在塔式起重机上多处采用高强度螺栓连接，如塔身标准节之间、上下支座与回转支承之间等处。为充分发挥高强螺栓体积小、承载能力大的优点，高强螺栓连接副应按GB／T13752－93塔式起重机设计规范》表UZ规定的预紧力矩加以紧固。但在实际使用中，因塔机生产厂家多未随机配备力矩 High-strength bolts are used on tower cranes in many places, such as between tower standard sections and between upper and lower bearings and slewing rings. In order to give full play to the advantages of high-strength bolts with small volume and large bearing capacity, the high-strength bolt joints should be tightened according to the pre-tightening torque specified in Table UZ of GB/T 13752-93 Tower Crane Design Code. However, in actual use, because the tower crane manufacturers do not have random torque