JPH10311106A - Soundproof ceiling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively reduce noise such as floor impact noise throughout a wide range extending from a low frequency area to a high frequency area by a method wherein the whole of an air layer arranged between a ceiling slab and a ventilation material is filled with a sound absorbing material which is disposed. SOLUTION: A hanger 12 is suspended by an anchor bolt 11 buried in a ceiling slab 1, such as a concrete slab, and a venting material 3 is arranged at a furring strip holder fixed by the hanger 12 through an air layer 2. All the air layer 2, i.e. a space between the ceiling slab 1 and the venting material 3, is filled with a sound absorbing material 4, which is disposed. It is preferable that a substance made of a paper and having a honeycomb structure wherein a number of hexagonal venting holes longitudinally and laterally are opened in succession is used. This constitution effective reduces the generation of noise, such as floor impact noise, throughout a wide range extending from a low frequency to a high frequency.

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 use in apartment buildings such as condominiums with RC structures, gymnasiums, office buildings, libraries, classrooms in schools, and the like.

[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. 5, a conventional interior ceiling has an air space 101 below a ceiling slab 100 made of a concrete slab or the like.
, An interior ceiling material 102 is provided.

That is, in such a ceiling, the ceiling slab 10
A ridge receiver 105 is fixed to a hanger 104 fixed to a lower end of a bolt 103 projecting downward from 0, a ridge 107 is attached to the ridge receiver 105 with a clip 106, and the interior ceiling material 102 is attached to the ridge 107. Attached. 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. 6, 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 generated from the floor leaks from the gap between the ceiling and the body wall, and the sound insulation in the middle and high frequency bands 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, in the invention according to claim 1, a ventilation material is provided on a ceiling slab made of a concrete slab or the like, and a sound absorbing material is provided.

[0008]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a soundproof ceiling structure according to the present invention. The soundproof ceiling structure is an apartment house (for example, a hospital, a school,
(Can be used in gymnasiums, libraries and other buildings).

In the soundproof ceiling structure of this embodiment, as shown in FIG. 2, a hanger (hanger) 12 is hung by an anchor bolt 11 embedded in a ceiling slab 1 such as a concrete slab. A ventilation material 3 is provided on a field support 13 fixed by an air layer 2 through an air layer 2, and the air layer 2, that is, the ceiling slab 1 and the ventilation material 3 are provided.
The sound absorbing material 4 is filled and disposed in the entire space between them.

As the ventilating member 3, a paper honeycomb structure having a large number of hexagonal venting holes continuously opened in front, rear, left and right (especially having good rigidity and air permeability) is used. 3 is laid on the entire ceiling surface. The ventilation material 3 of this embodiment is fixed to the upper surface of the ridge 14 orthogonal to the ridge receiver 13 with an adhesive, and the side surface portion is similarly fixed to the wall surface portion with an adhesive.

Further, as shown in FIG. 2, a woven cloth (eg, jersey or the like) having good air permeability is provided on the lower surface side of the ventilation material 3.
5 is attached. In this embodiment, the upper surface is fixed to the field margin receiver. However, the present invention is not limited to this. For example, the upper surface may be fixed to the field edge or may be fixed to a sound absorbing material (in this case, however, in this case). It is necessary to take measures such as fixing the sound absorbing material to the ceiling side by appropriate means).

The sound absorbing material 4 of this embodiment has a thickness of 55 m.
A plurality of m-shaped fiber aggregates are used, and are disposed over the entire air layer 2 provided between the ventilation material 3 and the ceiling 1. This fiber aggregate is formed by forming a fiber molded body made of an aggregate of fibrous substances into a predetermined size.

The fiber molded article of this embodiment is made of short fibers having a fiber diameter distribution center of 30 denier or less, and has an average apparent density of 0.055 g / cm ³ (the average apparent density is 0.03 to 0.15 g). / Cm ³ is preferable). In addition, while 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 absorption characteristics, but a certain degree of air permeability is secured. .

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. Furthermore, short fibers opened from a cloth using these fibers can also be used.

The sound absorbing material 4 of this embodiment is merely filled between the (ceiling) surface of the slab ceiling 1 and the ventilation material 3 and is not particularly fixed. It may be attached by any suitable means, such as by directly bonding to the surface, or by using a mechanical means such as a concrete nail or a pin.

Therefore, according to this embodiment, since the sound absorbing material 4 is provided between the ceiling slab 1 and the ventilation material 3 to prevent the formation of the air layer 2, it is generated, for example, on the floor surface on the floor. It is possible to reduce the noise level of the low-frequency impact noise (caused by the resonance phenomenon of the spring component of the air layer 2 and the mass component of the ventilation material 3) caused by the floor impact noise of the weight source. In addition, even if the air layer 2 is formed, since the air layer 2 is provided with air permeability, the noise level at a low frequency can be similarly reduced.

Next, the soundproof ceiling structure of this embodiment was compared with a concrete base ceiling and a conventional ceiling (for example, as shown in FIG. 4) (all slabs having a thickness of 150 m).
m in a reverberation room. ), The results as shown in FIG. 3 were obtained for the heavy floor impact sound. From the results of this experiment, the JIS sound insulation grade was L-55 for concrete base and L-55 for the conventional ceiling structure.
60, in the soundproof ceiling structure of this embodiment, at least L-
It was confirmed that a sound insulation performance of 55 or more was obtained.

When a similar experiment was conducted for a lightweight floor impact sound, the results shown in FIG. 4 were obtained for the impact noise blocking performance. That is, regarding the JIS sound insulation grade, it was confirmed that the sound insulation performance of L-80 was obtained for the concrete base, L-65 was obtained for the conventional ceiling structure, and at least L-55 was obtained for the soundproof ceiling structure of this embodiment.

[0019]

As described above, according to the present invention, since the air-permeable material having a honeycomb structure having a high air permeability and the sound-absorbing material having a certain air permeability are used, the air spring component which has been conventionally generated is eliminated. It is possible to effectively prevent the floor impact sound (weight source) in the low frequency band caused by the mass component of the ceiling material.

At the same time, according to the present invention, the sound-absorbing material used has such a density (sealing property) that the floor impact sound on the floor does not leak into the room downstairs. It is also possible to prevent the occurrence of (light) floor impact noise in the middle and high frequency bands, thereby effectively reducing floor impact noise and other noises over a wide range from low to high frequencies. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a soundproof ceiling structure according to the present invention.

FIG. 2 is an enlarged sectional view showing the soundproof ceiling structure of FIG.

FIG. 3 is a graph showing a comparison of heavy floor impact sound insulation performance with a conventional ceiling structure and the like.

FIG. 4 is a graph showing a comparison of a lightweight floor impact sound insulation performance with a conventional ceiling structure and the like.

FIG. 5 is a sectional view showing a conventional ceiling structure.

FIG. 6 is a graph showing sound insulation performance when the ceiling structure shown in FIG. 5 is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceiling slab 13 Field support 2 Air layer 3 Ventilation material (honeycomb structure) 4 Sound absorption material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazomo Murakami 2-14-13 Sasashita, Konan-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Masaru Tsukada 150-7, Kashio-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Kenji Inaba 966 Nishikubo, Chigasaki-shi, Kanagawa (72) Inventor Michitaka Takeshita 3-18-15 Nakamachi, Koganei-shi, Tokyo

Claims (1)

[Claims] 1. A soundproof ceiling structure characterized in that a ventilation material is provided on a ceiling slab made of a concrete slab or the like and a sound absorbing material is provided.