JP7175734B2 - sound absorbing panel - Google Patents

Description

The present invention relates to sound absorbing panels.

The sound-absorbing panels installed at the top of the soundproof wall attenuate not only the reflected sound between the walls, but also the sound (diffracted sound) that circulates from the upper side of the soundproof wall. Thereby, the noise on the back side of the soundproof wall, which is the sound receiving side, can be reduced. Patent Documents 1 to 4 are known as examples of sound absorbing panels.

JP 2014-101747 A WO2015/114929 JP 2017-227680 A JP 2016-211344 A

All of the sound absorbing panels described in Patent Documents 1 to 4 are installed on the uppermost level of the soundproof wall. In the sound absorbing panels described in Patent Documents 1 to 4, a sound transmitting surface having a large number of sound insertion holes is provided on each of the front portion on the sound source side and the back portion on the sound receiving side. Patent Documents 1 to 4 all use the "edge effect suppression technology", and the diffracted sound diffracted near the upper edge of the sound absorbing panel is absorbed and attenuated through the sound insertion hole to further improve the sound reduction effect. It aims at further improvement.

However, in the sound absorbing panels described in Patent Documents 1 to 4, the entire back surface is a sound transmitting surface, and although the diffracted sound can be reduced, the sound (transmitted sound) that passes through the sound absorbing panel can be reduced. cannot be reduced. Therefore, if a sound receiving point is located on an extension line connecting the sound source and the sound absorbing panel installed on the top of the soundproof wall, the noise cannot be reduced at this sound receiving point.

The present invention has been made in view of the above circumstances, and its purpose is to provide sound receiving points on the extension line of the sound absorbing panel installed on the side and below the sound source and on the uppermost level of the sound source and the soundproof wall. On the other hand, it is an object of the present invention to provide a sound absorbing panel capable of obtaining a sound reduction effect.

A sound absorbing panel according to a first aspect of the present invention is a sound absorbing panel that is installed on the topmost stage of a soundproof wall, and includes an exterior material having a front portion facing a sound source and a back portion facing a sound receiving side, and the exterior material. a sound absorbing material embedded in the front portion, wherein the front portion includes a first opening provided throughout the front portion, and the back portion includes a second opening provided only in an upper portion of the back portion and a sound insulation surface for reflecting transmitted sound is provided on a straight line connecting the sound source and the sound receiving point .

A sound absorbing panel according to a second invention is characterized in that, in the first invention, the exterior material has a top surface portion, and the top surface portion is provided with a third opening.

A sound absorbing panel according to a third invention is the sound absorbing panel according to the first invention, wherein at least the surface of the sound absorbing material located at the first opening or the second opening is covered with an air-permeable water-repellent member. characterized by

A sound absorbing panel according to a fourth invention is characterized in that, in the first or second invention, at least an upper surface of the sound absorbing material is covered with an air-permeable water-repellent member.

A sound absorbing panel according to a fifth invention is characterized in that, in the second invention, the sound absorbing material is in contact with the top surface portion.

A sound absorbing panel according to a sixth aspect of the invention is characterized in that, in any one of the first to fifth aspects of the invention, a vertical partition member provided in the vertical direction is provided in the exterior member.

A sound absorbing panel according to a seventh invention is characterized in that, in the second invention, a vertical partition member extending downward from the top surface portion is provided so as to overlap the back surface portion of the lower portion of the second opening.

A sound absorbing panel according to an eighth aspect of the invention is characterized in that, in any one of the first to seventh aspects of the invention, horizontal partition members are provided in the exterior member in the plane direction.

A sound absorbing panel according to a ninth invention is the sound absorbing panel according to the eighth invention, wherein the sound absorbing material is arranged above and below the horizontal partition, and the sound absorbing material arranged above has the density of the sound absorbing material and the At least one thickness of the sound absorbing material in the planar direction of the sound absorbing panel is larger than the sound absorbing material arranged below.

A sound absorbing panel according to a tenth invention is the sound absorbing panel according to any one of the first to ninth inventions, wherein the upper part of the sound absorbing panel is provided with a protruding part that protrudes toward the back side from the lower part, and the sound absorbing material is further arranged on the projecting portion.

A sound absorbing panel according to an eleventh invention is characterized in that, in the tenth invention, at least one of the density and the thickness in the plane direction of the sound absorbing panel is larger than the sound absorbing material disposed on the front side or below.

A sound absorbing panel according to a twelfth invention is characterized in that, in any one of the first to eleventh inventions, there is an air layer between the sound absorbing material and the back portion .

A sound absorbing panel according to a thirteenth invention is characterized in that, in any one of the first to twelfth inventions, the first opening has a louver shape.

A sound absorbing panel according to a fourteenth invention is characterized in that, in any one of the first to thirteenth inventions, the second opening has a single slit structure.

According to the first to fourteenth inventions, a sound reduction effect can be obtained for each sound receiving point on the extension line of the sound absorbing panel installed on the side and below the sound source and on the uppermost step between the sound source and the soundproof wall. Acoustic panels can be provided.

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 rear view showing an example of the sound absorbing panel according to the first embodiment of the invention. FIG. 2 is a schematic cross-sectional view taken along line II--II in FIGS. 1(a) and 1(b). FIG. 3 is a schematic front view showing an example of a soundproof wall using the sound absorbing panel according to the first embodiment of the invention. FIG. 4 is a schematic rear view showing an example of a soundproof wall using the sound absorbing panel according to the first embodiment of the invention. FIG. 5(a) is a schematic front view showing an example of the sound absorbing panel according to the first embodiment of the present invention. FIG. 5(b) is a schematic rear view showing an example of the sound absorbing panel according to the first embodiment of the invention. FIG. 6 is a schematic diagram showing a state of sound insulation by a soundproof wall provided with sound absorbing panels according to a reference example. FIG. 7 is a schematic diagram showing the state of sound insulation by the soundproof wall provided with the sound absorbing panel according to the first embodiment of the present invention. FIG. 8A is an enlarged schematic cross-sectional view showing an enlarged top surface portion of the sound absorbing panel according to the first embodiment. 8(b) to 8(e) are enlarged schematic cross-sectional views showing an enlarged top surface portion of the sound absorbing panel according to the second embodiment. FIG. 9 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the third embodiment of the invention. FIG. 10 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the fourth embodiment of the invention. FIG. 11 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the fifth embodiment of the invention. FIG. 12 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the sixth embodiment of the invention. FIG. 13 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the seventh embodiment of this invention. FIG. 14 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the eighth embodiment of the invention. FIG. 15 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the ninth embodiment of the invention. FIG. 16 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the tenth embodiment of the invention. FIG. 17(a) is a schematic rear view showing an example of a sound absorbing panel according to the eleventh embodiment of the present invention. FIG. 17(b) is a schematic cross-sectional view along line XVIIB--XVIIB in FIG. 17(a).

Some embodiments of the present invention will be described below with reference to the drawings. In each figure, the vertical direction is the vertical direction Z and intersects the vertical direction Z. For example, one plane direction perpendicular to the vertical direction is the first plane direction X, and the vertical direction Z and the first plane direction X are intersected. A second planar direction Y is another orthogonal planar direction. Further, in each drawing, common parts are denoted by common reference numerals, and overlapping descriptions are omitted.

(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 rear view showing an example of the sound absorbing panel according to the first embodiment of the invention. FIG. 2 is a schematic cross-sectional view taken along line II--II in FIGS. 1(a) and 1(b).

As shown in FIGS. 1A to 2, the sound absorbing panel 1 according to the first embodiment includes an exterior material 10 and a sound absorbing material 2. As shown in FIGS. The exterior material 10 has, for example, a front plate (front portion) 11 and a rear plate (back portion) 12 . The front plate 11 faces the sound source side. The back plate 12 faces the sound receiving side. The front plate 11 and the rear plate 12 are separated in the second plane direction Y and face each other. An upper portion of at least one of the front plate 11 and the rear plate 12 is bent in, for example, an L shape to form a top surface portion 14 . A separate top plate may be provided as the top surface portion 14 . A lower portion of at least one of the front plate 11 and the rear plate 12 is bent, for example, in an L shape to form a bottom portion 15 . A separate bottom plate may be provided as the bottom portion 15 . Also, the bottom portion 15 may be omitted. One example of the front plate 11 is, for example, an aluminum plate. One example of the back plate 12 is, for example, a highly weather-resistant plated steel plate.

The sound absorbing material 2 is arranged in a space surrounded by each of the front plate 11 , the rear plate 12 , the top surface portion 14 and the bottom surface portion 15 . As a result, the sound absorbing material 2 is embedded in the exterior material 10 . The sound absorbing material 2 is, for example, polyester fiber nonwoven fabric or glass wool.

The front plate 11 is provided with a plurality of first openings 16a through which sound is transmitted. These first openings 16 a are provided throughout the front plate 11 . The term “whole” used in this specification not only indicates a complete whole, but also indicates a substantial or practical whole (substantially the whole) as shown in FIG. 1(a). shall be The shape of each of the first openings 16a in plan view is, for example, circular. The back plate 12 is provided with a plurality of second openings 16b that transmit sound. These second openings 16b are locally provided only in the upper portion of the back plate 12 (on the top surface portion 14 side). The shape of each of the second openings 16b in plan view is, for example, circular.

FIG. 3 is a schematic front view showing an example of a soundproof wall using the sound absorbing panel according to the first embodiment of the invention. FIG. 4 is a schematic rear view showing an example of a soundproof wall using the sound absorbing panel according to the first embodiment of the invention.

As shown in FIGS. 3 and 4 , the soundproof wall 100 includes sound absorbing panels 1 , intermediate sound absorbing panels 3 , and struts 4 . The supports 4 are erected at designed intervals, for example, on the balustrade 150 of the road. The intermediate sound absorbing panels 3 are arranged, for example, along the first plane direction X and in the vertical direction Z between the columns 4 . The sound absorbing panel 1 is installed on the uppermost stage of a soundproof wall 100 in which a plurality of intermediate sound absorbing panels 3 are arranged in the vertical direction Z. Note that the intermediate sound absorbing panel 3 may be installed along the first planar direction X in only one stage. Alternatively, the intermediate sound absorbing panel 3 may be omitted, and only the sound absorbing panels 1 may be arranged side by side along the first plane direction X and installed.

The intermediate sound-absorbing panel 3, like the sound-absorbing panel 1, includes an exterior material and a sound-absorbing material. Like the sound absorbing panel 1 , the exterior material of the intermediate sound absorbing panel 3 also has, for example, a front plate (front portion) 31 and a rear plate (back portion) 32 . The front plate 31 faces the sound source side. The back plate 32 faces the sound receiving side. A sound absorbing material (not shown) is embedded in the exterior material. The front plate 31 is provided with a plurality of fourth openings 36 that transmit sound. These fourth openings 36 are provided entirely in the front plate 31 . The fourth opening 36 has, for example, a louver shape. In contrast to the front plate 31, the rear plate 32 is not provided with an opening through which sound can pass. As a result, on the rear side of the soundproof wall 100, the second openings 16b that transmit sound are locally provided only in the upper part of the soundproof wall 100 and the upper part of the sound absorbing panel 1. FIG.

FIG. 5(a) is a schematic front view showing an example of the sound absorbing panel according to the first embodiment of the present invention. FIG. 5(b) is a schematic rear view showing an example of the sound absorbing panel according to the first embodiment of the invention.

As shown in FIGS. 5(a) and 5(b), it is assumed that the area of the front plate 11 provided with the first opening 16a is the first sound transmitting surface 17a. Also, the area of the rear plate 12 where the second opening 16b is provided is assumed to be the second sound transmitting surface 17b. The first sound transmission surface 17 a is set on the entire front plate 11 . A width W2 of the second sound transmission surface 17b along the first planar direction X is substantially equal to a width W1 of the first sound transmission surface 17a along the first planar direction X (W2≈W1).

On the other hand, the length L2 along the vertical direction Z of the second sound transmitting surface 17b is smaller than the length L1 along the vertical direction Z of the first sound transmitting surface 17a (L2<L1). By setting "L2<L1" in this way, the back plate 12 can have a non-opening region without the second opening 16b. The non-opening area becomes the sound insulation surface 18 . Thereby, the back plate 12 of the sound absorbing panel 1 can be provided with both the second sound transmission surface 17b and the sound insulation surface 18 . The second sound transmission surface 17b faces the first sound transmission surface 17a with the sound absorbing material 2 interposed therebetween. The sound insulation surface 18 faces the first sound transmission surface 17a with the sound absorbing material 2 interposed therebetween.

According to the soundproof wall 100 provided with such a sound absorbing panel 1, for example, the following advantages can be obtained.

FIG. 6 is a schematic diagram showing a state of sound insulation by a soundproof wall provided with sound absorbing panels according to a reference example. FIG. 7 is a schematic diagram showing the state of sound insulation by the soundproof wall provided with the sound absorbing panel according to the first embodiment of the present invention. The soundproof wall is provided, for example, on the balustrade 201 of the viaduct 200 .

As shown in FIG. 6, in the sound absorbing panel 1r according to the reference example, an opening through which sound is transmitted is provided throughout each of the front plate 11r and the rear plate 12r. In the soundproof wall 100r having such a sound absorbing panel 1r, the diffracted sound DS diffracted in the vicinity of the upper edge of the sound absorbing panel 1r is absorbed through the opening, thereby attenuating the diffracted sound DS. As a result, the sound receiving points A located on the sides and below the soundproof wall 100r, for example, the residents and users of the building 300 located on the sides and below the soundproof wall 100r, receive diffracted sound from the sound absorbing panel 1r. A sound reduction effect for DS can be obtained.

That is, when reducing the diffracted sound DS that tends to be diffracted in the vicinity of the upper edge of the sound absorbing panel 1r installed on the uppermost stage, the "edge effect suppression technology" is used. With this technology, when sound passes through a thick wall, it becomes a wavefront of concentric circles centering on the upper edge corner 19a on the front side and the upper edge corner 19b on the back side, as if the sound source were at the center of the concentric circles. Therefore, sound can be effectively absorbed by arranging a function capable of absorbing sound in this vicinity.

However, transmitted sound TS is generated on the extension line I of the sound source SS to the sound absorbing panel 1r installed at the top of the soundproof wall 100r. For this reason, the sound receiving point B on the extension line I, for example, the sound source (one example is the road surface of the viaduct 200) to the building 350 on the extension line of the sound absorbing panel, for example, residents and users of apartments, buildings, etc. , it is difficult to expect a sound reduction effect for the transmitted sound TS.

In contrast to this reference example, according to the soundproof wall 100 including the sound absorbing panel 1 according to the first embodiment, as shown in FIG. , and the sound insulation surface 18 . Therefore, the sound insulation surface 18 can reflect the transmitted sound TS that is about to be transmitted along the extension line I from the sound source SS to the sound absorbing panel 1 . As a result, the sound receiving point B on the extension line I, for example, the sound source SS to the building 350 on the extension line I of the sound absorbing panel 1 installed on the top of the soundproof wall 100, for example, residents of apartments, buildings, etc. Also, the sound absorbing panel 1 can provide a sound reduction effect to the user and the like.

Further, the back plate 12 has a second sound transmission surface 17 b extending from the back side upper edge corner 19 b where the back plate 12 and the top surface 14 intersect to the upper part of the sound insulation surface 18 . As a result, the sound-receiving points A located on the sides and below the soundproof wall 100, for example, the residents and users of the building 300 located on the sides and below the soundproof wall 100, are also affected by the sound-reducing effect of the sound-absorbing panel 1. is obtained.

In this way, the sound-absorbing panel 1 has the first sound-transmitting surface 17a and the second sound-transmitting surface 17b on the upper part of the front side and the rear side, respectively, thereby affecting residents under the elevated bridge 200. In addition to being able to absorb the diffracted sound DS, since the lower portion of the back plate 12 does not have the second sound transmission surface 17b, this portion also functions as a sound insulating plate, so that residents located above the road surface of the viaduct 200 are not affected. The transmitted sound TS can also be reduced.

Therefore, according to the first embodiment, for each sound receiving point on the side and below the sound source SS and on the extension line of the sound absorbing panel 1 installed on the uppermost stage from the sound source SS to the soundproof wall 100, the sound is reduced. It is possible to obtain the sound absorbing panel 1 that can obtain the effects at the same time.

Further, according to the first embodiment, the soundproof wall 100 having such a sound absorbing panel 1, or the soundproof wall 100 having the sound absorbing panel 1 on the uppermost stage and at least one middle sound absorbing panel 3 arranged in the vertical direction Z. can be obtained.

Such a sound absorbing panel 1 and a soundproof wall 100 equipped with the sound absorbing panel 1 can be effectively used, for example, on roads, bridges, etc. on which automobiles travel, and furthermore, noise can be effectively reduced in urban areas, plains, and mountains. It can be reduced at various locations, such as pits, pits, and cuts. Of course, the sound absorbing panel 1 and the soundproof wall 100 equipped with the sound absorbing panel 1 are not limited to roads on which automobiles and the like run, but also on various railroad tracks on which track-type, cableway-type, and levitation-type railways run, and for nearby residents. It can also be applied to noise sources such as factories, schools, nursery schools, etc., where careful noise countermeasures are required.

(Second embodiment)
FIG. 8A is an enlarged schematic cross-sectional view showing an enlarged top surface portion of the sound absorbing panel according to the first embodiment. 8(b) to 8(e) are enlarged schematic cross-sectional views showing an enlarged top surface portion of the sound absorbing panel according to the second embodiment. 8(a) to 8(e) correspond to enlarged views of the dashed frame VIII in FIG.

<Second Embodiment: First Example>
As shown in FIG. 8A, the sound absorbing panel 1 according to the first embodiment is an example in which the top surface portion 14 is not provided with an opening.

As in the sound absorbing panel 1ba according to the first example shown in FIG. 8B, the top panel 14 may be provided with a third opening 16c. As described in the first embodiment, the diffracted sound that tries to diffract near the upper edge of the sound absorbing panel 1ba installed on the uppermost stage is diffracted at two points: the front-side upper edge corner portion 19a and the rear-side upper edge corner portion 19b. can be regarded as a state in which the sound source is in Therefore, by providing the third opening 16c also in the top surface 14, the diffracted sound can be absorbed more efficiently.

<Second Embodiment: Second Example>
At least the upper surface of the sound absorbing material 2 may be covered with a water-repellent member 21 having air permeability, like a sound absorbing panel 1bb according to a second example shown in FIG. 8(c). If the top surface portion 14 is provided with the openings 16c, rainwater or the like may permeate the sound absorbing material 2 through the third openings 16c, degrading the sound absorbing performance. By covering at least the upper surface of the sound absorbing material 2 with the air-permeable water-repellent member 21, it is possible to prevent permeation of rainwater or the like into the sound absorbing material 2 and maintain the sound absorbing performance. Also, although not shown, even if the exterior material 10 does not have the top surface 14, by covering at least the upper surface of the sound absorbing material 2 with the air-permeable water-repellent member 21, rainwater, etc. to the sound absorbing material 2 can be prevented. permeation can be prevented, and the sound absorption performance can be maintained.

The water-repellent member 21 can be obtained, for example, by subjecting the surface layer of the sound absorbing material 2 to a water-repellent treatment or by covering the surface of the sound absorbing material 2 with a water-repellent cloth or the like.

<Second Embodiment: Third Example>
You may make it the sound-absorbing material 2 contact|connect the top surface part 14 like the sound-absorbing panel 1bc which concerns on the 3rd example shown in FIG.8(d). When the top surface portion 14 is provided with the third opening portion 16c, if there is a gap between the top surface portion 14 and the sound absorbing material 2, rainwater or the like enters the inside of the sound absorbing panel 1bc through the gap and accumulates, causing damage to the exterior. Corrosion of the material 10 and deterioration of the sound absorbing material 2 may be caused. For example, by contacting the top surface part 14 and the sound absorbing material 2 so as not to provide a gap between the top surface part 14 and the sound absorbing material 2, it is possible to suppress water accumulation in the gap and prevent rain water from stagnating. etc. can be prevented from entering the inside of the sound absorbing panel 1bc. Even in this way, the sound absorbing performance can be maintained.

<Second Embodiment: Fourth Example>
Like the sound absorbing panel 1bd according to the fourth example shown in FIG. 8(e), the second example and the third example are combined, and at least the upper surface is covered with a water-repellent member 21 having air permeability. may be in contact with the top surface portion 14 . According to the sound absorbing panel 1bd according to the fourth example, since the sound absorbing material 2 whose upper surface is at least covered with the air-permeable water-repellent member 21 and the top surface portion 14 are in contact with each other, it is possible to suppress water accumulation in the gap. Moreover, since the surface of the sound absorbing material 2 is water repellent, the sound absorbing performance can be maintained even better.

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

As shown in FIG. 9, a sound absorbing panel 1c according to an example of the third embodiment is an example in which substantially the entire surface of a sound absorbing material 2 is covered with a water-repellent member 21 having air permeability.

By covering substantially the entire surface of the sound absorbing material 2 with the water-repellent member 21 as in the sound absorbing panel 1c, the sound absorbing material can pass through the first opening 16a of the front plate 11 and the second opening 16b of the rear plate 12. 2 can be prevented from permeating rainwater or the like, and the sound absorbing performance can be maintained.

In the sound absorbing panel 1c, substantially the entire surface of the sound absorbing material 2 is covered with the water-repellent member. The surface positioned at the portion 16a or the second opening portion 16b may be covered with a water-repellent member having air permeability. Even in this way, it is possible to prevent rainwater or the like from penetrating into the sound absorbing material 2 and maintain the sound absorbing performance.

(Fourth embodiment)
FIG. 10 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the fourth embodiment of the invention. The schematic cross section shown in FIG. 10 corresponds to the schematic cross section shown in FIG. 2 (second embodiment: first example).

As shown in FIG. 10, a sound absorbing panel 1d according to an example of the fourth embodiment is an example in which a vertical partition member 22 provided substantially in the vertical direction Z is further provided in the exterior member 10. As shown in FIG. The vertical partition member 22 may be a plate member made of metal, a sheet member made of rubber or lead, or a member made of high-density cloth (for example, a soundproof curtain, a soundproof curtain), or the like. In this embodiment, a case in which a plate-like member made of metal is used will be described.

In the first to third embodiments, the back plate 12 includes both the second sound transmitting surface 17b and the sound insulating surface 18, thereby enhancing sound insulation. However, since the second opening 16b is provided in the upper portion of the back plate 12, there is a possibility that the sound insulation performance of the second sound transmitting surface 17b will deteriorate.

If such circumstances are of concern, for example, vertical partitions 22 may be provided in the exterior material 10 . According to the sound absorbing panel 1d further provided with the vertical partition 22, compared to the case without the vertical partition 22, the sound transmitted through the second sound transmission surface 17b can be further reduced, and the sound insulation is further improved. can be made

Further, in order to further improve sound insulation, the vertical partition member 22 provided in the exterior material 10 may be overlapped with the sound insulation surface 18 as indicated by the arrow in FIG. As a result, when the rear plate 12 is projected from the position of the sound source, the vertical partition member 22 can hide the second sound transmission surface 17b. As a result, the sound that is about to pass through the second sound transmission surface 17b can be blocked, and the sound can be efficiently reduced.

(Fifth embodiment)
FIG. 11 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the fifth embodiment of the invention. The schematic cross section shown in FIG. 11 corresponds to the schematic cross section shown in FIG. 2 (second embodiment: first example).

As shown in FIG. 11, a sound absorbing panel 1e according to an example of the fifth embodiment is an example in which a horizontal partition member 23 provided substantially in the second plane direction Y is further provided in the exterior member 10. As shown in FIG. Such a horizontal partition member 23 can also block sound that is about to be transmitted through the second sound transmission surface 17b, and can reduce noise caused by sound that is transmitted through the second sound transmission surface 17b. The horizontal partition member 23 may be a plate member made of metal, a sheet member made of rubber or lead, or a member made of high-density cloth (for example, a soundproof curtain, a soundproof curtain), or the like. In this embodiment, a case in which a plate-like member made of metal is used will be described.

In addition, when the horizontal partition member 23 is further provided in the exterior material 10, the horizontal partition member 23 serves as a boundary for the sound absorbing panel 1e. 15 side) 23b. This makes it possible, for example, to change the density of the sound absorbing material 2 between the upper portion 23a and the lower portion 23b.

For example, let "ρa" be the density of the sound absorbing material 2a provided in the upper portion 23a. Also, let "ρb" be the density of the sound absorbing material 2b provided in the lower portion 23b. When the density of the sound absorbing material is high, the sound absorbing effect tends to increase. According to this tendency, the density ρa of the sound absorbing material 2a is made larger than the density ρb of the sound absorbing material 2b. As a result, compared to the case where the density of both the upper portion 23a and the lower portion 23b of the sound absorbing material 2 is set to "ρb", the sound absorption effect of the diffracted sound DS diffracted near the upper edge of the sound absorbing panel 1e can be improved. can be enhanced.

(Sixth embodiment)
FIG. 12 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the sixth embodiment of the invention. The schematic cross section shown in FIG. 12 corresponds to the schematic cross section shown in FIG. 2 (second embodiment: first example).

As shown in FIG. 12, the sound absorbing panel 1f according to an example of the sixth embodiment differs from the sound absorbing panel 1e in that the thickness T1 of the sound absorbing material 2a along the second plane direction Y is greater than the thickness T1 of the sound absorbing material 2b. It is larger than the thickness T2 along the two-plane direction Y.

The sound absorbing effect of the diffracted sound DS diffracted in the vicinity of the upper edge of the sound absorbing panel 1f increases, for example, as the thickness of the sound absorbing material 2a present along the top surface portion 14 increases. Following this trend, the thickness T1 is made thicker than the thickness T2. As a result, compared to the case where the thickness T1 is substantially equal to the thickness T2, the sound absorbing portion is longer, and the effect of absorbing the diffracted sound DS can be further enhanced.

In addition, in the sound absorbing panel 1f, the thickness of the upper portion (top surface portion 14 side) of the sound absorbing panel 1f is thicker than the thickness of the lower portion (bottom portion 15 side), so the sound absorbing material 2a is provided on the upper portion of the sound absorbing panel 1f. The arranged projecting portion 24 is newly provided. When the projecting portion 24 is provided, it is preferable that the projecting portion 24 protrudes toward the rear surface side toward the rear plate 12 . As a result, the projecting portion 24 does not protrude toward the road surface, and for example, contact between the sound absorbing panel 1f and the vehicle and hindrance to the running of the vehicle are eliminated.

With such a sound absorbing panel 1f, the sound absorbing effect of the diffracted sound DS is improved, and when installed on the topmost stage of the sound insulating wall 100, it is possible to obtain the sound insulating wall 100 that maintains safety. can.

(Seventh embodiment)
FIG. 13 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the seventh embodiment of this invention. The schematic cross section shown in FIG. 13 corresponds to the schematic cross section shown in FIG. 2 (second embodiment: first example).

As shown in FIG. 13, a sound absorbing panel 1g according to an example of the seventh embodiment is different from the sound absorbing panel 1e in that a vertical partition member 22 and a horizontal partition member 23 are used to form the projecting portion 24 into a sound absorbing panel. This is an example provided on the upper part of the panel 1g (on the top surface part 14 side).

The vertical partitions 22 and the horizontal partitions 23 form, for example, an L shape in the ZY cross section, and the second sound transmission surface 17b of the projecting portion 24 overlaps with the vertical partitions 22 and the horizontal partitions 23 on the sound source side. blocked by As a result, it is possible to substantially block transmitted sound that is about to be transmitted through the second sound transmission surface 17b while improving the sound absorbing effect of the diffracted sound DS.

Also, in the sound absorbing panel 1g, the relationship between the thickness T1 and the thickness T2 may not be "T1>T2". However, in the sound absorbing panel 1g, there is a relationship that the thickness T3 along the second planar direction Y of the top surface portion 14 is greater than the thickness T4 along the second planar direction Y of the bottom surface portion 15 . In addition, as with the sound absorbing panel 1f, the projecting portion 24 is projected toward the rear side toward the rear plate 12, so that the sound absorbing panel 1g is also installed at the top of the soundproof wall 100. When this is done, it is possible to obtain the advantage that the sound barrier 100 that maintains safety can be obtained.

(Eighth embodiment)
FIG. 14 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the eighth embodiment of the invention. The schematic cross section shown in FIG. 14 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 14, a sound absorbing panel 1h according to an example of the eighth embodiment differs from the sound absorbing panel 1 in that there is an air layer 25 between the sound absorbing material 2 and the back panel 12. FIG.

According to the sound absorbing panel 1h, by providing the air layer 25 behind the sound absorbing material 2 when viewed from the sound source side, it is possible to absorb sound in a wide frequency range from high to low frequencies.

The eighth embodiment can be combined with the second to fourth embodiments in addition to the first embodiment.

(Ninth embodiment)
FIG. 15 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the ninth embodiment of the invention. The schematic cross section shown in FIG. 15 corresponds to the schematic cross section shown in FIG. 2 (second embodiment: first example).

As shown in FIG. 15, a sound absorbing panel 1i according to an example of the ninth embodiment differs from the sound absorbing panel 1e in that there is an air layer 25 between the sound absorbing material 2b and the back plate 12. FIG.

When the sound absorbing panel 1i is provided with the horizontal partition member 23, the air layer 25 may be provided only in the lower portion 23b, for example.

Also in the ninth embodiment, since the air layer 25 is provided behind the sound absorbing material 2 when viewed from the sound source side, it is possible to absorb sound in a wide frequency range from high to low frequencies.

The ninth embodiment can be combined with the fifth embodiment, the sixth embodiment, and the seventh embodiment.

(Tenth embodiment)
FIG. 16 is a schematic cross-sectional view showing an example of a sound absorbing panel according to the tenth embodiment of the invention. The schematic cross section shown in FIG. 16 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 16, a sound absorbing panel 1j according to an example of the tenth embodiment differs from the sound absorbing panel 1 in that the first opening 16a has a louver shape.

Since the sound absorbing panel 1j is arranged on the uppermost level of the soundproof wall 100, noise from a vehicle or the like is emitted from below the sound absorbing panel 1j when viewed from the front. By forming the first opening 16a into a louver shape, it is possible to efficiently take in sound emitted from below the front surface of the sound absorbing panel 1j through the first opening 16a, thereby improving sound absorption.

In addition, the louver shape has an eave-like portion above the first opening 16a, so there is an advantage that rainwater or the like is less likely to enter the interior of the exterior material 10. FIG.

The tenth embodiment can be combined with any of the second to ninth embodiments in addition to the first embodiment.

(Eleventh embodiment)
FIG. 17(a) is a schematic rear view showing an example of a sound absorbing panel according to the eleventh embodiment of the present invention. FIG. 17(b) is a schematic cross-sectional view along line XVIIB--XVIIB in FIG. 17(a).

As shown in FIGS. 17(a) and 17(b), a sound absorbing panel 1k according to an example of the eleventh embodiment differs from the sound absorbing panel 1 in that the second opening 16b has a single slit structure. There is something.

The diffracted sound DS trying to diffract in the vicinity of the upper edge of the sound absorbing panel 1k installed on the uppermost stage can be regarded as a state in which there are two sound sources: the front-side upper edge corner 19a and the rear-side upper edge corner 19b. can. For this reason, the second opening 16b, which is locally provided only in the upper part of the back plate 12 (on the side of the top surface 14), has a single slit structure, thereby maximizing the opening ratio of the second sound transmission surface 17b. can be secured. Thereby, sound absorption can be improved more.

The eleventh embodiment can be combined with any of the second to tenth embodiments in addition to the first embodiment.

As described above, according to the embodiments of the present invention, the sound reduction effect can be obtained on the sides and below the sound source and on the extension line from the sound source to the sound absorbing panel. Acoustic panels can be provided.

Although some 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, although the intermediate sound absorbing panel 3 is illustrated in FIGS. 3 and 4, other panels such as translucent plates and concrete plates may be used as the panel. In addition, these embodiments can be implemented in combination as appropriate. Furthermore, the present invention can be implemented in various novel forms other than the above several embodiments. Therefore, various omissions, replacements, and modifications are possible for each of the above several embodiments without departing from the scope of the present invention. Such novel forms and modifications are included in the scope and gist of the present invention, as well as the invention described in the claims and the scope of equivalents of the invention described in the claims.

1: Sound absorbing panel (first embodiment)
1ba to 1bd: sound absorbing panel (second embodiment: first to fourth examples)
1c: Sound absorbing panel (third embodiment)
1d: Sound absorbing panel (fourth embodiment)
1e: sound absorbing panel (fifth embodiment)
1f: Sound absorbing panel (sixth embodiment)
1g: sound absorbing panel (seventh embodiment)
1h: Sound absorbing panel (eighth embodiment)
1i: Sound absorbing panel (ninth embodiment)
1j: Sound absorbing panel (tenth embodiment)
1k: Sound absorbing panel (11th embodiment)
10: Exterior material 11: Front plate (front part)
12: Back plate (back part)
14: top surface 15: bottom surface 16a: first opening 16b: second opening 16c: third opening 17a: first sound transmission surface 17b: second sound transmission surface 18: sound insulation surface 19a: front upper edge Corner 19b: Rear side upper edge corner 1r: Sound absorbing panel (reference example)
11r: front plate 12r: rear plate 2: sound absorbing material 2a: sound absorbing material 2b: sound absorbing material 21: water repellent member 22: vertical partition member 23: horizontal partition member 23a: upper portion 23b: lower portion 24: projecting portion 25: Air layer 3: Intermediate sound absorbing panel 31: Front plate (front part)
32: Back plate (back part)
36: Fourth opening 4: Post 100: Soundproof wall (first embodiment)
100r: Soundproof wall (reference example)
150: Wall balustrade 200: Viaduct 201: Viaduct wall balustrade 300: Building 350: Building W1: Width W2 along the second direction X of the first sound transmission surface 17a: In the second direction X of the second sound transmission surface 17b Width L1 along: length L2 along the vertical direction Z of the first sound transmission surface 17a: length T1 along the vertical direction Z of the second sound transmission surface 17b: along the second planar direction Y of the sound absorbing material 2a Thickness T2: Thickness T3 along the second plane direction Y of the sound absorbing material 2b: Thickness T4 along the second plane direction Y of the top surface portion 14: Thickness T4 along the second plane direction Y of the bottom surface portion 15 Sa DS: Diffracted sound TS: Transmitted sound SS: Sound source I: Extension line

Claims (14)

A sound absorbing panel installed at the top of a soundproof wall,
an exterior material having a front portion facing the sound source side and a back portion facing the sound receiving side;
and a sound absorbing material embedded in the exterior material,
A first opening is provided in the entire front portion of the front portion,
A second opening is provided only in the upper part of the back part, and a sound insulation surface is provided for reflecting transmitted sound on a straight line connecting a sound source and a sound receiving point. sound absorbing panel. The exterior material has a top surface,
The sound absorbing panel according to claim 1, wherein the top surface portion is provided with a third opening. 2. The sound absorbing panel according to claim 1, wherein at least the surface of the sound absorbing material located at the first opening or the second opening is covered with a water-repellent member having air permeability. 3. The sound absorbing panel according to claim 1, wherein at least an upper surface of the sound absorbing material is covered with a water-repellent member having air permeability. The sound absorbing panel according to claim 2, wherein the sound absorbing material is in contact with the top surface portion. The sound absorbing panel according to any one of claims 1 to 5, further comprising a vertical partition provided in the exterior material. 3. The sound absorbing panel according to claim 2 , wherein a vertical partition member extending downward from the top surface portion is provided so as to overlap a rear surface portion of a lower portion of the second opening. The sound absorbing panel according to any one of claims 1 to 7, wherein the exterior material includes horizontal partitions provided in a plane direction. The sound absorbing material is arranged above and below the horizontal partition,
The sound absorbing material arranged above has at least one of a density of the sound absorbing material and a thickness of the sound absorbing material in a plane direction of the sound absorbing panel greater than that of the sound absorbing material arranged below. 9. The sound absorbing panel according to 8. The upper part of the sound absorbing panel is provided with an overhang part that protrudes from the lower part toward the back part,
The sound absorbing panel according to any one of claims 1 to 9, wherein the sound absorbing material is further arranged on the projecting portion. 11. The sound absorbing material arranged in the projecting portion has at least one of a density and a thickness in the plane direction of the sound absorbing panel larger than that of the sound absorbing material arranged on the front side or below. Acoustic panel as described. The sound absorbing panel according to any one of claims 1 to 11, wherein there is an air layer between the sound absorbing material and the back portion . The sound absorbing panel according to any one of claims 1 to 12, wherein the first opening has a louver shape. The sound absorbing panel according to any one of claims 1 to 13, wherein the second opening has a single slit structure.

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