管幕洞桩法地铁车站设计施工关键技术研究

doi:10.3973/j.issn.2096-4498.2020.04.009

隧道建设（中英文） ›› 2020, Vol. 40 ›› Issue (4): 531-537.DOI: 10.3973/j.issn.2096-4498.2020.04.009

管幕洞桩法地铁车站设计施工关键技术研究

李铁生^{1, 2}

(1. 北京市轨道交通设计研究院有限公司, 北京　100068; 2. 北京市轨道交通工程技术研究中心, 北京　100068)

收稿日期:2019-10-29 出版日期:2020-04-20 发布日期:2020-04-30
作者简介:李铁生(1981—),男,河北三河人,2017 年毕业于同济大学,结构工程专业,硕士,高级工程师,主要从事岩土工程、地下工程等领域的设计与研究工作。E-mail: 137418052@ qq. com。

Key Technologies for Design and Construction of Metro Station by Pipe-roof PBA Method

LI Tiesheng^{1, 2}

(1. Beijing Rail and Transit Design & Research Institute Co., Ltd., Beijing 100068, China; 2. Beijing Rail and Transit Engineering Technology Research Center, Beijing 100068, China)

Received:2019-10-29 Online:2020-04-20 Published:2020-04-30

摘要/Abstract

摘要：

当暗挖地铁车站受限于环境条件采用平顶直墙的结构型式时,为保证车站结构安全实施,可采用管幕洞桩法进行施工,即利用车站上层先行导洞沿车站顶板结构上方打设横向大直径密排管幕,形成一个能够抵御结构上部土体荷载的强支护结构,继而在管幕保护下进行洞桩法后续施工。以北京地铁19 号线工程右安门外站为工程背景,阐述管幕洞桩法地铁车站的施工工序及工艺特点,对复杂环境条件下管幕打设、导洞开挖、打桩、扣拱等关键技术环节进行分析,明确其设计施工中的技术要点,并对车站施工监测数据进行分析。结果表明: 1)管幕打设和导洞开挖是管幕洞桩法引起地层沉降的关键工序; 2)管幕洞桩法施工对周边环境和地表沉降影响较小,适合修建超浅埋、大断面、复杂地质条件下的暗挖地铁车站。

关键词: 暗挖地铁车站, 管幕洞桩法, 管幕打设, 导洞开挖, 扣拱, 施工监测

Abstract:

When the mined metro station is limited by the environmental conditions, the structure of flat roof and straight
wall has to be adopted. Hence, in order to ensure the safe implementation of the station structure, the pipe-roof PBA
method can be used for construction. In order to form a strong supporting structure which can withstand the soil load, the
transverse large-diameter dense-row pipe-roof is set up along the top of the roof structure of the station by using the pilot
tunnel of the upper layer of the station, and the rest of the structures are constructed under the protection of the piperoof.
The construction procedure and technological characteristics of the pipe-roof PBA method adopted in You′anmenwai
Station of Beijing Metro Line 19 are introduced. The key technologies of the pipe-roof PBA method under complex
environmental conditions, i. e. pipe-roof construction, pilot tunnel excavation, pile driving and arch buckling, are
analyzed. The technical points in design and construction phase are clarified. Meanwhile, the construction monitoring
data of the station are analyzed, and the analytical results show that: (1) the pipe-roof construction and the pilot tunnel
excavation are the key processes of the ground settlement caused by the pipe-roof PBA method; (2) the pipe-roof PBA
method has little influence on the surrounding environment and surface settlement, which is suitable for the construction
of mined station with super shallow buried, large cross-section and complex geological conditions.

Key words: mined metro station, pipe-roof PBA method, pipe-roof construction, pilot tunnel excavation, arch
buckling, construction monitoring

中图分类号:

U 45

李铁生. 管幕洞桩法地铁车站设计施工关键技术研究[J]. 隧道建设, 2020, 40(4): 531-537.

LI Tiesheng. Key Technologies for Design and Construction of Metro Station by Pipe-roof PBA Method[J]. Tunnel Construction, 2020, 40(4): 531-537.

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管幕洞桩法地铁车站设计施工关键技术研究

Key Technologies for Design and Construction of Metro Station by Pipe-roof PBA Method

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