JPH0925671A - Resonance-type sound-absorbing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sound-absorbing performance such as in a highway, an underpass, etc., by partitioning off a space between the front board and the rear board with a partition board at every slit to arrange a plurality of resonance rooms, and bending the inside hollows of the resonance rooms. SOLUTION: A plurality of slits are arranged on the front board 1 to mount the rear board 3 on the rear of the front board 1, and a space between the front board 1 and rear board 3 is partitioned with a partition board 4 at every slit 2 to arrange a plurality of resonance rooms 5. In that case, the partition board 4 between the resonance rooms 5 is bent to bend the inside hollow of each of the resonance rooms 5. Noises transmitted from the slits 2 and resonated with each other in the resonance rooms 5 to damp are complicatedly reflected in the inside hollows to interfere with them, and the damping caused by resonance is more accelerated. A plurality of resonance rooms 5 have the different size of depth at every slit 2, noises having different frequencies resonate at every resonance room 5, and a resonance sound absorbing plate absorbs a broad range of noise from low frequency zone to high frequency zone.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a railway, an elevated road,
The present invention relates to a resonance type sound absorbing plate which is attached to a lower portion of an elevated structure such as a bridge or an elevated road, a side surface of a trench or a semi-underground road, a highway, a wall surface of a general building or a ceiling surface of an underpass.

[0002]

2. Description of the Related Art Conventionally, as this type of sound absorbing plate, for example, Japanese Patent Laid-Open No. 6-129029 discloses a sound absorbing and sound insulating panel hollow unit made of concrete and having two or more kinds of resonance chambers having different cross-sectional areas. ing. In addition, Tokubo Sho 5
Japanese Unexamined Patent Publication No. 4-2006 discloses a noise control device in which a large number of hollow units each having a bent central portion are stacked.

[0003]

However, the sound-absorbing / sound-insulating panel described in JP-A-6-129029 has a drawback that it is heavy and inferior in workability because it is made of concrete. Further, there is a problem that the resonance chamber has a rectangular shape with a horizontally long cross section, and the sound incident from the sound absorbing hole directly reaches the depth of the resonance chamber and is difficult to be attenuated. In addition, Tokubo Sho 5
The noise control device described in Japanese Patent Laid-Open No. 4-2006 has a problem that the hollow unit is bent, and a large number of hollow units whose central portion is bent are open at both ends, so that the noise control effect is poor. Therefore, the present invention solves the above problems and provides a resonance type sound absorbing plate having an excellent sound absorbing effect.

[0004]

In order to achieve the above object, the present invention has the following arrangement. That is, in the sound absorbing structure according to the present invention, the back plate is provided behind the front plate in which the plurality of slits are formed, and the space between the front plate and the back plate is partitioned by the partition plate for each slit to form a plurality of resonance chambers. Is formed, and the inner wall of each resonance chamber is bent.

[0005]

According to the resonance type sound absorbing plate of the present invention, the damping effect in the closed resonance chamber is further promoted by the irregular reflection due to the bent inner wall of the resonance chamber. That is, the sound waves incident in the closed resonance chamber usually reverberate in the resonance chamber and resonate with each other to be attenuated.However, since the inner wall of the resonance chamber is bent, diffuse reflection is promoted and attenuation due to resonance is also caused. It is accelerated, the damping effect in the resonance chamber is increased, and the sound absorbing performance is improved.

[0006]

Embodiments of the present invention will now be specifically described with reference to the drawings. First, FIG. 1 is a sectional view showing an embodiment of the resonance-type sound absorbing plate of the present invention, in which 1 is a front plate having a plurality of slits 2 formed therein. A back plate 3 is provided behind the front plate 1. A plurality of resonance chambers 5 are formed by partitioning the slits 2 between the front plate 1 and the back plate 3 by a partition plate 4.

In the resonance chambers 5, the partition plates 4 between the resonance chambers 5 are bent, and the inner cavity of the resonance chambers 5 is bent. Further, the position of the back plate 3 is different for each resonance chamber 5, and the distance between the front plate 1 and the back plate 3, that is, the depth dimension is different.

In the embodiment of FIG. 2, the adjacent slits 2, 2 are
An enlarged portion 41 is formed on a part of the front plate 1 and a front end portion of a partition plate 4 connected to the front plate portion, and a dovetail groove 42 is formed on the inner wall of another resonance chamber 5. Ant groove 4
2 is detachably fitted. If the partition plate 4 is detachably fitted to the inner wall of the resonance chamber 5, the combination of the enlarged portion and the dovetail groove does not matter.

In the embodiment shown in FIG. 3, a second back plate 6 is further provided behind the resonance chamber 5, and a second resonance chamber 7 is formed between the resonance chamber 5 and the second back plate 6. In this case, when a small hole 8 is formed in the back plate 3 between the resonance chamber 5 and the second resonance chamber 7 as shown in FIG. 7 and is further absorbed in the second resonance chamber 7, which improves the sound absorbing performance, which is preferable.

[0010]

As described above, in the resonance type sound absorbing plate of the present invention, the back plate is provided behind the front plate having a plurality of slits, and the front plate and the back plate are separated by a partition plate for each slit. As a result, multiple resonance chambers are formed, and the lumens of each resonance chamber are bent, so the noise that is incident from the slit, resonates in the resonance chamber, and attenuates is complicated by the bent lumens. The sound is reflected and interferes with each other, the attenuation due to resonance is further promoted, and the sound absorbing effect is further enhanced.

Further, since the plurality of resonance chambers have different depth dimensions for each slit, noises having different frequencies resonate in each resonance chamber, and the noises in a wide range from a low frequency region to a high frequency region as a whole. Is absorbed and the sound absorption performance is excellent.

Further, when a part of the front plate separated by adjacent slits and a partition plate connected to the front plate part are detachably attached to another resonance chamber inner wall, the front plate has a different shape. By preparing the portion and the partition plate, it is possible to obtain an optimum resonance chamber corresponding to the noise source, and it is possible to effectively absorb noise by focusing on noise in a specific frequency range.

Further, when a second back plate is further provided behind the resonance chamber and a second resonance chamber is formed between the resonance chamber and the second back plate, the resonance is not absorbed in the resonance chamber. The residual noise is resonated and attenuated in the second resonance chamber to further improve the sound absorbing performance, and when the resonance chamber and the second resonance chamber are communicated with each other by the opening, the noise not absorbed in the resonance chamber The remainder smoothly moves to the second resonance chamber, and the sound absorbing performance is further improved, which is preferable.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a resonance-type sound absorbing plate of the present invention.

FIG. 2 is a partially cutaway perspective view showing another embodiment of the resonance-type sound absorbing plate of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the resonance type sound absorbing plate of the present invention.

FIG. 4 is a sectional view showing still another embodiment of the resonance-type sound absorbing plate of the present invention.

FIG. 5 is a cross-sectional view showing a conventional sound absorbing plate.

FIG. 6 is a cross-sectional view showing a conventional sound absorbing plate.

[Explanation of symbols]

 1 Front Plate 2 Slit 3 Rear Plate 4 Partition Plate 41 Enlarged Part 42 Dovetail 5 Resonance Chamber 6 Second Rear Plate 7 Second Resonance Chamber 8 Small Hole

Claims (5)

[Claims] 1. A back plate is provided behind a front plate having a plurality of slits formed therein, and a partition plate is provided between the front plate and the back plate to divide the slits into a plurality of resonance chambers. A resonance type sound absorbing plate in which the inner cavity of the resonance chamber is bent. 2. The resonance type sound absorbing plate according to claim 1, wherein the plurality of resonance chambers have different depth dimensions for each slit. 3. A resonance plate according to claim 1, wherein a part of the front plate partitioned by adjacent slits and a partition plate connected to the front plate part are detachably attached to another resonance chamber inner wall. Resonance type sound absorbing board. 4. The resonance-type sound absorbing plate according to claim 1, further comprising a second back plate provided behind the resonance chamber, and the second resonance chamber is formed between the resonance chamber and the second back plate. . 5. The resonance type sound absorbing plate according to claim 4, wherein the resonance chamber and the second resonance chamber are communicated with each other through an opening.