Transcription of PRECAST CONCRETE MANHOLES
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PRECAST CONCRETE MANHOLES
PRECASTCONCRETEMANHOLESWHY PROVIDE GUIDELINES?Past Problems Was tedious to keep track ofvariables Was easy to make mistakes Wanted: A design tool to reduceproblemsTOPICS Overview on PRECAST MANHOLES Applications Design Procedures andApplicable Standards Watertight Structures Quality InstallationPRECAST CONCRETE MANHOLES Round Structures ASTM C478, StandardSpecification for PrecastReinforced ConcreteManhole Sections PRECAST CONCRETE MANHOLES Rectangle / Square Structures ASTM C913, StandardSpecification for PRECAST ConcreteWater and Wastewater Structures DO NOT Specify a Box Culvertfor a vertical application. BoxCulverts are designed forhorizontal installations andloading conditions. Specify ASTM C913 for SIZES Round ASTM C478 Internal Diameter ( ) 36 144 Check with localmanufacturer foravailability of largerdiameter box structuresare easily fabricatedusing universal SIZES Rectangle / Square ASTM C913 24 x 24 to 72 x 72 sizes increase by 6 incrementsMANUFACTURING METHODS Wet-Cast Cast with an inner and outer form.
PRECAST CONCRETE MANHOLES Round Structures • ASTM C478, “Standard Specification for Precast Reinforced Concrete Manhole Sections”
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