Do you know which types of materials are used for sound barriers?

Sound barriers are mainly used for sound insulation and noise reduction in highways, expressways, elevated composite roads, and other noise sources. Inserting a facility between the sound source and receiver to significantly attenuate the propagation of sound waves, thereby reducing the noise impact within a certain area where the receiver is located, is called a sound barrier. There are various types, materials, and styles, what have you seen?

1、 Metal or metal transparent material hybrid sound barrier

Metal sound barriers or hybrid sound barriers are generally assembled from multiple steel column frames with "H" - shaped grooves and multiple sound absorbing and insulating unit panels. Sound absorbing and insulating unit panels are installed in the "H" - shaped grooves of two adjacent steel column frames.

The metal soundproof screen is composed of punched plates, backboards, keel brackets, soundproof cotton, waterproof cloth, etc.

A hybrid sound barrier generally refers to a sound barrier made of a mixture of metal and transparent parts. The metal part can be made of colored steel plates, galvanized plates, aluminum alloy plates, and other sheet materials, while the transparent part can be made of PC endurance plates, acrylic plates, or laminated tempered glass. Any material combination can be used.

Highway sound barriers have a significant effect on reducing noise, and now sound barriers are often installed in commercial and residential areas with high traffic noise to reduce it. Provide a quiet environment for people's lives, work, and studies. Moreover, the sound barrier function now not only considers noise reduction, but also takes into account the landscape effect along the road. In order not to damage the surrounding environment, there are various forms of sound barrier design functions to meet different needs.

2、 Ecological sound barrier

Ecological sound barrier screen is the fastest growing form of screen in the field of highway and railway sound barriers in recent years. Its characteristics include outstanding sound insulation performance, weighted sound insulation ≥ 40dB; Lightweight, with a surface density of around 50-80kg/㎡; Belonging to energy-saving and environmentally friendly products; Good fire resistance and corrosion resistance.

1. Cement sawdust sound barrier

Cement sawdust sound barrier is a high-performance cement-based soundproof board made by using Portland cement as the bonding material, wood shavings (or plant fibers such as cotton stalks, hemp stalks, bean stalks, straw, etc.) as the reinforcing material, adding water and chemical additives, and undergoing mixing, air flow paving, laminating, steam curing, and manual drying processes.

2. Composite sound-absorbing barrier for waste tires

(1) Materials and Structure: The main components are composed of two acoustic materials: cement concrete compression panels and waste tires. Cut the waste car tires (or bicycle tires) along the tread, divide them in half, and then fix several processed placenta in a cake shape inside the sound barrier box. Fill the gaps with fiberglass wool or porous sound-absorbing material. The panel facing the highway traffic sound source is made of perforated cement concrete pressure plates, with holes allowing sound energy to penetrate into the box. The back panel is insulated with 10mm cement concrete pressure plates, and has a stable structure and beautiful appearance. The bracket for the screen can be made of prefabricated reinforced concrete columns or H-shaped steel columns, embedded in cement reinforced steel dug pile foundations to fix the screen body and ensure its firmness, safety, and durability

(2) Characteristics of composite sound-absorbing barrier for waste tires

a. Good sound absorption in the mid to low frequency range, with an average absorption coefficient of up to 0.62;

b. The main raw material prices are low and easy to produce, making the price of sound barriers relatively cheap;

c. Compressive strength ≥ 4 MPa, flexural strength ≥ 2.5 MPa;

d. Waste tires are packed in boxes, which are not easy to catch fire and have a fire rating of B1 or above;

e. Acid rain resistance, moisture resistance, corrosion resistance, and freeze-thaw resistance, with a service life of over 15 years;

f. Easy to maintain, no need for manual maintenance

3. Vertical concrete sound barrier

1) Materials and structural materials: precast concrete columns, precast concrete slabs. Planting green plants before and after to increase the coordination of the landscape. According to research data, the sound insulation of 10 cm thick precast concrete blocks reaches 33 dB, and the material also has good fire resistance with a service life of over 20 years. Both acoustic performance and safety considerations can meet the requirements of these two sound barriers. At the same time, it has low cost and can be recycled, belonging to the composite ecological sound barrier.

2) Characteristics of inclined earth embankment sound barrier

a. Earth embankments have good sound insulation effects and are cost-effective, demonstrating outstanding performance in terms of landscape, greenery, and economy.

b. The land area is too large and only suitable for mining on specific road sections.

c. The maintenance cost in the later stage is relatively high, vegetation is prone to withering, and soil erosion is easy.

4、 Solar photovoltaic sound barrier

1. Materials and Structure

Materials: The solar sound barrier test section mainly consists of the following parts: (1) solar panels, (2) lighting components (electric light source and its accessories), (3) control box (battery+control components), (4) data collection and acquisition system.

Structure: The solar sound barrier is installed on the basis of the original sound barrier, and the structural design mainly focuses on the following aspects: (1) the deflection of the solar panel bracket and H-shaped steel column under the standard combination of self weight and wind load; (2) Bending and shear strength, stability verification of solar panel brackets and H-shaped steel columns under basic combination of self weight and wind load; (3) Verification of pull-out resistance of chemical anchor bolts.

5、 Landscape sound barrier

Landscape sound barrier is a type of sound barrier, whose main function is to add artistic design to the sound barrier itself on the basis of sound insulation and noise reduction, making it conform to the cultural concepts of the current city or urban area, and promoting a certain spirit. Or it can become an independent scenic line, which not only effectively solves urban noise, but also contributes to the beauty of the city.

6、 Masonry cultural wall type sound barrier

(1) The material and structure of the sound barrier screen are made of homemade porous brick blocks used in local residential construction. The columns and strip foundations are constructed with reinforced silicon steel. The surface of the screen is made of sound-absorbing cultural stone material, which is not only beautiful and practical, but also has a strong local flavor and blends seamlessly with the local landscape. The sound barrier adopts an upright type with a top pressing treatment. The main body of the masonry wall is 3m high, and the thickness of the screen is 0.1m. On site pouring of strip foundations and structural columns, with a width of 0.5 meters. The sound barrier fully incorporates local folk cultural elements, achieving a perfect combination of natural and cultural landscapes, and has excellent landscape effects; From an environmental perspective, the materials used for sound barriers are mainly concrete and brick blocks made from waste, which have certain positive benefits for the environment. From an economic perspective, the materials for sound barrier screens are abundant, inexpensive, have short transportation distances, are easy to construct, and have low construction costs. At the same time, as a unique cultural landscape along the highway, the sound barrier can stimulate tourists' interest in the folk culture of the construction site, promote the development of the tourism industry in the region, and have potential huge economic benefits.

(2) Characteristics of Masonry Cultural Wall Sound Barrier

a. Concrete prefabricated blocks have good sound insulation, low material cost, and can be recycled, which is in line with ecological sound barriers.

b. This material also has good fire resistance and a service life of over 20 years.

c. This cultural wall has a certain sound-absorbing effect, which is both beautiful and practical, and also has a strong local flavor, integrating with the local landscape.