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

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...

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.

Images