traffic signage_scope of works and technical specifications_pdf

8/10/2019 Traffic Signage_Scope of Works and Technical Specifications_pdf

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Technical Specifications

Technical Specifications for Materials(2009 DPWH Road Signs and Pavement Markings Manual)

A. 10. Materials for Sign Face

Any materials used for the sign face, and not otherwise described in this specification, shall be

in accordance with the approved standard specifications as described in the following sub-

sections:

A. 10.1. Retro-Reflective Materials

Where reflectorization is required the retro-reflecting materials shall comply with theestablished standards for retro-reflective materials and devices for road traffic

control purposes.

The ref lective sheeting shal l be weather resistant and show no apprec iable, cracking,

blistering, crazing or d imensional change after two (2) years of unprotected outdoor

exposure.

The reflective sheeting shall have high reflectivity normal to vehicle headlight

dependent on the angle of incidence. The reflective material shall be sharp, no glare

and directed towards the light source of approved angle of inc idence.

The reflective sheeting shall perform effectively for a minimum of seven (7) years

from date of fabrication.

The reflective sheeting must retain at least 70% (Type 1) & 50% (Type 2) of its

original brightness for regular and fluorescent sheeting respectively at the end of

seven (7) years. All signs used for road projects should be warranted by the sheeting

manufacturer for above- stated performance.

Signs must be dated at the time of delivery in order to initiate the 7-year

performance warranty. A sign dating sticker that indicates the manufacturers name,

material type/brand name with the month and year of delivery should be placed atthe back of the sign face.


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The ref lective sheeting to be used maybe of two (2) types:

Type 1- High Performance Reflective Sheeting

Type 1 materials to be used for all overhead signs, signs related to movement of

pedestrians, chevron alignment signs and s igns identified as black spot areas. The

ref lective sheeting shall consist of full cube micro-prismatic lens sheet ing with an

interlocking d iamond seal pattern with pre-coated adhesive backing protected by a

removable liner. The minimum reflective brightness value of reflective sheeting

shall be in accordance with the following table:


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Type 2 Medium Performance Reflective Sheeting

Type 2 materials to be used as minimum standards for al l other types of signs not

qualified for use under Type 1. The reflective sheeting shall consist of non-

metalized micro-prismatic lens in an interlocking d iamond pattern encapsulated by

a f lexible transparent plastic film that has a smooth outer surface. The sheeting

shall have a pre-coated adhesive protected by an easily removable liner. The

adhesive shall have a pressure-sensitive adhesive of the aggressive tack type

requiring no heat , solvent or other preparation for adhesion to surfaces.

The minimum ref lective brightness of reflective sheeting shall be in accordance with

the following table:


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A. 10.2. Fluorescent Reflective Sheeting

The fluorescent reflective sheeting shall consist of a visible-activated fluorescent

materials and full cube micro-pr ismatic lens sheeting w ith an interlocking diamond seal

pattern with pre-coated adhesive backing protected by a removable liner. The minimum

ref lective brightness shall be in accordance with the following table:

A. 11. Materials for Construction

Standard Road signs shal l be constructed with metal. The signs may have a dished,

rolled or beaded edge for additional rigidity. In order to stiffen larger signs and prevent damageby bending, horizontal battens or bars should be fixed to the rear of the signs as supports, and

may be ut ilized to provide mounting to posts.

Metal Signs

Metal s igns sha ll be of 2.00 mm thick aluminum substrate materials with stiffening as

provided.


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A. 12. Post and Attachments

Post requ ired for the erection of s igns shall be made of ga lvanized steel pipes not less

than 48.8 mm (outside diameter) x 3.25 mm thick, or other section of equivalent strength.

Wide flange posts and frames shall be fabricated from structural steel conforming to

ASTM A 283 Grade D. In lieu of wide flange steel posts, the Contractor may use tubular steel

posts conforming to ASTM A 501. All posts shall be thoroughly cleaned, free from grease, scale,

rusts and shall be given one coat of rust-inhibiting pr iming paint and two (2) coats of gray paint

in accordance with Ite m 411, Pa int DPWH Standard Specification.

Selection of non-frangible signpost lengths based on s ign panel s izes and post diameters

is given in Figure A.6. of the latest edition of the DPWH Road Signs and Pavement Markings

Manual.

Attachments shal l provide for the positive and robust connection of s igns to their

mount ing posts. Consideration shall be given to distributing attachment loads, e.g., by the

provision of a su itably shaped saddles and clamps or brackets for a round post. Detailed shop

drawings for the said illustrations shall be provided by the Supplier for approval of CDC.

For the larger s igns, the design of the sign support system as a whole shall take into

account possible wind loadings and the criteria spec ified in appropriate Philippine Code for

Structural Designs. A typical mounting sign is shown in Figure A.7.


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A. 13. Protective Treatment

All materials used for signs and sign supports shall be either resistant to, or protected

against deterioration under exposed paint system.

Where corrosion protection is destroyed or damaged in the manufacturing or fixing

process, steps shall be taken to restore protection by appropriate after-treatment.

Where d ifferent metals are in contact, appropriate action shal l be taken to prevent

galvanic action and resultant corrosion.

Approval of Prototype

The supp lier shall submit within Fifteen (15) calendar days upon effectivity of contract a sample

prototype of the said signage for approval of CDC for each type of typical signage (Sign Faceonly). No fabrication of the said signage would be undertaken unless said sample signage had

been approved for fabrication. The said prototype should be included in the bid cost.


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Priority Signs (R1)


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