Frozen soil area roadbed heat preservation structure, construction method and application

Abstract

The invention discloses a frozen soil area roadbed heat preservation structure, a construction method and application. A sand cushion layer is laid on the roadbed, a polyurethane heat preservation layer is sprayed or a polyurethane gravel mixture layer is laid on the sand cushion layer, geotechnical cloth is laid on the polyurethane heat preservation layer or the polyurethane gravel mixture layer,a sand / gravel cushion layer is laid on the geotechnical cloth, and railway ballasts are arranged on the sand / gravel cushion layer; polyurethane heat preservation layers are sprayed on side slopes onthe two sides of the roadbed or polyurethane gravel mixture layers are paved on the side slopes on the two sides of the roadbed, geotechnical cloth is laid on the polyurethane heat preservation layersor the polyurethane gravel mixture layers, and a sand / gravel cushion layer is laid on the geotechnical cloth; and the frozen soil area roadbed heat preservation structure is used for treating frost heaving and thaw collapse diseases of railway beds in seasonal frozen soil areas. According to the roadbed heat preservation structure and the construction method, the good heat preservation and heat insulation functions are achieved, the influence of external atmospheric temperature changes on a frozen layer in the roadbed can be reduced, the frost heaving and thaw collapse problems of the roadbedcan be solved, and thus the smoothness of a track line can be effectively kept.

Description

technical field [0001] The invention belongs to the technical field of roadbed restoration, and relates to a roadbed thermal insulation structure, construction method and application in permafrost regions, in particular to a subgrade thermal insulation structure, construction method and construction method for treating frost heaving and thawing subgrade diseases of railway subgrades in seasonal frozen soil regions. application. Background technique [0002] Seasonally frozen soil is mainly distributed in the three northeastern provinces of my country, Inner Mongolia, Tibet, and Xinjiang. The construction of railway subgrades in these areas will face the key technical problems of frost heaving and thawing. Frost heaving and thawing of railway subgrades in seasonally frozen soil areas is mainly reflected in that the surface temperature of the subgrade gradually decreases with the decrease of atmospheric temperature in autumn and winter. When the temperature is lower than 0 °C,...

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Problems solved by technology

[0004] According to the investigation of the subgrade sections of Qinghai-Tibet Railway, Lanzhou-Xinjiang High-speed Railway, Harbin-Dalian High-speed Railway and Beijing-Shenyang High-speed Railway that have been put into operation, it is found that after the above-mentioned anti-frost heaving and thawing measures are used to treat the subgrade, the subgrade seasonal frost heaving and thawing The problem has been largely controlled; however, the thermal insulation efficiency of the above measures is not high, and the problem of subgrade frost heaving and thawing in seasonally frozen soil areas has not been cured, and the phenomenon of frost heave and thawing settlement is still common; and the above measures have greatly increased The maintenance and repair workload of the ballasted track subgrade section of the railway is reduced

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