Designation:C478M−15aStandardSpecificationforCircularPrecastReinforcedConcreteManholeSections(Metric)1ThisstandardisissuedunderthefixeddesignationC478M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.PARTI—GENERAL1.Scope1.1Thisspecificationcoversthemanufactureandpurchaserequirementsofproductsusedfortheassemblyandconstruc-tionofcircularverticalprecastreinforcedconcretemanholesandstructuresusedinsewer,drainage,andwaterworks.1.2PartI,Sections1–11,ofthisspecificationpresentsgeneralrequirementsandrequirementswhicharecommontoeachprecastconcreteproductcoveredbythisspecification.1.3PartIIofthisspecificationpresentsspecificrequire-mentsforeachmanholeproductinthefollowingsections:ProductSectionGradeRings12FlatSlabTops13RisersandConicalTops14BaseSections15StepsandLadders16NOTE1—FutureproductswillbeincludedinPartIIinafuturerevisionofthisspecification.1.4ThisspecificationistheSIcompaniontoC478.NOTE2—Thisspecificationisamanufacturingandpurchasespecifica-tiononly,anddoesnotincluderequirementsforbackfill,ortherelation-shipbetweenfieldloadconditionsandthestrengthrequirementsofthemanholeproductsandappurtenances.Experiencehasshown,however,thatthesuccessfulperformanceofthisproductdependsupontheproperselectionoftheproductstrength,typeoffoundationandbackfill,andcareinthefieldinstallationofthemanholeproductsandconnectingpipes.Theowneroftheprojectforwhichtheseproductsarespecifiedhereiniscautionedtorequireinspectionattheconstructionsite.2.ReferencedDocuments2.1ASTMStandards:2A615/A615MSpecificationforDeformedandPlainCarbon-SteelBarsforConcreteReinforcementA706/A706MSpecificationforDeformedandPlainLow-AlloySteelBarsforConcreteReinforcementA1064/A1064MSpecificationforCarbon-SteelWireandWeldedWireReinforcement...
