土木工程概论.docx

土木工程概论.docx

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土木工程概论

Civilengineeringintroductionpapers

Abstract:

thecivilengineeringisahugediscipline,butthemainoneisbuilding,buildingwhetherinChinaorabroad,hasalonghistory,long-termdevelopmentprocess.Theworldischangingeveryday,butthebuildingalsoalongwiththeprogressofscienceanddevelopment.Mechanicsfindings,materialofupdate,evermorescientifictechnologyintothebuilding.Butbeforearoomwithatiletocoverthetopofthehouse,nowforcomfort,differentideas,differentscientific,promotedthedevelopmentofcivilengineering,makingitmoreperfect.

[keywords]:

civilengineering;Architecture;Mechanics,Materials.

Civilengineeringisbuildvariousprojectscollectively.Itwasmeanttobeand"militaryproject"corresponding.InEnglishthehistoryofCivilEngineering,mechanicalEngineering,electricalEngineering,chemicalEngineeringbelongtotoEngineering,becausetheyallhaveMinYongXing.Later,astheprojectdevelopmentofscienceandtechnology,mechanical,electrical,chemicalhasgraduallyformedindependentscientific,toEngineeringbecameCivilEngineeringofspecializednouns.Sofar,inEnglish,toEngineeringincludewaterconservancyproject,portEngineering,Whileinourcountry,waterconservancyprojectsandportprojectsalsobecomeverycloseandcivilengineeringrelativelyindependentbranch.Civilengineeringconstructionofobject,bothreferstothatbuiltontheground,undergroundwaterengineeringfacilities,alsoreferstoappliedmaterialsequipmentandconductoftheinvestigation,designandconstruction,maintenance,repairandotherprofessionaltechnology.

Civilengineeringisakindofwithpeople'sfood,clothing,shelterandtransportationhascloserelationoftheproject.Amongthemwith"live"relationshipisdirectly.Because,tosolvethe"live"problemmustbuildvarioustypesofbuildings.Tosolvethe"line,foodandclothes"problembothdirectside,butalsoaindirectside."Line",mustbuildrailways,roads,Bridges,"Feed",mustbewelldrillingwater,waterconservancy,farmirrigation,drainagewatersupplyforthecity,thatisdirectrelation.Indirectlyrelationshipisnomatterwhatyoudo,manufacturingcars,ships,orspinningandweaving,clothing,orevenproductionsteel,launchsatellites,conductingscientificresearchactivitiesareinseparablefrombuildvariousbuildings,structuresandbuildallkindsofprojectfacilities.

Civilengineeringwiththeprogressofhumansocietyanddevelopment,yethasevolvedintolarge-scalecomprehensivediscipline,ithasoutmanybranch,suchas:

architecturalengineering,therailwayengineering,roadengineering,bridgeengineering,specialengineeringstructure,waterandwastewaterengineering,portengineering,hydraulicengineering,environmentengineeringdisciplines.

Civilengineeringasanimportantbasicdisciplines,andhasitsimportantattributesof:

integrated,sociality,practicality,unity.Civilengineeringforthedevelopmentofnationaleconomyandtheimprovementofpeople'slifeprovidesanimportantmaterialandtechnicalbasis,formanyindustrialinvigorationplayedaroleinpromoting,engineeringconstructionistheformationofafixedassetbasicproductionprocess,therefore,constructionandrealestatebecomeinmanycountriesandregions,economicpowerhouses.

Constructionprojectishousingplanning,survey,design,constructionofthefloorboard.Purposeisforhumanlifeandproductionprovideplaces.

Houseswillbelikeaman,it'slikeaman'slifeplanningenvironmentisresponsiblebytheplanners,Itslayoutandartisticprocessing,correspondingtothebodyshapelooksandtemperament,isresponsiblebythearchitect,Itsstructureislikeaperson'sbonesandlifeexpectancy,thestructuralengineerisresponsible,Itswater,heatingventilationandelectricalfacilitiessuchasthehumanorganandthenerve,isbytheequipmentengineerisresponsiblefor.Alsolikenatureintactshapedlikepeople,inthecityIdistrictplanningbasedonbuildhouses,andistheconstructionunit,reconnaissanceunit,designunitofvariousdesignengineersandconstructionunitscomprehensivecoordinationandcooperationprocess.

Afterall,butisstructuralstressbodyreactionforceandtheinternalstressandhowexternalforcebalance.Buildingtotackle,alsomustsolvetheproblemismechanicalproblems.Wehavetosolvetheproblemofdisciplinecalledarchitecturalmechanics.Architecturalmechanicshavecanbedividedinto:

statics,materialmechanicsandstructuralmechanicsthreemechanicalsystem.Architecturalmechanicsisdiscussionandresearchbuildingstructureandcomponentinloadandotherfactorsaffectingtheworkingconditionof,alsoisthebuildingofintensity,stiffnessandstability.Inload,bearloadandloadofstructureandcomponentcancausethesurroundingobjectsintheirfunction,andtheobjectitselfbytheloadeffectanddeformation,andthereisthepossibilityofdamage,butthestructureitselfhascertainresistancetodeformationanddestructionofcompetence,andthebearingcapacityofthestructuresizeisandcomponentofmaterials,crosssection,andthestructuralpropertiesofgeometrysize,workingconditionsandstructurecircumstancerelevant.Whiletheserelationshipscanbeimprovedbymechanicsformulasolvedthroughcalculation.

Becauseearthmovingmethodsandcostschangemorequicklythanthoseinanyotherbranchofcivilengineering,thisisafieldwheretherearerealopportunitiesfortheenthusiast.In1935mostofthemethodsnowinuseforcarryingandexcavatingearthwithrubber-tyredequipmentdidnotexist.Mostearthwasmovedbynarrowrailtrack,nowrelativelyrare,andthemainmethodsofexcavation,withfaceshovel,backacter,ordraglineorgrab,thoughtheyarestillwidelyusedareonlyafewofthemanycurrentmethods.Tokeephisknowledgeofearthmovingequipmentuptodateanengineermustthereforespendtinestudyingmodernmachines.Generallytheonlyreliableup-to-dateinformationonexcavators,loadersandtransportisobtainablefromthemakers.

Earthworksorearthmovingmeanscuttingintogroundwhereitssurfaceistoohigh（cuts）,anddumpingtheearthinotherplaceswherethesurfaceistoolow（fills）.Toreduceearthworkcosts,thevolumeofthefillsshouldbeequaltothevolumeofthecutsandwhereverpossiblethecutsshouldbeplacedneartofillsofequalvolumesoastoreducetransportanddoublehandlingofthefill.Thisworkofearthworkdesignfallsontheengineerwholaysouttheroadsinceitisthelayoutoftheearthworkmorethananythingelsewhichdecidesitscheapness.Fromtheavailablemapsahdlevels,theengineeringmusttrytoreachasmanydecisionsaspossibleinthedrawingofficebydrawingcrosssectionsoftheearthwork.Onthesitewhenfurtherinformationbecomesavailablehecanmakechangesinjissectionsandlayout,butthedrawinglfficeworkwillnothavebeenlost.Itwillhavehelpedhimtoreachthebestsolutionintheshortesttime.

Thecheapestwayofmovingearthistotakeitdirectlyoutofthecutanddropitasfillwiththesamemachine.Thisisnotalwayspossible,butwhenitcanbedoneitisideal,beingbothquickandcheap.Draglines,bulldozersandfaceshovelsandothis.Thelargestradiusisobtainedwiththedragline,andthelargesttonnageofearthismovedbythebulldozer,thoughonlyovershortdistances.Thedisadvantagesofthedraglinearethatitmustdigbelowitself,itcannotdigwithforceintocompactedmaterial,itcannotdigonsteepslopws,anditsdumpinganddiggingarenotaccurate.

Faceshovelsarebetweenbulldozersanddraglines,havingalargerradiusofactionthanbulldozersbutlessthandraglines.Theyareanletodigintoaverticalclifffaceinawaywhichwouldbedangeroustorabulldozeroperatorandimpossibleforadragline.Eachpieceofequipmentshouldbeleveloftheirtracksandfordeepdigsincompactmaterialabackacterismostuseful,butitsdumpingradiusisconsiderablylessthanthatofthesameescavatorfittedwithafaceshovel.

Rubber-tyredbowlscrapersareindispensableforfairlyleveldiggingwherethedistanceoftransportistoomuchtoradraglineorfaceshovel.Theycandigthematerialdeeply（butonlybelowthemselves）toafairlyflatsurface,carryithundredsofmetersifneedbe,thendropitandlevelitroughlyduringthedumping.Forharddiggingitisoftenfoundeconomicaltokeepapushertractor（wheeledortracked）onthediggingsite,topusheachscraperasitreturnstodig.Assoonasthescraperisfull,thepushertractorreturnstothebeginningofthedigtoheoptohelpthenestscraper.

Bowlscrapersareoftenextremelypowerfulmachines;manymakersbuildscrapersof8cubicmetersstruckcapacity,whichcarry10m³heaped.Thelargestself-propelledscrapersareof19m³struckcapacity（25m³heaped）andtheyaredrivenbyatractorengineof430horse-powers.

Dumpersareprobablythecommonestrubber-tyredtransportsincetheycanalsoconvenientlybeusedforcarryingconcreteorotherbuildingmaterials.Dumpershavetheearthcontaineroverthefrontaxleonlargerubber-tyredwheels,andthecontainertipsforwardsonmosttypes,thoughinarticulateddumpersthedirectionoftipcanbewidelyvaried.Thesmallestveacapacityofabout0.5m³,andthelargeststandardtypesareofabout4.5m³.Specialtypesincludetheself-loadingdumperofupto4m³andthearticulatedtypeofabout0.5m³.Thedistinctionbetweendumpersanddumptrucksmustberemembered.dumperstipforwardsandthedriversitsbehindtheload.Dumptrucksareheavy,strengthenedtippinglorries,thedrivertravelsinfrontlftheloadandtheloadisdumpedbehindh