Roadbed freezing and thawing prevention and treatment method and structure

Abstract

The invention provides a roadbed freezing and thawing prevention and treatment structure which is used for being laid on a plane of a longitudinal drainage ditch higher than the side edge line of a roadbed, the roadbed freezing and thawing prevention and treatment structure comprises a layer of waterproof air bag film, and a plurality of air bags which are evenly arranged and protrude upwards are formed on the waterproof air bag film; a hollow supporting cylinder is arranged above each air bag of the waterproof air bag film; a cover plate covers the upper portion of each supporting cylinder, and the adjacent cover plates are connected into a whole through connecting pieces. According to the roadbed freezing and thawing prevention method and structure, through the waterproof air bag film, moisture infiltration is isolated, and meanwhile a stable air layer is provided to isolate heat conduction. The supporting cylinders and the cover plate are connected into a whole, uniform structural gaps are provided, the blockage of the heat exchange channel is avoided through the internal air bag, the compressible air bag can absorb volume expansion after water is frozen, frost heaving is avoided, and the structure can have the functions of water isolation, drainage and ventilation.

Description

technical field [0001] The invention relates to a roadbed construction technology in permafrost regions, in particular to a prevention and control technology for preventing roadbeds from being affected by freeze-thaw disasters, and in particular to a roadbed freeze-thaw prevention method and structure. Background technique [0002] Permafrost refers to various rock and soil structures that contain ice at temperatures below zero degrees Celsius. If engineering measures are not adopted for roads built on frozen soil subgrades, freezing and thawing will often occur and cause a series of problems. [0003] In "Thermal Stability of Main Frozen Soil Subgrade Engineering and Main Freeze-Thaw Disasters of Qinghai-Tibet Railway" (Journal of Earth Science and Environment, Volume 33, No. 2, June 2011, Niu Fujun, etc.), introduced the temperature change caused by climate warming Disturbance of frozen soil subgrade, and some countermeasures to prevent subgrade thermal stability from fre...

AI Technical Summary

Problems solved by technology

If the block stone structure is used, it is difficult to control the size and position distribution of the block stones, resulting in uneven gaps between the block stones, which are prone to large-scale blockage, and eventually cut off the convective heat exchange channels in the block stone subgrade

The drainage function of the block stone structure with large gaps blocked is severely weakened, which makes the water content in the subgrade rise, and severe frost heave is very prone to occur

[0005] "Research Status of Frost Heave Disease Prevention and Control Measures in Frozen Soil Areas" (People's Pearl River Vol. 40, No. 6, June 2019, Fan Rongquan, etc.) proposed several methods to control the moisture in the soil for the problem of frost heave, including laying geotechnical However, the conclusion is that the laying of geomembrane is easily damaged during the construction process, resulting in a significant reduction in the effect of frost heave prevention

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