High-speed thermal circulation air curtain construction method for tunnel portal

A construction method and thermal cycle technology, applied in the ventilation, heating, space heating and ventilation directions of mines/tunnels, which can solve the problems of freezing tunnel mouths and affecting traffic safety, reduce heat demand and stabilize station temperature. , the effect of driving safety

Active Publication Date: 2011-02-09
SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, under normal circumstances, the internal temperature of the subway is kept above 5°C. At the junction of cold and heat at the entrance of the tunnel, the frequent flow of air flows in and out, causing the tunnel entrance to freeze, which affects driving safety.
[0004] In my country, due to the fact that there are few large cities in the high-latitude alpine zone, the subway systems in Shenyang, Changchun, Harbin and other places are still planning or under construction, and there is no existing technology to solve the problem in a targeted manner.

Method used

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  • High-speed thermal circulation air curtain construction method for tunnel portal
  • High-speed thermal circulation air curtain construction method for tunnel portal

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment one: if figure 1 As shown, the present embodiment installs a group of air handling units 2 on one side of the tunnel entrance 1, and the air heated and pressurized by the air handling units 2 sprays the hot air curtain at a high speed through the air outlet 3 and the high-speed nozzle 4 connected to the air outlet. A circulating air duct 6 is set at the position where the hot air curtain flows on the other side of the tunnel, and the hot air curtain flows back through the circulating air duct 6 and the cross-track air duct 7 to the circulation chamber 8 connected to the air inlet 9 of the air handling unit, and then enters the air handling unit 2. Complete the circulation of the hot air curtain.

[0017] Among them, the wind speed of the hot air curtain ejected from the high-speed nozzle 1 must not be less than 20 m / s, so as to eject a high-speed airflow with a certain thickness and form a thick hot air curtain at the cave entrance to block the invasion of ex...

Embodiment 2

[0019] Embodiment two: if figure 2 As shown, in this embodiment, a group of air handling units 2, high-speed nozzles 4 and circulation chamber 8 are respectively installed on both sides of the tunnel, and two hot air curtains are generated at the entrance of the tunnel, and the hot air curtains generated on one side are blown to the other side The circulation chamber 8 forms a circulating hot air curtain. The wind speed of the hot air curtain ejected by the high-speed nozzle 4 must be no less than 20 m / s, and the installation angle of the high-speed nozzle 4 must ensure that the hot air curtain flows to the circulation chamber 8 on the other side.

[0020] When it is a parallel double-hole tunnel running on two lines, a channel 10 is set on the tunnel partition wall 12 that the hot air curtain flows through, and a fireproof roller shutter can be installed on the channel 10 . A detour air duct 11 is arranged on the partition wall 12 of the parallel double tunnel tunnel.

[0...

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Abstract

The invention relates to the field of fixed buildings, in particular to a construction method of a tunnel portal high-speed thermal-circulation air curtain applicable to track traffic positive line and access field line portals in high-latitude and high-cold areas. In the method, when a subway underground section is opened to the ground surface, a tunnel portal is provided with a thermal air curtain spouted at a high speed; a thick air curtain is formed at the tunnel portal, preventing sever cold air outside the tunnel from invading and reducing heat exchange; in a parallel-double-portal tunnel, a communicating channel and a circuitous channel are added and arranged in a partition wall of the tunnel, effectively channelizing train piston air; meanwhile, a circulated air channel, a break-of-gauge channel, a circulation chamber, and the like, are arranged to circulate hot air, thus effectively reducing the calorific requirement of an adjacent station, stabilizing the temperature in a station, and reducing the freezing of a hot-cold intersection of the portal and ensuring traffic safety.

Description

technical field [0001] The invention relates to fixed buildings, in particular to a high-speed thermal cycle air curtain construction method at the entrance of a tunnel entrance, which is suitable for the main line of rail transit and the entrance of the entrance and exit line in high-latitude and cold areas. Background technique [0002] In the subway system, when the underground section extends from the underground to the ground, due to the influence of the piston wind of the train running, the train enters and exits the tunnel entrance, or due to the influence of the train running in the adjacent tunnel, there is an airflow exchange between the tunnel entrance and the outdoor air. The highest instantaneous airflow in the tunnel where the train runs directly can exceed 15m / s, and the wind speed can reach several meters / second due to the influence of adjacent sections. [0003] In high-latitude and high-cold regions like Harbin, when the outdoor temperature is extremely low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F1/14F24F9/00
Inventor 郑晋丽刘锐人阎正才姜益强刘文胜
Owner SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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