JPH08109687A - Sound-insulating triple wall body structure - Google Patents

Abstract

PURPOSE: To insulate a power flow to a sound producing room and a sound receiving room efficiently in a wall structure partitioning the sound producing room and the sound receiving room. CONSTITUTION: In a hollow wall structure partitioning a sound producing side 1 as a noise source and a sound receiving side 2, from which a sound leaks, a hollow wall body 3 is formed of three face materials 4, 5, 6, and the thickness of a hollow layer 7 on the sound producing side 1 is made thicker than that of a hollow layer 8 on the sound receiving side. Accordingly, directional properties to the loss of a power flow are produced, and the hollow layer 7 on the sound generating side is made thicker than the hollow layer 8 on the sound receiving side, thus improving sound-insulating performance to the sound receiving side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall structure having excellent sound insulation performance, and more particularly, to a sound insulation triple wall structure having a triple wall structure.

[0002]

2. Description of the Related Art Conventionally, regarding a wall body using a plurality of face materials, a number of techniques for a sound insulating wall body structure have been filed for the purpose of improving the sound insulation performance.

As a technology for this sound insulation wall structure, the actual construction sho 60
As disclosed in Japanese Patent No. 102311, a vibration damping / insulating plate is attached to an existing hollow wall, that is, a hollow wall formed by a parallel plate so as to be hollow. A sound-insulating wall structure with improved sound-insulating performance by adding a sound-insulating effect, or as disclosed in Japanese Patent Publication No. 4-25139, a gypsum board with different surface densities provided with hollow layers before and after a concrete slab wall with an adhesive. A sound insulation structure having improved sound insulation performance by adhering a surface material such as is proposed.

[0004]

However, in these prior arts, the sound source incident on the original wall structure is regarded as a vibrating body, and the sound incident on the wall structure is converted into energy in the air layer as an intermediate layer. It is a technology to reduce the noise, and no technology to improve the sound insulation performance by the structure of the wall itself is shown.

On the other hand, research has been conducted on predicting the transmission loss of a hollow double-structured wall against noises and the like (literature name: "Improved SE of hollow double-wall having various geometric sectional structures. Theory and Experiment of Transmission Loss Based on Method A ”, Journal of Acoustical Society of Japan, Vol. 36, No. 9, 1980, PP 447-458).

Normally, S. E. FIG. Method A (Statistical Energy
The principle of analysis is that many modes within a certain frequency band are originally energy-exchanged with each other based on the diffuse sound field of random incidence, and eventually, in the form of a kind of averaged energy density, from the sound source side to the sound receiving side. When the power flow is measured as transmission loss using a bandpass filter under the reverberation room-reverberation sound, the theoretical value and the experimental value can be matched as they are. Has a double-walled low-frequency resonance effect, and the predicted value in the low-frequency range differs considerably from the actual value.

In the above research, S. E. FIG. Method A (Statistica
S. Introducing a model by improving low frequency resonance, which was a problem of Energy Analysis). E. FIG. It has been confirmed that the transmission loss of the hollow double wall by method A can be sufficiently predicted.

In the above research, the present inventor has found that the double wall low frequency resonance, that is, the transmission loss due to the resonance effect due to both the panel mass and the air stiffness in the hollow layer, is relatively large, and the thickness of the hollow layer is large. Focusing on the fact that the transmission loss changes due to the above, the present invention has completed the present invention by finding a sound-insulating triple wall body that can efficiently reduce the power flow when applied to the triple wall.

The present invention has been made to solve the above problems, and in a wall structure that divides a sound source chamber and a sound receiving chamber,
An object of the present invention is to provide a sound insulation triple wall structure capable of efficiently insulating the power flow to the sound source room and the sound receiving room.

[0010]

In order to achieve the above object, the invention according to claim 1 is a hollow wall structure for partitioning a sound source side which is a noise source and a sound receiving side through which a sound leaks, in which a hollow wall is provided. Formed with three face materials, the thickness of the hollow layer on the sound source side is
It is characterized in that it is thicker than the thickness of the sound receiving side hollow layer.

The invention according to claim 2 is based on the invention according to claim 1, and the thickness of the hollow layer on the sound source side and the thickness of the hollow layer on the sound receiving side are about 5: 1 to about 3: 1. It is characterized by having done.

[0012]

According to the first aspect of the present invention, by changing the thickness of the hollow layer formed of the three face materials, the directivity is generated with respect to the loss of the power flow, and the hollow layer on the sound source side is received. By making it thicker than the hollow layer on the sound side, the sound insulation performance to the sound receiving side can be improved.

According to the second aspect of the present invention, the thickness of the hollow layer is set to about 5: 1 to about 3: 1 so that the sound insulation performance is improved by about 2 to 4 dB in the 1 to 2 kHz band. Can be achieved.

[0014]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is a sound source side which is a noise source (listening to a stereo, playing an instrument, etc.), and 2 is a sound receiving side through which the sound leaks, while the triple wall 3 of the present invention is provided therebetween. Is provided to divide the both sides 1 and 2.

This triple wall body 3 includes a sound source side 1 to a sound receiving side 2
To the end, it is composed of three single-layer face materials 4, 5, 6 (face materials made of a single single-layer material that is not bonded to other materials, etc.), and is appropriately held by a spacer material 9 at appropriate intervals.

A sound source side hollow layer (air layer) 7 is formed between the sound source side surface material 4 and the center surface material 5, and a sound receiving side hollow layer (air layer) is formed between the center surface material 5 and the sound receiving side material 6. (Air layer) 8 is formed, and both hollow layers 7 and 8 have a thickness d7 of the sound source side hollow layer 7,
D7 vs. d such that the thickness is larger than the thickness d8 of the sound receiving side hollow layer 8.
8 is formed to be approximately 5: 1 to approximately 3: 1 and preferably 4: 1.

In the above, the noise on the sound source side 1 is transmitted as a power flow from the triple wall 3 to the sound receiving side 2. In this case, since the thickness d7 of the sound source side hollow layer 7 is formed to be sufficiently larger than the thickness d8 of the sound receiving side hollow layer 8, the sound insulation performance can be improved. That is, the incident sound that enters the sound source side surface material 4 from the sound source side 1 is transmitted to the sound receiving side material 2 from the sound receiving side material 6 while the respective surface materials 4, 5 and 5.
6 and the sound source side hollow layers 7 and 8 are damped by the air spring action, and this becomes a transmission loss, but the face materials 4, 5 and 5 of the sound source side sound receiving side hollow layer 7 and the sound receiving side intermediate layer 8 No. 6 causes double wall low frequency resonance as described above. At this time, the central surface material 5
Vibrations are the same and the energy on the incident side (sound source side 1) is higher than that on the emission side (sound receiving side). Therefore, by making the thickness d7 of the sound source side hollow layer 7 thicker than d8 A large transmission loss due to the heavy wall low frequency resonance can be obtained, and as a result, the sound insulation performance can be improved.

FIG. 2 shows a comparative example of FIG. 1. The difference from FIG. 1 is that the thickness d7 of the sound source side hollow layer 7 is d7 with respect to the thickness d8 of the sound receiving side hollow layer 8. Pair d8 is a one to four.

Example 1 The triple wall body 3 of the present invention shown in FIG. 1 and the triple wall body 3 as a comparative example shown in FIG. 2 were tested under the same conditions, and the results are shown in FIGS. 4 shows.

First, in FIG. 3, the total thickness of the triple wall body 3 is 100 m.
m, a single-layer surface material with a triple wall structure, and the total thickness is 2 in Fig. 4.
00 mm, which is also a single-layer face material and has a triple wall structure.

3 and 4, a shows a graph of transmission loss at the frequency of the embodiment of FIG. 1, and b shows a graph of the comparative example of FIG.

From FIGS. 3 and 4, in Example a in which the thickness d7 of the sound source side hollow layer 7 of FIG. 1 is 4 to 1 with respect to the thickness d8 of the sound receiving side hollow layer 8, Comparative Example b It can be seen that the sound insulation performance is improved by about 2 to 4 dB in the high-pitched sound portion (1 to 2 kHz band) as compared with the case of 1: 4, compared with the case of the comparative example b in FIG.

[Embodiment 2] As shown in FIG. 5, the face material 4 on the sound source side 1 is not a single-layer face material but a multi-layer face material 4a, 4b, and the thickness d7 of the sound source side hollow layer 7 is The thickness d8 of the sound side hollow layer 8 is 4: 1.

Similarly, as a comparative example, the face material 4 on the sound source side 1 is not a single-layer face material but is formed of multi-layer face materials 4a and 4b, and the thickness d7 of the sound source side hollow layer 7 is the same as that of the sound receiving side hollow layer 8. A triple wall body 3 having a total thickness of 200 mm with a thickness of d8 of 1: 4 was prepared, and the results of measuring the sound insulation performance of the embodiment of FIG. 5 are shown in FIG.

As can be seen from FIG. 7, the embodiment a of FIG.
Compared with the comparative example b of FIG. 6, it is excellent in sound insulation performance of 2 to 4 dB in the treble part.

As described above, by making the position of the central surface member 5 from the sound source side 1 to the sound receiving side 2 and making the thickness of the sound source side hollow layer 7 larger than the thickness of the sound receiving side hollow layer 8, It is possible to improve the sound insulation performance of the high-pitched sound portion by keeping the distance close to each other while avoiding the resonance transmission.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific structure is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Also included in the present invention. For example, a damping plate may be attached to the face members 4 to 6 of the above embodiment, particularly the sound source side member 4.

[0029]

In summary, according to the present invention, the following excellent effects can be obtained.

(1) According to the first aspect of the present invention, by changing the thickness of the hollow layer formed of the three face materials, the directionality with respect to the loss of the power flow is generated, and the hollow layer on the sound source side is generated. Is thicker than the hollow layer on the sound receiving side, the sound insulation performance to the sound receiving side can be improved.

(2) According to the invention described in claim 2, by setting the thickness of the hollow layer to be approximately 4 to 1, in the 1 to 2 kHz band,
The sound insulation performance can be improved by about 2 to 4 dB.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing a comparative example of FIG.

3 is a total thickness of the embodiment of FIG. 1 and the comparative example of FIG.
It is a figure which shows the transmission loss in the frequency of the sound source of the triple wall body of m.

4 is a total thickness of 200 m of the example of FIG. 1 and the comparative example of FIG.
It is a figure which shows the transmission loss in the frequency of the sound source of the triple wall body of m.

FIG. 5 is a sectional view showing another embodiment of the present invention.

6 is a cross-sectional view showing a comparative example of FIG.

7 is a total thickness of 200 m of the example of FIG. 5 and the comparative example of FIG.
It is a figure which shows the transmission loss in the frequency of the sound source of the triple wall body of m.

[Explanation of symbols]

 1 sound source side 2 sound receiving side 4, 5, 6 face material 7 sound source side hollow layer 8 sound receiving side hollow layer

Claims (2)

[Claims] 1. In a hollow wall structure for partitioning a sound source side which is a noise source and a sound receiving side from which sound is leaked, the hollow wall is formed by three face materials, and the thickness of the hollow layer on the sound source side is A sound-insulating triple wall structure characterized in that it is thicker than the sound-receiving side hollow layer. 2. The sound insulating triple wall structure according to claim 1, wherein the thickness of the hollow layer on the sound source side and the thickness of the hollow layer on the sound receiving side are approximately 5: 1 to approximately 3: 1.