摘要
富水砂层是一种软弱地层,具有稳定性差和高灵敏度等特性,城市富水砂层盾构施工安全风险性高,特别在盾构机接收施工时易发生涌水涌砂等现象,处理不当时易引发较大事故。以南通市地铁1号线04标一工区中青盾构区间在全断面粉砂层中盾构机进洞施工为研究背景,针对盾构接收端头地质条件复杂,毗邻城市高危建(构)筑物、地下管线错综密集,不能采取主动降水的情况,提出盾构接收过程中采用“垂直冷冻加固+钢套筒接收”的双重叠加接收方案,开发了“先盾身、后两侧,先一排、后二排”冷冻管拔除技术、两道弹簧止水钢板洞门止水装置技术、自来水回填钢套筒接收技术等关键技术,有效规避了渗漏风险,最终实现盾构的安全顺利接收,可为类似工程提供借鉴。
Water-rich sand layer is a kind of soft stratum,which has the characteristics of poor stability and high sensitivity.The safety risk of shield construction in urban water-rich sand layer is high,especially in the process of shield machine receiving construction,the phenomenon of water and sand gushing is easy to occur,which is easy to cause large accidents when improperly handled.This paper takes the shield machine tunneling construction in Zhongqing shield tunnel section of Bid-04 No.1 working area of Nantong Rail Transit Line 1 as the research background.In view of the complex geological conditions at the receiving end of shield,dense high-risk buildings and underground pipelines in adjacent cities,and the inability to take active precipitation,a double superposition receiving scheme of“vertical freezing reinforcing+steel sleeve receiving”is put forward in the process of shield receiving,and some key technologies are developed,such as the frozen pipe extraction technology of“shield body before both sides,two rows after a row”,two spring water stop steel plate hole water stop device technology,tap water filling steel sleeve receiving technology,which effectively avoids the risk of leakage.Finally,the safe and smooth receiving of shield is realized,which can provide reference for similar projects.
作者
廖日才
LIAO Ricai(China Railway 17th Bureau Group No.6 Engineering Co.Ltd.,Fuzhou Fujian 350009,China)
出处
《铁道建筑技术》
2021年第11期122-126,共5页
Railway Construction Technology
基金
中铁十七局集团有限公司科技研究开发项目(2018-30)。
关键词
透水砂层
管线
盾构接收
洞门垂直冷冻法
全套筒
permeable sand layer
pipeline
shield receiving
portal vertical freezing method
full sleeve
