Construction Noise Barrier Cancelling Walls Sound Proof Fence Sound Barrier

Qingdao Taicheng Transportation Facilities Co., Ltd

The first manufacturer of exporting new type roller barriers in China

Qingdao Taicheng Transportation Facilities Co., Ltd. is a technological innovation enterprise invested by Henger Group. Its headquarters is located in Jinkou Industrial Park, Qingdao. Taicheng Transportation has an innovative scientific research team, advanced manufacturing technology, first-class production facilities, and perfect testing methods. , reliable product quality, enthusiastic after-sales service, devoted to the great cause of improving China's road safety.

Sound barrier definition

A sound barrier is a soundproofing facility. A dense material panel or wall with sufficient surface density is inserted vertically between the sound source and the receiving point, so that there is a significant additional attenuation in the transmission of sound waves. Such an "obstacle" is called a sound barrier.

In order to block the direct sound between the sound source and the receiver, a facility is inserted between the sound source and the receiver, so that the sound wave propagation has a significant additional attenuation, thereby reducing the noise impact in a certain area where the receiver is located.

Sound barriers are primarily used outdoors. As road traffic noise pollution becomes increasingly serious, some countries use various forms of barriers to reduce traffic noise. In buildings, if the requirements for sound insulation are not high, barriers can also be used to separate workshops and offices. The barrier is easy to disassemble, assemble and move, and has a certain sound insulation effect, so it is widely used.

The function of a sound barrier is to prevent the propagation of direct sound, isolate transmitted sound, and provide sufficient attenuation of reflected sound. Therefore, the sound insulation attenuation of the sound barrier is designed using the principle of sound wave reflection. When sound waves encounter obstacles (sound barriers) during propagation, they will be reflected, forming a "sound shadow area" within a certain distance behind the obstacle. The size of the area depends on the size of the sound (i.e. frequency). ), it can be seen from this point that the sound insulation attenuation of the sound barrier is closely related to each center frequency value.

Structure

Outdoor sound insulation barriers generally use brick or concrete structures, and indoor sound insulation barriers use structures such as steel plates, wooden boards, PMMA/POLYCARBONATE SHEET plastic pans, gypsum boards, and foam aluminum. The sound insulation barrier mainly consists of two parts: steel structure columns and sound-absorbing sound insulation screens. The column is the main stress-bearing component of the sound insulation barrier. It is fixed to the road anti-collision wall or the embedded steel plate beside the track through bolts or welding. The sound-absorbing board is the main sound-insulating and sound-absorbing component. It is fixed in the H-shaped column groove through high-strength spring clips to form a sound barrier. The design of the sound barrier has fully considered the wind load of elevated highways, urban light rails, and subways, the impact safety of traffic vehicles, and all-weather open-air anti-corrosion issues. It has beautiful appearance, exquisite production, convenient transportation and installation, low cost and long service life. It is especially suitable for noise prevention on elevated highways, urban light rails and subways. It is the most ideal sound insulation and noise reduction facility in modern cities.

The height of the sound barrier is between 1m and 5m, and the average noise reduction in the effective area covered is 10-15dB (125Hz-4000Hz, 1/3 octave), and the maximum is 20dB. Generally speaking, the higher the sound barrier, or the further away from the sound barrier, the better the noise reduction effect.

Sound barriers are usually designed to target a specific sound source and protect a specific location (or area).

Sound barriers are mainly used for sound insulation and noise reduction on roads, expressways, elevated composite roads and other noise sources. They are divided into reflective sound barriers that are pure sound insulation, and composite sound barriers that combine sound absorption and sound insulation. The latter is a more effective sound insulation method. It refers to wall structures installed beside railways and highways to reduce the impact of traffic noise on nearby residents. Soundproof walls are also called sound barriers. A facility is inserted between the sound source and the receiver to cause a significant additional attenuation of the sound wave propagation, thereby reducing the noise impact in a certain area where the receiver is located. Such a facility is called a sound barrier. They are divided into traffic noise barriers, equipment noise attenuation noise barriers, and industrial factory boundary noise barriers. Roads and expressways are the places where most types of sound barriers are used.

When sound waves encounter a sound barrier during propagation, reflection, transmission and diffraction will occur. Usually the barrier can prevent the propagation of direct sound and provide sufficient attenuation of transmitted sound, while the influence of transmitted sound can be ignored. Therefore, the sound insulation effect of a sound barrier can generally be expressed in terms of noise reduction, which reflects the above two abilities of the sound barrier to shield sound. Insert a sound barrier between the sound source and the receiving point. If the barrier is infinitely long, the sound waves can only be diffracted from above the barrier and form a sound shadow area behind it, just like the light is blocked by an object and forms a shadow. In this sound shadow area, people can feel that the noise is significantly reduced. This is the noise reduction effect of the sound barrier.

Sound insulation method

The amount of noise reduction achieved by a sound barrier is related to factors such as the frequency of the noise, the height of the barrier, and the distance between the sound source and the receiving point. The noise reduction effect of the sound barrier is closely related to the frequency component of the noise. The noise reduction effect is better for high-frequency sounds greater than 2000Hz than for medium-frequency sounds around 200-800Hz. But for low-frequency sound around 25Hz, the sound wave wavelength is relatively long and can easily be diffracted from above the barrier, so the effect is poor. Generally, sound barriers can reduce high-frequency sounds by 10-15dB. The height of the sound barrier can be designed based on the distance between the sound source and the receiving point. If the height of the barrier is doubled, its noise reduction capacity can be increased by 6dB. In order to make the noise reduction effect of the barrier better, the barrier should be placed as close to the sound source or receiving point as possible.

Application scope

Sound barriers are mainly used along railways and highways.

Sound barriers are mainly used for sound insulation and noise reduction in transportation and municipal facilities such as expressways, elevated composite roads, urban light rail subways, and to control the impact of traffic noise on nearby urban areas. They can also be used for sound insulation and noise reduction in factories and other noise sources.

Sound barriers are divided into reflective sound barriers that are pure sound insulation, and composite sound barriers that combine sound absorption and sound insulation. The latter is made of more effective sound insulation. Most sound barriers use a combination of sound absorption and sound insulation products, which are characterized by targeted control of the generation and transmission characteristics of road noise. For example, the sound of friction between a car and the road or the friction between a locomotive and the track is in the lower part of the road, and the sound has the characteristic of diffracting through the upper part of the screen. Therefore, the design adopts a structure with sound absorption up and down and sound isolation in the middle, which can effectively reduce the diffraction of noise; a transparent reflective sound insulation board is used in the middle of the sound barrier, which can effectively interrupt the propagation path of sound waves. It also provides drivers and residents with a broad vision environment. In the field of architectural acoustics, through acoustic management, the reverberation time and indoor acoustic environment are controlled to meet the requirements of professional venues.