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1、英文原文及翻译LinearControlInCantileverCastingofPrestressedConcreteBridgeAbstractSymmetriccantileverconstructionmethoddoesnotaffectthebridgeduringtheconstructionofshippingortravel,andmakefulluseofthenegativemomentcapacityofprestressedconcretetowithstandthestrongfeatures,improvedabilitytocrossthebridge,cant
2、ileverconstructionmethodfocusesonlinearcontrol.Inthispaper,double-trackhighwaybridgeNanjiangprestressedconcretecontinuousgirderbridgeasanexample,thecantileversuspendedscaffoldingconstruction,closuretocontroltheconstructionprocesssuchaslinearmethodsandmeasures.KeywordsCantileverconstruction;deflectio
3、n;Closure;linearcontrolI. ProjectOverviewDouble-trackroadbridgeinsouthernBohaiBankHaiheRiverestuary,theexistingSouthBridgeandtheSouthernXinjiangRailwayBridgenorth,westandJingulineacrossBeachBoulevardoverpassconnectingeastandsouthernports,themainroadSouthroadconnectingthebridgeandtheexistingSouthBrid
4、geisthevehicleoutoftheimportantsouthernportaccessroad.Double-trackmainhighwaybridgeinSouthBridge2(48.6m+364m+48.6m)taperedprestressedconcretecontinuousboxgirder.Thetotalbridgewidth26.5m,andeachpieceboxfortheindependentwebsingleboxsinglestraightsection,themainfulcrumofthebeamacrossthehigh4m,crosstheb
5、eamofhigh2m,bytheendofthesecondparabolabeam,boxbeamfromtheroof2%formationofone-waycross-slope,highbeamsareabridgeheightofthelateralwebedge.II. LinearControlofCantileverCantileverconstruction(alsocalledbalancedcantileverconstruction)iscompletedpiers,alongthedirectionoftwoadjacentspansymmetricallypiec
6、ewiseconstructionofabalancedapproach.Asthecantileverbeamconstructionwithinthenegativemoment,tobeontheconcretebridgebeamsprestressedparagraphbyparagraph,theupperedgesothatithascompletedthebeamsectionwithlinksintothewholestructuralsystemandtheconversionbycross-fold,eventuallyformabridgestructure.Asthe
7、bridgeconstructionandoperationofthestressstatewhenthestressstatesimilartowarranttheneedforconstructionmaterialsincreasedovertheamount.Astheconstructionofstate(workingload,prestressloss,concreteshrinkageandcreep,temperature,humidity,time,etc.),parameterselection(materialproperties,sectionproperties,e
8、tc.)andstructureofthecalculationmodel,andsiteconditionsaredifferent;sametime,thestructureofdifficulttoaccuratelydeterminethenonlineardeformation;constructionofthevariabilityofthematerialsusedandotherfactors,makestheconstructionprocess,theactualstatedeviatesfromthedesignstructureofthedesiredidealstat
9、e.Therefore,thebridgestructureduringconstructionmustbetheactualresponse(elevation,line,mainbeamstress,etc.)forthestrictconstructioncontrol.A. 0#blockconstructionHangingistheuseoftheboxsectionhasbeenpouredasastrongpoint,andsoonthroughtrussgirdersystem,theendofcantilevercastingmoldsystem,sopeopleNo.0i
10、stocreateaworkingplatform.BoxatthepierbeamNo.0bindingsitesarecomplex,embeddedparts,steel,allsteelbeamsandchannelstothePC,anchorage-intensivestaggered,verticalandhorizontalbeamsurfacehasslopefaceandcrosssectiontobecloselylinkedusingacastingprocess,concretesquareabout237.8squaremeters.FullSupportcapus
11、eoferection,stentplacementNo.0.0#initialsegmentoftheconstructionblockistheelevationofthestructureformedbytheelevationofitspre-modification,deformationandfoundationsupportsettlementthrownhigh,andbearinghigh-pressuredeformationcastcomposition.Amongthem,thestentdeformationandfoundationsettlementParabol
12、icthegreatestimpactontheelevation.Therefore,theinitialsegmentofstentstiffnessstrongerfoundationshouldbestrong,toreducethestructuralalignmentoftheinitialerror.B. DeflectionControlinConstruction0#blockconcretepouringandtensiononthebearingsweretemporarymeasureswithfixedaftertheassemblyintheblockNo.0Bas
13、ket,symmetricalpiecewiseCantileverBlock1to7.Finally,incross-sectionoftheconstructioncarriedoutinclose.Spancontinuousmulti-spancantileverbridgeconstructionisoneofthemostimportanttasksdeflectioncalculationandcontrol.BoxGirderBridgelinearcontroltokeepthewholekeytothedesignrequirements.Continuousbeambri
14、dgeconstructioncantileverdeflectioniscomprisedof:themainpiersectionCantileverdeflectionwhentheTstructuresystem;systemconvertedeachsegmentintoacontinuoussystemofbridgedeflectionandafterthedeadload,liveloadandthesystemofpost-shrinkageandcreepcausedbydeflection;Cradlesystemdeflectionunderload.Sincethec
15、alculationinvolvesthecalculationofdeflectionschema,thetemporaryloadsimulation,thesimulationofconcretepouringprocess,prestressedpositionandtensionofthesimulation,post-deadload,liveload,impactandlongcreepeffects,thedeflectionaccuratecalculationofextremelycomplexreality.Thus,Cantileverconstructionbefor
16、etheconcretemixaccordingtothesample,measuretheelasticmodulusofconcrete,concreteshrinkagecoefficientofbulkdensityandotherparameters,torepeatedlycheckcalculationsandcomparedwiththedesigndatatofindproblems.Intheconstructionofthecontrolprocessshouldalsobeamendedaccordingtothemeasuredelevationdatastructureofparameters.C. Factorsaffectingthecontrolofdeflection1) blocksetpieceweightvariationdegreeofthequalityofblockpiecesprimarilybycross-sectiondimensions
