Design method for optimizing natural smoke exhausting effect of vertical shaft in tunnel fire

A design method and shaft technology, which is applied in mine/tunnel ventilation, mining equipment, earthwork drilling and mining, etc., to achieve the effect of reducing the burden of project cost, improving the effect of natural smoke exhaust, and helping personnel evacuation and rescue

Active Publication Date: 2015-01-07
UNIV OF SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

As for the structure of the shaft above the tunnel roof, it is obviously not necessary to design the connection part in a streamlined shape.

Method used

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  • Design method for optimizing natural smoke exhausting effect of vertical shaft in tunnel fire
  • Design method for optimizing natural smoke exhausting effect of vertical shaft in tunnel fire
  • Design method for optimizing natural smoke exhausting effect of vertical shaft in tunnel fire

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Embodiment Construction

[0034] Below in conjunction with the accompanying drawings, the present invention will be further described by taking a certain longitudinal structure of a tunnel provided with a shaft as an example:

[0035] see figure 1 , the tunnel with a right-angle shaft above the roof includes the tunnel body and the shaft. The length of the main body of the tunnel is more than 500 meters, the inner height of the tunnel is 5.4 meters, the width is 12 meters, the height of the shaft is 2.6 meters (in actual engineering, the height of the shaft is related to the thickness of the soil layer above the tunnel), and the cross-sectional size of the shaft is 3 meters (length)*3 meters (width).

[0036] see figure 2The tunnel with the inclined shaft above the ceiling includes the main body of the tunnel, the shaft, and two triangular prism spaces added at the lower part of the shaft connected to the tunnel (including the upstream and downstream directions of the tunnel). The length of the mai...

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Abstract

The invention provides a design method for optimizing the natural smoke exhausting effect of a vertical shaft in a tunnel fire. In current tunnels where vertical shafts are arranged above ceilings, the connecting angles between the vertical shafts and the ceilings of the tunnels are mostly right angles. According to the design method, the parts (in the upstream direction of a tunnel and the downstream direction of the tunnel), connected with a ceiling of the tunnel, of the lower portion of the vertical shaft are each additionally provided with a triangular prism space, the connecting angle between the vertical shaft and the ceiling of the tunnel is arranged to be an acute angle (ranging from 20 degrees to 70 degrees), and therefore the natural smoke exhausting effect of the vertical shaft can be greatly improved after the fire occurs in the tunnel. The design method is simple in operation, low in economic investment, and can effectively overcome the adverse effects brought to the natural smoke exhausting process of the vertical shaft by the boundary-layer separation phenomenon formed in the vertical shaft by smoke. The design method can optimize natural smoke exhausting after the tunnel fire and daily gas exchange (automobile tail gas and waste heat are exhausted so as to improve the air quality inside the tunnel) between the inner portion of the tunnel and the outside environment, and has broad application prospects and important practical significance.

Description

technical field [0001] The invention belongs to the technical field of fire safety, and in particular relates to a design method for optimizing the natural smoke exhaust effect of a shaft in a tunnel fire. Background technique [0002] Today around the world, due to the rapid development of society and economy, more and more tunnels are under construction. However, the tunnel has a special narrow and long structure, which makes it difficult to discharge a large amount of smoke generated after a fire occurs, which seriously affects the safe evacuation of the masses and the fire fighting by firefighters. According to statistics, 85% of the deaths in building fires are caused by toxic smoke. [0003] At present, there are two main methods of fire smoke exhaust in tunnels: natural smoke exhaust and mechanical smoke exhaust. For mechanical smoke exhaust, in order to install smoke exhaust equipment, the tunnel excavation space is relatively large, and the cost of equipment maint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F1/00E21F1/18
CPCE21F1/00E21F1/18
Inventor 纪杰范传刚原向勇高子鹤
Owner UNIV OF SCI & TECH OF CHINA
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