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近几年来新建的隧道穿越既有隧道和其他建(构)筑物的现象逐年增多,为保护既有建(构)筑物的安全,对新建的隧道工程的施工提出了更高的要求。福建永宁高速公路虹桥隧道浅埋软弱围岩进口段下穿省道公路307线,为保证省道公路307线安全运行和虹桥隧道施工的安全,在虹桥隧道进口段施工过程中采用的大管棚超前支护、省道307线临时改路,以及隧道复合衬砌支护和监控量测等方法,使虹桥隧道顺利下穿省道307线。
In recent years, the number of new tunnels crossing existing tunnels and other structures has been increasing year by year. In order to protect the safety of existing structures, higher requirements have been placed on the construction of new tunnels. Fujian Yongning Expressway Hongqiao tunnel shallow soft surrounding rock entrance section under the provincial highway 307 under the line, in order to ensure the safe operation of Highway Highway 307 and Hongqiao tunnel construction safety, Hongqiao tunnel entrance section of the construction process used in the large shed Ahead of support, the provincial highway 307 lines temporarily change the way, as well as tunnel composite lining support and monitoring measurements and other methods so that Hongqiao tunnel smoothly under the provincial highway 307 line.