三台阶七步法开挖大断面隧道控制要点

The control key points of three steps seven footwork excavation of ling large section tunnel

介绍了采用三台阶七步开挖法进行隧道施工的技术特点,以某隧道施工为例说明了洞体开挖中的各工序要点,重点在于初期支护尽快闭合成环,及时跟进仰拱和拱墙衬砌,强调了确保施工质量的控制要点,以确保洞体施工质量和安全。

This paper introduced the technical characteristics using three steps seven footwork excavation method to tunnel construction,taking a tunnel construction as an example,explained the key points of each process,center on the initial support closed as soon as possible,and the inverted arch and arch wall lining followed up in time,emphasized the key points of ensuring the construction quality,so as to ensure the tunnel construction quality and safety.