JPH11327563A - Sound insulation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To embody a sound insulation member which is light in weight and is excellent in sound insulation effect, constructability, appearance and durability by joining a rust prevention treated thin steel sheet with its weight fixing surface faced on an inner side to a specific rigid frame so as to cover at least one opening of this frame, thereby constituting the member. SOLUTION: This sound insulation member 4 is constituted by joining the rust prevention treated thin steel sheet 1 of 0.05 to 0.3 mm in thickness fixed with the plural weights 2 regularly at specified intervals on its one surface with its weight fixing surface faced on the inner side to the rigid frame 3 of >=40 mm in body length so as to cover at least its one opening. While the weights of this case are not restricted in their material quality, mass, shape, etc., weights, such as blanked materials of, for example, thick steel plates, which are easily fixable to the thin steel sheet, are preferably used. Then, the direct contact of a constructor or the members with the weights 2 at the time of construction, storage or transportation does not occur any more and the member satisfactory in terms of appearance may be obtd. by executing the construction to position the side not fixed with the weights 2 to the outer side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a "sound insulation member" for shielding noise to reduce the sound volume.

[0002]

2. Description of the Related Art Conventionally, as a method of improving the noise environment by reducing the arrival noise, there is a sound insulation method which uses a compression molded composite board, a wall, a sash and the like to prevent sound transmission. "Sound absorbing type", which absorbs sound by converting sound energy into heat energy in a porous material such as glass wool or rock wool, has been generally adopted. However, these systems are disadvantages which have been pointed out particularly when applied as interior materials such as partitions for structural materials, but have a problem that it is difficult to obtain a sufficient noise reduction effect due to restrictions such as weight and volume. .

In addition to these methods, noise reduction measures utilizing sound wave interference have also been proposed. Recently, the so-called "active control," in which a penetrating sound wave is detected by a sensor and the phase thereof is reversed, A sound-absorbing type in which a sound wave is emitted from a speaker to cancel the sound has been put to practical use. This method was made possible by the recent development of digital technology, but it requires a lot of cost to construct facilities and the system becomes extremely complicated. Was not realistic.

Therefore, the present applicants have previously described "a vibration of the whole thin film" which is formed of a rigid thin film having weights fixed regularly on the surface thereof at substantially constant intervals and which is caused by an incident sound wave. Japanese Patent Publication No. 7-19154 proposes a "sound insulation device comprising a thin film" in which the vibration of the portion divided by the weight is canceled out to attenuate the vibration of the thin film and thereby reduce the noise. reference).

FIG. 5 is an explanatory view of one example of the "sound insulation device comprising a thin film" proposed above, in which a weight 2 'is regularly arranged on a rigid metal thin film 1' with a substantially constant interval a. Is shown in FIG. The "sound insulation device made of a thin film" is used, for example, by being stretched over a rectangular cylindrical frame member 3 '.

FIG. 6 is an explanatory view of the principle of noise reduction of the above-mentioned "sound insulation device comprising a thin film".
FIG. 6A is a plan view, and FIG. 6B is a side view. FIG.
The same phase split vibration mode as shown in (c) (the frequency of this time is f _1). FIG. 6D shows a vibration mode of the thin film when no weight is provided. On the other hand, the vibration mode of the whole thin film (the frequency at this time is f ₀₎ of the vibrational mode as shown in FIG. 6 (e). Then, in the frequency band between f ₀ and f _1, the vibration mode as shown in FIG. 6E changes from the vibration mode as shown in FIG. 6C to the vibration mode as shown in FIG. As shown in ()), a phenomenon occurs in which the vibration of the entire thin film becomes extremely small. As described above, even if a sound wave is incident on the thin film, if the vibration of the thin film is small, the radiation of sound from the thin film is also small, so that the transmitted sound is extremely small and a remarkable sound insulation effect is achieved. On the other hand, when the weight is not provided, the vibration mode of the entire thin film is a superposition of the vibration mode of FIG. 6E and the vibration mode of FIG. As a result, a remarkable sound insulation effect as described above is not provided.

[0007] The above is the principle of noise reduction of the "sound insulation device comprising a thin film" which has been proposed earlier. For example, when this is used as an exterior material of a building, the thin film is used in order to improve workability such as the weight falling off or the thin film being easily damaged at the time of construction, and to improve rust prevention and design. He came to recognize that there were problems with the design and construction man-hours of the whole building, such as the need to attach exterior panels after assembly. In addition, although it is a particularly important finding, we also experienced that in some construction cases, the same sound insulation effect as expected could not be obtained even when the same thin film sound insulation device (thin film with a fixed weight) was used. .

In view of the above, an object of the present invention is to realize a sound insulating member which is lightweight and has sufficiently excellent sound insulating effect, workability, appearance and durability.

[0009]

In order to achieve the above object, the present inventors have further developed a "sound insulation device made of a thin film as proposed above" which can obtain a high sound insulation effect with a particularly lightweight and simple structure. As a result of examination from various angles, the following new findings were obtained.

A) The “thin film in which a plurality of weights are fixed on the surface (hereinafter, also simply referred to as a“ thin film ”)”, which can be expected to have a very high sound insulation effect despite its simple structure. Yes, when steel sheet is applied to the thin film material, it becomes extremely useful, for example, as a sound insulation member for buildings in terms of durability and price, but its sound insulation effect has a considerable effect on the thickness of the thin film material. Therefore, a stable sound insulation effect cannot be ensured without adjusting the thickness of the thin film material.

B) It should be further noted that the "thin film" proposed above is joined to a frame member (panel) such as a square tube in a tambourine shape or a drum shape when used as an exterior material of a building, for example. In this case, the air layer in the frame member greatly affects the sound insulation effect. That is, if the thickness of the air layer in the frame member is small, the air layer acts as a spring, causing a low-frequency-range resonance transmission phenomenon, resulting in a reduction in sound insulation performance. This is one of the major reasons why the effect of the previously proposed "sound insulation device comprising a thin film" was not stabilized. In order to stabilize the sound insulation effect of the device in a high region, the thickness of the air layer in contact with the thin film was required. Adjustment is essential.

C) In order to improve the workability of the sound insulation construction using the “thin film” proposed above, it is necessary to adopt a member configuration that prevents direct contact with the weight at the time of construction. It is effective to fix the weight to the thin film on only one side and to join the thin film in advance to the frame with the weight fixed surface inside, and in this way, the thin film and the frame The sound insulation member that is fixed to the body is stored, transported,
All of the constructions have advantageous results.

D) Further, in the above-mentioned sound insulating member joined to the frame with the weight fixing surface of the thin film on the inside, if the construction on which the weight is not fixed is located on the outside, the appearance is also reduced. Satisfactory, and furthermore, by using a thin film that has been subjected to rust prevention treatment such as plating treatment, chemical conversion treatment, painting, etc., it is possible to construct a building with sufficiently excellent design and durability. Will be possible.

The present invention has been completed on the basis of the above findings and the like. As shown in FIG. 1 (a) is a perspective view and (b) is a longitudinal sectional view, as shown in FIG. A rust-proof treated thin steel plate 1 having a thickness of 0.05 to 0.3 mm, on which a plurality of weights 2 are regularly fixed on one surface at regular intervals, has a body length of 40 mm or more with the weight fixing surface inside. In that the rigid frame 3 is joined to at least one opening of the rigid frame 3 so as to cover the opening.

Here, the "weight" refers to the material, mass,
It does not matter what shape or the like, but it is preferable to use a material that can be easily fixed to a thin steel plate such as a punched material of a thick steel plate. Further, the method of fixing the weight to the thin steel plate and the interval are not particularly limited. For example, a sufficient effect can be obtained even when an adhesive is used for fixing the weight. In the present invention, the fixed interval of the weights is defined as “constant interval”. However, the “constant interval” in the present invention is not strictly meaning but includes “almost constant interval”. Will be apparent from the principle of the sound insulation effect described above with reference to FIG.

Furthermore, the rust-proofing method and dimensions of the "rust-proof thin steel sheet" are not particularly limited. For example, rust-proofing methods for thin steel sheets include zinc plating, tin plating,
A plating treatment such as a Zn-Al alloy plating, a chemical conversion treatment such as a chromate treatment, a coating, or the like can be employed alone or in combination. In the case where a punched material of a steel plate or the like is used as the “weight”, a similar rust preventive treatment may be applied to these if necessary.

The shape of the "rigid frame" for joining thin steel plates is not particularly limited as long as it has a body defining an air layer, and it is not limited to a polygonal rectangular tube or, in some cases, a cylindrical shape. May be. However, if the joining property of the thin steel sheet and the workability of, for example, the exterior material and the interior material of the building are taken into consideration, the U-shaped sectional shape having the flange at the end as shown in FIG. It is preferable to apply a panel having a U-shaped cross section. The material of the “rigid frame” is not particularly limited, but it is advantageous to use a steel material from the viewpoint of cost and workability. When such a steel frame is used, it is recommended that the steel be subjected to the same rust prevention treatment as that of a thin steel plate. Also, the method of joining the thin steel sheet to the rigid frame is not limited to a specific method, and a suitable effect can be obtained by any of joining using a double-sided adhesive tape, mechanical joining such as riveting, welding, and the like. be able to. The joining of the thin steel plate to the rigid frame may be performed in a tambourine shape at one end of the rigid frame, or may be performed in a drum shape at both ends of the rigid frame, and is determined according to an application situation. .

Hereinafter, the sound insulating member according to the present invention will be described together with its operation.

As described above with reference to FIG. 6, when a sound wave is incident on a thin film on which a plurality of weights are regularly fixed at regular intervals on the surface, the "whole thin film"
And the "parts divided by the weight of the thin film" vibrate independently, but these vibrations cancel each other out, so that the vibration of the thin film is attenuated and the noise is reduced. Previously, as one of the methods of using this thin film as an exterior material, it was considered to use the thin film by bonding it to a frame member. However, with this method, problems such as "inferior in workability" such as the peeling of the weight and the thin film material being damaged during construction, and the attachment of a thin film to improve rust prevention and design are required. As mentioned above, it was necessary to attach a cover panel, and the problem of "complex construction" was pointed out. In addition, the above-described method may not always provide the expected sound insulation effect stably.

However, the above-mentioned problems are caused by the problem that the sound insulating member is made of a rust-proof thin steel plate having a thickness of 0.05 to 0.3 mm, on which a plurality of weights are regularly fixed at regular intervals on one surface. The rigid frame having a body length of 40 mm or more with the fixing surface facing the inside is formed so as to cover and join at least one opening of the rigid frame.

That is, in the present invention, the fixing of the weight to the thin steel plate is stopped only on one side, and the thin steel plate is previously joined to the frame with the weight fixing surface inside, so that the thin steel plate can be fixed during construction or storage. Alternatively, the constructor and the members do not come into direct contact with the weight during transportation, so that problems such as peeling of the weight and breakage of the thin film material are drastically reduced. In addition, since the weight fixing surface of the thin steel plate was joined to the frame with the weight fixing surface inside, if the surface where the weight was not fixed was positioned outside, it would be satisfactory in terms of appearance, Due to the above problem, there is no need to attach a cover panel.

Further, by using a thin steel plate or, if necessary, a weight, a frame, and a rust-proofing treatment such as plating treatment, chemical conversion treatment, painting, etc., the durability can be improved without the need for a cover panel. It is also possible to construct a building that is more excellent in terms of rust prevention and design. By using a thin steel plate as the member for reducing the acoustic vibration and making the thickness of the thin plate 0.05 mm or more, it is possible to secure the required strength for the acoustic vibration reducing member while securing the ability to reduce the acoustic vibration. This makes it possible to prevent the thin steel plate from being bent or damaged when the thin steel plate (acoustic vibration reduction member) is stretched and joined to the frame or when the assembled sound insulating member is handled.

In addition, the thickness of the thin steel plate is suppressed to 0.3 mm or less, and the body length of the rigid frame for joining the thin steel plate is set to 40 mm or more. High sound insulation effect is secured. In other words, if the thickness of the thin steel sheet, which is the sound wave vibration reduction member, is greater than 0.3 mm, the rigidity of the thin steel sheet itself is too large and the vibration area of the thin steel sheet is divided by the “fixed weight” when sound waves are incident. The sound insulation performance is reduced. In addition, "joining a thin steel plate to a rigid frame" means that "the air layer defined by the rigid frame is adjacent to the thin steel plate", but if the thickness of this air layer is small, The air layer acts as a spring, and a low-pitched resonance transmission phenomenon occurs, thereby reducing sound insulation performance. As a result of extensive studies by the present inventors, the thickness of the air layer was 4
0 mm or more, that is, the body length (panel height) of the rigid frame is 4
When it is 0 mm or more, it was found that the air layer did not act as a spring and the sound insulation performance did not decrease. Therefore, by setting the thickness of the thin steel plate and the body length of the rigid frame as described above, a stable and high sound insulation effect can be secured for the first time.

Hereinafter, the effects of the present invention will be described more specifically with reference to examples.

EXAMPLES Example 1 First, four types of "sound insulation members having the form shown in FIG. 1" were prepared by using a steel plate material and having different body lengths (that is, panel heights) of rigid frames.

As the rust-proof thin steel sheet 1 shown in FIG. 1, a hot-dip galvanized steel sheet having a thickness of 0.1 mm was used as a raw material and formed into a square of 600 mm square. Further, as the weight 2, a "disk made of a punched material of a thick steel plate and subjected to galvanization" having a weight of 5.6 g was applied. The rigid frame (panel) 3 is made of Zn-
An Al alloy-plated steel plate was manufactured by forming it into a "frame (panel) with a flange" having a U-shaped cross section shown in FIG. Then, the weight 2 is attached to the rust-proof treated thin steel sheet 1 by 48 m.
m, and the rust-proof thin steel plate 1 to which the weight 2 was fixed was stretched and joined to one open end of a rigid frame (panel) 3 to form a sound insulation member 4. Here, an acrylic adhesive is used to fix the weight 2 to the rust-proof treated thin steel sheet 1, and a double-sided adhesive tape is used to join the rust-proof treated thin steel sheet 1 to the rigid frame (panel) 3. did.

The produced sound insulation member had a rigid frame body length (panel height) of 50 mm (Example 1 of the present invention).
There are four types: 40 mm (Example 2 of the present invention), 30 mm (Comparative Example 1), and 20 mm (Comparative Example 2).

Next, with respect to these sound insulating members, a confirmation test of a noise reduction effect was performed using a test apparatus shown in FIG. Note that the test apparatus shown in FIG. 2 uses a speaker 5 as a sound source, and arranges microphones 6 and 7 before and after a sound insulation member (test body) 4 so that a difference between measured values of the two microphones 6 and 7 is obtained. Thus, the sound insulation effect of the sound insulation member (test body) 4 is calculated.

FIG. 3 shows the test results. This figure 3
Is a mass law of the areal density of the rust-proofing thin steel sheet 1, the weight 2, and the rigid frame (panel) 3 of the sound insulating member according to the invention example 1, the invention example 2, the comparative example 1 and the comparative example 2. From the test results shown in FIG. 3, it can be seen from the test results shown in FIG. 3 that if the rigid frame body length (panel height) is 40 mm or more, the noise reduction performance is significantly reduced in the low frequency band of 80 to 315 Hz. It can be confirmed that it improves.

[Example 2] The rust-proofed thin steel sheet 1 was a 0.29 mm thick "pre-coated steel sheet using a hot-dip galvanized steel sheet as a base material", and the weight 2 was a 38.5 g thick steel sheet. A disk made by stamping a steel plate and having a zinc plating applied thereon. The weight 2 is fixed to the rust-proof thin steel plate 1 at an interval of 76 mm, and the rigid frame has a body length (panel height) of 50 mm. A "sound insulation member of the form shown in FIG. 1" was prepared in the same manner as in Example 1 except that only the type was used.

Then, using the same test apparatus as in Example 1, a confirmation test of the noise reduction effect was performed. FIG.
Is a diagram showing the results of measuring the sound insulation characteristics at this time. From the results shown in FIG. 4, it can be confirmed that sufficiently excellent sound insulation performance can be obtained even when a steel sheet having a thickness of 0.29 mm is used as the rust-proof treated thin steel sheet 1.

[0030]

[Summary of Effects] As described above, according to the present invention, a light weight, high versatility, and excellent sound insulation performance (especially noise reduction performance in a low frequency band), workability, durability, and appearance are excellent. Industrially extremely useful effects are provided, such as providing a sound insulation member that exhibits a sufficient effect as a noise reduction member even when applied to an exterior material of an object.

[Brief description of the drawings]

FIG. 1 is a perspective view (a) and a longitudinal sectional view (b) showing an example of a sound insulating member according to the present invention.

FIG. 2 is a schematic explanatory view of a test device for confirming a noise reduction effect.

FIG. 3 is a diagram showing test results.

FIG. 4 is a diagram showing another test result.

FIG. 5 is an explanatory diagram relating to an example of the previously proposed “sound insulation device made of a thin film”.

FIG. 6 is an explanatory diagram of the noise reduction principle of the previously proposed “sound insulation device made of a thin film”.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rust-proof thin steel plate 2 Weight 3 Rigid frame 4 Sound insulation member 5 Speaker 6 Microphone 7 Microphone 1 'Thin film 2' Weight 3 'Frame member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuhiro Katsura, 4-55, Kobana-ku, Osaka, Osaka Prefecture, Japan 4-72, Konoike Gumi Co., Ltd. (72) Yoshio Nishikawa, 4-55, Kobana, Konohana-ku, Osaka, Osaka No. Konoike Gumi Co., Ltd.

Claims (1)

[Claims] 1. A rust-proof thin steel plate having a thickness of 0.05 to 0.3 mm, on which a plurality of weights are regularly fixed on one side at regular intervals, has a body length of 40 mm with the weight fixing surface inside. A sound insulation member characterized by being joined to at least one opening of the above-mentioned rigid frame so as to cover the opening.