隧道长大管棚预支护施工放样技术——横断面投影法

The Setting-out Technique for the Pre-support Construction of Long and Large Tube Sheds for Tunnels—The Transect Projection Method

长大管棚支护是隧道穿越软弱破碎围岩时的一种预加固施工方法,根据具体的施工放样实例,介绍了横断面投影法放样长大管棚的具体计算方法及操作要点。

The long and large pre-supporting tube shed is an effective method to pre-consolidate the surrounding rock when the tunnel passes through soft or broken surrounding rock in tunnel construction. This paper introduces the calculating method and the important operation points of transect projection, with practical long and large pre-supporting tube sheds as examples.