JP2006299789A - Transparent soundproof board and wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transparent soundproof material which is made of transparent films and prevents variations in its soundproof performance, and also is provided with highly transparent and seeing-through properties, and sounds insulation performance. <P>SOLUTION: This is a transparent soundproof board manufactured by piling up a transparent sound absorbing material 10 and a transparent sound insulation material 4 on a panel frame 3 with some distance kept between them. If the material 10 has a double-layered structure (of a porous board 11 and a first film material 21), it is made by laminating them in the way that the film material may be 98 to 99.9% and 100.1 to 101% in longitudinal and lateral sizes of those of the porous board, and loose allowance rates between them may be longitudinally -2 to -0.1% and laterally 0.1 to 1% respectively. The film material is cut in the size ratios of -2 to -0.1% and 0.1 to 1% to the porous board, and placed on top of the porous board with its four corners exactly adjusted and fixed to those of the porous board. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a soundproof plate and a soundproof wall having light-transmitting properties, see-through properties, and sound-absorbing properties used for noise countermeasures such as road railways.

  Conventionally, as a sound insulation board used for a sound insulation wall, a sound absorbing sound insulation board, polycarbonate, etc. in which a porous sound absorbing material such as glass wool is put in a metal frame, the sound source side is sound absorbing and the other side is made of a sound insulating board Translucent sound insulation board using transparent plastic is used, but sound absorbing sound insulation board has sound absorption and sound insulation properties, but there is a problem of obstructing sunlight and visibility because it has no light transmission and transparency. The translucent sound insulation board has translucency, transparency, and sound insulation, but has no sound absorption, so that there is a problem that the noise level increases due to reflection of sound on the sound source side.

  In order to solve the above problems, a light-transmitting sound-absorbing material (see Patent Document 1) obtained by laminating a transparent resin film and a porous plate made of aluminum expanded metal or the like, and a soundproofing combination of this and a light-transmitting sound-insulating material The present applicant has already proposed a panel (see Patent Document 2).

However, the sound absorption mechanism of a translucent sound absorbing material using such a transparent resin film is based on the vibration of the film material (film) itself and the friction between the film material and the perforated plate. It has been found that the sound-absorbing characteristics fluctuate depending on how the film-like material is stretched, particularly the degree of slackness.
JP-A-4-18697 and claims. Japanese Patent Application Laid-Open No. 2000-303412, claims.

  In view of the above-mentioned phenomenon, the present invention provides a translucent sound absorbing material that prevents fluctuations in the sound absorbing property of the translucent sound absorbing material using a transparent film-like material and obtains preferable sound absorbing characteristics. At the same time, the present invention intends to provide a soundproof plate having high translucency and transparency and having sound absorption and sound insulation. Furthermore, another object of the present invention is to provide a soundproof plate and a soundproof wall that can effectively improve the reduction in transparency due to light scattering by the constituent members without impairing the sound absorption property.

  In the translucent soundproof board in which the translucent sound absorbing material obtained by laminating the translucent film-like material and the translucent porous plate and the transparent sound insulating material are attached to the panel frame member with a space therebetween. The light-transmitting sound-absorbing material has a two-layer structure of one film-like material and one porous plate, and each of the longitudinal dimension and the lateral dimension of the film-like material with respect to the porous board, or any one of them. This can be solved by a translucent soundproof board characterized by being laminated with a slack allowance of -2 to -0.1% or 0.1 to 1%. When the slack allowance is positive, it means that the film-like material is laminated in a loose state, and when it is negative, it is laminated in a tensile state.

  In addition, the above problem is that the translucent soundproofing material in which the translucent sound absorbing material obtained by laminating the translucent film-like material and the translucent perforated plate and the transparent sound insulating material are attached to the panel frame member with a space therebetween. In the plate, the translucent sound-absorbing material has a three-layer structure in which one film-like material is sandwiched between two porous plates, and the slack margins of the vertical and horizontal dimensions of the film-like material with respect to the porous plate are This can be solved by the translucent soundproofing board of the present invention, which is laminated as -2 to -0.1% or 0.1 to 1%, respectively.

  Further, the above problem is that the light-transmitting sound-proofing material in which a light-transmitting sound absorbing material obtained by laminating a light-transmitting film material and a light-transmitting perforated plate and a transparent sound insulating material are attached to the panel frame member with a space therebetween. In the plate, the translucent sound absorbing material has a four-layer structure in which one first film-like material is sandwiched between two perforated plates, and one second film-like material is arranged on one side thereof. The slack allowance of each of the longitudinal dimension and the transverse dimension of the first membranous material with respect to the perforated plate is set to 0.1 to 3%, and the slack allowance of the longitudinal dimension and the transverse dimension of the second membranous material is respectively set. It is solved also by the translucent soundproof board of this invention characterized by being laminated | stacked as -2 to 1%.

  Furthermore, the above problem is that the translucent sound absorbing material obtained by laminating the translucent film-like material and the translucent perforated plate and the transparent sound insulating material are attached to the panel frame member with a space therebetween. In the soundproof plate, the translucent sound-absorbing material has a three-layer structure in which one porous plate is sandwiched between two film-like materials, and each of the film-like materials with respect to the porous plate or any one of the longitudinal layers thereof. Also by a translucent soundproofing board characterized by being laminated with a slack allowance of either or both of dimensions and lateral dimensions being -2 to -0.1% or 0.1 to 1% Solved.

Further, the improvement of the transparency is that the film-like material and the porous plate are made of a transparent material, and at least one of the porous plates is made of a colored transparent material such as a colored organic polymer material. It is solved by the translucent soundproof board of the invention.
In addition, the first perforated plate located on the front side (sound source side) of the soundproofing plate of the translucent sound absorbing material is a perforated plate made of a net-like material, and the second perforated plate located inside the soundproofing plate is a perforated plate of transparent material The translucent soundproof board of the present invention is preferably embodied in a configured form.
Then, a translucent sound-absorbing plate in which a translucent sound-absorbing material obtained by laminating a translucent film-like material and a translucent porous plate and a transparent sound-insulating material are attached to the panel frame member with a space therebetween are stacked. The soundproof wall of the present invention is characterized in that, in the soundproof wall installed on the automobile road, the light-transmitting soundproof plate using the colored transparent perforated plate is disposed at a location below the height of the passing vehicle. Solved and embodied.

  When the translucent sound absorbing material has a two-layer structure of one film material and one porous plate, and when the translucent sound absorbing material has a three-layer structure of one film material and two porous plates, a film Since the material was laminated with a predetermined slack allowance, as shown in the examples below, by causing film vibration of the film-like material due to incident sound waves and friction between the film-like material and the perforated plate appropriately, The sound absorption effect is exhibited, and a high sound absorption characteristic is obtained by a synergistic effect. Further, when the translucent sound absorbing material has a four-layer structure of two film materials, the first film material to be sandwiched is loosened from the second film material and laminated, and the second film material behind is the first film material. Since it is laminated more tightly than a film-like material, a higher sound absorption characteristic can be obtained in a wider range.

  Since the translucent soundproof board of the present invention has high sound absorption performance over a wide range of frequencies, when installed as a soundproof wall, reflection of noise can be sufficiently suppressed, so that the soundproofing effect can be enhanced. Moreover, since it also has translucency, transparency, and sound insulation, it has an appropriate sound insulation effect, and even if the soundproof wall is made high, the advantage that it does not impair the sunshine and visibility (permeability) can be utilized.

  Furthermore, in the translucent soundproof board of the present invention, since at least one of the perforated plates is made of a colored and transparent organic polymer material, the dazzling feeling of scattered light on the surface of the perforated plate and the periphery of the opening is reduced. As a result, the transparency is improved. In addition, the noise barrier for an automobile road disposed at a location below the height of the passing vehicle through the translucent soundproof plate has the advantage of improving safety and comfort because it reduces the driver's view. It is done.

In addition, if the transparent sound absorbing material porous plate on the front side after mounting on the translucent soundproof plate is a mesh or mesh material, and the inner porous plate is a transparent material perforated plate, the mesh material has a relatively large aperture ratio. The width of the slab is small, so even if dirt from automobile exhaust adheres to the opening edge (surface or inside) of the mesh material, the transparency and light transmittance of the entire sound absorbing material do not change, so the mesh material on the front side (porous plate) The dirt does not affect the translucency of the entire sound absorbing material. In the case of this configuration, the initial translucency is lower than that of the transparent sound-absorbing material in which two layers of transparent perforated plates are used, but since it is less affected by dirt, it is transparent in the long term using two layers of transparent perforated plates. It can be expected that translucency is maintained higher than that of the sound absorbing material.

  Thus, the translucent soundproof plate and the soundproof wall of the present invention provide a translucent sound-absorbing material that prevents fluctuation of the translucent sound-absorbing material using a transparent film-like material, and that provides favorable sound-absorbing characteristics. Therefore, it is possible to provide a soundproof board having a large light-transmitting property and see-through property and having sound absorption properties and sound insulation properties, and has an excellent effect that it can contribute to improvement of safety and comfort for the driver. Therefore, the technical value of the present invention is extremely great as a translucent soundproof board and soundproof wall which have solved the conventional problems.

Next, an embodiment according to the translucent soundproof board of the present invention will be described with reference to FIGS.
The translucent soundproof board 1 of the present invention is a translucent soundproof board in which a translucent sound absorbing material 10 and a transparent sound insulating material 4 are attached to the panel frame member 3 with a space as illustrated in FIG. The translucent sound-absorbing material 10 is divided into the two-layer structure shown in FIG. 1 (A) = [perforated plate 11 + first film material 21] and the three-layer structure shown in FIG. 2 (A). = [Perforated plate 11 + first membrane material 21 + porous plate 12], four-layer structure shown in FIG. 3A = [Perforated plate 11 + first membrane material 21 + porous plate 12 + second membrane material 22], FIG. There are four types of three-layer structure shown in (A) = [first film-like material 21 + porous plate 12 + second film-like material 22], but the constituent members are common and will be described together below.

(Film-like material constituting translucent sound absorbing material)
Translucent and transparent film-like materials 21 and 22 each having a porous plate disposed on both sides or one side, and the incident sound wave is used as vibration energy of the film-like material, and the film-like materials 21 and 22 It absorbs as frictional energy with the perforated plates 11 and 12. Examples of the film material include fluororesin films such as polyvinyl fluoride and polyfluoride ethylene, and synthetic resin films such as polyester, polypropylene, polyvinyl chloride, polyethylene, vinyl acetate, and polyvinylidene, and the thickness is 6 μm to 500 μm is preferred. Note that if the film-like material is too thick, film vibrations are less likely to occur and the sound absorption rate is lowered, and if it is too thin, it is likely to be damaged.

(Perforated plate constituting translucent sound absorbing material)
As the perforated plate, in addition to perforated type perforated plates 11 and 12 in which a plate material such as transparent or non-transparent polycarbonate or synthetic resin such as polyvinyl chloride is perforated, FIG. 1 (B) 11a, 12a, FIG. 2 (B) 11a, 12a, FIG. 3 (B) 11a, 12a, FIG. 4 (B) 11a, 12a, such as a net or expanded metal made of a metal material such as glass, ceramic, aluminum, or iron The net-like perforated plates 11a and 12a can also be used, and the material is not particularly limited. The net or net-like perforated plate is selected from colorless and transparent, colored and transparent, colorless and non-transparent or colored and non-transparent.

  The aperture ratio of the perforated plate is preferably 20 to 40% if it is a transparent material, and 40% or more if it is a non-transparent material, in order to ensure sound absorption, translucency, and transparency. Further, the size (diameter) of one opening (hole) is preferably 3 to 50 mm. From the perspective of transparency, a larger hole is preferable, but the above range is appropriate because the membrane vibration of the film-like material and the friction with the perforated plate become insufficient and the sound absorption rate also decreases.

In addition, a colored transparent plate such as an organic polymer material is used as a perforated plate of a transparent material for improving the transparency. The color and shade of the color can be selected from the color tone that matches the environment of the place of use such as black, gray, blue, green, brown, bronze, and sometimes from the viewpoint of preventing the collision of birds.
The reason why transparency is improved by such a colored transparent perforated plate is to visually reduce glare caused by diffused reflection of light on the perforated plate surface and the peripheral corners of the aperture (hole edge), which is the cause of reduced transparency. It seems to do.

The coloring concentration is preferably limited to a light color concentration that can ensure the light transmittance of the perforated plate that can see through the surroundings. When the total light transmittance is used as an index, it is preferable to maintain a total of at least 60% of the used porous plate and film-like material, although there is a slight difference depending on the color tone. Further, it is not necessary that all of the perforated plates constituting the sound absorbing material be colored plates, and it is preferable that the perforated plate located closest to the sound source side of the soundproof plate is colored and transparent, and the other perforated plates are colorless and transparent.
When combining a net or net-like perforated plate with a perforated type perforated plate, the net or net-like perforated plate is colored in a dark color such as gray or black (colored non-transparent). It is preferable to use a perforated plate made of a colorless and transparent material. By making the net or the net-like perforated plate a dark color such as gray or black, the visibility of the scenery behind is improved. Furthermore, if the net-like perforated plate is attached to the perforated soundproofing plate facing the sound source side (road side), dirt on the perforated plate due to automobile exhaust gas will not affect the translucency of the entire transparent sound absorbing material. it can.

(Combination of membrane material and perforated plate)
The combination of the membrane material and the perforated plate is a two-layer configuration (FIG. 1) by arranging one layer of the perforated plate on one side of the one layer of membrane material, or on both sides of the one layer of membrane material. A perforated plate is arranged to have a three-layer configuration (FIG. 2), or a second film material is arranged on the surface of the perforated plate to have a four-layer configuration (FIG. 3). Then, a film-like material is arranged on both sides, and a three-layer structure (FIG. 4) is laminated. In the present invention, the lamination of the film-like materials 21 and 22 and the perforated plates 11 and 12 means that the film-like materials are arranged in a proximity state in which friction occurs between them due to vibration of the film-like material (the same applies hereinafter). . In this case, in order to maintain the shape as a laminated panel, it is assumed that the outer peripheral portion and, if necessary, the intermediate portion are partially fixed with screws or the like.

(In the case of a two-layer structure or a three-layer structure)
The relationship between the size of the membrane material 21 and the porous plates 11, 12, 11 a, and 12 b shows that in the case of a two-layer structure, there is a large gap in the gap between the membrane material and the porous plate or the membrane material itself. In order not to be able to do so, two porous plates with a three-layer structure, and in the case of one film-like material, so as to prevent noticeable wrinkles in the film-like material sandwiched between two porous plates, and one porous plate with a three-layer structure In the case of two film-like materials, the vertical and horizontal dimensions of the film-like material are set to 98 to Lamination is performed with a size of 99.9% or 100.1 to 101% and a slack margin of −2 to −0.1% or 0.1 to 1%.

  For example, the membranous material is cut into a size of -2 to -0.1% or 0.1 to 1% of the size of the porous plate, and the four sides of the membranous material are arranged on the four sides of the porous plate. It can be manufactured by fixing and stacking according to the edges. Specifically, in this case, after providing a bonding portion such as a double-sided tape on the four-side end portion of the perforated plate, a method of bonding a film-like material is preferable. When the slack allowance is negative, it is preferable to take a dimension in consideration of a grip allowance when tension is applied to the film-like material.

  In the present invention, with such a configuration, the slack allowance is set within a certain range, so that fluctuations in sound absorption are suppressed and high sound absorption (see the examples described later) can be obtained over a wide range of frequencies. If the slack of the film-like material is excessive, wrinkles of the film-like material become large, resulting in non-uniform film vibration, and insufficient friction between the film-like material and the perforated plate. The frequency band for absorbing sound is narrowed, and the sound absorption is reduced. In addition, when the amount of wrinkles increases, the aesthetics deteriorate, and the visibility decreases due to irregular reflection of light rays.

  Further, if the film material is excessively stretched, a large tension acts on the film material, so that the vibration of the film material does not easily occur and the sound absorption due to the film vibration is reduced. Insufficient friction makes it difficult to obtain high sound absorption over a wide range of frequencies. Furthermore, when the film-like material is deformed (elongated) excessively, the strength of the film-like material itself may be deteriorated or the stability under severe outdoor conditions may be lacking.

  In the case of a three-layer structure with one perforated plate and two film materials, even if the slack margin of one film material is excessive, the effect on the sound absorption is small, but it affects the appearance, so other films It is preferable that the layers be laminated to the same extent as the material or to the extent that the appearance and visibility are not affected. From the viewpoint of sound absorption characteristics, if the difference between the slack margins of the two film-like materials is set so that one is on the minus side and the other is on the plus side within the above range, the low frequency side is shifted to the high frequency side. It is preferable because high sound absorption is obtained over a wide range of frequencies.

(4 layer structure)
In this case, the slack allowance is set large to some extent for the first film-like material 21 sandwiched between the two porous plates 11, 12, 11a, 12b. Each of the longitudinal dimension and the lateral dimension of the first membranous material 21 has a slack allowance of 0.1% to 3%, and the second membranous material has a slack allowance of −2 to 1%, respectively. Are laminated. In this case, a difference is provided such that the slack allowance of the second film-like material is the minus side and the first film-like material is the plus side, or the slack allowance of the second film-like material is smaller than that of the first film-like material. It is preferable to do.

Thus, by providing a large amount of slack in the first film-like material 21 sandwiched between the two perforated plates, the sound absorption coefficient on the low and medium frequency sides is improved, and at the same time, the second film-like material 22 disposed on one side is slack. By increasing the tension from a small amount, the sound absorption coefficient on the high frequency side is increased, and there is an advantage that a high sound absorption coefficient can be obtained over a wide frequency as a whole.
In addition, when the slack allowance of the first film-like material is excessive or too small, or when the slack allowance of the second film-like material is excessive or excessive, the sound absorbing performance is deteriorated. The appearance, visibility, and strength reduction are the same as described above.

The translucent sound-absorbing material 10, the transparent sound-insulating material 4, the panel frame material 3 and the like constituting the translucent soundproof plate 1 of the present invention will be described.
(Panel frame material)
The panel frame 3 may be made of a metal such as aluminum or iron, or a synthetic resin such as vinyl chloride, or an inorganic material such as ceramic or cement. The material is most preferred.

(Translucent sound insulation board)
The translucent sound insulating board 4 provided as the back plate of the translucent sound insulating board 1 is made of synthetic resin such as polycarbonate, vinyl chloride, methacrylic resin, styrene resin, ABS resin, fluorinated ethylene resin, acrylic resin, or rubber. Those having translucency and transparency, and those having translucency and transparency such as transparent and translucent glass are used singly or in multiple layers. The size is determined by the size of the soundproof board. The thickness is set from the required sound insulation force (sound transmission loss), but is preferably 3 to 10 mm in the case of a plastic plate when used for a road noise barrier.

(Internal sound absorbing material)
As shown in FIG. 6, it is preferable that internal sound-absorbing materials 51 and 52 are mounted inside the four-frame frame of the panel frame material 3 and along the intermediate frame material 31 inside the translucent soundproof plate 1. The present invention includes a configuration in which the internal sound absorbing materials 51 and 52 are not mounted as shown in FIG. The internal sound absorbing materials 51 and 52 are porous sound absorbing materials having communication holes or non-communication holes. For example, inorganic fiber aggregates such as glass wool and rock wool, metal fiber aggregates such as aluminum fibers, and aluminum foams. , Sintered body of aluminum particles, sintered body of ceramic particles, foams such as urethane and melamine resin, ceramic foam, sintered or bonded porous body of lightweight aggregate, cement foam, calcium silicate foam, etc. Is used.

  The porosity, flow resistance, air permeability, bulk specific gravity, size, thickness, presence or absence of a back air layer at the time of installation, sound absorption characteristics of the internal sound absorbing material itself can be selected as appropriate and are particularly limited. is not. Moreover, the arrangement | positioning inside the translucent soundproof board 1 puts along the side surface inner side of the panel frame material 3, puts it in the shape of a slit in the vertical or horizontal direction, what kind of shapes, such as a grid | lattice shape and a round hole shape, etc. Although it may be arranged in any shape, it is preferably arranged so that the see-through opening is 30% or more of the total area of the soundproof plate. When the opening that can be seen through is less than 30%, the permeability and transparency are inferior, and the utility as a translucent soundproof board is lost.

(Translucent soundproofing panel)
The soundproof plate 1 includes a light transmissive sound absorbing material 10, a panel frame material 3, sound absorbing materials 51 and 52 disposed inside, and a light transmissive sound insulating plate 4. These members are assembled to the panel using rivets, screws, adhesives, and the like. Then, an air layer is provided between the translucent sound absorbing material 10 and the sound insulating plate 4, and the entire thickness of the translucent sound insulating plate 1 may be set in accordance with the frequency of the sound source. If the thickness is made thinner, the sound absorption rate in the high frequency region is improved, and if it is made thicker, the sound absorption rate in the lower frequency region is improved. Generally, a thickness of 50 to 200 mm is appropriate.

  In addition, when assembling the translucent sound-absorbing material 10 to the panel frame member 3, which side of the sound-absorbing material is the front side, for example, the perforated plate side of the translucent sound-absorbing material having a two-layer structure is the front side (the perforated plate Can be used either on the sound source side and the membrane material on the inside of the panel) or on the front side (the membrane material is on the sound source side and the perforated plate is inside the panel). .

  For example, when the perforated plate is on the front side, the perforated plate also serves to protect the membrane material, but if the front side is subjected to antifouling treatment such as automobile exhaust gas, both the perforated plate and the membrane material need to be treated. However, when the film-like material is on the front side, there is no surface protection of the film-like material, but since the antifouling treatment only requires the film-like material, the processing cost is reduced, and dirt is deposited on the opening edge of the perforated plate. The problem disappears.

In order to reduce the effect on dirt, a transparent sound-absorbing material porous plate that becomes the front side (road side) when attached to a light-transmitting soundproof plate is replaced with a mesh or net-like material (colored non-transparent), and an inner porous plate. If a transparent material with a perforated plate is used, and the membrane material sandwiched between it is treated with a photocatalyst or the like to prevent contamination, the mesh material has a relatively large aperture ratio and a small mesh width, so that the exhaust gas from the automobile exhausts. Even if it adheres to the opening edge (surface or inside) of the (perforated plate), the net itself is not transparent, so there is almost no effect on the transparency and light transmittance, and the film-like material is also difficult to adhere to dirt. A certain translucency can be secured over a long period of time.
If the film-like material is not subjected to stain prevention treatment, a material such as a fluororesin film that does not easily adhere to the stain may be selected. Also, dirt can be removed by rain or washing with water.

  The three-layer structure composed of one perforated plate and two film-like materials is preferable from the viewpoint of antifouling treatment because the film-like material surface will be the front side regardless of which side is placed on the front side (sound source side). In addition, since two film-like materials are also arranged, there is an advantage that sound absorption can be secured with another film-like material even if one of the sheets in the table is broken.

In addition, it is preferable to stack both layers closely from the viewpoint of film vibration of the film-like material and sound absorption due to friction with the perforated plate, but as a method of close contact, the laminated light-transmitting sound-absorbing material is curved when assembled to the panel frame. It may be allowed to be assembled to the panel frame. For example, in the case of a two-layer structure of one film material and one perforated plate, it is preferable to bend so that the surface on the film material side of the perforated plate is a convex surface.

Further, it goes without saying that the translucent soundproof plate 1 of the present invention may be a curved surface.
Moreover, you may use for the translucent sound-insulation board 4 what gave the reinforcement by the weather resistance process with respect to an ultraviolet-ray etc., the process for surface hardness improvement, or a net | network. Further, the translucent sound absorbing material 10 may be subjected to a weather resistance treatment against ultraviolet rays or the like.
Further, a photocatalyst such as titanium dioxide may be attached to the front surface, back surface, and inside of the translucent soundproof plate 1 by coating or the like for preventing contamination or purifying nitrogen oxides.

  Further, as illustrated in FIG. 8, the translucent soundproof board 1 of the present invention is fitted to H-shaped steel members 61 and 61 erected on a concrete foundation 6 provided along a highway or the like that is a noise source, A soundproof wall is formed by stacking to form a wall surface. In this case, the upper and lower ends of the translucent soundproof plate 1 are provided with fitting portions 32a and 32b when the soundproof plates are stacked and installed, and holes (not shown) through which a wire rope for drop prevention is passed at both ends. May be.

  When the translucent soundproof plate 1 of the present invention is configured as a double-sided sound-absorbing soundproof plate, the cross-sectional member configuration of the translucent soundproof plate is made of translucent sound-absorbing material + air layer + translucent sound-insulating plate. A light-transmitting sound absorbing material is disposed on both surfaces, such as + air layer + light transmitting sound absorbing material.

  As shown in FIG. 8, when the translucent soundproof plates of the present invention are stacked and installed along a road for automobiles as a soundproof wall, the translucent soundproof plate using the above-described colored transparent perforated plate is used. It is appropriate to place it below the height of the passing vehicle. For this purpose, a translucent soundproof board using a colored transparent perforated plate is disposed substantially at a height of 2 m to 3 m or less from the road surface in the case of an elevated road and 3 m to 5 m or less in the case of a flat road. That's fine.

  Thus, for drivers traveling on the road, transparency (visibility) can be ensured, and from a soundproof plate made of a colorless transparent porous plate placed on the top of the soundproof wall, sufficient lighting and sunshine are secured. As a result, traffic safety and comfort can be improved, and convenience for use along the road increases.

Next, based on an Example, this invention is demonstrated in detail.
A transparent polycarbonate resin plate that has been perforated as a perforated plate, an aluminum expanded metal, and a translucent sound absorbing material that is an embodiment of the present invention laminated and laminated using a fluororesin film or the like as a film-like material A and R and translucent sound-absorbing materials a to l of comparative examples outside the range of the examples were prepared as shown in Tables 1 and 2. In the lamination, the four peripheral ends of the perforated plate and the four peripheral ends of the film were fixed with a double-sided tape, and the four sides of the laminated sound absorbing material were fixed with a transparent tape. The vertical and horizontal dimensions of the translucent sound absorbing material were about 900 mm × 1900 mm. The order of lamination was the first perforated plate, the first membranous material, the second perforated plate, and the second membranous material.

  The prepared translucent sound-absorbing materials A to R of the present invention, the translucent sound-absorbing materials a to l of the comparative example and the translucent sound-insulating material are assembled to the panel frame material, and the vertical and horizontal sizes are 1000 mm × 2000 mm and the thickness is about A 130 mm translucent soundproof board was prepared. The translucent sound absorbing material was attached so that the first porous plate shown in Table 1 or the first film-like material side was the sound source side (surface side of the soundproof plate). The translucent sound insulating plate was a 5 mm thick transparent polycarbonate plate, and the panel frame material was an aluminum material having a thickness of 2 mm. The light-transmitting sound-absorbing material was fixed with a pressing plate and fixed to the panel frame with rivets. The distance between the translucent sound absorbing material and the sound insulating plate was 90 mm.

  The sound absorption coefficient of the reverberation room method was measured for the translucent soundproof board produced as described above, and the results are shown in Table 3. According to the results in Table 3, it can be seen that the sound absorption coefficient of the light-transmitting soundproof plates A to R of the present invention has characteristics far superior to those of the comparative examples a to l which are outside the scope of the present invention.

Further, Tables 4 and 5 show the effect of improving the transparency when the colored transparent porous plate is used.
The table shows the characteristics of average sound absorption rate (reverberation room method sound absorption rate (JIS A 1409) average values of 250 Hz, 500 Hz, 1000 Hz, 2000 Hz), sound transmission loss (JIS A 1416), total light transmittance (JIS K 7361-1), and the visibility of the scenery behind when people looked at.
According to the results of Tables 4 and 5, among the examples of the present invention, in the case of No. 32 to No. 37 using the colored transparent porous plate, the visibility seen from the front, the visibility seen from the oblique 45 degree direction. It turns out that both are excellent. Even in this case, the sound absorption property and the sound transmission loss are not changed at all, and the light transmittance is slightly lowered, and there is no problem in practical use in this respect.

The development perspective view (A) (B) of the component member for demonstrating the translucent sound-absorbing material of the 2 layer structure of this invention. FIG. 4 is a developed perspective view (A) and (B) of constituent members for explaining a translucent sound absorbing material having a three-layer structure (two perforated plates and one film-like material) according to the present invention. The development perspective view (A) (B) of the component member for demonstrating the translucent sound-absorbing material of the 4 layer structure of this invention. FIG. 3 is an exploded perspective view of constituent members for explaining a light-transmitting sound absorbing material having a three-layer structure (one perforated plate and two film-like materials) according to the present invention. The front view (A) and side sectional view (B) which show the outline | summary of the translucent soundproof board of this invention. The principal part side sectional view which shows the translucent soundproof board of this invention. The principal part side sectional view which shows the translucent soundproof board of the other form of this invention. The partial perspective view which shows the soundproof wall which can apply this invention.

Explanation of symbols

1: translucent soundproof plate, 10: translucent sound absorbing material, 11: perforated plate, 11a: reticulated porous plate, 12: perforated plate, 12a: reticulated perforated plate 21: first film-like material, 22: second film Material 3: Panel frame material 4: Transparent sound insulation material

Claims (8)

  A translucent soundproof board in which a translucent sound absorbing material obtained by laminating a translucent film-like material and a translucent perforated plate and a transparent sound insulating material are attached to a panel frame member with a space therebetween, The sound absorbing material has a two-layer structure of one film-like material and one porous plate, and the slack allowance of each of the longitudinal dimension and the horizontal dimension of the film-like material with respect to the porous board or -2 A light-transmitting soundproof board characterized by being laminated as -0.1% or 0.1-1%.   A translucent soundproof board in which a translucent sound absorbing material obtained by laminating a translucent film-like material and a translucent perforated plate and a transparent sound insulating material are attached to a panel frame member with a space therebetween, The sound absorbing material has a three-layer structure in which one film-like material is sandwiched between two perforated plates, and the slack margins of the vertical dimension and the horizontal dimension of the film-like material with respect to the perforated board are -2 to -0. A light-transmitting soundproof board characterized by being laminated as 1% or 0.1 to 1%.   A translucent soundproof board in which a translucent sound absorbing material obtained by laminating a translucent film-like material and a translucent perforated plate and a transparent sound insulating material are attached to a panel frame member with a space therebetween, The sound absorbing material has a four-layer structure in which one first film-like material is sandwiched between two porous plates and one second film-like material is arranged on one side thereof. Laminations are made so that the slack allowance of each of the vertical and horizontal dimensions of the material is 0.1 to 3%, and the slack allowance of the second film-like material is 2 to 1%. A translucent soundproof board characterized by being made.   A translucent soundproof board in which a translucent sound absorbing material obtained by laminating a translucent film-like material and a translucent perforated plate and a transparent sound insulating material are attached to a panel frame member with a space therebetween, The sound-absorbing material has a three-layer structure in which one porous plate is sandwiched between two film-like materials, and each of the film-like materials with respect to the porous plate, or either one of the vertical dimension and the horizontal dimension, or A light-transmitting soundproof board, wherein either one of the slack margins is laminated at −2 to −0.1% or 0.1 to 1%.   The translucent soundproof board according to any one of claims 1 to 4, wherein the film material and the porous plate are made of a transparent material, and at least one of the porous plates is colored and transparent.   The translucent soundproof board according to claim 5, wherein the colored transparent porous board is formed of a colored organic polymer material.   The first perforated plate located on the front side (sound source side) of the soundproofing plate of the translucent sound absorbing material is composed of a perforated plate made of a net-like material, and the second perforated plate located inside the soundproofing plate is composed of a perforated plate of transparent material. The translucent soundproof board of Claim 2 or Claim 3. A light-transmitting sound-absorbing material in which a light-transmitting film-like material and a light-transmitting perforated plate are laminated, and a transparent sound-insulating material are attached to a panel frame member with a space therebetween, and stacked. 8. A soundproof wall installed on an automobile road, wherein the lightproof soundproof plate according to claim 5, 6 or 7 is disposed at a location below the height of the passing vehicle.

Images