富水圆砾地层盾构短套筒接收施工关键技术

发布时间：2018-03-10 08:04

  本文选题：城市轨道交通　切入点：圆砾地层　出处：《都市快轨交通》2017年03期 　论文类型：期刊论文

【摘要】：富水圆砾地层因其含水量高、渗透系数大、化学注浆加固成形率差,增加了盾构接收进洞的施工难度。以南宁轨道交通1号线10标白苍岭—火车站站区间盾构接收进洞施工为例,运用"接长补短"理念,创新性地提出盾构短套筒接收施工工艺。在洞门环板前端通过增加短套筒的方式延长盾构机接收长度,使盾构机接收位置前移,盾构机在短套筒的保护下能够完全进入端头加固区,结合对盾构机主机尾部已脱出盾尾的管片二次注浆封堵或者地面降水措施,保证在盾构机接收过程中端头加固体内部水系与外界处于隔离状态,确保盾构机在接收过程中不发生涌水、涌砂,达到安全接收的目的。
[Abstract]:Because of its high water content, high permeability coefficient and poor forming rate of chemical grouting, This paper makes it more difficult to receive the tunnel by shield tunneling. Taking the construction of the receiving tunnel between Baicang Ridge and Railway Station area of Nanning Rail Transit Line 1 as an example, the concept of "connecting length to make up short" is used. The construction technology of shield short sleeve receiving is put forward innovatively. The receiving length of shield machine is extended by adding short sleeve at the front of door ring plate of tunnel, and the receiving position of shield machine is moved forward. Under the protection of the short sleeve, the shield machine can completely enter the end reinforcement area, combined with the secondary grouting plugging or surface precipitation measures for the segments of the shield machine which have been removed from the tail of the shield machine. In the process of receiving the shield machine, the internal water system of the end and solid is isolated from the outside world, and the water gushing and sand gushing do not occur in the receiving process of the shield machine, so as to achieve the purpose of safe receiving.
【作者单位】： 中铁十六局集团北京轨道交通工程建设有限公司;
【分类号】：U455.43
，

本文编号：1592449