Tunnel wind room relay ventilation method for long blind heading

Abstract

The invention provides a tunnel wind room relay ventilation method for long blind heading, which comprises the following steps of: preparing for construction; constructing wind rooms, i.e. separating the upper cross section of a tunnel in a certain range into the wind rooms by steel plates or arranging main holes with certain length as the wind rooms; ventilating the wind rooms, delivering fresh air to the wind rooms through ventilation pipes and a fan, and then introducing the fresh air to all working surfaces of the tunnel through the wind rooms; examining the ventilation effect of all working surfaces, and analysing a ventilation system and examining the seal conditions of the wind rooms and the ventilation pipes when the ventilation effect cannot meet the requirements on the working surfaces; and increasing excavation mileages when the ventilation effect meets the requirements on the working surfaces. The method largely improves the ventilation conditions of the working surfaces, almost reduces the wind leakage rate of the wind rooms to zero and greatly increases the length of blind heading.

Description

technical field [0001] The invention relates to a relay ventilation method for an air chamber of a long-distance single-headed tunnel. Background technique [0002] With the development of the national economy, the number of long tunnels in railway construction is increasing day by day. In domestic tunnel construction, since the drilling and blasting method is still widely used for excavation, and the degree of construction mechanization is increasing, the deterioration of the working environment in the tunnel caused by the harmful gas generated after blasting and during the operation of internal combustion machinery has become more and more restricting the progress of the project. The key factors that affect the construction period of the project and endanger the health of the workers in the cave. [0003] Tunnel ventilation is the key process of drilling and blasting tunnel construction. The quality of the construction technology in this process will directly affect the o...

AI Technical Summary

Problems solved by technology

There are various forms of tunnel ventilation in China. The single-head press-in construction ventilation has always been one of the technical difficulties in the construction of long tunnels. With the continuous improvement of ventilation theory and technical equipment, the single-head press-in construction ventilation The distance is also getting longer and longer. How to ensure the best effect of single-head construction ventilation is the direction of continuous improvement and research in construction, and the wind chamber relay ventilation is used in trackless transport super-long inclined shafts and super-long tunnels. There are few similar successful cases in China. Even if there are other relay ventilation methods, the ventilation effect is not good, the construction and maintenance are difficult, and the construction cost is relatively high.

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