A multi-stage airflow combined cold and warm air isolation insulation system for tunnels in cold regions

Abstract

The invention relates to a multi-stage airflow combined cold and warm air isolation and heat preservation system for tunnels in cold regions. The system consists of a cold air isolation module and a warm air isolation module, which are installed at both ends and inside of the tunnel and can be combined in multiple stages. Each The three-dimensional air supply on the left and right sides and the top of the module forms a combination of three airflows, which intercept the intrusion of cold air and prevent the heat deposited in the tunnel from flowing out. Compared with the top blowing air curtain, the distance of intercepting air supply is reduced by 50%, and the wind speed at the end is increased by more than two times , the cold air isolation module uses the cold air outside the tunnel to block the intruding cold air convection outside the tunnel, and the warm air isolation module uses the warm air inside the tunnel to block the warm air convection in the tunnel and avoid heat loss in the tunnel. The heat dissipation of the soil maintains the temperature of the inner wall and realizes the insulation of the tunnel. No third-party heating facilities are required, no heat energy consumption, safe operation is ensured, and tunnel operation and maintenance costs are reduced.

Description

technical field [0001] The invention relates to a multi-stage air flow combined cold and warm air isolation and heat preservation system for tunnels in cold regions. Background technique [0002] With the continuous development of tunnel road and railway traffic construction in cold regions such as Northeast my country, Inner Mongolia, northern Xinjiang, northern Tibet, and Qinghai, the problem of damage to tunnels in cold regions has become increasingly apparent. Due to the influence of cold air convection outside the tunnel, the temperature inside the tunnel The gradual reduction will eventually cause the surrounding rock in the tunnel to freeze, the lining layer will be damaged by frost heave, and the water will seep and freeze in the cave, which will seriously threaten the driving safety, and even cause the tunnel to be scrapped, greatly increasing the operation and maintenance cost of the tunnel. [0003] Common anti-freezing measures for tunnels in cold regions mainly i...

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Problems solved by technology

[0002] With the continuous development of tunnel road and railway traffic construction in cold regions such as Northeast my country, Inner Mongolia, northern Xinjiang, northern Tibet, and Qinghai, the problem of damage to tunnels in cold regions has become increasingly apparent. Due to the influence of cold air convection outside the tunnel, the temperature inside the tunnel Gradually lowering, eventually causing the surrounding rock in the tunnel to freeze, the lining layer to be damaged by frost heaving, water seepage and freezing in the tunnel, seriously threatening the driving safety, and even causing the tunnel to be scrapped, greatly increasing the operation and maintenance cost of the tunnel

[0003] Common anti-freezing measures for tunnels in cold regions mainly include installing top-blowing air curtains or hot air curtains at the tunnel entrance to intercept external cold air. 10 meters, even if the wind speed at the outlet of the air curtain is 30m / s, due to the fast attenuation of the wind speed, the wind speed at the end of the ground is less than 1-2m / s. The internal temperature keeps dropping, the effect of this interception measure is poor, and the operation consumes a lot of energy. In practical applications, it is impossible to prevent frost damage in tunnels.

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