摘要
铁路大断面隧道三台阶七步开挖法是以弧形导坑开挖留核心土为基本模式,分上、中、下三个台阶七个开挖面,各部位的开挖与支护沿隧道纵向错开、平行推进。主要特点是施工空间大,方便机械化施工,可以多作业面平行作业,适用于采用机械开挖配合弱爆破松动的Ⅳ、Ⅴ级软弱围岩。三台阶七步法,由于隧道中部预留有核心土,大型机械设备能从下台阶直接到上台阶掌子面,可以节约大量劳力,加快作业速度,已作为隧道软弱围岩施工的一种成熟工法在铁路系统内推广,但因为其施工步骤繁多,工序之间干扰较大,施工组织起来麻烦,一些施工单位不易接收,而隧道施工,特别是软弱围岩,一定要树立不塌方就是胜利的理念,千万不可冒进,要以掌子面掘进为龙头,抓工序、抓作业循环时间,科学组织,均衡生产。三台阶七步法,只要组织得当,措施有力,在大断面软弱围岩隧道施工中比较实用,本文目的就是通过个人从事隧道施工的体会,给隧道界同行以参考。
Railway large-section tunnel excavation method is based on three seven-step curved stairs lead to remain the core of earth excavation pit for the basic model,sub-upper,middle and the next three steps 7 excavation face,the various parts of the excavation and support care along the tunnel longitudinal staggered,parallel advance.Main features of the construction of a large space,to facilitate mechanized construction,multi-operating surface parallel operations can be applied to the weak mechanical excavation with blasting loose Ⅳ,Ⅴ grade soft rock.
出处
《科技创新导报》
2010年第13期122-122,124,共2页
Science and Technology Innovation Herald
关键词
隧道
大断面
三台阶七步法
软弱围岩
Three-step seven-step method
Tunnel
Large-section
Weak rock
