教案設(shè)計(jì)說明書

ROADGUARDBARRIERTheroadguardbarrier,6feetlong,3.5feethigh,2feetwideatbase,withitspatenteddesign,istheonlybarrierofitstypethatselflockswithouttheneedforadditionalNobarrier,otherthantheroadguardbarrier,canself-lockwithouttheneedofadditionalapparatus,suchasacable,strap,rodorcoupler.Inaddition,theroadguardbarrier,becauseofitsuniquepatenteddesignallowsforcurvedconfigurationsofupto15degreesateachbarrierconnection,ineitherdirection,whileremaininglockedtotheadjacentbarrier.Nootherbarriercanmakethatclaim!Also,theroadguardbarrierisdesignedfortheadditionofsignsscreensandflashersbecauseofthebuiltinslotsforsuchdevisesandiseasiertomaneuverbecauseofitsweightandtwocarryingslotscontainedineachbarrier.Thepatentedinteriordesignoftheroadguardbarrierpreventsbulgingandkeepsitsside’sstraightandtrimwhilemaintainingaweightofonly125lbs.Emptybutasecure1675lbs.Theroadguardcornerconnectorbarrierisdesignedforusewiththeroadguardbarrierasaconnectingbarrierunittoallowforeitherleftorrightangleturns,orbothsimultaneously,ofbetween75to105degreeswhilelockingtogetherallconnectingbarriers.Inaddition,thecornerconnectorbarrierallowsfortheinitialroadguardbarrierlinetocontinueafterconnectingbarrierlineextensionstotheleftand/ortheright.Lightweightandeasytohandle,theroadguardcornerconnectorbarrieris2feetinlengthandwidthand3.5feetinheight,designedtocorrespondwiththeroadguardDirectlybeneaththefillingholeoftheroadguardcornerconnectorbarrierisapinextendingupwardinternallyfromthebottomofthebarriertosecurefirmlyapoleorpipethatcanbeinserteddownwardthroughthefillinghole.Saidpoleorpipecanbeusedtoattachsignage,privacyscreensorsecuritypanelsthatextendabovethebarrierlineheight.Theroadguardhighwayassemblyisareinmentsystemforhighwaybarriersthatdistributeandtransfersthatmayoccuruponimpactofavehiclesothattheoverallhighwaybarriersystemwillhavegreaterstrengthandintegrity.TheroadguardhighwayassemblysystemmeetsallNCHRP350,TestLevel3TruckandCarCrashTestSpecifications,andisapprovedbytheFHWAforuseonhighwayconstructionprojectswherethepostedvehiclespeedinaworkzonecanbeashighas62-mph/100kph.Theroadguardhighwayassemblyisafabricatedsteelassemblydesignedtoeasilymounttotheroadguardbarriers.ThisASSEMBLYprovidestwodistinctfunctions:Providingastrongandresilientoutersurfacetoresistthewheelandbumperofastrikingvehicle,andtolinkthebarriersmoresecurelytoeachotherandcreateaveryrobustlinearsystemsuchthatthe ofastrikingvehiclewillbedistributedovermanybarriers,minimizingthelalmovementatthepointofimpact.Theroadguardsecuritypanelisusedforperimetersecurity,safety,crowdcontrolandgeneralsiteprotection.These6’x4’chainlinkfencepanelunitsinstallfirmlyonaroadguardbarriertogiveastable8foothighcontinuous,unbrokenprotectivefenceforallsecurityandsafetyneeds.Optionalsolidmaterial,screen,orinterwovenchainlinkpanelsareavailable.OurstudyarealiesinthenorthofmoderndeltaoftheHuangheRiveranditwasformedbytheriverwayofDiaokouin1964-1976.TheHuangheRiverhasthelargestcontentofsiltandmaytransportabout10.6Gt/asiltintotheBohaisea.Thesub-deltawasbuiltquicklyunderthesupplyofabundantsediments.Therapidaccumulationinthedeltaalwaysmakestherivercoursetobedivertedfrequently.Theabandoneddeltawouldbeerodedandretreatedrapidlyafterdiversionbecausethelackofsupply.Thegradientofthecoastalslopeinthedeltaisverygentle,thewaterdepthisonly10mintheceabout10kmapartfromthecoastalbank.Afewofkilometers-widetidalflatwouldbeexposedduringebbtidethatmakesusworkonthetidalflatconveniently.Thesedimentsonthetidalflataremainlycomposedoffinesands,siltandclay.Withthedevelopmentofeconomicconstruction,variouskindsofmodernizedtrafficfacility,isitpaytosetupsuchasexpressway,city,overpassfunctionblownstrengthendaybydayincommunicationsandtransportation,thedevelopmentofandthecommunicationsandtransportationhascausedtherapidrisingofthetrafficaccident,trafficSafeandownthrough ingagreatworlddifficultproblemTherigidityguardrailisoffendedtheguardrailformnotbasicallyoutofshapebytheauto,generallypointtheconceptofadopting"safeappearance"ofguardrailofmodesinoperaticmusicofconcretewallofconcreteguardrail,throughthedifferentsidesofslopeofappearancemainly,maketheautomoderate,itishightoclimb,changedirection,lastmakingnotcollidingkindsofguardrailanglesmallerthan100carnotmedium-sizedmakingachangeeffectiveto,makeautoreceivelighterdamage,asangleofcolliding,collidewhenrelativelyheavyspeedhaving,theautodamagesseriously.Accordingtorigiditywithcandivideintoflexibleguardrail,semi-rigidguardrailandrigidityguardrailsafeformofguardrail.1)Theflexibleguardrailgenerallypointsthecableguardrail,isonekindwithstructurethatfixesofmanyrootsonthepillarofcableofexertingprestressing,totallyrelyingonthestressofdrawingofthecabletoresistthevehicleandcollide,theformisbeautiful,notoppressingthesensewhilegoing,butthesightleadsworse,thefabricationcostisrelativelyhigh,donotgenerallyuse.2)Thesemi-rigidguardrailgenerallypointstheroofbeamtypeguardrail,isakindofroofbeamtypestructurefixedwiththepillar,dependontheguardrailcrookedandoutofshapeandapulling resistthecollisionofthevehicle.TherearealotofkindsoftheroofbeamtypeguardrailusethemostextensiveonetobetheroofbeamguardrailofthewaveformHavecertainrigidityandtoughness,easytochangeafterdamaging,canleadthesighttheappearanceisbeautiful.3)Therigidityguardrailgenerallypointsthecementconcretewalltypeguardrail,isakindofconcretewalltypestructureofcementwithcertainsectionform,relyontheautotoclimbhigh,outofshapeandrubingtoabsorbtheenergyofcolliding。Theguardrailsecurityhigh,canpreventtwoaccidenteffectively,itselfdifficulttodamage,themaintenancecostislow,buthavesenseofoppressingtogotothevehicle,itisrelativelyserioustodamagethevehicle.Securityguardrailofexpresswayshouldpreventhigh-speedvehiclethatgofromexceedoutlet,passthroughcentralisitisitisittolane,canleadthedriver'ssightcorrectlytointrudeupontotaketoseparate,makethevehiclegetbacktonormaltraveldirection,anditisminimumtoreducemalignantdegreeoftheaccidentto.Inaword,high-speedhighwaysafetyguardrailreducetrafficaccidentandreduceaccidentmalignanteffectivemeasureofdegree,butinshouldn'tsetupceoftheguardrailsetuptheguardrail, ethenewbarrierinstead,itisdangeroustoincreasetheaccident.So,shouldgraspthecharacteristicoftheguardrailtothedesignofthesafeguardrailfirstandcombinethetrafficconditionoftheexpressway,onthepremiseofmeetingbasicfunctionoftheguardrail,selectthesuitableguardrailformforuse,adopttherationalestablishmentBecausetopographicalterms,maketheinvestmentandtechnologicaltermstorestrainfrommanykindsoffactor,waysidehavebarrierunavoidably,toexceedvehicleofoutletformthepotentialdanger.Waysideguardrailsetupinbeabletoreduceaccidentseriousceofdegreeonly,itsdesignprincipleisconfirmedaccordingtopeople'ssubjectivejudgementofsuchfactorsasclassofhighway,volumeoftraffic,vehiclemakingupandwaysidecharacteristicThemostidealguardrailformisthatmeetfunction'sneedsaswellasthecostisthelowest,andelegantinappearance,andcanleadthesightofdrivingavehicle.Thecableguardrailissuitablefornothavingevenlynosinking,snow,longstraightline,highwaysectionwiththespecialbeautifuldemand;Theconcreteguardrailissuitableforverydangerousstepsuchhighwaysectionsastheriverbridge,cliff,etc.;Waveformguardrailhaveheavysuitability,suitableforallhighwaysectionbasically,especiallysmallradiuscurveddishisitleadhighwaysectionofsighttoneed.RequireaccordingtonormandHunanProvincemanypiecesofhigh-speedhighwaysafetyguardraildesignexperience,thegeneralwaysideofhighwaysectionadoptstheroofbeamguardrailofthewaveform,thespecificverydifficultdangeroushighwaysectionadoptstheconcreteguardrail.Inasituationthatthevolumeoftrafficisbig,vehiclegoatahighspeed,isitcross separatethesituationledtohappen,mayproducetheseriousconsequence,so,thecentralseparatethewidththatbringastheimportantbasisofsettingupguardrail.Anticollisioncushionthroughabsorbvehiclecollideenergymakevehicle'sstopsafely,makethevehiclechangetraveldirection,avoidthedepartmentandtakeadvantageof nel'sreceivingfacilitiesoftheseriousinjury.Theanticollisioncushioniswithlowcosts,haveveryhighsecurityperformance.Itmainlyappliesfromtakinginthemiddleofnothavingtobringingandcarryingoutthetransitionwhilehaving,theusualfriendshipchannelizingislandshuntsone,hasregularbarrierswhenthepilosityhighwaysectionofthetrafficaccident.Theanticollisioncushionhassticcushionsofsystematicanticollisionofintermediatelayer,filloutsuchvariousformsasthesandsticbarrelanticollisioncushion,sandbag,etc..Practicehasproved,theanticollisioncushionisakindofeffectivefacility,itismainlyseriousdegreewhichreducestheaccident,butnotreducetheemergenceoftheaccident.Withtherapiddevelopmentoftheexpresswayofourcountry,peoplehaveimprovedalotunderstandingoftheimportanceofsafeguardrail,whilebuildingtheguardrail,shouldcomparefromsuchmanyaspectsasperformance,viewandeconomy,etc.conscientiously,considerinanall-roundway.Theanticollisionguardrailincludestheconcretefunctionsoffourrespects:1)Preventvehiclefromjumpoutlet(bridge)outside,isitbringtoseparatetocentralbutspeech,isitpreventvehiclefrompassthroughcentralisittakebutintrudeuponcorrectlythelanetoseparatetowant;Meanwhile,isitgetoffvehiclegetoutunderpartialtoingthebreastboard,orbreaktheguardrailtodefend;2)Theguardrailshouldbeabletomakethevehiclereplytoandstoptraveldirectionfrequently;3)Whilecolliding,thedamagetothepassengeristheminimumdegree:4)Canleadthesightofthe whodrive.Canbefoundoutfromabove-mentionedfunctions,theguardrailmusthavesuitableintensityofmechanicsandcollisioninordertokeepoutthevehicleofrigidity,preventthevehiclefromcrossingoutsideofoutlet(thebridge):Meanwhile,rigidityofguardrailcantooheavy,canisitinjureorlightenthedegreeofinjuringtoprotectpassengerfrombetter.Realcarfullsizeisitisitoffendwithactualautoguardrailisitimitateakindofresearchapproachoftrafficaccidenttocometotesttobumpinto.Itcangetautosportorbitandsportpostureinthecourseofstriking,suchtruebelievabletechnicalparametersasthenumbervalueofshockpower,etc.ofdeformationanddamagecharacteristicandcollidingoftheautoandguardrail,thusofferedthescientificbasisforthedependabilityofotherresearchapproach eresultsofdesignandverificationofthesafeandreliableguardrailstructure.Now,variouscountriesbumpintothetestoftherealcarofthesystemtoregardasthebasicprerequisitestudiedtotheguardrail.Becausethewaysideguardrailitselfisabarrier,inasituationthattheconditionispermitted,thesideguardrailofthewayshouldbesetupasmuchaspossibleandfarawayfromtherunway.So,thevehiclewhichdeviatesfromtherunwaycanperhapsisitanswertosailintherunwayagainhavingnoaccidentsmostheavy.Waysideobjectexceedfromrunwayedgesuretoafterworthing,takeasthebarrier,drivercanbecausereducingspeedlastposition.Thisdistanceiscalledandleanttowardsthelocationhorizontally.Thisdistancevarieswithspeed,mustpayattentiontoguaranteeingthepropertransitionisdesignedwhenNo.linkwithotherstructuresthinginsideguardrails;Shouldalsopayattentiontoguaranteeingtheproperdistancebetweentheguardrailandbarrier.Thedeformationwhentheguardrailcollidesisnotonlyanimportantfactorthattheformischosen,butalsoanimportantfactorsetup.Whenthebarrierespeciallyprotectedisarigidityobject,thedistancebetweentheguardrailandobjectshouldbelargeinordertopreventthevehiclefromstumblinghinderingontherigidityobjectenough.Setupthesideguardrailofthewaytoguaranteeingthefunctiononthewaywithsafesideisgreatrationally,butthediversificationofthesideguardrailformofthewayandinfluencefactorofestablishmentmakethedesignofthesideguardrailofthewayverycomplicatedGuardrailassuperhighwayaimportantonesafetydevicesmostoneof,canpreventvehiclefromgoouthighwayorintrudeupontotogothelane,havefunctionofreducingaccidentlosses,guaranteeingthetrafficsafety,forimprovingsenseofsafetyandcomfortablenessthatthedepartmentrides nel,itisindispensabletoimprovetheeconomyofhighwaytransportationandsocialbenefit.Theguardrailisoneofthemostimportantsafetydevicesofexpressway.Accordingtothedifferencewhichcansucktheway,theguardrailisdividedintothefollowing3typicalforms:Rigidityguardrail,thesemi-rigidguardrailandflexibleguardrail.Thefunctionoftheguardrailis:Whentheautoandguardrailcollide,underone'sownsituationnotdestroyed,absorbtheenergyofcollidingpartly,andchanneltheautointotherunway,guaranteetheautodoesnotcrosstheguardrailandrushesintotherelativelaneorputsthebankprotectionrollingly.Sotherequisitionforguardrailis:Musthaveenoughintensityandproperrigidity,thereshouldthestrongeronethatcansuckthecharacteristicandcertaindirectionabilityatthesametime.Obviously,itisdifferentthatsystematicsecuritywithcollidingto"theauto-thesemi-rigidguardrail"ofstudyon"securitythattheautocollides"isstudied,in"autocollidesecurity"researchresultsthatmakecanisitguidesemi-rigiddesignofguardrailtousefordirectlyeitherinstudying";Orregardtheautoasandhavenoformofgeometryandtheparticleofthesizeorsimplespring-quality-damsystem,isitisitstudysemi-rigidguardrailforlineelastomersemi-rigiddesigningtechniqueofguardrailwaitforsuchasanticollisionmechanismtocometosimplifyatthesametime.Havenotalreadywhilestudyingconsideredtheballsticityofthesemi-rigidguardrailmovesontheinfluenceofthelawtotheautobigandoutofshape,considergeometryform,sizeandautocarbodystructureofautoysticitytobeheavyandoutofshapetosemi-rigidguardrailheavyinfluenceoutofshapetoo,havenotconsideredtheemergencyrateeffectofthematerialandinertiaeffectaretotheautocarbodystructureandlargeinfluenceoutofshapeofsemi-rigidguardrail,havenotconsideredtheinfluenceofeachandone'sowntheautoandsemi-rigidguardrailandcontactandfrictioneachotherevenmore.Inaword,havenotconsideredanycouplingdynamicsphenomenon.Obviously,theessencethatthedesigningtechniqueofsemi-rigidguardrailreceivedlikethiscannotreflectthequestion,resultitsunfavorabletospecial,greatmalignanttrafficaccidentpreventandcureimprovementofWethink,twoinalienablecomponentsinthesystemthattheautoandsemi-rigidguardrailcollideintheautobumpsintothisofsemi-rigidguardrail,themutualcouplingoftwo,influencingeachother,formanorganicwholetogether.Whiletheautobumpsintothesemi-rigidguardrail,theautowillkeepintouchwiththesemi-rigidguardrails,andpositionandareaofcontactthatareexposedtowillchangewithsportoftheauto,thecontactareachangedwillproducethecontactstrengthandfrictionalchangedchanged,underactingoncommonlyincontactstrengthandfrictionalchangedofchanging,semi-rigidguardrailandautocarbodystructurewilltakecesizeandwhompositionchangeheavyandoutofshape(thiskindisbigandoutofshapeandoftencloselyrelatedtotheemergencyrateeffectofthematerialandinertiaeffect),Thiskindheavytocancausenewcontactwhilebeingoutofshape(includingautocarbodystructureandsemi-rigidguardrailareone'sownsincecontact,positionandareaareinchangingcontacteachother),theninfluencethesizeanddirectionexposedtostrengthandfrictional influencethesportorbitoftheauto,thiskindfeedbackfunctionmake"auto-semi-rigidguardrail"collidesystemstrikeshapeatspecificcouplingeachNow,peoplecollidestructurebasicprincipleofdynamicsapplyotherrelevantfield,includingthestudyonsemi-rigidguardrail,buttherestrictionthatdividedbecauseofthespeciality,indesigntechnicalresearchofthesemi-rigidguardrail,havenotmadebreakthroughprogressyet.Throughtheresponsecharacteristicysisofthehumanbodyinthecarinthecoursetocolliding,isitcollidecoursevariouskindsofsportlawthatautomightappearhumanbodybludgontheinfluencelawrespondedintotocartofindout,confirminviewoftheabovethatitismostfavorabletohumanbody'ssafeautoidealsportlawinthecarinthecoursetocollide.Thisresearchandpastresearcharedifferent.Collisionsecurityofautostudyforalargenumberofresearchresults,authorgoonalargenumberofautocollidesecuritystudytoointhepast,buttheonethatstudyisallthattheautostipulatingbumpsintothiskindofspecialoperatingmodeofrigiditywallinsafetystandardsofautos,purposethatstudytojudgemechanics,autoofstructurecharacteristicsuitableandhowimprovetheautostructuraldesign,theautosetupcollidesthoughthemodelisverycomplicated,butthatservesforthemechanicscharacteristicofconfirmingtheautostructure,itisunnecessarytootoconsidertarget'simpactonstructuralmechanicscharacteristicoftheautostruck.Andthestudyonanticollisionmechanismofsemi-rigidguardrail,isitconsidermechanicscharacteristic,autoofstructuretowanttoo(whetherformerresearchautothatsetupcollidemodelcanforisitservetostudyoriginallyafterdealingwith),butthemoreimportantthingisthatwillconsidertheinfluenceoncourseofcollidingofmechanicscharacteristicofthesemi-rigidguardrail,andvariouskindsofcouplingphenomenasetupthroughcontactinginterfacesbetweentheautoandsemi-rigidguardrail,obviously,suchresearchandresearchinthepastwereThesetting-upofthesystemintactcouplingdynamicsbigsystemmodelisthemostkeyquestionthat"theauto-thesemi-rigidguardrail"collides.Shouldconsiderthesemi-rigidguardrailandone'sowngreatphenomenaoutofshapeofballsticityofautointhemodel,andalsoconsiderthesemi-rigidguardrailandautoone'sowngeometryformandsize,considersuchcomplicatedfactorsasthecontactandfrictionbetweentheautoandguardrail,etc.,itismoresuitabletoadoptthefiniteelementmodel.Forisitcalculateprecisionandcomputationalefficiencytwodemandofrespecttogiveconsiderationto,toisitisitisitadoptexplicitintegrationformtontosolvetoaskmodel,allunitsadoptsometotalmarkandleadingparametersandandleakthecontroltechnology,inordertoimprovethecomputationalspeed.Inordertomakethebigsystemmodelsetupcanbeusedintheresearchofvariouskindsofstructureformsofsemi-rigidguardrailanddesignparametersandlawgivingconsiderationtothemodelmoreconveniently,ntosetupanautoincommonuseandsimplifymodels,andsetuptheguardrailmodelstorehousemadeupofseveralmodelandcharacteristicofsemi-rigidguardrailaccordingtotheneed.Toautobeingstructurecomplicatedandaexistingoneusedinautocollideautothatsecuritystudycalculatemodeltoohugecharacteristic,isitisitatthefoundation,securityofresearchresults,collidetoautosecuritycommonlyusedautocollidemodelsimplifyrationallyinstudyingtocollideinexistingautoton,setupconcise,ocular,swift,scientificautoandsimplifymodels.Simplifyingmodelscanadoptthemodelofmixingthatnodalsunitandnodalentity'suniteightfourform,usesunitsimulationofthepartthatmaybecontactedwiththesemi-rigidguardrailontheauto,otherpartsadoptentity'sunitsimulation.Use"auto-semi-rigidguardrail"collidesystemintactcouplingdynamicsmodel,carryonsensitivity,structureofdesignparameteryse,studysemi-rigidguardrailstructureformtocollideautoactualsportinfluencelawoflawinthecourseatfirst,autolawanditsthemostunanimousoptimumstructureformofidealsportlawofrealsportbyfixingmaking.Thentooptimumstructureform,isituse"auto-semi-rigidguardrail"collidesystemintactcouplingdynamicsmodeltocontinue,studythelawofimpactonrealsportlawoftheautoofdesignparameterofthestructure,inordertoconfirmtheoptimumdesignparameter.Theexperimentalnumberoftimesthatreducibletocollide,obtainedtheconsiderabledirecteconomicbenefits.Foralongtime,tosemi-rigiddesignofguardrail,adoptexperiencedesignmethod,halfyzetechnologyandtestmethodisitgoontomixall,thoughcandesignthefeasibleguardrail,costlyandtime-consumingonlyaccordingtotestingandtryingying,veryunremunerative,anddifficulttomakethesecuritylevelofthesemi-rigidguardrailinoptimumstate.Ifthereissemi-rigidguardrailthatdesignsthenewtechnologyanddoesguidance,candispelthepotentialsafetyhazardduringthecourseofdesigning,reduceandcollidetheexperimentalnumberoftimes,reduceoncethetestofcolliding,caneconomize100,000-200,000yuan.Inaddition,canoptimizethestructureofguardrailintheforminganddesignparameter,hassolvedtheproblemthatthetraditionalmethodisdifficulttosolve.Thenewmechanismoftheanticollisionofsemi-rigidguardrailisusedinthedesignandimprovementofthesemi-rigidguardrailontheexpresswayandspecial-purposeClassIHighwayofautomainly,certainly,canapplytothedesignandimprovementofthesemi-rigidguardrailonotherhighwaysatalllevelstoo.However,impactkineticenergyanditstravelspeedthattheautohasarethesquareofindirectradio,oncethehigh-speedautothatgoescrossesthetrafficaccidentoutsidetheoutlet(theproportionoftakingthetotalamountoftrafficaccidentsofthiskindofaccidentisabout45%,about30%ontheexpresswayontheordinaryarterialhighway),theconsequencewillbemoreserious.Atthismoment,designthefurnishingthattheunreasonableguardrailwill ethedanger,andtheninfluencetheeffectiveuseoftheexpresswayandsuperhighwayseriously,can'tgivefullytothehigh-speedadvantagethattransportsafely.Practiceindicates,thesemi-rigidguardrailisakindofguardrailformwithverygoodperformance,alreadyusedwidelyworldwide,becausenewmechanismsemi-rigidtoprotectdesignoffencenewtechnologycanmakesemi-rigidhigh-speedcollisionsafeperformanceofguardrailimprovefurtheronthebasisofsemi-rigidguardrailanticollision,exceedtovehicleoutletpreventionandcureofthetrafficaccident(accidentthiskindofthemainreasonthatcausespecial,greatmalignanttrafficaccident)haveimportantmeanings,thereforehavewideapplicationprospects.Studyonnewmechanismoftheanticollisionofsemi-rigidguardrailtoguaranteehighwaycommunicationtransportationsystemrealizeatahighspeedtransportingbasicresearchofpurposeoneofsafely,itisasubjectforresearchofcrossinginfieldsmulti-disciplinarily,thevalueofacademicresearchwithimportanceandprospectofusing.Itbreakthroughprofessionalrestrictionthatdivideinthepast,collidethesystemasabigsystemofcoupling"auto-semi-rigidguardrail",proceedfromtheangleofguaranteeingthesafelevelisoptimumthatthepassengercollidesinthecar,studyandcollidetheidealsportlawwhichtheautoshouldpossessinthecourse,Onthisbasis,throughsetup"auto-semi-rigidguardrail"collidesystematiccouplingdynamicsartificialmodelisitstudyguardrailanticollisionnewmechanismtocome,improvethepreconditionofdesigningcompetenceofsemi-rigidguardrailtothegreatbreak-throughofthedesigningtechniqueoftraditionalguardrail,haveimportantmeaningstothepreventionandcureofthespecial,greatmalignantaccidentinthetrafficaccidentoftheroad,so,shouldlaunchthestudyonit,theimprovementofcompetenceinordertoguaranteeroadtraffic'ssecurity,mouldingindustry'snewimageofcommunicationsandtransportationtoestablishthetechnologicalfoundationinamorecost-effectivemanner.Therigidityguardrailsandsemi-rigidguardrailsaretheimportantsafetydevicesontheexpressway.Studieshaveshownrigidityguardrailthoughoutofshapebasicallyincollidinginaccident,butbecauseone'sownstructurerigidityisgreat,notonlytheabilitytoabsorbenergyislow,butalsoapttocausetwoaccidents.Thesemi-rigidguardrailisakindofcontinuousroofbeamposttypeguardrailstructure,becausetherearecertainrigidityandflexibility,havecertainenergyabsorbability,butlightentheinjurytothepassengerandvehiclegreatly,soalreadywidelyappliedtothehighwayengineering.Theroofbeamguardrailofthewaveformisamainformofthesemi-rigidguardrail,carryonresearchofperformanceandenergyabsorbabilityofsafeprotectiontoit,willyainstructingroletotheconstructionoftheexpresswayofmountainarea,willofferthetheoreticalfoundationforsomedesignsofcompositeguardrail.Improvetheenvironmentalqualityoftheundergroundspaceandventilationresult,offerthecomfortableenvironmentofgoingbybustopassenger,offerthegoodconditionofworktostationequipmentandstaffmember,maketheundergroundenvironmentgeteffectivecontrol.Satisfiedwhenthefireaccidenthappensinthestationortheannex,arrangecigarettesandventilateeffectively,guaranteepassenger'sevacuatingsafelyandstaffmembersande