Press-in type construction ventilation system for extra-long high-gas tunnel

Abstract

The invention provides a press-in type construction ventilation system for an extra-long high gas tunnel. The press-in type construction ventilation system for the extra-long high gas tunnel comprises a main air inlet unit, a main air return unit and a branch ventilation unit, wherein the air inlet unit comprises an air inlet area, a main pressure fan, three or more fresh air fans and three or more air pipes, the air inlet area is located at the rear ends of a right line and a parallel adit, the air inlet area communicates with a drainage tunnel, and the main pressure fan and the fresh air fans are arranged in the air inlet area correspondingly; the three fresh air fans correspond to a left line, the parallel adit and the right line correspondingly, each fresh air fan supplies fresh air to the corresponding excavation face through the corresponding air pipe, and the main pressure fan is located in the right line and supplies the fresh air to the branch ventilation unit; the main air return unit comprises an air return area which is located at the rear end of the left line and communicates with an inclined shaft; the branch ventilation unit comprises a ventilation area, the ventilation area is located at the front end of the left line, the front end of the right line and the front end of the parallel adit and communicates with the air inlet area and the air return area correspondingly, and the main pressure fan blows the fresh air to the ventilation area, so that old air in the ventilation area can be exhausted from the air return area. According to the press-in type construction ventilation system for an extra-long high gas tunnel, the fresh air and the old air are conveyed separately, and safety is high.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a press-fit construction ventilation system for an extra-long high-gas tunnel. Background technique [0002] In recent years, in the construction of some extra-long double-track (two-hole separate repair) + level-guided tunnels, a new type of super-long tunnel "phase-type hybrid" ventilation system scheme has been applied, which is mainly for double-tunnel separate repair+ The construction organization mode of the extra-long tunnel with flat guidance uses the air pressure difference formed by the natural height difference between the inclined shaft of the tunnel and the drainage tunnel, and combines the setting of the wind wall through the right line to form an overall air inlet roadway (water drainage tunnel) and return air. Roadway (incline), so as to achieve negative pressure exhaust ventilation mode. During the construction period, the "staged" ventilation techno...

AI Technical Summary

Problems solved by technology

With the excavation and construction of the tunnel, the wind wall of the air chamber needs to be moved forward in stages. Although this reduces the air supply distance of the axial flow fan to a certain extent, it will increase the distance for the fresh air on the right line to enter the air inlet channel, and at the same time Wind frictional resistance also increases accordingly, which will make it extremely difficult for the axial flow fan at the wind wall of the air chamber to suck air, making it difficult for it to supply air to the excavation surface, which in turn will lead to insufficient air supply, which will lead to safety problems in tunnel construction

Moreover, in this ventilation system scheme, fresh air and old air are mixed together, and it is difficult to distinguish whether the air reaching the excavation face is fresh air or old air, or a mixture of the two.

Therefore, this ventilation system scheme cannot be applied to the construction of gas tunnels or high gas tunnels

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