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正确确定下旋塔机塔顶支撑结构设计参数是改善塔身受力状态和上司机室工作条件的关键。由于下旋式小车变幅塔机吊臂基本固定在水平和仰角30°两种工况下工作,完全可以用较简单轻便的撑架式塔顶支撑结构实现上述目的。目前下旋式小车变幅塔机撑架式塔顶支撑结构有单撑架式、双撑架式、三撑架式和撑架平衡臂式四种基本类型。其中撑架平衡
Correctly determining the design parameters of the support structure of the tower crane tower is the key to improving the tower body stress conditions and the working conditions of the upper cab. Since the boom of the down-rotating trolley luffing tower crane is basically fixed under two conditions of horizontal and elevation angles of 30°, it is entirely possible to achieve the above-mentioned purpose by using a simpler and lighter strut-type tower top support structure. At present, the supporting tower top supporting structure of the downhill type tower crane has four basic types: single-support type, double-support type, three-support type and support balance arm type. In which the balance of support