JP4971065B2 - Damping device for building structure - Google Patents

Description

  The present invention relates to a vibration control device for a building structure that is preferably employed to suppress vibrations of a plate-like or beam-like building structure made of a material having almost no damping property.

  Conventionally, for example, a structure made of a material having almost no damping property such as wood, FRP, glass, and steel plate takes a long time until the vibration is settled once the vibration is started. Various vibration control devices are attached to suppress vibration. For example, Patent Literature 1 and Patent Literature 2 disclose leaf spring type dynamic vibration absorbers used for suppressing vibrations of structures such as bridges and houses. This leaf spring type dynamic vibration absorber is used by attaching a weight to one end portion of the leaf spring and fixing the other end portion of the leaf spring to a structure to be controlled.

  In the leaf spring type dynamic vibration absorber of Patent Document 1, two or more leaf springs arranged in parallel with a gap are used, and two adjacent leaf springs are viscoelastic or viscous. The leaf spring is given a damping property by being fixed via a damper. On the other hand, in the leaf spring type dynamic vibration absorber disclosed in Patent Document 2 or the leaf spring type dynamic damper disclosed in Patent Document 3, a high damping rubber material (damping material) and a restraint plate (restraint material) are laminated on the leaf spring. By fixing in a state, the leaf spring has a damping property. These leaf spring type dynamic vibration absorbers (dynamic dampers) of Patent Documents 1 to 3 are advantageous in that they have a simple structure, can be reduced in size and weight, and can be easily attached to a structure. .

  Further, as another vibration damping device, as disclosed in Patent Document 4, a mass member that is opposed to a fixed member attached to a vibration damping object with a predetermined distance is elastically formed by a rubber elastic body. There is known a liquid filled dynamic damper in which a liquid is sealed in a liquid chamber formed between a fixed member and a mass member by a rubber elastic body that is attached to be supported. Further, Patent Document 5 discloses that an entire structure such as an in-vehicle disk player is supported by vibration-proof rubber or a viscous fluid-filled damper.

  By the way, in the leaf spring type dynamic vibration absorber of Patent Document 1, since two adjacent leaf springs are fixed via a viscoelastic body or a viscous body damper, they are provided at one end of each leaf spring. The movement of the weights oscillates in the same phase, but the other leaf spring is displaced with respect to one leaf spring, which makes it difficult to displace, and shear displacement occurs in the viscoelastic body or viscous material damper due to some displacement. Even if it occurs, the resulting attenuation effect is not as promising. Therefore, it becomes difficult to quickly converge the vibration of the structure to be controlled.

On the other hand, when the high damping rubber material (damping material) and the restraint plate (restraint material) are fixed to the leaf spring in a laminated state like the leaf spring type dynamic vibration absorber (dynamic damper) of Patent Documents 2 and 3 above. In order to secure sufficient damping of the leaf spring, a large amount of high damping rubber material (damping material) and restraining plate (restraining material) are required. Therefore, the weight tends to increase remarkably, which is disadvantageous in terms of weight reduction. In addition, in the case of the liquid-filled dynamic damper of Patent Document 4, in order to obtain a sufficient damping effect, the ratio of the mass of the mass member to the total weight of the structure to be damped is set. It is necessary to make it larger than a leaf spring type dynamic vibration absorber (dynamic damper).
JP 59-110938 A JP-A-2005-351366 JP 2004-28124 A JP-A-5-87184 Japanese Utility Model Publication No. 5-62753

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is a problem to be solved to provide a vibration damping device for a building structure that can be more advantageously reduced in weight and can converge vibrations at an early stage. It is what.

The vibration damping device for a building structure according to the present invention that solves the above problems is formed of a rigid plate material having a predetermined mass and is composed of any one of a floor, joist, pillar, beam, wall, and ceiling. A leaf spring member in which a predetermined support portion is supported and fixed so that one end or both ends can vibrate in the same direction as the main vibration direction of the building structure,
At the time of vibration input, a vibration end portion of the leaf spring member (meaning one end portion or both end portions of the leaf spring member) or a leaf spring side attachment member integrally attached to the vibration end portion is the building structure or A building structure damping device that suppresses vibration of the building structure by colliding with a structure-side mounting member that is integrally attached to the building structure,
The vibration end of the leaf spring member or the leaf spring side mounting member is disposed in contact with the building structure or the structure side mounting member when the building structure is not vibrating,
A portion of the vibration control device for the building structure that vibrates with respect to the building structure is tuned to have a natural frequency smaller than a natural frequency of the building structure that is a vibration suppression target due to the collision. It is characterized by being.

  In the vibration damping device for a building structure according to the present invention, when vibration is input to the building structure to which the vibration damping device is attached, the vibration end of the leaf spring member is supported by the building structure of the leaf spring member. It vibrates in the same direction as the vibration direction of the building structure using the fixed support part as a fulcrum.

  In the present invention, the portion of the building structure damping device that vibrates with respect to the building structure is tuned to have a natural frequency smaller than the natural frequency of the building structure that is the object of vibration suppression due to the collision. Has been. Here, the frequency characteristics of a part that vibrates with respect to the building structure (hereinafter referred to as “vibration part of the building structure vibration device”) of the vibration damping device for the building structure has a phase difference in the vicinity of the natural frequency. The phase difference at a frequency larger than the natural frequency changes to approach 180 °, and conversely, the phase difference at a frequency smaller than the natural frequency changes to approach 0 °. Therefore, by tuning the natural frequency as described above, the phase difference between the building structure and the part that vibrates with respect to the building structure in the damping device for the building structure is closer to 180 ° than 90 °. It becomes a phase difference. As a preferable range of the natural frequency of the vibration part of the vibration control device of the building structure, a range in which the natural frequency of the building structure that is the object of vibration suppression by the collision is 1/3 times or more and less than 1 time. It is.

  In this way, when vibration is input to the building structure, the vibration portion of the vibration control device for the building structure and the building structure are relatively displaced by vibrating at a phase close to an opposite phase. Accordingly, the vibration end portion of the leaf spring member or the leaf spring side mounting member and the building structure or the structure side mounting member operate so as to repeat the collision. This collision effectively absorbs the vibration energy of the building structure. In addition to the collision, the present invention can also function as a dynamic damper, so that it exhibits a damping effect as a dynamic damper. Therefore, in addition to the effect due to the collision, the vibration input to the building structure converges at an early stage and the vibration peak value is reduced due to the effect as a dynamic damper. In the vibration damping device for a building structure according to the present invention, the mass of the mass member necessary for exhibiting the same vibration damping effect can be reduced as compared with the dynamic damper. That is, according to the present invention, the weight can be reduced.

  Further, according to the present invention, the vibration end of the leaf spring member or the leaf spring side mounting member is disposed in contact with the building structure or the structure side mounting member when the building structure is not vibrating. ing. Here, the state in which the vibration end portion of the leaf spring member or the leaf spring side mounting member is in contact with the building structure or the structure side mounting member refers to the state of the leaf spring member with respect to the building structure or the structure side mounting member. Not only when contacting the vibration end or leaf spring side mounting member without any pressing force (zero touch), but also with the pressing force that does not interfere with vibration input. It is also included. Therefore, even if the amplitude of the vibration part of the vibration damping device of the building structure is reduced, the vibration end portion of the leaf spring member or the leaf spring side mounting member and the building structure or the structure side mounting member are securely connected. It can be made to collide. That is, even if the vibration of the building structure is minute, the effect of suppressing the vibration can be exhibited.

  By the way, when the natural frequency of the vibration part of the vibration control device of the building structure is substantially the same as the natural frequency of the building structure that is the object of vibration suppression due to the collision, the phase difference between the two is around 90 °. However, the amplitude of the vibration part of the vibration control device for the building structure increases. On the other hand, when the natural frequency of the vibration part of the vibration control device of the building structure is sufficiently larger than the natural frequency of the building structure that is the object of vibration suppression due to the collision, the phase difference between them approaches 180 °. However, the amplitude of the vibration part of the vibration control device for the building structure is reduced. Accordingly, the smaller the natural frequency of the vibration part of the vibration damping device of the building structure is, the closer the phase difference is to 180 °, but the vibration end of the leaf spring member or the leaf spring side mounting member and the building structure or The collision force with the structure-side mounting member is reduced. Therefore, in consideration of the phase difference and the amplitude, it is necessary to appropriately tune the natural frequency of the vibration part of the vibration damping device for a building structure.

  In addition, the natural frequency (fn) of the vibration damping device of the building structure depends on the length (L), thickness (t), density (ρ), Young's modulus (E), and coefficient (λ) of the leaf spring member. Based on the following formula 1, it is obtained. Here, when there is no mass member, λ = 1.875.

  As a preferred aspect of the present invention, at least one of the leaf spring side mounting member and the structure side mounting member is made of an elastic body. Thereby, the early convergence effect of the vibration of a building structure and the reduction effect of a vibration peak value improve. Furthermore, the collision sound between the elastic body and the mating member can be reduced. This elastic body includes a rubber elastic body only, a liquid-filled damper, and a thermoplastic elastomer. When the liquid-filled damper is applied, the vibration suppressing effect due to the flow of the sealed liquid is exhibited.

  When the leaf spring side mounting member is an elastic body, the contact state between the leaf spring side mounting member and the building structure or the structure side mounting member is a state in which a pressing force is applied so as not to interfere with vibration input. Is easy. In addition, when the structure-side mounting member is an elastic body, the contact state between the structure-side mounting member and the vibration end of the leaf spring member or the leaf spring side mounting member is similarly affected when a vibration is input to the elastic body. It is easy to obtain a state where a pressing force of a certain level is applied. In particular, in a state in which the pressing force is applied to the elastic body in advance, the vibration suppressing force can be further increased, so that the effect of early convergence of vibration and the effect of reducing the vibration peak value are improved.

  As a preferred aspect of the present invention, a mass member (weight) is further provided on the vibration end side of the leaf spring member. In this way, it is possible to easily tune the natural frequency of the vibration part of the vibration damping device for a building structure. Furthermore, when the vibration is input, the pressing force against the building structure side by the vibration part of the vibration control device of the building structure increases, so that the collision force can be increased. That is, the vibration end of the leaf spring member or the leaf spring side mounting member and the building structure or structure side mounting member while the phase difference between the vibration part of the vibration damping device of the building structure and the building structure is brought close to 180 ° It is possible to increase the collision force.

  In the case where a mass member is installed, when the direction connecting the support portion fixed to the building structure and the vibration end portion of the leaf spring member is defined as the longitudinal direction, The base end of the mass member is attached to the vibration end of the leaf spring member such that the length of the mass member is in the longitudinal direction of the leaf spring member. It is good to be formed longer than this length.

  The mass member can easily secure a sufficient plate thickness as compared with the leaf spring member. Therefore, it becomes easy to ensure a sufficient mass while making the overall shape of the vibration damping device for a building structure long. Moreover, the leaf | plate spring member is formed, for example with the steel plate, and the mass member is formed in the block shape, for example with the iron-type metal. Therefore, in general, the leaf spring member has a lower rigidity than the mass member. Therefore, if the length of the leaf spring member in the longitudinal direction is increased, it is difficult to ensure rigidity accordingly. However, sufficient rigidity can be ensured by making the length of the longitudinal direction of the leaf spring member shorter than the length of the mass member in the longitudinal direction. Further, when the mass of the mass member is the same, the longer shape in the longitudinal direction has a longer separation distance between the support portion of the leaf spring member and the distal end portion of the mass member, and therefore the amplitude force at the distal end portion of the mass member. Increases and the impact force increases.

  Further, when the mass member is installed, the leaf spring side mounting member is made of an elastic body and is inserted into the outer peripheral surface of the mass member by press-fitting, and an elastic body integrally formed with the cylindrical portion. And a collision part that collides with the building structure or the structure-side mounting member. As described above, the leaf spring member is made of, for example, a steel plate, and the mass member is made of, for example, a ferrous metal in a block shape. In other words, the mass member has a greater thickness in the plate thickness direction than the leaf spring member. Therefore, by inserting and attaching the cylindrical part of the leaf spring side mounting member to the outer peripheral surface of the mass member by press-fitting, it is possible to secure a sufficient contact area between the two, thereby securing a sufficient press-fitting allowance. That is, it becomes easy to attach the leaf spring side attachment member to the mass member, and it is possible to prevent the leaf spring side attachment member from being detached from the mass member after being attached.

  As a preferred aspect of the present invention, the structure-side mounting member is fixed to the leaf spring member, and the vibration end portion of the leaf spring member or the leaf spring-side mounting member collides with the structure-side mounting member at the time of vibration input. . In this case, the vibration end portion of the leaf spring member or the leaf spring side attachment member collides with the structure side attachment member fixed to the leaf spring member. If the vibration end of the leaf spring member or the leaf spring side mounting member collides with the building structure itself, the portion of the building structure where the vibration end of the leaf spring member or the leaf spring side mounting member collides The collision force varies depending on the shape. On the other hand, when the vibration end of the leaf spring member or the leaf spring side mounting member collides with the structure side mounting member, the collision force varies depending on the shape of the structure side mounting member. Unaffected by shape. And the shape of a structure side attachment member can be set freely. Therefore, according to this aspect, the collision force can be adjusted without being affected by the shape of the building structure. In other words, it is possible to reliably adjust the collision force before attaching the vibration control device for the building structure to the building structure.

  In addition, when the vibration damping device for a building structure according to the present invention is a device intended to suppress floor vibration, any of the following configurations may be employed.

  First, the vibration damping device for a building structure according to the present invention is a device that suppresses vibration of the floor, and the leaf spring member is supported and fixed inside a hollow joist attached under the floor. Since the joist is a building structure that supports the floor, a reliable damping effect can be achieved by attaching a vibration control device to the joist. When the joist is hollow, the damping device can be easily prevented from falling off by disposing the damping device therein. However, in order to attach inside a hollow joist, attachment may be difficult depending on the length of joist.

  Secondly, the vibration control device for a building structure according to the present invention is a device that suppresses vibration of the floor, and the leaf spring member is supported and fixed to the outer peripheral surface of the joist attached under the floor. In this case, it becomes very easy to attach the vibration damping device.

  Thirdly, the vibration control device for a building structure according to the present invention is a device that suppresses vibration of the floor, and the building includes a joist attached under the floor and an underfloor plate material attached to the lower surface of the joist. The leaf spring member is supported and fixed to an adjacent portion of the joist among the underfloor plate materials. When it is difficult to attach to the joist, it is possible to exert a sufficient effect by attaching it to the adjacent part of the joist in the underfloor board.

  Fourthly, the vibration damping device for a building structure according to the present invention is a device for suppressing floor vibration, wherein the leaf spring member is supported and fixed to the lower surface of the floor, and the structure side mounting member is a leaf spring member. The vibration end portion or the leaf spring side mounting member collides with the upper surface thereof. Thus, when the vibration damping device can be directly attached to the floor, the floor vibration damping effect can be surely exhibited. Even when the leaf spring member is supported and fixed to the lower surface of the floor, the vibration end portion of the leaf spring member or the position where the leaf spring side mounting member and the structure side mounting member collide with each other is always the leaf spring. It is below the vibration end of the member or the leaf spring side mounting member. Originally, the vibration end of the leaf spring member bends downward due to gravity, centering on the support portion of the leaf spring member. In other words, by adopting the configuration as described above, the vibration end portion of the leaf spring member or the leaf spring side mounting member and the structure side mounting member are in contact with each other in a state where the floor as a building structure is not vibrating. It becomes easy to do.

  Fifth, the vibration damping device for a building structure according to the present invention is a device that suppresses vibration of the floor, and the leaf spring member is supported and fixed to the lower surface of the floor, and the vibration end portion or leaf spring of the leaf spring member. The upper side of the side mounting member collides with the building structure or the structure side mounting member. However, in this case, when the floor, which is a building structure, is not vibrating, the vibration end of the leaf spring member or the leaf spring side mounting member is attached so as to contact the lower surface of the floor or the structure side mounting member. In addition, it is necessary to consider that the vibration end portion of the leaf spring member bends downward due to gravity.

  Next, the support structure of a leaf | plate spring member is demonstrated. The following two types of configurations are possible. The first configuration is a configuration in which the base end of the leaf spring member is supported and fixed to the building structure, and the one end portion of the leaf spring member can be vibrated. That is, it becomes the structure of a cantilever support. The second configuration is a configuration in which the central portion of the leaf spring member is supported and fixed to the building structure, and both end portions of the leaf spring member can be vibrated. Also in this case, it becomes the structure of a cantilever support and it is installed in the both sides of the support part. In this case, the natural frequency of the vibration part on one side of the support part can be made different from the natural frequency of the vibration part on the other side from the support part. Thereby, the suppression effect can be exhibited with respect to two different types of vibration.

  The building structure damping device of the present invention is formed of a rigid plate material having a predetermined mass, and can vibrate at one end or both ends in the same direction as the main vibration direction of the building structure with respect to the building structure. A leaf spring side mounting member that is provided with a leaf spring member that is supported and fixed at a predetermined one support portion and is integrally attached to the vibration end portion of the leaf spring member or the vibration end portion at the time of vibration input. Is a building structure damping device that suppresses vibration of the building structure by colliding with the building structure or a structure-side mounting member integrally attached to the building structure, The weight can be advantageously reduced, and the vibration of the building structure can be converged at an early stage.

  In particular, the vibration end of the leaf spring member or the leaf spring side mounting member is disposed in contact with the building structure or the structure side mounting member when the building structure is not vibrating, and controls the building structure. The part of the vibration device that vibrates with respect to the building structure is tuned to have a natural frequency that is smaller than the natural frequency of the building structure that is subject to vibration suppression due to a collision. Is input, the vibration part of the vibration control device of the building structure and the building structure are relatively displaced by vibrating at a phase close to an opposite phase. Accordingly, the vibration end portion of the leaf spring member or the leaf spring side mounting member and the building structure or the structure side mounting member operate so as to repeat the collision. Since the vibration energy of the building structure is effectively absorbed by this collision, the vibration input to the building structure converges early and the vibration peak value is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In particular, the vibration damping device for a building structure according to the present invention is applied to one that suppresses vibration of a floor of a building in order to exhibit good sound insulation performance of heavy floor impact sound.

Embodiment 1
FIG. 1 is a front view of a state in which the building structure damping device according to the present embodiment is attached to the building structure. As shown in FIG. 1, the vibration damping device for a building structure according to this embodiment includes a leaf spring member 101, a support member 102, a collision rubber elastic body 103, and a mass member 104.

The leaf spring member 101 is formed of a steel plate having a predetermined mass in a long shape (a rectangle whose longitudinal direction is the left-right direction in FIG. 1), and is a support member fixed to a predetermined position on the upper surface of the building structure 105 that vibrates. The base end portion (support portion) is supported and fixed to 102. That is, the leaf spring member 101 is cantilevered by the support member 102 and vibrates at a predetermined distance from the building structure 105 whose tip portion (corresponding to the “vibration end portion” in the present invention) vibrates. It is arranged in a state of being substantially parallel to the building structure 105. Thereby, the front-end | tip part of the leaf | plate spring member 101 can vibrate freely to the same direction as the main vibration direction (up-down direction in FIG. 1) of the building structure 105. FIG. The Young's modulus of the leaf spring member 101 is 1.86 × 10 ¹¹ N / m ² .

  The impact rubber elastic body 103 has a trapezoidal pyramid shape in which the tip of the conical tip is cut. The large-diameter surface is fixed to the lower surface side of the distal end portion of the leaf spring member 101 so that the small-diameter surface of the collision rubber elastic body 103 faces downward. The small-diameter side end of the collision rubber elastic body 103 is arranged in contact with the upper surface of the building structure 105 when the building structure 105 is not vibrating. When the building structure 105 is not oscillating, the collision rubber elastic body 103 may be brought into contact with the upper surface of the building structure 105 in a zero-touch state or in a slightly pressed state. May be.

  The impact rubber elastic body 103 is not fixed to the building structure 105 and can be separated from the building structure 105. That is, the collision rubber elastic body 103 repeatedly collides with the building structure 105 by being separated from the building structure 105 or pressing the building structure 105 when vibration is input from the building structure 105. As the material of the impact rubber elastic body 103, for example, a material mainly composed of butyl rubber (II-R) is used.

  The mass member 104 is formed in a block shape so as to have a predetermined mass using an iron-based metal. The mass member 104 is fixed to the upper surface of the distal end portion of the leaf spring member 101. That is, the collision rubber elastic body 103 is positioned below the mass member 104. In the present embodiment, the mass of the mass member 104 is 2.5 kg.

  That is, the site | part (henceforth "vibration site | part") which vibrates with respect to the building structure 105 among the damping devices of the building structure of this embodiment is the leaf | plate spring member 101, the rubber elastic body 103 for collision, The mass member 104 is obtained.

  As described above, in the vibration control device for a building structure according to the present embodiment, the vibration part of the vibration control device for the building structure has an eigenfrequency smaller than the natural frequency of the building structure 105 that is a vibration suppression target due to a collision. It is tuned to have a frequency. Here, the frequency characteristic in the vibration part of the vibration damping device of the building structure changes so that the phase difference in the vicinity of the natural frequency becomes 90 °, and the phase difference in the frequency larger than the natural frequency approaches 180 °, Conversely, the phase difference at a frequency smaller than the natural frequency changes so as to approach 0 °. Therefore, by tuning the natural frequency of the vibration part in the vibration control device for the building structure as described above, the phase difference between the vibration part and the building structure 105 in the vibration control device for the building structure is 90. The phase difference is closer to 180 ° than °.

  In this way, when vibration is input to the building structure 105, the vibration part of the vibration control device for the building structure and the building structure 105 vibrate at a phase close to an opposite phase (180 °). Displace. Therefore, the collision rubber elastic body 103 and the building structure 105 operate so as to repeat the collision reliably. Due to this collision, the vibration energy of the building structure 105 is effectively absorbed, so that the vibration input to the building structure 105 converges early and the vibration peak value is reduced. Further, in addition to the vibration damping effect due to the collision, it can also function as a dynamic damper, so that the vibration damping effect as a dynamic damper is exhibited. In this case, the building structure vibration damping device of the present embodiment can be reduced in weight as compared with a simple dynamic damper that does not collide.

[Test 1]
A test was conducted in order to confirm the damping effect of the vibration damping device for a building structure according to the first embodiment. This test was performed based on JIS / A1418-2 “Measurement method of floor impact sound insulation performance of buildings / Part 2: Method using standard weight impact source”. In particular, a plurality of vibration damping devices for building structures according to the present embodiment (test examples (A), (B), (C), (D), and (E)) were attached to the floor board 110 of the building. For comparison, the same test was performed for a case where no vibration damping device was attached (Base) and a case where a dynamic damper disclosed in JP-A-2006-322237 was installed (Comparative Example).

  The leaf spring type vibration damping device used in this test presses the impact rubber elastic body 103 against the vibrating member 105 (in a state where a pressing force is applied), and the pressing amount (compression amount) at that time is 1 mm. . In this test, as shown in FIG. 2, the building structure vibration damping device D or dynamic damper of the present embodiment was distributed on the floor plate 110 over the entire upper floor of the object. That is, as shown in FIG. 2, a plurality of floor boards 110 (10 in FIG. 2) are arranged in parallel so as to be spread over an area surrounded by beams 111 assembled in a rectangular frame shape. Then, as shown in FIG. 2, two building structure damping devices D or dynamic dampers are fixed to each floor board 110. In addition, in FIG. 2, the fixed location, such as the damping device D of a building structure, is illustrated as 20 locations. Then, an impact is applied to each of the center point on the entire floor plane and a plurality of surrounding points (a total of 5 points in FIG. 2) of the floor upper surface indicated by the broken circle in FIG. The sound pressure level was measured at multiple points in the lower floor room.

  The test conditions and test results are shown in FIGS. FIG. 3 shows the test conditions for the mass of the mass member 104, the natural frequency of the vibration part of the building structure damping device or the dynamic damper, the number of these installations, the total mass of the mass member 104 to be installed, and the floor mass. The ratio (mass ratio with respect to floor) of the total mass of the mass member 104 is shown, and the grade value (L value) as a test result and the impact sound reduction value compared with the case where no vibration damping device is attached are shown.

  As shown in FIG. 3, the natural frequency of the vibration part of the vibration damping device for the building structure in the test examples (A) to (E) is set to 53 Hz. This is intended to reduce the vibration of the floor plate 110 near 60 Hz by collision and to reduce the vibration of the floor plate 110 near 50 to 55 Hz by functioning as a dynamic damper. In other words, in this test, the natural frequency of the floor board 110 that is the object of vibration suppression by collision is 60 Hz, and the natural frequency of the floor board 110 that is the object of vibration suppression by functioning as a dynamic damper is 50 to 55 Hz. In addition, 20 multi-type dynamic dampers as comparative examples are arranged having two natural frequencies of 50 Hz and 60 Hz. The mass of the mass member of this multi-type dynamic damper is 7.5 kg. FIG. 4 shows impact sound reduction values with respect to floor mass ratio for five types of test examples and comparative examples.

  As shown in FIGS. 3 and 4, all of the test examples (A) to (E) had an impact sound reduction value of 4 to 7 [dB] compared to the case where no vibration damping device was attached. And the impact noise reduction effect became large, so that the mass ratio to floor became large. The dynamic damper as a comparative example has an impact sound reduction value of 5.8 [dB]. Here, the test example that can obtain the impact sound reduction value equivalent to the comparative example is (C). Comparing the mass ratio of the two to the floor, the mass ratio to the floor in the comparative example is 22.5%, whereas the mass ratio to the floor of the test example (C) is 10.5%. In other words, according to the vibration damping device for a building structure of the present embodiment, it is sufficient that the mass ratio to the floor is about half or less in order to exert the impact sound reduction effect equivalent to the dynamic damper as a comparative example. It is.

  FIG. 5 shows the impact sound level with respect to the octave band center frequency for the test example (C), the comparative example, and the case where the damping device is not attached (Base). In FIG. 5, the grade value (L value) is also displayed. As shown in FIG. 5, in the present embodiment, the impact sound level is reduced even in a frequency band other than 63 Hz. And although it has a slightly inferior band compared with the dynamic damper which is a comparative example, it can be said that the impact sound reduction effect is fully exhibited. As described above, according to the vibration damping device for a building structure of the present embodiment, it is possible to obtain an impact sound reduction effect while reducing the weight.

  In addition to the test based on the JIS standard, floor vibration was measured when an impact was applied to the floor. Specifically, when an impact was applied to each of a plurality of locations on the floor using a specified standard weight impact source, vibrations generated at the plurality of locations on the floor upper surface were measured by an acceleration sensor.

  The result is shown in FIG. FIG. 6 shows one of the measurement results. In FIG. 6, a thick line indicates a case where a vibration damping device is not attached, and a thin line indicates a case where the building structure vibration damping device of the present embodiment is attached. As is clear from FIG. 6, by attaching the building structure damping device of the present embodiment, the peak value of the vibration can be reduced and the vibration can be converged at an early stage. That is, the generated impact sound can be reduced and the generated impact sound can be reduced early. In the above description, the sound insulation performance is exhibited. However, the present invention is not limited to this. For example, a structure that reduces vibrations such as a floor itself can be used.

[Embodiment 2]
Fig.7 (a) is a left view of the state attached to the joist which is the building structure which vibrates the damping device of the building structure which concerns on this embodiment, FIG.7 (b) is the building which concerns on this embodiment It is a front view of the state attached to joist which is a building structure which vibrates the damping device of a structure. As shown in FIGS. 7 (a) and 7 (b), the building structure vibration damping device of the present embodiment is configured in a box shape in which two side surfaces are opened by plate-like members as the building structure 105 that vibrates. It is attached to the hollow joist that is housed inside, and is composed of a plate member 121, a mass member 124, and a collision rubber elastic body 123.

  The plate member 121 is formed by bending a steel plate, and has a configuration in which the fixing member 121a and the leaf spring member 121b are integrated. The fixing member 121a is formed in a long flat plate shape, two through holes are formed, and a nut is welded to one surface thereof. The fixing member 121a (corresponding to the “structure-side mounting member” of the present invention) is disposed on the upper surface of the joist which is the building structure 105 that vibrates, and is inserted from the outer lower surface of the joist which is the building structure 105. Are integrally attached to the joist which is the building structure 105.

  The leaf spring member 121b has an L shape, and one end thereof is coupled to the end portion of the fixing member 121a. Specifically, the plate spring member 121b has one surface standing from the end of the fixing member 121a and the other surface facing the fixing member 121a in parallel. And the length of the other surface (the left-right direction of FIG.7 (b)) which opposes the fixing member 121a among the leaf | plate spring members 121b is about 1/4 of the length of the longitudinal direction of the fixing member 121a. Is formed. That is, the plate member 121 has a U-shaped shape with different lengths of opposite sides.

  Accordingly, the leaf spring member 121b has a front end portion (corresponding to the “vibration end portion” in the present invention) on the opposite side of the fixing member 121a with the coupling portion with the fixing member 121a as a support point as shown in FIG. It can vibrate up and down. Note that the main vibration direction of the joist which is the building structure 105 is the vertical direction of FIGS. 7A and 7B, so that the tip portion is in the same direction as the main vibration direction of the joist which is the building structure 105. It is supported and fixed to the joist which is the building structure 105 through the fixing member 121a so that it can vibrate.

  The mass member 124 is formed in a rectangular block shape so as to have a predetermined mass by an iron-based metal. The base end portion of the mass member 124 is fixed to the distal end portion of the leaf spring member 121b so that the distal end portion thereof is located on the opposite side of the proximal end portion with respect to the distal end portion of the leaf spring member 121b. The longitudinal direction of the mass member 124 is set to be a direction connecting the support portion of the leaf spring member 121b to the tip portion. The length of the mass member 124 in the longitudinal direction, that is, the length from the proximal end portion to the distal end portion of the mass member 124 is the longitudinal length of the leaf spring member 121b, that is, the support portion of the leaf spring member 121b. Longer than the length of.

  The collision rubber elastic body 123 includes a bottomed cylindrical portion 123a and a collision portion 123b. The bottomed cylindrical portion 123a has a rectangular recess, and is inserted into the outer peripheral surface of the front end portion of the mass member 124 by press-fitting. The collision part 123b consists of an elastic body integrally molded with the bottomed cylindrical part 123a. Specifically, the collision part 123b has a trapezoidal cone shape with the conical tip sharpened side cut, and has a large-diameter surface so that the small-diameter surface of the collision part 123b faces downward. It is made to adhere to the outer surface of the bottom cylindrical part 123a. And the small diameter side end of the collision part 123b is arranged in the state which contacted the upper surface of the fixing member 121a, when the joist which is the building structure 105 is not vibrating. When the joist which is the building structure 105 is not vibrating, the collision part 123b may be brought into contact with the upper surface of the fixing member 121a in a zero-touch state, or in a state of being slightly pressed. Also good.

  That is, the site | part (henceforth "vibration site | part") which vibrates with respect to the joist which is the building structure 105 among the damping devices of the building structure of this embodiment is the leaf | plate spring member 121b, the mass member 124, The rubber elastic body 123 for collision is used. And the natural frequency of these vibration parts is tuned so that it may become smaller than the natural frequency of the joist which is the building structure 105 like the said Embodiment 1. FIG.

  As described above, in the leaf spring damping device of the present embodiment, the longitudinal length of the leaf spring member 121b is shortened. Here, the leaf spring member 121b is less rigid than the mass member 124. Therefore, when the longitudinal length of the leaf spring member 121b is increased, it is difficult to ensure rigidity accordingly. However, sufficient rigidity can be secured by making the longitudinal length of the leaf spring member shorter than the longitudinal length of the mass member 124. In addition, when the mass of the mass member 124 is the same, the distance between the support portion of the leaf spring member 121b and the distal end portion of the mass member 124 is longer in the shape that is longer in the longitudinal direction. The amplitude force at the point increases, and the collision force increases.

  Further, the bottomed cylindrical portion 123a of the impact rubber elastic body 123 is inserted into the tip of the mass member 124 by press fitting. Here, the mass member 124 has a sufficiently large thickness in the plate thickness direction. Therefore, by press-fitting the bottomed cylindrical portion 123a to the tip of the mass member 124, a sufficient press-fitting allowance can be secured as a result of ensuring a sufficient contact area between them. Thereby, it is possible to prevent the collision rubber elastic body 123 from being detached from the mass member 124.

  Furthermore, in this embodiment, the collision part 123b of the rubber elastic body 123 for collision collides with the fixed member 121a formed integrally with the leaf spring member 121b. That is, the collision force by the collision part 123b depends on the shape of the fixing member 121a and the positional relationship with the fixing member 121a. Therefore, the collision force by the collision part 123b is irrelevant to the shape of the joist which is the building structure 105. In other words, the impact force must be adjusted without affecting the shape of the joist which is the building structure 105 and before attaching the vibration control device for the building structure to the joist which is the building structure 105. Is possible.

[Modification of Embodiment 2]
In the second embodiment, the bottomed cylindrical portion 123a is press-fitted into the tip of the mass member 124 so that the collision rubber elastic body 123 has the bottomed cylindrical portion 123a. In addition, as shown in FIG. 8, only the portion corresponding to the collision portion 123 b of the above-described collision rubber elastic body 123 may be directly fixed to the mass member 124. For example, it can be fixed by using an adhesive or by vulcanization adhesion.

[Embodiment 3]
In the second embodiment, the collision rubber elastic body 123 is attached to the mass member 124. However, as shown in FIG. 9, the collision rubber elastic body 133 can be fixed to the fixing member 121a. In this case, the collision rubber elastic body 133 is installed in contact with the mass member 124 when the joist which is the building structure 105 is not vibrating. However, the collision rubber elastic body 133 is not fixed to the mass member 124 and can be separated from the mass member 124. That is, the collision rubber elastic body 133 is separated from the mass member 124 or pressed from the mass member 124 and repeatedly collides with the mass member 124. In this case, the same effects as those of the first and fourth embodiments are obtained.

[Embodiment 4]
In the second embodiment, the vibration control device for a building structure is disposed inside the joist which is the building structure 105 that vibrates. In addition to this, as shown in FIG. You may support and fix to an outer peripheral surface. As shown in FIG. 11, the vibration control device for a building structure may be supported and fixed to an adjacent part of the joist among the underfloor plates attached to the lower surface of the joist that is the building structure 105. In this case, as shown in FIG. 11, it is also possible to arrange the vibration control devices for building structures on both sides of the joists. All of these are effective when it is difficult to install the inside of the joist because the damping device for the building structure is attached to the outer side of the joist.

[Embodiment 5]
FIG. 12 is a front view of a state in which the vibration damping device for a building structure according to the present embodiment is attached to a floor that is a building structure. In the above embodiment, the vibration damping device for a building structure is attached to the joist of the vibrating building structure, but in this embodiment, it is attached to the lower surface of the floor. Here, when this floor is formed of, for example, ALC (foamed lightweight concrete) or the like, it is effective to apply this embodiment. As shown in FIG. 12, the vibration damping device for a building structure according to this embodiment includes a fixing member 141, a leaf spring member 142, a mass member 143, a collision rubber elastic body 144, and a fall prevention member 145. It is configured.

  The fixing member 141 is formed in a long flat plate shape, two through holes are formed, and a nut is welded to the lower surface of the left through hole in FIG. The leaf spring member 142 is formed by bending a steel plate into a crank shape, and one end surface is welded to the lower right side of the fixing member 141 in FIG. That is, the leaf spring member 142 stands downward from the lower surface of the fixing member 141, and the other end surface thereof faces the fixing member 141 in parallel. Further, a through hole is formed on the welding surface of the leaf spring member 142 so as to communicate with the through hole formed in the fixing member 141, and a nut is welded to the lower surface thereof. The fixing member 141 and the leaf spring member 142 are arranged on the lower surface of the floor, which is the building structure 105, and are screwed into the building structure 105 by screwing bolts inserted from the upper surface of the floor, which is the building structure 105. It is attached to a certain floor.

  The mass member 143 is fixed to the end of the other end surface of the leaf spring member 142. The impact elastic rubber body 144 has a bottomed cylindrical portion 144a inserted into the outer peripheral surface of the tip of the mass member 143 by press fitting, and the impacted portion 144b protrudes above the bottomed cylindrical portion 144a. Are integrally molded. And when the floor which is the building structure 105 is not vibrating, the front-end | tip of the collision part 144b is arrange | positioned in the state which contacted the lower surface of the fixing member 141. FIG. In other words, the present embodiment is substantially in a state of being inverted upside down in the second embodiment described above. Also in this case, it was confirmed that the same effects as those of the second embodiment were obtained.

  The fall prevention member 145 is integrally formed with the fixing member 141, and is bent so as to extend below the mass member 143. That is, when the mass member 143 is vibrated greatly, the fall prevention member 145 has an effect of contacting the lower surface of the mass member 143 and suppressing the amplitude thereof. That is, the fall prevention member 145 prevents the mass member 143 from being detached from the leaf spring member 142 by suppressing an excessive displacement of the mass member 143.

[Embodiment 6]
FIG. 13 is a front view showing a state in which the vibration damping device for a building structure according to the present embodiment is attached to the floor of the ALC that is the building structure. As shown in FIG. 13, the vibration damping device for a building structure of the present embodiment includes a fixing member 141, an auxiliary fixing member 146, a leaf spring member 142, a mass member 143, a collision rubber elastic body 147, The fall prevention member 145 is comprised.

  The auxiliary fixing member 146 is bent in a crank shape, and one end surface is welded to an end portion of the fixing member 141 opposite to the side on which the leaf spring member 142 is welded. The other end surface of the auxiliary fixing member 146 is disposed at a position spaced a predetermined distance downward from the distal end portion of the mass member 143. The impact rubber elastic body 147 has a bottomed cylindrical portion 147a inserted into the outer peripheral surface of the distal end portion of the mass member 143 by press fitting, and the impact portion 147b projects downward from the bottomed cylindrical portion 144a. Are integrally molded. And when the floor which is the building structure 105 is not vibrating, the front-end | tip of the collision part 147b is arrange | positioned in the state which contacted the upper surface of the auxiliary | assistant fixing member 146. That is, when the floor which is the building structure 105 vibrates, the collision part 147b collides with the other end surface of the auxiliary fixing member 146.

  In this case, even if the leaf spring member 141 is supported and fixed to the lower surface of the floor, which is the building structure 105, the position where the mass member 143 and the auxiliary fixing member 146 collide is always the tip of the mass member 143. Below the part. Originally, the tip of the leaf spring member 141 bends downward due to gravity, with the support portion of the leaf spring member 141 as the center. That is, it is easy to make the mass member 143 and the auxiliary fixing member 146 contact each other in a state where the floor which is the building structure 105 is not vibrating.

[Other Embodiments]
In the said embodiment, it demonstrated as a structure used as a cantilever support by a leaf | plate spring member. In addition, a configuration as shown in FIG. As shown in FIG. 14, the elastic members 153a and 153b and the mass members 154a and 154b are provided at both ends of the leaf spring member 152 with the support member 151 as the center. In this case, by adjusting the length from the support member 151 to both ends of the leaf spring member 152, the masses of the mass members 154a and 154b on both sides, etc., it is possible to have two types of natural frequencies.

It is a front view of the state attached to the building structure which vibrates the vibration damping device of the building structure which concerns on Embodiment 1 of this invention. It is a figure which shows the attachment state of the damping device of the building structure in Test 1. FIG. It is a figure which shows the test conditions and test result of Test 1. It is data which shows the test result of test 1, Comprising: It is data about the impact sound reduction value with respect to a floor mass ratio. It is data indicating the test result of Test 1, and is data on the impact sound level with respect to the octave band center frequency. It is data which shows the test result of test 1, Comprising: It is data about the acceleration of the vibration of the floor with respect to elapsed time. (A) is the left view of the state attached to the joist which is the building structure which vibrates the building structure damping device which concerns on Embodiment 2 of this invention, (b) is the damping of the building structure It is a front view of the state which attached the apparatus to joist. FIG. 6 is a diagram illustrating a modification of the second embodiment. It is a front view of the state attached to joist which is a building structure which vibrates the damping device of a building structure concerning Embodiment 3. It is a front view of the state attached to joist which is a building structure which vibrates the damping device of a building structure concerning Embodiment 4. It is a front view of the state attached to the joist which is the building structure which vibrates the vibration control apparatus of the other building structure which concerns on Embodiment 4. FIG. It is a front view of the state attached to the floor which is the building structure which vibrates the damping device of the building structure which concerns on Embodiment 5. FIG. It is a front view of the state attached to the floor which is a building structure which vibrates the damping device of the building structure which concerns on Embodiment 6. FIG. It is a figure which shows other embodiment.

Explanation of symbols

101, 121b, 142, 152 ... leaf spring members
102, 151 ... Support members 103, 123, 133, 144, 147, 153a, 153b ... Collision rubber elastic bodies 104, 124, 143, 154a, 154b ... Mass members 105 ... Vibrating building structures 110 ... Floor plates 111 ... Beams 121: Plate member 121a, 141: Fixing member
123a, 144a, 147a ... Bottomed cylindrical parts 123b, 144b, 147b ... Collision part 145 ... Fall prevention member 146 ... Auxiliary fixing member

Claims (11)

One or both ends in the same direction as the main vibration direction of the building structure with respect to the building structure formed of a rigid plate material having a predetermined mass and including any of a floor, joists, columns, beams, walls, and ceiling A plate spring member in which a predetermined support portion is supported and fixed so that the portion can vibrate,
At the time of vibration input, the vibration end portion of the leaf spring member or the leaf spring side attachment member integrally attached to the vibration end portion is integrally attached to the building structure or the building structure side. A vibration damping device for a building structure that suppresses vibration of the building structure by colliding with a mounting member,
The vibration end of the leaf spring member or the leaf spring side mounting member is disposed in contact with the building structure or the structure side mounting member when the building structure is not vibrating,
A portion of the vibration control device for the building structure that vibrates with respect to the building structure is tuned to have a natural frequency smaller than a natural frequency of the building structure that is a vibration suppression target due to the collision. A vibration control device for a building structure,   2. The building structure vibration damping device according to claim 1, wherein at least one of the leaf spring side mounting member and the structure side mounting member is made of an elastic body.   The building structure vibration damping device according to claim 1, wherein a mass member is installed on the vibration end portion side of the leaf spring member. When the direction connecting the support portion and the vibration end portion of the leaf spring member is defined as a longitudinal direction,
The base end portion of the mass member is attached to the vibration end portion of the leaf spring member so that the tip end portion thereof is located on the opposite side of the support portion with respect to the vibration end portion.
4. The vibration damping device for a building structure according to claim 3, wherein a length of the mass member in the longitudinal direction is longer than a length of the leaf spring member in the longitudinal direction.   The leaf spring side mounting member is made of an elastic body, and is formed of a cylindrical portion that is inserted into the outer peripheral surface of the mass member by press-fitting, and an elastic body that is integrally formed with the cylindrical portion, and the building structure or the structure The building structure vibration damping device according to claim 3, further comprising a collision portion that collides with the side mounting member. The structure-side mounting member is fixed to the leaf spring member,
The building structure according to any one of claims 1 to 5, wherein the vibration end portion of the leaf spring member or the leaf spring side attachment member collides with the structure side attachment member at the time of vibration input. Damping device for things. The building structure damping device is a device for suppressing floor vibration,
The said leaf | plate spring member is a vibration control apparatus of the building structure as described in any one of Claims 1-6 supported and fixed inside the hollow joist attached under the said floor. The building structure damping device is a device for suppressing floor vibration,
The said leaf | plate spring member is a vibration control apparatus of the building structure as described in any one of Claims 1-6 supported and fixed to the outer peripheral surface of the joist attached under the said floor. The building structure damping device is a device for suppressing floor vibration,
The building includes a joist attached under the floor, and an underfloor plate attached to the lower surface of the joist,
The said leaf | plate spring member is a vibration control apparatus of the building structure as described in any one of Claims 1-6 supported and fixed to the adjacent site | part of the said joist in an underfloor board | plate material. The building structure damping device is a device for suppressing floor vibration,
The leaf spring member is supported and fixed to the lower surface of the floor,
The structure-side mounting member is formed to be disposed below the vibration end portion of the leaf spring member or the leaf spring side mounting member, and the vibration end portion or the leaf spring side mounting member collides with an upper surface thereof. The building structure damping device according to any one of claims 1 to 6, wherein: The building structure damping device is a device for suppressing floor vibration,
The leaf spring member is supported and fixed to the lower surface of the floor,
The upper part of the vibration end portion of the leaf spring member or the leaf spring side mounting member collides with the building structure or the structure side mounting member. A vibration control device for the building structure described.

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