MSS滑移模架施工工艺及技术控制Word格式.docx

MSS滑移模架施工工艺及技术控制Word格式.docx

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LiuJizheng,QiLujie,WangXiaoshan

（ShandongProvinceTrafficEngineeringCorporation,NanjingYangtzeRiverBridgeProjectDepartment）

[Abstract]thispaperbrieflyintroducesthestructureandcompositionofMSSslipanditsapplicationinconstruction.

Slidingformwork;

constructiontechnology;

deflectioncontrol

I.GeneralSituationoftheproject

NanjingYangtzeRiverBridgeNorthBridgebridgeupperstructurefor16m*30mand5m*50mPCwithvariablecrosssectioncontinuousbeambridge.Thewholebridgesectioniscomposedoftwosingleboxandsinglechamberbeamsectionsseparatedfromtoptobottom,andacentralpartitioncoverplateisarrangedinthemiddle.among

5*50mapproachbridgein

30mapproachbridgeandthemainbridgetransitionsection,thebridgeislocatedinlandandwater,landahole,fourholesonthewater,thepeakwaterlevel7m.Therefore,itisveryimportanttochooseanoptimumconstructionscheme.

Two,schemecomparison

Basedonthebridgepositionof50mbridge,twoschemesshouldbeadoptedfortheconstructionofsuperstructure:

1.Supportconstruction,setupafullsupportwithoneholeontheriverbank,insertfourholecopperpipepileinwater,andbuildasteelpipepilesupport.Adopttheconstructionwithoutscaffold.Thatis,theintroductionofforeignadvancedequipment-slidingdieframeforconstruction.

Thefirstconstructionplanisthetraditionalconstructionmethodofourcompany.Thereareabundantconstructionexperience,thetechnologyiseasytocontrol,butthisschemeforwaterconstruction,heavyworkload,Jixietaiban,theeconomyisnotreasonable,theconstructionscheduleisnotideal.Secondkindsofconstructionschemes,advancedconstructionequipment,withtheleadingdomesticlevel,butthiskindofequipmentisusedforthefirsttimeourcompany,thetechnologyisdifficulttocontrol,fortheconstructionofwaterinthemiddlespancast-in-placecontinuousbeambridgeisparticularlysuitablefor.Syntheticmanifoldreasons

InconsiderationofNanjingbridgeprojectofthecompanyultimatelydecidedtousenoscaffoldingconstructionthattheintroductionofMSSslidingformworksystem.

Three,slidingmodeprofiles

TheMSSslidebeamintroducedbyourcompanyismainlycomposedofsixparts,thebracket（NiuTui）,themainbeam（GangXiangliang）,thecrossbeam,thebackbeam,theexternaldieandtheinternaldie.Eachpartisequippedwithaninternalhydraulicormechanicalsystem.Thestructureandfunctionofeachcomponentareasfollows:

1.bracket

Bracketsarecommonlycalledbracketsandtriangularstructures.Throughthereservedhole（diameter:

80cm*100cm）insertattachedtothepieronthepier.Itsroleistosupportthemaingirder,themaingirderloadtransfertothepieronthebracket.Aslidingblockisarrangedonthetopfaceofeachbracket.Itisequippedwithtwopairsof20thorizontalautomaticmovinghydraulicjacks.

A450tverticalautomatichydraulicjack,alongitudinalmovinghydraulicjack.Themainbeamisembeddedintheoverheadtravellingcrane.Inordertoreducethefrictionbetweenthemainbeamandthecrownwhenmovinginlongitudinaldirection,thecraneisequippedwithapolyfourvinylslideboard,andthemainbeamispositionedinthedirectionoftheslab,thedirectionofthebridgeandtheverticalheightthroughthethreehydraulicsystem.

2.mainbeam

Theslidinggirderisapairofsteelboxgirders.Thesectionsizeofthesteelboxgirderiswide:

2.0m,height:

3.0m,length64.8m,dividedintosixsections-10.7m+4*0.8m+10.9m）.Thejointsareconnectedbyfrictiontypehighstrengthbolts.Inordertomakethemainbeamslidealongthebridgefromtheupperholetothenexthole,thefrontandbackofthemainbeamisequippedwithabridgetypenosebridge,long21m.Themaingirderisaloadbearingcomponentoftheslidingmode,weighingabout350t.Themainbeamisprovidedwithawindow,andthecrossbeamisprovidedwithamainbeam;

averticalhydraulicjack,amechanicaljackandahorizontaljackarearrangedinthewindow.Thesteelbeamishingedwiththemainbeamthroughthepressuresystem,andthemainbeamissubjectedtotheconstructionloadoftheexternal,internalandupperstructuretransferredbythecrossbeam.

3.beam

Thewholeslidingmodehas18pairsofcrossbeams,thebeamis"

H"

type,thesteelstructuresizeis35cm*90cm*900cm,eachpairofbeamsforpinconnection,thebeamspacing3.6m,thebeamhasnopinhole,inordertoinstalltheexternalmoldsupport.Thecrossbeamcanbeadjustedverticallyandtransverselythroughthepressuresysteminthemainbeam.

4.externaldie

Theoutermoldcomprisesabottomplate,webplate,ribandflangecomponent.Thefloorplateisdirectlylaidbetweenthetwoadjacenttransversebeamsandcorrespondswiththecrossbeam.Theconnectingdirectionofeachpairofbottomplatesalongthedirectionofthecrossbeamisconnectedbycommonbolts.Theoutertemplatejointisintheoutermouldcentralaxis.Totalfloorwidth6.5m.Theweb,ribandflangealsocorrespondswiththebeam,andthroughthetemplatebracketandthesupportingbeamsareprovidedtoinstall.

5.internalmodel

Setalongtheinternalmoldmoldshiftingsystemincludingthetemplate,electriccar,railandbeammodel.Thetransversetransportationandinstallationofelectriccartocompletethe.Theelectriccarisequippedwithahydraulicsystem,throughwhichthehydraulicsystemtocompletetheinstallationofinternaldie.

Four、constructionprincipleandprocessflowofSlipform

TheinstallationandadjustmentofslipandslipmoldMSStemplateis"

hydraulic"

asthedrivingforcetothehydraulicjacktoworkincontrolequipment,hydrauliccontroldevice,thehydraulicjackpush,thuscompletingtheadjustmentinplace,thecrossbeamandtheinnerandoutermouldinstallationandadjustment.Beforeconstruction,firstofall,thepreparationoftheconstructionalongthetechnicalprogram.Thepurchaseofspecialequipment,machineryandequipment,leasinglargeliftingequipment.Slidingmodeconstructionaccordingtothefollowingprocedures:

（NiuTui）bracketassembly,girderassemblingandrelatedconstructiondesigntoolsinplace,liftingbracketgirderhoistingandinstallation,beammainbeaminplace,layingfloor,installationofformworksupport,installationandconstructionoftheouterwebandflangeplate,plate,die.

Five,slipformsitespecificassembly

Thequalityoffieldassemblyofslipformdirectlyaffectsthequality,scheduleandconstructionsafetyofboxgirderconstruction.Therefore,whenassembling,

Accordingtothedesigndrawingsalongthedie,instrictaccordancewiththe"

steelconstructiontechnicalspecifications"

foroperation,forhigh-strengthboltjointsurface,carefulinspection,onebyonesurfacetreatment,soastoachievethepropercoefficientoffriction.Highstrengthboltconnection,taketheinitialandfinalmaterialexpress,repeatedoperation,makeeveryboltmeetthedesignoftorquewrenchtorquevalue,andperiodiccalibration,ensuretheconnectingforcestrength,preventingengineeringaccidents,affectingthequalityofconstructionsafetyandconstruction（with）partsmustberemovedortreatedqualifiedrearcanuse.

Bracketassemblyonsite:

becausethebracketistriangularandhasacertainheight,thesiteassemblyisunstableandshouldbesupportedbyatriangularsupport.Theliftingbracketplacement,pierreservedhole,withthetopbracketbylevelingleveling,sothatthecraneonthesurfacesmoothslip.Inordertopreventthecarriagecapsizedintheforce,eachofthebracketiscomposedofthreadtopull,embeddedpier,sotheinstallationbracketshouldbeontheothersideofunilateraltemporaryplacementofacarryingpole,wearthreadtension,topreventinstability.

Themainbeamisinstalled;

becausethemaingirderisselfimportant,thewholehoistingisdifficult.Duringconstruction,thecraneishoistedattwotimes,andtemporarysupportisarrangedinthespantocarryouttheclosureassembly.Thisrequiresthetemporarysupportoftheelevationofaccuratemeasurementandslope,sothatthesteelbeaminthemiddleofthesmoothdocking,assembly.

Afterthemaingirderisassembled,thecrossbeamisplacedatthemainbeamwindow,andthemainbeamisplacedundertheinfluenceofthehydraulicsystem,andthebridgeispositionedaccuratelyinthedirectionofthehydraulicsystemwhenallthebeamsareinstalled.Atotalstationortheodoliteisinstalledatthecenterofthepier,thebridgeaxisisreleased,thecrossbeamisadjustedaccordingtotheaxisofthebridge,andthebottomplateislaidwithapin,andtheaxisdeviationiscontrolledwithin5mm.Then,theinstallationofthewebandflangeplates.

Whenassemblingtheslipform,thepartsarerequiredtobeconnectedreliably.Afterassembly,theutilitymodelcanbesafelyandreliablychecked,andcanbeusedfortheconstructionoftheupperstructure.

Six、adjustmentoftemplateandelevationcontrol

Inordertobettersetcamber,thissetofslidingformworkisdesignedwithLCMformwork,andthedesignissupportedbysheetiron.Accordingtotheactualconstructionpractice,takingintoaccountthequalityofthecastbeambody,weadoptedtheputtytoa