JP2020176448A - Sound absorption panel - Google Patents

Abstract

To provide a low cost sound absorption panel in which a sound reducing effect can be obtained on a side and a lower side of a sound source and on an extension line from the sound source to the sound absorption panel, and which eliminates any problems in scenery.SOLUTION: A sound absorption panel 1 installed on the top of a sound proof wall includes: an exterior material 10 having a front face part facing a sound source side, a back face part facing a sound receiving side, and a top face part provided between the front face part and the back face part; and a sound absorption material packed inside the exterior material 10. A front plate 11 is provided with first openings 16a over the entire front face part. The top face part 14 is provided with second openings 16b. The back face part 12 is a continuous surface from an upper end part to a lower end part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sound absorbing panel.

The sound absorbing panel installed on the uppermost stage of the soundproof wall attenuates not only the reflected sound between the walls but also the sound (diffracted sound) wrapping around from the upper side of the soundproof wall among the sounds emitted from the sound source side. As a result, the noise on the back side of the soundproof wall on the sound receiving side can be reduced. Patent Documents 1 to 5 are known as examples of sound absorbing panels.

Japanese Unexamined Patent Publication No. 2014-101747 International Publication No. 2015/11949 JP-A-2017-227680 Japanese Unexamined Patent Publication No. 2016-21344 Japanese Unexamined Patent Publication No. 2003-147731

The sound absorbing panels described in Patent Documents 1 to 5 are all installed on the uppermost stage of the soundproof wall. In the sound absorbing panels described in Patent Documents 1 to 5, sound transmitting surfaces provided with a large number of sound insertion holes are 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 5 all utilize "edge effect suppression technology", and diffracted diffracted sound 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 is aimed at improving.

However, in each of the sound absorbing panels described in Patent Documents 1 to 4, the entire back surface is a sound transmitting surface, and even if the diffracted sound can be reduced, the sound (transmitted sound) transmitted through the sound absorbing panel can be produced. It cannot be reduced. Therefore, if there is a sound receiving point on the extension line connecting the sound source and the sound absorbing panel installed on the uppermost stage of the soundproof wall, there is a circumstance that the noise cannot be reduced at this sound receiving point.

On the other hand, in the sound absorbing panel described in Patent Document 5, sound insulating plates are installed behind the sound absorbing material on the front surface portion, the back surface portion, and the top surface portion. As a result, even if the sound receiving point is on the extension line connecting the sound source and the sound absorbing panel installed on the uppermost stage of the soundproof wall, the noise at the sound receiving point can be reduced. However, since the panel has a structure that greatly overhangs to the back side, it is not preferable in terms of scenery, and the manufacturing cost is extremely high.

The present invention has been made in view of the above circumstances, and an object thereof is to provide sound receiving points on the sides and below of the sound source, and on the extension line of the sound absorbing panel installed at the uppermost stage of the sound source to the soundproof wall. On the other hand, it is an object of the present invention to provide a low-cost sound absorbing panel which can obtain a sound reducing effect and has no problem in landscape.

The sound absorbing panels of Patent Documents 1 to 5 aim to improve the sound reduction effect by providing a sound insertion hole near the upper part of the panel to absorb the diffracted sound, and all the techniques are the front surface of the exterior material. Openings are provided on both the portion and the back portion. This is based on the idea that the sound reduction effect is improved by the "edge effect suppression technology" due to the opening on the back surface. However, on the other hand, when there is no opening on the back portion, the apparent height of the soundproof wall is higher by the height of this back portion than when there is an opening on the back portion, and the side of the sound source and the side of the sound source and The sound reduction effect is improved by the "distance attenuation effect" obtained by increasing the distance to the sound receiving point located below. Based on the two effects that the sound reduction effect is improved by the "edge effect suppression technology" and the "distance attenuation effect", the present inventors are important in considering the sound reduction of the diffracted sound. I focused on the point. Then, as a result of various studies on this balance, it was newly found that the diffracted sound can be reduced most effectively when there are openings only in the front portion and the top surface portion. That is, if there is an opening on the top surface, a certain amount of "edge effect suppression technology" can be obtained even if there is no opening on the back plate, and at the same time, a "distance attenuation effect" due to the back plate without an opening can be obtained. In addition, it was clarified that this state is the most desirable in terms of sound reduction effect.

The sound absorbing panel according to the first invention is a sound absorbing panel installed on the uppermost stage of the soundproof wall, and includes a front portion facing the sound source side, a back portion facing the sound receiving side, and the front portion and the back portion. An exterior material having a top surface portion provided between the two, and a sound absorbing material incorporated in the exterior material are provided, and a first opening is provided in the entire front surface portion of the front surface portion. A second opening is provided in the face portion, and the back surface portion is characterized in that the upper end portion to the lower end portion is a continuous surface.

The sound absorbing panel according to the second invention is characterized in that, in the first invention, a second opening is provided in the entire top surface portion of the top surface portion.

The sound absorbing panel according to the third invention is characterized in that, in the first invention or the second invention, at least the surface of the sound absorbing material located at the second opening is covered with a water-repellent member having breathability. To do.

The sound absorbing panel according to the fourth invention is characterized in that, in any one of the first to third inventions, the sound absorbing material is in contact with the top surface portion.

In any one of the first to fourth inventions, the sound absorbing panel according to the fifth invention is provided with an overhanging portion protruding from the lower portion toward the back surface portion at the upper portion of the sound absorbing panel. It is characterized in that it is further arranged in the overhanging portion.

The sound absorbing panel according to the sixth invention is characterized in that, in the fifth invention, the sound absorbing material arranged in the overhanging portion has a higher density than the sound absorbing material arranged on the front side.

The sound absorbing panel according to the seventh invention is characterized in that, in any one of the first invention, the third invention to the sixth invention, there is an air layer between the sound absorbing material and the back surface portion.

The sound absorbing panel according to the eighth invention is characterized in that, in any one of the first to seventh inventions, the first opening has a louver shape.

According to the first to eighth inventions, a sound reduction effect can be obtained for each sound receiving point on the side and the lower side of the sound source and on the extension line of the sound absorbing panel installed at the uppermost stage of the sound source to the soundproof wall. Furthermore, it is possible to provide a low-cost sound absorbing panel without any landscape problems.

FIG. 1A is a schematic front view showing an example of a sound absorbing panel according to the first embodiment of the present invention. FIG. 1B is a schematic plan view showing an example of a sound absorbing panel according to the first embodiment of the present invention. FIG. 1C is a schematic rear 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 the line II-II in FIGS. 1 (a) to 1 (c). FIG. 3 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. FIG. 4 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. FIG. 5A is a schematic front view showing an example of a sound absorbing panel according to the first embodiment of the present invention. FIG. 5B is a schematic plan view showing an example of a sound absorbing panel according to the first embodiment of the present invention. FIG. 5C is a schematic rear view showing an example of the sound absorbing panel according to the first embodiment of the present invention. FIG. 6 is a schematic view showing a state of sound insulation by a soundproof wall provided with a sound absorbing panel according to a reference example. FIG. 7 is a schematic view showing a state of sound insulation by a soundproof wall provided with a 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 (d) 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 a third embodiment of the present invention. 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. 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. 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. FIG. 13 is a schematic cross-sectional view showing an example of a sound absorbing panel according to a seventh embodiment of the present invention. FIG. 14 is a schematic cross-sectional view showing an example of a sound absorbing panel according to an eighth embodiment of the present invention. FIG. 15 is a schematic cross-sectional view showing an example of a sound absorbing panel according to a ninth embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described 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 orthogonal plane direction is defined as the first plane direction X and intersects each of the vertical direction Z and the first plane direction X, for example. Another plane direction orthogonal to each other is defined as the second plane direction Y. Further, in each figure, common reference numerals are given to common parts, and duplicate description is omitted.

(First Embodiment)
FIG. 1A is a schematic front view showing an example of a sound absorbing panel according to the first embodiment of the present invention. FIG. 1B is a schematic plan view showing an example of a sound absorbing panel according to the first embodiment of the present invention. FIG. 1C is a schematic rear 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 the line II-II in FIGS. 1 (a) to 1 (c).

As shown in FIGS. 1A and 2, the sound absorbing panel 1 according to the first embodiment includes an exterior material 10 and a sound absorbing material 2. The exterior material 10 has, for example, a front plate (front portion) 11 and a back plate (back portion) 12. The front plate 11 is directed toward the sound source. The back plate 12 is directed to the sound receiving side. The front plate 11 and the back plate 12 are separated from each other in the second plane direction Y and face each other. At least one upper portion of the front plate 11 and the back plate 12 is bent into an L shape, for example, and constitutes the top surface portion 14. The top surface portion 14 is provided between the front surface plate 11 and the back surface plate 12 so as to connect the upper end portion of the front plate 11 and the upper end portion of the back plate 12. A top plate may be separately provided as the top surface portion 14. At least one lower portion of the front plate 11 and the back plate 12 is bent into an L shape, for example, and constitutes a bottom surface portion 15. A bottom plate may be separately provided as the bottom surface portion 15. Further, the bottom surface 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 galvanized steel sheet.

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

The front plate 11 is provided with a plurality of first openings 16a for transmitting sound. These first openings 16a are provided on the entire front plate 11. It should be noted that the term "whole" as used herein refers not only to the complete whole, but also to the substantial or de facto whole (substantially the whole) as shown in FIG. 1 (a). It shall be. The back plate 12 is a continuous surface from the upper end to the lower end. That is, the back plate 12 is not provided with an opening. The top surface portion 14 is provided with a plurality of second openings 16b for transmitting sound. These second openings 16b are provided on the entire top surface portion 14. The second opening 16b may be locally provided on the top surface portion 14 (for example, the front plate 11 side of the top surface portion 14 or the back plate 12 side of the top surface portion 14). The shape of each of the second openings 16b in a plan view is, for example, a circle.

FIG. 3 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. FIG. 4 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.

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

The intermediate sound absorbing panel 3 includes an exterior material and a sound absorbing material, similarly to the sound absorbing panel 1. Similar to 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 back plate (back portion) 32. The front plate 31 is directed toward the sound source. The back plate 32 is directed to the sound receiving side. The sound absorbing material (not shown) is installed in the exterior material. The front plate 31 is provided with a plurality of third openings 36 for transmitting sound. These third openings 36 are provided on the front plate 31 as a whole. The third opening 36 has, for example, a louver shape. In contrast to such a front plate 31, the back plate 32 is not provided with an opening for transmitting sound.

FIG. 5A is a schematic front view showing an example of a sound absorbing panel according to the first embodiment of the present invention. FIG. 5B is a schematic plan view showing an example of a sound absorbing panel according to the first embodiment of the present invention. FIG. 5C is a schematic rear view showing an example of the sound absorbing panel according to the first embodiment of the present invention.

As shown in FIGS. 5A and 5B, the region of the front plate 11 provided with the first opening 16a is assumed to be the first sound transmitting surface 17a. Further, it is assumed that the region of the top surface portion 14 provided with the second opening 16b is the second sound transmitting surface 17b. The first sound transmitting surface 17a is set on the entire front plate 11. The width W2 of the second sound transmitting surface 17b along the first plane direction X is substantially equal to the width W1 of the first sound transmitting surface 17a along the first plane direction X (W2≈W1).

On the other hand, as shown in FIG. 5C, the back plate 12 has a continuous surface from the upper end to the lower end, and it is possible to obtain a non-opening region having no opening as a whole. The non-opening region is the sound insulation surface 18. As a result, the back plate 12 of the sound absorbing panel 1 can be provided with the sound insulating surface 18 as a whole. The sound insulating surface 18 faces the first sound transmitting surface 17a via the sound absorbing material 2.

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

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

As shown in FIG. 6, in the sound absorbing panel 1r according to the reference example, openings for transmitting sound are provided in the entire front plate 11r and the back plate 12r, respectively. In the soundproof wall 100r provided with such a sound absorbing panel 1r, the diffracted sound DS1 diffracted near the upper edge of the sound absorbing panel 1r is absorbed through the opening, so that the diffracted sound DS1 can be attenuated. As a result, the sound diffracted sound by the sound absorbing panel 1r is directed to the sound receiving point A on the side and below the soundproof wall 100r, for example, the residents and users of the building 300 on the side and below the soundproof wall 100r. A sound reduction effect for DS1 can be obtained.

That is, in the case of reducing the diffracted sound DS1 that tries to diffract the vicinity of the upper edge of the sound absorbing panel 1r installed at the uppermost stage, the "edge effect suppressing technique" is used. With this technology, when the sound gets over a thick wall, it becomes a concentric wave surface centered on the front side upper edge corner 19a and the back side upper edge corner 19b, and it is as if the sound source is in the center of the concentric circle. Therefore, it is possible to effectively absorb sound by arranging a function capable of absorbing sound in the vicinity of this area.

However, the transmitted sound TS is generated on the extension line I of the sound absorbing panel 1r installed at the uppermost stage of the sound source SS to the soundproof wall 100r. Therefore, 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 condominiums, buildings, etc. On the other hand, it is difficult to expect a sound reduction effect on the transmitted sound TS.

Further, the sound generated from the sound source SS is diffracted in the vicinity of the lower edge of the sound absorbing panel 1r (front side lower edge corner portion 19c and back side lower edge corner portion 19d), and diffracted sound DS2 is generated. Since this diffracted sound DS2 is diffracted near the lower edge of the sound absorbing panel 1r, the distance to the sound receiving point A is shorter than the sound diffracted near the upper edge of the sound absorbing panel 1r, and the distance is reduced due to the distance attenuation. The sound effect is low. Therefore, for the sound receiving point A on the side and below the soundproof wall 100r, for example, the residents and users of the building 300 on the side and below the soundproof wall 100r, the diffracted sound by the sound absorbing panel 1r. It is difficult to expect a sound reduction effect on the DS2.

With respect to such a reference example, according to the soundproof wall 100 provided with the sound absorbing panel 1 according to the first embodiment, as shown in FIG. 7, the back plate 12 of the sound absorbing panel 1 is provided with the sound insulating surface 18 as a whole. ing. Therefore, the transmitted sound TS that is going to pass through the extension line I of the sound source SS to the sound absorbing panel 1 can be reflected on the sound insulating surface 18. As a result, residents of the sound receiving point B on the extension line I, for example, the building 350 on the extension line I of the sound absorbing panel 1 installed at the uppermost stage of the sound source SS to the soundproof wall 100, for example, an apartment or a building. And the sound reduction effect by the sound absorbing panel 1 can be obtained for the user and the like.

Further, the top surface portion 14 has a second sound transmitting surface 17b. Therefore, the diffracted sound that attempts to diffract the vicinity of the upper edge of the sound absorbing panel 1 installed at the uppermost stage is regarded as having sound sources at two locations, the front side upper edge corner portion 19a and the back side upper edge corner portion 19b. be able to. As a result, the sound absorbing panel 1 also has a sound reducing effect on the sound receiving points A on the side and below the soundproof wall 100, for example, the residents and users of the building 300 on the side and below the soundproof wall 100. Is obtained.

Further, the back plate 12 is a continuous surface from the upper end portion to the lower end portion, and is a sound insulation surface 18 as a whole. Therefore, the diffracted sound diffracted in the vicinity of the lower edge of the sound absorbing panel 1 (front side lower edge corner portion 19c and back side lower edge corner portion 19d) is not generated, and the diffracted sound by the sound absorbing panel 1 is generated by the sound absorbing panel 1. Only the diffracted sound DS1 diffracted near the upper edge. That is, in the sound absorbing panel 1, the apparent height of the soundproof wall 100 can be increased by the height of the back surface portion 12 as compared with the case where the back surface portion has an opening. As a result, the distance to the sound receiving point A becomes long, and the sound reduction effect due to the distance attenuation can be enhanced. Therefore, the sound reduction effect of the sound absorbing panel 1 is also applied to the sound receiving points A on the side and below the soundproof wall 100, for example, the residents and users of the building 300 on the side and below the soundproof wall 100. can get.

As described above, the sound absorbing panel 1 has the first sound transmitting surface 17a and the second sound transmitting surface 17b on the front surface portion and the top surface portion, respectively, so that the diffracted sound DS1 affecting the inhabitants under the viaduct 200 can be obtained. Can absorb sound. Further, since the entire back surface portion 12 of the sound absorbing panel 1 is the sound insulating surface 18, the apparent height of the soundproof wall 100 is increased by the height of the back surface portion 12 as compared with the case where the back surface portion has an opening. Can be high. Therefore, the distance to the sound receiving point A becomes long, and the sound reduction effect due to the distance attenuation can be enhanced. Therefore, by having the first opening 16a and the second opening 16b only on the front surface portion 11 and the top surface portion 14, the diffracted sound can be reduced most effectively, and the receivers on the sides and below the soundproof wall 100 can be reduced. The sound absorbing panel 1 can obtain a sound reducing effect for the sound point A, for example, the residents and users of the building 300 located on the side and below the soundproof wall 100. In addition, since the back plate 12 has a sound insulation surface 18 as a whole, since this portion also has the function of a sound insulation plate, it is possible to reduce the sound of the transmitted sound TS that affects the residents located above the road surface of the viaduct 200. ..

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

Further, according to the first embodiment, since the panel does not have a structure that greatly projects to the back side, there is no problem in landscape and the cost can be reduced.

Further, according to the first embodiment, the soundproof wall 100 provided with such a sound absorbing panel 1 and the soundproof wall 100 having the sound absorbing panel 1 at the uppermost stage and the intermediate sound absorbing panels 3 arranged in at least one stage in the vertical direction Z. Can be obtained.

The sound absorbing panel 1 and the soundproof wall 100 provided with the sound absorbing panel 1 can be effectively used, for example, on roads, bridges, etc. on which automobiles and the like travel, and further, noise is generated in urban areas, plain areas, and mountains. It can be reduced in various places such as a part and a digging part. Of course, the sound absorbing panel 1 and the sound barrier 100 provided with the sound absorbing panel 1 are not limited to roads on which automobiles and the like travel, but also on various railway tracks on which track-type, cableway-type, and levitation-type railways run, and to neighboring residents. It can also be applied to noise sources such as factories, schools, and nurseries that require careful noise control.

(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 (d) 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 (d) correspond to the enlarged view of the broken line frame VIII in FIG.

<Second Embodiment: First Example>
As shown in FIG. 8A, the sound absorbing panel 1 according to the first embodiment is provided with a second opening 16b on the top surface portion 14.

As in the sound absorbing panel 1ba according to the first example shown in FIG. 8B, at least the upper surface of the sound absorbing material 2 may be covered with a water repellent member 21 having breathability. When the opening 16b is provided on the top surface 14, rainwater or the like may permeate into the sound absorbing material 2 from the second opening 16b, and the sound absorbing performance may be deteriorated. By covering at least the upper surface of the sound absorbing material 2 with a water-repellent member 21 having breathability, it is possible to prevent rainwater or the like from penetrating into the sound absorbing material 2 and maintain the sound absorbing performance.

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

<Second Embodiment: Second Example>
The sound absorbing material 2 may be in contact with the top surface portion 14 as in the sound absorbing panel 1bb according to the second example shown in FIG. 8 (c). When the second opening 16b is provided on the top surface portion 14, 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 1bb through the gap, and the water stays on the exterior. There is a possibility of causing corrosion of the material 10 and deterioration of the sound absorbing material 2. For example, by contacting the top surface portion 14 and the sound absorbing material 2 so as not to provide a gap between the top surface portion 14 and the sound absorbing material 2, it is possible to suppress the intrusion of rainwater or the like into the gap, and the sound absorbing panel. It is possible to prevent the inside of 1bb from entering.

<Second Embodiment: Third Example>
A sound absorbing material 2 in which the first example and the second example are combined and at least the upper surface is covered with a water repellent member 21 having breathability, as in the sound absorbing panel 1bc according to the third example shown in FIG. 8 (d). May be in contact with the top surface portion 14. According to the sound absorbing panel 1bc according to the third example, since the sound absorbing material 2 whose upper surface is covered with the breathable water repellent member 21 and the top surface portion 14 are in contact with each other, rainwater or the like can enter the gap. Since it can be suppressed and 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 a third embodiment of the present invention. The schematic cross section shown in FIG. 9 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 9, the sound absorbing panel 1c according to an example of the third embodiment is an example in which substantially all the surfaces of the sound absorbing material 2 are covered with a water repellent member 21 having breathability.

By covering almost the entire surface of the sound absorbing material 2 with the water repellent member 21 like the sound absorbing panel 1c, the sound absorbing material is formed from the first opening 16a of the front plate 11 and the second opening 16b of the top surface portion 14. Permeation of rainwater or the like into 2 can be prevented, and sound absorption performance can be maintained.

Further, in the sound absorbing panel 1c, substantially all the surfaces of the sound absorbing material 2 are covered with the water repellent member, but the surface of the sound absorbing material 2 located at least in the first opening 16a or the second opening 16b is ventilated. It may be covered with a water-repellent member having a property. Even in this way, it is possible to prevent rainwater or the like from penetrating into the sound absorbing material 2, and it is possible to 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 a fourth embodiment of the present invention. The schematic cross section shown in FIG. 10 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 10, the sound absorbing panel 1d according to an example of the fourth embodiment is an example in which the exterior material 10 is further provided with a horizontal partition member 23 provided in the substantially second plane direction Y. As the horizontal partition member 23, a metal plate-shaped member, a rubber or lead sheet-shaped member, a high-density cloth member (for example, a soundproof curtain, a soundproof curtain), or the like can be used. In this embodiment, the case where a metal plate-shaped member is used will be described.

Further, when the horizontal partition member 23 is further provided in the exterior material 10, the sound absorbing panel 1d has an upper portion (top surface portion 14 side) 23a and a lower portion (bottom surface portion 14 side) with the horizontal partition member 23 as a boundary. Part 15 side) It is divided into two parts with 23b. As a result, for example, the densities of the sound absorbing material 2 can be changed between the upper portion 23a and the lower portion 23b.

For example, the density of the sound absorbing material 2a provided in the upper portion 23a is set to "ρa". Further, the density of the sound absorbing material 2b provided in the lower portion 23b is defined as "ρb". 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, the sound absorbing effect of the diffracted sound DS1 diffracted near the upper edge of the sound absorbing panel 1d is further enhanced as compared with the case where the densities of both the upper portion 23a and the lower portion 23b of the sound absorbing material 2 are set to “ρb”. Can be enhanced.

(Fifth Embodiment)
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. The schematic cross section shown in FIG. 11 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 11, the sound absorbing panel 1e according to the example of the fifth embodiment is different from the sound absorbing panel 1d in that the thickness T1 of the sound absorbing material 2a along the second plane direction Y is the first of the sound absorbing material 2b. It is larger than the thickness T2 along the two plane directions Y.

The sound absorbing effect of the diffracted sound DS1 diffracted near the upper edge of the sound absorbing panel 1e increases, for example, as the thickness of the sound absorbing material 2a existing along the top surface portion 14 increases. According to this tendency, the thickness T1 is made thicker than the thickness T2. As a result, the sound absorbing portion becomes longer as compared with the case where the thickness T1 is substantially equal to the thickness T2, and the sound absorbing effect of the diffracted sound DS1 can be further enhanced.

Further, in the sound absorbing panel 1e, the thickness of the upper part (top surface portion 14 side) of the sound absorbing panel 1e is thicker than the thickness of the lower part (bottom surface portion 15 side), so that the sound absorbing material 2a is placed on the upper part of the sound absorbing panel 1e. The arranged overhanging portion 24 is newly provided. When the overhanging portion 24 is provided, the overhanging portion 24 may be projected toward the back surface side in the direction of the back plate 12. As a result, the overhanging portion 24 does not protrude toward the road surface side, and for example, the contact between the sound absorbing panel 1e and the vehicle and the traveling of the vehicle are not hindered. Further, there is a relationship that the thickness T3 of the top surface portion 14 along the second plane direction Y is larger than the thickness T4 of the bottom surface portion 15 along the second plane direction Y. The overhang length T3-T4 along the second plane direction Y of the overhang portion 24 toward the back surface side may be 1.5 times or less the thickness T4.

Such a sound absorbing panel 1e has an advantage that the sound absorbing effect of the diffracted sound DS1 is improved, and when the sound absorbing wall 100 is installed on the uppermost stage of the sound insulating wall 100, the sound insulating wall 100 whose safety is maintained can be obtained. it can. Further, although the overhanging portion 24 overhangs to the back surface side, the overhanging length (T3-T4) of the overhanging portion 24 to the back surface side is 1.5 times or less the thickness T4. Therefore, the structure does not overhang greatly, and there is no problem in the landscape.

(Sixth Embodiment)
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. The schematic cross section shown in FIG. 12 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 12, where the sound absorbing panel 1f according to the example of the sixth embodiment is different from the sound absorbing panel 1d, the overhanging portion 24 is sound-absorbed by using the vertical partition member 22 and the horizontal partition member 23. This is an example provided on the upper part (top surface portion 14 side) of the panel 1f. As the vertical partition member 22, a metal plate-shaped member, a rubber or lead sheet-shaped member, a high-density cloth member (for example, a soundproof curtain, a soundproof curtain), or the like can be used. In this embodiment, the case where a metal plate-shaped member is used will be described.

The vertical partition member 22 and the horizontal partition member 23 are, for example, L-shaped in the ZY cross section. This makes it possible to further improve the sound absorbing effect of the diffracted sound DS1.

Further, in the sound absorbing panel 1f, the relationship between the thickness T1 and the thickness T2 may not be "T1> T2". However, in the sound absorbing panel 1f, there is a relationship that the thickness T3 of the top surface portion 14 along the second plane direction Y is larger than the thickness T4 of the bottom surface portion 15 along the second plane direction Y. Further, the overhanging portion 24 is projected toward the back side in the direction of the back plate 12 as in the sound absorbing panel 1e, so that the sound absorbing panel 1f is also installed on the uppermost stage of the soundproof wall 100 in the sound absorbing panel 1f. At that time, it is possible to obtain the advantage that the soundproof wall 100 in which the safety is maintained can be obtained. Further, although the overhanging portion 24 overhangs to the back surface side, the overhanging length T3-T4 of the overhanging portion 24 to the back surface side is 1.5 times or less the thickness T4. Therefore, the structure does not overhang greatly, and there is no problem in the landscape.

(7th Embodiment)
FIG. 13 is a schematic cross-sectional view showing an example of a sound absorbing panel according to a seventh embodiment of the present invention. The schematic cross section shown in FIG. 13 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 13, the sound absorbing panel 1g according to the example of the seventh embodiment is different from the sound absorbing panel 1 in that there is an air layer 25 between the sound absorbing material 2 and the back plate 12.

According to the sound absorbing panel 1g, 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 band from a high frequency range to a low frequency range.

By not providing the second opening 16b arranged on the top surface portion 14 of the sound absorbing panel 1g in the air layer 25, rainwater or the like does not enter the inside of the sound absorbing panel 1g, and the exterior material 10 is corroded or the sound absorbing material. It is possible to suppress the deterioration of 2.

In addition to the first embodiment, the seventh embodiment can be combined with the second to third embodiments.

(8th Embodiment)
FIG. 14 is a schematic cross-sectional view showing an example of a sound absorbing panel according to an eighth embodiment of the present invention. The schematic cross section shown in FIG. 14 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 14, the sound absorbing panel 1h according to the example of the eighth embodiment is different from the sound absorbing panel 1d in that the air layer 25 is provided between the sound absorbing material 2b and the back plate 12.

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

Also in the eighth 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 band from a high frequency range to a low frequency range.

In addition to the fourth embodiment, the eighth embodiment can be combined with the fifth embodiment and the sixth embodiment.

(9th Embodiment)
FIG. 15 is a schematic cross-sectional view showing an example of a sound absorbing panel according to a ninth embodiment of the present invention. The schematic cross section shown in FIG. 15 corresponds to the schematic cross section shown in FIG.

As shown in FIG. 15, the sound absorbing panel 1i according to the example of the ninth embodiment is different from the sound absorbing panel 1 in that the shape of the first opening 16a is a louver shape.

Since the sound absorbing panel 1i is arranged at the uppermost stage of the soundproof wall 100, noise from a vehicle or the like is emitted from below when viewed from the front of the sound absorbing panel 1i. By forming the first opening 16a into a louver shape, the sound emitted from below the front surface of the sound absorbing panel 1i can be efficiently taken in from the first opening 16a, and the sound absorbing property is improved.

Further, in the louver shape, since there is a canopy-shaped portion on the first opening 16a, there is an advantage that rainwater or the like is less likely to enter the inside of the exterior material 10.

In addition to the first embodiment, the ninth embodiment can be combined with any of the second to eighth embodiments.

As described above, according to the embodiment of the present invention, as described by the embodiment, the sound reduction effect can be obtained on the side and the lower side of the sound source and on the extension line from the sound source to the sound absorbing panel. Sound absorbing panels can be provided.

Although some of the 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 a translucent plate and a concrete plate may be used as the panel. Moreover, these embodiments can be carried out in combination as appropriate. Furthermore, the present invention can be implemented in various novel embodiments in addition to the above-mentioned some embodiments. Therefore, each of the above-mentioned several embodiments can be omitted, replaced, or changed in various ways without departing from the gist of the present invention. Such novel forms and modifications are included in the scope and gist of the present invention, as well as in the scope of the invention described in the claims and the equivalent of the invention described in the claims.

1: Sound absorbing panel (first embodiment)
1ba to 1bc: Sound absorbing panel (2nd embodiment: 1st to 3rd 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 (7th embodiment)
1h: Sound absorbing panel (8th embodiment)
1i: Sound absorbing panel (9th 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 17a: First sound transmission surface 17b: Second sound transmission surface 18: Sound insulation surface 19a: Front side upper edge corner 19b: Back side Upper edge corner 19c: Front lower edge corner 19d: Back lower edge corner 1r: Sound absorbing panel (reference example)
11r: Front plate 12r: Back plate 2: Sound absorbing material 2a: Sound absorbing material 2b: Sound absorbing material 21: Water repellent member 22: Vertical partitioning material 23: Horizontal partitioning material 23a: Upper part 23b: Lower part 24: Overhanging part 25: Air layer 3: Intermediate sound absorbing panel 31: Front plate (front part)
32: Back plate (back part)
36: Third opening 4: Support 100: Soundproof wall (first embodiment)
100r: Soundproof wall (reference example)
150: Wall railing 200: High bridge 201: High bridge wall railing 300: Building 350: Building W1: Width W2 of the first sound transmitting surface 17a along the second direction X: In the second direction X of the second sound transmitting surface 17b Width along T1: Thickness of the sound absorbing material 2a along the second plane direction Y T2: Thickness of the sound absorbing material 2b along the second plane direction Y T3: Thickness of the top surface portion 14 along the second plane direction Y T4: Thickness of the bottom surface 15 along the second plane direction Y DS1: Diffracted sound DS2: Diffracted sound TS: Transmitted sound SS: Sound source I: Extension line

Claims (8)

It is a sound absorbing panel installed on the top of the soundproof wall.
An exterior material having a front portion facing the sound source side, a back portion facing the sound receiving side, and a top surface portion provided between the front portion and the back portion.
The sound absorbing material incorporated in the exterior material is provided.
A first opening is provided in the front portion in the entire front portion.
A second opening is provided on the top surface portion.
The back surface is a sound absorbing panel characterized in that the upper end to the lower end are continuous surfaces. The sound absorbing panel according to claim 1, wherein a second opening is provided in the entire top surface portion. The sound absorbing panel according to claim 1 or 2, wherein at least a surface of the sound absorbing material located at the second opening is covered with a water-repellent member having breathability. The sound absorbing panel according to any one of claims 1 to 3, wherein the sound absorbing material is in contact with the top surface portion. The upper part of the sound absorbing panel is provided with an overhanging portion protruding from the lower part toward the back surface portion.
The sound absorbing panel according to any one of claims 1 to 4, wherein the sound absorbing material is further arranged on the overhanging portion. The sound absorbing panel according to claim 5, wherein the sound absorbing material arranged in the overhanging portion has a higher density than the sound absorbing material arranged on the front side. The sound absorbing panel according to any one of claims 1, 3 to 6, wherein an air layer is provided between the sound absorbing material and the back surface portion. The sound absorbing panel according to any one of claims 1 to 7, wherein the first opening has a louver shape.

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