Sound insulation structure

Abstract

To provide a sound insulation structure in which an internal pressure set during pressurizing can be kept for a long time even if the sound insulation structure is not connected to a driving device having a pump and the like for controlling the internal pressure.SOLUTION: A sound insulation structure 1 formed in a panel shape includes; a bag body part 2 which is formed by a thin film material and is filled with gas inside; a first rigid material 31 of a planar material, which has a plurality of openings that are brought into close contact with a first face being a side of the bag body part; a second rigid material 32 of a planar material, which has a plurality of openings that are brought into close contact with a second face of the bag body part being a side of an opposite side; a frame body part 4 which maintains the first rigid material, the bag body part and the second rigid material in a laminated state; and elastic materials (61, 62) interposed between the first rigid material and the bag body part and between the second rigid material and the bag body part. The elastic materials are arranged along an inner peripheral edge 43 of the frame body part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sound insulation structure formed in a panel shape. [Background technology]

[0002] It is known that panel-shaped soundproofing structures, such as soundproof panels surrounding noise sources at construction sites, partition walls in houses, soundproofing walls, soundproofing doors, etc., are installed to block noise and other interference (see Patent Documents 1-3, etc.).

[0003] The soundproofing structure disclosed in Patent Document 1 has a structure in which a flexible, bag-shaped membrane material is sandwiched between a rigid material with multiple openings such as wire mesh on both the front and back sides, and the pressure within the membrane material is increased to integrate the rigid material and the membrane material.

[0004] On the other hand, the soundproofing structure disclosed in Patent Document 2 has an iron plate-like body placed on one side of a rubber bag body, and a mesh body acting as a retainer placed on the other side of the bag body, and the bag body is pressurized between the plate-like body and the mesh body, pressing the bag body against the plate-like body to make it adhere closely.

[0005] In short, rectangular panel-shaped soundproofing structures such as those disclosed in Patent Documents 1 and 2 are configured to exert soundproofing performance by injecting a gas such as air to apply pressure (internal pressure) inside the membrane, generating tension in both the rigid material and the membrane material, thereby increasing the rigidity. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-219577 A [Patent Document 2] JP 2017-227109 A [Patent Document 3] Patent No. 5209037 Summary of the Invention [Problem to be solved by the invention]

[0007] In order to ensure a specified level of sound insulation performance, it is essential to maintain the internal pressure of the membrane. However, if the gas inside the membrane repeatedly expands and contracts over a long period of time due to fluctuations in atmospheric pressure and temperature, the internal pressure may decrease and the specified sound insulation performance may no longer be achieved.

[0008] To address this issue, as disclosed in Patent Document 3, a control unit equipped with a pump can be placed to control the internal pressure to a specified level each time. However, when applied to a soundproofing device requiring a large area such as a soundproof wall, multiple units will be required, which will increase the effort and cost required to connect gas supply tubes, etc.

[0009] Therefore, an object of the present invention is to provide a sound-proofing structure that can maintain the internal pressure set when pressurized for a long period of time without being connected to a drive device equipped with a pump or the like for controlling the internal pressure. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the sound-proofing structure of the present invention is a sound-proofing structure formed in a panel shape, comprising: a bag portion formed of a thin film material and having a gas sealed inside; a first rigid portion of a sheet-shaped material having a plurality of openings that is in close contact with a first surface which is a side surface of the bag portion; a second rigid portion of a sheet-shaped material having a plurality of openings that is in close contact with a second surface which is a side surface of the bag portion opposite to the first surface; a frame portion that holds the first rigid portion, the bag portion and the second rigid portion in a stacked state; and an elastic material that is interposed between the first rigid portion and the bag portion and between the second rigid portion and the bag portion, wherein the elastic material is arranged at least along the inner peripheral edge of the frame portion.

[0011] Here, in addition to the elastic material arranged along the inner peripheral edge, the elastic material can also be arranged near the vertical or horizontal center of at least one of the first surface and the second surface.

[0012] The frame body may be configured such that at least one of the first rigid section side and the second rigid section side is partitioned by a partition material that is bridged between opposing frame materials. The elastic material may also be interposed in each of the regions partitioned by the partition material. When the partition materials are disposed on both the first rigid section side and the second rigid section side and are opposed to each other, it is preferable that a spacer is interposed in the frame body to form a gap between the opposing partition materials.

[0013] The elastic material can be made of synthetic rubber, rubber-based sponge, or resin-based sponge. Effect of the Invention

[0014] The sound insulation structure of the present invention thus configured has a structure in which a bag portion filled with gas and a first rigid portion and a second rigid portion on both sides of the bag portion are held in a stacked state by a frame portion. A stretchable elastic material is interposed between the bag portion and the first rigid portion and between the bag portion and the second rigid portion along the inner peripheral edge of the frame portion.

[0015] Therefore, even if the gas inside the membrane repeatedly expands and contracts due to fluctuations in atmospheric pressure and temperature, the elastic material arranged near the inner periphery of the frame expands and contracts to follow the deformation of the bag body, thereby suppressing the drop in internal pressure and maintaining a specified sound insulation performance. In other words, the internal pressure set at the time of pressurization can be maintained for a long period of time without being connected to a drive device equipped with a pump or the like for controlling the internal pressure.

[0016] In addition, by arranging an elastic material near the center of at least one of the vertical or horizontal sides of the bag body, it becomes possible to hold down the contracted bag body even if the side of the bag body becomes wide, thereby improving the function of retaining internal pressure.

[0017] Furthermore, if at least one of the first rigid portion side and the second rigid portion side of the frame body is partitioned by a partition material spanning between opposing frame materials, the natural frequency changes by partitioning the frame body by the partition material, making it possible to obtain sufficient sound insulation in the rigidity law area without changing the area of ​​the panel-like unit.

[0018] Furthermore, if additional elastic material is placed in each area partitioned by the partition material spanning the frame materials, internal pressure can be reliably maintained in all compartments, further enhancing integrity.

[0019] On the other hand, even if the partition materials are arranged in opposing positions on both side surfaces of the bag body portion, by interposing a spacer in the frame body portion so that a gap is formed between the opposing partition materials, it is possible to prevent the partition materials from obstructing the flow of gas within the bag body portion.

[0020] The elastic material arranged to enable the internal pressure of such a bag portion to be maintained for a long period of time can be easily formed from readily available materials such as synthetic rubber, rubber-based sponge, or resin-based sponge. [Brief description of the drawings]

[0021] [Figure 1] 1 is an exploded perspective view illustrating a configuration of a sound insulation structure according to an embodiment of the present invention. [Diagram 2] FIG. 4 is an explanatory diagram showing an enlarged view of the vicinity of a side edge of the assembled sound-proof structure. [Diagram 3] FIG. 4 is a cross-sectional view illustrating the configuration of the vicinity of the upper edge of the assembled sound-proof structure. [Figure 4] These are diagrams for explaining the phenomenon that occurs when the bag body portion repeatedly expands and contracts, where (a) is an explanatory diagram showing a state in which no elastic material is placed, and (b) is an explanatory diagram showing a state in which an elastic material is placed. [Diagram 5] FIG. 1 is a perspective view illustrating the configuration of a sound-proofing structure according to an embodiment of the present invention, which was used in an experiment conducted to confirm the effect of an elastic material on internal pressure, showing only the first surface side of the bag body. [Figure 6] FIG. 13 is a perspective view illustrating the configuration of a test specimen used as a comparative example in the experiment, showing only the first surface side of the bag portion. [Figure 7] FIG. 11 is a cross-sectional view illustrating the configuration of a test specimen of a comparative example of the experiment. [Figure 8] FIG. 13 is an explanatory diagram showing experimental results. [Figure 9] FIG. 13 is an explanatory diagram showing experimental results. [Figure 10] FIG. 2 is an exploded perspective view illustrating the configuration of the sound insulation structure of the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view for explaining the configuration of a sound insulation structure 1 of the present embodiment. Fig. 2 is an explanatory view showing an enlarged view of the vicinity of a side edge of the assembled sound insulation structure 1.

[0023] The sound insulation structure 1 of this embodiment is formed in a panel shape, such as a substantially rectangular shape when viewed from the front. For example, a noise source such as a construction site can be enclosed by arranging a plurality of panel-shaped sound insulation structure 1 units. Also, a partition wall separating two spaces can be formed by a plurality of panel-shaped sound insulation structures 1.

[0024] This sound-proofing structure 1 is mainly composed of a bag body portion 2 formed from a thin film material and having gas sealed inside, a first rigid material 31 as a first rigid portion adhered to a first surface of the bag body portion 2, a second rigid material 32 as a second rigid portion adhered to a second surface opposite the first surface, a frame body portion 4 that holds the first rigid material 31, the bag body portion 2 and the second rigid material 32 in a stacked state, and elastic materials (61, 62) that are interposed between the first rigid material 31 and the bag body portion 2 and between the second rigid material 32 and the bag body portion 2.

[0025] The bag portion 2 is made of a flexible thin film material. For example, a polyethylene sheet, a polyvinyl chloride sheet, a rubber sheet, or the like can be molded into a bag shape. The thickness of the thin film material is preferably about 0.01 mm to 1 mm.

[0026] The initial shape of the bag body 2 is not limited because the shape is deformed by the constraint of the rigid materials arranged on both sides, namely the first rigid material 31 and the second rigid material 32. For example, a rectangular polyethylene sheet can be folded in half and the edges 21 welded together to form a bag shape.

[0027] Although not shown, the bag body 2 is provided with an inlet with a check valve for injecting gas into the bag body 2, and an outlet can be provided as necessary. The gas to be injected into the bag body 2 when pressurized is not particularly limited and may be air, helium gas, carbon dioxide, nitrogen gas, or the like.

[0028] Furthermore, an elastic frame material (not shown) having a generally rectangular shape when viewed from the front can be attached to the edge 21 of the bag body 2 as needed. The elastic frame material is an anti-slip material arranged to prevent the inflated bag body 2 from slipping off the frame 4, which may occur depending on the specifications of the rigid materials (31, 32), and can be made of a material that can ensure friction resistance, such as chloroprene rubber or EPDM rubber (ethylene propylene diene rubber). Furthermore, by providing the elastic frame material, the edge 21 of the bag body 2 can be prevented from being damaged.

[0029] This elastic frame material is different from the stretchable elastic material (61, 62) arranged to maintain internal pressure, and is contained between the opposing frame portions (41, 42) of the frame body portion 4, and does not protrude from the frame portions (41, 42). In contrast, in the sound-proofing structure 1 of the present embodiment, as shown in Fig. 2, the first elastic material 61 (second elastic material 62) is arranged to protrude toward the center beyond the inner peripheral edge 43 of the first frame portion 41 (second frame portion 42) constituting the frame body portion 4, but details will be described later.

[0030] The first rigid material 31 is in close contact with the first surface, which is the side surface of the bag body 2, except for the area where the first elastic material 61 is interposed. The first rigid material 31 is a planar material having a plurality of openings. In other words, the openings correspond to the meshes of the lattice. The first rigid material 31 can be made of a material that can ensure rigidity as a planar material, such as a punched panel, fine mesh, wire mesh, wire netting, or honeycomb material. Examples of materials that can be used include metal, plastic, paper, wood, and glass.

[0031] The aperture ratio of the first rigid material 31, for example in a lattice shape, can be adjusted by the line diameter (width) of the horizontal and vertical lines and the pitch (arrangement interval) of the horizontal and vertical lines. On the other hand, the surface density of the first rigid material 31 is the mass per unit area, and therefore can be adjusted by the material (density) of the horizontal and vertical lines in addition to the line diameter (width) and pitch (arrangement interval) of the horizontal and vertical lines.

[0032] A second rigid material 32 is attached to the second surface, which is the side surface opposite to the first surface of the bag body portion 2, except for the area where the second elastic material 62 is interposed. This second rigid material 32 has the same configuration as the first rigid material 31 described above, so a duplicated description will be omitted. The first rigid material 31 and the second rigid material 32 may have the same opening rate and surface density or may have different configurations. In other words, by changing the material and wire diameter (width) of the horizontal and vertical lines, or by changing the pitch (arrangement interval) of the horizontal and vertical lines, combinations with different opening rates and surface densities can be made.

[0033] The frame body 4 includes a generally rectangular frame member in a front view that is disposed at least along the edge 21 of the bag body 2. The frame body 4 is mainly composed of a first frame portion 41 that is disposed on the first rigid material 31 side, and a second frame portion 42 that is disposed on the second rigid material 32 side.

[0034] The first frame portion 41 is formed into a roughly rectangular shape when viewed from the front, and is made up of horizontal members 411, 411 that form the long-side frame members arranged roughly parallel to the top and bottom, and vertical members 412, 412 that form the short-side frame members arranged roughly parallel to the left and right so as to connect both ends of the horizontal members 411, 411.

[0035] In addition, the second frame portion 42 is formed into a roughly rectangular shape when viewed from the front, and is made up of horizontal members 421, 421 which serve as frame members on the long sides and are arranged roughly parallel to the top and bottom, and vertical members 422, 422 which serve as frame members on the short sides and are arranged roughly parallel to the left and right so as to connect both ends of the horizontal members 421, 421.

[0036] The first frame portion 41 and the second frame portion 42 are formed to have a degree of rigidity that prevents significant deformation or damage when the inside of the bag body portion 2 is expanded under high pressure. For example, the first frame portion 41 and the second frame portion 42 can be manufactured into a rectangular frame shape using members that are generally L-shaped or rectangular in cross section, such as steel, aluminum, wood, or plastic.

[0037] In addition, in the sound-proofing structure 1 of this embodiment, crosspiece members 5 are attached to each of the first frame portion 41 and the second frame portion 42 constituting the frame body portion 4 as partition members that divide the rectangular space into rectangles.

[0038] In detail, in the first frame portion 41, the cross members 5 serving as vertical cross members are bridged between the horizontal members 411, 411 serving as long sides. The cross members 5 are arranged approximately parallel to and at equal intervals between the vertical members 412, 412 of the first frame portion 41, and the rectangular space of the first frame portion 41 is divided into a plurality of rectangles of the same size.

[0039] Similarly, in the second frame portion 42, cross members 5 serving as vertical cross members are bridged between the horizontal members 421, 421 serving as long sides. The cross members 5 are arranged approximately parallel to and at equal intervals between the vertical members 422, 422 of the second frame portion 42, and the rectangular space of the second frame portion 42 is divided into a plurality of rectangles of the same size.

[0040] The crosspiece 5 may be made of a material and have a shape that will not buckle due to the compressive force acting thereon as described below. For example, the crosspiece 5 may be formed into a rectangular parallelepiped shape from steel, aluminum, wood, plastic, etc. The crosspiece 5 may be joined to the cross members 411, 421 by welding or the like, or may be fixed by bolts or the like.

[0041] In the sound-proofing structure 1 of this embodiment, as shown in Figures 1 and 2, a first elastic material 61 is interposed between the first rigid material 31 and the bag body portion 2, and a second elastic material 62 is interposed between the second rigid material 32 and the bag body portion 2, at least along the inner peripheral edge 43 of the frame body portion 4.

[0042] The first elastic member 61 is disposed in a generally rectangular frame shape in front view at least along the inner peripheral edge 43 of the frame body portion 4. Here, the long sides disposed generally parallel to the top and bottom are horizontal members 611, 611, and the short sides disposed generally parallel to the left and right so as to connect both ends of the horizontal members 611, 611 are vertical members 612, 612.

[0043] Furthermore, as the first elastic member 61, in addition to the elastic members (611, 612) arranged in a frame shape along the inner peripheral edge 43, a central member 613 serving as an elastic member is also arranged near the center in the vertical direction of the first surface of the bag portion 2. That is, the central member 613 is bridged between the vertical members 612, 612 approximately parallel to the horizontal member 611.

[0044] The second elastic member 62 disposed on the second surface, which is the side surface opposite to the first surface of the bag body portion 2, has the same configuration as the above-mentioned first elastic member 61, and therefore a duplicated description will be omitted. The second elastic member 62 is disposed in a substantially rectangular frame shape in front view at least along the inner peripheral edge 43 of the frame body portion 4, and includes horizontal members 621, 621 disposed substantially parallel to one another from top to bottom, vertical members 622, 622 disposed substantially parallel to the left and right so as to connect both ends of the horizontal members 621, 621, and a central member 623 bridged between the vertical members 622, 622 substantially parallel to the horizontal member 621.

[0045] The first elastic material 61 and the second elastic material 62, which are stretchable, are made of synthetic rubber such as chloroprene rubber, EPDM rubber (ethylene propylene diene rubber), rubber-based sponge such as natural rubber, or resin-based sponge such as urethane, etc. In other words, an elastic material that is resistant to repeated contraction and restoration can be used.

[0046] The thickness of the first elastic material 61 and the second elastic material 62 is about 2 mm to 4 mm, for example about 3 mm, and if it is too thick, the difference with the portion where the first elastic material 61 (second elastic material 62) is not interposed becomes too large, which is not preferable. In addition, the width (length of vertical protrusion from the inner peripheral edge 43) of the band-shaped horizontal members 611, 621 and the width (length of horizontal protrusion from the inner peripheral edge 43) of the vertical members 612, 622 are preferably 25 mm or more.

[0047] In short, as shown in FIG. 3, it is preferable to provide horizontal members 611, 621 and vertical members 612, 622 protruding downward (or upward) from the inner peripheral edge 43 of the frame body portion 4 to a height of 25 mm or more on the first frame portion 41 side and the second frame portion 42 side.

[0048] Here, the function of the elastic members (61, 62) will be described with reference to Fig. 4. When the gas filled inside the bag body 2 repeatedly expands and contracts with fluctuations in atmospheric pressure and temperature, the first rigid member 31 and the second rigid member 32 cannot follow the deformation of the bag body 2, and plastic deformation occurs around the frame body 4, as shown in Fig. 4(a).

[0049] When the bag body portion 2 contracts while the first rigid material 31 and the second rigid material 32 are plastically deformed to the shape of the bag body portion 2 when expanded, a gap will be created between the first rigid material 31 and the second rigid material 32 around the edge portion 21 of the bag body portion 2.

[0050] Such a gap may also occur when the edge 311 of the first rigid member 31 or the edge 321 of the second rigid member 32 slips out from between the first frame portion 41 and the second frame portion 42. This slipping out may occur when the edges 311, 321 slip through. It may also occur when the bolt holes provided in the edges 311, 321 are plastically deformed when the first frame portion 41 and the second frame portion 42 are connected with bolts. For this reason, if the edges 311, 321 are made flat without openings, for example, to reinforce the periphery of the bolt holes, the occurrence of gaps due to the widening of the bolt holes can be suppressed.

[0051] If the bag body portion 2 expands again while such gaps or the like have occurred, excessive stress will be applied to areas (particularly near the frame body portion 4) where the bag body portion 2 and the first rigid material 31 (second rigid material 32) are not integrated, which may cause the first rigid material 31 (second rigid material 32) to bend and become damaged.

[0052] Furthermore, if there is a gap between the bag body portion 2 and the first rigid material 31 (second rigid material 32), the first rigid material 31, the second rigid material 32, and the membrane material of the bag body portion 2 will not be in the state where the set tension is generated when pressure is applied, and the desired sound insulation performance obtained by increasing the rigidity will not be obtained.

[0053] In response to this, as shown in Figure 4(b), by interposing a first elastic material 61 (second elastic material 62) between the bag body portion 2 and the first rigid material 31 (second rigid material 32) at a position adjacent to the inner peripheral edge 43 of the frame body portion 4 where the above-mentioned gap is likely to occur, it is possible to fill the gap.

[0054] The first elastic material 61 (second elastic material 62) is formed from a material that is resistant to repeated elastic deformation, so that when the bag body portion 2 expands, it contracts to fit between the bag body portion 2 and the first rigid material 31 (second rigid material 32), and when the bag body portion 2 contracts, it restores to its original shape to fill the gap between the bag body portion 2 and the first rigid material 31 (second rigid material 32).

[0055] Furthermore, when the bag body portion 2 and the first rigid material 31 (second rigid material 32) are integrated via the first elastic material 61 (second elastic material 62), a high rigidity state is achieved in which the tension set in the first rigid material 31, the second rigid material 32, and the membrane material of the bag body portion 2 is maintained, making it possible to sustain the desired sound insulation performance.

[0056] In particular, by using a material such as a punched panel that is more rigid and less susceptible to plastic deformation than fine mesh for the first rigid material 31 and the second rigid material 32, gaps are less likely to occur, and the effect of arranging the elastic material (61, 62) along the inner peripheral edge 43 of the frame body portion 4 can be further enhanced.

[0057] The first frame portion 41, the first rigid material 31, the bag body portion 2, the second rigid material 32, and the second frame portion 42 shown in the exploded oblique view of Figure 1 are stacked, and the first frame portion 41 and the second frame portion 42 are connected together by bolts or metal clamps to form an integrated unit.

[0058] 3, a pair of flat spacers 7, 7 are disposed between the first frame portion 41 and the second frame portion 42 so as to sandwich the edge portions 311, 321 of the first rigid member 31 and the second rigid member 32 and the edge portion 21 of the bag portion 2. The spacer 7 is formed from a stainless steel plate, a steel plate, an aluminum plate, a wooden plate, a plastic plate, or the like.

[0059] By providing the spacers 7, 7, a gap can be provided between the opposing cross members 5, 5 attached to the cross members 411, 421 of the frame body 4. In this way, even when the frame body 4 is connected, the inside of the bag body 2 can communicate between the cross members 5, 5, and the movement of the gas injected into the bag body 2 during pressurization can be prevented from being hindered by the cross members 5.

[0060] The first rigid material 31 (second rigid material 32) is in close contact with the side surface of the inflated bag portion 2. Because the inside of the bag portion 2 is under high pressure, the thin film material of the bag portion 2 bulges out from the opening surrounded by the horizontal and vertical lines.

[0061] In other words, the thin film material of the bag portion 2 is in a state in which tension is applied. The thin film material to which tension is applied has increased rigidity against incident sound waves, and is therefore less likely to vibrate according to the rigidity law. Furthermore, the rigidity against incident sound waves can also be increased by integrating the first rigid material 31 (second rigid material 32) and the thin film material of the bag portion 2 through close contact.

[0062] Such a state in which tension is applied to the thin film material of the bag body portion 2 and the first rigid material 31 (second rigid material 32) and the thin film material of the bag body portion 2 are integrated through close contact, resulting in increased rigidity, can be maintained for a long period of time by interposing an elastic first elastic material 61 (second elastic material 62) between the first rigid material 31 (second rigid material 32) and the bag body portion 2 as described above.

[0063] Incidentally, when the surface density of the rigid materials (31, 32) and the thin film material of the bag portion 2 and the internal pressure of the bag portion 2 are constant, the natural frequency changes according to the constrained dimensions of the rigid materials (31, 32) and the bag portion 2, and shifts to a higher frequency as the area becomes smaller. Therefore, by attaching the crosspiece 5, it becomes possible to have a natural frequency in each of the ranges surrounded by the crosspiece 5 and the frame portions (41, 42) around the thin film material and the rigid materials (31, 32) of the bag portion 2.

[0064] In other words, the primary natural frequency that results in sound insulation deficit is determined depending on the external dimensions based on the length and width of the sound-proofing panel, but if the crosspieces are removed and the area is increased, the natural frequency shifts to the lower frequency side, and the frequency range in which sound insulation can be obtained in the low-frequency sound region (rigidity law region) becomes narrower.

[0065] In contrast, by arranging crosspieces 5 in the frame portion 4, the area that affects the sound insulation performance of the sound insulation panel (hereinafter referred to as the "apparent area" for convenience) can be reduced, and the primary natural frequency that causes sound insulation defects can be shifted to the higher frequency side. When arranging crosspieces 5, the apparent area can be further reduced by making the pitch finer, so that the natural frequency can be shifted to the higher frequency side.

[0066] Furthermore, by shifting the primary natural frequency, which is the cause of the sound insulation defect, to the higher frequency side, the frequency range in which sound insulation can be obtained in the low-frequency sound range is expanded accordingly, thereby improving the sound insulation performance in the low-frequency sound range.

[0067] In short, by reducing the area of ​​one unit of the soundproof panel, the primary natural frequency that causes sound insulation defects can be shifted to the higher frequency side, but when insulating a large area with small units, many units are required, which takes time and effort to pressurize the bag body 2 of each unit and to install many units. In contrast, when the rectangular space of the frame body 4 is partitioned using the crosspiece 5, it is only necessary to pressurize one bag body 2, so the installation process, including the pressurization work, can be easily carried out.

[0068] Furthermore, by bridging the cross members 411, 411 (421, 421), the cross members 5 can be used as tension resistance members for suppressing inward deformation of the cross members 411, 411 (421, 421). In the sound-insulating structure 1 in which the frame body 4 is less susceptible to deformation due to the placement of the cross members 5, gaps are hardly generated by the pressure applied by the bag body 2 even when units are arranged above and below each other, and sound insulation defects due to gaps can be suppressed.

[0069] Next, the results of an experiment conducted to confirm the internal pressure retaining performance of the sound insulation structure 1 of this embodiment will be described. In the experiment, in order to confirm the effect of the elastic material arranged along the inner peripheral edge 43 of the frame body portion 4, a sound-insulating structure 1A was used that had elastic materials (61, 62) without a central material 613, as shown in Figure 5.

[0070] 5 is an exploded perspective view illustrating the configuration of a sound insulation structure 1A, which is a test specimen used in the experiment, showing only the first surface side of the bag portion 2. The only difference from the sound insulation structure 1 described above is that the first elastic material 61 and the second elastic material 62 do not have central materials 613, 623 disposed therein.

[0071] The details of the sample of the sound insulation structure 1A used in the experiment are described below. The bag part 2 has a thickness of 0.11 mm and an areal density of 0.253 kg / m 2 It is made of a composite material of polyethylene and nylon to give it flexibility.

[0072] A punched panel with a thickness of 1 mm was used for the first rigid member 31 and the second rigid member 32. This punched panel has many openings other than the edge portions 311, 321, and the edge portions 311, 321 are formed in a flat plate shape without any openings. In other words, the periphery of the bolt hole for the bolt connecting the first frame portion 41 and the second frame portion 42 is reinforced.

[0073] The spacer 7, which is generally rectangular when viewed from the front, was made of a stainless steel plate with a thickness of 3.2 mm. The first elastic member 61 and the second elastic member 62 were made of a strip-shaped EPDM rubber sponge with a thickness of 3 mm and a width of 25 mm. Angle bars were used for the horizontal members 411, 421 and the vertical members 412, 422 of the frame body 4, and square pipes were used for the crosspiece members 5.

[0074] On the other hand, Fig. 6 and Fig. 7 show the configuration of a test specimen as a comparative example of the experiment. Fig. 6 is an exploded perspective view similar to Fig. 5, illustrating the configuration of a test specimen produced as a comparative example, showing only the first surface side of the bag portion 2.

[0075] The biggest difference between the test specimen of the comparative example and the sound insulation structure 1A of the present invention is that the test specimen of the comparative example does not have elastic materials (61, 62). As the test specimen of the comparative example, a test specimen using a fine mesh with a thickness of 0.7 mm for the first rigid member 31 and the second rigid member 32 (hereinafter referred to as "comparative example") and a test specimen using a punched panel with a thickness of 1 mm (hereinafter referred to as "without elastic material") were produced. Here, the fine mesh has openings (lattice mesh) provided up to the edge 311.

[0076] In the experiment, the sound insulation structure 1A of the present invention (hereinafter referred to as "with elastic material") and a test specimen of a comparative example ("Comparative Example" and "without elastic material") were placed in a thermostatic chamber with constant temperature and humidity to verify the internal pressure retention performance. In the experiment, the initial internal pressure was set to 5 kPa for the sound insulation structure 1A "with elastic material" and the test specimen "without elastic material," and 4 kPa for the test specimen of the "Comparative Example."

[0077] The experimental results are shown in Figure 8. Figure 8 shows the change in internal pressure over a 17-day period from the start of measurements. The sound insulation structure 1A with "elastic material" experienced almost no drop in internal pressure during this period. Furthermore, even when looking at the results of the internal pressure fluctuations over a long period (approximately 4 to 6 months) shown in Figure 9, no significant drop in internal pressure was observed, confirming high internal pressure retention performance.

[0078] On the other hand, the test specimen of the "Comparative Example" in which fine mesh was used for the first rigid material 31 and the second rigid material 32 showed a tendency for the internal pressure to gradually decrease even during this short period of 17 days. Furthermore, the test specimen of the "without elastic material" in which punching panels were used for the first rigid material 31 and the second rigid material 32 showed that the internal pressure, which was initially set at 5 kPa, decreased to 1 kPa in just about one week.

[0079] Next, the operation of the sound insulation structure 1, 1A of the present embodiment will be described. The sound insulation structure 1, 1A of the present embodiment thus configured is configured such that the bag body 2 filled with gas and the first rigid material 31 and the second rigid material 32 on both sides thereof are held in a layered state by the frame body 4. A first elastic material 61 and a second elastic material 62 are interposed between the bag body 2 and the first rigid material 31 and the second rigid material 32 along the inner peripheral edge 43 of the frame body 4, respectively.

[0080] Therefore, even if the gas inside the bag body portion 2 repeatedly expands and contracts due to fluctuations in atmospheric pressure and temperature, the elastic material (61, 62) arranged near the inner peripheral edge 43 of the frame body portion 4 expands and contracts to follow the deformation of the bag body portion 2, thereby maintaining the integration of the first rigid material 31 (second rigid material 32) and the bag body portion 2 and maintaining the internal pressure.

[0081] As a result, the drop in internal pressure is suppressed, and the desired sound insulation performance can be maintained. In other words, the internal pressure set at the time of pressurization can be maintained for a long period of time without connecting to a drive device equipped with a pump or the like for controlling the internal pressure.

[0082] In addition, the sound-proofing structure 1 in which the elastic central material 613, 623 is arranged near the vertical center of both side surfaces of the bag body portion 2 is able to hold down the contracted bag body portion 2 near the center even if the side surfaces of the bag body portion 2 become wider, thereby improving the function of retaining internal pressure.

[0083] Furthermore, since both the first frame portion 41 and the second frame portion 42 of the frame body portion 4 are partitioned by the crosspiece material 5 that is spanned between the opposing cross members 411, 411 (421, 421), the natural frequency changes by partitioning the frame body portion 4 by the crosspiece material 5, making it possible to obtain sufficient sound insulation in the rigidity law region without changing the area of ​​the panel-like unit.

[0084] Furthermore, even when a pair of crosspieces 5, 5 are arranged at opposing positions on both side surfaces of the bag body portion 2, by interposing a spacer 7 in the frame body portion 4 so as to form a gap between the opposing crosspieces 5, 5, it is possible to prevent the crosspieces 5, 5 from obstructing the flow of gas inside the bag body portion 2.

[0085] The stretchable elastic material (61, 62) arranged to enable the internal pressure of such a bag portion 2 to be maintained for a long period of time can be easily formed from readily available materials such as synthetic rubber, rubber-based sponge, or resin-based sponge.

[0086] The sound insulation structure 1, 1A, which is composed of the bag body 2 in which gas is sealed, the first rigid member 31, the second rigid member 32, and the frame body 4, can be manufactured to be lightweight even when the elastic members (61, 62) are attached. The lightweight sound insulation structure 1, 1A can be easily installed in various places such as construction sites and inside houses. EXAMPLES

[0087] A sound insulation structure 1B of Example 1, which is different from the sound insulation structures 1 and 1A described in the above embodiment, will be described below with reference to Fig. 10. Note that the same terms or the same reference numerals will be used to describe the same or equivalent parts as those described in the above embodiment.

[0088] 10, in the sound-insulating structure 1B described in this Example 1, an elastic material is interposed in each of the regions partitioned by the crosspiece members 5 attached as partition members to the frame body portion 4. The configurations of the first elastic material 61B and the second elastic material 62B of the sound-insulating structure 1B will be described below.

[0089] The first elastic member 61B is mainly composed of horizontal members 611, 611 and vertical members 612, 612 arranged in a generally rectangular frame shape when viewed from the front along the inner peripheral edge 43 of the frame portion 4, and a partition member 614 spanning between the horizontal members 611, 611.

[0090] The partition members 614, which are made of the same stretchable elastic material as the horizontal members 611, etc., are disposed approximately parallel to and at equal intervals between the vertical members 612, 612. In other words, the partition members 614 are disposed near the center in the horizontal direction between the crosspiece members 5, 5 attached to the first frame portion 41.

[0091] The second elastic member 62B disposed on the second surface, which is the side surface opposite to the first surface of the bag body portion 2, has a configuration similar to that of the first elastic member 61B described above, and therefore will not be described again.

[0092] In this way, if additional partition materials 614, which are elastic materials, are placed in each area partitioned by the cross members 5 spanning between the cross members 411, 411 (421, 421) of the frame body portion 4, the internal pressure can be reliably maintained in all compartments, further enhancing the integrity.

[0093] Other configurations and effects of the first embodiment are substantially the same as those of the above-described embodiment, and therefore description thereof will be omitted.

[0094] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments and examples, and design changes that do not deviate from the gist of the present invention are included in the present invention.

[0095] For example, in the above embodiment, an example was described in which elastic materials (61, 62) were arranged along the inner peripheral edge 43 of the frame body 4 in a substantially rectangular shape when viewed from the front or in a "日" character shape when viewed from the front. In Example 1, an example was described in which elastic materials (61B, 62B) having a shape in which a substantially rectangular shape when viewed from the front was partitioned by vertical bars were arranged, but the present invention is not limited thereto. For example, elastic materials may be arranged in an X shape or a V shape inside the substantially rectangular shape when viewed from the front. Further, elastic materials may be arranged so as to cover the entire side surface of the bag body 2.

[0096] In addition, in the above embodiment and Example 1, the case where the cross member 5 is provided on the frame body 4 was described, but the present invention is not limited thereto, and a configuration may be employed in which only the substantially rectangular shape when viewed from the front of the first frame portion 41 and the second frame portion 42 is provided. Further, as the partitioning member, a partitioning member having a lattice shape or a truss shape may be provided.

Explanation of Reference Numerals

[0097] 1, 1A: Sound insulation structure 2: Bag body 31: First rigid material (first rigid portion) 32: Second rigid material (second rigid portion) 4: Frame body 41: First frame portion 411: Horizontal member (frame member) 412: Vertical member (frame member) 42: Second frame portion 421: Horizontal member (frame member) 422: Vertical member (frame member) 43: Inner peripheral edge 5: Cross member (partitioning member) 61: First elastic material (elastic material) 611: Horizontal member 612: Vertical member 613: Central member 62: Second elastic material (elastic material) 621: Horizontal member 622: Vertical member 623: Central member 7: Spacer 1B: Sound insulation structure 61B: First elastic material (elastic material) 62B: Second elastic material (elastic material) 614: Partition material

Claims

1. A sound insulation structure formed in a panel shape, a bag portion formed of a thin film material and having a gas sealed therein; A first rigid portion of a sheet-shaped material having a plurality of openings and in close contact with a first surface that is a side surface of the bag portion; a second rigid portion of a sheet-shaped material having a plurality of openings and in close contact with a second surface of the bag portion, the second rigid portion being a side surface opposite to the first surface; a frame portion that holds the first rigid portion, the bag portion, and the second rigid portion in a stacked state; an elastic material interposed between the first rigid portion and the bag portion and between the second rigid portion and the bag portion, A sound-proofing structure, characterized in that the elastic material is arranged along an inner peripheral edge of the frame body portion so as to extend beyond the inner peripheral edge toward the center of the bag body portion.

2. 2. The sound-proofing structure according to claim 1, characterized in that, in addition to the elastic material arranged along the inner peripheral edge, a central elastic material is also arranged near the center in the vertical or horizontal direction of at least one of the first surface and the second surface.

3. 3. The sound-proofing structure according to claim 1, wherein at least one of the first rigid portion side and the second rigid portion side of the frame body is partitioned by a partition material that is bridged between opposing frame materials.

4. 4. The sound insulation structure according to claim 3, wherein an elastic material serving as a partitioning material is interposed in each of the regions partitioned by the partitioning material.

5. The sound-proofing structure according to claim 3 or 4, characterized in that when the partitioning materials are arranged on both the first rigid portion side and the second rigid portion side and opposed to each other, a spacer is interposed in the frame portion to form a gap between the opposing partitioning materials.

6. 6. The sound insulation structure according to claim 1, wherein the elastic material is made of synthetic rubber, a rubber-based sponge, or a resin-based sponge.

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