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A kind of tunnel cracked secondary lining reinforcement method and device based on sprayed cement-based composite material

A composite material and cement-based technology, which is applied in the direction of tunnel lining, tunnel, shaft equipment, etc., can solve problems such as repeated cracking, and achieve the effects of good deformation ability, excellent working performance and high toughness

Active Publication Date: 2022-07-12
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Utilize sprayable high-toughness, anti-seepage and low shrinkage cement-based composite materials to replace traditional concrete materials for tunnel cracked secondary lining reinforcement, fundamentally solve the cracking of tunnel lining and repeated cracking after reinforcement with ordinary concrete In addition, a new type of mixing and spraying construction integrated device was invented for the application of high toughness cement-based composite material spraying reinforcement, and a detachable stainless steel screen was attached to ensure the uniformity of aggregate particle size, solving the problem of high toughness, Problems of anti-seepage and low shrinkage cement-based materials in the construction process of mixing and spraying construction and improving construction efficiency

Method used

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  • A kind of tunnel cracked secondary lining reinforcement method and device based on sprayed cement-based composite material
  • A kind of tunnel cracked secondary lining reinforcement method and device based on sprayed cement-based composite material
  • A kind of tunnel cracked secondary lining reinforcement method and device based on sprayed cement-based composite material

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Embodiment 1

[0033] Example 1, as figure 2 As shown: under the action of the surrounding rock compressive stress, the ordinary concrete lining has cracks due to insufficient toughness, ductility and self-shrinkage, or the tunnel lining has repeated cracks. The cement-based composite material of the present invention is used to repair the cracks in the secondary lining of the tunnel. The bearing capacity of the lining is calculated to obtain the minimum thickness of the secondary lining that can be removed along the direction of crack propagation without disturbing the stability and bearing capacity of the original lining structure. 2 , At the same time, it should be ensured that the thickness of the chisel is less than 3.5C, and the debris should be cleaned up in time. At the same time, the surface of the original secondary lining is inclined drilling. Preferably, the drillings are arranged in a grid of 10 × 10 cm, and the depth is 2 cm, and the horizontal direction is 30 °. After the dri...

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Abstract

The invention discloses a method and a device for reinforcing a cracked secondary lining of a tunnel based on a spray-type cement-based composite material, belonging to the technical field of underground engineering. The present invention carries out the pretreatment of reinforcement technology for the cracked secondary lining of the tunnel and the reinforcement spraying construction for the secondary lining of the cracked tunnel. The treated surface of the secondary lining of the tunnel is subjected to inclined drilling treatment; then, drill holes again on the surface of the secondary lining of the tunnel after chiseling treatment and lay high-strength anchoring steel nails in it; finally, the cement-based composite material is sprayed onto the treated secondary lining of the tunnel. Reinforce the lining surface. The reinforcement method has little disturbance to the original structure, ensures the stability, safety and durability of the structure, reduces the impact on the operation of the tunnel, and ensures the integrity of the tunnel lining. The use of an integrated device for stirring and spraying construction with screening function can improve construction efficiency and ensure that the freshly mixed mixture has good working performance.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a method and a device for reinforcing a cracked secondary lining of a tunnel based on a spray-type cement-based composite material. Background technique [0002] Concrete is widely used in tunnel engineering due to its wide access to raw materials, simple preparation process and high strength. However, ordinary concrete is a brittle material with extremely poor toughness and ductility, and the ultimate tensile strain is about 0.01%; although the importance of controlling the crack width has gradually attracted attention in the durability of infrastructure, it is not widely used in the design of concrete. Not enough attention has been paid. When the tensile strain of ordinary concrete is about 0.01%, the width of local cracks has exceeded 0.6mm, which seriously affects the bearing capacity and durability of the structure. [0003] Due to the low toughn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10C04B28/04
CPCE21D11/10E21D11/105C04B28/04C04B2111/00155C04B2111/00724C04B2201/50C04B18/08C04B18/141C04B16/0641C04B2103/302
Inventor 李晓琴周旭丁祖德李菁
Owner KUNMING UNIV OF SCI & TECH
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