部分城市轨道交通工程建设中会遇到线路穿越既有建(构)筑物情况。结合上海轨道交通15号线长风公园站—天山路站区间隧道穿越人行天桥桩基案例,通过对天桥上、下部结构改造方案的分析对比和计算,最终选择将天桥上部结构混凝土连续梁改换成简支钢梁,盾构推进时直接切削桩基,由壁后注浆体和周围土体形成新的持力层承担桥梁荷载的方案。 Some urban rail transit projects will encounter the line through the existing building (structure) building situation. Based on the case study of Changfeng Park Station - Tianshan Station Crossing Tunnel across footbridge of Shanghai Rail Transit Line 15, through the analysis and comparison of the upper and lower structures, the final choice is to change the concrete continuous beam of superstructure of flyover As a simple supported steel beam, when the shield is advanced, the pile foundation is directly cut, and a new bearing layer is formed by the post-grouting grout and the surrounding soil to bear the load of the bridge.