Noise barrier plate

Abstract

The utility model discloses a noise barrier plate, and relates to the technical field of road engineering. The noise barrier plate comprises a sound absorption layer and a sound insulation layer, the sound absorption layer comprises a first sound absorption layer and a second sound absorption layer, the first sound absorption layer is arranged on one side of the second sound absorption layer, and the porosity of the material of the first sound absorption layer is smaller than that of the material of the second sound absorption layer; the sound insulation layer is arranged on the side, away from the first sound absorption layer, of the second sound absorption layer, a plurality of through cavities are formed in the sound insulation layer in the first direction, the sound absorption layers can effectively absorb and absorb traffic noise, the sound insulation layer can block propagation of the noise, and due to the arrangement of the cavities, the cavity resonance effect can be improved, and the propagation of the noise can be blocked.

Description

Technical Field

[0001] The present application relates to the technical field of road engineering, and in particular to a noise barrier board. Background Art

[0002] Highways and urban expressways generate a lot of noise when they are close to residential areas. In order to reduce the impact of noise on residents, it is usually necessary to install noise barriers on both sides of the road to reduce noise pollution.

[0003] However, the existing noise barrier panels have poor noise shielding effect, and the problem of residents being affected by noise is still serious. It is urgent to develop noise barrier panels with good sound absorption effect. Utility Model Content

[0004] The present application provides a noise barrier plate to solve the problem that the existing noise barrier plates have poor noise shielding effect.

[0005] In a first aspect, the present application provides a noise barrier panel, comprising a sound absorbing layer and a sound insulating layer, wherein:

[0006] The sound absorbing layer includes a first sound absorbing layer and a second sound absorbing layer, wherein the first sound absorbing layer is provided on one side of the second sound absorbing layer, and the porosity of the material of the first sound absorbing layer is smaller than the porosity of the material of the second sound absorbing layer;

[0007] The sound insulation layer is arranged on a side of the second sound absorbing layer away from the first sound absorbing layer, and the sound insulation layer is provided with a plurality of penetrating cavities in a first direction.

[0008] In this application, the sound-absorbing layer effectively absorbs and dissipates traffic noise, while the sound-insulating layer blocks noise transmission. The cavity design enhances resonance and hinders noise transmission. The lower porosity of the first sound-absorbing layer reduces the weight of the entire sound-absorbing layer and improves the absorption of high-frequency noise. The higher-porosity second sound-absorbing layer scatters and reflects low-frequency sound waves, initially dissipating some of the low-frequency energy. The lower-porosity first sound-absorbing layer better captures the remaining sound waves after initial processing, particularly the high-frequency portion. Sound is absorbed through the spaces between particles and the vibrations of the particles themselves, effectively dissipating both high- and low-frequency noise and enhancing the sound insulation effect.

[0009] It should be noted that noise usually spreads horizontally along the road and has a greater impact on residents. Therefore, the sound-absorbing layer of the noise barrier board of this application is usually close to the road side, and the sound insulation layer is close to the resident side, which can improve the effect of absorbing high-frequency noise.

[0010] In some embodiments, the porosity of the first sound-absorbing layer is 40-45%. The main function of the first sound-absorbing layer is to capture the remaining sound waves after the initial treatment, especially the high-frequency portion. The sound is absorbed through the gaps between the particles and the vibration of the particles themselves, so that both high-frequency noise and low-frequency noise can be fully absorbed. The porosity of the first sound-absorbing layer within this range can improve the absorption effect of the first sound-absorbing layer on high-frequency noise. Different porosity requirements can be controlled by controlling the particle size of the raw materials. The particle size of the raw materials can be controlled by granulation, screening, etc. The particle size of the particles in the first sound-absorbing layer can be controlled to 1-2 mm (10-20 mesh); and / or,

[0011] The porosity of the second sound-absorbing layer is 50-55%. The primary function of the second sound-absorbing layer is to scatter and reflect low-frequency sound waves, initially dissipating some of the low-frequency energy. Within this porosity range, the second sound-absorbing layer can enhance its low-frequency sound dissipation effectiveness. The porosity requirements can be controlled by controlling the particle size of the raw materials. The particle size of the raw materials can be controlled through granulation, screening, and other methods. The particle size of the particles in the second sound-absorbing layer can be controlled to be between 0.5 and 0.8 mm (40-60 mesh).

[0012] When sound waves enter the sound-absorbing layer, complex physical processes occur within the material's pores and particles. A sound-absorbing layer of a certain thickness can extend the sound wave's propagation path. As the thickness increases, the sound wave may reflect more frequently, and each reflection absorbs some energy, increasing the total absorbed energy. Sound-absorbing layers of varying thicknesses have varying degrees of improved absorption for sound waves of different frequencies. For low-frequency sound waves, sufficient thickness provides more space for the waves to propagate and attenuate. Low-frequency sound waves have longer wavelengths, requiring sufficient thickness to allow for sufficient reflection, scattering, and friction between particles, which dissipates energy. For high-frequency sound waves, which have shorter wavelengths, a first sound-absorbing layer thinner than the second sound-absorbing layer can effectively absorb high-frequency sound waves. Continuously increasing the thickness of the first sound-absorbing layer will, in turn, have a less pronounced effect on high-frequency sound waves.

[0013] In some embodiments, the thickness of the first sound absorbing layer is smaller than that of the second sound absorbing layer. Since the first sound absorbing layer mainly absorbs high-frequency sound waves and the second sound absorbing layer mainly absorbs low-frequency sound waves, the thickness has a greater impact on low-frequency sound waves than high-frequency sound waves. Therefore, the first sound absorbing layer only needs to be thinner than the second sound absorbing layer to achieve the absorption of high-frequency and low-frequency sound waves.

[0014] In some embodiments, the thickness of the first sound absorbing layer is 5 to 15 mm. When the thickness of the first sound absorbing layer is within this range, the absorption of high-frequency sound waves can be improved.

[0015] In some embodiments, the thickness of the second sound absorbing layer is 15 to 25 mm. When the thickness of the second sound absorbing layer is within this range, the absorption of low-frequency sound waves can be improved.

[0016] In some embodiments, the thickness of the sound insulation layer is 50 to 90 mm. The thickness of the sound insulation layer within this range can ensure the stability of the sound insulation layer structure while blocking the propagation of noise; and / or,

[0017] The cavity has a thickness of 30 to 70 mm. Within this range, the cavity provides sufficient strength and stability for the sound barrier while enhancing the cavity resonance effect. It should be noted that since the cavity is a through hole in the sound insulation layer in the first direction, the sound insulation layer at the bottom of the cavity has a certain wall thickness, typically 10 mm, to enhance the sound insulation effect.

[0018] In some embodiments, a connection reinforcement layer is further provided between the first and second sound absorbing layers. Since the sound absorbing layer is composed of the first and second sound absorbing layers, providing the connection reinforcement layer between the first and second sound absorbing layers can improve the secure connection between the first and second sound absorbing layers, thereby reducing delamination between the first and second sound absorbing layers.

[0019] In some embodiments, the material of the connecting reinforcement layer includes glass fiber, and the connecting reinforcement layer includes a first reinforcement layer and a second reinforcement layer, wherein the first reinforcement layer includes spaced glass fiber rods, and the second reinforcement layer includes a glass fiber mesh. The spaced glass fiber rods can enhance the overall bending fracture load strength and impact resistance of the board, and the spacing between the glass fiber rods can be 60 to 100 mm. The glass fiber mesh can further enhance the overall structural strength of the board. The mesh size of the glass fiber mesh can be 3 mm x 3 mm, 4 mm x 4 mm, or 5 mm x 5 mm.

[0020] In some embodiments, the spacing between the cavities is 60-100 mm. When multiple closely spaced resonant cavities are arranged, the different cavities can interact with each other. Sound waves from adjacent cavities can interfere with each other. When the resonant frequencies of adjacent cavities are similar, the propagation of sound waves between them leads to a coupling effect, widening the sound absorption band. Spacing cavities within this range can reduce the interference effect between adjacent cavities, enhance the resonance effect of the noise cavity, and improve the noise shielding effect.

[0021] In some embodiments, the volume proportion of the cavity on the sound insulation layer is 50% to 70%. Within this range, the volume proportion of the cavity on the sound insulation layer can provide sufficient strength and stability for the sound barrier and improve the cavity resonance effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a schematic structural diagram of a noise barrier plate according to an embodiment of the present application.

[0024] Figure 2 This is a left side view of the structure of a noise barrier plate according to an embodiment of the present application.

[0025] Figure 3 This is a right side view of the structure of a noise barrier plate according to an embodiment of the present application.

[0026] Figure 4 This is a front view of the structure of a noise barrier plate according to an embodiment of the present application.

[0027] Figure 5 This is a rear view of the structure of a noise barrier plate according to an embodiment of the present application.

[0028] Description of Figure Numbers:

[0029] 100 noise barrier board; 1 sound absorbing layer; 11 first sound absorbing layer; 12 second sound absorbing layer; 2 sound insulation layer; 21 cavity. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of this application without making any creative efforts shall fall within the scope of protection of this application.

[0031] Highways and urban expressways generate a lot of noise when they are close to residential areas. In order to reduce the impact of noise on residents, it is usually necessary to install noise barriers on both sides of the road to reduce noise pollution.

[0032] However, the existing noise barrier panels have poor noise shielding effect, and the problem of residents being affected by noise is still serious. It is urgent to develop noise barrier panels with good sound absorption effect.

[0033] In view of this, the present application provides a noise barrier plate to solve the problem that the existing noise barrier plates have poor noise shielding effect.

[0034] First, as Figures 1 to 5As shown, the present application provides a noise barrier board 100, comprising a sound absorbing layer 1 and a sound insulating layer 2, wherein:

[0035] The sound absorbing layer 1 includes a first sound absorbing layer 11 and a second sound absorbing layer 12. The first sound absorbing layer 11 is provided on one side of the second sound absorbing layer 12, and the porosity of the material of the first sound absorbing layer 11 is smaller than the porosity of the material of the second sound absorbing layer 12.

[0036] The sound insulation layer 2 is disposed on a side of the second sound absorbing layer 12 away from the first sound absorbing layer 11 . The sound insulation layer 2 is provided with a plurality of penetrating cavities 21 in a first direction.

[0037] In this application, the sound-absorbing layer 1 effectively absorbs and dissipates traffic noise, while the sound-insulating layer 2 blocks the propagation of noise. The provision of the cavity 21 enhances resonance and hinders noise transmission. The lower porosity of the material of the first sound-absorbing layer 11 compared to the second sound-absorbing layer 12 reduces the weight of the entire sound-absorbing layer 1 and improves the absorption of high-frequency noise. The second sound-absorbing layer 12 with a higher porosity scatters and reflects low-frequency sound waves, initially dissipating some of the low-frequency energy. The first sound-absorbing layer 11 with a lower porosity better captures the remaining sound waves after the initial treatment, especially the high-frequency portion. Sound is absorbed through the spaces between the particles and the vibrations of the particles themselves, effectively dissipating both high- and low-frequency noise and enhancing the sound insulation effect.

[0038] It should be noted that noise usually spreads horizontally along the road and has a greater impact on residents. Therefore, the sound-absorbing layer 1 of the noise barrier panel 100 of the present application is usually close to the road side, and the sound-insulating layer 2 is close to the resident side, which can improve the effect of absorbing high and low frequency traffic noise.

[0039] In combination with the first aspect, in some embodiments provided in the present application, the porosity of the first sound-absorbing layer 11 is 40-45%. The main function of the first sound-absorbing layer 11 is to capture the remaining sound waves after preliminary processing, especially the high-frequency part, and absorb sound through the gaps between the particles and the vibration of the particles themselves, so that both high-frequency noise and low-frequency noise can be fully absorbed. The porosity of the first sound-absorbing layer 11 is within this range. It can improve the absorption effect of the first sound-absorbing layer 11 on high-frequency noise. Different porosity requirements can be controlled by controlling the particle size of the raw materials. The particle size of the raw materials can be controlled by granulation, screening, etc. The particle size of the particles of the first sound-absorbing layer 11 can be controlled at 1-2 mm (10-20 mesh).

[0040] In conjunction with the first aspect, in some embodiments provided herein, the porosity of the second sound-absorbing layer 12 is 50-55%. The primary function of the second sound-absorbing layer 12 is to scatter and reflect low-frequency sound waves, initially dissipating some of the low-frequency energy. Within this porosity range, the second sound-absorbing layer 12 can improve the dissipation of low-frequency sound waves. The porosity requirements can be controlled by controlling the particle size of the raw materials. The particle size of the raw materials can be controlled through granulation, screening, and other methods. The particle size of the particles in the second sound-absorbing layer 12 can be controlled to be between 0.5 and 0.8 mm (40-60 mesh).

[0041] In some embodiments provided herein, the sound-absorbing layer 1 is made of red mud, microsilica fume, mineral powder, polypropylene fiber, sodium silicate, sodium hydroxide, nickel slag, polyacrylamide, and latex powder. By treating and reprocessing various solid wastes, such as discarded construction materials and industrial waste, into durable sound barrier construction materials, the recycling rate of renewable resources can be increased, environmental pollution can be reduced, energy conservation and emissions can be reduced, and costs can be lowered.

[0042] It should be noted that red mud is a difficult solid waste to dispose of. It requires significant land for storage and causes significant environmental damage. This has become a significant challenge for aluminum smelters. Therefore, utilizing red mud to produce building materials not only reduces raw material costs but also improves the environment, solving the company's solid waste disposal challenge. Silica fume typically refers to the dust emitted during the high-temperature smelting of industrial silicon and ferrosilicon in industrial electric furnaces, which is collected and processed using specialized capture devices. Mineral fines typically refer to the powdered product of ore crushing. Nickel slag typically refers to the solid waste residue produced by smelting nickel-iron alloys. Latex powder typically refers to the powdered rubber material obtained by crushing waste rubber products. Red mud has a high sodium ion content. Alkali-based geopolymer cementitious material synthesis technology can be used to convert the sodium ions in red mud into part of the activator in the synthetic material. Other raw materials in the red mud can be used as activators. By adding active initiators such as calcined kaolin tailings, calcined coal gangue, blast furnace slag, steel slag, and microsilica fume, cementitious materials can be prepared. The hollow building board is produced through the extrusion molding process, realizing the recycling of solid waste. Most of the solid waste is inorganic non-metallic materials, which have the advantages of corrosion resistance, aging resistance, and high temperature resistance, which can ensure the long-term stable operation of the noise barrier board 100 in harsh natural environments.

[0043] In some embodiments provided herein, the materials for the sound-absorbing layer 1 include, by weight, 20-60 parts red mud, 20-30 parts microsilica fume, 10-20 parts mineral powder, 5-10 parts polypropylene fiber, 10-15 parts sodium silicate, 2-3 parts sodium hydroxide, 40-50 parts nickel slag, 2-5 parts polyacrylamide, and 1-2 parts latex powder. Within this range, the materials for the sound-absorbing layer 1 can effectively improve the utilization rate of solid waste, enhance the structural strength and porosity of the sound-absorbing layer, and effectively absorb high- and low-frequency traffic noise.

[0044] It should be noted that the sound absorbing layer 1 and the second sound absorbing layer 12 are made of the same material, and the difference lies in their porosity, which can be measured by a weight method, a volume method, a CT scanning method, or the like.

[0045] In some embodiments provided herein, the sound insulation layer 2 is made of cement, mineral powder, red mud, aluminum ore tailings, wood fiber, latex powder, an early strength agent, cellulose ether, and a water reducer. By treating and reprocessing various solid wastes, such as discarded construction materials and industrial waste, into durable sound barrier construction materials, the recycling rate of renewable resources can be increased, environmental pollution can be reduced, energy conservation and emissions can be reduced, and costs can be lowered.

[0046] In some embodiments provided herein, the materials for the sound insulation layer 2 include, by weight, 30-40 parts cement, 5-10 parts mineral powder, 25-30 parts red mud, 30-35 parts aluminum ore tailings, 10-20 parts wood fiber, 5-10 parts latex powder, 2-5 parts early strength agent, 3-5 parts cellulose ether, and 5-10 parts water reducer. The weight of the materials for the sound insulation layer 2 within this range can reduce the weight of the structure and increase its stability.

[0047] It should be noted that aluminum ore tailings generally refers to ore tailings composed primarily of gibbsite, boehmite, or diaspore. Wood fiber generally refers to recyclable materials or new wood fiber made from wood fiber, such as newspaper, kraft paper, and corrugated paper. Latex powder generally refers to a powdered substance obtained by drying a colloidal liquid latex mixture of latex and water. An accelerator generally refers to an admixture that improves the early strength of concrete. A water reducer generally refers to a concrete admixture that reduces the amount of mixing water while maintaining a substantially unchanged slump.

[0048] When sound waves enter the sound-absorbing layer, complex physical processes occur within the pores and particles within the material. A sound-absorbing layer of a certain thickness can extend the propagation path of the sound waves. As the thickness increases, the number of times the sound waves reflect within it may increase, and each reflection absorbs some energy, increasing the total absorbed energy. Sound-absorbing layers of different thicknesses have varying degrees of increased absorption for sound waves of different frequencies. For low-frequency sound waves, sufficient thickness provides more space for the sound waves to propagate and attenuate. Low-frequency sound waves have longer wavelengths, and sufficient thickness is required to allow the sound waves to undergo sufficient reflection, scattering, and friction between particles, thereby consuming energy. For high-frequency sound waves, which have shorter wavelengths, a first sound-absorbing layer 11 having a thickness smaller than that of the second sound-absorbing layer 12 can already achieve a good absorption effect on high-frequency sound waves. Continuously increasing the thickness of the first sound-absorbing layer 11 will, on the contrary, have a less significant absorption effect on high-frequency sound waves.

[0049] In combination with the first aspect, in some embodiments provided in the present application, the thickness of the first sound absorbing layer 11 is less than the thickness of the second sound absorbing layer 12. Since the first sound absorbing layer 11 mainly absorbs high-frequency sound waves and the second sound absorbing layer 12 mainly absorbs low-frequency sound waves, the thickness has a greater impact on low-frequency sound waves than high-frequency sound waves. Therefore, the first sound absorbing layer 11 only needs to be thinner than the second sound absorbing layer 12 to achieve the absorption of high-frequency and low-frequency sound waves.

[0050] In conjunction with the first aspect, in some embodiments provided herein, the thickness of the first sound-absorbing layer 11 is 5 to 15 mm. Within this thickness range, the first sound-absorbing layer 11 can improve the absorption of high-frequency sound waves. The thickness of the first sound-absorbing layer 11 includes, but is not limited to, 5 mm, 8 mm, 10 mm, 12 mm, or 15 mm.

[0051] In conjunction with the first aspect, in some embodiments provided herein, the second sound-absorbing layer 12 has a thickness of 15 to 25 mm. Within this thickness range, the second sound-absorbing layer 12 can improve the absorption of low-frequency sound waves. The thickness of the second sound-absorbing layer 12 includes, but is not limited to, 15 mm, 18 mm, 20 mm, 22 mm, or 25 mm.

[0052] In conjunction with the first aspect, in some embodiments provided herein, the thickness of the sound insulation layer 2 is 50 to 90 mm. Within this thickness range, the sound insulation layer 2 can ensure stable structural strength while blocking noise transmission. The thickness of the sound insulation layer 2 includes, but is not limited to, 50 mm, 60 mm, 70 mm, 80 mm, or 90 mm.

[0053] In conjunction with the first aspect, in some embodiments provided herein, the thickness of the cavity 21 is 30 to 70 mm. Within this thickness range, the cavity 21 provides sufficient strength and stability for the sound barrier, while also enhancing the cavity resonance effect. It should be noted that since the cavity 21 is a through-hole in the sound insulation layer 2 in the first direction, to enhance the sound insulation effect, the sound insulation layer 2 at the bottom of the cavity 21 has a certain wall thickness, typically 10 mm. The thickness of the cavity 21 includes, but is not limited to, 30 mm, 40 mm, 50 mm, 60 mm, or 70 mm.

[0054] In conjunction with the first aspect, in some embodiments provided herein, a connection reinforcement layer (not shown) is further provided between the first sound-absorbing layer 11 and the second sound-absorbing layer 12. Since the sound-absorbing layer 1 is composed of the first sound-absorbing layer 11 and the second sound-absorbing layer 12, the connection reinforcement layer is provided between the first sound-absorbing layer 11 and the second sound-absorbing layer 12 to enhance the secure connection between the first sound-absorbing layer 11 and the second sound-absorbing layer 12, thereby reducing delamination between the first sound-absorbing layer 11 and the second sound-absorbing layer 12.

[0055] In combination with the first aspect, in some embodiments provided in the present application, the material of the connecting reinforcement layer includes glass fiber, and the connecting reinforcement layer includes a first reinforcement layer (not shown in the figure) and a second reinforcement layer (not shown in the figure), wherein the first reinforcement layer includes spaced glass fiber rods, and the second reinforcement layer includes glass fiber mesh cloth. The spaced glass fiber rods can enhance the overall bending fracture load strength and impact resistance of the board, and the spacing between the glass fiber rods can be 60 to 100 mm. The glass fiber mesh cloth can further improve the overall structural strength of the board. The mesh of the glass fiber mesh cloth can be 3mm×3mm, 4mm×4mm or 5mm×5mm.

[0056] In combination with the first aspect, in some embodiments provided in the present application, the spacing between the cavities 21 is 60 to 100 mm. When there are multiple dense cavities 21 resonant cavity combinations, different cavities will affect each other. There is mutual interference between the sound waves of adjacent cavities. When the resonance frequencies of adjacent cavities are similar, the propagation of sound waves between adjacent cavities will cause a coupling effect, which will widen the sound absorption band. The spacing between the cavities 21 within this range can reduce the interference effect between adjacent cavities, enhance the resonance effect of the noise cavity 21, and enhance the noise shielding effect. The spacing between the cavities 21 includes but is not limited to 60 mm, 70 mm, 80 mm, 90 mm or 100 mm.

[0057] In conjunction with the first aspect, in some embodiments provided herein, the volume of the cavity 21 on the sound insulation layer 2 accounts for 50% to 70%. Within this range, the volume of the cavity 21 on the sound insulation layer 2 ensures that, after being absorbed by one cavity, the sound wave still has sufficient energy to be reabsorbed when entering the next cavity. The volume of the cavity 21 on the sound insulation layer 2 may include, but is not limited to, 50%, 55%, 60%, 65%, or 70%.

[0058] In conjunction with the first aspect, in some embodiments provided herein, a waterproof and hydrophobic cloth may be laid between the surface of the second sound-absorbing layer 12 and the sound-insulating layer 2 to reduce rainwater penetration and thereby reduce the weight of the panel itself. A nano-silicon waterproof and hydrophobic material may also be sprayed on the surface of the noise barrier panel 100 to further enhance its waterproof and weather resistance. Specifically, the following preparation method can be used: the material of the sound insulation layer 2 is formed by high-pressure vacuum extrusion, with a width of 500mm and a thickness of 80mm. After curing, it is placed on a multi-drill drilling machine for drilling, with a hole spacing of 80mm×80mm, and the hole volume accounting for 50%. The drilled board is laid flat on the ground, and the sound absorption layer is laid in a grid pattern. The material of the second sound absorption layer 12 is first laid on the back side of the cavity 21, with a thickness of 22mm. Then, glass fiber rods with a diameter of 3mm are laid on the surface of the second sound absorption layer 12, with a spacing of 100mm. Glass fiber mesh is laid on top of the glass rods, and the material of the first sound absorption layer 11 is laid on top of the glass fiber mesh, with a thickness of 8mm. The surface is lightly pressed to flatten. After laying, it is naturally cured for 3 days. During the laying process, in order to improve the connection between the sound insulation layer 2 and the sound absorption layer 1, the sound insulation layer 2 can be set into a groove structure, and the sound absorption layer 1 is reinforced by both sides of the groove to reduce the risk of the sound absorption layer 1 falling off.

[0059] In summary, the sound-absorbing layer effectively absorbs and dissipates traffic noise, while the sound-insulating layer blocks noise transmission. The cavity design enhances cavity resonance, hindering noise transmission. The lower porosity of the first sound-absorbing layer reduces the weight of the entire layer and improves the absorption of high-frequency noise. The higher-porosity second sound-absorbing layer scatters and reflects low-frequency sound waves, initially dissipating some of the low-frequency energy. The lower-porosity first sound-absorbing layer better captures the remaining sound waves after initial processing, particularly the high-frequency portion. The inter-particle spaces and the vibrations of the particles absorb sound, effectively absorbing both high- and low-frequency noise and enhancing the sound insulation effect.

[0060] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0061] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0062] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A noise barrier panel, characterized in that: It includes a sound absorbing layer and a sound insulating layer, wherein: The sound absorbing layer includes a first sound absorbing layer and a second sound absorbing layer, wherein the first sound absorbing layer is provided on one side of the second sound absorbing layer, and the porosity of the material of the first sound absorbing layer is smaller than the porosity of the material of the second sound absorbing layer; The sound insulation layer is arranged on a side of the second sound absorbing layer away from the first sound absorbing layer, and the sound insulation layer is provided with a plurality of penetrating cavities in a first direction.

2. The noise barrier panel according to claim 1, wherein: The porosity of the first sound-absorbing layer is 40-45%; and / or, The porosity of the second sound-absorbing layer is 50-55%.

3. The noise barrier panel according to claim 1, wherein: The thickness of the first sound absorbing layer is smaller than that of the second sound absorbing layer.

4. The noise barrier panel according to claim 1, wherein: The thickness of the first sound-absorbing layer is 5-15 mm.

5. The noise barrier panel according to claim 1, wherein: The thickness of the second sound-absorbing layer is 15-25 mm.

6. The noise barrier panel according to claim 1, wherein: The thickness of the sound insulation layer is 50-90 mm; and / or, The thickness of the cavity is 30-70 mm.

7. The noise barrier panel according to claim 1, wherein: A connection reinforcement layer is further provided between the first sound absorbing layer and the second sound absorbing layer.

8. The noise barrier panel according to claim 7, wherein: The connection reinforcement layer includes a first reinforcement layer and a second reinforcement layer, wherein the first reinforcement layer includes glass fiber rods arranged at intervals, and the second reinforcement layer includes glass fiber mesh cloth.

9. The noise barrier panel according to claim 1, wherein: The spacing between the cavities is 60-100 mm.

10. The noise barrier panel according to claim 1, wherein: The volume of the cavity on the sound insulation layer accounts for 50% to 70%.

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