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首页 长螺旋钻机钻孔灌注桩的注意事项(Matters needing attention of bor…

长螺旋钻机钻孔灌注桩的注意事项(Matters needing attention of bored pile in long auger drilling machine).doc

长螺旋钻机钻孔灌注桩的注意事项(Matters needing…

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2019-01-08 0人阅读 举报 0 0 0 暂无简介

简介:本文档为《长螺旋钻机钻孔灌注桩的注意事项(Matters needing attention of bored pile in long auger drilling machine)doc》,可适用于社会民生领域

长螺旋钻机钻孔灌注桩的注意事项(Mattersneedingattentionofboredpileinlongaugerdrillingmachine)长螺旋钻机钻孔灌注桩的注意事项(Mattersneedingattentionofboredpileinlongaugerdrillingmachine)PointsforattentionofboredpileinlongspiraldrillDuringthedrillingoflongspiraldrillingmachine,theverticalityofdrillingmustbepaidattentionto,andthemaintechnicalmeasurestocontroltheverticalityofdrillingare:()compactionandlevelingofconstructionsite()installationofHenanSanlimechanicaldrillingrigshouldstrictlychecktheverticalityandflatnessandactivedrillingpipe,drillingprocessshouldregularlychecktheverticalityofKellybar,foundthatthedeviationshouldbeimmediatelyadjusted()checkthedrillbit,drillrodanddrillpipejointregularly,findproblemsandrepairorreplacethemintime()drillinginsoftandhardsoilinterfaceorinclinedrocksurfaceshouldbedrilledatlowspeedandlowpressureWhendrillingdeviationisfound,theclayshouldbebackfilledintimeandthendrilledatlowspeedandlowpressure()drillingincomplexformationsandinstallingasupportdeviceonthedrillpipewhennecessaryAttentionshouldbepaidtounderwaterconcretepouringprocesswhentheconcreteismadeofhighgradecement,attentionshouldbepaidtotherelationbetweentheinitialsettingtimeandthefinalsettingtimeoftheconcreteandthetimeofthegroutingofthesinglepile,andconcreteretardershallbeaddedifnecessaryThemixingratio(especiallythewatercementratio)andmixingtimeshallbestrictlycontrolledattheconstructionsiteGrasptheworkabilityofconcreteandslumpofconcretetopreventsegregationandblockageofconcreteinthecourseofpouringburiedpipedepthduringinitialgroutingTheprovisionsofChina'sJGJstandard,perfusioncatheteratthebottomtotheholebottomdistanceshouldbe~mm,earlyirrigationcatheterdepthshouldbegreaterthanorequaltommWhencalculatingtheinitialfillingamountofconcrete,theindividualconstructionunitonlycalculatestheamountofconcreteneededforthelengthofmpile,andcalculatestheamountofconcreteaccumulatedinthepipeTheinitialgroutingcapacityisnotenough,andtheburiedpipedepthisnotuptothestandardvalueOntheotherhand,thelengthofthepipespecificationconstructionunitsfortoolittle,theconduitpipinginstallationdifficulties,sometimescathetertotheholebottomdistanceistoolarge,andthecatheterinstallationpersonnelfailedtonoticetheactualdistanceofcastinplaceconcreteclass,formthefirstpouringamountduetoinsufficientdepthisnotuptothestandardvalueAtthebeginningofVshouldbedesignedaccordingtotheamountofconcretefillingpilediameter,pipediameter,pipelength,installationholemuddensityarecalculated,andVisnotlessthanVVVistheconcretequantityofmpilelength,V=*PID(unit:m)theoreticalfillingcoefficientofpilesDdesignpilediameter(m)Vistheconcretequantityaccumulatedintheearlyirrigationcatheter,V=(Hd)(PPId)(unit:m)lengthH(m)Dcatheterinstallationvesseldiameter(m)Pmudholedensity(tm)frictioncoefficienttheinnerwalloftheconduitconcretedensity(tm)concretefillingpipePluggingmainlybycatheterbreakingcausesoftheleakage,catheterendfromthebottomholedepthistoosmall,thecompletionofthetwoholecleaningafterpouringconcretefortoolongtime,waterhydrantisnotstandardized,concretepreparationquality,perfusioncatheterdepthistoolargecausedbypouringconcreteatThecatheterbeforeinstallationshouldbespecificallyresponsiblefortheinspection,thenakedeyeandmethodofcombiningbeathearingexamination,inspectionitemsaretheexistenceofjointcatheterholes,holesandcracksofthecatheterissealed,thethicknessofthecatheterisqualifiedIfnecessary,testthewaterpressurebyassemblingandcheckwhetherthecatheterleaksornotThedistancebetweenthebottomoftheperfusioncatheterandthebottomoftheholeshouldbebetweenandmm,andthemaximumvalueshouldbetakenasmuchaspossibleundertheconditionthattheinitialgroutingcapacityofthegroutingequipmentisenoughWaterhydranttobecarefullymade,itsdiameterandroundnessshouldmeettherequirements,itslengthshouldbelessthanmmAfterthecompletionofthesecondcleaning,theconcreteshallbestartedimmediatelyIftheconcreteisdelayedforsomereason,theholeshallbecleanedagainOtherwise,itmaycausethesandsuspensionintheholetosink,andmakethesedimentatthebottomoftheholetoothick,andcausetheblockageofthewaterseparationpipetoescapethepipeblockagepouringconcreteprocess,reinforcementcagefloatingTherearethreemainreasonsfortheriseofreinforcedconcretecageinpouringconcreteprocess:()theinitialsettingtimeandthefinalsettingtimeoftheconcretearetooshort,sothattheconcreteintheholeistooearlytoagglomerate,andwhentheconcretesurfacerisestothebottomofthereinforcingcage,theconcreteblockholdsthereinforcingsteelcage()whentheholecleaningthemudholesuspendedsandtoomuch,intheprocessofconcretepouringsandbacktosinkintheconcretesurface,theformationofsandlayerisdense,andwiththeholeintheconcreteincreasedgradually,whenthesanduptothesteelcagewhentheyholdatthebottomofthereinforcementcage()whentheconcreteispouredtothebottomofthereinforcingcage,thepouringspeedistoofast,andthereinforcingsteelcagerisesIfthereinforcementcagefloating,shouldimmediatelyidentifythecauses,andtakeappropriatemeasurestopreventrepeatedincidents,thepileconcretestrengthisloworconcretesegregationThemainreasonoflowstrengthofconcreteorsegregationofconcreteisthatconcretemixratioisnotstrict,mixingtimeisnotenoughandcementqualityispoorItisaneffectivemeasuretopreventtheconcretesegregationandstrengthofthepilebodytocontrolthequalityofthecemententeringthestorehousestrictly,controltheconcretemixproportionoftheconstructionsite,masterthemixingtimeandtheworkabilityoftheconcretepileconcreteslagorbrokenpileTherearefourmainreasonsfortheconcretepileorbrokenpileinthepilebody:()theamountofinitialconcreteisnotenough,thedepthofburiedpipeistoosmallaftertheinitialirrigation,orthepipeisnotintheconcrete()theconcretepouringprocess,thetubelengthcontrolisnotallowed,thecatheterdrawnoutoftheconcretesurface()theinitialsettingtimeandthefinalsettingtimeofconcretearetooshort,orthepouringtimeistoolong,sothattheupperpartofconcreteiscaking,resultinginconcreteslaginclusion()whentheholecleaningthemudholesuspendedsandtoomuch,intheprocessofconcretepouringsandbacktosinkintheconcretesurface,theformationofsedimentarysand,hinderthenormalriseinconcreteWhentheconcretebreakthroughthesedimentarysand,sandandsomescumencasedinconcreteInseriouscases,itmaycausepipeblockageandcausetheconcretetobeinterruptedThedepthoftheburiedpipeshallbecontrolledbetween~metersIfthegroutingissmoothandthemudoftheorificeisreturnedtonormal,theburiedpipedepthmaybeappropriatelyincreasedsoastoincreasethefillingspeedandshortentheconcretepouringtimeofthesinglepileTheconcretepouringprocessofextubationshouldbespecificallyresponsibleforthecommand,andrespectivelybytheoreticalcalculationofconcretepouredintotheholesurfaceandtheweightmeasuredholeconcretesurface,lowvaluetocontrolthelengthofthetube,ensurethecatheterdepthmorethanmetersThepouringtimeofsinglepileconcreteshouldbecontrolledattimestheinitialsettingtimeofconcretepiletopconcreteisnotdenseorstrengthisnotuptothedesignrequirements,themainreasonisthattheoverirrigationheightisnotenough,toomuchslurry,andtheconcretesurfaceoftheholeisnotdeterminedForthepilediameterislessthanmmoverfillingpile,thepilelengthheightofnotlessthanForthepilewithdiameter>mm,theheightofthegroutingisnotlessthanofthelengthofthepileForlargevolumeconcretepile,thepiletopmetersofconcreteshouldbeadjustedwiththeratioincreaseofgravelcontent,reducethepileheadlaitanceInthefinalstageofthegrouting,thedeterminationoftheconcretesurfaceintheholeshallbedeterminedbyrigidcylindersamplingmethod

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