JPH11152842A - Soundproof ceiling construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sound insulation property from deteriorating due to low frequency band resonant transmission and reduce noise in a medium/high frequency range by arranging sound absorbing material on one parts containing four corners in the circumference of a ceiling plate contacted with walls, and filling it so that the section is formed into an N-gonal shape. SOLUTION: On a ceiling slab made of a concrete slab 1 and the like, by hangers hung down with anchor bolts, an internally faced ceiling material 4 is provided on one part of the ceiling face through an air layer 3. In this ceiling construction a sound absorbing material 5 is arranged on only one part containing at least four corners in the circumference of the ceiling material 4 contacting walls. The sound absorbing material 5 is filled so that the section is formed into an N-gonal shape (where N is an integer number of five or more). As for the sound absorbing material 5, a material constituted of a fiber aggregate having a fixed gas permeability and a ventilation resistance is used. Then, the sound insulation property against heavy weight source floor impact sound by low frequency band resonant transmission can be prevented from deteriorating, and simultaneously light weight source floor impact noise in the medium/high frequency range can be reduced.

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 in which a sound absorbing material is provided below a ceiling slab made of a concrete slab or 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. 20, a conventional interior ceiling has an air space 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. 21, sound insulation is improved in the middle and high frequency bands, but is reduced 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 that can prevent noise in a middle and high frequency band (light source floor impact) while preventing a decrease in sound insulation.

[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, at least one of the periphery of the ceiling material that is in contact with a wall is provided. A sound absorbing material is provided only in a part including the four corners, and this sound absorbing material is N-shaped in cross section (where N is 5
(The above integer).

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, which can be applied to an apartment house (for example, a hospital, a school, a gymnasium, a library, and other buildings. A) has been applied to the ceiling. In the soundproof ceiling structure of the first embodiment, a part of the ceiling surface (via the air layer 3) is provided on a part of the ceiling surface by a suspender 2 suspended from a ceiling slab 1 such as a concrete slab by an anchor bolt (not shown). Material 4 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.

[0010] The interior ceiling material 4 is provided in a portion other than the portion where the sound absorbing material 5 is provided on the ceiling surface, that is, as shown by a white portion in FIG. (The ratio of the occupied area is 80%). In this embodiment, a gypsum board (plaster board PB12t manufactured by Yoshino Gypsum Co., Ltd.) having a thickness of 12 mm is used, but the present invention is not limited to this. Moreover, 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), the interior ceiling material may be directly attached to the concrete slab.

The sound-absorbing material 5 of this embodiment is constituted by disposing a fiber assembly, which will be described later, and is disposed only at the four corners of the ceiling, as shown in black in FIG. . In addition, as shown in FIG. 3, the four corners and the central portion may be used, and as shown in FIG. 4, the center may be a pair of opposite sides facing each other and the central portion of the ceiling surface. In addition,
This sound absorbing material 5 may be formed as a unit.

As shown in FIGS. 5 and 6, this fiber assembly is formed by forming a fiber molded body made of an assembly of fibrous substances into an N-gonal cross section in the longitudinal direction (where N is an integer of 5 or more). Fill so that In particular, this filling state is configured such that the surface not in contact with the wall is a multi-plane, and is formed to have a predetermined size and a polygonal cross section. As the fiber molding, the average apparent density 0.055 g / cm ³ short fibers center following 30 denier fiber diameter distribution as the material (average apparent density is preferably from 0.03~0.15g / cm ³⁾
And formed into a fiber aggregate. By using short fibers of 30 denier or less and suppressing the apparent density within a predetermined range, the airflow resistance inside the fiber molded body is increased, and the sound absorption characteristics are improved. 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. In addition, for example, as shown in FIG.
Attachment can be made by any appropriate means, such as attachment using mechanical means such as 1 or a pin. The sound absorbing material is not limited to the fiber aggregate, but may be a material having a similar effect such as rock wool or glass wool.

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. That is, for example, due to a weight source floor impact sound generated on the floor above the floor (air layer 3
(A resonance phenomenon of the spring component and the mass component of the interior ceiling material 4) reduces the noise level of the low-frequency impact sound.

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).
(Performed in a 0 mm reverberation chamber). With respect to the performance of blocking light floor impact noise, results as shown in FIG. 8 were obtained. Regarding the JIS sound insulation grade, sound insulation performance of L-80 was confirmed for concrete base, L-65 for the conventional ceiling structure, and at least L-55 for the soundproof ceiling structure of this example.

Further, when the same experiment was carried out on a heavy floor impact sound, as shown in FIG. 9, L-55 in a concrete base, L-60 in a conventional ceiling structure, and at least L-60 in a soundproof ceiling structure of this embodiment. Sound insulation performance of L-55 or more was confirmed.

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. 10, of the four sides (two sets of sides facing each other) of the ceiling surface, the entirety of one set of sides (in a blacked area). Shown), and a sound absorbing material 5 is provided. 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. 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 in 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.

The arrangement of the sound absorbing material 5 is as follows.
The present invention is not limited to the second embodiment, and FIG.
As shown in FIG. 12, a plurality of (two) pairs are arranged in parallel along the same direction in addition to the entire opposite side of the set on one side, as shown by a black portion in FIG. It is also possible to provide a substantially H-shape so as to connect the whole of the opposite side of the one set and these at an intermediate portion. 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. 13, as shown by the black portions, the X-shaped sound absorbing material 5 is provided in the diagonal direction including the four corners of the ceiling surface. In addition, the interior ceiling material 4 is installed on all ceiling surfaces other than the portion where the sound absorbing material 5 is provided. Also in this embodiment, the method of attaching the interior ceiling material 4 and the sound absorbing material 5 is the same as the first method.
Although the same ones as those in the embodiment are used, the present invention is not 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.

Further, in the first to third embodiments and the later-described embodiments, an air layer is not formed between the sound absorbing material 5 and the ceiling slab 1, but an air layer may be formed. I do not care. That is, as shown in FIG. 14, the sound absorbing material 5 is fitted into the rail-shaped suspension member 22 attached to the ceiling slab 1, or as shown in FIG. Sound absorbing material 5 on wooden frame base, etc.)
May be mounted or attached to a field support (not shown).
Alternatively, as shown in FIG. 16, an appropriate attachment member 24 may be attached to the surrounding wall without being hung from the ceiling slab 1 and fixed to the attachment member 24.

Further, another embodiment according to the present invention will be described. In the soundproof ceiling structure shown in FIG. 17, a resonator 7 is provided on a part of the interior ceiling material 4. By adopting such a structure, the heavy floor impact noise can be reduced by using FIG.
As shown in Table 2, the sound insulation performance of L-55 was obtained on the concrete base, the soundproof ceiling structure without the resonator was L-55, and the soundproof ceiling structure with the resonator of this example was L-50. Further, as shown in FIG. 19, the light floor impact sound is L-80 for a concrete base, L-55 for a soundproof ceiling structure without a resonator, and L-55 or more for a soundproof ceiling structure with a resonator of this embodiment. The sound insulation performance of was obtained.

[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, the floor impact noise can be prevented over a wide range from the low frequency range to the high frequency range. Etc. can be effectively reduced.

Further, according to the present invention, since the sound absorbing material is filled so that its cross-sectional shape is N-gonal (where N is an integer of 5 or more), the sound absorbing material is filled with the same volume. However, a large surface area can be ensured, in other words, a material excellent in sound absorbing effect can be provided by using a small amount of sound absorbing material (at a low cost).

[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 an explanatory diagram showing a configuration of another modification of the fiber assembly.

FIG. 6 is a schematic sectional view showing the configuration of another modification of the fiber assembly.

FIG. 7 is a sectional view showing another method of attaching the sound absorbing material.

FIG. 8 is a graph showing a comparison of a lightweight floor impact sound insulation performance with a conventional ceiling structure and the like.

FIG. 9 is a graph showing a comparison of heavy floor impact sound insulation performance with a conventional ceiling structure and the like.

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 arrangement of another sound absorbing material.

FIG. 13 is an explanatory view showing the arrangement of another sound absorbing material.

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

FIG. 15 is an explanatory view showing a ceiling structure for installing another sound absorbing material.

FIG. 16 is a sectional view showing a ceiling structure in which another sound absorbing material is installed.

FIG. 17 is a cross-sectional view showing a soundproof ceiling structure provided with a resonator.

FIG. 18 is a graph showing heavy floor impact sound insulation performance of the ceiling structure shown in FIG. 17;

FIG. 19 is a graph showing the lightweight floor impact sound blocking performance of the ceiling structure shown in FIG. 17;

FIG. 20 is a sectional view showing a conventional ceiling structure.

FIG. 21 is a graph showing sound insulation performance when the ceiling structure shown in FIG. 20 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 5A Sound absorbing unit

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 at least a part including at least four corners of a periphery in contact with a wall of the ceiling material. Is filled in an N-section cross section (where N is an integer of 5 or more). 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.