Wall construction

Abstract

To provide a false wall allowing sound insulation performance to be improved and constraint for facilities to be installed in a space part to be reduced.SOLUTION: A false wall structure 1 is provided with partition walls 2, substrate material 3 fixed on outer sides of the false walls 2, and false walls 4 arranged on both side of the partition wall with a space therebetween through the substrate material 3. A plurality of resonance pipes 5 with a unique resonance frequency having a plurality of holes 8 formed along a longitudinal direction are attached along the substrate material 3 in a space 6 surrounded by the partition walls 2, the substrate material 3, and the false walls 4, configuring to occupy 5 to 50% cubic volume of the space 6 with the resonance pipes 5 and allowing sound insulation performance to be improved and constraint for facilities to be installed in the space 6 to be reduced.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a structure in which a false wall is installed with a space provided on one or both sides of a partition wall in a building, and in particular to a false wall structure that can improve sound insulation performance in a specific sound range. [Background technology]

[0002] In order to hide renovations and interior wiring, a false wall structure is used in which a false wall is installed with a space provided as a partition wall (including boundary walls) in apartment buildings, hotels, etc. In such a false wall structure, the air layer existing in the space acts as a spring, and this air spring effect causes resonant transmission, resulting in a decrease in sound insulation performance at low frequencies. For this reason, it is known that a false wall structure 101, as shown in Figure 11, has inferior sound insulation performance to a structure 100 without a false wall, even though it is a structure with an additional wall on the outside of the partition wall.

[0003] Since the deterioration of sound insulation performance is caused by the air gap created by the false wall, a method is taken to prevent the deterioration of sound insulation performance by filling this air gap with sound absorbing or insulating material and suppressing the air spring effect. However, filling the air gap with sound absorbing or insulating material requires costs for the sound absorbing or insulating material as well as construction costs.

[0004] The following techniques have been considered as methods for preventing the deterioration of sound insulation performance due to the air spring effect. Patent Document 1 describes a hollow double sound insulation wall structure in which a predetermined number of hollow sound absorbing materials with specific resonance frequencies are arranged in the hollow space between a pair of wall elements.

[0005] In Patent Document 2, in a double wall structure in which a wall panel is attached to one or both sides of a partition wall via a stud material, the distance between the partition wall and the wall panel is set to within 30 mm, and the surface density of the wall panel is set to 4 kg / m 2 The following soundproof double wall structure is described.

[0006] The dry construction partition wall structure described in Patent Document 3 is composed of a fire-resistant central wall and outer walls arranged on either side of it, with a hollow triple wall structure forming a hollow space on either side of the central wall, and has studs that support the central panel portion via acoustic insulating battens, and the outer walls support the outer panel portion via acoustic insulating battens.

[0007] Patent Document 4 describes a partition wall structure having a partition wall constructed by a dry construction method as a continuous wall from the floor structure to the upper floor structure, and a raised wall formed on the side of the partition wall. This structure has an interior board material forming the interior wall surface, a hollow layer formed between the partition wall and the interior board material, and an opening that constantly communicates the hollow layer with the interior space, the attic space, or the underfloor space in a ventilated state.

[0008] Patent Document 5 describes a partition wall structure that includes a stud and panel materials installed on both sides of the stud, and that improves performance in the low-frequency range by providing a number of holes with diameters of 10 to 60 mm at a pitch of 100 to 2000 mm on the side of the stud facing the space where the panel materials are not installed. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2001-3482 A [Patent Document 2] JP 2006-316467 A [Patent Document 3] JP 2010-265645 A [Patent Document 4] JP 2011-032802 A [Patent Document 5] JP 2004-084216 A Summary of the Invention [Problem to be solved by the invention]

[0010] In the structure of Patent Document 1, the space between the pair of wall elements is filled with sound absorbing material and a resonance tube, so the space is narrow, which places restrictions on the equipment and piping to be installed in the space. Furthermore, resonance tubes of various lengths according to frequency are required, which also places restrictions on the space.

[0011] In the structure of Patent Document 2, the surface density of the wall panel is 4 kg / m 2 Because the wall panels are weaker than this, the spacing between the base materials must be narrowed to ensure the strength of the wall. If there is more base material, the usable space will be reduced and the construction burden will increase. Furthermore, the spacing between the parting wall and the wall panel must be within 30 mm, which places restrictions on the equipment and piping that can be installed in the space.

[0012] In the dry construction partition wall structure described in Patent Document 3, the hollow space serving as an air layer is very large, and the sound insulation performance is insufficient. In order to further improve the sound insulation performance, heat insulating materials, etc. are required, which places great restrictions on the hollow space.

[0013] The structure of Patent Document 4 requires adjustments to the connections between the wall and the ceiling and between the wall and the underfloor, which increases the amount of work required for construction, and also requires a lot of work to form openings and maintain the strength of the periphery of these openings. There is a risk that sounds that get into the ceiling or under the floor will reverberate loudly, significantly reducing sound insulation performance.

[0014] In the structure of Patent Document 5, holes are drilled in the studs themselves, and depending on the required performance, the pitch of the studs may need to be narrowed, which narrows the space between the studs and makes construction more labor-intensive.

[0015] In view of the problems in the prior art, the present invention aims to provide a false wall structure that can improve sound insulation performance and reduce restrictions on equipment to be installed in the space. [Means for solving the problem]

[0016] The present invention relates to a false wall structure comprising a partition wall constructed in a building, a base material fixed to the outside of the partition wall, and a false wall installed on either side or both sides of the partition wall with a gap therebetween, the false wall structure further comprising a tubular resonance pipe having a specific resonance frequency attached along the in-plane direction of the partition wall in a space surrounded by the partition wall, the base material, and the false wall. The base material and the resonance tube are partially or completely overlapped in the in-plane direction. The present invention is characterized in that

[0017] According to the present invention, a tubular resonance tube having a specific resonance frequency is attached along the in-plane direction of the partition wall in the space surrounded by the partition wall, the base material, and the false wall, thereby reducing resonance transmission due to the air spring effect inside the false wall, improving sound insulation performance, and reducing restrictions on equipment to be installed in the space.

[0018] It is preferable that a single or multiple holes are formed in the peripheral wall of the resonance tube, penetrating the peripheral wall from the front to the back, thereby making it possible to further improve the sound insulation performance.

[0019] The sound insulation effect can be improved by positioning the hole formed in the resonance tube on the side of the space or by closing the end of the resonance tube.

[0020] The cross-sectional shape of the resonance tube is not limited, but in order to improve sound insulation performance and reduce manufacturing costs, it is preferable that the resonance tube be cylindrical.

[0021] When the resonance tube is cylindrical, it is preferable that the inner diameter of the resonance tube is 10 to 200 mm, the thickness is 0.5 to 5 mm, and the length is 50 to 5000 mm, so that sound insulation performance for low frequency range can be effectively obtained.

[0022] It is preferable that a plurality of the resonance tubes are disposed in the enclosed space. By providing a plurality of the resonance tubes, the resonance effect is enhanced, and the sound insulation performance can be improved significantly.

[0023] The resonance tubes may be arranged in any manner, for example, they may be arranged vertically at intervals in the horizontal direction within the plane of the partition wall, in which case a large space can be secured and restrictions on the equipment to be installed in the space can be greatly reduced.

[0024] For example, the resonance pipe may be attached adjacent to the base material along the base material. In this case, even if the resonance pipe is prone to bending, it can be attached straight along the base material, making installation easier.

[0025] The volume occupancy rate of the resonance tube with respect to the space is preferably 5 to 50%, which not only improves the sound insulation performance but also reduces restrictions on the equipment to be installed in the space.

[0026] By forming a plurality of holes in the peripheral wall of the resonance tube along the longitudinal direction of the resonance tube and setting the pitch of the plurality of holes at 50 to 1000 mm, it is possible to effectively improve sound insulation performance.

[0027] It is preferable that the diameter of the hole formed in the resonance tube is 1 to 70 mm, which makes it possible to effectively obtain sound insulation performance for low-frequency sounds.

[0028] The resonance tubes may be attached to the upper and lower ends, or only to the upper end, or only to the lower end of the enclosed space, facing in the horizontal direction within the plane of the partition wall.

[0029] If the resonance tube is attached by a means that does not require any processing, construction costs can be reduced. Effect of the Invention

[0030] According to the present invention, a tubular resonance tube having a specific resonance frequency is attached along the in-plane direction of the partition wall in the space surrounded by the partition wall, the base material and the false wall, thereby reducing resonance transmission due to the air spring effect inside the false wall, improving sound insulation performance and reducing restrictions on equipment to be installed in the space. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a perspective view of a raised wall structure according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of a raised wall structure. [Diagram 3] FIG. 2 is a vertical cross-sectional view of a raised wall structure. [Figure 4] 10(a) is a partial perspective view of a resonance tube, and FIG. 10(b) is an example in which a lid is formed by folding the end of the paper tube itself. [Diagram 5] FIG. 13 is a diagram showing an example of installing an outlet box in a raised wall structure. [Figure 6] 13 is a diagram showing another example of an outlet box installed in a raised wall structure. FIG. [Figure 7] FIG. 5 is a perspective view of a raised wall structure according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a perspective view of a raised wall structure according to a third embodiment of the present invention. [Figure 9] FIG. 11 is a perspective view of a raised wall structure according to a fourth embodiment of the present invention. [Figure 10] 13(a) to 13(d) are partial perspective views showing other examples of the resonance tube. [Figure 11] 13(a) and 13(b) are partial perspective views showing other examples of the resonance tube. [Figure 12] FIG. 11(b) is a cross-sectional view showing an example in which the resonance tube shown in FIG. 11(a) is provided in a raised wall structure. [Figure 13] 13(a) and 13(b) are cross-sectional views showing an example of a raised wall structure provided with a small-diameter resonance tube. [Figure 14] FIG. 1 is a diagram illustrating that a false wall structure has inferior sound insulation performance to a structure without a false wall. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] An embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of a raised wall structure 1 according to a first embodiment of the present invention, Fig. 2 is a cross-sectional view of the raised wall structure 1, and Fig. 3 is a vertical cross-sectional view of the raised wall structure 1. The raised wall structure 1 of this embodiment includes a partition wall 2 constructed in a building, a plurality of base materials 3 fixed to both outsides of the partition wall 2, raised walls 4 installed on both sides of the partition wall 2 with a gap between them via the base materials 3, and a tubular resonance tube 5 having a specific resonance frequency.

[0033] The partition wall 2 in this embodiment is also called a parting wall, and is a dry type wall made of gypsum board, slate board, sound absorbing material, etc. The structure of the partition wall 2 is not limited, and may be made of, for example, a lightweight steel frame base material such as LGS attached across the upper and lower frameworks of a building, a wall material such as gypsum board provided on the indoor side of this base material, and a sound absorbing / insulating material such as glass wool provided in the space. Note that a detailed description of the structure of the partition wall 2 in this embodiment will be omitted.

[0034] The base material 3 is made of a light-gauge steel frame such as LGS having a rectangular cross section, and is fixed vertically with screws or the like to L-shaped runners or the like fixed to upper and lower frameworks (not shown). As shown in Fig. 2, a plurality of base materials 3 extending vertically are disposed on both sides of the partition wall 2 with slight intervals between them. The plurality of base materials 3 are fixed in parallel at regular intervals in the horizontal direction within the plane of the partition wall 2 on both sides of the partition wall 2. In addition to light-gauge steel, general-purpose products such as wood and resin can be used for the base material 3.

[0035] The raised wall 4 is made of gypsum board, slate board, etc., and is fixed with screws, etc. to the base material 3 fixed to the upper and lower frameworks. The raised wall 4 forms the wall surface of the raised wall structure 1 in contact with the outer surface of the base material 3.

[0036] In the false wall structure 1, there is a wide, flat space 6 surrounded by a partition wall 2, a base material 3, and a false wall 4. Therefore, on each side of the partition wall 2, a plurality of spaces 6 separated by a plurality of base materials 3 are arranged horizontally. This space 6 has a sufficient capacity for installing various facilities such as electrical outlets.

[0037] Two resonance tubes 5 are attached in the vertical direction in each space 6 along the in-plane direction of the partition wall 2. The two resonance tubes 5, 5 attached to the same space 6 are attached parallel to each other along the base materials 3, 3, adjacent to each other on both sides. In other words, these two resonance tubes 5, 5 are arranged in the vertical direction with a large gap between them in the horizontal direction in the plane of the partition wall 2. The volume occupancy rate of the multiple resonance tubes 5 in the space 6 is 5 to 50%.

[0038] In this case, a large space can be secured, and restrictions on the equipment to be installed in the space 6 can be greatly reduced. Furthermore, even if the resonance tube 5 is prone to bending, it can be attached straight along the base material 3, making construction easier. In this embodiment, the resonance tube 5 is attached to the base material 3, but the resonance tube 5 may also be attached to a base or runner provided on the building structure, or to the partition wall 2 or the raised wall 4, and the attachment location is not limited.

[0039] Fig. 4(a) is a partial perspective view of the resonance tube 5. As long as the resonance tube 5 is tubular, its material, shape, and dimensions are not limited. The resonance tube 5 of this embodiment is made of a cylindrical cardboard tube with the same diameter over its entire length, and has approximately the same length as the base material 3 extending from above and below. In addition to a cardboard tube, the material constituting the resonance tube 5 may be resin, metal such as light steel frame, or ceramic. A cardboard tube is most preferable because of its light weight and ease of processing and construction.

[0040] In this embodiment, the cross-sectional shape of the resonance tube 5 is a circle, but it may be a polygon such as a square, and is not limited to this shape. From the viewpoint of workability and installation, a circular cross-sectional shape or a square cross-sectional shape is preferable. A circular cross-sectional shape is most preferable because there are no angular parts in the cross-section, the internal atmospheric pressure is average everywhere on the inner surface, costs are kept down, and high sound insulation performance is obtained.

[0041] Both ends of the resonance tube 5 are closed by lids 7 that close the openings. The lids 7 can be anything that closes the ends of the resonance tube 5, including flexible tape, flat resin plates, metal plates, and paper plates made of the same material as the resonance tube 5. The ends of the resonance tube 5 may be filled with hardened resin. Figure 4(b) shows an example in which the lid 7 is formed by folding the end of the paper tube itself. Note that the figure is drawn with the end facing forward so that the shape of the end of the paper tube can be easily seen. When a paper resonance tube 5 is used, the end of the resonance tube 5 can be easily closed by forming the lid 7 by folding the end of the paper tube itself inward as shown in the figure.

[0042] A plurality of holes 8 penetrating from the front to the back is formed in the peripheral wall 5a of the resonance tube 5. The plurality of holes 8 formed in the peripheral wall 5a are arranged at regular intervals in a straight line along the longitudinal direction of the resonance tube 5. As shown in Fig. 1, the plurality of holes 8 are positioned toward the space 6 surrounded by the partition wall 2, base material 3, and upper wall 4 and parallel to the upper wall 4. In other words, the plurality of holes 8, 8 of the two resonance tubes 5, 5 arranged on both sides of the space 6 are each directed toward the space 6.

[0043] 1 of this embodiment, the multiple holes 8, 8 of the two resonance tubes 5, 5 face each other with the space 6 in between. The positions of the multiple holes 8 are not limited, but in order to effectively absorb vibrations occurring in the space 6, it is preferable that they are positioned toward the space 6 as in this embodiment.

[0044] The tubular resonance tube 5 has an internal cavity and multiple holes 8 formed in the peripheral wall 5a, so that it functions as a Helmholtz resonator with a specific resonance frequency and exhibits sound absorption performance. The sound absorption mechanism exhibited by this resonance tube 5 is that when sound of a specific frequency coming from inside the room hits it, the momentum of the air existing in the small opening of the hole 8 becomes intense, increasing the friction loss there, and it exhibits a mountain-shaped sound absorption characteristic centered on that specific frequency.

[0045] The resonance tube 5 reduces the propagating sound by using the principle of Helmholtz resonance. A plurality of resonance tubes 5 arranged in the space 6 reduces the resonant transmission due to the air spring effect inside the false wall structure 1, reducing the propagating sound and improving the sound insulation performance. Although one resonance tube 5 is sufficient, by arranging a plurality of resonance tubes 5 so that the volume occupancy rate of the resonance tube 5 to the space is 5 to 35%, the sound insulation performance can be effectively improved and the spatial volume inside the false wall can be efficiently utilized.

[0046] In order to reduce construction costs, it is preferable to attach the resonance tube 5 by a method that does not require processing of the resonance tube itself. Specifically, it is possible to use tape, adhesive, or mounting hardware. It is also possible to provide mounting sockets on the upper and lower runners of the resonance tube 5, and insert the end of the resonance tube 5 into the sockets. Furthermore, the outer diameter of the resonance tube 5 may be adjusted to the shape of the fixing part of the resonance tube 5 on the runner, and the end of the resonance tube 5 may be inserted into the fixing part.

[0047] When a paper-tube resonance tube 5 is used, it is lightweight and can be sufficiently attached using adhesive tapes such as double-sided tape or packing tape, or mounting brackets made of thin plates. If attached using these, it can be easily attached without leaving any defects in the partition wall 2, base material 3, and raised wall 4. In this case, since fixing with screws is not necessary, the construction work can be saved and the impact on sound insulation performance can be eliminated. In addition, since no processing is required to attach screws, the impact on sound insulation performance due to the processed parts of the resonance tube 5 or the material to which it is attached can be eliminated. Furthermore, since the paper-tube resonance tube 5 is easy to process, the constructor can easily deform it by making a part concave, etc., according to the conditions at the construction site, and high workability can be obtained.

[0048] The required sound absorption performance differs depending on the thickness of the upper wall 4 from the parting wall to the upper wall, the material, and the construction form. Therefore, the sound absorption performance of the resonance tube 5 is set so as to match the performance value of the sound transmission loss according to the thickness of the upper wall 4. The required sound absorption performance of the resonance tube 5 can be obtained by setting the inner diameter, thickness, number of holes 8, hole diameter, and hole pitch of the resonance tube 5. Each of these dimensions and numbers of the resonance tube 5 are determined based on Helmholtz's resonance theory according to the frequency to be attenuated so as to match the performance value of the sound transmission loss.

[0049] As an example of ranges for obtaining a sound insulation effect for a low frequency range of 250 Hz or less, the resonance tube 5 has an inner diameter of 10 to 200 mm, a thickness of 0.5 to 5 mm, a hole diameter of 1 to 70 mm, and a hole pitch of 50 to 1000 mm. For example, when sound absorption performance (performance value: 125 Hz) is required, the resonance tube 5 made of a paper tube has an inner diameter of 29 to 200 mm, a hole thickness of 0.5 to 5 mm, a hole diameter of 1 to 65 mm, and a hole pitch of 100 mm or more. The length of the resonance tube 5 does not need to be long as long as a predetermined performance can be obtained, and multiple resonance tubes 5 with a length of about 50 to 1000 mm may be installed in combination so that the volume occupation ratio of the resonance tube 5 to the space is 5 to 50%.

[0050] The following are configurations that enhance the resonance effect and improve sound insulation performance: first, one or more resonance tubes 5 are disposed in the space 6, second, one or more holes 8 are formed in the peripheral wall 5a of the resonance tube 5, third, multiple holes 8 are formed along the longitudinal direction of the resonance tube 5, fourth, the hole 8 is positioned on the wider space 6 side, fifth, the end of the resonance tube 5 is closed, and sixth, the cross-sectional shape of the resonance tube 5 is circular.

[0051] In the false wall structure 1 configured as described above, as shown in Fig. 1, a very large space is secured in the space 6 surrounded by the partition wall 2, the base material 3, and the false wall 4. This reduces the constraints on the equipment to be installed in the space 6. Specifically, the secured large space 6 can be quantified by the volume occupancy rate of the resonance tube 5 relative to the capacity of the space 6.

[0052] When the present inventors conducted tests regarding the above occupancy rate, the improvement effect was about 1.5 to 5.5 dB when the volume occupancy rate was 10 to 30%, but was 1.0 dB or less when the volume occupancy rate was less than 5%. Even if the volumetric ratio exceeds 30%, the sound insulation performance is improved, but as the volumetric ratio increases, the space 6 in the false wall 1 becomes narrower, and the dimensions of the objects to be installed in the space 6 in the false wall 1 are limited. For this reason, the volumetric ratio of the resonance tube 5 to the space 6 is preferably in the range of 5 to 50%.

[0053] Fig. 5 is a diagram showing an example of installing an outlet box 10 in a raised wall structure 1. An outlet 11 is provided on the surface of the raised wall 4. The raised wall structure 1 has a sufficiently large space 6, so such equipment can be easily installed. In addition to the outlet box 10, for example, electrical wiring, an outlet, a multi-outlet entrance monitor, a hot water supply controller, a key box, a mailbox, a delivery box, etc. may be installed.

[0054] FIG. 6 is a diagram showing another example in which an outlet box 10 is installed in a raised wall structure 1. The resonance tube 5 does not need to be continuous, and as in this example, the resonance tube 5 may be divided into multiple tubes that are interrupted midway to avoid interference with equipment. If the resonance tube 5 is configured to be interrupted appropriately, the space 6 can be used effectively. As the resonance tube 5 becomes shorter, multiple resonance tubes 5 may be combined and arranged so that the volume occupancy rate of the resonance tube 5 is 5 to 50%.

[0055] For example, the sound insulation performance at 125 Hz in the 1 / 1 octave band is calculated by averaging the measured values ​​of sound transmission loss at 100 Hz, 125 Hz, and 160 Hz in the 1 / 3 octave band. Therefore, by using a resonance tube 5 that is suited to a frequency band among these three frequency bands where the sound transmission loss performance value does not meet the standard, the performance of the frequency band where the performance is insufficient can be effectively improved.

[0056] In the present invention, it is possible to improve the sound insulation performance by adjusting the performance of the resonance tube 5 to the frequency band where the performance is degraded by using the raised wall structure 1. In addition, when there are multiple frequency bands where the performance is degraded by using the raised wall structure 1, it is possible to more effectively improve the sound insulation performance by using a combination of resonance tubes that are adjusted to each frequency band.

[0057] According to the false wall structure 1 of this embodiment, a resonance pipe 5 having a specific resonance frequency is attached to a space 6 surrounded by a partition wall 2, a base material 3, and a false wall 4 along the in-plane direction of the partition wall 2, and the volume occupancy rate of the resonance pipe 5 to the space 6 is 5 to 50%, so that the sound insulation performance is improved and restrictions on the equipment installed in the space 6 can be reduced. Also, the sound insulation performance of a frequency band where sound insulation performance is insufficient is improved, and the sound insulation performance can be significantly improved.

[0058] 7 is a perspective view of a raised wall structure 15 according to a second embodiment of the present invention. This embodiment differs from the first embodiment in that the resonance pipes 5 are attached not only to both left and right ends of the space 6, but also to the lower end of the space 6, facing the in-plane horizontal direction of the partition wall 2. Even in this case, sound insulation performance is improved, and a large space in which equipment can be installed in the space 6 is secured, allowing the space 6 to be used effectively. As another embodiment, the resonance pipes 5 may be attached only to the upper end of the space 6, rather than only to both left and right ends of the space 6.

[0059] 8 is a perspective view of a raised wall structure 16 according to a third embodiment of the present invention. This embodiment differs from the first embodiment in that the resonance tubes 5 are attached not only to both the left and right ends of the space 6, but also to the lower and upper ends of the space 6, facing in the in-plane horizontal direction. Even in this case, sound insulation performance is improved, and a large space in which equipment can be installed in the space 6 is secured, allowing the space 6 to be used effectively.

[0060] 9 is a perspective view of a raised wall structure 17 according to a fourth embodiment of the present invention. This embodiment differs from the first embodiment in that the resonance tubes 5 are attached vertically in the center of the space 6 in the left-right direction in addition to being attached to both left and right ends of the space 6. Even in this case, sound insulation performance is improved and space for installing equipment in the space 6 is secured, allowing the space 6 to be used effectively.

[0061] The scope of the present invention is not limited to the above-mentioned embodiment, but is indicated by the claims, and includes all modifications within the meaning and scope of the claims. Although the partition wall is a dry partition wall made of gypsum board, the present invention is not limited to this, and can be applied to conventionally known structures such as dry partition walls made by combining gypsum board and slate board, RC construction, lightweight aerated concrete, extruded cement board, PC board partition, etc.

[0062] Various configurations of the resonance tube can be implemented. For example, the following resonance tube can be implemented. Fig. 10(a) shows an example in which a plurality of holes 8 are arranged in two rows, Fig. 10(b) shows an example in which the holes 8 are long holes extending in a straight line, Fig. 10(c) shows an example in which a plurality of long holes 8 are formed, and Fig. 10(d) shows an example in which the resonance tube 5 has a rectangular cross section. It is also possible to form a plurality of holes irregularly on the peripheral wall of the resonance tube, or to make the resonance tube not of the same diameter over its entire length but with the diameter changed midway, or to make it a curved or bent resonance tube.

[0063] In addition, the multiple holes 8 do not necessarily need to be arranged in a straight line toward the space as long as they can effectively absorb vibrations. Figures 11(a) and (b) are partial perspective views showing other examples of resonance tubes. Figure 11(a) shows an example in which the multiple holes 8 of the resonance tube 5 are formed in a staggered pattern, and Figure 11(b) shows an example in which the holes 8 are formed in a staggered pattern over a wide circumferential range. Figure 12 is a cross-sectional view showing an example in which the resonance tube 5 shown in Figure 11(b) is provided in a raised wall structure 1. The arrows in Figure 12 indicate the direction in which the holes 8 are open. In addition, the other resonance tubes 5 not marked with arrows also have holes 8 formed in the same direction.

[0064] In the false wall structure 1 of Fig. 12, the multiple holes 8 are formed shifted from the center toward the false wall 4 side and the partition wall 2 side. In this way, if there is a space 6 between the resonance tube 5 and the false wall 4, or between the resonance tube 5 and the partition wall 2, the multiple holes 8 may be disposed on the side of that space. As long as the space is present in a position where an effect can be obtained, it is sufficient that a space exists where the multiple holes 8 are open, and the arrangement of the multiple holes 8 is arbitrary.

[0065] 13(a) and (b) are cross-sectional views showing a wall structure 1 provided with a resonance tube 5 having a smaller diameter than that of the above embodiment. The arrows in FIG. 13(a) and (b) indicate the locations where holes 8 are formed. Note that other resonance tubes 5 not marked with arrows also have holes 8 formed at similar positions. When the resonance tube 5 is provided close to the wall 4, it is possible to form multiple holes 8 in three circumferential directions, as shown in FIG. 13(a), and when the resonance tube 5 is provided away from the wall 4, it is possible to form multiple holes 8 in five circumferential directions, as shown in FIG. 13(b).

[0066] As for the arrangement of the resonance tubes, as long as the space of the raised wall structure can be secured and the desired performance can be obtained, they can be attached in the center of the vertical direction in the horizontal direction in the plane, or they can be attached to the studs fixed to the building structure in a diagonal direction, not just in the parallel or vertical direction as in the above embodiment. Multiple resonance tubes can be arranged in random positions in the space. Other members that are provided as necessary in the raised wall structure can be of any form as long as they do not impair the effects of the present invention. [Explanation of symbols]

[0067] 1, 15, 16, 17 Prefabricated wall structure 2 Partition Wall 3. Base material 4. Raised walls 5 Resonance tube 5a Resonator tube wall 6 Space 7 Lid 8 holes 10. Outlet box 11. Outlet

Claims

1. A false wall structure is provided which includes a partition wall constructed in a building, a base material fixed to the outside of the partition wall, and a false wall installed on either or both sides of the partition wall with a gap between them via the base material. A raised wall structure characterized in that a tubular resonance tube having a specific resonance frequency is attached along the in-plane direction of the partition wall in the space surrounded by the partition wall, the base material, and the raised wall, and the base material and the resonance tube are partially or completely overlapped in the in-plane direction.

2. 2. The wall structure according to claim 1, wherein a single or multiple holes are formed in the peripheral wall of the resonance tube, penetrating the front and back of the peripheral wall.

3. The raised wall structure according to claim 2 , wherein the hole is located on the side of the space.

4. 4. The raised wall structure according to claim 2 or 3, wherein an end of the resonance tube is closed.

5. The raised wall structure according to any one of claims 2 to 4, wherein the resonance tube is cylindrical.

6. The raised wall structure according to claim 5, wherein the resonance tube has an inner diameter of 10 to 200 mm, a thickness of 0.5 to 5 mm, and a length of 50 to 5000 mm.

7. The raised wall structure according to any one of claims 2 to 6, wherein a plurality of the resonance tubes are arranged in the space.

8. The wall structure according to claim 7, wherein the plurality of resonance tubes are arranged vertically and spaced apart from one another in the horizontal direction within the plane of the partition wall.

9. The raised wall structure according to claim 7 , wherein the plurality of resonance tubes are attached along the base material in a state adjacent to the base material.

10. The wall structure according to any one of claims 2 to 7, wherein the resonance tube is attached to the upper end and / or lower end of the space in a horizontal direction within the plane of the partition wall.

11. The raised wall structure according to any one of claims 2 to 10, wherein the volume occupancy rate of the resonance tube with respect to the space is 5 to 50%.

12. A raised wall structure as described in any one of claims 2 to 11, wherein the plurality of holes formed in the peripheral wall of the resonance tube are formed along the longitudinal direction of the resonance tube, and the pitch of the plurality of holes is 50 to 1000 mm.

13. The false wall structure according to any one of claims 2 to 12, wherein the diameter of the hole is 1 to 70 mm.

14. The raised wall structure according to any one of claims 1 to 13, wherein the resonance tube is attached by a means that does not require machining.

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