衡重式、仰斜式挡土墙施工方案-英文版

'QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECMETHODSTATEMENTFORRETAININGWALLWORKSSECTION1A–KINGSTONTOLINSTEAD321Rev.DateStatusPreparedByReviewedByConstructionManagerApprovedByProjectManagerPage3of12 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECREVISIONTABLEPAGEREVISIONPAGEREVISIONAPPENDIXREVISIONABCDEABCDEABCDE126A227B328C429D530E631F732G833H934I1035J1136K1237L1338M143915401641174218431944204521462247234824492550Page3of12 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECSECTIONCONTENTSTITLEPAGE1SCOPEOFMETHODSTATEMENT42SCOPEOFWORKS53EQUIPMENTANDMATERIALS53.1Equipment53.3Materials64REFERENCEDOCUMENTS64.1Specifications64.2DesignReport64.3DesignDrawing74.4InspectionandTestPlan75CONSTRUCTIONANDOPERATIONSEQUENCE75.1-5OperationsSequence7-126ACCEPTANCEREQUIREMENTS136.1VisuallyTestingandAcceptableTolerance136.2TestFrequency137ENVIRONMENTANDSAFETY14APPENDIXA-ENVIRONMENTALRISKASSESSMENTAPPENDIXB-SAFETYRISKASSESSMENTAPPENDIXPage3of12 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHEC1SCOPEOFMETHODSTATEMENTThetypesofretainingwallincludes：InclinedEmbankmentRetainingWall--4606.0m³/100mofC20rubbleconcrete,InclinedEmbankmentshoulderRetainingWall--1723.1m³/80mofC20rubbleconcreteandbalanceweightretainingwall--14625.9m³/905mofC20rubbleconcrete：Table1-EmbankmentRetainingWallCHAINAGELENGTH（m）C20RUBBLECONCRETE（m³）TYPESDRAWINGNO.K7+200~K7+260604606.02INCLINEDS1-3-28Table2-EmbankmentShoulderRetainingWallCHAINAGELENGTH(m)C20RUBBLECONCRETE（m3）TYPESDRAWINGNO.K6+910~K7+0601502082.1BALANCEWEIGHTS1-3-28K8+540~K8+620801723.1INCLINEDS1-3-28K12+873~K12+940671358.5BALANCEWEIGHTS1-3-28K13+380~K13+440601463.1BALANCEWEIGHTS1-3-28K14+700~K14+9002003157.8BALANCEWEIGHTS1-3-28K15+050~K15+090401106.6BALANCEWEIGHTS1-3-28K15+200~K15+3101101298.9BALANCEWEIGHTS1-3-28K15+340~K15+38040711.7BALANCEWEIGHTS1-3-28K15+715~K15+76045691.8BALANCEWEIGHTS1-3-28Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECK15+787~K15+9801932755.4BALANCEWEIGHTS1-3-282SCOPEOFWORKSTheconstructionprocedureisshownasbelow：2.1Constructionpreparation2.2Measurementlofting2.3Excavationofthefoundationpit2.4Bearingcapacitytestingoffoundation2.5Formwork2.6Installationofdrainpipe2.7Concretepouring(placingrubblestone)2.8Removalofformwork2.9Concretecuring3EQUIPMENTANDMATERIAL3.1EquipmentNo.EquipmentnameBrandandmodelparameterquantityunitremark1ExcavatorPC350198KW,loadcapacity1.9m31setWithhook2ExcavatorPC220150KW1setHydraulichammer3LoaderSHANTUISD16092KW，3ton1.8m31set4BatchingplantHZS5050m³/h1set5DumptruckZHONGQI19.32m3，340horsepower2set6ConcretetruckZHONGQI8m³2setPage14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHEC3.2Material3.2.1C20rubbleconcrete20955m³3.2.2Φ50mmPVCpipe8074.3m3.2.3Rubblestone5238m³3.2.42cmBoard3.2.5Pre-buryingRebarofBarrier4REFERENCEDOCUMENTS4.1Specification《GuideSpecificationsforHighwayConstruction,9thEdition》807sectionretainingwalland808sectionconcretestructure4.2DesignReporti)PreliminaryGeologicalInvestigationReport-OutlineDesignVolume0ii)EnvironmentalManagementandMonitoring（EMMP）:CHEC-EMMP-S3-001iii)MethodStatementErosionControl/SedimentMangement（DocumentNo.EC-SM002）iiii)QualityPlanCHEC-NSH-QP-0002-Diiiii)CalculationSheetforRetainingWalls(tobedeveloped)Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHEC4.3DesignDrawingsDrawingsmaybeupdated;insuchcasetherecentrevisionwillbeused.ROWGeneralLayout—ReferrenceNo.S1-3-28Sub-GradeCrossSections—RefernceNo.S1-3-28RetainingWallDetails—ReferenceNo.S1-3-284.4InspectionandTestPlanInspectionandTestPlanforRetainingWallWorks(tobedeveloped)5CONSTRUCTIONANDOPERTIONSEQUENCE5.1ConstructionPreparation5.1.1Drawingexaminationandoriginallandscaperetest,ifanyincorrectdrawingorsiteinconsistencywithdesignisfound,makeatimelyreportandarrangereview.5.1.2Makeshiftroadconstruction，preparationofmaterialstackingfieldandmaterialpreparation,Constructatemporaryconstructionaccess,furnishmaterialstackingyardandsparematerials.5.2SurveyandStaking-out5.2.1Carryoutsurveyandstaking-out,andidentifythelineofexcavationboundary.5.2.2Disposeallweeds,rubbishandotherobstructionwithinthescopeofretainingwall;digdrainageditcharoundfoundationtrench,andeliminatesurfacewater.Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHEC5.2.3Makegooddrainagearrangementbeforebaseexcavation,duringwhichkeepdrainageinagoodcondition,ensuringthatwaterhazardispreventedduringconstruction.5.3ExcavationofTrenchFoundation5.3.1Basedonthesitegeologicalcondition,theexcavationoffoundationtrenchshallbecarriedoutinsectionbyexcavatorandhydraulichammer.Whenmechanicalexcavationreachesto10cmabovethedesignedfoundationelevation,restartthesurveyandstaking-out.Andthentheexcavationoffoundationshallbeexcavatedandcleanedmanuallytoensurethatthefoundationcomplieswiththedesignandspecificationrequirements(bearingcapacityofretainingwallfoundationshallcomplywiththefollowingrequirements:1.Forthesandysoilandsandclay,thebearingcapacityshallnotbelessthan250KPa.2.Forthesoftyrock,thebearingcapacityshallnotbelessthan350KPa.3.Forthetoughrock,thebearingcapacityshallnotbelessthan500KPa.)5.3.2Paycloseattentiontoslopestabilityduringexcavation.Ifthereisanycrackonthetopsurfacesoilofthepitedge,reliablesupportshallbeprovidedimmediately.5.3.3Thesloperateoffoundationtrenchisdeterminedbysitegeologicalconditionandexcavationdepth,andthereshouldbetiltedwithslopeonfoundationbottom,withintherangeof0.2:1(sloperatecanbeproperlyloweredifrocklayerandexcavationdepthisnotdeep),butthedetailedconditionshallbedeterminedbydrawing.Foundationexcavationdimensionisasfollowing:Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECDrawingB2referstothewidthofretainingwallfoundationbottom,1：nisrepresentingexcavationsloperateoffoundationpit,andnisdeterminedaccordingtogeologicalcondition;gravelsoil:n=0.75,yellow(clay)soil:n=0.5,rockn=0.3.5.3.4Whenfoundationpitexcavationreachestothedesignedelevationspecifiedinthedrawing,bearingcapacitytestshouldbeconductedforfoundationbottom.Ifitdoesnotsatisfiesthedesignrequirement,afoundationtreatmentplanshallbeproposedinaccordancewithactualdrilling(digging)andsoiltestingdata,andsubmittedtoCHECProjectforreview,andrevisedaccordinglyasperhis/herinstruction.WithoutpriorapprovalfromCHECProject,concretecastingormasonryworkisnotallowedforexcavatedfoundationpit.5.4FoundationWallCasting5.4.1Conductsurveyandstaking-outshallbebasedondrawing,andthenidentifyfoundationdimension.5.4.2FormworkErection1)Thesteelformworkshallbeadopted,andtheformworkwithpartsmissingorbrokenisprohibitedusing.Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHEC2)Makesurethedesign,shape,dimensionandmutuallocationofconcretestructureandeachpartofcomponentsshallbecorrect.3)Theformworkshallpossesssufficientstrength,rigidityandstabilitytostandthegravityandlateralpressureofnewly-castconcreteaswellasvariouspossibleloadsarisingduringconstruction.4)Thereshallbenocementslurryleakagebetweenformworkjoints;contactsurfacebetweenformworkandconcreteshallbeclean,andafterwardsreleasingagentshallbeapplied,whichshallnotaffecttheperformanceofformwork.Theformworkshallbecleanedupandstoredasperrequirementafterdismantling.5)Theformworkadopts50rackpipesashorizontalbandandverticalband,bothspacing50cm,theflankofformworkisfixedtotheslopeoffoundationtrenchwithadjustabletopsupport,withsupportspace90cm.Firstassembleformworkinpieces,thenassembleinsectionaccordingtothelocationofsettlementjoint,aftereachsectionassembly,adjustformworkstraightdegreewithlinesonthefoursides,fixitonlyaftermeetingthequalityrequirements.Inordertoensuretheinternalwidthofformwork,woodsupport,havingthesamethicknesswiththewall,issetinsidetheformworkasinternalsupport,arowofboltspenetratingthewallissetattheupper,middle,bottom,andonesupportisaddedtotheupperofformworkforanchoring.5.4.3ConcreteCasting1)Thefollowingpreparationshallbemadebeforecastingconcrete:Priortoconcretecast,fixformwork,levelandtightenjoints,cleandebris,anddischargepondingwater.2)Theslumpdegreeofconcretesenttositeshallbetestedfromtimetotime,forthosenotmeetingtherequirementsshallbereturnedtothebatchingplantforreprocess,andaddingwaterrandomlyisprohibited.3)Theconcreteshallbecastinlayer,withthicknessnotexceeding1m,andtheconstructionjointshallbotberandomlyleaved.Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHEC4)Concreteplacementshallbeconductedcontinuously.Whenitstopsduetocertainreasons,theintervalshallbelessthansellingtimeorreshapingtimeofpreviouslayerconcrete.Whendumpingconcretefromhigherlocation,thefollowingrequirementsshallbesatisfiedinordertopreventconcreteseparation:theheightshallbecontrolledwithin2m;iftheheightisover2m,aconduitorchuteshallbeputintouse.Duringconcretecast,concreteshallbevibratedfromtimetotimetomakeituniformlydense,andvibrationisrecommendedtobecarriedoutverticallybyimmersionvibrator.Fastinsertionandslowwithdrawshallexecuteduringvibration.Seamlessvibrationandnon-defectsontheconcretesurfacearerecommended.Therubbleplacedintoconcreteintherubbleconcreteretainingwallshallsatisfythefollowingrequirements:（1）Rubbleintensitylevelshallnotbelessthan30Mpa.（2）Maximumsizeforrubblestoneshallnotbemorethan1/4ofitsdepthofthelayer,andtheminimumsizeoftherubblestoneshallnotbelessthan15cm.（3）Rubbleshallbewashedcleanbeforeplacing.（4）Rubbleshallbeplacedevenlyandsecurely,netdistancebetweenrubbleshallnotbelessthan15cm,notlessthan25cmbetweenrubbleandformwork.（5）Thetopsurfaceofuppermostrubbleshallbecoveredbyconcretelayer,withthicknessnotlessthan25cm.（6）Rubbleshallbeplacedmanually,andspecialattentionmustbepaidtorubblesoasnottodamageformworkandPVCpipe.（7）Thevolumeofrubbleshallnotexceed25%ofthetotalvolumeofrubbleconcrete.Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHEC8)Afterconcretecastcompletion;coveritwithgeotechnicalfabricforcuring,whosedurationwillnotbelessthan7days.5.4.4ConstructionJointsTreatment1）Stalagmiteshallbeplacedateachconstructionjoint,toenhanceconcreteadhesioncapacity.2）Artificialchiselingshallbecarriedoutatthesmoothspotofconstructionjoint,chiselingareagreaterthan80%ofthetotalarea.5.5WallBackfillingandWeepHoleandSettlementJointArrangement5.5.1Clayshallbeusedforbackfillingundertheoutletofeachlayer,15cmdeepforeachlayerand30cmhighinall,andthentampedmanually.Onelayerof30cmnaturalgravelfilterlayerisfilledintoretainingwallback,thecontentofnaturalgravel＜5%.5.5.2Whenintensityofwallconcretereachmorethan70%ofthedesignedintensity,backfillingforretainingwallbackshallbeconductedtoensurethequalityofwall.5.5.3Wallbackfillingshallbeconductedandtampedinlayerby15cm.Forthepartwhichcan’tbetampedbyroller,artificialelectrictampingcompactionisrecommended.5.5.4Forthewallaboveground,outletshallbesetalternatelyeach2m.Theoutletentrance’slocationshallbestrictlycontrolledtoensurethattheirlocationisaccurate,instraightlines. Φ50mmPVCpipeshallbeembeddedintotheoutletandextendedto10cmdeepofwallback,andgeo-textileshallbeusedforpackingattheend’s20cmpoint.Thebottomofoutletshallbe30cmhigherthantheground,andpermeablegeo-textileshallbeappliedtotheinlet.Atthesametime,controlwaterslopeoftheoutletat4%duringconstruction,ensuringsmoothdrainageoftheoutlet.5.5.5Onesettlementjointshallbeprovidedateach10-15minterval,with2cmwidegap.Andthegapshallbefilledbyasphaltoakum,15cmdeep.Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHEC5.5.6Thematerialshallbecompactedaftertheexcavationofretainingwallcompleted,andwhichsurfaceshallbecoveredbyM7.5，thickness30cmandwidth3mrubblestone.6QUALITYTESTINGSTANDARD6.1VisuallyTestingandAcceptableTolerance《GuideSpecificationsforHighwayConstruction,9thEdition》DIVISION700MATERIALREQUIREMENTS《GuideSpecificationsforHighwayConstruction,9thEdition》SECTION801EXCAVATIONANDBACKFILLFORMAJORSTRUCTURES《GuideSpecificationsforHighwayConstruction,9thEdition》SECTION808CONCRETESTRUCTURES《GuideSpecificationsforHighwayConstruction,9thEdition》SECTION809REINFORCINGSTEEL6.2TestingFrequency《GuideSpecificationsforHighwayConstruction,9thEdition》DIVISION700MATERIALREQUIREMENTS《GuideSpecificationsforHighwayConstruction,9thEdition》SECTION801EXCAVATIONANDBACKFILLFORMAJORSTRUCTURES《GuideSpecificationsforHighwayConstruction,9thEdition》SECTION808CONCRETESTRUCTURES《GuideSpecificationsforHighwayConstruction,9thEdition》SECTION809REINFORCINGSTEEL《InspectionTestPlans》（ITP）Page14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECAttachedlistconcreteretainingwallinspectionitemNo.InspectionItemtoleranceTestingmethodandfrequencyremark1△SubgradebearingcapacityComplywithdesignstandardpenetrometer：everysection　2△Strengthofconcrete(MPa)Strengthofsample　3Planlocation(mm)WithinthequalifiedstandardTotalstationinstrument:3spotforeach20m　4Elevationoftopsurface(mm)±20Levelinstrument:1spotforeach20m　5Verticality(%)0.3Hangingverticalline：2spotforeach20m　6△Dimensionofcrosssection(mm)NotlessthandesignstandardTapemeasure：inspect2sectionforeach20m，selectivetest2counterfort　7Elevationofbottom(mm)±30Levelinstrument:1spotforeach20m　8Surfaceevenness(mm)52mstraightedge：2spotforeach20m　7ENVIRONMENTANDSAFETYPage14of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECAPPENDIXAENVIRONMENTALRISKASSESSMENTPage18of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECNATUREOFRISKASSESSMENT:ConcreteRetainingWallREFERENCEPOTENTIALHAZARDPOTENTIALCONSEQUENCESCONTROLMEASURESWORKACTIVITIES1.Nointerceptingdrainagefacility2.Damagetovegetation3.Wastewater4.Fugitivedust5.Solidwaste6.Noise7.Vibration8.Woodlandoccupancy1.Soilerosion,debrisflow,landslide2.Soilerosion,debrisflow,landslide3.Riverandundergroundwatercontamination4.Airpollution5.Environmentpollution6.Damagetohearing,disturbancetocommunity7.Damagetobuilding,disturbancetocommunity8.Soilerosion1.Provideinterceptingdrainagefacilitybeforeandduringconstruction2.Provideinterceptingdrainagefacilitybeforeandduringconstruction,andrestorevegetationaftercompletion.3.Dischargewastewaterafteritsdisposal4.Sprinkleandcover5.Gathercollectively6.Operatorwearsearplugtoprotecthearing;arrangenoiseworkinaspecificperiod.7.Provideearthquake-proofzone,workinaspecificperiod8.ProvideinterceptingdrainagefacilityEQUIPMENTCLEANING1.Chemicalwaste1.Contaminationofground&water1.EnsureequipmentisonlywashedatthedesignatedlocationinthesiteyardtoensurechemicalwasteiscollectedbytheinterceptorGENERALACTIVITIES1.Waste(sewage)2.Waste(generalrefuse)1.Contaminationofground&water2.Harboringofpests3.Unsightlyappearanceofenvirons1.Provideappropriatesanitaryconvenience.2.Provideappropriategarbagecollectionreceptacles.3.PutsuitablemeasuresinplaceinaccordancewithEnvironmentalManagementandMonitoringPlansuchasproperhousekeepingandwastemanagementPage18of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECAPPENDIXCSAFETYRISKASSESSMENTPage18of19 QualityManagementDocumentNo.CHEC-NSH-MS-009RevMethodStatementforRetainingWallWorksCHECNATUREOFRISKASSESSMENT:ConcreteRetainingWallREFERENCEPOTENTIALHAZARDPOTENTIALCONSEQUENCESCONTROLMEASURESAccess1.Unauthorized/Accidentalaccess1.Injuriestopersonnel2.Damagetoequipmentandworks(slope,bench,etc.)alreadydone1.Workingareatobeproperlydemarcated.2.TrafficmanagementTrenchsupport1Slopeprovidedatpitandtrenchdoesnotmeettherequirements2Nodrainagefacility3.Noaccess,orunsatisfactoryaccess4Incorrectsoil,materialandtoolheapingdistancetotrenchandsloperate1.Collapsing2.Collapsing3.Fallingobjects4.Collapsing1.Conductsupportingasperdesign2.Faciliatedrainagefacility3.Providespecialaccessandensureaccesssafety4.Transporttimely,satisfyslopeanddistancetotrenchedgesafetyrequirementsManualretainingwall1.Workoverlap2.Walkontheslope3.Hugerubble1.Objectstrike2.Fallingobjects3.Objectstrike1.Nojointingcanbeconductedbelowwhileconstructionproceedsabove.Nobodyshallstandunderneath.2Useladderforaccessingandwalkontheslopeisnotallowed.3.Maximumweightforrubble50kgFormwork1.Formworkandothermaterialsheaping2.Formworkandothermaterialslifting1.Fallingobjects2.Fallingobjects1.Formworkshallbeheapedsteadily.2.Providechuteorline,tiethelinestightly.Page18of19'