E:Inthisproject10,000tofsteelstructurewillbefabricatedanderected.Itisaveryimportantpartoftheworks.Wemustpayenoughattentiontoit.Nowletsgoandhaveacloselookatthefabricationofthesteelstructurestepbystep.C:Thatisgood.Thisisthesteelstructuremillweintendtofabric...[继续阅读]

    Thestrongestathletescanliftcloseto455kgjustofftheground,butfewordinarypeoplecanliftmorethanabout68kg.Earlymansoondevelopedmachinesforliftinglargestonesandtreetrunks.Asimpledeviceisasinglepulleywheelarrangedasahoist.Butaropearoundonepulleymerelychangesthed...[继续阅读]

    (1)SoilImprovementWorksE:Itisveryclearthatthequalityofundergroundworksisverycriticalforthewholeworks.Wecannotexpectastablesuperstructurewithoutasolidfoundation.C:Thatstrue.Itisourdutytokeepthequalityoftheundergroundworkscompliedwiththespecification.E:Befo...[继续阅读]

    EarlyEarth-MovingMachinesBuildingIronAgeforts,diggingcanals,makingrailroads,andconstructionmodernhighwayshaveallrequiredtheshiftingofhundredsoftonsofsoil.Asaresult,fromtheIronAgetothepresentmenhavedevisedvariousmachinesformovingearth.Oneoftheearliestearth...[继续阅读]

    Manbuiltrailroadslongbeforehebuiltsteamenginesandbeforehehadevenmasteredthebasictechnologyofengineeringwithironandothermetals.Theearliesttrainswereconstructedoftimberandwereinoperationnotlaterthanthefourteenthcentury.Theywerebuilttoovercometheseverelimita...[继续阅读]

    TheearliestbridgeswereprobablylogsthrownacrossstreamsorthestoneslabclapperbridgessuchasthosestillsurvivinginDevon,England.Anothertypeofwatercrossingwasprovidedbybridgesformedbyboatsfixedtogether.TheGreekhistorianHerodotus(485—425BC)providedtheearliestdocu...[继续阅读]

    E:Todayisthefirsttimewedothemonthlysafetypatrols.Isthereeverybodyresponsibleforsafetyfromeachsectionattended?C:Yes.Weunderstandtheimportanceofthesafetyforallsiteworks.Nobodyneglectsit.E:UptonowalldocumentsregardingsafetyrequirementsandstandardsfromtheEmpl...[继续阅读]

    E:Ionceheardabuildingcontractorsaidthatthemostcomplaintshereceivedwerefromtheroofingleakage,isthatcorrect?C:No.Itisalreadyahistory.ButIunderstandwhatyoumean.Anyhowtheroofingconstructionisreallyneededtoputenoughattention.E:Mostofthebuildingsinthispowerplan...[继续阅读]

    Thehighestbuildingconstructedby1975wasSearsRoebuckTowerinChicago.Itis443mtallwith110floors.Ithouses16,500peopleandhas103elevatorsand18escalators.Structuralengineershavecalculatedthatbuildingsupto3kmtallaretechnicallyfeasible.WhyhaveLargeBuildings?Thechief...[继续阅读]

    Ordinarycranes,usedintheconstructionindustryorforloadingships,canliftweightsofupto200t.Butconsiderthefollowingproblems:aprefabricated1,500tsectionofaship(suchasthewholesuperstructureorthefrontpartofthebow)hastobeplacedinitsfinalposition;a6,000trockethasto...[继续阅读]