JP2002138591A - Sound insulation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sound insulating structures capable of realizing lighter weight comparing with a conventional one, and being fixed and removed easily. SOLUTION: The sound insulating structures comprise sound insulating layers 45 on their surface, a large number of air bubbles 92 that are made from air 46 charged in the inside of the layers 45, and hollow frames 22 in which the air bubbles 92 are filled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound-insulating structure for insulating noise, and more particularly to a sound-insulating structure suitable for insulating noise generated in the excavation of a road or a railway tunnel.

[0002]

2. Description of the Related Art In the excavation work for roads and railway tunnels, noises such as vibration noise of machines generated during excavation and blasting sounds generated during blasting work are frequently generated. The noise generated at this time is very strong, giving a great deal of discomfort to workers at the site and neighboring residents, and also has a bad effect on health. For this reason, sufficient sound insulation measures are required when performing tunnel engineering works.

[0003] As a countermeasure against blast noise in the civil engineering work of a tunnel, a sound insulating structure formed in the shape of a door with a sound insulating material and a sound absorbing material at the end of the tunnel is installed at the entrance of the tunnel, and the noise generated in the tunnel is isolated. Is common. Also,
In carrying out tunnel construction and the like, when excavated earth and sand is carried out, the excavated earth and sand is sifted through a vibrating sieve that generates loud noise. The noise of the noise generated from the vibration sieve is shielded by covering the entire vibration sieve with a sound insulating structure. In addition, in the construction work of buildings, sound insulation structures are often built to prevent noise in the vicinity.

As a conventional sound insulation structure, a structure in which a door is made of a steel plate as a sound insulation material and a sound absorbing material such as glass wool or rock wool is adhered to the inside of the door is generally used. As described above, by providing the sound insulating material in the sound insulating structure, noise is partially absorbed, and the reverberation of the noise inside the tunnel is reduced. The sound insulation is performed by reducing the energy of noise transmitted through the sound insulation material by using a steel plate as a sound insulation material of the sound insulation structure.

Further, there is a sound insulation structure in which two steel plates are provided, and the sound absorbing material or water is filled between the two steel plates to enhance the sound absorbing effect. There is also a sound insulation structure in which a lead plate having high damping (vibration damping) characteristics is attached to the inside of a door made of the steel material to enhance the sound insulation effect.

[0006]

However, there have been the following problems in the prior art. Since the conventional sound insulation structure uses a sound insulation material (steel plate) having a plate shape, the sound insulation performance depends on a law called the mass law. The mass law is a law that regulates the noise transmittance and the sound insulation effect (transmission loss).

(Equation 1) It is represented by the following equation. Here, TL is transmission loss [unit dB],
m is the areal density (mass per unit area) of the sound insulating structure [unit kg / m ² ], and f is the frequency of noise [unit Hz]. As shown in Expression (1), in order to increase the sound insulation performance (transmission loss), it is necessary to increase the surface density.
It is necessary to increase the thickness of the sound insulating material.

However, if the thickness of the sound insulating material is increased in order to obtain a certain sound insulating effect, the weight of the sound insulating material increases, which increases the load on the mounting and dismounting work. However, there was a problem that the burden increased.

Further, as shown in the equation (1), according to the mass law, the sound insulation performance of the sound insulation material decreases as the frequency becomes lower. Noise in tunnel construction is particularly problematic because sound waves in a low frequency range of several tens of Hz to several hundreds Hz or an ultra-low frequency range below the audible frequency have a problem due to the influence on the human body and vibration of buildings. It has been desired to effectively shield noise in the region and the very low frequency region.

One object of the sound insulation structure according to the present invention is to focus on the problems in the prior art, and to reduce the weight of the sound insulation structure in comparison with the conventional sound insulation structure, and to easily attach and detach the structure. Is what you can do.

Another object of the present invention is to improve the sound insulation performance of the conventional sound insulation structure as compared with the conventional sound insulation structure, and to effectively perform sound insulation particularly in a low frequency region and a very low frequency region. is there.

[0011]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In particular, the sound insulation structure according to the present invention has a gas inside a solid film.
A large number of bubbles that encapsulate the body
The configuration is characterized by being filled. As above
In the sound insulation structure constructed in
In addition, part of the noise is reflected on the film surface forming the foam
Is done. Since the film was formed of a solid,
Part of the noise that enters the bubble is reflected multiple times on the inner surface of the film
And attenuate, and interfere with each other
Is reduced. In addition, one of the noises that are reflected multiple times in the bubble
The part is converted into energy that vibrates the membrane. Bubble body
Are placed close to each other.
The vibrations of the films interfere with each other and cancel each other. Also,
Some of the noise is reflected multiple times in the space formed between the bubbles.
And attenuate each other, and the energy
Reduced. In this way, reflection on the membrane surface,
Multiple reflection between bubbles, cancellation of vibration between films, etc.
Due to the synergistic effect of
Most of that energy is lost, compared to conventional sound insulation structures.
High sound insulation effect in the low frequency range
And effectively reduce noise in the very low frequency range.
it can. In addition, since a foam is used, the sound insulation structure
The weight can be significantly reduced as compared with the related art. Therefore,
Easy installation and removal of sound insulation structures where needed
be able to. As a foam film, a flexible
Plastics are preferred. Form foam with such material
Then, the foam can be compressed and filled in the frame
You. At this time, the foam is at least several kg / m ^Twothat's all
Preferably. Pressing the foam in this way
When shrinking and filling, the foams come into close contact
The gap between them is reduced, including from very low frequency components to high frequency components
High sound insulation effect for broadband noise
You. The shape of the foam is spherical or hemispherical.
Is preferred. Air is bubbled as gas to be sealed in the membrane.
Although preferable from the viewpoint of easiness of body creation and cost, air
It is not limited to. Also, as the structure of the frame, a foam
Hold the holding frame against the frame body to be accommodated, and sandwich
With a structure, many bubbles can be compressed and sealed
Therefore, it is preferable. The frame material is wood, punching metal
Glue, grating, wire mesh, rubber, etc.
It is preferable to use a steel plate for strength and damping characteristics.
No.

Further, the sound insulation structure according to the present invention is characterized in that a sound insulation sheet in which a number of bubbles are formed on a flexible sheet is stacked and housed in a frame.
When configured as described above, in addition to the above-described effects,
The foam can be easily handled and compressed, and can exhibit a high sound insulation effect.

Further, the sound insulation structure according to the present invention has a sheet roll in which a sound insulation sheet in which a large number of air bubbles are formed on a flexible sheet is wound in a column shape, and a frame body which accommodates the sheet roll. The configuration is characterized as follows. With the above-described configuration, in addition to the above-described functions and effects, the formation of the sound insulating structure is easy, and a higher sound insulating effect can be obtained.

In the above structure, a plurality of the sheet rolls may be housed in the frame, and the sheet rolls may be arranged in a multilayer structure in the noise traveling direction by closely contacting each other. With the above configuration, noise does not leak from between the sheet rolls, so that the sound insulation effect can be further enhanced.

In the above configuration, the sheet roll is
It may be characterized by being spirally wound. With the above configuration, the sheet roll can be easily formed, and the sound insulation structure can be easily assembled and disassembled.

In the above structure, the bubble may have a diameter of 0.3 cm or more and 5 cm or less. With the above configuration, a high sound insulation effect can be obtained. If the diameter is smaller than 0.3 cm, the energy of noise substantially propagates through the film of the foam and passes through the sound insulating body, so that it is difficult to obtain a sound insulating effect. On the other hand, if the diameter is larger than 5 cm, a large number of gaps are formed between the bubbles when the sound insulating structure is formed, so that the sound insulating efficiency is reduced.

In the above configuration, the frame may have an opening on the noise incident side, and the noise may be introduced into the bubble through the opening. With the above-described configuration, the noise can be positively introduced into the bubble through the opening provided in the frame, thereby preventing the sound from being sounded. Therefore, the sound insulating effect can be further enhanced.

In the above structure, the frame may have a structure in which a noise transmitting side is shielded. With the above configuration, the magnitude of noise transmitted through the sound insulation structure can be reduced, so that the sound insulation effect can be further enhanced.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound insulating structure according to an embodiment of the present invention will be described in detail with reference to the drawings. In the embodiment, a case will be described in which a sound insulation structure is attached to the entrance of a tunnel to perform sound insulation of a blasting sound during a blasting operation in a tunnel or a noise caused by vibration of equipment during excavation.
The sound insulation structure can be preferably applied in tunnel construction, but is not limited thereto, and may be used, for example, for sound insulation of a building.

FIG. 1 shows a sound insulation structure 2 according to the first embodiment.
FIG. 2 is a perspective view showing the overall configuration of the 0 ’. The sound insulation structure 20 is
A plurality of sheet rolls 40, which will be described in detail later, are accommodated in a frame 22 having a hollow interior. Hereinafter, this will be described in more detail.

The frame 22 has a substantially rectangular parallelepiped holding frame 24 capable of holding the sheet roll 40, and a grid-like pressing frame 30 fixed to the holding frame 22 and applying a compressive force to the sheet roll 40. are doing. The holding frame 24 is open on one side in FIG. 1 (left side in FIG. 1), and a plurality of sheet rolls 40 can be inserted through the opening. In the case of the embodiment, flanges 28 are provided on three sides except the lower side of the opening of the holding frame 24, and an end face of the holding frame 30 is brought into contact with the flange 28, and a bolt 34 and a nut are formed. At 36, it is detachably fastened. With such a structure, as described later, the frame 22
By applying a compressive force to the sheet rolls 40 accommodated therein, the sheet rolls 40 can be brought into close contact with each other. In addition, as a structure of the frame body 22, what can sandwich the sheet roll 40 as a sandwich shape is preferable, but it is not limited to this. The material of the frame 22 is
In the case of the embodiment, iron having a high damping characteristic is used. Further, the holding frame 24 and the holding frame 30 are provided with the hollow 2 respectively.
6, 32 are provided. These hollow holes 26, 32
Is provided, the weight of the frame body 22 is reduced, and noise can be introduced into the sheet roll 40.

In the present embodiment, the sheet rolls 40 in the frame 22 are arranged such that the longitudinal direction (axial direction) is perpendicular to the noise traveling direction. For this reason,
The noise that enters the frame 22 can be prevented from penetrating outside without hitting a later-described bubble 44 of the sheet roll 40, and the noise can be blocked by the sheet roll 40.

The sheet roll 40 will be described with reference to FIG. FIG. 2A is a perspective view of the sound insulating sheet 42 when the sheet roll 40 is formed, and FIG. 2B is a side view of the sound insulating sheet 42. As shown in FIG. 2B, the sheet roll 40 in the present embodiment is formed by winding the sound insulation sheet 42 in a spiral shape to form a cylindrical shape. Sound insulation sheet 42
Has a structure in which a large number of hemispherical bubbles 44 are provided on one surface of a flexible sheet 43 at predetermined intervals. Flexible sheet 4
3 is a commercially available air packing sheet in the case of the embodiment, and includes a base film made of plastic;
A sound insulation film 45 formed of a solid plastic film provided over the base film is integrated. The sound insulating film 45 is provided with a large number of hemispherical portions, and air is sealed between the hemispherical portions and the base film to form the foam 44. The sound insulation sheet 4
Since the material of 2 is a plastic having flexibility,
The sound insulation sheet 42 can be easily compressed and deformed. Therefore, when the sound insulating sheet 42 is spirally wound to form the sheet roll 40, the respective foam bodies 44 can be brought into close contact with each other. The sheet roll 40 formed in this manner is fixed with a string, tape, or the like, and is held in a cylindrical shape.

FIG. 3 shows that the sheet roll 40 is
It is explanatory drawing which shows the process of accommodating in. As shown in FIG. 3A, a plurality of sheet rolls 40 are arranged in the opening of the holding frame 24. At this time, the sheet roll 40
Are compressed and arranged so as to partially protrude from the opening of the holding frame 24. Then, as shown in FIG.
0 is brought into contact with the opening of the holding frame 24, and the sheet roll 40 is pressed into the holding frame 24 and compressed. Then, the flange portion 28 of the holding frame 24 and the end face of the holding frame 30 are fastened with bolts 34 and nuts 36 to form the sound insulation structure 20. In the sound insulation structure 20 thus formed, the foams 44 formed on the sheet roll 40 are in close contact with each other, and the space existing between the foams 44 can be reduced, and the sound insulation effect is enhanced. Further, since the weight of the sound insulation structure can be significantly reduced as compared with the conventional sound insulation structure, the sound insulation structure can be easily attached and detached, and the shape can be easily processed.

FIG. 8 shows a sound insulation structure 2 according to the present embodiment.
It is explanatory drawing which shows an example when 0 is attached to a tunnel entrance. As shown in FIG. 8, the entrance of the tunnel 100 is divided into a plurality of blocks (a to k), and the sound insulation structure 20 is attached to each of the blocks. For the blocks a, b, and e which do not contact the wall surface of the tunnel 100 shown in FIG. 8, a standard rectangular sound insulation structure 20 can be applied. Also,
Even when the sound insulation structure 20 is mounted on blocks c, d, and f to k in contact with the wall of the tunnel 100,
The sound insulation structure 20 can be easily processed into a shape along the curve of the zero wall surface. For this reason, the attachment and detachment work of the sound insulation structure 20 becomes easier as compared with the related art. In addition, the block a is formed in the shape of a door that can be opened and closed so that the vehicle can enter and exit.

The principle of sound insulation of the sound insulation structure 20 configured as described above will be described. FIG. 4 is an explanatory diagram showing the principle of sound insulation of the foam 44. The noise 52 that has entered the frame 22 from the noise source 50 is partially reflected on the surface of the sound insulation film 45 of the bubble 44. Since the sound insulation film 45 is formed of a solid, a part of the noise 52 transmitted through the sound insulation film 45 and incident on the bubble 44 is attenuated by multiple reflections 56 on the inner surface of the sound insulation film 45 and interferes with each other. Energy is reduced. In addition, part of the noise 52 that is multiple-reflected 56 on the inner surface of the sound insulating film 45 is converted into energy that vibrates the sound insulating film 45 itself. Since the foam bodies 44 are arranged such that the sound insulation films 45 are in close contact with each other, the vibrations 58 of the respective sound insulation films 45 are attenuated, interfere with each other, and cancel each other. Further, a part of the noise 52 is attenuated by the multiple reflections 56 even between the sound insulation films 45, and interferes with each other to reduce the energy. That is, the reflection on the surface of the sound insulation film 45 and the bubble 44
Most of the energy of the noise 60 transmitted through the sound insulation structure 20 is lost due to a synergistic effect such as the multiple reflections 56 and 57 in the space between the air bubbles 44 and the cancellation of the vibration 58 between the sound insulation films 45. . As described above, since the energy of the noise 52 is reduced by causing the noises 52 to interfere with each other, a higher sound insulating effect can be exhibited as compared with the conventional sound insulating structure, and the ultra-low frequency region and the ultra-low frequency lower than the audible frequency can be exhibited. The noise 52 in the frequency range can also be effectively reduced. Further, since the vibrations of the sound insulating film 45 interfere with each other and cancel each other, the vibration of the sound insulating film 45 is hardly transmitted to the frame 22. For this reason, there is no possibility that the sound insulation structure 20 itself becomes a new sound source, and the sound insulation effect is not reduced unlike the related art.
In the embodiment, the use of the sound insulation sheet 42 made of plastic provided with air bubbles makes it possible to significantly reduce the weight of the sound insulation structure 20. Construction of an enclosure with a sound insulation structure that covers a noise generating machine such as a press device can be easily performed.

In this embodiment, the sound insulating sheet 42 is spirally wound to form the cylindrical sheet roll 40. However, the method of forming the sheet roll 40 is not limited to this, and for example, a plurality of sound insulating sheets may be formed. 42 may be formed by being wound concentrically. Further, the sheet roll 40 is used for the frame 2.
2 and arranged vertically, but the sheet roll 4
The method of arranging 0 is not limited to this, and may be arranged, for example, horizontally or obliquely. Further, the frame body 22 may have a structure capable of compressing and sandwiching the sheet roll 40, and for example, compressing and sandwiching the sheet roll 40 between a pair of window frame-shaped frames, and using a washer or a nut. The structure may be fixed. When the frame 22 has a structure in which the noise transmitting side is shielded, the sound insulating effect can be further enhanced.

FIGS. 5 to 7 show modified examples of the sound insulation structure according to the present invention. The same members as those described in the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated. In the sound insulation structure 70 according to the second embodiment shown in FIG. 5, the sheet rolls 40 are arranged in the frame 22 so as to have a multilayer structure in the noise traveling direction.
In this embodiment, three layers are arranged in the traveling direction of the noise. By doing so, the sound insulation effect against noise can be enhanced. At this time, if the sheet rolls 40 in the layer are arranged so as to be shifted by a half pitch from the sheet rolls 40 in the adjacent layer, it is possible to prevent noise leakage from between the sheet rolls 40 in the frame 22. That is,
Although the thickness between the sheet rolls 40 in the layer is slightly reduced with respect to noise, the sheet roll 40 in the next layer can be sound-insulated. For this reason, the sheet roll 40
Leakage of noise from between can be prevented, and the sound insulation effect can be further enhanced. On both sides in the frame 22, small-diameter sheet rolls 40a corresponding to the gaps are arranged in a compressed state, and the filling rate of the sheet rolls 40 in the frame 22 is increased to further enhance the sound insulation effect. I have.

FIG. 6 shows a sound insulation structure 80 according to a third embodiment. The sound insulation structure 80 is configured such that a plurality of sound insulation sheets 42 are laminated in a flat plate shape and arranged in the frame 22. Also at this time, it is preferable to arrange the foam bodies 44 between the vertically adjacent sound insulating sheets 42 shown in FIG. 6 so as to be shifted by a half pitch from the viewpoint of achieving a uniform sound insulating effect. Further, the sound insulation structure 80 is arranged by compressing the sound insulation sheet 42 by pressing both sides of a shaft 82 penetrating the frame 22 with a washer 84 and fixing with a nut 86. For this reason, the sound insulation effect can be enhanced. The means for fixing the frame body 22 is not limited to the washer 84 and the nut 86.

FIG. 7 shows a sound insulation structure 90 according to a fourth embodiment. In the sound insulation structure 90, a large number of independent spherical bubbles 92 are closely arranged in the frame 22. The foam 92 has the same structure as the foam 44 except for the shape. Since the foam 92 is formed in a spherical shape, it can be easily compressed and deformed in any direction. For this reason, the inside of the frame body 22 can be more densely compressed and filled, and the sound insulation effect can be enhanced. The shape of the foam 92 is preferably spherical or hemispherical, but is not limited thereto.

The results of measuring the sound insulation performance of the sound insulation structure in the embodiment are shown below. FIG. 9 is an explanatory diagram showing a measurement environment of the sound insulation effect of the sound insulation structure. As shown in FIG. 9, a blast noise generation unit 112 is provided at one end of a wind tunnel 114 made of concrete, and an opening 110 of the generation unit 112 is provided.
Are projected into the wind tunnel 114. An industrial explosive weighing 50 g was loaded in the blast noise generating section 112, and the explosive was ignited and exploded, generating noise 113 in the wind tunnel 114. The wind tunnel 114 is formed in a 1.4 m square, and the length of the wind tunnel 114 is about 6.6 m. And wind tunnel 11
At the exit of No. 4, a sound insulation structure was attached. A point about 10 m from the exit of the wind tunnel 114 was set as a measurement point 118, and a sound level meter was arranged at the measurement point 118 to measure the blast noise. At this time, the embankment 11
6 was provided to prevent leakage of blast noise from around the wind tunnel 118.

FIG. 10 is a comparison diagram of the sound insulation performance of each sound insulation structure provided at the entrance of the wind tunnel 114. The vertical axis in FIG. 10 indicates the sound pressure level (unit: dB), and the horizontal axis indicates the octave band center frequency (unit: Hz). A shown in FIG. 10 is a case where only the frame 22 is arranged, and B is a
C is the case where the sound insulation structure 70 in which the sheet roll 40 having the three-layer structure formed in the same manner as the second embodiment is accommodated in the frame 22 is provided. The frames 22 used for A to C have the same shape and the same size. The frame 22 has an inner dimension in the thickness direction of 140 mm, an inner dimension in the lateral direction of 570 mm, and an inner dimension in the height direction of 970 m.
m. Foam 44 of sheet roll 40 of C
Has a diameter of 10 mm. As shown in FIG. 10, when the sound insulation structure 70 according to the embodiment is used, the sound insulation effect is provided over almost the entire frequency range as compared with the case where the iron plate is used. In particular, 63Hz which is said to have an effect on the human body
In the following low frequency region and very low frequency region, a greater sound insulation effect can be exhibited as compared with an iron plate. Compared to the areal density, the areal density of a 1 mm thick iron plate is 7.8 k
g / m ² , but the surface density of the sound insulation structure 70 in the frame 22 is 4.9 kg / m ^2, which is 40%
Near weight reduction can be achieved.

In FIG. 11, the sound insulation performance was measured when only the frame was arranged and when the sound insulation structure formed similarly to the first to third embodiments of the present invention was arranged. Which structure is more preferable in the sound insulation structure of the embodiment was measured. A shown in FIG. 11 is a case where only the frame body 22 is arranged, and C is formed in the same manner as in the second embodiment.
When the sound insulation structure 70 in which the sheet roll 40 having the layer structure is accommodated in the frame 22 is provided, D denotes the sound insulation in which the sheet roll 40 formed in the same manner as in the first embodiment is accommodated in the frame 22 in a single layer structure. In the case where the structure 20 is provided, E is a case where the sound insulation structure 80 in which the sound insulation sheets 42 formed in the same manner as in the third embodiment are stacked and provided. Each of the frames 22 used for C to E has the same shape and the same size as in the case of FIG. The diameter of the foam 44 used in C and D is 10 mm, and the diameter of the foam 44 used in E is 30 m
m. As can be seen from FIG. 11, the sound insulating structures 20 and 50 on which the sheet rolls 40 are formed have a higher sound insulating effect than the sound insulating structures 80 on which the sound insulating sheets 42 are directly laminated. Further, the sound insulation structure 7 in which the sheet rolls 40 are arranged in a laminated structure rather than the sound insulation structure 20 in which the sheet rolls 40 are arranged in a single layer structure.
0 has a higher sound insulation effect.

[0034]

As described above, in the present invention, synergistic effects such as reflection on the film surface, multiple reflections in bubbles and between bubbles, and cancellation of vibration between films are provided.
Most of the noise is lost when passing through the sound insulation structure, and the noise can exhibit a higher sound insulation effect than the conventional sound insulation structure. Noise can be effectively reduced. Also,
The shape of the frame is easier to process than the conventional steel plate, and the sound insulating structure can be easily formed by filling the frame with a foam. For this reason, it can be easily processed in accordance with a mounting location such as a tunnel entrance. In addition, since the foam is used, the sound insulation structure can be reduced in size and weight as compared with the related art. Therefore, it is possible to easily attach and detach the sound insulating structure to a necessary place.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sound insulation structure according to a first embodiment.

FIG. 2 is an explanatory diagram showing a sheet roll forming method in the embodiment.

FIG. 3 is an explanatory view showing a method of assembling the sound insulation structure of the embodiment.

FIG. 4 is an explanatory diagram showing a sound insulation principle of the embodiment.

FIG. 5 is a plan view of a sound insulation structure according to a second embodiment.

FIG. 6 is an enlarged plan view of a sound insulation structure according to a third embodiment.

FIG. 7 is an enlarged plan view of a sound insulation structure according to a fourth embodiment.

FIG. 8 is a front view showing an example in which the sound insulation structure of the embodiment is arranged at a tunnel entrance.

FIG. 9 is an explanatory diagram showing a measurement environment of a sound insulation effect of the sound insulation structure.

FIG. 10 is a graph showing measurement results of a sound insulation effect.

FIG. 11 is a graph showing measurement results of a sound insulation effect.

[Explanation of symbols]

20 ... sound insulation structure, 22 ... frame, 24 ... holding frame, 26 ... hole for holding frame, 28 ... flange part, 30 ... holding frame, 32 ... holding Holes for frame removal, 34 bolts, 36 nuts, 40
Sheet roll, 42 sound-insulating sheet, 44 foam, 45 sound-insulating film, 46 air, 50 noise source, 52 incident sound, 54 reflected sound , 56 ...
... multiple reflection, 58 ... vibration, 60 ... transmitted sound, 70
…… Sound insulation structure, 80 ……… Sound insulation structure, 90 ………
Sound insulation structure, 92: foam, 100: tunnel entrance, 110: noise source, 112: generator, 1
13 ... noise, 114 ... wind tunnel, 116 ... embankment, 118 ... measurement point

Continuation of front page (71) Applicant 390017927 Rocks Japan Co., Ltd. 1-5-2 Nihonbashi Hamacho, Chuo-ku, Tokyo 3rd floor of Hamacho Ebisu Building (72) Inventor Minoru Takahashi 1-1-1 Uchikanda, Chiyoda-ku, Tokyo Inside Hitachi Plant Construction Co., Ltd. (72) Kentaro Matsumoto, Inventor 1-11-1 Uchikanda, Chiyoda-ku, Tokyo Inside Plant Hitachi Co., Ltd. (72) Kinichiro Asami 1-1, Uchikanda, Chiyoda-ku, Tokyo No. 14 Nippon Plant Construction Co., Ltd. (72) Mamoru Miyaji 1-1-14 Uchikanda, Chiyoda-ku, Tokyo In-house Plant Construction Co., Ltd. (72) Mitsumasa Okamura 1-7 Kyobashi, Chuo-ku, Tokyo No. 1 Inside Toda Kensetsu Co., Ltd. (72) Inventor Masashi Naito 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Kensetsu Co., Ltd. (72) Inventor Toshiaki Hara 1-7-1 Kyobashi, Chuo-ku, Tokyo No. 1 Inside Toda Construction Co., Ltd. (72) Inventor Masaaki Yamamoto Osaka Asahi Kasei Kogyo Co., Ltd., 1-2-6 Dojimahama, Kita-ku, Osaka (72) Inventor Shunichi Sato 1-2-6 Dojimahama, Kita-ku, Osaka-shi, Osaka Asahi Kasei Kogyo Co., Ltd. (72) Inventor Hisaaki Fukui Tokyo 3F, Hamacho Ebisu Building, 1-2-5 Nihonbashi Hamacho, Chuo-ku F-term in Rocks Japan Co., Ltd. F-term (reference) 2D001 AA01 BA01 BB01 CA02 CB02 CD02 2E001 DF02 FA30 GA24 GA47 HB02 HD11 HE07 LA01 5D061 BB02 BB07 BB24 BB28

Claims (8)

[Claims] 1. A sound insulating structure characterized in that a large number of bubbles filled with a gas in a solid film are filled in a frame so as to be in close contact with each other. 2. A sound-insulating structure characterized in that a sound-insulating sheet in which a number of air bubbles are formed on a flexible sheet is stacked and housed in a frame. 3. A sound insulation structure comprising: a sheet roll in which a sound insulation sheet in which a large number of air bubbles are formed on a flexible sheet is wound in a column shape; and a frame accommodating the sheet roll. 4. The frame according to claim 3, wherein a plurality of the sheet rolls are accommodated in the frame body, and the sheet rolls are arranged in a multilayered manner in a traveling direction of the noise by closely contacting each other. Sound insulation structure. 5. The sound insulation structure according to claim 3, wherein the sheet roll is spirally wound. 6. The air bubble according to claim 1, wherein said foam has a diameter of 0.3 cm or more and 5 cm or less.
The sound insulation structure according to any one of the above. 7. The frame according to claim 1, wherein the frame has an opening on the noise incident side, and noise can be introduced into the bubble through the opening. Sound insulation structure. 8. The sound insulation structure according to claim 7, wherein the frame has a structure in which a noise transmitting side is shielded.