Tunnel ventilation method

Abstract

The invention discloses a tunnel ventilation method. The tunnel ventilation method comprises the following steps that (1), pollution states in a tunnel are graded according to the working state of thetunnel; (2), a variable-frequency fan is arranged to supply air to the tunnel, and the working state of the variable-frequency fan is divided into four states according to the power; and (3), a dustconcentration sensor for detecting the dust concentration, a carbon monoxide sensor, a nitrogen oxide sensor and an automobile tail gas sensor are arranged in the tunnel, a controller compares detection data of the dust concentration sensor, the carbon monoxide sensor, the nitrogen oxide sensor and the automobile tail gas sensor with a judgment standard, which pollution state the tunnel is locatedat present is judged, and the variable-frequency fan is controlled to be in the corresponding working state according to the current tunnel pollution state. According to the tunnel ventilation method, the working state of the fan is associated with the current pollution state of the tunnel, so that the working state of the fan is changed along with the change of the pollution state of the tunnel,and the technical problem of fan power waste or insufficient pollution discharge force of the fan in fixed-power ventilation is solved.

Description

technical field [0001] The invention relates to the technical field of tunnels, in particular to a ventilation system in tunnel construction. Background technique [0002] In tunnel construction, a complete working cycle is formed by different construction procedures, and excavation is carried out continuously. In the prior art, the working state of the tunnel is divided into blasting, ballasting, primary support, secondary lining support, etc. according to the construction content. [0003] Different pollutants will be produced during the different construction procedures of the tunnel, so the gas environment in the tunnel is obviously different. [0004] During the tunnel blasting stage, the working environment in the tunnel, especially near the tunnel face, will become extremely poor, and a large amount of toxic and harmful gases will be produced, such as dust, carbon monoxide, nitrogen oxides, etc. At this time, the pollutants in the tunnel are mainly dust Mixed pollut...

AI Technical Summary

Problems solved by technology

[0009] In view of this, the purpose of the present invention is to provide a tunnel ventilation method to solve the problem that the tunnel ventilation in the prior art is a fixed power ventilation, and the air volume cannot be flexibly matched with the tunnel working state, which will lead to waste of fan power or insufficient fan sewage discharge capacity. technical problem