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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: 2009-06-24
SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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  • Summary
  • 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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Effect test

Embodiment 1

[0016] Example one: such as figure 1 As shown, in this embodiment, a set of air handling units 2 are installed on the side of the tunnel hole 1, and the air heated and pressurized by the air handling units 2 is sprayed out of the hot air curtain at 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 flow direction of the hot air curtain on the other side of the tunnel. The hot air curtain flows back through the circulating air duct 6 and the rail-crossing air duct 7 to the circulation room 8 connected to the air handling unit inlet 9 and then enters the air handling unit 2. Complete the loop of the hot air curtain.

[0017] Among them, the wind speed of the hot air curtain sprayed by the high-speed nozzle 1 must not be less than 20 m / s, in order to eject a high-speed airflow with a certain thickness, and form a thick hot air curtain at the mouth of the tunnel to block the intrusion of external cold wi...

Embodiment 2

[0019] Embodiment two: such as figure 2 As shown, in this embodiment, a set of air handling units 2, high-speed nozzles 4, and circulation chamber 8 are installed on both sides of the tunnel. Two hot air curtains are generated at the tunnel entrance, and the hot air curtain generated on one side is blown to the other side. The circulation room 8 forms a circulating hot air curtain. The wind speed of the hot air curtain sprayed by the high-speed nozzle 4 must also not be 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 flow chamber 8 on the other side.

[0020] In the case of a parallel Shuangdong tunnel running in two lines, a passage 10 is provided on the tunnel isolation wall 12 through which the hot air curtain flows, and a fire shutter can be installed on the passage 10. A bypass air duct 11 is provided on the isolation wall 12 of the parallel Shuangdong tunnel.

[0021] The invention has been applied in...

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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 tunnel tunnel high-speed thermal circulation air curtain construction method suitable for the main line of rail transit and the entrance and exit lines of high-latitude and high-cold areas. Background technique [0002] In the subway system, when the underground section extends from underground to the ground, due to the influence of the piston wind of the train, the train enters and exits the tunnel entrance, or due to the influence of the adjacent tunnel tunnel, there is an air exchange between the tunnel entrance and the outdoor air. The highest instantaneous airflow can exceed 15m / s in the tunnel where the train is directly traveling, and the wind speed can reach several meters / s due to the influence of the adjacent section. [0003] In the high-latitude and high-cold area similar to Harbin, when the outdoor temperature is extremely low (for example, the heating temperature in Harbin is -26℃ in...

Claims

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Application Information

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Patent Type & Authority Applications(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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