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在进行建筑用塔式起重机的标准节连接过程中,连接螺栓的选用和安装存在以下问题:紧固螺栓时没有按规定的拧紧力矩紧固、同一截面上的塔身连接螺栓拧紧力矩不统一、高强度螺栓重复使用或采用性能等级低的螺栓代替,以及螺栓紧固时紧固力矩大小无法控制等,严重时连接螺栓发生断裂,造成倒塔事故的发生。提出安装塔身连接螺栓的注意事项,并介绍螺栓预紧力的控制方法和参考值。
During the standard section connection of tower crane for construction, the selection and installation of connecting bolts have the following problems: the fastening bolts are not fastened according to the stipulated tightening torque, the tightening torque of the tower body connecting bolts on the same section is not uniform, Replacement of high-strength bolts or the use of low performance grade bolts instead of bolts and tightening torque when the size can not be controlled, etc., serious fracture occurred when connecting bolts, causing the down tower accident occurred. Put forward the precautions of installing the tower connecting bolt, and introduce the control method and reference value of the bolt pretightening force.