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随着高层建筑的不断增加,塔吊在施工生产中的应用日益广泛,随之而来的是事故的不断增加。在某特大桥施工工地,2#墩0#预制梁进行起吊作业,需将预压在0#预制梁支架上的钢绞线吊至地面,所用设备为塔式起重机,塔吊提升高度30m、起重力矩4万kg·m、起重质量4t,塔吊司机张晨(化名)负责吊装。2#墩0#预制梁支架上两人负责挂钩及打信号,地面两人负责摘钩及打信号。当起吊第十一盘钢绞线时,张晨在看到起吊信号后,将钢绞线从支架上吊起,此时吊距为10m,然后开动小车使其沿着塔臂向前滑行。这时限位器失控,小车滑行至距塔身中心水平距离15m的塔臂处,塔臂突然从小车处折断,小车与钢绞线坠落至地面。
With the continuous increase of high-rise buildings, tower cranes are widely used in construction and production, with the consequent increase of accidents. In a bridge construction site, 2 # pier 0 # prefabricated beam lifting operations, the prestressed prestressed beam in the 0 # beam should be hoisted to the ground, the equipment used for tower cranes, tower crane lifting height of 30m, Weight moment 40,000 kg · m, lifting quality 4t, tower crane driver Zhang Chen (a pseudonym) is responsible for lifting. 2 # Pier 0 # prefabricated beam bracket on the two responsible for hooking and playing signal, the ground responsible for picking two hook and hit the signal. When lifting the eleventh plate strand, Zhang Chen saw the lifting signal, the strand from the stent hoisted at this time the suspension distance of 10m, and then start the car to slide along the tower arm forward. At this point the stopper out of control, the car taxiing to the tower from the center of the horizontal distance of 15m tower arm, the tower arm suddenly broke off from the car, car and strand fell to the ground.