Wall structure

Abstract

To provide a wall structure capable of properly insulating sound.SOLUTION: A wall structure provided in a building 1 includes a first wall plate 2, a second wall plate 3 disposed in parallel with the first wall plate 2 at a predetermined interval, a plurality of support members 4 disposed in parallel with each other at a predetermined interval between the first wall plate 2 and the second wall plate 3 and supporting at least the first wall plate 2, and a plurality of first wall plate mass dampers 8 including a first wall plate elastic member 11 supported by the first wall plate 2 between two adjacent support members 4 and a first wall plate weight 12 attached to the first wall plate elastic member 11. The plurality of first wall plate mass dampers 8 include two or more types of first wall plate mass dampers 8 having different natural frequencies.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sound-insulating wall structure provided in a building. [Background technology]

[0002] There are various techniques for improving the sound insulation of double walls in buildings. For example, Patent Document 1 describes a sound insulation wall structure in which bags filled with multiple vibration-damping granular materials made of synthetic resin or synthetic rubber are placed between the first and second walls, and the bags are compressed by the first and second walls. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-84598 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in Patent Document 1, the frequency dependency of the sound insulation properties of the sound insulation wall structure (frequency dependency of the transmission loss of the sound insulation wall structure) changes depending on the pressure with which the first and second walls compress the bag and the properties of the vibration-damping granular material. Patent Document 1 does not describe a technology for adjusting the frequency dependency of the sound insulation properties of the sound insulation wall structure. Therefore, even if the sound insulation wall structure of Patent Document 1 is used, sufficient sound insulation may not be obtained depending on the frequency dependency of the sound insulation properties of the sound insulation wall structure.

[0005] In view of the above background, an object of the present invention is to provide a wall structure that can adequately insulate sound. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a wall structure (1, 21, 31) installed in a building, comprising: a first wall panel (2); a second wall panel (3, 22) arranged parallel to the first wall panel at a predetermined interval; a plurality of support members (4) arranged parallel to each other at a predetermined interval between the first wall panel and the second wall panel and supporting at least the first wall panel; and a plurality of first wall panel mass dampers (8, 8A to 8I) including a first wall panel elastic member (11) supported on the first wall panel between two adjacent support members and a first wall panel weight (12) attached to the first wall panel elastic member, wherein the plurality of first wall panel mass dampers include two or more types of first wall panel mass dampers having different natural frequencies.

[0007] According to this aspect, the wall structure has two or more types of first wall panel mass dampers with different natural frequencies, and therefore can adequately insulate sounds over a wider range of frequencies than a double wall provided with only a mass damper with a single natural frequency.

[0008] In the above aspect, the wall structure (1) further includes a plurality of second wall panel mass dampers (16A to 16C) including a second wall panel elastic member (18) fixed to the second wall panel between two adjacent support members and a second wall panel weight (19) attached to the second wall panel elastic member, and the plurality of second wall panel mass dampers may include two or more types of second wall panel mass dampers having different natural frequencies.

[0009] According to this aspect, it is possible to effectively suppress vibration of the second wall panel, thereby more appropriately improving the sound insulation of the wall structure.

[0010] In the above aspect, the wall structure may further include a substrate (9) fixed to an inner surface (15) of the first wall panel facing the second wall panel, and supporting the first wall panel elastic members of each of the two or more first wall panel mass dampers.

[0011] According to this aspect, a mass damper unit in which multiple first panel mass dampers are attached to a substrate is created before construction, and the created mass damper unit is attached to the first panel during construction, thereby making it easy to attach multiple first panel mass dampers to the first panel.

[0012] In the above aspect, the substrate may be located at the center of an area sandwiched between two adjacent support members on the inner surface of the first wall panel.

[0013] In this embodiment, since the first wall panel is supported by the support members, the center of the area between two adjacent support members on the inner surface of the first wall panel often becomes the antinode of vibration of the first wall panel. In this case, the substrate is positioned at the antinode of vibration with a large amplitude, so that the vibration of the first wall panel 2 can be effectively suppressed. Therefore, the vibration of the first wall panel can be effectively suppressed.

[0014] In the above aspect, the substrate may be provided with m×n first wall panel elastic members of the first wall panel mass dampers arranged in a lattice pattern of m rows and n columns, and each row and each column on the substrate may be provided with a plurality of first wall panel mass dampers, all of which have different natural frequencies.

[0015] According to this aspect, since interference between vibrations of adjacent first wall panel mass dampers on the base plate is suppressed, the first wall panel mass dampers can more effectively suppress vibrations of the first wall panels, thereby effectively suppressing vibrations of the wall structure and appropriately improving the sound insulation of the wall structure.

[0016] In the above aspect, it is preferable that at least one of the substrates is provided with a plurality of mass dampers for the first wall panel, each having a natural frequency included in an octave band having a center frequency equal to a resonant transmission frequency (FT) of the first wall panel and the second wall panel.

[0017] According to this aspect, it is possible to effectively suppress a decrease in sound insulation due to the resonance transmission phenomenon of the wall structure.

[0018] In the above aspect, it is preferable that at least one of the substrates is provided with a plurality of mass dampers for the first wall panel, each having a natural frequency included in an octave band having a center frequency that is the coincidence frequency (FC) of the first wall panel.

[0019] According to this aspect, it is possible to effectively suppress a decrease in sound insulation due to the coincidence effect of the wall structure.

[0020] In the above aspect, at least one of the substrates may be provided with at least one mass damper for the first wall panel, the mass damper having a natural frequency included in an octave band having a center frequency equal to a resonant transmission frequency of the first wall panel and the second wall panel, and at least one mass damper for the first wall panel, the mass damper having a natural frequency included in an octave band having a center frequency equal to a coincidence frequency of the first wall panel.

[0021] According to this aspect, the first wall panel mass damper can effectively suppress vibration of the wall structure, and therefore the sound insulation of the wall structure can be appropriately improved.

[0022] In the above aspect, the first wall panel elastic member and the first wall panel weight may be formed in a plate shape, and the first wall panel weight may be placed on the first wall panel elastic member.

[0023] According to this aspect, the thickness of the first wall panel mass damper can be reduced, and it becomes easy to provide the first wall panel mass damper between the first wall panel and the second wall panel without widening the gap between the first wall panel and the second wall panel.

[0024] In the above aspect, the system may include a plurality of first-type first-wall panel mass dampers having a first natural frequency and a plurality of second-type first-wall panel mass dampers having a second natural frequency different from the first natural frequency, and all of the first-type first-wall panel mass dampers may be arranged so that the natural frequencies of adjacent first-type wall panel mass dampers are different from each other.

[0025] According to this aspect, since interference between vibrations of adjacent first wall panel mass dampers is suppressed, the first wall panel mass dampers can more effectively suppress vibrations of the first wall panels, thereby effectively suppressing vibrations of the wall structure and appropriately improving the sound insulation of the wall structure. [Effects of the Invention]

[0026] The present invention can provide a wall structure that can adequately insulate sound. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic cross-sectional view of a wall structure according to a first embodiment; [Figure 2] Cross-sectional view along line II-II in Figure 1 [Figure 3] Graph showing a relationship between transmission loss and frequency of a wall structure according to an embodiment. [Figure 4] FIG. 10 is a side view showing the configuration of an example mass damper unit according to a modified example. [Figure 5] FIG. 10 is a side view showing the configuration of another example of a mass damper unit according to a modified example. [Figure 6] FIG. 10 is a side view showing the configuration of another example of a mass damper unit according to a modified example. [Figure 7] FIG. 10 is a schematic cross-sectional view of a wall structure according to a second embodiment; [Figure 8] 10 is a schematic cross-sectional view of a wall structure according to a third embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Several embodiments of the present invention will be described below in detail with reference to the drawings. In the following embodiments, a wall structure 1 provided in a building such as an apartment building or an office building will be described.

[0029] First Embodiment <Configuration of wall structure 1> FIG. 1 is a schematic cross-sectional view of a wall structure 1 according to a first embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. As shown in FIGS. 1 and 2, the wall structure 1 includes a first wall panel 2, a second wall panel 3, a plurality of support members 4, mass damper units 5A and 5B, and a mass damper unit 6A. The mass damper units 5A and 5B are collectively referred to as "mass damper unit 5." In FIG. 2, the plurality of support members 4 are indicated by two-dot chain lines.

[0030] The first wall panel 2 and the second wall panel 3 are gypsum boards made of gypsum or the like. The first wall panel 2 and the second wall panel 3 may be made of mortar, concrete, resin, metal, or the like. The second wall panel 3 is arranged parallel to the first wall panel 2 at a predetermined distance. A plurality of support members 4 are provided between the first wall panel 2 and the second wall panel 3. The plurality of support members 4 are studs. The plurality of support members 4 are arranged parallel to one another at a predetermined distance. The first wall panel 2 and the second wall panel 3 are fixed to the plurality of support members 4 with screws 7. The plurality of support members 4 support the first wall panel 2 and the second wall panel 3. The plurality of support members 4 also provide a space for the mass damper unit 5 and the mass damper unit 6A to vibrate.

[0031] The mass damper unit 5 (5A, 5B) has a plurality of mass dampers 8 (8A to 8C, 8D to 8F) and a substrate 9. The mass dampers 8A to 8F (first wall panel mass dampers) are collectively referred to as "mass damper 8."

[0032] The mass damper 8 is supported by the first wall panel 2 via a substrate 9. The mass damper 8 has an elastic member 11 (first wall panel elastic member) supported by the first wall panel 2 via the substrate 9 between two adjacent support members 4, and a weight 12 (first wall panel weight) attached to the elastic member 11. The elastic member 11 and the weight 12 are formed in the shape of a substantially rectangular parallelepiped plate. The weight 12 is placed on the elastic member 11. The elastic member 11 and the weight 12 do not have to be shaped like a plate.

[0033] The elastic member 11 has elasticity. The elastic member 11 may be formed of a spring made of foamed plastic, resin rubber, or metal such as steel. The material of the elastic member 11 is preferably a material with a larger damping constant than the weight 12 so that the elastic member 11 can reduce vibration. The material of the elastic member 11 is preferably a material that has moisture resistance, water repellency, etc., and is highly durable. The weight 12 is formed of a material with high rigidity and a large specific gravity. The material of the weight 12 may be a metal such as steel that has high rigidity, concrete, glass, resin, or gypsum. The material of the weight 12 is preferably a material that is resistant to deformation due to temperature and humidity and that can be easily processed to be thin (for example, glass or stainless steel). The material of the weight 12 is preferably a material that has moisture resistance, water repellency, etc., and is highly durable (for example, glass or stainless steel).

[0034] The vibration of the first wall panel 2 is transmitted to the weight 12, which vibrates, thereby suppressing the vibration of the first wall panel 2. The frequency of the vibration of the first wall panel 2 that can be effectively suppressed by the mass damper 8 is the natural vibration frequency of the mass damper 8. The multiple mass dampers 8 possessed by the wall structure 1 include two or more types of mass dampers 8 with different natural vibration frequencies. The natural vibration frequencies of the mass dampers 8A to 8F are different from one another. As will be described in detail later, the natural vibration frequency of the mass damper 8 is set based on the frequency dependency of the transmission loss of the wall structure 1.

[0035] The substrate 9 is fixed to the inner surface 15 of the first wall panel 2 facing the second wall panel 3. The substrate 9 is located at the center of the area between two adjacent support members 4 on the inner surface 15 of the first wall panel 2. The substrate 9 supports nine (two or more) mass dampers 8 (see FIG. 2). The substrate 9 may be made of resin rubber, metal such as rigid steel, concrete, glass, or plaster. A material that is rigid, resistant to deformation due to humidity or temperature, and easy to form into a thin plate (such as stainless steel) is preferred for the substrate 9, as this facilitates transmission of vibrations from the first wall panel 2 to the mass dampers 8 and is resistant to deterioration.

[0036] The substrate 9 is fixed to the inner surface 15 of the first wall panel 2 with double-sided tape. The use of double-sided tape makes it easy to fix the substrate 9 to the inner surface 15 of the first wall panel 2 so that the substrate 9 and the inner surface 15 of the first wall panel 2 are in close contact with each other. An adhesive may be used to fix the substrate 9 to the inner surface 15 of the first wall panel 2. The double-sided tape or adhesive bonds the plate surface of the substrate 9 to the inner surface 15 of the first wall panel 2. This facilitates transmission of vibrations from the first wall panel 2 to the mass damper 8 via the substrate 9 and prevents the load from the mass damper 8 from concentrating locally on the first wall panel 2, thereby preventing deterioration of the first wall panel 2. Note that, in order to firmly fix the substrate 9 to the first wall panel 2, the four corners of the substrate 9 may be fixed to the first wall panel 2 with screws or tackers.

[0037] The mass damper unit 6A has mass dampers 16A to 16C (mass dampers for the second wall panel) and a substrate 17 (substrate for the second wall panel). The mass dampers 16A to 16C are collectively referred to as "mass damper 16." The mass damper unit 6 differs from the mass damper unit 5 in that the mass damper unit 6 is supported by the second wall panel 3. The materials and mounting method of the mass dampers 16 and substrate 17 are the same as those of the mass damper 8 and substrate 9.

[0038] The mass damper 16 (mass damper for the second wall panel) includes an elastic member 18 (elastic member for the second wall panel) fixed to the second wall panel 3 via a substrate 17 between two adjacent support members 4, and a weight 19 (weight for the second wall panel) attached to the elastic member 18. The wall structure 1 has a plurality of mass dampers 16 including two or more types of mass dampers for the second wall panel with different natural frequencies.

[0039] The mass damper unit 6A is provided on the inner surface 20 of the second wall panel 3 at a position facing the mass damper unit 5A. The natural frequency of the mass damper 16 is the same as the natural frequency of the mass damper 8 that the mass damper 16 faces. The natural frequencies of the mass dampers 16A to 16C of the mass damper unit 6A are the same as the mass dampers 8A to 8C of the mass damper unit 5A. Although not shown, the wall structure 1 has a mass damper unit 6B provided on the inner surface 20 of the second wall panel 3 at a position facing the mass damper unit 5B. Like the mass damper unit 6A, the mass damper unit 6B has mass dampers 16D to 16F (mass dampers for the second wall panel) and a substrate 17 (substrate for the second wall panel). The natural frequencies of the mass dampers 16D to 16F are the same as the mass dampers 8D to 8F of the mass damper unit 5B.

[0040] <Arrangement of mass damper 8 and natural frequency> As shown in Figure 2, nine (m x n) mass dampers 8 are attached to the substrate 9 of the mass damper units 5A and 5B, with elastic members 11 arranged in a 3-row, 3-column (m rows, n columns) grid pattern. A plurality of mass dampers 8, all of which have different natural frequencies, are arranged in each row and column on the substrate 9. For example, three types of mass dampers 8 (8A, 8B, 8C), all of which have different natural frequencies, are attached to the mass damper unit 5A. One mass damper 8A, one mass damper 8B, and one mass damper 8C, all of which have different natural frequencies, are arranged in each row and column on the substrate 9 of the mass damper unit 5A.

[0041] Nine mass dampers 8 are arranged in a 3-row, 3-column grid on the substrate 9. The number of mass dampers 8 in each row and column can be changed. Mounted on the substrate 9 are elastic members 11 (first wall panel elastic members) for m×n mass dampers 8 (first wall panel mass dampers) arranged in a lattice of m rows and n columns, where m and n are integers of 2 or greater. A plurality of mass dampers 8 (first wall panel mass dampers) all with different natural frequencies may be arranged in each row and column on the substrate 9. Note that m and n may be the same number (m=n).

[0042] FIG. 3 is a graph schematically showing the relationship between sound transmission loss and frequency for a structure (hereinafter referred to as the "reference wall structure") in which the weight 12 is removed from the wall structure 1. The horizontal axis of the graph in FIG. 3 represents the frequency of sound projected onto the first wall panel 2 of the reference wall structure. The reference structure has a structure similar to the wall structure 1. However, since the reference structure does not have the weight 12, vibration cannot be suppressed by the weight 12 of the mass damper 8. The relationship between sound transmission loss and frequency for the reference structure shown in the graph in FIG. 3 can be considered to represent the relationship between sound transmission loss and frequency for the wall structure 1 in a case where the mass damper 8 does not suppress vibration. A reference wall structure may be one in which the weight 12 of the wall structure 1 is replaced with a dummy plate. The wall structure 1 and the reference wall structure have a double-wall structure. As shown in the graph in FIG. 3, the sound transmission loss for the wall structure 1 and the reference wall structure is reduced by the resonant transmission phenomenon and the coincidence effect.

[0043] The air layer between the first wall panel 2 and the second wall panel 3 acts like a spring, and vibrations of the first wall panel 2 caused by sound are transmitted through the air layer to the second wall panel 3. The resonance transmission phenomenon is a phenomenon in which the first wall panel 2 and the second wall panel 3 resonate with sound of a specific frequency due to the elasticity of the air layer, thereby reducing the transmission loss for sound of a specific frequency (reducing sound insulation). On the other hand, the coincidence effect is a phenomenon in which the transmission loss for sound of a specific frequency is reduced when the first wall panel 2 vibrates due to sound of a specific frequency (sound resonates with the first wall panel 2).

[0044] In the graph of Fig. 3, the frequency corresponding to the minimum value due to the resonant transmission phenomenon is designated as the resonant transmission frequency FT. The resonant transmission frequency FT is the resonant transmission frequency of the first wall panel 2 and the second wall panel 3. In the graph of Fig. 3, the octave band centered on the resonant transmission frequency FT is a frequency band from frequency FT1 to frequency FT2.

[0045] The mass damper unit 5A has mass dampers 8A, 8B, and 8C. The natural frequency Fa of mass damper 8A, the natural frequency Fb of mass damper 8B, and the natural frequency Fc of mass damper 8C are included in an octave band (frequencies FT1 to FT2) with a resonance transmission frequency FT as the center frequency. This allows the mass damper unit 5A to effectively suppress vibration of the wall structure 1 caused by the resonance transmission phenomenon.

[0046] A plurality of mass dampers 8 (8A, 8B, and 8C) having natural frequencies included in an octave band centered on the resonant transmission frequency FT of the first wall panel 2 and the second wall panel 3 are attached to the base plate 9 of the mass damper unit 5A. As shown in FIG. 2, in the mass damper unit 5A, all of the mass dampers 8 are arranged so that the natural frequencies of adjacent mass dampers 8 are different from each other. This prevents vibrations of adjacent mass dampers 8 from interfering with each other, allowing the mass dampers 8 to effectively suppress vibrations of the first wall panel 2.

[0047] In the graph of FIG. 3, the frequency corresponding to the minimum value due to the coincidence effect is designated as the coincidence frequency FC. The coincidence frequency FC is the coincidence frequency of the first wall panel 2. In the graph of FIG. 3, the octave band centered on the coincidence frequency FC is a frequency band from frequency FC1 to frequency FC2. The mass damper unit 5B has mass dampers 8D, 8E, and 8F. The natural frequency Fd of mass damper 8D, the natural frequency Fe of mass damper 8E, and the natural frequency Fd of mass damper 8D are included in the octave band (frequency FC1 to frequency FC2) centered on the coincidence frequency FC. This allows the mass damper unit 5B to effectively suppress vibration of the wall structure 1 due to the coincidence effect.

[0048] A plurality of mass dampers 8 (8D, 8E, and 8F) having natural frequencies included in an octave band centered on the coincidence frequency FC of the first wall panel 2 are attached to the base plate 9 of the mass damper unit 5B. In the mass damper unit 5B, all of the mass dampers 8 are arranged so that the natural frequencies of adjacent mass dampers 8 are different from each other. This prevents vibrations of adjacent mass dampers 8 from interfering with each other, allowing the mass dampers 8 to effectively suppress vibrations of the first wall panel 2.

[0049] The wall structure 1 includes a plurality of mass dampers 8A (first-class mass dampers for the first wall panel) having a natural frequency Fa (first natural frequency) related to the resonance transmission frequency FT, and a plurality of mass dampers 8D (second-class mass dampers for the first wall panel) having a natural frequency Fd (second natural frequency) related to the coincidence frequency FC, which is different from the natural frequency Fa (first natural frequency). This arrangement suppresses the reduction in sound transmission loss (reduction in sound insulation) of the wall structure 1 due to not only the resonance transmission phenomenon but also the coincidence effect. As shown in FIG. 2 , all of the mass dampers 8 are arranged so that the natural frequencies of adjacent mass dampers 8 are different from each other. By setting the number and arrangement of mass damper units 5, the number and arrangement of mass dampers 8, and the natural frequencies of the mass dampers 8 according to the frequency dependence of the sound transmission loss of the wall structure 1, the wall structure 1 can be provided with appropriate sound insulation.

[0050] <Effect of Wall Structure 1> The actions and effects of the wall structure 1 configured as described above will be described below. The wall structure 1 has a plurality of mass dampers 8 between the first wall panel 2 and the second wall panel 3, including two or more types of mass dampers 8 (mass dampers for the first wall panel) with different natural frequencies. Because the wall structure 1 has two or more types of mass dampers 8 (mass dampers for the first wall panel) with different natural frequencies, the wall structure 1 can improve sound insulation against sounds of a wider range of frequencies compared to a double wall provided with mass dampers 8 with only one type of natural frequency. Therefore, the wall structure 1 can provide appropriate sound insulation.

[0051] The wall structure 1 has a plurality of mass dampers 16, including two or more types of mass dampers 16 (mass dampers for the second wall panel) with different natural frequencies. This effectively suppresses vibration of the second wall panel 3. Therefore, the sound insulation of the wall structure 1 can be more appropriately improved.

[0052] The substrate 9 supports the elastic members 11 of each of the two or more mass dampers 8. By creating a mass damper unit 5 with multiple mass dampers 8 attached to the substrate 9 before construction and attaching the created mass damper unit 5 to the first wall panel 2 during construction, multiple mass dampers 8 can be easily attached to the first wall panel 2. This facilitates attaching multiple mass dampers 8 to the first wall panel 2. Alternatively, the first wall panel 2 with the attached mass damper unit 5 may be created before construction and used at the construction site. This makes it easier to create the wall structure 1 at the construction site. Furthermore, because the surface of the substrate 9 and the inner surface 15 of the first wall panel 2 are joined, vibrations from the first wall panel 2 are more easily transmitted to the mass dampers 8 via the substrate 9, and deterioration of the first wall panel 2 due to a localized concentration of the load from the mass dampers 8 on the first wall panel 2 is suppressed.

[0053] The substrate 9 is located in the center of the area sandwiched between two adjacent support members 4 on the inner surface 15 of the first wall panel 2. Because the first wall panel 2 is supported by the support members 4, the center of the area sandwiched between two adjacent support members 4 on the inner surface 15 of the first wall panel 2 often becomes the antinode of vibration of the first wall panel 2. In this case, since the substrate 9 is located at the antinode of vibration with a large amplitude, the vibration of the first wall panel 2 can be effectively suppressed. Therefore, the vibration of the first wall panel 2 can be effectively suppressed.

[0054] Nine (m×n) mass dampers 8 are attached to the substrate 9, arranged in a 3-row, 3-column (m-row, n-column) grid pattern, with multiple mass dampers 8, all of which have different natural frequencies, arranged in each row and column on the substrate 9. This prevents vibrations of adjacent mass dampers 8 on the substrate 9 from interfering with each other, allowing the mass dampers 8 to more effectively suppress vibrations of the first wall panel 2. Therefore, vibrations of the wall structure 1 can be effectively suppressed, and the sound insulation of the wall structure 1 can be appropriately improved.

[0055] A plurality of mass dampers 8A, 8B, and 8C having natural frequencies included in an octave band centered on the resonant transmission frequency FT of the first wall panel 2 and the second wall panel 3 are attached to the substrate 9 of the mass damper unit 5A. This effectively prevents a decrease in sound insulation performance of the wall structure 1 due to the resonant transmission phenomenon.

[0056] A plurality of mass dampers 8D, 8E, and 8F having natural frequencies included in an octave band centered on the coincidence frequency FC of the first wall panel 2 are attached to the substrate 9 of the mass damper unit 5B. This effectively prevents a decrease in sound insulation performance of the wall structure 1 due to the coincidence effect.

[0057] The elastic member 11 and the weight 12 are formed in a plate shape, and the weight 12 is placed on the elastic member 11. This allows the thickness of the mass damper 8 to be reduced. This also makes it easy to install the mass damper 8 between the first wall panel 2 and the second wall panel 3 without widening the gap between the first wall panel 2 and the second wall panel 3.

[0058] All of the mass dampers 8 are arranged so that the natural frequencies of adjacent mass dampers 8 are different from each other. This prevents the vibrations of adjacent mass dampers 8 from interfering with each other, allowing the mass dampers 8 to more effectively suppress the vibration of the first wall panel 2. As a result, the vibration of the wall structure 1 can be effectively suppressed, and the sound insulation of the wall structure 1 can be appropriately improved.

[0059] <Modification> The configuration of the wall structure 1 can be modified as appropriate. For example, the configuration of the mass damper unit 5 can be modified as shown in Figs. 4 to 6. Fig. 4 is a side view showing the configuration of a mass damper unit 5C, which is an example of a modified example. The mass damper unit 5C has five mass dampers 8A of the mass damper unit 5A and four mass dampers 8D of the mass damper unit 5B.

[0060] Attached to the substrate 9 of the mass damper unit 5C are a mass damper 8A having a natural frequency Fa included in an octave band centered on the resonant transmission frequency FT (see FIG. 3) of the first wall panel 2 and the second wall panel 3, and a mass damper 8D having a natural frequency Fd included in an octave band centered on the coincidence frequency FC of the first wall panel 2. This allows the mass dampers 8A and 8D to effectively suppress vibrations of the wall structure 1, thereby appropriately improving the sound insulation of the wall structure 1.

[0061] Fig. 5 is a side view showing the configuration of a mass damper unit 5D as another modified example. The mass damper unit 5D is a mass damper unit 5 obtained by omitting the central mass damper 8A from the mass damper unit 5C shown in Fig. 4. As shown in the mass damper unit 5D in Fig. 5, the mass dampers 8 do not have to be arranged in a lattice pattern of m rows and n columns.

[0062] 6 is a side view showing the configuration of a mass damper unit 5E according to another modified example. The mass damper unit 5E is the same as the mass damper unit 5 in which the elastic member 11 and the weight 12 of the mass damper unit 5A are formed in a substantially circular plate shape. The natural frequencies of the mass dampers 8G to 8I of the mass damper unit 5E may be the same as the natural frequencies Fa to Fc of the mass dampers 8A to 8C of the mass damper unit 5A.

[0063] Second Embodiment FIG. 7 is a schematic cross-sectional view of a wall structure 21 according to the second embodiment. The wall structure 21 has a second wall panel 22 made of reinforced concrete instead of the second wall panel 3 made of gypsum board of the wall structure 1 of the embodiment, and no mass damper unit 6 is attached to the second wall panel 22. The configuration of the mass damper unit 5 of the wall structure 21 is the same as that of the wall structure 1 of the first embodiment. Hereinafter, explanations of the configuration of the second embodiment common to the configuration of the first embodiment will be omitted. A gap is provided between the support member 4 and the second wall panel 22. The second wall panel 22 may be, for example, the outer wall of a building.

[0064] Third Embodiment FIG. 8 is a schematic cross-sectional view of a wall structure 31 according to a third embodiment. The wall structure 31 has a second wall panel 22 made of reinforced concrete instead of the second wall panel 3 made of gypsum board of the wall structure 1 of the first embodiment. First wall panels 2 made of gypsum board are provided on both sides of the second wall panel 22, sandwiching the second wall panel 22. Mass damper units 6 are not attached to the second wall panels 22, but mass damper units 5 are attached to the inner surfaces 15 of both first wall panels 2 facing the second wall panel 22. Hereinafter, descriptions of components common to the first embodiment will be omitted. The configuration of the mass damper unit 5 of the wall structure 31 is the same as that of the wall structure 1 of the first embodiment. The second wall panel 22 is made of concrete. A gap is provided between the support member 4 and the second wall panel 22. The wall structure 31 may be, for example, a partition wall of a building.

[0065] The present invention is not limited to the above-described embodiment. The specific configuration, arrangement, quantity, and materials of each member and part can be modified as appropriate without departing from the spirit and scope of the present invention. Furthermore, not all of the components shown in the above-described embodiment are essential and can be selected as appropriate. For example, the vibration modes of the wall structure 1 and the reference wall structure can be analyzed using the finite element method to calculate the positions where the amplitude of the first wall panel 2 and the second wall panel 3 is large. Mass damper units 5 and 6 and mass dampers 8 and 16 can be installed at the calculated positions. This can more appropriately suppress the vibration of the wall structure 1. Furthermore, the natural frequency for the vibration mode of the wall structure 1 and the reference wall structure can be calculated using the finite element method or experiments, and the calculated natural frequency can be used as the natural frequency of the mass dampers 8 and 16. This can more appropriately suppress the vibration of the wall structure 1. [Explanation of symbols]

[0066] 1: Wall structure 2: 1st wall plate 3:Second wall plate 4: Support member 5: Mass damper unit 6: Mass damper unit 8: Mass damper (mass damper for first wall panel) 9: Circuit board 11: Elastic member (elastic member for first wall panel) 12: Weight (weight for the first wall board) 15: Inner surface of first wall panel 16: Mass damper (mass damper for second wall panel) 17: Circuit board 18: Elastic member (elastic member for second wall panel) 19: Weight (weight for second wall plate) 20: Inner surface of second wall panel 21: Wall structure 22:Second wall plate 31: Wall structure FC: Coincidence frequency FT: Resonant transmission frequency

Claims

1. A wall structure provided in a building, a first panel; and a second wall plate arranged parallel to the first wall plate at a predetermined interval; a plurality of support members arranged parallel to each other at predetermined intervals between the first wall panel and the second wall panel, and supporting at least the first wall panel; a first wall panel elastic member supported on the first wall panel between two adjacent support members; and a plurality of first wall panel mass dampers including first wall panel weights attached to the first wall panel elastic member, The plurality of first wall panel mass dampers are of two or more types having different natural frequencies.

2. the second wall panel elastic members are fixed to the second wall panel between two adjacent support members, and a plurality of second wall panel mass dampers are provided, each mass damper including a second wall panel weight attached to the second wall panel elastic members; The wall structure according to claim 1 , wherein the plurality of second wall panel mass dampers include two or more types of second wall panel mass dampers having different natural frequencies.

3. 2. The wall structure according to claim 1, further comprising a substrate fixed to an inner surface of the first wall panel facing the second wall panel, the substrate supporting the first wall panel elastic members of each of the two or more first wall panel mass dampers.

4. The wall structure according to claim 3 , wherein the substrate is located at a center of an area sandwiched between two adjacent support members on the inner surface of the first wall panel.

5. 4. The wall structure according to claim 3, wherein the first wall panel elastic members of the m×n first wall panel mass dampers arranged in a lattice pattern of m rows and n columns are attached to the substrate, and a plurality of the first wall panel mass dampers, all of which have different natural frequencies, are arranged in each row and each column on the substrate.

6. 4. The wall structure according to claim 3, wherein at least one of the substrates is provided with a plurality of mass dampers for the first wall panel, the mass dampers having natural frequencies included in an octave band having a center frequency equal to a resonant transmission frequency of the first wall panel and the second wall panel.

7. 7. The wall structure according to claim 6, wherein at least one of the substrates is provided with a plurality of mass dampers for the first wall panel, the mass dampers having natural frequencies included in an octave band having a center frequency that is the coincidence frequency of the first wall panel.

8. 4. The wall structure according to claim 3, wherein at least one of the substrates is provided with: at least one mass damper for the first wall panel having a natural frequency included in an octave band having a center frequency equal to a resonant transmission frequency of the first wall panel and the second wall panel; and at least one mass damper for the first wall panel having a natural frequency included in an octave band having a center frequency equal to a coincidence frequency of the first wall panel.

9. The first wall panel elastic member and the first wall panel weight are formed in a plate shape, The wall structure according to claim 1 , wherein the first wall panel weight is placed on the first wall panel elastic member.

10. the plurality of first wall panel mass dampers include a plurality of first type first wall panel mass dampers having a first natural frequency and a plurality of second type first wall panel mass dampers having a second natural frequency different from the first natural frequency; 2. The wall structure according to claim 1, wherein all of the first wall panel mass dampers are arranged so that the natural frequencies of adjacent first wall panel mass dampers are different from each other.

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