Hydraulic automatic temperature control and ventilation device of subgrade

Abstract

A temp controlled hydraulic automatic ventilation system for roadbed features that the airflow in ventilating pipe can be automatically controlled by the variation of ambient temp, so improving the cooling effect and the temp stability of roadbed, and preventing the damage of temp variation to roadbed.

Description

technical field [0001] The invention relates to a device for lowering the temperature of an engineering building foundation for effectively protecting the stability of the lower permafrost during engineering construction in a permafrost area, in particular to a hydraulic automatic temperature-controlled ventilation device for a subgrade. Background technique [0002] Frozen soil refers to various rocks and soils with a temperature at or below 0°C and contains ice. Permafrost refers to frozen soil that remains uninterrupted for many years, centuries or even thousands of years. During the formation and development of permafrost, water migration caused by freeze-thaw cycles often forms a certain or very thick ice layer (called underground ice) at a certain depth underground. [0003] With the development of national production and regional economy, our country has been continuously constructing engineering buildings such as railways, highways, oil pipelines, and optical cables ...

AI Technical Summary

Problems solved by technology

But the outstanding problem is: in the late spring, the whole summer and the beginning of autumn, the air temperature is mostly higher than the internal temperature of the roadbed. Under such conditions, the ventilated roadbed can not cool the roadbed, but has a negative effect on the roadbed.

This will greatly reduce the cooling effect of the ventilation subgrade, increase the temperature amplitude around the ventilation pipe, and cause frost heaving and thawing due to freezing and melting of water in areas with high moisture content; The subsidence of the roadbed caused by the melting of underground ice in the upper part of the permafrost; at the same time, due to the relatively large freeze-thaw cycle, it will also have a certain degree of negative effect on the stability of the roadbed

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