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Five-yearretrospectionofconstructioncraneindustrySpecialArticleSpecialArticleSpecialArticleSpecialArticleSpecialArticle(actualproductionisestimatedmorethan610millionCubicmeters),476millionCubicmetersof22.8percentincreasecomparedin2006,378millionCubicmetersgrowthof25.9percentin2006than2005,ItreflectsthatChinaready-mixedconcreteindustryisstillinhigh-speeddevelopmentstage.ConcreteMixingconcretewillgraduallybereplacedbyready-mixedconcrete.Thedirectionofdevelopmentinthecommercializationofconcretewillprovideagreatdevel-opmentopportunitytodomesticmachinerymanufacturers,morethan10percentdemandgrowthrateannuallyexpected.22Five-yearretrospectionofconstructioncraneindustryIntherecentfiveyears,theconstructioncraneindustrycamethroughasustained,rapidandsounddevelopment.From2002to2007,thesalesvolumedevelopsfrom6,400toover20,000,andtheamountofsalesincreasesfrom3.3billionyuanto16billionyuan.XCMG,theproductionplantfiveyearsagohasbecomethepowerfulmanufacturer,andnowitisprovedtobetheleadingofthemarket.Thechiefdidsaythat:onewhocanreallybringChinesecraneindustrytotheworld,wewillapplaudforhim.27MergersandAcquisitionsoftheConstructionCraneindustryissurgingThefirstquarterof2008,thetwoseriesofmergersandacquisitionsinthecraneindustryoftheChinaEngineeringwereveryimpressive.February22,2008,GuangxiLiugongMachineryCo.,Ltd.acquiredBengbuCityvibratorAmwayConstructionMachineryCo.,Ltd.stakeintheestablishmentofthereorganizationLiugongCraneCo.,Ltd.inAnhui.March31,2008,ManitowocannouncedattheestablishmentofjointventureswithDongyueHeavyIndus-triesCo.,Ltd.inTai'an,50percentofDongyueHeavyIndustriesstakewasbrought.Inrecentyears,astheimprove-mentofChina'scraneindustryintheglobalmarketposition,industrycompetitionbecomemoreintense,theprojectsetoffacraneindustryconsolidationmergersandacquisitionsboom.35AnalysisofNACHIexcavatorloadsensitivityhydraulicpressuresystemMinitypehydraulicexcavatornotonlyhasthestrongpointofexquisiteandflexible,butalsopossessthefunctionofmedium-sizedexcavator.Thehydraulicsystemisoneofthemostimportantpartsoftheproduct,andtherearemanyvarietiesofthesystem.Mostofthehydraulicsystemsappliedinminitypeexcavatorarefromoverseas,NACHIisjusttheonewhichisfromJapan.40TransientanalysisofluffingmechanismofhydraulicroofbolterAsthecityundergroundspaceisbeingexploitedandappliedforprojectssuchassubway,underwatertunnel,under-groundgarage,undergroundcommercialcity,andsoon,andbecauseoftheconstructionconditionandhydrologicalcondition,thedevelopmentdirectionmustmeettherequirementsofwide-bound,fulldepth,highpilecapacityandhighreliability.Soempolderafullhydrauliccrawlerroofbolterwhichcanadaptthetwoconditionsanddeepfoun-dationpitsupportisimperative.53InstallationofM1280DtowercraneforCCTVNewHeadquartersTheCCTVNewHeadquartersstructurecontainstwosimilartower,1#towerand2#tower,withdifferentscaleheightsat234mand194m.Therearea14-floorcantileverconstruction,a10-floorpodiumbuildinganda3-floorbasementconnectthetwotowers.Toaccomplishthehoistingofconstructionmateriel,twotowercranesaresetforeachtower,withthemodelofM1280DandM600D.