Tunnel secondary lining crack finishing and reinforcing method

Abstract

The invention discloses a tunnel secondary lining crack finishing and reinforcing method. The tunnel secondary lining crack finishing and reinforcing method comprises the following steps: S1, anchor hole positions are marked on the two sides of cracks in the trend of the cracks; S2, anchor holes are drilled in the anchor hole positions; S3, aggregate chips in the anchor holes are cleared through high-pressure gas; S4, slotting sidelines are drawn along the edge position of anchor backing plates, and reinforcing holes are cut out along the slotting sidelines; S5, the ends, provided with expansion sleeves, of hollow anchor rods are stuffed into the anchor holes, and by rotating the hollow anchor rods, the expansion sleeves on the outer sides of the ends of the hollow anchor rods are expandedto tightly support the inner side walls of the anchor holes; S6, stop-grouting plugs sleeve the outer sides of the hollow anchor rods, and the hollow anchor rods and the cracks are grouted; S7, afterslurry is solidified, a ventilating pipe exposed on the outer side of the slurry is cut off, and the anchor backing plates sleeve the outer sides of the hollow anchor rods; S8, fastening nuts sleevethe ends of the outer sides of the hollow anchor rods and are welded; S9, reinforcing meshes are welded; S10, the reinforcing holes are backfilled; and S11, ultrasonic non-destructive testing is conducted.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for repairing and reinforcing cracks in secondary lining of tunnels. Background technique [0002] In recent years, with the continuous increase of the scale of highway and railway tunnels in our country, the diseases of tunnel lining structures during operation have become more and more prominent. According to the statistical data of 5000 tunnel surveys, 1 / 3 of the tunnels have lining structure cracks and water leakage. Such situations will bring great hidden dangers to the long-term safe operation of the tunnel. The problem of tunnel lining crack reinforcement has always been the focus of tunnel engineering research. How to design a corresponding reinforcement method for tunnel secondary lining cracks is an urgent problem to be solved. Therefore, it is of great practical significance to explore a reinforcement technology for tunnel lining cracks. Contents of the i...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the continuous increase of the scale of highway and railway tunnels in our country, the diseases of tunnel lining structures during operation have become more and more prominent. According to the statistical data of 5000 tunnel surveys, 1 / 3 of the tunnels have lining structure cracks and water leakage. etc., which will bring great hidden dangers to the long-term safe operation of the tunnel.

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