b) Uncompacted laying course : Spread the material loose in a uniform layer. Screed it to a thickness that, after the paving blocks have been laid and compacted into place, will give the final target laying course thickness.

8.6.5 Type of units and laying pattern 8.6.5.1 Rectangular paving units shall be used and the laying pattern shall be 900

herring bone pattern

8.6.5.2 Laying paving units

General Paving units should be placed, either mechanically or by hand, on the prepared laying course in the nominated pattern. Any minor adjustments necessary to maintain the laying pattern should then be made. A string line may be used to check the alignment of the paving units. The paving units should be laid in such a way that, after final compaction, the surface course will conform to the surface level tolerances given in 9.6.2 (a) and the surface regularity given in Table 7 below. Table 7 – Surface regularity of the surface course

Measure of surface regularity Conventional pavements

Flatness of pavement 10 mm under 3 m straight edge

Difference in level at the joint of 2 mm

adjacent paving units

An order of laying which maintains an open laying face should be followed. The first row of paving units should be aligned against a straight section of the edge restraint, intermediate or temporary restraint or by using a straight edge or string line. The alignment of paving units should be checked periodically for all laying patterns, e.g by using string lines, and adjustments made where necessary. Joints Paving units should be laid with a joint width typically within the range of 2 mm to 5 mm.

8.6.5.3 Cutting and trimming General

The paved area should only incorporate cut units at the perimeter of the pavement, at an intermediate restraint, around obstacles and to accommodate motifs and pattern changes.

Where paving units need to be trimmed, sizes smaller than a quarter of the original plan size of the unit should be avoided. To avoid cutting paving units to smaller than a quarter of their original size, complimentary fittings and inboard cutting as recommended in BS 7533-3 should be used to complete the surface course. To achieve a straight cut face, concrete paving blocks should be cut using a hydraulic or mechanical splitter. The accuracy of cutting the unit should be such that joint between the cut unit and the full unit or the edge restraint should be not more than 5 mm. Trimming and laying around obstructions The paving units should be trimmed to fit after laying full paving units around any obstruction. The joints between the obstruction and the paving units should not exceed 5 mm. Mortar should not be used to infill small gaps. Where it is necessary to use infill around an obstruction, class C25/10 concrete should be used for the full depth of the paving unit.

8.6.5.4 Jointing and void filling material

The jointing material for conventional pavements should conform to Table 8 below.

Table 8 – Grading for jointing material for conventional pavements

Sieve size mm

Percentage by mass passing %

2 100

1 85-99

0.5 55-100

0.063 (fines content) 0-2

Material that might stain the pavement surface should not be used.

8.6.5.5 Compaction of paving units into the laying course

Prior to compaction, the surface should be free of debris. A vibrating plate compactor should be used to fully bed the blocks into the

laying course material. If there is a tendency during the compaction operation for individual blocks to

move or misalign, then a small amount of jointing material conforming to 9.6.5.4 may be applied to assist in maintaining blocks in their correct position. The surface course should be compacted using a plate compactor, making two or more passes. For concrete paving blocks with a small or no chamfer, prior to compaction,

jointing material conforming to 9.6.5.4 should be brushed over the surface and into the joints until the joints are full. Surplus jointing material should be removed. Completion of compaction The compaction should preferably be carried out as soon as possible after the laying of the paving units. Compaction should not occur within 1 m of any laying face. All areas of paving, other than an area within 1 m of a laying face, should not be left uncompacted at the completion of the day’s work.

8.6.5.6 Joint filling after compaction of paving units into the laying course

It is essential that the joints between paving units are filled.

Prior to applying any jointing material, the surface should be free of debris. Prior to joint filling the paving surface should be checked so that : a) the surface level tolerance conforms to 9.6.2 (a), Table 5; b) the flatness of the pavement conforms to 9.6.5.2, Table 7; c) the difference in level at the joint of adjacent paving units conforms to

9.6.5.2, Table 7; d) joint width is consistent; e) joints are correctly aligned; f) there are no damaged or broken blocks. Any necessary corrective action should be taken to ensure that the pavements conform to item a) to f).Joints between concrete block pavers might have been partially filled during the compaction referred to 9.6.5.5. However, after the compaction the joints should be completely filled with material conforming 9.6.5.4.

8.6.5.7 Final compaction of the surface course

Following the completion of joint filling in accordance with 9.6.5.6 the surface course should undergo a final compaction using a plate compactor to ensure complete filling of the unit-to-unit joints by the surface-applied jointing material. Where necessary, further jointing material conforming to 9.6.5.4 should be added and the paving compacted once more. This process of joint or void topping up should be repeated, when necessary, by brushing in further joint filling material until the integrity of the pavement is established. This is particularly relevant during the initial period of the pavement life. This final compaction should be completed as soon as practicable after laying. After final compaction the pavement should once again be checked in accordance with 9.6.5.6, with any necessary action taken to rectify the pavement.

8.6.6 Construction in adverse weather conditions (conventional pavements)

In adverse weather conditions, units should not be laid on saturated laying course material. The filling of joints is not possible in damp conditions. In such conditions, the joints should be topped up at the earliest opportunity.

8.6.7 Additional work after early trafficking The surface course should be inspected soon after completion and at regular intervals thereafter. Additional jointing materials should be brushed in where necessary. Vacuum sweepers should not be used on the surface course for at least three months after laying in order to reduce the risk of jointing material being lost.

Whenever vacuum sweepers are used, they should be adjusted to avoid removal of jointing material.

9.0 SPECIFICATION FOR STORM WATER DRAINAGE

C. 9.1 Handling Pipes

D. All pipes are to be carefully handled and stacked. Any pipes which exhibit signs of damage shall be rejected by the Engineer / Supervising officer and must be removed from the site immediately.

E. 9.2 Excavation for Pipelines

F. Trenches for pipelines shall be excavated in any material to a sufficient depth and width to enable the pipe and any specified or agreed joint, bedding, haunch and surround to be accommodated. The width of the trench shall not exceed the external diameter of the pipe plus 500mm.

G. The sides of trenches and other excavations shall be adequately supported at all times. Where shown on the drawings, or directed by the Project Manager the supports shall be left in.

H. Material arising from the excavation of pipelines shall be classified as suitable or unsuitable in accordance with “Earthworks for Drainage Structures”. Unsuitable material shall be disposed of to spoil.

I. 9.3 Laying of pipes

J. Immediately before pipelaying commences the excavation shall be thoroughly cleaned of all stones, soil or other debris which may have fallen therein.

K. Pipes must be laid true to line and level. Each pipe shall mate concentrically with the next to preserve a true and uniform invert. Pipes shall be uniformly bedded and must not be allowed to rest on the joints or on stones or hard objects in the bottom of the trench.

L. 9.4 Jointing of Concrete Pipes

M. For ogee jointed pipes, the joints shall be thoroughly cleaned before laying, and cement mortar 1 to 2 shall be applied evenly to the ends for jointing so as to completely fill the joint. The pipes shall then be properly drawn together and the outside the joint shall be neatly pointed with a bank of cement mortar approximately 125mm wide and 25mm thick.

N. The inside of each joint shall also be pointed up as the work proceeds.

O. Special care shall be taken to ensure that excess of cement mortar is neatly cleaned off while each joint is being made and any earth,

cement or other material thoroughly cleaned out of the pipes by drawing a tight fitting wad through them as the work proceeds, or by other approved means.

P. 9.5 Bedding, Surrounding or Haunching of Pipes

Q. Bedding, surrounding and haunching of pipes shall be carried out sing concrete of class C15/20 as specified. In carrying out his work the contractor shall take care to pack the concrete under and around the pipes to ensure even bedding and solidity in the concrete, and the concrete shall not be thrown directly on to the pipes. The upper surface of the concrete shall be struck off with a wooded screed or template and neatly finished off.

R. No concrete surround or haunching shall be placed until the pipework concerned has been inspected and approved by the Project Manager.

S. Concrete surround shall be constructed at least to the minimum dimensions shown on the drawings. The cost of any formwork shall be included in the rates for concrete surround.

T. Payment will be made only for the concrete beddings, surrounds and haunches shown on the Drawings, and any additional concrete to completely fill trenches, etc, shall be deemed to be included in the rates for concrete bedding, surrounds and haunches.

U.

V. 9.6 Backfilling

W. Trenches shall be backfilled with selected approved material but not before the permanent work therein has been approved by the Project Manager and measurements taken and agreed.

X. For pipes which are not surrounded with concrete, filling material for a depth of 300mm above the pipe shall be wholly free from stones and shall not be thrown direct onto the pipes, but shall be placed and packed with care under round them. All filling shall be deposited and compacted in layers not exceeding 150mm compacted thickness to a dry density not less than 90% modified AASHTO density. The moisture content of the material shall be adjusted to ±2 percent of optimum.

Y. 9.7 Measurement of Pipes

Z. The nett length laid shall be measured. The rates entered in the Bills of Quantities shall include for supplying, laying and jointing, all in accordance with the requirements of the Specification.

AA. 9.8 Measurement of Earthworks for Pipes

BB. Items for excavation shall be deemed to include backfilling with approval selected material as specified and the disposal of surplus to spoil or fill areas as directed.

CC. The depth of excavation shall be taken as the vertical distance from ground level, or from lowest bulk excavated level if this is lower, to the underside of the pipe or the underside of the concrete surround as applicable. The width of the excavations for pipes shall be taken as the nominal diameter of the pipe plus 500mm or the pipe specified plus the width of the concrete surround. The lengths of excavations for culverts shall be taken as the horizontal distance between the faces of the headwall excavations

DD. The rates stated in the Bills of Quantities shall include for all trimming and cleaning operations, any additional excavation for working space or caused by overbreak, dealing with water, supporting the sides of excavations, backfilling and all other costs and expenses incurred by the requirements of this section of the Specification.

EE. 9.9 Inlet and Outlet Structures

FF. Inlet and outlet structures shall be as shown on the Drawings, or as instructed by the Project Manager. Foundation slabs shall consist of concrete of the class specified. The walls shall be built of brickwork and shall be either fair face or rendered.

GG. 9.10 Lined Drainage Channels

HH. Drainage channels shall be lined with solid concrete blocks where indicated on the drawings, or where instructed by the Project Manager. The cross-section shall be as shown on the drawings and the excavations shall be neatly trimmed to correct lines and levels before lining is constructed. Blockwork shall be 75mm thick, stretcher bonded with staggered joints, and shall be true to line and lever and vertical joints shall be raked if the Project Manager so directs.

II. Any irregularities in the surface of the excavation on which the blockwork is to be laid shall be made up with mortar. Blockwork shall be cured and spaces between the edge of blockwork and surrounding ground filled with suitable material tamped to the highest state of compaction compatible with not causing damage to the blockwork.

JJ. 9.11 Materials

KK. The materials to used for the construction of the inlet and outlet structures and the lined drains shall be as specified in the relevant sections in “Concrete Works” and “Blockwork”

LL. 9.12 Grouted Pitching

MM. The stones used for grouted pitching shall be approved hard angular rocks, roughly cubical in shape of dimensions such that they can be laid with a minimum thickness equal to that shown on the Drawings.

NN. The stones shall be laid by hand on a bed of fresh 1 : 3 cement sand mortar, interlocked and rammed. The interstices may be choked with large rock spalls. A grout of 1 :3 cement sand mortar shall be

thoroughly rammed into all interstices and smoothed off flush with the pitched face.

OO. 9.13 Gabions

PP. Gabion protection shall be located as indicated on the Drawings, or as directed by the Project Manager.

QQ. Wire mesh gabions shall be of a type and standard approved by the Project Manager, and shall be used in strict accordance with the manufacturer’s instructions and recommendations regarding stone packing, type and size of stone, and handling of units.

RR.

SS. The rate in the Bill of Quantities shall include for the supply of all materials, including rockfill, wire mesh cages, binders, connectors, for loading, transporting and off-loading, for the assembly and filling of the cages and for any other work necessary for the construction of the gabions.

TT. 10. SPECIFICATION FOR FOUL DRAINAGE

UU. 10.1 PVC Pipes and Fittings

VV.

WW. PVC Pipes and fittings for soil waste and ventilation shall comply with BS 4660 and shall be a minimum of class 4.

XX. 10.2 Excavation and Backfilling

YY. Excavation for pipe trenches shall include for levelling and ramming bottoms or grading to required depths, planking and strutting to sides and executing all other items listed in the Excavation Specifications, backfilling in accordance with the pipe manufacturer’s instructions, making good any depressions in surface levels after the ground has settled and spreading and levelling surplus excavated material. Generally, the initial backfilling shall be executed with the finest of the excavated material, free from stones or other materials liable to puncture or fracture the pipes, sufficient to provide 150mm minimum cover and the remainder shall be backfilled with selected material rammed in 150mm (consolidated) layers. Care shall be taken not to disturb the pipework whilst backfilling.

ZZ. 10.3 Manhole Construction

AAA. All manholes are to be constructed in solid blockwork in 1:3 mortar and have a minimum internal dimension of 900mm square, unless specified otherwise.

BBB. The base is to be 150mm thick class C20/20 concrete, and the cover slab to be 100mm thick class C20/20 concrete reinforced with A142 mesh reinforcement. Sides are to be plastered with 1:3 cement

plaster with a steel trowel finish. Manholes deeper than 1:2 m are to be constructed with step irons. Manholes deeper than 2m shall be 1100mm square internally.

CCC. 10.4 Manhole Spacing

DDD. Unless shown otherwise on the drawings, manholes shall generally not be spaced more than 30m apart.

EEE. 10.5 Laying

FFF. Pipes must be laid perfectly straight and to a constant gradient between manholes. Joint must remain watertight under a pressure head of 1.5m.

GGG. 10.6 Minimum Gradients

HHH. The minimum gradient for 100mm and 150mm diameter sewers are 1:80. and 1:150 respectively.

III. 10.7 Maximum Gradients

JJJ. The maximum gradient for 100 mm and 150mm dia sewers is 1:40. Gradients as steep as 1:30 may be permitted with the express permission of the Engineer. Drop manholes must be used to avoid steeper gradients.

KKK. 10.8 Gulley Traps

LLL. Where specified, gulley traps are to be constructed as follow:-

MMM. Gulley traps to be in stoneware or similar approved having 150mm diameter or 150mm x 150mm square inlets and 100 mm diameter trapped outlets. Gratings are to be cast iron, galvanised or coated. Gullies are to be bedded in and surrounded with class C20/20 concrete not less than 150mm thick. Brick or concrete kerbs are to be provided to four sides of gullies 80mm wide and 120mm high built in cement mortar and rendered all round in cement and sand (1:3) including forming all arises.

NNN. 10.9 Concrete Embedding

OOO. PVC foul sewers passing under roadway or parking areas, or in situations where there is less than 300mm of cover to the pipe crown, are to be surrounded with 150mm of class 20/20 concrete on all sides.

PPP. 10.10 Pipe Jointing

QQQ. Joints shall be formed using proprietary runner “o” rings or by solvent welding. Pipe socketing by heating over an open fire shall not be permitted.

RRR. 10.11 Bends

SSS. All pipes shall be laid straight. The bending of pipes by heating over an open fire shall not be permitted.

TTT. 10.12 Sewer to be left clean

UUU. During construction, temporary open ends of pipes shall be closed off to prevent the ingress of vermin or soil etc. before that works are handed over, all sewers are to be rodded to ensure that no obstruction have been left within them.

VVV.

WWW.

XXX.

YYY.

ZZZ.

AAAA.

64 SUMMARY. The Security Unit (PSEC) of the African Development Bank (AfDB) is responsible for protecting the people, property, information and reputation of the Bank globally. One significant challenge has been in the area of procurement of standardized technical security equipment and services; specifically CCTV, access control, alarms, barriers and system integration. Our vision is to have standardized technical security systems at all Bank locations, with all systems fully integrated into the Bank’s Headquarters security “control room”. The Bank will benefit greatly from a “Framework” style agreement or contract with appropriate technical security providers in order to standardize, synergize and improve all technical security aspects of the Bank’s security posture. PSEC currently has ongoing technical security requirements for 37 Country Office locations across Africa, and two major buildings in, the HQ in Abidjan and an office in Tokyo. PROCUREMENT REQUEST. Establish a framework procurement agreement for procurement of standardized technical security equipment that will be the same hardware and software with an access card compatible to the Headquarters (HQ) and/or and all regional hubs, security control rooms. This framework agreement must provide for a standardized and integrated technical security approach for CCTV, access control, badges, security doors, alarm systems, barriers and full integration of all technical security systems to the Bank’s Headquarters and/ This procurement request provides the scope of work, system description, and generic bill of quantities. SCOPE OF WORK. This framework procurement agreement is global in scope, with requirements both across Africa, and globally. Integrated and standardized technical security equipment is required at all Bank Country Office locations on the continent of Africa, at the HQ in Abidjan, for in the hubs and for the External Relations Offices (ERO’s) which are located in Tokyo, Japan.

SYSTEM DESCRIPTION. The current system in place in Abidjan is standard. All systems should conform to this model and be integrated with the current systems operating from Tunis. All badge access, CCTV, barriers and alarm systems should be standardized. SYSTEMS DETAILS. All components of the technical security systems must be integrated on all sites and compatible with the Bank’s HQ.

• All equipment selected for installation shall be compatible with the Intruder Detection, Access Control, including vehicle barriers, pedestrian turn styles and

metal detection units, and CCTV systems installed in the AfDB offices and regional hubs.

• All of the elements of the Technical Security Installation are to be capable of integration. All AfDB systems are integrated systems. All equipment selected for installation must be compatible, integratable and be capable of recognizing and operating with the protocols of each element of the system.

• The systems installed must be remotely accessible from the AfDB, PSEC (RSOC) from the Headquarters (HQ) in Abidjan, Cote d’Ivoire. This remote access capability must allow for:

o 1. Remote access and management of all elements of the system, including access to the control of individual cameras, including PTZ telemetry, contained within the CCTV system;

o 2. The remote access to and uploading of data held at the installation site and shall include CCTV data, Access Control Data, Intruder Detection System operational history.

• The remote access to the systems as contemplated in 4 above shall allow for real time access and historical data access. Data will be downloadable, transferable and provide for a one year retention of all CCTV, badging, alarming and access control data.

• All equipment for the proposed installation shall be sourced from within Member States as recognized by the African Development Bank.

• All sub-systems of the system shall be IP addressable, and in selection of equipment for installation the installer/supplier shall ensure that all systems have protocol compatibility. The primary systems used in the AfDB TRA Offices in Tunis, Tunisia are of specific models, and the installer/supplier must ensure that all equipment selected for installation have the capacity to communicate with or share protocols with this equipment.

• All system designs shall incorporate a dedicated security system UPS capable of holding the Security System in an operational status for at least 8 (eight) hours.

• All elements of the system shall be protected against lightning strikes and electrical power surges/spikes.

• Where the proposed installation requires the installation of Pedestrian and Vehicle entry/exit barriers the installer shall make use of the product range as supplied by AUTOMATIC SYSTEMS, who are the approved supplier for Pedestrian and Vehicle Access Control hardware by the AfDB. In all

instances the installer/supplier shall ensure that the actual Access Control System/Software selected for the proposed installation shall have the capability of interfacing and communicating seamlessly with the logics fitted to the AUTOMATIC SYSTEMS hardware selected.

SUB-SYSTEMS AND COMPONENTS. There are five major components to each technical security installation; Closed Circuit Television (CCTV), Access Control, Intruder Detection System alarms (IDS), Barriers, and Integration.

• CCTV SYSTEM

o All equipment contained within the system must be of an internationally recognized standard and be IP addressable. All elements of the CCTV system must be fitted with ant-tamper devices.

o All internal cameras shall be of a mini-dome design unless otherwise specified.

o All external cameras shall be of a dome design, unless otherwise

specified. Where the specified cameras are to have PTZ capability these cameras shall have at least 99 pre-programmable identification points, and be high-speed. All external cameras shall have a minimum lighting requirement of 0.3Lux.

o All external cameras shall be in weatherproof housings.

o The data storage media shall have the capacity to record at least 2

(Two) weeks of data at a rate of 25 frames per second per camera and the system will allow for a full year backup retention of all video.

o All cameras shall have the capability of being programmed to enter

‘VMD’ mode during selected time windows, if specified. Where a camera is programmed to enter ‘VMD’ mode, in the event of the activation of an element of the Intruder Detection System (See A.2.3. below) these cameras shall return to ‘live mode’ and take precedence over all other cameras contained within the CCTV sub-system for the duration of any activity within the specific areas. The CCTV sub-system shall be capable of recording historical movement of any intruder within the building.

o All cameras shall have the capability of identifying areas within the

field of view which will be treated as ‘alarm zones’ for VMD, and any camera which recognizes a violation of the ‘alarm zones’ shall be capable of creating an alert and the camera shall take precedent over all other cameras in the sub-system.

o All installation shall allow for redundancy.

• ACCESS CONTROL SYSTEM

o All access cards supplied for the Access Control System shall be compatible with the Access Control Cards and Card Readers currently in use at the AfDB Headquarters in Abidjan. The Access Control Cards currently in use are supplied by a unique service provider, and the Access Control Cards, Card Readers and Controllers and Head End equipment for the proposed installation shall be compatible with the current service provider Systems and be able to recognize and interface with the current service provider protocols. In all instances an Access Control Card issued at any AfDB office shall have the capacity and capability of enabling an Access Control Card issued at any AfDB Country Office to be programmed into the Access Control Data Base of any other AfDB Country Office, at the AfDB and at the HQ in Abidjan, Cote d’Ivoire.

o All equipment contained within the system must be of an

internationally recognized standard and be IP addressable. All elements of the system shall be fitted with ant-tamper devices.

o All systems installed shall include an Access Control Card printer

which has the capability of printing photographic images onto the Access Control Cards.

o All doors fitted with Access Control Card Readers shall be equipped

with emergency release mechanisms (break-glass units). Further, all Access Controlled doors shall be linked to the existing Fire Detection System and be capable of entering automatic release in the event of an emergency situation developing.

o When fitting door closers to doors controlled by Access Control

Units the installer/supplier shall ensure the door frames and support walls are of sufficient strength to support the use of door closers. All fitted door closers shall have a minimum rating of 350kg.

o All Access Control Systems shall provide full management systems.

The systems shall be capable of recording all transactions within the system.

o All access control Systems shall have the capability of identifying,

recording, and alerting any illegal entry attempts. Where an illegal entry attempt is detected the system shall integrate with the CCTV

sub-system and activate any camera in the area of the illegal entry attempt area.

o The system shall be configured for anti-pass back protection.

o The access control system shall be configured to control all

pedestrian entry/exit barriers and vehicle booms. The Access Control System shall have the capability of implementing/managing a ‘visitor-host’ profile.

o All pedestrian barriers shall be fitted with durable materials, and

where the construction is of glass this shall be anti-shatterproof.

o All fire escape doors shall be fitted with external 3mm metal cladding, and shall also have push-rail release mechanisms fitted internally.

o Where required, and specified, retractable solid vehicle anti-ram

barriers shall be installed.

o All Card Reader Controllers shall be capable of recording a minimum of 1000 transactions in an off-line mode. On return to an on-line mode the recorded data will be transferable to the main access control database.

o The Access Control System shall allow for redundancy.

• INTRUDER DETECTION SYSTEM (IDS)

o All equipment contained within the system must be of an internationally recognized standard and be IP addressable.

o All elements of the IDS must be fitted with anti-tamper protection.

o All circuits of the IDS will be fitted with end-of-line resistance. This

shall be fitted at the IDS control panel.

o Unless otherwise specified all Passive Infra-Red detectors shall be capable of selection of a range of Fresnel Lenses (Wide Angle, Long Range, and Curtain).

o The IDS system shall allow for multiple means of communication. This

communication shall include, but may not be limited to: Tele-dialer, RF, and GSM.

o The IDS management system shall allow for the reporting of: Intrusion Detection, Panic Alarm, Duress Mode, Fail to Arm, and Illegal disarm attempt.

o All Fire Escape doors shall be fitted with Magnetic Switches and set to

24hr zones.

o The IDS system shall be integrated with the CCTV sub-system so that, in the event of an alarm activation the CCTV cameras in the area of intrusion shall be activated and record activity within the area of activation. If required any such event activation shall allow the CCTV system to transmit, via GSM, images to pre-identified recipients.

o The IDS shall allow for redundancy.

• BARRIERS

o Pedestrian Barriers. All Access Control Barriers shall be of solid and robust construction, preferably with stainless steel housings and shatter proof glass. The access control barriers may be of either retractable single/double barriers or drop arm barriers. The access control barriers shall be designed for use in high density pedestrian traffic areas and have a maximum transaction time of 1 second.

o In addition to the installation of standard pedestrian style access control barriers suppliers/installers shall make provision for the installation of manually controlled barriers to allow for the movement of disabled persons, furniture and general office supplies. The operation of these ancillary barriers shall be of the same design as the primary access control barriers and be managed from a centralized security point.

o Currently at Headquarters in Abidjan and in Tunis, the pedestrian

access control barriers are of the PNG382 and PMD 337 product range. Where possible this standard should be maintained in all installations.

o Vehicle Barriers. All vehicle access barriers shall be of a single drop-

arm barrier design. The motor and logic housings shall be weather proof, and where applicable, in harsh weather condition, the housings shall be treated with weather resistant materials. Traditionally the drop-arms are of plastic construction. Where other materials are used for the construction of the drop-arm barriers these barriers shall be treated with weather protective materials.

o Currently at Headquarters in Abidjan and in Tunis, the product BL

229 drop-arm barrier and the product RSB70 retractable anti-ram

barrier are used. Where possible this standard should be maintained in all installations.

• INTEGRATION

o The primary integrated system installed at the AfDB RDGN offices in Tunis and at HQ in Abidjan are based on best practice systems and protocols.

o All new security system installations and existing security system upgrades will be on and integrated platform

o To this end, all new security system installations and existing security

system upgrades must be IP based and all sub-systems within the Security System shall have the capability of interoperability, integration and seamless communication.

o In all new security system installation and upgrades of existing

systems installers/suppliers shall ensure that the protocols employed by each manufacturer of the elements of the sub-systems are compatible and allow for seamless communication.

o As it is intended to monitor all integrated system installations

remotely, from Headquarters in Abidjan, it is imperative that any new system installations and any existing security system upgrades have the ability to communicate with best practice protocols.

o In the selection of equipment for new integrated security

installations and the upgrading of any existing systems the suppliers/installers shall ensure that the equipment used in the installation are of a recognized international standard and have a proven reliability and performance capability. All equipment selected shall be sourced from within Member States of the African Development Bank.

o Nothing contained under this section ‘Integration’ shall detract or

diminish any of the specified system requirements and specifications as detailed in the remainder of this document.

o The supplier and service provider will ensure both the local and

remote integration of all CCTV, Access Control, Barriers and IDS systems.

CLOSED CIRCUIT TELEVISION CAMERA SPECIFICATIONS (INDOOR)

PART 1 – GENERAL 1.1 REFERENCES

A. European Norm: 1. EN 50121-4:2006 Railway Applications - Electromagnetic

Compatibility - Part 4: Emission And Immunity Of The Signaling And Telecommunications Apparatus.

2. EMC directive 2004/108/EC. 3. EN 50130-4:1995+A1:1998+A2:2003 (CE) Alarm Systems, Part 4 –

Electromagnetic Compatibility – Product Family Standard: Immunity Requirements for Components of Fire, Intruder and Social Alarm Systems.

4. EN 50130-5: Alarm Systems, Part 5 – Environmental Test Methods (corresponds with VDE 0830 parts 1-5).

5. EN 50132-5-2: Alarm systems - CCTV surveillance systems for use in security applications - Part 5-2: IP Video Transmission Protocols.

6. EN 55022, Class B – Information Technology Equipment – Radio Disturbance Characteristics – Limits and Methods of Measurement for Emission.

7. EN 55024 Information technology equipment. Immunity characteristics. Limits and methods of measurement.

8. EN60950-1 – Safety of information technology equipment (IT Equipment)

9. CE Declaration of Conformity. 10. CB scheme.

B. Federal Communications Commission (FCC) (www.fcc.gov): 1. FCC CFR 47 part 15; subpart B, Class B Digital Devices.

C. International Electrotechnical Commission (IEC):

1. IEC 62676-2-3: Video surveillance systems for use in security applications – Part 2-3: Video transmission protocols – IP interoperability implementation based on WEB services.

2. IEC 62471 (IR version): Photobiological safety of lamps and lamp systems.

D. International Organization for Standardization (ISO):

1. 9001: Quality System.

E. Underwriters Laboratories, Inc. (UL) (www.ul.com): 1. UL 60950-1 UL Standard for Safety of Information Technology

Equipment. 2. UL 60950-22 Information Technology Equipment – Safety - Part 22:

Equipment to be installed outdoors.

F. Voluntary Control Council for Interference (VCCI): 1. VCCI J55022 V2/V3.

1.2 DEFINITIONS

A. Sensitivity: refers to the minimum level of light the sensor needs to generate an acceptable video picture, and is measured in lux.

B. Day/Night (infrared sensitive): The camera has normal color operation in

situations where there is sufficient illumination (day conditions), but when there is little light available (night conditions) the sensitivity is increased by removing the infrared cut-off filter to provide a monochrome image.

C. iDNR (intelligent Dynamic Noise Reduction): The Intelligent Dynamic

Noise Reduction applies temporal noise filtering when no motion is detected. The filtering reduces the noise in the image and this makes the encoder step more effective.

1.3 SYSTEM DESCRIPTION

A. Video Surveillance Remote Devices: 1. Fixed Indoor Dome 2MP IR 3-10mm Auto CCTV camera.

B. Performance Requirements:

1. Complete indoor network video surveillance system inside a dome camera.

2. 1080p resolution. 3. Built-in active infrared illuminator. 4. Built-in Essential Video Analytics to trigger relevant alerts and quickly

retrieve data. 5. Intelligent Dynamic Noise Reduction (iDNR) technology. 6. Intelligent streaming technology for reduced bitrates.

7. H.264 and H.265 encoding. 8. Automatic varifocal 3 to 10 mm, DC Iris fixed board-mounted lens. 9. True day/night function. 10. Quad-streaming IP video. 11. Micro SDHC/SDXC card slot for edge recording up to 2 TB. 12. ONVIF conformant. 13. +12 VDC, +24 VAC and Power over Ethernet (IEEE 802.3af

compliant).

1.4 SUBMITTALS

A. Product Data: 1. Manufacturer’s data, user and installation manuals for all equipment

and software programs including computer equipment and other equipment required for complete video management system.

B. Shop Drawings; include:

1. System device locations on architectural floor plans. 2. Full Schematic of system, including wiring information for all devices.

C. Closeout Submittals: 1. User manual. 2. Parts list. 3. System device locations on architectural floor plans. 4. Wiring and connection diagram. 5. Maintenance requirements.

1.5 QUALITY ASSURANCE

A. Manufacturer: 1. Minimum of 10 years’ experience in manufacture and design Video

Surveillance Devices. 2. Manufacturer’s quality system: Registered to ISO 9001 Quality

Standard.

B. Video Surveillance System: 1. Listed by UL, EN and FCC specifically for the required loads.

Provide evidence of compliance upon request.

C. Installer: 1. Minimum of 5 years’ experience installing Video Surveillance Systems.

1.6 DELIVERY, STORAGE AND HANDLING

A. Deliver materials in manufacture’s original, unopened, undamaged containers; and unharmed original identification labels.

B. Protect store materials from environmental and temperature conditions following manufacturer’s instructions.

C. Handle and operate products and systems according to manufacturer’s instructions.

D. Bosch provides off-the-shelf availability for our top selling products and same-day or 24-hour shipping.

1.7 WARRANTY

A. Provide manufacturer’s warranty covering 3 years for replacement and repair of defective equipment.

1.8 MAINTENANCE

A. Make ordering of new equipment for expansions, replacements, and spare parts available to dealers and end users.

B. Provide factory direct technical support from 8:00 a.m. to 8:00 p.m. via

phone and e-mail. PART 2 – PRODUCTS 2.1 MANUFACTURERS

1. All proposed products must be approved by the African Development Bank Group’s Chief Regional Security Officer.

2. Proposed products must provide a line-by-line compliance documentation. 2.2 FIXED INDOOR DOME 2MP IR 3-10MM AUTO CCTV CAMERA

A. General Characteristics:

1. The camera shall be capable of operating in an indoor environment. 2. The camera shall offer 1080p resolution at 16:9 aspect ratio. 3. The camera shall offer tamper detection and Essential Video Analytics. 4. The camera shall offer two-way full duplex audio communication. 5. The camera shall have a built-in active infrared illuminator (NDI-4502-

AL only) 6. The camera shall provide a CVBS (PAL/NTSC), 1 Vpp, BNC, 75 Ohm

analog output that allows hybrid video output. 7. The camera shall utilize Intelligent Dynamic Noise Reduction (iDNR)

technology to reduce the bitrate and storage requirements by removing noise artifacts

8. The camera shall offer Intelligent streaming possibilities. 9. The camera shall have a gyrosensor/accelerometer. 10. The camera shall provide eight independent, fully programmable privacy

mask areas.

11. The camera shall be easy to install.

B. Imaging Requirements: 1. The camera shall offer a 1/2.9-inch CMOS image sensor. 2. The camera shall offer a video resolution of 1080p@30fps. 3. The camera shall offer 1920 x 1080 sensor pixels. 4. The camera shall offer an upright video mode. 5. The camera shall be fitted with a board-mounted fixed varifocal 3 to

10 mm, DC Iris, F1.3 lens with a lens view angle of: a. 34° - 101° (Horizontal). b. 19° - 54° (Vertical).

6. The camera shall have a wide dynamic range of 85 dB. 7. The camera shall have high sensitivity in color (0.12 lx) and in

monochrome (0.02 lx). The camera shall offer a minimum sensitivity of 0.0 lx in IR mode (NDI-4502-AL only).

8. The camera automatic electronic shutter shall offer a shutter speed of 1/30 (1/25) to 1/15000.

9. The camera shall be capable of capturing and storing images using the following compression standards: a. H.265 MP. b. H.264 MP. c. M-JPEG.

C. Network Video:

1. The camera shall provide direct network connection using H.265, H.264 and M-JPEG compression and bandwidth throttling to efficiently manage bandwidth and storage requirements while delivering outstanding image quality.

2. The camera shall allow full camera control and configuration capabilities over the network.

3. The camera shall deliver video, at rates up to 30 images per second, via TCP/IP over a 10/100 Base-T, auto-sensing, half/full duplex, RJ45 Ethernet connection.

4. The camera shall support AutoMDIX. 5. The camera shall conform to the ONVIF Profile S and G standard. 6. The camera shall conform to protocols: IPv4, IPv6, UDP, TCP,

HTTP, HTTPS, RTP/RTCP, IGMP V2/V3, ICMP, ICMPv6, RTSP, FTP, Telnet, ARP, DHCP, SNTP, SNMP (V1, MIB-II), 802.1x, DNS, DNSv6, DDNS, SMTP, iSCSI, UPnP (SSDP), DiffServ (QoS), LLDP, SOAP, Dropbox, CHAP, Digest Authentication.

D. Audio:

1. The camera shall have line in and line out jack connectors for two-way, full duplex audio communication with audio compression AAC, G.711, L16 (live and recording).

E. Night Vision (Infrared):

1. The camera shall have a 10 LED high efficiency array (850 nm) for effective night vision up to 30 m (98 ft).

F. Control:

1. The camera shall be configured via a web browser or PC surveillance software.

G. Connectors:

1. The camera shall have one RJ-45 for Ethernet. 2. The camera shall have one analog video out BNC connector for

installation only. 3. The camera shall have short or DC 5V activation alarm input. 4. The camera shall have one relay out (input rating maximum 1 A,

24 VAC/VDC). 5. The camera shall have one line in jack connector for audio input. 6. The camera shall have one line out jack connector for audio output.

H. Electrical:

1. The camera shall accept either +12 VDC, +24 VAC or Power over Ethernet (48 VDC nominal).

2. The camera shall conform to the IEEE 802.3af (802.3at Type 1) compliant Power over Ethernet network. Power level: Class 3.

3. The camera shall consume 6 W (max.). I. Access Security:

1. The camera shall offer three levels of password protection. 2. The camera shall support 802.1x authentication using a RADIUS

(Remote Authentication Dial In User Service) server. 3. The camera shall store an SSL certificate for use with HTTPS.

J. Recording and Storage Management:

1. The camera shall support iSCSI devices to allow video stream to be recorded directly to an iSCSI RAID array.

2. The camera shall support iSCSI storage targets to enable the camera to function as a conventional DVR.

3. The camera shall have an SD card slot that uses standard, off-the-shelf SD cards for local storage (up to 2TB).

4. The local storage feature shall be capable of storage for Automatic Network Replenishment (ANR).

5. Local Recording: Continuous recording, ring recording, alarm/events/schedule recording.

K. Alarm Handling Features:

1. The camera shall provide the capability on alarm to display up to a 31 character, programmable alarm message.

2. The camera shall provide email alarm messaging with optional JPEG posting.

L. Embedded Video Content Analysis: 1. The camera shall be VCA enabled. 2. The camera shall be capable of processing and analyzing video within

the camera itself, with no extra hardware required. 3. The camera shall be capable of detecting and sending alarms for

abnormal events. 4. The camera shall allow users to set up to 10 separate profiles and

switch profiles based on a day/night or holiday schedules. 5. The camera shall offer Essential Video Analytics that uses an

Intelligent tracker to follow objects within the defined regions of interest.

M. Environmental:

1. The camera shall operate in a -20°C to +50°C (-4°F to +122°F) temperature range.

2. The camera can be stored in a -30°C to +70°C (-22°F to +158°F) temperature range.

3. The camera can be operated/stored in 0% to 90% relative humidity (non-condensing).

N. Mechanical: 1. The camera dimensions shall be:

a. Diameter 135 mm (5.32 in.). b. Height 102 mm (4 in.).

2. The camera weight shall be 450 g (0.99 lb) approx. 3. The camera shall have 3-axis adjustment (pan/tilt/rotation), plus

zoom. 4. The camera color is RAL 9003 and RAL 9017.

2.3 Accessories

A. Mounts: 1. BUB-CLR-FDO Clear polycarbonate bubble for dome camera. 2. BUB-TIN-FDO Tinted polycarbonate bubble for dome camera. 3. NDA-5031-PIP Interface plate to mount a camera to a pendant or

pipe, white; for indoor use. 4. NDA-U-WMT Universal wall mount for dome cameras, white. 5. NDA-U-PMT Universal pipe mount for dome cameras, 31 cm, white. 6. NDA-U-PMAS Universal pole mount adapter, white; small. 7. NDA-U-PMTE Extension for universal pipe mount, 50 cm, white. 8. NDA-U-PSMB Surface mount box (SMB) for wall mount or pipe

mount. 9. NDA-FMT-DOME In-ceiling flush mounting kit for dome cameras

(Ø157 mm). 10. NDA-ADT4S-MINDOME Surface mount box (Ø145 mm / Ø5.71

in) for dome cameras (use together with the appropriate dome adapter bracket).

11. NDA-U-CMT Universal corner mount, white. 12. NDA-U-WMP Back plate for universal wall mount, corner mount and

pole mount, white. 13. LTC 9230/01 Flat Roof Mount Adapter for mounting a unit in an

upright position on a flat surface. 14. NDA-U-WMT Universal wall mount for dome cameras, white. 15. NDA-U-PMAL Universal pole mount adapter, white; large.

B. Other:

1. NBN-MCSMB-03M 0.3 m (1 ft) analog cable, SMB (female) to BNC (female) to connect camera to coaxial cable.

2. NBN-MCSMB-30M 3 m (9 ft) analog cable, SMB (female) to BNC (male) to connect camera to monitor or DVR.

3. UPA-1220-60 Power supply for camera. 100-240 VAC, 50/60 Hz In; 12 VDC, 1 A Out; regulated. Input connector: 2-prong, North American standard (non-polarized).

4. NPD-5001-POE Power-over-Ethernet midspan injector for use with PoE enabled cameras; 15.4 W, 1-port.

5. NPD-5004-POE Power-over-Ethernet midspan injectors for use with PoE enabled cameras; 15.4 W, 4-ports.

6. VJT-XTCXF High-performance video transcoder. H.264; CF card slot; ROI; max resolution 1080p; 2 channels.

7. S1460 2.5 mm jack to BNC video connector cable. 1 m. PART 3 – EXECUTION 3.1 EXAMINATION

A. Examine areas to receive devices and notify adverse conditions affecting

installation or subsequent operation. B. Do not begin installation until unacceptable conditions are corrected.

3.2 PREPARATION

A. Protect devices from damage during construction. 3.3 INSTALLATION

A. Install devices in accordance with manufacturer’s instruction at locations indicated on the floor drawings plans.

B. Ensure selected location is secure and offers protection from accidental

damage.

C. Location must provide reasonable temperature and humidity conditions, free from sources of electrical and electromagnetic interference.

3.4 FIELD QUALITY CONTROL

A. Test snugness of mounting screws of all installed equipment. B. Test proper operation of all video system devices.

C. Determine and report all problems to the manufacturer’s customer service

department. 3.5 ADJUSTING

A. Make proper adjustment to video system devices for correct operation in accordance with manufacturer’s instructions.

B. Make any adjustment of camera settings to comply with specific

customer’s need. 3.6 DEMONSTRATION

A. Demonstrate at final inspection that video management system and devices function properly.

END OF SECTION

CLOSED CIRCUIT TELEVISION CAMERA SPECIFICATIONS (OUTDOOR)

PART 1 – GENERAL 1.1 REFERENCES

A. European Norm: 1. EN 50121-4:2006 Railway Applications - Electromagnetic

Compatibility - Part 4: Emission And Immunity Of The Signaling And Telecommunications Apparatus.

2. EMC directive 2004/108/EC. 3. EN 50130-4:1995+A1:1998+A2:2003 (CE) Alarm Systems, Part 4 –

Electromagnetic Compatibility – Product Family Standard: Immunity Requirements for Components of Fire, Intruder and Social Alarm Systems.

4. EN 50130-5: Alarm Systems, Part 5 – Environmental Test Methods (corresponds with VDE 0830 parts 1-5).

5. EN 50132-5-2: Alarm systems - CCTV surveillance systems for use in security applications - Part 5-2: IP Video Transmission Protocols.

6. EN 55022, Class B – Information Technology Equipment – Radio Disturbance Characteristics – Limits and Methods of Measurement for Emission.

7. EN 55024 Information technology equipment. Immunity characteristics. Limits and methods of measurement.

8. EN60950-1 – Safety of information technology equipment (IT Equipment)

9. CE Declaration of Conformity. 10. CB scheme.

B. Federal Communications Commission (FCC) (www.fcc.gov): 1. FCC CFR 47 part 15; subpart B, Class B Digital Devices.

C. International Electrotechnical Commission (IEC): 1. IEC 62676-2-3: Video surveillance systems for use in security

applications – Part 2-3: Video transmission protocols – IP interoperability implementation based on WEB services.

2. IEC 62471 (IR version): Photobiological safety of lamps and lamp systems.

D. International Organization for Standardization (ISO):

1. 9001: Quality System.

E. Underwriters Laboratories, Inc. (UL) (www.ul.com): 1. UL 60950-1 UL Standard for Safety of Information Technology

Equipment.

2. UL 60950-22 Information Technology Equipment – Safety - Part 22: Equipment to be installed outdoors.

F. Voluntary Control Council for Interference (VCCI):

1. VCCI J55022 V2/V3. 1.2 DEFINITIONS

A. Sensitivity: refers to the minimum level of light the sensor needs to generate an acceptable video picture, and is measured in lux.

B. Day/Night (infrared sensitive): The camera has normal color operation in situations where there is sufficient illumination (day conditions), but when there is little light available (night conditions) the sensitivity is increased by removing the infrared cut-off filter to provide a monochrome image.

C. iDNR (intelligent Dynamic Noise Reduction): The Intelligent Dynamic Noise Reduction applies temporal noise filtering when no motion is detected. The filtering reduces the noise in the image and this makes the encoder step more effective.

1.2 SYSTEM DESCRIPTION

A. Video Surveillance Remote Devices: 1. Fixed outdoor dome 2MP IR 3-10mm auto CCTV camera.

B. Performance Requirements:

1. Complete outdoor network video surveillance system inside a dome camera.

2. 1080p resolution. 3. Built-in active infrared illuminator. 4. Built-in Essential Video Analytics to trigger relevant alerts and quickly

retrieve data. 5. Intelligent Dynamic Noise Reduction (iDNR) technology. 6. Intelligent streaming technology for reduced bitrates. 7. H.264 and H.265 encoding. 8. Automatic varifocal 3 to 10 mm, DC Iris fixed board-mounted lens. 9. True day/night function. 10. Quad-streaming IP video. 11. Micro SDHC/SDXC card slot for edge recording up to 2 TB. 12. ONVIF conformant. 13. +12 VDC, +24 VAC and Power over Ethernet (IEEE 802.3af

compliant).

1.3 SUBMITTALS

A. Product Data:

1. Manufacturer’s data, user and installation manuals for all equipment and software programs including computer equipment and other equipment required for complete video management system.

B. Shop Drawings; include:

1. System device locations on architectural floor plans. 2. Full Schematic of system, including wiring information for all devices.

C. Closeout Submittals:

1. User manual. 2. Parts list. 3. System device locations on architectural floor plans. 4. Wiring and connection diagram. 5. Maintenance requirements.

1.4 QUALITY ASSURANCE

A. Manufacturer: 1. Minimum of 10 years’ experience in manufacture and design Video

Surveillance Devices. 2. Manufacturer’s quality system: Registered to ISO 9001 Quality

Standard.

B. Video Surveillance System 1. Listed by UL, EN and FCC specifically for the required loads. Provide

evidence of compliance upon request.

C. Installer: 1. Minimum of 5 years’ experience installing Video Surveillance Systems.

1.5 DELIVERY, STORAGE AND HANDLING

A. Deliver materials in manufacture’s original, unopened, undamaged containers; and unharmed original identification labels.

B. Protect store materials from environmental and temperature conditions

following manufacturer’s instructions.

C. Handle and operate products and systems according to manufacturer’s instructions.

D. Bosch provides off-the-shelf availability for our top selling products and

same-day or 24-hour shipping. 1.6 WARRANTY

A. Provide manufacturer’s warranty covering 3 years for replacement and repair of defective equipment.

1.7 MAINTENANCE

A. Make ordering of new equipment for expansions, replacements, and spare parts available to dealers and end users.

B. Provide factory direct technical support from 8:00 a.m. to 8:00 p.m. via

phone and e-mail. PART 2 – PRODUCTS 2.1 MANUFACTURERS

1. All proposed products must be approved by the African Development Bank Group’s Chief Regional Security Officer.

2. Proposed products must provide a line-by-line compliance documentation. 2.2 FIXED OUTDOOR DOME 2MP IR 3-10MM AUTO CCTV CAMERA

A. General Characteristics: 1. The camera shall be capable of operating in an indoor and an outdoor

environment. 2. The camera shall offer 1080p resolution at 16:9 aspect ratio. 3. The camera shall offer tamper detection and Essential Video Analytics. 4. The camera shall offer two-way full duplex audio communication. 5. The camera shall have a built-in active infrared illuminator (NDE-

4502-AL only). 6. The camera shall provide a CVBS (PAL/NTSC), 1 Vpp, BNC, 75

Ohm analog output that allows hybrid video output. 7. The camera shall utilize Intelligent Dynamic Noise Reduction (iDNR)

technology to reduce the bitrate and storage requirements by removing noise artifacts.

8. The camera shall offer Intelligent streaming possibilities. 9. The camera shall have a gyrosensor/accelerometer. 10. The camera shall provide eight independent, fully programmable

privacy mask areas. 11. The camera shall be easy to install.

B. Imaging Requirements: 1. The camera shall offer a 1/2.9-inch CMOS image sensor. 2. The camera shall offer a video resolution of 1080p@30fps. 3. The camera shall offer 1920 x 1080 sensor pixels. 4. The camera shall offer an upright video mode. 5. The camera shall be fitted with a board-mounted fixed varifocal 3 to

10 mm, DC Iris, F1.3 lens with a lens view angle of: a. 34° - 101° (Horizontal).

b. 19° - 54° (Vertical). 6. The camera shall have a wide dynamic range of 85 dB. 7. The camera shall have high sensitivity in color (0.12 lx) and in

monochrome (0.02 lx). The camera shall offer a minimum sensitivity of 0.0 lx in IR mode.

8. The camera automatic electronic shutter shall offer a shutter speed of 1/30 (1/25) to 1/15000.

9. The camera shall be capable of capturing and storing images using the following compression standards: a. H.265 MP. b. H.264 MP. c. M-JPEG.

C. Network Video:

1. The camera shall provide direct network connection using H.265, H.264 and M-JPEG compression and bandwidth throttling to efficiently manage bandwidth and storage requirements while delivering outstanding image quality.

2. The camera shall allow full camera control and configuration capabilities over the network.

3. The camera shall deliver video, at rates up to 30 images per second, via TCP/IP over a 10/100 Base-T, auto-sensing, half/full duplex, RJ45 Ethernet connection.

4. The camera shall support AutoMDIX. 5. The camera shall conform to the ONVIF Profile S and G standard. 6. The camera shall conform to protocols: IPv4, IPv6, UDP, TCP,

HTTP, HTTPS, RTP/RTCP, IGMP V2/V3, ICMP, ICMPv6, RTSP, FTP, Telnet, ARP, DHCP, SNTP, SNMP (V1, MIB-II), 802.1x, DNS, DNSv6, DDNS, SMTP, iSCSI, UPnP (SSDP), DiffServ (QoS), LLDP, SOAP, Dropbox, CHAP, Digest Authentication.

D. Audio:

1. The camera shall have line in and line out jack connectors for two-way, full duplex audio communication with audio compression AAC, G.711, L16 (live and recording).

E. Night Vision (Infrared):

1. The camera shall have a 10 LED high efficiency array (850 nm) for effective night vision up to 30 m (98 ft).

F. Control:

1. The camera shall be configured via a web browser or PC surveillance software.

G. Connectors:

1. The camera shall have one RJ-45 for Ethernet.

2. The camera shall have one analog video out BNC connector for installation only.

3. The camera shall have short or DC 5V activation alarm input. 4. The camera shall have one relay out (input rating maximum 1 A,

24 VAC/VDC). 5. The camera shall have one line in jack connector for audio input. 6. The camera shall have one line out jack connector for audio output.

H. Electrical:

1. The camera shall accept either +12 VDC, +24 VAC or Power over Ethernet (48 VDC nominal).

2. The camera shall conform to the IEEE 802.3af (802.3at Type 1) compliant Power over Ethernet network. Power level: Class 3.

3. The camera shall consume 8.5 W (max.).

I. Access Security: 1. The camera shall offer three levels of password protection. 2. The camera shall support 802.1x authentication using a RADIUS

(Remote Authentication Dial In User Service) server. 3. The camera shall store an SSL certificate for use with HTTPS.

J. Recording and Storage Management:

1. The camera shall support iSCSI devices to allow video stream to be recorded directly to an iSCSI RAID array.

2. The camera shall support iSCSI storage targets to enable the camera to function as a conventional DVR.

3. The camera shall have an SD card slot that uses standard, off-the-shelf SD cards for local storage (up to 2TB).

4. The local storage feature shall be capable of storage for Automatic Network Replenishment (ANR).

5. Local Recording: Continuous recording, ring recording, alarm/events/schedule recording.

K. Alarm Handling Features:

1. The camera shall provide the capability on alarm to display up to a 31 character, programmable alarm message.

2. The camera shall provide email alarm messaging with optional JPEG posting.

L. Embedded Video Content Analysis:

1. The camera shall be VCA enabled. 2. The camera shall be capable of processing and analyzing video within

the camera itself, with no extra hardware required. 3. The camera shall be capable of detecting and sending alarms for

abnormal events. 4. The camera shall allow users to set up to 10 separate profiles and

switch profiles based on a day/night or holiday schedules.

5. The camera shall offer Essential Video Analytics that uses an Intelligent tracker to follow objects within the defined regions of interest.

M. Environmental:

1. The camera shall operate in a -40°C to +50°C (-40°F to +122°F) temperature range.

2. The camera can be stored in a -40°C to +70°C (-40°F to +158°F) temperature range.

3. The camera can be operated/stored in 0% to 90% relative humidity (non-condensing).

4. The camera shall offer IP66 ingress protection. 5. The camera shall offer IK10 impact protection.

N. Mechanical:

1. The camera dimensions shall be: a. Diameter 145 mm (5.71 in.) b. Height 131 mm (5.14 in.).

2. The camera weight shall be 1102 g (2.43 lb) approx. 3. The camera shall have 3-axis adjustment (pan/tilt/rotation), plus

zoom. 4. The camera color is RAL 9003 and RAL 9017.

2.3 Accessories

A. Mounts: 1. BUB-CLR-FDO Clear polycarbonate bubble for dome camera. 2. BUB-TIN-FDO Tinted polycarbonate bubble for dome camera. 3. NDA-5030-PIP Interface plate to mount a camera to a pendant or

pipe, white; for outdoor use. 4. NDA-U-WMT Universal wall mount for dome cameras, white. 5. NDA-U-PMT Universal pipe mount for dome cameras, 31 cm, white. 6. NDA-U-PMAS Universal pole mount adapter, white; small. 7. NDA-U-PMTE Extension for universal pipe mount, 50 cm, white. 8. NDA-U-PSMB Surface mount box (SMB) for wall mount or pipe

mount. 9. NDA-FMT-DOME In-ceiling flush mounting kit for dome cameras

(Ø157 mm). 10. NDA-ADT4S-MINDOME Surface mount box (Ø145 mm / Ø5.71

in) for dome cameras (use together with the appropriate dome adapter bracket).

11. NDA-U-CMT Universal corner mount, white. 12. NDA-U-WMP Back plate for universal wall mount, corner mount and

pole mount, white, IP66. 13. LTC 9230/01 Flat Roof Mount Adapter for mounting a unit in an

upright position on a flat surface. 14. NDA-U-WMT Universal wall mount for dome cameras, white.

15. NDA-U-PMAL Universal pole mount adapter, white; large. 16. NDA-U-RMT Universal roof mount for dome cameras, white.

B. Other: 1. NBN-MCSMB-03M 0.3 m (1 ft) analog cable, SMB (female) to BNC

(female) to connect camera to coaxial cable. 2. NBN-MCSMB-30M 3 m (9 ft) analog cable, SMB (female) to BNC

(male) to connect camera to monitor or DVR. 3. NDN-IOC-30M An IP66 certified cable for easy waterproof

installation. 4. UPA-1220-60 Power supply for camera. 100-240 VAC, 50/60 Hz In;

12 VDC, 1 A Out; regulated. Input connector: 2-prong, North American standard (non-polarized).

5. NPD-5001-POE Power-over-Ethernet midspan injector for use with PoE enabled cameras; 15.4 W, 1-port.

6. NPD-5004-POE Power-over-Ethernet midspan injectors for use with PoE enabled cameras; 15.4 W, 4-ports.

7. VJT-XTCXF High-performance video transcoder. H.264; CF card slot; ROI; max resolution 1080p; 2 channels.

8. NDA-U-PA0 Power supply box, no transformer, IP66. 9. VG4-A-PSU0 Power supply, 24 VAC input. White, aluminum

enclosure with cover, rated IP66 and IK 08. 100 W output. 10. VG4-A-PSU1 Power supply, 120VAC input, 24VAC output @ 96VA.

White aluminum enclosure with cover. IP66 ingress. IK10 impact. 11. VG4-A-PSU2 Power supply, 230VAC input, 24VAC output @ 96VA.

IP66 ingress. IK10 impact. 12. S1460 2.5 mm jack to BNC video connector cable. 1 m.

PART 3 – EXECUTION 3.1 EXAMINATION

A. Examine areas to receive devices and notify adverse conditions affecting installation or subsequent operation.

B. Do not begin installation until unacceptable conditions are corrected.

3.2 PREPARATION

A. Protect devices from damage during construction. 3.3 INSTALLATION

A. Install devices in accordance with manufacturer’s instruction at locations indicated on the floor drawings plans.

B. Ensure selected location is secure and offers protection from accidental damage.

C. Location must provide reasonable temperature and humidity conditions,

free from sources of electrical and electromagnetic interference. 3.4 FIELD QUALITY CONTROL

A. Test snugness of mounting screws of all installed equipment. B. Test proper operation of all video system devices.

C. Determine and report all problems to the manufacturer’s customer service

department. 3.5 ADJUSTING

A. Make proper adjustment to video system devices for correct operation in accordance with manufacturer’s instructions.

B. Make any adjustment of camera settings to comply with specific

customer’s need. 3.6 DEMONSTRATION

A. Demonstrate at final inspection that video management system and devices function properly.

END OF SECTION