Highway Noise Barrier Principles and Types

　　Highway Noise Barrier Principle

　　Generally speaking, highway noise barriers can reduce high-frequency noise by 10~15 dB. The height of the noise barrier can be planned according to the distance from the sound source to the receiving point. Assuming the barrier height is doubled, the noise reduction can increase by 6dB. To improve the noise reduction effect of the noise barrier, it should be placed as close as possible to the sound source or receiving point.

　　Highway noise barriers can block the linear propagation of sound, allowing diffracted sound to be sufficiently attenuated, but their effect on propagating sound can be ignored. When the barrier is pierced between the sound source and the receiving point, and the barrier is infinitely long, sound waves can only scatter from above the obstacle, forming a sound shadow zone, similar to how light is blocked by an object, forming a shadow.

　　What standards should be followed for the use of highway noise barriers?

　　A noise barrier is a device inserted between a sound source and a receiver, the purpose of which is to block the direct sound between the sound source and the receiver. It causes significant additional attenuation of sound wave propagation, thereby reducing the noise impact in a certain area where the receiver is located. With the advancement of the times, the rapid increase in the number of motor vehicles in cities, and the rapid development of traffic arteries, traffic noise has increasingly become the main noise in cities. Traffic noise mainly refers to the noise generated by motor vehicles traveling on major urban traffic arteries.

　　The structure of the highway noise barrier should be neat and reasonable, easy to install, maintain, and repair. The sound absorption and sound insulation effect of the road noise barrier should meet the requirements of environmental noise management in this area. The setting of the road noise barrier should be coordinated with the surrounding environment and landscape, and it should be organically connected with existing road equipment without adversely affecting the structure and function of the road and its auxiliary equipment.

　　When a highway noise barrier is located near electrical equipment, in addition to meeting safety spacing regulations, reliable protective measures should also be in place. The anti-corrosion treatment of the highway noise barrier screen and components should meet the requirements of rainproof, moisture-proof, mildew-proof, and anti-glare, and meet the durability requirements under white conditions in the region.

　　Types of Highway Noise Barriers

　　There are many different types of noise barriers, such as upright, articulated, and curved types. Road noise barriers are usually curved noise barriers. Why is this? The style of the road noise barrier directly affects the noise reduction effect of the noise barrier.

　　To improve the noise reduction effect of the noise barrier, the noise barrier shape often adopts a curved shape. Curved noise barriers can be divided into large and small arcs. There are three shapes and noise barriers with top bending. The highway's arc-shaped noise barrier is a large arc formed by the pillars and the screen.

　　This type of noise barrier is expensive and has high technical requirements. A small curved noise barrier is a slightly curved screen body and pillar, with a curvature of less than 45 degrees, and the screen body is processed using a one-time molding die, resulting in a good sound absorption effect.

　　The top is an arc-shaped noise barrier. When noise passes through the top, the sound will diffract, thereby improving the noise reduction effect. The road noise barrier is based on a vertical noise barrier, with a curved pillar at the top and a small arc screen body, making the overall shape rather special.

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