High-ground-temperature highway tunnel heat insulation and heat dissipation supporting structure and construction method

Abstract

The invention discloses a high-ground-temperature highway tunnel heat insulation and heat dissipation supporting structure and a construction method. The high-ground-temperature highway tunnel heat insulation and heat dissipation supporting structure comprises surrounding rock and a heat insulation layer on the surface of the surrounding rock, wherein the heat insulation layer is formed by spraying a hard polyurethane heat insulation material to seal the surface of the surrounding rock; a primary support is arranged on the heat insulation layer and formed by spraying steel fiber concrete to cover the surface of the heat insulation layer; a waterproof layer composed of non-woven fabric and a heat-resisting waterproof roll is laid on the primary support; a secondary lining is arranged on the waterproof layer; and a ventilation and heat dissipation structure is arranged in the secondary lining. According to the high-ground-temperature highway tunnel heat insulation and heat dissipation supporting structure and the construction method, the hard polyurethane heat insulation material is directly sprayed to seal the surrounding rock, and heat transmitted to the primary support is blocked or reduced from the source; and through the ventilation and heat dissipation structure of the secondary lining, exchange of high-temperature gas in the secondary lining and normal-temperature gas in a tunnel is achieved, heat is dissipated out of the lining structure, the adverse effect of temperature stress on secondary lining concrete is overcome, and the durability of the tunnel lining structure is improved.

Description

technical field [0001] The invention belongs to the technical field of tunnel lining structures, and in particular relates to a heat insulation and heat dissipation support structure and a construction method for high ground temperature highway tunnels. Background technique [0002] The demand for tunnel engineering construction is increasing, and it is inevitable that they will pass through high geothermal formations, and the problem of high ground temperature has gradually become a major problem that needs to be solved urgently. In the high temperature environment of the lining structure, the heat of hydration is not easy to dissipate during the hardening process of the concrete, which is not conducive to the condensation of the concrete, and then the mechanical properties of the concrete are reduced, and the bearing function cannot be fully exerted; the temperature distribution of the inner and outer sides of the secondary lining structure is uneven, and the temperature st...

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Problems solved by technology

So as to solve the problem of high construction environment in the highway tunnel and the safety of the tunnel support structure in the operation stage under the condition of high ground temperature

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