JP2003293474A - Indoor sound absorbing structure and building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide indoor sound absorbing structure and a building making effective use of an indoor space and having excellent sound absorbing performance. <P>SOLUTION: A closed space 14 is provided at the back face of an internal wall material 13 having a plurality of openings 13a, and a sound absorbing material 1 is provided in contact with the back face of the internal wall material 13. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an indoor sound absorbing structure and a building having the indoor sound absorbing structure.

[0002]

2. Description of the Related Art Conventionally, as a technique related to an indoor sound absorbing structure, for example, Japanese Patent Application Laid-Open No. 10-227082 discloses a soundproof structure for a building in which a sound absorbing material is attached to the wall surface of a staircase.

Further, Japanese Patent Laid-Open No. 7-217017 describes a sound absorbing member having an opening, a hollow portion connected to the opening is tapered, and an inner wall of the hollow portion is made of a sound absorbing material. There is.

Further, in Japanese Unexamined Patent Publication No. 10-311106, a ventilation material (ceiling plate) is provided below the ceiling slab at a certain distance from the lower surface of the ceiling slab, and the ventilation material is provided between the lower surface of the ceiling slab and the ventilation material. A soundproof ceiling structure with sound absorbing material is described.

[0005]

However, in the case of the soundproof structure for a building disclosed in Japanese Patent Laid-Open No. 10-227082, the interior space is narrowed because the sound absorbing material having a certain thickness or more is attached to the wall surface. Further, it is difficult to obtain a large sound absorbing performance, and particularly it is difficult to obtain a low sound absorbing performance.

Further, in the case of the sound absorbing member disclosed in JP-A-7-217017, the sound absorbing performance is improved, but the structure is complicated, so that the cost is high. Further, when the sound absorbing member is provided in the room, the room space is narrowed, which is the same as the above-described technique.

In the case of the soundproof ceiling structure disclosed in Japanese Unexamined Patent Publication No. 10-311106, since a ventilation material is provided as the ceiling plate, a sound absorbing effect in the high frequency range can be obtained, but the sound insulation performance of the ceiling is inferior. It was

The present invention has been made in view of the above problems, and an object of the present invention is to provide an indoor sound absorbing structure and a building which can effectively use the indoor space and have excellent sound absorbing performance.

[0009]

In order to achieve the above object, the invention according to claim 1 provides a closed space on the back surface of an interior material having a plurality of openings, and a sound absorbing material is provided on the back surface of the interior material. The sound absorbing structure in the room is characterized in that the sound absorbing structure is provided substantially in contact with each other.

Further, according to a second aspect of the present invention, a closed space is provided on the back surface of the interior material having a plurality of openings, and the closed space is provided so that the sound absorbing material keeps a predetermined distance from the back surface of the interior material. The sound absorbing structure in the room is characterized by being provided inside.

Further, the invention according to claim 3 is characterized in that a sealed space is provided on the back surface of the interior material having a plurality of openings, and a cylindrical body penetrating the interior material is provided in the opening. It is the sound absorption structure in the room.

The interior material in the present invention is not particularly limited, but an inorganic board such as gypsum board or calcium silicate board, a solid wood board or plywood, a wood board such as wood fiber board or wood chip cement board, or a metal board is used. it can. Moreover, those composite materials may be used, and those whose surface is made up may be preferably used. As the opening of the interior material, a plurality of openings are provided in advance, a perforated gypsum board or the like can be used, or an interior material having no opening can be provided with an opening of a predetermined size as necessary. It may be provided.

In the present invention, the closed space means that a space other than the interior material having the opening is closed. As the material for forming the closed space, the same material as the above-mentioned interior material may be used, or the constituent elements of the building or an accessory part of the building may be used.
Further, if the closed space is made of a noncombustible material, the fireproof performance or fireproof performance of the building having the indoor sound absorbing structure of the present invention can be made excellent.

In the present invention, the sound absorbing material is not particularly limited, but it is economical to use glass wool or rock rule. The tubular body penetrating the interior material may be a tubular body provided only on the back surface side of the opening, or the tubular body is provided so as to penetrate from the front surface to the back surface of the interior material through the opening. May be.

The invention according to claim 4 is the same as claim 1,
In the invention of either 2 or 3, it is the sound absorbing structure for a room, wherein the interior material having the plurality of openings is an inner wall material.

The invention according to claim 5 is the same as claim 1,
In the invention of either 2 or 3, it is the sound absorbing structure for a room, wherein the interior material having the plurality of openings is a ceiling plate.

The invention according to claim 6 is the same as claim 1,
In the invention of either 2 or 3, there is provided a sound absorbing structure for a room, wherein an interior material having the plurality of openings is provided on a surface of a storage device. The storage device according to the present invention may be fixed to a building such as a closet or a closet, or may be movable such as a chest of drawers or a clothes chest. Further, when the door of the storage device is used as the interior material having the opening, it is easy to make the storage device a closed space, and the area of the interior material having the opening can be increased, which is effective.

The invention according to claim 7 is the same as claim 1,
In the invention of either 2 or 3, it is the sound absorbing structure in the room, wherein the interior material having the plurality of openings is a stair riser.

The invention according to claim 8 is a building having any of the sound absorbing structures for an interior of claim 1 to claim 7.

[0020]

In the sound absorbing structure for indoor use according to the present invention, a closed space is provided on the back surface of the interior material having a plurality of openings, and the sound absorbing material is provided substantially in contact with the back surface of the interior material. There is.

That is, since the sound absorbing material is provided on the back surface of the interior material, the sound absorbing material does not narrow the indoor space. Further, the noise that has entered the closed space through the plurality of openings of the interior material is absorbed by the sound absorbing material, so that the noise level in the room can be lowered. Also, since the back surface of the interior material is a closed space, noise does not leak from the closed space,
Sound insulation performance does not deteriorate. Furthermore, if the closed space is made of a noncombustible material, the fireproof performance and fireproof performance will not be impaired.

In the indoor sound absorbing structure according to the second aspect of the present invention, a sealed space is provided on the back surface of the interior material having a plurality of openings so that the sound absorbing material keeps a predetermined distance from the back surface of the interior material. Is provided in the closed space.

That is, since the sound absorbing material is provided on the back surface of the interior material, the sound absorbing material does not narrow the indoor space. Further, the noise that has entered the closed space through the plurality of openings of the interior material is absorbed by the sound absorbing material, so that the noise level in the room can be lowered. At that time, the resonance frequency can be arbitrarily adjusted by adjusting the distance from the back surface of the sound absorbing material and the interior material, the aperture ratio, the size of the opening, and the thickness of the interior material. It is possible to make the sound absorbing performance excellent in the sound range.

Further, since the back surface of the interior material is a closed space, noise does not leak from the closed space and the sound insulation performance does not deteriorate. Furthermore, if the closed space is made of a noncombustible material, the fireproof performance and fireproof performance will not be impaired.

In the sound absorbing structure for the room according to the third aspect of the present invention, a sealed space is provided on the back surface of the interior material having a plurality of openings, and a cylindrical body penetrating to the back surface of the interior material is provided at the opening. Has been.

That is, since the sound absorbing structure is formed on the back surface of the interior material, it does not narrow the indoor space. Also,
The noise that enters the enclosed space through the tubular body that penetrates the interior material is absorbed by moving the air in the tubular body as the mass and moving the air in the enclosed space as a spring. Can be lowered (commonly called Helmholtz resonator). At that time, the resonance frequency is the reciprocal of the square root of the length of the cylindrical body and the volume of the closed space,
Also, since it is proportional to the square root of the opening cross-sectional area of the tubular body, the frequency of the noise to be absorbed can be set arbitrarily, so it is generally excellent in sound absorption performance in the low sound range where it is difficult to obtain an effect. be able to.

Further, since the back surface of the interior material is a closed space, noise does not leak from the closed space and the sound insulation performance does not deteriorate. Furthermore, if the closed space is made of a noncombustible material, the fireproof performance and fireproof performance will not be impaired.

In the indoor sound absorbing structure according to the fourth aspect of the invention, the interior material having a plurality of openings is the inner wall material.
Therefore, the sound absorbing structure can be formed by utilizing the space in the wall.

In the indoor sound absorbing structure of the fifth aspect of the invention, the interior material having a plurality of openings is the ceiling plate.
Therefore, the sound absorbing structure can be formed using the space above the ceiling.

In the sound absorbing structure for a room according to the sixth aspect of the present invention, an interior material having a plurality of openings is provided on the surface of the storage device. Therefore, the sound absorbing structure can be formed by utilizing the space that is rarely used such as the uppermost part or the lowermost part of the storage. Moreover, by providing a plurality of openings in the door of the storage device, sound can be absorbed in a large area.

In the sound absorbing structure for a room according to the seventh aspect of the invention, the interior material having a plurality of openings is a stair riser. Therefore, the sound absorbing structure can be formed using the space behind the stair riser that is rarely used.

In the building according to claim 8, claim 1
It has a sound absorbing structure for any of the rooms described in 1 to 7. That is, since the sound absorbing structure is formed, it is possible to obtain a building with low indoor noise level without narrowing the indoor space. Moreover, since the back surface of the interior material is a closed space, noise does not leak from the closed space, and a building with excellent sound insulation performance can be obtained. Furthermore, if the closed space is made of a non-combustible material, the building can have excellent fire protection and fire resistance.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described based on examples with reference to the drawings. FIG. 1 shows a first embodiment of the indoor sound absorbing structure of the present invention.
1A is a horizontal sectional view of a wall, and FIG. 1B is a vertical sectional view of FIG. 1A.

In FIG. 1, 10A indicates a wall.
The wall 10A has a sound absorbing structure in the room, a closed space 14 is provided on the back surface of an inner wall material (interior material) 13 having a large number of openings 13a, and the sound absorbing material 1 is provided on the back surface of the inner wall material 13. It is provided in contact. The sound absorbing material 1 has a thickness of 50 mm
Made of glass wool. Reference numeral 11 denotes an outer wall material, which is formed of a wood chip cement board with a surface of 20 mm in thickness. Numeral 12 is a stud, which is wood generally called a two-by-four material and having a cross section of 38 mm × 89 mm. 13 is an inner wall material (interior material).
Is formed from a plaster board having a thickness of 12 mm and having a large number of openings 13a.

The studs 12 and 12 are arranged in parallel with each other, and their upper ends are connected by an upper frame (not shown) and lower ends by a lower frame (not shown). The outer wall material 11 is formed on the outer surface of the studs 12, 12.
Are fixed with nails. An inner wall material 13 is fixed to the inner surfaces of the studs 12 and 12 with nails. Also, the inner wall material 1
The sound absorbing material 1 is provided in contact with the back surface of the sound absorbing member 3.

The studs 12, 12, the upper frame, the lower frame, and the outer wall material 1
1 and 1 form a closed space 14. Also, the outer wall material 1
An air layer having a thickness of 39 mm is formed between 1 and the sound absorbing material 1.

In the wall 10A, the noise that has entered the closed space 14 through the plurality of openings 13a of the interior material 13 is absorbed by the sound absorbing material 1, and the noise level in the room can be lowered. Further, since the back surface of the interior material 13 is the closed space 14, noise does not leak from the closed space 14,
The sound insulation performance of the wall 10A does not deteriorate.

Further, since the sound absorbing structure can be formed by utilizing the space in the wall 10A, the sound absorbing material 1 does not narrow the indoor space.

FIG. 2 shows a second embodiment of the indoor sound absorbing structure of the present invention. FIG. 2 (a) is a horizontal sectional view of a wall, and FIG. 2 (b) is a vertical sectional view of FIG. 2 (a). It is a figure. Differences from FIG. 1 are as follows. Wall 10B has studs 12,1
A plywood 16 having a thickness of 9 mm is fixed to the outer side of 2 with nails, and the outer wall material 11 has spacers 15 and 15 having a thickness of 20 mm.
It is fixed to the studs 12 and 12 with a nail through the through hole, and a ventilation layer 14a is formed. Further, the sound absorbing material 1 is the inner wall material 13
Is provided at a distance of 39 mm from the back surface of the. Further, between the studs 12, 12, a partition wall 19 made of an iron plate,
19 are provided horizontally, and a net 18 made of synthetic fiber is arranged on the surface of the sound absorbing material 1. The closed space 14 is
It is formed by studs 12, 12, partition walls 19, 19 and plywood 16.

In the wall 10B, the noise that has entered the closed space 14 through the plurality of openings 13a of the interior material 13 is absorbed by the sound absorbing material 1, and the noise level in the room can be lowered. At that time, the resonance frequency can be arbitrarily adjusted by adjusting the distance from the back surface of the sound absorbing material 1 and the interior material 13, the aperture ratio, the size of the opening 13a, and the thickness of the interior material 13. It is possible to make the sound absorbing performance excellent in the low sound range where it is difficult to obtain the effect.

Further, since the closed space 14 is formed by the partition wall 19, the risk of the sound absorbing material 1 falling due to its own weight is small. Further, the air in the closed space 14 does not circulate above and below the wall 10B, and the heat insulating property of the wall 10B is not deteriorated. Further, since the ventilation layer 14a is formed between the outer wall material 11 and the plywood 16, the risk of dew condensation in the wall 10B can be reduced.

FIG. 3 shows a third embodiment of the sound absorbing structure for a room according to the present invention, and is a vertical sectional view of a wall. Wall 10C
Is formed by arranging the outer wall material 11, the heat insulating material 1A, the inner wall material (interior material) 13, and the interior finishing material 131 from the outside. In the wall 10C, the outer wall 11 and the inner wall material 13 are integrally formed by filling urethane foam resin as the heat insulating material 1A between them. A large number of openings 13a are provided in a part of the inner wall material 13, and a box-shaped body 111 forming a closed space 14 is closely attached to the back surface thereof. Further, the sound absorbing material 1 is arranged so as to abut on the large number of openings 13a, thereby forming a sound absorbing structure inside the room.

The box-shaped body 111 is made of a calcium silicate plate having a thickness of 10 mm, and is designed so as not to deteriorate the fireproof performance of the interior material 13. An air layer is provided on the back surface of the sound absorbing material 1. Also, the interior finishing material 131 is
The cloth wall cloth ensures the ventilation of the opening 13a.

Since the closed space 14 of the wall 10C is formed of a noncombustible material, the fireproof performance and fireproof performance are not impaired.

FIG. 4 shows a fourth embodiment of the indoor sound absorbing structure of the present invention, and is a vertical sectional view of a wall. The difference between the wall 10D shown in FIG. 4 and the wall 10C shown in FIG.
Is provided so as to face upward, and the sound absorbing material 1 fills the box-shaped body 111. Also, no interior finishing material is provided.

In the wall 10D, since the opening 13b opens toward the ceiling, the opening 13b does not directly enter the visual field, and the design of the inner wall material 13 can be improved. Therefore, even if there is no interior finishing material, the interior design is not impaired. Further, the sound absorbing material 1 is the closed space 1
Since 4 is satisfied, dust and the like do not collect in the closed space, which is hygienic.

FIG. 5 shows a fifth embodiment of the indoor sound absorbing structure of the present invention, and is a vertical sectional view of the ceiling portion. In the ceiling portion 20A, the floor plate 21 is placed on the ceiling joist 22, and the ceiling board (interior material) 23 is fixed below the ceiling joist 22 with nails. Further, the sound absorbing material 2 is provided so as to contact the floor plate 21, and the lower surface of the sound absorbing material 2 and the ceiling plate 2 are provided.
An air layer is provided between the upper surface and the upper surface of 3. The floor joist 22 is a lumber having a cross section of 38 mm × 230 mm, and the floor board 21 is a particle board having a thickness of 20 mm. Further, the ceiling plate 23 has an opening 23 having a substantially circular cross section with a diameter of 3 mm.
It is a 12-mm-thick perforated gypsum board having a. The sound absorbing material 2 is asbestos having a thickness of 100 mm. An air layer of 130 mm is formed on the ceiling plate 23.

Both ends of the floor joist 22 are connected by end joists not shown. A closed space 24 is formed by the floor plate 21, joists 22, 22, and end joists. In this way
By utilizing the space above the ceiling, a sound absorbing structure having a large closed space 24 can be formed without narrowing the indoor space.

FIG. 6 shows a sixth embodiment of the indoor sound absorbing structure of the present invention, and is a vertical sectional view of the ceiling portion. Figure 6
The difference between the ceiling portion 20B of FIG. 5 and the ceiling portion 20A of FIG. 5 is that the box-shaped body 211 is provided between the ceiling joists 22 and 22 so as to abut the ceiling plate 23, and the ceiling of the opening of the box-shaped body 211 is different. This is that the plate 23 is provided with a large number of openings 23a. A cloth cloth 26 having excellent air permeability is laminated on the surface of the ceiling plate 23. A heat insulating material 2A is placed on the ceiling plate 23.

The box-like body 211 is made of an iron plate having a thickness of 1 mm and forms a closed space 24. The sound absorbing material 2 is provided therein so as to contact the ceiling plate 23. An air layer is formed on the upper surface of the sound absorbing material 2.

In the ceiling portion 20B, since the closed space 24 is formed of a noncombustible material, the fireproof performance and fireproof performance of the ceiling portion will not be impaired.

FIG. 7 shows a seventh embodiment of the indoor sound absorbing structure of the present invention. FIG. 7 (a) is a perspective view of a closet (storage device), and FIG. 7 (b) is FIG. It is a vertical sectional view of a). In the closet 30A, the inside of the housing 31 is divided into upper and lower parts by a partition wall 32, a front plate (the surface of the storage device) 33 is provided in the upper part, and the door 3
5 are provided.

The front plate 33 is provided with a number of slit-shaped openings 33a which are long in the lateral direction. Further, the upper part of the housing 31 and the partition wall 32 form a closed space 34.
Further, the sound absorbing material 3 is provided so as to maintain a predetermined distance from the front plate 33.

The upper part of the closet 30A has the sound absorbing structure for the room as described above. That is, since the sound absorbing structure can be formed by utilizing the space that is rarely used at the uppermost portion, the space can be effectively used.

Here, the closet is given as an example of the storage device, but the storage device may be fixedly provided in the building or movable furniture. In addition, as the installation location of the storage device,
It is effective to be installed anywhere in the room as long as it is a place where noise is generated, such as a passage, stairs, a kitchen, or a private room.

FIG. 8 shows an eighth embodiment of the indoor sound absorbing structure of the present invention. FIG. 8 (a) is a perspective view of a closet (storage device), and FIG. 8 (b) is FIG. It is a vertical sectional view of a). The closet 30 </ b> B has a housing 31 provided with a door (front surface of the storage device) 351. The door 351 is provided with a large number of louver-shaped openings 35a horizontally, and the openings 35a are formed upward toward the surface of the door 351. In addition, the sound absorbing material 3 is provided on the back surface of the door 351.
Are abutted against each other. In addition, the housing 31
The whole forms a closed space 34.

In the closet 30B, the door 351
By providing a plurality of openings 35a in the above, sound can be absorbed in a large area, and thus sound can be efficiently absorbed.

FIG. 9 shows a ninth embodiment of the indoor sound absorbing structure of the present invention. FIG. 9 (a) is a perspective view of stairs, and FIG. 7 (b) is a portion of FIG. 7 (a). It is a vertical sectional view. The staircase 40A is formed by placing and fixing the step board 41 on the sasara girder 45, fixing the bottom board 42 below the sasara girder 45, and providing the riser board 43 on the front surface of the step board 41. .

The riser plate 43 is provided with a plurality of circular openings 43a, and the sound absorbing member 4 is provided on the back surface of the riser plate 43.
Are in contact with each other, and an air layer is formed on the back surface thereof. A closed space 44 is formed by the footboard 41, the side girders 45 on both sides, and the bottom plate 42.

In the staircase 40A, the sound absorbing structure can be formed by utilizing the space behind the riser plate of the staircase which is rarely used.

FIG. 10 shows a tenth embodiment of the indoor sound absorbing structure of the present invention.
It is an example, and is a partial cross-sectional view of a staircase. The staircase 40B is different from the staircase 40A of FIG. 9B in that a cylindrical body 45 penetrating the riser plate 43 is provided in the opening 43a, and the sound absorbing material 4A is attached to the front surface of the riser plate 43. And a breathable cloth 46 so as to cover the opening 43a.
Is that it is stretched. In addition, the closed space 44
Is formed of a salsa girder (not shown), a step board 41, and an extruded cement board 46 having an L-shaped cross section and having a thickness of 10 mm.

The tubular body 45 has a length of 30 mm and an inner diameter of 20 mm.
Of synthetic resin, and the pitch between the openings 43a and 43a is 100 mm. Here, the length of the tubular body is
Although not particularly limited, it is preferably 5 mm to 35 mm, the inner diameter is 20 mm to 35 mm, and the pitch is 100.
It can be set to mm to 130 mm.

In the staircase 40B, the noise that has entered the closed space through the tubular body 45 penetrating the riser plate 43 is
By moving the air in the tubular body 45 as a mass and moving the air in the closed space 44 as a spring, energy is absorbed and the noise level in the room can be lowered. that time,
Since the resonance frequency is proportional to the length of the tubular body 45, the reciprocal of the square root of the volume of the closed space 44, and the square root of the opening cross-sectional area of the tubular body 45, the frequency of the noise to be absorbed can be set arbitrarily. Generally, it is possible to obtain excellent sound absorbing performance in a low sound range where it is difficult to obtain an effect.

Further, since the sound absorbing material 4A absorbs the sound generated when the step board 41 is stepped on, the sound generated when the stairs are raised and lowered can be further reduced. Specifically, the stairs walking sound is
The sound pressure level decreased by 5 dB in the band of 25 Hz to 250 Hz. Also, the sound coming from the living room on the first floor was reduced by 3 dB.

Although the embodiment of the present invention has been described above with reference to the drawings, the specific structure of the present invention is not limited to this embodiment, and there may be design changes and the like without departing from the scope of the present invention. Also included in the present invention.

[0066]

In the sound absorbing structure for the room according to the first aspect of the invention, since the sound absorbing material is provided on the back surface of the interior material, the sound absorbing material does not narrow the indoor space. Also,
The noise that has entered the closed space through the plurality of openings of the interior material is absorbed by the sound absorbing material, and the noise level in the room can be reduced. Further, since the back surface of the interior material is a closed space, noise does not leak from the closed space and the sound insulation performance does not deteriorate. Furthermore, if the closed space is made of a noncombustible material, the fireproof performance and fireproof performance will not be impaired.

In the sound absorbing structure for a room according to the second aspect of the invention, since the sound absorbing material is provided on the back surface of the interior material, the sound absorbing material does not narrow the indoor space. Further, the noise that has entered the closed space through the plurality of openings of the interior material is absorbed by the sound absorbing material, so that the noise level in the room can be lowered. At that time, the resonance frequency can be arbitrarily adjusted by adjusting the distance from the back surface of the sound absorbing material and the interior material, the aperture ratio, the size of the opening, and the thickness of the interior material. It is possible to make the sound absorbing performance excellent in the sound range.

Further, since the back surface of the interior material is a closed space, noise does not leak from the closed space and the sound insulation performance does not deteriorate. Furthermore, if the closed space is made of a noncombustible material, the fireproof performance and fireproof performance will not be impaired.

In the sound absorbing structure for the room according to the third aspect of the invention, since the sound absorbing structure is formed on the back surface of the interior material, the room space is not narrowed. In addition, the noise that enters the enclosed space through the tubular body that penetrates the interior material is
Energy is absorbed and the noise level in the room can be lowered by moving the air in the cylindrical body as a mass and the air in the closed space as a spring (generally called a Helmholtz resonator). At that time, since the resonance frequency is proportional to the length of the cylindrical body, the reciprocal of the square root of the volume of the closed space, and the square root of the opening cross-sectional area of the cylindrical body, the frequency of the noise to be absorbed can be set arbitrarily. Generally, it is possible to obtain excellent sound absorbing performance in a low sound range where it is difficult to obtain an effect.

Further, since the back surface of the interior material is a closed space, noise does not leak from the closed space and the sound insulation performance does not deteriorate. Furthermore, if the closed space is made of a noncombustible material, the fireproof performance and fireproof performance will not be impaired.

In the sound absorbing structure for the room according to the fourth aspect of the invention, since the sound absorbing structure can be formed by utilizing the space in the wall, the room space is not narrowed.

Further, in the indoor sound absorbing structure according to the fifth aspect of the invention, since the sound absorbing structure can be formed by utilizing the space above the ceiling, the indoor space is not narrowed.

In the sound absorbing structure for indoor use according to the sixth aspect of the invention, the sound absorbing structure can be formed by utilizing the space that is rarely used such as the uppermost part or the lowermost part of the storage. Moreover, by providing a plurality of openings in the door of the storage device, sound can be absorbed in a large area.

In the sound absorbing structure for the room according to the seventh aspect of the invention, the sound absorbing structure can be formed by utilizing the space behind the stair riser which is rarely used.

Further, in the building of the eighth aspect of the present invention, since the sound absorbing structure is formed, it is possible to obtain a building with a low indoor noise level without narrowing the indoor space. Also, because the back surface of the interior material is a closed space,
No noise leaks from the enclosed space, and the building has excellent sound insulation performance. Furthermore, if the closed space is made of a non-combustible material, the building can have excellent fire protection and fire resistance.

[Brief description of drawings]

FIG. 1 shows a first embodiment of an indoor sound absorbing structure of the present invention, and FIG. 1 (a) is a horizontal sectional view of a wall, FIG.
FIG. 1B is a vertical sectional view of FIG.

FIG. 2 shows a second embodiment of the indoor sound absorbing structure of the present invention, and FIG. 2 (a) is a horizontal sectional view of a wall,
FIG. 2B is a vertical sectional view of FIG.

FIG. 3 shows a third embodiment of the indoor sound absorbing structure of the present invention, and is a vertical sectional view of a wall.

FIG. 4 is a vertical sectional view of a wall, showing a fourth embodiment of the indoor sound absorbing structure of the present invention.

FIG. 5 shows a fifth embodiment of the indoor sound absorbing structure of the present invention, and is a vertical cross-sectional view of the ceiling portion.

FIG. 6 shows a sixth embodiment of the indoor sound absorbing structure of the present invention, and is a vertical sectional view of a ceiling portion.

FIG. 7 shows a seventh embodiment of the indoor sound absorbing structure of the present invention, and FIG. 7 (a) is a perspective view of a closet,
FIG. 7B is a vertical sectional view of FIG. 7A.

FIG. 8 shows an eighth embodiment of the indoor sound absorbing structure of the present invention, and FIG. 8 (a) is a perspective view of a closet,
FIG. 8B is a vertical sectional view of FIG.

9 shows a ninth embodiment of the indoor sound absorbing structure of the present invention, FIG. 9 (a) is a perspective view of a staircase, and FIG.
9B is a partial vertical sectional view of FIG. 9A.

FIG. 10 shows an eighth embodiment of the indoor sound absorbing structure of the present invention, and is a partial vertical sectional view of stairs.

[Explanation of symbols] 10A, 10B, 10C, 10D walls 1 sound absorbing material 13 Inner wall material (interior material) 13a opening 14 enclosed space 20A, 20B ceiling 23 Ceiling board (interior material) 23a opening 24 closed space 30A, 30B closet (storage device) 33 Front plate (front of storage device) 33a opening 34 closed space 351 Door (front of storage device) 35a opening 40A, 40B stairs 43 Raising board (interior material) 43a opening 44 enclosed space

Claims (8)

[Claims] 1. A sound absorbing structure in a room, wherein a closed space is provided on a back surface of an interior material having a plurality of openings, and a sound absorbing material is provided substantially in contact with the back surface of the interior material. 2. A closed space is provided on the back surface of an interior material having a plurality of openings, and a sound absorbing material is provided in the closed space so as to maintain a predetermined distance from the back surface of the interior material. Characteristic indoor sound absorption structure. 3. A sound absorbing structure in a room, wherein a closed space is provided on a back surface of an interior material having a plurality of openings, and a cylindrical body penetrating to the back surface of the interior material is provided at the opening. . 4. The sound absorbing structure for the room according to claim 1, wherein the interior material having the plurality of openings is an inner wall material. 5. The indoor sound absorbing structure according to claim 1, wherein the interior material having the plurality of openings is a ceiling plate. 6. The interior material having the plurality of openings is provided on a surface of a storage device.
Or the sound absorbing structure in the room according to any one of 3 above. 7. The sound absorbing structure for the room according to claim 1, wherein the interior material having the plurality of openings is a stair riser. 8. A building having the indoor sound absorbing structure according to any one of claims 1 to 7.