Quality Assurance Handbook for Rural Roads Volume-I - pmgsy
Quality Assurance Handbook for Rural Roads Volume-I - pmgsy Quality Assurance Handbook for Rural Roads Volume-I - pmgsy
3. Section-1200 4. Provide 75 mm cement concrete wearing coat of M30 grade for isolated RCC slab bridges or submersible structures where specified. 5. Keep a cross slope of 2.5 percent for deck slab level in longitudinal profile for drainage and ensure curing earlier to prevent formation of shrinkage cracks. (b) Bearings and Expansion Joints 1. Provide only elastomeric bearings for RCC slab bridges of span length more than 10m conforming to IRC:83 part II. 2. Make provision for robust, durable, watertight and replaceable expansion joints, if needed. Such joints shall be designed site specific or adopted as shown in drawings. 3. Install deck joints in accordance with manufacturer’s recommendation. 4. For the specifications of filler joints, buried joints, compression seal joints and slab seal expansion joints refer to section 1200.7 of the MoRD Specifications for Rural Roads. (c) Railings/Parapets Bridge railings include portion of the structure erected on and above the kerb for the protection of pedestrians and traffic and constructed after the centering for falsework released. Adopt either metal or cast-in-situ concrete railings for RCC slab culverts and minor bridges as specified in the drawings. 1. Adopt all pipe sections and steel elements of railings, conforming to IS:1239 after galvanizing. 2. Adjust railings carefully prior to fixing in place, to ensure proper matching at abutting joints and correct alignment and camber throughout their length. 3. Protect all steel rail elements, pipe terminal sections, posts, nuts and both hardware and other steel fittings against corrosion, by galvanizing or painting. 4. Construct portion of the railing or parapet to be cast in place in accordance with the requirements for structural concrete as per Section 800 and reinforcement as per Section 1000. 5. For RCC slab culverts and minor bridges having overall length not exceeding 30 m, provide parapets of 400 mm thickness (minimum) in PCC of M15 or brick or stone masonry as shown in drawings. 6. Use forms of either single width board or line with suitable material duly approved. 7. Construct all mouldings, panel work and bevel strips as per drawings and finish all corners, true, sharp and clean cut. (d) Approach slabs 1. Approach slabs are not needed on culverts/or minor bridges having overall length not exceeding 30 m bridges and road pavement is continued in the full formation width between wing walls/ Returns. 2. When specified, adopt a minimum length of 3.5 m and minimum thickness of 300 mm for approach slab. Provide a 150 mm thick base in M10 concrete for approach slab. 172
173 Quality Assurance Handbook for Rural Roads 3. Provide 12 mm dia steel bars at 150 mm c/c in both directions at both top and bottom of approach slab and execute concreting work as per Section 800. (e) Drainage spouts 1. Fix rigid drainage spouts of 100 mm dia, at a spacing not exceeding 10 m. 2. Use corrosion resistant material for drainage spouts. 3. Ensure suitable camber in the carriageway surface for transverse drainage. 4. Seal the shrinkage cracks around drainage assembly with polysulphide or bituminous sealant, after setting of deck slab concrete. (f) Filling Filling around culverts and bridges should be done with non-cohesive soils. (g) Sectional Details 1. For plain concrete structures, provide a minimum skin reinforcement of 2.5 kg/m 2 on all exposed surfaces in horizontal and vertical directions keeping a spacing not more than 200 mm in each direction. 2. For RCC approach slabs provide a reinforcement of 12 mm dia @ 150 mm c/c at both top and bottom side, in both the directions. 3. For structural steel RCC slab composite superstructures, provide haunches of 150 mm x 150 mm between top of steel girder and soffit of slab. Locate the sides of haunches 45 o from the outside edge of the base of the connections. B. Quality Control Requirements (1) Materials Table/Clause Bricks Table 600.4 Stones Tables 700.1 & 700.2 Cement Clause 602.2/702.2/802.2 Coarse aggregate Clause 802.3 Sand Clause 602.5/802.4 Water Clause 802.5 Steel Reinforcement Clause 1002 Structural Steel Clause 505 of IRC:24 Structural Concrete Table 800.2 to 800.12 Tolerance in Formwork As per B of Section 900 Polysulphide Sealant or Bituminous Sealant IS:1834
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173<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
3. Provide 12 mm dia steel bars at 150 mm c/c in both directions at both top and bottom of approach<br />
slab and execute concreting work as per Section 800.<br />
(e) Drainage spouts<br />
1. Fix rigid drainage spouts of 100 mm dia, at a spacing not exceeding 10 m.<br />
2. Use corrosion resistant material <strong>for</strong> drainage spouts.<br />
3. Ensure suitable camber in the carriageway surface <strong>for</strong> transverse drainage.<br />
4. Seal the shrinkage cracks around drainage assembly with polysulphide or bituminous sealant,<br />
after setting of deck slab concrete.<br />
(f) Filling<br />
Filling around culverts and bridges should be done with non-cohesive soils.<br />
(g) Sectional Details<br />
1. For plain concrete structures, provide a minimum skin rein<strong>for</strong>cement of 2.5 kg/m 2 on all exposed<br />
surfaces in horizontal and vertical directions keeping a spacing not more than 200 mm in each<br />
direction.<br />
2. For RCC approach slabs provide a rein<strong>for</strong>cement of 12 mm dia @ 150 mm c/c at both top and<br />
bottom side, in both the directions.<br />
3. For structural steel RCC slab composite superstructures, provide haunches of 150 mm x 150 mm<br />
between top of steel girder and soffit of slab. Locate the sides of haunches 45 o from the outside<br />
edge of the base of the connections.<br />
B. <strong>Quality</strong> Control Requirements<br />
(1) Materials Table/Clause<br />
Bricks Table 600.4<br />
Stones Tables 700.1 & 700.2<br />
Cement Clause 602.2/702.2/802.2<br />
Coarse aggregate Clause 802.3<br />
Sand Clause 602.5/802.4<br />
Water Clause 802.5<br />
Steel Rein<strong>for</strong>cement Clause 1002<br />
Structural Steel Clause 505 of IRC:24<br />
Structural Concrete Table 800.2 to 800.12<br />
Tolerance in Formwork As per B of Section 900<br />
Polysulphide Sealant<br />
or Bituminous Sealant<br />
IS:1834
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