JP2020070586A - Sound insulation panel and sound insulating wall - Google Patents

Abstract

To provide a sound insulation panel and sound insulating wall which exhibit excellent sound insulation, can maintain the sound insulation for a long period of time, has excellent assembly workability, can be easily manufactured, and can be easily disposed.SOLUTION: The sound insulation panel and sound insulating wall each include a front plate that forms one surface facing q sound source side, and a back plate to which the front plate is fixed and that forms a surface opposite to the sound source side. The front plate comprises a front plate first end which is one end in cross section, a front plate second end which is the other end fixed to the back plate, and a reflective surface formed by a curved surface in which a central part between the front plate first end and the front plate second end is located closer to the rear plate than the front plate first end and the front plate second end.SELECTED DRAWING: Figure 1

Description

  The present invention relates to the structure of sound insulation panels and sound insulation walls installed on roads and railways.

  Conventionally, sound insulation walls have been installed along roads and railways 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 the noise accompanying the traveling of the vehicle traveling on the road from leaking to the outside of the road.

  A sound insulation wall installed on the railroad track with the sound absorption surface of the sound insulation panel facing, and the sound absorption surface was filled with a sound absorbing material such as glass wool inside a flat box composed of a perforated plate on the surface and a steel plate on the back side. The thing is known (for example, refer patent document 1).

  There is a sound insulation wall that is installed on roads and railroads, in which a sound insulation wall is installed by vertically arranging a panel-shaped sound absorption plate filled with sound absorption material in a box frame on a vertical H-shaped steel ( See, for example, Patent Document 2). These sound insulation walls, for example, a sound absorbing material such as glass wool, asbestos, polyester or the like is built into the inside of a box-shaped panel having a large number of sound absorbing holes formed on the front surface, or they are sandwiched by louvers or the like. By absorbing the noise with the sound absorbing material, the noise of the vehicle traveling on the road or the like is suppressed from leaking to the outside of the road.

Japanese Patent No. 3660335 JP, 2004-132018, A

  The sound insulation walls of Patent Document 1 and Patent Document 2 are trying to absorb noise by a sound absorbing material, and the sound absorbing material is sandwiched between metal plate materials from the front side and the back side, so that the structure is complicated and manufacturing is also difficult. There was a problem that the cost was difficult to increase.

  Further, when a sound absorbing material such as glass wool, asbestos, polyester, etc. is used, since these have water retention, there is a problem that the sound absorbing performance is temporarily lowered by absorbing the water of rainwater or snow. In addition, there is a problem in that the sound absorbing material deteriorates due to the absorption of the water, and it becomes difficult to maintain the sound absorbing performance for a long period of time, and maintenance such as repair and replacement must be frequently performed.

  Further, when the sound insulation wall is damaged, the sound absorbing material has to be disposed of as industrial waste, which raises a problem that the processing cost becomes 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, is excellent in assembling workability and can be easily manufactured, and can be disposed of. It is an object of the present invention to provide a sound insulation panel and a sound insulation wall that can be easily performed.

  As a means for solving the above-mentioned problems of the conventional art, the sound insulation panel according to the present invention is a front plate that constitutes one surface facing the sound source side, and the front plate is fixed, and the opposite side to the sound source side. And a rear plate that constitutes the surface of the front plate, wherein the front plate has a front plate first end that is one end and a front plate second end that is the other end in cross section fixed to the rear plate. From the curved surface in which the central portion between the front plate first end and the front plate second end is located on the back plate side with respect to the front plate first end and the front plate second end. It has a formed reflective surface.

  A 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, the sound wave from the sound source is reflected on the reflecting surface formed by the curved surface, so that the noise is diffused and suppressed from leaking to the back side of the sound insulation panel. In addition, since the sound insulation panel has a simple structure of a front plate on the sound source side and a back plate on the back surface, it can maintain sound insulation for a long period of time, and is easy to manufacture and dispose of.

FIG. 3 is a perspective view of the sound insulation wall according to the first embodiment. It is explanatory drawing of the cross-section of the sound insulation panel of the sound insulation wall which concerns on Embodiment 1. FIG. 5 is an explanatory diagram of noise reflection of the sound insulation wall according to the first embodiment. FIG. 5 is an explanatory diagram of noise reflection of the sound insulation wall of the comparative example of the first embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts will be denoted by the same reference numerals, and the description thereof will be appropriately omitted or simplified. Further, regarding the configuration shown in each drawing, the shape, size, arrangement and the like can be appropriately changed within the scope of the present invention.

Embodiment 1.
FIG. 1 is a perspective view of a sound insulation wall 100 according to the first embodiment. The sound insulation wall 100 is installed upright on a roadside such as a highway or a railroad, and suppresses sound waves of noise generated from a vehicle traveling on a road or track from leaking to the outside.

  The sound insulation wall 100 is configured by mounting the sound insulation panel 10 between two columns 1. The pillar 1 is, for example, a steel material having an H-shaped cross section, and has a shape in which the web portion 3 is provided between the flange portions 2. The sound insulation panel 10 is inserted between the two flange portions 2 and attached to the 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 is configured by mounting a plurality of sound insulation panels 10 between two pillars 1. However, actually, a plurality of sound insulation walls 100 are continuously arranged along a highway or railroad track. It will be installed. In the first embodiment, the case where the sound insulation wall 100 is installed on the road side of the road will be described as an example.

(Front plate 20)
FIG. 2 is an explanatory diagram 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 formed by combining a front plate 20 forming a surface facing the road and a back plate 30 forming a surface facing the side opposite to the road. The front plate 20 includes a reflecting surface 23 between an upper end 21 which is one end and a lower end 22 which is the other end in the cross section. The upper end portion 21 and the lower end portion 22 are formed in a flat surface, and are fixed to the upper mounting portion 31 and the lower mounting portion 32 provided on the back plate 30. The front plate 20 and the rear plate 30 are fixed by, for example, blind rivets, but may be fixed by bolts or the like. The upper end portion 21 of the front plate 20 may be referred to as a front plate first end portion, and the lower end portion 22 of the front plate 20 may be referred to as a front plate second end portion. The upper mounting portion 31 and the lower mounting portion 32 of the back plate 30 may be referred to as front plate mounting portions.

  The upper end portion 21 of the front plate 20 is assembled so as to be folded back to the rear side at the upper end of the upper mounting portion 31 and to be mounted on the upper surface portion 36 of the rear plate 30. Further, the lower end portion 22 of the front plate 20 is folded back to the rear side at the lower end of the lower mounting portion 32 of the back plate 30, and is combined so as to hold the lower end of the lower mounting portion 32. A portion of the upper end portion of the sound insulation panel 10 where the front plate 20 and the rear plate 30 are combined is referred to as an upper folded portion 15. A portion of the lower end portion of the sound insulation panel 10 where the front plate 20 and the rear plate 30 are combined is referred to as a lower folded portion 16. With this configuration, in the sound insulation panel 10, the intrusion of rainwater or the like is suppressed at the upper end portion and the lower end portion, and the risk that the front plate 20 and the rear plate 30 are corroded in the hollow portions 13 and 14 is reduced. Further, in the front plate 20, since no opening is formed in the reflecting surface 23, invasion of water into the cavities 13 and 14 is suppressed.

  The reflecting surface 23 has a curved surface on the side facing the road, and is formed in 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 cylindrical surface whose central axis is located on the sound source side. The central portion 24 of the front plate 20 is in contact with the tip surface 34 of the protrusion 35 provided on the rear plate 30. The central portion 24 of the front plate 20 may be in contact with the tip end surface 34 of the protruding portion 35 and may be fixed by a fixing member such as a blind rivet or a fixing means such as welding. The reflecting surface 23 is a curved surface in which the surface of the front plate 20 is formed in an elliptic arc shape or other curve in the cross-sectional shape, in addition to the cylindrical surface in which the surface of the front plate 20 is formed in the arc shape. Is also good.

(Back plate 30)
The back plate 30 is formed by bending a steel plate. The upper end portion and the lower end portion of the back plate 30 are bent toward the front plate 20 and protrude, and an upper surface portion 36 and a lower surface portion 37 are formed. The upper surface portion 36 and the lower surface portion 37 form the upper end surface and the lower end surface of the sound insulation panel 10, and the upper surface portion 36 and the lower surface portion 37 face upward from the rear surface side so that the sound insulation panel 10 has a combination of shapes when stacked vertically. Is inclined to. Each of the upper surface portion 36 and the lower surface portion 37 has a flat surface facing the front plate 20 side at the tip thereof and serves as a front plate mounting portion. Since the front plate 20 is fixed to the front plate mounting portion of the rear plate 30, the front plate 20 can be made of a material having a small plate thickness, and the sound insulation panel 10 has a simple structure and is easy to manufacture. become. The upper end of the back plate 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 a back surface portion 38 that forms a back surface of the sound insulation panel 10. The back surface part 38 has a flat plate shape as a whole, but has a protruding part 35 facing the front plate 20 side at the center. The projecting portion 35 has two inclined surface portions 33 that are inclined and extended toward the front plate 20 side, a flat surface is formed at the tip of the inclined surface portion 33, and the central portion 24 of the front plate 20 contacts the surface. Touching. The contact portion between the central portion 24 of the front plate 20 and the protruding portion 35 of the rear plate 30 is preferably fixed by a blind rivet or the like. Since the front plate 20 is made of a thin steel plate, it has 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 projecting portion 35 of the rear plate 30, the central portion 24 of the front plate 20 having low rigidity is three-dimensionally molded and the projecting portion 35 of the rear plate 30 having high rigidity. Since they are integrated, it is possible to suppress the occurrence of vibration of the reflecting surface 23 of the front plate 20. If 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 can be set between 0.25 mm and 3.2 mm. For example, the front plate 20 may have a thickness of 0.6 mm, and the back plate 30 may have a thickness of 1.6 mm. As the material of the front plate 20 and the rear plate 30, it is preferable to apply a plated steel plate such as black ZAM (registered trademark) having a high surface design and excellent corrosion resistance. As the front plate 20 and the back plate 30, a plated steel plate having excellent corrosion resistance may be used instead of the ZAM steel plate.

  In addition, 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 rear plate provided with openings, and a sound absorbing member is provided inside. In this conventional sound insulation panel, aluminum is used as the material of the front plate and plated steel sheet 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 front plate 20 and the back plate 30 are made of the same material, the risk of corrosion due to contact with different 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 different kind of metal.

(Operation of sound insulation wall 100)
FIG. 3 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 roadside such as a road, and suppresses noise such as traveling noise of the vehicle 90 traveling on the road 91 and exhaust noise from leaking to the outside. That is, in FIG. 3, the sound insulation wall 100 has a function of making it difficult for sound waves from the road side to reach the region on the back 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 FIG. 2) extending downward is formed on the lower end portion of the sound insulation panel 10 on the side of the road 91, and is configured so as to close a gap between the upper and lower sound insulation panels 10.

  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 side. Each arrow shown in FIG. 3 schematically represents a sound wave of noise generated from the vehicle. The sound wave from the sound source P is diffused in all directions centering on the sound source P. The sound waves that have traveled to the sound insulation wall 100 side are reflected at the same angle as the incident angle at each point that hits the front plate 20 of each sound insulation panel 10 and is incident. For example, the sound waves reflected by the reflecting surface 23A of the sound insulation panel 10A arranged at the position closest to the surface of the road 91 are reflected so as to proceed toward the sound source P substantially as they are. These reflected sound waves are reflected by the surface of the road 91 or a vehicle traveling on the road, or hit the sound insulation wall 100 on the opposite side of the road, and are repeatedly reflected and gradually attenuated. Each sound insulation panel 10 reflects sound waves, and cavities 13 and 14 are formed in a space surrounded by the back plate 30 and the front plate 20. It is not necessary to install a filler such as a sound absorbing material in the cavities 13 and 14, and the sound insulation panel 10 has a simple structure and high durability.

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

  FIG. 4 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, 1100 are installed up to a position higher than a vehicle traveling on the road side of the road 91, for example, but the space above the normal road 91 is open. Therefore, the sound wave from the sound source P traveling to the side of the road 91 hits the sound insulation walls 100, 1100 and is reflected, so that the sound waves do not directly reach the area on the back side of the sound insulation walls 100, 1100. However, a sound wave that travels directly upward or obliquely upward from the sound source P leaks to the outside of the road 91 over the sound insulation walls 100, 1100. Therefore, it can be said that the sound insulation effect is low when there are many sound waves that go out of the road 91 over the sound insulation walls 100, 1100. This means that the sound insulation effect is low not only when the sound source P directly passes over the sound insulation wall 100, 1100 but also when there are many sound waves reflected and over the sound insulation wall 100, 1100.

  In the sound insulation wall 1100 according to the comparative example, since the reflected sound waves are reflected in substantially the same direction, noise easily leaks to the outside of the road beyond the sound insulation wall 1100 installed on the roadside. 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 almost at the same time.

  On the other hand, in the sound insulation wall 100 according to the first embodiment, the reflected sound waves are dispersed and reflected in each of the upper and lower directions according to the reflected position. Therefore, the amount of sound waves that leak above the sound insulation wall 100 to the outside of the road at the same time is smaller than that of the sound insulation wall 1100 of the comparative example. 3 and 4, only the sound waves emitted from the sound source P at one point are displayed, but in reality, noise may occur 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 sound source on the actual road 91, it can be said that the sound insulation wall 100 has less sound waves passing through the sound insulation wall 100 and outside the road 91 than the sound insulation wall 1100 according to the comparative example. In particular, since the reflecting surface 23 of the sound insulation panel 10 has a concave curved surface that is recessed from the road side, it does not project to the road side while reflecting and diffusing the sound wave as described above, so that the installation space is small.

  Although the present invention has been described above based on the embodiments, the present invention is not limited to the configurations of the above-described embodiments. For example, the reflecting surface 23 may have an elliptic arc, a parabola, a hyperbola, or a shape similar to them, in addition to an arc shape in cross section. Further, the sound insulation panel 10 is configured by a combination of the two components of the front plate 20 and the rear plate 30, but may be configured integrally or may be configured by combining more members. .. In short, it should be added that the scope of the present invention (technical scope) also includes various modifications, applications, and utilization ranges that are required by those skilled in the art.

  DESCRIPTION OF SYMBOLS 1 support | pillar, 2 flange part, 3 web part, 10 sound insulation panel, 10A sound insulation panel, 10B sound insulation panel, 10C sound insulation panel, 12 tab part, 13 cavity part, 14 cavity part, 15 upper folding part, 16 lower folding part, 20 Front plate, 21 upper end part, 22 lower end part, 23 reflective surface, 23A reflective surface, 23B reflective surface, 23C reflective surface, 24 central part, 30 back plate, 31 upper mounting part, 32 lower mounting part, 33 slanted surface part, 34 tip end surface, 35 protruding part, 36 upper surface part, 37 lower surface part, 38 rear surface part, 90 vehicle, 91 road, 100 sound insulation wall, 1100 sound insulation wall, P sound source.

Claims (8)

A front plate that constitutes one surface facing the sound source side,
The front plate is fixed, and a rear plate constituting a surface on the side opposite to the sound source side,
The front plate is
A front plate first end, which is one end in cross section, and a front plate second end, which is the other end, are fixed to the back plate,
A central portion between the front plate first end portion and the front plate second end portion is formed of a curved surface positioned closer to the back plate than the front plate first end portion and the front plate second end portion. Sound insulation panel with a reflective surface. The reflective surface is
The sound insulation panel according to claim 1, which is arc-shaped in cross section. The back plate is
Formed by bending a flat plate,
The back plate first end, which is one end in cross section, and the back plate second end, which is the other end in cross section,
The sound insulation panel according to claim 1 or 2, wherein the front panel mounting portion is formed by being bent toward the sound source side. The back plate is
A rear plate first end portion and a rear plate second end portion, and a protrusion toward the front plate side,
The central portion of the front plate,
The sound insulation panel according to claim 3, wherein the sound insulation panel is in contact with the tip of the protrusion. The central portion of the front plate,
The sound insulation panel according to claim 4, which is fixed to the protrusion.   A sound insulation wall configured by stacking a plurality of sound insulation panels according to any one of claims 1 to 5 in a vertical direction. The upper end surface and the lower end surface of the sound insulation panel are
The sound insulation wall according to claim 6, which is formed so as to be inclined downward from the front plate toward the back plate. The sound insulation panel,
The sound insulation wall according to claim 6 or 7, wherein a tab portion protruding downward is formed at an end portion of the lower end portion on the front plate side.

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