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Pipe Culvert.ppt

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  PIPE CULVERT ByCH. VENKATARAMAIAH  (1)  A pipe culvert is normally proposed where a canal with adischarge of 1 cumec to 1.5 cumec crosses the village/Z. P / R & B roads. In case the number of rows of pipes exceeds  ‘ 2 ’  the pipe culvert may not be economical. In such cases the slab culvert may be economical. Theculvert shall be with full formation width of road as perIRC recommendation.  (2) Pipe(i) Maximum & Minimum diametre of pipe: The maximum diameter of pipe should be 1200 mm and minimum diameter should be 750 mm. It shall bedesigned to function as partially flowing with thevelocity not more than 2 times the normal canal velocity. (ii) Class of pipe:  NP3 class (reinforced concrete, medium  –  duty, non pressure pipe), conforming to I.S 458  –  2003 / 1988. (iii) Minimum Earth cushion:  Minimum earth cushion over the pipes shall be 600 mm.  (3) Bedding: Irrespective of load coming on the pipe, they shall bebedded in a cradle constructed of concrete having mix not leaner then M 15 grade. Thickness of concrete below the pipe should be ¼  th of internal diameter of pipe and on the sides the concrete should extend to ¼  th of external dia. Figure AFigure A
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