Box and slab Culverts and Headwalls

Andhra Pradesh State Highways Project

Box and Slab Culverts and Headwalls__________________________________3200__________________________________

Box and Slab Culverts and Headwalls___________________________________________________________________________________

3201GENERALThe work shall consist of the supply of materials and installation of new or extension of existing slab and box culverts and headwalls for box pipe and slab culverts.

3202MATERIALS

All materials shall comply to the relevant sections of this specification. Granular fill beneath concrete in Culvert flooring shall be Class II filter material in accordance with Table 300-3.

3203MEASUREMENT FOR PAYMENTPayment shall be made for the following items :

Cement concrete m3HYSD Reinforcement tonnes

PCC beneath masonry foundations m3Masonry foundations m3Flooring to slab culvertsm23204RATEThe contract unit rates shall include full compensation for furnishing all labour materials, tools, equipment and incidental costs for completing the work. The rates shall include for all excavation, backfill, levelling and compaction of foundations, blinding and dewatering.

Where existing culverts are to be extended the rates shall include the clearing out of the existing culvert to the satisfaction of the Engineer and breaking back the existing structure to effect a bond with the new work as shown on the drawings or as directed by the Engineer.

The items for culvert headwalls and wingwalls will include painting the structure number in black letters 100 mm high on a yellow background, on the headwall in a location approved by the Engineer. The rate shall also include construction of all joints as shown on the Drawings.

The item for flooring to slab culverts shall include full compensation for excavation back filling, compaction of subgrade to 95% MDD (IS 2720 Part 8), 150 mm thick selected granular fill and 150 mm thick concrete flooring as detailed on the drawings.

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