6.1路基整修课件讲解

RoadbedConstructionTechnologySubgraderenovationandhandoveracceptanceTheoreticalknowledge一、ProjectqualityinspectionandacceptanceWheneachsubdivisionalanddivisionalprojectiscompleted,theconstructionqualityshallbeinspectedandacceptedaccordingtotherequirementsoftheapproveddesigndrawings,designdocumentsandtechnicalspecifications.RepairtheappearancequalityandlocaldefectsMeetthequalitystandardsandtechnicalstandardsspecifiedinthedesignspecificationsandtechnicaldocumentsRestoretraversepoints,markerposts,etcIftheselfinspectionisqualified,preparehandoverdataandapplyforhandoveracceptance.Theoreticalknowledge一、ProjectqualityinspectionandacceptanceAfterthecompletionofsubgradeworks,thehandoversurveyofthewholelinemustbecarriedout,includingmidlinesurvey,cross-sectionsurveyandelevationsurvey,whichshallbeusedasthebasisforhandoveracceptance.Beforethesubgradehandoverandacceptance,thesubgradeconstructionqualityshallbecheckedagaininstrictaccordancewiththespecificationrequirements,andtheappearancequalityandlocaldefectsshallberepairedortreated.ForSubgradeinspection,theconstructionunitandtheconstructionsupervisorshallinspectthesubgradecenterline,elevation,width,slopegradient,interceptinganddrainageditchsystem,etc.accordingtotherequirementsofthedesigndocuments.Preparetherenovationplanaccordingtotheinspectionresultsandrenovatethesubgradesurface,subgradeslopeanddrainagesystem.Thesubgraderenovationcanbestartedonlyaftertheinspectionresultsandrenovationplanareverifiedandapprovedbythesupervisingengineer.Theoreticalknowledge一、Projectqualityinspectionandacceptance1.SubgradesurfacerenovationFortherenovationofsoilsubgradesurface,machinerycanbeusedtocooperatewithmanualsoilcuttingorfilling,androllercanbeusedforrolling.Thecompactedthicknessofthesupplementedsoillayershallnotbelessthan100mm.Aftercompaction,thesurfaceshallbeflatwithoutlooseness,peelingandotherphenomena.Afterthesoilsubgradesurfacereachesthedesignelevation,itshallbeleveledbygraderorbulldozer.Whentheshoveledsoilisinsufficienttofillthedepression,itshallbefilledandcompactedwiththesamesoilasthesubgradesurface.ThesurfaceofStoneFilledSubgradeshallbecaulkedtightlyandflatwithstonechips.Thethicknessofthefinishedsubgradesurfaceshallbelessthan150cm,andthereshallbenopitsandloosestones;Looseorsemiburiedstoneswithasizegreaterthanl00mmshallberemovedfromthesubgradesurfacelayer,filledandcompactedasrequired.Therenovationofrockfilledembankmentandearthrockembankmentisbasicallythesameasthatofsoilembankment.Theoreticalknowledge一、Projectqualityinspectionandacceptance2.SubgradesloperenovationThesloperateofstoneexcavationsubgradeshallmeetthedesignrequirements.Looserocksanddangerousrocksontheslopeshallberemovedintime.Forsoilsubgradeslope,whenthecuttingslopeisscouredbyraintoformasmallgully,theoriginalslopesurfaceshallbeexcavatedintosteps,filledinlayersandcompactedcarefully.Ifthefillingthicknessisverysmall(100~200mm)butnottheslopereinforcementsection,themethodofgrassplantingandrenovationcanbeusedtofillwithplantingsoil,butitshouldbesmooth,beautifulandreliable.Theoreticalknowledge一、Projectqualityinspectionandacceptance2.SubgradesloperenovationTheslopeofdeepcuttingshallbetrimmedfromtoptobottomaccordingtothesloperequiredbythedesign,andtheslopeshallnotbesupplementedwithsoil;Forthesectionwheretheslopeneedstobereinforced,thereinforcementpositionandthicknessshallbereservedtomakethefinishedslopeconsistentwiththedesignslope.Whenthefillingslopeisscouredbyraintoformagullyorcollapsegap,thestepsshallbeexcavatedfrombottomtotop,widened,filledandcompactedinlayers,andthentheslopeshallbecutaccordingtothedesignslope.Theshoulderwaterretainingbeltshallbebuiltattheedgeoftheshoulderinsidethecurve.Aftercompaction,thefilledsoilshallbefreefromlooseness,softelasticity,churningandunevensurface.Ifitisunqualified,itmustbehandledagain.Theoreticalknowledge一、Projectqualityinspectionandacceptance3.RenovationofsubgradedrainagesystemTherenovationofsideditchshallbecarriedoutbyhangingline.Thelongitudinalslopesofvariousditches(includingthelongitudinalslopesofborrowpits)shallbecarefullyinspected.Thebottomoftheditchshallbeflatandthedrainageshallbesmooth.Ifitdoesnotmeetthedesignandrequirements,itshallberenovatedaccordingtotheregulations.Thesectionandslopegradientofinterceptingditch,drainageditchandsideditchshallbehandledaccordingtothedesignrequirements.Thesurfaceofthetrenchshallbeneatandsmooth.Thepitoffillershallbehammeredtightl