High-strength supporting and protection structure of subway tunnel and construction method thereof

Abstract

The invention discloses a high-strength supporting and protection structure of a subway tunnel. The structure includes a cloth bag template, an inner bracing steel rib, an outer bracing steel rib, filling concrete and a pouring stone body, and is characterized in that the cloth bag template is divided into an inner layer and an outer layer, the two ends of the cloth bag template are sealed, and one sealed end is provided with a slurry injection port and a venting hole; a plurality of slurry injecting short pipes communicated with the exterior and the interior are arranged on the cloth bag template, and distributed along the cross section of the cloth bag template in an annular mode; the part, close to the slurry injecting short pipes, of the interior of the cloth bag template is provided with the inner bracing steel rib and the outer bracing steel rib; the filling concrete is the concrete stone body in the cloth bag template; the pouring stone body is the slurry stone body which is incontact with tunnel surrounding rock and positioned outside the cloth bag template. By adopting a method of injecting slurry in the template and outside the template, the intensification problem of aweak broken stratum which a tunnel is about to penetrate though can be solved, the high-strength supporting and protection structure is simple and convenient to construct, the intensification effect of the weak broken stratum can be improved, and the loading capability of a subway tunnel supporting and protection system can be improved.

Description

technical field [0001] The invention relates to the technical field of underground excavation tunnel construction, in particular to a high-strength support structure for a subway tunnel and a construction method thereof, which are mainly applied to reinforcement support for excavation of subway tunnels under weak and broken ground conditions. Background technique [0002] In recent years, domestic infrastructure construction has become more and more vigorous, and more and more cities have begun to build subways to alleviate urban congestion. Many subway lines have to pass through poor geological conditions such as backfill, soft soil, and broken rock formations. The bearing capacity and shear strength of this kind of strata are very low, and the deformation after excavation disturbance is relatively large. Subway construction on this kind of stratum can easily cause large uneven settlement. In addition, the lining of the subway tunnel will undergo creep or rheological defor...

AI Technical Summary

Problems solved by technology

However, this lining structure has its specificity and is only suitable for the prefabricated assembly of shield-tunnel tunnels. It will have problems such as difficult construction and inconvenient transportation when used in the construction of underground excavation tunnels, and the construction accuracy of manual operation cannot meet the requirements.

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