Ningbo CCMS Industrial Co. Ltd , https://www.ccmcmachiningparts.com
Highway sound barrier products have been widely used in major highways in China in recent years. How much noise reduction can the road sound barrier achieve? How much can the people next to the installation of the sound barrier benefit?
There are four types of common road sound barriers. The first type is a metal perforated sound barrier. This kind of sound barrier is economical and suitable for use in highways, community school hospitals, and practical sound insulation and noise reduction products when there is a certain distance from the noise source. Its advantage is that the sound absorbing effect is good and the rainproof performance is good. The disadvantage is that the sound with a large opening ratio cannot be completely absorbed.
The second type of PC transparent board sound barrier, which is mainly applied to the bridge section, has the advantage of high transparency and is good for the driver's line of sight. The disadvantage is that it is only a soundproof board and cannot absorb sound.
The third type is a combination of metal material and transparent plate sound barrier. The advantages of this combined road sound barrier are aesthetics, generosity, good sound insulation and good light transmission performance. The disadvantage is that the cost is slightly higher.
The fourth type is the FRP sound barrier: the panel and the orifice plate are made of FRP, and the ultra-fine glass wool board is wrapped with the alkali-free water-repellent glass cloth. The weighted sound insulation Rw=30——38dB(A), and the sound absorption coefficient NRC=0.80——0.90. The disadvantage is: poor fire protection.
There are many factors affecting the noise reduction of road sound barriers, such as: sound barrier height and overall length, sound barrier installation position, sound barrier style, road sound barrier material and so on.
1. The length of the road sound barrier cannot be exactly the same as the width of the receptor. It is necessary to extend the length of the distance between the left and right sides by four times the distance of the near receptor to prevent the sound from flowing into the receptor from both ends. The sound insulation is proportional to the height of the soundproof wall. According to the relevant information, for every 1 meter increase in the soundproof wall, it will be able to reduce the noise by 1.5 decibels. Studies have shown that if the noise can be reduced by 10 decibels, the intensity of the noise that people hear can be reduced by half; but the height cannot be too high, too high will increase the cost, and the top structure of the sound barrier can be properly installed.
2. The horizontal position of the road sound barrier should be as close as possible to the sound source, which is beneficial to increase the shadow area of ​​the barrier, thereby improving its sound attenuation. Under other conditions, the shadow area of ​​the sound barrier when it is closer to the sound source is larger than the distance from the sound source. The horizontal position of the sound barrier should be as close as possible to the sound source, which helps to increase the shadow area of ​​the barrier, thereby improving its sound attenuation. Under other conditions, the shadow area of ​​the sound barrier when it is closer to the sound source is larger than the distance from the sound source.
3. The form of the road sound barrier also has a great influence on the effect of sound attenuation. At present, the common sound barrier styles are upright, curved (large arc, small arc, top arc), closed tilt type, and closed type;
The effect of the road sound barrier is not determined by its materials and structure, but also by its spatial location, geometry, and size. Therefore, the user cannot merely focus on the material and structure of the barrier. Attention should also be paid to the overall design of the road sound barrier.