Anti-freezing and anti-pulling pile body structure in cold region

Abstract

The embodiment of the invention provides an anti-freezing and anti-pulling pile body structure in a cold region. The pile body structure sequentially comprises a pile body section, an anchoring section and a pile end from top to bottom, and the anchoring section comprises an anchoring section pile body, an anchoring sheet, a rotating shaft, a spring and a through hole. The anchoring section is arranged, the anchoring section is provided with the anchoring sheet and the spring, the lower end of the anchoring sheet is hinged to the pile body, the upper end of the anchoring sheet compresses the spring in the driving process, when the pile body is frozen and pulled, the anchoring sheet is opened, pile side soil enters a gap between the anchoring sheet and the anchoring section pile body, uplift resistance is provided for the pile, and pile foundation freezing and pulling are restrained. After a certain freezing and pulling amount is generated in the first cold season, the anchoring sectionobtains enough pulling resistance, the pile foundation does not continue to be pulled upwards any more, and accumulated freezing and pulling diseases are controlled.

Description

technical field [0001] The invention relates to the technical field of pile foundations in frozen soil engineering, in particular to a frost-uplift-resistant pile structure in cold regions. Background technique [0002] Permafrost is soil and rock with a temperature lower than 0°C and contains ice. According to the length of its existence, it can be divided into permafrost and seasonal frozen soil. Frozen soil is widely distributed in my country, and permafrost areas and seasonal frozen soil areas account for About 75% of the country's land area. Permafrost is soil that has been in a frozen state for more than two years. Only a few meters of the surface layer is in a state of summer thaw and winter freezing. This layer is also called the seasonally active layer; seasonally frozen soil is only within a few meters of the surface in winter. Soil that freezes and melts in summer, this layer is also called seasonally frozen layer or seasonally active layer. That is to say, in th...

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Problems solved by technology

However, it can be seen that methods such as replacement, insulation, casing, and anchoring all require structural construction other than the pile foundation, which has problems such as high cost, complicated construction, and difficulty in popularization; cast-in-place variable-section piles require pile hole opening The process of excavating and pouring concrete requires large-scale construction machinery, the construction period is long, the environment is disturbed greatly, and the concrete pile and soil have a large friction coefficient, which is not conducive to reducing the tangential frost heaving force on the pile

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