JPH09228535A - Soundproof ceiling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sound isolating performance by arranging a sound absorbing material having a powder layer revealing sound absorbing performance by vibration of particle on a ceiling member so as to be opposed to the upper floor member. SOLUTION: An upper floor member 1 and a ceiling member 5 formed of a cradling 23 and a ceiling surface material 4 are supported by a hanging tool 25 formed of a hanging bolt 24 and a cradling receiver 22. A sound absorbing material (sheet-like material 35) having a powder layer revealing sound absorbing performance by vibration of particle is arranged on the ceiling member 5 so as to be opposed to the upper floor member 1. The sheet-like matter 35 is formed of a power 33 by which the powder layer reveals sound absorbing performance, and a surface sheet 34 formed of an acoustically transparent base which holds the powder 33, and the thickness of the powder layer is set to 5mm or less. Further, the powder 33 has an average particle size of 0.1-1000μm and an empty density within the range of 0.1-1.5g/cm<3> , and the powder 33 formed of granular particles is used as a mixed powder with a powder formed of fine fiber body having a spring constant of 1×10<2> N/m or less. Thus, the floor impact sound can be effectively reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a soundproof ceiling structure. More specifically, the present invention relates to a soundproof ceiling structure including an upper floor material, a ceiling material arranged with a space below the upper floor material, and a suspender for suspending the ceiling material from the upper floor material. , It is intended to reduce the floor impact sound from the upper floor to the lower floor in a detached house or an apartment house.

[0002]

2. Description of the Related Art The ceiling structure of a detached house or an apartment house is fixed by fixing the ceiling material through a plurality of hanging trees installed on the lower surface of the floor material of the upper floor (the portion corresponding to the floor slab on the floor). The structure has a space between the upper floor material and the ceiling material. For example, in the case of a detached house, as shown in FIG. 10, a hanging member 21 and a field bridge 22 are hung from a beam 11 on a floor, and a ceiling material 5 composed of a field edge 23 and a ceiling surface material 4.
Are fixed by a hanging tree 21 and a field bridge 22. Further, in the case of an apartment house, as shown in FIG. 11, the ceiling bolt 5 and the ceiling surface material 4 including the ceiling 23 and the hanging bolt 24 and the field bridge 22 are suspended from the concrete slab 12.
Are fixed by hanging bolts 24 and field bridges 22.

As the ceiling surface material 4 used in such a ceiling structure, generally, gypsum board, plywood and the like can be mentioned.

[0004]

In the conventional ceiling structure,
Floor impact noise caused by jumping, walking, falling objects, etc. on the floor is a problem. As the propagation path of the floor impact sound,
Considered are a solid propagation path in which the vibration of the floor material above the floor propagates to the ceiling material via the hanging tree, and an air propagation path in which the radiated sound from the floor material above propagates as an acoustic wave in the air layer between the floor material and the ceiling material. Has been. However, in such a conventional ceiling structure, it is difficult to reduce the floor impact sound because the sound insulation performance in the bass range is particularly low in any propagation path, and it is necessary to improve the sound insulation performance in the bass range. Is desired.

Therefore, the problem to be solved by the present invention is to provide a ceiling structure having a high sound insulation performance even in a low sound range and capable of effectively reducing a floor impact sound.

[0006]

A soundproof ceiling structure according to a first aspect of the present invention is provided with an upper floor material, a ceiling material disposed below the upper floor material with a space therebetween, and a ceiling material suspended from the upper floor material. A ceiling structure including a suspender is characterized in that a sound absorbing material having a powder layer exhibiting sound absorbing performance due to vibration of particles is disposed on the ceiling material so as to face the upper floor material.

According to a second aspect of the present invention, in the soundproof ceiling structure according to the first aspect, the sound absorbing material has a bulk density of 200 kg / m ³ or less and 1.0 × 10 ^{3 to} 1.0 × 10 ⁶ N. A layer made of a porous base material having a Young's modulus in the range of / m ² is also provided, and the layer made of the porous base material is superposed below the powder layer. The soundproof ceiling structure according to claim 3 is the structure according to claim 1.
Or the ceiling material is at least 1
It has a piece of porous board. 200 porous boards
〜500kg / m ³ bulk density and 1.0 × 10 ⁸ 〜
Young's modulus within the range of 1.0 × 10 ¹⁰ N / m ² .

A soundproof ceiling structure according to a fourth aspect is the one according to any one of the first to third aspects, in which the powder layer has sound-absorbing performance and the powder is held by an acoustically transparent base material. It is a sheet, and the powder layer has a thickness of 5 mm or less. The soundproof ceiling structure according to claim 5 is the structure according to claim 4, wherein the powder has an average particle size of 0.1 to 1000 μm and a bulk density in the range of 0.1 to 1.5 g / cm ^3. Have.

According to a sixth aspect of the present invention, in the soundproof ceiling structure according to the fourth aspect, the powder is composed of granular particles and fine fiber bodies having a spring constant of 1 × 10 ² N / m or less. It is a mixed powder with powder. The soundproof ceiling structure according to claim 7 is the structure according to claim 4, wherein the powder has granular particles and fine fiber bodies attached to the surfaces of the granular particles,
The microfiber body has a spring constant of 1 × 10 ² N / m or less.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The soundproof ceiling structure of the present invention has, for example, the structure shown in FIG. This soundproof ceiling structure includes an upper floor material 1, a ceiling material 5, and a hanger 25.
The ceiling material 5 is suspended from the upper floor material 1 by suspenders 25. In FIG. 1, the ceiling material 5 is composed of the field edge 23 and the ceiling surface material 4, but the ceiling material 5 is composed only of the ceiling surface material 4, and the ceiling surface material 4 is directly connected to the hanging tool 25.
It may be suspended from the upper floor material 1. Also, FIG.
In the above, the suspending tool 25 is composed of two members including the suspending bolt 24 and the field bridge 22, but it may be a single member having these functions.

In this soundproof ceiling structure, a sound absorbing material is arranged on the ceiling material 5 so as to face the upper floor material 1. The sound absorbing material is provided with a powder layer that exhibits sound absorbing performance by vibrating particles, and may be provided with only the powder layer, or a composite material of the powder layer and another sound absorbing material. May be. The sound absorbing material of FIG. 1 includes only a powder layer, and a sheet-like material 35 in which a powder 33 that exhibits sound absorbing performance by vibration of particles as a powder layer is held by a surface sheet 34 made of an acoustically transparent base material is formed. It is shown.

In the soundproof ceiling structure of the present invention, when an impact sound is generated in the upper floor material 1, the impact sound is radiated into the space between the upper floor material 1 and the ceiling material 5 and is transmitted as a sound wave in this space. . With respect to this sound wave, the sound absorbing effect is exerted by the sound absorbing action in the low sound range based on the longitudinal vibration of the powder layer, which exhibits the sound absorbing performance by the vibration of the particles included in the sound absorbing material (sheet-like material 35). , Floor impact noise is reduced.

As described above, the powder layer is not particularly limited as long as it exhibits a sound absorbing effect by the vibration of the particles. As such a powder layer, a sheet-like material in which powder that exhibits sound absorbing performance due to vibration of particles is held by an acoustically transparent base material, and the thickness of the powder layer is 5 mm or less is easy to handle. This is preferable because it is possible to suppress the deterioration of the sound absorbing property due to the unevenness of the powder, the sound absorbing action in the low frequency region is enhanced, and the floor impact sound is effectively reduced.

Specific examples of the sheet-like material include those having a structure in which powder that exhibits a sound absorbing effect due to vibration of particles is closed by an acoustically transparent surface sheet, and powder that exhibits a sound absorbing effect due to vibration of particles. The body is filled into a sheet-like fiber structure such as non-woven fabric, glass wool, rock wool or the like, or inside a cell structure such as a mesh-shaped polymer sheet or paper honeycomb to be acoustically transparent. An example of the structure is a structure closed by a different surface sheet. Since the sheet-like material has such a structure,
It suppresses deterioration of sound absorption performance due to uneven distribution of powder, and is excellent in handleability as a material.

Powder exhibiting sound absorbing performance (powder constituting a powder layer exhibiting sound absorbing performance by vibration of particles, for example, powder used for a sheet-like object and held by an acoustically transparent base material As the body), a powder having an average particle size of 0.1 to 1000 μm and a bulk density in the range of 0.1 to 1.5 g / cm ³ , a powder composed of a granular body and a spring constant of 1 × 10 ² N / m or less mixed powder with a fine fibrous body, or a fine fibrous body having a granular particle and a fine fibrous body adhered to the surface of the granular particle and having a fine fibrous body of 1 × 10 ² N / m or less The powder which has a spring constant is mentioned.

The powder in the sheet material is 0.1
A powder having an average particle size of ˜1000 μm and a bulk density in the range of 0.1 to 1.5 g / cm ³ is desirable. By controlling the average particle diameter and the bulk density in this manner, a sound absorbing effect in the low sound range can be effectively obtained, and the floor impact sound can be reduced. If the average particle diameter or the bulk density is out of the above range, the sound absorption characteristics in the low sound range may be deteriorated. From the viewpoint of further enhancing the sound absorption characteristics in the low sound range, the powder in the sheet material has an average particle diameter of 1 to 300 μm and 0.1
More desirable is a powder having a bulk density in the range of 0.8 g / cm ³ . Examples of the powder used in the present invention include flat type and peak type powders having sound absorption frequency characteristics. Unless the frequency characteristics of the sound absorption coefficient are flat type or peak type, the sound absorption characteristics in the low sound range may be inferior.

Flat type, having frequency characteristics of sound absorption coefficient
Is when a sound wave with a frequency above a certain frequency is incident
In addition, it has a substantially constant sound absorption coefficient. Where special
Since the constant frequency changes depending on the thickness of the powder layer,
There is no particular limitation on the value of. Flat type, sound absorption frequency
The powder having several characteristics includes: vermiculite (average particle size: 200 to 400 μm,
Bulk density: 0.1g / cm^Three) ・ Wet silica (average particle size: 400-500 μm, bulky
Degree: About 0.1-0.2g / cm^Three) ・ Soft calcium carbonate (average particle size: 1-2 μm, bulky)
Degree: About 0.4g / cm^Three) Nylon powder (average particle size: 180-500 μm,
Bulk density: About 0.5g / cm ^Three) ・ Ferrite calcined product (average particle size: 1.3-1.5 μm,
Bulk density: about 1.0 g / cm ^Three) Gold mica (average particle size: 650 μm, bulk density: about 0.
5 to 0.6 g / cm^Three) Etc., each used alone, or
, Two or more powders are used together.

With a frequency characteristic of peak type sound absorption coefficient
Has the maximum value of the frequency characteristic curve of the sound absorption coefficient that is convex upward
That is. Here, the frequency that has a convex maximum is
The value is particularly limited because it changes depending on the thickness of the powder layer.
I don't know. Powder with peak-type sound absorption frequency characteristics
Examples thereof include silica, mica, talc and the like. Yo
More specifically, for example, gold mica (average particle size: 40 μm, bulk density: about 0.4
g / cm^Three) ・ Wet silica (average particle size: 7 to 150 μm, bulk density:
About 0.1-0.3g / cm^Three) ・ Spherical silica (average particle size: 3 to 28 μm, bulk density: approx.
0.3-0.9 g / cm^Three) Talc (average particle size: 1.5 to 9.4 μm, bulk density:
About 0.3-0.5g / cm^Three・ Acrylic resin fine powder (average particle size: 1-2 μm, bulky)
Degree: About 0.3g / cm^Three) Calcium silicate powder (average particle size: 20 to 30 μm,
Bulk density: about 0.1 g / cm ^Three・ Perlite powder (average particle size: 100-150 μm,
Density: About 0.1-0.2g / cm^Three) Fluororesin powder (average particle size: 5-25 μm, bulky)
Degree: About 0.4-0.5g / cm ^Three) ・ Bentonite (average particle size: 0.3-3.5 μm, bulk
Density: About 0.5-0.8g / cm^Three) Shirasu balloon (average particle size: 30-50 μm, bulky)
Degree: About 0.2-0.3g / cm^Three) ・ Fused silica (average particle size: 5 to 32 μm, bulk density: approx.
0.5-0.8g / cm^Three) ・ Silicon carbide powder (average particle size: 0.4 to 5.0 μm,
Density: about 0.6 to 1.1 g / cm^Three) ・ Nylon powder (average particle size: 5-250 μm, bulk
Density: About 0.3-0.5g / cm^Three) ・ Acrylic resin powder (average particle size: 45 μm, bulk density:
About 0.6-0.7g / cm^Three) ・ Carbon fiber powder (average fiber diameter: 14-18 μm, fiber
Length: 100-200 μm, Bulk density: About 0.5-0.6
g / cm^Three・ Titanium dioxide powder (average particle size: 0.1 to 0.25μ)
m, bulk density: about 0.5-0.7 g / cm^Three) Calcium carbonate powder (average particle size: 3 to 30 μm, bulk
Density: About 0.6-1.0g / cm^Three) ・ Vinyl chloride resin powder (average particle size: 130 μm, bulky)
Degree: about 0.5g / cm^ThreeBarium ferrite magnetic powder (average particle size: 1.8 to 2.2)
μm, bulk density: about 1.5g / cm^Three) ・ Silicone powder (average particle size: 0.3-0.7μ)
m, bulk density: about 0.2 to 0.3 g / cm^Three) Etc., each used alone, or
, Two or more powders are used together.

As an example, from the powder having the frequency characteristics of peak type sound absorption coefficient, the average particle size is 1.5 to 3.2 μm.
m, talc having a bulk density of about 0.4 g / cm ³ , and a powder having a flat type frequency characteristic of sound absorption coefficient has an average particle size of 200 to 400 μm and a bulk density of about 0.1 g / cm ³ . Choosing vermiculite, their normal-incidence sound absorption characteristics at a thickness of 30 mm are shown in FIG. In FIG. 2, a curve 6 shows a sound absorption coefficient characteristic of talc, and a curve 7 shows a sound absorption coefficient characteristic of vermiculite.

As the powder in the sheet-like material, a mixed powder of a powder composed of granular particles and a powder composed of a fine fiber having a spring constant of 1 × 10 ² N / m or less (preferably a spring constant of 10 N / m or less). Or a powder having granular particles and fine fiber bodies attached to the surfaces of the granular particles, the fine fiber bodies having a spring constant of 1 × 10 ² N / m or less (preferably a spring constant of 10 N / m or less) It is even more desirable to use the body. By using these powders, it is possible to further improve the sound absorption characteristics in the low sound range, lower the sound range, and reduce the thickness of the powder layer. If the spring constant of the fine fiber body deviates from the above range, the sound absorption characteristics in the low sound range may be deteriorated. In addition,
As the powder composed of granular particles, for example, the above-mentioned,
0.1-1000μm average particle size and 0.1-1.5g / cm
A powder having a bulk density in the range of ³ , preferably having an average particle size of 1 to 300 μm and 0.1 to 0.8 g / cm ^3.
A powder having a bulk density in the range of is desirable.

Specifically, as shown in FIG. 3, a powder consisting of granular particles 31 and a powder consisting of fine fibrous bodies 32 having a spring constant within the above numerical range are mixed or granular. By attaching the fine fibrous body 32 of the fine fibrous body 32 to the surface of the granular grain 31 of the fine particle of the particle 31, it is possible to further lower the sound absorption characteristic of the finer fibrous body 32. Therefore, the thickness of the powder layer (or the thickness of the sheet-like material) can be further reduced.

As the fine fibrous body 32 to be adhered to and mixed with the granular particles 31, whiskers such as metal whiskers, plastic fibers, plant fibers, glass fibers or a structure in which they are aggregated is used. More specifically, mention may be made of potassium titanate whiskers, silicon carbide whiskers, zinc oxide whiskers, calcium silicate needle powder, sepiolite and the like. The fiber diameter and fiber length are not particularly limited, but usually the average fiber diameter is 0.1 to 10 μm.
And the fiber length is in the range of several μm to several tens of μm.

The microfibrous body 32 is not limited to these, and may have a spring constant of 1 × 10 ² N / m or less, preferably a spring constant of 10 N / m or less. Furthermore, the mixing ratio of the granular particles 31 and the fine fiber bodies 32 is not particularly limited, but the weight ratio of the powder of the granular particles and the powder of the fine fiber bodies is, for example, 2
It is within the range of 0: 1 to 1:10, and preferably within the range of 5: 1 to 1: 3. If the ratio of the fine fibrous body powder is out of the above range, the sound absorption characteristics in the low sound range may be deteriorated. The method for adhering the fine fiber bodies 32 to the granular particles 31 is not particularly limited, but for example, a method in which the fine fiber bodies are mixed with a diluted binder and sprayed on the granular particles flowing in hot air, or There is a method in which granular particles coated with a heat-fusible binder and fine fiber bodies are mixed and heated.

The acoustically transparent substrate is not particularly limited as long as it can confine the powder, prevent the powder from spilling, and form a sheet-like material. The surface sheet 34 is one of acoustically transparent base materials. Specific examples of the acoustically transparent base material include breathable paper, woven fabric, non-woven fabric sheet, glass cloth; polyester film having a thickness of about 50 μm or less, polyethylene sheet, polymer sheet such as vinyl sheet, and aluminum foil. Acoustically transparent topsheets such as metal foils of. The acoustically transparent base material is appropriately selected depending on the average particle size and the filling amount of the powder that exhibits sound absorbing performance.

The sheet-like material may have a structure other than the above-mentioned structure in which the powder exhibiting the sound absorbing effect by the vibration of the particles is closed by the acoustically transparent surface sheet. The powder that exhibits the sound absorption effect by
Non-woven fabric of rayon, nylon, polypropylene, etc., which is filled inside a sheet-like fibrous structure such as glass wool, rock wool, etc., or a polymer in the form of a mesh that is a powder that exhibits a sound absorbing effect due to vibration of particles Examples thereof include a structure in which a cell, such as a sheet or a paper honeycomb, is filled inside and is closed by an acoustically transparent surface sheet. When the cell structure is flexible, the sheet-like material is easy to handle, which is preferable. Further, the surface sheet also needs to be integrated with the sheet-shaped fibrous structure or the cell structure, and therefore it is preferable that the surface sheet has tackiness, adhesiveness and heat-sealing property. In this case, the structure may be adhered to the binder or the like.

Next, the sound absorbing mechanism of powder particles will be described. When a sound wave is incident on the powder layer, the longitudinal vibration mode of the powder layer as shown in FIG. 4 is excited, and the sound absorption coefficient increases in the frequency band in which the mode occurs. Assuming that the frequency at which the sound absorption coefficient increases is the peak frequency (fr), fr can be expressed by the following equation by Young's modulus E of the powder layer, bulk density ρ, and powder layer thickness t. fr = (E / ρ) ^1/2 / 4t The Young's modulus E of the powder layer is determined by the spring constant of the powder particle surface.

Usually, the spring constant of the surface of the granular particles is 1 × 10.
^Since it is larger than ² N / m, the spring constant of the microfiber body is 1
If it is less than × 10 ² N / m, which is smaller than the spring constant of one granular particle, the sound absorption characteristics can be further lowered. Another soundproof ceiling structure of the present invention has, for example, the structure shown in FIG. This soundproof ceiling structure includes an upper floor material 1, a ceiling material 5, and a hanger 25. The ceiling material 5 is suspended from the upper floor material 1 by suspenders 25. FIG.
In the above, the ceiling material 5 is composed of the field edge 23 and the ceiling surface material 4, but the ceiling material 5 is composed only of the ceiling surface material 4, and the ceiling surface material 4 is directly connected to the hanging tool 25, and the upper floor material 1 It may be suspended from. Further, in FIG. 5, the suspending tool 25 is composed of two members including the suspending bolt 24 and the field bridge 22, but it may be a single member having these functions together.

In this soundproof ceiling structure, the sound absorbing material 3 is arranged on the ceiling material 5 so as to face the upper floor material 1. The sound absorbing material 3 includes the above-mentioned powder layer, and further includes a layer 36 made of a porous base material (hereinafter, the “layer made of a porous base material” may be referred to as a “porous base material layer”). ing. In FIG. 5, as the powder layer, the sheet-like material 35 in which the powder 33 that exhibits the sound absorbing performance by the vibration of the particles is held by the surface sheet 34 made of an acoustically transparent base material is shown, but the present invention is not limited to this. It is not something that will be done. The porous base material layer 36 is superposed below the powder layer (sheet-like material 35), and in the sound absorbing material 3, the powder layer (sheet-like material 35) is arranged so as to face the upper floor material 1. ing.

The porous base material forming the porous base material layer 36 has a bulk density of 200 kg / m ³ or less and 1.0 × 10 ³ to 1.0 × 10 ³ .
It has a Young's modulus in the range of 1.0 × 10 ⁶ N / m ² . If the bulk density and Young's modulus of the porous base material are out of the above ranges, the sound absorption characteristics may be poor. The method for producing the sound absorbing material 3 is not particularly limited. For example, a method of laminating the porous base material layer 36 and the powder layer (sheet-like material 35) using an adhesive, a heat-fusible binder. There is a method of laminating using, a method of adhering with an adhesive tape, and the like.

In the case of the structure shown in FIG. 5, the sound absorbing material 3
The sound absorption characteristics of No. 1 are determined by the sound absorption characteristics of the powder layer (sheet-like material 35) alone and the sound absorption characteristics of the porous base material layer 36. Usually, rock wool, glass wool, etc. have a bulk density of 200 kg / m ³ or less and a Young's modulus of 1.0 × 10 ³ to 1.
The porous base material layer having physical properties within the range of 0 × 10 ⁶ N / m ² exhibits sound absorbing characteristics in the middle and high sound range of 500 Hz or higher, but has almost no sound absorbing effect in the low frequency range. However, in the case of the structure shown in FIG. 5, the sound absorbing action in the low frequency range is enhanced by the sound absorbing action due to the resonance of the powder layer (sheet-like material 35) using the porous base material layer 36 as a spring.

At the same time, the powder layer (sheet-like material 35)
Has a sound wave transmission property, so a powder layer (sheet-like material 35)
The sound wave that has passed through is incident on the inside of the porous base material layer 36, so that sound absorption characteristics in the mid-high range can also be imparted. Also,
The porous base material layer 36 is arbitrarily selected according to the thickness of the powder layer (sheet-like material 35), the type of powder to be filled, and the physical properties.

In another soundproof ceiling structure of the present invention, the sound absorbing material 3 is used.
As the porous base material layer 36 having a specific physical property and a powder layer (sheet-like material 35) are laminated, the porous base material layer 36 is superposed below the powder layer to form a powder layer ( Since the sheet-like material 35) is arranged so as to face the upper floor material 1, the floor impact sound is first generated by the powder layer (sheet-like material 3).
5) It is reduced by the sound absorbing action in the low sound range based on the longitudinal vibration and the resonance action with the powder layer (sheet-like material 35) using the porous base material layer 36 as a spring. Further, the porous base material layer 36 is adapted to the sound wave transmitted through the powder layer (sheet-like material 35).
The sound absorption effect in the mid-to-high range is exhibited, and the floor impact sound is effectively reduced in a wider frequency range.

Yet another soundproof ceiling structure of the present invention is
For example, it has the structure shown in FIG. This soundproof ceiling structure
Includes a floor material 1 for the upper floor, a ceiling material 5, and a hanger 25
You. The ceiling material 5 is hung from the upper floor material 1 by the suspenders 25.
It has been lowered. The ceiling material 5 is at least one porous
Equipped with board, this porous board is 200 ~ 500kg / m
^ThreeAnd bulk density within the range of 1.0 × 10⁸~ 1.0 × 10
^Ten N / m^TwoAnd Young's modulus within the range. Porous
If the bulk density and Young's modulus of the cord deviate from the above ranges, the absorption
The sound characteristics may be inferior, and if it is a single plate, it is strong.
May cause problems.

In FIG. 6, the ceiling material 5 is composed of the ceiling surface material 4 made of a porous board and the field edge 23. However, the ceiling material 5 is provided on the ceiling surface material 4 and / or the field edge 23. There is no particular limitation as long as it has at least one porous board. When the ceiling surface material 4 is provided with at least one porous board, the ceiling surface material 4 as shown in FIG.
The whole structure may be a porous board, or a part of the ceiling surface material 4 may be a porous board. When a part of the ceiling surface material 4 is a porous board, it is preferable that the ceiling surface material 4 is formed by adhering at least one porous board and another material. Further, the ceiling material 5 may be composed of only the ceiling surface material 4, and the ceiling surface material 4 may be directly connected to the suspenders 25 and hung from the upper floor material 1. Further, in FIG. 6, the suspending tool 25 is composed of two members including the suspending bolt 24 and the field bridge 22, but it may be a single member having these functions together.

In this soundproof ceiling structure, a sound absorbing material is arranged on the ceiling material 5 so as to face the upper floor material 1, and the sound absorbing material is provided with a powder layer that exhibits sound absorbing performance by vibrating particles. There is. In FIG. 6, as the sound absorbing material, a sheet-like material 35 is shown in which powder 33 that exhibits sound absorbing performance due to vibration of particles is held by a surface sheet 34 made of an acoustically transparent base material.

In still another soundproof ceiling structure of the present invention, the impact sound generated from the upper floor material 1 is transmitted downstairs by the air propagation path and the solid propagation path. In the air propagation path, the impact sound is radiated from the upper floor material 1 to the space between the upper floor material 1 and the ceiling material 5, and is transmitted as a sound wave in this space. With respect to this sound wave, the sound absorbing effect is exerted by the sound absorbing action in the low sound range based on the longitudinal vibration of the powder layer, which exhibits the sound absorbing performance by the vibration of the particles included in the sound absorbing material (sheet-like material 35). , Floor impact noise is reduced. Further, the sound wave that has not been completely absorbed and is transmitted through the powder layer (sheet-like material 35) is propagated downward, and the sound absorption effect of the porous board is exerted on this sound wave, so that the floor impact sound is further reduced. . Further, in the solid propagation path, the impact sound from the upper floor material 1 is transmitted to the ceiling material 5 through the hanger 25. Here, since the ceiling material 5 is provided with the porous board having the above physical properties, the sound absorbing action of the porous board may be exhibited, and the floor impact sound may be further effectively reduced.

As the sound absorbing material used in FIG. 6, the sound absorbing material 3 in which the porous base material layer 36 as shown in FIG. 5 is superposed below the powder layer (sheet-like material 35) is used. It may be arranged so that the body layer faces the upper floor material 1. The floor impact sound is generated by the sound absorption effect in the low sound region based on the longitudinal vibration of the powder layer (sheet-like material 35) and the powder layer (sheet-like material 35) using the porous base material layer 36 as a spring. It is reduced by the resonance effect. Then, the powder layer (sheet 3
The sound absorbing effect of the porous base material layer 36 is exerted on the sound wave transmitted through 5) in the mid-high range, and the floor impact sound is effectively reduced in a wider frequency range. Furthermore, the sound absorbing action of the porous board is exerted on the sound waves that cannot be completely absorbed even by the porous base material layer 36, so that the floor impact sound is further effectively reduced. Further, the impact sound from the upper floor material 1 is transmitted to the ceiling material 5 through the hanger 25 by the solid propagation path. However, since the ceiling material 5 is provided with the porous board having the above-mentioned physical properties, the sound absorption effect of the porous board is exerted. Manifested and the floor impact sound may be reduced more effectively.

[0038]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples. However, the present invention is not limited to the following Examples. (Embodiment 1) FIG. 1 is a sectional view showing the construction of an embodiment of a soundproof ceiling structure according to the present invention. This soundproof ceiling structure is as described above, and includes the upper floor material 1 and the ceiling material 5.
And a hanger 25. The ceiling material 5 is a suspender 2.
5 is suspended from the floor material 1 above the floor. The ceiling material 5 includes a field edge 23 and a ceiling surface material 4. The hanger 25 is composed of two members, which are a hanger bolt 24 and a field bridge 22.

Here, a concrete slab is used as the upper floor material 1, and the space between the upper floor material 1 and the ceiling surface material 4 is 300 mm. Further, 45 mm square timbers are used as the field edge 23 and the field edge receiver 22, and the ceiling surface material 4 has a bulk density of 750 kg / m ³ and a Young's modulus of 1.8 × 1.
0 ⁹ gypsum board of N / m ² is used. In this soundproof ceiling structure, a sound absorbing material is arranged on the ceiling material 5 so as to face the upper floor material 1, and the sound absorbing material includes a powder layer that exhibits sound absorbing performance by vibrating particles. As the sound absorbing material, there is shown a sheet-like material 35 in which powder 33, which exhibits sound absorbing performance due to vibration of particles, is held by a surface sheet 34 made of an acoustically transparent base material.

As the sheet material 35, the surface sheet 34 is used.
In a bag of glass cloth (thickness: 0.2 mm) used as, a silica powder having an average particle diameter of 150 μm and a bulk density of 0.3 g / cm ³ (having frequency characteristics of peak type sound absorption coefficient),
Silicon carbide whiskers, which are fine fibrous bodies used as the powder 33 (average fiber diameter 0.4 μm, fiber length 5 to 20)
A 5 mm-thick sheet was used in which a mixed powder obtained by mixing a spring constant of 10 N / m within a range of μm at a weight ratio of 1: 1 was filled and the mouth of the bag was sealed with an adhesive and held. .

FIG. 7 shows the results of measuring the sound absorbing performance of the sound absorbing material in the soundproof ceiling structure of Example 1 by the method of measuring the reverberation room sound absorption coefficient defined in JIS A1409. From FIG. 7, the sound absorption peak frequency of the sound absorbing material of Example 1 is 125 Hz.
It can be seen that it is in the range of up to 250 Hz. Further, a ceiling structure in which the sound absorbing material is not provided in Example 1 was prepared, and this ceiling structure was used as a comparative example. 125 Hz to 50 in Comparative Example
Average floor impact sound at 0 Hz and 125 in Example 1
The difference from the average floor impact sound in Hz to 500 Hz was defined as the floor impact sound reduction amount (dB), and the results are shown in Table 1.

(Embodiment 2) FIG. 5 is a sectional view showing the construction of another embodiment of a soundproof ceiling structure according to the present invention. This soundproof ceiling structure is as described above. Example 2
Is the same as Example 1 except that the sound absorbing material is changed as described later in Example 1. The soundproof ceiling structure of Example 2 has a thickness of 25 mm and a bulk density of 24 kg /
A porous base material layer made of rockwool fiber having m ³ and Young's modulus of 1.6 × 10 ⁴ N / m ² and a powder layer are provided, and the porous base material layer is laminated and adhered below the powder layer. The ones that are overlapped with each other are used. As the powder layer of Example 2, silica powder having an average particle diameter of 150 μm and a bulk density of 0.3 g / cm ³ (having a frequency characteristic of peak type sound absorption coefficient).
Acicular powder of calcium silicate (average fiber diameter 1 μm, fiber length 5 to 10 μm,
Powder of polypropylene non-woven fabric made by spray-coating a mixed solution of particles with a spring constant of 16 N / m) and a water-based urethane emulsion binder, and drying it in hot air and adhering it (weight ratio between powders is 1: 1). Sprayed onto the voids of the fiber and held in the voids of the fiber.
A sheet-like material 35 having a thickness of about 2 mm formed by covering the surface with a polyester film of m is used. Therefore, the total thickness of the sound absorbing material is about 27 mm.

FIG. 8 shows the results of measuring the sound absorbing performance of the sound absorbing material in the soundproof ceiling structure of Example 2 by the reverberation room method sound absorption coefficient measuring method defined in JIS A1409. According to this result, the sound absorbing material of Example 2 has almost the same sound absorbing performance as that of Example 1 in the low frequency range, and has a higher sound absorbing performance than that of Example 1 in the middle and high frequency ranges. 1 in Comparative Example
Example 2 average floor impact sound from 25 Hz to 500 Hz
The difference from the average floor impact sound at 125 Hz to 500 Hz in Table 1 is defined as the floor impact sound reduction amount (dB), and the results are shown in Table 1.
It was shown to.

(Embodiment 3) FIG. 9 is a sectional view showing the construction of still another embodiment of the soundproof ceiling structure according to the present invention.
This soundproof ceiling structure is as described above. The third embodiment is the same as the second embodiment except that the ceiling surface material 4 is changed as described later in the second embodiment.

The soundproof ceiling structure of Example 3 has a thickness of 9 mm, a bulk density of 400 kg / m ³ , and a Young's modulus of 1.
A porous board made of rock wool board of 6 × 10 ⁸ N / m ² is used. 125 Hz in the comparative example
Average floor impact sound at 500 Hz and 1 in Example 3
The difference from the average floor impact sound at 25 Hz to 500 Hz was defined as the floor impact sound reduction amount (dB), and the results are shown in Table 1.

[0046]

[Table 1]

From Table 1, it can be seen that in Examples 1 to 3, the floor impact sound level is reduced by about 3 to 7 dB in the frequency range of 125 Hz to 500 Hz as compared with the comparative example. In addition,
In the above embodiments, the shape, size and position of the sound absorbing material can also be arranged in such a shape, size and position as long as the resonance of the sheet-like material in the sound absorbing material is not hindered. At this time, the area of the sound absorbing material is about 20 times the area of the ceiling material.
% Is desirable.

[0048]

The soundproof ceiling structure of the present invention comprises the upper floor material,
A ceiling material arranged across the space under the floor material above the floor,
In a ceiling structure including a suspender for suspending the ceiling material from the upper floor material, a sound absorbing material provided with a powder layer that exhibits sound absorbing performance by vibration of particles, the ceiling so as to face the upper floor material. Since it is characterized by being placed on the material,
The sound insulation performance is high even in the low sound range, and the floor impact sound can be effectively reduced.

Sound absorbing material is 200 kg / m^ThreeAnd the bulk density below
1.0 x 10^Three~ 1.0 × 10⁶N / m ^TwoYoung within
And a layer of a porous base material having a ratio of
When a layer of material is superposed below the powder layer,
Resonance with the powder layer using the porous substrate layer as a spring, and
And the acoustic wave transmitted through the powder layer is caused by the porous base material layer.
Since it has a sound absorbing effect in the mid-high range, it can prevent floor impact noise.
Effective reduction in a wider frequency range
Can be.

The ceiling material comprises at least one porous board, the porous board having a bulk density in the range of 200 to 500 kg / m ³ and 1.0 × 10 ^{8 to} 1.0 × 10 ¹⁰ N / m ^2. When the Young's modulus is within the range, the sound absorption effect of the porous board is exerted on the sound waves that cannot be completely absorbed by passing through the powder layer, so that the floor impact sound can be more effectively reduced. You can Further, the sound absorption effect of the porous board can be exerted on the floor impact sound transmitted to the ceiling material 5 through the solid propagation path through the hangings from the upper floor material.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a soundproof ceiling structure of the present invention.

FIG. 2 is a diagram showing sound absorbing characteristics of a powder layer having flat type and peak type sound absorbing characteristics.

FIG. 3 is a conceptual diagram of a powder in which fine fibrous bodies are attached to the surfaces of granular particles.

FIG. 4 is a diagram showing a vibration mode of a powder layer in a sound absorbing material.

FIG. 5 is a sectional view showing an embodiment of the soundproof ceiling structure of the present invention.

FIG. 6 is a sectional view showing an embodiment of the soundproof ceiling structure of the present invention.

FIG. 7 is a graph showing the sound absorbing performance of the sound absorbing material used in Example 1.

FIG. 8 is a graph showing the sound absorbing performance of the sound absorbing material used in Example 2.

FIG. 9 is a sectional view showing an embodiment of a soundproof ceiling structure of the present invention.

FIG. 10 is a cross-sectional view showing a conventional ceiling structure.

FIG. 11 is a cross-sectional view showing another conventional ceiling structure.

[Explanation of symbols]

 First floor upper floor material 3 Sound absorbing material 4 Ceiling surface material 5 Ceiling material 11 Beam 12 Concrete slab 21 Hanging tree 22 Field edge receiving 23 Field edge 24 Hanging bolt 25 Hanging tool 31 Granular particle 32 Fine fiber body 33 Powder 34 Surface sheet 35 Sheet Material 36 Porous substrate layer

Claims (7)

[Claims] 1. A vibration of particles in a ceiling structure including an upper floor material, a ceiling material disposed below the upper floor material with a space therebetween, and a suspender for suspending the ceiling material from the upper floor material. A sound-proof ceiling structure, wherein a sound-absorbing material having a powder layer exhibiting sound-absorbing performance is disposed on the ceiling material so as to face the upper floor material. 2. The sound absorbing material is 200 kg / m^ThreeThe following bulk density
Degree and 1.0 × 10^Three~ 1.0 × 10 ⁶N / m^TwoWithin the range of
And a layer made of a porous base material having
A layer made of a porous base material is superposed below the powder layer.
The soundproof ceiling structure according to claim 1. 3. The ceiling material comprises at least one porous board, the porous board having a bulk density in the range of 200 to 500 kg / m ³ and 1.0 × 10 ^{8 to} 1.0 × 10 ^10. N
The soundproof ceiling structure according to claim 1 or 2, which has a Young's modulus within a range of / m ² . 4. The sheet-like material, wherein the powder layer has a powder exhibiting sound absorbing performance held by an acoustically transparent substrate, and the thickness of the powder layer is 5 mm or less. Soundproof ceiling structure according to any one of. 5. The soundproof ceiling structure according to claim 4, wherein the powder has an average particle diameter of 0.1 to 1000 μm and a bulk density in the range of 0.1 to 1.5 g / cm ³ . 6. The soundproof ceiling according to claim 4, wherein the powder is a mixed powder of powder made of granular particles and powder made of fine fibrous bodies having a spring constant of 1 × 10 ² N / m or less. Construction. 7. The powder has granular particles and fine fiber bodies attached to the surfaces of the granular particles, wherein the fine fiber bodies are 1
The soundproof ceiling structure according to claim 4, which has a spring constant of × 10 ² N / m or less.