Specification Part 3 - Road & Bridge Works - Urban Administration ...

1901. DESCRIPTION
This work shall include furnishing, fabricating, transporting, erecting and painting structural
steel, rivet steel, cast steel, steel forgings, cast iron and other incidental metal construction of the kind,
size and quantity in conformity with the drawings and these specifications or as desired by the
Engineer.
1902. GENERAL
General requirements relating to the supply of material shall conform to the specifications of IS:
1387, for the purpose of which the supplier shall be the Contractor and the purchaser shall be the
Engineer.
Finished rolled material shall be free from cracks, flaws, injurious seams, laps, blisters, ragged
and imperfect edges and other defects. It shall have a smooth and uniform finish, and shall be
straightened in the mill before shipment. They shall also be free from loose mill scale, rust, pits or other
defects affecting its strength and durability.
The acceptance of any material on inspection at the mill i.e. rolling mills, foundry or fabricating
plant where material for the work is manufactured, shall not be a bar to its subsequent rejection, if found
defective.
Unless specified otherwise, high tensile steel rivet conforming to IS: 1149 shall be used for
members of high tensile steel conforming to IS:961 and shall not be used for mild steel members.
Unless specified otherwise, bolted connection of structural joints using high tensile friction grip
bolts shall comply with requirements of IS:4000.
Cast iron shall not be used in any portion of the bridge structure, except where it is subject to
direct compression.
1903. MATERIALS
1903.1. All materials shall conform to Section 1000. Special requirements are given below :
Mild steel for bolts and nuts shall conform to IS:226 but have a minimum tensile strength of 44
kg/sq. mm. and minimum percentage elongation of 14. High tensile steel for bolts and nuts shall
conform to IS:961 but with a minimum tensile strength of 58 kg/sq. mm. High strength friction grip bolts
shall be permitted for use only on satisfactory evidence of performance to the requirements (not
covered by these specifications) specified by the Engineer or included in the special provisions.
For cast steel, the yield stress shall be determined and shall not be less than 50 per cent of the
minimum tensile strength.
Plain washers shall be of steel. Tapered or other specially shaped washers shall be of steel, or
malleable cast iron.
Parallel barrel drifts shall have a tensile strength not less than 55 kg/sq. mm. with elongation of
not less than 20 per cent measured on a gauge length of 4VSo (So = cross sectional area).
1903.2. Materials for castings and forgings, fasteners and welding consumables shall be as under :
1903.2.1. Castings and Forgings : Steel castings and forgings shall comply with the requirements of the
following Indian Standards, as appropriate :
IS:1030
IS: 1875
IS:2004
IS:2644
IS:4367
Carbon Steel Castings for General Engineering purposes
Carbon Steel Billets, blooms, slabs, bars for forgings
Carbon Steel Forgings for General Engineering purposes
High Tensile Steel Casings
Alloy & tool steel forgings for general industrial use
1903.2.2. Fasteners : Bolts, nuts, washers and rivets shall comply with the following or relevant IS
Standards as appropriate :
IS:1929 Hot forged steel rivets for hot closing (12-36mm dia)
IS:2155 Cold forged steel rivets for hot closing (6-16mm dia)