Point exhaust type subway tunnel fire ventilation and smoke exhaust system

Abstract

The invention provides a point exhaust type subway tunnel fire ventilation and smoke exhaust system. The point exhaust type subway tunnel fire ventilation and smoke exhaust system comprises shafts (6) at the two ends of a subway interval tunnel. A smoke exhaust air duct (1) is arranged at the top, between the shafts (6) at the two ends of the tunnel, of the tunnel, and the port of the smoke exhaust air duct (1) penetrates through the shafts (6) to be communicated with the exterior. Smoke exhaust air ports (4) capable of being opened and closed are axially formed in the bottom of the smoke exhaust air duct (1) at equal intervals, and smoke monitoring sensors (7) are arranged near the smoke exhaust air ports (4). Smoke exhaust fans (5) are arranged in the position, close to the port, of an inner cavity of the smoke exhaust air duct (1). The smoke exhaust air ports (4), the smoke monitoring sensors (7) and the smoke exhaust fans (5) are all electrically connected with a central control unit. By the adoption of the system, the transmission distance of high-temperature smoke in the tunnel is shortened, diffusion of the high-temperature smoke in tunnel space is effectively blocked, and smoke exhaust efficiency is high.

Description

technical field [0001] The invention relates to the technical field of tunnel fire ventilation in subway sections, in particular to a point row type subway tunnel fire ventilation and smoke exhaust system. Background technique [0002] At present, longitudinal ventilation is usually adopted for fire ventilation in subway section tunnels (tunnels between two platforms). That is, when the train catches fire, the unidirectional longitudinal air supply from one end of the section tunnel prevents the high-temperature flue gas from returning to the air supply end, and then the high-temperature flue gas is discharged from the tunnel from the shaft in front of the air supply. It has the following shortcomings: Although it can effectively block the backflow of the flue gas, when the ignition site is near the middle of the train, some passengers are always injured in the high-temperature flue gas concentration area; for long section tunnels, the high-temperature flue gas may be pushed...

AI Technical Summary

Problems solved by technology

It has the following disadvantages: Although it can effectively prevent the backflow of smoke, when the fire site is near the middle of the train, some passengers will always be injured in the area where high-temperature smoke concentrates; for longer tunnels, high-temperature smoke may be pushed To another train in the same section of the tunnel, causing damage to the passengers of another train

Moreover, the high-temperature flue gas fills the front of the air supply section of the interval tunnel, causing air pollution in a large area of ​​the tunnel, and will also cause damage to the equipment and facilities in the tunnel

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