SABS 1200 DB-1989 管道土方

SABS1200DB-1989Earthworks(pipetrenches)63.63.6.13.6.23.6.33.6.43.74.4.14.24.35.5.15.1.15.1.25.1.2.15.1.2.25.1.2.35.1.3UATERIALSPORREINSTATEMENTOYROADSANDPAVEDAREASSubbaseandBase,Wheretrenchescrossorrunalongsurfacedroadsandpavedareasofwhichthesurfacesarescheduledtobereinstated,theContractorshallobtainprhorapprovalofsubbaseandbasematerialsthatmayberequiredtosupplementsuchmaterialslostduringercavation.Gravel.Wheretrenchescrossorrunalonggravelroadsofwhichthesurfacesarescheduledtobereinstated,theContractorshall,forthepurposeofreinstatement,separatelystorethetop300mmofmaterialexcavated.BituminousConstruction.Materialsforbituminousconstructionshallcomplywiththeapplicablerequirementsoftheappropriateofthefollowingspecifications:Primer.........................................SABS748orSABS749Cutbackbitumensoremulsions.....................SABS308orSABS309Coarseaggregate(stonechips)....................SAEG1083AsphaltCarpet.Anasphaltcarpetshallconsistofeitherofthefollouinqmixes:a)6,7mmcoarseaggregate(stonechips)..........100partsbymass,plusRC250cutbackbitumen.........................7partsbymassofemulsionpremixGrade60bitumenemulsion8partsbymassofemulsionorb)6,7mmcoarseaggregate(stonechips)..........100partsbymass,plus...............SELECTION.TheContractor,inadditiontocomplyingwith5.4,shallnotwastefullydisposeofexcavatedmaterialthatcomplieswith3.3and3.4.TheContractorisnotrequiredtouseselectivemethodsofexcavatingbutmay,ifhesowishes,screen,washorotherwisetreatexcavatedmaterialinordertoproducematerialsuitableforthebedding.Heshalltakepositivestepstoavoidburyingorcontaminatingmaterialswhichotherwisewouldbesuitableforuseasa)selectedfillfortheblanketorselectedgranularmateiialforthecradle,unlessothermaterialshavebeenspecified,orb)topsoil,orc)roadmaterialsforre-useintermsof5.9.whenotherwisesuitablematerialfromatrenchiscontaminated,theContractorshall,tomakeupanyshortfall,obtain(athisownexpenseifthecontaminationisduetohismethodsofworking)suitablematerialfromotherexcavationsontheSite,orbyopeningupborrowpits,orbyimportingfromcommer-cialorothersources.Subjecttotherequirementsof3.5,hardrockandboulder13fromexcavationsthatconformtotheclassificationgiveninSubclauses3.1.2(c)-(e)(inclusive)ofSABS1200DorSubclauses3.1.2(c)-(e)(inclusive)ofSAES1200DA,asapplicable,shallbeincorporatedinthebackfill.TheEngineermydirectthatthematerialbesuitablymixedwithotherbackfillmaterial.PLANTEXCAVATIONEQUIPMENT.TheContractormayusetrenchingplantthatwillexcavatetoawidthsuchthatthesideallowancedoesnotexceedtheappropriatevaluespecifiedin5.2bymorethan50X,exceptthatwhere,intermsoftheprojectspecificationorofthedrawings,thebasewidthofatrenchforapipelineoraportionofapipelineisnottoexceedtheminimumbasewidthorastatedvalue,theContractorshallusetrenchingplantthatwillproducetherequiredtrenchwidthorheshallacceptresponsibilityforallcostsincurredinstrengtheningtherelevantpipeline.CONTROLOFWATER.TheContractorshalluseappropriatetechniquesorprovideplantsuchaspumps,wellpointsandsheetingorclosetimberingforkeepingthetrenchessufficientlyfreefromwatertoenablehimtolaypipestruetolineandlevelandtobedthemsoundly,allasspecifiedinthisspecification(see5.1.2).COMPACTIONEQUIPMENT.TheContractormayusemechanicalcompactionequipmentbutheshallselectsuchequipmentandoperateitinsuchamannerthatthepipeline,ductorcableisnotstressedordamaged.MachinecompactionshallnotbeuseddirectlyabovethepipeuntilsufficientbackfillhasbeenplacedtoensurethatmachinecompactionloadstransmittedtothetopOFthepipearenogreaterthanwouldbeimposedbynonnalroadtrafficoverapipelinewithcoverofdepth600mm.CONSTRUCTIONPRECAUTIONSGeneral.TherequirementsofSubclause5.1ofSABS1200DorSubclause5.1ofSABS1200DA,asapplicable,shallapplyinadditiontotherequirementsof5.1.2below.__---Stormwater,SeepageandDewateringofExcavationsThroughouttheWorks.IndealingwithwaterasrequiredintermsofSubclause5.5ofSABS1200AorSubclause5.3ofSABS1200AA,asapplicable,andSubclause5.1.3ofSABS1200DorSubclause5.1.4ofSABS1200DA,asapplicable,theContractorshall,subjectonlytosuchparticularitemsasarescheduledfordesignatedhazardsintermsof5.1.2.2,properlyandadequatelyprotecttheWorksfromfloodinganddamagebystormwater,flowfromsprings,andseepage.Specialwaterhazards.TheEngineermayscheduleparticularitemsfordealingwithaspecialwaterhazardatadesignatedpointorinadesignatedpartottheWorksandasrequiredintermsoftheprojectspecification(see8.3.2and8.3.4(b)).Slopingground.Inthecaseofatrenchonslopingground,theContractorshalltakeapprovedmeasures(suchastheconstructionofcross-embankments)tominimizeerosioninthetrenchandadjacentgroundfromwhichvegetationhasbeenremoved.AccoemodationofTrafficandAccesstoProperties.Wheretheworkaffectstheoperationorsafetyofpublictraffic,a)inadditiontocomplyingwiththerelevantrequirementsofSubclause5.1.6ofSABS1200DorSubclause5.1.8ofSABS1200DA,asapplicable,theContractorshall1)constmctorputinordersuchbypaes(e6)asmayberequiredtodeviatetrafficfromportionsoftheroadthataretobeaffectedbytheconstruction;or2)wherehalf-widthconstructionisorderedorapproved(asinthecaseofmostdirectcrossingsofroads),soar