Soft rock four-line large-span tunnel compound double-side wall bracing cable conversion excavation construction method
A construction method and double-side wall technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as easy deformation of surrounding rock, difficult excavation construction methods, unstable construction operations, etc.
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0015] refer to figure 1 , figure 2 and Figure 15 , The construction method of the conversion excavation of the soft rock fourth-line long-span tunnel with the composite double-side wall braces, including the following steps:
[0016] ① Excavate the guide holes 1 on the side walls on both sides, apply corresponding advanced support before excavation, and apply corresponding initial support and temporary support immediately after excavation;
[0017] ②Irrigation of the pedestal foundation II on both sides;
[0018] ③ Excavate the side pilot holes 3 and 4 of the arch on both sides respectively. Before excavation, apply corresponding advanced support. Immediately after excavation, apply corresponding initial support and temporary support, and put on the top of the corresponding initial support. The lower end of the corresponding initial support is su...
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