英文版 深基坑土方开挖施工方案 WP for Earthwork Excavation of Main Power Building

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BIssueforApprovalAIssueforApprovalREV.DESCRIPTIONDATEDESIGNEDBYCHECKEDBYREVIEWEDBYAPPROVEDBYOWNERVIETNAMELECTRICITYTHERMALPOWERPROJECTMANAGEMENTBOARD3CONSULTANTPOWERENGINEERINGCONSULTINGJOINTSTOCKCOMPANY3CONTRACTORTHECONSORTIUMOFCHENGDA-DEC-SWEPDI-ZEPCSUBCONTRACTORZHEJIANGTHERMALPOWERCONSTRUCTIONCOMPANYPROJECT:DUYENHAI3THERMALPOWERPLANTPROJECTCONTRACTNO:DH3-05082011DOCUMENTNAME:WorkingPlanforMainHouseExcavationPROJECTCONTROLNO.:DH3-31U-C-WP-0002REV:B Contents1ProjectOverview12ReferenceStandardsandCodes13ConstructionPreparation13.1TechniquePreparation13.2LaborPowerPreparation13.3MachineryPreparation23.4MaterialPreparation23.5WorkingSurroundingsPreparation23.6WorkingSchedule24MainMethod&TechniqueMeasures34.1ConstructionSequence&Methods34.2Slope34.3Steelpile44.4DrainageofFoundationPit64.5FoundationPitMonitoring65QualityAssuranceMeasures65.1OrganizationchartofQA/QC65.2Flowchartofqualityproblemstreatment75.3Specificmeasures86SupplementofGuaranteeMeasurestotheSchedule86.1EstablishaStrictCensorshipforConstructionSchedule86.2WarrantytheSupplyofMaterials&OutwardProcessingComponents86.3TheCoordinationWorkBetweenCivilEngineering&EquipmentsInstallation97Safety&CivilizedConstruction98AttachmentDrawing118.1Drawingofexcavationfor#1mainhouse118.2LayoutofDrainagemeasuresfor#1mainhousefoundationpit128.3SteelSheetpilessurveypointslayoutfor#1mainhouse138.4SurveyRecordforFoundationPit148.5Calculationforsteelpilewall15 WorkingPlanforMainHouseExcavation1ProjectOverviewProjectName：DuyenHai32x622MWThermalPowerPlant;TheOwner:PowerGenerationCorporation1TheConsultant:PowerEngineeringConsultingJointStockCompany3DesignOverview:TheprojectofVienamDuyenHai3PowerPlantislocatedinDuyenHai,TraVinhProvince.Whichthefoundationislocatedonmudlayerorseasandlayer.Rawgeographicalelevationis-2.37m,andundergroundwaterlevelis-3.8m.Mainhouseof#1unitincludesTurbinehouseandbunkerbay,axisA～Dis52.6m,axis0～9is91m.Theexcavationcushionbottomelevationforfoundationofmainhouseare-4.1m、-5.1m、-6.1m、-8.4m,theexcavationcushionbottomelevationforturbinehousefoundationis9.4m,thebunkerbaycushionbottomelevationis--6.1m.Asforelevationofsomefoundationisbelowundergroundwaterlevel,andexcavationisdeep,itisrequiredtostressondewateringfordeepfoundationpitandslopreinforcementtoensurethesafetyconstruction.2ReferenceStandardsandCodesUnifiedStandardforConstructionalQualityAcceptanceofBuildingEngineering（GB50300-2001）CodeforAcceptanceofConstructionalQualityofBuildingFoundation(GB50202—2002)CodeforEngineeringSurveying（GB50026-2007）3ConstructionPreparation3.1TechniquePreparationPrepare,reviewandapprovemethodstatementinaccordancewithprocedures.PrepareITPinaccordancewithacceptancestandard.Prepareconstructionstartreport,reviewedandapprovedbyrelateddepartments.Organizerelatedpersonnelfordrawingjointreviewandtechniqueenclosure,makingrecordandarchive.Beforestartwork,performtechniqueandsafetyenclosureforconstructors.Completesitehorizontalcontrolnetworkandlevelingpointmonitoringworkaccordingtothesurveyingcontrolpointsuppliedbyconstructionunit.3.2LaborPowerPreparationLaborrequiredbythisprojectisasfollowingtable:S.N.TypeofworkQuantityS.N.TypeofworkQuantity1Sitemanagementstaff27Excavatordriver42HSEPersonnel18Pilingmachinedriver23QCInspector19Otherstaff154Electrician2 5Surveyor46Truckdriver163.3MachineryPreparationMachineryandequipmentsbythisprojectisasfollowingtable:S.N.NameTypeQuantity(unit)Remarks1Loader12Hydraulicexcavator23Submersiblepump2.2kw174Dumptruck85LevelATO3216TotalStationNTS312R+17PilingMachineType4501Forsteelsheetpilingwork3.4MaterialPreparationPlasticfilm：4000m2；Sandbag：600m；Scaffoldings：7t；Fastening：1000pieces；Waterpipes：700m；12msteelsheetpiles：160pieces.Allabovematerialshallbetracedinthewholeconstructionprocess,andaddediffoundnotenough.3.5WorkingSurroundingsPreparationWater:leadfromPhase3steelfactorywaterpipes;Electricity:leadfromIIcabinetlocatedinthesouthwestofphase3#1boilerRoad:aconcreteroadusedfortransportationlocatesinthesouthwestoftheworkingsite;Temporaryroadsarebuiltbyactualdemandsbetweentheworkingsitewiththeconcreteroad.3.6WorkingSchedule 4MainMethod&TechniqueMeasures4.1ConstructionSequence&MethodsThesequences&methodsforvariousworkingpartsareasfollowingtable:S.N.WorkingPartContents&Sequence1BunkerbayexcavationExcavatedtothedepthof-6.1m,adoptslopeexcavation→usingplasticfilmtocoverslopesurface→aftertheexcavationiscompleted,drainageditch&pitaresetatthebottomofthefoundationforpumpingwater.2TurbinefoundationaxisA～BExcavatedtothedepthof-4.1m，adoptslopeexcavation→usingplasticfilmtocoverslopesurface→aftertheexcavationiscompleted,drainageditch&pitaresetatthebottomofthefoundationforpumpingwater.3ExcavationforTurbinefoundationBrowofsteelsheetpilesconstruction→Thefoundationofdepthto-9.4m，Therestadoptsslopeexcavation,verticalexcavationforBrow→usingplasticfilmtocoverslopesurface→aftertheexcavationiscompleted,drainageditch&pitaresetatthebottomofthefoundationforpumpingwater.See8.1fordrawingofthefoundationexcavation4.2SlopeTheslopeofthisprojectisas1：1.5accordingtotheCodeforAcceptanceofConstructionalQualityofBuildingFoundation(GB50202—2002);thedistancebetweentheboundaryofearthworkexcavationwithfoundationboundaryis:b=0.6+0.3+0.3+1.5h,whichhisexcavationdepth.Seefollowingsketchfordetails: Sincethesoilofthesitehasagoodstabilityitself,reinforcementmeasuresneednottobetakenfortheslopeduringexcavation.Theslopecoveredwithcolorbandclothpreventingfromrain.Asfollowingpic.shows:4.3SteelpileToassureconstructionprogress,thefoundationbythesideofBshouldbesupportedwithsteelsheetpiles。Accordingtothedataofexploration&themanufacturer’s,thetype&layoutoftheteelsheetpilesareasfollows:Type:12minlength（Seeattachment8.5forcalculation）,0.4inwidth,76.1kg/m,asfollowingpicture: Sitelayoutofthesteelsheetofpilesisaspicture8.1；Installguidepositioningbracket:itisinstalledforensuringtheverticalityandlevelofpiles.Theenclosingpurlinsareweldedby2piecesof20#U-steelsintwo-way,andtheheightforInstallingguidepositioningbracketis2.5m,twotheodolitesaresetforcontrollingtheverticality.Whentheinstallationiscompleted,thebeamsofguidepositioningbracketcannotbesunkanddeformedandshallkeepverticalintheprocessofsteelsheetpiling.Steelsheetpiling:thesteelsheetpilesshallbeinspectedbeforepiling,verticalfaceshallbeflatandalignment,andlockcatchshallmeetrequirements,andbefixedifnot.Meanwhileclosegroovebottomintipofpileswithgreasepaintedontoittoavoidmudintothelockcatch.Crawlercraneisusedforpiling,thesteelsheetpileswillbeliftedtotheinsertingpointbycranes,thelockcatchshallbeinalignmentwhenpitchingofpiles,pilecapandhardwoodmatwillbecoveredontopandpilednormally.Inordertoensuretheverticalityofpiles,thepilingshallbeperformedalongwiththeenclosingpurlinsbyusingtwotheodolitesforcontrolling.Whenstartpiling,thelocationanddirectionofthefirstandsecondpiecesofpileshallbeaccurateforthefunctionofguiding,theyshallbemeasuredforeverymeterintotheearth.Whenitreachestheheightofbracket,itshallbefixedbyweldingofsteelplatewithguidepositioningbracket.Afterthat,markthepositionofeachsteelpileonsteelenclosingpurlingsinconvenientofcorrectionatanytime.Ifthepileisinclinedinpiling,steelropewillbeusedforpullingthepiles,pulling,pilingandcorrectionbysteps.Whenthefirstrowpilingfinished,andbepiledtothedesigneddepthbysecondtime. 4.4DrainageofFoundationPitWatercollectionanddrainagebyditchesaretakenforfoundationpitdrainage,seefoundationpitdrainagedrawingforthedrainagefacilities.Bagscoveredwithplasticfilmonthetopofslopeareusedforstopwatertopreventoutsidewaterfromflowingintothepit.Thebagsshallbestackedcloselywiththegapfilledbyclayeysoil.Widthof300mmditcharesetatthepositionof600mmhigherthepitbottom,thedepthofditchatslopestartingpointis300mmandthegradientisin0.1%.600mm×600mmwatercollectionpitsaresetalongwiththeditch,thedistancebetweentwopitsisnomorethan30m.Thedepthofwatercollectionpitis500mmdeeperthantheditch.Andthewaterinthepitwillbepumpedoutside.Seeattachment8.2forwaterstop,ditchandwatercollectionpitarrangement.4.5FoundationPitMonitoringInordertoensuretheconstructionsafety,displacementandsettlementforsteelsheetpileshallbemonitoredintheperiodoffoundationexcavationandusing.Thelayoutofmonitoringpoints:onemonitoringpointissetonthemiddlesteelsheetpile,whichbothsidesof12mand24mawayarealsosetmonitoringpoints,thetotalquantityIs5,seeattachment8.3formonitoringpointslayout.Methodofmonitoringpoints:whentheconstructionofsteelsheetpilingiscompleted,onesmallholeonthetopofpiledrilledbynailisconsideredasthemonitoringpointfordisplacementandsettlement.Monitoring:Theinitialvalueshallbemeasuredinthe12hafterthecompletionoffoundationpitexcavation;Andinthe3daysaftertheinitialvaluemeasured,itshallbemeasuredonceineachday;andafterthatonceoneweek.Seeattachment8.4forTableofmonitoringrecord.5QualityAssuranceMeasures5.1OrganizationchartofQA/QCProjectManager ProjectChiefEngineerDeputyProjectDirectorProjectQualityinchargeSpecializedpersonforqualityinspectionofprojecttechnicalpersoninchargeSpecializedpersonforqualityinspectionTeamtechnicianSurveyingteamMaterialmanagementteamMachinerydispatchingteamUnskilledworkers5.2FlowchartofqualityproblemstreatmentIfanyqualityproblemisfound,itisrequiredtobetreatedasfollowingfindqualityproblemsorqualityaccidentconfirmtheprotectivemeasuresinvestigatethesaidaboveAnalyzecauseunclearimplementtheprotectivemeasuresclearInvestigatemore,andanalyzethecausefurthernoneedtotreattreatornot needtotreatconfirmtreatmentplandesignorconstructioninspectionandacceptanceconclusionsubmitthetreatmentplan5.3Specificmeasures5.3.1SurveyingandLayoutTotalstationandlevelusedforsurveyingshallbecalibratedwithcalibrationcertificate.Sidelineshallbere-surveyedintheprocessofexcavationtoassuretheaccurateexcavationposition.5.3.2Earthwork100mmaboveelevationoffoundationpitbasementshallbeexcavatedbymanpowertoavoiddisturbingthebasementsoilandloweringitsloadcapacity.Under-excavationandover-excavationarenotallowed.Ifover-excavationhappens,itshallbebackfilledwiththematerialpermittedbytheOwner/Consultant,andthecompactionfactorshallmeetthedesignrequirements.《ITPforEarthWork》shallbeimplemented.6SupplementofGuaranteeMeasurestotheSchedule6.1EstablishaStrictCensorshipforConstructionScheduleTheconstructionprogressandthetimeforeachkindofworkersjoiningintotheworkshallbecontrolledinaccordancewiththenetworkplan,themanagementshallarrangeconstructionsequencesinaccordancewithaggregatescheduling.Checkeverydayconstructionprogressandfinisheverydayworkinschedule,ensuretoday’sworkwillnotaffecttomorrow,thisprocesswillnotinfluencenext.Thesitemanagerwilltakecommandbyhimselfforkeypartwhichaffectschedule.6.2WarrantytheSupplyofMaterials&OutwardProcessingComponentsOrganizepersonnelmakingsubprojectanditemprojectanalysissheet,andprocessing,procurementandsupplyingplanformaterial,productionandsemi-production.Ensurethemachineryallocationworkandmaterialprocurementandsupplying.Determinetimeformaterialenter-siteaccordingtotheDrawingofConstructionSchedulingNetworkPlan.6.3TheCoordinationWorkBetweenCivilEngineering&EquipmentsInstallation Thecivilengineering&equipmentsinstallationworkingteamneedtocooperateinconstruction,andprotecteachother’sproductionandsemi-production.Acoordinationmeetingisrequiredtoholdbyprojectmanageronceaweektosolvetheproblemsforcooperationamongvariousofworks.Constructiongroupswithmanyyearsofconstructionexperienceareselectedforthisproject.Andcompletethemanagementorganization.Arrangelaborpowerandmaterialsupplyingreasonablyandimproveconstructionefficiencyaccordingtotheconstructionschedulenetworkplan.Distinguishprimaryandsecondarypartsaccordingtothethecharacteristicsofthisproject,interchangetheworkinaccordancewithconstructionsequencesandtechnologytoassuretheprojectisdoneonschedule.7Safety&CivilizedConstructionThepersonnelshallwearsafetyhelmetwhenenterintothesite.Alltheconstructorshallwearrequiredsafetyshoeswhenenterintothesite.Powerdistributionbyclassesandthree-phasefivelittlesystemforpowerdistributinglinearetakeninsite.Forbidtostaywirewithoutpermission.Onebreakforoneelectricequipment,oneleakagecircuitbreakerforonedistributionbox,usestandarddistributionboxtoensureelectricalSafety.Allspecialworkersshallholdcertificate.Wheninconcretepouring,goodinsulationsoftrubbercablesareusedfortheelectricwires,theswitchesandplugshallbeincompleteandgoodinsulation.Forbidtoinserttheelectricitywiresintothesocketdirectly.Thevibratoroperatorsshallwearrubbershoesandrubbergloves.Alltheconstructorsareforbiddentodrinkwinebeforeconstruction.Nosmokinginsite.Stopoutdoorconstructionwhencatchesstrongwind,thunderstormandothersevereweather.Noself-madeladderisallowedtouse,ifrequired,itshallbeacceptedandapprovedbysafetyengineer.Keepconstructionsiteclean,removerubbishandwastetimely,followtheprincipleof“workfinished,materialusedupandcleansite”.Setbarriersaroundconstructionarea,warningbarriershall≥1.5awayfromthesideoffoundationpit,andsetobvioussafetywarningsignsandplacardasfollowingpicture: 8AttachmentDrawing8.1Drawingofexcavationfor#1mainhouse8.2LayoutofDrainagemeasuresfor#1mainhousefoundationpit 8.3SteelSheetpilessurveypointslayoutfor#1mainhouse 8.4SurveyRecordforFoundationPit Owner：Consultant：SurveyRecordforFoundationPitContractorProjectName：SubdivisionalWork：BidNo.：ProjectNameSubdivisionalWorkLocationDateInstrumentwithNo.SurveyedbyPointCoordinateElevationDisplacementSettlementDisplacementSpeedSettlementSpeedXYSub-contractorZTPCEPCContractorCDSZConsultantPECC3OwnerTPMB3PositionSignatureFullName 8.5Calculationforsteelpilewall 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