起重機頂鉤(脫鉤)事故

dinggoushiguduofashengzaiqiaoshihuomenshiqizhongjishang
，yingaoduxianweishilingerzaocheng。tongshizaiqitaleixingqizhongjishangyishiyoufasheng。tuogoushigushizhizhongwuhuozhuanyongdiaojucongdiao鉤口脫出而引起的重物失落事故。其主要原因是由於吊鉤的索具防脫裝置失效或吊裝方法不當而引起。