Foamed aluminum substrate sound barrier of U-shaped beam of metro

Abstract

The invention discloses a foamed aluminum substrate sound barrier of a U-shaped beam of metro and is mainly used for absorbing sounds and reducing noises for U-shaped beam of metro. The sound barrier comprises a top supporting piece and a bottom supporting piece which are fixed to two sides of the U-shaped beam of a metro track as well as a sound absorbing plate, a pressure plate and a vertical supporting piece which are arranged therebetween. The supporting piece is Z-shaped, a mounting groove which extends outward and is opened downward is formed in the upper portion of the supporting piece, and a supporting leg which extends outward is arranged in the lower portion. The sound absorbing plate is a double-sided fluorocarbon sprayed foam aluminum plate of a through hole structure, the thickness of which is greater than or equal to 5mm, the coating thickness of which is greater than or equal to 40mu m, the porosity of which is 55-65%, the average pore diameter is less than or equal to 0.7mm and the sound absorbing coefficient NRC is greater than or equal to 0.75; the sound absorbing plate is a cambered surface, a concave surface of which faces the direction of a metro locomotive, and the radius dimension of the cambered surface is 1990-2200mm, preferably 2066mm. The sound barrier can prevent noises from overflowing, is convenient to mount, and not only is convenient for field installation and construction, but also is convenient for rectification and detachment.

Description

technical field [0001] The invention relates to the technical field of rail transit sound barrier devices, in particular to a subway U-shaped beam sound barrier device using a novel foamed aluminum base material. Background technique [0002] The sound barrier refers to inserting a facility between the sound source and the receiver, so that the sound wave propagation has a significant additional attenuation, thereby reducing the impact of noise in a certain area where the receiver is located. It can be divided into two types, the reflective sound barrier of pure sound insulation and the composite sound barrier of sound absorption and sound insulation. In comparison, the effect of the latter is more effective. [0003] With the rapid development of the economy, urban rail transit, especially the subway, has become the preferred mode of public transportation in big cities due to its convenience, speed, and punctuality. Dozens of big cities in China have built or are building s...

AI Technical Summary

Problems solved by technology

It mainly uses the hollow structure formed between the sound-absorbing panel and the back panel to achieve low-frequency sound-absorbing ability, but the material of the sound-absorbing panel itself is brittle, the sound-absorbing performance is poor, and the manufacturing process is too complicated, which is not conducive to on-site installation

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