Construction Technology and Application of Freezing Method for Long Connecting Passage of Shield Tunnel
Based on the freezing project of 3#contact channel of Wulongkou Station to Tongle Station of Zhengzhou Rail Transit Line 8,this paper summarizes the key technologies of long-distance contact channel construction in detail,including freezing reinforcement scheme,key points of freezing construction technology,construction risk and countermeasures,and verifies them through on-site construction and measured data.For the freezing construction of long-distance contact channel,measures such as arranging freezing pipes on both sides,monitoring pressure in real time and setting pressure relief holes,timely follow-up grouting during thawing period,and applying steel arches if necessary can effectively reduce the risk in the freezing construction of long-distance contact channel.During the freezing construction of this project,the measured surface frost heave displacement and the vertical uplift displacement of the segment are less than 6mm,the thawing settlement after thawing is less than 10mm,and the vertical displacement of the initial support of the contact channel is less than 2.1mm,which verifies the reliability of the construction technology of this project and can provide reference for similar long contact channel freezing excavation projects.
万方数据
维普
