JP2000193020A - Vibration reducing device for building structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel vibration reducing device to produce a stable vibration control effect even when the tuning state of a subvibration system to a main vibration system is changed due to a temperature change, in the vibration reducing device having a subvibration system constituted by elastically supporting a mass member on a building structure by a rubber mount. SOLUTION: A plurality of division masses 14 to provide an optimum mass responding to vibration to be controlled of a building structure 12 as a total mass of a whole is employed. The division masses 14 are mutually independently supported at the building structure 12 by a rubber mount to constitute a plurality of division subvibration systems 17. Different natural frequencies are set at the respective division subvibration systems 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reducing device which constitutes a sub-vibration system for a building structure such as a house and can exert a dynamic vibration absorbing effect on a building structure serving as a main vibration system.

[0002]

2. Description of the Related Art In a building structure such as a general house, vibration may be generated by an external force such as traffic vibration or wind acting as an exciting force. In particular, in recent years, 2
The number of floors and three-story buildings is increasing, and in those houses, a microtremor caused by traffic vibration is becoming a problem, for example, as a cause of unpleasant noise or uncomfortable vibration at bedtime.

[0003] By the way, as a vibration reducing device for a building structure, several damper devices for reducing the shaking of a high-rise building such as a high-rise building or a tower have been proposed.
For example, JP-A-3-74649 and JP-A-8-33
No. 8467 discloses a damper device having a structure in which an additional mass is elastically supported on a building structure by multi-layer laminated rubber. These damper devices constitute one auxiliary vibration system in the horizontal direction, thereby exhibiting an effect of reducing vibration in the horizontal direction caused by the building structure.

However, in these conventional damper devices,
If there is a difference between the natural frequency set in the sub-vibration system and the vibration to be damped in the building structure as the main vibration system, there is a problem that the effective vibration reduction effect is not exhibited. In particular, if the spring member of the damper device is formed of a rubber elastic body, the spring constant has temperature dependency,
It is difficult to stably obtain an effective damping effect, for example,
Attempting to house and arrange a damper device in the attic of a general house, the temperature of the attic varies between several tens of degrees below zero to as high as 60 to 70 ° C. It was hardly possible to obtain a stable vibration damping effect.

Japanese Patent Application Laid-Open No. 5-149026 discloses a sub-vibration system having a natural frequency different from that of a sub-vibration system tuned to the same natural frequency as the vibration frequency to be damped. A vibration suppression device such as a sloshing damper provided is disclosed. However, the vibration suppression device disclosed in this publication only considers vibration isolation of a large structure such as a high-rise building, and the vibration suppression device having a rubber member installed in a general house or the like elastically supports a mass member. The reduction device could not always be applied effectively. Specifically, for example, in the vibration suppression device described in this publication, it is unavoidable that the total weight of the entire device becomes large in order to install a plurality of sub-vibration systems. In some cases, it is difficult to adopt the structure because of insufficient strength of the building structure itself.

[0006]

Here, the present invention has been made in view of the above-described circumstances, and a problem to be solved is that even if there is a deviation in tuning frequency (tuning) due to a temperature change or the like. Another object of the present invention is to provide a vibration reducing device having a novel structure capable of stably exhibiting a good vibration damping effect against vibration to be damped in a building structure.

[0007]

An embodiment of the present invention which has been made to solve such a problem will be described below. In addition, each aspect described below can be adopted in any combination. In addition, it should be understood that aspects and technical features of the present invention are not limited to those described below, but are recognized based on the invention described in the entire specification and the drawings. is there.

[0008] A first aspect of the present invention is a vibration reduction device comprising a sub-vibration system, wherein a mass member is elastically supported by a plurality of rubber mounts on a building structure to be damped. The member is constituted by a plurality of divided masses, and the total mass of the divided masses is set to an optimum mass according to the vibration to be damped of the building structure, and each of the divided masses is set by the rubber mount. It is characterized in that a plurality of divided sub-vibration systems are configured by being elastically supported independently of each other on a building structure, and different natural frequencies are set for these divided sub-vibration systems.

In the vibration reducing apparatus according to the first aspect, by setting a plurality of natural frequencies by the plurality of divided sub-vibration systems, tuning of the sub-vibration system to vibration to be damped is performed. Even when the accuracy is not accurate, or when the tuning is shifted due to a temperature change or the like, a good vibration damping effect can be exerted as a whole. Moreover, in such a vibration reduction device, since the optimum mass is divided to form a plurality of divided sub-vibration systems,
An increase in the weight of the entire device can be advantageously avoided and can be advantageously installed on building structures. In addition, since each divided mass is elastically supported by a rubber mount,
It can be installed independently at any place, and a great degree of freedom can be secured with respect to the setting of the mounting place for the building structure. Therefore, such a vibration reducing device can be advantageously employed in, for example, a general house, and can achieve a stable vibration-proofing effect even when exposed to a large temperature change.

The optimum mass of a mass member composed of a plurality of divided masses is determined by, for example, the amplitude of the main vibration system in the equation of motion of the building structure as the main vibration system and the simultaneous equation of the divided sub vibration system as the sub vibration system. The amplitude of the rubber mount (the absolute value of the relative displacement between the main vibration system and the sub vibration system)
By giving the condition that each value is less than the required value, it can be determined as the mass ratio to the equivalent mass of the main vibration system, but at this time, the load bearing strength of the building structure should also be considered It is.

According to a second aspect of the present invention, in the vibration reduction device according to the first aspect, the natural frequencies of the plurality of divided sub-vibration systems are determined under a reference condition. It is characterized in that it is set to be located on both the low frequency side and the high frequency side of the vibration frequency of the building structure to be damped. This makes it possible to obtain an effective vibration reduction effect even when the tuning characteristics of the sub-vibration system with respect to the main vibration system change due to a wider range of causes. The reference condition is, for example, a condition that occurs most frequently.

According to a third aspect of the present invention, in the vibration reduction device according to the first or second aspect, at least one of the divided masses constituting the plurality of divided sub-vibration systems is provided.
With a different mass from the other divided mass, in the divided sub-vibration system set to the natural frequency closest to the vibration frequency to be damped of the building structure, that the divided mass of the largest mass was adopted, Features. In the vibration reduction device according to this aspect, the divided sub-vibration system having the divided mass with the largest mass appears at the highest frequency, almost tuned to the vibration to be damped in the main vibration system. Below,
The vibration control effect by the divided sub-vibration system having the divided mass having the largest mass is more effectively exerted. That is, if a long-term vibration suppression effect in a large number of vibration reduction devices in consideration of a tuning error, a temperature change, and the like is totally captured, by adopting the structure according to this aspect,
It is possible to improve the damping effect.

According to a fourth aspect of the present invention, in the vibration reduction device according to any one of the first to third aspects, each of the divided sub-vibration systems includes a ceiling part on a top floor of a general house. It is characterized in that it is supported and placed in the attic. In such a vibration reduction device according to this aspect, it is possible to advantageously secure a space for installing the vibration reduction device in a general house and to obtain an excellent vibration damping effect in a vibration mode. In addition, a decrease in the vibration suppression effect due to a shift in tuning due to a change in the temperature of the rubber mount is reduced or avoided by a plurality of divided sub-vibration systems having different natural frequencies.
Even if it is exposed to a remarkable temperature change in the attic, a stable vibration damping effect is exhibited. In addition, the general house is an individual house or an apartment house, which refers to a one-story building house that does not belong to a high-rise building, and generally includes a house having various structures such as a wooden structure, a steel frame, or reinforced concrete.

According to a fifth aspect of the present invention, in the vibration reduction device according to any one of the first to fourth aspects, at least one of the plurality of divided sub-vibration systems includes another divided sub-vibration system. It is characterized by being supported by a structural member different from the system. In the present invention, by dividing the mass member having the optimum mass into a plurality of divided masses, the load of the mass member can be shared and supported by the plurality of structural members. For example, in a general house or the like, a mass member having a large mass as a whole can be advantageously mounted within the limit of the load-bearing strength of a building structure. In addition, various structural members (strength members) of the building structure can be adopted as the structural member according to the structure, type, and the like of the building structure. Specifically, for example, in a general house, each divided mass can be supported by members such as various beams, slabs, girders, and edges.

According to a sixth aspect of the present invention, in the vibration reducing device according to any one of the first to fifth aspects of the present invention, the mounting directions of the rubber mounts in the sub-vibration system with respect to the divided masses are respectively changed. By including a variable rubber mount that can adjust the spring constant in the horizontal elastic main axis direction in the split sub-vibration system,
In each of the divided sub-vibration systems, a different natural frequency is set for each of the divided sub-vibration systems by making the mounting direction of the variable rubber mount to the divided mass different. In this embodiment,
The elastic main shaft in the split sub-vibration system is defined as the load input direction and the displacement direction of the mass member due to the elastic deformation of the rubber mount when a load is input along the axis to the split sub-vibration system. And an axis in which rotation or angular displacement does not occur in the divided mass.

In the vibration reducing device according to the sixth aspect, the natural frequency in the direction of the horizontal elastic main axis in the divided sub-vibration system is adjusted by changing the mounting direction of the variable rubber mount with respect to the divided mass. I can do it. Therefore, for example, even if the same rubber mount is employed in a plurality of divided sub-vibration systems, the natural frequency of each divided sub-vibration system can be adjusted to a different value. In addition, since the spring constant of the split sub-vibration system can be set according to the mounting direction of the variable rubber mount, the natural frequency of each split sub-vibration system can be set according to the vibration to be damped of the building structure. Can be tuned with a high degree of accuracy, whereby an excellent vibration damping effect can be easily obtained. When the mounting direction of the variable rubber mount is changed, it is necessary to change the mounting direction of the variable rubber mount so that the direction of the elastic main shaft in the horizontal direction of the entire divided sub-vibration system does not change. It is more desirable in view of the characteristics and the dynamic stability of the split sub-vibration system.

The structure of the variable rubber mount employed in the sixth aspect is not limited at all. Specifically, for example, a mount having a structure in which a first attachment member attached to the mass member side and a second attachment member attached to the building structure side are elastically connected by a rubber elastic body, By providing a lightening hole or a through slit or the like in the rubber elastic body, it is possible to impart anisotropy to the spring characteristic in the direction perpendicular to the axis, or to provide the first mounting member and the second mounting member connected by the rubber elastic body. By inclining the facing surface, anisotropy in the direction perpendicular to the axis can be imparted.
By imparting anisotropy in the direction perpendicular to the axis by embedding and fixing an inclined plate as described in 338467 or the like in a rubber elastic body, the spring characteristic in the direction perpendicular to the axis is anisotropic about the central axis. Rubber mount
It is possible to adjust the spring constant of the split mass in the direction of the horizontal elastic main axis by changing the mounting direction for the split mass around the central axis by mounting the split mass in a state where the weight of the split mass is exerted in the substantially central axis direction. A rubber mount having the above structure can be adopted. Alternatively, by using a rubber mount in which the spring characteristics in the direction perpendicular to the axis are the same in all directions around the central axis, by changing the mounting angle of the rubber mount to the divided mass in the vertical direction or the horizontal direction, It is also possible to configure a variable rubber mount so that the spring constant in the horizontal elastic main axis direction of the divided mass can be adjusted.

According to a seventh aspect of the present invention, in the vibration reducing device according to the sixth aspect, the mounting direction of the variable rubber mount with respect to the divided mass can be changed and set for the divided sub-vibration system. It is characterized by providing a suitable adjusting means. In addition, as the adjusting means employed in this aspect, for example, a plurality of settable positions in the mounting direction of the rubber mount including positioning holes with bolts are provided on at least one side of the mass member and the building structure, It is possible to adopt a structure in which the mounting direction of the mount can be adjusted in multiple stages.Especially, when the mounting direction is set by rotation around a center axis extending in the vertical direction, the mass mount side of the rubber mount and the building It is also possible to adopt a structure in which a sliding plate or the like is provided at a mounting portion on the structure side so that the mounting direction of the rubber mount can be adjusted steplessly by rotation about a central axis.

In the seventh embodiment, it is not necessary to constitute the auxiliary vibration system spring member only with the variable rubber mount, and the variable rubber mount and the rubber mount which does not contribute to the adjustment of the spring constant of the auxiliary vibration system. May be combined to form a spring member. When a plurality of variable rubber mounts are used, it is not necessary to change the mounting directions of all the variable rubber mounts, and tuning can be performed by adjusting the mounting directions of only some of the variable rubber mounts. . Also, as described in the above-mentioned Japanese Patent Application Laid-Open No. 8-338467, the spring member can be constructed by stacking rubber mounts in multiple stages. In this case, the spring members are arranged at some stages. Only the provided rubber mount may be used as the variable rubber mount.

Further, as described above, in a variable rubber mount that adjusts the spring constant in the direction of the horizontal elastic main axis of the split sub-vibration system by changing the mounting direction with respect to the split mass about the center axis, for example, It is desirable to set the minimum value and the maximum value of the spring constant in the perpendicular direction to perpendicular directions perpendicular to each other. If a variable rubber mount having such a structure is employed, it is possible to easily and accurately know the spring constant in a specific direction according to the mounting angle of the variable rubber mount with respect to the divided mass around the central axis. Further, the tuning operation of the auxiliary vibration system by adjusting the mounting direction of the variable rubber mount is further facilitated.

Further, an eighth aspect of the present invention is the vibration reducing device according to the seventh aspect, wherein the adjusting means comprises an actuator means for changing a mounting direction of the variable rubber mount; Control means for controlling the operation of the actuator means to change the mounting direction of the variable rubber mount. In the vibration reducing device according to the eighth aspect, the tuning operation by changing the mounting direction of the variable rubber mount is further facilitated, and after the auxiliary vibration system is mounted on the building structure, the variable rubber mount is mounted. It is also easy to change the direction of attachment and tune or retune. In particular, if control means of a remote control structure that remotely controls the actuator means is adopted, the owner can easily perform tuning correction after the completion of the building structure or after the upper building of the house, etc.
For example, change the tuning according to the season, temperature, etc.
By performing the operation manually or automatically using a sensor or the like, it is possible to obtain a more advanced vibration damping effect.

A ninth aspect of the present invention is the vibration reducing device according to any one of the sixth to eighth aspects, wherein the divided sub-vibration system passes through the center of gravity of the divided mass in a horizontal direction. A plurality of the variable rubber mounts are disposed so as to be symmetrically positioned with respect to the two orthogonal symmetry axes extending in the direction of the arrow. It is characterized in that it is set to be symmetrical with respect to it. In such a vibration reduction device according to this aspect, in each of the divided sub-vibration systems, the spring constant of the entire spring member can be easily adjusted by changing the mounting direction of the plurality of variable rubber mounts, and the plurality of variable rubber mounts can be adjusted. Even when the mounting direction of the mount is changed or adjusted, the desired vibration damping effect can be stably obtained by maintaining the static and dynamic stability of the divided mass advantageously.

In the ninth aspect, it is desirable that the variable rubber mounts, which are symmetrically positioned with respect to each symmetry axis, have the same structure. On the other hand, between the variable rubber mounts that do not have a symmetric relationship with respect to any symmetry axis, the spring characteristics and the structures may be different from each other. In addition, setting the mounting direction of the variable rubber mount to be symmetrical with respect to the two symmetry axes may be performed, for example, with respect to any of the symmetry axes, by setting the variable rubber mounts disposed at symmetric positions on both sides thereof. Can be advantageously realized by arranging the inclination angles with respect to symmetrically the same.

[0024] In the ninth aspect, preferably, at least one, and more preferably, two orthogonal symmetry axes as symmetry axes of the arrangement positions of the variable rubber mounts in all the divided sub-vibration systems. Both of these two lines are set to be in the vibration direction in which vibration is to be prevented in the building structure. Further, in the ninth aspect, desirably, in all the divided sub-vibration systems, two orthogonal symmetry axes as the symmetry axes of the disposition positions of the variable rubber mounts are all in the divided sub-vibration system as a whole. Are set as elastic main axes in the horizontal direction. As a result, the stability of the divided sub-vibration system is further improved, and the intended vibration damping effect can be more stably obtained, and tuning of the divided sub-vibration system is facilitated.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 schematically shows a state in which a vibration reduction device 10 for a building structure having a structure according to the present invention is mounted on a general three-story house 12. The vibration reducing device 10 includes a plurality of independent divided masses 14 and a rubber mount 16 for elastically supporting the divided masses 14 independently of each other. With the mount 16,
By being elastically supported by the house 12, a plurality of divided sub-vibration systems 17 independent of each other are formed. In the present embodiment, as shown in the figure, all the divided sub-vibration systems 17 are mounted on the structural members 18 constituting the ceiling on the third floor of the three-story house 12.

More specifically, the divided masses 14 constituting each divided sub-vibration system 17 are formed of a material having a high specific gravity, such as metal, as shown by a virtual line in FIG. A material formed of a metallic or lead-based metal is suitably employed.
The shape of the division mass 14 is not particularly limited, but generally, a plate shape is preferably adopted, and more desirably, a rectangular plate shape, a polygonal plate shape, a circular plate shape, or the like, which is higher than the width dimension. A plate shape having a small dimension and a constant height, and having a plurality of symmetry axes in a plane is desirable. By employing the divided mass 14 having such a shape, the vibration reducing device 10 can be advantageously installed in a space such as the ceiling floor 20 on the top floor in a housed state, and the rubber mounts 16 can be displaced in the horizontal direction. It is possible to obtain a stable vibration-absorbing action by suppressing the angular displacement caused in the motor. In particular, in the present embodiment, the division mass 14 having a flat rectangular plate shape having a uniform height dimension over the entirety is employed.

The mass of the divided mass 14 is appropriately set in consideration of the mass, vibration state, structural strength, etc. of the house 12 as the main vibration system to be mounted. The total mass of the divided masses 14 is set so as to give an optimum mass according to the vibration of the house 12 to be damped. Specifically, for example, a house 1 as a main vibration system
Considering a two-degree-of-freedom system consisting of two and one sub-vibration system, calculating the resonance curve of the main vibration system from the equation of motion of this system to obtain the optimum mass in accordance with the optimum design method for general dynamic vibration absorbers Can be done. That is, based on the equation of motion of the two-degree-of-freedom system, the amplitude of the rubber mount 16 constituting the sub-vibration system (the main vibration system and the sub-vibration system) is set so that the amplitude of the main vibration system becomes equal to or less than the required value. By determining the mass ratio (μ) between the main vibration system and the sub-vibration system so that the absolute value of the relative displacement of the sub-vibration system is equal to or less than the allowable value, the optimum mass of the divided mass 14 in the sub-vibration system can be determined. . At this time, it is necessary to consider the load-bearing strength of the house 12, and due to the limitation due to the load-bearing strength of the house 12, the divided cell
4 may be determined. At that time,
Since the optimal mass of the divided masses 14 is given as the total mass of all the divided masses 14, the load of each divided mass 14 is divided and supported by different structural members, that is, a large number of By mounting the respective divided sub-vibration systems 17 on different structural members among the structural members and supporting each of the divided masses 14 with different structural members, the concentrated action of the load of the divided mass 14 is avoided, Divided mass 1 due to load bearing strength of house 12
It is also possible to relax the load limitation of No. 2. By the way, in the case of a two- or three-story house with a general lightweight steel frame or a wooden frame structure, the divided mass 1 in all divided sub-vibration systems
As a total mass of 4, a mass of about 100 to 1000 kg or more is set.

The masses of the plurality of divided masses 14 are set so as to give the optimum mass obtained in this way as a whole. The form of division into the plurality of divided masses 14 is not limited at all. For example, the number of divisions is determined by adjusting the tuning frequencies of the main vibration system and the divided sub-vibration system to be considered due to manufacturing errors and temperature changes. It can be set as appropriate according to the relative shift fluctuation width, the vibration mode (amplitude mode, resonance curve mode, etc.) of the main vibration system, the required degree of vibration reduction effect, and the like. In this case, the form of mass distribution to each of the divided masses 14 is not particularly limited. For example, the divided mass constituting the sub-vibration system having the tuning frequency closest to the vibration frequency to be statistically damped Set the largest mass for the mass, or set the mass stepwise so that the sub-vibration system that has the tuning frequency closest to the vibration frequency to be statistically damped has a larger mass Is also possible. In particular, in the present embodiment, a plurality of divided masses 14 having the same material and shape are employed in consideration of manufacturing easiness, cost, and the like.
The optimum mass is equally divided by each division mass 14.

Each of the divided masses 14 is elastically supported by a plurality of rubber mounts 16 with respect to the structural member 18 of the house 12, so that the number of the divided masses 14 is independent of each other. A split sub-vibration system 17 is configured. Here, in the plurality of divided sub-vibration systems 17, their natural frequencies are not the same as each other, and a plurality of types of natural frequencies are set. Note that there may be a divided sub-vibration system 17 having the same natural frequency, but preferably, different natural frequencies are set for all the divided sub-vibration systems 17.

The set value of the natural frequency in each divided sub-vibration system 17 is not particularly limited, and the tuning frequency of the main vibration system and the divided sub-vibration system to be considered due to a manufacturing error, a temperature change, or the like. Can be set as appropriate according to the relative deviation variation width of the vibration, the vibration mode (amplitude mode, resonance curve mode, etc.) of the main vibration system, the degree of required vibration reduction effect, and the like. On both the low frequency side and the high frequency side of the vibration frequency to be damped in the house 12 which is the main vibration system, the sub-vibration system 17 in which the natural frequency is set is set so as to exist, and 12
Is set such that the natural frequencies of all the divided sub-vibration systems 17 fall within the range of an appropriate peripheral frequency for the vibration frequency to be damped. With such a setting, the tuning deviation width between the main vibration system (house 12) and the divided sub-vibration system 17, which is expected under a normal environment in a general house, can be advantageously covered. Also, desirably, especially in a case where a vibration reduction effect of about 10 dB is aimed at in a general house, the difference between the natural frequencies of adjacent ones of the plurality of divided sub-vibration systems 17 is determined by the main vibration. 5 to 30%, more preferably 10 to 20% of the vibration frequency to be damped in the system (house 12)
Set to. Thus, an effective vibration reduction effect can be obtained more efficiently and effectively over a wide frequency range of the main vibration system. Note that the adjacent divided sub-vibration system 1
If the natural vibration frequency difference between 7 and 17 is too small, it becomes difficult to efficiently secure an effective vibration reduction effect over a wide tuning deviation width between the main vibration system and the sub vibration system. If the natural vibration frequency difference between the adjacent divided sub-vibration systems 17, 17 is too large, there is a possibility that an effective vibration reduction effect is difficult to be exhibited in an intermediate range between the natural vibration frequencies of the divided sub-vibration systems 17, 17. Because.

More specifically, for example, as a model of a general house, when the damping ratio of the main vibration system is 1% and the required vibration reduction effect is 10 dB or more, the mass ratio to the main vibration system is 2%. %, The split sub-vibration system 17 in which the loss coefficient of the spring portion is set to 0.1 is adopted, and the desired vibration reduction device 1 is used.
Consider getting 0. As a result, the split sub-vibration system 1
7, each divided sub-vibration system 17 as shown in Table 1 below.
It has been confirmed by calculation that setting the natural frequency of is effective. In this calculation, the equivalent mass of the main vibration system was 30,000 kg, and the total mass of the divided mass 14 of the divided sub-vibration system 17 was 600 kg.

FIG. 3 shows a simulation result of the vibration reduction effect of the vibration reduction device 10 constituted by the plurality of divided sub-vibration systems 17 having different natural frequencies. FIG. 3
Therefore, in the vibration reducing device 10 having the above-described structure, the intended vibration reducing effect can be effectively obtained over a sufficiently wide frequency range. Even if the natural frequency of the divided sub-vibration system 17 initially tuned to the vibration frequency to be damped in the house 12 due to a change or the like, the plurality of divided sub-vibration systems 17 Overall, houses 12
It is recognized that an effective vibration damping effect can be obtained. As shown in the figure, the tuning range of the natural frequency of the plurality of divided sub-vibration systems 17 can be generally set wider as the number of divided sub-vibration systems 17 is larger, but over a wider range. If this setting is made, there is a possibility that there may be a split sub-vibration system that does not effectively contribute to vibration isolation. Therefore, the tuning range of the split sub-vibration system depends on the vibration mode of the main vibration system and the required vibration suppression effect In consideration of the above, it is desirable to set a proper range, for example, in the case of a general house as described above, within a frequency range of 30% above and below the frequency of vibration to be damped in the house 12, respectively. .

In order to set a different natural frequency for each of the plurality of divided sub-vibration systems 17 in this manner, for example, the divided cells 14
Tuning can be performed by changing at least one of the mass of the rubber mount 16 and the spring constant of the rubber mount 16 in the vibration direction in which vibration is to be prevented. Here, in particular, in the present embodiment, as described above, the same divided mass 14 is employed in all the divided sub-vibration systems 17, and each divided sub-vibration system 17 has the same structure. A spring system is constituted by the plurality of rubber mounts 16, and the divided mass 14 is elastically supported.

Each of the rubber mounts 16 has an anisotropic spring constant in the horizontal direction, and differs depending on each direction around the mount center axis 38 extending in the vertical direction (each direction orthogonal to the center axis). Has spring properties. In each of the divided sub-vibration systems 17, it is possible to set the natural frequencies in the horizontal direction to different values by adopting the same rubber mount and changing the number of the mounted rubber mounts. In the embodiment, in any of the divided sub-vibration systems 17, the same number of rubber mounts 16 having the same structure constitute a spring system.

Here, the rubber mount 16
As shown in FIG. 4 and FIG. 5, a first mounting member 22 as a first mounting member and a second mounting member 24 as a second mounting member are opposed to each other while being separated from each other. The first mounting bracket 22 and the second mounting bracket 24 are elastically connected by a rubber elastic body 26 interposed between opposing surfaces of the two mounting brackets 22, 24. are doing. The first mounting member 22 has a block shape having an inverted triangular cross section, and a mounting bolt 28 protrudes from the center of the upper bottom surface 27. Also, the second mounting bracket 24
Has a rectangular flat plate shape, and both sides in the longitudinal direction sandwiching the flat plate portion 30 located at the center are raised obliquely to the first mounting bracket 22 side (upper side in FIG. 4), and the inclined plate portion is formed. 3
2, 32. Further, the center of the flat plate portion 30 of the second mounting bracket 24 is located below (the first mounting bracket 22).
(On the opposite side from the mounting bolt) is fixedly provided. Further, the respective inclined surfaces 36, 36 on both sides of the first mounting member 22 and the respective inclined plate portions 32, 32 on both sides of the second mounting member 24, on both sides of the mounting center axis 38, the center of the mounting is provided. In the direction inclined at substantially the same angle with respect to the shaft 38, they are opposed to each other with a substantially constant interval over the entire surface. And these inclined surfaces 36
Rubber blocks 40 and 4 having a pair of substantially rectangular block shapes interposed between the opposing surfaces of the
0, the first fitting 22 and the second fitting 24
Are elastically connected to each other. Further, in the present embodiment, a positioning piece 42 projecting outward from one side surface of the flat plate portion 30 is formed integrally with the second mounting member 24. The positioning piece 42 has a bolt insertion hole 44 for fixing the position.

That is, the rubber mount 16 of the present embodiment
In FIG. 4, since the elastic main axes of the two independent rubber blocks 40 and 40 are inclined with respect to each other, a vertical elastic main axis extending along the mount center axis 38 and a direction perpendicular to the plane of FIG. And a horizontal second elastic main shaft extending in the horizontal direction in the figure. In the rubber mount 16 having such a structure, in the direction of the first elastic main shaft in the horizontal direction, the main deformation of the rubber elastic body 26 at the time of load input is sheared, and the spring constant in the horizontal direction is minimized. on the other hand,
In the direction of the second elastic main axis in the horizontal direction, the main deformation of the rubber elastic body 26 at the time of load input becomes compression / tensile,
The spring constant in the horizontal direction is maximized. This allows
In the rubber mount 16, the minimum value and the maximum value of the spring constant in the horizontal direction are set in directions orthogonal to each other. In the following description, the horizontal direction in which the spring constant is the minimum value (the direction perpendicular to the paper surface in FIG. 4) is referred to as a horizontal reference direction in the rubber mount 16.

The rubber mount 16 has a first mounting member 22 fixed to the divided mass 14. In addition, the first mounting bracket 22 has the mounting bolt 2
8 may be directly screwed and fixed to the divided mass 14, but, for example, a bearing mechanism, a sliding contact plate mechanism, or the like may be used so that the mounting direction of the first mounting member 22 to the divided mass 14 can be easily changed. The first mounting bracket 22 may be attached to the divided mass 14 via the. In this embodiment, as shown in FIG. 2, four rubber mounts 1 are provided.
6 are attached to the four corner portions of the rectangular plate-shaped divided mass 14, respectively. On the other hand, as shown in FIG. 1, the second mounting bracket 24 of the rubber mount 16 is attached to the three-story
As in the case of the first mounting bracket 22, it is mounted directly or via a bearing mechanism, a sliding contact plate mechanism, or the like, to the structural member 18 on the ceiling on the top floor of the second floor. As a result, the divided mass 14 is elastically attached to the structural member 18 of the three-story house 12 via the four rubber mounts 16. One vibration system having four rubber mounts 16 as spring members is constituted, and this vibration system is used as a divided sub-vibration system 17 which functions as one sub-vibration system for the main vibration system including the three-story house 12. Further, a plurality of such divided sub-vibration systems 17 are attached to the house 12 in parallel and independently of each other, whereby the vibration reduction device 10 is configured.

When the vibration reducing device 10 is mounted, the divided masses 14 are supported in a state of being spread in the horizontal direction in any of the divided sub-vibration systems 17 and the rubber mounts 16 Also, it is arranged with its mount central axis extending in the vertical direction.

Further, as shown in FIG. 6, the structural members 18 of the three-story house 12 to which the rubber mounts 16 constituting the respective divided sub-vibration systems 17 are attached are provided. A bolt hole 46 is provided for a mounting portion of the second mounting bracket 24. The positioning bolts 48 inserted into the positioning pieces 42 of the second mounting bracket 24 are screwed into the bolt holes 46 so that the mounting direction of the rubber mount 16 with respect to the structural member 18 and the split mass 14 (mount center (Circumferential position around the axis 38) is fixedly determined. Here, the bolt hole 46 is provided in the mount center shaft 3.
8 at substantially equal intervals (in this embodiment, approximately 90
5) over the range of degrees. This allows
By rotating the rubber mount 16 around the mount center axis 38, the positioning bolt 48 inserted through the positioning piece 42
Is screwed into any one of the bolt holes 46 so that the mounting direction of the rubber mount 16 can be arbitrarily changed and set at an interval of about 22.5 degrees.

In short, in this embodiment, the positioning piece 42 provided on the second mounting bracket 24, the plurality of bolt holes 46 provided on the structural member 18, and any of the bolt holes 46 are screwed. Adjustment means for changing and setting the mounting direction of the rubber mount 16 with respect to the dividing mass 14 and the structural member 18 is provided including the positioning bolts 48 for positioning and fixing the positioning piece 42 to the structural member 18. It should be noted that a similar adjusting means may be provided between the first mounting member 22 and the divided mass 14 in addition to or instead of between the second mounting member 24 and the divided mass 14.

Further, the four rubber mounts 16 in each of the divided sub-vibration systems 17 sandwich two symmetry axes X and Y extending in the horizontal direction perpendicular to each other in the divided mass 14.
They are arranged so that they are symmetrically located. In this embodiment, two symmetry axes X,
Each of Y is an inertia main axis extending in the horizontal direction of the divided mass 14. In the elastic support system including the divided mass 14 and the four rubber mounts 16, an elastic main shaft extending in the vertical direction is set to pass through the center of gravity of the divided mass 14. Specifically, in FIG. 2, the first rubber mount 16a and the second rubber mount 16b, and the third rubber mount 16c and the fourth rubber mount 16d
First symmetry axis: the first rubber mount 16a and the third rubber mount 16c, and the second rubber mount 16b and the fourth rubber mount 16d are symmetrically positioned with respect to X, Axis: Positioned symmetrically with respect to Y.

The four rubber mounts 16a to 16a
d is set so that its mounting direction is also symmetric with respect to the two symmetry axes X and Y of the divided mass 14. Specifically, in FIG. 2, with respect to the first symmetry axis: X, the intersection angle between the horizontal reference direction line 50a of the first rubber mount 16a: θxa and the intersection angle of the horizontal reference direction line 50b of the second rubber mount 16b. : Θxb is the same, and the intersection angle between the horizontal reference direction line 50c of the third rubber mount 16c: θxc and the intersection angle of the horizontal reference direction line 50d of the second rubber mount 16d: θxd is set to be the same. I have. As for the second axis of symmetry: Y, the intersection angle θya of the horizontal reference direction line 50a of the first rubber mount 16a and the intersection angle θyc of the horizontal reference direction line 50c of the third rubber mount 16c are the same. , The second rubber mount 16
The intersection angle θyb of the horizontal reference direction line 50b of FIG. b and the intersection angle θyd of the horizontal reference direction line 50d of the second rubber mount 16d are set to be the same.

As described above, the four rubber mounts 16a-d
When the mounting direction of the rubber mounts 16a to 16d is changed by setting and maintaining the mounting direction of the split sub-vibration system constituted by the split mass 14 and the four rubber mounts 16a to 16d. The direction of the elastic main axis in the horizontal direction as a whole is maintained in the direction of the first symmetry axis: X and the direction of the second symmetry axis: Y in the divided mass 14. And these first symmetry axes: X
And the direction of the second symmetry axis: Y are respectively the main vibration directions to be damped in the house 12 having the vibration damping symmetry, for example, each side in the case of a house having a flat rectangular frame structure. The installation direction of the vibration reduction device 10 with respect to the house 12 is set so as to be in a direction parallel to. This allows
With respect to each of the divided sub-vibration systems 17 constituting the vibration reduction device 10, vibration in two directions to be damped is input in the elastic main axis direction of the divided sub-vibration system 17,
For each of the vibrations input in these two directions, an effective vibration damping effect can be exhibited.

In each of the divided sub-vibration systems 17, as described above, the rubber mounts 16a to 16d having the anisotropic horizontal spring constant are used as the spring members. By changing the mounting directions of 16a to 16d, two main elastic axis directions (first symmetric axis: X direction and second symmetric axis: Y direction) which are input directions of vibration to be damped are provided. The spring constant is
It has been changed. Specifically, in the present embodiment, as the value of the intersection angle θx of the rubber mounts 16a to 16d with respect to the first symmetry axis X decreases, the direction of the first symmetry axis X in the divided sub-vibration system 17 decreases. Is changed to a direction in which the spring constant in the direction of the second symmetry axis: Y increases. As a result, each rubber mount 1
6a to 6d, the natural frequency in the direction of the first symmetry axis: X in the divided sub-vibration system 17 is reduced to the low frequency side by reducing the value of the intersection angle θx with respect to X. Two symmetry axes: the natural frequency in the direction of Y can be shifted to the high frequency side, respectively.
By increasing the value of the intersection angle θx with respect to the first symmetry axis X of 6a to 6d, the natural frequency in the direction of the first symmetry axis X in the divided sub-vibration system 17 is shifted to the high frequency side and to the second frequency. Symmetry axis: the natural frequency in the direction of Y can be shifted to the lower frequency side. As is apparent from this, in the present embodiment, each rubber mount 16 is a variable rubber mount.

Therefore, in the vibration reduction device 10 having the plurality of divided sub-vibration systems 17 having the above-described structure,
In all of the divided sub-vibration systems 17, the same one of the divided mass 14 and the rubber mount 16 is adopted, and the mounting direction (installation direction) of the rubber mount 16 is simply changed between the divided sub-vibration systems 17. Only by changing, the natural frequencies in the plurality of divided sub-vibration systems 17 can be set to different values by shifting each other.

Further, the natural frequency of each divided sub-vibration system 17 is also problematic by appropriately setting the mounting direction of each rubber mount 16 in consideration of the type and environment of the house 12 to which it is mounted. The tuning frequency can also be adjusted appropriately according to the vibration that is occurring. As a result, the effective vibration damping effect can be easily and accurately obtained.
Moreover, it can be obtained at low cost. In particular, in the present embodiment, the spring member for elastically supporting the divided mass 14 is constituted only by the anisotropic rubber mount 16 and the mounting directions of all the rubber mounts 16 are changed in conjunction with each other. Therefore, there is also an advantage that the tuning width of the natural frequency of the divided sub-vibration system 17 by changing the mounting direction of the rubber mount 16 can be ensured to be larger.

As described above, one rubber mount 1
6, the range of the natural frequency of the vibration reducing device 10 that can be adjusted by changing the mounting direction is limited by the spring characteristics of the rubber mount 16 used. Therefore, in each divided sub-vibration system 17,
In order to obtain a greater degree of tuning freedom,
A plurality of types of rubber mounts 16 having different spring characteristics are prepared in advance, and the rubber mount 1 having appropriate spring characteristics is selected therefrom, for example, in consideration of the structure of the house 12 or the like.
6 for each divided sub-vibration system 17 or vibration reduction device 10
It is desirable to select and adopt it appropriately for each case. By selecting the optimum value by combining the selection of the spring characteristic of the rubber mount 16 itself and the adjustment of the mounting direction of the rubber mount 16 with each other, the natural frequency of each divided sub-vibration system 17 can be set in an extremely wide range. Therefore, it is possible to efficiently provide the vibration reduction device 10 that can exert an effective vibration damping effect on various types of building structures.

Incidentally, the split sub-vibration system 1 having the structure as described above
7, a square square having a mass of 400 kg is adopted as the dividing mass 14, and the rubber mount 16 has a spring constant KI in a first elastic main axis direction (a direction perpendicular to the plane of FIG. 4). , 18000N / m, 2
2000N / m, 26000N / m, 30000N /
m, 34000 N / m, 38000 N / m, 42000
In the case where seven types N / m can be selected,
Tuning frequency realized by changing the mounting direction of each rubber mount 16 (first frequency of symmetry in divided sub-vibration system 17: natural frequency in direction of X and second frequency of symmetry: direction of Y FIG. 7 shows the result of simulating the natural frequency. In this simulation, each of the rubber mounts 16 has a spring constant: KI in a first elastic main axis direction (a direction perpendicular to the paper surface of FIG. 4) and a second elastic main axis direction (left-right direction in FIG. 4). ) Spring constant: KII set so as to satisfy the following equation was adopted. Further, regarding the mounting direction of each rubber mount 16, the first symmetry axis: the intersection angle with respect to X: θx (FIG. 2)
Was changed in the range of 0 to 90 degrees. KI: KII = 1: 3

As is clear from the results shown in FIG.
By preparing seven types of rubber mounts 16 and selectively adopting them, and by appropriately adjusting the mounting direction of the selected rubber mounts 16, the natural frequency of the divided sub-vibration system 17 can be adjusted to a value of 2 to 2 in general. Problems with three-story houses and cheap 3
It is possible to set the tuning with sufficiently fine tuning accuracy over substantially the entire wide range of up to 5 Hz and its peripheral frequency.

The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention is not limited at all by the specific description in the embodiment.

For example, the number and arrangement of the rubber mounts are not limited at all, and some of the rubber mounts may have a constant spring constant in the horizontal direction.

Further, as shown in the example, the specific structure of the anisotropic rubber mount in which the spring characteristic in the horizontal direction changes by changing the mounting direction about the vertical axis is not limited at all. For reference, another specific example of the anisotropic rubber mount that can be employed in the present invention is shown in FIGS.
Shown in In the rubber mount 60 shown in FIG. 8, the first mounting bracket 62 mounted on the divided mass side is obliquely downward on both sides in the longitudinal direction of the flat central portion 66 on which the mounting bolt 64 is erected. Extending inclined plate portion 68,
68 has a bent plate shape integrally formed, while a second mounting bracket 70 is mounted on the structural member side of the house.
Is a central portion 7 bent in a chevron and projected upward.
2 is a flat mounting plate 7 having bolt holes 74 on both sides.
6, 76 are formed in a bent plate shape integrally formed. The inclined plate portions 68, 68 of the first mounting member 62 are spaced apart and opposed to both side inclined surfaces 78, 78 of the central portion 72 of the second mounting member 70, respectively. A pair of rubber blocks 80, 80 as a rubber elastic body are interposed between the opposing surfaces of the rubber blocks. In the rubber mount 60 having such a structure, similarly to the rubber mount (16) according to the embodiment, the spring in the horizontal direction in the direction of the first elastic main shaft extending in the direction perpendicular to the paper surface in FIG. While the constant is minimized, the spring constant in the horizontal direction is maximized in the direction of the second elastic main shaft extending in the horizontal direction in the figure in the horizontal direction. Therefore, such a rubber mount 60 can also be advantageously employed in the embodiment.

The rubber mount 82 shown in FIGS. 9 to 10 has a first mounting member 8 mounted on the divided mass side.
4 has a substantially inverted truncated cone shape, while the second mounting bracket 86 mounted on the structural member side of the house has a large-diameter cylindrical shape. The second mounting bracket 86 is located at a position vertically separated from the center axis of the first mounting bracket 84.
Is provided, and between the outer peripheral surface of the first mounting member 84 and the inner peripheral surface of the second mounting member 86 in the radial direction, a tapered tapered center portion is projected upward. A rubber elastic body 84 having a thick annular plate shape is interposed,
The inner peripheral surface of the rubber elastic body 84 is vulcanized and bonded to the outer peripheral surface of the first mounting bracket 84, and the outer peripheral surface of the rubber elastic body 84 is vulcanized and bonded to the inner peripheral surface of the second mounting bracket 86. Have been. The rubber elastic body 84 has a first mounting bracket 8 attached thereto.
A pair of slits 88, 88 penetrating in the axial direction, respectively, are formed on both side portions sandwiching 4 in one radial direction. In the rubber mount 82 having such a structure, similarly to the rubber mount (16) according to the embodiment, FIG.
The spring constant in the horizontal direction in the vertical direction in FIG. 10 is minimum, while the spring constant in the horizontal direction in the horizontal direction in FIG. Therefore, such a rubber mount 82
May also be advantageously employed in the embodiment.

In the rubber mount 90 shown in FIGS. 11 to 12, the first mounting bracket 92 mounted on the divided mass side has a large-diameter cylindrical shape, and is mounted on the structural member side of the house. The second mounting member 94 has a small-diameter cylindrical shape. The first mounting member 92 is disposed radially outward of the second mounting member 94 and eccentric in the vertical direction (vertical direction in FIGS. 11 and 12). The second mounting bracket 94 has flat plate-shaped retainers 96, 9 protruding on both sides in the horizontal direction on the outer peripheral surface.
6 is fixed. And these first mounting brackets 9
A rubber elastic body 98 having a substantially thick disk shape as a whole is interposed between the radially opposed surfaces of the second and second mounting brackets 94, and the outer peripheral surface of the rubber elastic body 98 is the first elastic body 98. Mounting bracket 9
2 is vulcanized and adhered to the inner peripheral surface of the rubber elastic body 9.
8 is vulcanized and bonded to the outer peripheral surface of the second mounting bracket 94. Further, a pair of slits 100 and 102 penetrating in the axial direction are formed on both sides of the rubber elastic body 98 sandwiching the second mounting member 94 in the vertical direction. Is reduced. In the situation where no external force is shown, the upper slit 100 is largely open and the lower slit 102 is crushed up and down. ,
With the elastic deformation of the rubber elastic body 98, the upper and lower slits 1
00 and 102 have substantially the same size. In the rubber mount 90 having such a structure, similarly to the rubber mount (16) according to the embodiment, FIG.
The spring constant in the horizontal direction in the left-right direction (mount axis direction) of FIG. 2 is minimum, while the spring constant in the horizontal direction is maximum in the left-right direction (direction perpendicular to the mount axis) in FIG. Therefore, such a rubber mount 90 can also be advantageously employed in the embodiment.

Each of the rubber mounts 106 shown in FIGS. 13 and 14 has a rectangular flat plate shape, and has a first mounting member 108 and a second mounting member 110 which are spaced apart and opposed to each other. In addition, a rubber elastic body 112 having a rectangular block shape is interposed between opposing surfaces of the first mounting member 108 and the second mounting member 110. And
The first mounting bracket 1 is attached to the upper and lower end surfaces of the rubber elastic body 112.
08 and the second mounting member 110 are respectively vulcanized and adhered, so that the first mounting member 108 and the second mounting member 1
10 are elastically connected by a main rubber elastic body 112. In addition, mounting bolts 114 and 116 protruding vertically and outwardly from the respective central portions are fixed to the first mounting bracket 108 and the second mounting bracket 110. First mounting bracket 1
08 is attached to the mass body side, and the second mounting bracket 110 is attached to the structural member side of the house. The rubber mount 106 is mounted so that the center axis of the rubber mount extends in a substantially vertical direction. Under the mounted state, the first mounting bracket 108 and the second mounting bracket 110 are opposed to each other in a substantially vertical direction. Can be Here, as shown in FIG. 14, the main rubber elastic body 112 has a side length: a
Has a long rectangular shape consisting of the long side of the short side and the side length of b. By adopting the main rubber elastic body 112 having two adjacent sides having different lengths as described above, the rubber mount 106 of the present embodiment also deforms against bending deformation generated in the main rubber elastic body 112 during shear deformation. Due to the difference in easiness, the spring constant in the horizontal direction in the vertical direction in FIG. 14 (the direction in which the pair of long sides of the main rubber elastic body 112 face each other) is minimized, while the horizontal direction in FIG. The spring constant in the horizontal direction becomes the maximum in the direction in which the pair of short sides oppose each other at 112). Therefore, such a rubber mount 106 has the same characteristics as the rubber mount 106 of the above embodiment, and can be advantageously employed in the above embodiment.

Further, in the present invention, in addition to the anisotropic rubber mount as described above, a rubber mount in which a spring constant in a direction perpendicular to an axis perpendicular to the center axis of the mount is substantially constant in any direction is employed. Is also possible. For example, FIG.
As shown in 5 to 16, each of the first mounting bracket 120 and the second mounting bracket 122, each having a disk shape and axially separated from each other and facing each other, is placed between their facing surfaces. Rubber mount 126 having a structure elastically connected by a circular block-shaped rubber elastic body 124 interposed therebetween.
It is also possible to employ. The rubber mount 126 is configured such that the first mounting shaft 128 projecting outward (upward) in the axial direction from the first mounting bracket 120 is attached to the mass body 1.
4 and is attached to the second mounting bracket 1 so as to be swingable about a rotation shaft 130 extending in the horizontal direction.
The second mounting shaft 132 protruding outward (downward) in the axial direction from the base 22 is rotated by the bracket 134 fixedly mounted on the structural member 18 of the house.
The bolt is fixed in an arbitrary rotation state around 30 turns. In short, the bracket 134 has a plurality of positioning holes 13 on an arc centered on the rotation shaft 130.
6 through which the rubber mount 126 is fixed by a fixing bolt 138 inserted into one of the positioning holes 136.
The second mounting shaft 132 is fixedly supported. Then, the bracket 1 of the second mounting shaft 132
By adjusting the bolt fixing position with respect to 34,
The inclination angle α of the center axis 140 of the rubber mount 126 for elastically supporting the mass body 14 with respect to the structural member 18 with respect to the vertical line can be changed and set. In other words, the mounting direction of the rubber mount 126 can be adjusted around the rotation shaft 130 in one vertical plane.

That is, in the rubber mount 126 having such a structure, the horizontal spring constant in the auxiliary vibration system can be changed by changing the inclination angle α as the mounting direction. The smaller the value of α is, the closer the center axis of the rubber mount 126 is to the vertical direction, the more the deformation of the rubber elastic body 124 at the time of horizontal displacement of the mass body 14 becomes mainly shearing deformation, While the spring constant in the direction is reduced, the larger the value of α and the closer the central axis of the rubber mount 126 is to the horizontal direction, the more compression / tensile deformation of the rubber elastic body 124 occurs when the mass body 14 is displaced in the horizontal direction. Due to deformation, the spring constant in the horizontal direction is increased. Therefore, such a rubber mount 126 can also be advantageously employed as a rubber mount for elastically supporting the divided mass 14 in the above embodiment.

The rubber mount 126 as described above is
Even when the mounting direction is changed, it is desirable that the horizontal elastic main shaft in the sub-vibration system be kept constant. For this purpose, a plurality of rubber mounts 126 are desirably formed by elastic main axes X and Y as two orthogonal symmetry axes extending in the horizontal direction through the center of gravity O of the mass body 14.
Are arranged so as to be symmetrical with respect to each other, and their mounting directions in the rubber mount 126 are
These two elastic main axes are set so as to be symmetrical with respect to X and Y.

More specifically, for example, as shown in FIG. 16, the inclination angle of the center axis of the mount can be changed and adjusted on a vertical plane parallel to the vertical plane including the X axis.
A pair of rubber mounts 126a to 126d and two pairs of rubber mounts 126e to 126h in which the inclination angle of the center axis of the mount can be changed and adjusted on a vertical plane parallel to the vertical plane including the Y axis are provided. By setting the inclination angles of the paired rubber mounts 126a to 126d to be the same as each other, and setting the inclination angles of the other paired rubber mounts 126e to 126h to be the same, the horizontal elastic main shaft in the sub-vibration system is set. Is maintained constant, and the spring constant in each elastic main axis direction in the horizontal direction can be advantageously changed and adjusted. In particular, if the mount arrangement shown in FIG. 16 is adopted, one elastic main axis: the spring constant in the X direction and the other elastic main axis: the spring constant in the Y direction can be set independently of each other. There are advantages.

Alternatively, as shown in FIG. 17, two elastic principal axes: X,
A total of four rubber mounts 126a to 126d are disposed so as to be symmetrical with respect to Y, and the mounting directions of the rubber mounts 126a to 126d with respect to the mass body 14 are changed by two elastic main axes: X,
By adjusting both the vertical and horizontal directions while maintaining the symmetry of the tilt angle with respect to Y, both elastic main axes:
It is also possible to simultaneously set the spring constants in the X and Y directions.

Further, even when the arrangement of the rubber mounts 126a to 126d shown in FIG. 17 is adopted, the rubber mounts 126a to 126d are not rotated in the Y direction (the inclination angle is set in the horizontal direction). By changing the inclination angle of the center axis of the mount only on the vertical plane including the X-axis (without changing), the spring constant ratio in the two horizontal directions (X-axis direction and Y-axis direction) in the sub-vibration system can be changed. It is possible to change and tune the frequency ratio. In FIG. 15, when the inclination angle (α) of the rubber mount 126 is changed in the vertical plane, the change in the spring constant is large in the left-right direction on the paper surface, and is large in the direction perpendicular to the paper surface.
Since the elastic deformation of the rubber elastic body 124 is mainly shear deformation and is smaller than the direction perpendicular to the paper surface, the inclination angle (α) of the rubber mount 126 is changed only in the vertical plane. By increasing the ratio, it is possible to increase the spring constant ratio in two horizontal directions (X-axis direction and Y-axis direction) in the sub-vibration system.

Further, in each of the divided sub-vibration systems 17, an attenuator capable of exerting a damping force when the divided mass 14 is displaced with respect to the structural member 18 can be adopted as required.

Further, the arrangement position of the vibration reduction device 10 can be appropriately changed in consideration of the structure of the building structure, the vibration mode, etc. other than the ceiling portion on the top floor as shown in the example, the underfloor portion and the like. . Furthermore, each of the divided sub-vibration systems 17 constituting the vibration reduction device 10 can be installed at different locations.

In addition, the present invention is not limited to three-story houses as shown in the examples, but also includes one-story, two-story, or four-story or more houses, or various building structures such as warehouses, buildings, and towers. It is needless to say that any of them can be applied to the vibration reduction device for use.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0067]

As is apparent from the above description, according to the present invention, the initial tuning frequency in the sub-vibration system should be reduced to prevent vibration of the building structure as the main vibration system due to temperature change and the like. Even when the vibration frequency deviates, an effective vibration reduction effect can be stably obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state in which a vibration reduction device as one embodiment of the present invention is mounted on a building structure (house).

FIG. 2 is a schematic plan view showing one divided sub-vibration system constituting the vibration reduction device shown in FIG. 1;

FIG. 3 is a graph showing a result obtained by simulation of an anti-vibration effect of a vibration reduction device having a structure according to the present invention.

FIG. 4 is a front view showing a rubber mount employed in the vibration reduction device shown in FIG.

FIG. 5 is a perspective view of the rubber mount shown in FIG. 4;

FIG. 6 is a plan view for explaining a structure of a mounting portion for a structural member of a rubber mount in the vibration reduction device shown in FIG. 1;

FIG. 7 is a graph showing a tuning characteristic of a natural frequency in the divided sub-vibration system shown in FIG.

FIG. 8 is a front view showing another example of the structure of the rubber mount that can be employed in the vibration reducing device shown in FIG. 1;

9 is a longitudinal sectional view showing still another example of the structure of the rubber mount that can be employed in the vibration reduction device shown in FIG.

FIG. 10 is a plan view of the rubber mount shown in FIG. 8;

FIG. 11 is a front view showing still another example of the structure of the rubber mount that can be employed in the vibration reduction device shown in FIG. 1;

FIG. 12 is a longitudinal sectional view of the rubber mount shown in FIG.

FIG. 13 is a perspective view showing still another structural example of a rubber mount that can be employed in the vibration reduction device shown in FIG.

FIG. 14 is a cross-sectional view of the rubber mount shown in FIG.

FIG. 15 is a front view showing still another example of the structure of the rubber mount that can be employed in the vibration reduction device shown in FIG. 1 when the rubber mount is mounted on a sub-vibration system.

FIG. 16 is a schematic plan view showing a specific example of a split sub-vibration system configured by employing the rubber mount shown in FIG.

FIG. 17 is a schematic plan view showing another specific example of the divided sub-vibration system configured by employing the rubber mount shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration reduction device 12 House 14 Split mass 16 Rubber mount 18 Structural member 42 Positioning piece 46 Bolt hole 48 Positioning bolt

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takashi Uchiyama Komaki City, Aichi Pref.

Claims (7)

[Claims] 1. A vibration reduction device comprising a sub-vibration system, wherein a mass member is elastically supported by a plurality of rubber mounts on a building structure to be subjected to vibration isolation. And the total mass of all the divided masses is set to an optimum mass according to the vibration of the building structure to be damped, and each of the divided masses is mutually attached to the building structure by the rubber mount. A vibration reducing device for a building structure, wherein a plurality of divided sub-vibration systems are independently elastically supported and different natural frequencies are set for the divided sub-vibration systems. 2. The method according to claim 1, wherein at least one of the divided masses constituting the plurality of divided sub-vibration systems has a mass different from that of the other divided masses, and a natural frequency closest to a vibration frequency of the building structure to be damped. The vibration reducing device for a building structure according to claim 1, wherein a divided mass having the largest mass is employed in the divided sub-vibration system set to the frequency. 3. The vibration reducing device for a building structure according to claim 1, wherein each of the divided sub-vibration systems is supported on a ceiling portion of a top floor of a general house and accommodated in an attic. 4. The vibration for a building structure according to claim 1, wherein at least one of said plurality of divided sub-vibration systems is supported by a structural member different from other divided sub-vibration systems. Reduction device. 5. A rubber mount in the auxiliary vibration system,
Each of the divided sub-vibration systems includes a variable rubber mount that can adjust a spring constant in a horizontal elastic main axis direction in the divided sub-vibration system by changing a mounting direction with respect to the divided mass. The building structure according to any one of claims 1 to 4, wherein a different natural frequency is set for each of the divided sub-vibration systems by changing a mounting direction of the variable rubber mount with respect to the divided mass. Vibration reduction device. 6. The vibration reducing device for a building structure according to claim 5, wherein the split sub-vibration system is provided with adjusting means capable of changing and setting a mounting direction of the variable rubber mount with respect to the split mass. 7. In the split sub-vibration system, a plurality of the variable rubber mounts are arranged so as to be symmetrically positioned with respect to two orthogonal symmetry axes extending in the horizontal direction through the center of gravity of the split mass. The vibration reduction device for a building structure according to claim 5, wherein the vibration reducing device is arranged so that the mounting directions of the variable rubber mounts are symmetric with respect to the two symmetric axes.