Tunnel construction requires fans and tunnel ventilation ducts to form a good ventilation system. So, should we choose a fan or a tunnel ventilation duct first? Tunnel ventilation generally involves selecting tunnel ventilation pipes first, followed by selecting fans. Sometimes, it is necessary to choose a matching tunnel ventilation duct based on the selection of the fan.
The selection of fans mainly depends on the length of the tunnel, the larger distance of the tunnel, and the required air supply volume. In the selection of tunnel ventilation pipes, ventilation pipes can meet the air supply volume required for larger distances.
Currently, many companies specify the required tunnel ducts based on the power diameter of the fan. When selecting tunnel ventilation ducts, attention should be paid to their resistance to Slovak tension and air leakage rate. It is necessary to choose ventilation ducts with strong resistance to Slovak tension and low air leakage rate. This type of ventilation duct is not easily damaged, has a higher effective air supply volume, and a longer air supply distance.
In tunnel ventilation, the air ducts of local exhaust tunnel fans must use hard air ducts or steel wire skeleton rubber or plastic telescopic air ducts. Rubber or plastic wind belts must have anti-static and flame-retardant properties. When installing the skeleton wind belt, be careful to handle it with care during loading and unloading, and avoid radial compression or collision with sharp objects to avoid damage.
When connecting the tunnel wind belt with the quick connector soft belt, the end circles of the two wind belts should be aligned and connected, and then the circles at both ends should be clamped with the quick connector. The tightening force of the connector should be appropriate to prevent air leakage and extraction. When adding an air belt at the end of the air belt, the additional air belt should be hung on the steel strand (hemp rope, lead wire or steel wire rope) used for hanging the air belt to align the joint and avoid bending and folding of the air belt.
Single inclined shaft and single tunnel bidirectional construction refers to the construction method of excavating in two directions after entering the tunnel from the inclined shaft. How to choose tunnel ventilation belt?
Two air supply fans are installed outside the inclined shaft, and the air outlets of the two air supply ducts, namely the tunnel air duct, are respectively located near the two tunnel faces. The fresh air outside the tunnel is sent to the tunnel working face through the tunnel air duct by the supply fan, while the dirty air flows from the two tunnel working faces to the inclined shaft and is then discharged outside the tunnel through the inclined shaft. When connecting the tunnel air duct used for tunnel ventilation, the principle of straightness should be followed to ensure smooth tunnel ventilation.
If turning, use a turning wind band, also known as a skeleton wind band, so that the turn will not be obstructed and the ventilation will be smooth. Select the appropriate tunnel wind belt based on the power of the air supply fan and the length of the tunnel air supply distance.