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

A natural ventilation, smoke prevention and exhaust technology, which is applied in mine/tunnel ventilation, earthwork drilling, mining equipment, etc., can solve the problems of high cost of equipment maintenance, power consumption, large excavation space, and high tunnel section. The effect of saving construction and operating costs, reducing emission concentration, and improving safety

Inactive Publication Date: 2008-10-01
南京市建设委员会 +5
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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

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

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Embodiment Construction

[0029] Referring to Figure 1, the tunnel has two ports, the tunnel entrance 3 and the tunnel exit 4. In practical applications, this technology is still used even if the tunnel has multiple ports. The working principle of the system is the same, only the specific location and number of natural ventilation shafts are set. different.

[0030] Set several ventilation shafts on the top or side of the tunnel as required, see shaft 1 and shaft 2 in Figure 1. The ventilation shafts can be set along the entire length of the tunnel, or can be set in sections along the tunnel. The shaft position, cross-sectional shape and area can be changed by common means according to actual conditions, and the maximum distance between shafts should not be greater than 250 meters.

[0031] Referring to Fig. 1, during normal operation, the air in front of the vehicle 5 in the tunnel is squeezed and discharged from the shaft in front of the vehicle 5, and the air behind the vehicle 5 in the tunnel flow...

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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...

Claims

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Application Information

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IPC IPC(8): E21F1/18
Inventor 邹建平茅靳丰邹锐朱培根钟星灿龚延风樊白桦唐志坚梅健范良凯童艳
Owner 南京市建设委员会
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