Air isolation layer construction method, isolation overhead net and frozen soil roadbed construction method

Abstract

The invention discloses an air isolation layer construction method, an isolation overhead net and a frozen soil roadbed construction method, and belongs to the technical field of roadbed construction. The method comprises the following steps: S1, a sandy gravel cushion layer is laid; and S2, an isolation overhead net is laid on the sandy gravel cushion layer, a hollow layer which can isolate the upper highway pavement from transferring heat downwards and is communicated with the outside on the shady slope side and the sunny slope side is formed, and ventilation holes which are in cold air convection with the shady slope are formed in the position, close to the shady slope, of the bottom of the hollow layer; the air isolation layer can isolate the highway pavement from the frozen earth surface, the hollow layer isolates heat transferred from the highway pavement on the upper portion to the frozen earth surface, convection wind can be formed on the shady slope and the sunny slope to bring the heat out of the hollow layer, and therefore the influence on the frozen earth surface is avoided, and meanwhile the ventilation holes and cold air on the shady slope can form downward convection cold flow. The temperature of the frozen earth surface is further adjusted to guarantee the original state of the frozen earth surface.

Description

technical field [0001] The invention relates to the technical field of roadbed construction, in particular to an air isolation layer construction method, an isolation overhead net and a frozen soil roadbed construction method. Background technique [0002] my country's permafrost is mainly distributed in the high latitudes of Northeast China and the Qinghai-Tibet Plateau. The permafrost is divided into upper and lower layers. The upper layer is the active layer that melts in summer and freezes in winter, and the lower layer is the permafrost layer. The average temperature of the lower boundary of permafrost in the high latitudes of Northeast China is -1 to 1 degree, and the average temperature of the lower boundary of permafrost in the Qinghai-Tibet Plateau is about -3.5 to -2 degrees. The repeated freezing and thawing of the active layer of permafrost will endanger the railway subgrade, but for roads, because of the black asphalt pavement on the surface of the road, the upp...

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Problems solved by technology

However, although the above-mentioned ventilation pipe with openings can take out the heat in the block stone layer and achieve the effect of speeding up the air flow and adjusting the temperature, because the heat on the surface of the upper road is still continuously transmitted downwards, it is only through the wind. The exchange of heat is not enough to ensure that the lower ice-bearing soil layer or ice-rich soil layer will not melt

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