A prefabricated lining for tunnel reinforcement and its installation method

Abstract

The invention relates to a prefabricated lining for tunnel reinforcement and an installation method thereof. The prefabricated lining is installed inside the original lining of the tunnel, including the left and right prefabricated linings with arc-shaped cross-sections. The left and right prefabricated linings are symmetrical about the central axis of the tunnel and docked at the top of the tunnel. The distance between the prefabricated lining and the original tunnel lining is The grouting layer, the left and right prefabricated linings are composed of several sub-linings with the same width. The sub-linings are arranged along the tunnel extension direction and connected with each other. It is a trapezoidal structure and is located in the middle of the top of each sub-lining. Each toothed joint is axially opened with bolt holes for bolt connection. The thickness of the prefabricated lining is H=ΔD min -T. During the construction process of the present invention, only the corresponding lanes need to be closed, without affecting the normal passage of other lanes. The installation process is quick and easy, without pouring or spraying concrete, and without slotting in the original structure, which can greatly reduce the difficulty and time of reinforcement construction.

Description

technical field [0001] The invention relates to the field of tunnel reinforcement and repair construction, in particular to a prefabricated lining for tunnel reinforcement and an installation method thereof. Background technique [0002] In the field of tunnel reinforcement and repair construction, the existing tunnel reinforcement technology mainly uses ribbed steel bars, anchor rods, steel mesh, and shotcrete to form a "circular reinforcement structure" to reinforce the cracked lining. The basic steps are as follows: [0003] 1) Close the tunnel and clean up the decorative layer, oil stains and floating dust impurities on the lining surface; [0004] 2) Judgment of headroom: According to the measurement data and limit size of the headroom section, for the part with insufficient headroom, the lining shall be properly chiseled to ensure that the sprayed concrete does not invade the limit after covering; [0005] 3) Construction of bolts: according to the design spacing, set...

AI Technical Summary

Problems solved by technology

[0015] The main disadvantages of the above-mentioned construction methods are: during the construction process, the tunnel must be closed to block the passage of vehicles, the construction steps are cumbersome and the cycle is long, which seriously affects the normal operation of the tunnel

During the construction process, whether it is the process of slotting or the process of pouring and curing concrete, it takes a long time, resulting in a long construction period and long-term impact on traffic

After installing the steel arch, it is necessary to fill the grid formed by the arch with shotcrete, which further increases the difficulty and time of construction

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