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Automatic temp-control and ventilation device of subgrade

A technology of automatic temperature control and ventilation device, applied in the direction of roads, roads, infrastructure engineering, etc., can solve the problems of negative roadbed stability, subgrade subsidence, and inability to cool the roadbed, so as to avoid negative heating effects, promote stability, and improve The effect of cooling

Inactive Publication Date: 2007-11-07
COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.
As a result, the cooling effect of the ventilated subgrade will be greatly reduced, and the temperature amplitude around the ventilation pipe will be increased. In areas with high moisture content, the freezing and melting of water will cause frost heaving and thawing of the subgrade; in some areas, the melting range is too large It will also lead to the subsidence of the roadbed caused by the melting of the underground ice on 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

Method used

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  • Automatic temp-control and ventilation device of subgrade
  • Automatic temp-control and ventilation device of subgrade
  • Automatic temp-control and ventilation device of subgrade

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Embodiment Construction

[0032] specific implementation

[0033] The present invention will further describe embodiment in conjunction with accompanying drawing:

[0034]With reference to Fig. 1, 2, be a kind of automatic temperature control ventilation device of roadbed, comprise the ventilation pipe 2 that is located at roadbed 3; Automatic temperature control device 1 is established on ventilation pipe 2; Wherein said automatic temperature control device 1 includes : a temperature sensing unit, which senses the temperature change at the roadbed; and a braking unit, whose action is controlled by the temperature sensing unit; an airflow control unit, whose switch is controlled by the braking unit. The temperature sensing unit includes a closed box with a light-transmitting surface and a heat-absorbing plate 7 inside the box; the closed box is made of heat-insulating material, and the heat-absorbing plate 7 is made of black heat-absorbing material . The braking unit is located in the temperature sen...

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Abstract

A temp controlled 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 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 that effectively protects the stability of the lower permafrost during engineering construction in a permafrost region, in particular to an automatic temperature control 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 in permafro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/35E01C3/00
Inventor 俞祁浩程国栋马魏
Owner COLD & ARID REGIONS ENVIRONMENTAL & ENG RES INST CHINESE