基坑开挖换填施工方案1123 英文版.docx

基坑开挖换填施工方案1123 英文版.docx

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基坑开挖换填施工方案1123英文版

SokotoCementFactoryProjectofthe17thBureau,ChineseRailwayConstructionCompany

ConstructionSchemesforFoundationpitExcavationAndReplacement

Composedby：

Editor：

Chiefeditor：

Fifthdivisionof17thBureauofCRCC,managerdepartmentoftheSokotoCementFactoryProject,Nigeria

23thNovember2104

Contents

1Introduction１

1.1Basisforthecomposition１

1.2Principlesforthecomposition１

2.1Location１

2.2Geographicreport２

2.3Groundwaterandundergroundwater.２

3Constructiontechniquesandmethods２

3.1Excavationofthefoundationpit２

3.1.1Gradientofthefoundationpit３

3.1.2Thestabilityofthesideslope３

3.1.3Theformofexcavation４

3.1.4Preparationfortheexcavation５

3.1.5Constructionprocedures６

3.1.6Methods６

3.2Gravelreplacement７

3.2.1Constructionmaterial７

3.2.2Constructionpreparation８

3.2.3Techniquesandconstructionalprocedure.８

3.2.4Methods９

4Organizationofconstructionandlogisticwork１１

4.1Themanagingsystemforconstructionorganization.１１

4.2Humanresourcesfortheconstruction１１

4.3Logisticwork１２

4.4Technicalguarantee１２

4.5Qualityandtechniquesstandardandregulation１２

4.5.1Qualitystandard１２

4.5.2Qualitymonitoringorganization１３

4.5.3Raisingawarenessfortheimportanceofqualityandprofessionalskills.１３

4.5.4Establishingqualitymanagementcode.１３

4.6Safetytechniquesmeasures１４

4.6.1Safetyregulationsformechanicalconstruction１４

4.6.2Trafficregulations１５

4.6.3Safetyregulationsforfillingconstruction.１５

4.7Environmentprotectionmeasures１６

4.8Constructionduringtherainseason１６

4.8.1Collectingweatherdata１６

4.8.2Technicalmeasuresfordrainage１６

4.9Technicalmeasuresforsandstorm１７

4.10Contingencyplan１７

ConstructionSchemesforFoundationpitExcavationAndReplacement

1Introduction

1.1Basisforthecomposition

1.1.1GeographicReportfortheSOKOTO3300T/DClinkerDryCementProductionLine

1.1.2DrawingssubmittedbytheOwner

1.1.3UnifiedStandardforConstructionalQualityAcceptanceofBuildingEngineering（GB50300-2001）。

1.1.4CodeforAcceptanceofConstructionQualityofFoundationEngineering（GB50203-2002）。

1.1.5TechnicalSpecificationforGroundTreatmentofBuilding（JGJ79-002）。

1.1.6TechnicalSpecificationforSafetyOperationofConstructionMachinery（JGJ33-2001）。

1.1.7CodeforInvestigationofGeotechnicalEngineering（GB50021-2001）。

1.1.8Statusofthesiteandsurroundingenvironment

1.1.9Calculationbookforconstructionengineering

1.2Principlesforthecomposition

1.2.1SignificantlyunderstandingtheBasisforthecomposition,composingwithintheframeofthepreviouscontractinthespiritofintegrity,subjectivityandtechnicalinnovationality.Developingexecutable,scientificandefficientconstructionschemesinthoroughconsiderationofthestatusofthesiteandotherprofessionaldrawings

2.Introductionoftheproject

2.1Location

ThesiteonwhichtheprojectistobecarriedoutlocatesinNorthCementFactory,Sokoto,Nigeria,adjacenttotheoriginalcementproductionline.Thesizeofthesiteis700metersby600meters.WiththehigherSouthendandlowerNorthend,thesiteconsistofthreestages:

114m,109mand105mrespectively.

2.2Geographicreport

InaccordancewiththegeographicreportprovidedbytheOwner,theexcavationinvolvesthreedifferenttypesofsoil.

Artificialfilllayer（Q4ml）（stratumnumber①）

Softsoilthatwidelyspreadsaroundthesite.Thickness:

0.3～11.5.Layerbottomelevation88.85～111.25m。

Clinosol（Q4dl）（stratumnumber②）

Themixofgravellysoilandcohesivesoilofbrownishredcolor.Thickness:

0.23～19.0m.Layerbottomelevation82.1～109.99m。

Cohesivesoil（stratumnumber③）:

thesoiloflightgrayoryellow-graycolorandgoodsolidity.Medium/lowcompressibility.Characterizedbythehardcalcareouscore.Thickness:

3.25～24.83m，Layerbottomelevation75.27～87.99m。

2.3Groundwaterandundergroundwater.

Thesiteisgoingtousewaterfromundergroundwiththedepthofsevenmeters.Waterisaccessedtothroughwell.Theprecipitationamountissignificantlylowexceptinrainingseason,whichlastsfromJulytoSeptember.Thedrainagefacilitiesareneededfortheheavyprecipitation.

3Constructiontechniquesandmethods

3.1Excavationofthefoundationpit

Inconsiderationofthefeaturesofthesoilandthegeographicreport,itwasprimarilyconcludedthatlayer-by-layerslopeexcavationshallbeappliedforallbuildingsandstructuresfoundationpits.Incasethattherearebuildingsorstructuresthatrequiresupportforthesideslope,thenotherdesignshouldbemadeavailablefortheconstructionofthesupport.

3.1.1Gradientofthefoundationpit

1）Laterite　　C=15Kpaφ=8.4degreeγ=19.7KN/M

2）Shale　　C=20Kpaφ=11.4degreeγ=26KN/M

ItisnotedinthedesigndrawingsthatthedepthofthedeepfoundationpitHisnomorethan10meters,whichfallintotwocategoriesintermsofdepth:

0m≤H≤5m，5m≤H≤10M。

Basedontheequationonthepage41ofCalculationbookforconstructionengineering,thestableslopeangleiscalculatedtobenomorethan73degrees.Thegradientofthegradingissetat1/0.5onaccountofthesafetycoefficientandvehiculardisturbance.

Specificweightofthesoil（kg/m3）

Angleofgradient（°）

Internalfrictionangleofthesoil（°）

Cohesiveforceofthesoil（kg/m3）

Whenthesoilisinthestateoflimitequilibrium,themaximumheightofthesideslope（h）canbecalculatedthroughthisformula.

3.1.2Thestabilityofthesideslope

Thesafetycoefficientis1.13basedonthediagrambelow,whichmeetstherequirementofthedesignandregulations.

Thetextabove:

safetycoefficient:

1.13（Swedenfiniteslicemethod,totalstressmodel）

3.1.3Theformofexcavation

Accordingtothedesigndrawing,excavationofthefoundationpitshouldbeconductedintwodifferentformscorrespondingtodifferentdepthH:

H≤5m，5m＜H≤10m.Thedetailsarepresentedbelow.Incasethattheexcavationdepthismorethan5meters,aone-meter-wideplatformshouldbecreatedwhentheexcavationreachesthecushion.

3.1.4Preparationfortheexcavation

1）Technicalpreparation：

a）Elevationbenchmarkhasbeenintroducedtotheconstructionareaonthebasisofelevationpointgivenbytheconstructionunit.

b）Otherpreparationworkincludegettingfamiliarwithdrawingsandgeographicalstatus,plantingaxis-controlpile,checkingundergroundpipeline,machineries,completingdisclosurework.

2）Sitepreparation：

a）Double-checkingoriginalcontrolplantsandbenchmark,layingoutpositioningline,settingupperimeterforfoundationpitexcavationlineandsideslopeline.Theexcavatedlateriteshouldbeputinasecurelocationwithinthesiteforthepurposeofbackfilling.ShaleshouldbedumpedintothedumpinggrounddesignatedbytheOwner.

b）Properlypreservingthefoundationpit,examiningthestabilityofthesideslopebeforeexcavating,mendingpartiallydamagedsideslopetoensurethestability.

c）Organizingmachineriesandworkforcetoenterthesiteinatimelymanner.Threeexcavators,onewheelloaderandsixtippersaretocoordinatewiththetransportation.Excavator,wheelloaderandtipperneedtobecheckedbeforedrivingtoensurethereliability.Alldriversshouldbeproperlylicensedandallmachineoperatorsshouldobserverelevantregulationsformachineoperating.Afterthevehicleisstarted,panel,light,alarmsteeringsystem,brakeandothernecessarypartsshouldbeexaminedforreliabilityandsensitivity.Fuel,lubricatingoilandhydraulicoilalsoneedtobecheckedtoensurethequality.Hingingparts,connectorsrequirecheckingforlooseningandhydraulicpressuresystemandhydraulictransmissionsystemforleakage.Loadingpeopleinthegrappleandviolatingdrivingregulationarestrictlyforbiddenandsubjecttopenalty.

d）Constructionschemesareopentoadjustmentbroughtupbythechangingsituationonthesiteormajoramendmenttothedrawing.

3.1.5

Surveyingandpositioning

riskeliminating

groundclearing

machineryentry

excavating

mendingandmaintainingsideslope

（continuingexcavatingandmaintaining）

flatteningthefoundationbase

testing

proceedingtonextstage

Constructionprocedures

3.1.6Methods

1）Aftersurveyingandpositioning,theexcavationlineonthehillcrestistobelaidoutandexcavatedbybackhoe.

2）Theexcavationworkshouldbeconductedlayerbylayeronbothsideofthesideslope.Toensurethestabilityofthesideslope,allexcavatedearthworkshouldberemovedouttimely.Forrectangularorpolylateralfoundationpit,thenumberofexcavatorandothervehiclesaretobedeterminedbythesizeanddepthofthefoundationpit,

3）Theelevationdemandsconstantattention.accuratemeasurementbythedumpylevelisrequiredasitisabouttoreachthedesignelevationtopreventover-excavating.Standingwithintheturningradiusofmechanicalarmwhileitisoperatingisstrictlyprohibited.Theexcavatingshouldbecarriedoutinorderandtheexcavatedearthworkneedtoberemovedastheexcavationgoeson.However,poorlyprotectedworkerarenotallowedtoworkinthesamespotasthemachine.Significantilluminationfacilitiesshouldbeinplaceifitisconsiderednecessarytoworkatnight.Onespeciallydesignatedtechnicianshouldberesponsibleforconductingexcavatorsandothervehicles.Thefoundationpitneedstobethoroughlyexaminedbyaninspectorforgeneralstabilitystatusandunstablefactorssuchascracksandsliding.Anyfactorthatmightleadtomajordamageshouldbeimmediatelyreportedtotheprojectmanager,whileinthemeantimetheconstructionneedstobesuspendedforevacuation.

4）Thetre