建筑工程灌注桩中英文对照外文翻译文献.docx
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建筑工程灌注桩中英文对照外文翻译文献.docx
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建筑工程灌注桩中英文对照外文翻译文献
中英文资料外文翻译文献
Boredpile
Summary
Drill(flushing,dig)pilefromthenineteensixties,beginninginHenanprovinceNanyangregionsincethedevelopmentapplication,becauseofitsmanyadvantages,hasbeenwidelyusedinsoftsoil,loess,includingsoil,expansivesoilandotherspecialtypesoffoundationandindustrial,civil,municipal,railway,highway,portandothertypesofEngineeringpractice.Andprecastpile,boredpileconstructionofnonoise,novibration,onthesurroundingbuildingsandsmallenvironmentalimpact,pilediameter,burieddeep,largebearingcapacity.China'sdrillingpilemaximumdiameterofpilehasreached4000mm,maximumdeeppilehasreached104m,andthesteelpipepilemaximumdiameterof1200mm,thelargestpileofprestressedconcretepipepilewithdeep83m,maximumdiameterof1300mm,thebiggestpiledepth40m.
Alongwithourcountrysocialistconstructionisbooming,withhigh-risebuildings,largespanbridgesontherise,thebearingcapacityofpilefoundationwithhigherrequirements.Largediameterboredpilethereforegetsrapiddevelopment,pilelengthandpilediameteralsodobiggermore.However,intheexistingvariousmethodsofpile,boredpilehasmanyadvantagesandiswidelyusedinconstruction,butitishardtoavoidtheimpactofmud,whichnotonlyreducesthebearingcapacityofpileexpectations,butalsocausedaseriouswasteofmaterials.Manualholediggingpileisdifficulttoachievegreaterdepth,itsbearingcapacityisalsodifficulttojustasonewishes.Inviewofboredpileinthissituation,howtoimprovethepileconstructiontechnologylevel,maketheinputmaterialtobemorereasonabletouse,soastogreatlyincreasethebearingcapacityofsinglepileinengineeringfield,havebecomehotissuesinrecentyears.
Theintroductionofboredcast-in-placepile
Perfusionpilereferstotheconstructionsitebymechanicaldrilling,steelpipesoilcompactionorhumanminingmethodinthefoundationpileholeinform,andonitsinnerplacedreinforcementcage,concretemadewithdifferentpile,drillingmethod,groutingpilecanbedividedagainforcast-in-placepile,boredpileanddiggingseveraltypesofpiles.Boredpilebypileintothedefinitionandclassificationofakindofpile.
Thecharacteristicsofboredcast-in-placepile
1、Andsinkingpileofhammeringmethod,constructionnoiseandvibrationissmaller
2、Toconstructthantheprecastpileoflargediameterofpile
3、Inallkindsofgroundcanbeused
4、Theconstructionqualityofthepilebearingcapacityinfluence
5、Becausetheconcreteisinthemudperfusionisdifficulttocontrol,sothequalityof
concrete
Boredpileconstructionmethod
Percussiondrilling,punchinggrabbingdrillingandrotarydrillingholecanadoptslurrywallconstructionmethod.Theconstructionprocessis:
siteformation,slurrypreparation,buriedtubeandlayingworkplatformrigandpositioning,drilling,holecleaningandinspectionofholequalityandlowersteelcage,underwaterconcreteperfusiontopulloutthebarreltocheckquality.Constructionsequence:
(1)theconstructionpreparation
Constructionpreparationcomprise:
selectingdrill,drill,layout.Constructionofboredpiledrillingrigisthemainequipment,accordingtothegeologicalconditionsandvariousdrillingmachineappliedtoselectconditions
(2)drillingmachineinstallationandpositioning
Istallationofdrillingmachinebasedifnotstable,easytoproduceinthedrillingmachineconstruction,pileandpileinclinedinclinedeccentricandotheradverseeffects,thereforerequirestheinstallationoffoundationstability.Ontheformationofsofter,slopingground,bebulldozed,thepadplateortiereinforcement.
Inordertopreventthepilepositionallowed,constructionisveryimportanttothesetthecenterpositionandthecorrectinstallationofdrillingmachine,therigdrillingmachine,firstuseofthepowerdrillandnearthecagewiththedrillpipe,movingroughlyposition,andthenJackrackjacking,accuratepositioning,sothattheliftingpulley,drillbitorfixeddrillholecardsandcasingcenterinaverticalline,inordertoensuretheverticalityofthedrillingrig.Drillingpositiondeviationisnotmorethan2cm.Alignedwiththepilelocation,withsleeperflatdrillbeamatthetopofthetower,andsymmetricaltothedrillaxispullingcablewindrope.
(3)buriedtube
UndergroundwaterlevelbelowtheKongBituunderthehydrostaticpressuretotheholecollapse,andeventhephenomenonofflowofsand.Ifyoucankeeptheboreholewallhighundergroundwaterhead,increasetheholehydrostaticpressure,topreventcollapsehole,holewall.Casinginadditiontoplaythisrole,atthesametime,goodisolationofsurfacewater,ground,protectingtheorificepileholedrillguidefixed
(4)slurrypreparation
Drillingmudiscomposedofwater,clay(bentonite)andanadditivecomposition.Afloatingdrillingwasteslagcoolingthedrillbit,drill,lubrication,increasinghydrostaticpressure,andintheholewalltoformaslurry,partitionwithintheboretopreventseepage,theholecollapseeffect.Modulationofthedrillingmudandcirculatingpurifyingmud,shouldbebasedonthedrillingmethodandformationconditionstodeterminetheslurryconsistency,slurryconsistencyshouldbeconsideredstratigraphicchangesoroperationalrequirementsofmotorcontrol,themudistoothin,small,pooreffectofeliminationofslagwall;slurryistoothickwillweakenbitimpactfunction,reducedrillingspeed.
(5)drilling
Theboreholeisakeyworkingprocedure,inconstructionmuststrictlyaccordingtotheoperatingrequirements,inordertoensuredrillingquality,attentionmustbegiventotheholequality,mustbeoppositeforthisgoodmidlineandverticality,andpressedwellcasing.Mustpayattentionintheconstructionarecontinuouslyaddedandpumpingtheslurryslag(impacttype),butalsoatanytimetocheckwhetherthereisdeviationphenomenonintohole.Usingtheimpulseorclamshelltypedrillingmachineconstruction,soilduetovibrationandimpactneartheadjacentholestability.Sothedrilledholeshouldbetimelycleaninghole,decentralizationandpouringunderwaterconcretereinforcingcage.Drillordershouldalsobepracticaltoplan,shouldnotonlyguaranteeapileholeconstructiondoesnotaffectthelastpileholedrill,andthemovingdistanceofnottoofarandmutualinterference.
(6)theholecleaning
Thedrillingdepth,diameter,locationandshapeofholeisdirectlyrelatedtothequalityofpileandpilebodyblack.Therefore,inadditiontodrillingprocesscloseobservationsupervision,tomeetthedesignrequirementsindrillingholedepth,withdeep,hole,poreshape,poresizeandotherinspections.Intheendholeinspectioninfullcompliancewiththedesignrequirements,shallimmediatelyproceedtobottomholecleaning,avoidittoolongthatmudsettling,causedbyboreholecollapse.Forfrictionpilewhentheholewalliseasytocollapse,inunderwaterconcreteperfusionbeforethesedimentthicknessofnotmorethan30cm;whentheholewallisnoteasytocollapse,notmorethan20cm.Forthepost,inwaterorshootthebreeze,sedimentthicknesslessthan5cm.Holecleaningmethodistousedifferentandflexibleapplicationofdrillingrig.Usuallyyoucanusenormalcirculationrotarydrillingrig,reversecirculationrotarymachinevacuumsuctionmachineandslagpumpingcylinderholecleaning.Themudsuctionmachineholecleaning,requiredequipment,convenientoperation,holecleaningisthorough,butunstableinthesoilshouldbeusedcautiously.Itsprincipleistousecompressorgenerateshighpressureairintoasuctiondredgepipelinewillmudblowing.
(7)pouringunderwaterconcrete
Afterfinishinghole,canbeprefabricatedreinforcementcagehangingverticallyintothehole,positioningtobefixed,andthenusingaperfusioncatheterconcrete,pouringconcretedon'tinterrupt,orpronetothephenomenonofbrokenpile.
Effectofboredpilebearingperformancefactors
Intheconstructionprocess,constructionmachinery,duetogeologicaleffects,oftencausedbypilesoil(weaklayers),thethicknessof0.2~0.5m,thickandupto1m.Especiallyinsoftsoilwithmud,drilling,holebottomsedimentisinevitable;evenaftercarefulcleaninghole,theholecleaningafterandbeforeconcrete,willprecipitatesomesediment,andindrillingprocess,widespreadpresenceontheholewallandtheholebottomsoildisturbance.Alloftheseaffectthebearingcapacityofboredpileplay.
Pilestaticloadtestshowthat,boredpileendbearingcapacityofonlytheultimateloadofthe15%~35%,thesideresistanceandtipresistanceoftheexistingsynchronizationphenomenon.Givefullplaytotheroleoflateralfrictionresistanceisonlyafewmillimetersofthedisplacementofpiletop,togivefullplaytotheroleoftipresistanceofpilediameter,neededtoreach10%-30%ofthedisplacementofpiletop.Suchalargedisplacementinengineeringisnotallowed.Pilesidefrictionresistancetodamage,andthedamagelimitisreached,andtheendresistancecannotgetsufficientplay,itspotentialisgreat.Thisistheultimatebearingcapacityofboredpileisnottocause.
Researchshowsthat,atthebottomofpilesoilexists,notonlyaffectsthetipresistanceoftheplay,alsomakethesidefrictionresistanceloss.Theexistenceofweakinterlayerofpile,thepilebodyandthesoilfrictionbetweenthenatureofthechange,thefrictionbetweenpileandsoilbyloadtransfer,isverybad.Thisistheboredpilebearingnottallbenefitisanotherreason.
ImprovethebearingcapacityofBoredPiles
Ac
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