Application of transparent wall vent pipe-massive stone layer cooling and insulating composite road bed in wide road

Abstract

The invention discloses application of a transparent wall vent pipe-massive crushed stone layer cooling and insulating composite road bed in a wide road. The structure of the road bed consists of a transparent wall vent pipe, a massive crushed stone layer, geotextile, an insulating layer and road bed filling soil; the massive crushed stone layer is paved on a compacted natural ground surface; the transparent wall vent pipe is embedded into the top of the massive crushed stone layer; and then, the geotextile, the insulating layer and the road bed filling soil are paved on the massive crushed stone layer in turn. By using the transparent wall vent pipe, the temperature of the top of the massive stone layer is reduced, the temperature difference between the upper and lower boundaries of the massive stone layer is increased, natural convection of the massive stone layer in a cold season is enhanced, and the cold energy absorption amount of the road bed in the cold season is improved; and by combining the heat insulation property of the insulating layer, the absorption amount is effectively controlled in a warm season, and the net heat release amount of the road bed in a freezing and thawing cycle is greatly improved so as to realize reduction of underlying soil temperature of the wide high-grade road bed, balance the temperature field, promote the upper limit of frozen soil and meet the special requirement of stability of the wide high-grade road bed in a high-temperature permafrost.

Description

Technical field [0001] The invention relates to a roadbed structure form, in particular to a structure form of a permeable ventilation pipe-block crushed stone layer cooling and heat insulation composite roadbed, which can effectively reduce the temperature of frozen soil under the roadbed of high-grade highway and raise the upper limit of frozen soil. Ensure the long-term stability of the frozen soil roadbed. Background technique [0002] Frozen soil refers to soil and rocks with negative temperature and ice, which are mainly divided into permafrost and seasonal frozen soil according to the survival time. my country's permafrost area accounts for about 22.4% of the country's land area, making it the third largest country in the world. Due to the presence of ice and unfrozen water in frozen soil, its properties are extremely complex and extremely sensitive to temperature. Road engineering construction and global warming will cause the warming of frozen soil, bring thawing settl...

AI Technical Summary

Problems solved by technology

However, the thicker concrete slab hinders the heat exchange between the cold outside air and the top of the gravel layer in the cold season to a certain extent, which is not conducive to the rapid and full use of external cold energy

Images