JP2002138421A - Translucent sound absorption body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a translucent sound absorption body for effectively absorbing noise generated from a railway, a superhighway or the like and transmitting light. SOLUTION: The translucent sound absorption body is provided with a translucent panel member 2 for transmitting light, and a sound absorption body 3 projected on the upper end and/or the lower end of the translucent panel member 2 and absorbing the reflection sound of the translucent panel member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-transmitting sound absorber that effectively absorbs noise generated on railways, highways, and the like and does not block light.

[0002]

2. Description of the Related Art With the development of a highway network and a high-speed railway network as social capital development, reduction of traffic noise as a living environment along the road is required. One of the most effective countermeasures at present is to install sound-absorbing and sound-insulating walls.

Hitherto, for example, a glass fiber laminate has been widely used as the sound absorbing and insulating wall. In this case, various measures have been taken in order to prevent moisture from invading into the gaps between the fiber laminated molded articles due to rainfall or the like and to reduce the sound absorption coefficient of the fiber laminated molded articles. For example, in order to prevent infiltration of moisture, the surface of the fiber molded body is covered with a water-repellent film or the like, or glass wool or rock wool is put in a bag of a fluororesin film (eg, PVF, ETFE, etc.). Had been Also,
Measures have also been taken, such as storing the fiber laminate molded product in an aluminum box having an opening provided on the noise input surface side by punching, a louver, or the like. Furthermore, in recent years, a sound-absorbing material of an organic fiber laminated molded article which can prevent infiltration of moisture and has excellent sound-absorbing performance has been developed.

[0004]

However, since the conventional sound absorbing and insulating wall does not transmit light such as sunlight, the surrounding scenery is not known at all while traveling on a highway or the like, so that it is difficult to travel through a tunnel. There was a feeling of oppression like this. There was also a problem that private houses around the road complained about the right to sunshine.

On the other hand, when a light-transmitting plastic board is used for the sound-absorbing and sound-absorbing wall, the board has no sound-absorbing effect, so that vehicle noise reverberates on the road.
In some cases, the noise reduction effect was not obtained at the private houses as much as expected.

There have also been proposed some assembling structures of light-transmitting and sound-absorbing panels (for example, see Japanese Patent No. 306).
No. 9770), which is not always sufficient in terms of the sound absorbing effect.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light-transmitting sound absorber that effectively absorbs noise generated on railways, highways, and the like and does not block light.

[0008]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have combined a light-transmitting panel member that transmits light and a sound-absorbing material made of a fiber molding under specific conditions. As a result, they have found that the above object can be achieved, and have completed the present invention. That is, the present invention is as described below.

<1> A light-transmitting panel member that transmits light, and a sound-absorbing material projecting from an upper end and / or a lower end of the light-transmitting panel member and absorbing sound incident on the light-transmitting panel member. A light-transmitting sound absorber characterized by comprising:

<2> In the translucent sound absorbing body according to <1>, a light transmitting panel member is curved at an upper end portion and / or a lower end portion to form a curved portion, and the sound absorbing portion is formed in the curved portion. It is a translucent sound absorbing body in which materials are stored.

<3> In the translucent sound absorbing body according to <1>, a frame having a U-shaped cross section is formed below the opening at the upper end and / or lower end of the translucent panel member that transmits light. And / or a light-transmitting sound absorber in which the sound absorbing material is accommodated in the frame body.

<4> In the translucent sound absorbing body according to any one of <1> to <3>, a sound absorbing material is provided at one of an upper end and a lower end of the light transmitting panel member that transmits light. The other end is a light-transmitting sound absorber having an inclined portion for reflecting the sound incident on the light-transmitting panel member to the sound-absorbing material.

<5> The translucent sound absorber according to any one of <1> to <4>, which is used by being stacked in a plurality of stages.

<6> In the light-transmitting sound absorber according to any one of <1> to <5>, the light-transmitting panel member is a light-transmitting sound absorber made of polycarbonate or acrylic resin.

<7> The light-transmitting sound-absorbing material according to any one of <1> to <6>, wherein the sound-absorbing material is a light-transmitting sound-absorbing material having a core made of a fiber molded body made of polyester-based organic fiber. is there.

The translucent sound absorber of the present invention <1> to <6> can effectively absorb noise generated on railways, highways, and the like without blocking light such as sunlight. . Further, in the invention of the above <6>, an effect excellent in light transmission and weather resistance is exhibited. Further, in the invention of the above <7>, an effect particularly excellent in sound absorption is exhibited.

[0017]

Embodiments of the present invention will be described below. FIG. 1 shows a translucent sound absorber 1 according to one embodiment of the present invention. As shown in the drawing, the light transmitting type sound absorbing body 1 installed on the iron frame 5 forms a curved portion by bending the upper end portion and the lower end portion of the light transmitting panel member 2, and the sound absorbing material 3 is accommodated in the curved portion. Have been. The translucent panel member 2 is preferably a plastic board, particularly preferably translucent.
It is a board made of polycarbonate or acrylic resin because of its durability and weather resistance.

The volume of the sound-absorbing material 3 may be appropriately determined according to the application location of the light-transmitting sound-absorbing body 1. Accordingly, the sound absorbing material 3 is sufficiently protruded forward (in the direction of the sound source) so as to increase the volume of the curved portion in which the sound absorbing material 3 is stored, or to sufficiently absorb the sound incident on the light transmitting region 4. It should be done.

In the preferred embodiment shown in FIG. 1, the sound absorbing material 3 is provided on both upper and lower ends of the translucent panel member 2 in the same manner. For example, when the translucent sound absorbing body 1 is installed at a position slightly higher than the traveling position of the vehicle on a highway, the traveling noise of the vehicle is reflected by the light transmitting area 4 and then goes upward. It is sufficient to provide only at the upper end of the translucent panel member 2.

The type of the sound absorbing material 3 is not particularly limited, and a foam such as urethane foam or a fiber molded product may be used. The sound absorbing material 3 as a preferred example is formed by a protective material. A non-woven fabric made of an organic fiber can be suitably used as the protective material, which is made of a coated fiber molded body. Such organic fiber non-woven fabric,
Polyester, polypropylene, nylon, acrylic,
What consists of fibers, such as vinylidene chloride, can be used suitably. These organic fibers are hardly degraded even by ultraviolet rays or intrusion of water from the outside, and exhibit long-term outdoor sound absorption performance stably. From such a performance aspect,
Particularly preferred are polyester-based short fibers.

The center of the fineness distribution of the organic fiber nonwoven fabric is preferably 0.5 to 1 in terms of sound absorbing performance and cost.
It is 0 denier. The basis weight of the nonwoven fabric is preferably 50 to 500 g in order to obtain good sound absorbing performance.
/ M ² .

The organic fiber nonwoven fabric may be subjected to a water repellent treatment, a disaster prevention treatment, a salt prevention treatment, a weather resistance improvement treatment, etc. in accordance with a conventional method. Instead of the above-mentioned protective material, the entire surface of the fiber molded body may be directly subjected to a water-repellent treatment according to a conventional method. Alternatively, in the sound absorbing material 3 shown in FIG. 1, only the water-repellent treatment may be directly applied to the cross-sections at both ends, and the other surfaces may be entirely covered with the protective material.

[0023] The fiber molded article that can be used in the present invention is:
Preferably, the center of the fiber diameter distribution is 30 deniers or less.
More preferably 10 denier or less, even more preferably
Average apparent density using short fibers of 6 denier or less
0.01 to 0.15 g / cm ^Three, Preferably 0.01 to
0.10g / cm^Three, More preferably 0.02 to 0.0
7g / cm^ThreeOf the fiber assembly.
Uses short fibers of less than 30 denier and looks
By keeping the density within the specified range, ventilation inside the fiber molded body can be achieved.
The resistance can be increased and the sound absorption characteristics can be improved. Temporary
The same appearance when using more than 30 denier fiber
The density becomes coarse, the ventilation resistance does not increase,
The sound characteristics are inferior. On the other hand, this apparent density
If you try to improve sound absorption simply by increasing the
It becomes too easy to radiate sound, and on the contrary, soundproofing performance decreases
I do. From the above, the upper limit of the apparent density is 0.15 g
/ Cm^ThreeIt is preferable to set 3
Even when using fine fibers of 0 denier or less, the apparent density is
0.01 g / cm^ThreeIf it is smaller, the airflow resistance will increase.
The sound absorption performance cannot be expected, and the soundproofing performance is insufficient.
Minutes. As described above, the short fibers used are basically 30
Neil or less, and to achieve high sound absorption performance, 10
Use short fibers having a denier of 6 or less, preferably 6 denier or less.
It is desirable.

As the material of the short fibers, for example, in addition to synthetic fibers such as polyester, polypropylene, polyethylene, nylon and vinylon, natural fibers such as wool, cotton, hemp and metal fibers such as aluminum can also be used. . Furthermore, short fibers opened from a cloth using these fibers can also be used. In this case, a bituminous or similar material is made into a fiber by melt-spinning or other methods, and this is mixed with the above-mentioned short fiber by 10% by weight or more, or a molded article of a fiber aggregate used alone. A large sound absorbing effect can also be obtained by using.

Further, the fibrous molded article contains a binder and is preliminarily formed into a flat plate with an apparent density of 0.025 g / cm ^3.
A desired shape can be obtained by laying the following short fiber aggregate (preformed body) in a mold and subjecting it to heat compression molding so that the volume becomes 1/2 to 1/4.
As such a preform, a polyester fiber which is hardened with a binder such as polyethylene fiber, low melting point polyester fiber or bituminous fiber can be used. When a fiber molded article is obtained by compression molding this preform, if the compression ratio is less than 2, the air permeability becomes too large and the sound absorption is low, and if the compression ratio is more than 4, an overcompressed portion occurs,
For the reasons described above, the soundproof performance becomes insufficient. Therefore, the compression ratio is preferably from 2 to 4.

The fiber molded body can be obtained by the various molding methods described above. However, in order to perform more uniform filling and to reduce the density distribution, the fibers that have been opened and separated are separated into gas ( It is preferable to employ a method in which the air is blown into the mold together with the air, only this air is discharged from a large number of mesh holes, and only the short fibers are filled in the mold to form the mold. By such an air-conveying filling method, a free-form filling can be performed, and a uniform, soft, porous material can be obtained as a whole.

In order to solidify the thus obtained filler, a binder is required. As the binder, various materials such as a phenol resin that is heated and melted and solidified by reaction or a urethane-based adhesive that solidifies by reaction with steam are considered, but a binder having a fibrous form can be suitably used. . As such a fibrous binder, a polyester fiber having a low melting point which is melted by heating or steam, or a fiber of polyethylene or polypropylene which is melted by heating and solidified by cooling can be used. Desirably, the fiber material is composed of a low-melting component and a high-melting component, and a composite fiber in which the low-melting component is disposed outside the high-melting component, that is, the fiber surface, from the viewpoint of durability and acoustic performance. It is convenient. That is, if the conjugate fiber is heat-molded at a temperature higher than the melting point of the low-melting component and lower than the melting point of the high-melting component, the binder fibers can be bonded together by melting the low-melting component while maintaining a perfect fiber state. And sound performance can be secured.

In addition, other materials may be used as long as they are in the form of fibers, such as bituminous fibers, which are melted by heating or the like. As a molding method in which a fibrous binder is mixed, a method in which a mold temperature is adjusted to be equal to or lower than the melting point of the binder and the binder is melted by blowing hot air or steam at a temperature equal to or higher than the melting point to form a fibrous molded body. desirable. In this case, if a means for switching between hot air and cold air is added, the forming cycle can be further improved. Further, by blowing hot air or the like, uniform melting and hardening can be performed even inside the fiber molded body.

As described above, a short fiber as a raw material is blown into a mold together with a fibrous binder, and further, hot air is blown to melt the binder and bind the short fibers, thereby providing a soft, lightweight and desired shape. Can be obtained. By using such a fiber molded body, dimensional accuracy is high and sound insulation performance is excellent.

In order to join the sound absorbing material 3 formed by covering the fiber molded body with the protective material to the inner peripheral surface of the curved portion of the light transmitting panel member 2, any method such as heat fusion or use of an adhesive is used. However, a method based on heat fusion is preferable from the viewpoints of adhesiveness, economy, and the like.

FIG. 2 shows a translucent sound absorber 11 according to another embodiment of the present invention. As shown in the figure, in the light-transmitting type sound absorbing body 11, a sound absorbing material 13 is disposed at the upper end of the light transmitting panel member 12 as in the case of the above-described preferred embodiment, but the sound absorbing material 13 is provided at the lower end. Instead, an inclined portion 16 for reflecting the sound incident on the translucent panel member 12 to the sound absorbing material 13 is formed. When the angle θ of the inclined portion 16 is 45 °, the sound incident in the direction perpendicular to the translucent sound absorber 11 is reflected by the inclined portion 16 and can be absorbed by the sound absorbing material 13. The positional relationship between the sound absorbing material 13 and the inclined portion 16 may be reversed depending on the application location of the translucent sound absorbing body 11.

FIG. 3 shows a translucent sound absorbing body 21 according to still another embodiment of the present invention. As shown in the figure, the translucent sound absorbers 21 are used by being stacked in two stages, but the number of stacked stages is not limited to two, and may be determined as appropriate according to the application location.

At the upper end of each translucent panel member 22, a frame 27 having a U-shaped cross section is disposed with its opening facing downward, and the sound absorbing material 23 is accommodated in the frame 27. . In storing the sound absorbing material 23, the sound absorbing material 23 is not disposed over the entire volume of the frame 27, and as shown in FIG.
Good sound absorbing characteristics can be obtained even if an appropriate space is provided between the bottom surface of the sound absorbing material 23 and the side surface of the frame 27 and only the side surfaces of the sound absorbing material 23 are joined together by an adhesive or heat fusion. .

The means for joining the frame 27 to the translucent panel member 22 is not particularly limited, and examples thereof include bolting, heat fusion, and use of an adhesive. Examples of the material of the frame include plastics and metals such as aluminum, and aluminum is preferable from the viewpoint of weather resistance.

The sound absorbing material 2 is provided at the lower end of the light transmitting panel member 22.
3, the same as in the case of the above-described preferred example shown in FIG.
An inclined portion 26 for reflecting the sound incident on the light transmitting panel member 22 to the sound absorbing material 23 is formed.

When the translucent sound absorbing body of the present invention is installed on a highway, its width (W) is reduced to some extent as shown in FIG. 4, and even if it is damaged by a vehicle collision, only that part needs to be replaced. It is preferable to do so. Specifically, the width (W) is about 50 cm, and the translucent sound absorbers are joined to each other by means such as heat fusion.

[0037]

As described above, according to the translucent sound absorbing body of the present invention, it is possible to effectively absorb noise generated on railways, highways, and the like, and to transmit light. It is possible to avoid problems such as sunshine and driver stress.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a translucent sound absorbing body according to one embodiment of the present invention.

FIG. 2 is a cross-sectional perspective view of a translucent sound absorbing body according to another embodiment of the present invention.

FIG. 3 is a cross-sectional perspective view of a translucent sound absorber according to still another embodiment of the present invention.

FIG. 4 is a front view showing an arrangement state of the translucent sound absorbing body shown in FIG.

[Explanation of symbols]

 1,11,21 translucent sound absorber 2,12,22 translucent panel member 3,13,23 sound absorbing material 4 light transmissive area 5 iron frame 16,26 inclined portion 27 frame

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) G10K 11/162 G10K 11/16 D 11/16

Claims (7)

[Claims] 1. A light-transmitting panel member that transmits light, and protrudingly provided at an upper end and / or a lower end of the light-transmitting panel member,
A sound-absorbing material for absorbing sound incident on the light-transmitting panel member. 2. The light transmitting device according to claim 1, wherein an upper end and / or a lower end of the light transmitting panel member that transmits light is curved to form a curved portion, and the sound absorbing material is accommodated in the curved portion. Type sound absorber. 3. A frame having a U-shaped cross section is disposed at an upper end and / or a lower end of a translucent panel member that transmits light with its opening directed downward and / or upward. The light-transmitting sound absorber according to claim 1, wherein the sound absorbing material is housed in the housing. 4. A sound-absorbing material is provided at one of an upper end and a lower end of a light-transmitting panel member that transmits light.
The translucent sound absorber according to any one of claims 1 to 3, wherein the other end has an inclined portion for reflecting the sound incident on the translucent panel member to the sound absorbing material. 5. The light-transmitting sound absorber according to claim 1, wherein the light-transmitting sound absorber is used by being stacked in a plurality of stages. 6. The translucent sound absorber according to claim 1, wherein the translucent panel member is made of polycarbonate or acrylic resin. 7. The light-transmitting sound absorber according to claim 1, wherein the sound absorber has a core made of a fiber molded body made of polyester-based organic fibers.