JP2021075870A - Sound insulation panel and sound insulation wall - Google Patents

Abstract

To provide a sound insulation panel and a sound insulation wall which demonstrate excellent sound insulation properties, can maintain sound insulation for a long time, have excellent assembly workability and can be easily manufactured, and are easy to dispose of.SOLUTION: A sound insulation panel and a sound insulation wall include a front plate forming one surface facing the sound source side and a back plate to which the front plate is fixed and forming a surface opposite to the sound source side, the front plate includes a first end of the front plate, which is one end in the cross section, a second end of the front plate, which is the other end in the cross section, a reflective surface formed from a curved surface between the first end of the front plate and the second end of the front plate, and a hole that opens in the reflective surface and communicates the space between the front plate and the back plate and the outside, the first end of the front plate and the second end of the front plate are fixed to the back plate.SELECTED DRAWING: Figure 2

Description

The present invention relates to the structure of a sound insulation panel and a sound insulation wall installed on a road or a railway.

Conventionally, sound insulation walls have been installed along roads and railroads to suppress noise. For example, on a road, the sound insulation wall is provided in a wall shape along the shoulder of the road, and suppresses noise caused by the traveling of a vehicle traveling on the road from leaking to the outside of the road.

It is a sound insulation wall installed with the sound absorption surface of the sound insulation panel facing the railroad track, and the inside of a flat box composed of a perforated plate on the surface of the sound absorption surface and a steel plate on the back side is filled with a sound absorption material such as glass wool. Is known (see, for example, Patent Document 1).

It is a sound insulation wall installed on roads and railroads, and there is a sound insulation wall that is attached to the erected H-shaped steel by stacking multiple panel-shaped sound absorption plates filled with sound absorbing material in the box frame. For example, see Patent Document 2). These sound insulation walls have, for example, a sound absorbing material such as glass wool, asbestos, or polyester built in a box-shaped panel having a large number of sound absorbing holes bored in the front surface, or sandwiching them with a louver or the like. By absorbing the noise with this sound absorbing material, it is possible to prevent the noise of the vehicle traveling on the road or the like from leaking to the outside of the road.

Japanese Patent No. 3660335 Japanese Unexamined Patent Publication No. 2004-132018

The sound insulation walls of Patent Document 1 and Patent Document 2 are intended to absorb noise by a sound absorbing material, and are configured by sandwiching the sound absorbing material from the front side and the back side by a metal plate material, so that the structure becomes complicated and manufacturing is also possible. There was a problem that it was difficult and the cost increased.

Further, when sound absorbing materials such as glass wool, asbestos, and polyester are used, since they have water retention, there is a problem that they absorb the moisture of rainwater and snow, and the sound absorbing performance is temporarily lowered. Further, the absorption of water deteriorates the sound absorbing material, making it difficult to maintain the sound absorbing performance for a long period of time, and there is a problem that maintenance such as repair and replacement must be performed frequently.

Further, when the sound insulation wall is damaged, the sound absorbing material must be disposed of as industrial waste, which causes a problem that the treatment cost is high.

The present invention has been made to solve the above problems, exhibits excellent sound insulation, can maintain this sound insulation for a long period of time, has excellent assembly workability, can be easily manufactured, and is disposed of. It is an object of the present invention to provide a sound insulation panel and a sound insulation wall which can be easily performed.

As a means for solving the above-mentioned problems of the prior art, in the sound insulation panel according to the present invention, a front plate constituting one surface facing the sound source side and the front plate are fixed to the side opposite to the sound source side. The front plate includes a back plate constituting the surface of the front plate, the front plate first end portion which is one end portion in the cross section, the front plate second end portion which is the other end portion in the cross section, and the front plate. A reflective surface formed from a curved surface between the first end portion of the front plate and the second end portion of the front plate, and a space formed between the front plate and the back plate by opening to the reflective surface. A hole for communicating with the outside is provided, and the first end portion of the front plate and the second end portion of the front plate are fixed to the back plate.

The sound insulation wall according to the present invention is configured by stacking a plurality of the above sound insulation panels in the vertical direction.

According to the present invention, sound waves from a sound source are reflected on a reflective surface formed by a curved surface to diffuse noise, and the holes opened in the reflective surface and an internal space absorb the noise. As a result, the sound insulation panel suppresses the leakage of noise to the back side of the sound insulation panel. Further, since the sound insulation panel has a simple structure in which the inside is a space, the sound insulation property can be maintained for a long period of time, the assembly workability is improved, and the manufacturing and disposal are easy.

It is a perspective view of the sound insulation wall 100 which concerns on Embodiment 1. FIG. It is a front view of the sound insulation panel 10 which concerns on Embodiment 1. FIG. It is explanatory drawing of the cross-sectional structure of the sound insulation panel 10 of the sound insulation wall 100 which concerns on Embodiment 1. FIG. It is explanatory drawing of the noise reflection of the sound insulation wall 100 which concerns on Embodiment 1. FIG. It is explanatory drawing of the noise reflection of the sound insulation wall 1100 of the comparative example of Embodiment 1. FIG. It is a front view of the sound insulation panel 10A which is one of the modification of the sound insulation panel 10 which concerns on Embodiment 1. FIG. It is explanatory drawing of the cross-sectional structure of the sound insulation panel 210 which concerns on Embodiment 2. FIG. It is sectional drawing of the sound insulation panel 210A which is one of the modification of the sound insulation panel 210 which concerns on Embodiment 2. FIG. It is sectional drawing of the sound insulation panel 210B which is one of the modification of the sound insulation panel 210 which concerns on Embodiment 2. FIG. It is sectional drawing of the sound insulation panel 210C which is one of the modification of the sound insulation panel 210 which concerns on Embodiment 2. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. In addition, the shape, size, arrangement, etc. of the configurations shown in each figure can be appropriately changed within the scope of the present invention.

Embodiment 1.
FIG. 1 is a perspective view of the sound insulation wall 100 according to the first embodiment. The sound insulation wall 100 is erected on the road side of, for example, a highway or a railroad, and sound waves of noise generated from a road 91 (see FIG. 4) or a vehicle 90 traveling on a track (see FIG. 4) leak to the outside. It suppresses. Note that FIG. 1 shows a schematic structure of the sound insulation wall 100, and detailed structures such as holes 80 opened in the reflection surface 23 of the sound insulation panel 10 are omitted as appropriate.

The sound insulation wall 100 is configured by attaching a sound insulation panel 10 between two columns 1. The support column 1 is, for example, a steel material having an H-shaped cross section, and has a shape in which a web portion 3 is passed between the flange portions 2. The sound insulation panel 10 is inserted between the two flange portions 2 and attached to the support column 1. A plurality of sound insulation panels 10 are stacked between two columns 1 to form one sound insulation wall 100. The sound insulation wall 100 shown in FIG. 1 shows a structure in which a plurality of sound insulation panels 10 are attached between two columns 1, but in reality, a plurality of sound insulation walls 100 are continuously formed along a track of a highway or a railway. It is to be installed. In the first embodiment, a case where the sound insulation wall 100 is installed on the road side of the road 91 will be described as an example. The road side surface of the sound insulation wall 100 may be referred to as a front surface, and the surface opposite to the road may be referred to as a back surface.

(Sound insulation panel 10)
FIG. 2 is a front view of the sound insulation panel 10 according to the first embodiment. As for the sound insulation panel 10, FIG. 3 is an explanatory view of a cross-sectional structure of the sound insulation panel 10 of the sound insulation wall 100 according to the first embodiment. The sound insulation panel 10 is a combination of a front plate 20 forming a surface facing the road 91 side, which is the sound source side, and a back plate 30 forming a surface facing the side opposite to the road 91, and the side plate 50 is used as the front plate. It is formed by attaching from the side of 20 and the back plate 30. In the following description, the road 91 side may be referred to as a sound source side, and the side opposite to the road 91 side, which is the sound source side, may be referred to as a back surface side. As shown in FIG. 1, the sound insulation panel 10 is inserted between the flange portions 2 of the columns 1 and is stacked in plurality to form the sound insulation wall 100. The sound insulation panel 10 reflects and diffuses sound waves from the road side. Further, in the sound insulation panel 10, the spaces 13 and 14 formed by the holes 80 provided in the reflective surface 23 of the front plate 20 and the front plate 20 and the back plate 30 absorb the kinetic energy of the sound waves from the road side. It absorbs sound.

(Front plate 20)
The front plate 20 includes a reflecting surface 23 between an upper end portion 21 which is one end portion in a cross section and a lower end portion 22 which is the other end portion. The central portion 24 of the reflective surface 23 is located closer to the back plate 30 than the upper end portion 21 and the lower end portion 22. That is, the reflective surface 23 has a shape in which the center is recessed when viewed from the road side.

The upper end portion 21 of the front plate 20 is folded back to the back side at the upper end of the upper mounting portion 31 provided at the tip of the upper flange portion 36 of the back plate 30, and is placed on the upper flange portion 36 of the back plate 30. Is combined with. The upper end 21 of the front plate 20 is fixed to the upper surface of the back plate 30 by the fixing means 43. Further, the lower end portion 22 of the front plate 20 is folded back to the back side at the lower end of the lower mounting portion 32 provided at the tip of the lower flange portion 37 of the back plate 30, and holds the lower end of the lower mounting portion 32. It is combined to be crowded. In other words, the lower end portion 22 of the front plate 20 is assembled so as to be hooked from the lower side to the lower mounting portion 32 of the lower flange portion 37 of the back plate 30. The lower end portion 22 of the front plate 20 and the lower mounting portion 32 of the back plate 30 are fixed to each other by the fixing means 43.

As shown in FIG. 3, the upper mounting portion 31 is the tip of the upper flange portion 36 extending from the back surface portion 38 of the back plate 30, and is bent downward to form a flat surface facing the road 91 side. Further, the lower mounting portion 32 is bent downward at the tip of the lower flange portion 37 extending from the back surface portion 39 of the back plate 30, forming a flat surface facing the road 91 side.

At the upper end of the sound insulation panel 10, the portion where the front plate 20 and the back plate 30 are combined is referred to as an upper folded portion 15. At the lower end of the sound insulation panel 10, the portion where the front plate 20 and the back plate 30 are combined is referred to as a lower folded portion 16.

The front plate 20 is in contact with the tip surface 34 of the protruding portion 35 of the back plate 30 at the central portion 24 in the vertical direction of the reflecting surface 23, and is fixed by using the fixing means 43. In the first embodiment, the central portion 24 is a portion including the top of the reflecting surface 23 formed by a curved surface having a concave shape from the road 91 side to the back surface side. The portion where the front plate 20 and the back plate 30 are joined is referred to as a joint portion.

The fixing means 43 between the front plate 20 and the back plate 30 is, for example, blind rivet, bolt fastening, welding, or the like. The upper end 21 of the front plate 20 may be referred to as the first end of the front plate, and the lower end 22 of the front plate 20 may be referred to as the second end of the front plate.

The reflective surface 23 is formed so that the surface facing the road 91 side in the cross section has an arc shape. That is, the front plate 20 is formed between the upper end portion 21 and the lower end portion 22 as a part of a cylinder whose central axis is located on the road side. The central portion 24 of the front plate 20 is in contact with the tip surface 34 of the protruding portion 35 provided on the back plate 30. The central portion 24 of the front plate 20 comes into contact with the tip surface 34 of the protruding portion 35 and is fixed by the fixing means 43. The reflective surface 23 is a curved surface in which the surface of the front plate 20 is formed by an elliptical arc shape or other curves in the cross-sectional shape, in addition to the cylindrical surface in which the surface of the front plate 20 is arcuate in the cross-sectional shape. Is also good. Further, the reflective surface 23 may be positioned so that the apex of the concave shape is biased toward the upper end portion 21 side or the lower end portion 22 side.

As shown in FIG. 2, the front plate 20 includes a hole 80 that is open to the reflective surface 23. In the first embodiment, a plurality of holes 80 are formed in the reflecting surface 23, and each of them communicates with the internal space 13 or 14. The hole 80 is circular and has a predetermined opening area. However, the shape of the hole 80 is not limited to a circle, and may take various forms such as an ellipse, a rectangle, or a polygon. A predetermined number of holes 80 are arranged per unit area of the first region 71 and the second region 72 of the reflecting surface 23 excluding the central portion 24. In the first embodiment, the first region 71 of the reflection surface 23 is a portion located above the second region 72. The first region 71 is a part of the reflection surface 23 covering the road 91 side of the space 13 inside the sound insulation panel 10, and the second region 72 is the reflection covering the road 91 side of the space 14 inside the sound insulation panel 10. It is a part of the surface 23. In the sound insulation panel 10, the holes 80 provided in the first region 71 and the second region 72 are circular holes of the same size, the opening areas are the same, and the number of holes per unit area arranged is also the same. Is. The central portion 24 of the reflective surface 23 is in contact with the tip surface 34 of the protruding portion 35 of the back plate 30, and the hole 80 is not provided.

The hole 80 provided in the first region 71 communicates the space 13 formed between the front plate 20 and the back plate 30 with the space outside the sound insulation panel 10. The hole 80 provided in the second region 72 communicates the space 14 formed between the front plate 20 and the back plate 30 with the space outside the sound insulation panel 10. The space 13 is a space located on the upper end 21 side of the space 14. The space 14 is a space located on the lower end 22 side of the space 13. The space 13 and the space 14 are separated by a protrusion 35 of the back plate 30 inside the sound insulation panel 10.

(Back plate 30)
The back plate 30 is formed by bending a steel plate. The upper and lower ends of the back plate 30 are bent toward the road 91 (see FIG. 4) and protrude to form an upper flange portion 36 and a lower flange portion 37. The upper flange portion 36 and the lower flange portion 37 form an upper end surface and a lower end surface of the sound insulation panel 10, and when the sound insulation panels 10 are stacked vertically, the shapes of the upper end surface and the lower end surface of the sound insulation panel 10 are combined. As such, it is inclined upward from the back side to the front side. The upper end of the back plate 30 may be referred to as the first end of the back plate, and the lower end may be referred to as the second end of the back plate.

The back plate 30 includes back portions 38 and 39 that form a surface on the back side of the sound insulation panel 10. The back surface portions 38 and 39 have a flat plate shape as a whole. In the cross section, a protruding portion 35 toward the front plate 20 side is formed between the central portion of the back plate 30, that is, the back surface portion 38 and the back surface portion 39. The projecting portion 35 has two slope portions 33 extending inclined toward the front plate 20 side, a flat tip surface 34 is formed at the tip of the slope portion 33, and the central portion 24 of the front plate 20 is formed on the surface thereof. Are in contact with each other. It is desirable that the portion where the central portion 24 of the front plate 20 and the protruding portion 35 of the back plate 30 are in contact with each other is fixed by a fixing means 43 such as a blind rivet. Since the front plate 20 is made of a thin steel plate, it has relatively low rigidity and may vibrate due to the influence of wind or the like. By fixing the central portion 24 of the front plate 20 to the protruding portion 35 of the back plate 30, the central portion 24 of the front plate 20 having low rigidity is formed with the protruding portion 35 of the highly rigid back plate 30 in three dimensions. Since it is integrated, it is possible to suppress the occurrence of vibration of the reflective surface 23 of the front plate 20. When the front plate 20 is thick and has high rigidity, it is not always necessary to fix the central portion 24 of the front plate 20.

The thickness of the front plate 20 and the back plate 30 is preferably set between 0.25 mm and 3.2 mm. For example, the plate thickness of the front plate 20 can be set to 0.6 mm, and the plate thickness of the back plate 30 can be set to 1.6 mm. As the material of the front plate 20 and the back plate 30, it is preferable to use a plated steel plate having a high surface design and excellent corrosion resistance, such as ZAM (registered trademark, hereinafter omitted). As the front plate 20 and the back plate 30, a plated steel plate having excellent corrosion resistance may be used in addition to the ZAM steel plate, and for example, a stainless steel plate or an aluminum steel plate may be used. Alternatively, the front plate 20 and the back plate 30 may be made of colored or painted steel plates or the like.

Further, a standard sound insulation panel called a unified plate (standard type) used as a conventional sound insulation wall is a combination of a front plate and a back plate provided with an opening, and has a sound absorbing member inside. In this conventional sound insulation panel, aluminum is used as the material of the front plate, and plated steel plate is used as the material of the back plate. When such dissimilar metals are combined, corrosion may occur at the contact portion between the front plate and the back plate. On the other hand, in the sound insulation panel 10 according to the first embodiment, since the same material is used for the front plate 20 and the back plate 30, the risk of corrosion due to contact with dissimilar metals is reduced. However, the sound insulation panel 10 is not limited to one made of only the same kind of metal, and may include a member made of a dissimilar metal as a material.

(Action of sound insulation wall 100)
FIG. 4 is an explanatory diagram of noise reflection of the sound insulation wall 100 according to the first embodiment. The sound insulation wall 100 is erected on the road side such as the road 91, and suppresses noise such as running noise and exhaust noise of the vehicle 90 traveling on the road 91 from leaking to the outside. That is, in FIG. 4, the sound insulation wall 100 has a function of making it difficult for sound waves from the road 91 side to reach the region on the back surface side of the sound insulation wall 100. A plurality of sound insulation panels 10 are stacked between two columns 1 to form a sound insulation wall 100. A tab portion 12 (see FIGS. 2 and 3) extending downward is formed on the road 91 side at the lower end of the sound insulation panel 10, and is configured to close the gap between the upper and lower sound insulation panels 10. There is. Since the tab portion 12 closes the gap between the upper and lower sound insulation panels 10, it not only suppresses sound waves passing through the gap and suppresses noise from leaking to the back side of the sound insulation panel 10, but also rainwater enters the gap. It has the effect of suppressing the noise.

Each sound insulation panel 10 of the sound insulation wall 100 is installed with the reflection surface 23 of the front plate 20 facing the road 91 side. Each arrow shown in FIG. 4 schematically represents a sound wave of noise generated from the vehicle 90. The sound wave from the sound source P is diffused in all directions around the sound source P. The sound wave that has traveled toward the sound insulation wall 100 is reflected at the same angle as the incident angle at each point where it hits the front plate 20 of each sound insulation panel 10. For example, the sound wave reflected by the central portion 24 of the reflecting surface 23A of the sound insulation panel 10A arranged at the position closest to the surface of the road 91 is reflected so as to proceed toward the sound source P as it is. Further, the sound waves reflected on the surface located above the central portion 24 of the reflecting surface 23A are reflected upward, and the sound waves reflected on the surface located below the central portion 24 of the reflecting surface 23A are reflected. It is reflected toward the surface of the road 91. These reflected sound waves are reflected on the surface of the road 91 or the vehicle 90 traveling on the road 91, or hit the sound insulation wall 100 on the opposite side of the road 91, and are repeatedly reflected and gradually attenuated. Each sound insulation panel 10 reflects sound waves, and the back plate 30 and the front plate 20 form spaces 13 and 14 inside the sound insulation panel 10. It is not necessary to install a filling material such as a sound absorbing material in the spaces 13 and 14, and the sound insulating panel 10 has a simple structure and high durability.

Further, since the reflecting surface 23B of the sound insulation panel 10B arranged in the middle stage is located above the sound source P, the reflected sound wave is generally reflected upward. However, the direction of reflection at each point of the reflecting surface 23B is dispersed and reflected by the cylindrical surface of the reflecting surface 23B. Similarly, in the sound insulation panel 10C arranged in the upper stage, the direction in which the sound wave emitted from the sound source P is reflected is generally reflected upward, but the direction in which the sound wave is reflected at each point is the reflection surface 23C. It is dispersed and reflected by the cylindrical surface. For example, the direction of reflection at the lower part of the reflecting surface 23C is a direction close to directly above, but the direction of reflection at the upper part of the reflecting surface 23C is a direction close to horizontal.

As described above, the reflecting surface 23 of each sound insulation panel 10 diffuses the sound wave from the sound source P as shown in FIG. On the other hand, the sound insulation panel 10 absorbs sound through the holes 80 provided in the reflection surface 23 and the space 13 or 14 inside the sound insulation panel 10. Since the hole 80 is provided in the reflecting surface 23, sound waves enter the hole 80 as shown in FIG. Since there is a space 13 or 14 having a predetermined volume inside the sound insulation panel 10, when a sound wave reaches the hole 80, the air inside the hole 80 and the space 13 or 14 vibrates and is centered on a predetermined frequency. Absorbs the kinetic energy of sound. That is, a part of the sound waves arriving from the sound source P is absorbed by the holes 80 and the space 13 or 14 inside the sound insulation panel 10. That is, the sound insulation panel 10 absorbs a part of the sound wave from the sound source P by the sound absorbing action by Helmholtz resonance.

FIG. 5 is an explanatory diagram of noise reflection of the sound insulation wall 1100 of the comparative example of the first embodiment. The surface of the sound insulation wall 1100 of the comparative example is a flat surface perpendicular to the surface of the road 91. Therefore, the sound wave emitted from the sound source P is reflected upward at each point above the sound source P, and is reflected downward at each point below the sound source P.

The sound insulation walls 100 and 1100 are installed up to a position higher than the vehicle 90 traveling on the road side of the road 91, for example, but the space above the road 91 is usually open. Therefore, since the sound wave from the sound source P traveling to the side of the road 91 hits the sound insulation walls 100 and 1100 and is reflected, the sound wave does not directly reach the region on the back side of the sound insulation walls 100 and 1100. However, the sound waves traveling directly upward and diagonally upward from the sound source P pass over the sound insulation walls 100 and 1100 and leak to the outside of the road 91. Therefore, it can be said that the sound insulation effect is low when a large amount of sound waves are emitted to the outside of the road 91 over the sound insulation walls 100 and 1100. This means that the sound insulation effect is low not only when there are many sound waves that directly exceed the sound insulation walls 100 and 1100 from the sound source P, but also when there are many sound waves that are reflected and exceed the sound insulation walls 100 and 1100.

In the sound insulation wall 1100 according to the comparative example, the reflected sound waves are reflected in substantially the same direction, so that the noise easily leaks to the outside of the road 91 beyond the upper part of the sound insulation wall 1100 installed on the road side. For example, the sound waves reflected by the sound insulation wall 1100 in the region above the sound source P shown in FIG. 4 travel in substantially the same direction without being diffused. Therefore, the sound waves emitted from the sound source P at the same time are reflected and emitted from the open portion above the road 91 to the outside of the road 91 at almost the same time.

On the other hand, in the sound insulation wall 100 according to the first embodiment, the reflected sound wave is dispersed and reflected in each of the upper and lower directions according to the reflected position. Therefore, the amount of sound waves that simultaneously leak to the outside of the road 91 beyond the sound insulation wall 100 is smaller than that of the sound insulation wall 1100 of the comparative example. In addition, in FIGS. 3 and 4, only the sound wave emitted from one sound source P is displayed, but in reality, noise may be generated from various positions on the road 91. In the sound insulation wall 100 according to the first embodiment, sound waves are dispersed and reflected by each sound insulation panel 10 regardless of the height of the sound source P. Therefore, even in the actual sound source on the road 91, it can be said that the amount of sound waves emitted from the sound insulation wall 100 beyond the sound insulation wall 100 to the outside of the road 91 is smaller than that of the sound insulation wall 1100 according to the comparative example. In particular, since the reflective surface 23 of the sound insulation panel 10 is a curved surface having a concave shape from the road 91 side to the back surface side, the sound insulation effect is only high because sound absorption is performed while reflecting and diffusing sound waves as described above. In addition, since it does not protrude to the road 91 side, the installation space can be reduced.

Further, the sound insulation wall 1100 according to the comparative example does not have a hole 80 in the reflection surface 23 like the sound insulation panel 10. Therefore, since the sound insulation wall 1100 does not have the sound absorption effect of the sound insulation panel 10, the sound waves that reach the sound insulation wall 1100 are reflected without being absorbed. On the other hand, the sound insulation wall 100 according to the first embodiment not only disperses and reflects the reflected sound waves, but also absorbs a part of the sound waves. As a result, the amount of sound waves that exceed the sound insulation wall 100 and go out of the road 91 is smaller than that of the sound insulation wall 1100 according to the comparative example.

(Modification example of the sound insulation panel 10 according to the first embodiment)
The sound absorption by the sound insulation panel 10 according to the first embodiment depends on the opening area of the hole 80, the aperture ratio of the hole 80 formed in the predetermined region, and the volumes of the spaces 13 and 14, and the sound absorption and the frequency of the sound to be absorbed. The band fluctuates. For example, in the front view of the sound insulation panel 10 shown in FIG. 2, the number of holes 80 opened in the first region 71 may be smaller than the number of holes 80 opened in the second region 72. Further, even if the total opening area of the holes 80 provided per unit area of the first region 71 is made smaller than the total opening area of the holes 80 provided per unit area of the second region 72. good. In this way, by providing a difference in the opening area between the hole 80 provided in the first region 71 and the hole 80 provided in the second region 72, the frequency band of the sound absorbed in the first region 71 is provided. And the frequency band of the sound absorbed in the second region 72 can be made different. As a result, the sound insulation panel 10 can absorb sounds in a plurality of frequency bands and can improve the sound absorption effect. In the first embodiment, in the sound insulation panel 10, the first region 71 is arranged above the reflecting surface 23 and the second region 72 is arranged below the reflecting surface 23, but this arrangement is reversed. You may. Further, a plurality of holes 80 may be provided on the reflecting surface 23 and may include a first hole and a second hole having different opening areas, and may be composed of two or more types of holes 80 having different opening areas. good.

Further, in the cross-sectional view of the sound insulation panel 10 shown in FIG. 3, the volume of the space 13 may be smaller than the volume of the space 14. In the sound insulation panel 10 according to the first embodiment, the volume of the space 13 and the volume of the space 14 are substantially the same. When the space 13 is the first space and the space 14 is the second space, the volume of the first space may be smaller than the volume of the second space. With this configuration, the frequency band of the sound absorbed by the holes 80 communicating with the first space and the first space is the frequency of the sound absorbed by the holes 80 communicating with the second space and the second space. It can be configured differently from the band. For example, in the sound insulation panel 10, the volume of the space 13 and the volume of the space 14 can be changed by shifting the position of the protrusion 35 that separates the space 13 and the space 14 upward in FIG. As a result, the volume of the space 13 can be reduced and the volume of the space 14 can be increased, so that the frequency band that absorbs sound in the space 13 and the frequency band that absorbs sound in the space 14 can be changed to be different. The sound insulation panel 10 may change the volume of the space 13 and the volume of the space 14 by changing the positions of the back surface portions 38 and 39.

FIG. 6 is a front view of the sound insulation panel 10A, which is one of the modifications of the sound insulation panel 10 according to the first embodiment. In the sound insulation panel 10A, partition members 61 and 62 are added to the inside of the sound insulation panel 10, and the space inside the sound insulation panel 10A is divided into more spaces. That is, the sound insulation panel 10A shown in FIG. 6 includes a first space, a second space, a third space, and a fourth space inside. The sound insulation panel 10A can absorb sound in a larger frequency band by providing a plurality of spaces inside. The partition members 61 and 62 are plate-shaped, and the plate surface is directed in the left-right direction to partition the space inside the sound insulation panel 10A in the left-right direction. By arranging the partition members 61 and 62 so as to be offset from the central portion of the sound insulation panel 10 in any of the left-right directions, the volumes of the plurality of spaces arranged side by side along the left-right direction of the sound insulation panel 10 are different from each other. be able to. The vertical direction of the sound insulation panels 10 and 10A in FIGS. 2 and 6 may be referred to as a first direction, and the left-right direction may be referred to as a second direction. In other words, the first direction is the short side direction of the sound insulation panels 10 and 10A, and the second direction is the long side direction of the sound insulation panels 10 and 10A.

In the sound insulation panel 10A, the partition members 61 and 62 may be arranged so as to be offset from each other in the left-right direction. With this configuration, the first space to the fourth space of the sound insulation panel 10A have different volumes. Further, the hole 80 communicating with each of the first space to the fourth space can change the opening area communicating with each space and the external space. For example, the area per hole 80 communicating with the first space may be reduced. Further, the area where the hole 80 communicating with the first space is arranged is the first area 71, and the area where the hole 80 communicating with the second space is arranged is the second area 72 and the hole 80 communicating with the third space. The first area 71, the second area 72, and the third area 73, when the area in which is arranged is the third area 73 and the area in which the hole 80 communicating with the fourth space is arranged is the fourth area 74. , And the arrangement quantity of the holes 80 opened in the fourth region 74 per unit area may be changed.

Further, in the first region 71, which is one region of the reflective surface 23 of the sound insulation panel 10A, the arrangement quantity of the holes 80 per unit area may be changed. That is, the holes 80 may be provided so as to gradually increase the arrangement density of the holes 80 from the left end to the right end of the first region 71. With this configuration, the first region 71 of the sound insulation panel 10A can widen the frequency band of sound that can be absorbed. The second region 72, the third region 73, and the fourth region 74 of the sound insulation panel 10A may also change the arrangement density of the holes 80 in one region, respectively.

Embodiment 2.
Next, the sound insulation panel 210 according to the second embodiment will be described. The sound insulation panel 210 according to the second embodiment is a modification of the shape of the front plate 20 of the sound insulation panel 10 according to the first embodiment. In the second embodiment, the changes to the first embodiment will be mainly described. Regarding each part of the sound insulation panel 210 according to the second embodiment, those having the same function in each drawing shall be displayed with the same reference numerals as those used in the description of the first embodiment.

FIG. 7 is an explanatory view of a cross-sectional structure of the sound insulation panel 210 according to the second embodiment. The sound insulation panel 210 is formed by combining a front plate 220 that forms a surface facing the road 91 side and a back plate 30 that forms a surface facing the road 91 side. The front plate 220 includes a reflective surface 223 between an upper end portion 221 which is one end portion in a cross section and a lower end portion 222 which is the other end portion. The reflective surface 23 of the sound insulation panel 10A according to the first embodiment has a concave shape when viewed from the road 91 side, whereas the reflective surface 223 has a convex shape toward the road 91 side.

The central portion 24 of the reflective surface 223 is convex toward the road. That is, the reflective surface 223 has a shape protruding toward the road side in the cross-sectional structure, and the apex protrudes toward the road side from the upper end portion 221 and the lower end portion 222 of the front plate 220. The reflective surface 223 is formed so that the surface facing the road 91 side in the cross section has an arc shape. That is, the reflective surface 223 of the front plate 220 is formed as a part of a cylindrical surface whose central axis is located on the back surface side between the upper end portion 221 and the lower end portion 222.

In the sound insulation panel 210, the central portion 24 of the front plate 220 and the protruding portion 35 of the back plate 30 are fixed to each other by an intermediate member 40. The intermediate member 40 is fixed to the protruding portion 35 of the back plate 30, and the central portion 24 of the front plate 220 can be fixed at a position closer to the road 91 than the tip surface 34 of the protruding portion 35. The intermediate member 40 and the back plate 30, and the intermediate member 40 and the front plate 220 may be fixed by a fixing means 43 such as a blind rivet or welding. As shown in FIG. 7, the intermediate member 40 has a U-shaped cross section, but is provided with the fixing means 43 in contact with the protruding portion 35 of the back plate 30 and the central portion 24 of the front plate 20. Other shapes may be used as long as they are configured as such. The length of the intermediate member 40 in the cross section shown in FIG. 7 can be changed according to the distance between the central portion 24 of the front plate 220 and the protruding portion 35 of the back plate 30. By changing the length of the intermediate member 40 in the cross section shown in FIG. 7 and the front plate 220, the curvature of the reflecting surface 223 of the front plate 220 can be appropriately set.

The reflection surface 223 is provided with a plurality of holes 80 like the reflection surface 23 of the sound insulation panel 10 according to the first embodiment. In the sound insulation panel 210 according to the second embodiment, the opening area and the arrangement quantity of the holes 80 can be changed in the same manner as the sound insulation panels 10 and 10A according to the first embodiment.

The intermediate member 40 partitions the spaces 13 and 14 inside the sound insulation panel 210. In the sound insulation panel 210, the space inside the sound insulation panel 210 is partitioned in the left-right direction of the sound insulation panel 210 by the partition members 61 and 62, similarly to the sound insulation panel 10A according to the first embodiment. The position of the intermediate member 40 can be changed in the left-right direction of the sound insulation panel 210, and the volumes of a plurality of spaces inside the sound insulation panel 210 can be appropriately changed.

In the sound insulation panel 210 according to the second embodiment, since the reflecting surface 223 has a curved surface convex on the road 91 side, the reflected sound waves are diffused in each of the upper and lower directions according to the reflected position. Further, since the sound insulation panel 210 includes holes 80 that communicate the internal spaces 13 and 14 with the external space, it is possible to absorb a part of the sound that has reached the reflection surface 223.

(Modified Example of Embodiment 2)
FIG. 8 is a cross-sectional view of the sound insulation panel 210A, which is one of the modifications of the sound insulation panel 210 according to the second embodiment. The front plate 220 of the sound insulation panel 210A includes a reflective surface 223A between the upper end portion 221A, which is one end portion in the cross section, and the lower end portion 222A, which is the other end portion. The central portion 24 of the reflective surface 223A is convex toward the road. That is, the reflective surface 223A has a shape that protrudes toward the road in the cross-sectional structure, and the apex protrudes toward the road side from the upper end portion 221A and the lower end portion 222A. The upper end portion 221A and the lower end portion 222A are formed with contact portions 25 and 26 which are bent and extend toward the road 91 side. The abutting portions 25 and 26 abut from the inside on the inner surface of the upper flange portion 36 and the lower flange portion 37 of the back plate 30, that is, the surface between the root and the tip of the upper flange portion 36 and the lower flange portion 37. , Fixed. To fix the front plate 220A and the back plate 30, the contact portions 25 and 26 are brought into contact with the inner side surfaces of the upper flange portion 36 and the lower flange portion 37, and fixing such as blind rivet, bolt fastening, or welding is performed. This is done by means 43. The upper end portion 221A of the front plate 220A may be referred to as the first end portion of the front plate, and the lower end portion 222A of the front plate 220A may be referred to as the second end portion of the front plate.

As described above, the front plate 220A and the back plate 30 form the reflective surface 223A of the front plate 220A, and then the contact portion 25 of the upper end portion 221A and the upper flange portion 36 are fixed by the fixing means 43. The contact portion 26 of the lower end portion 222A and the lower flange portion 37 are fixed by the fixing means 43. The contact portion 25 of the upper end portion 221A of the front plate 220A is in contact with the corner portion between the inner side surface of the upper flange portion 36 of the back plate 30 and the back surface portion 38, and is pressed and fixed by elastic force. You may. On the other hand, the contact portion 26 of the lower end portion 222A of the front plate 220A may be in contact with the inner side surface of the lower flange portion 37 of the back plate 30 and the back surface portion 39, and may be pressed by an elastic force. With this configuration, the sound insulation panel 210A can form spaces 13 and 14 between the upper end portion 221 of the front plate 220A and the protruding portion 35 of the back plate 30, and between the lower end portion 222A and the protruding portion 35. ..

The reflective surface 223A of the sound insulation panel 210A is formed so that the surface facing the road 91 side in the cross section has an arc shape. That is, the reflective surface 223A of the front plate 220A is formed between the upper end portion 221A and the lower end portion 222A as a part of a cylindrical surface whose central axis is located on the back side. The central portion 24 of the front plate 220A is in contact with the tip surface 34 of the protruding portion 35 provided on the back plate 30. The central portion 24 of the front plate 220A is in contact with the tip surface 34 of the protruding portion 35 and is fixed by the fixing means 43.

Since the sound insulation panel 210A is provided with a hole 80 that opens into the reflection surface 223A, sound can be diffused and sound can be absorbed in the same manner as the sound insulation panel 210 according to the second embodiment. The opening area and the arrangement quantity of the holes 80 of the sound insulation panel 210A can be appropriately changed as in the case of the sound insulation panel 210A according to the second embodiment. Further, the sound insulation panel 210A may also include an intermediate member 40.

FIG. 9 is a cross-sectional view of the sound insulation panel 210B, which is one of the modifications of the sound insulation panel 210 according to the second embodiment. The sound insulation panel 210B is the same in that the front plate 220B is provided with the reflection surface 223B, but the reflection surface 223B is located on the road 91 side of the reflection surface 223A of the sound insulation panel 210A. Since the central portion 24 of the reflective surface 223B is located away from the protruding portion 35 of the back plate 30 toward the road 91 side, the central portion 24 and the protruding portion 35 are formed by using the intermediate member 40 as in the sound insulation panel 210. It is connected. By changing the length of the intermediate member 40 shown in FIG. 9, the sound insulation panel 210B can change the amount of protrusion of the reflective surface 223B and change the volumes of the internal spaces 13 and 14. Can be done. Thereby, the sound insulation panel 210B can change the frequency band of the sound that can be absorbed by the holes 80 and the spaces 13 and 14.

FIG. 10 is an explanatory view of a cross-sectional structure of the sound insulation panel 210C, which is one of the modifications of the sound insulation panel 210 according to the second embodiment. The sound insulation panel 210C is formed by combining a front plate 220C forming a surface facing the road 91 side and a back plate 30 forming a surface facing the opposite side of the road 91. The front plate 220C includes two reflecting surfaces 223C between the upper end portion 221 which is one end portion and the lower end portion 222 which is the other end portion in the cross section. The central portion 225C of the two reflecting surfaces 223C is formed so as to be located closer to the road 91 than the upper end portion 221 and the central portion 24 and the lower end portion 222 of the front plate 220C. Alternatively, the central portion 225C of the two reflecting surfaces 223C is formed so as to be located at least on the road 91 side of the central portion 24 of the front plate 220C. The central portion 225C does not have to be the apex of the protruding portion of the reflecting surface 223C. That is, the vertices of the protruding portions of the reflecting surface 223C may be biased toward the upper end portion 221 side or the lower end portion 222 side, or may be biased toward the central portion 24 side.

The front plate 220C is fixed to the back plate 30 in the same manner as the front plate 220 of the sound insulation panel 210 according to the second embodiment. That is, the upper end portion 221 of the front plate 220C is folded back to the back side at the upper end of the upper mounting portion 31 provided at the tip of the upper flange portion 36 of the back plate 30, and is placed on the upper flange portion 36 of the back plate 30. Combined to fit. Further, the lower end portion 222 of the front plate 220C is folded back to the back side at the lower end of the lower mounting portion 32 provided at the tip of the lower flange portion 37 of the back plate 30, and holds the lower end of the lower mounting portion 32. It is combined to be crowded.

The front plate 220C is fixed to the protruding portion 35 of the back plate 30 via the intermediate member 40. As a result, the sound insulation panel 210C can increase the curvature of the reflecting surface 223C, so that the sound wave diffusion performance is improved. Further, since the sound insulation panel 210C includes a hole 80 opened in the reflection surface 223C, sound can be absorbed by the hole 80 and the spaces 13 and 14. Further, similarly to the sound insulation panel 210 according to the second embodiment, the sound insulation panel 210C is configured by arranging the reflection surface 223C of the front plate 220C on the surface on the road 91 side, and is therefore excellent in aesthetic appearance.

Further, the sound insulation panels 10, 10A, 210, 210A, 210B, and 210C disclosed in the first and second embodiments can all have the same back plate 30. Therefore, the front plates 220, 220A, 220B, and 220C can be changed, and the shape of the reflecting surface can be appropriately changed by using necessary parts such as the intermediate member 40. By sharing the back plate 30, there is an advantage that the manufacturing cost of the sound insulation panels 10, 10A, 210, 210A, 210B, and 210C can be suppressed, and the manufacturing becomes easy.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the configuration of the above-described embodiments. For example, the reflecting surfaces 23, 223, 223A, 223B, and 223C may have a cross section not only an arc shape but also an elliptical arc, a parabola, a hyperbola, or a shape similar thereto. Further, the sound insulation panels 10, 10A, 210, 210A, 210B, and 210C are composed of a combination of two parts of the front plate 220, 220A, 220B, 220C and the back plate 30, but are integrally configured. It may be configured by combining more members. In short, it should be added that the gist (technical scope) of the present invention also includes various modifications, applications, and uses made by those skilled in the art as necessary.

1 prop, 2 flange, 3 web, 10 sound insulation panel, 10A sound insulation panel, 10B sound insulation panel, 10C sound insulation panel, 12 tab part, 13 space, 14 space, 15 upper folding part, 16 lower folding part, 20 front plate , 21 upper end, 22 lower end, 23 reflective surface, 23A reflective surface, 23B reflective surface, 23C reflective surface, 24 central part, 25 contact part, 25C central part, 26 contact part, 30 back plate, 31 upper mounting Part, 32 Lower mounting part, 33 Slope part, 34 Tip surface, 35 Protruding part, 36 Upper flange part, 37 Lower flange part, 38 Back part, 39 Back part, 40 Intermediate member, 43 Fixing means, 50 Side plate , 61 Partition member, 71 1st area, 72 2nd area, 73 3rd area, 74 4th area, 80 holes, 90 vehicles, 91 roads, 100 sound insulation walls, 210 sound insulation panels, 210A sound insulation panels, 210B sound insulation panels, 210C Sound insulation panel, 220 front plate, 220A front plate, 220B front plate, 220C front plate, 221 upper end, 221A upper end, 222 lower end, 222A lower end, 223 reflective surface, 223A reflective surface, 223B reflective surface, 223C reflective surface , 225C central part, 1100 sound insulation wall, P sound source.

Claims (16)

The front plate that constitutes one surface facing the sound source side,
The front plate is fixed, and the back plate constituting the surface opposite to the sound source side is provided.
The front plate is
The first end of the front plate, which is one end in the cross section,
The second end of the front plate, which is the other end in the cross section,
A reflective surface formed from a curved surface between the first end of the front plate and the second end of the front plate,
It is provided with a hole that opens in the reflective surface and communicates with the outside and the space formed between the front plate and the back plate.
The first end of the front plate and the second end of the front plate are
A sound insulation panel fixed to the back plate. The hole is
A plurality of holes are provided on the reflecting surface, and include at least a first hole and a second hole.
The opening area of the first hole is
The sound insulation panel according to claim 1, which is smaller than the opening area of the second hole. The sound insulation panel according to claim 2, wherein the first hole and the second hole have different shapes. The reflective surface is
When a plurality of areas including the first area and the second area are defined,
The first region and the second region
The holes are opened in each,
The opening area of the hole per unit area of the first region is
The sound insulation panel according to claim 1 or 2, which is smaller than the opening area of the hole per unit area of the second region. The reflective surface is
When a plurality of areas including the first area and the second area are defined,
The first region and the second region
Each of them is provided with the hole.
The number of holes provided per unit area of the first region is
The sound insulation panel according to claim 1 or 2, wherein the number of holes is smaller than the number of holes per unit area of the second region. The space formed between the front plate and the back plate is
Including at least the first space and the second space,
The volume of the first space is
The sound insulation panel according to any one of claims 1 to 5, which is smaller than the volume of the second space. A joint portion for joining the front plate and the back plate is provided at a central portion between the first end portion of the front plate and the second end portion of the front plate.
The first space is
It is located closer to the first end of the front plate than the joint.
The second space is
The sound insulation panel according to claim 6, which is located closer to the second end of the front plate than the joint. A partition member is further provided between the front plate and the back plate.
The partition member is
It is arranged along the first direction from the first end of the front plate to the second end of the front plate.
The sound insulation panel according to any one of claims 1 to 7, wherein the space formed between the front plate and the back plate is partitioned in a second direction intersecting the first direction. The reflective surface is
It is formed so as to project toward the sound source.
The vertices of the curved surface are
The sound insulation panel according to any one of claims 1 to 8, which is located closer to the sound source than the first end of the front plate and the second end of the front plate. The reflective surface is
The central portion between the first end portion of the front plate and the second end portion of the front plate is formed from a curved surface located closer to the back plate side than the first end portion of the front plate and the second end portion of the front plate. The sound insulation panel according to any one of claims 1 to 8. The back plate is
The first end of the back plate, which is one end, the second end of the back plate, which is the other end,
It has a protrusion toward the front plate side provided between the first end of the back plate and the second end of the back plate.
The protrusion of the back plate
An intermediate member is fixed to the tip,
The central part of the front plate is
The sound insulation panel according to claim 9 or 10, which is fixed to the intermediate member. The back plate is
The first end of the back plate, which is one end, the second end of the back plate, which is the other end,
It has a protrusion toward the front plate side provided between the first end of the back plate and the second end of the back plate.
The central part of the front plate is
The sound insulation panel according to claim 9 or 10, which abuts on the tip of the protruding portion. The reflective surface is
The sound insulation panel according to any one of claims 1 to 12, which has an arc shape in a cross section. A sound insulation wall formed by stacking a plurality of sound insulation panels according to any one of claims 1 to 13 in the vertical direction. The upper end surface and the lower end surface of the sound insulation panel are
The sound insulation wall according to claim 14, which is formed so as to incline downward from the front plate to the back plate. The sound insulation panel is
The sound insulation wall according to claim 14 or 15, wherein a tab portion projecting downward is formed at the lower end portion.

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