Measure for enhancing electric transmission line tower footing frozen soil foundation stability

Abstract

The invention relates to a measure for enhancing electric transmission line tower footing frozen soil foundation stability. The measure is characterized in that gravity type heat pipes are buried on the periphery of a tower footing foundation of an electric transmission line, heat preservation materials are distributed on a horizontal layer on the periphery of a pile end and a pile body at the top of the tower footing foundation, and soil layers densely higher than an earth surface strap gradient are built above the earth surface and surrounding tower legs of the tower footing foundation, wherein strap gradient waterproof films are paved in the soil layers. The gravity type heat pipes and the heat preservation materials are effectively combined so that the practical use quantity of the gravity type heat pipes can be greatly reduced, project investment can be greatly reduced in terms of the project, construction difficulty is reduced, and construction period of project measures is shortened. In addition, in terms of overall efficacy, compared with a hot rod single measure, the measure for enhancing electric transmission line tower footing frozen soil foundation stability manyfold improves and radically changes the overall cooling efficiency of the electric transmission line tower footing frozen soil foundation and maintain long-period stability of the tower footing foundation.

Description

technical field [0001] The invention relates to the technical field of frozen soil foundations of transmission line tower foundations, in particular to measures for enhancing the stability of transmission line tower foundations of frozen soil foundations. Background technique [0002] Frozen soil is a kind of soil and rock with a temperature below 0°C and contains ice. According to the length of frozen soil preservation time, it is mainly divided into seasonal frozen soil (half a month to several months) and permafrost (more than one year). my country's Qinghai-Tibet Plateau is the most widely distributed area of ​​high-altitude and low-latitude permafrost in the world. Not only will the properties of permafrost undergo complex and fundamental changes compared with thawing soil due to the existence of ice, but also in permafrost areas, through long-term Evolution, development and change will form a thick layer of underground ice with a thickness of several meters or even more...

AI Technical Summary

Problems solved by technology

At the same time, the Qinghai-Tibet direct current interconnection permafrost project is affected by groundwater, and most of the tower foundations are completed in winter. Affected by the cold temperature in winter, the backfill soil is more difficult to compact

As a result, the melting and settlement process of the backfill soil in the warm season leads to the existence of a large number of cracks and cracks on the edge and inside of the foundation pit (such as figure 1 As shown), the serious consequence is that the lower permafrost is directly exposed to the outside world, and the warm season precipitation directly invades the permafrost, which seriously affects the stability of the permafrost

In addition, due to the intrusion of a large amount of water, during the freeze-thaw cycle, due to the expansion and contraction of the volume of the water in the process of freezing and melting, it will lead to secondary disasters such as frost heaving and thawing.

Images