Construction method for excavating water-rich shallow underground excavation tunnel
A shallow buried excavation and construction method technology, which is applied in the direction of tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problem of unfavorable control of tunnel settlement, horizontal convergence, and road settlement, and cannot ensure the safety of tunnel construction and road driving. Tunnel construction safety and other issues, to achieve the effect of improving mechanical utilization, short construction period and high safety
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[0020] See figure 1 with figure 2 , The present invention divides the tunnel into four parts, ①, ②, ③, ④. Among them, parts ① and ② are located in the upper part of the tunnel, part ③ is located in the middle of the tunnel, part ④ is located at the bottom of the tunnel, and parts ① and ② in the upper part of the tunnel are generally bounded by the vertical center line of the tunnel.
[0021] The implementation methods include: 1) Use the steel frame erected in the previous cycle to construct the Φ42 leading small conduit 1 in the 180° range of the tunnel arch and the side wall of the upper pilot pit for advanced grouting support; excavation ①; ①The initial support and temporary support around the pilot pit, that is, the 4cm thick concrete is first sprayed, and the steel mesh is installed to form the initial support steel mesh and sprayed concrete 2. The steel frame and temporary support are erected as the rock surface undulates. Steel frame A, and lock foot anchor pipe 4. Afte...
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