Rapid ventilation and smoke exhausting device and method for construction period of long-distance tunnel

Abstract

The invention provides a rapid ventilation and smoke exhausting device for a construction period of a long-distance tunnel. The rapid ventilation and smoke exhausting device comprises a gantry bracket, a fixed wind door and a movable wind door, an axial flow ventilator and a jet flow draught fan, and a motor control system, wherein the fixed wind door is arranged at the upper end of the gantry bracket and the movable wind door is arranged on one side of the gantry bracket; the axial flow ventilator and the jet flow draught fan penetrate through the fixed wind door; the fixed wind door is matched with the unfolded movable wind door so that the axial wind flow in the tunnel is separated; a wind inlet of the axial flow ventilator and a wind outlet of the jet flow draught fan are formed in one side, which is close to a working surface, of the fixed wind door; the wind outlet of the axial flow ventilator is connected with a flexible wind barrel; the wind outlet of the flexible wind barrel extends to the outer part of the tunnel. According to a ventilation and smoke exhausting method provided by the invention, the wind doors for separating the axial wind flow are arranged in the tunnel; a safe space and a closed polluted space are formed on the two sides of the wind doors respectively, and pollutants in the polluted space can be discharged out of a hole along an airflow through a closed exhausting channel by using ventilation equipment; blasting equipment is used for blasting wind into the polluted space from the safe space so that the pollutants rapidly flows towards the inlet of the ventilation equipment.

Description

technical field [0001] The invention relates to tunnel engineering construction technology, in particular to a rapid ventilation and smoke exhaust device and method during the construction period of a long-distance tunnel. Background technique [0002] With the rapid and steady development of my country's economic construction, more and more long-distance tunnels have appeared in engineering construction (such as hydropower, highways and other industries). The smoke problem has always been one of the problems that plague engineering. For a long time, in the process of long-distance tunnel excavation, when the distance between the excavation work surface and the tunnel entrance exceeds 2-3Km, the problem of excavation ventilation and smoke exhaust is difficult to solve, especially after excavation and blasting operations, which contain a large amount of CO , NO, NO 2 Toxic and harmful gases and dust, etc., adopt traditional ventilation methods. These toxic and harmful gases ...

AI Technical Summary

Problems solved by technology

For a long time, in the process of long-distance tunnel excavation, when the distance between the excavation work surface and the tunnel entrance exceeds 2-3Km, the problem of excavation ventilation and smoke exhaust is difficult to solve, especially after excavation and blasting operations, which contain a large amount of CO , NO, NO 2 Toxic and harmful gases and dust, etc., adopt traditional ventilation methods. These toxic and harmful gases and dust need to flow through the entire excavated section of the excavated tunnel to be discharged from the blasting operation surface. The time is as long as 3 to 4 hours, or the air near the excavated operation surface does not flow or flows slowly, and the ventilation and smoke exhaust effect is poor. In addition, it is difficult to solve the problem of high ground temperature near the operation surface, and the construction operation environment is harsh

Therefore, poor ventilation conditions during the construction period will make the majority of operators work in the harsh underground environment for a long time, which will affect their lives and health, and seriously threaten the life, health and safety of the operators, and even affect the progress and safety of tunnel construction. duration

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