Natural ventilation and natural smoke extraction system for urban road tunnel

Abstract

The invention relates to a natural ventilation and natural smoke extraction system for an urban road tunnel. At the top of the road tunnel, ventilating shafts are arranged at intervals distance L, and each ventilating shaft enables the inner space of the tunnel to be communicated with the upper air outside the tunnel, the longitudinal length along the tunnel of the ventilating shaft at the top is W; a buried section is mounted between two adjacent ventilation shafts, a wedge structure is formed at the top of the buried section, the thickness of the wedge structure means the vertical distance H between the lowest point of the wedge structure and the bottom of the ventilation shaft. The natural ventilation and natural smoke extraction system fully utilizes the traffic wind power and the buoyancy of smoke gas, completely abandons the mechanical ventilation and mechanical smoke extraction scheme, thus saves a great deal of operational energy consumption. The smoke extraction has no flow disturbance caused by a fan in the exhaust process, and the smoke layer structure is stable, thus the exhaust smoke will not diffuse throughout the tunnel. The natural ventilation and natural smoke extraction system is utilized to escape, evacuate and rescue.

Description

technical field [0001] The invention relates to the technical field of tunnel ventilation, in particular to a natural ventilation and natural smoke exhaust system for urban road tunnels. Background technique [0002] At present, in order to alleviate the growing urban traffic pressure, some cities used to erect viaducts to build urban express traffic channels. Since the traffic passages formed by viaducts have a relatively large negative impact on the urban landscape and the protection of the old city, and at the same time generate relatively large traffic noise, many cities have chosen to build underground traffic tunnels in recent years. It can be predicted that with the continuous growth of urban traffic flow, the development and utilization of underground space will be greatly strengthened, and such tunnels will continue to increase. [0003] The air environment solution of the underground tunnel not only affects the structural form of the tunnel, but also largely deter...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a natural ventilation and natural smoke exhaust system for urban road tunnels for the ventilation and smoke exhaust problems of urban road tunnels.

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