Construction method for weak surrounding rock section of short-step super-large-section tunnel
A technology with super-large cross-section and weak surrounding rock, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of increased difficulty in tunnel construction and construction difficulties, and achieve the reduction of vault sinking, the convenience of mechanized construction, and the construction space Increased effect
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[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings, but the described embodiments are only part of the embodiments of the present invention, not all embodiments, and the scope of protection of the present invention is not limited to this.
[0026] This embodiment is V-level surrounding rock, and the initial support adopts I22 steel frame with a spacing of 0.5m; φ50 grouting lock-foot anchor pipes, 12 in each ring; φ50 advanced anchor pipes, with a circumferential spacing of 40cm.
[0027] The present invention provides a construction method for the weak surrounding rock section of a super-large cross-section tunnel with short steps. The excavation method is as follows, and the construction sequence of each working face is detailed in figure 1 ;
[0028] S1: Excavate the arc-shaped pilot pit at the top 1: The arc-shaped pilot pit 1 at the top is excavated mechan...
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