软土地区隧道区间风井吊筑法施工工艺研究  

Analysis of Ventilation Shaft Construction Technology in Soft Soils with "Hanging and Top-Down Method"

作　　者：杨子松[1,2] 彭芳乐[1] 谭勇[1] 张正 

机构地区：[1]同济大学地下系,上海200092 [2]上海建工(集团)总公司技术中心,上海200083

出　　处：《地下空间与工程学报》2011年第1期99-105,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家"十一五"科技支撑计划项目(2006BAJ27B02)

摘　　要：隧道中间风井基坑通常在隧道穿越前施工完毕,盾构机穿越风井之后完成风井剩余结构。此方法导致风井基坑开挖深度深,盾构需在较短范围内完成进出洞工序各一次,工期及造价损失严重,风险也比较高。本文介绍了一种风井吊筑法施工工艺:隧道从较浅风井基坑下部快速穿越,从风井基坑底部往下逆筑开挖风口至隧道结构,逆筑期间不予降水。本文还将解决此工法运用中碰到的问题,特别是盾构近距离下穿基坑时的施工参数设定及开挖对已建隧道的变形控制问题。Before a shield ＇ s arriving, the pit of a tunnel ＇ s ventilation shaft must be built, the left structure of the ventilation shaft will be built after the leave of the shield. This method needs to construct a deep pit, and at the same time, the shield must complete an arriving and departure process in a short interval. This situation increases the construction cost, period and risk too. In this paper, ＂Hanging and Top-Down Method＂ of ventilation shaft construc- tion technology will be described. Using this method, the shield passes a more shallow ventilation shaft pit quickly just close beneath it, the vents between the tunnel structure and the floor of ventilation shaft pit are constructed later using a technology similar to ＂top-down method＂, and the vent structure hang at the floor of the pit, no dewatering adopted during the construction. This paper will also address efforts at solving the problems the technology encountered, especially the construction parameter setting when shield passes the pit just close beneath it and the method to control the deformation of tunnel structure.

关 键 词：风井 吊筑法 施工参数 隧道变形 

分 类 号：TU745.3[建筑科学—建筑技术科学]