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1、CranesCranesMobileCranesMechanicalorhydraulictypesMechanicalalsoreferredtoas“conventional”craneMechanicalcraneshavegreatercapacityHydrauliccraneshavegreatermobilityandrequirelesssetuptimeCranesMobileCranesLatticeboomortelescopicboomCranecapacityiscontrolledbyitsoperatingra
2、diusOperatingradiusis:horizontaldistancefromcenterofrotationtothehookafunctionofboomlengthandboomanglewiththehorizontalCranesMobileCranesOtherfactorsthatinfluencecapacity:positionofboomwithrespecttothecarrieri.e.:overthefrontvs.overtherearorsidesamountandconfigurationofthe
3、counterweightconditionofthesupportingsurfacetirecapacity(stationaryandpick&carry)CranesLiftingDataCranemanufacturersprovideliftingdatathatincludes:RangediagramLoadratingchartsPCSARatingClassMiscellaneousnotesanddimensionsCranesLiftingDataPCSARatingNumberfirstnumberindicate
4、stheoperatingradiusfornominalcapacitysecondnumberindicatestheratedload(inhundredsofpounds)ata40’operatingradiususinga50’boomallloadsaretakeninthedirectionofleaststabilitywithoutriggerssetgoodwaytocompareappleswithapplesCranesLiftingDataLoadRatingChartsliftingcapacitiesbase
5、don?85%oftippingloadonoutriggersliftingcapacitiesbasedon?75%oftippingloadontiresandcrawlershookblocks,slings,spreaders,andotherliftingdevicesarepartoftheload?includeaspartofthemaximumsafeloadordeducttheirweighttodeterminenetloadcapacityTowerCranesHeavyliftingfortallbuildin
6、gsMax.unsupportedheighttypically265’(80m)Muchgreaterheightswhensupportedbybuilding’sframeworkTowerCranesMax.reach230’(70m)Max.lift19.8Tons(18t)Counterweight=20TonsMaximumload-moment=300tonne-meterex.:30m(100’)radiusyieldsa10tliftingcapacityLimitswitchesformax.load&load-mom
7、entTowerCranesMastanchor-boltedto30’x30’x4’padConcretepadweighsover500,000#’sMastsectionsaretypically20’x10’squareTowerCranesSlewingunitmountsattopofmast(tower)Cat-head,jib,trolley,machineryarm,ties,&operator’scabMachineryarmcontainsmotors,electronics,cabledrum,andcounterw
8、eightTowerCranesUtilityConstructionUndergroundvs.aerialPublic&privateTransmission,distrib
