JP2713742B2 - Seismic isolation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a seismic isolation device, and more particularly to a vertical seismic isolation floor having a seismic isolation effect in the vertical direction.

[Conventional technology]

In recent years, seismic isolation floors for protecting important devices such as computers from earthquakes have been developed. Japanese Unexamined Patent Publication (Kokai) No. 61-116142 discloses a method of supporting a semiconductor manufacturing apparatus with laminated rubber in the vertical and horizontal directions. Also, JP-A-59-47
In Japanese Patent Publication No. 543, a floor supported on a horizontal seismic isolation floor via a parallel crank mechanism is provided to enable vertical and horizontal seismic isolation.

[Problems to be solved by the invention]

Although the above-mentioned prior art has achieved the purpose of seismic isolation for the time being for horizontal ground motions, there is a point that it cannot be said that vertical ground motions are sufficient. In other words, when considering vertical seismic isolation, it is necessary to support its own weight in addition to vertical acceleration. However, when the seismic isolation target floor is elastically supported by a spring or the like to exert the specified seismic isolation effect, the rigidity of the spring or the like must be considerably smaller than the rigidity of the seismic isolation target object, etc. It is difficult to achieve both. In addition, vertical seismic isolation floors are usually provided on floors or horizontal seismic isolation floors.In this case, the size of elastic supports such as springs and laminated rubber that satisfy the vertical seismic performance, especially in the height direction The size became quite large, and the height of the vertical seismic isolation floor had to be quite high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and a method of converting a vertical force acting on a vertical seismic isolation floor into a desired direction by a converting means for converting the force into a desired direction, and elastically supporting the force. It is an object of the present invention to solve the above problem.

[Means for solving the problem]

The object is to provide a vertical seismic isolation floor movable in the vertical direction, conversion means for converting a vertical force acting on the vertical seismic isolation floor into a desired directional force, a support floor for supporting the conversion means, And a support device for supporting, via an elastic member, a desired directional force converted by the means.

In addition, the conversion means applies a force acting on a flexible member such as a wire rope or a chain hanging the vertical seismic isolation floor along a circumference of a disk body such as a pulley or a chain wheel in a desired direction. The vertical seismic isolation floor may be connected to the support floor via a parallel crank mechanism that holds the vertical seismic isolation floor horizontally.

Further, the vertical seismic isolation floor and the support floor may be connected via an energy absorbing device, and an energy absorbing device arranged in parallel with the elastic member and operating in phase with the elastic member is provided. You may.

Further, horizontal restraint means may be provided between the vertical seismic isolation floor and the support floor to restrict horizontal movement of the vertical seismic isolation floor and to allow vertical movement freely. A support device for supporting an elastic member may be provided on the support floor, and the elastic member may be any of a spring, a laminated rubber, or a combination thereof. The support floor may be a horizontal seismic isolation floor.

Further, a horizontal seismic isolation floor may be provided on the vertical seismic isolation floor.

(Operation)

The vertical force acting on the vertical seismic isolation floor movable in the vertical direction is converted into a desired directional force by using a converting means provided on the support floor, and the desired force is supported by a support device via an elastic member. Vertical seismic isolation is possible with seismic isolation devices for forces in the direction of.

Using a pulley or chain wheel as the converting means, it is also possible to convert a force acting on a flexible member such as a wire rope or a chain hanging a vertical seismic isolation floor into a force in a desired direction. The vertical seismic isolation floor is connected to the support floor via a parallel crank mechanism, and when the vertical seismic isolation floor moves up and down relative to the support floor, the vertical seismic isolation floor is held parallel to the support floor. Enables vertical movement.

By connecting the vertical seismic isolation floor and the support floor via an energy absorbing device, the relative motion between the vertical seismic isolation floor and the support floor is attenuated.

An energy absorbing device that operates in parallel with and in phase with the elastic member that performs the seismic isolation function by supporting the force in the desired direction converted from the vertical direction is provided to promote the damping action.

The vertical seismic isolation floor is provided with horizontal restraint means between the vertical seismic isolation floor and the supporting floor to restrain the horizontal movement of the vertical seismic isolation floor. It does not adversely affect the seismic isolation function of the member or the damping function of the energy absorbing device.

By attaching the supporting device for supporting the elastic member to the supporting floor, the device can be simplified without reducing the seismic isolation function.

A seismic isolation effect is generated by using a tension spring, a compression spring, a laminated rubber or a combination thereof as an elastic member.

By making the supporting floor a horizontal seismic isolation floor, the vertical
It becomes a horizontal, vertical three-dimensional seismic isolation floor.

In addition, even if a horizontal base-isolated floor is provided on a vertical base-isolated floor, it will be three-dimensional.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a diagram showing the principle of the present invention. Vertical seismic isolation floor 1
Is suspended by a flexible member 3 having low bending rigidity such as a cable or a chain. The cable 3 supporting the vertical seismic isolation floor 1 is horizontally converted by a pulley 2 which is a conversion means attached to the support floor 6 and connected to a spring 4 which is an elastic member. Converts vertical vibration of base-isolated floor into horizontal vibration. In this case, the spring 4 may be connected to the support floor 6. The seismic isolation target 7 may be a computer or the like.

According to this principle, the spring 4 can be freely installed without restrictions on the floor height and the like. The rigidity of the spring 4 can be set to a desired low value without increasing the floor height,
It is possible to realize a seismic isolation device with an extremely long natural cycle as compared with conventional ones.

Furthermore, since the spring 4 and the cable 2 hang the vertical seismic isolation floor 1 and the seismic isolation target 7, a tensile force is always applied unless an acceleration of 1 g works upward, and buckling or the like does not occur. No stability phenomenon occurs.

Next, a first embodiment will be described with reference to FIGS. FIG. 2 is a cross-sectional view of the first embodiment, and FIG. 3 is a plan view of a vertical floor and a supporting floor partially including a panel upper surface of a free access floor.

The vertical seismic isolation floor 1 is suspended at three points by wire ropes 3, and the three wire ropes 3 are connected to the slider 11 via pulleys 2. The slider 11 moves smoothly in the same direction as the wire rope 3 along the guide rail 12, and the three wire ropes 3 move in the same phase to keep the vertical seismic isolation floor 1 horizontal. It is made to vibrate.

The slider 11 is connected to a spring 4, which is connected to a support device 5, which is fixed to a support floor 6.

In addition, the vertical seismic isolation floor 1 has a horizontal restraining means as a horizontal restraint means, which is provided with a driving wheel with a spring which has a low friction so that it resists a shear force which is a horizontal force and is free to move vertically. The restrainers 8 are provided on the four sides to prevent sideways movement.

Further, in addition to the slider 11, a parallel crank 9 is provided between the vertical seismic isolation floor 1 and the supporting floor 6 so that the vertical seismic isolation floor 1 can maintain horizontal and vertically vibrate. By providing the parallel crank 9, the horizontal can be maintained even when the vertical seismic isolation floor is suspended at three or less points. Further, by providing the oil damper 10 in the vertical direction on the vertical seismic isolation floor 1, the vertical seismic isolation is more effectively performed.

Assuming a general computer room, free access floor panels 13 and 14 are respectively provided on the vertical seismic isolation floor 1 and the supporting floor 6 so as to be almost the same height. These panels 13,
14 is supported by pedestal 15 from vertical seismic isolation floor 1 and support floor 6.

According to the first embodiment, the vertical seismic isolation device can be installed at the same height as a normal free access floor. The level difference between the free access floor and the vertical seismic isolation floor 1 can be easily adjusted by changing the length or tension of the spring 4. Next, a second embodiment will be described with reference to FIGS. In the second embodiment, the support floor of the first embodiment is a horizontal seismic isolation floor, and a known horizontal floor may be used. 2 and 3 represent the same contents.

The supporting floor 6 is composed of rigid steel beams, in which the vertical seismic isolation floor 1 is suspended by the wire rope 3 at three points, and
The tension of the wire rope 3 is converted in the horizontal direction by the two pulleys 2 and joined to the slider 11. Slider 11
Moves along a guide rail 12 arranged in the same direction as the wire rope 3 provided between the beams of the support floor 6. The slider 11 is connected via a spring 4 to a supporting device 5 constituted by beams on a supporting floor. The slider 11 has a spring 4
Oy damper 10 is installed in parallel with the above to further enhance the seismic isolation effect.

A horizontal restraint 8 attached to a beam of the support floor 6 acts on the four circumferences of the vertical seismic isolation floor 1 to prevent sideways. A parallel crank 9 is provided between the beam of the support floor 6 provided below the vertical seismic isolation floor 1 and the vertical seismic isolation floor 1, and a slider 11 is provided.
At the same time, the vertical seismic isolation floor 1 is configured to vibrate while maintaining the horizontal level.

The support floor 6 is in contact with a fixed floor 19 via a low-friction support member 16 fixed to the support floor 6, and the low-friction support member 16 is connected to an elastic member 17 for horizontal seismic isolation. Elastic member 17
Is attached to a fixed floor 19 by a fixing device 18.

The supporting floor 6 is connected by rigid steel beams, and moves integrally including the vertical seismic isolation floor 1. Therefore, the seismic isolation target 7 on the vertical seismic isolation floor 1 has been seismically isolated not only vertically but also horizontally, and it is possible to provide a very useful three-dimensional seismic isolation floor.

Further, if the spring 4, the slider 11, and the guide rail are accommodated in the steel beam of the support floor 6 as shown in the second embodiment, the floor height is almost the same as the conventional horizontal seismic isolation floor,
Wiring space can be sufficiently secured.

〔The invention's effect〕

As described above, according to the present invention, a vertical seismic isolation floor is suspended by a wire or the like, and the vertical vibration is converted into a horizontal vibration via a pulley. (2) By installing elastic members for vertical seismic isolation in a desired direction, the length of the natural period can be determined irrespective of the floor height, and within the height of the conventional free access floor. It is possible to provide sufficient three-dimensional seismic isolation devices by allowing sufficient storage space and securing the same wiring space as conventional horizontal seismic isolation floors. .

[Brief description of the drawings]

FIG. 1 is a view showing the principle of the present invention, FIG. 2 is a sectional view of the first embodiment, FIG. 3 is a plan view of the first embodiment, a part of which shows a free access floor top surface, FIG. FIG. 5 is a cross-sectional view of the second embodiment, and FIG. 5 is a plan view of the second embodiment, showing a part of the top surface of the free access floor. DESCRIPTION OF SYMBOLS 1 ... Vertical seismic isolation floor, 2 ... Pulley, 3 ... Wire rope, 4 ... Spring, 5 ... Support device 6 ... Support floor, 7 ... Object to be isolated, 8 ... Horizontal restraint,
9 ... Parallel crank, 10 ... Oil damper, 11 ... Slider, 12 ... Guide rail 13,14 ... Access floor panel, 15 ... Pedestal, 1
6 ... Low friction support material, 17 ... Elastic member for horizontal seismic isolation, 18 ...
... fixing device, 19 ... fixed floor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Omi 1-9-131 Shinonome, Koto-ku, Tokyo Mitsubishi Steel Corporation Tokyo Works (72) Inventor Takashi Fujita 575-28 Nakano Hisagi, Nagareyama City, Chiba Prefecture 56) References JP-A-53-132672 (JP, A)

Claims (10)

(57) [Claims] A vertical seismic isolated floor movable in the vertical direction, a converting means for converting a vertical force acting on the vertical seismic isolated floor into a desired directional force, a support floor for supporting the converting means, A supporting device for supporting, via an elastic member, a desired directional force converted by the converting means. 2. The apparatus according to claim 1, wherein the converting means converts a force acting on the flexible member suspended from the vertical seismic isolation floor to a desired direction by deflecting the force on the circumference of the disk. The seismic isolation device according to claim 1, wherein 3. The seismic isolation device according to claim 1, wherein the vertical seismic isolation floor is connected to the support floor via a parallel crank mechanism that holds the vertical seismic isolation floor horizontally. apparatus. 4. The vertical seismic isolation floor and the supporting floor are connected via an energy absorbing device.
The seismic isolation device according to any one of the three items. 5. The seismic isolation device according to claim 1, further comprising an energy absorbing device disposed in parallel with said elastic member and operating in phase with said elastic member. 6. A horizontal restraint means is provided between the vertical seismic isolation floor and the support floor to restrict horizontal movement of the vertical seismic isolation floor and to allow free vertical movement. The seismic isolation device according to claim 1. 7. The seismic isolation device according to claim 1, wherein a support device for supporting the elastic member is provided on the support floor. 8. The seismic isolation device according to claim 1, wherein said elastic member is any one of a spring, a laminated rubber, and a combination thereof. 9. The seismic isolation device according to claim 1, wherein the support floor is a horizontal seismic isolation floor. 10. The seismic isolation device according to claim 1, wherein a horizontal seismic isolation floor is provided on the vertical seismic isolation floor.