China Railway Tunnel Group rubber crane is a kind of full swing crane mounted on a special chassis composed of heavy-duty tires and axles, its superstructure is basically the same as the crawler crane, in order to ensure the stability of the installation of the operating body, the crane is equipped with four retractable legs. On flat ground, small lifting capacity lifting and low-speed driving of lifting objects can be carried out without outriggers. It consists of two parts: getting on and off the bus. The loading part is the lifting operation part, equipped with boom, lifting, luffing, counterweight and turntable, etc.; Get off for the support and walking part. The upper and lower carriages are connected by slewing rings. When lifting weight, it is generally necessary to put down the outriggers, increase the supporting surface, and level the fuselage to ensure the stability of the crane.