Self-heat-preservation anti-freezing lining structure for traffic tunnel in seasonally frozen soil area

Abstract

The invention belongs to the technical field of anti-freezing heat preservation of tunnels in cold areas, and discloses a self-heat-preservation anti-freezing lining structure for a traffic tunnel in a seasonally frozen soil area; the self-heat-preservation anti-freezing lining structure comprises a primary support, a waterproof layer and a secondary lining; surrounding rock is closely attached to the primary support; the waterproof layer is arranged between the primary support and the secondary lining; the secondary lining is composed of aerogel concrete; and the aerogel concrete is obtained by mixing and stirring hydrophobic aerogel particles, superfine cement, silica fume, high-strength light fine aggregate, natural water, polyacrylonitrile fibers, a superplasticizer and a defoaming agent. The problems that when heat preservation and insulation materials such as polyurethane are laid in an existing tunnel in a cold area, the heat insulation performance is reduced under the seasonal freeze-thaw action, the durability is poor, the site construction process is complex, and safe operation of the tunnel in the cold area is affected can be solved.

Description

technical field [0001] The invention belongs to the technical field of antifreeze and heat preservation of tunnels in cold regions, and relates to a self-insulation and antifreeze lining structure for traffic tunnels in seasonal frozen soil regions. Background technique [0002] After the tunnel is completed in the seasonally frozen soil area, the flow of cold air will take away a large amount of heat in the cold season, causing the tunnel drainage system to freeze and paralyze, and the freeze-thaw cycle will reduce the strength of the surrounding rock. [0003] At present, antifreeze measures for tunnels in cold regions mainly include: heating method, heat insulation layer method and cold door method. Among them, the thermal insulation layer is widely used because of its small engineering investment, strong applicability, and meeting the requirements of thermal insulation; there are two main ways to lay thermal insulation materials: the first is between the initial support ...

AI Technical Summary

Problems solved by technology

However, the traditional thermal insulation structure has the following problems. The first is that due to the flammability of the thermal insulation material and the complexity of the construction and installation process, special fire prevention and finishing treatments are required for the thermal insulation material; when the thermal insulation material is covered on the lining surface, it is difficult to prevent diseases such as lining cracks found, cannot be treated in time

The flammability of the second thermal insulation layer material makes it easy to cause a fire when the secondary lining steel bars are welded; the thermal insulation material that has been constructed is easy to fall off when the secondary lining is vibrated; It is not easy to maintain and handle; the thermal insulation material is installed between the primary support and the secondary lining. Due to the presence of load and water, the thermal insulation material is easy to absorb water and deform, making the thermal insulation effect worse or even damaged.

In addition, both lining structures need to be laid with thermal insulation layer, the tunnel excavation section is enlarged and a construction process is added, which prolongs the construction time

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