Method for repairing rock stratum shield subway tunnel after accidental breakdown

A rock layer and tunnel technology, which is applied in the field of repair after accidental breakdown of subway shield tunnels, can solve the problems of structural strength, low reinforcement ratio of segments, and hidden safety hazards, so as to achieve light backfill materials and ensure stress safety Effect

Active Publication Date: 2021-11-05
ROAD & BRIDGE INT +1
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Problems solved by technology

Generally, grouting, water-stopping and steel lining are used for repair in the tunnel, but because the installation of the steel lining requires the temporary removal of pipelines, evacuation platforms, and even catenary supports in the tunnel, it has a great impact on the operation of the subway; moreover, subway tunnels usually The shield method is used for construction, and reinforced concrete segments are installed on the inner wall of the tunnel. When they are accidentally broken down, the main steel bars of the segment are often cut off, especially for tunnels in rock formations. Due to the better strength and stability of the stratum itself, the segmental reinforcement The rate is generally low, and the structural strength after being broken down will be greatly affected. There are safety hazards in the simple repair method in the hole, and the maintenance cost in the later period is very high.

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  • Method for repairing rock stratum shield subway tunnel after accidental breakdown

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Embodiment Construction

[0014] The invention is applicable to the outside repair method of the shield tunnel under the geological condition of the rock strata. By excavating the vertical shaft, the damage condition of the broken down position of the segments can be fully detected, so that effective repair measures can be taken. Considering that the shaft backfilling material will cause greater pressure on the tunnel segment, which is not conducive to maintaining the structural strength of the segment, the rock formation can be fully utilized to bear the weight of the backfilling material to reduce the pressure of backfilling on the segment. The specific construction method is as follows:

[0015] (1) if figure 1 As shown, the ground point corresponding to the breakdown point 2 of the tunnel 1 is first determined by measurement, and the dewatering well 3 is built on both sides of the ground point for precipitation, so as to prevent water leakage at the breakdown point and create a safe environment for...

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Abstract

The invention relates to a method for repairing a rock stratum shield subway tunnel after accidental breakdown. The method adopts a mode of combining a dewatering well and a vertical shaft, the vertical shaft is excavated outside a tunnel to a breakdown point, rebars and concrete of tunnel segments are repaired, the repairing effect is good, and the influence on subway operation in the tunnel can be minimized. The inner diameter of the part, in the upper soil layer, of the vertical shaft is larger than that of the part in the lower rock layer, a backfill material is made of foam lightweight concrete, it is guaranteed that the whole backfill material is light, most gravity can be dispersed into the rock layer, the backfill material is prevented from generating too large pressure to the tunnel segments, and therefore the stress safety of the segment structures is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of subway tunnel construction, and in particular relates to a repair method for a subway shield tunnel accidentally broken down. Background technique [0002] The buried depth of urban subway tunnels is generally between 10-30m. During pipeline laying and building construction along the subway line, sometimes the tunnel will be accidentally broken down due to measurement or operation errors, resulting in water penetration accidents in the tunnel. It is necessary to repair the broken down parts as soon as possible. repair. Generally, grouting, water-stopping and steel lining are used for repair in the tunnel, but because the installation of the steel lining requires the temporary removal of pipelines, evacuation platforms, and even catenary supports in the tunnel, it has a great impact on the operation of the subway; moreover, subway tunnels usually The shield method is used for construction, and reinforced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/08E21D11/10E21D11/38E21F15/00E21D8/00
CPCE21D11/08E21D11/10E21D11/38E21F15/005E21D8/00Y02E10/20
Inventor 韦生达张文建周勋李涛孟俊楠王澄峰万栋来吕红达
Owner ROAD & BRIDGE INT
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