Acoustic barrier

Abstract

The invention discloses an acoustic barrier comprising supporting rib columns, acoustic boards and a back board. A hollow structure is formed between the acoustic boards and the back board, and the supporting rib columns are fixedly bonded on a railway foundation. The acoustic boards are microporous ceramic composite boards with three-dimensional meshy pore structures in disordered communication. The acoustic barrier composed of the supporting rib columns, the acoustic boards and the back board has a camber surface, and the concave direction of the camber surface faces to a railway train operation surface. The lower edge of the back board extends out of the bottom ends of the supporting rib columns. The acoustic barrier is of a three-layer hollow acoustic-absorption acoustic structure, and the microporous ceramic composite boards adopted as the acoustic boards not only have an excellent noise reduction function but also have better processability; the noise-reduction acoustic barrier of the camber-surface structure has better acoustic absorption and reflection properties, and escaped noise can be further reduced. Tests prove that the acoustic barrier has better acoustic absorption performance, and is high in acoustic absorptivity, wide in acoustic absorption frequency band and low in low-frequency acoustic absorption effect. A prefabricated structure of the acoustic barrier is more convenient to process and install, and higher in construction efficiency.

Description

Technical field [0001] The present invention belongs to the field of railway operation noise control technology, especially in high -speed railway noise control technology, which involves a sound barrier applied to high -speed railway. Background technique [0002] The sound barrier is a facility inserted between the sound source and the receiver, so that the sound wave spreads a significant additional attenuation, thereby weakening the noise effect in a certain area where the receiver is located. [0003] The sound absorbing material used in high -speed rail sound barrier is first of all, its sound absorption performance must meet the requirements of the sound barrier structure design requirements, and its noise reduction coefficient NRC> 0.5; as an outdoor sound absorption material, it should also have good mechanical performance and weather resistance, Can not only bear the joint effects of train gas and wind load, but also to be able to withstand wind and rain, sun exposur...

AI Technical Summary

Problems solved by technology

Acoustic panels made of these materials are not easy to process and can irritate the skin

Therefore, its application is also limited

In addition, organic foam materials have also been used for sound barriers, but they have been gradually withdrawn due to poor fire resistance and low strength.

[0004] The sound barrier research has not only made great progress in the selection of material properties, but also in-depth research on the sound barrier structure. The existing sound barrier structures mostly use a single metal material or inorganic non-metallic material structure, and the layout is not based on the high-speed railway. The design is based on the characteristics, and the installation and fixed structure did not further consider the needs of on-site construction, nor did it combine the continuous development of new materials for comprehensive technical exploration to meet the higher requirements of noise control.

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