A causeway means the passage of standing
water to road side drainage system which has been provided to drain off the
rain water standing on the main roads. The causeways have been constructed by
providing cut through green belt and providing an appropriate camber (as 2%
here) to the service road. The cut in
the green belt has been provided in the direction of the flow of water for the
purpose of quickly drain off and no standing of rain water. The cut has been
provided inclined where the flow of rain water is from one direction and provided
straight where the flow is from both direction along with kerb. The construction steps which have been
followed are: -
- Excavation of service road and removal of the excavated materials with the help of JCB where causeway has to be provided. And the cut in the green belt in the proper direction has been made with JCB. The site has been properly cleared.
- The levelling for causeways has been done to provide a camber of 2% by holding the levelling staff at both edge and centre of service road at that section and sighted by a dumpy level.
- The RCC kerb stones along the edge of cut, provided in green belt, have been manually placed and cemented by using mortar of 1:4 cement sand ratio. The base of cut provided has been concreted properly by using concrete of proportion 1:4:8.
- After that the WMM layer has been laid on the excavated part of the service road and compaction has been done by Static Roller. After compaction of the WMM layer, prime coat and tack coat has been applied for binding purpose of WMM, DBM and BC layers. The upper layer has been paved and compacted by Static Roller until the impression removed. The quality of work has been maintained as per IRC.
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