论文部分内容阅读
在一般隧道施工中,以往多根据石质硬度采用上下导坑先拱后墙法及漏斗棚架先墙后拱法。这两种方法都具有变更施工方法较困难的缺点,上下导坑法工序间干扰大、费工费料。在中等硬度岩层中寻找一个合适的可以加快施工进度的施工方法,是一次十分迫切的任务,广大职工、民兵在××、××、××等线隧道施工中,不断创造改进,使用和推广了蘑菇形开挖法,取得了初步的成功。一、施工方法及技术要求 1.蘑菇形开挖法是在下导坑领先掘进的条件下,将中层、及弧形扩大部分由下而上的
In the general construction of the tunnel, in the past mostly based on the hardness of stone up and down using the first post-arch pit wall method and funnel scaffolding wall after the arch method. Both of these methods have the disadvantage of changing the construction method more difficult. The interference between the upper and lower pilot pit processes is large and the work expense is high. It is a very urgent task to find a suitable construction method to speed up the construction progress in medium hardness rock formations. The majority of workers and militiamen constantly improve, use and popularize in tunnel construction such as ××, ×× and ×× The mushroom-shaped excavation method, has achieved initial success. First, the construction methods and technical requirements 1. Mushroom-shaped excavation method is in the lead under the heading of heading conditions, the middle, and arc-shaped part of the bottom-up