盾构穿越桥桩区施工技术研究

Study on Construction Technology of Shield Tunnels Crossing Through Bridge Pile Foundations

城市轨道交通工程建设中,往往因线路与既有建(构)筑物的基础结构冲突或过近而绕行或改线,给工程建设带来一定的影响。以郑州市某地铁线路中穿越既有桥梁桩基区域为背景,介绍了灌注桩拔除施工工艺,对新建桩基在盾构近距离穿越期间的性状变化进行了分析,并提出了盾构在类似地层情况下近接施工的建议。

In construction of urban rail transit,the conflict between the line and the foundation of existing structure often lead to realignment or bypass,and it will bring an impact on the construction. Taking a section of shield tunnel crossing through bridge piled foundation in Zhengzhou as background,this paper introduces the methods to pull out deep pile,analysis the characteristic change of new piles during crossing time. The research results puts forward some suggestions on the similar adjacent construction projects.