High-speed rail sound barrier top end noise reduction device

Abstract

The application belongs to the technical field of sound barriers, and discloses a sound barrier top end noise reduction device, which comprises a base, a bottom plate, a vertical plate and an inclined plate. The base is provided with a groove and can be mounted on the sound barrier body to connect the sound barrier body and the top end structure. The bottom plate is fixed to the base and is provided with grooves for mounting the inclined plate and the vertical plate. The vertical plate is mounted at the middle position of the bottom plate. The inclined plates are uniformly distributed on the bottom plate, are obliquely mounted, intersect with the vertical plate and form a comb-tooth structure. The outer edges of the vertical plate and the inclined plate are provided with rectangular tooth structures. The comb-tooth structure formed by the inclined plates and the tooth structures of the edges of the vertical plate and the inclined plate can weaken the propagation of aerodynamic noise, improve the sound field at the top of the sound barrier when the train passes at high speed, greatly weaken the sound wave energy propagated to the rear side of the sound barrier, thereby improving the noise reduction effect of the high-speed rail sound barrier. The width of the whole device can be equivalent to the width of the sound barrier body, the quality is light, and the device has good applicability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sound barriers, and particularly relates to a high-speed rail sound barrier top end noise reduction device. BACKGROUND

[0002] The construction of high-speed rail has made a great contribution to the development of China's economy and society, and the environmental noise control along the high-speed rail has also been extensively studied and concerned. Sound barriers are indispensable devices for controlling traffic noise pollution and have been widely used around the world. Sound barriers can effectively block direct sound, but cannot avoid diffraction sound. Diffraction sound will weaken the protection effect of sound barriers and reduce the effect of sound barriers. In order to improve the acoustic protection effect of sound barriers, reducing diffraction sound has always been a technical problem that needs to be addressed. Installing a top end noise reduction device on the top of the sound barrier can change the sound field at the top of the sound barrier, which is considered an effective measure to reduce diffraction sound. Based on this, top end devices with acoustic performance have been developed and applied.

[0003] At the current stage, most top end devices can be classified into two categories: additional mechanism type and structure type. Typical noise reduction mechanisms include sound absorption, interference, phononic crystals based on Bragg scattering, active control, etc., and typical structures include T-type, Y-type, cylindrical type, etc. The commonly used top end devices can basically meet the noise reduction requirements in most scenarios through optimization of material parameters and topological optimization of structure parameters. However, the noise along the high-speed rail is significantly different from the traffic noise along ordinary roads. The main differences are as follows: first, the characteristics of the sound source are different; second, the requirements for the sound barrier are different. In terms of sound source, high-speed trains produce aerodynamic noise when running at high speed, and the propagation mechanism and control method of aerodynamic noise are different from those of ordinary sound sources. In terms of requirements for sound barriers, high-speed train lines generally pass through a large number of viaducts and bridges, and there are clear numerical limits on the carrying capacity of viaducts and bridges. Therefore, there are strict requirements for the weight of sound barriers, which are different from the requirements for ordinary sound barriers.

[0004] The existing sound barrier top end noise reduction devices usually have a large size to ensure good acoustic performance, and the overall width of the device is often several times the width of the screen body, and the aerodynamic characteristics when the train passes through are rarely considered. Therefore, it is an important technical requirement to develop a sound barrier top end noise reduction device that is suitable for controlling high-speed train aerodynamic noise and suitable for application in bridges, viaducts and other places. SUMMARY

[0005] The purpose of the present application is to provide a high-speed rail sound barrier top end noise reduction device that can effectively improve the sound field at the top of the sound barrier, enhance the control of high-speed train aerodynamic noise, improve the overall noise reduction effect of the high-speed rail sound barrier, and at the same time have a relatively narrow overall width and a small mass, suitable for use in bridges, viaducts and other sections of the high-speed rail line.

[0006] To achieve the object of the present application, the technical scheme adopted by the present application is: a high-speed rail sound barrier top end noise reduction device, comprising a base, a bottom plate, a vertical plate and an inclined plate; the base is a groove structure and is installed at the top end of the sound barrier body; the bottom plate is fixedly installed with the base, and simultaneously has a groove for installing the vertical plate and the inclined plate on the bottom plate; the vertical plate is installed in the middle of the bottom plate, and the top end of the vertical plate has a rectangular tooth structure; the inclined plates are installed on the bottom plate at equal intervals and cross the vertical plate to form a comb-tooth structure, and the top end and both sides of the inclined plate have a rectangular tooth structure.

[0007] Compared with the prior art, the present application has the following beneficial effects:

[0008] The comb-tooth structure formed by the inclined plate and the vertical plate can change the propagation path of the sound wave at the top end, improve the sound field at the top end, and weaken the diffraction sound propagating to the protected area. When the high-speed train running noise propagates to the surface of the inclined plate, due to the inclination angle of the inclined plate during installation, a part of the sound wave will be reflected, and the reflected wave will still propagate on the sound source side, thereby reducing the diffraction sound energy. The inclined plates are distributed at equal intervals to form a comb-tooth structure, which can change the sound field characteristics by causing the sound wave propagation boundary to change abruptly at the connection between the sound barrier body and the top end noise reduction device, thereby reducing the sound pressure level of the diffraction sound wave at the top end, and on the other hand, a large number of inclined plate edges can enhance the scattering of the sound wave at the top end. The vertical plate can prevent the sound wave from directly propagating to the protected area through the apertures between the inclined plates. Therefore, the diffraction sound wave at the top end of the sound barrier can be well reduced, and the noise reduction effect of the sound barrier can be greatly improved.

[0009] Further, the vertical plate and the inclined plate edges of the present application both have rectangular tooth structures, which can convert the large air vortex caused by high-speed train running into small air vortexes, thereby reducing the aerodynamic noise and further reducing the diffraction sound energy propagating to the protected area.

[0010] The top end noise reduction device of the present application does not contain porous sound-absorbing materials, has a long service life and almost no additional maintenance during use. Different materials can be used for manufacturing, and when the same material as the sound barrier body is used, the same service life as the sound barrier body can be achieved, and the integrity and aesthetics of the sound barrier can be achieved. In addition, the high-speed rail sound barrier top end device of the present application does not depend on the width size, so the top end can have a smaller width and weight, and is suitable for various application scenarios such as elevated lines and bridges.

[0011] The present application will be described in detail below in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of an embodiment of a high-speed rail sound barrier top end noise reduction device of the present application;

[0013] Figure 2 is a structural schematic diagram of a base 1.

[0014] Figure 3 is a schematic diagram of the structure of the bottom plate 2;

[0015] Figure 4 is a schematic diagram of the structure of the inclined plate 4;

[0016] In the figure: 1, base; 2, bottom plate; 3, vertical plate; 4, inclined plate; 11, base side bolt hole; 12, base upper surface bolt hole; 21, inclined plate mounting groove; 22, bottom plate mounting hole; 23, vertical plate mounting groove; 31, vertical plate rectangular tooth groove; 41, inclined plate rectangular tooth groove; 42, inclined plate middle hole. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, other embodiments can be obtained by those skilled in the art without creative effort.

[0018] Please refer to Figures 1-4 shown, an embodiment of a high-speed rail sound barrier top end noise reduction device, comprising a base 1, a bottom plate 2, a vertical plate 3 and an inclined plate 4.

[0019] The base 1 is a groove structure, mounted at the top end of the sound barrier body, mainly serving to connect the sound barrier body and the top end device, and has bolt holes 11 on both sides of the base 1 to facilitate secure connection with the sound barrier body, and has bolt holes 12 on the upper surface of the base to facilitate secure connection with the bottom plate 2. The width of the base groove is consistent with the width of the sound barrier body, and the depth of the base groove is between 8 cm and 15 cm. The base is made of metal material, and non-metal material can also be used when the strength and safety requirements are met.

[0020] The bottom plate 2 mainly serves to fix the vertical plate 3 and the inclined plate 4. The bottom plate 2 has mounting holes 22 for secure connection with the base 1, and has mounting grooves 23 for the vertical plate 3 and mounting grooves 21 for the inclined plate 4. The mounting grooves 23 and the mounting grooves 21 are arranged in a cross shape, and the vertical plate 3 and the inclined plate 4 are inserted into the appropriate position to complete the installation, which is convenient. The mounting groove 23 of the vertical plate 3 is located at the center of the bottom plate 2. The mounting groove 21 of the inclined plate 4 has a plurality of mounting grooves, which are arranged in parallel at a certain angle with the front and rear end faces of the bottom plate 2, and the spacing is between 5 cm and 20 cm. The width of the inclined plate mounting groove 21 and the vertical plate mounting groove 23 is consistent with the width of the inclined plate 4 and the vertical plate 3, and the depth of the inclined plate mounting groove 21 and the vertical plate mounting groove 23 is 2-5 times the width. The bottom plate 2 is the same width as the base 1. To ensure that the bottom plate has good levelness after installation, the bottom plate has a groove on the lower surface, and the groove depth is 3-5 mm. The material of the bottom plate 2 is the same as that of the vertical plate 3 and the inclined plate 4.

[0021] The vertical plate 3 is installed in the installation groove 23 of the bottom plate 2, the thickness of the vertical plate 3 is 3mm-10mm, the height of the vertical plate 3 is slightly lower than the height of the inclined plate 4, the minimum height difference is 1cm, the maximum height difference is 0.2 times the height of the inclined plate 4, and the top of the vertical plate 3 is provided with a rectangular tooth groove 31, the groove depth of the rectangular tooth groove 31 is between 1cm-3cm, and the groove width is between 2mm-6mm.

[0022] The inclined plate 4 is installed in the installation groove 21 of the bottom plate 2, and the top and both sides of the inclined plate 4 are provided with rectangular tooth grooves 41. In order to facilitate the installation of the vertical plate 3, an aperture 42 is opened in the middle of the inclined plate 4, and the aperture 42 in the inclined plate is the same height as the vertical plate 3. The groove depth in the side rectangular tooth groove 41 is not more than 1 / 6 of the width of the bottom plate 2 on the projection of the upper surface of the bottom plate 2, the inclined plate 4 and the vertical plate 3 are arranged in cross, and among the two straight lines formed by passing through the center of any inclined plate and the opposite side edges of the front and rear inclined plates, one straight line is perpendicular to the vertical plate, and the thickness of the inclined plate 4 is the same as that of the vertical plate 3.

[0023] The above is only an embodiment of the present application, it should be noted that for those skilled in the art, without departing from the structure of the present application, a number of variations can also be made, which should also be considered as the protection scope of the present application, these will not affect the effect and practicality of the patent. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A high-speed rail sound barrier top end noise reduction device, characterized in that, The device comprises a base, a bottom plate, vertical plates and inclined plates; the base is fixedly installed at the top end of the sound barrier screen body; the bottom plate is fixedly connected to the base; the vertical plates are installed in the middle of the bottom plate; the inclined plates are evenly distributed on the bottom plate, intersecting with the vertical plates at an angle less than 90° to form a comb-tooth structure; the edges of the vertical plates have rectangular tooth structures; and the edges of the inclined plates have rectangular tooth structures. The inclined plates and the vertical plates are arranged in a cross manner, and among two straight lines formed by the center of any inclined plate and the opposite sides of the adjacent front and rear inclined plates, one straight line is perpendicular to the vertical plate. A middle hole is formed in the middle of the inclined plate, and the middle hole is at the same height as the vertical plate.

2. The high-speed rail sound barrier top end noise reduction device according to claim 1, characterized in that, The overall width of the top noise reduction device is close to the width of the sound barrier screen body, and does not exceed 1.2 times the width of the sound barrier screen body.

3. The high-speed rail sound barrier top end noise reduction device according to claim 1, characterized in that, The base is a groove structure, and has bolt mounting holes at the side edges.

4. The high-speed rail sound barrier top end noise reduction device according to claim 1, characterized in that, The upper surface of the bottom plate has installation grooves for the vertical plates and the inclined plates, and the bottom plate has bolt holes fixedly connected to the base.

5. The high-speed rail sound barrier top end noise reduction device according to claim 1, characterized in that, The height of the vertical plate is less than the height of the inclined plate, and the difference is between 1cm and 0.2 times the height of the inclined plate; the top end of the vertical plate has a rectangular tooth structure, and the tooth structure points vertically upward.

6. The high-speed rail sound barrier top-end noise reduction device according to claim 1, wherein, The inclined plates have the same height, are arranged in parallel at equal intervals, have holes in the middle for installing the vertical plates, and have rectangular tooth structures at the top and the left and right edges; the tooth structure at the top of the inclined plate points vertically upward, and the tooth structures at the left and right edges respectively point outward.

7. The noise reduction device for the top end of a high-speed rail sound barrier according to claim 6, characterized in that, The interval between the inclined plates is between 5cm and 20cm.

8. The high-speed rail sound barrier top end noise reduction device according to claim 6, characterized in that, The projection of the side tooth groove depth of the rectangular tooth structure on the bottom plate does not exceed 1 / 6 of the width of the bottom plate.

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