整理u现浇重力式钢筋混凝土挡土墙.docx
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整理u现浇重力式钢筋混凝土挡土墙.docx
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整理u现浇重力式钢筋混凝土挡土墙
现浇重力式钢筋混凝土挡土墙
Castinplacegravityreinforcedconcreteretainingwall
Constructiontechnologystandards(VIII,124)
1scopeofapplication
Thisstandardisapplicabletotheconstructionofcastinplacereinforcedconcreteretainingwallforhighway,urbanroadandbridge.
2constructionpreparation
2.1materials
2.1.1cement:
generallyusePortlandcement,ordinaryportlandcement,slagPortlandcement.Cementapproachshouldhaveproductcertificationandinspectionreport,dealwiththestrength,stabilityandotherperformanceindicatorsafterenteringthenecessarysamplingreexamination,thequalitymustbeconsistentwithcurrentnationalstandards"Portlandcementandordinaryportlandcement"GB175.Whenthereisanydoubtaboutthequalityofthecementorthecementisoutofproductionformorethanthreemonths,thereexaminationmustbeconductedbeforeuseandtheresultshallbeusedasaresultoftheretest.Differentkindsofcementshallnotbeusedincombination.
2.1.2sand:
generallyusemediumandcoarsesand.Sandvarieties,qualityshouldbeconsistentwithcurrentnationalstandard"technicalspecificationforconstructionofhighwaybridgesandculverts"JTJ041,afterenteringthecountryinaccordancewiththeprovisionsofthecurrentstandard"testmethodsofaggregateforHighwayEngineering"JTJ058samplingtest.
2.1.3:
weshouldusethehardstoneorpebblegravel,shouldaccordingtothedifferentsituationsoforigin,category,processingmethodsandspecifications,inaccordancewiththeprovisionsofthecurrentnationalstandard"testmethodsofaggregateforHighwayEngineering"JTJ058batchinspection,thequalityshouldbeconsistentwithcurrentnationalstandard"highwaybridgeculvertconstructiontechnologystandard"JGJ63regulations.
2.1.4water:
suitablefordrinkingwater.Whenusingotherwatersources,thewaterqualityshouldbeinlinewiththecurrentnationalstandard"waterstandardforconcretemixing",JGJ63.
2.1.5steel:
steelshallhavequalitycertificateandtestreportform;variety,level,specificationsofsteelbarsshouldcomplywiththedesignrequirements;thereinforcedapproachshouldbeselectedtodosampletestofmechanicalproperties,thequalitymustbeconsistentwithexistingnationalstandards,"thereinforcementofconcretehotrolledroundbar"GB13013,"thereinforcementofconcretehotrolledribbedbar"GB1499and"GB13788"coldrolledribbedsteelbarsandotherprovisions.
Chemicalanalysisorotherspecialtestsshallbecarriedoutwhenthesteelbarsarefoundtobebrittle,poorinweldabilityormechanicalpropertiesareabnormal.
2.1.6weldingelectrode:
theselectedelectrodeshouldbematchedwiththereinforcedbasematerial,andtheapproachshouldhaveacertificate.
2.1.7admixture:
additivesshouldbeproductmanuals,factoryinspectionreportsandcertificateofquality,performancetestingreport,thecontentofharmfulsubstancesshouldbetestedbythecorrespondingleveloftestingissuedbythetestingdepartment.Approachshallbereexaminedbysampling,andthesuitabilityofadmixtureandcementshallbechecked.Thequalityandapplicationtechnologyoftheadmixtureshallbeinlinewiththecurrentnationalstandard"concreteadmixture",GB8076andregulationsontheapplicationofconcreteadmixtures,GB50119.
2.1.8admixture:
theadmixtureshallhavethefactorycertificateorqualitycertificateandthequalityinspectionreportprovidedbythestatutoryinspectionunit,andshallbereexaminedaftertheapproach.Thequalityoftheadmixtureshallbeinaccordancewiththecurrentrelevantstandardsofthestate,andtheamountofadmixtureshallbedeterminedbyexperiment.
2.1.9embeddedpartsspecificationandmaterialshallcomplywiththedesignrequirements.
2.2implementsandequipment
2.2.
1machinery:
concretemixer,concretepump(pumpbyusing),concretemixertruck,hoistingmachine,cuttingmachine,bendingmachine,weldingmachine,crane,dumptrucks,scales,mobilegenerator.
2.2.2tools:
steelplate,trolley,scraper,level,foot,shovel,vibratorandsoon.
2.3operatingconditions
2.3.1themainstructureofthebridgeiscompletedortheelevationofthesubgradeishigherthantheelevationofthefoundationoftheretainingwall,andthecompactnesscanmeetthedesignrequirementsbeforeconstructioncanbecarriedout.
2.3.2baseacceptanceandcompletethehiddeninspectionprocedures.
2.4technicalpreparation
2.4.1theroadandbridgedesigndrawingsshallbecheckedbeforeconstruction,andthesurveyingpersonnelshallcalculatetheretainingwallplaneandGaoChengcontrolsurveyandconstructionsurveyaccordingtotheconstructionlineandtheGaoChengcontrolpointoftheroad,thebridgeconstructionlineandthecontrolpoint.
2.4.2completebreakdownofcommencementreport,concretetest,materialinspectionandexaminationandapprovalproceduresandrequirementsoftheowners,supervisionoftechnicaldocuments.
2.4.3preparationofconcreteretainingwallconstructionprogramhasbeenapproved,andrelatedpersonnelsafetytechnicaldisclosure.
3operationprocess
3.1process
Measurementline?
Cushionconstructionproductionandinstallationofreinforcedfoundation?
?
afoundationtemplatepouringconcretefoundation?
?
productionandinstallationofreinforcedwallandembeddedparts?
Supportedwalltemplate?
Pouringconcretewallandhealth?
3.2operationmethod
3.2.1measuringandlayingout:
accordingtoconstructiondrawingsandcoordinatepoints,releasetheretainingwallcenterline,thebasicplanepositionlineandverticalheightline,anddotheplaneandelevationcontrolpoints.
Constructionof3.2.2cushion
Thestrengthofthe3.2.2.1cushionconcreteshallcomplywiththedesignrequirements.
Whenthebottomofthe3.2.2.2cushionisnotatthesameelevation,theconstructionshallbecarriedoutinaccordancewiththefirstdeepandtheshalloworder.
Afterthecompletionoftheconstructionof3.2.2.3cushion,thedesignelevationshallbechecked,andtheaxisofthewall,thedimensiondimensionlineandthereinforcingbarcontrollineshallbeejectedaccordingtothedesigndrawingsandthemiddlelineoftheretainingwall.
Fabricationandinstallationof3.2.3basereinforcement
3.2.3.1shallbesubjecttoreexamination,verification,samplingandinspectionofthesteelinaccordancewiththerelevantprovisions,andmaybeusedafterqualification.
3.2.3.2reinforcementshallbestoredaccordingtovarietyspecification,batchnumberandclassification,andshallnotbemixed.Thereareseriouscorrosion,hemppit,split,sand,interlayer,oilandotherreinforcementmaynotbeused.
3.2.3.3thereinforcementshouldbecleanedbeforebinding,andthemainribsandthespacingofthetendonsshouldbedrawnwithchalkonthecushion.Accordingtothefirstrowspacing,placedreinforcement,reinforcementdistribution.Embeddedpartsandpreformedholeshouldbecombinedwiththeinstallationetc..
3.2.3.4bindingsteelbarusuallywiththebuckleoreightbutton,exceptfortheoutertwotendonsintersectionpointshouldbealltiedoutside,andtheotherpointscanbestaggeredbinding.
3.2.3.5inthesteelandtemplatepadcushionblock,spacingisnotgreaterthan1.5m,theprotectivelayerthicknessshouldcomplywiththedesignrequirements.
The3.2.3.6cushionblockisusuallymadeofcementmortar,andthethicknessofthecushionblockshouldbethesameasthethicknessoftheprotectivelayer.Theembeddedfirewireisembeddedinthecushionblockortheplasticcardisusedtoguaranteethethicknessoftheprotectivelayer.
3.2.3.7steelconnectionsshallbeweldedormechanicallyconnected.
3.2.3.8inbindingdoublelayersteelwiremesh,shouldsetenoughstrengthofsupportfeet,inordertoensuretheaccuratepositioningofsteelmesh.Stableandfirm,notlooseordeformedwhenpouringconcrete.
3.2.3.
9moldingsteelwelding,norust,greasebeforewelding;weldshallnotundercut,crack,slag,theskinshouldbecleanedup.
3.2.4foundationformwork
The3.2.4.1formworkshallhaveenoughstrength,stiffnessandstabilitytowithstandtheimpactofconcreteandthelateralpressureofconcrete.
3.2.4.2formworkshallensuretheshape,sizeandpositionoftheretainingwallaccurately,andbeeasytodisassemble.Thejointoftheformworkshallbetightandshallnotleakorstaggertheplatform.
3.2.4.3moldreleaseagentshouldbepaintedevenly,shallnotpollutethesteelbar.
The3.2.4.4axis,thetemplatelineiscompleted,shouldbedealtwithprescreeningprocedures.
3.2.4.5templateafterinstallation,shouldcheckthereservedholeandembedmentposition,meetthedesignrequirements,canbecarriedoutunderthestep.
Whenthe3.2.4.6formworkissupported,themouthofthetemplateshouldbehorizontalsupportfirstandthenbefixedbydiagonalbrace.
3.2.5pouringfoundationconcrete
3.2.5.1theconcreteshallbecheckedandacceptedbeforetheconcreteispoured.Templateinstallationisfirm,smooth,tightgap,debrisshouldbecleared,excludingthewater,andgothroughtheprescreeningprocedures.
3.2.5.2concretemixshallcomplywiththedesignstrengthrequirements.
3.2.5.3concretepouring,freefallisgenerallynotgreaterthan2m,whenlargerthan2m,theuseofpipeorchutetransport.
3.2.5.4castinplacegravityreinforcedconcreteretainingwallsshallbedeterminedaccordingtotheconcreteformandsizeofretainingwalls.Whenthefoundationandwallarearrangedinstages,thefollowingrequirementsshallbemet:
(1)thefoundationconcretestrengthabove2.5MPacansupportpartnerwallwalltemplate.
(2)thefoundationconcreteshallbelaidinthefoundationforsupportingandlocatingth
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