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某市一建筑工地在用的一台QTZ80塔机2006年在拆卸降节过程中,顶升油缸活塞杆断裂,导致塔机上部结构(包括塔顶、上下回转支座、司机室、平衡臂总成、起重臂总成,顶升架等)突然坠落,造成2人重伤的重大事故。
A QTZ80 tower crane used at a construction site in a city In 2006, during the process of demolition and dislocation, the piston rod of the jacking cylinder fractured, which led to the structure of the superstructure of the tower crane (including the tower top, the upper and lower slewing bearings, driver’s cab, balance arm Into, jib assembly, jacking, etc.) suddenly crashed, causing two serious injuries to a major accident.