JP4016674B2 - Noise barrier panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is, for example railways, related to the FRP soundproof wall panels provided wayside freeway, details about the high soundproof wall panels of soundproofing effect.
[0002]
[Prior art]
Conventionally, the thing made from FRP is known as a sound-proof wall provided along a railway, a highway, etc. The soundproof wall is made of FRP, unlike conventional concrete and asbestos soundproof walls, so it has high strength and workability due to its light weight and high strength characteristics. There is also an advantage in that there is no problem of falling off or falling off from.
[0003]
[Problems to be solved by the invention]
However, the FRP noise barrier has many advantages over the conventional concrete noise barrier, such as light weight, high strength, design, and workability, but the panel transmission loss is governed by the weight law. For this reason, the FRP rails are lighter, so the transmission loss is lower than that of concrete, and therefore the soundproofing performance is a problem.
[0004]
The present invention has been made in view of the above problems, and an object thereof is soundproof performance you effectively proof sound noise coming propagating from the sound source to provide a high soundproof wall panels.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a soundproof wall panel of the present invention is a soundproof wall panel composed of a core material and a skin material made of fiber reinforced plastic located on both sides of the core material, the sound source side of the panel the surface that the sound entered from the outside panel and projections of order anti shines is provided, the material of the protruding Okoshibutsu are fiber-reinforced plastic of the same composition as the fiber reinforced plastic to form the skin material It is characterized by.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings of one embodiment.
[0008]
FIG. 1 is a perspective view showing a state in which a soundproof wall panel 2 of the present invention is attached to a viaduct 1 of a railway or a highway.
[0009]
In FIG. 1, a plurality of soundproof wall panels 2 of the present invention are fixed to both ends of the viaduct 1 in a line. That is, the soundproof wall panel 2 is fixed to both end portions 3 of the viaduct 1 with brackets 4 having an L-shaped cross section. An attachment hole 5 is provided on the lower surface of the bracket 4 to the viaduct lower surface so that it can be easily attached and detached by an appropriate fixing means such as an anchor bolt from the viaduct main body. It should be noted that the panel 2 in this figure does not show the protrusions 12 described later with reference to FIG.
[0010]
Here, as shown in FIG. 2, which is a cross-sectional view taken along the line AA of the panel 2 in FIG. 1, the soundproof wall panel 2 has a cross-sectional structure made of skin materials 6a and 6b on both sides with respect to the internal core material 7. It is made of a fiber-reinforced plastic having a skin-core structure, and the two skins are integrally connected by a plurality of ribs 9. Here, the pitch of the ribs 9 is determined by the strength required for the soundproof wall panel, the dimensions of the panel, the physical properties of the core material 7 and the like. For example, if the shear strength and compressive strength of the core material are high, There is no need to provide it. The skin materials 6a and 6b and the ribs 9 are made of, for example, fiber reinforced plastic (hereinafter referred to as FRP) using carbon fibers and glass fibers as reinforcing fibers and an unsaturated polyester resin as a matrix resin.
[0011]
As the matrix resin, a vinyl ester resin, an epoxy resin, a phenol resin, or the like can be used as long as it is a resin used for FRP, including an unsaturated polyester resin. When flame retardancy is required, a flame retardant such as aluminum hydroxide can be added, or a resin with a flame retardant component added in the molecule can be used. The core material 7 is a filler made of, for example, urethane foam. Further, between the ribs 9, a column body 8 made of iron or stainless steel is provided in the vertical direction (perpendicular to the paper surface of the drawing) to increase the strength against wind pressure and the like.
[0012]
Here, the reinforcing fibers used for the skin materials 6a and 6b are not particularly limited as long as they satisfy the rigidity required by the panel 2, but applications in which the lightness of the panel is important, for example, In the case where the strength of the frame of the elevated structure has deteriorated due to long-term use, it is preferable to use carbon fibers having high strength and rigidity with respect to weight. The core material 7 may be anything as long as it is light and sound-absorbing. For example, organic foams such as urethane foam and polyethylene foam, inorganic foams such as calcium silicate and foamed concrete, or wood Etc. can be used. Furthermore, it is also possible to shape the FRP panel into a hollow structure in advance and fill with some core material after the construction of the soundproof panel.
[0013]
The column body 8 does not need to be used in particular, but is preferably provided when it is necessary to contribute to joining with a frame structure or increasing the rigidity of the panel. The material of the column 8 is generally a metal, but a material made of FRP can also be used. In addition, 11a, 11b is a junction part with the adjacent panel 2, and has a level | step difference shape.
[0014]
As shown in the perspective view of FIG. 3, the soundproof wall panels 2 of the present invention, the protrusion 12 of the sound emitted from a sound source, such as railroad vehicles or automobiles you proof sound is fixed to the plurality horizontally Yes. In this embodiment, the protrusion 12 has a triangular cross section, and the tip 12a is directed in the direction of the sound source. Although there is no restriction | limiting in particular about the dimension of this projection part 12, For example, since it will become a hindrance of a maintenance etc. if it is too large as a rail for railroads or a highway, the height h of the projection is preferably 150 mm or less. In addition, the angle θ of the tip 12a is preferably attached in a direction that reflects sound propagating from below with respect to the panel, and specifically, within a range of 5 to 60 degrees. The mounting position of the protrusion 12 with respect to the entire panel is of course installed on the railway side of a railway noise barrier, but effectively prevents sound from escaping to the opposite side of the panel due to diffraction from the top of the panel. In order to do this, it is preferable to attach it above the panel. As the material of the protrusion 12, a fiber reinforced plastic having the same composition as the fiber reinforced plastic forming the skin material is used. As a method for attaching to the panel, any method such as adhesion, bolts, and screws may be used, but it is particularly preferable that the panel is integrally formed with the panel at the time of producing the panel.
[0015]
FIG. 4 is a cross-sectional view taken along the line B-B of the panel 2 in FIG. 3. In this example, the protrusion 12 is integrally formed with the panel.
[0016]
In Fig. 4, 6 Skin material made of FRP layer, 7 denotes a core material. The protrusion 12 is not attached as shown in this figure, and can be fixed to the upper portion of the panel 2 by changing the attachment position in a spiral shape, for example, as shown in the perspective view of FIG. In the case of trains, the main sources of noise are sounds generated from wheels and rails, or motor sounds, but by generating multiple reflections between the source and the train, sound sources from various directions are generated. It becomes. Therefore, the diffracted sound can be reduced more efficiently by providing a spiral as shown in the perspective view of FIG.
[0017]
FIG. 6 shows a specific example in which the protrusion 12 has a shape other than the triangular prism shape, and is a plate-like body 13 .
[0018]
Next, the manufacturing method of the panel for soundproof walls of this invention is demonstrated in order of a process.
[0019]
Although the description here shows an example of a manufacturing method in the case where the protrusion 12 is formed integrally with the FRP soundproof panel, the present invention is not limited to this.
[0020]
1. Mold preparation process A mold having a predetermined shape on the surface is manufactured in the following order.
[0021]
(1) First, make a wooden pattern that faithfully reproduces the finished shape of the FRP soundproof panel.
[0022]
(2) Next, FRP is laminated on the surface of the wooden mold, cured, and then removed from the wooden mold to obtain a molding die. The mold is subjected to a sufficient release treatment (usually a surface treatment is performed using wax or a fluorine-based chemical) on the surface. A gel coat is applied to the surface of the mold.
[0023]
2. Substrate (reinforced fiber fabric, core, etc.) preparation step Next, the reinforcing fiber fabric is cut into a predetermined size. In this case, it may be cut according to the size of the molded product in advance, but it may be cut while matching the size of the mold on the mold. Also, the core is cut in advance to the size specified in the design.
[0024]
3. Substrate Laminating Step A reinforcing fiber fabric is laminated on a mold coated with a gel coat. At this time, the type of reinforcing fiber to be used, the number of laminated layers, and the like are changed according to the required physical properties of the FRP soundproof panel. In some cases, both glass fiber fabric and carbon fiber fabric are laminated. The core material 7 cut into a predetermined size is arranged on the laminated reinforcing fibers in advance, and then the reinforcing fibers are laminated again to form a sandwich structure. A rib 9 can be formed by inserting reinforcing fibers between the cut cores.
[0025]
4). Molding process The layered product is covered with a film and connected to a vacuum pump to create a vacuum inside the film. Thereafter, the resin is introduced into the film and impregnated into the laminated reinforcing fiber fabric. When the resin has spread all over, the resin injection is stopped and the resin is allowed to cure under vacuum. After the resin is cured, it is demolded to form a molded product.
[0026]
【Example】
1 to 4, as a fiber reinforced plastic skin 6a, one glass fiber chopped strand mat, two glass fiber fabrics (fiber orientation angle: 0 ° / 90 °), One carbon fiber woven fabric (fiber orientation angle: 0 ° / 90 °) was laminated, then a 30-fold foamed hard polyurethane foam was placed as the core material 7, and hot galvanizing was applied as the column 8 Three pieces made of iron hollow squares (150 × 75 mm) were placed on a mold. The mold is preliminarily molded with a structure capable of preventing reflection as shown by the protrusion 12 in FIG. The cross section of the protrusion 12 is a triangle having a height of 50 mm and an apex angle of 45 degrees.
[0027]
A glass fiber fabric (fiber orientation angle: 0 ° + 45 ° / −45 °) serving as a fiber-reinforced plastic rib 9 is disposed between the core material 7 and the column body 8, and fiber reinforcement is also provided between the core materials 7. A glass fiber woven fabric (fiber orientation angle: 0 ° + 45 ° / −45 °) serving as the plastic rib 9 was arranged to provide a reinforcing structure for connecting the skins on both sides.
[0028]
Furthermore, as the fiber reinforced plastic skin 6b on the other side, one glass fiber chopped strand mat, two glass fiber fabrics (fiber orientation angle: 0 ° / 90 °), carbon fiber fabric (fiber orientation angle: 0 ° / 90) 1) was laminated.
[0029]
Next, the whole of the molding substrate is covered with a film and sealed, and the interior is evacuated, and the resin is injected to impregnate the unsaturated polyester resin as a matrix resin for the skins 6a and 6b and the ribs 9. Thus, the soundproof wall panel 2 was integrally formed. In addition, the hollow square member of the column 8 was disposed between appropriate ribs 9 so that the end portions were closed in advance and the resin was not allowed to flow into the hollow portion so that a predetermined interval was obtained.
[0030]
The soundproof wall panel 2 thus obtained has a height of 2.5 m, a width of 1 m, a column 8 protruding from the lower side of the panel as a connecting portion with the bracket 4, and a mounting hole 5 into which an anchor bolt is inserted. The bracket 4 was integrally connected.
[0031]
As shown in FIG. 1, the panel 2 shown in FIGS. 2 to 4 is attached to a viaduct 1 on which a train travels. As a comparative example, the panel 2 does not have a protrusion 12 at the bottom, that is, does not have a structure for reflecting sound. We compared the soundproofing performance with the panel. The comparison of the soundproofing performance is a position in which 25 m (continuous length) of the panel 2 of FIGS. 2 to 4 and the panel of the comparative example not provided with the protruding portion 12 are fixed and 10 m apart from each panel at a horizontal distance. For both panels, the noise was measured 10 times with a commercially available noise measuring instrument (manufacturer: Rion Co., Ltd., equipment name: precision sound level meter (with analyzer), model: NA-29E), and the average value was represented. Value.
[0032]
As a result, when the noise measurement value of the panel of the comparative example was 78 dB, that of the panel of the example was 73 dB, 5 dB lower than the comparative example of 78 dB, and it was confirmed that there was a soundproofing effect.
[0033]
【The invention's effect】
The soundproof wall panel of the present invention is a soundproof wall panel composed of a core material and a skin material made of fiber reinforced plastic located on both sides of the core material, and enters the sound source side surface of the panel from outside the panel. since the projection of the order a sound anti-shine that is provided, this projection is refers to the noise coming propagated from a sound source of a vehicle or the like for railway and automotive to soundproof wall downward anti increases the soundproofing effect.
[0034]
Further, in the method for manufacturing a soundproof wall panel according to the present invention, the shape of the projection reflecting the sound from the sound source is previously formed in the soundproof wall panel mold, and reinforcing fibers are arranged on the mold. By forming the soundproof wall panel in which the shape of the protrusion is substantially integrated with the panel, the panel can be easily manufactured with high productivity.
[Brief description of the drawings]
FIG. 1 is a partial perspective view showing an example of a mounting state of a soundproof wall according to the present invention.
FIG. 2 is a cross-sectional view of the soundproof wall of FIG.
FIG. 3 is a perspective view of the soundproof wall panel of FIG. 1;
4 is a cross-sectional view taken along the line BB of the soundproof wall panel of FIG. 3;
FIG. 5 is a perspective view of a soundproof wall panel according to the present invention having a protrusion of a mode different from the protrusion of FIG. 3;
6 is a perspective view of a soundproof wall panel according to the present invention having protrusions of a mode different from the protrusions of FIG. 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Viaduct 2 ... Noise barrier panel 4 ... Bracket 5 ... Mounting hole 6 ... Skin material 7 ... Core 8 ... Column body 12 ... Projection
13 ... Plate-shaped body

Claims (9)

Core and, a soundproof wall panel composed of a fiber-reinforced plastic skins located on both sides of the core, the sound source-side surface of the panel, the anti-shine because projections sound incident from the outside of the panel The soundproof wall panel is characterized in that the projection is made of a fiber reinforced plastic having the same composition as that of the fiber reinforced plastic forming the skin material . 2. The soundproof wall panel according to claim 1, wherein the protrusion is a column having a triangular section with the apex angle located on the sound source side, and the apex angle (θ) is within a range of 5 to 60 degrees. . The soundproof wall panel according to claim 1 , wherein the protrusions are plate-shaped . The soundproof wall panel according to any one of claims 1 to 3, wherein an attachment portion to a building frame is provided at a lower portion of the panel. 4. Symbol placement soundproof wall panels of the attachment portion is made of a metal. The soundproof wall panel according to any one of claims 1 to 5, wherein the reinforcing fiber of the fiber-reinforced plastic includes carbon fiber. The soundproof wall panel according to any one of claims 1 to 6, wherein a rib for connecting a skin material located on both sides of the core material is provided inside the panel. 7. Symbol mounting soundproof wall panels of the ribs is made of fiber-reinforced plastic of the same composition as the skin material. The soundproof wall panel according to any one of claims 1 to 8, wherein the matrix resin of the fiber reinforced plastic of the skin material is a flame retardant resin.

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