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在双联拱隧道施工中 ,对中隔墙采用分段施工 ,在中隔墙施工一定长度后即由洞口进行正洞开挖 ,正洞采用上、下台阶开挖 ,取消 2个侧导洞施工 ,可缩短隧道施工工期
In the double-arch tunnel construction, the use of sub-wall partition construction, in the construction of a certain length of the wall after the hole is a positive hole excavation, the hole is used to the next step excavation, the abolition of the two side guide tunnel construction , Can shorten the tunnel construction period