待拆城市立交桥地处交通要道,交通流量大,周边民宅及办公楼密集,环境极为复杂,确保桥下行车、行人安全、降低对周边环境的影响以及保留柱墩结构不受损伤是桥梁拆除的关键。结合工程实例,详细介绍了桥面结构切割、吊装及运输、钢支撑设置及交通导改等关键工序。结果证明,施工期间桥下道路可正常通行,噪声小且不产生粉尘,取得了良好的经济效益和社会效益。 To be demolished city overpass is located in traffic arteries, traffic flow, the surrounding densely populated houses and office buildings, the environment is very complex, to ensure traffic under the bridge, pedestrian safety, reduce the impact on the surrounding environment and to maintain the pillar pier structure is not damaged bridge demolition key. Combined with engineering examples, the paper introduces in detail the key processes such as cutting, hoisting and transportation of deck structure, setting of steel support and traffic guidance. The results show that during the construction of the road under the bridge can be normal, low noise and does not produce dust, and achieved good economic and social benefits.