塔式起重机的主要工作性能指标之一是起重力矩。为使其安全可靠运行,吊臂上任意吊点上的计算力矩(包括风载等),应保证不大于倾翻力矩。计算力矩包括两个部分:一是吊臂自身重量引起的力矩,当臂长一定时是一个常量(风载按一定值选取);另一部分是吊重力 One of the main performance indicators of tower cranes is lifting torque. To ensure safe and reliable operation, the calculated moment (including wind load, etc.) on any hanging point on the jib should be less than the tilting moment. Calculating the torque includes two parts: one is the moment caused by the crane’s own weight, which is a constant when the arm length is constant (the wind load is selected by a certain value); the other part is the lifting weight.