Concrete Pipe & Box Culvert Installation - Shaw Precast Solutions

TRENCH BEDDING CIRCULAR PIPE(INCHES)Notes:For Class A bedding, use d as depth ofconcrete below pipe unless otherwiseindicated by soil or design conditions.For Class B and C beddings, subgradesshould be excavated or over excavated,if necessary, so a uniform foundationfree of protruding rocks may be provided.Special care may be necessary with Class Aor other unyielding foundations to cushionpipe from shock when blasting can beanticipated in the area.DenselyCompacted Backfill12" min.Plain orReinforcedConcrete 12,000 psi min.1/4 Bcd (see notes)1-1/4 BcBc+8" min.BcCONCRETE CRADLECLASS AReinforced A s = 1.0% B f = 4.8Reinforced A s = 0.4% B f = 3.4Plain B f = 2.8Bc0.6 BcSHAPED SUBGRADE WITHGRANULAR FOUNDATION12" min. 12"DenselyCompactedBackfillCompactedGranular MaterialFine Granular FilldMaterial 50mm min.BcGRANULAR FOUNDATIONLooseBackfillBc0.5 BcSHAPED SUBGRADEBcFLAT SUBGRADECLASS DB f = 1.11/8 H6" min.1/8 H6" min.CLASS BB f = 1.9LightlyCompactedBackfill1/8 H6" min.Compacted GranularMaterial or DenselyCompacted Backfill1/6 BcdBcGRANULAR FOUNDATIONDepth of BeddingMaterial Below PipeDd(min)27" & smaller 3"30" to 60" 4"66" & larger 6"LegendB c = outside diameterH = backfill cover above top of pipeD = inside diameterd = depth of bedding materialbelow pipeA s= area of transverse steel in thecradle of arch expressed as apercentage of area of concreteat invert or crown32American Concrete Pipe Association • www.concrete-pipe.org