Natural ventilation method of tunnel sound barrier

Abstract

The invention discloses a natural ventilation method of a tunnel sound barrier aiming that a natural ventilation vent hole of an existing tunnel sound barrier is communicated with the outside, parts of sound waves enter a tunnel through natural ventilation at the top of the sound barrier, the sound-proof effect is not bad, fresh air and tunnel waste gas can be only introduced and discharged by a same natural vent hole because the natural vent hole is formed in the top of the tunnel sound barrier, and the waste gas dilution effect is not ideal. The system comprises a sound barrier butted to a tunnel opening, a top natural vent hole is formed in the top of the sound barrier, the lower parts of the two sides of the sound barrier are provided with side lower natural vent holes, and the top natural vent hole and the side lower natural vent holes are all built-in with electric sealed valves. The effective organization of air current in the sound barrier and the circulating flow can be realized by a heat pressure difference and an air pressure difference between the top part of the sound barrier and the two side lower electric natural vent holes, the aims of effectively isolating sound, effectively reducing the temperature and waste gas concentration of the tunnel opening and effectively diffusing the flue gas flow in a fire condition can be achieved.

Description

technical field [0001] The invention relates to the field of tunnels, in particular to a natural ventilation system for tunnel sound barriers, and belongs to the technical field of tunnel ventilation. Background technique [0002] With the development of road traffic and urban infrastructure, a large number of urban underground tunnels came into being, followed by the impact of tunnel traffic noise on residential buildings, hospitals, schools, etc. around the entrance of the tunnel. Traffic noise pollution at tunnel entrances has gradually become the most concerned environmental pollution issue for residents along the tunnel. In addition, traffic noise also restricts the economic development of the area around the tunnel entrance to a certain extent. [0003] At present, the main method to solve traffic noise pollutants at tunnel entrances is to use sound barriers, which can be divided into natural sound barriers, artificially constructed sound barriers and special artifici...

AI Technical Summary

Problems solved by technology

However, the actual use effect of this natural vent is not satisfactory

[0004] The reasons for the analysis are as follows: 1) The natural vent is connected to the outside, and part of the sound waves enter the tunnel through the natural ventilation at the top of the sound barrier, and the sound insulation effect is not good; 2) Since the natural vent is set at the top, when traffic The concentration of exhaust gas in the interior increases significantly, fresh air and tunnel exhaust gas can only be introduced and discharged through the same natural ventilation opening, and the exhaust gas dilution effect is not ideal; 3) When a vehicle fire accident occurs in the sound barrier, the natural ventilation opening at the top of the sound barrier is also used as fresh air. The introduction port and the smoke exhaust port cause the smoke flow in the sound barrier to be chaotic, which has no positive effect on the evacuation and escape of personnel

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