JPH11152836A - Soundproof ceiling construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a sound-absorbing characteristic of a medium/high frequency and transmit/reduce the resonant sound of a low frequency to reduce ceiling noise level by arranging sound absorbing materials having a fixed ventilation resistance and a gas permeability on the four corners of a ceiling slab. SOLUTION: Sound absorbing materials 5 are arranged on the four corners of a ceiling slab 1 made of a concrete slab and the like, and internally mounted ceiling material 4 made of a gypsum board of 12 mm in thickness is arranged on the part except them through hangers 2, and an air layer 3 is formed between the ceiling material and the ceiling slab 1. The sound absorbing material 5 is constituted of fiber aggregate which is molded out of staple under 30 denier in the center of fiber diameter distribution to make average apparent density to be 0.03-0.15 g/cm<3> . Hereby the sound absorbing material 5 improves a sound absorbing characteristic of a medium/high frequency by the ventilation resistance, transmits/reduces resonant sound of a low frequency by the gas permeability, and ceiling noise can be lowered. If necessary, the sound absorbing material 5 is partially arranged on the peripheral part or the center part of a ceiling except the four corners.

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 suitable for an apartment house such as a condominium having an RC structure, a hospital, a school, a gymnasium, a library and other buildings.

[0002]

2. Description of the Related Art A conventional soundproof ceiling has a double ceiling structure.
Measures were taken to improve sound insulation. For example,
As shown in FIG. 17, a conventional interior ceiling has an air layer 1 below a ceiling slab 100 made of a concrete slab or the like.
An interior ceiling material 102 is provided through the lining 01.

That is, in such an interior ceiling, a field support 105 is fixed to a hanger 104 fixed to a lower end of a bolt 103 projecting downward from the ceiling slab 100, and the field support 105 is clipped to the field support 105 by a clip 106. The interior ceiling material 102 is attached to the edge 107. The gap between the vehicle body wall 108 and the interior ceiling material 102 is filled with a surrounding edge 109.

[0004]

However, in the case of such a double ceiling structure, as shown in FIG. 18, the sound insulation is improved in the middle and high frequency bands, but is deteriorated in the low frequency band. However, the floor impact noise, particularly the floor impact noise of the weight source, may be deteriorated. This is presumably because the spring component of the sealed air in the double ceiling and the mass component of the interior ceiling material cause a resonance phenomenon, and the sound insulation is deteriorated (low-frequency resonance transmission phenomenon).

[0005] For this reason, a structure in which a gap is provided between the vehicle body and a wall to prevent air from being sealed has been studied. According to this method, although the low-frequency resonance transmission phenomenon can be reduced, the upper floor is not considered. The floor impact noise and the like generated from the floor leaks from the gap between the ceiling and the vehicle body wall, and the sound insulation in the middle and high frequency band is deteriorated. As described above, it is difficult for the conventional soundproof ceiling to have a sound insulation characteristic that can cover a floor impact sound from a low frequency band to a high frequency band.

Accordingly, the present invention has been made in view of the above-described circumstances, and has been described in connection with low-frequency resonance transmission (with respect to a floor impact sound at a weight source).
It is an object of the present invention to provide a soundproof ceiling structure capable of preventing a decrease in sound insulation and at the same time reducing a noise in a middle and high frequency band (light weight floor impact).

[0007]

That is, according to the present invention, in a ceiling structure in which a ceiling material is provided below a ceiling slab made of a concrete slab or the like, a part of the periphery that comes into contact with a wall of the ceiling surface is provided. The sound absorbing material is provided only at a part including at least four corners.

Further, in the invention according to claim 2, the sound absorbing material is constituted by a fiber aggregate having a constant air permeability and a constant air resistance.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows one of the four corners of a soundproof ceiling structure according to a first embodiment of the present invention. The soundproof ceiling structure according to the first embodiment is an apartment house (for example, a hospital, a school, a gymnasium, etc.). (Applicable in libraries and other buildings). In the soundproof ceiling structure of the first embodiment, the interior ceiling material 4 is partially (via the air layer 3) mounted on a ceiling slab 1 such as a concrete slab by a suspender 2 suspended by anchor bolts (not shown). It is provided. In addition, the sound absorbing material 5 is installed on the ceiling surface other than the portion where the interior ceiling material 4 is provided.

The interior ceiling material 4 is provided at a portion other than the portion on which the sound absorbing material 5 is provided on the ceiling surface, that is, at the periphery and at the center except for the four corners shown by white portions in FIG. The ratio of the occupied area to the area is 80%).
In this embodiment, a gypsum board having a thickness of 12 mm (plaster board PB12t manufactured by Yoshino Gypsum Co., Ltd.) is used, but is not limited to this. Although the interior ceiling material 4 is installed on the concrete slab 1 via the hanging tool 2, the ridge receiver, and the ridge (both not shown), a configuration in which the interior ceiling material is directly attached to the concrete slab may be used.

The sound absorbing material 5 is formed by disposing a fiber assembly, which will be described later, and is disposed only at the four corners of the ceiling as shown by the black portions in FIG. For example, as shown in FIG. 3, the four corners and the central part,
As shown in FIG. 4, in addition to the four corners, two places may be provided: a central part of a pair of opposing sides and a central part of a ceiling surface. In addition,
This sound absorbing material may be configured as a unit.

The fibrous aggregate is formed by forming a fibrous formed body of an aggregate of fibrous substances into a predetermined size. As the fiber molded body, the average apparent density is 0.055 g / using short fibers whose center of the fiber diameter distribution is 30 denier or less.
cm ³ (this average apparent density is 0.03-0.15 g /
cm ³ is preferable). In addition, by using short fibers of 30 denier or less and keeping the apparent density within a predetermined range, the airflow resistance inside the fiber molded body is increased to improve the sound absorbing characteristics. However, air permeability sufficient to transmit low frequency resonance tones generated by the compression of air in the air layer is ensured.

As the material of the short fibers, for example, natural fibers such as wool, cotton and hemp can be used in addition to synthetic fibers such as polyester, polypropylene, polyethylene, nylon and vinylon. Short fibers opened from a cloth using these fibers can also be used.

The sound absorbing material 5 is attached to the (ceiling) surface and the wall surface of the concrete slab 1 with an appropriate adhesive. For example, as shown in FIG. 5, mechanical means such as concrete nails 21 and pins are used. It can be attached by any suitable means, such as by attaching it with a screw. Also, as this sound absorbing material,
The present invention is not limited to this fiber aggregate, but may be a material having a similar effect such as rock wool or glass wool.
Further, the sound absorbing material may be constituted by a ceiling material.

Therefore, according to the first embodiment, the use of the sound-absorbing material 5 which is particularly permeable allows the low frequency band generated by the compression of the air in the air layer sealed in the conventional double ceiling to be generated. The resonance sound can be sufficiently transmitted, and a decrease in sound insulation performance can be prevented. For example, the noise level of a low-frequency impact sound caused by a weight source floor impact sound or the like generated on the floor on the floor (caused by a resonance phenomenon of a spring component of the air layer 3 and a mass component of the interior ceiling material 4) is reduced. become able to.

Next, the soundproof ceiling structure of the first embodiment was compared with a concrete base ceiling and a conventional ceiling (for example, as shown in FIG. 17) (all having a slab thickness of 15 mm).
(Implemented in a reverberation room of 0 mm), the result shown in FIG. 6 was obtained as to the performance of blocking light floor impact sound. From the experimental results, it was confirmed that, with regard to the JIS sound insulation grade, sound insulation performance of L-80 was obtained for a concrete body, L-65 was obtained for a conventional ceiling structure, and at least L-55 was obtained for the soundproof ceiling structure of this embodiment.

When a similar experiment was conducted for a heavy floor impact sound, the result shown in FIG. 7 was obtained. From the experimental results, it was confirmed that the sound insulation performance of L-55 for the concrete base, L-60 for the conventional ceiling structure, and at least L-55 or more for the soundproof ceiling structure of this embodiment can be obtained.

Next, a soundproof ceiling structure according to a second embodiment of the present invention will be described. In the soundproof ceiling structure of the second embodiment, as shown in FIG. 8, of the four sides (two sets of sides facing each other) of the ceiling surface, the entirety of one set of the sides (in the blacked area). (Shown) sound absorbing material 5 is provided.
On the ceiling surface other than the portion where the sound absorbing material 5 is provided, the interior ceiling material 4 is all installed. Also in this embodiment, as the method of attaching the interior ceiling material 4 and the sound absorbing material 5, the same method as that of the first embodiment is used, but it is not particularly limited to this. The interior ceiling material 4 and the sound absorbing material 5 are the same as those in the first embodiment, but are not limited thereto, and may be any suitable material.

The arrangement of the sound absorbing material 5 is as follows.
Of course, the present invention is not limited to the second embodiment,
For example, as shown by a black portion in FIG. 9, in addition to the entire opposite side of one set, a plurality (two) of them are arranged in parallel along the same direction, or as shown by a black portion in FIG. In addition, it is also possible to provide a substantially H-shape so as to connect the entire opposite side of the one set and the intermediate side with each other. Also in these embodiments, the interior ceiling material 4 is provided in all the white portions other than the black painted portions.

Next, a soundproof ceiling structure according to a third embodiment of the present invention will be described. In the third embodiment shown in FIG. 11, two sound absorbing members 5 forming an X-shape in the diagonal direction including the four corners of the ceiling surface are provided as indicated by black portions. In addition, the interior ceiling material 4 is all installed on the ceiling surface other than the portion where the sound absorbing material 5 is provided. In this embodiment, the same method as that of the first embodiment is used as a method of attaching the interior ceiling material 4 and the sound absorbing material 5.
It is not particularly limited to this. The interior ceiling material 4 and the sound absorbing material 5 are the same as those in the first embodiment, but are not limited thereto, and may be any suitable material.

Further, in the first to third embodiments, an air layer is not formed between the sound absorbing material 5 and the ceiling slab 1, but an air layer is formed between them. It may be configured. That is, as shown in FIG. 12, the rail-shaped suspension member 22 attached to the ceiling slab 1
As shown in FIG. 13, the sound absorbing material 5 is fitted on a normal mesh base 23 (for example, a light base or a wooden frame base) as shown in FIG. (Omitted). Also, as shown in FIG.
Instead of being hung from the ceiling slab 1, an appropriate mounting member 24 may be mounted on the surrounding wall surface and fixed to the mounting member 24.

Further, another embodiment according to the present invention will be described. In the soundproof ceiling structure shown in FIG. 15, a ceiling material 4 is supported on a ceiling slab 1 via a vibration-proof rubber 7. With such a configuration, as shown in FIG.
Regarding JIS sound insulation grade, L-5 for concrete base
5. The sound insulation performance of L-55 is obtained with the ceiling structure without the vibration proof support, and the sound insulation performance of L-50 is also obtained with the vibration proof support ceiling structure of this embodiment.

[0023]

As described above, according to the present invention, a sound-absorbing material having a certain degree of ventilation is used. It is possible to effectively prevent the generation of a floor impact sound (weight source) in a low frequency band due to a resonance phenomenon due to the propagation of a floor impact and the generation of a resonance sound of a low frequency due to compression of air in an air layer. .

At the same time, according to the present invention, a sound absorbing material having a density (sealing property) that does not allow floor impact sounds on the floor to leak into the room below the floor is used. Since it is possible to prevent the occurrence of (light) floor impact noise in the middle and high frequency bands due to leakage from the floor, in other words, over a wide range from the low frequency range to the high frequency range. Noise such as floor impact noise can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a soundproof ceiling structure according to the present invention.

FIG. 2 is an explanatory view showing an arrangement of a sound absorbing material on a ceiling in FIG. 1;

FIG. 3 is an explanatory view showing a modification of the arrangement of the sound absorbing material.

FIG. 4 is an explanatory view showing a modification of the arrangement of the sound absorbing material.

FIG. 5 is a sectional view showing another method of attaching the sound absorbing material.

FIG. 6 is a graph showing a comparison of a lightweight floor impact sound insulation performance with a conventional ceiling structure and the like.

FIG. 7 is a graph showing a comparison of heavy floor impact sound insulation performance with a conventional ceiling structure and the like.

FIG. 8 is an explanatory view showing an installation state of a sound absorbing material in another ceiling structure.

FIG. 9 is an explanatory view showing an arrangement of another sound absorbing material.

FIG. 10 is an explanatory view showing the arrangement of another sound absorbing material.

FIG. 11 is an explanatory view showing the arrangement of another sound absorbing material.

FIG. 12 is an explanatory diagram showing an installation state of another sound absorbing material.

FIG. 13 is an explanatory diagram showing an installation state of another sound absorbing material.

FIG. 14 is an explanatory view showing an installation state of another sound absorbing material.

FIG. 15 is a sectional view showing a vibration-proof support ceiling.

FIG. 16 is a graph showing the sound insulation performance of FIG.

FIG. 17 is a sectional view showing a conventional ceiling structure.

18 is a graph showing sound insulation performance when the ceiling structure shown in FIG. 17 is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete slab 2 Hanging tool 3 Air layer 4 Interior ceiling material 5 Sound absorbing material

Claims (2)

[Claims] 1. A ceiling structure in which a ceiling material is provided below a ceiling slab made of a concrete slab or the like, wherein a sound absorbing material is provided only in a part including at least four corners of a periphery in contact with a wall of the ceiling surface. Characteristic soundproof ceiling structure. 2. The sound-absorbing material is made of a fiber aggregate having a fixed air permeability and a constant air resistance.
The soundproof ceiling structure described in the above.