工程施工方案英文Method statementWord文档下载推荐.docx

工程施工方案英文Method statementWord文档下载推荐.docx

《工程施工方案英文Method statementWord文档下载推荐.docx》由会员分享，可在线阅读，更多相关《工程施工方案英文Method statementWord文档下载推荐.docx（27页珍藏版）》请在冰点文库上搜索。

1.1.2.2SubgradeExcavation

1）Excavationofunsuitablematerialsandetc.

Usingexcavator,loaderanddumptrucksforremovingunsuitablematerialswhichwillbedisposedatplacedesignatedbytheEmployer.

2）Excavationworks

Excavationwillbecarriedoutsectionbysection.

Thecommonexcavationshallbeperformedbyexcavator,loaderanddumptruck.Asforrockexcavation,acrawlermounteddrillingmachinewithaircompressorwillbeemployedforshallowholeblastingoperationtosplitandloosetherock,theexcavatedmaterialswillberemovedanddisposedbydumptruck.

Theprocessflowofcommonexcavationisasfollows:

Demarcatingtheexcavationlineaftersurvey→originalgroundclearance→mobilizingequipmentintoposition→excavationanddisposal

Theprocessingsequenceofrockexcavationbyblastingoperation:

Surfaceclearance→drillingmachineinposition→drillingbydrillingmachine→chargingthehole→blasting→inspectionandclearance

Sincetherockexcavationoftheprojectis22143m3involume,someexperiencedandcompetentexpertswillbeassignedforconductingandsupervisingtheentireblastingoperation,soastoensurethesafetyandefficiency.

1.1.2.3SubgradeFilling

1）EarthFillingworks

Fillinginhorizontallayersandcompactioninlayersshallbeusedinconstruction.Thethicknessofeachloosefillinglayer.Fillingmaterialshallbedeliveredtothesiteby16m3dumptrucksandleveledfirstlybybulldozersandthenbygraderforpreciselevelingafteritisfilledinfillingarea,andthenrolledwithvibrationandstaticcompactionbyusingsingle-drumvibratoryroadrollersandstaticrollersrespectively.Smallcompactorshallbeusedwhererollercannoreach.

Duringconstruction,thicknessforeachlayer,leveling,watercontent,andcompactionscopeandnumberofcompactionshallbecontrolledstrictly.OnlywhenthepreviousworkisapprovedandacceptedbytheEngineerafterinspection,thenfillingofnextlayercanbemade.Pileupfillingbydumptruckoroverfillingisnotallowed.Thespoilisrequiredtobeleveledandcompactedtopreventenvironmentalcontamination.

Theconstructionworksshallbeproperlyarrangedtakingdueaccountofrainyseason,soastoavoidworkinginrainydays.

Flow-chartforfillingworksofsubgradeearthwork:

Inspectionandaccepted

2）RockFilling

Rockfillshallbeusedforfillinginsoftgroundareas,asforculvertsandwallbackfilling,rockfillingmaterialtobeusedshallbeselected.Siltandsoftmaterialswillberemovedbeforefilling.

Constructionmethodoffillingandcompactinginlayersshallbeadoptedforrocksubgrade.Thicknessoffillingandcompactionforeachlayershallbecontrolledwithin250mm.

Flow-chartforrockfillingofsubgrade:

Unqualified

Constructionmethod:

Excavatorsanddumptrucksshallbeusedforloadingandtransportation,bulldozersinlargehorsepowershallbeusedforlevelingandgrading,jointfillingbymanuallabor,andsingle-drumvibratingrollersandsteelrollersshallbeusedforcompaction.

2.2ConstructionMethodforCementstabilizedNaturalGravelSubbaseCourse

1）Constructionplan

Mixtureusedforcementstabilizednaturalgravelsub-baseinthicknessof250mmshallbemixedatmixingplant,andpaverwillbeusedforsubbaselayinginoneoperation.Tocoverthefullwidth,pavingshallbeperformedbypaverintwotimes.Andcompactionshallbedoneusingavibratingrollerandatyredroller,theworkmanshipofshoulderwithsubbasematerialisassameasthatforcementstabilizednaturalgravelsubbase.

2）ConstructionFlow-chart

（i）flow-chart:

Cementbatching&

delivery

Commissioningofplant

Gravelbatching&

convey

Mixing

Materialtest

Discharge

Materialpreparation

Water

Sampling

（ii）Flow-chartforpavingandcompaction:

MixtureTransportation

Curing&

Trafficcontrol

JointTreatment

compaction

Paving

Settingout

Surfacepreparation

preparion

Addwaterwhennecessary

Trialsectionandsummary

ApprovedbytheEngineerforconstruction

3）Controlonmajorworkmanship

（i）Preparations

Theacceptanceinspectiononsubgradeshallbecarriedoutinaccordancewiththespecificationsandrelatedqualityacceptancestandards,thelevelness,width,transversegradeandcompactnessandwatercontentshallmeettherequirementsofspecifications.Surfaceshallbefreeofdustanddebris,anditshallbekeptwetbywateringbeforeconstruction.

（ii）Settingout

Theroadcenterlineshallbereinstated.Stakesshallbesetupat10mintervalsonstraightsectionsandat5mintervalsincurves,andreferencestakesshallbesetup,too.Levelsurveyshallbecarriedoutforlevelcontrol.

（iii）MaterialsPreparations

ComponentmaterialsshallbepreparedasperthemixdesignapprovedbytheEngineerpriortoconstruction,andwhichcannotbechangedwithoutapprovalbytheEngineer,soastokeepstability.

（iv）Mixing

Thecomponentmaterialsofcementstabilizedgravelforsub-baseshallbemixedatmixingplants.ThemixingwillnotstartuntilthemixproportionsatisfythedesignrequirementandapprovedbytheEngineer.Aspecificpersonwillbeassignedforcontrollingthecementandwaterproportioningduringmixingoperation.Thereadymixedmixturemustberightinbatching,wellmixed,thegrainsizeofaggregateandgradingrangeshallmeetthemixingdesign.

（v）Transportation

Dumptrucksshallbeusedfortransporting.Haulagecapacitymustmatchwithmixingcapacity.Inordertoensureacontinuoussupply,moredumptrucksshallbedeployedforthistask.

（vi）Paving

Apaverwithanautolevelingdeviceandvibratingcompactionfunctionshallbeemployedforthejob.Loosecoefficientshallbeobtainedfromtrialsectionandspeedofpavingshallbecontrolledinconformitywithrateofmixingandsupplyofthestabilizedgravel.Thesegregationofthemixtureifanyafterpavingwillbedealtwithbymanuallabor.

（vii）Compaction

Thecompactionplanshallbeworkedoutaccordingtothewidthoftheroadandwidthandrangeoftheroller’swheels.Compactionshallbemadeundertheprincipleofbeginningwithlightcompactionfollowedbyheavycompaction,beingslowatstartandspeedingupgradually,andstartingatthelowestplacesbeforecompactionathigherplaces,andthecompactionshalloverlapwith1/2wheelwidthoverthepreviouscompactionrut.Therearwheelofrollershallrolloverthejointbetweentwostrips.Surfaceshallbekeptwetallthetime,onwhichwatershallbesprayedifwaterisvaporizedtoofast.Itisnotallowablethattherollerturnsaroundsharplyorbrakessuddenlyoncompletedsectionsorsectionswhichisbeingcompacted.Thecompactnessshallbecheckedpromptlyaftercompaction.Additionalcompactionshallbeperformedshouldthecompactnessisfoundinsufficient.Thetimeforcompactionshallbecontrolledtakingdueaccountthenatureofcementstabilizedmacadam,thecompactionshallbecarriedoutbeforethefinalsetofcementandthecompactnessshallbemetwithoutremainingobviousruts.

（viii）JointTreatment

Immediatelyafterpavingandcompaction,alevelingrulershallbeusedtocheckthesmoothnessofthesurface.Straightandverticaltransversejointsshallbecutmanuallyandsomematerialsshallbeplacedoverthecutjointforthepurposeoftrafficpassing,andothersurplusshallbeclearedaway.Longitudinaljointsshallbeavoidedasmuchaspossible.Incasealongitudinaljointisnotavoidable,itshallbecutstraightandvertically.

（ix）Trafficcontrol

Aftercompactionofsubbasewhichmeetvariousindexupontestandinspection,notrafficotherthanconstructionequipmentshallbeallowedtorunover.

4）Measuresforensuringthequalityofsub-base

（i）ThepreparationofrawmaterialsshallbecarriedoutstrictlyinaccordancewithspecificationsandasinstructedbytheEngineer,andproportionofmaterialsshallbewellcontrolled.

（ii）IncompliancewiththespecificationsandtheinstructionsbytheEngineer,andself-inspectionshallbemadebythecontractor.

（iii）WorksshallbecarriedoutinatrialsectionwiththemethodapprovedbytheEngineerpriortopracticalconstruction,whichwillbeconductedwiththeloosepavingfactor,optimumwatercontent,thearrangementofequipmentandmeansofconstructiongainedfromthepracticeinthetrialsection.

（iv）Thesurfaceshallbecleanedfreeofdustanddebrisbeforeconstruction,anditshallbekeptmoistbywatering.However,theworksshallbestoppedifitrains.

（v）Specificpersonshallbeassignedatthemixingplantforcontrollingandmonitoringproportionofcementandwatercontentsothatabnormityshallbeadjustedpromptlyifitoccurs.

（vi）Pavingthicknessshallbewellcontrolledandcompactionmustbemadefully,soastoensurethatcompactionthicknessmeetsrequirementsofspecifications.Thecompactedareashallbecoveredwithgeotextileaftercompaction.

（vii）Inspectionshallbeperformedonlevelness.