Transcription of PRECAST CONCRETE PIPE
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PRECAST CONCRETE PIPE
PRECASTCONCRETE PIPEWHY PROVIDEGUIDELINES? Past problems. Was tedious to keep track of variables. Was easy to make mistakes. Wanted a design tool to Minimum Structure Size. Maximum Angle into RectangularStructures. Minimum Angle between Pipes enteringRound Structures. Minimum Pipe SIZE The PRECAST opening is typically 6 incheslarger than the pipe s outside 4-2ofStorm Drain HandbookAugust 2000 Values based on Openings for CONCRETE PipeMINIMUMSTRUCTURE SIZEM inimum DimensionsFor StructuresMaximum Angle (Skew) into aRectangular StructureMAXIMUM ANGLE (SKEW)INTO A RECTANGULAR STRUCTURE12 PRECAST Opening6 OD Pipe60 PRECAST Opening54 OD Pipe6 StructureWallStructure WallGood practice to allow 2" ofcontruction yRODPipeCos= CosODPipeR=RTolerance = PRECAST Opening R yMAXIMUM ANGLE (SKEW)INTO A RECTANGULAR STRUCTUREE xample:Given: 24 CONCRETE Pipe at 17 degree skew Structure Wall Thickness = 8 A 24 CONCRETE pipe has a 30 outsidediameter and a 36 PRECAST = PRECAST Opening R y = 36 (30 /Cos 17o) 8 x Tan 17o= MAXIMUM ANGLE (SKEW)INTO A RECTANGULAR STRUCTURET able 4-3 of Storm Drain Handbook August 2000 Values are based on 2 inches of construction tolerance,structures with 8-inch walls and CONCRETE pipe Round Structure or Rearrange Pipesif these Angles are Exceeded.
MINIMUM STRUCTURE SIZE • The precast opening is typically 6 inches larger than the pipe’s outside diameter. Opening Pipe
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