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1、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-cas
2、tingworkandthepilingwork.Therearetwotypesofsectiondimensionsofthepile:300X300mm2and400X400mm2.Thepileshavedifferentlengths,whichcover7m,10mand3m,andthepilingareasaredividedintofive:A，B,C,D,andE.Static-loadtestwillbedonetothepilepriortothepre-castingworktoensurethedepthofthepile
3、intotheearth.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,holedrill
4、ingwillbedonepriortopilingwork,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。Thedrivinghammerstrokeofhepiledrivershallbeadjustabletoavoidthedestructionofthesoilstratepressureonthepileinthebeginningandattheendofthepilingw
5、ork.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GeneralProcess2.2PileFoundationLoadTest2.4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
6、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.Thepiledri
7、verwillbemovedtoareasDandEaftertheconstructioninA,BandCpipingareasfinishes,andthethreesetsofpiledriveswillbemovedtoareasA,BandCwhentheconstructioninareasDandEhasbeendone・Theworkamountofthepiledriverisabout20pieceseacheveryday.Tomeettheneedofpilingwork,thepre-castingamounteachda
8、yshouldbeover80pieces.2施工准备ConstructionPreparation2.1预
