针对一起架桥机倒塌事故,通过现场勘查、分析排除架桥机桁架结构破坏、起升机构失效或故障、前支腿结构失稳、超载或者撞击失稳的可能。最后断定由于施工人员违规使用橡胶块支垫前支腿,导致架桥机失稳倒塌。此事故再次用血的教训说明起重机械安全管理的重要性,必须严格遵守安全生产管理制度。 Aiming at a bridge crane collapse accident, through the on-site survey, it analyzes and eliminates the possibility of truss truss structure destruction, failure or failure of hoisting mechanism, instability of front leg structure, overloading or instability of impact. Finally concluded that as a result of construction workers irregular use rubber pad pad before the legs, leading to instability erecting machine collapsed. This accident once again shows the importance of the safety of lifting machinery with the lesson of blood, we must strictly abide by the safety management system.