Thermal-insulation anti-freezing structure for high-speed railway tunnel in severe cold area

Abstract

The invention discloses a thermal-insulation anti-freezing structure for a high-speed railway tunnel in a severe cold area. The thermal-insulation anti-freezing structure comprises a primary support,corrugated steel pipes, a lightweight concrete layer, a waterproof layer, a secondary lining and a thermal-insulation board; the primary support is formed by spraying concrete on the surface of surrounding rock of an excavated tunnel and solidifying the concrete; the corrugated steel pipes are concavely folded into semicircles and are consistent with the cross section of the primary support in shape; the corrugated steel pipes are tightly attached to the inner wall of the primary support and are arranged in parallel in the longitudinal direction of the tunnel; and the two ends of each corrugated steel pipe are located at the bottoms of the left side and the right side of the tunnel; the lightweight concrete layer is formed by spraying lightweight concrete on the inner wall of each corrugated steel pipe and solidifying the lightweight concrete; the waterproof layer is paved and covered on the inner wall surface of the lightweight concrete layer; the secondary lining is constructed on the inner wall of the waterproof layer and is tightly attached to the waterproof layer; and the thermal-insulation board is arranged and covers the inner wall surface of the secondary lining. The thermal-insulation anti-freezing structure can reduce and relieve frost heaving deformation of surrounding rocks and secondary linings and has a thermal-insulation effect; and the influence on traffic safety due to falling of the thermal-insulation board and the tunnel structure can be prevented.

Description

【Technical field】 [0001] The invention belongs to the technical field of heat preservation and antifreeze damage of tunnel engineering in cold regions, and in particular relates to a heat preservation and antifreeze structure for high-speed railway tunnels in severe cold regions. 【Background technique】 [0002] Due to the intrusion of cold air in winter, high-speed railway tunnels in high-altitude and severe cold areas may cause frost damage to the tunnel structure and surrounding surrounding rocks, such as frost heave spalling and cracks in the tunnel lining, partial or overall collapse of the tunnel arch and side walls; freeze-thaw Under the cycle, the structure leaks water, and even produces water gushing. In order to effectively prevent freezing of tunnels in cold regions, thermal insulation and antifreezing treatment must be carried out on the tunnel structure. According to actual engineering experience, simple waterproof and drainage technology can no longer meet the a...

AI Technical Summary

Problems solved by technology

These two insulation methods can theoretically achieve the effect of insulation, and then solve the problem of frost heave disasters in tunnels in cold regions, but both laying methods have certain defects

The train wind in the high-speed railway tunnel is strong. During the operation of the tunnel, the insulation board laid on the surface of the secondary lining will loosen or even fall off under the action of the train wind, which will affect the normal running of the train; and when the insulation board is laid on the secondary lining and waterproof layer or between the secondary lining and the primary lining, the moisture in the surrounding rock will gather near the insulation board and seep into the insulation board, which not only affects the insulation effect of the insulation board, but also the accumulated moisture freezes in winter and can also Frost heaving and cracking of the lining structure

[0004] Therefore, there is a need for a high-speed railway tunnel thermal insulation and antifreeze structure in severe cold areas to solve the above problems, which can effectively prevent the thermal insulation board from falling off and affect driving safety, and can also ensure the thermal insulation and anti-frost heave effect

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