Vibration damping device

Abstract

To provide a building sound absorbing structure capable of silencing noise regardless of the generation situation of noise or the like while using a vibration damping device.SOLUTION: In the building sound absorbing structure, a vibration damping device is mounted to a face material supporting portion that supports a face material used in a building structure to reduce vibration of the face material due to household noise. The vibration damping device includes: mounting means mounted to the face material supporting portion; face material contacting portion contacting with the face material; and oscillation means oscillating upon reception of transmission of vibration. The oscillation means includes: a fixed region fixed to the face material contacting portion; a vibrating region continuous with the fixed region, having a predetermined interval from the face material contacting portion and formed in a freely vibrating state; and a weight detachably provided in the vibrating region. In the sound absorbing structure, when the vibrating region or the weight is displaced by vibration, a resistance member that exerts a resistance force against displacement is provided so as to be in contact with either the vibrating region or the weight.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a sound-absorbing structure for reducing vibrations in building structures caused by so-called everyday noise, and more particularly to a sound-absorbing structure using a vibration-damping device attached to a surface material support part used to support a wall surface, ceiling, etc. [Background technology]

[0002] In ordinary homes, especially in densely built residential areas or apartment complexes, noise and vibrations generated by neighbors, neighboring rooms, or people living on upper floors are often a problem and a source of neighborhood trouble. These noises and vibrations are caused by sounds generated in everyday life (so-called "life noises"). Depending on lifestyle habits, they can be generated by a variety of sources, such as televisions, musical instruments, conversations, and even footsteps on upper floors. These life noises are transmitted to neighboring rooms, neighboring rooms, or lower floors through vibrations, resulting in unpleasant noises. Furthermore, vibrations generated by opening and closing doors or walking on upper floors are also transmitted to neighboring rooms or lower floors, resulting in unpleasant vibrations.

[0003] To address this issue, conventional building structures have adopted shock-absorbing structures for walls and ceilings or soundproofing materials. However, these measures are designed to interrupt the propagation of vibrations (reduce amplitude) in the vibration transmission system, and do not address the amplification effect caused by sound and vibration resonance. Buildings (especially planar structures) have their own inherent frequency (natural frequency) when vibrating due to their structure. When vibrations are caused by noise or other factors, the amplitude increases when the frequency of the vibrations approaches the building's inherent frequency (natural frequency). Therefore, unless the propagation of vibrations is adequately interrupted, the vibrations will be amplified by resonance, and this has not yet led to a satisfactory elimination of everyday noise and other issues.

[0004] Therefore, in order to reduce the living noise and vibration caused by these resonance phenomena, a plurality of vibration-damping weights (weights attached to rubber dampers, the same hereinafter) are attached to the vibrating member, and the transmitted vibration energy is absorbed by the weights, thereby reducing the amplitude of the living noise and the like by canceling it out (see Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the technique disclosed in Patent Document 1 above directly attaches vibration-damping weights to the vibrating member (wall or ceiling). Therefore, in order to obtain a sufficient vibration-damping effect, a plurality of damping weights must be attached to each vibrating member, and the number thereof has inevitably become enormous. Further, the technique disclosed in Patent Document 2 above attaches a plurality of damping weights to the edge that supports the ceiling (vibrating object). Although it is not a direct attachment to the vibrating object, it has been proposed to absorb the entire vibration of the vibrating object by attaching a plurality of damping weights along the edge. However, in the configuration where the damping weights are provided only at the edge, it has not been easy to sufficiently cancel out the vibration of the vibrating object that is the source of vibration transmission. That is, the edge supports the vibrating object and has a relatively strong structure in the building structure, and cannot sufficiently transmit the vibration propagated from the vibrating object, and the vibration canceled by the damping weight is only a small part of the entire vibration of the vibrating object.

[0007] Attaching a large number of weights in this way is expected to have a vibration damping effect by providing a large number of weights that resist vibration. However, as the number of attachments increases, it becomes very time-consuming to install, and it is not easy to adjust the natural frequency of individual weights. In the case of poor adjustment, the number of dumper weights that can actually function is limited, and there are problems such as the inability to expect a significant vibration reduction effect.

[0008] Therefore, the inventors of the present application developed a vibration damping device provided with an oscillating member on a surface material contact portion capable of contacting a wall surface (see Patent Document 3). This vibration damping device eliminates living noise by the oscillation of the oscillating member so as to cancel out the vibration transmitted from the surface material contact portion. Furthermore, the inventors of the present application developed a vibration damping device filed as Japanese Patent Application No. 2020-044794 and made it possible to improve its vibration damping efficiency.

[0009] By the way, the basic configuration of the vibration damping device having the above-described configuration developed by the inventors of the present application is to be attached to a surface material support portion that supports a surface material used for a building structure to reduce the vibration of the surface material, and includes a mounting means that can be mounted on the surface material support portion, a surface material contact portion that is supported by the mounting means and can contact the surface material, and an oscillating means that is installed on the surface material contact portion and oscillates in response to the transmission of vibration. The mounting means and the surface material contact portion are integrally configured, the surface material contact portion is divided into a fixed region that is partially sandwiched between both the surface material and the surface material support portion and a non-fixed region other than that, and the oscillating means is configured to be fixed to the non-fixed region of the surface material contact portion.

[0010] In the case of the vibration damping device configured as described above, since the mounting means mounted on the face material support portion and the face material contact portion are integrally formed, and the face material contact portion is divided into a fixed region and a non-fixed region, the entire device is in a state fixed to the face material support portion, and the non-fixed region of the face material contact portion and the oscillation means are in a vibratable state. As a result, the non-fixed region of the face material contact portion is in a slightly vibratable state, and the oscillation means can vibrate separately from the face material contact portion while being fixed to the non-fixed region. Therefore, vibrations (vibration energy) generated by living noise or the like are transmitted to the face material contact portion via the face material and the face material support portion, the oscillation means resonates, and acts to absorb and cancel out the vibrations (vibration energy). At this time, the face material contact portion has a natural frequency in a state including the oscillation means, and the oscillation means has a different natural frequency therefrom, so that the resonance points are dispersed and vibration damping against vibrations with a wide range of frequencies is made possible.

[0011] In the oscillation means in the above configuration, by providing a configuration including a fixing region fixed to the face material contact portion, a vibration region formed in a vibration-free state with a predetermined interval from the face material contact portion while being continuous with this fixing region, and a weight detachably provided in this vibration region, the oscillation means is such that the fixing region is integrated with the face material contact portion and vibrates in the same manner when the face material contact portion vibrates. On the other hand, the vibration region can receive the transmission of vibrations continuously from the fixing region, and at that time, it is made possible to vibrate with a natural frequency different from that of the fixing region.

[0012] And by configuring each member except the weight with spring steel, soft vibrations are induced also in the face material contact portion, and while changing the natural frequency by changing the thickness of this spring steel, vibration damping is finally realized by the attenuation of vibrations by the spring steel.

[0013] The vibration damping device with the above configuration aims to reduce vibration by absorbing vibration energy with a weight, which is a heavy object. However, when expecting vibration attenuation by spring steel, it is conceivable that the vibration of the weight may continue for a long time. Therefore, there was concern about the impact of the prolonged vibration on the noise reduction effect such as noise. That is, a sufficient noise reduction effect can be expected for intermittent (single-shot) vibrations, but there was concern that when continuous (multiple times in a short period) vibrations are transmitted, the transmission to the vibration area due to the already transmitted vibration may not be smooth.

[0014] The present invention has been made in view of the above points, and its object is to provide a building sound absorption structure that enables sound absorption regardless of the occurrence situation of noise or the like while using the above-described vibration damping device.

Means for Solving the Problems

[0015] Therefore, the present invention is a sound absorption structure that mounts a vibration damping device on a face material support portion that supports a face material used in a building structure and reduces the vibration of the face material due to living noise. The vibration damping device includes a mounting means that can be mounted on the face material support portion, a face material contact portion that is supported by the mounting means and can contact the face material, and an oscillating means that is installed on the face material contact portion and oscillates in response to the reception of vibration transmission. The oscillating means includes a fixed region fixed to the face material contact portion, a vibration region formed in a state where it is continuous with the fixed region and has a predetermined interval from the face material contact portion and is freely vibratable, and a weight detachably provided in the vibration region. When the vibration region or the weight is displaced by vibration, a resistance member that acts a resistance force against displacement in at least one direction is provided so as to be able to contact either one or both of the vibration region and the weight.

[0016] According to the above configuration, primarily, the oscillation means oscillates upon receiving the vibration transmitted from the surface material contact portion, and operates to cancel out the vibration caused by living noise or the like. This is because the oscillation means resonates (vibrates in resonance) upon receiving the transmission of the vibration of the surface material, and the vibration energy of the surface material moves to the oscillation means, thereby decreasing, and reducing the vibration of the surface material due to noise or the like. Secondarily, the resistance member absorbs the vibration of the vibration region or the weight due to the vibration of the oscillation means, and disperses the vibration energy at an early stage. As a result, even in a situation where the surface material continuously vibrates, the vibration is appropriately absorbed, and the transmission of noise is eliminated.

[0017] Here, the surface material is, in the case of the ceiling, a ceiling board (ceiling material or ceiling finishing material, etc.), and in the case of the wall surface, a wall board (wall surface material or wall surface finishing material, etc.), and a gypsum board or the like is used. The surface material support portion is, in the case of the ceiling, a base rail such as a soffit, and in the case of the wall surface, a base rail such as a stud or a body edge, which may be a wooden rail or a lightweight steel rail. Such base rails are arranged at appropriate intervals on the ceiling surface and the wall surface, and an appropriate number of vibration damping devices can be attached to each individual base rail.

[0018] In the invention having the above configuration, the resistance member is an elastic member that is arbitrarily arranged in one or more of the following: between the surface material contact portion or the fixing region and the vibration region, between adjacent vibration regions of a plurality of vibration regions, or between the surface material contact portion and the weight. When the vibration region or the weight is displaced in a direction approaching the fixing region or the surface material contact portion, the elastic member can act a resistance force against the displacement.

[0019] In the case of such a configuration, when the vibration region or the weight is displaced due to vibration, among the displacements, in a state of approaching the fixing region or the surface material contact portion, a resistance force against the displacement is acted by the elastic force of the elastic member, and the vibration of the vibration region or the weight can be absorbed.

[0020] In this case, as the resistance member, glass wool which is disposed on the back side of the facing material and has appropriate elasticity as a whole can be used, and instead of the elastic member, this glass wool can be used. Further, this glass wool can be configured to be disposed together with the elastic member. In any case, the glass wool is disposed in a state where it can contact either one or both of the vibration region or the weight, and when the vibration region moves away from the fixing region or the weight moves away from the facing material contact portion, the glass wool is configured to apply a resistance force against the displacement.

[0021] In the case of the above configuration, the glass wool installed for the purpose of obtaining a heat insulation effect can be also used as the resistance member. And such glass wool for heat insulation etc. is laminated on the entire surface on the back side of the facing material (the side where the facing material is supported by the facing material support portion), and thus it will naturally be installed also in the vicinity where the oscillation means exists. Therefore, by intentionally providing this glass wool in a state of being in contact with the vibration region or the weight, a resistance force due to the elasticity exhibited by the entire glass wool is applied. At this time, since the oscillation means is located between the facing material and the glass wool, when the vibration region or the weight is displaced so as to move away from the facing material, a resistance force will act. Therefore, the displacement of the vibration region or the weight is reduced, and the vibration of the vibration region or the weight can be absorbed.

[0022] Here, when using glass wool instead of the elastic member, when the vibration region is displaced in the direction of moving away from the fixing region, or when the weight is displaced in the direction of moving away from the facing material contact portion, a resistance force against the displacement is applied, and the vibration is absorbed by suppressing the displacement in one direction. On the other hand, when using glass wool together with the elastic member, a resistance force is applied against the displacement in both directions due to the vibration of the vibration region or the weight, and the vibration of the vibration region or the weight can be absorbed by both of them.

[0023] Each resistance member in the above configuration can be selectively provided with different elastic characteristics for each vibration damping device attached to the face material support portion. That is, when a plurality of vibration damping devices are installed for the same face material, by changing the weight of the weight used for each vibration damping device, the vibration characteristics (resonance frequency) of the oscillation means change, so a suitable resistance force is imparted for each vibration characteristic. For example, in order to correspond to a high frequency (high vibration frequency), since the weight is lightened, a member with a weak elastic force is used to weaken the resistance force. Conversely, in order to correspond to a low frequency (low vibration frequency), since the weight is increased, a member with a strong elastic force is used to increase the resistance force. In this case, when absorbing sound against living noise, since the vibration frequency transmitted is 250 Hz or less, it can be configured to divide the frequency band into a plurality (for example, 5 divisions) and reduce the vibration frequency every 50 Hz.

[0024] On the other hand, each resistance member in the above configuration can be selectively provided with different elastic characteristics for each face material, and the elastic characteristics can be selectively used from at least four types.

[0025] Here, "for each face material" means for each type of face material used for the faces (ceiling, floor, wall, etc.) constituting the room (for example, for each ceiling, for each wall surface), and also means each face material (for example, for each of the plurality of face materials constituting the ceiling) when a plurality of face materials are used for one type of face (ceiling, floor, wall, etc.).

[0026] When using resistance members with different elastic characteristics for each face material when a type of face (such as a ceiling) is composed of a plurality of face materials, it functions similarly to the case of making the elastic characteristics different for each vibration damping device. That is, although the vibration frequencies to be sound-absorbed are different for each face material, various frequencies can be corresponded to in the whole face (such as a ceiling). On the other hand, when using resistance members with different elastic characteristics for each type of face material, it can be selected according to the state of the noise transmitted to each face.

[0027] In addition, when selecting from among four or more different elastic characteristics, as described above, when absorbing ambient noise, the transmitted vibration frequency is set to 250 Hz or less, and the 30 Hz to 100 Hz band, which is difficult to absorb, is divided into two, and can be classified into two types of 30 Hz to 65 Hz and 65 Hz to 100 Hz, and two additional types of 30 Hz or less and 100 Hz or more. Naturally, it may be five types divided every 50 Hz in the same manner as described above.

Advantages of the Invention

[0028] According to the present invention, vibrations caused by noise or the like transmitted from the surface material are transmitted by the vibration of the vibration damping device including the weight, and the vibration energy thereof is transmitted, so that the vibration of the surface material itself is reduced. Further, by installing the resistance member, the vibration of the vibration damping device (vibration in the vibration region or vibration of the weight) is dispersed early, and the vibration can be attenuated, so that it is possible to absorb ambient noise that continuously occurs. Further, since it is possible to similarly absorb intermittent (single-shot) noise, it is possible to appropriately absorb noise regardless of the occurrence situation of noise or the like.

[0029] In addition, when the elastic characteristics of the elastic member or glass wool used as the resistance member are made different according to the vibration frequency (vibration number) of the vibration damping device, a wide range of types of noise that generate various vibration frequencies (vibration numbers) is covered, and the vibration in each frequency band is vibration-damped, so that it is possible to obtain a sound absorption effect for various types of noise. This also contributes to appropriately absorbing noise regardless of the occurrence situation of noise or the like.

Brief Description of the Drawings

[0030]

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Modes for Carrying Out the Invention

[0031] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <Premises and Overview> First, an overview of the vibration damping device used in the present invention will be described. FIG. 1 is a diagram showing the structure of a building to which the vibration control device is attached. The figure shows an example in which the vibration control device 1 is attached, with the facing material 11 as the ceiling material and the facing material support portion 12 as the soffit. The facing material support portion (soffit) 12 in the figure is shown as being made of wood, but there are also those made of aluminum or lightweight steel framing. By using a wall surface material instead of the ceiling material and a wall base rail instead of the soffit, it can be used in the same way for the wall surface, but a typical example shows the ceiling structure. As a general ceiling structure, as shown in the figure, the soffit support 15 is supported by a hanger 14 attached to the lower part of a suspension bolt 13 provided on a beam or the like of the building, and the soffit (facing material support portion 12) is supported by a connecting fitting (clip or the like) 16 between this soffit support 15. The vibration control device 1 is supported by a base rail (facing material support portion) 12 such as a soffit, and is installed on the back side rather than the front side of the ceiling or wall surface.

[0032] The exemplified vibration control device 1 is attached to the above-mentioned facing material support portion (soffit or the like) 12, and a part of the vibration control device 1 is sandwiched between the facing material (ceiling material or the like) 11 and the facing material support portion (soffit or the like) 12. The facing material (ceiling material or the like) 11 used in a general building structure is firmly fixed to the facing material support portion (soffit or the like) 12 by a number of screws or the like, and the final sandwiched state can be strong.

[0033] <Configuration of each part of the vibration control device> Here, the details of the exemplified vibration control device 1 will be described. FIG. 2 is an exploded perspective view of the vibration control device 1. As shown in this figure, the exemplified vibration control device 1 is roughly composed of a facing material contact portion 2 and an oscillation means 3. The mounting means 4 for mounting on the above-mentioned facing material support portion (soffit or the like) 12 is composed of strip-shaped mounting members 41, 42, 43 extending from the facing material contact portion 2.

[0034] The surface material contact portion 2 is configured as a thin flat plate as a whole, and the surface material (ceiling material or the like) 11 is arranged on the lower surface side (back surface side) thereof so as to be in a contactable state. The mounting means 4 is constituted by the same member as the surface material contact portion 2. The mounting means 4 (mounting members 41, 42, 43) has two mounting members 41, 42 extending from both sides of the extending base edge 21 of the surface material contact portion 2, and a mounting member 43 is formed near the center of the extending base edge 21, which extends while being bent in a state including a part of the base edge 21. With such a configuration, the exemplified mounting means 4 has a continuous integral configuration made of the same material as the surface material contact portion 2.

[0035] Here, of the above-mentioned mounting members 41, 42, 43, the two 41, 42 located on both sides are arranged on the lower surface side (the side contacting the surface material) of the surface material support portion (field edge or the like) 12, and the one 43 in the center is arranged on the upper surface side. The two can be mounted by gripping the surface material support portion (field edge or the like) 12 from both sides. Locking portions 44, 45, 46 are provided at the tips of the respective mounting members 41, 42, 43, and they contact the side surface of the surface material support portion (field edge or the like) 12 together with the rising base portion 47 of the central mounting member (mounting member for the upper surface) 43 to stabilize the mounted state.

[0036] Since the rising base portion 47 of the upper surface mounting member 43 located in the center is formed by being bent in a state including the extending base edge 21 of the surface material contact portion 2, the lower end edge portion 48 thereof is located at a position offset by a predetermined interval C backward in the extending direction from the extending base edge 21 of the surface material contact portion 2. Therefore, in the state of being mounted on the surface material support portion (field edge or the like) 12 by the mounting means 4, in the surface (upper surface) of the surface material contact portion 2, the range from the position of the extending base edge 21 to the position of the lower end edge portion 48 (the range of the predetermined interval C) is arranged on the lower surface of the surface material support portion (field edge or the like) 12.

[0037] As a result, the facing material (such as a ceiling material) 11 is fixed to the lower surface side of the facing material support portion (such as a field edge) 12, and thus this region is sandwiched by these two members. And since this region is fixed by being sandwiched, it is defined as a fixed region 20a. Here, the fixed region 20a includes a part of the mounting members (mounting members for the lower surface) 41 and 42 on both sides.

[0038] Further, in the facing material contact portion 2, a region 20b is formed which is not directly involved in the mounting to the facing material support portion (such as a field edge) 12. Since this region 20b is not fixed by the facing material support portion (such as a field edge) 12, it is a non-fixed region. And at an appropriate position in this non-fixed region 20b, a planned fixing region 22 for fixing the oscillation means 3 is formed. The planned fixing region 22 does not have any special structural features, and a region corresponding to the area where the oscillation means 3 can be fixed is secured.

[0039] The oscillation means 3 in the illustrated vibration damping device 1 is configured to include a vibration member 5 and a weight 6. The vibration member 5 is configured as a structure composed of three layers, namely a lower layer 51, a middle layer 52, and an upper layer 53, where the whole is a single member curved in an arc shape (substantially U-shaped) at two locations and having an appropriate interval therebetween. The lower layer 51 is the portion fixed to the planned fixing region 22 of the facing material contact portion 2. In that sense, the lower layer 51 becomes the fixing region of the oscillation means 3. When this fixing region 51 is fixed to the facing material contact portion 2, the vibration of this region 51 is restricted, but since its upper layer (the middle layer 52 and the upper layer 53) can vibrate, these become the vibration regions. It should be noted that the vibration in the vibration region is mainly due to the curved portions 54 and 55 located on both sides of the middle layer 52 vibrating as a whole due to the change in their curvature, rather than the middle layer 52 and the upper layer 53 themselves vibrating.

[0040] Further, a weight 6 is installed on the upper layer 53 to serve as the oscillation means 3, and this upper layer 53 is composed of a flat surface portion on which the weight 6 can be mounted. On this flat surface portion, a plurality (two in the figure) of long holes 56, 57 are provided for fixing the weight 6 and for adjusting the installation state.

[0041] The other weight 6 is formed by integrating a plurality of weight components 60a, ···, 60d that are identically configured for weight adjustment. On its surface, a plurality (two in the figure) of through holes 61, 62 are provided, and it is fixed while simultaneously inserting through the long holes 56, 57 provided in the upper layer 53 of the vibration member 5 by rivets 63, 64 or other fastening fittings.

[0042] <Overall Configuration of Vibration Damping Device> As shown in FIG. 3(a), with the respective members configured as described above, in the exemplary vibration damping device 1, the oscillation means 3 is fixed to the non-fixed region 20b with the surface material contact portion 2 as the center, and the mounting means 4 using a part of the fixed region 20a is formed, and the whole is integrally configured. By forming all the other members except the weight 6 of these respective members with spring steel, these members can be vibrated. Further, since the mounting members 41, 42, 43 formed by extending the surface material contact portion 2 are composed of the same spring steel, the extended portions can be relatively easily elastically deformed (bent), and due to this elastic deformation, it can be easily mounted on the surface material support portion (such as the edge) 12.

[0043] Thus, the state in which the mounting members 41, 42, and 43 are mounted on the face material support portion (such as the edge) 12 while being elastically deformed is shown in Fig. 3(b). As shown in this figure, the mounting members 41, 42, and 43 are respectively arranged on the upper surface side and the lower surface side of the face material support portion (such as the edge) 12, and the locking portions 44, 45, and 46 formed at the respective tips lock the side surfaces of the face material support portion (such as the edge) 12. As a result, the side of the face material support portion (such as the edge) 12 is positioned between the locking portions 44, 45, and 46 and the rising base portion 47 of the upper surface mounting member 43, and as a whole, the face material support portion (such as the edge) 12 is in a state of being gripped.

[0044] Due to the above mounting state, the fixed region 20a of the face material contact portion 2 is arranged on the lower surface side of the face material support portion (such as the edge) 12, and further, by installing the face material (such as the ceiling material) 11, the fixed region 20a is in a state of being sandwiched by the face material (such as the ceiling material) 11. Since the other members except the weight 6 are made of spring steel, each member can vibrate, but the portion (fixed region) 20a sandwiched as described above is in a state where it cannot vibrate (or is greatly restricted). Also, the lower layer (fixed region) 51 of the vibration member 5 fixed to the face material contact portion 2 is in a laminated state due to being fixed to the surface of the face material contact portion 2, so the vibration is restricted.

[0045] On the other hand, the other region of the face material contact portion 2 (the non-fixed region 20b where the oscillation means 3 is not fixed) is in a state where it can vibrate, and the portion excluding the lower layer 51 of the vibration member 5 constituting the oscillation means 3, particularly the middle layer 52 and the curved portions 54, 55 on both sides thereof, are in a state where they can vibrate freely because there is no contact with the restricted members. Note that the vibration characteristics can be changed by making the face material contact portion 2 and the vibration member 5 have different wall thicknesses (for example, making the vibration member 5 thick).

[0046] Note that since a part (fixed region 20a) of the surface material contact portion 2 is sandwiched between the surface material support portion (such as a skirting board) 12 and the surface material (such as a ceiling material) 11, a gap of about the thickness of the surface material contact portion 2 will be generated between the two. In this case, since the ceiling material or wall material to be installed as the surface material 11 is a gypsum board or the like, if it is 0.6 mm or less between the two members, it will not be regarded as a special foreign object. Therefore, the exemplary surface material contact portion is in the range of 0.3 mm to 0.6 mm with spring steel. By using spring steel, it is possible to have a structure that has a high restoring force (elastic force) while being thin-walled.

[0047] Since such a mounting method of the vibration damping device 1 is possible, the entire vibration damping device 1 can be easily mounted only by mounting the mounting means 4 on the surface material support portion (such as a skirting board) 12.

[0048] <Operating Principle of Vibration Damping Device> The exemplary vibration damping device 1 is mounted on the surface material support portion (such as a skirting board) 12 in the above state, and since the fixed region 20a is sandwiched between the surface material (such as a ceiling material) 11 and the surface material support portion (such as a skirting board) 12, as shown in Fig. 4(a), the oscillation means 3 can be vibrated while the surface material contact portion 2 maintains contact with the surface material (such as a ceiling material) 11. The vibration of this oscillation means 3 is due to resonance when the surface material (such as a ceiling material) 11 vibrates based on living noise or the like. That is, living noise or the like vibrates the surface material (such as a ceiling material) 11, and the vibration is transmitted from the surface material (such as a ceiling material) 11 to the oscillation means 3 through the surface material contact portion 2. At this time, when the frequency of the transmitted vibration coincides with the natural frequency of the entire oscillation means, the oscillation means 3 resonates and vibrates at the same frequency. When this oscillation means vibrates, the vibration energy of the surface material (such as a ceiling material) 11 is absorbed by the oscillation means 3, the vibration energy of the surface material (such as a ceiling material) 11 is attenuated, and a vibration damping effect is exerted. As a result, living noise or the like can be silenced.

[0049] When the oscillating means 3 oscillates at its natural frequency as described above, the facing material contact portion 2 functions as a transmission member for transmitting the vibration of the facing material (such as a ceiling material) 11. On the other hand, the state shown in Fig. 4(b) indicates a state in which the facing material contact portion 2 oscillates slightly.

[0050] That is, as shown in Fig. 4(b), the facing material (such as a ceiling material) 11 is supported by a facing material support portion (such as a furring strip) 12, and generally, a gypsum board or the like is fastened with screws or the like. Therefore, when the facing material (such as a ceiling material) 11 vibrates due to living noise or the like, the vibration is transmitted to the facing material support portion (such as a furring strip) 12. However, since the facing material support portion (such as a furring strip) 12 does not vibrate significantly, only the facing material (such as a ceiling material) 11 repeats the amplitude. Therefore, the vibration transmitted to the facing material support portion (such as a furring strip) 12 is transmitted to the facing material contact portion 2 through the fixed region 20a of the facing material contact portion 2. Although it is also in a state of being directly transmitted from the facing material (such as a ceiling material) 11, here, attention is paid only to the vibration transmitted from the facing material support portion (such as a furring strip) 12. Then, when the fixed region 20a fixed by the facing material support portion (such as a furring strip) 12 receives vibration, it will naturally be transmitted to the non-fixed region 20b, and the entire non-fixed region 20b of the facing material contact portion 2 (that is, a part of the facing material contact portion 2 and the portion by the oscillating means 3) is vibrated. And the non-fixed region 20b can be moderately deflected (for example, deflected within the range of the gap H in the figure) within the elastic force range of the spring steel with respect to the fixed region 20a, and vibration within that range is possible. At this time, since the natural frequency of the entire non-fixed region 20b is different from the natural frequency of only the oscillating means 3, it is possible to resonate at different frequencies.

[0051] Also, as described above (as shown in Fig. 4(a)), when the oscillation means 3 oscillates, the inertial force generated along with the oscillation will induce oscillation with respect to the face material contact portion 2. On the other hand, when the face material contact portion 2 as shown in Fig. 4(b) oscillates, the inertial force will induce the oscillation of the oscillation means 3. Therefore, resonance can occur at a frequency within the range of the natural frequency of only the oscillation means 3 and the natural frequency of the entire non-fixed region 20b of the face material contact portion 2. That is, in addition to the case where either one oscillates, when both oscillate, resonance can occur according to the intermediate frequency.

[0052] The oscillation of the face material contact portion 2 as described above has been experimentally clarified to vary the natural frequency of the entire non-fixed region 20b due to the different fixed states of the fixed region 20a. This is the case where the face material contact portion 2 is made of spring steel. When the fixed region 20a is firmly fixed, the boundary between the oscillating region and the non-oscillating region becomes clear, but in the case of a loose fixed state, the boundary width becomes large, which is assumed to affect the frequency.

[0053] <First Embodiment> Therefore, the first embodiment of the present invention will be described. Fig. 5 is a diagram showing the configuration of this embodiment. Fig. 5(a) shows a state where the elastic member 7 is attached to the vibration damping device 1, and Fig. 5(b) shows the sound absorption structure in a front view of a state where the vibration damping device 1 is installed on the face material support portion (such as a furring strip) 12.

[0054] As shown in this figure, this embodiment uses the vibration damping device 1 configured as exemplified above, and an elastic member 7(7a, 7b) is attached between the face material contact portion 2 and the weight 6. This elastic member 7 is fixed to the face material contact portion 2 and is not fixed to the weight 6, and is in a state where it can be in direct contact with the weight 6. In order to make the elastic member 7 contactable with the weight 6, the elastic member 7 is provided in a state of avoiding the portion where the vibration member 5 is disposed. Specifically, the weight 6 is provided to be long in the width direction X of the vibration member 5, and extends from both ends thereof to both sides, and the extended portions 65, 66 are utilized. On the other hand, the elastic members 7 are divided and arranged on both sides of the vibration member 5, and are provided so as to be in a state where they can be in direct contact with the lower surface portion of the weight 6 while avoiding contact with the vibration member 5.

[0055] Note that the two elastic members 7a, 7b to be divided and arranged are of the same type and the same size, and the elastic characteristics of the two elastic members 7a, 7b are made uniform. Also, since the upper surface portion of each elastic member 7a, 7b only needs to be able to contact the lower surface portion of the weight 6, it does not have to be a smooth surface or a flat surface, but in order to evenly receive the vibration of the weight 6, a flat surface is preferably used. Further, the upper surface portion of the elastic member 7(7a, 7b) may have the same area as the lower surface portion of the extended portions 65, 66 of the weight 6, but in consideration of the case where the vibration direction of the weight 6 becomes a biased direction, in order to obtain a reliable contact state, the upper surface portion of the elastic member 7(7a, 7b) is provided to be larger than the extended portions 65, 66. The extended portions 65, 66 of the weight 6 are configured to be able to contact at least a part of the upper surface of the elastic member 7(7a, 7b).

[0056] Incidentally, vibrations generated by noise or the like are transmitted to the vibration damping device 1 and attenuated by the oscillation means 3 vibrating. However, the center of the vibration by the oscillation means 3 is due to the vibration of the weight 6. The vibration of this weight 6 is due to the repetition of the deformation of the vibration regions 52 and 53 of the vibration member 5 (particularly the change in the curvature of the curved portions 54 and 55, see Fig. 3(b)). During the continuation of the vibration of the oscillation means 3, the vibration member 5 maintains the state of supporting the weight 6. Therefore, in the vibration state of the oscillation means 3, if only the relationship between the face material contact portion 2 and the weight 6 is observed, the distance between the two will change (repeating approach and separation). Therefore, in order to attenuate the vibration of the oscillation means 3, it can be achieved by applying a predetermined resistance force to the weight 6. For this purpose, the elastic member 7 is provided so as to be in contact with the weight 6.

[0057] The elastic members 7 (7a, 7b) are fixed to the face material contact portion 2 and are not fixed to the weight 6. Therefore, when the weight 6 vibrates, it does not contact the elastic members 7 (7a, 7b) when separating from the face material contact portion 2, and contacts only when approaching the face material contact portion 2. Therefore, the elastic members 7 (7a, 7b) used only need to act a resistance force in the opposite direction by the elastic force (restoring force) while being deformed under the compression force when compressed by the weight 6 between the face material contact portion 2 and the weight 6, and there is no need to act a repulsive force that biases in the reverse direction.

[0058] Therefore, as the elastic members 7 (7a, 7b) in the present embodiment, for example, rod-shaped glass wool is assumed. In order to obtain the same kind of elastic force, low-rebound urethane foam or the like can be used. By using these materials, it can be easily interposed between the face material contact portion 2 and the weight 6, and an appropriate resistance force can be applied along with the deformation during compression. Note that as long as it can act as an appropriate resistance force without significantly rebounding, it may be constituted by a low-rebound silicone resin, synthetic rubber, or the like.

[0059] In the vibration damping device 1 used in this embodiment, as described above, since the weight 6 is integrated by being installed (fixed) on the upper layer 53 of the vibration member 5, the displacement of the weight 6 will coincide with the displacement of the upper layer 53. Therefore, the upper layer 53 of the vibration member 5 can be regarded as the same as the weight 6.

[0060] From such a perspective, for example, as shown in FIG. 6, instead of the lower surface side of the weight 6, the elastic members 7 (7a, 7b) may be provided in a state where they can contact the lower surface of the upper layer 53 of the vibration member 5. Note that FIG. 6(a) is a view in which the weight 6 is omitted, and in this figure, a sound absorption structure is configured in a state where the weight 6 is fixed to the upper layer 53.

[0061] In order to achieve such a configuration, the upper layer 53 of the vibration member 5 is provided to be long in the width direction X of the vibration member 5, and extension portions 53a, 53b are provided with both ends extending outward. Similar to the extension portions 65, 66 of the weight 6, the elastic members 7 (7a, 7b) are arranged in a state of being divided on both sides of the lower layer 51 and the middle layer 52 of the vibration member 5, and the upper surface portions of the elastic members 7 (7a, 7b) are in a state where they can contact the lower surface portion of the upper layer 53. Note that the bottom surface side of the elastic members 7 (7a, 7b) is to be fixed to the surface material contact portion 2.

[0062] Thereby, the elastic members 7 (7a, 7b) are arranged between the surface material contact portion 2 and the upper layer 53 of the vibration member 5. When the upper layer 53 is displaced so as to approach the surface material contact portion 2, the elastic members 7 (7a, 7b) will be compressed, and an appropriate resistance force can be applied to the upper layer 53 during this compression. This resistance force will act as a resistance force against the weight 6 as a result.

[0063] <Operating Mode> Next, the operation mode of the present embodiment with the above configuration will be described. FIG. 7 shows the state when the oscillation means 3 vibrates, and is shown in a right side view of the vibration damping device 1. Note that FIG. 7(a) shows the state before vibration, and FIGS. 7(b) and (c) show the vibration state. Also, although only the form in which the upper surface portion of the elastic members 7(7a, 7b) can contact the lower surface portion of the weight 6 is shown, the operation mode can be regarded as the same for the form in which the upper surface portion of the elastic members 7(7a, 7b) can contact the upper layer 53 of the vibrating member 5. Therefore, here, only the form in which it can contact the lower surface portion of the weight 6 will be illustrated and described.

[0064] First, as described above, the state before the oscillation means 3 vibrates is a state in which a part of the upper surface side of the elastic members 7(7a, 7b) faces and is close to or in contact with the lower surface side of the weight 6. In this state, the weight 6 does not displace, and there is no variation in the distance from the face material contact portion 2.

[0065] When the oscillation means 3 receives the transmission of vibration due to noise or the like from this state, the oscillation means 3 starts to vibrate, and as a result, the weight 6 is displaced. Due to this displacement of the weight 6, the distance between the weight 6 and the face material contact portion 2 repeats being long and short.

[0066] Therefore, when the weight 6 is displaced to a state of being separated from the face material contact portion 2, as shown in FIG. 7(b), the lower surface portion of the weight 6 floats from the upper surface portions of the elastic members 7a, 7b and only separates with a gap h1. Since the elastic members 7a, 7b are fixed to the face material contact portion 2 on the lower surface, the state does not change at all due to the separation of the weight 6. Therefore, except for the displacement of the weight 6, neither the weight 6 nor the elastic members 7a, 7b cause any special change.

[0067] When the weight 6 is displaced to a state where it approaches the face material contact portion 2, as shown in FIG. 7(c), the weight 6 contacts the elastic members 7a and 7b, and is displaced so as to compress the elastic members 7a and 7b at the contact portion. A reaction force (restoring force) in the restoring direction due to the deformation (low-rebound elastic deformation) accompanying the compression of the elastic members 7a and 7b acts as a resistance force against the weight 6, suppressing the amplitude of the original weight 6. That is, since the weight 6 is displaced in a state of resisting the elastic force (restoring force) accompanying the deformation of the elastic members 7a and 7b, the amplitude decreases due to the resistance of the elastic force (restoring force), resulting in a small displacement (h2). As a result, the vibration energy is absorbed and attenuated by the elastic members 7a and 7b.

[0068] Of course, the vibration of the weight 6 does not disappear with a single contact (resistance force application) with the elastic members 7a and 7b. Instead, multiple contacts (resistance force applications) are repeated, and the vibration gradually attenuates. Therefore, after the first contact, the weight 6 is displaced again to a state of being separated from the face material contact portion 2 (see FIG. 7(b)), the weight 6 is also separated from the elastic members 7a and 7b, and then, again, contacts the elastic members 7a and 7b and receives the resistance force. By repeating such multiple contacts, the vibration of the weight 6 can be attenuated earlier with fewer vibration cycles than when it attenuates in a normal state.

[0069] <Modification of the First Embodiment> FIG. 8 shows a modification of the first embodiment. In this modification, the weight 6 is provided with an extension portion 67 that is long in the longitudinal direction Y and extends in a direction away from the mounting means 4, and an elastic member 7 is disposed between the extension portion 67 and the face material contact portion 2. Also in this case, the elastic member 7 is fixed only at the face material contact portion 2. As a result, it has a structural intersection point where the elastic member 7 is disposed between the face material contact portion 2 and the weight 6. Therefore, when the weight 6 is displaced, when it approaches the face material contact portion 2, the elastic member 7 is compressed, and a resistance force acts on the weight 6 during the compression.

[0070] In this case, since the elastic member 7 is provided with the weight 6 extending in the length direction in order to avoid contact with the vibrating member 5, it is not necessary to divide and arrange the elastic member 7 on both sides of the vibrating member 5. Although not shown in the figure, instead of extending the weight 6, the upper layer 53 of the vibrating member 5 may be extended in the same manner.

[0071] As another modification, as shown in Fig. 9(a), an elastic member 7c may be arranged between the fixing region (lower layer) 51 and the vibrating region (middle layer) 52 of the vibrating member 5, and as shown in Fig. 9(b), an elastic member 7d may be arranged between two adjacent vibrating regions (middle layer and upper layer) 52, 53.

[0072] These elastic members 7c, 7d are both in a state of being interposed between them when the vibrating member 5 is not vibrating, and their cross-sectional shape is substantially frustum-shaped, and they are fixed to one side on one surface (bottom surface or upper surface). Since only one surface is fixed, like in the first embodiment, it can exhibit a resistance force against displacement when being compressed.

[0073] Since these elastic members 7c, 7d are arranged in a narrow portion, they are relatively thin, but they can be arranged continuously in the width direction X of the vibrating member 5. On the other hand, since the relative amplitude (change in the distance between each other) during vibration is small, those with a large elastic modulus (resistance force) can be used. Also, the two types of elastic members 7c, 7d shown in Figs. 9(a) and (b) may be arranged simultaneously. In this case, the resistance force against displacement can be exerted by both of the two elastic members 7c, 7d.

[0074] Further, these elastic members 7c and 7d may be used in combination with the elastic members 7a and 7b (see FIG. 5) in the above-described first embodiment or the elastic member 7 (see FIG. 8) which is a modified example thereof. When the elastic members 7 (7a to 7d) are made of a low-rebound elastic material, it may take time for the shape to be restored. Therefore, by using a large number of elastic members 7 (7a to 7d), it is expected to exert sufficient resistance while using a low-rebound material.

[0075] <Second Embodiment> Next, a second embodiment of the present invention will be described. FIG. 10(a) shows the basic structure of this embodiment. As shown in FIG. 10(a), in this embodiment, a wide-area elastic member 8 is provided on the back side of the face material 11. The back side of the face material 11 is the ceiling back in the case of a ceiling structure and the wall back in the case of a wall structure. Since there is a space for providing a heat insulating material or the like in a general ceiling back or wall back, the elastic member 8 is installed in this space.

[0076] Here, the elastic member 8 used in this embodiment is also used in combination with glass wool provided on the back surface side of the face material as a heat insulating material, a sound absorbing material, or the like. That is, since the glass wool used for a heat insulating material or the like is also a low-rebound elastic material as a whole, this low-rebound elastic material mainly exhibits a heat insulating effect and is secondarily used as the elastic member 8.

[0077] The glass wool used as a heat insulating material or the like is an aggregate of fine glass fibers and is a cotton-like material formed into a sheet shape. Generally, it is a roll-shaped sheet material having a width dimension of several tens of cm to about 1 m, and the thickness dimension is about several tens of mm. Therefore, in this embodiment, when this glass wool is laid on the back side of the face material 11, it is provided in a state of being in contact with the vibration damping device 1. Specifically, it is arranged so as to be in contact with the surface of the vibration member 5 or the weight 6 constituting the oscillation means 3.

[0078] Since glass wool is a sheet-like flexible material, when laminating it on the back side of the facing material 11, it can be made to contact the back surface side of the facing material 11, and in the part where the facing material support part (such as the edge) 12 exists, it can be laminated so as to straddle it and contact the facing materials 11 on both sides. And in the part where the vibration damping device 1 is mounted on the facing material support part (such as the edge) 12 by the mounting means 4, it can be provided so as to cover the vibration damping device 1. Therefore, in the present embodiment, in the state of the covering, it is arranged in a contact state on the upper surface part of the weight 6.

[0079] Note that in FIG. 10(a), since the upper surface of the weight 6 protrudes more than the facing material 11 from the mounting means 4, if the vibration damping device 1 is covered with the glass wool (elastic member) 8, the weight 6 will inevitably also be covered and can be installed in a state where contact is possible. However, as shown in FIG. 10(b), when the mounting means 4 (facing material support part 12) protrudes more than the upper surface of the weight 6, the glass wool (elastic member) 8 is appropriately deformed so as to intentionally bring the glass wool (elastic member) 8 into contact with the upper surface of the weight 6.

[0080] And these figures illustrate the ceiling space. Since the elastic member (glass wool) 8 has an appropriate weight as a whole, it can maintain the laminated state as described above (as shown in the figure). Further, since the glass wool (elastic member) 8 produces a low-rebound elastic deformation with respect to the compressive deformation in the width direction as a whole in a sheet shape, it functions as an elastic member within the range of its elastic deformation.

[0081] <Operating mode> In the case of the present embodiment, as shown in FIG. 11(a), in the state where the oscillation means 3 is not vibrating, the glass wool (elastic member) 8 is covered in a state of being in contact with the weight 6. And this covering state is maintained. And from this state, when the oscillation means 3 starts to vibrate, the weight 6 will move (be displaced) so as to change the distance from the facing material contact part 2.

[0082] At this time, when the weight 6 moves so as to approach the face material contact portion 2, as shown in FIG. 11(b), the upper surface portion of the weight 6 is in a state of separating from the glass wool (elastic member) 8. However, when the weight moves so as to separate from the face material contact portion 2, as shown in FIG. 11(c), the glass wool (elastic member) 8 is compressed. When the weight 6 simply separates from the glass wool (elastic member) 8, it is largely displaced (displacement width h1), but when the resistance of the glass wool (elastic member) 8 acts, it is slightly displaced (displacement width h2). At this time, the glass wool (elastic member) 8 undergoes low-rebound elastic deformation, and the reaction force (restoring force) in the restoring direction acts as a resistance force against the weight 6. Due to this resistance force, the amplitude of the weight 6 is suppressed, and as a result, the vibration energy is absorbed and attenuated by the glass wool (elastic member) 8.

[0083] And, similar to the first embodiment, the vibration of the weight 6 is repeated a plurality of times. Due to this vibration, the glass wool (elastic member) 8 is compressed a plurality of times, and each time the compression deformation is made, a resistance force acts, so that the vibration can be attenuated early.

[0084] <Modification of the Second Embodiment> Regarding the vibration attenuation structure by the glass wool (elastic member) 8 as described above, the glass wool (elastic member) 8 is provided in a state straddling the vibration damping device 1. In addition, as shown in FIG. 12(a), it may be intermittently covered at both end portions of the sheet-like glass wool (elastic members) 81 and 82 provided adjacent to each other. This is because since the sheet-like glass wool 81 and 82 are rectangular in plan view, in addition to the case where the long side direction is orthogonal to the axis of the face material support portion (such as the edge) 12 (see FIG. 11), it becomes a different state depending on the case where it is provided parallel to the axis on the face material support portion (such as the edge). Even in such an installation state, by partially laminating one glass wool 81 on the upper surface portion of the weight 6, it is possible to act a resistance force against the weight 6.

[0085] Further, as shown in Fig. 12(b), the above-mentioned glass wool (elastic member) 8 may be installed together with the elastic member 7 in the first embodiment. In the case of such a configuration, when the position of the weight 6 changes (displaces) due to the vibration of the oscillation means 3, when it displaces in the direction approaching the face material contact portion 2, the resistance force by the elastic member 7 in the first embodiment acts, and conversely, when it displaces in the direction away from the face material contact portion 2, the elastic member 8 made of glass wool applies a resistance force. Since the weight 6 receives the action of the resistance force in both directions of displacement due to vibration, the attenuation of vibration becomes even faster. Of course, the elastic member 8 used in combination with the elastic member 8 made of glass wool may use a modified example of the first embodiment.

[0086] Furthermore, Fig. 13 shows the state of the back of the wall in the wall structure. The glass wool (elastic member) 9 used for the heat insulating material etc. in the back of the wall is in a state of being sandwiched between the outer wall A and the face material 11, and in the portion where the face material support portion (base rail etc.) 12 exists, the glass wool (elastic member) 9 is provided in a state of being elastically deformed. Therefore, when the vibration damping device 1 is provided on this face material support portion (base rail etc.) 12 as well, the glass wool (elastic member) 9 is provided in a state of being elastically deformed. Therefore, since the glass wool (elastic member) 9 can be arranged in a state of contacting the weight 6, similarly to the above, when the oscillation means 3 vibrates, a resistance force can be applied to attenuate the vibration of the weight 6.

[0087] <Other Modification Examples> The embodiments of the building sound absorption structure according to the present invention are as described above, but these embodiments show an example of the present invention, and the present invention is not limited to these embodiments. Therefore, other components can be added to the configuration of the present invention, or the components can be changed. For example, in the oscillation means 4 of the vibration damping device 1 in the above embodiment, as the vibration member 5, a configuration in which a plate-shaped member is bent in an S shape is exemplified, but it is also possible to use a vibration damping device 1 in which the vibration member 5 has another shape.

[0088] Even when the vibration member 5 is configured in other shapes, basically, since the weight 6 is installed on the upper surface of the upper layer 53 of the vibration member 5, if extension portions 65, 66, 67 are formed on the weight 6, it is possible to adopt the first embodiment (or a modified example). Also, it is possible to adopt a configuration in which the glass wool (elastic member) 8 according to the second embodiment is provided.

[0089] By the way, when the vibration member 5 is U-shaped, the vibration member 5 is composed of a fixed region (lower layer) 51 and one vibration region (upper layer) 53. Therefore, as shown in FIG. 14(a), an elastic member 7 can be provided between the fixed region 51 and the vibration region 53. Also, as shown in FIG. 14(b), when the vibration member 5 is M-shaped, since there are a plurality of vibration regions above the fixed region 51, elastic members 71, 72, 73 may be installed in the respective gaps.

[0090] Furthermore, in addition to these configurations, an elastic member 7 (first embodiment) may be provided between the face material contact portion 2 and the weight 6, or the glass wool (elastic member) 8 may be coated. That is, a configuration in which a plurality of forms are appropriately combined may be adopted.

[0091] Note that the vibration damping device 1 used in the present invention is configured to be able to handle various vibration frequencies as described above. Also, since the weight 6 integrates a plurality of weight components 60a to 60d in a laminated state for weight adjustment, it can oscillate at different natural frequencies by increasing or decreasing the number of these weight components 60a to 60d. Therefore, according to each adjusted natural frequency, the elastic characteristics of the elastic members 7, 7a, 7b, 71, 72, 73, 8, 9 used can be changed.

[0092] That is, when corresponding to a low vibration frequency (low frequency), in order to increase the weight of the weight 6, the vibration energy during displacement increases, so an elastic characteristic that increases the repulsive force (increases the resistance force) by applying a resistance force to this is adopted. Conversely, when corresponding to a high vibration frequency (high frequency), an elastic characteristic that decreases the repulsive force (decreases the resistance force) is adopted. Such a change in elastic characteristics can be easily manipulated by adjusting the foaming ratio in the case of low-rebound urethane foam or the like, and by adjusting the density of glass fibers in the case of glass wool. Note that there is no necessity to change the elastic characteristics according to the vibration frequency. As long as a resistance force can be applied to the oscillation means 3 (especially the weight 6), it is obvious that it contributes to the absorption of vibration energy.

Explanation of Signs

[0093] 1 Vibration damping device 2 Face material contact part 3, 103, 203 Oscillation means 4 Mounting means 5, 105, 205 Vibration member 6, 6a, 6b Weight 7 Elastic member 11 Face material (ceiling material, etc.) 12 Face material support part (edge, etc.) 13 Suspension bolt 14 Hanger 15 Edge receiver 16 Connecting fitting (clip, etc.) 20a Fixed area 20b Non-fixed area 21 Extension base edge of the face material contact part 22 Scheduled fixing area 41, 42 Mounting member (mounting member for the lower surface) 43 Mounting member (mounting member for the upper surface) 44, 45, 46 Locking part 47 Rising base 48 Lower edge part of the rising base 49 Screw 51, 151, 251 Lower layer of the vibration member (fixing area) 52, 252a, 252b Middle layer of the vibration member Upper layer of the vibrating member 53,153,253 Curved portions 54,55,154,254a,254b,255 Elongated holes 56,57 Weight components 60a,60b,60c,60d Through holes 61,62 Rivets 63,64 Elastic members 7,7a,7b,7c,7d,71,72,73 Glass wool (elastic member) 8,9 Outer wall A

Claims

1. A sound-absorbing structure that attaches a vibration damping device to a facing material support portion that supports a facing material used in a building structure and reduces the vibration of the facing material caused by living noise, The vibration damping device includes a mounting means that can be mounted on the facing material support portion, a facing material contact portion that is supported by the mounting means and can contact the facing material, and an oscillation means that is installed on the facing material contact portion and oscillates in response to the transmission of vibration. The oscillation means includes a fixed region that is fixed to the facing material contact portion, a vibration region that is formed in a vibration-free state with a predetermined interval from the facing material contact portion while being continuous with this fixed region, and a weight that is detachably provided in this vibration region. A building sound-absorbing structure characterized in that when the vibration region or the weight is displaced by vibration, a resistance member that acts as a resistance to displacement in at least one direction is provided so as to be able to contact either one or both of the vibration region or the weight.

2. The resistance member is an elastic member that is arranged in any one or more of the following positions: between the facing material contact portion or the fixed region and the vibration region, between adjacent vibration regions, or between the facing material contact portion and the weight. The elastic member acts as a resistance to the displacement when the vibration region or the weight is displaced in a direction approaching the fixed region or the facing material contact portion. The building sound-absorbing structure according to Claim 1.

3. The resistance member is glass wool that is arranged on the back side of the facing material and has appropriate elasticity as a whole. It is arranged instead of or together with the elastic member so that the glass wool can contact either one or both of the vibration region or the weight. The glass wool acts as a resistance to the displacement when the vibration region moves away from the fixed region or the weight moves away from the facing material contact portion. The building sound-absorbing structure according to Claim 2.

4. The building sound-absorbing structure according to Claim 2 or 3, wherein the resistance member is selectively provided with different elastic characteristics for each vibration damping device mounted on the facing material support portion.

5. The resistance member is selectively provided with different elastic characteristics for each facing material, and the elastic characteristics are selectively used from at least four types. The building sound-absorbing structure according to Claim 2 or 3.

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