JPH03172642A - Earthquake insulating device - Google Patents

Abstract

PURPOSE:To increase stability of an earthquake insulating device to reduce acceleration of response due to an earthquake by suppressing horizontal relative displacement between an earthquake insulating frame and a partial frame and shearing deformation of upper and lower resilient members by means of a horizontal constraining member. CONSTITUTION:A horizontal member 6 is located between an earthquake insulating frame 5, formed with a horizontal moving member 2-1, e.g. ball bearings, a support bed 3, and a frame 4, and a foundation 1 to suppress horizontal relative displacement. A partial frame 9 is supported on a frame bed 7 fixedly supported to the frame 4 through upper and lower resilient members 8 and a rotation suppressing device 10 to suppress vibration, e.g. rolling. A horizontal constraining member 14 using a steel rod provided at one end or both ends with resilient substances 19, e.g. coil springs, is mounted between the frame 4 and the partial frame 9 so that horizontal relative displacement is suppressed and shearing deformation of the upper and lower resilient members 8 is suppressed. This constitution prevents contact and collision of the frame 4 with the partial frame 9.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seismic isolation device, and particularly to a three-dimensional seismic isolation device in which a horizontal seismic isolation floor is partially provided with a floor that has a vertical seismic isolation effect. This invention relates to a seismic isolation device suitable for earthquake beds.

[Prior art] Regarding conventional seismic isolation devices, please refer to Nikkan Kogyo Shimbun's "Atomic Crab Industry" Vol. 34, No. 12 reprint, published in December 1988 [
“Seismic Isolation Structures in Nuclear Facilities”.

Discussed in the article written by Takashi Fujita of the Institute of Industrial Science, the University of Tokyo.

In addition, techniques described in Japanese Patent Application Laid-open Nos. 59-47543 and 62-27835 are also known.

For example, seismic isolation objects such as nuclear facilities, computer equipment, electrical instrumentation equipment, and semiconductor manufacturing equipment require vertical seismic isolation in addition to horizontal seismic isolation. Therefore, when configuring a three-dimensional seismic isolation floor, an elastic member for vertical seismic isolation is provided on a first support pedestal that is horizontally two-dimensionally seismically isolated on the foundation, and a second support for the upper and lower A pedestal is provided and the seismically isolated body on the second support pedestal is caused by an overturning moment during a horizontal earthquake.
A linkage mechanism is provided between the first and second support cradle to prevent pitching and rolling vibration of the second support cradle.

In such a conventional structure, in order to suppress relative displacement in the horizontal direction between the first support frame and the second support frame, the structure described in JP-A-59-47543 uses double parallel links. Adopts a pantograph mechanism used for reverse double series,
In the device described in JP-A No. 62-278335, a cross link mechanism in which one end slides or a first and second
A guide mechanism such as a slider or ball bearing is provided between the supporting frames.

FIG. 6 is a side view showing an example of a conventional partial three-dimensional seismic isolation floor.

In Fig. 6, IA is the foundation, 2A is a horizontally movable member that can move in a horizontal plane on the foundation IA, 4A is a first support frame that is horizontally two-dimensionally isolated, and 9A is vertically seismically isolated. 12 is a column, and 13 is a floor plate. 6
A is a horizontal elastic member provided between the foundation IA and the first support pedestal 4A, 8 is a vertical elastic member provided between the first support pedestal 4A and the second support pedestal 9A, and 10 is a horizontal elastic member provided between the first support pedestal 4A and the second support pedestal 9A. The rotation suppressor 20 is a friction pad.

[Problems to be Solved by the Invention] In the above-mentioned prior art, since the entire weight of the second support frame is supported by the first support frame, the rigidity of the first support frame is increased. As a result, no consideration was given to the increase in the height from the top surface of the foundation to the top surface of the second support pedestal. In addition, sliders, rollers, etc. are provided to suppress horizontal relative displacement between the first and second support frames.
There was a risk that the performance of vertical seismic isolation would be impaired due to the frictional forces on these mechanisms.

The present invention was made in order to solve the above-mentioned problems of the prior art, and it lowers the height of the device and connects the base isolation pedestal (first support pedestal) and partial pedestal (second support pedestal). By suppressing horizontal relative deformation and reducing shear deformation of the upper and lower elastic members,
The purpose is to prevent contact and collision between the seismic isolation pedestal and the partial pedestal, and to provide a stable three-dimensional seismic isolation device.

[Means for Solving the Problem] In order to achieve the above object, the configuration of the first invention related to the seismic isolation device of the present invention includes a plurality of horizontally movable members that can move within a horizontal plane on the foundation. In a seismic isolation device comprising a base isolation pedestal consisting of a support base and a pedestal supported by the support base, and a horizontal elastic member provided between the base isolation pedestal and a foundation, the base isolation pedestal is connected to the base isolation pedestal. A partial seismic isolation floor consisting of a frame with a fixed structure, a second horizontally moving member provided between the frame and the foundation, and a partial pedestal supported on the frame via vertical elastic members. It has been established.

In addition, in order to achieve the above object, the structure of the second invention related to the seismic isolation device of the present invention includes a support base equipped with a plurality of horizontally movable members that can move in a horizontal plane on a foundation, A seismic isolation system is equipped with a seismic isolation pedestal consisting of a pedestal supported by a base, and a horizontal elastic member is provided between the seismic isolation pedestal and the foundation. A partial seismic isolation floor consisting of a horizontal base, a second horizontally moving member provided between the horizontal base and the foundation, and a partial pedestal supported on the horizontal base via vertical elastic members. The support base of the seismic isolation frame and the horizontal base are connected by a connecting member.

Furthermore, in order to achieve the above object, the configuration of the third invention related to the seismic isolation device of the present invention is such that, in addition to the configurations of the first and second inventions, A plurality of horizontal deformation restraining members are provided to suppress relative horizontal displacement between the two.

More specifically, a floor plate is provided independently via a support on each of the base and partial base of the seismic isolation frame, and a plurality of horizontal deformation restraining members are provided in the space between each of these bases and the floor plate. It is something that

Further, the horizontal restraint member has an elastic body interposed at at least one end thereof to apply tension.

Additionally, in order to suppress the horizontal relative displacement between the horizontal two-dimensional seismic isolation floor pedestal, which is the first support pedestal, and the partial seismic isolation floor, which is the second support pedestal, A mover, rollers, etc. may be provided.

If the frictional force caused by these becomes a problem, it is better to provide the horizontal deformation restraining member in the form of a strand or string such as a steel rod, wire, or chain.

[Action Co. The function of the above technical means is as follows.

By interposing a horizontally movable member between the frame or horizontal base that supports the partial frame and the foundation, the load received by the frame or horizontal base can be directly supported by the foundation, so that the frame, frame, or water There is no need to consider the rigidity of the flat platform, and the height of the partial platform can be reduced.

Further, as a horizontal deformation restraining member, for example, a steel bar is used.

Parallelism and perpendicularity can be adjusted accurately by using a wire, chain, etc., interposing an elastic body between one or both ends of the wire and the mounting member, and applying a tension load to the horizontal deformation restraining member. Even if the horizontal two-dimensional seismic isolation floor on the side of the first support pedestal and the partial three-dimensional seismic isolation floor on the side of the second support pedestal are not used, it is possible to suppress relative horizontal displacement between the horizontal two-dimensional seismic isolation floor on the side of the first support pedestal and the partial three-dimensional seismic isolation floor on the side of the second support pedestal, thereby preventing contact and collision between the two. can be prevented. In addition, by interposing the above-mentioned elastic body, the force applied to the horizontal deformation restraining member due to the vertical relative displacement between the base isolation floor and the partial three-dimensional base isolation floor due to the expansion and contraction of the upper and lower elastic bodies of the partial three-dimensional base isolation floor. It is possible to reduce the

[Embodiments] Hereinafter, each embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a side view of a seismic isolation device including a partial three-dimensional seismic isolation floor according to an embodiment of the present invention.

In Fig. 1, 1 is a foundation, 2 (general term for 2-1 and 2-2) is a plurality of horizontally movable members such as ball bearings and sliders that can move in a horizontal plane on the foundation 1; -1 is
The horizontally moving member 2-2 provided on the support stand 3 side is a second horizontally moving member provided on the frame 7 side, which will be described later.

3 is a support base, 4 is a pedestal supported by the support base '3, and 5 is a horizontally moving member 2-1. Support stand 3. This seismic isolation pedestal is composed of a pedestal 4, and the seismic isolation pedestal 5 corresponds to a first support pedestal that is seismically isolated in two horizontal dimensions. 6 is a horizontal elastic member provided between the seismic isolation frame 5 and the foundation 1; 7 is a frame fixedly connected to the pedestal 4; 8 is a vertical elastic member; 9 is the vertical elastic member. The partial pedestal 8 is supported above the frame 7, 10 is a rotation suppressing device for suppressing rolling and pitching vibrations of the partial pedestal 9, and 11 is a link member thereof. These second horizontally moving members 2-2° frame 7. A partial three-dimensional seismic isolation floor corresponding to the second support pedestal is configured by the vertical elastic member 82 and partial pedestal 92 rotation suppressing device.

12-1 is a column of the pedestal 4, 13-1 is a floor plate on the pedestal 4, 12-2 is a column of the partial pedestal 9, and 13-2 is a floor plate on the partial pedestal 9.

To summarize the above, a plurality of support stands 3 formed via a plurality of horizontally moving members 2-1 that can move in a horizontal plane on the foundation 1, a pedestal 4 supported by the support stands 3, A seismic isolation pedestal 5 is provided, and a horizontal elastic member 6 is provided between the seismic isolation pedestal 5 and the foundation 1 to form a horizontal two-dimensional seismic isolation floor.

A partial pedestal 9 is supported on a frame 7 that is fixedly supported from the pedestal 4 via vertical elastic members 8, thereby forming a partial three-dimensional seismic isolation floor. and.

A rotation suppressing device 10 is provided between the partial pedestal 9 and the frame 7 to suppress rolling and pitching vibrations of the partial pedestal 9.

The configuration of the rotation suppressing device 10 includes a partial mount 9, a frame 7, and five link members 11, the ends of each link member 11 are connected with a pin, and two sets of parallelograms sharing a side are formed. They are formed in the same plane, and the mechanism is such that the frame 7 and the partial pedestal 9 are kept parallel by the action of the parallel link.

In addition, in this embodiment, the floor plate 1 is placed on the pedestal 4 and the partial pedestal 9 via the pillars 12 (collectively referred to as 12-1 and 12-2).
3 (general term for 13-1 and 13-2), it has a so-called free access floor structure with a double floor configuration.

Furthermore, a horizontal restraint member 14 is attached between the mount 4 and the partial mount 9 by a mounting member 15 for suppressing the relative displacement of both in the horizontal direction during an earthquake, the details of which will be described later with reference to FIG.

Next, the operation of the seismic isolation device shown in FIG. 1 will be explained.

Regarding horizontal seismic isolation, since the seismic isolation pedestal 5 is supported by the horizontally moving member 2-1, it can freely move on the foundation 1 within a horizontal plane. In addition, a restoring force is applied to the seismic isolation frame 5 by a plurality of horizontal elastic members 6, so that the entire structure vibrates at a low frequency to reduce response acceleration due to an earthquake.

Regarding seismic isolation in the vertical direction, the seismic isolation pedestal 5 is not effective, but the partial pedestal 9 is supported by the vertical elastic members 8 on the frame 7, so it vibrates at a low frequency in the vertical direction. Furthermore, a rotation suppressing device 10 that maintains parallelism between the frame 7 and the partial frame 9 reduces the response acceleration in the vertical direction due to an earthquake without generating rocking vibrations.

A horizontal deformation restraining member 14 connecting the frame 4 and the partial pedestal 9 restrains horizontal relative displacement between the two, suppresses shear deformation of the vertical elastic member 8, and prevents contact between the pedestal 4 and the partial pedestal 9. , collisions can be prevented.

According to this embodiment, by interposing the horizontally moving member 2 between the frame 7 that supports the partial pedestal 9 and the foundation 1, the partial pedestal 9 can be loaded without increasing the support strength of the frame 7. You can increase the amount.

Furthermore, the floor area above the partial pedestal 9 can be increased.

Next, FIG. 2 is a side view of a seismic isolation device including a partial three-dimensional seismic isolation floor according to another embodiment of the present invention.

In the figure, parts with the same symbols as in Figure 1 are equivalent parts, so
The explanation will be omitted.

The embodiment shown in FIG. 2 has a structure in which a partial pedestal 9 is supported by a horizontal movable table 16, which is a horizontal table provided independently of the base isolation pedestal 5, to reduce the weight of the frame 7.

A plurality of horizontally movable members 2-2 are provided between the horizontally movable table 16 and the foundation 1, so that the horizontally movable table 16 can move on the horizontal plane of the foundation 1, and the 9-part pedestal 9 and its load can be moved. Its own weight is not supported by the frame 4.

It has a structure in which it is supported by a horizontal moving table 16. Note that in order to prevent contact and collision between the pedestal 4 and the horizontal moving table 16, a connecting member 17 is used to connect the two.

According to the embodiment shown in FIG. 2, the same effects as those of the previous embodiment shown in FIG. 1 can be expected, and there is also an effect unique to this embodiment in that the weight of the seismic isolation frame can be reduced.

Next, FIG. 3 is a top view of a seismic isolation device in which the partial seismic isolation structure of the present invention is applied to a large horizontal two-dimensional seismic isolation floor, and FIG.
In Figure 1, which is a side view of the same, the parts with the same reference numerals as in Figures 1 and 2 are the same parts as those in the previous embodiments, so their explanation will be omitted. Note that the rotation suppressing device 10 is not shown in FIG. 4.

In the apparatus shown in FIGS. 3 and 4, a notch 21 is provided in a part of the base isolation pedestal 5, and a partial pedestal 9 is provided in this notch 21.
A partial three-dimensional seismic isolation floor was constructed by deploying

Next, FIG. 5 is a partially enlarged view showing an example of how the horizontal deformation restraint member is attached. In FIG. 0, parts with the same reference numerals as those in FIG.

As shown in FIG. 5, the base 4 and partial base 9 of the base isolation base 5
On each frame with 12-1, 12-
Floor plates 13-1 and 13-2 are provided through the base isolation frame 5 and 9 parts, and both of the base isolation frame 5 side and the 9 part frame 9 side are free access.
It has a floor structure. A plurality of horizontal deformation restraining members 14 are attached by attachment members 15 to the space formed by each of these frames and the floor plate.

The horizontal deformation restraining member 14 is attached so as to suppress relative displacement in the horizontal direction between the base isolation pedestal 5 and the partial pedestal 9, and is made of, for example, a steel rod, wire, chain, or the like. Further, a hook member 18 and an elastic body 19 such as a coil spring are provided between one end or both ends of the horizontal deformation restraining member 14 (one end on the seismic isolation frame side in FIG. 5) and the mounting member 15. .

That is, the elastic body 19 can reduce the force applied to the horizontal deformation restraining member 14 due to relative displacement in the vertical direction.

According to this method of attaching the horizontal deformation restraining member 14,
Since there is no sliding part compared to the friction pad 20 in the conventional device shown in FIG. 6, this embodiment has an advantage that the performance of vertical seismic isolation is stabilized, which is unique to this embodiment.

[Effects of the Invention] As explained in detail above, according to the present invention, the horizontal relative displacement between the base isolation pedestal and the partial pedestal is suppressed, the shear deformation of the upper and lower elastic members is reduced, and the base isolation pedestal and the partial pedestal are It is possible to provide a stable three-dimensional seismic isolation device that prevents contact and collision with the pedestal.

[Brief explanation of the drawing]

Fig. 1 is a side view of a seismic isolation device equipped with a partial three-dimensional seismic isolation floor according to one embodiment of the present invention, and Fig. 2 is a side view of a seismic isolation device equipped with a partial three-dimensional seismic isolation floor according to another embodiment of the present invention. A side view of the seismic isolation device equipped with
Fig. 3 is a top view of a seismic isolation device in which the partial seismic isolation structure of the present invention is applied to a large horizontal two-dimensional seismic isolation floor, Fig. 4 is a side view thereof, and Fig. 5 is horizontal deformation restraint. FIG. 6, a partially enlarged view showing an example of how members are attached, is a side view showing an example of a conventional partial three-dimensional seismic isolation floor. 1...Foundation, 2-1.2-2...Horizontal moving member, 3
... Support stand, 4... Frame, 5... Seismic isolation frame, 6.
...Horizontal elastic member, 7... Frame base, 8... Vertical elastic member, 9... Partial frame 510... Rotation suppressing device, 12
-1.12-2... Support column, 13-1.13-2... Floor plate, 14... Horizontal restraint member, 15... Mounting member, 1
6... Horizontal moving table, 17... Connecting member, 18...
Hook member, 19...elastic body.

Claims (1)

[Claims] 1. A seismic isolation pedestal comprising a support pedestal equipped with a plurality of horizontally movable members movable in a horizontal plane on a foundation, and a pedestal supported by the support pedestal; A seismic isolation device including a horizontal elastic member provided between a pedestal and a foundation, comprising: a pedestal connected to the seismic isolation pedestal; a second horizontally movable member provided between the pedestal and the foundation; A seismic isolation device characterized in that a partial seismic isolation floor consisting of a partial pedestal supported via upper and lower elastic members is provided on the frame. 2. A seismic isolation pedestal consisting of a support pedestal equipped with a plurality of horizontally movable members movable in a horizontal plane above the foundation, and a pedestal supported by the support pedestal, and between the seismic isolation pedestal and the foundation. A seismic isolation device including a horizontal elastic member provided on the seismic isolation pedestal, comprising: a horizontal base provided independently of the base isolation pedestal; a second horizontally movable member provided between the horizontal base and the foundation; and the horizontal base. A partial seismic isolation floor consisting of a partial pedestal supported via upper and lower elastic members is provided on top of the seismic isolation pedestal, and the supporting base of the seismic isolation pedestal and the horizontal pedestal are connected by a connecting member. Seismic isolation device. 3. The seismic isolation device according to claim 1 or 2, characterized in that a plurality of horizontal deformation restraining members are provided between the seismic isolation pedestal and the partial pedestal to suppress horizontal relative displacement between the two. 4. A floor plate is provided independently via a support on each of the base and partial base of the seismic isolation frame, and a plurality of horizontal deformation restraining members are provided in the space between each of these frames and the floor plate. The seismic isolation device according to claim 3, characterized in that: 5. Claim 3 or 4, characterized in that an elastic body is interposed at at least one end of the horizontal deformation restraining member to apply tension.
Any of the seismic isolation devices listed.