Quality Assurance Handbook for Rural Roads Volume-I - pmgsy

3. Section-1200
A2 Substructures
This item covers piers, abutments, wing walls, return walls, pier and abutment caps and RCC dirt
walls.
1. Adopt either Brick Masonry or Coursed Rubble (CR) Stone masonry or Plain or Reinforced Concrete
for piers, abutments and wing/return walls. For wing and return walls upto 3m height use Random
Rubble (RR) masonry.
2. Before commencing the masonry / concrete work, scrub the foundation with wire brush and
remove all loose material and wet the surface.
3. Make provision for weep holes in solid (non spill through) abutments and provide back fill.
4. Provide vertical expansion gaps of 20mm width between abutments and wing walls.
5. Provide coping for wing/return walls in plain concrete.
6. Provide dirt wall as per specification.
7. Provide RCC pier and abutment caps as shown on the drawings. For Slab bridges, cast surface of
pier and abutment caps and pedestals horizontal.
8. Provide RCC dirt wall with specifications of formwork, reinforcement and concrete as per Sections
800, 900 and1000.
A3 Superstructures
(a) Reinforced Concrete Solid Slabs
1. Set out dimension, lines and level and check with respect to permanent reference lines and
permanent bench marks.
2. Carry out RCC work conforming to the provision of formwork steel reinforcement and structural
concrete given in sections 900, 1000 and 800 respectively.
3. Where adjacent span of slab has already been cast in place, expansion joint and filler board abutting
the already cast span shall form the shutter for the adjacent span.
4. Cast whole of the slab with reinforcement embedded for road kerb and railings.
5. Use vibrators as per Table 800.12 for compaction of concrete.
6. Provide wearing coat after the deck slab has been cast true to lines and levels.
(b) RCC Box Cell
Choose box culvert when safe bearing capacity of soil is less than 150 kN/m 2 and when angle of
friction is less than 15 o .
1. Prepare M10 Grade cement concrete bearing surface as shown in drawings or clause 1203.4 of
MORD Specifications before construction of box cell.
2. Keep the top of the raft in bottom of box cell 300 mm below the lowest bed level.
3. Place the reinforcement cages in the shuttering as per drawings.
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