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1992年6月30日上午,一建筑施工单位在某地跨线桥施工现场进行扶墙吊拆除作业。他们将扶墙吊降到最低位置(爬升框架落地),基础框架拆除至最后一节(高度3.79m),同时,驾驶室、平衡臂上的二块配重及其他配件也被拆除,做好了吊臂的拆除准备。下午4时左右,队长带领6名职工(其中合同工3名)爬上扶墙吊,采用20t汽车吊进行吊臂拆除作业。当扶墙吊吊臂拆除下来并落至桥面时,扶墙吊整个塔身处于不平衡的失重状态.瞬间,只听得轰隆一声巨响,该扶墙吊朝平衡臂偏重方向倾倒。基础
On the morning of June 30, 1992, a construction contractor dismantled the wall-hanging crane at the construction site of a flyover bridge. They lowered the buttress wall to the lowest position (climbing frame landing), the basic frame was removed to the last segment (3.79m high), and two counterweights and other accessories on the cab and balance arm were also removed Prepared to dismantle the boom. At about 4 pm, the captain led six workers (including three contract workers) to climb on the wall-hanging crane and used a 20t truck crane to carry out boom-lifting operations. When the crane arm is removed and falls to the bridge deck, the tower crane is in an unbalanced state of weightlessness, and in an instant, only a loud bang is heard, which tilts towards the balance arm. basis