JP2000087318A - Sound absorbing member and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound-absorptive member which has a high durability and which does not destroy the surrounding environment by compressing and filling lumps of synthetic fiber formed by entangling the fiber into an outer shell constituted of a porous plate. SOLUTION: This sound-absorbing member 1A is constituted of a surface plate 11A formed of a porous plate such as a metallic plate or the like having a number of pores and provided with a bulged part extended outward along the longitudinal direction of an elevated bridge, a sound-absorbing material 12 in which synthetic resin fiber formed by entrangling the fiber is compressed and filled, synthetic resin film 13, and a rear face plate 14A. The synthetic resin fiber constituting the sound-absorbing material 12 is formed by entangling thick polyvinylidene chloride fiber having a high water resistance against rainwater or the like and a high chemicals-resistance against exhaust gas or the like and thin polyester fiber. Hence, the entangled synthetic resin fiber constituting lumps of the synthetic resin fiber brings out a sound absorbing action and there is no fear that glasswool is scattered to cause environmental destruction. This material can be easily and inexpensively manufactured and easily pigmented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound-absorbing device provided below a sound-insulating wall, a viaduct of an elevated viaduct, an elevated railway or the like (in this specification, sometimes referred to simply as "viaduct"). The present invention relates to a sound-absorbing member used for the above.

[0002]

2. Description of the Related Art With the increase in traffic volume and the size of vehicles, measures against traffic noise are strongly demanded, and in order to cope with this, soundproof walls provided with various sound absorbing members have been put to practical use. FIG. 11 shows a cross-sectional structure of a sound absorbing member used for a sound insulation wall most commonly used at present. The sound absorbing member 101 has a surface plate 111 made of a metal plate material having a louver structure subjected to rust prevention treatment, and a synthetic resin film 112
a sound-absorbing material 112 made of glass wool covered with a, a back plate 114 made of a rust-proof treated metal plate material provided with a space 115 behind the sound-absorbing member 112, and a space 115
Frame member 11 made of a metal plate material treated to prevent rust
The sound-absorbing member 101 comprises a sound-absorbing member 101 composed of a unit block consisting of 3 and inserted into and fixed to a post made of rust-proofed H-shaped steel or the like, or directly fixed to a side wall made of concrete. I like to build.

[0003]

By the way, the soundproof wall is
The vehicle is exposed to extremely poor environments such as exhaust gas emitted by the vehicle, vibrations from the vehicle, rainwater, etc., and in some cases, is washed by a washing vehicle equipped with brushes and high-pressure water nozzles. Required. Also, in order to harmonize with the surrounding environment, it is necessary to consider the soundproof wall in terms of colors and the like. However, as shown in FIG. 11, a conventional sound absorbing member 101 used for a soundproof wall is made of a glass wool whose surface is covered with a synthetic resin film 112a and which is formed into a block shape by curing a resin binder into a block shape.
Is disposed so as to be in direct contact with the back surface of the front plate 111, so that the synthetic resin film 112a deteriorates due to long-term use, and a large load acts upon vibration by the traveling vehicle or during cleaning. If the glass wool is left as it is for a long period of time, the glass wool scatters, causing a problem of environmental destruction and eventually pollution.

[0004] Further, a sound absorbing material 1 made of this glass wool.
No. 2 has a problem in that the manufacturing cost of the sound absorbing member 101 including the molding cost increases as the shape of the sound absorbing member 101 becomes more complicated because it is necessary to form the sound absorbing member 101 using a mold according to the shape of the sound absorbing member 101. Was.

Further, a sound absorbing material 11 made of glass wool
2 is difficult to color, and when a metal plate material having a large number of openings such as an expanded metal or a punched metal is used for the surface plate, the openings are colored in harmony with the surrounding environment. It was difficult.

The present invention solves the above-mentioned problems of the sound absorbing member used for the conventional soundproof wall, has high durability,
Provided is a sound absorbing member that can be easily and inexpensively manufactured regardless of the shape of the sound absorbing member without destroying the surrounding environment and that can be colored in harmony with the surrounding environment. The first purpose is to do so.

It is a second object of the present invention to provide a method of manufacturing a sound absorbing member that can easily assemble such a sound absorbing member at a construction site or the like.

[0008]

In order to achieve the first object, a sound-absorbing member of the present invention comprises a synthetic fiber formed by entanglement of a synthetic fiber inside an outer shell constituted by a porous plate. The lumps are compressed and filled.

This sound-absorbing member is obtained by simply entanglement of a synthetic fiber inside a shell constituted by a porous plate without using a molding die as in a conventional sound-absorbing material made of glass wool. Since the formed synthetic fiber mass is compressed and filled, the entangled synthetic fibers constituting the synthetic fiber mass play an effective sound absorbing effect, and glass wool, like a conventional sound absorbing material made of glass wool, The sound absorbing member can be easily and inexpensively manufactured irrespective of the shape of the sound absorbing member without being scattered and causing environmental destruction, and can be easily colored.

In this case, the synthetic fiber mass can be formed by entanglement a plurality of types of synthetic fibers having different fiber diameters, and in particular, synthetic fibers 60 to 8 having a denier of 20 to 40.
It is desirable to form by entangling 0% by weight and 40 to 20% by weight of 2 to 5 denier synthetic fiber.

As a result, a plurality of types of synthetic fibers having different fiber diameters constituting the synthetic fiber mass have an effective sound absorbing effect on noise in a wide frequency range, and the sound absorbing performance of the sound absorbing member. Can be improved.

The synthetic fiber mass can be formed by entanglement of a large-diameter polyvinylidene chloride fiber and a small-diameter polyester fiber.

As a result, it is possible to obtain a synthetic fiber mass having high water resistance against rainwater and the like and chemical resistance against exhaust gas and the like, and it is possible to improve the durability of the sound absorbing member.

Further, the surface of the synthetic fiber mass can be covered with a synthetic resin film.

[0015] This makes it possible to obtain a synthetic fiber lump that is hard to lose its shape, to eliminate restrictions on the shape of the opening of the porous plate constituting the outer shell, to be resistant to rainwater and the like, and to exhaust gas and the like. A synthetic fiber mass having high chemical properties can be obtained, and the durability of the sound absorbing member can be improved.

Further, a synthetic fiber nonwoven fabric mat having an uneven surface can be provided on the outermost layer of the synthetic fiber mass.

[0017] This makes it possible to obtain a synthetic fiber lump that is hard to lose its shape, to eliminate restrictions on the shape of the opening of the porous plate that constitutes the outer shell, and to prevent the synthetic fiber nonwoven fabric mat from being externally washed or the like. By performing a protective action against a load, the durability of the sound absorbing member can be improved. In addition, a sound absorbing effect can be expected at the boundary surface between the synthetic fiber nonwoven fabric mat and the synthetic resin film covering the surface of the synthetic fiber mass, and the sound absorbing performance of the sound absorbing member can be improved.

In order to achieve the second object, the method for producing a sound-absorbing member according to the present invention comprises compressing and filling a synthetic fiber mass formed by entanglement of synthetic fibers in a temporary frame. A synthetic fiber mass formed by entanglement of synthetic fibers inside the outer shell made of a porous plate by inserting it into the outer shell of the sound absorbing member made of a porous plate and removing the temporary frame. Is compressed and filled.

In the method of manufacturing the sound absorbing member, the synthetic fiber mass formed by entanglement of the synthetic fiber in the temporary frame is compressed and filled, and the compressed and filled synthetic fiber mass is formed inside the outer shell of the sound absorbing member constituted by a porous plate. By removing the temporary frame, the sound absorbing member is manufactured, so that the sound absorbing member can be easily assembled at a construction site, etc., and compared with the case of transporting the completed sound absorbing member. The labor required for transportation can be reduced, and the cost can be reduced.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a sound absorbing member and a method of manufacturing the same according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the sound absorbing member of the present invention. For example, as shown in FIG. 1, this sound absorbing member 1 is provided with a space 3 in front of a side wall 2 made of concrete or the like to form a soundproof wall. When disposed on the front surface of the side wall 2, although not particularly limited, the frame member 15 of the sound absorbing member 1 is fixed to the angle iron 41 fixed vertically to the side wall 2 with an anchor bolt or the like via a fixing bracket 42. Are fixed by bolts, and the sound absorbing members 1 are sequentially stacked up to a predetermined height. In addition, the sound absorbing member 1 may be inserted and fixed to a post made of rust-proof H-shaped steel or the like, or may be fixed directly to a side wall made of concrete to form a sound insulating wall.

As shown in FIG. 2, the sound absorbing member 1 is made of a very large number of fine metal plates, such as aluminum, rust-proof expanded metal, punched metal, louvered structures, etc. Surface plate 1 composed of a porous plate such as a metal plate having holes
1, a sound absorbing material 12 formed by compressing and filling a synthetic fiber mass formed by entanglement of synthetic fibers, a synthetic resin film 13 covering the surface of the sound absorbing material 12, and a back plate 14 made of a non-porous metal plate. And a unit block whose periphery is covered with a frame member 15 made of a metal plate material subjected to a rust-proofing process.

The synthetic fibers constituting the sound absorbing material 12 include a large-diameter polyvinylidene chloride fiber and a small-diameter polyester fiber having high water resistance against rainwater and the like and chemical resistance against exhaust gas and the like. Entangled, preferably 10 to 100 denier, more preferably 20 to 100 denier
40 denier polyvinylidene chloride fiber was added to 50-98
% By weight, more preferably 60 to 80% by weight,
10 denier, more preferably, 2 to 5 denier polyester fiber is entangled with 50 to 2% by weight, more preferably 40 to 20% by weight.

As described above, by compressing and filling a synthetic fiber mass formed by entanglement without solidifying the synthetic fibers constituting the sound absorbing material 12, a plurality of types of synthetic fibers having different entangled fiber diameters can be formed. In addition, the entangled synthetic fibers exhibit an effective sound absorbing effect, and unlike conventional sound absorbing materials made of glass wool, glass wool does not scatter and cause environmental destruction. And can be manufactured at low cost.
2 can be easily colored. In particular, the sound absorbing material 12
The synthetic fibers of various types having different fiber diameters exhibit effective sound absorbing action against noise in a wide frequency range, and the sound absorbing performance of the sound absorbing member 12 can be improved.

In this embodiment, the surface of the sound absorbing material 12 is covered with a synthetic resin film 13 such as polyvinyl fluoride to prevent the sound absorbing material 12 from being deformed and to restrict the shape of the opening of the surface plate 11. And water resistance against rainwater and the like, and chemical resistance against exhaust gas and the like to improve the durability of the sound absorbing member.
When 1 is made of a metal plate material having an extremely large number of fine holes, such as an aluminum fiber plate, the synthetic resin film 13 can be omitted.

In this embodiment, the internal space of the sound absorbing member 1 is constituted by one space. However, for example, a metal plate material having a large number of openings, such as an expanded metal or a punched metal, or a non-porous metal. The internal space of the sound absorbing member 1 can be constituted by a plurality of spaces by, for example, vertically dividing the internal space of the sound absorbing member 1 by a partition plate (not shown) made of a plate material. The bias of the compressed and filled sound absorbing material 12 can be prevented.

FIG. 3 shows a modification of the first embodiment of the sound absorbing member of the present invention. In this sound absorbing member 1, a synthetic fiber nonwoven fabric mat 16 having an uneven surface is provided between a surface plate 11 of the sound absorbing member 1 shown in FIG. 1 and a sound absorbing material 12 covered with a synthetic resin film 13. It is structured to be.

As shown in FIG. 4, the synthetic fiber nonwoven fabric mat 16 is made of synthetic resin fibers having weather resistance, for example,
A porosity of 70 to 40 denier is obtained by entanglement of polyvinylidene chloride fibers of 0 to 40 deniers and binding them together with a bridging agent made of a synthetic resin material having appropriate weather resistance.
It is formed in a mat shape having a flexibility of 95% and a thickness of 2 to 5 mm. In this case, at the time of heat molding, a large number of protrusions 16 a are formed on at least the side facing the synthetic resin film 13 covering the sound absorbing material 12. Specifically, it is desirable to form a protrusion of about 3 to 10 mm. The protrusion 16a
Is not limited to the circular protruding portion of the present embodiment, and the shape, height, and the like can be arbitrarily set, for example, by forming a strip in a vertical or horizontal direction.

By disposing the synthetic fiber non-woven fabric mat 16, the sound absorbing material 12 is prevented from being deformed, the shape of the opening of the surface plate 11 is not restricted, and the synthetic fiber non-woven fabric mat is protected from outside by washing or the like. And the durability of the sound absorbing member 1 can be improved. The synthetic fiber nonwoven fabric mat 16 and the sound absorbing material 12
The sound absorbing effect at the boundary surface of the synthetic resin film 13 covering the surface can be expected, and the sound absorbing performance of the sound absorbing member 1 can be improved. By arranging the synthetic fiber nonwoven fabric mat 16, the synthetic resin film 13 can be omitted.

The remaining structure and operation of the sound absorbing member 1 of this modification are the same as those of the sound absorbing member 1 of the first embodiment.

By the way, the sound absorbing member of the present invention can be used for the sound absorbing device provided below the viaduct floor slab, which the present inventors have previously proposed, in addition to the above soundproof wall.

As shown in FIGS. 5 and 6, this sound absorbing device 7 shields substantially the entire lower surface of the floor slab 51 so as to form a predetermined working space 6 below the floor slab 51 of the viaduct 5. It is provided as follows. The sound absorbing device 7 also serves as a permanent scaffolding that is permanently installed so that the worker enters the work space 6 to repair the lower surface of the floor slab 51 or to perform repair work such as painting steel materials used for the bridge girders 52. It is provided so as to cover substantially the entire lower surface of the floor slab 51 so that there is no gap for work materials such as paint, reinforcing steel, concrete and the like and work tools to fall on the lower road 8 during repair work. This eliminates the need to assemble a scaffold each time repair work is performed, as is the case with conventional temporary scaffolds. This improves safety, improves the work environment for repair work, and improves work efficiency. Can be
In addition, at the time of repair work, work materials such as paint, reinforcing steel, concrete, work tools, etc. do not fall, and therefore, vehicles and the like traveling on the lower road 8 are not damaged. Can be reduced. The height H of the working space 6 is set to a height at which the repair work such as the repair of the lower surface of the floor slab 51 or the painting of the steel material used for the bridge girder 52 can be easily performed, for example, about 1 to 2 m. It is desirable to set.

The sound absorbing device 7 includes an erecting member 72 made of H-shaped steel disposed on the bridge girder 52 of the viaduct 5, and the erecting member 72
And a sound absorbing member 1A fixed via a fixing member 73.

FIG. 7 shows a second embodiment of the sound absorbing member of the present invention applied to the sound absorbing device 7 provided below the floor slab 51 of the viaduct 5. This sound absorbing member 1A is made of expanded metal, punched metal,
A metal plate having a large number of openings, such as a louver structure, or a porous plate, such as a metal plate having an extremely large number of micropores, such as an aluminum fiber plate, extending outward in the longitudinal direction of the viaduct 5. A surface plate 11A having a swollen portion protruding in a strip shape, a sound absorbing material 12 formed by compressing and filling a synthetic fiber mass formed by entanglement of synthetic fibers, and a synthetic resin film 13 covering the surface of the sound absorbing material 12. A back plate 14A also serving as a scaffold plate having a large number of openings made of aluminum,
The front plate 11A is fixed to a frame member 15A integrally formed by extrusion molding with the rear plate 14A.

Among them, the synthetic fiber constituting the sound absorbing material 12 has a large-diameter polychloride having high water resistance against rainwater and the like and chemical substance resistance against exhaust gas and the like, similarly to the sound absorbing member 1 of the first embodiment. Preferably, 10 to 100 denier, more preferably, 20 to 40 denier polyvinylidene chloride fiber is entangled with vilinidene fiber and small-diameter polyester fiber, and 50 to 98% by weight, more preferably, , 60 to 80% by weight and 1 to 10 denier, more preferably 2 to 5 denier polyester fiber,
50 to 2% by weight, more preferably 40 to 20% by weight
And the sound absorbing member 1A of the present embodiment.
The other configuration and operation are the same as those of the sound absorbing member 1 of the first embodiment.

As shown in FIG. 8, this sound absorbing member 1A is compressed and filled with a synthetic fiber mass formed by entanglement of synthetic fibers in a temporary frame 11C in a manufacturing plant.
At a construction site or the like, the front plate 11A, the back plate 1
By inserting the temporary frame 11C into the outer shell of the sound absorbing member 1A constituted by the 4A and the frame member 15A, for example, by pulling out the temporary frame 11C, the synthetic fiber is entangled inside the outer shell of the sound absorbing member 1A. Compressed synthetic fiber mass,
The sound absorbing member 1A can be assembled by filling.

As a result, the sound absorbing member 1A can be easily assembled at a construction site or the like, and the labor required for transporting the materials is reduced as compared with the case where the completed sound absorbing member 1A is transported, thereby reducing the cost. be able to.

FIG. 9 shows a first modification of the second embodiment of the sound absorbing member of the present invention. The sound-absorbing member 1 is formed by entanglement of a synthetic resin fiber with a sound-absorbing material 12a immediately below a back plate 14A of the sound-absorbing member 1A shown in FIG. 7 and using a bridging agent made of a synthetic resin material having appropriate weather resistance. , And is formed using a block-shaped member.

As the bridging agent, besides ordinary resins, fibers having a lower melting point than polyvinylidene chloride fibers such as polyester fibers can be used. In this case, together with polyvinylidene chloride fibers, polyvinylidene chloride fibers such as polyester fibers can be used. By tying the low-melting fibers and heating the whole to melt the low-melting fibers, the polyvinylidene chloride fibers can be bonded together, and are homogeneous and
It is possible to obtain a synthetic fiber mass that is difficult to lose shape, especially,
Polyvinylidene chloride fibers having a denier of 10 to 100, and fibers having a lower melting point than polyvinylidene chloride fibers such as polyester fibers used for a bridging agent, and fibers having a denier of 1 to 10 denier are used. Uses 98-60% by weight of polyvinylidene chloride fiber and 2-40% by weight of low melting point fiber,
By tying the two together and melting the low-melting fiber to bind the polyvinylidene chloride fiber, a more homogeneous synthetic fiber mass can be obtained.

The other structure and operation of the sound absorbing member 1A of this modification are the same as those of the sound absorbing member 1A of the second embodiment.

FIG. 10 shows a second modification of the second embodiment of the sound absorbing member of the present invention. This sound absorbing member 1A is made of a synthetic fiber nonwoven fabric mat having an uneven surface between a front plate 11A and a back plate 14A of the sound absorbing member 1A shown in FIG. 16 are arranged and configured.

As shown in FIG. 4, the synthetic fiber nonwoven fabric mat 16 is made of synthetic resin fiber having weather resistance, for example, 2
A porosity of 70 to 40 denier is obtained by entanglement of polyvinylidene chloride fibers of 0 to 40 deniers and binding them together with a bridging agent made of a synthetic resin material having appropriate weather resistance.
It is formed in a mat shape having a flexibility of 95% and a thickness of 2 to 5 mm. In this case, at the time of heat molding, a large number of protrusions 16 a are formed on at least the side facing the synthetic resin film 13 covering the sound absorbing material 12. Specifically, it is desirable to form a protrusion of about 3 to 10 mm. The protrusion 16a
Is not limited to the circular protruding portion of the present embodiment, and the shape, height, and the like can be arbitrarily set, for example, by forming a strip in a vertical or horizontal direction.

The provision of the synthetic fiber nonwoven fabric mat 16 prevents the sound absorbing material 12 from being deformed, eliminates restrictions on the shapes of the openings of the front plate 11A and the back plate 14A, and cleans the synthetic fiber nonwoven fabric mat. Thus, the sound absorbing member 1 can be protected from an external load, and the durability of the sound absorbing member 1 can be improved. Further, a synthetic resin film 13 covering the surfaces of the synthetic fiber nonwoven fabric mat 16 and the sound absorbing material 12.
Therefore, a sound absorbing effect at the boundary surface can be expected, and the sound absorbing performance of the sound absorbing member 1 can be improved. In addition, by disposing the synthetic fiber nonwoven fabric mat 16, the synthetic resin film 1
3 can be omitted.

The other structure and operation of the sound absorbing member 1A of this modification are the same as those of the sound absorbing member 1A of the second embodiment.

As shown in FIG. 5 and FIG.
On both outer sides of the sound absorbing device 7 in the width direction, a strut 95 made of H-shaped steel whose ends are fixed to the floor slab 51 and the sound absorbing device 7 is provided, and the strut 95 is provided with the fall prevention device 9. The fall prevention device 9 is used to prevent work materials such as paints, reinforcing bars, and concrete, work tools, and the like from dropping on the road 8 and the worker from falling down during repair work on the side wall 53 and the like of the viaduct 5. The extension is provided along the longitudinal direction of the viaduct 5 and is usually installed at a storage position below the floor slab 51 of the viaduct 5, and an adjusting tool 92 such as a chain is used during repair work. By operating it, it swings around the hinge 91 and is installed at the projecting position 9 ′ outside the lower side wall 53 of the viaduct 5. The overhang width W of the fall prevention device 9 is such that when repairing the side walls 53 of the viaduct 5, work materials such as paints, reinforcing bars, concrete, work tools, etc., fall on the road 8 or the worker falls down. Is desirably set to a width that can prevent the above, for example, about 1 m. Further, in the present embodiment, the fall prevention device 9 is provided with the fixed portion 96 for the convenience of setting the height H of the work space 6 to be large, but the height H of the work space 6 and the tension of the fall prevention device 9 are set. The fixed portion 96 may be omitted according to the width W.

The fall prevention device 9 is provided with the sound absorbing member 1B on a frame member 93 made of rust-proofed steel or aluminum so as to reduce the noise of a vehicle traveling on a road below the viaduct. Although arranged and configured, the sound absorbing member 1B can have a basically similar structure to the above sound absorbing members 1 and 1A.

[0047]

According to the sound-absorbing member of the present invention, it is not necessary to form the inside of the outer shell constituted by the porous plate by using a molding die as in the case of the conventional sound-absorbing material made of glass wool, but to simply synthesize it. Compress the synthetic fiber mass formed by tangling the fibers,
Because it is filled, the entangled synthetic fibers constituting the synthetic fiber mass play an effective sound absorbing effect,
Unlike conventional sound-absorbing materials made of glass wool, glass wool does not scatter and cause environmental destruction, and can be easily and inexpensively manufactured regardless of the shape of the sound-absorbing member. be able to.

The synthetic fiber mass can be formed by entanglement of a plurality of types of synthetic fibers having different fiber diameters, and in particular, 60 to 80% by weight of 20 to 40 denier synthetic fibers.
And 40 to 20% by weight of synthetic fibers of 2 to 5 denier are entangled to form a plurality of types of entangled synthetic fibers having different fiber diameters constituting a synthetic fiber mass. An effective sound absorbing action against noise can be achieved, and the sound absorbing performance of the sound absorbing member can be improved.

The synthetic fiber mass is formed by entanglement of a large-diameter polyvinylidene chloride fiber and a small-diameter polyester fiber so that the synthetic fiber mass is resistant to rainwater or the like and chemical resistance to exhaust gas or the like. A high synthetic fiber mass can be obtained, and the durability of the sound absorbing member can be improved.

Further, by covering the surface of the synthetic fiber mass with the synthetic resin film, a synthetic fiber mass hardly deformed can be obtained, and the restriction on the shape of the opening of the porous plate constituting the outer shell can be eliminated. At the same time, it is possible to obtain a synthetic fiber mass having high water resistance against rainwater and the like and chemical resistance against exhaust gas and the like, and it is possible to improve the durability of the sound absorbing member.

By disposing a synthetic fiber nonwoven fabric mat having an uneven surface on the outermost layer of the synthetic fiber mass, it is possible to obtain a synthetic fiber mass which is difficult to lose its shape, and to form a porous plate constituting the outer shell. In addition to eliminating the restriction on the shape of the opening, the synthetic fiber nonwoven fabric mat can protect the external load due to washing or the like, thereby improving the durability of the sound absorbing member. In addition, a sound absorbing effect can be expected at the boundary surface between the synthetic fiber nonwoven fabric mat and the synthetic resin film covering the surface of the synthetic fiber mass, and the sound absorbing performance of the sound absorbing member can be improved.

Further, according to the method for manufacturing a sound absorbing member of the present invention, a synthetic fiber mass formed by entanglement of synthetic fibers in a temporary frame is compressed and filled, and is constituted by a porous plate. When the sound absorbing member is manufactured by inserting it into the outer shell of the sound absorbing member and removing the temporary frame, the sound absorbing member can be easily assembled at a construction site, etc., and the completed sound absorbing member is transported. This can reduce the time and effort required for transporting the materials and reduce the cost.

[Brief description of the drawings]

1A and 1B show an example of a soundproof wall using the sound absorbing member of the present invention, in which FIG. 1A is a cross-sectional plan view, FIG. 1B is a front view, and FIG. 1C is a cross-sectional view taken along line AA of FIG. is there.

FIG. 2 shows a first embodiment of the sound absorbing member of the present invention, and (a).
Is a front view, (b) is a side longitudinal sectional view, and (c) is a plane transverse sectional view.

3A and 3B show a modification of the first embodiment of the sound absorbing member of the present invention, wherein FIG. 3A is a front view, FIG. 3B is a side vertical sectional view, and FIG.

FIGS. 4A and 4B show a synthetic fiber nonwoven fabric mat, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along line AA of FIG.

FIG. 5 is an external perspective view of a viaduct provided with a sound absorbing device and a fall prevention device.

FIG. 6 is a sectional view of the main part.

FIG. 7 is a sectional view showing a second embodiment of the sound absorbing member of the present invention used in the sound absorbing device.

FIG. 8 is an external perspective view in which a part of the temporary frame is cut away.

FIG. 9 is a sectional view showing a first modification of the second embodiment of the sound absorbing member of the present invention.

FIG. 10 is a sectional view showing a second modification of the second embodiment of the sound absorbing member of the present invention.

FIG. 11 is a sectional view showing a conventional sound absorbing member.

[Explanation of symbols]

 1, 1A, 1B Sound absorbing member 11, 11A Surface plate 11C Temporary frame 12 Sound absorbing material 13 Synthetic resin film 14 Back plate 14A Back plate 15 Frame member 16 Synthetic fiber nonwoven fabric mat 2 Side wall 3 Space 5 Viaduct 51 Floor slab 52 Bridge girder 53 Side wall 6 Work space 7 Sound absorbing device 8 Road 9 Fall prevention device

Claims (7)

[Claims] 1. Inside a shell constituted by a porous plate,
A sound absorbing member, wherein a synthetic fiber mass formed by entanglement of synthetic fibers is compressed and filled. 2. The sound absorbing member according to claim 1, wherein the synthetic fiber mass is formed by entanglement of a plurality of types of synthetic fibers having different fiber diameters. 3. The synthetic fiber mass is formed by entanglement of 20 to 40 denier synthetic fiber 60 to 80% by weight and 2 to 5 denier synthetic fiber 40 to 20% by weight. Item 3. The sound absorbing member according to Item 2. 4. The sound absorbing member according to claim 2, wherein the synthetic fiber mass is formed by entanglement of a large-diameter polyvinylidene chloride fiber and a small-diameter polyester fiber. 5. The sound absorbing member according to claim 1, wherein the surface of the synthetic fiber mass is covered with a synthetic resin film. 6. The sound absorbing member according to claim 1, wherein a synthetic fiber nonwoven fabric mat having an uneven surface is disposed on an outermost layer of the synthetic fiber mass. 7. A synthetic fiber mass formed by entanglement of synthetic fibers in a temporary frame is compressed and filled, and inserted into an outer shell of a sound absorbing member formed of a porous plate. By removing the inside of the outer shell composed of porous plates,
A method for producing a sound-absorbing member, comprising compressing and filling a synthetic fiber mass formed by binding synthetic fibers.