JP3473979B2 - Floor vibration control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a lamp installed above a floor.
The vibrating body is attached to the floor via a spring for damping and supporting.
The present invention relates to a floor vibration damping device .

[0002]

2. Description of the Related Art For example, coil springs and leaf springs have been conventionally known as springs for damping and supporting incorporated in a damping device using an additional vibrating body. These coil springs and leaf springs are manufactured to have a predetermined spring constant, and the spring constant cannot be changed.

[0003]

Therefore, for example, when the above-mentioned conventional spring is incorporated in a vibration damping device as a spring for damping and supporting , the following disadvantages occur. In the vibration control device, it is necessary to match the vibration frequency of the additional vibration body with the natural frequency of the vibration suppression target.One of the vibration regulation methods is to measure the natural vibration of the vibration suppression target and There is a method of setting the spring constant of the spring for use as a spring constant that makes the frequency of the additional vibrating body the measured natural frequency.

On the other hand, in damping a building or floor, the natural frequency of a damping object such as a building or floor may be greatly different from the original design frequency due to design changes or manufacturing errors.

Therefore, in the vibration damping device in which the above-mentioned conventional spring is incorporated as a vibration damping / supporting spring, no inconvenience occurs when the natural frequency of the vibration damping target remains at the designed value. However, if the natural frequency of the vibration suppression target changes, if the spring constant based on the designed value of the natural frequency of the vibration suppression target remains, It cannot match the natural frequency of the object.

Therefore, waiting for the completion of the construction of the vibration damping object,
The natural frequency of the constructed damping object will be measured, and a spring with a spring constant corresponding to the measured natural frequency will be manufactured and installed.In this case, construction of the damping object is completed. Since we will be waiting for the production and installation of the spring,
This leads to a longer construction period. In addition, a plurality of springs with spring constants corresponding to the predicted natural frequencies of various types of vibration suppression objects are manufactured and prepared, and the measured natural frequencies of the vibration suppression object are calculated from these springs. It is possible to select and install a spring to be used based on this, but in this case, it is necessary to prepare a plurality of springs, and only one of the plurality of springs prepared in that way is used, Others become unnecessary, resulting in an extremely high cost.

In short, generally speaking, according to the conventional technique, the spring constant could not be changed. Therefore, in order to cope with the case where the required spring constant is changed, a spring having the changed spring constant is newly added. There was the inconvenience of having to make it.

An object of the present invention is to suppress vibrations in a floor vibration damping device.
Among the springs for swinging and supporting, it is a point to provide a spring constant variable spring capable of appropriately adjusting the spring constant.

[0009]

Ru good to the first aspect of the present invention of In order to achieve the object of the present invention
Features may use additional vibrating body damping and bearing disposed above the floor
Of the floor that is configured to be attached to the floor via the spring of
A vibration damping device, wherein the spring is provided with two magnets arranged in a state where magnetic poles of the same polarity face each other and are relatively movable in a far and near direction, and a relative movement direction of the two magnets. Is provided with a moving direction regulating means for regulating in a facing direction, and a separation regulating means for regulating a maximum separation distance between the magnets in a state in which the two magnets are allowed to move closer to each other,
Spring constant by adjusting the maximum distance by the spacing limiting means
The point is that adjustment means for changing the number is provided.

[0010] by that feature to the second aspect of the present invention, the first
In the invention, a means that also serves as a moving direction restricting means is provided as the separation restricting means.

[0011]

When the two magnets are arranged so that the magnetic poles of the same polarity face each other, a magnetic repulsive force is generated between the two magnets. Utilizing the above, the two magnets are arranged so that the magnetic poles of the same polarity face each other so that they can move relatively far and far in the facing direction. The magnetic repulsive force between the two magnets acts as a spring repulsive force, and the two magnets function as a compression spring.

Moreover, as shown in FIG. 3, the magnitude of the magnetic repulsive force between the magnets is inversely proportional to the separation distance between the two magnets, and the relationship between the magnitude of the magnetic repulsion force and the separation distance is non-linear.
That is, the spring constant due to the magnetic repulsive force of the magnet increases in inverse proportion to the separation distance of the magnet. As a result, in the spring utilizing the magnetic repulsive force, the spring constant can be changed by changing the separation distance between the two magnets. By utilizing the above, the maximum separation distance of the two magnets regulated by the separation regulation means can be adjusted by the adjusting means. Therefore, by adjusting the maximum separation distance, the separation distance becomes the maximum separation distance. The spring constant in the state can be changed. Specifically, the smaller the maximum separation distance, the larger the spring constant in the state where the separation distance is at the maximum separation distance.

In particular, according to the second aspect of the present invention, it is possible to reduce the number of constituent members by sharing the constituent members between the separation regulating means and the moving direction regulating means.

[0014]

Therefore, according to the present invention, the spring constant can be changed by a simple operation of adjusting the maximum separation distance between the two magnets, that is, the spring constant can be easily adjusted to a required value. It can be adjusted quickly, and in particular, the required spring constant cannot be accurately known until after the construction of the object to be damped.The variable spring constant is useful as a spring for damping and supporting the floor damping device. You can now provide a spring.

Particularly, when the second aspect is adopted, the structure can be simplified.

[0016]

[Example] An example of application to a vibration damping device that controls vertical vibration of the floor due to walking or the like will be described. As shown in FIG. 1, the vibration damping device has an additional vibrating body B arranged above the floor A, and the additional vibrating body B is placed on the floor A vertically and in the opposite direction as the floor A vertically vibrates. It is configured such that it is mounted in a vibrating state via a spring C for damping and supporting. That is, by adjusting the spring constant of the spring C, the vertical frequency of the floor A is suppressed by matching the frequency of the additional vibrating body B with the natural frequency of the floor A.

The spring C has a variable spring constant and is provided with two magnets 1A and 1B, a moving direction restricting means, a separation restricting means, and an adjusting means.

The magnets 1A and 1B are permanent magnets, and one magnet 1A is fixed to the upper surface of the floor A,
The other magnet 1B is fixed to a portion of the lower surface of the additional vibrating body B facing the one magnet 1A in the vibration direction (vertical direction). That is, the two magnets 1A and 1B move relative to each other in the vibration direction with the relative vibration between the floor A and the additional vibrating body B. Moreover, the two magnets 1A and 1B are attached such that magnetic poles having the same polarity face each other. That is, if the magnetic poles of the opposing portions of one magnet 1A are S (or N) poles, the magnetic poles of the opposing portions of the other magnet 1B are also attached so that they have the same S (or N) poles. Between the magnets 1A and 1B, that is,
It is configured to generate a magnetic repulsive force that tends to move the floor A and the additional vibrating body B away from each other, and function as a compression spring.

The moving direction restricting means is a means for restricting the relative moving direction of the two magnets 1A and 1B to the opposite direction, that is, the vibrating direction of the additional vibrating body B.

The separation regulating means is composed of the two magnets 1.
Magnets 1A and 1B in a state where A and 1B are allowed to move toward each other.
A means for limiting the maximum separation distance DMAX between Bs,
A pull member 2 in a vertical posture such as a rod is provided movably up and down with respect to the floor A and the additional vibrating body B, and a lower end portion of the pull member 2 is brought into contact with the floor A from below to pull the pull member of the floor A. A lower stopper 3 for preventing downward movement with respect to 2 is fixed, and an additional vibrator B is attached to the upper end of the tension member 2.
And an upper stopper 4 for abutting from above to prevent the additional vibrating body B from moving upward with respect to the tension member 2. That is, the pulling member 2 is configured to prevent the additional vibrating body B from moving away from the floor A due to the repulsive force of the magnets 1A and 1B, thereby limiting the maximum distance DMAX between the magnets 1A and 1B. There is.

The adjusting means is a means for adjusting the maximum separation distance DMAX by the separation restricting means, and is constructed by mounting the upper stopper 4 on the pulling member 2 so as to be vertically position changeably fixed. . That is, by changing the position of the upper stopper 4 with respect to the tension member 2 up and down and changing the vertical position of the upper stopper 4 with respect to the lower stopper 3, the additional vibrating body B with respect to the floor A is
The maximum separation distance DMAX between the magnets 1A and 1B is adjusted by changing the maximum separation distance of the magnets 1A and 1B. A means for changing and fixing the position of the upper stopper 4 is formed by forming a male screw on the tension member 2 and adding a nut 5 which is screwed to the nut 5 and moves in the longitudinal direction (vertical direction) of the tension member 2 to the upper stopper 4. This is means for adjusting the position of the upper stopper 4 by moving the nut 5 provided while being pressed against the vibrating body B.

Then, as shown in FIG. 2, the separation regulating means are provided at the four corners of the additional vibrating body B, and the pulling members 2 of the respective separation regulating means are inserted into the vertical through holes formed in the additional vibrating body B. The tension member 2 as a guide, and
The tension member 2 of the additional vibrating body B using the through hole as a guide hole
The horizontal movement with respect to the (floor A) is restricted to move the additional vibrating body B only in the vertical direction. In other words, the separation regulation means also serves as the movement direction regulation means.

As shown in FIG. 3, the magnetic repulsion force P of the magnets 1A and 1B increases in inverse proportion to the separation distance D of the magnets 1A and 1B, and the relationship between the magnetic repulsion force P and the separation distance D is shown. It is non-linear. Therefore, by controlling the maximum separation distance DMAX of the magnets 1A and 1B and adjusting the maximum separation distance DMAX, the spring constant k1 can be adjusted when the separation distance D is at the maximum separation distance DMAX. .

The force balance equation between the magnets 1A and 1B is P = 2T, where P is the repulsive force of the magnets 1A and 1B and T is the tension of the tension member 2. Then, the spring constant k2 when the tension of the tension member 2 is introduced is constant, and the equivalent spring constant k as one spring satisfying the above-described equilibrium expression is represented by k = k1 + k2. Therefore, the equivalent spring constant k Is the distance D
It will change depending on the value of. As a result, magnet 1
The equivalent spring constant k can be changed by adjusting the maximum separation distance DMAX between A and 1B.

In the above-mentioned embodiment, since the separation regulating means also serves as the movement direction regulating means, the magnets 1A,
The structure around 1B can be simplified and the whole structure can be simplified. Moreover, the magnets 1A and 1B are used as the separation regulating means.
There is provided a floor A and an additional vibrating body B to which the magnets are mounted, that is, generally speaking, a member that restricts the maximum distance DMAX between the magnets 1A and 1B by restricting the distance between the members to which the springs are mounted. Therefore, as compared with the case where the maximum separation distance DMAX is restricted by directly acting on the magnets 1A and 1B, the structure for incorporating the constituent members of the separation restricting means such as the tension member 2 is easier to construct.

[Other Embodiments] In the above embodiment, the separation direction controlling means also serves as the moving direction controlling means.
As shown in FIG. 4, a guide G for guiding relative movement of the magnets 1A and 1B is provided separately from the tension member 2 that constitutes the separation regulating means, and the movement regulating means is configured separately from the separation regulating means. You may.

In the above-mentioned embodiment, the relative movement of the pulling member 2 with respect to the additional vibrating body B allows the additional moving body B to move closer to the floor A. The elastic member B may be made of a flexible material so that the additional vibrating body B is allowed to move toward the floor A by the bending of the tension member 2. In short, the means for permitting the magnets 1A and 1B to approach each other by the separation restricting means can be appropriately changed.

In the above-mentioned embodiment, the maximum distance between the magnets 1A and 1B is controlled by controlling the distance between the additional vibrating body B and the floor A, that is, the distance between the members to which the magnets 1A and 1B are attached, as the distance controlling means. Although the one that regulates the distance DMAX has been shown, the separation regulating means directly acts on the magnets 1A and 1B themselves to thereby determine the maximum separation distance DMA of the magnets 1A and 1B.
It may regulate X.

In the above embodiment, the permanent magnets are shown as the magnets 1A and 1B, but the magnets 1A and 1B may be electromagnets.

[0030]

In the above embodiment, the vibration damping device without the damper for damping the vibration is shown.
When constructing a vibration control device for floors, buildings, stairs, bridges, etc., various dampers such as viscous dampers and friction dampers are interposed between the vibration control target such as floor A and the additional vibration body B. You may implement so that a vibration may be attenuated.

In the above-mentioned embodiment, a spring provided with a pair of magnets 1A and 1B is shown, but a plurality of pairs of magnets 1A and 1B are used.
1B may be provided to form one spring. in this case,
The magnets 1A and 1B corresponding to each other need to be arranged such that the magnetic poles of the same polarity are opposed to each other, but the polarities of the opposed magnetic poles of all the pairs of magnets 1A and 1B are the same, for example, In the pair of magnets 1A and 1B, the magnetic poles of the N poles face each other, and in the magnets 1A and 1B of the other pair, the magnetic poles of the S poles face each other. Any configuration that is not the same may be adopted.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cutaway front view showing an embodiment.

FIG. 2 is a plan view showing an embodiment.

FIG. 3 is a graph showing the relationship between the magnet separation distance and the magnetic repulsion force.

FIG. 4 is a cutaway front view showing another embodiment.

[Explanation of symbols]

1A magnet 1B magnet A floor B additional vibrating body C spring DMAX maximum separation distance

Continuation of front page (72) Inventor, Ji Ji ▲ Kai ▼ 4-13-1, Honmachi, Chuo-ku, Osaka City, Osaka Prefecture Takenaka Corporation, Osaka Main Store (56) Reference JP-A-63-135629 (JP, A) ) JP-A-7-145838 (JP, A) JP-A-61-201944 (JP, A) Actually open 59-83151 (JP, U) Actually open 64-48445 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F16F 6/00 E04H 9/02 341 F16F 15/00-15/08

Claims (2)

(57) [Claims] 1. An additional vibrating body arranged above a floor (A).
(B) is on the floor (A) via the spring (C) for damping and supporting
A floor vibration damping device configured by being attached, wherein the spring (C) is arranged in a state in which magnetic poles having the same polarity face each other and is relatively movable in a far and far direction.
The two magnets (1A) and (1B) are provided, and the moving direction restricting means that restricts the relative moving directions of the two magnets (1A) and (1B) to the opposite directions is provided.
(1B) The magnet (1
A) and (1B) are provided with separation regulating means for regulating the maximum separation distance (DMAX) between the floors, and a floor provided with adjusting means for adjusting the maximum separation distance (DMAX) by the separation regulation means to change the spring constant. Damping device . 2. The floor vibration damping device according to claim 1, wherein a means that also serves as a moving direction restricting means is provided as the separation restricting means.
Place