与在建地铁共线的城市桥梁基础及基坑维护方案研究

Research on Maintenance Schemes for Urban Bridge Foundations and Foundation Pits Shared with Under-construction Subway Lines

摘要:

随着社会的不断发展，许多城市修建了越来越多的城市快速路和地铁。由于快速路网和地铁网的不断加密，城市快速路和地铁共线的情况也越来越多。在临近既有地铁或在建地铁的工况下新建城市快速路，如何采取措施才能保证各自结构的安全至关重要。依托上海某城市快速路新建工程，针对该工程与在建地铁共线的情况，着重对该工程临近地铁位置的设计方案进行研究，重点进行桥梁基础形式的比选和分析，提出了桩基形式采用钻孔桩桩底注浆+永久钢护筒、基坑形式采用贴壁式永久拉森钢板桩的保护方案，为相似的临近地铁的城市桥梁新建工程提供参考。

Abstract:

With the continuous development of society, an increasing number of urban expressways and subways is built in many cities. Due to the continuous densification of the expressway network and the subway network, there are more and more cases where urban expressways and subways share the same lines. Under the condition of newly building the urban expressways adjacent to the existing subways or under-construction subways, it is of vital importance to take the measures to guarantee the safety of their respective structures. Relying on a new urban expressway project in Shanghai, aiming at the situation that this project shared with the under-construction subway line, the focus is on studying the design scheme of this project adjacent to the subway position, and the foundation form of foundation pit is specially compared and analyzed. A protection scheme is proposed, which adopts the bored pile bottom grouting + permanent steel casing for the pile foundation form and the wall-mounted permanent Larsen sheet piles for the foundation pit form, providing a reference for the construction of similar new urban bridge projects adjacent to subways.