sound-absorbing panels

Abstract

To provide a sound absorbing panel which can provide a sound reduction effect with respect to the lateral and lower side of a sound source, and the extension line from the sound source to the sound absorbing panel, respectively.SOLUTION: A sound absorbing panel 1 installed on the uppermost stage of a sound-proof wall, is provided with an exterior member 10 having a front face part 11 facing the sound source side, a back face part 12, and a top surface part 14 located on the upper part of the sound absorbing panel 1, a vertical partition member 22 provided inside of the exterior member 10 and provided in the vertical direction to be located between the front face part 11 and the back face part 12, and sound absorbing members 2a, 2b provided inside of the exterior member 10. A first opening 16a and a second opening 16b are provided in the entire of the front face part 11 and the entire of the back face part 12. Further, a third opening 16c is provided on the top surface part 14.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an acoustical panel. [Background technology]

[0002] The sound-absorbing panels installed on the top of the soundproof wall attenuate not only the sound reflected between the walls but also the sound (diffracted sound) that is reflected from the sound source side, among the sounds emitted from the sound source side. This makes it possible to reduce noise on the back side of the soundproof wall, which is the sound receiving side. Examples of sound-absorbing panels are known from Patent Documents 1 to 4. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-101747 [Patent Document 2] International Publication No. 2015 / 114929 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-227680 [Patent Document 4] Japanese Patent Application Laid-Open No. 2016-211344 Summary of the Invention [Problem to be solved by the invention]

[0004] The sound-absorbing panels described in Patent Documents 1 to 4 are all installed on the topmost level of a soundproof wall. The sound-absorbing panels described in Patent Documents 1 to 4 have sound-transmitting surfaces with numerous sound insertion holes on both the front side, which is the sound source side, and the back side, which is the sound-receiving side. All of Patent Documents 1 to 4 utilize "edge effect suppression technology," which aims to further improve the sound reduction effect by absorbing and attenuating sound diffracted near the upper edge of the sound-absorbing panel through the sound insertion holes.

[0005] However, in the sound-absorbing panels described in Patent Documents 1 to 4, the entire front and back surfaces are sound-transmitting surfaces, and although diffracted sound can be reduced, sound that passes through the sound-absorbing panel (transmitted sound) cannot be reduced. For this reason, if a sound-receiving point is located on an extension line connecting the sound source and the sound-absorbing panel installed on the topmost level of the soundproof wall, noise cannot be reduced at this sound-receiving point.

[0006] This invention has been made in consideration of the above circumstances, and its object is to provide a sound-absorbing panel that can achieve sound reduction effects at sound-receiving points to the side and below the sound source, as well as on an extension line from the sound source to the sound-absorbing panel installed on the top level of a soundproof wall. [Means for solving the problem]

[0007] The sound-absorbing panel according to a first aspect of the present invention is a sound-absorbing panel to be installed at the top of a soundproof wall, and comprises an exterior material having a front surface facing a sound source, a rear surface, and a top surface located above the sound-absorbing panel; a vertical partition material arranged inside the exterior material and positioned between the front surface and the rear surface in the up-down direction; and a sound-absorbing material arranged inside the exterior material, wherein a first opening and a second opening are provided over the entire front surface and the entire rear surface, respectively, and a third opening is provided over the entire top surface. The whole of Established in the vertical partition is any one of a metal plate-like member, a rubber or lead sheet-like member, and a high-density cloth member; the top surface portion is between the front surface portion and the back surface portion and connects an upper edge corner on the front surface side to an upper edge corner on the back surface side; the exterior material has a bottom surface portion facing the top surface portion in the up-down direction; the vertical partition is in contact with the bottom surface portion and is installed inside the exterior material and is provided partway between the top surface portion and the bottom surface portion; the sound-absorbing material is made of a single sound-absorbing material, and the single sound-absorbing material is bent between the upper surface of the vertical partition material and the top surface portion, and is located between the front surface portion and the vertical partition material, between the upper surface of the vertical partition material and the top surface portion, and between the back surface portion and the vertical partition material, respectively. It is characterized by:

[0013] No. 2 The sound-absorbing panel according to the present invention is characterized in that, in the first aspect, at least the surface of the single sound-absorbing material that faces the top surface portion is covered with a breathable, water-repellent material.

[0014] No. 3 The sound-absorbing panel according to the present invention is characterized in that, in the first aspect, the single sound-absorbing material is in contact with the top surface portion.

[0021] No. 4 The sound-absorbing panel according to the present invention is the first invention to the second invention. 3 Any one of the inventions term In the present invention, the first opening has a louver shape. [Effects of the Invention]

[0022] 1st ~ 1st 4 According to the present invention, it is possible to provide a sound-absorbing panel that can achieve a sound-reducing effect at sound-receiving points to the side and below the sound source, and on an extension line from the sound source to the sound-absorbing panel installed on the top level of the soundproof wall. [Brief explanation of the drawings]

[0023] [Figure 1] Fig. 1(a) is a schematic front view showing an example of a sound-absorbing panel according to a first embodiment of the present invention, and Fig. 1(b) is a schematic rear view showing an example of a sound-absorbing panel according to the first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II in FIGS. 1(a), 1(b), and 3. FIG. [Figure 3] FIG. 3 is a schematic top view showing an example of the sound-absorbing panel according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a schematic front view showing an example of a soundproof wall in which the sound-absorbing panel according to the first embodiment of the present invention is used. [Figure 5] FIG. 5 is a schematic rear view showing an example of a soundproof wall in which the sound-absorbing panel according to the first embodiment of the present invention is used. [Figure 6] FIG. 6 is a schematic diagram showing the state of sound insulation by a soundproof wall provided with a sound-absorbing panel according to a reference example. [Figure 7] FIG. 7 is a schematic diagram showing the state of sound insulation by a soundproof wall provided with a sound-absorbing panel according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a second embodiment of the present invention. [Figure 9] FIG. 9 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a fourth embodiment of the present invention. [Figure 11]FIG. 11 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a fifth embodiment of the present invention. [Figure 12] FIG. 12 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a sixth embodiment of the present invention. [Figure 13] 13(a) to 13(c) are schematic cross-sectional views showing examples of a sound-absorbing panel according to a seventh embodiment of the present invention. [Figure 14] 14(a) to 14(c) are schematic cross-sectional views showing examples of a sound-absorbing panel according to an eighth embodiment of the present invention. [Figure 15] 15(a) to 15(c) are schematic cross-sectional views showing examples of a sound-absorbing panel according to a ninth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, some embodiments of the present invention will be described with reference to the drawings. In each drawing, the up-down direction is referred to as the up-down direction Z, one planar direction that intersects with, for example, is perpendicular to, the up-down direction Z is referred to as the first planar direction X, and another planar direction that intersects with, for example, is perpendicular to, both the up-down direction Z and the first planar direction X is referred to as the second planar direction Y. In addition, common parts in each drawing are given common reference symbols, and duplicate explanations will be omitted.

[0025] (First embodiment) Fig. 1(a) is a schematic front view showing an example of a sound-absorbing panel according to a first embodiment of the present invention. Fig. 1(b) is a schematic back view showing an example of a sound-absorbing panel according to the first embodiment of the present invention. Fig. 2 is a schematic cross-sectional view taken along line II-II in Figs. 1(a), 1(b) and 3. Fig. 3 is a schematic top view showing an example of a sound-absorbing panel according to the first embodiment of the present invention.

[0026] As shown in FIGS. 1(a) to 3, a sound-absorbing panel 1 according to a first embodiment includes an exterior material 10, a vertical partition member 22, and sound-absorbing materials (2a, 2b). The exterior material 10 has, for example, a front panel (front portion) 11, a back panel (back portion) 12, and a top surface portion 14. The front panel 11 faces the sound source side. The back panel 12 faces the sound receiving side. The top surface portion 14 is located at the top of the sound-absorbing panel 1. The front panel 11 and the back panel 12 face each other and are spaced apart in the second planar direction Y. An upper portion of at least one of the front panel 11 and the back panel 12 is bent, for example, into an L shape to form the top surface portion 14. Note that a separate top panel may be provided as the top surface portion 14. A lower portion of at least one of the front panel 11 and the back panel 12 is bent, for example, into an L shape to form a bottom surface portion 15. The bottom surface portion 15 faces the top surface portion 14 in the up-down direction Z. Note that a separate bottom plate may be provided as the bottom surface portion 15. An example of the front plate 11 is, for example, an aluminum plate. An example of the back plate 12 is, for example, a highly weather-resistant plated steel plate.

[0027] The vertical partition 22 is disposed in a space surrounded by the front panel 11, the back panel 12, the top surface 14, and the bottom surface 15. In this way, the vertical partition 22 is fitted inside the exterior cladding 10. The vertical partition 22 is positioned between the front panel 11 and the back panel 12 and provided in the up-down direction Z. In the sound-absorbing panel 1, the vertical partition 22 contacts each of the top surface 14 and the bottom surface 15. In this way, the exterior cladding 10 has a first interior space surrounded by the front panel 11, the vertical partition 22, the top surface 14, and the bottom surface 15, and a second interior space surrounded by the back panel 12, the vertical partition 22, the top surface 14, and the bottom surface 15.

[0028] The vertical partitions 22 may be made of metal plate-like members, rubber or lead sheet-like members, or high-density fabric members (such as soundproof curtains or sound-blocking curtains). In this embodiment, a case where a metal plate-like member is used will be described.

[0029] The sound-absorbing materials of the sound-absorbing panel 1 include a first sound-absorbing material 2a and a second sound-absorbing material 2b. The first sound-absorbing material 2a is disposed in the first interior space and is located between the front panel 11 and the vertical partition material 22. The second sound-absorbing material 2b is disposed in the second interior space and is located between the back panel 12 and the vertical partition material 22. As a result, the first sound-absorbing material 2a and the second sound-absorbing material 2b are each fitted inside the exterior material 10. The first and second sound-absorbing materials 2a and 2b are, for example, polyester fiber nonwoven fabric or glass wool.

[0030] The front panel 11 is provided with a plurality of first openings 16a that transmit sound. These first openings 16a are provided throughout the entire front panel 11. Note that the term "entire" used in this specification does not only refer to the complete entirety, but also to the substantial or actual entirety (almost the entirety) as shown in FIGS. 1(a) and 1(b). Each of the first openings 16a has a circular shape in plan view, for example. The back panel 12 is provided with a plurality of second openings 16b that transmit sound. These second openings 16b are provided throughout the entire back panel 12. Each of the second openings 16b has a circular shape in plan view, for example. The top surface 14 is provided with a plurality of third openings 16c that transmit sound. These third openings 16c are provided throughout the entire top surface 14. Each of the third openings 16c has a circular shape in plan view, for example. As a result, in the sound-absorbing panel 1, substantially the entire front plate 11, substantially the entire back plate 12, and substantially the entire top surface 14 each serve as a sound-transmitting surface that transmits sound.

[0031] Fig. 4 is a schematic front view showing an example of a soundproof wall using the sound-absorbing panel according to the first embodiment of the present invention, and Fig. 5 is a schematic rear view showing an example of a soundproof wall using the sound-absorbing panel according to the first embodiment of the present invention.

[0032] As shown in Figures 4 and 5, the soundproof wall 100 includes a sound-absorbing panel 1, an intermediate sound-absorbing panel 3, and support columns 4. The support columns 4 are erected, for example, on a road wall parapet 150 or the like, at a designed interval. The intermediate sound-absorbing panels 3 are arranged between the support columns 4, for example, along the first planar direction X and in the vertical direction Z. The sound-absorbing panel 1 is installed in the topmost row of the soundproof wall 100, in which multiple rows of intermediate sound-absorbing panels 3 are arranged in the vertical direction Z. Note that only one row of intermediate sound-absorbing panels 3 may be installed along the first planar direction X. Alternatively, the intermediate sound-absorbing panel 3 may be omitted, and only the sound-absorbing panels 1 may be installed lined up along the first planar direction X.

[0033] Like the sound-absorbing panel 1, the middle sound-absorbing panel 3 includes an exterior material and a sound-absorbing material. Like the sound-absorbing panel 1, the exterior material of the middle sound-absorbing panel 3 also has, for example, a front panel (front portion) 31 and a back panel (back portion) 32. The front panel 31 faces the sound source side. The back panel 32 faces the sound receiving side. A sound-absorbing material (not shown) is installed inside the exterior material. The front panel 31 is provided with a plurality of fourth openings 36 that transmit sound. These fourth openings 36 are provided throughout the front panel 31. The fourth openings 36 are, for example, louver-shaped. In contrast to this front panel 31, the back panel 32 does not have any openings that transmit sound. As a result, on the back side of the soundproof wall 100, the second openings 16b that transmit sound are provided only in the sound-absorbing panel 1 installed on the topmost row of the soundproof wall 100.

[0034] A soundproof wall 100 equipped with such a sound-absorbing panel 1 can provide the following advantages, for example.

[0035] Fig. 6 is a schematic diagram showing the state of sound insulation by a soundproof wall equipped with a sound-absorbing panel according to a reference example. Fig. 7 is a schematic diagram showing the state of sound insulation by a soundproof wall equipped with a sound-absorbing panel according to the first embodiment of the present invention. The soundproof wall is installed, for example, on a wall parapet 201 of a viaduct 200.

[0036] As shown in Fig. 6, the sound-absorbing panel 1r according to the reference example has sound-transmitting openings provided throughout the entire front panel 11r and the entire back panel 12r. In a soundproof wall 100r equipped with such a sound-absorbing panel 1r, diffracted sound DS diffracted near the upper edge of the sound-absorbing panel 1r is absorbed through the openings, thereby attenuating the diffracted sound DS. This allows the sound-absorbing panel 1r to have a sound-reducing effect on the diffracted sound DS at sound-receiving points A located to the sides and below the soundproof wall 100r, such as residents and users of a building 300 located to the sides and below the soundproof wall 100r.

[0037] That is, to reduce the diffracted sound DS that diffracts near the upper edge of the sound-absorbing panel 1r installed on the top tier, "edge effect suppression technology" is used. With this technology, when sound travels over a thick wall, it forms concentric wavefronts centered on two points, the front-side upper edge corner 19a and the back-side upper edge corner 19b, and it can be considered as if the sound source is located at the center of the concentric circles. Therefore, by locating sound-absorbing functions in these areas, sound can be effectively absorbed.

[0038] However, transmitted sound TS is generated on an extension line I from the sound source SS to the sound-absorbing panel 1r installed on the topmost level of the soundproof wall 100r. For this reason, it is difficult to expect a sound-receiving point B on the extension line I, for example, a building 350, such as an apartment building or building, on the extension line from the sound source (one example is the road surface of the viaduct 200) to the sound-absorbing panel, and for residents and users of such a building.

[0039] In contrast to this reference example, with a soundproof wall 100 equipped with a sound-absorbing panel 1 according to the first embodiment, as shown in Fig. 7, transmitted sound TS attempting to pass along an extension line I from the sound source SS to the sound-absorbing panel 1 can be blocked by the vertical partition material 22 installed inside the exterior material 10. As a result, it is possible to obtain a sound reduction effect even at a sound-receiving point B on the extension line I, such as in the building 350.

[0040] Furthermore, in the sound-absorbing panel 1, substantially the entire front panel 11 and substantially the entire back panel 12 are sound-transmitting surfaces. Therefore, a sound-reducing effect can be achieved for diffracted sound DS that diffracts near the upper edge of the sound-absorbing panel 1. This allows the sound-absorbing panel 1 to reduce sound at sound-receiving points A on the sides and below the soundproof wall 100, such as residents and users of the building 300 on the sides and below the soundproof wall. Furthermore, the sound-absorbing panel 1 has a third opening 16c in its top surface 14. This allows, for example, substantially the entire top surface 14 to become a sound-transmitting surface. The top surface 14 is located between the front panel 11 and the back panel 12 and connects the front-side upper corner 19a and the rear-side upper corner 19b. Therefore, the sound-absorbing distance at the top of the sound-absorbing panel 1 can be increased compared to when no openings are provided in the top surface 14. As a result of the increased sound-absorbing distance, the sound-reducing effect for diffracted sound DS can be further enhanced. In the sound-absorbing panel 1r according to the above-described reference example, no openings that allow sound to pass through are provided on the top surface.

[0041] With such a sound-absorbing panel 1, almost the entire front panel 11, almost the entire back panel 12, and almost the entire top surface 14 are each sound-transmitting surfaces, making it possible to absorb diffracted sound DS that affects residents below the viaduct 200. In addition, since the vertical partition material 22 is installed inside the exterior material 10, this part also functions as a sound-proofing plate, and therefore it is possible to reduce transmitted sound TS that affects residents located above the road surface of the viaduct 200.

[0042] Therefore, according to the first embodiment, a sound-absorbing panel 1 can be obtained that can simultaneously achieve sound reduction effects at each sound receiving point to the side and below the sound source SS, and on the extension line from the sound source SS to the sound-absorbing panel 1 installed on the top level of the soundproof wall 100.

[0043] Furthermore, according to the first embodiment, it is possible to obtain a soundproof wall 100 equipped with such a sound-absorbing panel 1, or a soundproof wall 100 equipped with a sound-absorbing panel 1 on the top row and intermediate sound-absorbing panels 3 arranged in at least one row in the vertical direction Z.

[0044] Such sound-absorbing panels 1 and soundproof walls 100 equipped with sound-absorbing panels 1 can be effectively used, for example, on roads and bridges over which automobiles and the like travel, and can reduce noise in a variety of locations, including urban areas, plains, mountainous areas, trenches, etc. Of course, the sound-absorbing panels 1 and soundproof walls 100 equipped with sound-absorbing panels 1 can be applied not only to roads over which automobiles and the like travel, but also to noise sources such as various railway tracks on which track-type, cable-type, and levitation-type railways run, and factories, schools, nurseries, and the like, where noise control measures that take into consideration the impact on nearby residents are required.

[0045] (Second embodiment) 8 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a second embodiment of the present invention. The schematic cross-section shown in FIG. 8 corresponds to the schematic cross-section shown in FIG.

[0046] As shown in FIG. 8 , the sound-absorbing panel 1b according to the second embodiment differs from the sound-absorbing panel 1 in that the vertical partition 22 is attached to the exterior cladding 10 in contact with the bottom surface 15 and extends partway between the top surface 14 and the bottom surface 15. The vertical partition 22 does not contact the top surface 14 or has a portion where it does not contact the top surface 14. This results in the sound-absorbing panel 1b having a gap between the upper surface of the vertical partition 22 and the top surface 14. An example of the gap is that it extends from one side edge of the sound-absorbing panel 1 to the other side edge along the first planar direction X. The sound-absorbing panel 1b has a gap such that the height of the vertical partition 22 in the vertical direction Z is smaller than the height of the front panel 11 in the vertical direction Z and the height of the back panel 12 in the vertical direction Z.

[0047] Furthermore, in the sound-absorbing panel 1b, the sound-absorbing material may be a single sound-absorbing material 2. In this case, the width of the gap in the first planar direction X is, for example, wider than the width of the single sound-absorbing material 2 in the first planar direction X. The single sound-absorbing material 2 is bent on the upper surface of the vertical partition material 22 via the gap, and is positioned respectively between the front panel 11 and the vertical partition material 22, between the upper surface of the vertical partition material 22 and the top surface portion 14, and between the back panel 12 and the vertical partition material 22.

[0048] The sound-absorbing panel 1b can provide the same advantages as the sound-absorbing panel 1. Furthermore, the sound-absorbing panel 1b can reduce the height of the vertical partition 22 in the up-down direction Z compared to the sound-absorbing panel 1, in which the vertical partition 22 is in contact with both the top surface 14 and the bottom surface 15. This allows the weight of the vertical partition 22 to be reduced. As a result, the sound-absorbing panel 1b can be made lighter than the sound-absorbing panel 1. The reduced weight of the sound-absorbing panel 1b can reduce the labor required by on-site workers, for example, when installing the sound-absorbing panel 1b on the top tier of the soundproof wall 100. In this way, the sound-absorbing panel 1b can provide the advantage of improving the workability of the installation work for the soundproof wall 100.

[0049] Furthermore, the sound-absorbing panel 1b allows the vertical partition material 22 to be made smaller than the sound-absorbing panel 1. This allows the sound-absorbing panel 1b to reduce the amount of metal and other materials used, which has the advantage of improving resource efficiency.

[0050] Furthermore, with sound-absorbing panel 1b, for example, whereas in the first embodiment two sound-absorbing materials, a first sound-absorbing material 2a and a second sound-absorbing material 2b, were required, it is possible to reduce this to a single sound-absorbing material 2. As a result, sound-absorbing panel 1b can reduce the number of parts compared to sound-absorbing panel 1. The reduced number of parts also offers the advantage that sound-absorbing panel 1b can reduce manufacturing costs compared to sound-absorbing panel 1, for example.

[0051] Such a sound-absorbing panel 1b can be manufactured, for example, as follows. First, for example, a front panel 11 having a bottom surface portion 15 and a vertical partition member 22, a back panel 12 having a top surface portion 14, and a single sound-absorbing material 2 are prepared. The vertical partition member 22 is attached to the bottom surface portion 15, for example.

[0052] Next, the unitary sound-absorbing material 2 is inserted between the front panel 11 and the vertical partition 22. Next, the unitary sound-absorbing material 2 is bent, for example, into a U-shape toward the bottom surface 15, using the top surface of the vertical partition 22 as a fulcrum. Next, the back panel 12 having the top surface 14 is placed over the unitary sound-absorbing material 2. Next, the top surface 14 of the back panel 12 is attached to the front panel 11, for example, by screwing, and the bottom surface 15 of the front panel 11 is attached to the back panel 12, for example, by screwing.

[0053] The sound-absorbing panel 1b can be manufactured, for example, in this manner. In the manufacturing method described above, the front panel 11 has the bottom surface portion 15 and the vertical partition member 22, and the back panel 12 has the top surface portion 14. Conversely, the back panel 12 may have the bottom surface portion 15 and the vertical partition member 22, and the front panel 11 may have the top surface portion 14. Furthermore, the bottom surface portion 15 may be a bottom panel to which the vertical partition member 22 is attached.

[0054] (Third embodiment) 9 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a third embodiment of the present invention. The schematic cross-section shown in FIG. 9 corresponds to the schematic cross-section shown in FIG.

[0055] As shown in Figure 9, the sound-absorbing panel 1c of the third embodiment differs from the sound-absorbing panel 1b in that, instead of the single sound-absorbing material 2, it includes a first sound-absorbing material 2a, a second sound-absorbing material 2b separate from the first sound-absorbing material 2a, and a third sound-absorbing material 2c separate from each of the first and second sound-absorbing materials 2a and 2b.

[0056] The first sound-absorbing material 2a is located between the front panel 11 and the vertical partition 22. The second sound-absorbing material 2b is located between the back panel 12 and the vertical partition 22. The third sound-absorbing material 2c is located between the top surface 14 and the upper surface of each of the first sound-absorbing material 2a, the upper surface of the vertical partition 22, and the upper surface of the second sound-absorbing material 2b.

[0057] The upper portion 23a of the sound-absorbing panel 1c does not have a vertical partition 22. This allows the sound-absorbing panel 1c to be divided into two portions, for example, the upper portion 23a and the lower portion 23b, which has the vertical partition 22. It is possible to use different sound-absorbing materials in the upper portion 23a and the lower portion 23b. Therefore, like the sound-absorbing panel 1c, the third sound-absorbing material 2c, which is installed in the exterior material 10 via the gap between the upper surface of the vertical partition 22 and the top surface 14, may be separate from the first and second sound-absorbing materials 2a and 2b.

[0058] Furthermore, if the third sound-absorbing material 2c is separate from the first and second sound-absorbing materials 2a and 2b, the density of the third sound-absorbing material 2c can be made different from that of the first sound-absorbing material 2a and the second sound-absorbing material 2b.

[0059] For example, let the density of the first sound-absorbing material 2a be "ρa," the density of the second sound-absorbing material 2b be "ρb," and the density of the third sound-absorbing material 2c be "ρc." As the density of a sound-absorbing material increases, the sound-absorbing effect tends to increase. In accordance with this tendency, the density ρc of the third sound-absorbing material 2c is set to be greater than the density ρa of the first sound-absorbing material 2a and the density ρb of the second sound-absorbing material 2b (ρc > ρa, and ρc > ρb).

[0060] When the density ρc is set to be greater than each of the densities ρa and ρb in this way, an additional advantage can be obtained in that the sound absorption effect of the diffracted sound DS diffracted near the upper edge of the sound-absorbing panel 1c can be further improved compared to when the third sound-absorbing material 2 has approximately the same density as each of the first and second sound-absorbing materials 2a and 2b. Note that in the sound-absorbing panel 1c, the density ρa is assumed to be the same as the density ρb (ρa = ρb), for example. However, the density ρa may be different from the density ρb (ρa ≠ ρb).

[0061] (Fourth embodiment) 10 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a fourth embodiment of the present invention. The schematic cross-section shown in FIG. 10 corresponds to the schematic cross-section shown in FIG.

[0062] As shown in FIG. 10 , the sound-absorbing panel 1d according to the fourth embodiment differs from the sound-absorbing panel 1c in that it further includes a horizontal partition 23 disposed in the space of the exterior material 10 in the second planar direction Y. Like the vertical partitions 22, the horizontal partitions 23 can be made of metal plate-like members, rubber or lead sheet-like members, or high-density fabric members (e.g., soundproof curtains or sound-blocking curtains). This embodiment will be described with reference to a case in which a metal plate-like member is used. The horizontal partition 23 connects the front panel 11 to the upper surfaces of the vertical partitions 22 and is located between the upper surface of the first sound-absorbing material 2a and the lower surface of the third sound-absorbing material 2c. The horizontal partition 23 can also connect the back panel 12 to, for example, the upper surface of the vertical partitions 22. The horizontal partition 23 can also connect the upper side of the vertical partitions 22 to the front panel 11 or the back panel 12.

[0063] When the front panel 11 and, for example, the upper surface of the vertical partition 22 are connected by a horizontal partition 23, as in the sound-absorbing panel 1d, the sound reflected by the vertical partition 22 can be reflected by the horizontal partition 23 toward the front panel 11 and, more specifically, toward the sound source SS. This makes it possible to further reduce noise at the sound-receiving point B. This advantage can be obtained, for example, by positioning the horizontal partition 23 at least between the upper surface of the first sound-absorbing material 2a and the lower surface of the third sound-absorbing material 2c.

[0064] Furthermore, even when a horizontal partition material 23 is further provided in the space defined by the exterior material 10, it is possible to make the density ρc of the third sound-absorbing material 2c greater than the density ρa of the first sound-absorbing material 2a and the density ρb of the second sound-absorbing material 2b (ρc>ρa, and ρc>ρb).

[0065] (Fifth embodiment) 11 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a fifth embodiment of the present invention. The schematic cross-section shown in FIG. 11 corresponds to the schematic cross-section shown in FIG.

[0066] As shown in Fig. 11, the sound-absorbing panel 1e according to the fifth embodiment differs from the sound-absorbing panel 1c in that a protruding portion 24 is provided on the upper portion of the sound-absorbing panel 1e. The protruding portion 24 protrudes further toward the rear side than the lower portion of the sound-absorbing panel 1e. In the sound-absorbing panel 1e, for example, the thickness T1 of the top surface portion 14 along the second planar direction Y is greater than the thickness T2 of the bottom surface portion 15 along the second planar direction. The third sound-absorbing material 2c is disposed on the protruding portion 24.

[0067] The sound-absorbing effect of the sound-absorbing panel 1e on diffracted sound DS diffracted near the upper edge thereof increases, for example, as the thickness of the sound-absorbing material along the top surface 14 increases. This is because, when a third opening 16c is provided in the top surface 14 of the sound-absorbing panel 1e and the top surface 14 is used as a sound-absorbing portion, the sound-absorbing portion becomes longer. In accordance with this trend, a protruding portion 24 is provided on the upper part of the sound-absorbing panel 1e, and the third sound-absorbing material 2c is disposed within the space of the protruding portion 24 along the second planar direction Y, for example, over the entire space of the protruding portion 24. As a result, the sound-absorbing portion of the sound-absorbing panel 1e is longer than that of the sound-absorbing panel 1c, for example, and the sound-absorbing effect of the sound-absorbing panel 1e on diffracted sound DS can be further improved.

[0068] Furthermore, it is preferable that the protruding portion 24 of the sound-absorbing panel 1e protrudes rearward toward the back panel 12. This prevents the protruding portion 24 from protruding toward the road surface, thereby preventing, for example, contact between the sound-absorbing panel 1e and a vehicle or obstructing vehicle travel.

[0069] Such a sound-absorbing panel 1e has the advantage that it improves the sound-absorbing effect of diffracted sound DS, while also providing a sound-proof wall 100 that maintains safety when installed on the top level of the sound-proof wall 100.

[0070] Furthermore, it is also possible to provide a fourth opening 16d on the underside of the overhanging portion 24. By providing the fourth opening 16d on the underside of the overhanging portion 24, the underside of the overhanging portion 24 can also be used as a sound-absorbing portion. This allows the underside of the overhanging portion 24 to further absorb diffracted sound DS that occurs at the corner where the underside of the overhanging portion 24 extending in the second planar direction Y and the back surface of the overhanging portion 24 extending in the up-down direction Z intersect. As a result, a sound-absorbing panel 1e provided with an overhanging portion 24 that protrudes toward the back side can further advantageously achieve a higher sound reduction effect against diffracted sound DS at sound-receiving points A located to the sides and below the soundproof wall 100, for example, compared to a case in which the fourth opening 16d is not provided.

[0071] (Sixth embodiment) 12 is a schematic cross-sectional view showing an example of a sound-absorbing panel according to a sixth embodiment of the present invention. The schematic cross-section shown in FIG.

[0072] As shown in FIG. 12, a sound absorbing panel 1f according to the sixth embodiment differs from the sound absorbing panel 1 in that the first opening 16a has a louvered shape.

[0073] Since the sound-absorbing panel 1f is placed on the topmost level of the soundproof wall 100, noise from vehicles and the like is emitted from below the sound-absorbing panel 1f when viewed from the front. By making the first opening 16a louver-shaped, it becomes possible to efficiently capture sound emitted from below the sound-absorbing panel 1f through the first opening 16a, thereby improving sound absorption.

[0074] Furthermore, the louver shape has an eave-like portion above the first opening 16a, which has the advantage that rainwater and the like are less likely to penetrate into the interior of the exterior material 10.

[0075] The sixth embodiment can be combined with the first embodiment as well as any of the second to fifth embodiments.

[0076] Seventh embodiment Figures 13(a) to 13(c) are schematic cross-sectional views showing examples of a sound-absorbing panel according to a seventh embodiment of the present invention. The schematic cross-sections shown in Figures 13(a) to 13(c) correspond to the schematic cross-section shown in Figure 2.

[0077] <Seventh embodiment: First example> As shown in Figure 13(a), the sound-absorbing panel 1ga according to the first example of the seventh embodiment differs from the sound-absorbing panel 1 in that the surfaces of the first sound-absorbing material 2a and the second sound-absorbing material 2b are covered with a breathable water-repellent material 21.

[0078] If the third opening 16c is provided in the top surface 14, rainwater or the like may penetrate through the third opening 16c into the first sound-absorbing material 2a and the second sound-absorbing material 2b, potentially reducing sound-absorbing performance. To address this issue, covering the surfaces of the first sound-absorbing material 2a and the second sound-absorbing material 2b with a breathable water-repellent material 21 can prevent rainwater or the like from penetrating into the first sound-absorbing material 2a and the second sound-absorbing material 2b, thereby maintaining sound-absorbing performance. Although not shown, even if the top surface 14 of the exterior covering is not provided, covering at least the upper surfaces of the first sound-absorbing material 2a and the second sound-absorbing material 2b with a breathable water-repellent material 21 can prevent rainwater or the like from penetrating into the first sound-absorbing material 2a and the second sound-absorbing material 2b, thereby maintaining sound-absorbing performance. This also applies to the eighth and ninth embodiments described below.

[0079] The water-repellent member 21 is formed by, for example, treating the surface layer of the first sound-absorbing material 2a and the surface layer of the second sound-absorbing material 2b with a water-repellent treatment, or by treating the surface of the first sound-absorbing material 2a and the surface of the second sound-absorbing material 2b with a water-repellent treatment. This can be achieved by covering it with a water-repellent cloth or the like.

[0080] Furthermore, the water-repellent member 21 of the sound-absorbing panel 1ga is configured to cover, for example, substantially the entire surface of each of the first sound-absorbing material 2a and the second sound-absorbing material 2b. However, it is sufficient that the water-repellent member 21 covers at least the surface of each of the first sound-absorbing material 2a and the second sound-absorbing material 2b that faces the top surface 14. This configuration also makes it possible to prevent a decrease in sound-absorbing performance due to the penetration of rainwater, etc.

[0081] <Seventh embodiment: Second example> As shown in Figure 13(b), the sound-absorbing panel 1gb according to the second example of the seventh embodiment differs from the sound-absorbing panel 1 in that the first sound-absorbing material 2a and the second sound-absorbing material 2b each contact the top surface portion 14.

[0082] When the third opening 16c is provided in the top surface 14, if there are gaps between the top surface 14 and each of the first and second sound-absorbing materials 2a and 2b, rainwater or the like may seep into the sound-absorbing panel gb through the gaps and accumulate, potentially causing corrosion of the exterior cladding 10 and deterioration of the first and second sound-absorbing materials 2a and 2b. For example, by arranging each of the first and second sound-absorbing materials 2a and 2b in contact with the top surface 14 and eliminating any gaps between the first and second sound-absorbing materials 2a and 2b and the top surface 14, it is possible to prevent water from accumulating in the gaps and prevent accumulated rainwater or the like from seeping into the sound-absorbing panel 1gb. Even in this manner, sound-absorbing performance can be maintained.

[0083] <Seventh embodiment: third example> 13(c), a sound-absorbing panel 1gc according to a third example of the seventh embodiment differs from the sound-absorbing panel 1gb in that the first and second sound-absorbing materials 2a and 2b, at least the surfaces facing the top surface 14 of which are covered with a breathable water-repellent member 21, are in contact with the top surface 14. In this way, it is possible to combine the first and second examples.

[0084] According to the sound-absorbing panel 1gc, the first and second sound-absorbing materials 2a and 2b, whose surfaces facing the top surface 14 are covered with a breathable water-repellent material 21, come into contact with the top surface 14, so that water retention in the gaps can be suppressed, and since the surfaces of the first and second sound-absorbing materials 2a and 2b are water-repellent, the sound-absorbing performance can be maintained even better.

[0085] (Eighth embodiment) Figures 14(a) to 14(c) are schematic cross-sectional views showing an example of a sound-absorbing panel according to an eighth embodiment of the present invention. The schematic cross-sections shown in Figures 14(a) to 14(c) correspond to the schematic cross-section of the vicinity of the top surface 14 of the sound-absorbing panel 1b shown in Figure 8.

[0086] <Eighth embodiment: First example> As shown in Figure 14(a), the sound-absorbing panel 1ha according to the first example of the eighth embodiment differs from the sound-absorbing panel 1b in that at least the surface of the single sound-absorbing material 2 facing the top surface portion 14 is covered with a breathable water-repellent material 21.

[0087] Like the sound-absorbing panel 1ha, it is also possible to combine the second embodiment with the first example of the seventh embodiment.

[0088] The sound-absorbing panel 1ha has the same advantages as the sound-absorbing panel 1b of the second embodiment, and also has the advantage of being able to suppress the deterioration of sound-absorbing performance due to the penetration of rainwater, etc., like the sound-absorbing panel 1ga.

[0089] <Eighth embodiment: second example> As shown in FIG. 14(b), a sound-absorbing panel 1hb according to a second example of the eighth embodiment differs from the sound-absorbing panel 1b in that the single sound-absorbing material 2 is in contact with the top surface portion .

[0090] Like the sound-absorbing panel 1hb, it is also possible to combine the second embodiment with the second example of the seventh embodiment.

[0091] The sound-absorbing panel 1hb provides the same advantages as the sound-absorbing panel 1b of the second embodiment, and also provides the advantage that, like the sound-absorbing panel 1gb, it can suppress water accumulation in gaps and prevent accumulated rainwater and the like from entering the interior of the sound-absorbing panel 1hb.

[0092] <Eighth embodiment: third example> As shown in Figure 14(c), the sound-absorbing panel 1hc according to the third example of the eighth embodiment differs from the sound-absorbing panel 1hb in that a single sound-absorbing material 2, at least the surface facing the top surface 14 of which is covered with a breathable water-repellent material 21, is in contact with the top surface 14.

[0093] Like the sound-absorbing panel 1hc, it is also possible to combine the second embodiment with the third example of the seventh embodiment.

[0094] The sound-absorbing panel 1hc offers the same advantages as the sound-absorbing panel 1b of the second embodiment, and also offers the advantage that, like the sound-absorbing panel 1gc, it can prevent water from accumulating in gaps and, since the surface of the single sound-absorbing material 2 is water-repellent, it can maintain sound-absorbing performance even better.

[0095] (Ninth embodiment) Figures 15(a) to 15(c) are schematic cross-sectional views showing examples of a sound-absorbing panel according to a ninth embodiment of the present invention. The schematic cross-sections shown in Figures 15(a) to 15(c) correspond to the schematic cross-section of the sound-absorbing panel 1c shown in Figure 9 near the top surface 14.

[0096] <Ninth embodiment: First example> As shown in Figure 15(a), the sound-absorbing panel 1ia according to the first example of the ninth embodiment differs from the sound-absorbing panel 1c in that at least the surface of the third sound-absorbing material 2c facing the top surface portion 14 is covered with a breathable water-repellent material 21.

[0097] Like the sound-absorbing panel 1ia, it is also possible to combine the third embodiment with the first example of the seventh embodiment.

[0098] The sound-absorbing panel 1ia has the same advantages as the sound-absorbing panel 1c of the third embodiment, and also has the advantage of being able to suppress the deterioration of sound-absorbing performance due to the penetration of rainwater, etc., like the sound-absorbing panel 1ga.

[0099] <Ninth embodiment: Second example> As shown in FIG. 15(b), a sound-absorbing panel 1ib according to a second example of the ninth embodiment differs from the sound-absorbing panel 1c in that a third sound-absorbing material 2c contacts the top surface portion .

[0100] Like the sound-absorbing panel 1ib, it is also possible to combine the third embodiment with the second example of the seventh embodiment.

[0101] The sound-absorbing panel 1ib offers the same advantages as the sound-absorbing panel 1c of the third embodiment, and also offers the advantage that, like the sound-absorbing panel 1gb, it can suppress water accumulation in gaps and prevent accumulated rainwater and the like from entering the interior of the sound-absorbing panel 1ib.

[0102] <Ninth embodiment: third example> As shown in Figure 15(c), the sound-absorbing panel 1ic according to the third example of the ninth embodiment differs from the sound-absorbing panel 1ib in that the third sound-absorbing material 2c, at least the surface facing the top surface 14 of which is covered with a breathable water-repellent material 21, is in contact with the top surface 14.

[0103] Like the sound-absorbing panel 1ic, it is also possible to combine the third embodiment with the third example of the seventh embodiment.

[0104] The sound-absorbing panel 1ic has the same advantages as the sound-absorbing panel 1c of the third embodiment, and also has the advantage that, like the sound-absorbing panel 1gc, it can prevent water from accumulating in gaps and, since the surface of the single sound-absorbing material 2 is water-repellent, it can maintain sound-absorbing performance even better.

[0105] Each of the seventh to ninth embodiments can be combined with the sixth embodiment.

[0106] As explained in the above embodiments, according to the embodiments of the present invention, it is possible to provide sound-absorbing panels that can achieve sound reduction effects to the sides and below the sound source, as well as on the extension line of the sound-absorbing panel installed on the top level of the soundproof wall from the sound source.

[0107] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. For example, while intermediate sound-absorbing panels 3 are illustrated in Figures 4 and 5, other panels, such as translucent panels or concrete panels, may also be used. These embodiments can also be implemented in appropriate combinations. Furthermore, the present invention can be implemented in various novel forms in addition to the above-described embodiments. Therefore, various omissions, substitutions, and modifications are possible in each of the above-described embodiments without departing from the spirit and scope of the present invention. Such novel forms and modifications are within the scope and spirit of the present invention, as well as within the scope of the claims and equivalents of the claims. [Explanation of symbols]

[0108] 1: Sound-absorbing panel (first embodiment) 1b: Sound-absorbing panel (second embodiment) 1c: Sound-absorbing panel (third embodiment) 1d: Sound-absorbing panel (fourth embodiment) 1e: Sound-absorbing panel (fifth embodiment) 1f: Sound-absorbing panel (sixth embodiment) 1ga to 1gc: Sound-absorbing panels (seventh embodiment: first to third examples) 1ha to 1hc: Sound-absorbing panel (8th embodiment: 1st to 3rd examples) 1ia to 1ic: Sound-absorbing panels (9th embodiment: 1st to 3rd examples) 10: Exterior materials 11: Front plate (front part) 12: Back plate (back part) 14:Top section 15: Bottom part 16a: 1st opening 16b: 2nd opening 16c: 3rd opening 16d: 4th opening 19a: Upper corner of front side 19b: Back side upper edge corner 1r: Sound-absorbing panel (reference example) 11r:Front version 12r: Back plate 2: Single sound-absorbing material 2a: 1st sound absorbing material 2b:Second sound absorbing material 2c: Third sound-absorbing material 21: Water-repellent material 22: Vertical partition material 23: Horizontal partition material 23a: Upper part 23b: Lower part 24: Overhang 3: Intermediate sound-absorbing panel 31: Front plate (front part) 32: Back plate (back part) 36: 4th opening 4: Strut 100: Soundproof wall (first embodiment) 100r: Soundproof wall (example) 150: Wall parapet 200: Viaduct 201: Viaduct wall parapet 300: Building 350: Building T1: Thickness of the top surface portion 14 along the second plane direction Y T2: Thickness of the bottom surface portion 15 along the second plane direction Y DS: Diffraction sound TS: Transmitted sound SS:Sound source I: Extension line

Claims

1. A sound-absorbing panel installed at the top of a soundproof wall, an exterior material having a front surface facing a sound source, a back surface, and a top surface positioned above the sound-absorbing panel; A vertical partition member that is installed inside the exterior material and positioned between the front portion and the back portion in the vertical direction; a sound-absorbing material installed inside the exterior material, a first opening and a second opening are provided in the entire front portion and the entire rear portion, respectively; a third opening is provided in the entire top surface portion, the vertical partition member is any one of a metal plate-shaped member, a rubber or lead sheet-shaped member, and a high-density cloth member; the top surface portion is located between the front surface portion and the rear surface portion, and connects the front surface upper edge corner portion and the rear surface upper edge corner portion; the exterior material has a bottom surface portion facing the top surface portion in the up-down direction, the vertical partition member is disposed in contact with the bottom surface portion and is embedded in the exterior material, and is provided partway between the top surface portion and the bottom surface portion, The sound absorbing material is It consists of a single sound-absorbing material, The single sound-absorbing material is bent between the upper surface of the vertical partition member and the top surface portion, and is positioned between the front surface portion and the vertical partition member, between the upper surface of the vertical partition member and the top surface portion, and between the back surface portion and the vertical partition member. A sound-absorbing panel characterized by:

2. At least the surface of the single sound-absorbing material facing the top surface is covered with a breathable, water-repellent material.

2. The sound-absorbing panel according to claim 1,

3. The single sound-absorbing material is in contact with the top surface portion.

2. The sound-absorbing panel according to claim 1,

4. The first opening has a louver shape. The sound-absorbing panel according to any one of claims 1 to 3,

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