Buried closed tunnel

Abstract

The invention discloses a buried closed tunnel. The buried closed tunnel comprises a tunnel body, the tunnel body is of a tunnel structure defined by a cast-in-place waterproof concrete top plate, a cast-in-place waterproof concrete left side wall, a cast-in-place waterproof concrete bottom plate and a cast-in-place waterproof concrete right side wall, and the tunnel body is divided into two channels by a middle partition wall; the surface of the cast-in-place waterproof concrete top plate of the tunnel body is sequentially paved with a waterproof coating layer, a root system puncture resisting layer, a PE film, a pebble concrete protection layer and a layered backfill compacted soil layer from bottom to top. According to the buried closed tunnel, due to the fact that the root system puncture resisting layer and the PE film are additionally arranged on the cast-in-place waterproof concrete top plate of the tunnel body, damage of roots to a waterproof layer can be effectively prevented, a good waterproof effect is achieved, the phenomenon of water seepage in the tunnel is avoided, and operation safety and the service life of the subway tunnel are guaranteed. Due to the fact that the deformation joint of the tunnel body is subjected to waterproof treatment, the phenomenon that water seeps into the tunnel body from the deformation joint is avoided.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a buried closed tunnel. Background technique [0002] With the continuous development of urban underground space and the gradual completion and operation of subway tunnels, more and more trees will inevitably appear above the existing subway tunnels. The roots of trees grow downward and easily penetrate the waterproof layer, causing the waterproof layer to fail. Therefore, there will be water seepage in the tunnel, which will seriously affect the operation safety and service life of the subway tunnel. [0003] In addition, the post-maintenance and treatment of tunnel deformation joints currently mainly adopt methods such as grouting on the facing surface, grouting inside deformation joints, and the use of built-in sealing waterstops. The early effect of the above means can be seen, but the waterproof ability in the later period is only completely dependent on the quality of the...

AI Technical Summary

Problems solved by technology

The early effect of the above means can be seen, but the waterproof ability in the later period is only completely dependent on the quality of the material and the construction quality to provide the waterproof effect, and the instability is relatively large; for the later maintenance, the embedded filling material can only meet the deformation and extrusion, and cannot provide waterproof fortification. In the end, the pressure of the main waterproof layer is too large, and the seal is not tight, resulting in the problem of leakage.

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