ConnectionofPrefabricatedConcreteComponentsPCBULIDINGCONSTRUCTIONLearntheSpiritofLubanBecometheCraftsmenoftheNationDigitalAssemblyIntelligence-builtFuture01ConnectionModeofPrefabricatedConcreteStructure02PrefabricatedConcreteStructureConnectionMaterialPCBULIDINGCONSTRUCTIONContentsCONTENTS01PCBULIDINGCONSTRUCTION01ConnectionModeofPrefabricatedConcreteStructureTaskanalysisKnowledgeobjectivesSkillgoalsLearntorecognizethetypesofconnectionmethodsofassembledconcretebuildingcomponents,connectionmaterials,qualityinspectionandcontrolofconnections,andotherrelatedknowledge.Mastertherelevantknowledgepointsofcast-in-situconnectionofprefabricatedconcretebuildingcomponentsBeabletocorrectlyidentifytheconnectionmodeandprincipleofdifferentprecastconcretecomponents01ConnectionModeofPrefabricatedConcreteStructure

PreschoolTaskAnalysis(1)ConnectionMethod-postConcretePost-pouredconcretereferstotheconcretecastonsiteintheconnectionareaorcompositelayerofprecastcomponentsaftertheinstallationofprecastcomponents.Inprefabricatedbuildings,thecast-in-placeconcreteinthefoundation,firstfloor,podium,topfloorandotherpartsiscalledcast-in-placeconcrete;Thecast-in-situconcreteattheconnectionandsuperpositionpartsiscalled"postcastconcrete".01ConnectionModeofPrefabricatedConcreteStructure(2)ConnectionStructure-ReinforcementConnectionReinforcementconnectionisthemostimportantlinkofpostcastconcreteconnectionjoint.Thereinforcementsconnectionstructureinthepostpouringareaincludes:1)Mechanical(threaded)sleeveconnection;2)Glueinjectionsleeveconnection;3)Reinforcementlapping;4)Reinforcementwelding,etc.01ConnectionModeofPrefabricatedConcreteStructure(3)JointSurfaceTreatment-----RoughSurfaceandKeywayThecontactsurfacebetweenprecastconcretecomponentsandpostcastconcretemustbemadeintoroughsurfaceorkeywaysurfacetoimprovetheshearresistance:1)Theroughsurfaceis"roughened"onthecalendaredsurface(suchasthesurfaceoflaminatedslabandlaminatedbeam)beforetheinitialsettingofconcrete,asshowninFigure1-1.Forthemoldsurface(suchasthesurfaceofbeamendandcolumnend),theretardercanbepaintedonthemold,andafterthemoldisremoved,theunsetcementslurrycanbewashedwithwatertoexposetheaggregateandformaroughsurface.；2)KeywayKeywayisformedbytheconvexandconcaveofthemold.AsshowninFigure1-2,thekeywayatthebottomoftheprecastcolumn.Figure1-1Figure1-201ConnectionModeofPrefabricatedConcreteStructure0101PCBULIDINGCONSTRUCTION02PrefabricatedConcreteStructureConnectionMaterial1)ReinforcementSleeveConnectingmaterialsarethematerialsandcomponentsusedfortheconnectionofprecastconcretestructures,includingreinforcementsleeves,groutingmaterials,sandwichfacadepanelties,etc.,allofwhicharethemostimportantspecialmaterialsforprecastconcretestructures:Metalsleeveswillbeusedfortheconnectionoflongitudinalreinforcementintheconcretepouringareaaftertheconnectionofprefabricatedconcretestructures,asshowninFigure2-1.Thestressedreinforcementsinthepostpouringareaadoptsthebuttjointconnectionmethod.That’stosay,theconnectingsleeveisfirstsleevedononereinforcement,andafterdockingwithanotherreinforcementinplace,thesleeveismovedtothemiddleoftworeinforcements,orthetworeinforcementsareconnectedbyscreworglueinjection.AsshowninFigure2-2and2-3Figure2-1Figure2-202PrefabricatedConcreteStructureConnectionMaterialFigure2-32)Grout-filledSleeveMaterialThesleevegroutingmaterialforreinforcementconnectiontakescementasthebasicmaterial,andismixedwithfineaggregate,admixtureandothermaterialstoformadrymixture.Afteraddingwaterandmixingaccordingtothespecifiedproportion,ithasthecharacteristicsoffluidity,earlystrength,highstrengthandmicroexpansionafterhardening:Theuseandperformanceofsleevegroutingmaterialshouldcomplywiththeprovisionsofthecurrentindustrialstandards"TechnicalCodefortheApplicationofRebarSplicingbyGrout-filledCouplingSleeve"(JGJ355─2015)and"RebarSplicingwithGrout-filledCouplingSleeveMaterial"(JG/T408─2013).Thetechnicalpropertiesofgrout-filledsleevematerialsaregiveninthetwoindustrystandards,asshownintable2-4.Figure2-402PrefabricatedConcreteStructureConnectionMaterial3)CorrugatedPipesinGrout-filledHolesThecorrugatedpipeingrout-filledholeisthematerialusedforlapping,whichisembeddedintheprecastconcretecomponenttoformtheinnerwallofthegrout-filledhole,asshowninFigure4-14.Whentheembeddedmetalbellowsisusedinthelappingconnectionofsteelgroutanchors,theperformanceofthemetalbellowsshallcomplywiththerelevantspecificationssuchasthecurrentindustrystandardsCorrugatedMetalDuctsforPre-stressedConcrete(JG225-2007),Cold-rolledSheetandStripofCarbonStructuralSteel(GB716-1991),andContinuouslyHot-dipZinc-coatedSteelSheetandStrip(GB/T2518-2008).Figure3-102PrefabricatedConcreteStructureConnectionMaterial4)PulpAnchorLapGroutingMaterialsThegroutingmaterialusedfortheslurryanchorlapisalsocement-basedgroutingmaterial,butitscompressivestrengthislowerthanthatofsleevegroutingmaterials.Becausethecompressivestrengthofthegroutanchorholewallislowerthanthatofthesleeve,thehighstrengthofthegroutingmateriallikethesleevegroutingmaterialisunnecessary.Article4.2.3oftheTechnicalSpecificationforPrefabricatedConcreteStructures(JGJ1-2014)givestheperformancerequirementsofthegroutingmaterialforthelapjointofthereinforcedmortaranchor,asshowninTable3-2.Figure3-202PrefabricatedConcreteStructureConnectionMaterial5)SittingSlurrySittinggroutisusedinthejointsatthebottomofmulti-layerprefabricatedshearwallstoreplacethegroutthere;itisalsousedinthegroutingpartitionisolationzone(alsocalledasbinsisolation)attheconnectionofprefabricatedwallpanelsofhigh-riseshearwallstructures.Thesettingslurryshouldhavegoodfluidity,earlystrength,noshrinkage,microexpansionandotherproperties.SeeTable3-3fortheperformanceindexesofcommonbedmortarmaterials.Figure3-3PrefabricatedConcreteStructureConnectionMaterial026)Grout-filledHoleisBoundwithSpiralReinforcement,GroutingConduit,HolePlugandJointPluggingMaterialsTheslurryanchorlapmethodisconstrainedbyspiralreinforcementaroundtheslurryanchorhole,andthematerialofspiralreinforcementsshouldmeettherequirementsofcorrespondingnationalstandards.Thediameterofreinforcement,diameterofspiralringandspiralspacingshallbedeterminedaccordingtothedesignrequirements.02PrefabricatedCconcreteStructureConnectionMaterial2.Grout-filledHolePlugThegroutingholeplugisusedtoblockthegroutingopeningandgroutoutletofthegroutingsleeveandgroutanchorhole,soastoavoidtheholechannelbeingblockedbyforeignmatters.Thegrout-filledholeplugcanbemadeofrubberorwood.3.GroutingCaulkingmaterialsGroutingcaulkingmaterialsareusedforthejointsofgroutingcomponents,includingrubberstrips,woodstripsandcaulkingquick-settingmortar.Thegroutingcaulkingmaterialisrequiredtosealthecaulkingtightlywithoutgroutleakageandbeoperatedeasily.1.GroutingConduitWhenthegroutingsleeveorgroutinganchorholeisfarawayfromtheedgeoftheconcrete,itisnecessarytoembedthegroutingconduitintheprefabricatedconcretecomponent.PVCmedium-sized(M-type)pipeswithapipewallthicknessof1.2mmaregenerallyusedasgroutingconduits,thatis,electricalcasing.Theouterdiameter,generally16mm,shouldbetheinnerdiameterofthegroutingoutletofthesleeveorgroutanchorhole..7)CoreInsulationComponentTiePieceSandwichfacadepanel,or"sandwich"panel,isafabricatedconcreteexteriorwallcomponentwithinsulationmaterialssandwichedbetweentwolayersofreinforcedconcreteslabs.Twolayersofreinforcedc