科技英语论文..docx

科技英语论文..docx

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Title:

ResearchReportonDemolitionofUrbanViaduct

Thesis:

Viaductplaysanimportantroleinmitigatingtrafficcongestion.Butaspartoftheurbanroadthree-dimensionalcrosssystem,itisclearthattheviaductcannotplaythefullrole.China'surbanviaductintheconstructionboom,itisnecessarytoreflectonthecityviaductconstruction"overheating"onthecity'straffic,economicandenvironmentalaspectsofthenegativeimpact.

Formaloutline:

Ⅰ.Reconstructiontechnologyofurbanviaduct

A.Negativeeffectsofurbanviaducts

B.Commontechnologyofdemolitionandreconstructionofviaduct

1.BriefIntroductionofCommonMethodsforDemolitionofUrbanViaduct

2.ContrastiveAnalysisofCommonlyUsedDemolitionTechnology

".ATypicalCaseAnalysisofDemolitionofUrbanViaduct

A.Demolitionofthefailureofthecaseanalysis

B.Demonstrationofsuccessfuldemolition1.ReconstructionofDemolitionofBostonViaduct

2.CaseStudyonDemolitionofViaductBridgeinQingxiRiver,Korea

Ⅲ.Outlookandrecommendations

A.Coordinationofurbanenvironment,economicbenefits,carefullybuiltviaduct

B.Dothecorrespondingemergencypreventionplan

Abstract

China'surbanviaductintheconstructionboom,itisnecessarytoreflectonthecityviaductconstruction"overheating"onthecity'straffic,economicandenvironmentalaspectsofthenegativeimpact.Thispaperanalyzesthenegativeimpactofbuildingviaductsathomeandabroad,andrevealsthenecessityofdemolitionofviaducts.Thispaperintroducesthetechnicalmeansandthemethodofriskpreventionandcontrol.Andfromthepositiveandnegativeaspectsoftheprojectcase,thedemolitionoftheviaductdemolitionprocessproblemsandengineeringexperiencetosummarize,hopethatthroughscientificplanningtoleadtheviaductunderthenegativeuseofnegativespacetoincreaseenvironmentalprotectionmeasurestoencourageandactivelyguidethepublicparticipationAndothermeanstoactivelyrespondtothenegativeimpactofurbanviaduct.

Keywords:

urbanviaduct;negativeimpact;challenge;dismantling;suggestion

ProfessorDongYanling

TheworkofMike

Architecturalandcivilengineeringclass3of201625May2017

ResearchReportonDemolitionofUrbanViaduct

Introduction

Urbanroadtrafficsysteminthecaseofroughlydetermined,thecity'slandresourcesareextremelylimited,thecityviaductinthecity'sexistingplanningpatterncanbemoreeffectiveuseofurbanspace.Butasapartoftheurbanroadthree-dimensionalcrosssystem,obviouslyviaductandCannotplaythefullrole.Andinmostofourcitieshavebuiltviaductsdidnotfundamentallyimprovethetrafficconditions,acompleteurbantransportsystemnotonlyrelyononeortwoviaductscanberesolved,andsomeviaductsonlybeneficialtothecar,butcausedthepedestrianandpublicTrafficinconvenience,whichisclearlywiththeimprovementoftheoriginalsituationoftrafficintheoppositedirection,wecansee,viaductexpensive,ifnottheformationofeffectivecapacityandservicelevel,willresultinveryscientificandreasonable,veryeconomical

I.Theunderstandingofthesharingeconomyandthesharedspace

A.Negativeeffectsofurbanviaducts

Theenvironmentalimpactofurbanviaductsismainlymanifestedinnoise,dust,tailgas,lighting,vibrationandsoon.

（1）noisepollution.Viaductishigherthantheground,thetrafficnoisehasalargeintensity,awiderangeofeffects,dayandnightchangesarenotobvious,thenightisveryseriouscharacteristics,especiallyontheviaductabovethegreaterimpactonthefloor.

（2）affectthebridgeunderthelighting.SomescholarshavecarriedoutrelevantexperimentalresearchontheilluminationoftheviaductinShanghai.Manyplacesunderthebridgedonotmeetthedemandforshadeplants,andiftheviaductistooclosetothetwosides,itwillaffectthelightingofthelow-levelhouseholds.（3）accumulationofdust,wastegas.Therearealotofheavymetals（suchasPb）accumulatedinthedustofthecitystreets,whicharepotentiallyharmfultohumanhealth,especiallychildren.Theviaductsofthecityareoftenpollutedandpurifiedbythestreetcanyoneffect.Theviaducthasbecomeatypicalnarrowbeltinthecity.

B.Commontechnologyofdemolitionandreconstructionofviaduct

1.BriefIntroductionofCommonMethodsforDemolitionofUrbanViaduct

1controlblastingremovalmethod.Controlblastingdemolition,thatis,throughreasonabledesignandcarefulconstruction,andstrictlycontroltheblastingenergyandnorms,sothatthesoundofblasting,flyingstone,vibration,shockwave,damageareaandthebulkofthebulkrangeanddirection,controlwithinaspecifiedlimitSpeciesremovalmethod.

2staticblastingremovalmethod

Staticblastingdemolitionanddemolitionmethod,thatis,acontainingaluminum,magnesium,calcium,iron,oxygen,silicon,phosphorus,titaniumandotherelementsofinorganicsaltpowderbrokenbrokenwater,resultinginahugeexpansionpressure（upto30~50MPa）,Theconcreteorrockburst,broken.

3cuttingandremovingmethod

Cuttingandremovalmethod,themainuseoflarge-scalecuttingmachineryinaccordancewiththeoppositeprocessofbridgeconstructionofthebridgesectionbysection,thecuttingofthebeamundertheuseofliftingmachineryshippedaway.Commonlyusedviaductremovalmethodmainlymechanicalsawcuttingmethod,highpressurewaterjetcuttingandremovalmethodandenergycuttingcuttingmethod.The

4mechanicalremovalmethod

Mechanicalremovalmethodistheuseofspecialorgeneralmachineryandequipmentbythereplacementoftheworkingdevicedirectlytothebridgebridgebrokenanddisintegrated,forthebridgedeckpavementandotherpartsofthemainuseofartificialmachineryorsimplemachinery2.MobileInternetmodel

2.ContrastiveAnalysisofCommonlyUsedDemolitionTechnology

Mechanicallaw:

thesecurityriskisrelativelylow,aslongasthetechnicalmeasuresclosely,managementinplace,canguaranteesecurity;andtheriskisaone-time,aslongasthebridgecollapsedsmoothly,theriskislifted.Cuttingandmechanicalmethod:

thelong-termuseoffull-courtstent,stentstabilityofthelong-termsecurityrisks;alargenumberofconcreteblockliftingprocessthereisasecurityrisk.Puremechanicalremovalmethod:

thesecurityriskisrelativelyhigh,duetothestructuralcharacteristicsofthebridge,whentheloadislikelytocauserepeatedimpactoftheinstabilityofthestructure,collapsed

II.ATypicalCaseAnalysisofDemolitionofUrbanViaduct

A.Demolitionofthefailureofthecaseanalysis

Eventplayback:

July2,201213:

30orso,aloudnoisetohappinessSouthRoad,DeshengEastRoadneartheintersectionofresidentswereshocked,livinginthefirstflooroftheresidentscanevenfeeltheobviousshock.InDeshengRoad,asectionofthedemolitionoftheviaductcollapsed,killingonepersondied,threepeoplewereinjured.Analysisofthecauseoftheaccident:

ChinaRailwayTwenty-fourBureauofZhejiangEngineeringCo.,Ltd.LiangShuifeng,deputymanageroftheproject,said:

"Theconstructionprogramafterexpertdemonstration,theoperationprocessisstrictlyinaccordancewiththeexpertdemonstrationprogramimplementation,takingintoaccountthespecialnatureofliftingwork,Largercompany-HangzhouHerculesLiftingTransportationCo.,Ltd.subcontractingoperation,atthesametimeintheconstructionprocessandcommissionedathirdpartytestingunittomonitortheentireprocessbeforetheincidentmonitoringdata,includingtheentiresituationofthestentarenormal,Anaccidentisaccidental."

B.Demonstrationofsuccessfuldemolition1.ReconstructionofDemolitionofBostonViaduct

Serioustrafficcongestionpromptedthelocalgovernmenttotakethedemolitionoftheviaduct,anditsburiedintheundergroundgrand"bigdig"（bigdig）action.1971plan,upto20yearsofpublicparticipationandrepeatedgovernmentarguments,until1991begantostart.December31,2007completed,16yearstospendmorethan150billionUSdollars,becomingthehistoryofthehuge"marathonproject".

Afterthedemolitionoftheviaduct,thegroundroadintheestablishmentofalargeCentralGreenwayPark,peoplehereleisurewalk,play,sun,Bostonhasrestoredthepastquietandpleasant.Asaresultofmorebeautifulpublicexchangespace,bothsidesofthebusinesshasalsoregainedvitality

2.CaseStudyonDemolitionofViaductBridgeinQingxiRiver,Korea

CheonggyecheonisanancientcityriverflowingthroughthecitycenterofSeoul.Itoftenorganizes

variousfolkculturalactivitiesalongthecoast.DuringtheKoreanWar,alargenumberofshantytownsaroundCheonggyecheonmadeitasymbolofrubbish,sewageandslums.Inthe1950s,theSouthKoreaneconomystarted,limitedtothelackoffunds,thedeteriorationoftheenvironmentandthedifficultiesofgovernance.In1958,theKoreangovernmentcoveredtheCheonggyecheoncementboardroadandbuiltalong5650mwideand16mviaductin1971TheThiselevatedroadandtherapidriseoftheroadonbothsidesofthebuildinghasbecomeasymboloftherapiddevelopmentofSouthKorea'seconomy.Viaductdestroyedthebeautyofthecitycenter,pollutedtheenvironment,butalsotothepubliconbothsidesoftheviaductshopsandshopsdiscouraged,resultinginadepressionintheregion.TheCheonggyecheonRenaissancerenovationprojectlastedtwoandahalfyears,dismantlingtheviaductcoveredwithit,andbuiltacleanstreamofcleanwaterandecologicalrecreationalspace,withacostofabout$360million.CompletedinOctober2005,theprojectattheVeniceInternationalArchitectureBie