Sound barrier smoke exhaust sound absorber and closed sound barrier

Abstract

The invention relates to the technical field of sound barriers, and provides a sound barrier smoke exhaust and sound absorption body and a closed sound barrier, and the sound barrier smoke exhaust and sound absorption body is used for being arranged on the closed sound barrier with the transverse width of 9900mm for smoke exhaust and sound absorption. Comprising a square-ring-shaped outer frame, and a plurality of smoke discharging and sound absorbing pieces are evenly arranged in the outer frame in the transverse direction of the outer frame. The smoke exhaust and sound absorption pieces are obliquely arranged and extend in the longitudinal direction of the outer frame, and smoke exhaust channels are formed between the adjacent smoke exhaust and sound absorption pieces. The smoke exhaust and sound absorption sheet is of a hollow structure, and a plurality of micropores with the diameter of 0.3-0.6 mm are uniformly distributed in the wall of the smoke exhaust and sound absorption sheet; the through-flow rate of the sound barrier smoke exhaust sound absorber is 20%-55%, and the transverse critical width of the sound barrier smoke exhaust sound absorber is 907-2267 mm. According to the closed type sound barrier provided by the embodiment of the invention, by arranging the sound barrier smoke exhaust sound absorber, the smoke exhaust requirement is met, and the noise reduction performance is guaranteed.

Description

Technical field [0001] The present invention relates to the field of acoustic barrier technology, in particular a sound barrier smoke-absorbing body and a closed acoustic barrier. Background [0002] Sound barrier is the most effective means of traffic noise control, especially closed sound barrier, it is the most commonly used engineering measure to solve the traffic noise pollution of high-rise buildings, in recent years, the use of urban traffic is more and more extensive. In the design of the fully enclosed sound barrier of urban rail transit, in addition to meeting the requirements of noise reduction and structural safety, it should also meet the requirements of the "Metro Design Fire Prevention Standards" that the fully enclosed sound barrier of urban rail transit should be set up with a natural smoke exhaust channel of no less than 5% of the horizontal impact area. [0003] At present, a large number of domestic fully enclosed sound barriers are pulled through the top of t...

AI Technical Summary

Problems solved by technology

For example, ventilation and noise reduction louvers are designed on the top of the closed sound barrier, but none of the closed noise barriers currently implemented in China adopts this scheme, mainly because the noise reduction louvers have a large weight, limited noise reduction, and relatively large smoke exhaust resistance. Great security risk

Another example is to design a ventilating and pressure-relieving sound-absorbing and insulating barrier on the side of the closed sound barrier, using the air pressure difference formed between the inside and outside of the sound barrier when the train passes by as the driving force to realize the automatic adjustment of the angle of the rotating louvers, so as to achieve the best pressure relief This type of sound barrier module is usually installed on both sides of the closed barrier. The noise reduction performance of the rotating louver is limited, the resistance is large, and the smoke exhaust performance has not been verified. The actual project has not adopted the leakage Pressure port as smoke exhaust channel

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