Ventilation system and ventilation method for single-cavern large-section extra-long tunnel construction

A ventilation system and tunnel construction technology, which is applied in mine/tunnel ventilation, earthwork drilling, mining equipment, etc., can solve problems such as tunnel ventilation is not applicable, achieve good economic benefits, improve air supply efficiency, and save costs. Effect

Inactive Publication Date: 2015-03-11
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In the construction of this type of tunnel, the traditional roadway ventilation is no longer applicable. When the excavation distance is small, press-in ventilation can still effectively solve the construction ventilation problem. When the excavation distance is large, how to solve the construction ventilation economically and effectively problem comes into focus

Method used

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  • Ventilation system and ventilation method for single-cavern large-section extra-long tunnel construction
  • Ventilation system and ventilation method for single-cavern large-section extra-long tunnel construction
  • Ventilation system and ventilation method for single-cavern large-section extra-long tunnel construction

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Embodiment example

[0067] like Figure 3-Figure 10 As shown, taking the centerline direction of the tunnel as the longitudinal direction, a construction ventilation temporary partition wall 2 is set on one side of the centerline to ensure that the construction ventilation temporary partition wall 2 and the side walls on both sides of the tunnel respectively surround the cross-sectional area of ​​a closed roadway The ratio is close to 2:1, and the closed roadway with a small cross-sectional area is used as the fresh air inlet roadway 4, and the polluted wind returned from the tunnel surface is discharged from the closed roadway that is two lanes wide, that is, the polluted wind discharge roadway 5. , in the fresh air inlet tunnel 4 and the polluted wind outlet tunnel 5, the number of jet fans is selected according to the principle that the sum of the boost pressure of the jet fans is greater than the tunnel resistance, and the jet fans are evenly arranged to provide wind speed. In the present emb...

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Abstract

The invention discloses a ventilation system and a ventilation method for single-cavern large-section extra-long tunnel construction. The ventilation system comprises a construction ventilation temporary partition (2) arranged on one side of a center line of a tunnel; a ratio of a sectional area of a sealed roadway formed by the construction ventilation temporary partition (2) and one side wall of the tunnel to a sectional area of a sealed roadway formed by the construction ventilation temporary partition (2) and the other side wall of the tunnel is close to 2:1; the sealed tunnel with the smaller sectional area is taken as a fresh air intake airway (4); polluted air returned from a tunnel face is discharged out of the tunnel through a polluted air discharging roadway (5) with the larger sectional area; at the outlet of a tunnel portal, the construction ventilation temporary partition (2) extends out of the portal to separate fresh air from polluted air in an area close to the portal. A jet flow tunnel ventilation mode is adopted, the difficult problem of extra-long-distance air supply during the single-cavern large-section extra-long tunnel construction is solved, the air supply efficiency for the tunnel face is effectively improved, the cost is saved, and a better economic benefit is achieved.

Description

technical field [0001] The invention relates to a construction ventilation system and a ventilation method in a tunnel, in particular to a ventilation system and a ventilation method for solving the construction of a single-hole large-section extra-long tunnel. Background technique [0002] Due to the closed nature of the tunnel structure, exhaust gas generated by mechanical operations during tunnel construction, gunpowder smoke generated by blasting, and toxic and harmful gases overflowing from the formation will accumulate in the tunnel, threatening the health of workers and construction safety. In order to improve the working environment of tunnel construction and protect the health of workers, effective ventilation measures must be taken. [0003] In the construction ventilation design of existing tunnels, almost all tunnels adopt forced mechanical ventilation. Mechanical ventilation includes press-in type, pump (exhaust) type, hybrid type and roadway type. like figur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F1/14
CPCE21F1/14
Inventor 方勇张雪金徐晨范建国曾昌
Owner SOUTHWEST JIAOTONG UNIV
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