JP4785518B2 - Building damping device - Google Patents

Description

  The present invention relates to a vibration damping device that is used for vibration damping of columns, beams, joists, and the like in buildings. In particular, the natural frequency of a dynamic damper composed of a mass having a predetermined mass and a rubber elastic body having predetermined spring characteristics and damping characteristics, and a mounting bracket for mounting the dynamic damper on a building and the dynamic damper are combined. The vibration control device for buildings is made to have different natural frequencies, and the two natural frequencies are used to suppress the sound generated on the lower floor when the impact force is input from the upper floor, and the person on the upper floor The present invention relates to a building vibration control device that can reduce sound generated during walking in a wide frequency range.

  Generally, in steel-framed houses, steel frames made of H-shaped steel, C-shaped steel, etc. are used for the columns and beams that form the skeleton. As a result, the damping force (damping characteristic) is inferior. Considering these points, in order to ensure high heavy-weight floor impact sound performance in conventional steel-framed houses, floor damping material is installed on the beam between the upper floor and the lower floor ceiling. In addition, some are provided with a floor damping material.

  However, since the floor damping material has a heavy mass, there is a problem that the installation requires a lot of labor. In addition, damping material for small beams and damping material for large beams are installed between the upper and lower beams, and a sound absorbing material made of glass wool etc. is installed at the ceiling of the lower floor. Is to be installed. For this reason, in the conventional one, it is necessary to prepare a large number of different types of damping members as described above, which is disadvantageous in terms of cost. Further, when laying various damping materials having a large mass, the laying work becomes complicated, and the work efficiency may be reduced.

Therefore, as shown in FIG. 10, in order to absorb the vibration, there is a structure in which a dynamic damper 110 is provided on the large beam 4 and the small beam 5 provided between the upper floor and the lower floor to support the ceiling of the lower floor. (For example, refer to Patent Document 1). In this case, as shown in FIG. 7, in order to strongly absorb the vibration of a predetermined frequency, the natural frequency of the dynamic damper 110 and the entire damping device when the dynamic damper 110 is attached to the mounting bracket. The natural frequency was adjusted to match.
However, the vibration generated in the building has many different frequencies, and in order to absorb the vibration, it is necessary to attach the dynamic dampers 110 having different natural frequencies. For this reason, different dynamic dampers 110 are manufactured and prepared, which complicates the manufacturing process and increases the manufacturing cost.

Also, in dynamic dampers for automobiles, there is a technology that configures the main vibration system by arranging a plurality of double vibration systems made of mass rubber through a spring material to reduce the anti-resonance caused by the main vibration system. (For example, refer to Patent Document 2). However, this technology reduces the anti-resonance caused by the main vibration system, and in order to be applied to a vibration system having a plurality of resonance frequencies, it is necessary to install dynamic dampers having a plurality of different natural frequencies. It was.
Japanese Patent Laid-Open No. 2004-3280 JP 2003-28234 A

  In order to solve these problems, multiple dynamic dampers with the same specifications and specifications and multiple mounting brackets with different spring constants are prepared to absorb the vibrations of different frequencies generated by the building. SUMMARY OF THE INVENTION It is an object of the present invention to provide a building vibration control device that can reduce sound generated when a person walks in the city.

In order to solve the above problems, the present invention of claim 1 is attached to a pillar, beam, joist of a building, and is composed of a rubber part having an elastic body and a mass part having a mass body. In a building damping device composed of a dynamic damper and a mounting bracket for mounting the dynamic damper to a building,
The characteristic of the rubber elastic body of the rubber part is formed in the range of tan δ of 0.01 to 0.7, and the rubber part is bonded to the rubber elastic body, and the mass mounting plate and the bracket mounting plate are bonded above and below the rubber elastic body. The mass mounting plate and the mass part, and the mounting bracket and the bracket mounting plate are fixed by screws, respectively, and reinforcing ribs are formed at least on both the left and right sides of the mounting bracket in front view. The mounting screw hole projects in the width direction with respect to the mass body of the mass .

  In the present invention of claim 1, in order to form the characteristic of the rubber elastic body of the rubber part in the range of tan δ from 0.01 to 0.7, the damping characteristic of the rubber part is set within the predetermined range. As a result, the vibration damping action can be exhibited even in a relatively wide frequency band. As a result, it is possible to reduce the weight impact sound, specifically, to ensure the heavy floor impact sound level class LH-60 defined in JIS A1418. In addition, it is possible to reduce the sound generated by the walking of the pedestrian.

The rubber part is formed by adhering the rubber elastic body and the mass mounting plate and bracket mounting plate above and below the rubber elastic body. Therefore, when the rubber elastic body is vulcanized, the mass mounting plate and the bracket mounting plate are molded. The rubber part can be easily manufactured because it can be vulcanized and bonded to the rubber only by being attached to the mold. Since the mass mounting plate and mass part, and the mounting bracket and bracket mounting plate are fixed with screws, the rubber part can be used as a common part, and the mass part and mounting bracket can be freely selected and used. The number can be easily adjusted.
Since the reinforcing ribs are formed at both the left and right ends of the mounting bracket when viewed from the front, the rigidity of the damper mounting plate increases and it becomes difficult to bend. Since the mounting screw hole of the bracket mounting plate projects in the width direction with respect to the mass body of the mass, the bracket mounting screw can be installed without being obstructed by the mass portion.

The present invention of claim 2 is attached to a pillar, beam or joist of a building, and comprises a dynamic damper comprising a rubber part having an elastic body and a mass part having a mass body, and the dynamic damper is installed in a building. In a building damping device composed of a mounting bracket attached to
The characteristic of the rubber elastic body of the rubber part is formed in the range of tan δ from 0.01 to 0.7. In addition to the mass mounting plate and the mass portion, and the mounting bracket and the bracket mounting plate being fixed by screws, reinforcing ribs are formed at both ends of the mounting bracket at least on the left and right sides of the front view. A vibration damping device for buildings, characterized in that a rubber part is installed inside.

In the present invention of claim 2, in order to form the characteristic of the rubber elastic body of the rubber part in the range of tan δ of 0.01 to 0.7, the damping characteristic of the rubber part is set within the predetermined range. As a result, the vibration damping action can be exhibited even in a relatively wide frequency band. As a result, it is possible to reduce the weight impact sound, specifically, to ensure the heavy floor impact sound level class LH-60 defined in JIS A1418. In addition, it is possible to reduce the sound generated by the walking of the pedestrian.
Rubber portion forming the rubber elastic body, since the upper and lower mass mounting plate and the bracket mounting plate of the rubber elastic body is formed by bonding the mass mounting plate and the bracket mounting plate when vulcanizing the rubber elastic body The rubber part can be easily manufactured because it can be vulcanized and bonded to the rubber only by being attached to the mold. Since the mass mounting plate and mass part, and the mounting bracket and bracket mounting plate are fixed with screws, the rubber part can be used as a common part, and the mass part and mounting bracket can be freely selected and used. The number can be easily adjusted.
Since the reinforcing ribs are formed at both the left and right ends of the mounting bracket when viewed from the front, the rigidity of the damper mounting plate increases and it becomes difficult to bend. Since the rubber portion is installed inside the reinforcing rib, the bracket mounting screw can be attached without being obstructed by the reinforcing rib.

According to the present invention of claim 4 , the adjustment of the spring constant of the mounting bracket is formed by bending a damper mounting plate for mounting a dynamic damper in the mounting bracket and a beam mounting plate for mounting on a column, beam or joist at a substantially right angle. This is a building vibration control device that adjusts by providing a reinforcing rib between the mounting plate and the beam mounting plate.

In the present invention of claim 4 , the spring constant of the mounting bracket is adjusted by bending a damper mounting plate for mounting a dynamic damper in the mounting bracket and a beam mounting plate for mounting on a column, beam or joist at a substantially right angle. Since adjustment is performed by providing reinforcing ribs between the mounting plate and the beam mounting plate, adjustment can be easily performed by changing the number, size, and thickness of the reinforcing ribs, and manufacturing is easy.

According to the fifth aspect of the present invention, the adjustment of the spring constant of the mounting bracket changes the width of the damper mounting plate for mounting the dynamic damper of the mounting bracket, and adjusts the distance between the dynamic damper and the pillar, beam or joist of the building. It is a vibration control device for buildings.

According to the present invention of claim 5 , the adjustment of the spring constant of the mounting bracket is performed by changing the width of the damper mounting plate for mounting the dynamic damper of the mounting bracket and adjusting the distance between the dynamic damper and the pillar, beam or joist of the building. Therefore, the adjustment can be easily performed only by changing the width of the damper mounting plate of the mounting bracket, and the adjustment is easy only by changing the dimensions without changing the material of the metal plate of the mounting bracket.

The present invention of claim 6 is the building damping device for adjusting the spring constant of the mounting bracket for adjusting the plate thickness of the sheet metal constituting the mounting bracket.

According to the sixth aspect of the present invention, the spring constant of the mounting bracket is easily adjusted by changing the plate thickness of the sheet metal constituting the mounting bracket in order to adjust the thickness of the sheet metal constituting the mounting bracket. Therefore, the shape of the vibration damping device for buildings is not greatly changed, and operations such as mounting to the building are easy.

According to a seventh aspect of the present invention, the building vibration control device is a building vibration control device mounted on a ceiling or a beam supporting a floor on the next upper floor or an abdomen of a joist.

In the present invention of claim 7, since the vibration damping device for a building is mounted on the beam or the abdomen of the joist that supports the ceiling or the floor of the next upper floor, it can effectively suppress floor vibration of a specific frequency. Since the dynamic damper is installed at the abdomen of the beam supporting the floor, the dynamic damper can be operated at the abdomen of the beam, which is the maximum amplitude part in the vibration mode. And the vibration control effect can be maximized.

The present invention according to claim 8 is the building vibration control device in which the building vibration control device is installed at a column, a beam, or a joist in the same state as a set of two.

In the present invention of claim 8 , since the same vibration damping device for a building is installed at a column, a beam, or a joist in the state of a set of two of the same, the state of the vibration control device for a building is a set of two By installing a plurality of columns, beams or joists, vibrations of the columns, beams, joists, etc. can be effectively suppressed. In addition, since the building vibration control device having the same specification is produced in large quantities, the manufacturing cost of the building vibration control device can be reduced. Furthermore, the mass of one building damping device can be set to a light value suitable for work, and the building damping device assembly work or the building damping device as a damping device can be set. It is possible to improve workability when mounting on a beam or the like.

According to the present invention, it is provided at a building pillar, beam, joist, and relates to a dynamic damper type vibration damping device for a building composed of a rubber part that forms an elastic body and a mass that forms a mass body. Since the structure of the rubber part forming the dynamic damper is set so that the value of tan δ falls within the range of 0.01 to 0.7, a column, a beam, a joist, etc. in a specific frequency range It became possible to effectively control the vibration.
The rubber part is formed by adhering the rubber elastic body and the mass mounting plate and bracket mounting plate above and below the rubber elastic body. Therefore, when the rubber elastic body is vulcanized, the mass mounting plate and the bracket mounting plate are molded. The rubber part can be easily manufactured because it can be vulcanized and bonded to the rubber only by being attached to the mold. Since the mass mounting plate and mass part, and the mounting bracket and bracket mounting plate are fixed with screws, the rubber part can be used as a common part, and the mass part and mounting bracket can be freely selected and used. The number can be easily adjusted.
Since the reinforcing ribs are formed at both the left and right ends of the mounting bracket when viewed from the front, the rigidity of the damper mounting plate increases and it becomes difficult to bend.

Embodiments of the present invention will be described with reference to the drawings. The present invention relates to a vibration damping device 1 for buildings that can be widely used for vibration damping not only for housing but also for buildings. In this embodiment, the vibration damping device for housing is taken as an example. I will explain to you.
First, a first embodiment will be described based on FIGS. 1 to 4 and FIGS. 8 to 11. As shown in FIG. 10, the building vibration control device 1 according to the present embodiment is attached to a beam of a steel-framed house, in particular, a small beam 5. As will be described later, it is preferable to attach to the abdomen which is the maximum amplitude part of the beam 5.

FIG. 1 is a plan view of a building damping device 1, FIG. 2 is a front view thereof, and FIG. 3 is a side view thereof. FIG. 4 is a schematic view in which the building vibration control device 1 is attached to the beam 5.
The building damping device 1 includes a dynamic damper 10 and a mounting bracket 40, and the dynamic damper 10 includes a rubber portion 30 having a rubber elastic body 32 and a mass portion 20 having a mass body.

  The mass body 21 of the mass portion 20 has a horizontally long and substantially rectangular parallelepiped shape, and is a metal lump as a whole in order to increase the mass. In order to change the natural frequency, the mass can be changed by adjusting the length in the lateral direction. Mounting screw holes 22 are formed at two locations on the lower surface of the mass body 21. As will be described later, a mass mounting screw 34 is inserted into the mounting screw hole 22 and fixed to the rubber portion 30. In the present embodiment, a mass value of 7 to 8 Kg can be adopted as the mass value of the mass portion 20 that forms the dynamic damper 10.

The rubber part 30 includes a rubber elastic body 32 having elasticity, a mass mounting plate 31 and a bracket mounting plate 33 bonded to the upper and lower sides of the rubber elastic body 32. The rubber elastic body 32 is formed in a substantially quadrangular prism shape, and the mass mounting plate 31 and the bracket mounting plate 33 are vulcanized and bonded when the rubber elastic body 32 is vulcanized.
The rubber elastic body 32 can be formed of butyl rubber. Other rubbers can be appropriately selected according to the vibration damping properties.

  The value of tan δ, which is a characteristic of the rubber elastic body 32 forming the dynamic damper 10, that is, the value of the vector phase difference (angle) between the dynamic spring constant and the loss spring constant of the rubber elastic body 32 is 0.01 to 0. .7 can be set. The value of tan δ is more preferably set within the range of 0.2 to 0.6. By limiting the characteristics of the rubber elastic body 32 within such a range, it becomes possible to exert a damping action in a wide frequency band. As a result, it is possible to reduce the weight impact sound, specifically, to secure the weight floor impact sound level class LH-60 defined in JIS A1418 and to reduce the sound generated by walking.

Next, the mass attaching plate 31 is formed in a substantially rectangular plate shape so that it can be brought into close contact with the vicinity of the center portion of the lower surface of the mass body 21 of the mass portion 20. An attachment screw hole 31 b is formed in the mass attachment plate 31 at a position corresponding to the attachment screw hole 22 formed in the mass body 21. A mass mounting screw 34 is inserted into the mounting screw hole 22 and the mounting screw hole 31 b to fix the mass portion 20. For this reason, the mass part 20 can be freely replaced, and the natural frequency can be adjusted so as to obtain a necessary frequency. Moreover, the rubber part 30 and the mass part 20 can be manufactured separately, and manufacture is easy.
A central protrusion 31c is formed on the opposite side of the central portion of the mass mounting plate 31 from the central beam. A through hole is formed in the central protrusion 31c, and a protective plate 36, which will be described later, is inserted into the through hole. Yes.

The bracket mounting plate 33 is formed in a substantially rectangular plate shape so that it can be in close contact with the mounting bracket 40. Projecting portions 33c are formed at two locations on the side opposite to the beam of the bracket mounting plate 33 so as to project laterally. A mounting screw hole 33b is formed in the protruding portion 33c. A bracket mounting screw 35 is inserted into the mounting screw hole 33 b and a damper screw hole 43 of the mounting bracket 40 described later, and the bracket mounting plate 33 is fixed to the mounting bracket 40. In addition, since the protrusion part 33c is formed in the bracket attachment plate 33, the bracket attachment screw 35 can be attached without being obstructed by the mass part 20.
A protection plate 36 is bent upward from the center of the bracket mounting plate 33 opposite to the beam. As described above, the protection plate 36 extends upward through the through-hole formed in the central projecting portion 31 c of the mass mounting plate 31 and can protect the mass portion 20.

  Next, the mounting bracket 40 will be described. As shown in FIG. 3, the mounting bracket 40 has a substantially L-shaped cross section, a side surface forms a beam mounting plate 41 to be mounted on the small beam 5, and an upper surface forms a damper mounting plate 42 to which the dynamic damper 10 is mounted. Inside the beam attachment plate 41 and the damper attachment plate 42 bent in an L shape, plate-like reinforcing ribs 45 are attached obliquely so as to be orthogonal to both surfaces of the beam attachment plate 41 and the damper attachment plate 42. In the first embodiment, the reinforcing ribs 45 are attached to the left and right ends and the central portion. The number of the reinforcing ribs 45 can be appropriately selected according to the required natural frequency. Further, the reinforcing rib 45 can be omitted depending on the required strength and natural frequency of the mounting bracket 40.

The damper mounting plate 42 of the mounting bracket 40 is formed in a planar shape, and a damper screw hole 43 is formed in a portion corresponding to the mounting screw hole 33b of the bracket mounting plate 33 described above. The bracket mounting plate 33 and the damper mounting plate 42 are in close contact with each other and are firmly fixed by the bracket mounting screw 35. As a result, the dynamic damper 10 and the mounting bracket 40 are integrated, and the building damping device 1 as a whole has a natural frequency. Further, as will be described later, the spring constant of the mounting bracket 40 can be adjusted by adjusting the dimension in the width direction of the damper mounting plate 42.
Further, the mounting bracket 40 can be freely replaced by the bracket mounting screw 35, and the natural frequency of the building vibration damping device 1 as a whole can be adjusted so as to obtain a necessary natural frequency.

The beam mounting plate 41 is formed integrally with the damper mounting plate 42 so as to be bent at a substantially right angle, and an appropriate number of beam screw holes 46 are formed so as to be mounted on the small beam 5.
When the building damping device 1 is attached to the beam 5, the beam mounting plate 41 is brought into close contact with the beam 5, and the building damping device 1 is small with a damper mounting screw 44 as shown in FIGS. 3 and 4. It is fixed to the beam 5. Thereby, the vibration of the house transmitted to the beam 5 from the floor 3 of the upper floor or the ceiling 3 of the lower floor can be reduced.

Further, as shown in FIGS. 10 and 11, the small beam 5 that supports the floor 2 is attached to the abdomen formed at the center of each of the maximum amplitude width portions. Thereby, the vibration of the small beam 5 can be reduced effectively.
In addition, as shown in FIG. 11, the building damping device 1 can be attached in a set of two. As a result, when adopting a configuration in which the same dynamic damper 10 is installed in a set of two pieces with a beam sandwiched between them, a small dynamic damper 10 having the same specifications and specifications is adopted. It becomes possible to produce in large quantities, and the manufacturing cost of the vibration damping device 1 for buildings can be reduced. As a result, the vibration control effect can be realized at low cost. Further, by setting the mass of one building damping device 1, particularly the weight of the mass portion 20 to a light value appropriate for work, it is possible to improve the installation workability of the building damping device 1. I can do it now.

Moreover, in the thing of this invention, since the damping device 1 for buildings can be attached to the small beam 5 etc. in a factory, it came to be able to ensure stability of quality.
In this case, vibration of columns, beams, joists, etc. can be effectively damped by the set of two vibration damping devices 1 for a building. Further, the mass of one building vibration control device 1 can be set to a light value suitable for work, and the work for assembling the building vibration control device 1 or attaching it to the small beam 5 or the like. It becomes possible to improve the performance.
In addition, although the two sets of vibration damping devices 1 for buildings have been described, the same effect can be obtained by attaching not only one set of two but also one building vibration damping device 1.

  In addition, when mounting the vibration damping device 1 for a building, it is installed at the position of the small beam 5 provided there over almost the entire surface in one unit forming the floor 2. In this embodiment, 12 units are provided per unit. In addition, it respond | corresponds by increasing / decreasing the number of the damping devices 1 for buildings to the thing of the specification from which a unit size differs. As a result, the impact vibration input to the floor surface can be effectively suppressed.

Next, the natural frequency of the building vibration control device 1 of the present embodiment will be described.
The value of the natural frequency (f1) of the dynamic damper 10 composed of the mass portion 20 and the rubber portion 30 is set to fall within the range of 44 Hz to 88 Hz. Note that the value of the natural frequency (f1) is preferably set within a range of 50 Hz to 70 Hz. And as a mass value of the mass part 20 which forms the dynamic damper 10, the thing of 7-8Kg is employ | adopted in this Embodiment.

  Further, as described above, the value of tan δ which is a characteristic of the rubber elastic body 32 of the rubber portion 30 forming the dynamic damper 10, that is, the vector phase difference between the dynamic spring constant and the loss spring constant of the rubber elastic body 32. The value of (angle) is set to fall within the range of 0.01 to 0.7. By setting to such a value, for example, 55 Hz can be obtained as the natural frequency of the dynamic damper 10.

  In the building vibration control device 1 in which the dynamic damper 10 having such a natural frequency (f1) falling within the range of 44 Hz to 88 Hz is fixed to the mounting bracket 40, the natural frequency of the building vibration control device 1 is the mounting frequency. As a whole, the building damping device 1 to which the bracket 40 and the dynamic damper 10 are fixed has two natural frequencies, that is, a natural frequency (f2) in the range of 89 Hz to 180 Hz and a natural frequency (f1) of the dynamic damper 10. Can have. Therefore, when this building damping device 1 is attached to a building, vibrations in these two frequency regions can be absorbed.

For example, as shown in FIG. 10, the building vibration damping device 1 having such a configuration is in a state of a set of two at the abdomen formed at the center of each of the small beams 5 that support the floor 2. To be installed with. In this case, as shown in FIG. 11, the building damping device 1 is installed on a small beam 5 provided on almost the entire surface in one unit forming the floor 2.
One building damping device 1 may be attached to one side of the beam 5 in accordance with the magnitude and frequency of vibration.

  In this embodiment, 12 units are provided per unit. In addition, it respond | corresponds by increasing / decreasing the number of the damping devices 1 for buildings to the thing of the specification from which unit size differs. As a result, the impact vibration input to the floor surface can be effectively suppressed. Each building vibration control device 1 attached to the small beam 5 that supports the floor 2 has specifications and specifications, that is, a natural frequency value (f1) and a characteristic of the rubber elastic body 32, tan δ. The dynamic damper 10 is set to have the same value. Accordingly, since the dynamic damper 10 having the same specification is produced in large quantities, the manufacturing cost of the dynamic damper 10 can be reduced, and the vibration damping action of the floor 2 can be realized at a low cost. Will be able to.

Next, the operation of the present embodiment having such a configuration when mounted on a house will be described. First, as shown in FIG. 10, the dynamic damper 10 having the same specifications and specifications is installed at the abdomen of the small beam 5 forming the floor 2. As a result, the vibration caused by the impact input to the floor of the upper floor is effectively damped by the operation of each dynamic damper 10.
Specifically, the natural frequency of the building damping device 1, that is, the natural frequency (f1) of the dynamic damper 10 and the natural frequency values when the dynamic damper 10 is fixed to the mounting bracket 40 are 55 Hz and 95 Hz, respectively. In addition, by setting the value of tan δ to 0.32, it is possible to significantly exhibit the vibration damping effect as compared with the case where there is no building vibration damping device 1. When looking at the measurement result at the sound pressure level under these conditions, the value of LH-60 can be satisfied in the weight floor impact sound level grade defined in JIS A1418.

  As described above, in the present embodiment, the dynamic damper 10 adjusted to a specific value is provided at the abdomen of each of the small beams 5 of one unit forming the floor 2, thereby raising the level by one. The vibration caused by the impact input to the floor can be efficiently suppressed, and the vibration caused by the impact can be prevented from propagating to the lower floor. As a result, in the present embodiment, a floor damping material having a heavy mass or a floor damping material provided between small beams is not necessary, and the ceiling damping material provided on the ceiling 3 of the lower floor is not necessary. No material or glass wool is required. Moreover, between the large beams 4, the vibration control material between the large beams provided in the conventional thing becomes unnecessary. As a result, the construction cost of the entire steel-framed house can be greatly reduced.

  The vibration absorption of the first embodiment will be described with reference to FIG. The natural frequency (f1) of the dynamic damper 10 of the first embodiment is set in the range of 44 Hz to 88 Hz as described above. On the other hand, the natural frequency of the mounting bracket 40 is set from 89 Hz to 180 Hz. Therefore, the building vibration damping device 1 of the first embodiment has two mountain vibration absorption portions each having a peak between 44 Hz to 88 Hz and 89 Hz to 180 Hz, as shown in FIG. 8. . For this reason, the 1st resonance frequency (F1) and 2nd resonance frequency (F2) of a house can be absorbed, and the vibration between 44 Hz and 180 Hz which are common in a house etc. can be absorbed widely and effectively.

  In this case, the same dynamic damper 10 is used in common. By changing the spring elasticity of the mounting bracket 40, the natural frequency (f2) can be set between 89 Hz and 180 Hz. Note that the natural frequency of the mounting bracket 40 can be increased by increasing the plate thickness of the mounting bracket 40 or increasing the strength and number of the reinforcing ribs 45, and vice versa. Can be reduced and can be adjusted.

Next, a second embodiment will be described with reference to FIG. In the second embodiment, the shape of the mounting bracket 40 is different from that of the first embodiment, and the dynamic damper 10 is the same as that of the first embodiment. Therefore, different parts will be described, and description of similar parts will be given. Is omitted.
The mounting bracket 40 of the second embodiment is formed so that the width of the damper mounting plate 42 is wide. Further, the reinforcing rib 45 is also omitted. As shown in FIG. 5, the dynamic damper 10 is attached to the end portion of the widely formed damper attachment plate 42. For this reason, the distance between the dynamic damper 10 and the small beam 5 is increased, the damper mounting plate 42 is easily bent, and the spring constant of the mounting bracket 40 is decreased. As a result, the building damping device 1 can have a frequency lower than the natural frequency of the dynamic damper 10, and can effectively absorb vibrations at a low frequency part.
In this manner, the natural frequency can be adjusted by changing the width and thickness of the damper mounting plate 42.

The vibration absorption of the second embodiment will be described with reference to FIG. The natural frequency (f1) of the dynamic damper 10 of the second embodiment is set within the range of 44 Hz to 88 Hz as described above. On the other hand, the entire natural frequency (f2) in which the dynamic damper 10 is fixed to the mounting bracket 40 is set to 20 Hz to 43 Hz. Therefore, the building vibration damping device 1 of the first embodiment has two mountain vibration absorption portions each having a peak between 44 Hz to 88 Hz and 20 Hz to 43 Hz, as shown in FIG. 9. . For this reason, vibration between 20 Hz and 88 Hz can be widely and effectively absorbed.
The dynamic damper 10 of the second embodiment is the same as the dynamic damper 10 of the first embodiment, and the mounting bracket 40 having a low natural frequency is used. A common mold and manufacturing process can be used, and the manufacturing cost can be reduced.

Next, a third embodiment will be described with reference to FIG. In the third embodiment, the shape of the mounting bracket 40 is different from that of the first embodiment, and the dynamic damper 10 is the same as that of the first embodiment. Therefore, different parts will be described, and description of similar parts will be given. Is omitted.
As shown in FIG. 6, the mounting bracket 40 of the third embodiment has a reinforcing rib 45 fixed to the tip of the damper mounting plate 42 and the tip of the beam mounting plate 41.
As described above, when the tip of the damper mounting plate 42, the tip of the beam mounting plate 41, and the reinforcing rib 45 are fixed, the cross section becomes a triangular shape, the rigidity of the damper mounting plate 42 increases, and the bending of the mounting bracket 40 becomes difficult. The spring constant increases. As a result, the building vibration control device 1 can have a natural frequency (f2) higher than the natural frequency of the dynamic damper 10, and can effectively absorb vibrations at a high frequency part.

The vibration absorption of the third embodiment will be described. The natural frequency (f1) of the dynamic damper 10 of the first embodiment is set in the range of 44 Hz to 88 Hz as described above. On the other hand, the natural frequency (f2) in a state where the dynamic damper 10 is fixed to the mounting bracket 40 is set to a frequency higher than that in the first embodiment between 89 Hz and 180 Hz. For this reason, the building vibration damping device 1 according to the third embodiment includes two mountain vibration absorption portions having peaks between 44 Hz to 88 Hz and 89 Hz to 180 Hz, respectively, as in the first embodiment. Will have. For this reason, vibration between 20 Hz and 180 Hz can be widely and effectively absorbed.
The dynamic damper 10 of the third embodiment is the same as the dynamic damper 10 of the first embodiment, and the mounting bracket 40 having a high natural frequency is used. A common mold and manufacturing process can be used, and the manufacturing cost can be reduced.

Even if the same dynamic damper 10 is used by changing the shape of the mounting bracket 40 as in the first to third embodiments, a building control system having various different natural frequencies can be used. The vibration device 1 can be obtained.
Further, the natural frequency (f1) of the dynamic damper 10 is set to 20 Hz to 43 Hz, and the natural frequency (f2) in which the dynamic damper 10 is fixed to the mounting bracket 40 is set to 44 Hz to 84 Hz to have a low vibration frequency. It can also absorb building vibration. Furthermore, the natural frequency (f1) of the dynamic damper 10 is set to 89 Hz to 180 Hz, and the natural frequency (f2) in which the dynamic damper 10 is fixed to the mounting bracket 40 is set to 44 Hz to 84 Hz to have a high vibration frequency. It can also absorb building vibration.

It is a top view of the vibration damping device for buildings of a 1st embodiment of the present invention. It is a front view of the vibration damping device for buildings of a 1st embodiment of the present invention. It is a side view of the vibration damping device for buildings of a 1st embodiment of the present invention. It is a schematic diagram which shows the state which mounted | wore the beam with the building damping device of the 1st Embodiment of this invention. It is a schematic diagram which shows the state which mounted | wore the small beam with the building damping device of the 2nd Embodiment of this invention. It is a schematic diagram which shows the state which mounted | wore the small beam with the building damping device of the 3rd Embodiment of this invention. It is a graph which shows the vibration absorption of the conventional damping device 1 for buildings. It is a graph which shows the vibration absorption of the damping device for buildings 1 of the 2nd Embodiment of this invention. It is a graph which shows the vibration absorption of the damping device for buildings 1 of the 3rd Embodiment of this invention. It is a perspective view which shows the arrangement | positioning state to the beam of the damping device for buildings of this invention. It is a conceptual diagram which shows the arrangement | positioning state to the floor surface of the damping device for buildings of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building damping device 5 Beam 10 Dynamic damper 20 Mass part 30 Rubber part 32 Rubber elastic body 40 Mounting bracket 45 Reinforcement rib

Claims (8)

A dynamic damper composed of a rubber part having an elastic body and a mass part having a mass body, and a mounting bracket for attaching the dynamic damper to the building. In a building vibration control device,
The characteristic of the rubber elastic body of the rubber part is formed so that the value of tan δ is in the range of 0.01 to 0.7,
The rubber part is formed by adhering a rubber elastic body and a mass mounting plate and a bracket mounting plate above and below the rubber elastic body, and the mass mounting plate, the mass part, the mounting bracket, and the bracket mounting plate are respectively Along with being fixed with screws,
Reinforcing ribs are formed at both left and right ends of the mounting bracket in front view, and mounting screw holes of the bracket mounting plate protrude in the width direction with respect to the mass body of the mass. Shaker. A dynamic damper composed of a rubber part having an elastic body and a mass part having a mass body, and a mounting bracket for attaching the dynamic damper to the building. In a building vibration control device,
The characteristic of the rubber elastic body of the rubber part is formed so that the value of tan δ is in the range of 0.01 to 0.7,
The rubber part is formed by adhering a rubber elastic body and a mass mounting plate and a bracket mounting plate above and below the rubber elastic body, and the mass mounting plate, the mass part, the mounting bracket, and the bracket mounting plate are respectively Along with being fixed with screws,
The building damping device according to claim 1, wherein reinforcing ribs are formed at both left and right ends of the mounting bracket in front view, and the rubber portion is installed inside the reinforcing rib. The building damping device according to claim 1 or 2, wherein the mounting bracket has a substantially L-shaped cross section. The adjustment of the spring constant of the mounting bracket is formed by bending a damper mounting plate for mounting the dynamic damper in the mounting bracket and a beam mounting plate for mounting on the column, beam or joist, at a substantially right angle, The vibration damping device for a building according to any one of claims 1 to 3 , wherein a reinforcing rib is provided between the beam mounting plate for adjustment. Adjustment of the spring constant of the mounting bracket, by changing the width of the damper mounting plate for mounting the dynamic damper of the mounting bracket, the dynamic damper and the building of the column, according to adjust the distance between the beam or joist The building damping device according to any one of claims 1 to 3 . The building damping device according to any one of claims 1 to 3, wherein the spring constant of the mounting bracket is adjusted by adjusting a plate thickness of a sheet metal constituting the mounting bracket. The said building damping device is a building damping device in any one of Claims 1 thru | or 6 with which the beam which supports the ceiling or the floor of the next upper floor, and the joist abdomen is mounted | worn. The building damping device according to any one of claims 1 to 7 , wherein the building damping device is installed in a state where two of the same are sandwiched between the columns, beams or joists.