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宝兰客专中川隧道近距离下穿天巉公路,隧道顶距离公路路面仅有6.07m,而隧道开挖宽度达到15.02m。在如此大断面、小净距情况下进行隧道开挖,必须采取可靠措施既要保证新建铁路隧道施工安全,又要使公路保持运营状态,不产生较大的沉降。工程采用大管棚超前支护、简易栈桥等措施保证了施工安全,对类似工程有借鉴意义。
Baolan Passenger Specialist Nakagawa tunnel near Tianzhu under the highway, the tunnel from the top of the road only 6.07m, while the tunnel width of 15.02m. In such large cross-section and small clear distance tunnel excavation, we must take reliable measures not only to ensure the safety of new railway tunnel construction, but also to keep the highway operating conditions, does not produce a large settlement. The project adopts the advanced support of large pipe shed, simple trestle and other measures to ensure the construction safety and have reference significance for similar projects.