Method-Statement-for-Road-Works-(道路施工方案英文)

Page1of55Revision0METHODSTATEMENTFORROADWORKSPage2of55Revision0TABLEOFCONTENTSS.NoDescriptionPageNo1.0Scope32.0PermitsandLicenses33.0Methodology(SequenceofWorkForSurfaceWaterDrainageWorks)34.0HealthandSafety315.0RiskAssessment356.0EnvironmentControl397.0InspectionandTesting398.0SupervisionResponsibilities409.0Resources4010.0DrawingsandSketches4211.0ReferenceDocumentation4212.0Attachments43Page3of55Revision01.0SCOPEThepurposeofthisMethodStatementistodescribetheMethodologyinvolvedinconstructionofRoadWorksinaccordancewithprojecttechnicalspecifications,internationalstandardsandcodes,localrulesandregulations(QCS-2010).Thismethodstatementwillcoverthefollowingworks:EarthWorksPreparationtoRoadFormationGranularSub-basePreparationWorksAsphaltWorks2.0PERMITSANDLICENSESThePermitsandLicenserequiredforcommencementoftheworkshallbeobtainedpriorstartinganysiteactivities,thepermitsandlicenseshallbeobtainedfromtheFollowing:ElectricityandWaterAuthorityTel-communicationOperatorMunicipalityGovernmentMinistryofEnvironmentPublicWorkAuthority(Roads)3.0SEQUENCEOFWORKSFORROADS3.1SitepreparationPriortocommencementofwork,thecontractorshallobtaintherelevantworkpermitsfromClientThecontractorshallundertakeclearingofsiteinordertoremoveanyexistingvegetation;steel,concrete,unusedbuildingsidentifiedfordemolition,pipingdebris,loosewindblownsandandotherforeignmaterials.Allexistingstructures,foundations,etc.asindicatedaboveshallbeentirelydemolished,removed,transportedanddisposedofbythecontractortoadebrisyarddesignatedbyClient.Allsoftspotsleftshallbefilledwithsuitablematerialandcompactedasperspecification.Excavatedmaterial,ifany,andsuitableandapprovedbyClientforbackfillingshallbetransportedandplacedinfillareaswithinthelimitsofthework.Page4of55Revision03.2SurveyandSettingOut3.2.1SurveyMarkersSurveyMarkersshallbedurable,appropriatetolocationandintendeduse.SurveyMarkersshallbeclearlyidentifiableandprotectedfromconstructiontraffic.ForinstallationofaSurveyMarkerintoreinforcedconcrete,theJV'swillensurethatsteelreinforcementbarsaretobeavoided.EitherremovableanchorsorepoxyadhesiveshallbeusedasthemethodsoffixingBenchmarksareaparticulartypeofSurveyMarkersusedinthecontrolofelevation.Benchmarksshallhaveadomedsurfaceforunambiguousstaffplacement.PrimaryBenchmarksshallcompriseastainlesssteelboltsecurelyplacedverticallyintoaconcreteslab,orhorizontallyintoacolumn.Theprotrusionshallnotposeasafetyhazard.SurveyMarkersusedforhorizontalcontrolshallhaveanunambiguouspointabove(orbelow)whichasurveyinstrumentcanbepreciselycentered.Thepointshallcompriseeitherapunchmarkortheintersectionof2linesformingacross.Cross-headedroadnail(75mmlong)completewithacoloredwashershallgenerallybeusedasaSurveyMarker.3.2.2ControlObservation,AdjustmentandPresentationHomogeneoushorizontalandverticalsurveycontrolisrequiredpriortoanysettingout.Surveycontrolshallevolvefromthewholetotheparts.Wherepractical,allsurveypointswithinahorizontalsurveycontrolnetworkshallbeoccupiedandobservedfrom.Forcedcenteringtechniquesshallbeusedthroughout.Aroundofangularobservationsshallcomprisethemeanofobservationstakenonbothfacesofthetotalstation.Aminimumnumberof4roundsofhorizontalandverticalanglesshallbeobservedateachinstrumentsetup.Forcontrolwork,theangularspreadofhorizontalanglesshallnotexceed3’’ofarc.Distancesshallbemeasuredinbothdirections.Allrawdatapertainingtoeachsetupshallbeelectronicallyrecorded.Surveycontrolshallincluderedundantobservations.Observationnetworksshallbeprocessedusingthemethodofleastsquaresadjustmentandtheresultingresidualstotheobservationsshallbeinspectedformagnitude.Anylargeresidualsorerrorellipsesshallbeexaminedandappropriateremedialactionshallbetaken.Preciselevelingshallbedoublerunusingequalbackandforesightsateachinstrumentsetup.Levelingsightsshallneverexceed30meters.Onthegroundsurface,theContractorshallestablishstablebenchmarksadjacenttothesitesothatthedistancebetweenadjacentbenchmarksdoesnotexceed250meters.Page5of55Revision0Heightdatumtransferaccuracyshallbebetterthan2mmina30mdeepshaft.Thetransferofheightdatumshallbebyvariousindependentmeans.azimuthtransferfromsurfacetoundergroundshallbebetterthan3“ofarcandpointtransfershallbeaccuratetowithin2mm.Suchtransfersshallbebyvariousindependentmeans.At3monthintervals,theContractorshallconductacompletesurveyofallexistingsurveycontrol.Abound,A4sizesurveycontrolreportshallbesubmittedtotheEngineerforacceptancewithin2weeksofcompletingthefieldwork.TheconventionadoptedshallcompriseStationName,Easting,Easting,NorthingandElevationreadingfromlefttorightreportshallcontainthefollowinginformationreportshallcontainthefollowinginformation:datesofsurvey,fixedsurveycontrolandvalues,specificationofinstrumentationused,calibrationstatusofinstrumentationused,observationalacceptancecriteria,listoffinaladjustedco-ordinatesfindingsandconclusion.Attachedtothereportshallbetheobservations(A4printoutofelectronicbookingsheetorcustomizedspreadsheet),adjustmentwithresidualsandstationerrorellipses,tableofdifferencesinmmfrompreviousco-ordinatesandelevation