cost estimation for slope remedial...

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COST ESTIMATION FOR SLOPEREMEDIAL WORKS

DATE : 27 APRIL 2016

VENUE : I-KPKT BUKIT TINGGI,PAHANG

TIME : 2.30PM – 4.30PM

PRESENTER : EN. HAZMAN B. AHMAD

OUTLINE

1. INTRODUCTION

2. SCOPE OF WORK FOR SLOPE

REMEDIAL WORK

3. PARAMETERS OF COST

ESTIMATION

4. EXTERNAL FACTOR OF COST

ESTIMATION

5. EXAMPLE OF COST ESTIMATION

6. CONCLUSION

1.0 INTRODUCTION1. Generally, slope remedial work will be carried

out on existing failed slope.2. Normally, the application of remedial work is

subjected to the suitability of site condition,such as the location of site, site difficulty, type offailure, soil profile, etc.

3. Thus, the cost of slope remedial at particularlocation might be differ with another location.

4. Cost estimation of the remedial work isnecessary to carried out to ensure the costapplied for the remedial in range with themarket value.

5. Cost estimation is an approximation of theprobable cost of a project on the basis ofavailable information.

6. A problem with a cost overrun can be avoidedwith a credible, reliable and accurate costestimate.

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DIAGRAM OF COST ESTIMATION

SCOPE OF REMEDIAL WORK

1. Preliminary Work

2. Earthwork (excavation & backfilling)

3. Slope Stabilization Work

4. Surface Protection Work

5. Drainage System Work

6. Road Work

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PRELIMINARY WORK

UTILITIES – Mapping/Relocation/SupplySITE FACILITIES - Site OfficeRequirement & Provision , etcTESTING - Prelim Test

Example

EARTHWORK (EXCAVATION &BACKFILLING)

Example

Photo example ofexcavation &

backfilling work

SLOPE STABILIZATION WORK

Stone pitching

Example of Rubble Wall & Stone pitching

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Example of Soil Nailing & Shotcrete


Example of Gabion Wall


Example of Crib Wall

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SURFACE PROTECTION WORK

Shotcrete

Hydroseeding

DRAINAGE SYSTEM WORK

ROAD WORK

Filling Chrusher Run Premix Work

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EXAMPLE BILL OF QUANTITY(Preliminary Work)

Bill No. 1: General Items and Preliminaries

All quantities are provisional

1 General Items and Preliminaries

1.1 Contractual Requirements

1.1.1 Allow for the provision of Performance Bond in the form of sum

approved Bank/Insurance Guarantee/Wang Jaminan

Perlaksanaan equal to five (5) percent of the Contract Sum

for performance and observance of this contract.

1.1.2 Allow for the provision of insurances as per condition sum

of contract.

i. Insurance of Works including insurance against personal

injuries and damaged properties.

ii. Workmen's Compensation and/or SOCSO.

1.2 Inspection and Testing

1.2.1 All quality control and testing requirements including preparation of sum

report, test records complete with colour photographs, throughout

the contract period.

1.3 Progress Report

1.3.1 Preparation and submission of monthly progress report including sum

traffic management report complete with colour photographs,

throughout the contract period.

1.4 As-Built Drawing

1.4.1 Allow for the preparation of as-built drawings and completion sum

report duly certified by licensed surveyor as per requirements

of the specification.

1.5 Work Programme

1.5.1 Allow for submission of Programme of Works prior to sum

commencement of works throughout the contract period.

1.6 Site Cleaning and Clearing

1.6.1 Allow for site cleaning and clearing of construction debris through sum

out the construction and upon completion of works and dispose

surplus from site to contractor's own tip.

1.7 Compliance With Statutory Requirements

1.7.1 Allow for Statutory Obligation including levy payment to the sum

Statutory Requirements and Lembaga Industri Pembinaan Malaysia

under Part VIII of the LPIPM Act 1994.

1.8 Contractor's Site Office and Accommodation

1.8.1 Allow for the establishment of the contractor's site office and sum

workmen's accommodation.

1.8.2 Allow for the maintenance of the contractor's site office sum

throughout construction period.

1.8.3 Allow for the removal of the contractor's site office on sum

completion of works.

Item Unit QuantityPrice/Unit

(RM)Amount(RM)

CADANGAN KAJIAN GEOTEKNIKAL DAN KERJA REKABENTUK TERPERINCI BAGI RUNTUHAN CERUN DI DEWAN FLATTAMAN MULIA, BANDAR TUN RAZAK, WILAYAH PERSEKUTUAN

CARRIED FORWARD



B/F

1.8.4 Provision of all costs incurred by complying with all safety, health sum

and welfare regulation orders or by laws relating to all work people

(personal protective equipments, etc.).

1.9 Mobilization and Demobilization

1.9.1 Allow for the mobilization of all labour, plant, equipment and sum

and incidentals necessary to satisfactorily perform the

contract works and demobilization of the same on completion

of works.

1.10 Survey and Setting Out Works

1.10.1 Provide setting out, levelling and checking of construction of sum

all works under the contract by a licensed surveyor.

1.11 Temporary Works

1.11.1 To provide temporary silt-sump/sediment traps,silt fence, earth drains, sum

etc, to contain possible spillage of silt to adjacent site and

to maintain during construction stage.

1.11.2 Supply, lay and maintain Grade A tarpaulin sheet for slope protection sum

during construction works as directed by the S.O.

1.11.3 Provide and maintain temporary access road from/to working sum

platform.

1.12 Miscellaneous

1.12.1 Allow sum for temporary relocation and/or other related protection sum

of utilities works due to construction as directed by the S.O.

1.13 S.O.'s Office Requirement

1.13.1 Provide, service and remove upon completion of work S.O.'s sum

site office (cabin) complete with air-cond. and necessary furnitures/

equipments as specified by S.O.

1.13.2 Allow maintenance for S.O.'s office as directed by S.O. sum

1.14 Site Office Provision

1.14.1 The contractor shall provide and maintain the following to the

approval and for the use of S.O and his staff within two (2)

weeks from the commencement date of the works until the

insurance of Certificate of Practical Completion by the S.O.:

1.14.1.1 Provide and maintain one (1) new computer facilities comprising sum

of laptop computer system including all accessories as specified

in Appendix 1B of the specification or requested by S.O.

1.14.1.2 Provide and maintain one (1) new digital camera with photografic sum

record as specified in Appendix 1A of the specification or requested

by S.O.

Item Description Unit QuantityPrice/Unit

(RM)Amount(RM)


CARRIED FORWARD



B/F

1.14.1.3 Provide and maintain safety equipments as per specified in sum

Appendix 1A or requested by S.O.

1.15 Project Signboard

1.15.1 Provide and maintain one (1) project signboard for the duration sum

of work and remove on completion of works.

Amount(RM)

TOTAL CARRIED TO SUMMARY


(RM)


EXAMPLE BILL OF QUANTITY(Earthwork, Slope Stabilization & Surface Protection)

Bill No. 2: Slope Remedial and Mitigation Works


2 Slope Remedial and Mitigation Works

2.1 Site Clearing

2.1.1 Clear and remove from site all obstacles over the areas for ha. 0.5

the construction of slope remedial and mitigation works

including trees, shrubs, roots, fences, existing road, structures

and utilities, and disposal of all materials to Contractor's

own dump site as directed by S.O.

2.1.2 Pruning and cutting all trees and dispose off the site including grubbing nr 7

of the tree's roots exceeding 2m girth for slope protection works.

2.2 Excavation & Trimming

2.2.1 Excavate by mechanical equipment to obtain formation level, load m3 6500

and transport unsuitable excavated material to contractor's own

dumping source.

2.3 Horizontal Subsoil Drain

2.3.1 Supply and install 75mm dia, 9m length horizontal subsoil drain m 126at 3m c/c spacing, consisting of perforated UPVC pipe wrappedwith a layer of non-woven geotextile as specified in drawing no.

2.3.2 Supply and construct cast in situ outlet drain made of Grade 25 nr 14concrete, inclusive reinforcement, as specified in Engineer'sdrawing no.

2.5 Soil Nail2.5.1 Supply and install T25, 6m length galvanized reinforcement steel nr 14

as soil nails complete with centralizers and grout injection (Grade

30 Concrete) through 100mm dia. Drill hole at 1.5m c/c spacing

as specified in Engineer's drawing and specification, in any

strata (rock or soil). Works also include supply and fix nail head

and all necessary works for proper completion inclusive

UPVC pipe as casing for soil nailing average length

as per drawing no.

2.5.2 Supply and install T25, 9m length galvanized reinforcement steel nr 50

as soil nails complete with centralizers and grout injection (Grade

30 Concrete) through 100mm dia. Drill hole at 1.5m c/c spacing

as specified in Engineer's drawing and specification, in any

strata (rock or soil). Works also include supply and fix nail head

and all necessary works for proper completion inclusive

UPVC pipe as casing for soil nailing average length

as per drawing no.

2.5.3 Allow for preliminary pull out test for soil nail as directed by the S.O nr 2

(Location to be determined on site)

2.5.4 Allow for pull out test for soil nail to 1.5 × Working Load as nr 2

specified in Engineer's specification.

2.4 Turfing

2.4.1 Close turfing on level surfaces including 50mm bed of black earth m2 5200

as specified in Engineer's drawing.

CADANGAN KAJIAN GEOTEKNIKAL DAN KERJA REKABENTUK TERPERINCI BAGI RUNTUHAN CERUN DI DEWAN FLAT TAMANMULIA, BANDAR TUN RAZAK, WILAYAH PERSEKUTUAN

Amount(RM)

CARRIED FORWARD


(RM)

Earthwork

Slope Stabilization

Surface Protection

EXAMPLE BILL OF QUANTITY(Road Work & Drainage Work)

Bill No. 2: Slope Remedial and Mitigation Works


B/F

4.8 Roadworks

4.8.1 Fill, spread, grade and compact 50mm thk. sand bedding as m3 30

specified in drawing and specification.

4.8.2 Fill, spread, grade and compact 300mm thk. crusher run material as m3 62

road base (compact to 95% max. dry density) as specified in

drawing and specification.

4.8.3 Supply and apply tack coat (Grade RC2) applied at a nominal spray m2 205

rate of 1.20 ± 0.1 litres per square meter.

4.8.4 Supply, lay and compact 60mm thk. Asphaltic Concrete Binder m2 205

Course (ACBC) as specified in drawing and specification.

4.8.5 Supply, lay and compact 40mm thk. Asphaltic Concrete Wearing m2 205

Course (ACWC) as specified in drawing and specification.

4.8.6 Supply all the materials and apply/re-apply reflective thermoplastic m2

marking (white), 200mm width single "Broken/Continuous RoadLine" as directed by S.O. or as specified in drawing.

4.6 Handrail4.6.1 Supply and install galvanised steel pipes handrail m 55

complete with post as specified along capping beam includingcutting, welding and painting.

CARRIED TO GRAND SUMMARY



(RM)Amount(RM)

Bill No. 3: Drainage Work


3 Drainage Work

3.1 Surface Drainage System

3.1.1 Supply and install cast in-situ Grade 25 concrete U-shape intercepter drain m 95

(type D1) top width not exceeding 600mm and depth to invert

not exceeding 300mm. Rate inclusive excavation, formwork, lean

concrete, demolished existing drain, reinforcement and removal

of surplus material. Refer drawing no.

3.1.2 Supply and install cast in-situ Grade 25 concrete V-shape berm drain m 104

(type BD1), top width not exceeding 600mm and depth to invert not

exceeding 300mm. Rate inclusive excavation, formwork, lean

concrete, demolished existing drain, reinforcement and removal

of surplus material. Refer drawing no.

3.1.3 Supply and construct U-shaped toe drain (type D2), m 300

top width not exceeding 1500mm and depth to invert not

exceeding 1200mm. Rate inclusive excavation, formwork, lean

concrete, demolished existing drain, reinforcement and removalof surplus material. Refer drawing no.

3.1.4 Supply and construct 600mm (W) × 600mm (D) U-shaped channel m 50cascade drain Type CD1 made of Grade 25 concrete as specified inEngineer's drawing. Rate include hacking-off, removal of existingdrains, excavation, lean concrete, reinforcement, formworks anddisposal of surplus material.

3.1.5 Supply and construct 750mm (W) × 750mm (L) × 750mm (D) nr 4reinforced concrete sump (Type A) made of Grade 25 concrete asspecified in Engineer's drawing. Rate include hacking-off, removalof existing sump, excavation, lean concrete, reinforcement,formworks and disposal of surplus material.

3.1.6 Supply and construct 1000mm (W) × 1000mm (L) × 1000mm (D) nr 5

reinforced concrete sump (Type B) made of Grade 25 concrete as

specified in Engineer's drawing. Rate include hacking-off, removal

of existing sump, excavation, lean concrete, reinforcement,

formworks and disposal of surplus material.

3.1.6 Upgrade existing drains, culverts, sumps and etc within residential area sum

as specified in the drawing and specification.


CARRIED FORWARD


(RM)Amount(RM)

Road Work Drainage Work

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3M 1P

1. Man Power

2. Materials

3. Machinery

4. Production

MAN POWER

1. Man power is person that probably involve to

complete the work.

2. It can be divide into few category such as:

I. Site Administration Staff

II. Machine Operator

III. Skill Worker

IV. General Worker

3. Number of worker need to be estimate to

ensure the work can be carried out efficiently

and match with production required.

4. The estimation of rate of salary for the workers

involve in particular work must be in range of

current market.

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MATERIALS

1. The materials required for the particular work

must be identified for quantity estimation

purpose

2. Quantity estimation

3. Rate of materials

MACHINERY

1. Type of machinery required must be listed

2. Number of machinery

3. Rate of rental

4. Duration required

5. Consumption for the used machinery must be

identified (fuel, diesel, maintenance)

PRODUCTION

1. Understand the process to carry out the work.

2. Estimation of completion per day.

3. Consideration of work delay possibility.

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EXTERNAL FACTOR

1. Type of remedial.

2. Location of site.

3. Difficulty of site.

4. Currency exchange.

5. Market value of construction materials and machinery

rental.

DOES THE EXTERNAL FACTOR

AFFECT THE COST ESTIMATIONFOR REMEDIAL WORK???...

YESHOW??..

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Type of remedial is one of the factor will be affect the cost

estimation because of:

1. Different work scope will be involve.

2. Different material will be used.

TYPE OF REMEDIAL

FACTOR OF LOCATION(Rate of Machinery)

Different rate of

machinery depend

on site location

(state).

Source: JKR

FACTOR OF LOCATION(Rate of Man Power)

Different rate of

man power

depend on site

location (state).

Source: JKR

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SITE DIFFICULTY(Limited Access to Failure Area)

Less of production perday will increase the

cost of operation work

House

Approximate2.5m

Approximate4.5m

SITE DIFFICULTY(Limited Work Space)

Need the highskill/experience manpower to carry out

the work.Working Area

House Working Area

House

Working Area

HouseWorking Area

PAPER CUTTING ON CURRENCYEXCHANGE

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PAPER CUTTING ON INCREAMENT OF MARKETVALUE FOR CONSTRUCTION MATERIALS

EXAMPLE OF COST ESTIMATION

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CONCLUSION

1. Cost estimation of slope remedial work must be carried

out to prevent the overrun of cost.

2. The estimator must experience on the market rate of man

power, materials and machinery.

cost estimation for slope remedial...

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