A heat self-balancing system and construction method for preventing and controlling freezing damage in tunnels in cold regions

Abstract

The invention discloses a heat self-balancing system for preventing and controlling freezing damage of tunnels in cold regions and a construction method thereof. The system sequentially includes an initial support structure, a waterproof board and a secondary lining structure from the outside to the inside, and the initial support structure is arranged outward. There are several anchor rods, superconducting heat pipes and heat collection devices. The superconducting heat pipes are connected by three-way or double-way joints. The adjacent three-way joints are connected by superconducting heat pipes. superconducting materials. The invention adds a heat self-balancing system on the basis of the tunnel structure, and fills superconducting heat pipes, three-way joints and double-way joints with superconducting heat-conducting materials, so that the heat in the high-temperature zone of the tunnel is directed to the low-temperature frost-damaged areas such as the tunnel entrance , not only solves the problem of heat dissipation in the high temperature zone of the tunnel, but also solves the problem of freezing damage in the low temperature zone of the tunnel, and has moderate cost, simple construction and convenient maintenance.

Description

technical field [0001] The invention belongs to the technical field of tunnels, and in particular relates to a heat self-balancing system for preventing and controlling freezing damage of tunnels in cold regions and a construction method thereof. Background technique [0002] my country has a vast territory, with large climate differences in different regions, and a wide range of seasonal permafrost areas. The freezing and thawing cycle under cold and low temperature makes the tunnel engineering in these areas prone to different degrees of freezing damage. In tunnel engineering, construction or loading reasons may cause shrinkage cracks or load cracks inside the concrete structure, especially near the surface. Once the fissure water or pore water in the surrounding rock and soil gradually invades these cracks in the lining, and freezes and expands at low temperature in winter, causing the cracks to expand further, it is easy to cause freezing damage such as lining cracking,...

AI Technical Summary

Problems solved by technology

In addition, freezing damage often occurs at the entrance of the tunnel, and in the middle of the tunnel where the buried depth is large, the temperature in the lining and the tunnel is too high due to geothermal heat, which requires a lot of manpower and material resources to dissipate heat

[0003] At present, there are two main control measures for the phenomenon of freezing damage in tunnels in cold regions. One is to embed heat sources such as cables in the tunnel lining to actively heat the surface of the tunnel lining. Although this method is simple and direct, but It requires a lot of electricity and maintenance costs, and there is also a fire hazard; the other is to heat insulation by placing a thermal insulation layer in the lining decorative layer. This method is passive insulation, which is not effective and expensive

The heat dissipation measures for the tunnel section with a large buried depth are mainly to actively dissipate heat through the axial flow fan to cause air flow. This method also requires a lot of power and maintenance costs, and the thermal conductivity of the air is poor, which leads to the unsatisfactory heat dissipation effect of this method.

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