地铁区间隧道下穿既有桥梁的桩基托换

地铁区间一般沿城市交通干道敷设,由于线站位的布置受地面环境的制约,有时不可避免地要穿越市政桥梁,桥梁桩基础有可能侵入地铁线路区间隧道,而对于侵入地铁线路空间的桩基必须进行托换截除。以西安地铁1号线三桥站——皂河站工程为例,通过桩基托换的设计方案比较,认为采用明挖基坑托换方案最佳。还介绍桩基托换施工设计的主要技术细节。

Bridge Pile Foundation Underpinning in Subway Tunnel

Subway line is generally laid under the major urban roads.As the line’s layout is often constrained by the ground environment,sometimes unavoidably a subway line passes through the municipal bridges.Thus,it is very possible that the bridge pile foundation will invade into metro tunnels,so the pile foundation underground space must be underpinned and cut off.Through a bridge project of Xi’an Metro Line 1,the design and construction technology for underpinning is introduced.