JTG-F71-2006-公路交通安全设施施工技术规范-en

PAGEJTGProfessionalStandardofthePeople’sRepublicofChina中华人民共和国行业标准JTGF71-2006TechnicalSpecificationforConstructionofHighwaySafetyFacilities公路交通安全设施施工技术规范IssuedonJuly7,2006 ImplementedonSeptember1,2006IssuedbyMinistryofTransportofthePeople'sRepublicofChinaPAGE1AnnouncementofMinistryofTransportofthePeople'sRepublicofChinaNo.16,2006NoticeonpublishingtheprofessionalcodesofSpecificationforDesignofHighwaySafetyFacilities(JTGD81—2006)andTechnicalSpecificationforConstructionofHighwaySafetyFacilities（JTGF71—2006）TheSpecificationforDesignofHighwaySafetyFacilities(JTGD81—2006)andTechnicalSpecificationforConstructionofHighwaySafetyFacilities（JTGF71—2006）havebeenissuedatthepresentandimplementedfromSeptember1,2006,theSpecificationforDesignandConstructionofExpresswaySafetyAppurtenances(JTJ074—94)shallbeabolishedsimultaneously.TheItem(1),(2)inArticle4.2.1,Item(1)inArticle4.2.2,Article5.2.1,Article5.2.2,Item(1)inArticle8.2.1arecompulsoryandmustbeenforcedstrictly.ThecompulsoryprovisionsofSpecificationforDesignandConstructionofExpresswaySafetyAppurtenances(JTJ074—94)inCompulsoryProvisionsofEngineeringConstructionStandardsHighwayProject(2002)shallbeabolishedsimultaneously.TheMinistryofTransportofthePeople'sRepublicofChinaisinchargeoftheadministrationandtheexplanationofthesetwocodes;theResearchInstituteofHighwayofMinistryofTransport,thedevelopmentorganization,isresponsibleforthedailyexplanationandadministration.Allrelevantorganizationsarekindlyrequestedtosumupandaccumulateyourexperiencesinactualpracticesduringtheprocessofimplementingthiscode.Therelevantopinionsandadvice,whenevernecessary,canbepostedorpassedontotheResearchInstituteofHighwayofMinistryofTransport.Itisherebyannounced.MinistryofTransportofthePeople'sRepublicofChinaJuly7,2006ThemeWords:issues,highway,specification,announcementIssuedbyGeneralOfficeoftheMinistryofTransportonJuly10,2006

ForewordInordertomeettherequirementsofhighwayconstruction,theMinistryofTransporthasissuedtheDocument[1999],No.739anddecidedtoreedittheSpecificationforDesignandConstructionofExpresswaySafetyAppurtenances(JTJ074-94)whichwasimplementedfromJune1,1994;andtheResearchInstituteofHighwaywasentrustedandinchargeofthework.Therecensionworkfollowedupthehighwayconstructionconcept"Safety,EnvironmentalProtection,Comfort,Harmony",anditiscarriedonthebaseofsumminguptheserviceexperienceofhighwaytrafficsafetyfacilitiesofChinafrom1994andborrowingideasfromoverseasrelevantstandardsandadvancedtechnology;itfullyincarnatedthemodusoperandiof"Peopleforemost,Safetyfirst".ThereeditedcodewasdividedintothreevolumesofSpecificationforDesignofHighwaySafetyFacilities,TechnicalSpecificationforConstructionofHighwaySafetyFacilitiesandDesignDetailsofHighwaySafetyFacilities.Afterreedited,theTechnicalSpecificationforConstructionofHighwaySafetyFacilitiesisdividedinto10chapters,theyare1GeneralRules,2PreparationofConstruction,3RoadBedGuardrails,4BridgeGuardrail,5TrafficSign,6TrafficGuideLine,7BarScreenandBridge-girderProtectiveFences,8Anti-dazzlingFacilities,9Delineators,10FloatingRail.Comparewiththeformercode,thescopeofapplicationofTechnicalSpecificationforConstructionofHighwaySafetyFacilitiesisexpanded,itisexpandedfromexpresswayandfirst-classroadtonewandremodeledhighwaysindifferentgrades;also,theconstructionmethodsofguardrailsindifferentanti-collisiongradesofSpecificationforDesignofHighwaySafetyFacilitiesarespecified;thecontentsrelatetotrafficsign,trafficguidelineandfloatingrailsareadded;thematurednewmaterialsandnewtechnologiesoftrafficsign,trafficguideline,barscreen,anti-dazzlingfacility,delineatorsandfloatingrailwhicharebroughtoutinrecentyearsareabsorbed,anditconnectsupproperlywithcurrentnationalandprofessionalstandardsandmakethestandardbeequippedwithdefiniteadvancements;inadditional,checkandacceptprevisionsareaddedinthiscode.Allrelevantorganizationsarekindlyrequestedtosumupandaccumulateyourexperiencesinactualpracticesduringtheprocessofimplementingthiscode.Therelevantopinionsandadvice,whenevernecessary,canbepostedorpassedontoRIOHTransportConsultantsLtd.,oftheResearchInstituteofHighwayofMinistryofTransport(Address:No.8,XituchengRoad,HaidianDistrict,100088,BeijingTelephoneE-mail:hx.iu@）fortheuseofnextrecension.ChiefDevelopmentOrganization:ResearchInstituteofHighwayofMinistryofTransportParticipatingDevelopmentOrganizations：RIOHTransportConsultantsLtd.,GuangdongProvinceCommunicationCo.,Ltd,BeijingZhongluanTrafficTechnologicalCo.,Ltd.ThiscodewaspreparedbyLiuHuixue,LiAimin,YangJiuling,TangZhengzheng,HuangChen,JiaRixue,ZhongJikai,TangWenjie,ChengNing,XuXuemin,GeShufang,YangFeng,ZhangZhi,ZhangWeihan,WuJingmen.Contents1GeneralRules 12PreparationofConstruction 13RoadbedGuardrails 23.1GeneralRequirements 23.2CableGuardrails 23.3CorrugatedSheetBeamsforGuardrails 53.4ConcreteGuardrails 74BridgeGuardrails 94.1GeneralRequirements 94.2Material 94.3ConstructionofMetalbridgeGuardrails 104.4ConstructionofWallTypeandBeamColumnTypeBridgeRailingofReinforcedConcrete 114.5ConstructionofCombinedTypeBridgeGuardrails 114.6ReceivingInspection 115TrafficSigns 125.1GeneralRequirements 125.2Materials 125.3Constructions 135.4ReceivingInspection 146TrafficGuideLines 156.1GeneralRequirements 156.2Materials 156.3Construction 156.4ReceivingInspection 167BarScreensandBridge-girderProtectiveFences 167.1GeneralRequirements 167.2Materials 177.3Construction 177.4ReceivingInspection 188Anti-dazzlingFacilities 188.1GeneralRequirements 188.2Materials 198.3Construction 198.4ReceivingInspection 209Delineators 209.1GeneralRequirements 209.2Materials 209.3Construction 219.4ReceivingInspection 2110FloatingGuardrails 2110.1GeneralRequirements 2110.2Materials 2210.3Construction 2210.4ReceivingInspection 23WordingExplanations 24PAGE24TechnicalSpecificationforConstructionofHighwaySafetyFacilities1GeneralRules1.0.1Thiscodeisformulatedwithaviewtoimprovetheapplicationeffectsofhighwaysafetyfacilitiesandensuretheconstructionqualityofhighwaysafetyfacilities.1.0.2ThiscodeisapplicabletoConstructionandrenovationhighways.1.0.3Theconstructionof1.0.4Theconstructionqualitysuperintendentoftheconstructionorganizationshallchecktheprojectbyhimself,andthesuperintendentshallcooperatewiththesupervisingengineertocheckandacceptaftertheprojectiscompleted.1.0.5Thepreparationbeforetheconstructionandactualconditionsoftechnology,constructionorganizingandconstructionmanagementworkunderconstructionmustbedonefortheconstructionofhighwaysafetyfacilities,andtherelevantprevisionsofthiscodeandtechnicalregulationsshallbemet.1.0.6Thematurenewtechniques,newprocess,newmaterialandnewfacilitieswhichareapprovedbythecompetentauthoritiesshallbeadoptedfortheconstructionofhighwaysafetyfacilities.1.0.7A1.0.8Asforthehighwaysafetyfacilities,theprincipleofCivilizedConstruction,ManufacturedinSafetyshallbefollowedupandthesafetyoperationspecificationshallbeobservedstrictly,furthermore,thesafeproductioninstructionshallbeenhancedandthemanagementsystemofsafeproductionshallbe1.0.9Asfortheconstructionofhighway2PreparationofConstruction2.0.1Theconstructionmanagementplanshallbecompiledaccordingtothetenderingandbiddingdocuments,constructioncontract,designdocumentandrelevantcodes.2.0.2Theconstructionsiteshallbepreparedwell,andtheconstructionmechanismandcalibrationtestmechanismshallbeinstalledandadjustedtoimplementthefieldinspectionandconstructionalmeasurement.2.0.3A2.0.4Allmaterialsshallbestor2.0.5Theconstructionmanagementplanshouldincludethefollowingcontents:compilationexplanation,constructionorganizations,constructionplan,constructionmethod,resourceplan,aggregateschedulingandprogresschart,qualitycontrol,safeproductionandenvironmentalprotection.2.0.6Theconstructionorganizationmustestablishandconsummatethequalityassurancesystem.3RoadbedGuardrails3.1GeneralRequirements3.1.1Thecompactnessofsub-gradesoilandgroundbearingcapacityofconcreteguardrailofthecableguardrailsandwaveformgirderguardrailsshallmeettherequirementsofdesigndocuments.3.1.2Theantiseptictreatmentshallbecarriedoutforallsteelmembers.TheantiseptictreatmentshallmeettherequirementsofcurrentnationalstandardSpecificationforSteelComponentsAnticorrosionofHighwayTrafficEngineeringAppurtenanceswithaserialnumberofGB/T18226unlesstherearecontraryprovisionsinthiscodeanddesigndocuments.Asforthefastenersandconnectingpieceslikescrewboltsandnuts,thethreadmustbecleanedandthecentrifugalseparationtreatmentmustbecarriedoutaftertheantiseptictreatmentisfinished.3.2CableGuardrails3.2.1Material(1)Unlesstherearecontraryprovisionsinthedesigndocuments,thedifferentkindsofmaterialsofcableguardrailswhichareusedonbothsidesofthehighwayshallmeetthefollowingprevisions:①Thecordage-usedwireropesshallmeettherequirementsofcurrentcodeGalvanizedStrandedWirewithaserialnumberofYB/T5004,theperformanceandtheconstructshallmeetthosespecifiedinTable3.2.1.Table3.2.1PerformanceandConstructofCablDiameterofthewirerope(mm)Single-wirediameter(mm)StructureNominaltensilestrengthofwirerope(MPa)Cross-sectionalarea（mm2）MakingmethodUnitweight（kg/m）183.863sections7cores≥1270134Allshallbetwistedright1.09②Thecomponentslikeendcolumn,intermediateendcolumn,intermediatecolumn,intervalkeeper,screwbolt,nutandgasketshallmeettherequirementsofQ235steelincurrentnationalstandardCarbonStructuralSteelswithaserialnumberGB/T700.③ThesteelplatewhishisusedforthebracketshallmeettherelevantrequirementsofcurrentnationalstandardHot-rolledPlainCarbonandLowAlloyStructuralSteelSheetsandStripswithaserialnumberof(GB/T912).④ThestayboltofropeendgroundtackleandgroundtackleaswellasthepinusedforfixingthecableshallmeettheprovisionsofNo.45qualitycarbonstructuralsteelsofcurrentnationalstandardQualityCarbonStructuralSteels(GB/T699).(2)Whenhot-dipgalvanizingantiseptictreatmentiscarriedoutforthecable-usedwirerope,themethodofmonofilhot-dipgalvanizingshallbecarriedout,andrelevantprovisionsofzinccoatwhosemassis250g/m2incurrentstandardofGalvanizedStrandedWire(YB/T5004).ThezincwhichisusedforcoatingshallmeettheprovisionsofzincofSpecialNo.1orNo.1inZincIngots(GB/T470).3.2.2Construction(1)Setting-out①Accordingtothedistributionofon-sitebridge-girder,archculvert,passage,routecrossandtunnel,thepositionofthecontrolledcolumnsshallbedeterminedand,andthespacebetweenthecontrolledcolumnsshallbemeasured,thenregulatethesettingpositionsofendcolumn,intermediateendcolumnandintermediatecolumnaccordingtothegivenreason.②Itissuitabletosurveythatifthefacilitieslikeundergroundlinesandstructuresexistunderthecolumnandtreatthemproperly.(2)Thesettingofendcolumnandintermediateendcolumneq\o\ac(○,1)Thecolumn,cockermegandsoleplateshallbeweldedintofirmtrilateralsupportsaccordingtotherequirementsofdesigndocument.eq\o\ac(○,2)Thepitexcavation,foundationinspection,foundationtreatmentandconcretecastingshallmeettherequirementsofTechnicalSpecificationsforConstructionofHighwayBridgesandCulverts(JTJ041).③Asfortheendcolumnsandintermediate-endcolumnsonthestructureslikebridge-girder,archculvert,passageandretainingwall,theembeddedfoundationshallbecarriedoutaccordingtotherequirementsofdesigndocument.(3)Settingofintermediatecolumn①Thepositioningoftheintermediatecolumnshallbeexact,thelongitudinalandhorizontalpositionsshallbeconsistentwiththehighwaylineform.②Asfortheintermediatecolumnswhicharelocatedintheearthfoundation,theduffing-and-buryingmethod,hole-drillingmethodordriving-inmethodmaybeadoptedfortheconstruction.Theelevationofthecolumnshallmeetthedesignrequirementsandtheendofthecolumnmustnotbedamaged.③Theintermediatecolumnsontheconcretefoundationmaybesetintheembeddedthimbleandfixedinfillingmortarorconcrete,orconnectedinanchorboltandbridge-girderbeltingprotectedleatherfoundation.(4)InstallationofbracketThebracketsontheintermediatecolumnorintermediateendcolumnshallbeinstalledexactlyaccordingtothestatedbracketserialnumberandcombinationinthedesigndocument.(5)Mountingofcableeq\o\ac(○,1)Cablesshallbemountedwhenthedesignstrengthofconcretefoundationoftheendcolumnandintermediateendcolumnachievesto80％andabove.②Cablesshallbemountedontheinnersideofthecolumn,rolledandplacedtoanotherendwithintermediatebracket.Itisstrictlyprohibithaulingthecablesforalongdistance.③Thecableononeendmaybeanchoredontheropeendgroundtacklewithwedgeorinthemethodofinfusingalloy,asshowninFigure3.2.2-1.Branch-SectionofCableBranch-SectionofCableWedgeCableCableAnchorheadofropeendFigure3.2.2-1Branch-SectionofCableandWedgeAnchoringeq\o\ac(○,4)Thereversiblechainblockorlever-typereversiblechaintightenershallbesetonanotherendcolumnorintermediateendcolumntostrainthecabletemporarily,asshowninFigure3.2.2-2.TheinitialtensionofcableguardrailsofClassAandBshallbe20kN,theinitialtensionofcableguardrailsinotherclassesshallmeettherequirementsofthedesigndocument.TightenerTightenerThebrokenlineshowsthestatebeforetightening.Figure3.2.2-2TemporaryTensioningCable⑤Theredundantcableshallbecutoffaccordingtothespecificationforropeendgroundtackles,asshowninFigure3.2.2-3.Thecutsurfaceofthecableshallbeverticalandregular,anditmustnotbeincompact.Thecablemaybeanchoredontheropeendanchorheadaccordingtotherequirementsof③inthisclause.TensecableCuttingsectionofcableTensecableCuttingsectionofcableFigure3.2.2-3CuttingPositionofCable⑥Thetemporarytensioningforcemaybeunloadedaftertheropeendgroundtacklesareinstalledontheendcolumnorendcolumn.⑦Thecableshallbemountedfromtoptobottom.⑧Therope-gripscrewboltsoneachintermediatecolumnandintermediateendcolumnbracketshallbetightenedupafterthecableisadjusted.3.2.3Receivinginspection(1)Theburieddepthofthecolumnmustnotbelessthanthedesignvalue.Whendiggingandburyingmethodisadopted,thebackfillingshallbetampedinlayersandachievetothestatedcompactness.Whenthecolumnsareembeddedintotheconcretefoundation,thefundamentalgeometricaldimensionandstrengthlevelshallmeetthedesignrequirements.(2)Thephenomenalikeobviousdeformation,incline,distortionorcrimpingshallnotappearonthetopofthecolumn.(3)Theropeendgroundtackle,bracket,rope-gripscrewboltshallbeinstalledcorrectlyandfixedfirmly.Thebracketcombinationshallbeinaccordancetothecategoryofthecableguardrail.(4)Thesurfaceblemisheslikegasbubbles,flake,missedplatingandscratchshallnotappearonthesurfaceofthesteelmember.(5)Thelineformofthelinearportionguardrailshallbeflatandthelineformofthecurvedportionguardrailshallbesmooth.(6)Theheightofthecolumnmiddleordinate,verticalityofthecolumn,cableshallmeetthedesignrequirements.3.3CorrugatedSheetBeamsforGuardrails3.3.1MaterialUnlesstherearecontraryprovisionsinthedesigndocument,specificationandqualityofdifferentkindsofmaterialwhichareadoptedforcorrugatedsheetsteelbeamsforguardrailofthehighwaysideandmedialdividersshallmeettherequirementsofCorrugatedSheetSteelBeamsforGuardrail(JT/T281),Thrie-BeamGuardrailforHighway(JT/T457)andColdFormedSteelHollowSectionsforGeneralStructure--Dimensions,Shapes,WeightandPermissibleDeviations(GB/T6728).3.3.2Construction(1)Setting-outofcolumns①Thesetting-outofcolumnshallbecarriedoutaccordingtotherequirementsofdesigndocument,anditissuitabletomeasurethedistanceandlocatebaseonthecontrolofcolumnpositioninbridge-girder,passage,archculvert,tunnel,medialdivideropening,emergencytelephoneopeningandtrafficinterchange.②Thedistancemaybeadjustedwithadjustingplatewhensettingoutforthecolumns,andtheremnantquantityofthespacingmaybetreatedindistributionmethod.③Itissuitabletocheckifthereisanyfacilitylikeundergroundlineordrainpipeexistsonthelocationofthecolumnorincompletesituationofearth-burieddepthonthestructuretop.(2)Installationofcolumn①Thecolumninstallationshallcoincidewiththerequirementsofdesigndocumentandassortwiththelineformofhighway.②Asfortheintermediatecolumnswhicharelocatedintheearthfoundation,thedigging-and-buryingmethod,hole-drillingmethodordriving-inmethodmaybeadoptedfortheconstruction.Theelevationofthecolumnshallmeetthedesignrequirementsandtheendofthecolumnmustnotbedamaged.a．Whenthedrive-inmethodisadoptedandover-depthisdroveandthesectionalcolumnmustbepulledoutandrectified,thenthewholeonemustbepulledoutandre-droved-inafterthefoundationiscompacted.Whenthecolumncannotbedrovedintoarequireddepth,itisstrictlyprohibittoweld-cutordrillthesectionofthecolumnaboveground,andthesawed-offcolumnmustnotbeused.b．Whenthediggingandburyingmethodisadopted,goodmaterialshallbeadoptedforthebackfilling,andthebackfillingshallbetampedinlayers;thecompactnessofthebackfillingshallnotbelessthanthedesignspecifiedvalue.Asforthepostholeoftheenrockmentroadfoundation,itshallbebackfilledingranularmaterialsandtamped.c．Whenhole-drillingmethodisadopted,thebackfilledmaterialwhichisthesametotheroadfoundation'sshallbeusedtotempedinlayersafterthecolumnislocated.③Whenthecolumnissetonthesectionwhereispavedtheground-surface,a5cmunderfromtheroadfoundationtothesurfacecoatshallbebackfilledinthematerialwhichissametotheroadfoundation'sandtampedinlayers;theresidualsectionshallbebackfilledinthematerialwhichissametothepavement'sandtamped.④Asforthecolumninthestoneworkingarea,theconcretefoundationshallbesetaccordingtotherequirementsofdesigndocument.⑤Thecolumnsintheconcretefoundationoffootbridge,passageandculvertwithouttop-fillmaybesetintheembeddedthimbleandfixedinfillingmortarorconcrete,orconnectedinanchorboltandbridge-girderbeltingprotectedleatherfoundation.⑥Aftertheinstallationofcolumnisfinished,itshorizontalandverticaldirectionsshallformsasmoothlineform.⑦Thecolumnsontheguardrailtransitionsectionandendshallbeinstalledaccordingtothedesignstatedco-ordinate.(3)Installationofobstructionblock,bracketandtransversebeam①Theobstructionblockandbracketshallbefixedbetweentheguardrailplateandcolumninconnectingbolts,theobstructionblockandbracketshallbeadjustedinplacebeforetighteninguptheconnectingbolts.AsforthecorrugatedsheetbeamsforguardrailwhoseanticollisiongradeisSA,SAmorSS,thetop-layercolumnshallbeinstalledatthesametimewhentheobstructionblockisinstalled;thelineformshallbesametotheunder-layercolumn.②Asforthemedialdividerguardrailwhichissetwithtransversebeam,thetransversebeamshallbeinstalledafterthecolumnislocatedexactly.Theconnectingboltsbetweenthetransversebeamandcolumnshallnotbetightenedupprematurelybeforetheguardrailplateisinstalled.(4)Installationofthebeam①Theguardrailplatesshallbeconnectedinspliceboltsandformintoalongitudinalbeamandfixedontheobstructionblock,bracketortransversebeaminconnectingbolts.Thesplicingdirectionoftheguardrailplatesshallbeinaccordancewiththedirectionoftravel,asshowninFigure3.3.2.Thespliceboltmustbehigh-tensilebolt.DirectionoftravelDirectionoftravelFigure3.3.2SchematicDiagramofSplicingDirectionfor②AsforthecorrugatedsheetbeamsforguardrailwhoseanticollisiongradeisSA,SAmorSS,theup-layerbeamandup-layercolumnshallbeconnectedwiththescrewbolts.③Whenthespacebetweenthecolumnsisirregular,itmaybeadjustedwithadjustingplateorbeam,itisrequestnottocuttheguardrailplateonsite.④Allconnectingboltandspliceboltshallbetighteneduponlyafterthelineformofguardrailachievestothestatedrequirements.ThefinalscrewingtorqueshallmeetthosespecifiedinTable3.3.2.Table3.3.2SpecifiedValueofFinalTwistingbyTorqueMethodofConnectingBoltandSpliceBoltofCorrugatedSheetBeamsforGuardrailPTypeofscrewboltDiameterofscrewbolt(mm)TorqueValue（N.M）CommonboltM1660~68M2095~102M22163~170High-tensilebolt315~430(5)InstallationofEndAllsortsofguardrailendsocketsshallbeconnectedfirmlyinspliceboltandguardrailplate,thespliceboltmustbehigh-tensilebolt.AsforthebeamonthecorrugatedsheetbeamsforguardrailwhoseanticollisiongradeisSA,SAmandSS,theendmustbetreatedaccordingtotherequirementsofdesigndocument.3.3.3Receivinginspection(1)Theburieddepth,foundationspecification,earthfoundationcompactness,endandtransitionsectiontreatmentoftheguardrailcolumnshallmeettherequirementsofdesigncodeanddesigndocument.(2)Thecolumnposition,columnmiddleordinate,verticalityandcenterheightofbeamshallmeetthedesignrequirements.(3)Theerosionresistantcoatingofallcomponentsshallnotbedamagedastransportingandconstructing.(4)Theobviousconcaveconvexandfluctuationmustnotappearonthelinearportion;theguardrailofthecurvedportionshallbesmoothandinharmonywiththelineform;thelineformofendsocketguardrailofmedialdividershallcoincidewiththerequirementsofdesigndocument.(5)Theoverlappingdirectionofcorrugatedsheetbeamsslabshallbeexact,theoverlappingshallbeflat,gasketshallbereadyandboltsshallbefirm.(6)Theinstallationofobstructionblock,bracket,transversebeamandendsocketshallcoincidewiththerequirementsofdesigndocumentandinstalledinplace,theobviousdeform,torsionandinclinemustnotappear.(7)Thecorrugatedsheetbeamsplateandcolumnmustnotbeweld-cutanddrilledonsite.(8)Thecolumnandpostcapmustbeinstalledfirmly,theflawslikeobviouscollapsedside,deformandcleavageshallnotappearonitstop.3.4ConcreteGuardrails3.4.1Materials(1)Materialsusedforconcretemanufacture,forexamplecement,fineaggregate,coarseaggregate,mixingwater,additiveandsteelbarshallmeettherequirementsof"TechnicalSpecificationsforConstructionofHighwayBridgesandCulverts"(JTJ041).(2)SteelpipepileshallmeettheperformancerequirementsofQ235steelasdefinedincurrentnationalstandard"CarbonStructuralSteels"(GB/T700)unlesstherearecontraryprovisionsindesigndocument.3.4.2ConstructionConstructionofconcreteguardrailshallmee