JPH11344073A - Rotational inertia adding mechanism of base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism to give a rotational inertia system to a mechanism in which a link part rotates about the horizontal direction whereby the relative displacement in the event of earthquake is suppressed. SOLUTION: A first supporting part 3 is rotatably installed on a base 2 provided on a floor surface 1 while a third supporting part 9 is rotatably mounted under a base isolation table 12, and a first horizontal arm 5 is installed on the first supporting part 3 while a second horizontal arm 11 is mounted on the third supporting part 9, and further a second supporting part is formed from two portions 6A, etc., wherein the one portion 6A is attached to the tip of the first arm 5 while the other portion is attached to the tip of the second arm 11, and a roller 8 is interposed between the two portions 6A and 6B, and thus a base isolation device is completed, in which a rotary disc 13 is attached to the first supporting part 3, and the side with this part 3 is coupled with the side with the second portion 6B of the second supporting part through a rotation transmitting mechanism consisting of pulleys 14 and 15 and a belt 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In a seismic isolation device, a large displacement occurs between a floor on which the seismic isolation device is installed and a seismic isolation table during an earthquake. This displacement increases the installation space for the seismic isolation device, and causes pressure on the effective area.

[0002] The present invention relates to a means for adding a rotary inertia mechanism for reducing the relative displacement generated during an earthquake.

[0003]

2. Description of the Related Art As a seismic isolation device, the present applicant has already commercialized a device using a ball bearing. However, this device needs to increase the required strength of a member for supporting the ball bearing.

In order to solve this problem, the present applicant filed a patent application for a seismic isolation device using a link and a roller (Japanese Patent Application No. 10-37021).

Further, in the conventional seismic isolation device, an oil damper and a friction damper are generally used as a means for suppressing the relative displacement. However, this also has a disadvantage that the performance of the seismic isolation device is reduced at the same time. have.

In order to solve this problem, the present applicant has filed a patent application for a small-stroke seismic isolator to which a rotary inertia system is added (Japanese Patent Application No. 9-140296).

[0007]

In the above-described small-stroke seismic isolation device, the motion of the seismic isolation table is the addition of a rotary inertia system to the seismic isolation device combining the horizontal movements of the X and Y axes. If a ball screw or the like is used, a relatively simple structure is possible. However, in the seismic isolation device using the link and the roller, it is difficult to apply a rotary inertia system due to its structure. The present invention provides a mechanism for adding a rotary inertia system for suppressing relative displacement during an earthquake to a mechanism in which a link portion rotates in a horizontal direction, such as a seismic isolation device using a link and a roller. What you want to do.

[0008]

According to the present invention, a first support is rotatably provided on a base mounted on a floor, and a third support is rotatably provided under a seismic isolation table. , A first horizontal arm is attached to the first support, a second horizontal arm is attached to the third support, and one end of the first horizontal arm constitutes the second support. And attach
Also, in a seismic isolator in which the other support part constituting the second support part is attached to the tip of the second horizontal arm, and a roller is interposed between the two support parts, a rotating disk is provided on the first support part. Is attached, and the first support portion side and the other support portion side constituting the second support portion are connected to each other by a rotation transmission mechanism including a pulley and a belt to form a rotary inertia adding mechanism in the seismic isolation device.

In addition, instead of the rotation transmission mechanism comprising a pulley and a belt, a rotating disk is attached to the first support,
And the other support portion side of the second support portion may be connected by a rotation transmission mechanism composed of gears.

Further, a third arm is provided on one of the support portions constituting the second support portion, and a rotating disk is attached to the third arm to form the third arm side and the second support portion. May be connected to the other support portion side by a rotation transmission mechanism composed of gears.

When a relative displacement occurs between the seismic isolation table and the floor surface during an earthquake, the third base connected to the seismic isolation table.
And the second arm rotate, and the second support connected thereto rotates.

The first pulley rotates together with the second support, and the second pulley is rotated by moving a belt connecting the second pulley on the first support side.

[0013] The rotating disk rotates together with the second pulley, whereby a rotational inertia can be obtained.

[0014]

1 and 2 show a first embodiment of the present invention, in which a first support portion 3 is rotatably provided on a base 2 installed on a floor 1 by a shaft 4. FIG. . The first support 3 is provided with a first horizontal arm 5, and one end of the first horizontal arm 5 is provided with one support 6A constituting a second support.

A third support 9 is rotatably provided by a shaft 10 below the seismic isolation table 12. Third support 9
Is provided with a second horizontal arm 11,
The other support portion 6B constituting the second support portion is attached to the tip of the horizontal arm 11 of the first embodiment.

The upper surface 6a of one support portion 6A and the lower surface 6b of the other support portion 6B are tapered surfaces of about 1 to 1.5 degrees, and a roller 8 provided on a shaft 7 between both tapered surfaces 6a, 6b. It is interposed.

Although not shown, each of the support portions 3, 6A, 6B, 9 is provided with a radial bearing and a thrust bearing.

The above is a description of a seismic isolation device using a link and a roller previously filed by the present applicant (Japanese Patent Application No. Hei 10-37021).
No particular difference.

A rotary disk 13 constituting a rotary inertia system is mounted on the first support 3. In this embodiment, the first pulley 14 is attached to the other support portion 6B constituting the second support portion, and the second pulley 15 is attached to the first support portion 3. , Both pulleys 1
A belt 16 is stretched between 4 and 15.

In FIG. 1, a seismic isolation table 12
Relative to the floor surface 1, the third support 9 and the second arm 11 connected to the seismic isolation table 12 rotate, and the support 6B connected thereto rotates.

Since the first pulley 14 is fixed to the support portion 6B, the first pulley 14 rotates together with the support portion 6 and a belt 16 connecting the second pulley 15 on the first support portion 3 side. To rotate the second pulley 15.

Since the rotating disk 13 is configured to move integrally with the second pulley 15, the rotating disk 13 rotates together with the second pulley 15. Thereby, rotational inertia can be obtained.

The support portion 6B and the end surfaces 6b, 6a of the support portion 6A
Since the roller 8 is sandwiched between the rollers, a force to return to the original point while rotating the support portion 6B by its own weight is exerted, thereby providing a mechanism that can constantly rotate the rotating disk 13.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, a gear is used as a rotation transmitting mechanism instead of a pulley and a belt. A first gear 17 is attached to the other support portion 6B constituting the second support portion, and a second gear 18 is attached to the first support portion 3.
7, 18 are engaged.

FIG. 4 shows a third embodiment of the present invention. When the relative displacement occurs between the seismic isolation table 12 and the floor surface 1 during the earthquake, the second arm 11 rotates, and the supporting portion 6B connected thereto and the supporting portion 6A sandwiching the roller 8 rotate relatively. Since it may be used, the second
It is also possible to take out an L-shaped arm 19 having the gear 18 and the rotating disk 13 and rotate the arm 19 by the second gear 17 attached to the support 6B.

FIGS. 5 and 6 show the operation of the seismic isolation device. FIG. 5 shows an initial state, and FIG. 6 shows a displacement state.

[0027]

According to the present invention, a rotary inertia system can be suitably added to a seismic isolation device using a link and a roller, which the applicant has previously filed, and a relative displacement generated during an earthquake can be obtained. In this case, the performance of the seismic isolation device is not reduced unlike the case where an oil damper and a friction damper are used.

[Brief description of the drawings]

FIG. 1 is a perspective view of a seismic isolation device according to a first embodiment of the present invention.

FIG. 2 is a front view of the seismic isolation device according to the first embodiment of the present invention.

FIG. 3 is a front view of a seismic isolation device according to a second embodiment of the present invention.

FIG. 4 is a front view of a main part of a seismic isolation device according to a third embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an initial state of the seismic isolation device according to the present invention.

FIG. 6 is an explanatory view showing a displacement state of the seismic isolation device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Floor 2 ... Base 3 ... 1st support part 4 ... Shaft 5 ... 1st arm 6A ... 2nd support part 6B ... 2nd support part 7 ... shaft 8 ... roller 9 ... third support part 10 ... shaft 11 ... second arm 12 ... seismic isolation table 13 ... rotating disk 14 ... 1 pulley 15 ... second pulley 16 ... belt 17 ... first gear 18 ... second gear 19 ... arm

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuta Katamura Kashima Construction Co., Ltd. Technical Research Institute 2-9-1, Tobita-Shi, Chofu-shi, Tokyo

Claims (3)

[Claims] 1. A first support portion is rotatably provided on a base installed on a floor, and a third support portion is rotatably provided below a seismic isolation table, and a first support portion is provided on the first support portion. And a second horizontal arm is mounted on the third support, and one end of the second horizontal support is mounted on a tip of the first horizontal arm. In the seismic isolation device in which the other support part constituting the second support part is attached to the tip of the horizontal arm, and a roller is interposed between the two support parts, a rotating disk is attached to the first support part. Wherein the first support portion and the other support portion constituting the second support portion are connected by a rotation transmission mechanism including a pulley and a belt. Additional mechanism. 2. A first support portion is rotatably provided on a base installed on a floor surface, and a third support portion is rotatably provided below a seismic isolation table, and a first support portion is provided on the first support portion. And a second horizontal arm is mounted on the third support, and one end of the second horizontal support is mounted on a tip of the first horizontal arm. In the seismic isolation device in which the other support part constituting the second support part is attached to the tip of the horizontal arm, and a roller is interposed between the two support parts, a rotating disk is attached to the first support part. A rotation inertia adding mechanism in the seismic isolation device, wherein the first support portion side and the other support portion side forming the second support portion are connected by a rotation transmission mechanism including gears. 3. A first support portion is rotatably provided on a base installed on a floor surface, and a third support portion is rotatably provided under a seismic isolation table, and a first support portion is provided on the first support portion. And a second horizontal arm is mounted on the third support, and one end of the second horizontal support is mounted on a tip of the first horizontal arm. In the seismic isolation device in which the other support part constituting the second support part is attached to the end of the horizontal arm of the above, and a roller is interposed between the two support parts, one of the two parts constituting the second support part is provided. Third on support
And a rotating disk is attached to the third arm, and the third arm side and the other support side constituting the second support section are connected by a rotation transmission mechanism composed of gears. A rotary inertia adding mechanism in a seismic isolation device characterized by the following.