ITEM 605 – ROAD SIGN
605.1 Description
This Item shall consist of furnishing and installing road signs in
accordance with this Specification and to the details shown on the Plans,
or as required by the Engineer.
The road signs shall comply in all respects with the “Philippine
International Road Signs Manual” published by the Department of Public
Works and Highways, Manila. The categories of road signs are designated in
the Manual, namely, danger warning signs, regulatory signs and informative
signs, or guide signs. These are referred to in the Contract as warning
signs and informatory signs, respectively.
Road signs shall be classified as standard or non-standard. Standard signs
consist of all warning signs, regulatory signs and informatory signs with
the exception of direction signs, place identification signs and the line.
Non-standard signs consist of all informatory signs which are not
classified as standard signs.
The size of warning and regulatory signs is the length of the side of
triangular signs (measured from the points of intersection of the extension
of the edges), the horizontal width of octagonal signs and the diameter of
circular signs.
605.2 Material Requirements
605.2.1 Sign Panels
Sign panels for warning, regulatory, and informatory signs shall be
manufactured from aluminum sheeting at least 3 mm thick.
605.2.2 Reflective Sheeting
The reflective sheeting used on the road signs shall consist of spherical
lens elements embedded within a transparent plastic having a smooth, flat
surface with a protected precoat adhesive which shall be pressure sensitive
for manual application, or tack free heat activated for mechanical
vacuum-heat application.
The minimum reflective brightness values of the reflective sheeting as
compared to a magnesium oxide (MgO) shall be as given in Table 605.1. The
brightness of the reflective sheeting totally wet by rain, shall be not
less than 90% of the given values.
Table 605.1 – Reflective Brightness of Traffic Signs Surfaces
Color
|
Angle of Incidence
|
Angle of Divergence
|
Minimum Reflective Brightness Value Compared with MgO
|
Red
White
Yellow
Blue
|
-40
200
500
-40
200
500
-40
200
500
-40
200
500
|
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
|
15.0
10.0
3.0
75.0
70.0
70.0
35.0
35.0
10.0
6.0
4.5
0.5
|
The reflective sheeting shall be sufficiently flexible to permit
application and adhesion to a moderately embossed surface. It shall show no
damage when bent 900 over a 50 mm diameter mandrel.
The sheeting shall be solvent-resistant so as to be capable of withstanding
cleaning with petrol, diesel fuel, mineral spirits, turpentine methanol.
The sheeting shall show no cracking or reduction in reflectivity after
being subjected to the dropping of a 25 mm diameter steel ball from a
height of 2 m into its surface.
The adhesive shall permit the reflective sheeting to adhere accurately
48hours after application of temperatures of up to 900.
The reflective material shall be weather-resistant and, following cleaning
in accordance with manufacturer’s recommendations, shall show no
discoloration, cracking, blistering, peeling or any dimensional change.
Samples of reflective sheeting shall be submitted to the Engineer for
approval.
605.2.3 Posts and Frames
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 and rust and shall be
given one coat of rust-inhibiting priming paint and two coats of gray paint
in accordance with Item 411, Paint.
605.2.4 Nuts and Bolts
Nuts, bolts, washers and other metal parts shall be hot-dip galvanized
after fabrication in accordance with the requirements of AASHTO M 111.
605.2.5 Concrete Foundation Blocks
The concrete for the foundation blocks shall be Class A in accordance with
Item 405, Structural Concrete and shall be of the size shown on the Plans.
605.3 Construction Requirements
605.3.1 Excavation and Backfilling
Holes shall be excavated to the required depth to the bottom of the
concrete foundation as shown on the Plans.
Backfilling shall be carried out by using suitable material approved by the
Engineer and shall be compacted in layers not exceeding 150 mm in depth.
Surplus excavated material shall be disposed of by the Contractor as
directed by the Engineer.
605.3.2 Erection of Posts
The posts shall be erected vertically in position inside the formwork of
the foundation block prior to the placing of the concrete and shall be
adequately supported by bracing to prevent movement of the post during the
placing and setting of concrete. The posts shall be located at the
positions shown on the Plans.
605.3.3 Sign Panel Installation
Sign panels shall be installed in accordance with the details shown on the
Plans. Any chipping or bending of the sign panels shall be considered as
sufficient cause to require replacement of the panels at the Contractor’s
expense.
The exposed portion of the fastening hardware on the face of the signs
shall be painted with enamels matching the background color.
All newly erected traffic road signs shall be covered until ordered removed
by the Engineer.
605.4 Method of Measurement
The quantities of standard reflective warning and regulatory road signs
shall be the number of such signs of the size specified, including the
necessary posts and supports erected and accepted.
The quantities for standard reflective informatory signs and non-standard
reflective informatory signs shall be the number of such, including the
necessary posts and supports, erected and accepted.
605.5 Basis of Payment
The quantities measured as determined in Subsection 605.4, Method of
Measurement, shall be paid for at the contract unit price for the Pay Items
shown in the Bid Schedule which price and payment shall be full
compensation for furnishing and installing road signs, for excavation,
backfilling and construction of foundation blocks, and all labor,
equipment, tools and incidentals necessary to complete the Item.
Payment will be made under:
Pay Item No.
|
Description
|
Unit of Measurement
|
605 (1)
605 (2)
605 (3)
|
Warning Signs
Regulatory Signs
Informatory Signs
|
Each
Each
Each
|
Post a Comment