南海桩基施工方案Eng

'工程概况ProjectGeneral1.1工程描述ProjectDescription本工程为南海乙烯装置桩基础工程，包括预制桩和打桩两部分。桩的截面尺寸有300X300mm2和400X400mm2两种，长度有7m、10m、13m三种，打桩区域分A、B、C、D、E五个区。桩预制前，先做桩的静荷载试验，以确定桩打入土层的深度，A、B、C区做4根试验桩，D、E区做2根试验桩。ThisprojectisaboutthepilingfoundationoftheCSPCLOPPilingWorksProject,includingthepilepre-castingworkandthepilingwork.Therearetwotypesofsectiondimensionsofthepile:300X300mm2and400X400mm2.Thepileshavedifferentlengths,whichcover7m,10mand3m,andthepilingareasaredividedintofive:A，B,C,D,andE.Static-loadtestwillbedonetothepilepriortothepre-castingworktoensurethedepthofthepileintotheearth.FourpileswillbetestedinareasA,BandC,andtwoinareasDandE.1.2设计、施工要求DesignandConstructionRequirements1)本工程中预制桩不接桩，为单节桩。Thepre-castpileinthisprojectwillbesingle-sectionpilethatwillnotbeconnected・2)预制桩无桩尖，打桩前要进行预钻孔，钻孔深度为桩打入深度以上一米处。Sincethepre-castpilehasnotips,holedrillingwillbedonepriortopilingwork,andthedepthofthedrillingholeisImabovethepilingdepthintotheearth. 1)打桩机的桩锤冲程应可调节，以避免打桩开始和结束时，土层压力对桩体的破坏作用。 Thedrivinghammerstrokeofhepiledrivershallbeadjustabletoavoidthedestructionofthesoilstratepressureonthepileinthebeginningandattheendofthepilingwork.1.1工程量：6858根钢筋混凝土预制桩。Workamount:6858piecesofreinforcedconcretepre-castpiles.2施工程序ConstructionProcess2.1施工总程序GeneralProcess 2.2 PileFoundationLoadTest2.4桩预制PilePre-casting2.5打桩PilingWork2施工部署ConstructionDeployment根据工期总体要求，桩预制开始30天后开始打桩。开始时A、B、C区 布置一套打桩机械，D、E区布置两套打桩机械。A、B、C管道区域施工完后打桩机移至D、E区施工，D、E区施工完后3套打桩机移至A、B、C区施工。每台打桩机每天打桩约20根，为了满足打桩要求，桩的预制每天要完成80根以上。Accordingtothegeneralconstructionperiodrequirement,thepilingworkwillbegin30daysafterthepilepre-castingwork.OnesetofpilingmechanismwillbesetinareasA,B,andCandtwosetsinareasDandEinthebeginning.ThepiledriverwillbemovedtoareasDandEaftertheconstructioninA,BandCpipingareasfinishes,andthethreesetsofpiledriveswillbemovedtoareasA,BandCwhentheconstructioninareasDandEhasbeendone・Theworkamountofthepiledriverisabout20pieceseacheveryday.Tomeettheneedofpilingwork,thepre-castingamounteachdayshouldbeover80pieces.2施工准备ConstructionPreparation2.1预制场地布置Pre-castingFieldLayout根据JGC招标文件的要求并考虑尽量降低造价，桩的预制工作在其提供的场外预制场地进行。AccordingtoJGCITBrequirementsandwiththeconsiderationofreducingcostaspossible,thepilepre-castingworkwillbedoneontheprovidedoffsitefabricationfield.2.2定型钢模板制作SteelFormFabrication预制桩模板采用定型钢模板，模板结构如下图所示。为了保证打桩进度的要求和预制场地的限制，制作模板48套。Steelformwillbeadoptedforpilepre-casting,whosestructureisshownas 布置一套打桩机械，D、E区布置两套打桩机械。A、B、C管道区域施工完后打桩机移至D、E区施工，D、E区施工完后3套打桩机移至A、B、C区施工。每台打桩机每天打桩约20根，为了满足打桩要求，桩的预制每天要完成80根以上。Accordingtothegeneralconstructionperiodrequirement,thepilingworkwillbegin30daysafterthepilepre-castingwork.OnesetofpilingmechanismwillbesetinareasA,B,andCandtwosetsinareasDandEinthebeginning.ThepiledriverwillbemovedtoareasDandEaftertheconstructioninA,BandCpipingareasfinishes,andthethreesetsofpiledriveswillbemovedtoareasA,BandCwhentheconstructioninareasDandEhasbeendone・Theworkamountofthepiledriverisabout20pieceseacheveryday.Tomeettheneedofpilingwork,thepre-castingamounteachdayshouldbeover80pieces.2施工准备ConstructionPreparation2.1预制场地布置Pre-castingFieldLayout根据JGC招标文件的要求并考虑尽量降低造价，桩的预制工作在其提供的场外预制场地进行。AccordingtoJGCITBrequirementsandwiththeconsiderationofreducingcostaspossible,thepilepre-castingworkwillbedoneontheprovidedoffsitefabricationfield.2.2定型钢模板制作SteelFormFabrication预制桩模板采用定型钢模板，模板结构如下图所示。为了保证打桩进度的要求和预制场地的限制，制作模板48套。Steelformwillbeadoptedforpilepre-casting,whosestructureisshownas follows.Fortherestrictionofthepre-castingfield,48setsofformswillbemadetoensurethepilingprogress.••OO••、/JLH6IA—AoA等厂、[*135QQK1S=3mm钢板A70X50@1000A70X50四根通长2.1放桩位线PilePositionStake-off4..3.1放轴线桩，以JGC提供的基准点引岀，在打桩区附近设置，使用50X70X500的木方并做混凝土墩保护，数量可根据现场情况而定。FromthebenchmarkprovidedbyJGC,axispilewillbesetnearthepilingarea.Woodenblockof50X70X500willbeused,andconcretepierwillbemadeforprotection,thequantityofwhichwillbedeterminedaccordingtothefieldcircumstances.4.3.2放桩位桩PositioningPileSetting1）使用（1）6—（I）8长150mm圆钢筋头作为桩位桩；Theroundrebarheadof（1）6—