工程施工中,多采用塔吊作为主体结构施工的垂直运输工具。而塔吊在施工中容易出现小车坏、限位装置坏以及更换钢丝绳、大臂或小轮等。维修时,维修人员从大臂一头一手扶着大臂上管,脚踩大臂下 Construction, the use of tower crane as the main structure of the construction of the vertical transport vehicles. The tower crane prone to car damage in the construction, the stopper device is bad and the replacement of wire rope, booms or ferries. Maintenance, maintenance personnel from arm to arm on the top of the tube, foot under the arm