City tunnel shaft type natural ventilation and smoke-discharging proof method

Abstract

The invention discloses a city tunnel structure system, a city tunnel is equipped with a plurality of naturally ventilating vertical wells, the top end of the vertical well is communicated with the ground, the lower end of the vertical well is communicated with the inside of the tunnel. The vertical well is arranged on the top or side upper part of the tunnel along the length direction. The naturally ventilating vertical wells can be arranged continuously along the whole length of the tunnel, or discontinuously along the whole length of the tunnel, the largest distance between the vertical wells is preferably larger than 240 meters. The top end of the vertical well can be added with a wind cap, and an auxiliary ventilator is added when natural ventilation amount is adequate. The invention also discloses a city tunnel vertical well type natural ventilation and smoke control technology using the structure system, which is suitable for single cavity two-direction traffic tunnels, as well as double cavity two-direction traffic tunnels. The invention solves the problems of ventilation and smoke control of a city tunnel having a length ranging from 500 meters to 1500 meters, greatly saves the cost for tunnel construction and running, and reduces the emission concentration of pollutants at the outlet of the tunnel.

Description

technical field [0001] The invention relates to a shaft-type natural ventilation and smoke prevention and exhaust technology for urban tunnels, which is mainly applied to the ventilation of urban tunnels with a length between 500 and 1500 meters and the smoke prevention and exhaust in case of fire. Background technique [0002] There are two types of ventilation in urban highway tunnels: natural ventilation and mechanical ventilation. Article 3.9.1 of "Code for Design of Ventilation and Lighting of Highway Tunnels" (JTJ 026.1-1999) stipulates that fire countermeasures must be considered in ventilation design, and smoke exhaust measures should be considered for tunnels with a length greater than 1500m and a large traffic volume. Code for Design of Fire Protection (GB50016-2006) tells that as long as the tunnel passing motor vehicles is longer than 500 meters, a mechanical smoke exhaust system should be installed. Therefore, it remains to be discussed whether the urban tunnel...

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Problems solved by technology

[0003] The main disadvantages of mechanical ventilation are: firstly, for the installation of ventilation equipment, the section of the tunnel is relatively high, the excavation space is relatively large, and the cost of equipment maintenance and power consumption after completion and commissioning are very high; secondly, at the exit of the tunnel, air pollution The concentration is highly concentrated, making it difficult to meet environmental protection requirements, and it is difficult to set up exhaust towers for high-altitude emissions in urban areas

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