JPH08200438A - Anti-sway device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is easy to set the natural period of the vibration suppressor to match the natural period of the structure, and reduce the loss of the vibration suppression effect due to excessive vibration of the vibration suppressor. [Structure] On a structure 1, a rail plate 2 which is curved so that its central portion bulges downward is fixed. The damping body 4 is movably mounted on the rail plate 2 via wheels 5. Rail plate 2
Set up stoppers on both ends in the longitudinal direction. The magnets 11a and 11b are attached to the opposing surfaces of the stopper and the vibration damper 4. The magnets 11a and 11b are arranged so that the facing surfaces have the same magnetic pole. The adjustment of the natural period is selected by the curvature of the rail plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-sway device which is attached to any structure, such as a building, a bridge, a ship, a gondola, etc., for land use and marine use, and is used for suppressing the shake of these structures. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a structure of a structure for preventing shaking of a structure is shown in FIG. b is laid and a vibration damping body (weight) is provided on the rail b.
c is movably mounted via wheels d, and the damping body c
And a bracket e that is erected on one side of the vibration damping body c,
A spring f for adjusting the natural period of the vibration suppressor c to the natural period of the structure a and a hydraulic damping device h for preventing excessive vibration of the vibration suppressor c due to the vibration of the structure a are interposed. There is known a configuration in which the vibration of the structure a is attenuated by the repeated movement of the vibration damping body c. i indicates a stopper.

[0003]

However, in the case of the above-described conventional anti-sway device, the spring f as a mechanical component is used to match the natural period of the structure a with the natural period of the damping body c. Therefore, not only is it difficult to set the natural period, but it is not possible to cope with a case where the movement stroke of the vibration damping body c is large, and therefore it is not suitable for a large stroke, and the damping device h Since the damping force is constant and cannot be variably adjusted, if the vibration damping body c shakes too much, it will collide with the stopper i, resulting in a large loss in the damping effect.

Therefore, according to the present invention, the natural period can be easily set, a large stroke can be easily realized, and further, it is possible to prevent the damping body from colliding with the stopper and reduce the loss of the anti-sway effect. The present invention is intended to provide an anti-sway device.

[0005]

In order to solve the above-mentioned problems, the present invention has end face plates at both longitudinal ends of a rail plate curved so that a central part thereof bulges downward on a structure to be shake-prevented. Is fixedly installed, a damping body is movably mounted in the longitudinal direction on a rail plate of the frame, and magnets are attached to the inner surfaces of the end plates at both ends of the frame, and A magnet is attached to the damping body so as to face the magnet of the end plate and have the same magnetic pole.

Further, instead of attaching the magnets to the end plates and both end portions of the vibration damper, a shock absorber may be attached to either one of the end plate and both end portions of the damper.

[0007]

When the structure shakes, the frame is rocked together with the structure, and the rocking energy is converted into the kinetic energy of the vibration suppressor along the rail plate, thereby suppressing the rocking of the structure. To be At this time, by properly selecting the curvature of the rail plate, the natural period of the vibration damper is matched with the natural period of the structure. Further, even when the vibration damping body shakes significantly, the repulsive force of the magnet prevents the collision of the vibration damping body with the both end face plates of the rail plate which serve as stoppers.

Further, when the shock absorber is provided on either one of the end plate and both end faces of the vibration control body, even if the vibration control body collides with the end face plate, the impact force at that time occurs. Will be buffered by the buffer.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention, in which an arcuate rail plate 2 curved with a required curvature is formed on the top of a structure 1 to be shake-stopped, such as a building. The structure 1 is installed and fixed via a support frame 3 in a direction in which the structure 1 is swayed in a direction in which the vibration of the structure 1 occurs, and a damping body (weight) 4 is mounted on the rail plate 2 by a rail. The rail 5 is placed so as to be movable along the longitudinal direction of the rail plate 2 via wheels 5 adapted to roll on the plate 2, and
On the rail plate 2, the left-right direction (arrow X
End plates 6 serving as stoppers for preventing the vibration damping body 4 from swinging, and side plates 7 at both front and rear ends along the longitudinal direction of the rail plate 2, respectively. The upper surface of the space surrounded by the side plate 7 and the both end surface plates 6 is the upper plate 8.
The frame 9 is formed so as to be closed with the frame 9, and the movement space of the vibration damping body 4 is formed in the frame 9, and the frame 9 is formed at the left and right side end portions of the front and rear sides of the vibration damping body 4. The side roller 10 is provided so as to roll in contact with the inner surfaces of the front and rear side plates 7, and when the structure 1 shakes, the damping body 4 causes the wheel 5 and the side roller 10 to roll to roll the frame. It is a passive type anti-sway device that can be repeatedly moved in the longitudinal direction on the rail plate 2 inside 9.

Further, as a collision prevention device, the opposite magnetic poles are provided on the inner surface of the end plate 6 and the both end faces of the vibration damper 4 where the both end plates 6 serving as the stopper and the vibration damper 4 face each other. In such an arrangement, the magnets 11a and 11b are attached via a non-magnetic plate so that the electromagnetic repulsive force of the magnets 11a and 11b can prevent the vibration damping member 4 from colliding with the end face plate 6 due to excessive shaking.

As the magnets 11a and 11b, so-called permanent magnets or electromagnets are used alone or in plural.

When the structure 1 shakes, the frame 9 is swung together with the structure 1 through the support frame 3. Therefore, the swinging energy of the rail plate 2 of the frame 9 is given to the damping body 4, and the damping body 4 naturally moves to the structure 1.
A single string is vibrated with a natural period tuned to. That is,
The damping body 4 is repeatedly moved along the longitudinal direction of the rail plate 2 via the wheels 5, whereby the vibration of the structure 1 is quickly attenuated.

In the above case, by properly selecting the curvature of the rail plate 2, the damping body 4 is added to the natural period of the structure 1.
The natural periods of can be matched. That is, since the natural period T can be obtained by the equation T = 2π (R / g) ^1/2 , if R (radius of curvature of the rail plate 2) is determined, then T
Can be determined. Therefore, if the natural period of the structure 1 is clear, R can be determined, and the damping body 4 will perform single string vibration at the natural period determined by R, and the structure cycle and the damping body 4 will resonate. Therefore, the damping body 4 can make a large stroke.

Further, in the above, the vibration control body 4 resonates because it is synchronized with the vibration of the structure 1. If the vibration is large, it vibrates too much and collides with the end face plate 6, and the vibration control body 4 is nonlinear. As a result, the vibration damping effect is reduced by the movement that does not match the structure 1. But,
In the present invention, since the collision prevention device including the end plates 6 and the magnets 11a and 11b attached to the opposing surface portions of the vibration damper 4 is provided, the magnets 11a and 11b are repeatedly moved when the vibration damper 4 is repeatedly moved.
It is possible to prevent the vibration-damping body 4 from excessively swinging by giving an optimum anti-collision force by the repulsive force, and thereby to prevent a loss in the vibration-damping effect on the structure 1. In this case, the anti-collision force is adjusted by the magnet 11
This is performed by controlling the magnetic flux of a and 11b. In the method, when the magnets 11a and 11b are permanent magnets, the magnitude of the magnetic flux density is adjusted by increasing or decreasing the number of installed magnets. On the other hand, in the case of an electromagnet, the exciting current is changed. Further, since the magnets 11a and 11b are not mechanical like a hydraulic damping device, mechanical structure deformation does not occur and maintenance is easy.

In the above embodiment, the magnet 11b is attached to the end face of the vibration damping body 4 in the moving direction, but the magnet 11b is not directly attached to the end face, but the end face plate 6 is used.
It may be attached to the upper and lower surfaces or the side surfaces of the vibration damping body 4 depending on the mounting position of the vibration damping body 4.

Next, FIG. 3 shows another embodiment of the present invention. In the same construction as the shake-preventing device shown in FIGS. 1 and 2, a collision preventing device consisting of magnets 11a and 11b is used. The spring type shock absorber 12 is provided on either the inner surface of the end plate 6 as a stopper or both end surfaces of the vibration damper 4 (on the side of the vibration damper 4 in the figure). The shock absorber 1
2 is a cylindrical spring case 14 having an opening 13 at one end
A center rod 15 is fixedly provided in the center of the inside, and a cylindrical plunger 16 is slidably assembled to the center rod 15 so as not to fall off from the center rod 15, and a tip flange of the plunger 16 is attached. Part 17
And / or the inner bottom of the spring case 14 is non-linear (or linear)
The coil spring 18 is arranged so that the plunger 16 is urged outward from the opening 13 of the spring case 14 by the elastic force of the coil spring 18. In addition,
Although 19 is a rubber attached to the front surface of the tip flange portion 17 of the plunger 16, it is not always necessary to attach it.

In the case of the embodiment shown in FIG. 3, the vibration damper 4 collides with the end face plate 6 as a stopper due to excessive shaking, but the shock force at that time is buffered by the buffer device 12. However, no significant loss will occur in the damping effect.

FIG. 4 shows still another embodiment of the present invention. Instead of the spring type shock absorber 12 shown in FIG. 3, a rubber buffer type or gel material type shock absorber 20 is used. is there.

In the case of the embodiment shown in FIG. 4, the same effect as that of the embodiment shown in FIG. 3 can be obtained.

The present invention is not limited to the above embodiment, and the rail plate 2 is not a true arc shape as shown in FIG. 1 as long as the central portion is curved so as to bulge downward. However, for example, it may have a polygonal line shape as shown in FIG. 5A or a V-shaped curved shape as shown in FIG. 5B. Although the application example to the structure 1 has been shown, it is needless to say that it can be applied to any structure as long as the structure causes sway, and that various modifications can be made without departing from the scope of the present invention. is there.

[0022]

As described above, according to the anti-sway device of the present invention, the following excellent effects are exhibited. (i) Install a frame having a rail plate with a required curved shape on the structure, arrange the damping body movably along the rail plate, and give the natural period of the damping body by bending the rail plate. Since no mechanical parts for adjusting the natural period are required, a large stroke can be realized with a simple structure and a large damping effect can be obtained. Since the electromagnetic repulsive force can be applied to prevent the collision of the rail plate that serves as a stopper against the end face plate, it is possible to almost eliminate the loss of the vibration damping effect and to compare it with the mechanical damping device. It is easy to maintain with less deterioration and breakdown. (ii) By adopting a structure in which a shock absorber is provided instead of the magnet, even if the vibration damper collides with the end face plate due to excessive shaking, the shock force at that time can be buffered by the shock absorber. , It is possible to reduce the loss of damping effect.

[Brief description of drawings]

FIG. 1 is a front view showing an outline of an embodiment of an anti-sway device according to the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a partially enlarged view showing the outline of another embodiment of the present invention.

FIG. 4 is a partial enlarged view showing the outline of still another embodiment of the present invention.

FIG. 5 is a schematic view showing an example of the shape of a rail plate, (a) showing a case where the rail plate has a bent line shape, and (b) showing a case where the rail plate has a V shape. .

FIG. 6 is a schematic view showing an example of a conventional shake prevention device.

[Explanation of symbols]

 1 Structure 2 Rail Plate 3 Support Stand 4 Damper 5 Wheel 6 End Face Plate 9 Frame 10 Side Rollers 11a, 11b Magnet 12 Shock Absorber 20 Shock Absorber

Continuation of the front page (72) Inventor Joh Kawase 2-2-1 Otemachi, Chiyoda-ku, Tokyo Ishi Kawashima Harima Heavy Industries Ltd. (72) Inventor Koji Yata 1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Ishikawashima Harima Heavy Industries Co., Ltd. Technical Research Institute (72) Inventor Yoshinobu Hiranishi 3-1-4 Akanehama, Narashino City, Chiba Prefecture Nippon Cable Co., Ltd. Head Office Factory (72) Ichiro Tokumura 3-1-Akanehama, Narashino City, Chiba Prefecture 4 Inside Nippon Cable Co., Ltd. head office factory

Claims (2)

[Claims] 1. A frame, which is formed by mounting end plates on both ends in the longitudinal direction of a rail plate curved so that its central part bulges downward, is fixedly installed on a structure to be shake-prevented, and the rail plate of the frame is fixed. A vibration damper is movably mounted in the longitudinal direction on the top of the frame, and magnets are attached to the inner surfaces of the end plates at both ends of the frame. An anti-sway device having a structure in which a magnet is attached so that 2. The anti-sway device according to claim 1, wherein instead of attaching the magnets to the end plates and both end portions of the vibration damper, a shock absorber is attached to one of the end plate and both end portions of the vibration damper. .