富水条件下地铁出入口部分主体结构下沉改造关键技术

吴颖宁

doi:10.3973/j.issn.1672-741X.2015.07.018

隧道建设 >

2015 , Vol. 35 >Issue 7: 727 - 732

DOI: https://doi.org/10.3973/j.issn.1672-741X.2015.07.018

施工技术

富水条件下地铁出入口部分主体结构下沉改造关键技术

吴颖宁

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（中铁十八局北京地铁指挥部，北京 100000）

吴颖宁（1982—），男，甘肃白银人，2005年毕业于北京交通大学，土木工程专业，本科，工程师，主要从事地下工程施工和管理工作。

收稿日期: 2013-08-28

修回日期: 2015-06-04

网络出版日期: 2015-07-29

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Key Technologies for Lowering of Structure of Entrance/exit Passage  Tunnel of Metro Works Located in Waterrich Conditions

WU Yingning

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(Beijing Metro Headquarters, China Railway 18th Bureau Group Co., Ltd., Beijing 100000, China)

Received date: 2013-08-28

Revised date: 2015-06-04

Online published: 2015-07-29

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摘要

北京地铁2号线鼓楼大街站西北出入口通道与污水管线位置冲突，导致已完成的明挖结构需进行下沉改造。采用桩间止水帷幕及基底加固等措施，解决了富水条件下出入口明挖段加深改造围护桩嵌固深度不够的问题，确保了改造时基坑的安全；通过防水方案优化及接缝处理等措施，解决了新旧防水结合的问题，实现了新旧结构的良好过渡，确保了施工质量。

关键词： 北京地铁; 出入口; 嵌固深度; 止水帷幕; 基底加固; 新旧防水过渡; 接缝处理

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吴颖宁 . 富水条件下地铁出入口部分主体结构下沉改造关键技术[J]. 隧道建设, 2015 , 35(7) : 727 -732 . DOI: 10.3973/j.issn.1672-741X.2015.07.018

Abstract

The northwest entrance/exit passage tunnel of Guloudajie station on Line 2 of Beijing Metro is constructed by cutandcover method. However, due to the conflict between the completed passage tunnel and the existing sewage pipe line, the passage tunnel has to be lowered. Waterproofing curtain is installed between the piles of the opencut passage tunnel and the floor base of the passage tunnel is consolidated by means of jet grouting piles, which ensures the safety of the foundation pit during the renovation. The waterproofing scheme is optimized and the joint is well treated, which ensures the waterproofing effect of the works.

Key words： Beijing Metro; entrance/exit; embedding depth; waterproofing curtain; floor base consolidation; transition between existing waterproofing structure and new waterproofing structure; joint treatment

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