Downstream tunnel length extremum method used for open-type ventilation system for extra-long highway tunnel

A road tunnel, open ventilation technology, applied in mine/tunnel ventilation, earthwork drilling, safety devices, etc., can solve problems such as the unformed method of extreme length of downstream tunnels, high ventilation costs for extra-long tunnels, and urban planning constraints.

CN109057849AActive Publication Date: 2018-12-21HUNAN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-12-21

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Abstract

The invention discloses a downstream tunnel length extremum method for an open-type ventilation system of an extra-long highway tunnel. The method includes the following steps that 1, smoke and dust flow of circulating air flow after purification is calculated; 2, the smoke and dust concentration is calculated when circulating air flow after purification, fresh air flow of a blowing-in vertical shaft and parallel air flow of a tunnel short passage are converged; 3, the smoke and dust flow of newly added downstream air flow is calculated; 4, the cumulative downstream air-flow smoke and dust concentration is calculated; 5, the downstream tunnel length extremum is calculated. The downstream tunnel length extremum calculation formula shows that when the length of a downstream tunnel is equal to or larger than the downstream tunnel length extremum, the smoke and dust concentration exceeds the allowable concentration, and vehicles in downstream tunnel are unsafe. The method can quickly determine the downstream tunnel length for the open-type controllable circulating ventilation system of the extra-long highway tunnel, and the safety of the vehicles in the downstream tunnel is ensured.
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Description

technical field

[0001] The invention belongs to the technical field of tunnel disaster prevention and mitigation, and in particular relates to a downstream tunnel length extreme value method for an open ventilation system of an extra-long highway tunnel. Background technique

[0002] Highway tunnels are long and narrow spaces that are semi-submerged or shallowly buried. The treatment of pollutants such as smoke and dust generated by cars driving in tunnels has always been an important issue of concern to the industry. Generally, mechanical ventilation is used to dilute pollutants such as smoke and CO, and the dirty air is discharged to the environment outside the tunnel, and it belongs to the direct current system scheme. The ventilation system of long-distance or extra-long-distance road tunnels must cooperate with ventilation shafts to meet the wind demand for diluting pollutants in the tunnel. The ventilation of extra-long highway tunnels specifically involves the optimi...

Examples

Embodiment Construction

[0081] The present invention will be further described below in conjunction with the accompanying drawings.

[0082] Such as figure 1 and figure 2 As shown, the open ventilation system of the extra-long highway tunnel applicable to the present invention includes a circulating air duct 5 arranged in the tunnel bypass tunnel and parallel to the tunnel, and the upstream tunnel 2 is between the tunnel entrance 1 and the air induction section B of the circulating air duct 5 The downstream tunnel 8 is between the ejection section E of the circulating air duct 5 and the tunnel exit 9, and the circulating air duct 5 communicates with the tunnel through the air induction section B and the ejection section E at both ends of the circulating air duct 5, and the upstream tunnel 2 and the downstream tunnel 8 There is a tunnel short road 14 between them; a dust collector is provided in the circulating air duct 5; the air induction section B of the circulating air duct 5 communicates with t...