供水工程中PCCP管施工的不同基槽处理方式

PCCP1,1,2,1(1.,519020;2.,116034):(PCCP),,,,;,,,PCCP200612,,:;;:TU991.5:C:1000-4602(2008)22-0098-04DifferentFoundationTrenchTreatmentofPrestressedConcreteCylinderPipeinWaterSupplyProjectZHAOKai1,LIYong2hai1,ZHANGXin2xin2,GUORong2xin1(1.ZhuhaiWaterSupplyCompany,Zhuhai519020,China;2.SchoolofChemicalandMaterial,DalianPolytechnicUniversity,Dalian116034,China)Abstract:Duringtheconstructionofprestressedconcretecylinderpipe(PCCP)forwatersupplyfromthePinggangPumpingStationinsalttideperiod,thedifferenttrenchexcavationandfoundationsup2portwereadoptedaccordingtodifferentgeologicalconditions.BengzhanRoadsectionislocatedinthear2tificialsoillayer,andaslopeexcavationiscarriedoutaftersoiltampingorriprap.HaidiRoadsectionislocatedinthecoastalsoftsoillayer,andafterthereinforcementofsoftsoilwithcementmixedpiles,theconstructionofsteelsheetpileisperformed,andthePCCPsarelaid.FrombeingputintooperationinDecember2006tonow,thepipelineburstincidentdoesnothappen,whichguaranteesthewatersupplysecurityofZhuhai2Macaoinsalttideperiod.Keywords:prestressedconcretecylinderpipe;watersupplyproject;foundationtrenchtreat2ment,23.8km,2.4m,100104m3/d,12km(PCCP),,1,,,30%,892422200811CHINAWATER&WASTEWATERVol.24No.22Nov.2008,,,,,,,1.0m,,,,,,,,,1530m,,,1Tab.1Majorphysicalandengineeringpropertiesofsoilintwosections/%/(gcm-3)/%/%/kPa/MPa/MPa()/kPa()/kPa36.992.710.9693.8319.190.38,91049.812.661.3497.318.981.2965263.512800m,PCCP1943m,,50,7;,,2.83.5m()1994,,,,11,,,,30cm,1114m,,,,,,,,,,20cm,()112,,50kN,4%,200g/m2,20%30cm0.550,=37,50cm,30cm0.3,,,,,,PCCP2,6645m,PCCP3977m,,,,;,,,(CFG),,CFG,,(),;,,,,,99www.watergasheat.com,:PCCP2422,,,,,,,,,,,,,,,211,;,22Tab.2Technicalrequirementsofcementmixedpile/m/mm/m/kN/kPa/kPa1.85008.0080901400121Fig.1Layoutofcementmixedpile2Fig.2Flowchartofcementmixedpileconstructionprocess,,12%15%,0.450.55500mm,212,,300mm,,0.3m30cm20cm,0.550,=37,,213,9mC20,20cm,5m,30mm,,200mm21311,,,,3cm,0012422www.watergasheat.com,4m,,;,,35cm,,,4m,(3)3Fig.3Sketchofverticalstructureofsteelsheetpile21312:;70%;;,;PCCP,;;,();,,3PCCP,,,,;,,PCCP200612,1.71108m3,,,,:[1]GB/T196852005,[S].[2]JGJ792002,[S].:[phone]E-mail:[e-mail]:2008-05-29,,,,,,24h,,20086,5000h,R&D2005100,2008,,()101www.watergasheat.com,:PCCP2422