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Method of inhibiting smoke plug-holing to improve natural smoke extraction efficiency of vertical shaft

A shaft and flue gas technology, which is applied to shaft equipment, ventilation of mines/tunnels, and earth-moving drilling and mining, etc., can solve the problems such as the decline of the smoke exhaust effect of the shaft, and achieve the improvement of smoke exhaust effect, simple operation, high safety and reliability. Effect

Inactive Publication Date: 2017-05-24
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

When the suction through phenomenon occurs, the cold air in the lower part of the tunnel is directly sucked into the shaft, resulting in a significant decline in the smoke exhaust effect of the shaft

Method used

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  • Method of inhibiting smoke plug-holing to improve natural smoke extraction efficiency of vertical shaft
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  • Method of inhibiting smoke plug-holing to improve natural smoke extraction efficiency of vertical shaft

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Embodiment Construction

[0031] 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 an inclined shaft as an example.

[0032] see figure 1 , The tunnel with an inclined shaft above the ceiling includes a tunnel main body 1, an inclined shaft 2 and a baffle 3 fixed on the ceiling. The length of the main body of the tunnel is 60 meters, the inner height of the tunnel is 5.4 meters, the width is 12 meters, the height of the inclined shaft is 6.0 meters (in actual engineering, the height of the shaft is related to the thickness of the soil layer above the tunnel), and the upper opening of the inclined shaft is horizontal. The section size is 3 meters (length) * 3 meters (width). There are two triangular prism spaces at the part where the lower part of the shaft is connected to the tunnel (including the upstream and downstream directions of the tunnel). ) is 1 meter, the connection angle ...

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Abstract

The invention provides a method of inhibiting smoke plug-holing to improve natural smoke extraction efficiency of a vertical shaft; a retaining plate is arranged in the lower portion of a vertical shaft in a tunnel in order to change movement condition of a smoke flow in the tunnel and the vertical shaft in case of a fire, smoke layering plug-holing is inhibited, and smoke extraction effect is improved. The tunnel is 60 m long, 12 m wide and 5.4 m tall, the cross section of an upper opening of the vertical shaft is 3 m in length and 3 m in width, the section of a lower opening is 5 m in length and 3 m in width, the lower portion of the vertical shaft is 45 degrees angled to a tunnel roof, and such design is explained using the vertical shaft 5m tall as an example; meanwhile, the area of the retaining plate is 0.5-2.0 times the area of the lower opening of the vertical shaft, a vertical distance from the retaining plate to the tunnel roof is 0.06-0.28 times the height of the tunnel, plug-holing can be inhibited, and smoke extraction efficiency is improved greatly. The method has the advantages that the structure is simple, economic input is low, the adverse influence on smoke extraction due to plug-holing during natural smoke extraction of the vertical shaft can be overcome effectively, and the method has a promising application prospect and important practical significance.

Description

technical field [0001] The invention belongs to the technical field of fire safety, and in particular relates to a method for suppressing smoke penetration and improving the natural smoke exhaust efficiency of a shaft. Background technique [0002] With the acceleration of urbanization in various countries in the world, the contradiction between urban land use and the scarcity of land resources has become more and more acute, and the number of urban population has increased sharply, accompanied by a continuous decline in per capita road area. In this context, the development and utilization of underground space has become an inevitable choice to alleviate this contradiction. In recent years, a large number of urban underground highway tunnels have appeared, which has relieved the traffic pressure in the city. Urban underground highway tunnel is a typical narrow and long space building, which brings convenience to people's travel and brings new issues to fire prevention and ...

Claims

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Application Information

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IPC IPC(8): E21F1/00E21D8/00E21F5/00
CPCE21F1/003E21D8/00E21F5/00
Inventor 纪杰高子鹤原向勇王浩波万华仙李曼
Owner UNIV OF SCI & TECH OF CHINA
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