Anti-frost-lifting anti-thaw-collapse foundation self-refrigeration device and use method thereof

Abstract

The invention relates to an anti-frost-lifting anti-thaw-collapse foundation self-refrigeration device and a use method thereof. The device includes a foundation side wall self-refrigeration structureand a lock catch, and the foundation side wall self-refrigeration structure is arranged on the periphery of a pile foundation and includes a temperature sensor, a temperature control device, a control switch, a liquid nitrogen storage tank, an S-shaped tube and a vacuum generator. The temperature sensor is arranged on the side wall of pile foundation and connected with the temperature control device, the temperature control device is connected with and controls the control switch which is connected with the liquid nitrogen storage tank and one end of the S-shaped tube, the liquid nitrogen storage tank is arranged near the pile foundation, the S-shaped tube is arranged on the periphery of the pile foundation, the other end of the S-shaped tube is connected with the vacuum generator which is arranged near the pile foundation, and the lock catch is arranged on the pile foundation. The device makes the pile foundation effectively resist uplifting force and thaw collapse caused by swellingforce of frozen earth, and is suitable for pile foundations in high-cold areas, especially in permafrost or seasonal frozen soil areas, to prevent tower foundations of power transmission lines from frost lifting thaw collapse.

Description

Technical field [0001] The invention relates to a pile foundation self-refrigeration device capable of preventing freezing uplift and thawing settlement, belonging to the technical field of infrastructure construction. Background technique [0002] With the development of science and technology and the demand for informatization to cover all regions, the demand for infrastructure construction for informatization is increasing. Therefore, a large number of transmission lines will be built under severe conditions such as high altitude and severe cold. Transmission lines in perennial frozen soil areas are often damaged by freezing uplift and thawing, and repairing requires huge manpower and material resources, causing serious economic losses. Therefore, the tower foundations of transmission lines in permafrost regions such as the Qinghai-Tibet Plateau are often damaged. In the process of construction and operation, ensuring the overall stability of frozen soil and tower foundation ...

AI Technical Summary

Problems solved by technology

However, this method is difficult to solve the overturning problem of the pile gene being tilted or collapsed by the freeze-thaw cycle due to the uplifting effect caused by the combination of horizontal and vertical loads in the permafrost area.

(2) The heat of hydration generated in the process of pouring concrete on site will cause the temperature around the permafrost to rise, causing rethawing of the permafrost, resulting in instability of the pile foundation, and even directly causing the instability and destruction of the pile foundation

(3) The method of excavation and backfill will destroy the originally weak ecological environment in cold regions to a certain extent, resulting in the degradation of permafrost, which will lead to the problem of pile foundation thawing and settlement disasters

(4) During the on-site construction process, due to the disturbance of permafrost by construction activities, including vehicle driving and long-term material accumulation, the bearing capacity of permafrost is reduced; at the same time, the construction of existing permafrost areas method can exacerbate construction costs

[0004] The traditional construction method in permafrost areas uses cast-in-place concrete pile foundations with large excavation and replacement of filling soil, but this construction method is difficult to solve the overturning of piles caused by the uplifting effect of frost heaving force in permafrost areas At the same time, due to the heat of hydration of cast-in-place concrete, the surrounding permafrost will re-thaw, reducing the bearing capacity of the permafrost; in addition, construction disturbance and Material buildup is also often overlooked

Images