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铁路隧道上下导坑开挖方向,若掌握不好,发生较大偏差,甚至超出整个隧道开挖轮廓线外,就会造成重大损失。就是不超出开挖轮廓线,也会给施工造成一些困难,如漏斗孔不能打在正确位置,拱脚悬空等。因此,这项工作在隧道施工中是不可忽视的。经常用仪器测量,能保证导坑开挖方向不发生较大偏差。然而测量频繁,确又影响进度,
If the direction of excavation of the upper and lower guide rails of the railway tunnel is not well controlled, great deviation will occur even beyond the contour of the entire tunnel excavation, which will cause heavy losses. Is not beyond the outline of excavation, construction will also cause some difficulties, such as the funnel hole can not hit the correct position, such as vacant arch feet. Therefore, this work can not be ignored in the construction of the tunnel. Often measured with the instrument, to ensure that the direction of pit excavation deviation does not occur. However, frequent measurements do affect the progress,