JP2000352144A - Structure of sound insulating ceiling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce impulsive sound of a floor by suspending a ceiling material from a ceiling substrate through a sound insulation unit in which a plate and an energy absorbing member are arranged in a prescribed state. SOLUTION: A ceiling material 2 is suspended from a ceiling substrate 1 through a plurality of sound insulation units 6, the periphery of the unit 6 that is close to a wall material W integral with the substrate 1 is supported to the wall W by an elastic body 8. Subsequently, in the unit 6, a plurality of closed small spaces S are formed of partition plates 4A and 4B parallel with the substrate 1 and the ceiling material 2, vertically elastically deformable energy absorbing members 5A and 5B made up of an elastic rubber and a metal bellows, whereby propagation downstairs of the impulsive sound of a ceiling through a solid propagation route can be reduced due to the consumption of vibration energy by the vibration of the entire sound insulation units due to the elastic displacement of the energy absorbing members, and the vibration of the partition plate consumes vibration energy and reduce propagation through an air propagation route. An air propagation sound from a wall material also can be reduced by the consumption of vibration energy by the small spaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof ceiling structure, and more particularly, to a soundproof ceiling structure for reducing the propagation of floor impact noise from a floor to a floor in a detached house or an apartment house. is there.

[0002]

2. Description of the Related Art A ceiling structure of a detached house or an apartment house is a part generally corresponding to a ceiling base material on a floor (a floor slab, a concrete slab, a beam, etc. on a floor). Space) between the ceiling base material and the ceiling material by hanging and supporting a ceiling material such as gypsum board or plywood via a plurality of hanging materials such as hanging trees or hanging bolts installed on the lower surface of Is adopted.

[0003] By the way, in a detached house or an apartment house, the floor impact sound to the lower floor, which is a problem, is a heavy impact sound caused by jumping, running around, walking, etc. on the floor.
Light impact noise caused by falling objects or dragging,
In any of these floor impact sounds, the propagation path of the impact sound to the downstairs includes a solid propagation path in which the vibration of the ceiling base material is transmitted to the ceiling material through the hanging material, and a sound radiated from the ceiling base material in the ceiling. An air propagation path that transmits an air layer in the space between the base material and the ceiling material as sound waves is considered. In the conventional general ceiling structure, it is difficult to sufficiently reduce the floor impact sound in any of these propagation paths, particularly because the sound insulation performance in a low frequency range of 250 Hz or less is low.

In order to reduce such floor impact noise downstairs, a conventional method is disclosed in (1) JP-A-9-2285.
No. 36, Japanese Patent Application Laid-Open No. 9-228535, etc., a sound absorbing material obtained by laminating porous materials having different bulk densities and Young's moduli on a ceiling material, or exhibiting sound absorbing performance by vibration of particles. A sound absorbing material provided with a powder layer,
(2) A sound absorbing material provided along a wall surface around a ceiling material as in, for example, JP-A-10-311105,
(3) As disclosed in, for example, Japanese Patent Application Laid-Open No. 10-311106, an air-permeable material having a honeycomb structure made of paper is used as a ceiling material, and a sound absorbing material is provided between the air-permeable material and the ceiling base material.
(4) As in Japanese Patent Application Laid-Open No. 10-183849, a vibration damping material in which a fluid is sealed inside an elastic body is interposed in the middle of a suspending tool that suspends and supports a ceiling material on a ceiling base material. thing,
And so on.

[0005]

However, among the above-mentioned conventional soundproof ceiling structures, the structures (1) to (3) have a certain effect in reducing the floor impact noise due to the air propagation path, but the ceiling base structure has a certain effect. Due to the low reduction effect of air propagation noise radiated from the downstairs wall material that is integrally connected to the material and the fact that the floor impact sound due to the solid propagation path is not considered, it is sufficient for sound insulation performance especially in low frequency range Effects cannot be obtained. Further, the structure (4) is effective in reducing the floor impact sound caused by the solid propagation path through the hanging member, but is hardly effective in reducing the floor impact sound caused by the air propagation path.

As described above, none of the conventional soundproof ceiling structures takes into account both the solid propagation path and the air propagation path, so that the sound insulation performance is low especially in a low frequency range, and the floor impact sound is sufficiently reduced. It was difficult to reduce it.

The present invention has been made in view of the above-mentioned circumstances, and considers an entire building as one coupled system of sound and vibration.
It is an object of the present invention to provide a soundproof ceiling structure that can significantly reduce the propagation of floor impact noise from both sides of a solid propagation path and an air propagation path.

[0008]

In order to achieve the above object, a soundproof ceiling structure according to the present invention is installed on a ceiling base material (1) on a floor and below the ceiling base material (1). In a space (3) between the ceiling material (2) and at least one plate material (4) positioned parallel to the ceiling base material (1) and the ceiling material (2).
Absorbing member capable of elastic displacement in the vertical direction
And one or more of the soundproof units (6) formed by partitioning a plurality of closed small spaces (S), and the ceiling base material (1) is interposed through the soundproof units (6). )
The ceiling material (2) is suspended and supported.

According to the present invention having the above structure, when vibration generated by an impact on the ceiling base material (1) is transmitted to the ceiling material (2) via the soundproofing unit (6), the soundproofing unit (6). The entire unit (6) vibrates and consumes vibration energy due to the elastic displacement action of the energy absorbing member (5), thereby reducing the vibration level of the ceiling material (2) and reducing the solid propagation path. , It is possible to reduce the propagation of the impact sound to the downstairs. Further, since the space (3) between the ceiling base material (1) and the ceiling material (2) is divided into a plurality of closed small spaces (S) via the soundproofing unit (6), Regardless of the floor impact at any position on the ceiling base material (1), the plate members (4) forming each small space (S) vibrate individually, consume the vibration energy at that location, and cause the air propagation path. , It is possible to reduce the propagation of the impact sound to the downstairs. Furthermore, it is possible to arbitrarily change the acoustic characteristics of each small space by the presence or absence of the plate material (4) and the selection of the number of sheets to be used, whereby the lower floor wall material (W) integrally connected to the ceiling base material (1) can be changed. ) Is also taken into one of the small spaces (S) and its energy is consumed, so that it is possible to reduce the airborne sound directly transmitted downstairs as sound waves.

[0010] In the soundproof ceiling structure having the above structure, the energy absorbing member (5) in the soundproofing unit (6) includes:
As described in claim 2, it may be made of either elastic rubber or a metal bellows. In particular, when made of elastic rubber, a more excellent soundproofing effect is obtained by absorbing vibration energy. can get.

Further, in the soundproof ceiling structure having the above structure,
A plurality of plate members (4) forming the soundproofing unit (6) are arranged in the vertical direction to form a closed small space (S) in upper and lower layers so that vibration accompanying the individual vibration of the plate members (4) is obtained. Energy consumption can be increased, and the effect of reducing the impact noise due to air propagation can be further enhanced.

Further, at least one of the soundproofing units (6) is arranged close to a wall material (W) integrally connected to the ceiling base material (1) and elastically supported by the wall material (W). By adopting, it is possible to stably support the ceiling material (2) and the soundproofing unit (6) with respect to the building frame, and to reduce solid propagation of vibrations through the wall material (W) and the supporting portion. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a soundproof ceiling structure according to the present invention. This soundproof ceiling structure is applied to a detached house, an apartment house, and the like. A plurality of soundproof units 6 are arranged in a space 3 between the ceiling material 2 such as a gypsum board and a plywood installed under the ceiling base material 1.
The ceiling material 2 is suspended from the ceiling base material 1 via the ceiling material, and the ceiling material 2 and the soundproofing unit 6 are disposed in proximity to the wall material W integrally connected to the ceiling base material 1 so as to form a building frame. Is elastically supported by the wall material W via a ceiling support 7 and an elastic body 8 fixed to the wall material W at the periphery. In addition, as the elastic body 8, natural rubber, butyl rubber,
Nitrile rubber, chloropyrene rubber and the like are used.

As shown in the perspective views of FIGS. 1 and 2, the soundproofing unit 6 includes the ceiling base material 1 and the ceiling material 2.
And two upper and lower partition plate members 4A and 4B which are located in parallel with each other and are formed differently from each other.
A plurality (three in this example) of energy absorbing members 5A and 5B (which become suspension members) which are vertically and elastically deformable and are arranged in a rectangular shape and a cross shape at the peripheral portion and the central portion of A and 4B. Is formed in a closed small space S.

The energy absorbing members 5A and 5B in the soundproof unit 6 are most preferably elastic rubbers such as rubber elastomers, but may be metal bellows. Further, as the partition plate members 4A and 4B, SS4
Although a metal material such as 00 is preferable, a plastic resin such as wood or PVC may be used.

In the soundproof ceiling structure configured as described above, when an impact is applied to the ceiling base material 1 on the floor, the vibration is transmitted to the soundproof unit 6 and the elasticity of the energy absorbing members 5A and 5B is increased. When the entire unit 6 vibrates due to the displacement action, the vibration energy is consumed and the vibration level of the ceiling material 2 is reduced. That is, the propagation of the impact sound to the downstairs by the solid propagation path is reduced. Further, since the space 3 between the ceiling base material 1 and the ceiling material 2 is partitioned into a plurality (three) of closed small spaces S in the soundproofing unit 6, at any position on the ceiling base material 1. Even if there is an impact, the individual vibration of the partition plates 4A and 4B forming the small spaces S consumes the vibration energy at that location and reduces the transmission of the impact sound to the downstairs by the air propagation path.
Further, the radiated sound from the wall material W downstairs integrally connected to the ceiling base material 1 is also taken into one of the small spaces S and its vibration energy is consumed. As a result, the airborne sound transmitted directly downstairs is also reduced.

As described above, the entire building is regarded as one coupled system of sound and vibration, and not only the impact sound applied to the floor, but also the air propagation sound from the building body such as the wall material W is reduced. Thereby, it is possible to exhibit a very high soundproofing effect as a whole.

FIG. 3 shows a second embodiment of the soundproof ceiling structure according to the present invention. In this second embodiment, a thick fixing plate material that can be directly fixed to the lower surface of the ceiling base material 1 is shown. 9 is provided, and the upper end of the soundproof unit 6 is fixed to the fixing plate 9 and the elastic support of the peripheral portion of the soundproof unit 6 to the wall material W via the ceiling support 7 and the elastic body 8 provides soundproofing. Unit 6 is stably attached to the building frame. The lowermost partition plate member 4B of the soundproofing unit 6
Are also used as the ceiling material 2. Further, in the second embodiment, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 4 shows a third embodiment of a soundproof ceiling structure according to the present invention. In the third embodiment, a ceiling for elastically supporting a peripheral portion of the soundproof unit 6 on a wall material W is shown. Since the use of the support 7 and the elastic body 8 is omitted, and the other configuration is the same as that of the second embodiment, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will be omitted. Is omitted.

FIG. 5 shows a fourth embodiment of the soundproof ceiling structure according to the present invention. In the fourth embodiment, a ceiling for elastically supporting the peripheral portion of the soundproof unit 6 on the wall material W is shown. The use of the support body 7 and the elastic body 8 is omitted, and the ceiling member 2 is fixed to the lower surface of the lowermost partition plate member 4B of the soundproofing unit 6. Other configurations are the same as those of the third embodiment. Therefore, the same or corresponding parts are denoted by the same reference numerals and description thereof will be omitted.

FIG. 6 shows a fifth embodiment of a soundproof ceiling structure according to the present invention. In the fifth embodiment, a support structure similar to that of the first embodiment is employed. To
A ceiling base material 1 is provided between adjacent soundproofing units 6 and 6.
Material 7A and ceiling surface 2 suspended and fixed to the side
The elastic member 8A is interposed between the upper and lower opposing surfaces of the ceiling material support member 7B fixed and fixed to the side, so that the large-area ceiling material 2 and the plurality of soundproofing units 6 can be stably mounted on the building frame. Since it is constructed so as to be able to be constructed, and other configurations are the same as those of the first embodiment, the same or corresponding parts are denoted by the same reference numerals and description thereof will be omitted.

Next, a description will be given of a measurement experiment conducted by the present inventor using a reduced model regarding the effect of reducing the floor impact sound of the soundproof ceiling structure in each of the above embodiments. The reduced model M used in the experiment is a reduced version of the building frame.
As shown in FIG. 7, a rectangular parallelepiped having a width w of 0.386 m, a depth of d 0.489 m, and a height of h of 0.341 m is used as the outer dimension. A is made of wood having a side length of 27 mm, and is open on one side without a front wall. A soundproof ceiling structure was installed behind the ceiling surface C of the reduced model M, and the sound pressure level [dB] at the center was measured.

The specifications of the soundproof ceiling structure used in the test are as shown in Table 1, and the sound pressure levels measured for each model are as shown in FIGS. The floor impact sound to be measured is around 63 Hz and around 125 Hz.
Hz range.

[0024]

[Table 1]

The following has been clarified from the results of the measurement experiment using the reduced model. 1. As shown in the models A to E, when rubber elastomers are used as the energy absorbing members 5A and 5B in the soundproofing unit 6, the partition plates 4A and 4B vibrate to easily attenuate the energy. And the sound pressure is reduced, and a high soundproofing effect is obtained. On the other hand, as shown in Model F, Model H, and Model I, when using a metal material such as wood, SS400, or a plastic resin such as PVC as the energy absorbing members 5A and 5B in the soundproofing unit 6, the target frequency is 1 The sound pressure exceeds the reference value (indicated by the broken lines in FIGS. 8 to 16) at more than the point, and the soundproofing effect is low. For these reasons, it is desirable that the energy absorbing members 5A and 5B are elastic bodies that can be elastically displaced in the vertical direction, and among them, the use of rubber elastomers is most preferable.

2. As shown in Model B and Model E, the partition plates 4A and 4B in the soundproof unit 6
When a plastic resin such as wood or PVC is used, the sound pressure exceeds the reference value at one or more points of the target frequency, and the soundproofing effect is low. On the other hand, as shown in Model A, Model C, and Model D, the partition plates 4A, 4B
When a metal material such as 400 is used, the partition plate 4A,
Energy is easily attenuated by the vibration of 4B, the sound pressure at the target frequency is reduced, and a high soundproofing effect is obtained. For these reasons, it is preferable to use a metal material such as SS400 for the partition plates 4A and 4B. In addition, the partition plates 4A, 4B
Since the vibration energy is attenuated by the above vibration, it is preferable that the partition plate has two or more layers.

The size and number of the small spaces S defined by the soundproofing unit 6 are determined by the size and form of the downstairs room, and the acoustic characteristics are changed by changing the size. By changing it, the optimum soundproofing effect can be exhibited.

[0028]

As described above, according to the present invention, the vibration caused by the floor impact on the ceiling material on the floor is not only caused by the solid propagation path but also by the space between the ceiling material and the ceiling material. Paying attention to the fact that sound waves radiated from downstairs wall material integrally connected to the air propagation path and ceiling base material are also propagated downstairs, that is, the entire building is regarded as a single sound and vibration coupled system. ,
By using a soundproofing unit in which a plurality of small enclosed spaces are defined by at least one plate member and an energy absorbing member that can be elastically displaced up and down, an impact sound downstairs due to a solid propagation path and an air propagation path can be obtained. Can be reduced, and the airborne sound from the wall material can also be reduced. As a result, there is an effect that the sound insulation performance in the low frequency range can be enhanced and the sound insulation effect can be significantly improved.

In particular, by adopting a structure in which at least one of the soundproofing units is arranged close to a wall material integrally connected to the ceiling base material and elastically supported by the wall material, the ceiling material and the soundproofing unit can be installed in a building. While stabilizing the support for the frame, solid propagation of vibrations through the wall member and the support portion is also reduced, and a predetermined soundproofing effect can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a soundproof ceiling structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view of components in the soundproof ceiling structure.

FIG. 3 is a longitudinal sectional view of a main part of a soundproof ceiling structure according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a main part showing a soundproof ceiling structure according to a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a main part of a soundproof ceiling structure according to a fourth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a main part of a soundproof ceiling structure according to a fifth embodiment of the present invention.

FIG. 7 is a schematic perspective view of a reduced model used in a measurement experiment performed by the present inventor on the effect of reducing the floor impact sound of the soundproof ceiling structure in each embodiment.

FIG. 8 is a graph showing an experimental result (sound pressure: frequency) of a model A in the same measurement experiment.

FIG. 9 is a graph showing an experimental result (sound pressure: frequency) of a model B in the measurement experiment.

FIG. 10 is a graph showing an experimental result (sound pressure: frequency) of a model C in the same measurement experiment.

FIG. 11 is a graph showing an experimental result (sound pressure: frequency) of a model D in the same measurement experiment.

FIG. 12 is a graph showing experimental results (sound pressure: frequency) of a model E in the measurement experiment.

FIG. 13 is a graph showing an experimental result (sound pressure: frequency) of a model F in the measurement experiment.

FIG. 14 is a graph showing an experimental result (sound pressure: frequency) of a model G in the above measurement experiment.

FIG. 15 is a graph showing an experimental result (sound pressure: frequency) of a model H in the measurement experiment.

FIG. 16 is a graph showing an experimental result (sound pressure: frequency) of a model I among the above measurement experiments.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ceiling base material 2 Ceiling material 3 Space 4A, 4B Partition plate material 5A, 5B Energy absorption member (elastic rubber or metal bellows) 6 Soundproof unit S Closed small space W Wall material

Claims (4)

[Claims] 1. A space between a ceiling base material on a floor and a ceiling material provided under the ceiling base material, and at least one plate material positioned in parallel with the ceiling base material and the ceiling material, and a vertical direction. One or more soundproofing units are formed by partitioning a plurality of closed small spaces with an elastically displaceable energy absorbing member, and a ceiling material is attached to a ceiling base material via the soundproofing units. The soundproof ceiling structure is characterized in that the ceiling is suspended. 2. The soundproof ceiling structure according to claim 1, wherein the energy absorbing member is made of an elastic rubber or a metal bellows. 3. The soundproof ceiling structure according to claim 1, wherein a plurality of plate members forming the soundproofing unit are arranged in a vertical direction so that a closed small space is formed in a vertically multilayered manner. 4. The soundproof ceiling structure according to claim 1, wherein at least one of the soundproof units is disposed close to a wall material integrally connected to the ceiling base material and elastically supported by the wall material.