地铁车站出入口顶管施工探析
2012-04-23刘良富
刘良富
摘要:随着城市建设的高速发展,地下空间的开发利用越来越受到重视。目前,地铁车站出入口施工常采用的工法是矩形顶管施工,这是由于矩形顶管施工工艺施工时具有地下管线搬迁少,对地面道路交通影响小,以及低噪音、无扬尘的特点;再者,隧道和地下通道,截面通常为圆形,矩形结构则能充分利用结构断面,提高断面利用率,减少地下掘进面积,有利于降低工程总体造价。本文详细介绍了矩形顶管的施工工艺及实施,对矩形顶管施工中容易出现的问题提出了控制措施,可供其它类似工程借鉴。
关键词:顶管施工;矩形顶管施工;地铁出入口
Abstract: with the rapid development of urban construction, the development and utilization of underground space is receiving more and more attention. At present, the construction of subway station entrances often used methods is the rectangular pipe jacking construction, this is because the rectangular pipe jacking construction technology during the construction of underground pipeline removal with less, to the ground road traffic impact is small, and low noise, no dust characteristic; Moreover, tunnel and underground passage, section usually is circular and rectangular structure, can make full use of structural section, improve the utilization rate of section, reduce the underground drivage area, which is beneficial to reduce the overall cost of the project. This paper introduces the rectangular pipe jacking construction technology and the implementation of the rectangular pipe jacking construction of the problems easy to control measures are put forward, which can be reference for other similar projects.
Keywords: pipe jacking construction; Rectangular pipe jacking construction; Subway entrances
中图分类号: TU74 文献标识码:A 文章编号:2095-2104(2012)
前言:矩形顶管施工地下通道的优势在于不需要搬迁地下管线,不破坏地面道路结构,也丝毫不影响现有道路交通的正常运行,一切施工均在道路面以下进行,采用先进的土压平衡项管机,施工期间无噪音,地面沉降及地下管线的变形均在可控制范围。上海轨道交通7号线汶水路车站1号出入口矩形通道施工攻克薄覆土和近距离穿越管线的难题。海轨道交通6号线浦电路车站矩形地下通道首推成功,取得了大截面掘进(6.24m×4.39m)、高精度施工、地面沉降小于3cm的成果。上海轨道交通13号线长清路车站3号出入口矩形通道施工攻克始发工作井狭小以及呈不规则多边形的难题,采用矩形掘进机与后顶设备二次到位的始发顶进方法,成功穿越净距1.72m,直径2m的合流污水干管以及近邻工作井3.8m的电缆箱涵隧道,地表沉降控制在2.5cm之内。……
