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大型建筑及设备安装工程需要大型起重设备。它促使工程起重机向大型化发展。70年代的起重机生产中,汽车起重机占相当大的优势,目前。大型液压伸缩臂汽车起重机最大起重量为200～400吨,但产量不大。桁架臂汽车起重机最大起重量为800～1000吨,但1000吨半拖挂式,其部件需30辆卡车协助运输,这已失去了机动灵活、便于转移的优点。总之,它们的大型化受到越来越多的限制。相比之下,能自行转移,能带载运行且起重能力大的履带起重机显示出一定优越性。加之履带式本身通过性能好、牵引系数
Large-scale construction and equipment installation projects require large-scale lifting equipment. It promotes the development of large-scale construction cranes. In the production of cranes in the 1970s, truck cranes accounted for considerable advantages. The maximum lifting capacity of a large hydraulic telescopic boom truck crane is 200-400 tons, but the output is not large. The truss arm crane has a maximum lifting capacity of 800 to 1,000 tons, but a 1,000 ton semi-trailer type requires 30 trucks to assist in transportation. This has lost the advantages of flexibility and ease of transfer. In short, they are increasingly limited in their size. In contrast, crawler cranes that are capable of self-moving, capable of carrying loads, and having a large lifting capacity exhibit certain advantages. In addition, the track type itself has good performance and traction coefficient.