Active drainage anti-floating segment and lining structure

Abstract

The invention belongs to the field of building construction, and particularly relates to an active drainage anti-floating segment and a lining structure. A main structure of the active drainage anti-floating segment comprises a segment body, a drainage pipe, drainage holes, a grouting hole, corner blocks, a water stop strip, anti-collision strips, a curved side end surface and a rectangular side end surface; through the active drainage holes, after slurry is hardened, the excess slurry existing between the segment and surrounding rock is bled and drained out, and then grouting is carried out again through the grouting hole until the position, between the segment and the surrounding rock, is all filled with hardened concrete, the filling rate of the slurry is improved, and the phenomenon that only the upper part of the segment is filled with water due to the shrinkage of the hardened volume of the slurry is eliminated, the anti-floating ability of the segment is greatly increased, through the triangular corner blocks composed of reinforced concrete, the contact between the segment and the surrounding rock is more tight, action points of the triangle corner blocks on both sides of the segment transfer to the depth of the surrounding rock to form a stress arch, and the segment is effectively prevented from floating up.

Description

Technical field: [0001] The invention belongs to the field of building construction, and in particular relates to an active drainage anti-floating segment and a lining structure. Background technique: [0002] Segment is a prefabricated arc-shaped structure used to support surrounding rock in shield tunneling and TBM (full-face tunnel boring machine). It is usually formed by binding steel bars and then poured high-strength impermeable concrete at one time. As the main assembly component of the tunnel construction, the segment is the main support structure of the tunnel, which bears the earth pressure, water pressure and some special loads brought by the surrounding rock. The lining structure is assembled by multi-ring segments along the longitudinal direction of the tunnel. The segments are connected by bolts. The inner and outer surfaces of the segments are smooth arc-shaped surfaces. There are grouting holes, positioning holes and connection holes. After the segment is a...

AI Technical Summary

Problems solved by technology

[0003] At present, in actual tunnel construction, the initial setting time of concrete after grouting is basically more than 6 hours. During the concrete setting process, the mortar sinks along the periphery of the segment, resulting in dense mortar in the lower part, while only clear water remains in the upper part. The lower part of the slice is closely connected with the surrounding rock, while the upper part is filled with water, and the secondary grout cannot be injected in, which eventually makes the upper part unable to effectively transmit stress, resulting in serious floating phenomenon of the segment in the tunnel

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