复杂环境下地铁车站利用既有结构拓建附属结构施工方法

Construction Method of Expanding Subsidiary Structure by Existing One of Subway Station Under Complex Environment

以北京市地铁8号线王府井北站为例,对复杂环境下地铁车站利用既有结构拓建附属结构的施工方法进行研究。首先建立有限元模型,用数值模拟的方法对5种拓建工法做了计算分析,对比拓建结构、既有结构及周边环境风险点的应力位移,来确定最佳施工工序;然后通过受力转换将拓建结构与既有结构有效结合,最大化地利用了既有结构,有效节约了施工成本、控制了沉降变形、降低了施工安全风险。以期该施工方法为今后类似拓建工程的设计和施工提供技术指导。

Taking Wang Fujing North Station of Beijing Metro Line 8 as an example, a construction method of expanding subsidiary structure by existing structure of subway station under complex environment is studied. Firstly,finite element model is built to calculate five extension methods. The best construction procedure is determined by comparing the stress displacement of extension structure, existing structure and risk points around environment.Through the force conversion, the extension structure and the existing one are effectively combined so that the existing structure can be maximize used, cost be saved, settlement displacement be controlled and safety risk be reduced.It is hoped to provide technical guidance for the design and construction of similar extension projects in future.