JP4232811B2 - Vibration reduction device for building structures - Google Patents

Description

  The present invention relates to a vibration reducing device that constitutes a secondary vibration system for a building structure such as a house and can exhibit a dynamic vibration absorption effect for a building structure that is a main vibration system.

  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 excitation force. In particular, in recent years, ordinary houses are also increasing in number of two-story and three-story buildings, and in those houses, slight vibration caused by traffic vibration has become a problem as a cause of unpleasant noise, unpleasant vibration at bedtime, for example. It is coming.

  By the way, several damper apparatuses for reducing vibration of high-rise buildings such as high-rise buildings and towers have been proposed as vibration reduction apparatuses for building structures. For example, Japanese Patent Application Laid-Open No. 3-74649 and Japanese Patent Application Laid-Open No. 8-338467 disclose a damper device having a structure in which an additional mass is elastically supported by a multistage laminated rubber with respect to a building structure. These damper devices are configured to exhibit a reduction effect with respect to horizontal vibrations induced in the building structure by constituting one sub vibration system in the horizontal direction.

  However, in these conventional damper devices, if there is a deviation between the natural frequency set for the secondary vibration system and the vibration to be isolated in the building structure as the main vibration system, an effective vibration reduction effect is obtained. There was a problem that it could not be demonstrated. In particular, when the spring member of the damper device is formed of a rubber elastic body, since the spring constant has temperature dependence, it is difficult to stably obtain an effective vibration damping effect. Attempting to place and arrange the attic temperature changes between several tens of degrees below zero and 60-70 ° C, so even if tuning at a reference temperature (for example, 20 ° C), the desired damping effect is stabilized. I couldn't have hoped to get it.

  Japanese Patent Laid-Open No. 5-149026 discloses a sloshing provided with a sub-vibration system having a different natural frequency in addition to a sub-vibration system tuned to the same natural frequency as the vibration frequency to be isolated. A vibration suppressing device such as a damper is disclosed. However, the vibration suppression device disclosed in this publication only considers vibration isolation of large structures such as high-rise buildings, and has a structure in which a mass member is elastically supported by a rubber mount installed in a general house or the like. The reduction device could not always be effectively applied. Specifically, for example, in the vibration suppression device described in this publication, it is inevitable that the total weight of the entire device becomes large because a plurality of sub-vibration systems are installed. In some cases, it was difficult to adopt due to insufficient strength of the building structure itself.

Japanese Patent Laid-Open No. 3-74649 JP-A-8-338467 Japanese Patent Laid-Open No. 5-149026

  Here, the present invention has been made in the background as described above, and the problem to be solved is a building structure even when there is a deviation in tuning frequency (tuning) due to a temperature change or the like. It is an object of the present invention to provide a vibration reducing device having a novel structure capable of stably exhibiting a good damping effect against vibration to be vibrated.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, each aspect described below can be employed in any combination. In addition, it should be understood that the aspects and technical features of the present invention are not limited to those described below, but are recognized based on the description of the entire specification and the inventive concept described in the drawings. is there.

  According to a first aspect of the present invention, in the vibration reducing device that constitutes the secondary vibration system by elastically supporting the mass member with a plurality of rubber mounts for the building structure to be damped, the mass member is It is constituted by a plurality of divided masses, and the total mass of the divided masses is set to an optimum mass corresponding to the vibration to be damped of the building structure, and each of the divided masses is formed by the rubber mount in the building structure. A plurality of divided sub-vibration systems are configured to be elastically supported independently from each other, and different natural frequencies are set for the divided sub-vibration systems. Are set so that they are located on both the low-frequency side and the high-frequency side of the vibration frequency of the building structure obtained under the standard condition, which is to be damped. Split The tuning range of the natural frequency of the vibration system is set so as to be within a frequency range of 30% above and below the vibration frequency of the building structure to be isolated, and the natural frequencies are adjacent to each other. The characteristic frequency difference between objects is set to be different in each of the divided sub-vibration systems in the vibration reducing apparatus.

  In such a vibration reduction device according to the first aspect, since the plurality of natural frequencies are set by the plurality of divided sub-vibration systems, the sub-vibration system is not accurately tuned to the vibration to be isolated. Even when there is a tuning shift due to a temperature change or the like, a good vibration damping effect as a whole can be exhibited. Moreover, in such a vibration reducing device, since the optimum mass is divided and a plurality of divided sub-vibration systems are configured, an increase in the weight of the entire device can be advantageously avoided, and the building structure can be avoided. It can be advantageously installed. In addition, since each divided mass is elastically supported by the rubber mount, it can be installed independently at any location, and a large degree of freedom can be secured with respect to setting the mounting location for the building structure. Therefore, such a vibration reducing device can be advantageously employed in, for example, ordinary houses, and can provide a stable vibration-proofing effect even when exposed to a large temperature change.

  The optimum mass of the mass member composed of a plurality of divided masses is, for example, the amplitude of the main vibration system and the sub vibration system in the simultaneous equations of the equation of motion of the building structure as the main vibration system and the divided sub vibration system as the sub vibration system. By giving the condition that the amplitude (absolute value of the relative displacement of the main vibration system and the sub vibration system) of the rubber mount that constitutes each is below the required value, the mass ratio to the equivalent mass of the main vibration system In this case, the load bearing strength of the building structure should be taken into consideration.

  Further, according to a second aspect of the present invention, in the vibration reducing apparatus according to the first aspect, the building structure obtained by determining each natural frequency of the plurality of divided sub-vibration systems under a reference condition. It is characterized in that it is set so as to be located on both the low frequency side and the high frequency side of the vibration frequency to be damped. This makes it possible to obtain an effective vibration reducing 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, the condition that occurs most frequently.

  In addition, according to a third aspect of the present invention, in the vibration reducing apparatus according to the first or second aspect, at least one of the divided masses constituting the plurality of divided sub-vibration systems is defined as another divided mass. In the divided sub-vibration system set to have a different mass and the natural frequency closest to the vibration frequency of the building structure to be damped, a divided mass having the largest mass is employed. In such a vibration reduction device according to this aspect, the split sub-vibration system having the largest divided mass is substantially tuned to the vibration to be isolated in the main vibration system and appears at the highest frequency. Below, the vibration suppression effect by the divided sub-vibration system having the largest divided mass is more effectively exhibited. In other words, if the vibration suppression effect over a long period of time in a large number of vibration reduction devices taking into account tuning errors, temperature changes, etc. is grasped in total, the adoption of the structure according to this aspect can improve the vibration suppression effect. is there.

  According to a fourth aspect of the present invention, in the vibration reducing apparatus according to any one of the first to third aspects, each of the divided sub-vibration systems is supported on a ceiling portion of a top floor in a general house. It is characterized by being accommodated and arranged 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 suppression effect in terms of vibration mode. In addition, the decrease in the damping effect due to the tuning deviation due to the temperature change of the rubber mount is reduced or avoided by the plurality of divided sub-vibration systems with different natural frequencies, so that it is exposed to a significant temperature change in the attic. Even if it is done, a stable damping effect is exhibited. In addition, an ordinary house is a private house or an apartment house, and refers to an architectural house having one to several floors that does not belong to a high-rise building, and generally includes those having various structures such as wooden structures, steel frames, or reinforced concrete.

  According to a fifth aspect of the present invention, in the vibration reducing apparatus according to any one of the first to fourth aspects, at least one of the plurality of divided sub-vibration systems is replaced with another divided sub-vibration system. Is characterized by being supported by different structural members. In the present invention, by dividing the mass member having the optimum mass into the 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, a mass member having a large mass as a whole can be advantageously mounted within the limit of the load bearing strength of the building structure. In addition, as a structural member, various structural members (strength member) in a building structure may be employ | adopted according to the structure, kind, etc. of a building structure. Specifically, for example, in a general house, each divided mass can be supported by members such as various beams, slabs, girders, edges, and the like.

  According to a sixth aspect of the present invention, in the vibration reducing device according to any one of the first to fifth aspects, the rubber mounts in the sub-vibration system are each changed in the mounting direction with respect to the divided mass. By including a variable rubber mount that can adjust the spring constant in the horizontal elastic main axis direction in the divided sub-vibration system, and in each divided sub-vibration system, the mounting direction of the variable rubber mount with respect to the divided mass It is characterized in that different natural frequencies are set for the respective divided sub-vibration systems by making them different. In addition, in this aspect, the elastic main shaft in the divided sub-vibration system refers to the input direction of the load and the elastic deformation of the rubber mount when a load is input along the axis to the divided sub-vibration system. An axis that matches the displacement direction of the mass member and does not cause rotation or angular displacement in the divided mass.

  In the vibration reducing apparatus according to the sixth aspect, it is possible to adjust the natural frequency in the horizontal elastic main shaft direction in the divided sub-vibration system by changing the mounting direction of the variable rubber mount with respect to the divided mass. . Therefore, for example, even if the same rubber mount is adopted 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 isolated from the building structure. Can be tuned with a high degree of accuracy, thereby making it possible to easily obtain an excellent vibration control effect. When changing the mounting direction of the variable rubber mount, 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 as the whole split sub-vibration system does not change. From the viewpoints of stability and dynamic stability of the split sub-vibration system, it is more desirable.

  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, Anisotropy is imparted to the spring characteristics in the direction perpendicular to the axis by providing a hollow hole or a through slit in the rubber elastic body, or the first and second mounting members connected by the rubber elastic body. Anisotropy in the direction perpendicular to the axis is imparted by inclining the facing surface, or an inclined plate as described in JP-A-8-338467 or the like is embedded and fixed in a rubber elastic body. By attaching anisotropy, etc., a rubber mount whose spring characteristics in the direction perpendicular to the axis is anisotropic around the central axis is mounted in a state where the weight of the divided mass is exerted in the direction of the central axis, and divided. trout By changing the mounting direction around the center axis against the rubber mount etc. adjustable and the structure of the spring constant in the horizontal elastic principal axis in the divided mass can be employed. 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, and changing the mounting angle of the rubber mount to the divided mass in the vertical direction or in the horizontal direction, It is also possible to configure the variable rubber mount so that the spring constant in the horizontal elastic principal axis direction of the divided mass can be adjusted.

  Further, according to a seventh aspect of the present invention, in the vibration reducing apparatus according to the sixth aspect, the adjusting means capable of changing and setting the mounting direction of the variable rubber mount with respect to the divided mass with respect to the divided sub-vibration system. It is characterized by providing. As the adjusting means employed in this aspect, for example, a rubber mount having a plurality of positions that can be set in the mounting direction of the rubber mount including positioning holes by bolts is provided on at least one side of the mass member and the building structure. It is possible to adopt a structure that allows the mounting direction of the mount to be adjusted in multiple stages, especially when setting the mounting direction by rotating around the central axis extending in the vertical direction It is also possible to employ a structure in which a sliding plate or the like is disposed at the attachment portion on the structure side, and the attachment direction of the rubber mount can be adjusted steplessly by rotation around the central axis.

  In the seventh aspect, it is not necessary to configure the secondary vibration system spring member only with the variable rubber mount, and the variable rubber mount is combined with the rubber mount that does not contribute to the adjustment of the secondary vibration system spring constant. It is also possible to constitute a spring member. In addition, when using a plurality of variable rubber mounts, it is not necessary to change the mounting direction of all the variable rubber mounts, and tuning is possible by adjusting the mounting direction of only some of the variable rubber mounts. . Further, as described in Japanese Patent Application Laid-Open No. 8-338467, the spring member can also be configured by stacking rubber mounts in multiple stages. Only the installed rubber mount may be a variable rubber mount.

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

  Furthermore, an eighth aspect of the present invention is the vibration reducing apparatus according to the seventh aspect, wherein the adjusting means is an actuator means for changing a mounting direction of the variable rubber mount, and the actuator means. And control means for changing the mounting direction of the variable rubber mount by controlling the operation of the variable rubber mount. In the vibration reducing device according to the eighth aspect, the tuning work by changing the mounting direction of the variable rubber mount is further facilitated, and the variable rubber mount is mounted after the auxiliary vibration system is mounted on the building structure. It is also easy to tune by changing the mounting direction, or to re-tune. In particular, if a control means having a remote control structure for remotely operating the actuator means is adopted, the owner etc. can easily perform tuning correction even after completion of the building structure or after the upper building of the house. Further, it is possible to obtain a higher level of vibration control effect by performing tuning change according to the season, temperature, etc. manually or automatically using a sensor or the like.

  According to a ninth aspect of the present invention, in the vibration reducing device according to any one of the sixth to eighth aspects, in the divided sub-vibration system, the horizontal direction passes through the center of gravity of the divided mass. A plurality of the variable rubber mounts are arranged so as to be symmetrically located across two extending symmetrical axes, and the mounting directions of these variable rubber mounts are sandwiched between the two symmetrical axes. It is characterized in that it is set to be symmetric. In such a vibration reduction device according to this aspect, in each divided sub-vibration system, 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 rubbers Even when the mounting direction of the mount is changed or adjusted, the intended damping effect can be stably obtained by maintaining the static and dynamic stability of the divided mass advantageously.

  In the ninth aspect, the variable rubber mounts that are symmetrically located with respect to each axis of symmetry preferably have the same structure. On the other hand, spring characteristics and structures may be different between the variable rubber mounts that do not have a symmetric relationship with respect to any symmetry axis. In addition, the setting of the mounting direction of the variable rubber mount to be symmetric with respect to the two symmetry axes is, for example, that the variable rubber mounts arranged at symmetrical positions on both sides of any symmetry axis are It can be advantageously realized by arranging the tilt angles to be symmetrically the same.

  In the ninth aspect, the two orthogonal symmetry axes as the symmetry axes of the arrangement positions of the variable rubber mounts in all the divided sub-vibration systems are preferably at least one, more preferably two of them. Any of the books is set to have a vibration direction to be damped in the building structure. Furthermore, in the ninth aspect, desirably, in all the divided sub-vibration systems, two orthogonal symmetry axes as the symmetry axes of the positions where the variable rubber mounts are disposed are all divided as a whole of the divided sub-vibration system. Is set as the elastic main axis in the horizontal direction. As a result, the stability of the divided sub-vibration system is further improved, and the intended damping effect can be obtained more stably, and tuning of the divided sub-vibration system is facilitated.

  Thus, according to the vibration reducing device for a building structure according to the present invention, the initial tuning frequency in the secondary vibration system is the vibration to be damped of the building structure as the main vibration system due to a temperature change or the like. Even when it deviates from the frequency, an effective vibration reducing effect can be stably obtained.

  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 reducing 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 apparatus 10 includes a plurality of independent divided masses 14 and rubber mounts 16 that elastically support the divided masses 14 independently of each other, and each divided mass 14 has a plurality of rubbers. A plurality of divided sub-vibration systems 17 independent from each other are formed by being elastically supported by the mount 16 with respect to the house 12. In the present embodiment, as shown in the figure, all the divided sub-vibration systems 17 are mounted on the structural member 18 constituting the ceiling of the third floor in the three-story house 12.

  More specifically, the divided mass 14 constituting each divided sub-vibration system 17 is formed of a high specific gravity material such as metal, as shown in phantom lines in FIG. Those formed of a system metal or the like are preferably employed. The shape of the divided mass 14 is not particularly limited, but generally, a plate-shaped one is preferably employed, and more desirably, a rectangular plate shape, a polygonal plate shape, a circular plate shape, or the like that 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 adopting the divided mass 14 having such a shape, the vibration reducing device 10 can be advantageously installed in a housed state in a space such as the ceiling 20 on the uppermost floor, and each rubber mount 16 is subjected to displacement in the horizontal direction. Therefore, it is possible to obtain a stable vibration absorbing action by suppressing the angular displacement generated in the above. In particular, in the present embodiment, a divided mass 14 having a planar rectangular plate shape whose height dimension is constant throughout is adopted.

  In addition, 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, but the divided mass constituting all the divided sub-vibration systems. The total mass of 14 is set so as to give the optimum mass according to the vibration to be vibration-proof of the house 12 to be vibration-proof. Specifically, for example, a two-degree-of-freedom system composed of a house 12 as a main vibration system and a single sub-vibration system is considered, and a resonance curve of the main vibration system is obtained from a motion equation of this system, thereby obtaining a general dynamic vibration absorption. The optimum mass can be determined according to the optimum design method in the vessel. That is, based on the equation of motion of the two-degree-of-freedom system, the amplitude of the rubber mount 16 (the main vibration system and the sub-vibration system) is set so that the amplitude of the main vibration system is less than the required value. By determining the mass ratio (μ) of the main vibration system and the sub-vibration system so that the absolute value of the relative displacement of the sub-vibration system is less than the allowable value, the optimum mass of the divided mass 14 in the sub-vibration system can be determined . At that time, it is necessary to consider the load bearing strength of the house 12, and the optimum mass of the divided mass 14 may be determined from the limitation due to the load bearing strength of the house 12. At that time, since the optimum mass of the divided mass 14 is given as the total mass of all the divided masses 14, the load of each divided mass 14 is shared and supported by different structural members, that is, the house. By attaching each divided sub-vibration system 17 to a different structural member among the many structural members constituting 12 and supporting each divided mass 14 with a different structural member, the concentrated action of the load on the divided mass 14 is achieved. It is also possible to relax the load limitation of the divided mass 12 due to the reason for the load bearing strength of the house 12. By the way, in the case of a two-story building with a general lightweight steel frame or wooden frame structure, the total mass of the divided masses 14 in all the divided sub-vibration systems is about 100 to 1000 kg or more. Is set.

  And the mass of the some division | segmentation mass 14 is set so that the optimal mass calculated | required in this way may be given as a whole. The form of division into the plurality of divided masses 14 is not limited in any way. For example, the number of divisions depends on the tuning frequency of the main vibration system and the divided sub-vibration system to be considered due to manufacturing errors, temperature changes, and the like. It can be set as appropriate according to the relative deviation fluctuation range, the vibration form of the main vibration system (amplitude form, resonance curve form, etc.), the degree of required vibration reduction effect, and the like. In this case, the form of mass distribution to each divided mass 14 is not particularly limited. For example, the division constituting the sub-vibration system having the tuning frequency closest to the vibration frequency to be statistically isolated is provided. Set the mass to the mass in stages, or set the mass in stages so that the mass becomes larger in the secondary vibration system having the tuning frequency closest to the vibration frequency to be statistically isolated. 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 ease of manufacturing, cost, and the like, and the optimum mass is equally divided by each divided mass 14. Yes.

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

  The set value of the natural frequency in each of the divided sub-vibration systems 17 is not particularly limited, and the relative tuning frequencies of the main vibration system and the divided sub-vibration system to be considered due to manufacturing errors, temperature changes, and the like are not limited. It can be set as appropriate according to the fluctuation width of the gap, the vibration form of the main vibration system (amplitude form, resonance curve form, etc.), the degree of required vibration reduction effect, etc., but preferably the main vibration system In the housing 12, the divided sub-vibration system 17 having the natural frequency is set to exist on both the low frequency side and the high frequency side of the vibration frequency to be vibration-proofed. The natural frequencies of all the divided sub-vibration systems 17 are set so as to fall within a range of an appropriate peripheral frequency with respect to the vibration frequency to be vibrated. With such a setting, it is possible to advantageously cover a tuning deviation width between the main vibration system (house 12) and the divided sub vibration system 17 expected in a normal environment in a general house. Desirably, particularly in a case where a vibration reduction effect of about 10 dB is aimed at a general house, in the plurality of divided sub-vibration systems 17, the difference between the natural frequencies of those adjacent to each other in the natural vibration frequency is determined as the main vibration. In the system (house 12), it is set to 5 to 30%, more preferably 10 to 20% of the vibration frequency to be damped. This makes it possible to obtain an effective vibration reduction effect more efficiently and effectively over a wide frequency range of the main vibration system. If the natural vibration frequency difference between the adjacent divided sub-vibration systems 17 and 17 is too small, an effective vibration reduction effect can be efficiently ensured over a wide tuning deviation range between the main vibration system and the sub-vibration system. This is because it becomes difficult, and if the natural vibration frequency difference between the adjacent divided sub-vibration systems 17 and 17 is too large, the vibration reducing effect effective in the middle range of the natural vibration frequencies of these divided sub-vibration systems 17 and 17 is achieved. This is because there is a possibility that it will be difficult to exhibit.

  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%. Consider the use of the split sub-vibration system 17 in which the loss coefficient of the spring portion is 0.1 to obtain the target vibration reduction device 10. As a result, it was confirmed by calculation that it is effective to set the natural frequency of each divided sub-vibration system 17 according to the number of divided sub-vibration systems 17 as shown in Table 1 below. In this calculation, the equivalent mass of the main vibration system is 30000 kg, and the total mass of the divided mass 14 of the divided sub-vibration system 17 is 600 kg. As can be seen from Table 1, when the number of divided sub-vibration systems is, for example, four, the ratio of the natural frequency of each divided sub-vibration system to the vibration frequency of the main vibration system to be isolated is 0.82, 0.93, 1.07, and 1.22, and the difference in natural frequency between adjacent natural frequencies (described in Table 1 as a natural frequency ratio) is 0.11. , 0.14 and 0.15. That is, the difference in natural frequency between adjacent natural frequencies is set to be different.

  And the result of having calculated | required the vibration reduction effect in the vibration reduction apparatus 10 comprised by the some division | segmentation secondary vibration system 17 which set the mutually different natural frequency in this way by simulation is shown in FIG. From FIG. 3 as well, in the vibration reducing device 10 having the above-described structure, the target vibration reducing effect can be obtained effectively over a sufficiently wide frequency range. Even if the natural frequency of the divided sub-vibration system 17 that was initially tuned with respect to the vibration frequency to be damped in the house 12 is shifted due to a temperature change of 16 or the like, a plurality of divided sub-vibrations As a whole, it is recognized that an effective damping effect can be obtained for the house 12 as a whole. Note that the tuning range of the natural frequency of the plurality of divided sub-vibration systems 17 can generally be set wider as the number of the divided sub-vibration systems 17 is larger, as shown in the figure, but over a very wide range. Therefore, there is a risk that there will be a split sub-vibration system that does not contribute effectively to vibration isolation.Therefore, the tuning range of such a sub-sub-vibration system depends on the vibration mode of the main vibration system and the required damping effect. For example, in the case of a general house as described above, it is desirable to set a frequency range of 30% above and below the vibration frequency to be damped in the house 12. .

  By the way, in order to set different natural frequencies for the plurality of divided sub-vibration systems 17 in this way, for example, in all the divided sub-vibration systems 17, the mass of the divided mass 14 and vibration isolation in the rubber mount 16 are performed. Tuning can be performed by varying at least one of the spring constant in the direction of power oscillation. Here, in particular, in the present embodiment, as described above, the same divided mass 14 is adopted in all the divided sub-vibration systems 17, and each divided sub-vibration system 17 has the same structure. A plurality of rubber mounts 16 constitute a spring system, and the divided mass 14 is elastically supported.

  Each of the rubber mounts 16 has an anisotropic spring constant in the horizontal direction, and has different spring characteristics depending on directions around the mount center axis 38 extending in the vertical direction (directions orthogonal to the center axis). Have. In each of the divided sub-vibration systems 17, it is possible to set the natural frequency in the horizontal direction to be different from each other by adopting the same rubber mount and changing the number of the mounts. In the embodiment, in any divided sub-vibration system 17, a spring system is configured by the same number of rubber mounts 16 having the same structure.

  Here, as shown in FIGS. 4 and 5, the rubber mount 16 includes a first mounting bracket 22 as a first mounting member and a second mounting bracket 24 as a second mounting member. However, the first mounting bracket 22 and the second mounting bracket 24 are elastically supported by a rubber elastic body 26 interposed between the opposing surfaces of both the brackets 22, 24. It has the structure connected to. The first mounting bracket 22 has a block shape with an inverted triangle cross section, and a mounting bolt 28 projects from the center of the upper bottom surface 27 thereof. The second mounting bracket 24 has a rectangular flat plate shape, and both longitudinal sides sandwiching the flat plate portion 30 located at the center are oblique to the first mounting bracket 22 side (the upper side in FIG. 4). Are inclined plate portions 32 and 32. A mounting bolt 34 that protrudes downward (on the side opposite to the first mounting bracket 22) is fixed at the center of the flat plate portion 30 of the second mounting bracket 24. Further, the inclined surfaces 36 and 36 on both sides of the first mounting bracket 22 and the inclined plate portions 32 and 32 on both sides of the second mounting bracket 24 are located on both sides of the mount center shaft 38 on the center of the mount. In a direction inclined by substantially the same angle with respect to the shaft 38, the entire surface is opposed to the shaft 38 with a substantially constant interval. The first mounting bracket 22 and the second mounting bracket are respectively provided by a pair of rubber blocks 40 and 40 having a substantially rectangular block shape interposed between the inclined surfaces 36 and the opposing surfaces of the inclined plate portion 32. A rubber elastic body 26 that elastically connects 24 is configured. Furthermore, in the present embodiment, in the second mounting bracket 24, a positioning piece 42 that protrudes outward from one side surface of the flat plate portion 30 is integrally formed. The positioning piece 42 is formed with a bolt insertion hole 44 for fixing the position.

  That is, in the rubber mount 16 of the present embodiment, the elastic main shafts of the two independent rubber blocks 40, 40 are inclined with respect to each other, and therefore, in the vertical direction extending along the mount center axis 38 in FIG. It has an elastic main shaft, a horizontal first elastic main shaft extending in a direction perpendicular to the paper surface, and a horizontal second elastic main shaft extending in the left-right direction in the drawing. In the rubber mount 16 having such a structure, the main deformation of the rubber elastic body 26 at the time of load input is sheared in the direction of the first elastic main shaft in the horizontal direction, 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 is compression / tension, and the spring constant in the horizontal direction is maximized. Thereby, in this 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 the horizontal reference direction in the rubber mount 16.

  The rubber mount 16 has a first mounting bracket 22 fixed to the divided mass 14. The first mounting bracket 22 may have its mounting bolts 28 screwed directly to the divided mass 14, but the mounting direction of the first mounting bracket 22 with respect to the divided mass 14 can be easily changed. Thus, for example, the first mounting bracket 22 may be attached to the divided mass 14 via a bearing mechanism, a sliding contact plate mechanism, or the like. In the present embodiment, as shown in FIG. 2, four rubber mounts 16 are respectively attached to the four corner portions of the rectangular flat plate-shaped divided mass 14. On the other hand, as shown in FIG. 1, the second mounting bracket 24 of the rubber mount 16 is attached to the top structural member 18 of the top floor of the three-story house 12 by the mounting bolt 34. It is attached directly or via a bearing mechanism, a sliding contact plate mechanism, or the like, like the one mounting bracket 22. 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. And a single vibration system having four rubber mounts 16 as spring members, and the sub-vibration system 17 functioning as one sub-vibration system for the main vibration system composed of the three-story house 12 by this vibration system. Furthermore, the vibration reducing device 10 is configured by mounting a plurality of such divided sub-vibration systems 17 on the house 12 independently of each other in parallel.

  In addition, in the mounted state of the vibration reducing device 10, in any divided sub-vibration system 17, the divided mass 14 is supported in a state of spreading in the horizontal direction, and each rubber mount 16 has its The mount center axis is arranged in a state extending in the vertical direction.

  Further, as shown in FIG. 6, the second attachment of each rubber mount 16 is attached to the structural member 18 of the three-storied house 12 to which the rubber mount 16 constituting each divided sub-vibration system 17 is attached. Bolt holes 46 are provided in the mounting portion of the metal fitting 24. Then, the positioning bolts 48 inserted into the positioning pieces 42 of the second mounting bracket 24 are screwed into the bolt holes 46, whereby the mounting direction of the rubber mount 16 with respect to the structural member 18 and the divided mass 14 (mount center). The circumferential position around the shaft 38) is fixedly determined. Here, a plurality of such bolt holes 46 are formed at substantially equal intervals around the mount center axis 38 (in the present embodiment, five in a range of approximately 90 degrees). As a result, the rubber mount 16 is rotated around the mount center axis 38, and the positioning bolt 48 inserted through the positioning piece 42 is screwed into any of the bolt holes 46, whereby the mounting direction of the rubber mount 16 is changed. It can be arbitrarily changed and set at an interval of approximately 22.5 degrees.

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

  Further, the four rubber mounts 16 in each divided sub-vibration system 17 are disposed so as to be symmetrically located on the divided mass 14 with two symmetrical axes X and Y extending in the horizontal direction perpendicular to each other. ing. In the present embodiment, the two symmetry axes X and Y in the divided mass 14 are both inertial main axes extending in the horizontal direction of the divided mass 14. Further, in the elastic support system including the divided mass 14 and the four rubber mounts 16, the elastic main shaft extending in the vertical direction is set so as 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 are positioned symmetrically with respect to the first axis of symmetry: X. In addition, the first rubber mount 16a and the third rubber mount 16c, and the second rubber mount 16b and the fourth rubber mount 16d are positioned symmetrically with respect to the second symmetry axis Y.

  Further, these four rubber mounts 16a to 16d are set so that their mounting directions are symmetrical with respect to the two symmetry axes X and Y of the divided mass 14. Specifically, in FIG. 2, with respect to the first axis of symmetry: X, the intersection angle of the horizontal reference direction line 50a of the first rubber mount 16a: the intersection angle of θxa and the horizontal reference direction line 50b of the second rubber mount 16b. : Θxb is the same, and the angle of intersection of the horizontal reference direction line 50c of the third rubber mount 16c: the angle of intersection of the horizontal reference direction line 50d of the second rubber mount 16d: θxd is set to be the same. Yes. Regarding the second axis of symmetry: Y, the angle of intersection of the horizontal reference direction line 50a of the first rubber mount 16a: θya and the angle of intersection of the horizontal reference direction line 50c of the third rubber mount 16c: θyc are the same. The intersection angle θyb of the horizontal reference direction line 50b of the second rubber mount 16b and the intersection angle θyd of the horizontal reference direction line 50d of the second rubber mount 16d are set to be the same.

  Thus, even when the mounting direction of the rubber mounts 16a to d is changed by setting and maintaining the mounting direction of the four rubber mounts 16a to 16d, the divided mass 14 and the four rubber mounts are changed. The direction of the elastic main axis in the horizontal direction as the entire divided sub-vibration system composed of 16a to 16d is maintained in the first symmetry axis: X direction and the second symmetry axis: Y direction in the divided mass 14. It has come to be. And the direction of the main vibration which should be vibration-proofed in the house 12 whose direction of these 1st symmetry axes: X and 2nd symmetry axis: Y are vibration-control symmetry, respectively, for example, a plane rectangular frame In the case of a house having a structure, the installation direction of the vibration reducing device 10 with respect to the house 12 is set so as to be parallel to each side. As a result, for each divided sub-vibration system 17 constituting the vibration reducing device 10, vibrations in two directions to be vibrated are both input in the elastic main axis direction in the divided sub-vibration system 17. Effective vibration suppression effects can be exhibited for each of the vibrations input in these two directions.

  Further, in each of the divided sub-vibration systems 17 as described above, the rubber mounts 16a to 16d having the horizontal spring constant anisotropy are employed as the spring members, so that the rubber mounts 16a to 16d are used. The spring constants in the two elastic principal axis directions (first symmetric axis: X direction and second symmetric axis: Y direction), which are input directions of vibration to be damped, are changed by changing the mounting direction of Both are designed to be changed. Specifically, in the present embodiment, the direction of the first symmetry axis: X in the divided sub-vibration system 17 as the value of the intersection angle: θx with respect to the first symmetry axis: X of each rubber mount 16a-d decreases. Is changed to a direction in which the spring constant in the direction of Y is small and the spring constant in the direction of the second symmetry axis Y is increased. As a result, by reducing the value of the crossing angle: θx with respect to the first symmetry axis: X of each rubber mount 16a-d, the natural frequency in the direction of the first symmetry axis: X in the divided sub-vibration system 17 is reduced. The natural frequency in the direction of the second symmetry axis: Y can be shifted to the high frequency side, and the angle of intersection of each rubber mount 16a-d with respect to the first symmetry axis: X: θx By increasing the natural frequency in the direction of the first symmetry axis: X in the divided sub-vibration system 17 on the high frequency side and the natural frequency in the direction of the second symmetry axis: Y on the low frequency side. Each of them can be migrated. As is clear from this, in this embodiment, any rubber mount 16 is a variable rubber mount.

  Therefore, in the vibration reducing apparatus 10 including the plurality of divided sub-vibration systems 17 having the structure as described above, in all the divided sub-vibration systems 17, both the divided mass 14 and the rubber mount 16 are the same. By simply changing the mounting direction (installation direction) of the rubber mounts 16 between the divided sub-vibration systems 17, the natural frequencies in these divided sub-vibration systems 17 can be shifted from each other. It can be set to a different value.

  Moreover, the natural frequency in each divided sub-vibration system 17 is also a problem 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 be appropriately adjusted according to the vibration. As a result, an effective vibration damping effect can be obtained easily, with high accuracy, and at a low cost. In particular, in the present embodiment, the spring member that elastically supports the divided mass 14 is configured by only 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 a larger tuning width of the natural frequency of the divided sub-vibration system 17 by changing the mounting direction of the rubber mount 16 is ensured.

  As described above, the range of the natural frequency of the vibration reducing device 10 that can be adjusted by using one rubber mount 16 and changing its mounting direction depends on the spring characteristics of the rubber mount 16 used. There is a limit. Therefore, in order to obtain a greater degree of tuning freedom in each divided sub-vibration system 17, a plurality of types of rubber mounts 16 having different spring characteristics are prepared in advance, for example, considering the structure of the house 12 and the like. Of these, it is desirable that the rubber mount 16 having appropriate spring characteristics is appropriately selected and adopted for each divided sub-vibration system 17 or for each vibration reduction device 10. As a result, the selection of the spring characteristics of the rubber mount 16 itself and the adjustment of the mounting direction of the rubber mount 16 are combined with each other to select an optimum value, so that the natural frequency of each divided sub-vibration system 17 is extremely wide. Therefore, it is possible to efficiently provide the vibration reducing device 10 capable of exhibiting an effective vibration damping effect for various types of building structures.

Incidentally, in the divided sub-vibration system 17 having the above-described structure, a flat square shape having a mass of 400 kg is adopted as the divided mass 14, and the rubber mount 16 is used in the first elastic main axis direction (the surface of FIG. 4). Spring constant in the direction perpendicular to: When KI is 18000 N / m, 22000 N / m, 26000 N / m, 30000 N / m, 34000 N / m, 38000 N / m, 42000 N / m , The tuning frequency realized by changing the mounting direction of each rubber mount 16 (the first symmetric axis in the split sub-vibration system 17: the natural frequency in the X direction and the second symmetric axis: the Y direction) FIG. 7 shows the result of simulation of the natural frequency at (1). In this simulation, each of the rubber mounts 16 has a spring constant: KI in the first elastic principal axis direction (direction perpendicular to the paper surface of FIG. 4) and a second elastic principal axis direction (left-right direction in FIG. 4). ) Spring constant: KII was set so as to satisfy the following formula. Further, the mounting direction of each rubber mount 16 was examined in the case where the angle of intersection: θx (see FIG. 2) with respect to the first symmetry axis: X was changed in the range of 0 to 90 degrees.
KI: KII = 1: 3

  As is apparent from the results shown in FIG. 7, seven types of rubber mounts 16 are prepared, and they are selectively adopted, and the mounting direction of the selected rubber mounts 16 is appropriately adjusted, whereby the divided submounts 16 are mounted. The natural frequency of the vibration system 17 is set with sufficiently fine tuning accuracy over almost the entire range of 3 to 5 Hz and its surrounding frequency, which is a problem for ordinary 2-3 storey houses and is cheap. Is possible.

  As mentioned above, although embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this embodiment.

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

  In addition, as illustrated, the specific structure of the anisotropic rubber mount in which the horizontal spring characteristics are changed by changing the mounting direction around the vertical axis is not limited at all. For reference, other specific examples of anisotropic rubber mounts that can be employed in the present invention are shown in FIGS. 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. A central portion in which the inclined plate portions 68 and 68 extending integrally are formed into a bent plate shape, and the second mounting bracket 70 attached to the structural member side of the house is bent into a mountain shape and protrudes upward. The flat plate-shaped mounting plate portions 76 and 76 having bolt holes 74 on both sides of 72 are formed into a bent plate shape. The inclined plate portions 68 and 68 of the first mounting bracket 62 are spaced apart and opposed to the side slopes 78 and 78 of the central portion 72 of the second mounting bracket 70, respectively. A pair of rubber blocks 80, 80 as rubber elastic bodies are interposed between the opposing surfaces. Also in the rubber mount 60 having such a structure, the spring in the horizontal direction in the direction of the first elastic main shaft in the horizontal direction extending in the direction perpendicular to the paper surface in FIG. 8 is similar to the rubber mount (16) according to the above embodiment. While the constant is minimized, the spring constant in the horizontal direction is maximized in the direction of the second elastic main axis in the horizontal direction extending in the left-right direction in the drawing. 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 bracket 84 attached to the divided mass side having a substantially inverted truncated cone shape, and a second attached to the structural member side of the house. The mounting bracket 86 is a large-diameter cylindrical shape. A second mounting bracket 86 is disposed at a position vertically below the central axis of the first mounting bracket 84, and the outer peripheral surface of the first mounting bracket 84 and the second mounting bracket 86 are arranged. A rubber elastic body 84 having a tapered thick annular plate shape with a central portion protruding upward is interposed between the radially opposed surfaces of the inner peripheral surface and the rubber elastic body 84. The outer peripheral surface of the first mounting bracket 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. Further, the rubber elastic body 84 is formed with a pair of slits 88 and 88 penetrating in the axial direction at both side portions sandwiching the first mounting bracket 84 in one radial direction. Also in the rubber mount 82 having such a structure, the spring constant in the horizontal direction is minimized in the vertical direction in FIG. 10 as in the rubber mount (16) according to the above embodiment, while in the horizontal direction in FIG. The spring constant in the horizontal direction is maximized. Therefore, such a rubber mount 82 can also be advantageously employed in the embodiment.

  In addition, in the rubber mount 90 shown in FIGS. 11 to 12, the first mounting bracket 92 attached to the divided mass side has a large-diameter cylindrical shape, while the second attachment attached to the structural member side of the house. The mounting bracket 94 has a small-diameter cylindrical shape. A first mounting bracket 92 is disposed so as to be spaced radially outward of the second mounting bracket 94 and eccentric in the vertical direction (vertical direction in FIGS. 11 and 12). Note that the second mounting bracket 94 is fixed with flat plate-like retainers 96 that protrude on both sides in the horizontal direction on the outer peripheral surface. A rubber elastic body 98 having a generally thick disk shape as a whole is interposed between the radially-facing surfaces of the first mounting bracket 92 and the second mounting bracket 94, and the rubber elastic body. The outer peripheral surface of 98 is vulcanized and bonded to the inner peripheral surface of the first mounting bracket 92, and the inner peripheral surface of the rubber elastic body 98 is vulcanized and bonded to the outer peripheral surface of the second mounting bracket 94. The rubber elastic body 98 is formed with a pair of slits 100 and 102 penetrating in the axial direction on both side portions sandwiching the second mounting bracket 94 in the vertical direction. The tensile stress in is reduced. Note that, in the situation where the illustrated external force is not exerted, the upper slit 100 is greatly opened and the lower slit 102 is crushed up and down, but the weight of the divided mass acts. As the rubber elastic body 98 is elastically deformed, the upper and lower slits 100 and 102 have substantially the same size. Also in the rubber mount 90 having such a structure, the spring constant in the horizontal direction is minimized in the left-right direction (mount axis direction) in FIG. 12, as in the rubber mount (16) according to the above-described embodiment. The spring constant in the horizontal direction is maximized in the left-right direction (the direction perpendicular to the mount axis). Therefore, such a rubber mount 90 can also be advantageously employed in the embodiment.

  The rubber mounts 106 shown in FIGS. 13 to 14 each have a rectangular flat plate shape, and have a first mounting bracket 108 and a second mounting bracket 110 which are disposed to face each other while being separated from each other. A rubber elastic body 112 having a rectangular block shape is interposed between the opposing surfaces of the first mounting bracket 108 and the second mounting bracket 110. Then, the first mounting bracket 108 and the second mounting bracket 110 are respectively vulcanized and bonded to the upper and lower end surfaces of the rubber elastic body 112, and thus the first mounting bracket 108 and the second mounting bracket 110. Are elastically connected by the main rubber elastic body 112. Further, the first mounting bracket 108 and the second mounting bracket 110 are fixedly provided with mounting bolts 114 and 116 projecting upward and downward from the respective central portions, and by these mounting bolts 114 and 116, The first mounting bracket 108 is mounted on the mass body side, and the second mounting bracket 110 is mounted on the structural member side of the house. The rubber mount 106 is mounted with the mount center axis extending 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 the approximately vertical direction. It is done. Here, as shown in FIG. 14, the main rubber elastic body 112 has a longitudinal rectangular shape with a short side of side length: a and a long side of side length: b on the cut surface in the horizontal direction. is doing. By adopting the main rubber elastic body 112 in which the lengths of two adjacent sides are different as described above, the rubber mount 106 of the present embodiment is also deformed against the bending deformation generated in the main rubber elastic body 112 during shear deformation. Due to the difference in ease, the spring constant in the horizontal direction is minimized in the vertical direction in FIG. 14 (the opposing direction of the pair of long sides in the main rubber elastic body 112), while in the left-right direction in FIG. 112), the spring constant in the horizontal direction is maximized. Therefore, such a rubber mount 106 also has the same characteristics as the rubber mount 106 of the above embodiment, and can be advantageously employed in the above embodiment.

  Furthermore, in the present invention, in addition to the anisotropic rubber mount as described above, it is also possible to employ a rubber mount in which the spring constant in the direction perpendicular to the axis perpendicular to the center axis of the mount is substantially constant in any direction. is there. For example, as shown in FIGS. 15 to 16, the first mounting bracket 120 and the second mounting bracket 122 each having a disc shape and arranged to be spaced apart from each other in the axial direction are connected to each other. It is also possible to employ a rubber mount 126 having a structure in which it is elastically connected by a circular block-shaped rubber elastic body 124 interposed between the opposing surfaces. The rubber mount 126 includes a rotary shaft 130 in which a first mounting shaft 128 that protrudes axially outward (upward) from the first mounting bracket 120 extends in the horizontal direction with respect to the mass body 14. And a second mounting shaft 132 projecting from the second mounting bracket 122 axially outward (downward) is fixed to the structural member 18 of the house. The bracket 134 is bolt-fixed in an arbitrary rotation state around the rotation shaft 130 in the rubber mount 126. In short, the bracket 134 has a plurality of positioning holes 136 penetrating on an arc centered on the rotation shaft 130, and the fixing bolts 138 inserted into any of the positioning holes 136, the first of the rubber mount 126. Two mounting shafts 132 are fixedly supported. Then, by adjusting the bolt fixing position of the second mounting shaft 132 with respect to the bracket 134, the inclination angle of the central shaft 140 of the rubber mount 126 that elastically supports the mass body 14 with respect to the structural member 18 with respect to the vertical line. : Α 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 secondary vibration system can be changed by changing the inclination angle: α as the mounting direction. The smaller the value is, the closer the central axis of the rubber mount 126 is to the vertical direction, the deformation of the rubber elastic body 124 when the mass body 14 is displaced in the horizontal direction is mainly shear deformation, and the horizontal spring While the constant is decreased, the value of α is increased to bring the central axis of the rubber mount 126 closer to the horizontal direction, and the deformation of the rubber elastic body 124 when the mass body 14 is displaced in the horizontal direction mainly causes compression / tensile deformation. The horizontal spring constant is increased. Therefore, such a rubber mount 126 can also be advantageously employed as a rubber mount that elastically supports the divided mass 14 in the embodiment.

  Note that it is desirable that such a rubber mount 126 maintains the horizontal elastic main axis in the secondary vibration system constant even when the mounting direction is changed. Therefore, preferably, a plurality of rubber mounts 126 are arranged at symmetrical positions with elastic main axes X and Y as two orthogonal symmetry axes extending horizontally through the center of gravity 14 of the mass body 14 and O. The mounting directions of the rubber mounts 126 are set so as to be symmetric with respect to the two elastic main shafts X and Y.

  More specifically, for example, as shown in FIG. 16, two pairs of rubber mounts 126a in which the inclination angle of the mount center axis can be changed and adjusted on a vertical plane parallel to the vertical plane including the X axis. -D and two pairs of rubber mounts 126e-h in which the inclination angle of the mount central axis can be changed and adjusted on a vertical plane parallel to the vertical plane including the Y-axis, and one pair of rubber mounts By setting the inclination angles of 126a to 126d to be the same as each other, and setting the inclination angles of the rubber mounts 126e to 126h forming the other pair to be the same, the horizontal elastic main axis in the secondary vibration system is kept constant. On the other hand, it is possible to advantageously change and adjust the spring constant in each elastic main shaft direction in the horizontal direction. In particular, if the mounting 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 such as.

  Alternatively, as shown in FIG. 17, a total of four rubber mounts 126 a to 126 d are arranged so as to be symmetric with respect to the two elastic main axes X and Y passing through the center of gravity 14 of the mass body 14. By arranging and adjusting the mounting direction of each rubber mount 126a-d with respect to the mass body 14 in the vertical direction and the horizontal direction while maintaining the objectivity of the inclination angle with respect to the two elastic main axes: X and Y, Both elastic main shafts: The spring constants in the X and Y directions can be set simultaneously.

  Furthermore, even when the arrangement form 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 not changed in the horizontal direction). ), The spring constant ratio (natural frequency ratio) in the two horizontal directions (X-axis direction and Y-axis direction) in the secondary vibration system also by changing the inclination angle of the mount center axis only on the vertical plane including the X-axis. ) Can be changed and tuned. However, in FIG. 15, the change in the spring constant when the inclination angle (α) of the rubber mount 126 is changed in the vertical plane is large in the left-right direction on the paper surface, and in the direction perpendicular to the paper surface, the rubber of the rubber mount 126 is changed. Since the elastic deformation in the 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 and increased only in the vertical plane. This makes it possible to increase the spring constant ratio in the two horizontal directions (X-axis direction and Y-axis direction) in the sub-vibration system.

  Furthermore, in each divided sub-vibration system 17, an attenuator that can exert a damping force when the divided mass 14 is displaced with respect to the structural member 18 can be used as necessary.

  Further, the arrangement position of the vibration reducing device 10 can be appropriately changed in consideration of the structure of the building structure, the vibration mode, and the like in addition to the ceiling portion on the uppermost floor as illustrated, the underfloor portion, and the like. Furthermore, it is also possible to install the divided sub-vibration systems 17 constituting the vibration reducing device 10 at different locations.

  In addition, the present invention provides vibrations for various building structures such as three-story houses as shown, one-story, two-story, or four-story houses, or warehouses, buildings, and towers. Needless to say, any of the reduction devices can be applied.

  In addition, although not listed one by one, the present invention can be implemented in a mode with various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the invention.

It is the schematic which shows the mounting state to the building structure (house) of the vibration reduction apparatus as one Embodiment of this invention. It is a plane schematic explanatory drawing which shows one division | segmentation sub-vibration system which comprises the vibration reduction apparatus shown by FIG. It is a graph which shows the result of having calculated | required the anti-vibration effect of the vibration reduction apparatus made into the structure according to this invention by simulation. It is a front view which shows the rubber mount employ | adopted as the vibration reduction apparatus shown by FIG. FIG. 5 is a perspective view of the rubber mount shown in FIG. 4. It is a top view for demonstrating the structure of the attachment site | part with respect to the structural member of the rubber mount in the vibration reduction apparatus shown by FIG. It is a graph which shows the tuning property of the natural frequency in the division | segmentation secondary vibration system shown by FIG. It is a front view which shows another structural example of the rubber mount which can be employ | adopted for the vibration reduction apparatus shown by FIG. It is a longitudinal cross-sectional view which shows another structural example of the rubber mount which can be employ | adopted for the vibration reduction apparatus shown by FIG. FIG. 9 is a plan view of the rubber mount shown in FIG. 8. It is a front view which shows another structural example of the rubber mount which can be employ | adopted for the vibration reduction apparatus shown by FIG. It is a longitudinal cross-sectional view of the rubber mount shown by FIG. It is a perspective view which shows another structural example of the rubber mount which can be employ | adopted for the vibration reduction apparatus shown by FIG. FIG. 14 is a cross-sectional view of the rubber mount shown in FIG. 13. It is a front view which shows another structural example of the rubber mount which can be employ | adopted as the vibration reduction apparatus shown by FIG. 1 in the mounting state to a sub vibration system. FIG. 16 is a schematic plan view illustrating a specific example of a split sub-vibration system configured by adopting the rubber mount illustrated in FIG. 15. FIG. 16 is a schematic plan explanatory view showing another specific example of the divided sub-vibration system configured by adopting the rubber mount shown in FIG. 15.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vibration reduction apparatus 12 Housing 14 Divided mass 16 Rubber mount 18 Structural member 42 Positioning piece 46 Bolt hole 48 Positioning bolt

Claims (6)

In the vibration reducing device that constitutes the secondary vibration system by elastically supporting the mass member with a plurality of rubber mounts for the building structure to be damped,
The mass member is constituted by three or four 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. Are elastically supported by the rubber mount independently from each other to form the three or four divided sub-vibration systems, and different natural frequencies are set for the divided sub-vibration systems. On the other hand, the natural frequencies of the three or four divided sub-vibration systems are set on both the low frequency side and the high frequency side of the vibration frequency of the building structure obtained under the standard conditions. Further, the tuning range of the natural frequency of the divided sub-vibration system is set within a frequency range of 30% above and below the vibration frequency of the building structure to be isolated. Set as Rutotomoni, wherein the difference in the natural frequency between those natural frequencies are adjacent to each other, and set to be different, respectively, in each of the divided sub-vibration system in the vibration reduction device, and
Each of the rubber mounts in the divided sub-vibration system is divided by changing the mounting direction with respect to the divided mass by rotating around the center axis of the mount extending in the vertical direction, in which the horizontal spring constant is anisotropic. A variable rubber mount that can adjust the spring constant in the horizontal elastic main axis direction in the secondary vibration system is configured. In each divided secondary vibration system, the divided mass is rotated by rotation of the variable rubber mount about the mount center axis. By setting different mounting directions for the different sub-vibration systems, different natural frequencies are set.
In the split sub-vibration system, a plurality of the variable rubber mounts are disposed so as to be symmetrically positioned with two orthogonal symmetry axes extending in the horizontal direction through the center of gravity of the split mass, and A vibration reducing device for a building structure, characterized in that the mounting directions of these variable rubber mounts are set so as to be symmetric with respect to the two symmetry axes . At least one of the divided masses constituting the three or four divided sub-vibration systems is a mass different from the other divided masses, and the natural frequency closest to the vibration frequency of the building structure to be isolated. The vibration reduction device for a building structure according to claim 1, wherein a divided mass having the largest mass is adopted in the divided sub-vibration system set to 1.   The vibration reduction device for a building structure according to claim 1 or 2, wherein each of the divided sub-vibration systems is supported by a ceiling portion of the uppermost floor in a general house and accommodated in the attic. The vibration for a building structure according to any one of claims 1 to 3, wherein at least one of the three or four divided sub-vibration systems is supported by a structural member different from the other divided sub-vibration systems. Reduction device. The vibration reducing device for a building structure according to any one of claims 1 to 4, further comprising adjustment means capable of changing and setting a mounting direction of the variable rubber mount with respect to the divided mass in the divided sub-vibration system. The first mounting bracket and the second mounting bracket are spaced apart from each other on both sides of the mount center axis, the variable rubber mount being positioned in a direction inclined symmetrically with respect to the mount center axis at the same angle. The vibration for a building structure according to any one of claims 1 to 5, which has a structure formed by elastically connecting the inclined surfaces opposed to each other independently by two rubber blocks. Reduction device.

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