JP2010180669A - Damping unit and installation structure for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To meet the long-period oscillation of an earthquake or the like without the need for a large space. <P>SOLUTION: There are provided a damping unit body 3 which can be freely installed in a building to be under seismic control, and a mass body 5 which is rotatably supported around a vertical axis Z in the damping unit body 3. The mass body 5 is arranged in a state where its gravity center W is shifted from the vertical axis Z. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration control unit, and relates to a vibration control unit installation structure in which a plurality of vibration control units are installed in a vibration control target building.

Conventionally, as this type of vibration control unit technology, for example, as a vibration reduction technology for OA floors, etc., it is installed in a narrow space under the floor so that vertical vibrations generated by walking etc. can be reduced. There was a thing (for example, refer to patent documents 1).
As shown in FIG. 5, a rectangular plate-like mass 5 is provided in a flat frame 20 having a flat rectangular shape and a small height so as to be able to swing up and down. A damper 21 that provides resistance to the frame 20 and the mass 5 is provided.
When vertical vibrations are applied by walking on the floor, the mass 5 swings up and down, and a mechanism for reducing vibrations by shifting the vibration period by the damper 21 is provided.
In addition, there were a pendulum type and a built-in damper in the wall brace installation part.

JP 2006-342879 A

Building vibration control technology is broadly classified into two types, one for floor vertical movement and the other for horizontal movement of the entire building. The present invention is a vibration control mechanism for horizontal movement of an entire building.
There are two types of vibration control for the horizontal movement of the entire building: one that tries to improve the loss of habitability due to wind, and one that absorbs energy during an earthquake. Since the amplitude required for the latter greatly exceeds the amplitude required for the former, they are currently separate technologies, but the present invention is not limited by amplitude and can therefore handle any disturbance horizontal movement. It is a vibration control mechanism.
The conventional seismic control unit technology described above is a technology corresponding to vibration control of minute amplitude and short cycle, which is the vertical movement of the floor, and this is applied to vibration of large amplitude and long cycle like horizontal motion of a building. It could not be applied to the mechanism.
In the building, the primary natural period becomes longer as the height becomes higher, such as middle, high, and super-high. When a disturbance such as an earthquake or wind acts on a building with a long natural period, each layer slowly sways horizontally with a large amplitude, but if such large amplitude and long period vibrations are targeted, the damping device itself Must correspond to a long period and the mass amplitude must be sufficiently large.
There is a pendulum type vibration control mechanism that tries to improve the deterioration of the habitability due to the wind, but the existing devices have become large-scale in order to synchronize the natural period of the pendulum with the natural period of the building. . Since the pendulum period is proportional to the square root of the pendulum suspension length, the longer the period of the building, the greater the suspension length required, making it difficult to make the damping mechanism compact. In addition, since the necessary amplitude cannot be secured sufficiently, the pendulum type vibration control device is limited to the purpose of improving habitability (since the mass is locked during an earthquake, it is useful for absorbing earthquake energy). Do not do).
Hysteresis dampers that absorb energy by plasticizing metals such as steel dampers and dampers that use viscous damping such as oil dampers are practically used as damping mechanisms that attempt to absorb energy during earthquakes. However, all of these require specific braces and upper layers to be connected by dampers to resist relative interlayer deformation between the upper and lower floors. It is necessary to incorporate in a vertical member. Therefore, the part becomes a partition, and the degree of freedom of design for freely obtaining a large room without pillars is reduced. At the same time, the device becomes large-scale and it is difficult to make it compact.
In the case of vibration control for vertical vibrations such as OA floors, it has a shorter period than an earthquake and has a small amplitude, so it can be made compact enough to be installed in a narrow space under the floor. However, in order to make this structure effective against horizontal vibration due to an earthquake, it is necessary to set the vibration of the mass in the horizontal direction and set the vibration to a long period and a large amplitude. It becomes a thing.
Thus, according to each conventional vibration control unit technology described above, it has been difficult to cope with horizontal vibrations of buildings due to earthquakes and the like while achieving compactness.

  Accordingly, an object of the present invention is to provide a compact seismic control unit technology capable of solving the above-described problems and adapting to horizontal vibrations of buildings due to earthquakes and the like without taking up space.

  A first characteristic configuration of the present invention is provided with a vibration control unit main body that is attachable to a vibration control target building, and a mass body that is rotatably supported around a longitudinal axis in the vibration control unit main body. The mass body is provided in a state where its center of gravity is eccentric from the longitudinal axis.

According to the first characteristic configuration of the present invention, since the mass body is supported so as to be rotatable around the longitudinal axis, when a horizontal external force (for example, vibration due to earthquake) acts on the vibration control unit, The inertial force received by the mass body acts as a moment around the vertical axis, and causes the mass body to rotate. Thus, by converting the energy of vibration disturbance due to translation into rotational motion, it is possible to absorb the seismic energy.
In addition, the period of vibration to be targeted is, for example, by changing the eccentric amount of the mass body and the longitudinal axis to adjust the rotation radius, or by using a spring or the like that delays the rotation of the mass body, From a short period vibration to a long period vibration, a vibration damping effect can be expected in accordance with an arbitrary period.
Therefore, the vibration control effect can be exhibited even in the horizontal vibration of the building due to an earthquake or the like. In particular, when a means for delaying the rotation cycle is used in combination, it is possible to cope with long-period vibration without increasing the rotation radius of the mass body, and thus the vibration control unit can be made compact in a plane.
Moreover, since the height dimension of the vibration control unit is not related to the direct vibration control effect, there is freedom in design, and for example, it can be formed in a thin flat shape. As a result, the vibration control unit can be installed even in a narrow space such as an underfloor space or a ceiling space.
Thus, in addition to being able to achieve compactness as a single vibration control unit, the greater the number of vibration control units to be installed, the greater the vibration control effect can be exhibited.

  According to a second characteristic configuration of the present invention, there is provided a repelling means for applying a restoring force to the rotational motion of the mass body around the longitudinal axis.

According to the second characteristic configuration of the present invention, since the repulsive means for applying a restoring force to the rotational motion around the longitudinal axis of the mass body is provided, the rotational cycle of the mass body can be extended. Thus, it becomes possible to cope with long-period vibration without increasing the substantial radius of rotation of the mass body.
As a result, it is possible to reduce the size of the vibration control unit while being able to cope with the horizontal vibration of the building due to an earthquake or the like. Therefore, the selectivity of the installation location of the vibration control unit for the building can be improved.

  According to a third characteristic configuration of the present invention, there is provided resistance means for applying a braking force to the rotational motion around the longitudinal axis of the mass body.

  According to the third characteristic configuration of the present invention, the damping effect by the resistance means can be exhibited, and vibration damping can be realized more strongly.

The fourth characteristic configuration of the present invention is a vibration control unit installation structure in which a plurality of vibration control units having any one of the first to third characteristic configurations are installed in the building to be controlled.
Each seismic control unit is installed such that the initial position of the mass body with respect to the longitudinal axis is at least two types for each seismic control unit.

In order for the mass body to rotate around the vertical axis when a vibration having a lateral vector acts on the vibration control unit, the vibration needs to generate a couple of forces between the mass body and the vertical axis. There is. That is, when the vibration vector is along a straight line connecting the center of gravity of the mass body and the vertical axis, the mass body does not rotate because the couple is not generated.
According to the fourth characteristic configuration of the present invention, each damping unit is installed so that the initial position of the mass body with respect to the longitudinal axis is at least two types for each damping unit. Regardless of the vector in which direction the vibration acting on the seismic unit is, the couple acts on any seismic control unit, and the mass body rotates around the vertical axis. Therefore, it is possible to reliably achieve vibration damping for the vibration control target building by any one of the vibration control units.

Sectional view showing the installation state of the vibration control unit Plan view of damping unit Sectional view along section III-III in Fig. 2 Plan view showing the structure of the control unit Sectional view showing a conventional vibration control unit

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts denoted by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

  FIG. 1 shows a situation where an embodiment of the vibration control unit of the present invention is installed in a vibration control target building B.

  The vibration suppression target building B is configured to be installed in a state where a plurality of the vibration control units 1 are laid down in an underfloor space.

  As shown in FIGS. 1 to 3, the vibration control unit 1 includes a case 3 (corresponding to a vibration control unit main body) that can be attached to the slab 2, a vertical axis 4 that is erected in the case 3, A mass (corresponding to a mass body) 5 supported so as to be rotatable around a vertical axis Z of the vertical axis 4 is provided.

The case 3 is configured as a flat box having a square shape in plan view.
The material is preferably a material having high shape retention, such as metal, synthetic resin, or wood. In this embodiment, it is installed in the space under the floor and does not receive the floor load, but it is also possible to adopt an installation correspondence that receives the floor load, in which case the floor load is supported. The strength that can be done is required.
The attachment to the slab 2 is not shown in the figure, but can be carried out with, for example, a bolt or an adhesive. If sufficient frictional force can be expected on the floor and the bottom of the vibration control unit, the vibration control effect can be expected by simply placing it.

The vertical axis 4 is fixed so as to stand on a center point of a square across the bottom plate 3 a and the top plate 3 b of the case 3.
The material is made of metal, and the mass 5 is fitted on the vertical axis 4 so as to be rotatable around the vertical axis Z.

The mass 5 is made of a material having a large specific gravity, such as a metal, and includes a fitting portion 5a fitted on the longitudinal axis 4 at the base end portion and a weight portion 5c at the distal end portion. The arm portion 5b that integrally connects the fitting portion 5a and the weight portion 5c is provided.
The center of gravity W of the mass 5 is formed so as to be positioned at the weight portion 5c. Therefore, when the mass 5 is externally fitted to the vertical axis 4, the center of gravity W is eccentric from the vertical axis Z, and when a lateral external force such as an earthquake acts, the mass 5 and the vertical axis 4 A moment acts between them, and accordingly, the mass 5 rotates around the vertical axis Z, and vibration energy can be converted into rotational energy and absorbed.
The shape of the mass 5 is devised so that the position of the center of gravity is sufficiently decentered from the axis of the vertical axis and the moment of inertia is as large as possible with the same weight.

Further, a helical spring (corresponding to a repulsion means) 6 is attached over the mass 5 and the vertical axis 4, and the helical spring 6 can exert a restoring force on the rotational movement of the mass 5. It is configured to be able to.
Therefore, even if the length of the arm portion 5b is short, the rotational period of the arm portion 5b can be extended by the restoring force of the helical spring 6, and, for example, vibration suppression for long-period vibration such as an earthquake. It is possible to exert an effect.

On the other hand, the weight portion 5c is formed so as to contact the bottom plate 3a of the case 3, and a frictional force acts between the weight portion 5c and the bottom plate 3a. Therefore, with the rotation of the mass 5, this frictional force acts as a braking force and can exhibit a damper effect.
Thus, the said weight part 5c and the baseplate 3a currently formed in the state to which a frictional force acts are called the resistance means 7. FIG.

When installing the vibration control unit 1, as shown in FIG. 4, the direction of the straight line L connecting the vertical axis Z and the center of gravity W of the mass 5 is not the same in all the vibration control units 1. The rest position of the vibration control unit 1 is set. In order for the mass 5 to rotate along with the vibration of the earthquake, a moment needs to be generated between the mass 5 and the vertical axis 4 as described above, but when the vibration direction of the earthquake and the straight line L are along Since the moment does not occur, the mass 5 does not rotate. Accordingly, the initial position of the mass 5 is set so that any one of the installed vibration control units 1 can operate regardless of which direction of vibration is applied.
In the present embodiment, the initial state is set so that the initial position of the mass 5 with respect to the longitudinal axis Z, that is, the direction of the straight line L, is at least two types in all installed vibration control units 1. Has been. Specifically, the direction of the straight line L is set to be random in each vibration control unit 1.

According to the vibration damping technology of this embodiment, vibration energy can be converted into rotational energy of the mass 5 to absorb energy, and the rotational period of the mass 5 can be extended by adjusting the helical spring 6 and the mass amount. Therefore, the vibration control effect corresponding to the horizontal vibration of the building due to an earthquake or the like can be exhibited while the vibration control unit 1 is made compact. Moreover, the damper effect by the said resistance means 7 can also be exhibited, and vibration damping can be implement | achieved more strongly.
The vibration control unit 1 can be reduced to a three-dimensional compact size. For example, the vibration control unit 1 can be installed in a small space such as under the floor or behind the ceiling of the vibration control target building B. The selectivity of the installation location of the vibration control unit 1 can be improved.

[Another embodiment]
Other embodiments will be described below.

<1> The vibration control unit 1 is not limited to the shape described in the previous embodiment. For example, instead of being configured as a flat box having a square planar shape, the planar shape is circular or rectangular. Various measures can be taken.
Moreover, it is not restricted to a flat shape, For example, you may form so that appearance may become a column shape. When the columnar damping unit 1 is formed, a plurality of the flat shaped damping units 1 described in the previous embodiment are stacked in addition to the columnar shape formed by the single damping unit 1 itself. You may comprise so that it may become.
As described above, since the shape setting of the vibration control unit 1 itself can be freely performed, the installation target location of the vibration control unit 1 is not limited to the underfloor space or the ceiling space described in the previous embodiment, It can be set freely according to the shape of the vibration control unit 1.
<2> The repulsion means 6 is not limited to the helical spring described in the previous embodiment, and may be configured by using, for example, another type of spring or another elastic body. Further, the repulsion means may be configured so as to apply a braking force to the rotational motion of the mass body 5 by utilizing the repulsive force of the magnetic force. In short, it is sufficient if it can extend the rotation period of the mass body 5, and these are collectively referred to as repulsion means.
In addition, when a helical spring is used as the repulsion means 6, the installation direction of the helical spring is changed to the same direction in all the vibration control units, and the vibration control is performed by reversing the installation direction of the helical spring. Units may also be mixed.
<3> The resistance means 7 is not limited to the one that generates a resistance force by the friction between the bottom plate 3a and the weight portion 5c described in the previous embodiment. For example, the sliding friction between the vertical axis 4 and the fitting portion 5a. May be used, or the case 3 may be filled with a viscous liquid so that the viscous liquid becomes a resistor in the rotational movement of the mass body 5. In short, any means may be used as long as a braking force is applied to the rotational motion around the longitudinal axis Z of the mass body 5, and these are collectively referred to as the resistance means 7.
<4> The vibration control unit body 3 is not limited to being configured as a case in which the entire outer periphery is covered as in the previous embodiment. For example, the vibration control unit body 3 is configured by a frame. There may be.
The material can also be freely selected within a range in which appropriate performance can be obtained as a vibration control unit.
Further, when the vibration control unit main body 3 is configured as a case where the entire outer periphery is covered, if the display means for indicating the position of the mass body 5 around the vertical axis Z is provided, the mass body 5 of the vibration control unit 1 is provided. This makes it easy to manage the initial position of the mass body 5 at the time of installation.
Incidentally, this display means is, for example, a method in which a part or all of the case is formed so as to be seen through, or an indicator that rotates integrally with the mass body 5 is provided in a state that can be confirmed from the outside. Can be realized.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

1 Seismic control unit 3 Case (equivalent to seismic control unit body)
5 mass (equivalent to mass body)
6 helical spring (equivalent to repulsion means)
7 Resistance means B Damping target building W Center of gravity Z Vertical axis

Claims (4)

  A seismic control unit body that can be attached to a building subject to seismic control, and a mass body that is supported so as to be rotatable about a longitudinal axis in the seismic control unit body, the mass body having a center of gravity. A seismic control unit provided in an eccentric state from the longitudinal axis.   The seismic control unit according to claim 1, further comprising a repulsion unit that applies a restoring force to a rotational motion around the longitudinal axis of the mass body.   The vibration control unit according to claim 1, wherein a resistance unit that applies a braking force to a rotational motion around the longitudinal axis of the mass body is provided. A plurality of the damping units according to any one of claims 1 to 3, wherein the damping unit installation structure is installed in the building to be controlled,
A seismic control unit installation structure in which each seismic control unit is installed so that there are at least two types of initial positions of the mass body with respect to the longitudinal axis.

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