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Construction method of high-strength shield tunnel reinforced structure

A technology for shield tunneling and reinforcement structures, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve problems such as insufficient strength performance and failure of reinforced structure strength, and achieve simple and efficient construction, easy replacement, and strong anti-corrosion capabilities. Effect

Inactive Publication Date: 2020-08-14
NANJING METRO GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the structure has good toughness, it has insufficient strength due to the presence of only resin and aramid fiber in the structure, and the reinforced structure after construction has the risk of strength failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The construction method of the high-strength shield tunnel reinforcement structure of the present invention comprises the following steps:

[0031] S1: Find out the parts to be reinforced with cracks on the inner wall of the shield tunnel, clean up the cracks first, and then clean the concrete surface around the cracks, use a scraper to shovel off the mortar and dust attached to the concrete surface along the direction of the cracks, and draw out Then dig a V-shaped groove along the crack, and blow the V-shaped groove with high-pressure air first, and then wash it with clean water; if there is a water seepage crack, pour a plugging agent into the crack until the crack no longer seeps. For non-permeable cracks, skip this step. During specific implementation, the leak-stopping agent is a water-based polyurethane leak-stopping agent.

[0032] S2: Epoxy resin is applied to the cleaned crack and the unevenness on the surrounding concrete surface to make the crack and the su...

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Abstract

The invention relates to a construction method of a high-strength shield tunnel reinforced structure. The construction method comprises the following steps that S1, a to-be-reinforced part with a crack in the inner wall of a shield tunnel is found; S2, a cleaned crack and an uneven part of the surrounding concrete surface are coated with epoxy resin; S3, a nut of a chemical bolt is fixedly buriedon the surface of concrete; S4, the surface of the concrete is coated with epoxy resin to form an epoxy resin layer, and then HFRP grid-ECC composite reinforcing plates are spliced one by one on the surface of the coated epoxy resin layer to form an HFRP grid-ECC composite reinforcing layer on the inner wall surface of the shield tunnel. Compared with the prior art, the construction method combines the performance advantages of CFPR fiber and GFRP fiber, fully combines the advantages of high strength, light weight, corrosion resistance and the like of the CFPR and the high ductility of the GFRP fiber, whole HFRP mesh fabric is obtained through circular looming, so that after being applied to an internal structure of the shield tunnel, the mechanical property of the cloth is significantly stronger than that of aramid fiber-resin material.

Description

technical field [0001] The invention relates to the technical field of structural reinforcement in the field of tunnel engineering, in particular to a construction method for a reinforced structure of a high-strength shield tunnel. Background technique [0002] Due to the increasing pressure of urban traffic, urban rail transit has developed rapidly in recent years. Shield tunnels are widely used in the construction of subway tunnels due to their advantages of fast construction speed, reasonable structural stress form, and increasingly mature construction technology. [0003] The prefabricated lining is transported into the tunnel by a number of components prefabricated in the factory or on site, and assembled by machinery. Once assembled, it can withstand the pressure of the surrounding rock. During the long-term use, due to ground overload, bolt corrosion, structural aging and other reasons, the deformation of the lining exceeds the limit, which not only aggravates the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/08E21D11/38B28B1/14B28B1/52C04B28/00
CPCB28B1/14B28B1/52C04B28/00E21D11/08E21D11/38E21D11/086C04B14/06C04B14/02
Inventor 张伯林郑军沈晓伟
Owner NANJING METRO GRP
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