三视图在削竹式洞门施工放样中的应用

摘要

结合十天高速毛想寨隧道左线削竹式洞门的施工经验，提出了利用三视图指导削竹式洞门施工放样的方法，具体从三视图投影规则的角度对该方法进行了论证，为今后削竹式洞门施工放样积累了经验。%Combining with the construction experience for the left hne bamboo-truncating portal at Maoxiangzhai Tunnel along Shiyan-Tianshui expressway, the paper points out to adopt the orthographic views to direct the construction lofting of the bamboo-truncating portals, and indi- cates the method from the orthographic projection principle, so as to accumulate experience for the construction lofting of the bamboo-trunca- ting portals.