Light efficient sound absorption type metal sound barrier body

Abstract

The invention relates to the technical field of urban traffic noise control, and discloses a light efficient sound absorption type metal sound barrier body which comprises an outer frame and an aluminum fiberboard sound absorption structural body arranged at the end, away from a screen body back plate, of the outer frame. The cavity is formed between the aluminum fiberboard sound absorption structural body and the screen body back plate. According to the light efficient sound absorption type metal sound barrier body, the screen body frame is made of a high-strength aluminum alloy material, the dead weight of the screen body can be greatly reduced, the bearing pressure of the screen body on a bridge is reduced, the principle of a cavity resonance structure sound absorber is utilized, a 30 mm aluminum fiber board sound absorption structure is designed and embedded in the front portion of the screen body, and the sound absorption effect is good. Noise sound waves enter the sound absorber to cause vibration of the aluminum fiber board, so that sound wave energy is converted into heat energy, the sound waves enter the rear cavity of the screen body for further energy attenuation after traffic noise is reduced, and the effect of absorbing the traffic noise is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of urban traffic noise control technology, and in particular to a lightweight and highly efficient sound-absorbing metal sound barrier screen body. Background Art

[0002] The urban elevated expressway adopts a three-dimensional layout, which can improve the rapid passing ability of vehicles. It is one of the important signs of urban modernization. Affected by the constraints of urban planning and space limitations, the construction of urban elevated expressways will bring traffic noise to residents along the line. The conventional method of dealing with this is to set a metal sound barrier on the concrete guardrail outside the bridge. The urban elevated expressway adopts a three-dimensional layout, which can improve the rapid passing ability of vehicles. It is one of the important signs of urban modernization. Affected by the constraints of urban planning and space limitations, the construction of urban elevated expressways will bring traffic noise to residents along the line. The conventional method of dealing with this is to set a metal sound barrier on the concrete guardrail outside the bridge.

[0003] Through investigation and testing, it was found that some of the existing sound barriers in use have disadvantages such as heavy weight, insufficient noise reduction effect on medium and high-frequency traffic noise on urban elevated roads, and the sound-absorbing materials inside the screen body are easily contaminated and compacted, resulting in the noise reduction effect of the sound barriers failing to reach the expected design value. Summary of the invention

[0004] The present invention is proposed in view of the fact that some of the above-mentioned sound barriers currently in use have disadvantages such as heavy weight, insufficient noise reduction effect on high-frequency traffic noise on urban elevated roads, and easy contamination and compaction of sound-absorbing materials inside the screen body, resulting in the noise reduction effect of the sound barrier failing to reach the expected design value.

[0005] Therefore, the purpose of the present invention is to provide a lightweight and efficient sound-absorbing metal sound barrier screen, which aims to have a good sound absorption effect in the medium and high frequency bands of traffic noise, and on this basis, simultaneously adopt lightweight materials to reduce its bearing pressure on the bridge foundation.

[0006] In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions: a lightweight and high-efficiency sound-absorbing metal sound barrier screen, comprising an external frame, a screen back panel arranged at one end of the external frame, and an aluminum fiberboard sound-absorbing structure arranged at the end of the external frame away from the screen back panel, the aluminum fiberboard sound-absorbing structure comprising a back panel arranged at the end of the external frame away from the screen back panel, an aluminum fiberboard arranged at the end of the back panel away from the external frame, a panel arranged at the end of the aluminum fiberboard away from the back panel, and a cavity formed between the aluminum fiberboard sound-absorbing structure and the screen back panel.

[0007] As a preferred solution of the lightweight and efficient sound-absorbing metal sound barrier screen body described in the present invention, the total thickness of the aluminum fiberboard sound-absorbing structure is 30 mm, and the thickness of the cavity is 70 mm.

[0008] As a preferred solution of the lightweight and efficient sound-absorbing metal sound barrier screen body described in the present invention, the panel and back panel are made of high-strength aluminum plate with a thickness of 1 mm.

[0009] As a preferred solution of the lightweight and efficient sound-absorbing metal sound barrier screen body described in the present invention, the front panel and the back panel are both made of micro-perforated plates, the front panel has circular holes with a diameter of 2 mm, the back panel has circular holes with a diameter of 1 mm, and an aluminum fiberboard with a thickness of 20 mm is arranged between the front panel and the back panel.

[0010] As a preferred solution of the lightweight and efficient sound-absorbing metal sound barrier screen body described in the present invention, the thickness of the aluminum fiberboard is 0.8 mm, and the aluminum fiberboard adopts an equilateral triangle structure design with a side length of 8 mm.

[0011] As a preferred solution of the lightweight and high-efficiency sound-absorbing metal sound barrier screen body described in the present invention, the external frame and the screen body back panel are composed of 1 mm thick high-strength aluminum plate.

[0012] The beneficial effects of the present invention are as follows: the use of high-strength aluminum alloy material as the screen frame can greatly reduce the deadweight of the screen and reduce its bearing pressure on the bridge. By utilizing the principle of the cavity resonance structure sound absorber, a 30mm aluminum fiberboard sound absorbing structure is designed and embedded in the front of the screen. After the noise sound wave enters the sound absorber, it causes the vibration of the aluminum fiberboard, converting its sound wave energy into heat energy, and after reducing the traffic noise, it enters the rear cavity of the screen for further energy attenuation, thereby achieving the effect of absorbing traffic noise. Through the optimization design of the thickness of the sound absorbing structure, the aluminum fiberboard material and the internal cavity structure, the sound absorption effect of traffic noise within 400-2000Hz can be maintained at a high level. At the same time, the barrier screen is made of aluminum materials, with a light overall deadweight and strong corrosion resistance. It can be directly washed, and there is no problem of the sound absorbing material being hardened after being polluted by water and dust, which affects the sound absorption effect. The service life is long, and the economy of the sound barrier can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0014] in:

[0015] Figure 1 It is a schematic diagram of the elevation structure of the lightweight and efficient sound-absorbing metal sound barrier screen body of the present invention.

[0016] Figure 2 It is a schematic diagram of the top view of the structure of the lightweight and efficient sound-absorbing metal sound barrier screen body of the present invention.

[0017] Figure 3 It is a schematic diagram of the panel structure of the lightweight and efficient sound-absorbing metal sound barrier screen body of the present invention.

[0018] Figure 4 It is a schematic diagram of the panel structure of the lightweight and efficient sound-absorbing metal sound barrier screen body of the present invention.

[0019] Figure 5 This is a schematic diagram of the sound-absorbing material structure of the aluminum fiberboard of the lightweight and high-efficiency sound-absorbing metal sound barrier screen body of the present invention.

[0020] Figure 6 This is a schematic diagram of the back panel structure of the lightweight and efficient sound-absorbing metal sound barrier screen of the present invention.

[0021] Figure 7 This is a test chart of the sound absorption coefficient of the lightweight and efficient sound absorbing metal sound barrier screen of the present invention.

[0022] Description of reference numerals:

[0023] 1. External frame; 11. Screen back panel; 2. Aluminum fiberboard sound-absorbing structure; 21. Aluminum fiberboard; 22. Panel; 23. Back panel; 3. Cavity. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Reference Figure 1-7, is an embodiment of the present invention, providing a lightweight and efficient sound-absorbing metal sound barrier screen body, the lightweight and efficient sound-absorbing metal sound barrier screen body comprises an external frame 1, a screen back plate 11 arranged at one end of the external frame 1, the external frame 1 and the screen back plate 11 are composed of a 1mm thick high-strength aluminum plate, and can be sprayed into different colors according to design requirements, an aluminum fiberboard sound-absorbing structure 2 is arranged at the end of the external frame 1 away from the screen back plate 11, and a clamp is arranged inside the external frame 1 to fix the aluminum fiberboard sound-absorbing structure 2 and the external frame 1, the aluminum fiberboard sound-absorbing structure 2 includes a clamp arranged at the end of the external frame 1 away from the screen back plate 11 A back panel 23 away from one end of the screen back panel 11, an aluminum fiberboard 21 arranged at one end of the back panel 23 away from the external frame 1, a panel 22 arranged at one end of the aluminum fiberboard 21 away from the back panel 23, the panel 22 and the back panel 23 are made of high-strength aluminum plate and have a thickness of 1 mm, and a cavity 3 formed between the aluminum fiberboard sound-absorbing structure 2 and the screen back panel 11, the total thickness of the aluminum fiberboard sound-absorbing structure 2 is 30 mm, the thickness of the cavity 3 is 70 mm, and the aluminum fiberboard sound-absorbing structure 2 is mainly designed for the urban elevated bridge traffic noise frequency band of 600-2000Hz, and can also be adjusted accordingly according to actual noise characteristics.

[0027] By adopting the cavity resonance principle and not filling sound-absorbing cotton, the risk of the sound-absorbing material becoming hardened and deteriorating due to the entry of dust and rainwater can be effectively prevented, which can greatly increase the service life of the screen and improve its economy.

[0028] Both the panel 22 and the back panel 23 are made of micro-perforated plates. The panel 22 uses circular holes with a diameter of 2 mm, and the back panel 23 uses circular holes with a diameter of 1 mm. An aluminum fiber board 21 with a thickness of 20 mm is arranged between the panel 22 and the back panel 23. The thickness of the aluminum fiber board 21 is 0.8 mm. The aluminum fiber board 21 adopts a regular triangle structure design with a side length of 8 mm. The aluminum fiber board 21 is physically fixed to the panel 22 and the back panel 23 with rivets.

[0029] Working principle of the present invention: When traffic noise diffuses to the screen, it first contacts the panel 22 and enters the aluminum fiberboard sound-absorbing structure 2. The noise in the medium and high frequency bands is reduced by the vibration caused by the aluminum fiberboard 21 arranged in the aluminum fiberboard sound-absorbing structure 2. At the same time, the noise energy is further reduced by the difference in aperture design between the micro-perforated panel 22 and the back panel 23 of the aluminum fiberboard sound-absorbing structure 2. After the sound enters the cavity 3, it further consumes the sound energy through reflection, absorption, and re-reflection, thereby achieving the effect of efficient sound absorption. In addition, the back panel is made of high-strength aluminum plate, which can also block the penetration of part of the sound energy, such as Figure 7 As shown, through indoor test detection, the screen material of the present invention can maintain the sound absorption coefficient of traffic noise in the frequency band of 400-2000Hz above 0.8, and the effect is good.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A lightweight and highly efficient sound-absorbing metal sound barrier screen, characterized in that: The invention comprises an external frame (1), a screen back plate (11) arranged at one end of the external frame (1), an aluminum fiberboard sound absorbing structure (2) arranged at one end of the external frame (1) away from the screen back plate (11), the aluminum fiberboard sound absorbing structure (2) comprising a back plate (23) arranged at one end of the external frame (1) away from the screen back plate (11), an aluminum fiberboard (21) arranged at one end of the back plate (23) away from the external frame (1), a panel (22) arranged at one end of the aluminum fiberboard (21) away from the back plate (23), and a cavity (3) formed between the aluminum fiberboard sound absorbing structure (2) and the screen back plate (11).

2. The lightweight and highly efficient sound-absorbing metal sound barrier screen according to claim 1 is characterized by: The total thickness of the aluminum fiberboard sound-absorbing structure (2) is 30 mm, and the thickness of the cavity (3) is 70 mm.

3. The lightweight and highly efficient sound absorbing metal sound barrier screen according to claim 1 is characterized by: The front panel (22) and the back panel (23) are made of high-strength aluminum plates and have a thickness of 1 mm.

4. The lightweight and highly efficient sound-absorbing metal sound barrier screen according to claim 3 is characterized by: The panel (22) and the back panel (23) are both made of micro-perforated plates, the panel (22) has circular holes with a diameter of 2 mm, the back panel (23) has circular holes with a diameter of 1 mm, and an aluminum fiberboard (21) with a thickness of 20 mm is arranged between the panel (22) and the back panel (23).

5. The lightweight and highly efficient sound-absorbing metal sound barrier screen according to claim 4 is characterized by: The aluminum fiber board (21) has a thickness of 0.8 mm and is designed in the shape of an equilateral triangle with a side length of 8 mm.

6. The lightweight and highly efficient sound-absorbing metal sound barrier screen according to claim 1 is characterized by: The external frame (1) and the screen back plate (11) are made of a 1 mm thick high-strength aluminum plate.

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