Ventilation method for high gas extra-long tunnel construction

A technology for tunnel construction and ventilation methods, which is applied in mine/tunnel ventilation, earthwork drilling, mining equipment, etc., to reduce construction risks, improve ventilation effects, and ensure personal safety

Active Publication Date: 2019-01-04
中铁一局集团第五工程有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing shaft ventilation technology only uses the shaft as a natural exhaust channel, and the air intake method has not changed, which has not fundamentally solved the ventilation problem of high-gas long tunnel construction

Method used

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  • Ventilation method for high gas extra-long tunnel construction
  • Ventilation method for high gas extra-long tunnel construction

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Embodiment Construction

[0021] Attached below Figure 1-2 An embodiment of the present invention is described.

[0022] Step 1: Calculate the air volume required for tunnel construction ventilation according to the blasting smoke exhaust of the construction tunnel, the minimum allowable wind speed, the amount of gas gushing out, the maximum number of people working in the tunnel at the same time, and the use of internal combustion engine exhaust gas in the dilution tunnel, and select the maximum value ; Then according to the maximum air volume required for ventilation, select the models of the axial flow fan Ⅰ2, axial flow fan Ⅱ4, jet flow fan Ⅰ6, and jet flow fan Ⅱ8, and the axial flow fan Ⅱ4, jet flow fan Ⅰ6, and jet flow fan Ⅱ8 must be explosion-proof product. At the same time, a tile-electric locking system and a wind-powered locking system are installed in the tunnel and working conditions are set.

[0023] Step 2: Before the ventilation shaft 1 is penetrated, install an axial flow fan I2 at e...

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Abstract

The invention provides a ventilation method for high gas extra-long tunnel construction. The ventilation method for the high gas extra-long tunnel construction comprises the steps that the ventilationmethod is divided into two stages for ventilation according to a construction progress; a first stage, specifically, before a ventilating shaft is completed, a forced ventilation mode is adopted in an outlet work area and a tunnel middle inclined shaft work area; a second stage, specifically, after the ventilating shaft is completed, the ventilation mode of inlet and outlet work areas of two endsof a tunnel is not changed, and a jet fan is additionally added in a hole to reinforce return air according to the construction progress; and a creative ventilation mode of self-shaft suction type ventilation and self-inclined shaft exhaust air is adopted in the tunnel middle inclined shaft work area, and the jet fan is additionally added in the hole according to the construction progress of thework surface of the two ends of the inclined shaft work area, so that polluted air is discharged from a self-inclined shaft through the jet fan. Two types of the ventilation modes are matched reasonably through different stages and different work areas, the ventilation effect is improved, and the construction cost can be greatly reduced. And meanwhile, the personal safety of constructors is ensured by arranging a wind power locking and tile power locking system.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction ventilation method for a long high-gas tunnel. Background technique [0002] With the vigorous development of national railway construction, some long tunnels and even extra-long tunnels have gradually increased, and ventilation has become a key problem. The loss is large, resulting in an increase in cost, and the return air effect is poor. It is difficult to meet the ventilation requirements of long tunnels and even ultra-long tunnels. Therefore, the use of shaft ventilation has become a necessary component in more and more high-gas long tunnels. The ultra-deep shaft ventilation technology reduces the ventilation distance. On the one hand, it provides a good working environment for construction workers and reduces the health hazards caused by poor ventilation and smoke; on the other hand, it can save costs and improve economic benefits. . However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F1/00
CPCE21F1/006
Inventor 王养文何小龙夏龙程凯锋王建春支永辉赵建刚崔文论王鹏
Owner 中铁一局集团第五工程有限公司
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