一、事故分析当塔机的塔身8与臂杆2夹角为45°时(参见图1),开动起升卷扬机,将约450公斤的重物Q起吊到离地面4米高处。在变幅过程中,即夹角由45°减小到10°时(如图1状况),忽听咔嚓两声响,塔身与回转平台5的两根紧固螺栓3蹦出(螺栓为M24),塔身随即绕着固定铰支座7的K点旋转后倾,整机侧向倒塌在地。这是塔吊司机违章操作的结果。 I. Accident Analysis When the angle between the tower body 8 and the boom 2 of the tower crane is 45° (see Figure 1), the hoisting hoist is started and the weight of about 450 kg is hoisted to a height of 4m from the ground. In the process of amplitude change, when the angle is reduced from 45° to 10° (as in Figure 1), the two fastening bolts 3 of the tower body and the slewing platform 5 are pulled out (the bolt is M24). ), the tower body is then rotated back and forth around the K-point of the fixed-hinge bearing 7, and the entire machine collapses laterally. This is the result of the illegal operation of the crane driver.