某高速公路跨线人行天桥采用钢筋混凝土斜腿刚构结构体系,因桥下车道拓宽既有天桥斜腿侵占桥下通行净空,且受多因素影响该天桥无法爆破重建,针对该情况,该文提出了斜拉桥及钢管拱桥两个天桥结构体系改造方案,经过比选确定斜拉桥为优选方案,文中阐述了其设计流程、结构分析及施工要点。 Due to the bridge underpass lanes widening the clearance clearance of existing bridges over the bridge under the bridge, and due to many factors, the bridge can not be demolished and reconstructed. In view of this situation, Proposed a cable-stayed bridge and steel arch bridge two flyover structural system transformation program, after comparing the cable-stayed bridge to determine the preferred program, the paper describes the design process, structure analysis and construction points.