底基层施工准备及注意事项.docx

底基层施工准备及注意事项.docx

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底基层施工准备及注意事项

底基层施工准备及注意事项（Preparationandnoticeofbottombaseconstruction）

Subbaseconstructionpreparationandprecautionsof.Txt

Theroadintheconstructionprocess,affectedbymanyfactors,weather,temperature,hydrologicalandmechanicalequipment,constructionmethod,aremoreorlessofthisorthatproblem,oftenappearsomequalityproblemsinoperation,suchaspartoftheroadsurfaceconstructioniscompleted,rigidpavementbrokenslabcracks,flexiblepavement,therewillbesevereinthebag,frothing.Althoughtheseproblemsnolongerexistaftertherectificationofqualitydefects,butrevealedaproblemintheconstructionoftheroadconstructionisoftenattachedtotheroadsurfaceconstructionquality,butignoretheconstructionqualityofthebase.Becausethefracturesurfacelayer,thesurfacelayerBuseeenoughofaproblem,theessenceandtheconstructionqualityiscloselyrelatedto.Theroadsurfaceconstructioniscompletedandbasecloselytogether,theloadonthesurfacelayermainlyrelyonthegrassrootstobear,dispersion.Theconstructionqualitywilldirectlyaffecttheservicelifeoftheroad.

1constructionpreparation

1）acceptanceoftheroadbed.Soilroadbedsurfaceshouldbeflat,solid,withprescribedsurfaceheight,crown,roadbedwidth,roughness,compactnessetc.shallmeetthestandardrequirements,qualifiedon-sitesupervisionengineersignedtheapprovalprocess.Wheretheacceptanceofsections,measuresmustbetakentoreachthestandard,beforetheconstructionofcementstabilizedlayer.

2）constructionmachineryandequipment.Theconstructionequipmentofcementstabilizedsoilwithgrader,rollerandwatertankers,eachworkinggroupshouldbeequippedwith1graders,1rollerand3watertankers,tankersnumberaccordingtothesizeofwaterqualityadjustment.Tradersintheprojectconstruction,constructionmachineryisthebestcombinationoftwoworkgroupswiththehomework,namely2graders,2rollers,5watertankers,itsavesawatertruck,andtheconstructionefficiencyisfastandcanensurethequalityofconstruction.

3）cementpreparation.Thecementshouldbeusedinthefinalsettingtimeislonger,thelowergradeofPortlandcement,Portlandcement,slagcement,etc..

4）proportionofcementstabilizedsoil.Inthelaboratoryofsoilsampling,cementinspection,test,samplepreparation,accordingtothespecimenmaintenance7dunconfinedcompressivestrengthtestresultsobtained.Differentaggregatesforeachsoilpile,wearesamplingtodothetest,thecementcontentis1%,2%,3%differenttestmatch,weselectedthefieldsoilissandysoilofdifferentgrade,thehighestamountofcementis3%,thelowestwas2%.

5）thecalculationofmaterialconsumption.Accordingtotheroadbedwidth,thicknessandpredetermineddegreeofcompaction,calculatetheaggregateweightofeachstemneed,accordingtothewatercontentofaggregateandmaterialtransportvehicletonnage,pervehiclematerialstackingdistance;accordingtothecementstabilizedlayerthicknessandthepredetermineddrydensityandthedosageofcement,cementstabilizedsoiltocalculate1m2cementweight,andcalculatetheperbagofcementpavingarea,calculatedperbagofcementverticalandhorizontalspacing.

6）testsection.Thetestsectionistotesttheconstructionscheme,thecementstabilizedsoilwithanimportantmeans,determinationofthicknessandmechanicalpropertiesofvirtualpavingconstruction.Bythecontractorwiththeengineeraccordingtothesitevisit,acommonchoiceoftheroadisrepresentativeandtypicalsoilastheexperimentalsections,preparedbythecontractorconstructionplansubmittedtotheEngineerforapproval.

Inthetestsectionconstruction,shouldbetargetedtocollectthethicknessandthedegreeofcompactionandrollingmachinerythroughtherelationshipbetweenthenumberofdata,thetestsectionafterthepreparationoftestroadconstructionsummary,inordertoguidetheoverallconstruction.

2process

Totransportmaterial,constructionloftingpaving,pavingthickness,checkthematerialmanualarrangementforpavingcement,cementground,drymixing,wetmixing,sprayingshaping,rolling,seamsandthetreatmentandhealth.

3technicalrequirements

1）basemeasurementline.Backonbothsidesofthesubgradeheightanddirectionofthelinecontrolsurveyofpiles,eachpilewitha20m.Carefullychecktheelevationofpileheightnail.Thetopis11.4mwidePasayhighwayroadbed,roadbedfillthetotalheightofabout1m~2m,somostofthemeasuringdistanceofpilecenterline10m.Ofcourse,accordingtotheactualsituationisdifferent,canchoosedifferentdistance.

2）transportationandpaving.Thetransportmaterial,thepredeterminedstackinglowerinthecompostbeforewatering,makeitmoist.Aggregateloading,shouldbecontrolledalmostthesameamountofmaterialpervehicle,accordingtothecalculateddistancematerialswillbeunloadedtothemiddleoftheroad,dischargedistanceshouldbestrictlycontrolled,toomuchortoolittletoavoid,bythepersoninthefieldofcontrollingthedischarge.UnloadmaterialaftertheGraderwillfeedoutflat,pavingthicknessdeterminedbytesttodeterminethecoefficientofloosepaving,pavingafterbytheforemanresponsibleforelevationpilecheckmaterialthickness,ifnotsuitabletoadjust.

3）pavingcement.Goodintheaggregateshopstalls,accordingtothecalculationoftheperbagofcementandcementwellspacing,placingmarkersperbagofcementintheaggregatelayer,anddrawthepavingcementline.Cementfrommanufacturerswhenthegoodsshippeddirectlytothesite,theequipmentshippedcementshouldberain.Thecementwithtrayscatteredontheroadside,thedaybeforetheafternoonstablelayerconstructionusingartificialperbagofcementshippedtomarkthelocation,checkformissingandexcess.Inthestablelayerconstructiononthemorning,openthebagofcementinthegraderbeforestartingtowork,willfallinthecementaggregatelayer,thenusethegraderbladeinfrontofthecementevenlyspreadout.Eachbagofcementpavingpavingcementequalarea,afterthesurfaceshouldbenoblank.

4）drymix.Withploughgraderbehindwillbepavedcementstirringfortwotimes,thecementdistributiontoaggregate,butnotploughintheend,inordertopreventthecementintothebottom.Thefirsttimetheroadcenterbegan,themixtureturnedtothemiddle,andmechanicalspeed.Secondtimesinstead,frombothsidesbegantomixtorollover.

5）wetmix.Drymixafterwateringwetmiximmediately.Infrontofthesprinklersprinkler,sprinklerwithgraderaftermixing,theuniformdistributionofwaterinthemixture,inarelativelylargelongitudinalslopesectionsshouldbecloselymatchedtoreducewateroutflow.Wetmixshouldbegininthemiddle,infrontofthegraderbladewillturntothematerialonbothsidesofthesubgrade,andthenturntothetwosidesofthesubgradematerialbythemiddleoftheroad,andfinallythematerialoutflat,wetmixatleast3times;sprinklerwateringshouldbecontinuous,notinterrupted,wateringshouldbelongdistancesome,shouldthespillatthewaterwheelandtheotherendat2morbeyondthemixinghead.ThesprinklerisshouldnotbeaU-turninthemixingandmixingontheroadandtheplantostay,topreventthelocalwateristoolarge;andintheprocessofmixingwater,watercontentofmixtureshouldbetimelycheck,

Thewatercontentoffastdeterminationofwatercontentofmixture,butalsointhefieldofartificialcontrol,theoptimummoisturecontentofthemixturetosqueezeintothegroupinthehand,fellonthegroundtospreadout;theprocessofmixingwatering,butalsowithartificialsortingoversizeparticles,removethecoarseandfineparticlesandthe"nest"localtoowetortoodryplace;markmixingiscompleted,noashashmixturegroupandflowersurface,noparticle"nest"andthewaterrightuniform.

6）rolling.Aftershaping,whenthemixtureattheoptimummoisturecontentrangeof1%,immediatelybyrollervibrationabove12tforcompactioninroadbedinfullwidth.Linesegments,frombothsidesoftheshoulderintothecenteroftheroadroller;flatcurvesegmentsbythemedialshouldertoexternalshoulderrolling.Inshort,fromlowtohighgraduallyrolling.Whenrolling,crossrollingwheelrequireshalfwheel,rollerforwalkingspeed

1.5kmh~2.0kmh,degreeofcompactionofsubgradeincreases,increasingtherollingspeed.Roundtripisover,thegeneralrollingseveraltimes.Thefirstpressing1times,thenthevibrationpressureof3to5timestoreachtherequirednumberofrollingafterdetectionbytestpersonneldensity,unqualifiedshouldcontinuerollinguntilqualified;compactionafterpassingthefinalpressureagaincan.Thefullpictureoftherollingrequirementsduringtherollingprocess,noleakagepressure,allpartsoftherollingfrequencyshouldbethesame,thewidthoftheroadonbothsidesshouldbeappropriatetoincreasethenumberofrolling;rollingprocessshouldbeappropriatetothesurfaceofthecementstabilizedsoilwatering,keepwet,hotmixtureevaporationofsurfacewateristoolarge,shouldbetimelywatering,increasingwatersprinkling;rollingprocess,ifthereis"spring",loose,peelingandotherphenomena,shouldbereopenedorreplacementofartificialmixingmixtureisnew,soastomeetthequalityrequirements.Combinedwiththeconstructionsite,whenrollingpressureacrossthedividinglinebetweenabout4m,ensurethecompactnessofthecombinationof.

7）health.Eachsectionofthecementroadrolleriscompleted,shallimmediatelyproceedtohealth.Theultimatestrengthofcementsoilformedafteralongtime