A deep foundation structure against freeze-thaw damage in permafrost regions

Abstract

The invention discloses a deep foundation structure for preventing freeze-thaw damage in the permafrost region, which comprises a deep foundation installed in the frozen soil layer and a plurality of pipes pre-buried outside the deep foundation, each of which is equipped with a movable The lower end of the moving block inside the pipe is covered with liquid, the outer part of the pipe is covered with a heat-insulating sleeve, and more than one extruding plate is arranged in a ring structure between the heat-insulating sleeve and the pipe, and the upper end of the moving block is equipped with The first spring and the upper end of the first spring are all installed on the top surface inside the pipeline, and a fixed ring is poured and fixed on the upper end of the deep foundation, and an extruding mechanism is installed between the fixed ring and the pipeline. The invention has a simple structure, and can squeeze the soil around the deep foundation through the principle of water expansion and contraction, thereby greatly reducing the generation of gaps and increasing the density of the soil around the deep foundation. The pipe can be extruded toward the end of the deep foundation, further increasing the extrusion effect.

Description

technical field [0001] The invention relates to the technical field of deep foundation structures, in particular to a deep foundation structure for preventing freeze-thaw diseases in permafrost regions. Background technique [0002] With the implementation of a series of major national policies such as the development of the west of my country and the revitalization of the old industrial base in Northeast China, a large number of people's livelihood projects have been implemented in my country's permafrost regions (about 21.5% of the country's land area, mainly distributed in the northeast of Inner Mongolia, Heilongjiang, etc.) , Xinjiang and Qinghai-Tibet Plateau) planning and construction, such as Qinghai-Tibet Highway, Qinghai-Tibet Railway, Qinghai-Tibet DC Power Transmission and Transformation Network Project, Sino-Russian Oil Pipeline, Huliao DC Power Transmission and Transformation Project, and the Qinghai-Tibet Expressway under planning, China, Mongolia and Russia Powe...

AI Technical Summary

Problems solved by technology

The existence of these engineering buildings will significantly affect the thermal state of the permafrost foundation below, causing the degradation or even melting of the permafrost, resulting in a decrease in the strength of the permafrost foundation, which may have a significant or even catastrophic impact on the stability of the engineering buildings.

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