BS EN 752-3-1997 室外建筑物的排水系统.计划

BRITISHSTANDARDBSEN752-3:1997IncorporatingAmendmentsNos.1and2Drainandsewersystemsoutsidebuildings—Part3:PlanningTheEuropeanStandardEN752-3:1996hasthestatusofaBritishStandardICS93.030NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBSEN752-3:1997ThisBritishStandard,havingbeenpreparedunderthedirectionoftheSectorBoardforBuildingandCivilEngineering,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton15March1997©BSI01-2001ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceB/505/22Draftsforcomment92/14708DCand95/105617DCISBN0580267822CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbyTechnicalCommitteeB/505,Wastewaterengineering,toSubcommitteeB/505/22,Drainagesystemsoutsidebuildings,uponwhichthefollowingbodieswererepresented:AssociationofConsultingEngineersBritishPlasticsFederationClayPipeDevelopmentAssociationLtd.ConcretePipeAssociationDepartmentoftheEnvironmentDepartmentoftheEnvironment(PropertyandBuildingsDirectorate)FibreCementManufacturers’AssociationInstituteofBritishFoundrymenInstitutionofCivilEngineersInstitutionofWaterandEnvironmentalManagementMETCOMWaterServicesAssociationofEnglandandWalesThefollowingbodieswerealsorepresentedinthedraftingofthestandardthroughpanels.AssociationofBuildingEngineersBritishPumpManufacturers’AssociationInstituteofBuildingControlInstituteofPlumbingAmendmentsissuedsincepublicationAmd.No.DateComments10984October2000NationalannexNBupdated;Nationalforewordupdated.13038January2001CorrectiontotypographicalerrorsBSEN752-3:1997©BSI01-2001iContentsPageCommitteesresponsibleInsidefrontcoverNationalforewordiiForeword2TextofEN752-33NationalannexNA(informative)Materialsselection19NationalannexNB(informative)Accesstodrainsandsewers22TableNA.1—Materialsandproductscommonlyusedinsewerageconstruction20TableNB.1—Maximumspacingofaccessprovision22TableNB.2—Minimumdimensionsforroddingeyes,accessfittings,inspectionchambersandmanholes24TableNB.3—Recommendeddimensionsformanholesandmanholeshafts(personnnelentry)25--``,,,,```,`,`,,``,,``,`,``,,`-`-`,,`,,`,`,,`---BSEN752-3:1997ii©BSI01-2001NationalforewordThisPartofBSEN752hasbeenpreparedbySubcommitteeB/505/22andistheEnglishlanguageversionofEN752-3:1996,Drainandsewersystemsoutsidebuildings—Part3:Planning,publishedbytheEuropeanCommitteeforStandardization(CEN).ThispartwaspublishedasaresultofinternationaldiscussionandagreementinwhichtheUKtookanactivepart.ItwillbefollowedinduecoursebyParts4to7,aslistedintheforeword.TheBritishStandardsBS8005andBS8301arevalidforreferenceatthetimeofpublicationofthispart,buttheywillbereplacedbyNationalannexesshowingUKpracticepublishedwiththerelevantpartsofBSEN752.WhenallsevenpartsofBSEN752arepublished,BS8005andBS8301willbewithdrawnintheirentirety.AmendmentNo.1updatesthetextofNationalannexNB.ThisNationalannexwasbasedontraditionalpracticeasdescribedinBS8301andBS8005(standardswhicharenowobsolete).Ithasbeenrevisedtotakeaccountofdevelopmentsinthewaydrainsandsewersaremaintainedandchangesinhealthandsafetylegislation;itisthereforethepercursorofamendmentstoBritishStandardsspecifyingrequirementsformanholesandinspectionchambers.Anexplanationofthechangesfollows:Accessfittingsarecommonlyusedinbuildingdrainagebutnotinsewerage.Thereforeadescriptionhasbeenadded.Editorialchangeshavebeenmadetoimproveclarity.Healthandsafetylegislationrequiresthatmanualentrytodrainandsewersystemsisonlyundertakenwherenoalternativeexits.Thereforeuseofremotelyoperatedequipmentwillbecomethenormandadvantagehasbeentakenofitsflexibilitytoreducethecostofprovisionofaccessfacilities.Aswellasthetraditionalinspectionchambersusedfordepthsofupto1.0m,remotelyoperatedequipmentisavailableforinspection,cleaningandremovalofdebrisfromdeeperdrainsandsewers,withouttheneedforpersonalentry.Thereforeinspectionchamberscanbeusedonanydepthofdrain(subjecttothetypeofequipmenttobeused).However,todeterpersonnelentry,amaximumoperatingsizeisstatedfordeepinspectionchambers.Dimensionsofchambers,etc.,havebeensplitintotwotablesforclarity,onedealingwithmanholesandtheotherwithinspectionchambersandotherfittings.Sizesofmanholeshavebeenrationalized.Thesizesofmanholeslessthan1.5mdeephavebeenreducedtothewidthrequiredforthechannelplusbenching,asalargeropeningisconsideredamajorcriteriaforsafeworking.Sizesaregivenforagreaterrangeofpipesizes.Arequirementforatleast400mmwidthofbenchingatthefootofladdershasalsobeenintroduced.Sizesofmanholeshaftshavebeenincreasedinlinewiththeneedforaspaceof900mmbetweenthestepsorladderandthebackofthewall,requiredfortheuseofbreathingapparatusandprotectiveequipment.Referencetoaccessbyawinchhasbeenadded.Cross-referencesTheBritishStandardswhichimplementinternationalorEuropeanpublicationsreferredtointhisdocumentmaybefoundintheBSIStandardsCatalogueunderthesectionentitled“InternationalStandardsCorrespondenceIndex”,orbyusingthe“Find”facilityoftheBSIStandardsElectronicCatalogue.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectappl