Road sound absorption and noise reduction barrier

Abstract

The utility model relates to a road sound absorption and noise reduction barrier, which belongs to the technical field of road noise reduction, and comprises a sound absorption and noise reduction barrier main body, a mounting base, a support stand column, a planting groove and an embedded foundation bolt, the sound absorption and noise reduction barrier main body, the support stand column and the planting groove are mounted at the mounting base, and the support stand column supports the sound absorption and noise reduction barrier main body. The mounting bases are mounted on the ground through embedded foundation bolts, and sound absorption sponge sealing strips are arranged in gaps between the adjacent sound absorption and noise reduction barrier bodies. By means of the synergistic effect of the gradient density material layer and the Helmholtz resonant cavity structure, efficient absorption of broadband noise is achieved, landscape coordination is improved through the planting groove body, rainwater erosion is prevented through the film body material, and attractiveness and durability in the using process are improved. The problems that a traditional sound absorption and noise reduction barrier is insufficient in low-frequency noise suppression, poor in environment tolerance and weak in landscape coordination are effectively solved.

Description

Road sound-absorbing and noise-reducing barriers Technical Field

[0001] This utility model relates to the field of road noise reduction technology, and in particular to road sound-absorbing and noise-reducing barriers. Background Technology

[0002] Road noise barriers are structural facilities used to reduce the impact of traffic noise on the surrounding environment. They are usually installed on both sides of highways, railways or viaducts to reduce noise pollution by absorbing and blocking the propagation of sound waves.

[0003] A search revealed a Chinese patent with publication number CN202021442160.9 that discloses a noise reduction barrier. By using horizontal partitions to divide the interior of the sound insulation panel into multiple layers, the volume of penetrating noise is reduced layer by layer. Vertical partitions divide the internal multiple layers of the sound insulation panel into cavities of different sizes. At the same time, the horizontal and vertical partitions have protrusions, which can effectively diffuse the sound and avoid the generation of noise of the same frequency.

[0004] The above-mentioned technical solutions have the following drawbacks: although such sound-absorbing and noise-reducing barriers can improve the noise reduction effect by using diffuse reflection through longitudinal partitions, in actual use, these sound-absorbing and noise-reducing barriers are insufficient in suppressing low-frequency noise. Conventional porous materials have an absorption efficiency of less than 30% for low-frequency sound waves below 500Hz, poor environmental tolerance, the sound-absorbing layer is easily eroded by rainwater leading to performance degradation, high maintenance costs, weak landscape coordination, and concrete or metal plate structures are difficult to integrate into the urban ecological landscape. To solve the problems of low-frequency noise and structural durability, a road sound-absorbing and noise-reducing barrier is proposed. Through the synergistic effect of gradient density material layers and Helmholtz resonant cavity structures, it achieves efficient absorption of broadband noise, improves landscape coordination through planting troughs, and prevents rainwater erosion through membrane materials, thereby improving the aesthetics and durability during use.

[0005] In view of this, this work improves and solves the above problems. Through dedicated research and application of theoretical principles, a technical solution with a reasonable design that can effectively improve the above defects has finally been proposed.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the general background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] This utility model provides a road sound-absorbing and noise-reducing barrier, which solves the problems of insufficient low-frequency noise suppression, poor environmental tolerance, and weak landscape coordination of traditional sound-absorbing and noise-reducing barriers.

[0008] The solution of this utility model to solve the above-mentioned technical problems is as follows: a road sound-absorbing and noise-reducing barrier, including a sound-absorbing and noise-reducing barrier body, a mounting base, a supporting column, a planting trough, and pre-embedded anchor bolts. The sound-absorbing and noise-reducing barrier body, the supporting column, and the planting trough are installed at the mounting base. The supporting column supports the sound-absorbing and noise-reducing barrier body. The mounting base is installed on the ground by pre-embedded anchor bolts. Sound-absorbing sponge sealing strips are provided in the gaps between adjacent sound-absorbing and noise-reducing barrier bodies.

[0009] The main body of the sound-absorbing and noise-reducing barrier includes an outer aluminum alloy protective plate, a high flow resistance intermediate layer, a low-frequency resonant layer, and a sound insulation back panel. The outer aluminum alloy protective plate, the high flow resistance intermediate layer, the low-frequency resonant layer, and the sound insulation back panel are connected in sequence. The surface of the outer aluminum alloy protective plate is sprayed with a hydrophobic coating, which can be made of silicon dioxide. The high flow resistance intermediate layer is a composite material of polyester fiber and rubber particles. The low-frequency resonant layer uses a honeycomb ceramic matrix with nylon Helmholtz resonant cavities evenly installed. The sound insulation back panel is made of 1.5mm galvanized steel plate.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the outer layer of the aluminum alloy protective plate has a perforation rate of 25%-35%, a thickness of 1.2mm, and a hole diameter of 3mm.

[0012] Furthermore, the high flow resistance interlayer is a composite material of polyester fiber and rubber particles with a density of 80 kg / m³. 3 The porous structure of polyester fiber (porosity ≥85%) dissipates the energy of high-frequency sound waves in the 2000-5000Hz range through air friction, achieving a sound absorption coefficient of over 0.9. The damping properties of rubber particles can suppress low-frequency vibrations. In synergy with the Helmholtz resonant cavity, the sound absorption coefficient at 250Hz is increased to 0.65, while that of traditional rock wool is only 0.3. The gradient ratio of polyester fiber and rubber particles (70% fiber + 30% rubber) can achieve a continuous transition of acoustic impedance and reduce interface reflection loss.

[0013] Furthermore, the honeycomb ceramic substrate of the low-frequency resonant layer is 50mm thick, and grooves are made on the surface of the honeycomb ceramic substrate to embed the Helmholtz resonant cavity unit of the nylon shell. The diameter of the Helmholtz resonant cavity is 30-50mm, and the gaps between the ceramic honeycomb are filled with polyurethane foam. After curing, it forms an integral structure.

[0014] Furthermore, the sound insulation back panel is provided with damping adhesive, which is 2mm thick. The damping adhesive on the sound insulation back panel can effectively resist salt spray and improve service life.

[0015] Furthermore, the outer layer of the aluminum alloy protective plate and the high flow resistance intermediate layer are first sprayed with epoxy resin-based structural adhesive with a thickness of 0.5mm. The adhesive layer needs to cover the edge of the perforated area to prevent sound leakage. They are then hot-pressed together at 80℃ and 0.5MPa pressure to ensure that there are no air bubbles at the interface. Stainless steel countersunk rivets are used for mechanical fixation every 200mm to form a "glue-rivet" double connection.

[0016] Furthermore, the planting trough is equipped with green plant pots. Using noise-reducing plants such as ivy and star jasmine can form a "barrier-plant" synergistic noise reduction layer.

[0017] Furthermore, the supporting columns are uniformly and fixedly installed with connecting rods, which can be connected to the sound-absorbing and noise-reducing barrier body by screws, so that the supporting columns can stably support the sound-absorbing and noise-reducing barrier body.

[0018] Furthermore, the mounting base has a connection slot corresponding to the sound-absorbing and noise-reducing barrier body. The connection slot is connected to the sound-absorbing and noise-reducing barrier body by bolts, so that the sound-absorbing and noise-reducing barrier body can be stably installed on the top of the mounting base.

[0019] This utility model provides a road sound-absorbing and noise-reducing barrier, which has the following advantages:

[0020] 1. Compared to traditional porous materials such as rock wool, which typically have a low-frequency noise absorption coefficient of less than 0.3, this road sound-absorbing and noise-reducing barrier uses a Helmholtz resonant cavity and a gradient density material layer to improve the 250Hz low-frequency sound absorption coefficient to 0.65 through acoustic impedance matching and resonance effect, thus filling the gap in the existing technology's insufficient suppression of low-frequency roaring noise from heavy vehicles.

[0021] 2. The outer porous material composed of polyester fiber and rubber particles forms a micro-perforated sound-absorbing structure with the perforated protective plate, which has an absorption coefficient of more than 0.9 for high-frequency noise in the 2000-5000Hz range, covering the entire frequency band of traffic noise.

[0022] 3. The combination of aluminum alloy protective plate and honeycomb ceramic matrix (compressive strength > 5MPa) reduces the weight by 60% compared with traditional concrete barriers, while meeting the requirements for wind pressure resistance (≥1.2kPa), and has the advantages of lightweight and strength balance.

[0023] 4. The surface of the protective panel is coated with a hydrophobic coating, which has a self-cleaning efficiency of up to 90% under rainwater rinsing, avoiding the sound absorption performance degradation caused by pore blockage;

[0024] 5. This type of road sound-absorbing and noise-reducing barrier achieves efficient absorption of broadband noise through the synergistic effect of gradient density material layers and Helmholtz resonant cavity structure. The planting troughs enhance the landscape harmony, and the membrane material prevents rainwater erosion, improving the aesthetics and durability during use. It effectively solves the problems of insufficient low-frequency noise suppression, poor environmental tolerance, and weak landscape harmony of traditional sound-absorbing and noise-reducing barriers.

[0025] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 is a schematic diagram of the structure of a road sound-absorbing and noise-reducing barrier provided in an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the structure of the main body of the sound-absorbing and noise-reducing barrier in a road sound-absorbing and noise-reducing barrier according to an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the drive rod in a road sound-absorbing and noise-reducing barrier according to an embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of the structure of a road sound-absorbing and noise-reducing barrier provided in an embodiment of the present invention.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Sound-absorbing and noise-reducing barrier body; 101. Aluminum alloy outer protective plate; 102. High flow resistance intermediate layer; 103. Low frequency resonance layer; 104. Sound insulation back panel; 105. Hydrophobic coating; 106. Damping adhesive; 2. Mounting base; 3. Support column; 4. Planting trough; 5. Pre-embedded anchor bolts; 6. Green plant pot; 7. Sound-absorbing sponge sealing strip; 8. Connecting support rod; 9. Connecting slot. Detailed Implementation

[0033] The principles and features of this utility model are described below with reference to Figures 1-4. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0034] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] As shown in Figure 1, the road sound-absorbing and noise-reducing barrier includes a sound-absorbing and noise-reducing barrier body 1, a mounting base 2, a supporting column 3, a planting trough 4, and pre-embedded anchor bolts 5. The sound-absorbing and noise-reducing barrier body 1, the supporting column 3, and the planting trough 4 are installed on the mounting base 2. The supporting column 3 supports the sound-absorbing and noise-reducing barrier body 1. The mounting base 2 is installed on the ground by the pre-embedded anchor bolts 5. Sound-absorbing sponge sealing strips 7 are set at the gaps between adjacent sound-absorbing and noise-reducing barrier bodies 1. The outer layer 101 of the aluminum alloy guard plate has a perforation rate of 25%-35%, a thickness of 1.2mm, and a hole diameter of 3mm. The outer layer 101 of the aluminum alloy guard plate and the high flow resistance intermediate layer 102 are first sprayed with epoxy resin-based structural adhesive with a thickness of 0.5mm. The adhesive layer needs to cover the edge of the perforated area to prevent sound leakage. They are hot-pressed and bonded at 80℃ and 0.5MPa pressure to ensure that there are no air bubbles at the interface. Stainless steel countersunk rivets are used for mechanical fixing every 200mm to form a "glue-rivet" double connection.

[0037] Planting trough 4 is equipped with green plant pots 6. Using noise-reducing plants such as ivy and star jasmine, a "barrier-plant" synergistic noise reduction layer can be formed;

[0038] The supporting column 3 is evenly and fixedly installed with connecting rods 8. The connecting rods 8 can be connected to the sound-absorbing and noise-reducing barrier body 1 by screws, so that the supporting column 3 can stably support the sound-absorbing and noise-reducing barrier body 1.

[0039] The mounting base 2 has a connection slot 9 corresponding to the sound-absorbing and noise-reducing barrier body 1. The connection slot 9 is connected to the sound-absorbing and noise-reducing barrier body 1 by bolts, so that the sound-absorbing and noise-reducing barrier body 1 can be stably installed on the top of the mounting base 2.

[0040] As shown in Figure 2-3, the main body 1 of the sound-absorbing and noise-reducing barrier includes an aluminum alloy outer layer 101, a high flow resistance intermediate layer 102, a low-frequency resonant layer 103, and a sound-insulating back panel 104. The aluminum alloy outer layer 101, high flow resistance intermediate layer 102, low-frequency resonant layer 103, and sound-insulating back panel 104 are connected sequentially. The surface of the aluminum alloy outer layer 101 is coated with a hydrophobic coating 105. The high flow resistance intermediate layer 102 is a composite material of polyester fiber and rubber particles. The low-frequency resonant layer 103 uses a honeycomb ceramic matrix with uniformly installed nylon Helmholtz resonant cavities. The sound-insulating back panel 104 is made of 1.5mm galvanized steel plate. The high flow resistance intermediate layer 102 is a composite material of polyester fiber and rubber particles with a density of 80kg / m³. 3 Polyester fiber and rubber particles are mixed in a gradient ratio of 70% fiber + 30% rubber, which can achieve a continuous transition of acoustic impedance and reduce interface reflection loss. The sound insulation back panel 104 is provided with damping glue 106 with a thickness of 2mm. The damping glue 106 on the sound insulation back panel 104 can effectively resist salt spray and improve service life.

[0041] As shown in Figure 4, the honeycomb ceramic substrate of the low-frequency resonant layer 103 has a thickness of 50mm. The surface of the honeycomb ceramic substrate is grooved, and a Helmholtz resonant cavity unit with a nylon shell is embedded. The diameter of the Helmholtz resonant cavity is 30-50mm. The gaps between the ceramic honeycomb are filled with polyurethane foam, and after curing, an integral structure is formed.

[0042] The specific working principle and usage method of this utility model are as follows: the main body 1 of the sound-absorbing and noise-reducing barrier is prefabricated in the factory and directly transported to the installation position for use. The mounting base 2 is installed on the ground by pre-embedded anchor bolts 5. The support columns 3 are evenly installed on the top of the mounting base 2. The main body 1 of the sound-absorbing and noise-reducing barrier is installed in the connecting slot 9. The connecting rod 8 of the support column 3 is connected to the main body 1 of the sound-absorbing and noise-reducing barrier by screws, so that the main body 1 of the sound-absorbing and noise-reducing barrier can be evenly laid out for use. Sound-absorbing sponge sealing strips 7 are provided in the gaps between adjacent main bodies 1 of the sound-absorbing and noise-reducing barrier. The connected main bodies 1 of the sound-absorbing and noise-reducing barrier can absorb and reduce road noise.

[0043] The outer layer 101 of the aluminum alloy protective plate serves as a micro-perforated sound-absorbing structure, optimizing the incidence and diffusion of high-frequency sound waves and reducing surface reflection. The porous structure (porosity ≥85%) of the high-flow-resistance middle layer 102 of polyester fiber dissipates the energy of 2000-5000Hz high-frequency sound waves through air friction, achieving a sound absorption coefficient of over 0.9. The damping characteristics of the rubber particles suppress low-frequency vibrations, working synergistically with the Helmholtz resonant cavity to increase the 250Hz sound absorption coefficient to 0.65, compared to only 0.3 for traditional rock wool. The flow-resistance intermediate layer 102 suppresses structural vibration and reduces mid-frequency noise through the damping characteristics of rubber particles (loss factor ≥ 0.15). The Helmholtz resonant cavity absorbs sound by adjusting the cavity dimensions (e.g., 40mm diameter, 15mm neck length), locking the resonant frequency within the 80-150Hz range. Sound waves oscillate at high speed in the cavity neck, consuming energy through air viscosity friction and heat conduction, achieving a sound absorption coefficient of 0.6 at 100Hz. The surface density of the 1.5mm galvanized steel sheet is 11.7kg / m³. 2 Combined with 2mm damping adhesive 106, the sound insulation is ≥30dB above 500Hz. The top of the sound-absorbing and noise-reducing barrier body 1 is tilted forward by 15° to increase the difference in sound wave diffraction path, reduce diffraction sound energy, and increase diffraction attenuation by 3-5dB.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A road sound-absorbing and noise-reducing barrier, comprising a main body (1), a mounting base (2), supporting columns (3), a planting trough (4), and pre-embedded anchor bolts (5), characterized in that: The sound-absorbing and noise-reducing barrier body (1), supporting column (3), and planting trough (4) are installed on the mounting base (2). The supporting column (3) supports the sound-absorbing and noise-reducing barrier body (1). The mounting base (2) is installed on the ground by pre-embedded anchor bolts (5). Sound-absorbing sponge sealing strips (7) are provided in the gaps between adjacent sound-absorbing and noise-reducing barrier bodies (1). The sound-absorbing and noise-reducing barrier body (1) includes an aluminum alloy protective plate outer layer (101), a high flow resistance intermediate layer (102), and a low-frequency resonant layer (103). The sound insulation back panel (104) consists of an outer layer (101) of aluminum alloy protective plate, a high flow resistance intermediate layer (102), a low frequency resonance layer (103) and a sound insulation back panel (104) connected in sequence. The outer layer (101) of aluminum alloy protective plate is coated with a hydrophobic coating (105). The high flow resistance intermediate layer (102) is a composite material of polyester fiber and rubber particles. The low frequency resonance layer (103) is a honeycomb ceramic matrix with nylon Helmholtz resonant cavities evenly installed. The sound insulation back panel (104) is made of 1.5mm galvanized steel plate.

2. The road sound-absorbing and noise-reducing barrier according to claim 1, characterized in that, The outer layer (101) of the aluminum alloy protective plate has a perforation rate of 25%-35%, a thickness of 1.2mm, and a hole diameter of 3mm.

3. The road sound-absorbing and noise-reducing barrier according to claim 1, characterized in that, The high flow resistance interlayer (102) is a composite material of polyester fiber and rubber particles with a density of 80 kg / m³. 3 .

4. The road sound-absorbing and noise-reducing barrier according to claim 1, characterized in that, The low-frequency resonant layer (103) has a honeycomb ceramic substrate thickness of 50mm. The surface of the honeycomb ceramic substrate is grooved and a Helmholtz resonant cavity unit of nylon shell is embedded. The diameter of the Helmholtz resonant cavity is 30-50mm. The gaps between the ceramic honeycomb are filled with polyurethane foam and the integral structure is formed after curing.

5. The road sound-absorbing and noise-reducing barrier according to claim 1, characterized in that, The sound insulation back panel (104) is provided with damping adhesive (106), and the damping adhesive (106) is 2mm thick.

6. The road sound-absorbing and noise-reducing barrier according to claim 1, characterized in that, The outer layer (101) of the aluminum alloy protective plate and the high flow resistance intermediate layer (102) are first sprayed with epoxy resin-based structural adhesive with a thickness of 0.5mm. They are then hot-pressed together at 80℃ and 0.5MPa pressure. Stainless steel countersunk rivets are used for mechanical fixing every 200mm to form a "glue-rivet" double connection.

7. The road sound-absorbing and noise-reducing barrier according to claim 1, characterized in that, The planting trough (4) is equipped with green plant pots (6).

8. The road sound-absorbing and noise-reducing barrier according to claim 1, characterized in that, The supporting column (3) is uniformly fixed with connecting rods (8), which can be connected to the sound-absorbing and noise-reducing barrier body (1) by screws.

9. The road sound-absorbing and noise-reducing barrier according to claim 1, characterized in that, The mounting base (2) has a connection slot (9) corresponding to the sound-absorbing and noise-reducing barrier body (1), and the connection slot (9) is connected to the sound-absorbing and noise-reducing barrier body (1) by bolts.

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