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3～4吨自升塔式起重机是一种内爬式塔式起重机,主要用于高层预制装配整体式框架结构,安装在建筑物内部结构上,能随着建筑物的增高而逐步向上提升,习惯上也称为“爬塔”。这种起重机是将原国产2～6吨塔式起重机更换和增加一些部件及辅助装置改装而成的。其最大起升高度从地面至吊钩为80米(受2～6吨塔式起重机卷扬机绳容量限制);最大起重能力为60吨-米;幅度在15～20米时起重量为3吨,幅度在15米以内
The 3 to 4 tons self-elevating tower crane is a type of inner-crawler tower crane. It is mainly used for high-rise prefabricated integral frame structures. It is installed on the internal structure of buildings and can gradually increase upwards with the increase of buildings. Also known as “climbing tower”. This kind of crane is made by replacing the original domestic 2 to 6-ton tower crane and adding some components and auxiliary devices. The maximum lifting height is 80 meters from the ground to the hook (limited by the hoisting rope capacity of 2 to 6 tons of tower cranes); the maximum lifting capacity is 60 tons-meter; the weight is 3 tons when the amplitude is 15-20 meters. , within 15 meters