Tunnel second lining micro crack reinforcement method

A technology of micro-cracks and crack directions, applied in tunnel lining, tunnel, shaft lining and other directions, can solve the problems of secondary damage of tunnel lining structure, poor structural durability, low reinforcement strength, etc., and achieve simple, efficient and durable construction Good performance and high reinforcement strength

Inactive Publication Date: 2018-07-24
ROAD & BRIDGE INT +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the construction efficiency of the micro-crack reinforcement method for the second lining of the tunnel is low, the durability of the structure is not good, the reinforcement strength is not high, it is not easy to replace, and it may even cause secondary damage to the tunnel lining structure

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  • Tunnel second lining micro crack reinforcement method
  • Tunnel second lining micro crack reinforcement method
  • Tunnel second lining micro crack reinforcement method

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Embodiment Construction

[0056] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0057] Such as Figure 1~6 , a method for reinforcing micro-cracks in the secondary lining of a tunnel, comprising the following steps:

[0058] Step 1: Base Treatment

[0059] Step 1-1: Crack treatment

[0060] Use a scraper to remove the mortar and dust adhered to the concrete surface of the second lining 2 along the direction of the crack 1, draw out the direction and length of the crack 1, dig a V-shaped groove along the crack, and clean the V-shaped groove with clean water first, and then use high-pressure air blow off;

[0061] Step 1-2: Bury the grouting nozzle

[0062] Embed grouting nozzles 3 at intervals of 15-30cm along the crack direction; each crack shall not be less than two grouting nozzles to ensure the air in the cracks is discharged;

[0063] Steps 1-3: Plugging Water Seepage

[0064] Such as figure 2, for water se...

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Abstract

The invention discloses a tunnel second lining micro crack reinforcement method which is applied in the technical field of tunnel lining reinforcement. The tunnel second lining micro crack reinforcement method includes the steps of substrate treatment, bottom layer construction, uneven correction, underlayer carbon fiber composite material construction and surface layer carbon fiber composite material construction. The problems that a current method for reinforcing a micro crack of a second lining of a tunnel is low in construction efficiency, the structural durability is not good, the reinforcement strength is not high, the replacement is not easy, and even the tunnel lining structure can be subjected to secondary damage. The tunnel second lining micro crack reinforcement method utilizesa resin material, that is, an adhesive resin and a carbon fiber composite material are used together for forming a CFRP. The CFRP is attached to the concrete surface of a cracked second lining, and through the synergistic work of the CFRP and the concrete, the stiffness, yield load and ultimate bearing capacity of a structure are significantly increased. As the carbon fiber composite material hasthe characteristics of corrosion resistance, high strength, light weight and non-magnetic properties, the second lining structure achieves the purpose of crack sealing, high reinforcing strength and good durability.

Description

technical field [0001] The invention belongs to the technical field of tunnel lining reinforcement, and in particular relates to a method for reinforcing micro-cracks in the secondary lining of tunnels. Background technique [0002] The secondary lining of the tunnel, referred to as the secondary lining, is the main project of the tunnel construction, which has the function of bearing the soil pressure around the tunnel and preventing the surrounding rock from collapsing. [0003] In practical engineering applications, there will be cracks in the secondary lining of operating tunnels, which will seriously affect the stability and safety of the tunnel's own structure. There are two main reasons for the cracking of the secondary lining and even the collapse of the tunnel: one is the pressure of the surrounding rock, which acts vertically on the lining due to the natural relaxation of the surrounding rock and cannot bear its own weight. Under normal circumstances, it is easy t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/38
CPCE21D11/003E21D11/38
Inventor 黄道秋李玲玉曹永明卢国兴吕金明张华武
Owner ROAD & BRIDGE INT
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