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Reinforcement protection method for inner surface of tunnel

An in-tunnel, reinforcement technology, applied in tunnels, tunnel linings, earth-moving drilling, etc., can solve problems such as cracks, water seepage, high temperature, and bursting.

Inactive Publication Date: 2006-02-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a reinforcement and protection method for the inner surface of the tunnel to improve the surface strength of the inner surface of the tunnel and solve the problems of cracks, water seepage and high-temperature bursting on the inner surface of the tunnel

Method used

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  • Reinforcement protection method for inner surface of tunnel
  • Reinforcement protection method for inner surface of tunnel

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specific Embodiment approach 1

[0005] Specific embodiment one: this embodiment is realized by the following steps: 1. prepare cement waterproof mortar, cement waterproof mortar is fully mixed by the following components of weight ratio, cement: sand: water: polyacrylic acid emulsion=1: 0.5~0.7 : 0.4~0.6: 0.005~0.008; 2. According to the weight ratio of cement waterproof mortar: polypropylene fiber = 1: 0.006~0.008, fully mix polypropylene fiber in cement waterproof mortar to make modified cement mortar, polypropylene fiber The length of the fiber is 6-15 mm, and the diameter of the polypropylene fiber is 5-10 microns; 3. Spray the modified cement mortar on the inner surface of the tunnel of the concrete structure, and wait until the modified cement mortar solidifies to complete the inner surface of the tunnel. Strengthen protection work. The cement is selected from P.032.5 type products, and the sand is selected from medium sand with a particle size of less than 4.75 mm and a fineness modulus of 2.4 to 2.9....

specific Embodiment approach 2

[0006] Specific embodiment two: below in conjunction with Fig. 1 and figure 2 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 is that the following steps are also included before step 1: covering and fixing the grid net 2 on the inner surface 1 of the tunnel, the grid grid net 2 is made of carbon fiber and epoxy Made of resin composite material. Other steps are the same as those in Embodiment 1. The grid-shaped grid net 2 is equivalent to the skeleton of the modified cement mortar, which improves the strength of the protective layer formed by the modified cement mortar after solidification. In addition, the electrical equipment in the subway system will generate stray currents during operation, and the stray currents will cause serious electrochemical corrosion to the steel bars of the main structure in the tunnel and various metal pipe networks within a certain range, causing certain harm. The present invention covers...

specific Embodiment approach 3

[0007] Specific embodiment three: the difference between this embodiment and embodiment two is: grid net 2 is made up of the component that volume ratio is carbon fiber: epoxy resin=30~35:100, and epoxy resin is used as base material, and carbon fiber is fully Mixed and cured in epoxy resin to form grid mesh 2. The carbon fiber can be selected from Japan Toray's T700 model product or the same domestic carbon fiber, and the epoxy resin can be selected from the product of the E54 model. The mesh size of the grid net 2 is B×C=100 mm×100 mm, and it can also be designed according to specific needs. Other steps are the same as the second embodiment.

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Abstract

The inner tunnel surface reinforcing and protecting method includes adding polyacrylic emulsion and polyacrylic fiber into waterproof cement mortar to raise the surface strength of inner tunnel surface and to prevent crack, water permeation and high temperature blowout. The method includes the first compounding waterproof cement mortar with cement, sand, water and polyacrylic emulsion in the ratio of 1 to 0.5-0.7 to 0.4-0.6 to 0.005-0.008; the subsequent mixing polyacrylic fiber in the amount of 0.006-0.008 of cement mortar weight with cement mortar to form modified cement mortar; and final spraying the modified cement mortar to the inner surface of the concrete structure. The polyacrylic fiber resists the stresses of cement shrinking in different directions to raise the strength of solidified waterproof mortar and raise the fireproof limit. In addition, the grille net has crack resisting reinforcing effect.

Description

Technical field: [0001] The invention relates to a method for reinforcing and protecting the inner surface of a tunnel. Background technique: [0002] At present, the tunnels used for driving vehicles are basically reinforced concrete structures, but with the extension of the service life of this structure, micro-cracks and water seepage often appear on the inner surface of the tunnel. Corrosion hazards caused by facilities and equipment also shorten the service life of the tunnel and make it difficult for vehicles to pass. As a symbol of a modern city, the subway brings great convenience to the travel of urban residents. However, there are still no effective solutions to the phenomenon of micro-cracks and water seepage on the inner surface of the subway tunnel. In addition, the concrete on the inner surface of the tunnel is prone to bursting in a high-temperature environment. If a fire occurs in the tunnel, it will cause large-scale damage to the wall. Invention content:...

Claims

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Application Information

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IPC IPC(8): E21D11/00C04B26/02E21D11/38E04B1/62E04G23/02
Inventor 黄龙男李地红赵亚丁袁杰张东兴顾大明
Owner HARBIN INST OF TECH
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