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作为建筑施工中起主导作用的自升式塔式起重机，在拆卸过程中，往往发生顶升系统以上结构倾翻的恶性事故。如１９９７年１０月１３日上午，上海某工地拆除ＱＴＺ－８０型自升式塔式起重机时，由于上部结构的倾翻，造成６人死亡，１人重伤，且塔机报废。同一天，河南郑州也出现
As a self-elevating tower crane that plays a leading role in building construction, during the disassembly process, a serious accident of tipping over the structure above the jacking system occurs. For example, on the morning of October 13, 1997, when removing a QTZ-80 self-elevating tower crane at a construction site in Shanghai, six people were killed, one seriously injured and the tower crane was scrapped because of overturning the superstructure. The same day, Zhengzhou, Henan Province also appeared