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Tunnel construction ventilation method through pressing and extracting combination of airtight cavern

A technology of tunnel construction and ventilation method, which is applied in mine/tunnel ventilation, earthwork drilling, mining equipment, etc. It can solve the problems of long smoke exhaust time and poor ventilation effect in tunnel construction, and achieve good ventilation effect and easy operation , the effect of short discharge time

Inactive Publication Date: 2017-01-04
CHINA RAILWAY 19TH BUREAU GRP 1ST ENG
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a ventilation method for tunnel construction using the combination of pressure and pumping in a closed cavern, which solves the problems of long smoke exhaust time and poor ventilation effect in tunnel construction

Method used

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Embodiment Construction

[0010] First, press-in ventilators and exhaust fans are installed at the tunnel entrance, and retractable screen doors are arranged on the second lining trolley adjacent to the tunnel (the second lining trolley moves forward continuously with the excavation of the tunnel). The pressure air pipe of the fan and the exhaust pipe of the exhaust fan extend into the airtight cavern between the screen door and the tunnel surface through the screen door. In the airtight cavern between the door and the tunnel surface, the exhaust fan is turned on to discharge the dirty air out of the cavern, and at the same time, the fresh air outside the cavern is pressed into the shielded door and the tunnel surface by the press-in type fan In the airtight cavern between, when the air quality of the airtight cavern meets the requirements, open the screen door, and then carry out the tunnel construction work.

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Abstract

The invention relates to a ventilation method for tunnel construction. The problems that smoke exhaust time is long and the ventilation effect is poor during tunnel construction at present are main solved. Firstly, a press-in type ventilator and an extracting exhaust type ventilator are mounted at a tunnel portal, a retractable shielding gate is arranged on a secondary lining trolley close to a tunnel, an air pressing pipe of the press-in type ventilator and an exhaust pipe of the extracting exhaust type ventilator extend into an airtight cavern between the shielding gate and a tunnel face through the shielding gate, the shielding gate is closed before tunnel blasting, and smoke produced through blasting is sealed in the airtight cavern between the shielding gate and the tunnel face; then the extracting exhaust type ventilator is started, dirt air is exhausted out of the cavern, and meanwhile fresh air outside the cavern is pressed into the airtight cavern between the shielding gate and the tunnel face through the press-in type ventilator; and after the air quality of the airtight cavern reaches the requirement, the shielding gate is opened, and then the tunnel construction operation is conducted. The method has the advantages that the dirt air exhaust time is short, and the ventilation effect is good.

Description

[0001] Technical field: [0002] The invention relates to a ventilation method during tunnel construction. [0003] Background technique: [0004] The tunnel construction process is in a relatively closed environment. Due to equipment discharge, spray anchor support, blasting and other reasons, smoke and dust cannot be discharged naturally, resulting in poor working environment for construction personnel and machinery, high incidence of occupational diseases, and high equipment failure rate. Therefore, forced ventilation must be carried out to improve the working environment and reduce construction risks. Today's ventilation technology mainly adopts press-in ventilation or tunnel ventilation, which takes a long time to exhaust smoke and has poor ventilation effect. [0005] Invention content: [0006] The technical problem to be solved by the present invention is to provide a ventilation method for tunnel construction using the combination of pressure and suction in a closed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F1/00E21F1/08E21F17/12
CPCE21F1/00E21F1/08E21F17/12
Inventor 邵云帆
Owner CHINA RAILWAY 19TH BUREAU GRP 1ST ENG
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