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-1300 A-3 Toe Protection The toe wall shall be in dry RR matting conforming to the Clause 1302.5 of MORD Specifications for Rural Roads or as per drawings. Toe protection shall be done by constructing a toe wall, retaining/breast wall or close bamboo walling at the junction of embankment slope and general ground level, to protect the embankment from damages. 1. Use dry rubble or brick masonry for toe walls. 2. While using bamboo walling, examine the ballies of 65mm to 75mm dia from a distance of 1.2m from wider end. Paint the entire length in coal tar. 3. Choose lengths between 1.2m and 3m and drive the ballies into the ground at close intervals of 150 mm c/c. Use atleast three half split runner/stays at equal spacing for horizontal stiffness and fix them with nails. 4. Line the exposed surface of bamboo walling with sheets made of cut drums and fix with nails. A-4 Rubble Stone/Brick flooring 1. Where specified provide rigid flooring under culverts and extend for a minimum distance of 1.5 m on upstream side and 3m on downstream side or as shown in drawings. 2. Excavate trench for laying foundation of bed protection and lay 150 mm thick cement concrete of M10 grade, so as to commence paving work. 3. Where rubble stone is specified as flooring, carryout the work with flat stones 150 mm thick, which are bedded on a 25 mm thick layer of 1:5 cement mortar. Fill the joints with 1:3 cement mortar. 4. Where bricks are to be used, carryout the work on 150 mm thick brick on edge, with each layer of brick bedded on 25 mm thick 1:5 cement mortar. Fill in the joints with 1:3 cement mortar. 5. Keep the top of flooring 300 mm below the lowest bed level and extend the flooring. Extend the line connecting the end of splayed wing walls on either side of the culvert/bridge. 6. Adopt dry rubble stone/brick flooring at CD works where the velocity of flow is less than 1.5 m/ sec by keeping the top of flooring 300 mm below the low bed level. 7. Lay the rubble stones closely, breaking joints and fill all joints with spalls of proper size and wedged in with rammers to ensure tight packing. 8. When dry brick is to be used, follow the procedure as above on a prepared base and lay in one or more layers. Ensure proper bond. A-5 Curtain wall Enclose flooring by curtain walls in cement concrete (M 10) or stone/brick masonry in cement mortar 1:4 and take to a depth of atleast 1.5 m on u/s side and 2 m on d/s side below the floor level. A-6 Chute drain, Roadside drain, Hillside drain, Catch water drain 1. Provide rectangular or trapezoidal chute drains of specified dimensions in sections of road embankment, of height more than 8 m at minimum 10 m intervals. Provide them in embankment 182
183 Quality Assurance Handbook for Rural Roads slopes in approaches of bridges and on horizontal curves connected at the tow of the embankment with parallel open drains discharging into a nearby nallah or CD work. 2. Locate the open drain at the toe of embankment far away from at imaginary slope of 4 (horizontal) : 1 (vertical). 3. Construct hill side drains as per clause 1606.1 of the MORD Specifications for Rural Roads. 4. Build catch water /intercepting drains on hill slopes to intercept water flooring from upper reaches and guide such flow into culverts. Adopt trapezoidal shape and line them. 5. Refer to IRC:SP:42 ‘Guidelines on Road Drainage’ for more details and design of section. A-7 Protection of Vented Causeways and Submersible Bridges Damages to submerged structures occur due to out flanking at one or both banks, heavy erosion on downstream side, collapse of headwalls and washing of paved surface. The design of such structures is inter woven taking protection aspects into consideration. 1. For vented causeways, prepare the stream bed crossing by stabilizing with crushed stone, riprap or rubble after removal of silt and compact the base and core to reduce future settlement. 2. Provide side drains on either side along the side slopes which are rubble pitched. Take the side drains at least 10 m away from the edge of main causeway junction, to meet the stream proper. 3. Provide face walls to protect the edges of the structure and to prevent erosion of core material. Build face walls of the approaches strong enough to avoid damage during floods. Seal the joints in concrete face walls to prevent ingress of water to the core. 4. Make the approaches of causeways in Cement Concrete pavement laid over WBM or in Stone Set pavement, to prevent their damage due to frequent over topping. 5. In case of submersible bridges, provide bed protection for the whole bed-width of water course plus 3 m on both sides. 6. Provide a minimum foundation depth of 1.5 m on u/s side and 2.5 m on downstream side for cut off wall. 7. In the case of submersible bridge, anchor the deck slabs of span length (
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183<br />
<strong>Quality</strong> <strong>Assurance</strong> <strong>Handbook</strong> <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong><br />
slopes in approaches of bridges and on horizontal curves connected at the tow of the embankment<br />
with parallel open drains discharging into a nearby nallah or CD work.<br />
2. Locate the open drain at the toe of embankment far away from at imaginary slope of 4 (horizontal)<br />
: 1 (vertical).<br />
3. Construct hill side drains as per clause 1606.1 of the MORD Specifications <strong>for</strong> <strong>Rural</strong> <strong>Roads</strong>.<br />
4. Build catch water /intercepting drains on hill slopes to intercept water flooring from upper reaches<br />
and guide such flow into culverts. Adopt trapezoidal shape and line them.<br />
5. Refer to IRC:SP:42 ‘Guidelines on Road Drainage’ <strong>for</strong> more details and design of section.<br />
A-7 Protection of Vented Causeways and Submersible Bridges<br />
Damages to submerged structures occur due to out flanking at one or both banks, heavy erosion<br />
on downstream side, collapse of headwalls and washing of paved surface. The design of such<br />
structures is inter woven taking protection aspects into consideration.<br />
1. For vented causeways, prepare the stream bed crossing by stabilizing with crushed stone, riprap<br />
or rubble after removal of silt and compact the base and core to reduce future settlement.<br />
2. Provide side drains on either side along the side slopes which are rubble pitched. Take the side<br />
drains at least 10 m away from the edge of main causeway junction, to meet the stream proper.<br />
3. Provide face walls to protect the edges of the structure and to prevent erosion of core material.<br />
Build face walls of the approaches strong enough to avoid damage during floods. Seal the joints<br />
in concrete face walls to prevent ingress of water to the core.<br />
4. Make the approaches of causeways in Cement Concrete pavement laid over WBM or in Stone Set<br />
pavement, to prevent their damage due to frequent over topping.<br />
5. In case of submersible bridges, provide bed protection <strong>for</strong> the whole bed-width of water course<br />
plus 3 m on both sides.<br />
6. Provide a minimum foundation depth of 1.5 m on u/s side and 2.5 m on downstream side <strong>for</strong> cut<br />
off wall.<br />
7. In the case of submersible bridge, anchor the deck slabs of span length (
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