0503青岛LG土建施工方案en.docx
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0503青岛LG土建施工方案en.docx
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0503青岛LG土建施工方案en
1.0ConstructionPlanofEquipmentFoundation
1.1MeasurementWork
1.1.1PlaneControl
AccordingtothecoordinatecontrolpointsgivenbyPartyA,traversesurveyisusedtomeasurethesquareshapecontrolnetworkintheconstructionarea,and4semi-permanentcontrolpointsaresetatthefourcornersofthesquare.AfterreviewbyPartyA,thecontrolpointsshallbelaidwithbricksandmortarM7.5tobeasquarewell500×500×240,protectedbyscaffoldingsinredandwhite.Theadjacentcontrolpointistobeusedasthereferencepointinpositioning.J2theodoliteandsteelrulerandorthogonalcoordinatemethodareusedtomeasuretheaxesinverticalandhorizontaldirections.
1.1.2VerticalControl
OnthebasisoftheabsoluteelevationofthecontrolpointsgivenbyPartyA,DSZ2levelisusedtointroducethebenchmarksintotheconstructionareainordertocontrolthefoundationelevation.Priortotheconcretepour,carefulrecheckshouldbemadeontheaxes,topelevationoftheconcrete,andthetopelevationsoftheanchorbolts,andadjustedifoffsetisfound.Afteradjustment,makerecheckagaintoensurecorrectfoundationaxes,boltelevationandsoon.
1.1.3Afterthetemplatesareremoved,thesurveyorsshallmakeaxismarksintimeontopofthefoundationbymeansofalineinacarpenter’sinkmarker,andmakemarksofaxesandelevationsonthesidesoffoundationbyredpainting.
1.2Earthwork
Accordingtothefoundationlayout,thelargeareareadyforexcavationshallbedugbyexcavators,withmanualearthtake-away.Duringexcavation,apersonshallbeassignedtoshowdirectionsinordernottohavethepiletopsdamaged.Forthefoundationnotyetreadyformechanicalexcavation,manualdiggingwillbeconducted.Slopeisgoingtobehadbasedonthesoilcondition,witha300mmwidejobplaneatthebottomofthefoundation.Ifthefoundationpitisover20M²orconstructiondoneinrainydays,thenthereshouldbeaopendrainagetrencharoundthefoundationpit,andfourwaterpitsatthefourcornersofthefoundationpit,workersassignedtodrainthewaterawaytokeepthefoundationsoilfromsubmergence.Whenthefoundationpitiscompletedtothedesignrequirement,PartyAshouldbeinformedontimetocheckthefoundation,andthenextprocessshallnotbestartedtillitisqualified.On-timeearthrefillshallbemadeuponthecompletionofthefoundationwork.Andtheearthrefillshallnotcontainanybuildingdebris,likecrushedstonesorbricks,noranywaterinthefoundationpit.Layersofrefillingsoilshallberammedtoachievestrictwatercontentinthesoilrefilled.
1.3TemplateWork
1.3.1Theoutsidetemplatesofthefoundationpilecapshallbemadeupofbambooandgluedwoodenplates,andtheinsidetemplatesshallbeofshapedsteeltemplates,scaffoldingpipeswillbesupportedandfixed.Ifthecrosssectionisnotinlinewiththesteeltemplatenumber,thenwoodentemplateswillbeusedinsteadfortheshortageinordertosatisfythedesign.Uclampsaretobeusedinthesteeltemplatesplicingwithadistancelessthan300mmbetweeneachother.Lpinswillbeinsertedintheholesinthesteeltemplatesendstiffenerssoastostrengthentherigidityattheconnectionbetweenadjacenttemplates.Theconnectedportionshouldbesmoothandthetemplatesplicesbetight,andspongemaybestuckin,ifnecessary,toavoidmortarleakage.
1.3.2Thetemplatesystemshouldbedesignedinsuchawaythatdifferentfactorseffectiveontemplatesshouldbetakenintoaccount,likeconstantload,constructionload,concretepourspeed,collapserate,initialsolidificationtime,andsoon,soastomakecalculationofstrength,rigidityandstability.Insupportingthetemplates,allthememberpiecesshouldbeensuredofcorrectsizesandrelativepositions.Templatesupportsshallbeassimpleinstructureandeasyinuseaspossiblesoastobeconvenientforrebarbinding,concretepourandcuring.
1.3.3Boththetopandbottomendsofanchorboltsshouldbesecurelyfixedinthewaythatthetopendisclampedwithwoodorangles,andthebottomendissecuredwithadditionalrebarsandsurroundingtemplates.Theboltmoldsupportingshallbeindependentofthetemplatesupporting.Theboltsforroundequipmentfoundationshallbefixedwithspeciallymademolds.Thesupportingforboltmoldfixingshallbeindependentofthesupportingfortemplates.Theembeddedbolts’positionsmustconformtothedrawingsandspecifications.
1.4RebarWork
1.4.1Materials:
Therebarsfortheprojectmustbeprovidedwithqualitycertificate.Afterdeliveryonsite,visualcheckshallbemadetoseeiftheyareclean,nodamage,oilstainsorrustshouldbecleanedbeforeuse.Recheckshallbemadeasperthespecifiednumberinsampling.Itcanonlybeusedaftertherecheckispassed,thereportisgiventoPartyAforfiling.
1.4.2RebarPrefabrication
Rebarsshallbefabricatedtogetherattheprefabfieldandshallbetransportedtothesiteforlocalbinding.Allkindsofrebarequipmentsshallbereadyonsite,suchascuttingmachine,bendingmachine,straigtener,buttweldingmachine,DCweldingmachine,etc,andseetheequipmentlistforthespecificnumber.
1.4.3RebarConnections
Atthefoundationpilecap,therebarsunderstressshouldbeconnectedinastaggeredway,andthedesignandspecificationshallbesatisfiedintermsoftheconnectionnumber.
1.4.4RebarBinding
Intherebarbindingfortheshortcolumnsatopthefoundationpilecap,first,scaffoldingpipeswillbeusedfortemporaryfixingagainstslantingifthecolumnsarehighandthemainrebarsinsidearelong,andverticalityshouldbefoundbywayofwire-weight,andrebarbracingsshallbeaddedatsuitablepoints.Benchesshallbemadeforfoundationofbaseplatedoublereinforcementforeasyrebarbindingandtoavoidrebaroffsetduringconcretepour.Therebarprotectionlayerthicknesswillbecontrolledbymortar1:
2.
1.4.5RebarChargerSheetandMaterialPlateofRebars
Chargersheetwillbefilledinwhenrebardistributioncalculationisfinished.Foreachnumberofrebarslistedinthechargersheet,amaterialplatewillbemadeasthebasisforrebarfabricationand,asthelabelfordistinguishingdifferentprojectwork,structuremembers,rebarsofvariousgrades.Thechargersheetandmaterialplateshouldbestrictlycheckedforcorrectnesstoavoidanyre-workorwaste.
1.5ConcreteWork
Commodityconcreteistobeused.Afteritistruckedtothesite,itispumpedintotemplates.
1.5.1CheckofMaterialsDeliveredonSite
Cavingratecheckshouldbemadeontheconcreteusedonsite,andrelevantqualitycertificateisrequired.Non-conformedconcreteshallnotbeallowedforuse,inordertoensurethatconstructionmaterialswillcomeuptothestandardsconcerned.
1.5.2PreparationsbeforePouring
Checkthetemplatesfortheelevations,positionsandcrosssections.
Checkthesupportsforthestability,andcheckthetemplatesforthetightnesstoensurenon-offsetornon-leakageofmortar.
Checktherebarsandanchorboltsforsizes,quantityandpositions.
Cleanandwashtemplatesoffdebrislikerubbish,bitsofwoodordirt.
1.5.3ConcretePouring
Inthedirectionoffoundationheight,concretewillbepouredlayerbylayerinathicknessof300mm.Thehigherlayerofconcreteshouldbepouredinthetimewhenthelowerlayerisstillnotyetininitialsolidification.Duringconcretepour,specialpersonshouldbetheretowatchoutforthetemplates,supports,rebars.Ifsomedeformationoroffsetisfound,concretepourshouldbestoppedimmediately,andtrytogeteverythingrightbeforeconcretesolidification.
1.5.4ConcreteVibration
Insertiontypevibratorswillbeused.Duringvibration,itisrequiredthatthevibratorsshouldbe“quicklyinsertedandslowlywithdrawn”,andthedistancebetweenvibratingpointsshallbeabout1.5timesofthevibratorrodworkradius(about450mm-600mm),andwhenvibratingthehigherlayerofconcrete,vibratorrodsshouldbeinsertedintothelowerlayerforabout5cm,soastoeliminatethejointbetweentwolayers,meanwhilethevibrationofupperlayershouldbedonebeforetheinitialsolidificationofthelowerlayer.Eachvibrationpointshouldbevibratedinduetime,normally20-30seconds,dependingonthesituationthattheconcretesurfaceliesflatwithoutanymoresinking-downorbubblesormortarrisingup.Uponcompletionofconcretepour,getridofthewateroozingoutfromthesurface.Secondaryvibrationmaybedonewhennecessarybeforetheinitialsolidification,andpressthesurfacedowntoeliminateanycontractioncracks.
1.5.5ConstructionJointProcessing
Inprinciple,thefoundationsarepouredtoshapeonceatime,withoutconstructionjointusually.Ifconstructionjointmustbereservedduetosomeforcemajeure,thentheDesignermustbeaskedforitsadviceandtheOwner’ssiteengineerforhiscommand,andthespecificationsaswell.Forthefoundationswithconstructionjoints,chiselawayanddampenthehardenedcementfilmandloosepebblesontheconcretesurfacepriortosetupofuppertemplates,and50mmthickmortarmixedwithconcreteshallbelaidbeforeconcretepour,rammedcarefullytogettightcombinationofnewandoldconcrete.
1.5.6ConcreteCuring
Within12hourswhenconcretepourisfinished,foundationsshouldbecoveredintimeandwateredforcuring.Ifsomefoundationistoosmalltobecovered,thenspecialpersonshouldbeassignedtowateritforcuring,inordertokeepthefoundationsurfacewet.Forthefoundationsconstructedinwintertime,itscuringwillneedplasticsheetandstrawbagsforcoverage,inadditiontoanti-freezerintheconcrete.
1.5.7Concrete
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