JPH07119795A - Earthquake damping device - Google Patents

Abstract

PURPOSE:To regulate the intrinsic cycle of a weight easily. CONSTITUTION:Support rollers 3 are provided to the left side and the right side on a base frame 2. On the left side and the right side support rollers 3, a V-shaped rail 4 composed by connecting the left side and the right side rail bodies 4a through a hinge 5 is loaded allowable to fluctuate freely. A weight 6 long in the lateral direction is loaded on the V-shaped rail 4, and its central part is connected to the hinge 5. Between the both ends of the weight 6 and the both ends of the V-shaped rails 4, operation devices to regulate the intrincsic cycle of the weight 6 by converting the V-shaped angle of the V-shaped rail 4 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is installed on top of structures such as suspension bridge towers, super high-rise buildings, towers, and steel towers to prevent wind load (aerodynamic force) vibrations of these structures and vibration amplitudes due to earthquakes. The present invention relates to a vibration control device that is used to suppress and quickly damp vibrations.

[0002]

2. Description of the Related Art As a vibration control device of this kind, it is possible to reduce the sway of a structure by converting the sway energy given to the structure into a kinetic energy of a weight and efficiently damping it. Those are already known (Japanese Patent Laid-Open No. 3-163238). This is a developed version of a simple pendulum. As shown in the outline of an example in FIG. 3, a base frame b is installed on the top of a structure a, and the base frame b is provided on the left and right sides at a required interval. 2 supporting rollers c are installed at a total of 2 places, and a weight d as a damping mass having a V-shaped bottom is oscillated on the left and right supporting rollers c on each of the left and right supporting strings. It is swingably installed to form a spring system by a restoring force using gravity, and left and right protrusions e are provided on both front and rear side surfaces of the weight d, and the weight d is installed at a position sandwiching the weight d in the front and rear. The left and right buffers g corresponding to the protrusions e are attached to the pedestal f so that the swing region of the weight d is restricted within the range in which the protrusion e contacts the buffer g. , Swinging the building with a phase that is 90 degrees behind the shaking of the building Les are as be reduced to or fast.

[0003]

However, in the case of the vibration control device using the weight d having the V-shaped bottom surface, the weight d
Since the vibration cycle is determined by the radius from the swing center when swinging like a pendulum, there is a problem that once the cycle is set, it becomes difficult to adjust the natural cycle.

[0004] Therefore, recently, a device capable of adjusting the natural period of the weight has been proposed and has already been filed by the present applicant (Japanese Patent Application No. 5-219223).
issue). This is to mount a weight on the left and right support rollers via a V-shaped bendable rail so that the weight can swing, and between the both ends of the weight and the V-shaped rail. The liner for adjusting the natural period is interposed so that the V-shaped angle of the V-shaped rail can be changed by the thickness of the liner.

In the case of the method recently applied, the V-shaped angle of the V-shaped rail can be changed, so that the natural period can be easily adjusted.

The present invention aims to take the above-mentioned recently applied system one step further so that the natural period can be easily adjusted even while the apparatus is in operation.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a V-shaped rail in which left and right rail bodies are hinge-joined in a V-shape on a support roller which is spaced from each other. On the V-shaped rail, a weight elongated in the lateral direction is placed parallel to the longitudinal direction of the V-shaped rail, and the central portion of the weight is mounted on the V-shaped rail. An actuator for connecting to the hinge of the V-shaped rail and for adjusting the natural period by changing the V-shaped angle of the V-shaped rail is interposed between both ends of the weight and the V-shaped rail. Let it be the configuration.

[0008]

When the weight is placed on the V-shaped rail and is swung on the support roller, a damping mass equivalent to that of a simple pendulum can be obtained. Further, the V-shaped angle of the V-shaped rail can be arbitrarily changed by changing the expansion / contraction amount of the actuating device such as a jack interposed between both ends of the rail in the left-right direction and both ends of the weight. , The natural period can be changed even during operation.

[0009]

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

FIG. 1 shows an embodiment of the present invention, in which a base frame 2 is provided on the top of a structure 1 which swings by receiving an external force.
Are installed, and two support rollers 3 are installed on the base frame 2 with a required space left and right at a total of four places. On the left and right support rollers 3, one ends of the left and right rail bodies 4a are V-shaped. A V-shaped rail 4 formed by butting together a hinge 5 so that the V-shaped angle can be adjusted so as to form a mold is placed so as to be swingable in the left-right direction, and on the V-shaped rail 4. The weight 6 serving as a seismic control mass is lengthened in the lateral direction and placed so as to be parallel to the longitudinal direction of the V-shaped rail 4, and the central portion of the weight 6 is placed between the rail bodies 4a. It is connected to the joined hinge 5 via a bracket 7, and both ends of the weight 6 are connected to each other.
An electric jack 9 adapted to be expanded and contracted by a drive of a motor 8 is vertically interposed between the both ends of the V-shaped rail 4, and the jack 9 is attached to the V-shaped rail 4 by a pin 11. Installed on the frame 10 attached at
Is oscillated integrally with the V-shaped rail 4 on the support roller 3 in the left-right direction so as to perform a single-string vibration, thereby forming a spring system by a restoring force utilizing gravity, and further on the structure 1. A shake sensor 12 is attached, and a controller 13 that calculates a signal detected by the shake sensor 12 and sends a drive command to the motor 8 of the jack 9 is provided, and the controller 13 responds to a change in the vibration characteristic of the structure 1. By sending the driving command to the motor 8 to adjust the extension and contraction of the jack 9, the natural period of the weight 6 can be adjusted.

Further, protrusions 14 are provided at left and right positions on both front and rear side surfaces of the weight 6, and a pedestal 15 installed at a position sandwiching the weight 6 in the front and back is provided with left and right buffers 16 corresponding to the protrusions 14. And attach the projection 14 to the buffer 1
The swinging area of the weight 6 is restricted within the range of contacting the weight 6, and the weight 6 swings in a phase delayed by 90 degrees with respect to the swing of the structure 1 to swing the structure 1. Can be reduced quickly.

When the structure 1 shakes due to an earthquake or the like, the weight 6 swings left and right together with the V-shaped rail 4 on the left and right support rollers 3 so as to perform a single-string vibration. Operates as a letter-shaped seismic control mass. That is, when the present apparatus is configured as a hybrid type, for example, a weight driving motor mounted coaxially with the support roller 3 drives the weight 6 with a 90 ° phase shift with respect to the swing of the structure 1. Thus, the sway of the structure 1 can be attenuated. On the other hand, in the case of the passive type, the sway energy given to the weight 6 with a delay of 90 degrees due to the sway of the structure 1 can be attenuated by a damper or the like. Thus, the swing of the structure 1 can be attenuated.

In the above, in order to optimally apply the damping force to the structure 1, it is necessary to match the natural period of the weight 6 with the natural period of the structure 1. However, in the present invention, The natural period 6 can be easily adjusted even during operation. That is, the natural period of the device itself is determined by the V-shaped angle of the V-shaped rail 4, but the left and right jacks 9 interposed between the both ends of the weight 6 and the V-shaped rail 4. When the amount of expansion and contraction is changed by driving the motor 8, the angle of the V-shape centering on the hinge 5 of the V-shaped rail 4 changes, and the swing locus of the weight 6 can be changed. The natural period of the device itself can be adjusted.

Now, the adjustment of the natural period will be described in comparison with the apparatus of FIG. 2 without the jack 9. Now, in the device shown in FIG. 2 without the jack 9, if the weight 6 is considered as a pendulum, the radius which is the distance from the pendulum center O to the center of gravity G of the weight 6 is r ′. On the other hand, as in the device of the present invention shown in FIG. 1, the jack 9 interposed between the left and right ends of the weight 6 and the left and right ends of the V-shaped rail 4 is extended to extend the V-shaped rail 4. When the V-shaped angle is opened, the radius from the center O of the pendulum to the center of gravity G of the weight 6 becomes r longer than r '. That is, in the case of the apparatus shown in FIG. 2, the pendulum length is short, so that the cycle becomes short, and in the apparatus shown in FIG. 1, the pendulum length becomes long, so that the cycle becomes long. Therefore, the shake of the structure 1 due to the disturbance is detected by the shake sensor 12, and the controller 13 calculates and analyzes it momentarily to obtain the shake cycle, and the motor 8 is driven by the drive command according to the vibration characteristic of the structure 1. By driving and adjusting the expansion / contraction amount of the jack 9, the cycle of the weight 6 can be perfectly synchronized with the cycle of the structure 1. Further, the weight 6 does not need to be formed in an arc shape and can be formed in any shape, which is advantageous in terms of processing.

Although the present invention shows the case where the V-shaped angle of the V-shaped rail 4 is changed by the jack 9 in the above embodiment, other operating devices such as a pantograph device and a cylinder device are shown. However, it goes without saying that various changes can be made without departing from the scope of the present invention.

[0016]

As described above, according to the vibration control device of the present invention, the weight can be oscillated so as to perform the single string vibration on the support roller via the V-shaped rail. Since the damping effect can be obtained by the kinetic energy that causes the string vibration, and the V-shaped angle of the V-shaped rail can be adjusted by the actuating device interposed between the V-shaped rail and the weight,
It is easy to adjust the natural period of the weight even during operation, and it can be perfectly matched to the structure, so that it is possible to cope with the period deviation due to aging of the structure on site, especially the hybrid type. In the case of the above configuration, the motor power for driving the weight can be small, heat, vibration, and noise generated from the motor can be reduced, and deterioration of the environmental influence on the surroundings of the structure can be suppressed as much as possible. At the same time, energy saving and compactness can be achieved, and since the motor power can be reduced, the weight can be greatly shaken during disturbance compared to the same level of motor driving force, and a high damping effect can be obtained. It exhibits excellent effects such as being able to.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a vibration control device of the present invention.

FIG. 2 is a view showing a vibration control device without a jack, and is a diagram comparing the length of the pendulum radius with the vibration control device shown in FIG.

FIG. 3 is a schematic diagram showing an example of a single-string vibration type vibration damping device using arcuate weights.

[Explanation of symbols]

 3 Support roller 4 V-shaped rail 4a Rail body 5 Hinge 6 Weight 9 Jack (actuator)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Nakamura Inventor Kenji Nakamura 1-19-10 Mori, Koto-ku, Tokyo Ema Tadashi Building Ishikawashima Harima Heavy Industries, Ltd. Koto office (72) Inventor Masanori Maruoka 1-chome Mori, Koto-ku, Tokyo 19-10 No. Ema Tadashi Building Ishikawajima-Harima Heavy Industries Co., Ltd. Koto office (72) Inventor Yasushi Murata 1-19-10 Mohri Koto-ku Tokyo Metropolitan Kota-ku Ishikawajima Harima Heavy Industries Co., Ltd. Koto Office (72) Inventor Yata Koji, Ishikawajima-Harima Heavy Industry Co., Ltd., Technical Research Laboratory, 1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Prefecture (72) Inventor Yuji Koike, Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Prefecture 72) Inventor Shunichi Yamada 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. ( 72) Inventor Tomohiko Arita 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Taiji Kurokawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. 72) Inventor Koji Ishii, 19-1 Tobita, 2-1-1, Chofu-shi, Tokyo Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A V-shaped rail having left and right rail bodies hinged to each other in a V-shape is oscillatably mounted on a support roller arranged apart from each other, and on the V-shaped rail. In addition, a weight elongated in the lateral direction is placed parallel to the longitudinal direction of the V-shaped rail, the central portion of the weight is connected to the hinge of the V-shaped rail, and both ends of the weight are connected. A vibration damping device having a structure in which an actuating device for adjusting the natural period by changing the V-shaped angle of the V-shaped rail is interposed between the section and the V-shaped rail.