JP2001124136A - Vibration control device for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device capable of sufficiently exhibiting expected vibration control performance in an actually arranged state by paying attention to the fact that a natural frequency of a building largely changes by the input direction in the vibration control device for the building arranged on the rooftop or the like of a detached house. SOLUTION: A weight member 24 is supported by high damping laminated rubber 3 so as to impart horizontal directional restoring force and damping force. A frequency adjusting mechanism 20 is arranged for changing/adjusting a natural frequency of a vibration system when the weight member 24 vibrates in the horizontal direction. A building side member 28 connected to the building and a weight side member 29 connected to the weight member 24 adjacently to the building side member 20 are provided as the frequency adjusting mechanism 20, and are formed as a structure for detachably installing plural metallic plate springs 35 between both members 28, 29. Direction regulating laminated rubber 14 is arranged between both members 28, 29. The plate springs may be formed of a rubber plate spring 36 having a damping function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for buildings, and more particularly to reducing unpleasant horizontal vibrations (small vibrations) caused by strong winds and traffic vibrations in small buildings such as houses. It belongs to the technical field of a vibration damping device suitable for performing vibration control.

[0002]

2. Description of the Related Art Conventionally, as a vibration damping device for a building of this type, Japanese Patent Application Laid-Open No. 8-128228 and Japanese Patent Application Laid-Open No.
As disclosed in Japanese Patent No. 8229, there is known a structure in which a vibration system having a weight member elastically supported is attached to a building to attenuate the swing of the building.

That is, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 8-128229, a rod-shaped weight is supported on a bracket via a plurality of laminated rubbers, and the weight is vibrated minutely by the restoring force of the laminated rubber. The vibration is attenuated by a damping material provided between the weight and the bracket. Also, in this device, in order to effectively propagate the vibration of the building to the weight, it is necessary to adjust the natural frequency of the vibration of the weight to be substantially equal to the natural frequency of the building. Coil spring is interposed between the weight and the bracket.

[0004]

By the way, generally,
Since the natural frequency of a building varies greatly depending on the direction of vibration input, the natural frequency of the weight is adjusted in advance by a coil spring interposed between the weight and the bracket, as in the aforementioned conventional vibration damping device. In such a configuration, when the vibration damping device is actually installed in a building, the natural frequency is greatly shifted, and the desired vibration damping effect may not be obtained.

On the other hand, it is conceivable to prepare a plurality of coil springs having different spring constants in advance, install the vibration damping device on a building, and change and adjust the natural frequency by replacing the coil springs. For that purpose, it is necessary to bring a large number of coil springs to the installation site of the vibration damping device, and since the work has to be performed while replacing the coil spring, the installation work of the vibration damping device becomes extremely complicated. There's a problem.

Further, when the spring constant of the coil spring is increased to adjust the frequency, the damping ratio of the vibration system is reduced, and the damping ratio falls out of an appropriate range where a sufficient damping performance can be obtained. There is a possibility that the damping performance is impaired.

The present invention has been made in view of the above points, and a main object of the present invention is to provide a vibration damping device for a building in which a weight member is elastically supported. Focusing on the fact that the natural frequency of an object greatly changes depending on the input direction of the vibration, devising the adjustment of the natural frequency in the horizontal vibration of the weight member, and ensuring the desired vibration suppression performance in the actual installation state An object of the present invention is to provide a vibration damping device that can be exerted on a vehicle.

[0008]

In order to achieve the above object, according to the present invention, a vibration damping device is provided with a frequency adjusting mechanism capable of changing and adjusting a natural frequency of a vibration system of the vibration damping device. The natural frequency can be changed and adjusted according to.

Specifically, the invention according to claim 1 is characterized in that a vibration system comprising a weight member and an elastic support member for elastically supporting the weight member so as to be displaceable in a horizontal direction is attached to a building. It is assumed that a vibration damping device for a building that reduces horizontal vibration of the building is used. The elastic bearing member is made of a high damping laminated rubber that applies a horizontal restoring force and a damping force to the weight member, and changes a natural frequency of a vibration system when the weight member vibrates in the horizontal direction. An adjustable frequency adjustment mechanism is provided.

With the above structure, when vibration is input to the building, the weight member is displaced in the horizontal direction while receiving a restoring force from the high-damping laminated rubber and the rubber member. Is consumed, and the vibration of the building is attenuated. This eliminates the need to provide a dedicated damping material for imparting a damping force to the weight member, thereby reducing the number of components and reducing costs.

Further, since a vibration frequency adjusting mechanism capable of changing and adjusting the natural frequency of the vibration system is provided, the vibration frequency adjusting mechanism can be used in a state where the vibration damping device is actually installed on the building. The frequency can be changed and adjusted to substantially match the building, whereby the vibration damping device can exhibit the desired vibration damping performance.

According to a second aspect of the present invention, the frequency adjusting mechanism according to the first aspect of the present invention includes a building-side member connected to a building, and is disposed adjacent to the building-side member. A plurality of weight members connected to each other, the plurality of weight members being disposed between the building-side member and the weight-side member, and having one end fixed to the building-side member and the other end fixed to the weight-side member. And a leaf spring.

With this configuration, the natural frequency of the vibration system can be easily changed and adjusted by changing the number of leaf springs disposed between the building-side member and the weight-side member. In addition, by using a plurality of leaf springs, it is possible to finely adjust the natural frequency without increasing the size of the entire apparatus and increasing the cost. Can be obtained.

According to the third aspect of the present invention, the horizontal displacement of the weight member is allowed in one direction between the building-side member and the weight-side member in the second aspect, while limiting the other direction. A regulating laminated rubber shall be provided.

That is, since the natural frequency of a building generally differs greatly depending on the direction of vibration input, the natural frequency when the weight member vibrates in one predetermined direction is adjusted according to the building. However, when the weight member vibrates in a direction other than the one direction, sufficient damping performance cannot be obtained. Therefore, in the present invention, by limiting the horizontal displacement of the weight member to only the one direction using the laminated rubber, at least the one-way vibration component among the vibration components of the building is effectively attenuated. Can be done. In addition, by using the laminated rubber, the horizontal displacement of the weight member can be allowed to be sufficiently large in the one direction, and the displacement direction of the weight member can be limited in such a manner. Does not increase, and does not impair the vibration damping action for minute vibration.

According to a fourth aspect of the present invention, the building-side member and the weight-side member according to the third aspect of the present invention are rotationally displaced about the vertical axis integrally with the direction-controlling laminated rubber and the plurality of leaf springs, It is configured to be connectable to the building and the weight member at two positions which are rotationally displaced by approximately 90 °.

In this configuration, the building-side member, the weight-side member, the direction-controlling laminated rubber, and the leaf spring are integrally rotationally displaced around the vertical axis and connected to the building and the weight member, respectively. Thus, the allowable direction of the horizontal displacement of the weight member can be easily changed and set. Then, if two vibration damping devices in which the displacement permissible directions of the weight members are different from each other by approximately 90 ° are used side by side,
Since the horizontal vibration of the building can be effectively attenuated in two directions substantially orthogonal to each other, excellent vibration damping performance can be obtained in all directions in the horizontal direction. Even if the arrangement space of the vibration damping device is limited, effective vibration damping performance can be obtained in all horizontal directions.

According to a fifth aspect of the present invention, the frequency adjusting mechanism of the first aspect is provided with a rubber leaf spring for adjusting the natural frequency of the vibration system. As a result, since the rubber leaf spring itself has a large damping coefficient, even if the number of the leaf springs is increased to increase the spring constant of the vibration system, the convergence of the vibration is not greatly reduced. That is, when the natural frequency of the vibration system is adjusted, a change in the damping ratio accompanying the adjustment can be suppressed, and the vibration damping performance can be stably secured.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 to 4 show a vibration damping device A for a building according to a first embodiment of the present invention. This vibration damping device A is, for example, the roof of a small building such as a reinforced concrete house. The frequency adjusting mechanism 20 has a compact size and shape suitable for installation in a building, and is capable of changing and adjusting the natural frequency of a vibration system including a weight member or the like in accordance with the natural frequency of the installed building. It has.

In each of the drawings, reference numeral 21 denotes a center frame having a length extending in the entire longitudinal direction of the vibration damping device A (Y direction in the drawing; hereinafter, also simply referred to as Y direction). Is bent along the creases extending in the longitudinal direction on both sides in the width direction of the steel plate to form a flange portion lowered by one step. At both ends of the center frame 21 in the longitudinal direction, a mounting base plate 22 extending in the width direction (X direction in the drawing: hereinafter simply referred to as X direction) so as to be orthogonal to the center frame 1 in plan view. , 22 are fixed to the lower surface of the flange portion of the center frame 21 with bolts or the like. The mounting base plates 22, 22 allow the vibration damping device A to be mounted at a predetermined location in the building. ing.

In the vicinity of both ends in the longitudinal direction (X direction) of the mounting base plates 22, 22, respectively, in the width direction (Y direction).
Are formed along the folds of the first direction, and the high-attenuation laminated rubber 3 extends in the up-down direction (Z direction shown in the figure: hereinafter simply referred to as Z direction) on each of the protrusions. It is arranged as follows. And, so as to cover the upper part of the center frame 21 and the mounting base plate 22,
Steel frame 23 has four corners with high damping laminated rubber 3,
, And two block-shaped weight members 2 on the main frame 23.
4, 24 are arranged apart from each other in the Y direction. That is, the weight members 24, 24 are attached to the main frame 2
3 are elastically supported by the high damping laminated rubbers 3, 3,... So as to be displaceable in the horizontal direction, and when the vibration is input to the building, the high damping laminated rubbers 3, 3,. A restoring force and a damping force are applied.

The high-damping laminated rubber 3 has a damping function by mixing carbon in the rubber compound, and has a structure similar to that of ordinary laminated rubber. And laminated alternately in the axial direction,
It is formed into a cylindrical shape by vulcanization bonding. The rubber compound of the high attenuation laminated rubber 3 has a loss coefficient of 0.05 to
For example, natural rubber, isoprene rubber, chloroprene rubber, ethylene propylene rubber, butyl rubber, butadiene rubber and the like are used.

The rubber compounding of the high damping laminated rubber 3 is as follows.
It is sufficient that the weight members 24, 24 can provide an appropriate restoring force and damping force. However, in a small-scale building such as a house, the weight is relatively light, so that the vibration system ( It is considered that the mass ratio between the sub-vibration system) and the vibration system (main vibration system) composed of the building itself is about μ = 0.005 to 0.02, and the suitable loss factor corresponding to this is as described above. Becomes 0.05 to 0.15. Further, the loss coefficient is preferably 0.07 to 0.13, and 0.08 to 0.13.
0.12 is more preferable, and 0.09 to 0.11 is particularly preferable. This is because if the loss coefficient is too small, the damping property is insufficient, while if the loss coefficient is too large, permanent distortion is likely to occur, and the restoring property is insufficient.

The main frame 23 is formed with flange portions 23a, 23a which respectively hang downward on both sides in the width direction (X direction) of the rectangular steel plate. A rectangular opening 23b is formed in the portion, and flange portions 2 which are directed downward also at the peripheral portions on both sides in the Y direction of the opening 23b.
3c and 23c are formed. On the other hand, the opening 23
A base member 26 formed by bending a steel plate into a substantially U-shape is disposed on the center frame 21 directly below the center frame 21b.
While being overlapped on top and joined by welding etc.,
The upper surface of the base member 26 is positioned substantially on the same plane as the upper surface of the main frame 23.

The weight members 24, 24 are laminated with a plurality of plates 24a, 24a,... Having a predetermined weight, and are integrally formed on the main frame 23 by bolts 25, 25,. Is fixed to
By changing the number of the plates 24a, 24a,..., The weight can be changed and the natural frequency of the vibration system can be adjusted. In this embodiment, the weight of one weight member 24 is adjusted to be about 150 kg.

As a characteristic feature of the present invention, the opening 23b is provided at a substantially central portion of the upper surface of the main frame 23 at an intermediate position between the two weight members 24, 24 as shown in FIGS. A frequency adjusting mechanism 20 for changing and adjusting the natural frequency of the vibration system due to the horizontal displacement of the weight members 24, 24 and the main frame 23 is provided so as to straddle the upper surface of the base member 26 with the sandwiching therebetween. I have.

The frequency adjusting mechanism 20 is disposed on a base member 26 and is connected to a building via the base member 26 so as to sandwich the building side member 28 therebetween. Two weight-side members 29 are arranged on the main frame 23 on both sides in the Y direction. Specifically, as shown in FIG.
8 and the weight-side members 29, 29 are each formed by bending a substantially cross-shaped steel plate to form four wall portions so as to be erected upward from four sides of a central bottom portion, respectively. It has a box-like structure with a gap between them and opening upward. Then, the bottom portion 28a of the building-side member 28 is superimposed on the base member 26, and a bolt 30 (FIGS. 2 and 3) is attached to the base member 26.
), The bottom 29a of each weight side member 29 is superimposed on the main frame 23, and the bolts 30
To be fastened and fixed.

A direction regulating member is provided between the wall portions 28b, 28b on both sides in the Y direction of the building-side member 28 and the wall portion 29b of the weight-side member 29, which faces the outside of the both wall portions 28b, 28b. The laminated rubber 14 is disposed so as to extend substantially horizontally with its axial direction directed in the Y direction, and one end of the laminated rubber 14 is fixed to the wall 28b of the building-side member 28, while the other end is The weight member 29 is fixed to the wall 29b. That is, the laminated rubbers 14, 14
Are arranged so as to allow the relative displacement in the X direction of the building-side member 28 and the weight-side member 29 while preventing the relative displacement in the Y direction.

Inside the walls 28c, 28c on both sides in the X direction of the building-side member 28, plate members 32 made of a steel plate are superimposed on the wall 38c, respectively.
The plate member 32 is fixed to two adjacent
It is arranged so as to be fitted into a gap between the two wall portions 28b and 28c and extend in the Y direction. Similarly, plate members 34, 34 are attached to the weight-side members 29, 29, respectively, and these plate members 32, 34, 34 are both side portions of the building-side member 28 and the weight-side member 29 in the X direction. Are arranged on the same plane in the Y direction. Further, a plurality of leaf springs 35, 35,... Are vertically arranged in parallel across the adjacent plate members 32, 34.

That is, two adjacent plate members 32, 3
, Four leaf springs 35, 35,... Are arranged in the illustrated example so as to extend horizontally and vertically, and one end of each leaf spring 35 is an end of the plate member 32. While the other end of each leaf spring 35 is
It is designed to be bolted to the end. In other words, one end of each leaf spring 35 is connected to the building via the plate member 32 and the building-side member 28, while the other end is connected to the weight via the plate member 34 and the weight-side member 29. The number of leaf springs 35, 35,... Is changed to change the spring constant of the vibration system when the weight members 24, 24 are displaced in the X direction and vibrate. By changing the frequency, the natural frequency of the vibration system can be finely changed and adjusted.

Further, the frequency adjusting mechanism 20 having the above-described configuration is rotationally displaced about a vertical axis z passing through a substantially central portion of the building side member 28 as a whole, as shown in FIG.
It is fixed to the base member 26 (on the building side) and the main frame 23 (on the weight member side) at positions approximately 90 ° rotationally displaced. That is, at predetermined positions on both sides in the Y direction of the opening 23b of the main frame 23,
Bolt holes 23d, 23d for fixing the weight side members 29 are provided respectively.
The bolts 30 that penetrate the bottom 29a of the weight-side member are screwed and fastened to d and 23d (see FIG. 3), thereby fixing the weight-side members 29 and 29 to both sides of the opening 23b in the Y direction. Similar bolt holes 23e are provided at predetermined positions on both sides of the opening 23b in the X direction, respectively. As shown in FIG. 10, the frequency adjusting mechanism 20 as a whole is arranged around the vertical axis z. The weight side member 29 is fixed to the main frame 23 on both sides in the X direction of the opening 23b by being rotated by about 90 ° in the same manner as described above.

In FIGS. 2 to 4, reference numeral 18 denotes a casing which is formed large so as not to hinder the vibration of the weight members 24, 24 and is attached so as to cover the entire vibration damping device A.

When installing the vibration damping device A as described above on the roof of a small-scale building such as a reinforced concrete house, first, an appropriate space where the vibration damping device A can be installed side by side in the building is selected. The natural frequency of the horizontal vibration of the building is calculated by calculation in each of the two vertical and horizontal directions that are orthogonal to each other in plan view in the space.
Then, the weights of the weight members 24 are adjusted so that the natural frequencies of the vibration systems of the two vibration damping devices A are approximately equal to the two calculated natural frequencies, respectively.

At this time, as shown in FIGS. 1 to 4, one of the two vibration damping devices A has a weight member 24,
24 is made to vibrate in the width direction (X direction).
As shown in FIG. 6, the other vibration damping device A brings the weight members 24, 24 into a state of vibrating in the longitudinal direction (Y direction). That is, in the other vibration damping device A, first,
The bolts 30 for fixing the building side member 28 of the frequency adjusting mechanism 20 to the base member 26 are removed, and the bolts 30 and 30 for fixing the two weight side members 29 and 29 to the main frame 23 are also removed. remove.

Subsequently, the building-side member 28, the weight-side members 29, 29, the direction regulating laminated rubber 14, 14, the plate members 32, 34, 34 and the plate springs 35, 35,. Rotate about 90 ° about z. Then, as shown in FIG. 6, the building-side member 28 is fastened and fixed to the base member 26 again with bolts 30.
The weight-side members 29, 29 are respectively connected to the X of the opening 23b.
It is fastened and fixed to the main frame 23 by bolts 30 on both sides in the direction.

Then, the two vibration damping devices A are installed side by side on the roof of a building, and the building is vibrated with a weak force, and while observing a state in which the vibration is actually attenuated, By increasing or decreasing the leaf springs 35, 35, respectively, the natural frequency of the weight members 24, 24 is finely adjusted so as to substantially match the natural frequency of the building.

In the building in which the two vibration damping devices A are installed in this way, when the building is vibrated by strong winds, traffic vibrations, or the like, the weight members 24, 24 become high-damping laminated rubbers 3, 3. ,… Vibrates in the horizontal direction while receiving the restoring force, and the energy of the vibration is reduced by the high attenuation
The vibration is gradually attenuated by being consumed by the deformation of. That is, the weight members 24, 24 perform damping vibration while receiving damping force together with restoring force from the high damping laminated rubbers 3, 3,..., Thereby reducing vibration of the building.

At this time, in one vibration damping device A, the horizontal displacement of the weight members 24, 24 is restricted only in the longitudinal direction (Y direction), that is, in one predetermined direction of the building, and in the other directions. Since the displacement is prevented and the natural frequencies substantially coincide with each other, the one-way vibration component of the vibration of the building is extremely effectively attenuated. Similarly, the other vibration damping device A extremely effectively attenuates a vibration component in a direction orthogonal to the one direction among the horizontal vibrations of the building.

Therefore, the vibration damping device A of the first embodiment
Can impart not only a restoring force but also a damping force to the weight members 24, 24 by means of the high damping laminated rubbers 3, 3,. The reduction can reduce the cost of the apparatus. Also, while the weight members 24, 24 are allowed to change in the horizontal direction in one direction by the laminated rubbers 14, they are prevented in the other direction, so that the frictional resistance is increased like a slide bearing or the like. It is possible to extremely effectively attenuate the one-way vibration component of the building without causing the vibration, that is, without impairing the vibration damping action for the minute vibration.

Moreover, by adjusting the number of plates 24a, 24a,... Constituting the weight members 24, 24, the natural frequency of the vibration system is adjusted in advance.
With the vibration damping device A actually installed on the building, the leaf spring 3
By changing the number of sheets 5, 35,..., The natural frequency of the vibration system in the vibration permissible direction can be more finely adjusted to be substantially equal to the natural frequency of the building. Performance can be fully exhibited. In addition, since both ends of the leaf spring 35 are bolted to the plate members 32 and 34, the accuracy of assembly can be easily improved, and the leaf spring 35 and the plate member 3 can be easily assembled.
It is possible to eliminate the backlash at the joint portion with the second and the third, and to reliably and stably obtain the above-mentioned effect.

Further, in the vibration damping device A of this embodiment,
Without changing the installation direction of the device, only by changing the mounting position (angle) of the frequency adjusting mechanism 20, the weight members 24, 2
Since the permissible direction of the vibration (horizontal displacement) of No. 4 can be easily changed and set, even if the arrangement direction of these vibration damping devices A is restricted, each of the two vibration damping devices A is moved by the vibration of the building. Are arranged so as to attenuate the components in two directions orthogonal to each other, and the shaking of the building can be effectively attenuated in all horizontal directions.

(Embodiment 2) FIG. 7 shows Embodiment 2 of the present invention.
1 shows a vibration frequency adjusting mechanism 20 of a vibration damping device A according to the first embodiment.
35, rubber leaf springs 36, 36,... Having a damping function are used. The overall configuration of the vibration damping device A according to the second embodiment is the same as that of the first embodiment.
Therefore, the same members will be denoted by the same reference numerals and description thereof will be omitted.

The plate springs 36, 36,... Are formed by vulcanizing and bonding steel reinforcing plates 38, 38 to both ends in the longitudinal direction of an elongated strip-shaped rubber plate 37, as shown in FIG. Through holes 37 penetrating through rubber plate 37 and reinforcing plate 38, respectively
a, 38a are provided, and are attached to the plate members 32, 34 by bolts (not shown) inserted into the through holes 38a of the reinforcing plate 38 in a loosely fitted state. The rubber leaf springs 36, 36,... Have a damping function by mixing carbon in the rubber compound in the same manner as the laminated rubbers 3, 14, and the rubber compound includes, for example, natural rubber. Rubber, isoprene rubber, chloroprene rubber, ethylene propylene rubber, butyl rubber, butadiene rubber and the like are used.

Here, the reason why the above-described rubber leaf springs 36, 36,... Are used in place of the metal leaf springs 35, 35,.

Generally, when a sub-vibration system composed of a weight member and an elastic body is attached to a building (main vibration system) to be damped to reduce the vibration of the building, the above-described method is used. And the natural frequencies of the two vibration systems are made to substantially match,
In order to smoothly propagate the vibration from the building to the weight member, and to effectively attenuate the vibration, it is necessary to appropriately set the damping ratio. That is, if the natural frequency of the sub-vibration system is f, the mass of the weight member is m, and the spring constant of the elastic body is k, f = 1/2 × π ×× (k / m) (Equation 1) ) And the damping ratio ζ of the auxiliary vibration system is as follows, where C is the damping coefficient of the system: ＝= π × f × C / k (Equation 2).

According to the above equation (1), for example, when the natural frequency of the sub-vibration system is increased, the number of leaf springs may be increased to increase the spring constant k as a whole. According to Equation 2, it can be seen that as the spring constant k increases, the damping ratio の of the system decreases in inverse proportion thereto. The fact that this damping ratio ζ becomes smaller means that
If the value of the damping ratio ζ is out of the appropriate range for obtaining sufficient damping performance,
Damping performance will be impaired.

On the other hand, as is apparent from the above equation (2), if the damping coefficient C of the system can be increased by any method, the damping ratio ζ also increases, and the above problem does not occur. For this reason, for example, if the damping coefficient C is increased by changing the rubber composition of the high damping laminated rubber 3 or the direction regulating laminated rubber 14, the temperature dependence of the characteristics of the laminated rubbers 3 and 14 is increased, and This causes a problem that the natural frequency of the system becomes unstable.

Therefore, in the vibration damping device A of the second embodiment, the rubber leaf springs 36, 3 having a relatively large damping coefficient C are used.
When the number of the leaf springs 36, 36,... Is increased in order to adjust the natural frequency of the sub-vibration system, the spring constant k of the vibration system increases, and at the same time, the damping coefficient increases. C also increases, so that the damping ratio に stays in an appropriate range.

Therefore, the vibration damping device A of the second embodiment
According to this embodiment, the same function and effect as those of the first embodiment can be obtained, and instead of the metal leaf springs 35, 35, the rubber leaf springs 36, 36, which themselves have a damping function, are used. By adjusting the number of the leaf springs 36, 36,..., The natural frequency of the vibration system can be adjusted while maintaining the damping ratio ζ in the optimum range, that is, while preventing the convergence of the vibration from decreasing. Fine adjustment can be performed so as to be optimal according to the object, and thus the vibration damping performance of the vibration damping device A can be optimally and stably exhibited.

The present invention is not limited to the first or second embodiment, but includes other various embodiments. That is, the vibration damping device A of each of the above embodiments
Is relatively small and lightweight, and can be easily installed on the beam above the ceiling or on the roof of a building. It has a remarkable effect on small buildings such as houses. However, the invention is not limited thereto, and the vibration damping device A can be used for a large-scale building such as a building.

Further, as the vibration damping device A, a device having four high-damping laminated rubbers 3, 3,... Has been described, but the number of the high-damping laminated rubbers 3, 3,. Needless to say.

The vibration damping device A of each of the above embodiments is mounted and fixed to the building by the mounting base plates 22, 22, and the mounting base plates 22, 22, the weight members 24, 24, and The high-damping laminated rubbers 3, 3,... Are interposed between the main frame 23, but the invention is not limited thereto. For example, the high-damping laminated rubbers 3, 3,. It is also possible to fix directly to

[0054]

As described above, claim 1 of the present application is as described above.
According to the vibration damping device for buildings according to the invention of claim 2,
Since it is not necessary to separately provide a member that gives the restoring force to the weight member and the damping material, the number of components can be reduced and the cost of the device can be reduced. In addition, while the vibration damping device is actually installed on the building, the natural frequency of the vibration system can be changed and adjusted by the frequency adjusting mechanism so as to substantially match the building, thereby providing a vibration damping device. The desired vibration damping performance can be fully exhibited.

Further, according to the third aspect of the present invention, the displacement direction of the weight member is regulated in one direction by the laminated rubber. Can be effectively attenuated.

Further, according to the fourth aspect of the invention, the allowable direction of the horizontal displacement of the weight member can be easily changed and set, so that even if the installation direction of the vibration damping device is restricted, two vibration damping devices can be used. By using the device, effective damping performance can be obtained in all the horizontal directions.

Further, according to the fifth aspect of the present invention, by using a rubber leaf spring having a damping function, by adjusting the number of leaf springs, it is possible to keep the damping ratio of the vibration system in an optimum range. That is, the natural frequency of the vibration system can be finely adjusted while preventing the convergence of the vibration from lowering, so that the vibration damping performance can be optimally and stably exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a vibration damping device according to a first embodiment of the present invention.

FIG. 2 is a front view illustrating a configuration of the vibration damping device according to the first embodiment.

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a side view of FIG. 2;

FIG. 5 is an exploded perspective view showing an enlarged configuration of a frequency adjusting mechanism.

FIG. 6 shows that the allowable direction of the horizontal displacement of the weight member is approximately 9
FIG. 5 is a diagram corresponding to FIG.

FIG. 7 is a diagram corresponding to FIG. 5 according to the second embodiment.

FIG. 8A is a front view showing the configuration of a rubber leaf spring, and FIG. 8B is a cross-sectional view taken along line bb of the front view.

[Explanation of symbols]

 A Building damping device 3 High damping laminated rubber 14 Direction regulating laminated rubber 20 Frequency adjustment mechanism 23 Main frame 24 Weight member 28 Building side member 29 Weight side member 35 Metal leaf spring 36 Rubber leaf spring

Claims (5)

[Claims] 1. A vibration system comprising a weight member and an elastic bearing member for elastically supporting the weight member so as to be displaceable in a horizontal direction is attached to a building to reduce horizontal vibration of the building. In the vibration damping device for a building as described above, the elastic bearing member is made of a high damping laminated rubber that applies a horizontal restoring force and a damping force to the weight member, and the vibration when the weight member vibrates in the horizontal direction. A vibration damping device for a building, comprising a frequency adjusting mechanism capable of changing and adjusting a natural frequency of a system. 2. The structure according to claim 1, wherein the frequency adjusting mechanism includes a building-side member connected to the building, and a weight-side member disposed adjacent to the building-side member and connected to the weight member. And, disposed between the building-side member and the weight-side member,
A vibration damping device for a building, comprising: a plurality of leaf springs having one end fixed to a building-side member and the other end fixed to a weight-side member. 3. The direction restricting device according to claim 2, wherein between the building-side member and the weight-side member, horizontal displacement of the weight member is allowed in one direction, while restricting in the other direction. A building vibration damper, wherein a laminated rubber is provided. 4. The building-side member and the weight-side member according to claim 3, wherein the building-side member and the weight-side member are rotationally displaced about a vertical axis integrally with the direction-controlling laminated rubber and the plurality of leaf springs, and are rotated by approximately 90 ° relative to each other. A vibration damping device for a building, wherein the vibration damping device is configured to be connectable to a building and a weight member at each of the two positions. 5. The vibration damping device for a building according to claim 1, wherein the vibration frequency adjusting mechanism includes a rubber leaf spring for adjusting a natural frequency of the vibration system.