英文原文及翻译LinearControlInCantileverCastingofPrestressedConcreteBridgeAbstractSymmetriccantileverconstructionmethoddoesnotaffectthebridgeduringtheconstructionofshippingortravel,andmakefulluseofthenegativemomentcapacityofprestressedconcretetowithstandthestrongfeatures,improvedabilitytocrossthebridge,cantileverconstructionmethodfocusesonlinearcontrol.Inthispaper,double-trackhighwaybridgeNanjiangprestressedconcretecontinuousgirderbridgeasanexample,thecantileversuspendedscaffoldingconstruction,closuretocontroltheconstructionprocesssuchaslinearmethodsandmeasures.KeywordsCantileverconstruction;deflection;Closure;linearcontrolI. ProjectOverviewDouble-trackroadbridgeinsouthernBohaiBankHaiheRiverestuary,theexistingSouthBridgeandtheSouthernXinjiangRailwayBridgenorth,westandJingulineacrossBeachBoulevardoverpassconnectingeastandsouthernports,themainroadSouthroadconnectingthebridgeandtheexistingSouthBridgeisthevehicleoutoftheimportantsouthernportaccessroad.Double-trackmainhighwaybridgeinSouthBridge2(48.6m+364m+48.6m)taperedprestressedconcretecontinuousboxgirder.Thetotalbridgewidth26.5m,andeachpieceboxfortheindependentwebsingleboxsinglestraightsection,themainfulcrumofthebeamacrossthehigh4m,crossthebeamofhigh2m,bytheendofthesecondparabolabeam,boxbeamfromtheroof2%formationofone-waycross-slope,highbeamsareabridgeheightofthelateralwebedge.II. LinearControlofCantileverCantileverconstruction(alsocalledbalancedcantileverconstruction)iscompletedpiers,alongthedirectionoftwoadjacentspansymmetricallypiecewiseconstructionofabalancedapproach.Asthecantileverbeamconstructionwithinthenegativemoment,tobeontheconcretebridgebeamsprestressedparagraphbyparagraph,theupperedgesothatithascompletedthebeamsectionwithlinksintothewholestructuralsystemandtheconversionbycross-fold,eventuallyformabridgestructure.Asthebridgeconstructionandoperationofthestressstatewhenthestressstatesimilartowarranttheneedforconstructionmaterialsincreasedovertheamount.Astheconstructionofstate(workingload,prestressloss,concreteshrinkageandcreep,temperature,humidity,time,etc.),parameterselection(materialproperties,sectionproperties,etc.)andstructureofthecalculationmodel,andsiteconditionsaredifferent;sametime,thestructureofdifficulttoaccuratelydeterminethenonlineardeformation;constructionofthevariabilityofthematerialsusedandotherfactors,makestheconstructionprocess,theactualstatedeviatesfromthedesignstructureofthedesiredidealstate.Therefore,thebridgestructureduringconstructionmustbetheactualresponse(elevation,line,mainbeamstress,etc.)forthestrictconstructioncontrol.A. 0#blockconstructionHangingistheuseoftheboxsectionhasbeenpouredasastrongpoint,andsoonthroughtrussgirdersystem,theendofcantilevercastingmoldsystem,sopeopleNo.0istocreateaworkingplatform.BoxatthepierbeamNo.0bindingsitesarecomplex,embeddedparts,steel,allsteelbeamsandchannelstothePC,anchorage-intensivestaggered,verticalandhorizontalbeamsurfacehasslopefaceandcrosssectiontobecloselylinkedusingacastingprocess,concretesquareabout237.8squaremeters.FullSupportcapuseoferection,stentplacementNo.0.0#initialsegmentoftheconstructionblockistheelevationofthestructureformedbytheelevationofitspre-modification,deformationandfoundationsupportsettlementthrownhigh,andbearinghigh-pressuredeformationcastcomposition.Amongthem,thestentdeformationandfoundationsettlementParabolicthegreatestimpactontheelevation.Therefore,theinitialsegmentofstentstiffnessstrongerfoundationshouldbestrong,toreducethestructuralalignmentoftheinitialerror.B. DeflectionControlinConstruction0#blockconcretepouringandtensiononthebearingsweretemporarymeasureswithfixedaftertheassemblyintheblockNo.0Basket,symmetricalpiecewiseCantileverBlock1to7.Finally,incross-sectionoftheconstructioncarriedoutinclose.Spancontinuousmulti-spancantileverbridgeconstructionisoneofthemostimportanttasksdeflectioncalculationandcontrol.BoxGirderBridgelinearcontroltokeepthewholekeytothedesignrequirements.Continuousbeambridgeconstructioncantileverdeflectioniscomprisedof:themainpiersectionCantileverdeflectionwhentheTstructuresystem;systemconvertedeachsegmentintoacontinuoussystemofbridgedeflectionandafterthedeadload,liveloadandthesystemofpost-shrinkageandcreepcausedbydeflection;Cradlesystemdeflectionunderload.Sincethecalculationinvolvesthecalculationofdeflectionschema,thetemporaryloadsimulation,thesimulationofconcretepouringprocess,prestressedpositionandtensionofthesimulation,post-deadload,liveload,impactandlongcreepeffects,thedeflectionaccuratecalculationofextremelycomplexreality.Thus,Cantileverconstructionbeforetheconcretemixaccordingtothesample,measuretheelasticmodulusofconcrete,concreteshrinkagecoefficientofbulkdensityandotherparameters,torepeatedlycheckcalculationsandcomparedwiththedesigndatatofindproblems.Intheconstructionofthecontrolprocessshouldalsobeamendedaccordingtothemeasuredelevationdatastructureofparameters.C. Factorsaffectingthecontrolofdeflection1) blocksetpieceweightvariationdegreeofthequalityofblockpiecesprimarilybycross-sectiondimensions