JPH1182617A - Seismic isolation device - Google Patents

Abstract

(57) [Summary] The object of the present invention is to provide a compact seismic isolation device that can be placed under an electronic device and has not only a seismic isolation effect that ensures the function of the electronic device in the event of an earthquake, but also significant displacement suppression performance. This is a seismic device that prevents the electronic device from moving excessively even during a large earthquake. The present invention provides a compact seismic isolation device in which a rolling member and a damping member using a high-viscosity fluid for preventing a large movement of an electronic device are independently disposed so as to exhibit a seismic isolation effect. It is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic countermeasure for an electronic device, and more particularly to a seismic isolation device that supports a leg of the electronic device or a mount on which the electronic device is mounted.

[0002]

2. Description of the Related Art Seismic measures for electronic devices are roughly classified into a fixed method, a non-fixed method, and a method using a base-isolated floor. The electronics are typically mounted on a free access floor supported by a number of pedestal members located on the floor of the building. Is a method of fixing the electronic device with a support device provided on the floor of the building.The electronic device does not move or fall, but the response acceleration of the electronic device during an earthquake increases. In addition, it is difficult to maintain the functions of electronic devices during an earthquake. Since the non-fixing method has a relatively short construction period and does not fix the electronic device, the electronic device can be moved during an earthquake, and the acceleration of the electronic device is reduced as compared with the fixing method.

[0003] Therefore, it is possible to maintain the function of the electronic device during a small-scale earthquake, but there is a high possibility that the electronic device will fall over and be damaged during a large-scale earthquake, and a secondary disaster such as a personal injury may occur. There is.

In the method using a seismic isolation floor, a free access floor on which an electronic device is mounted, a supporting device that supports the electronic device and can be moved in a horizontal direction, a spring device that gives a restoring force to the free access floor, and a movement amount are suppressed. Although it is composed of a seismic isolation device consisting of a damping device, it is possible to maintain the function of the electronic device even during a large earthquake, but this method requires the most cost and construction time among the three methods.

A seismic isolation device belonging to the non-fixed method has basically the same configuration as a seismic isolation device used for a seismic isolation floor, and provides a support device that enables horizontal movement of an electronic device and a restoring force. Consists of a spring device and a damping device. In particular, the prior art seismic isolation device is provided to support the lower part of the housing of the electronic device, as described in, for example, Japanese Patent Application Laid-Open No. 64-43643. The sliding member that enables horizontal movement of the seismic isolation device itself and the rolling member that enables the movement of the seismic isolation device itself allows the rolling member to move within the mounting member and reduce the acceleration of the electronic device main body in the event of a small earthquake. Also,
In the case of a large earthquake, when the strut collides with the wall of the mounting member, the entire mounting member slides on the free access floor by the sliding member, and the response acceleration of the electronic device is suppressed to a relatively small value.

[0006]

However, the above prior art has the following problems. During large earthquakes or earthquakes with many low-frequency components, when the building is installed in a tall building with a low natural frequency, the amount of movement increases, and the struts collide with the mounting member wall at a high speed. Will do. Also, earthquakes that contain many high-frequency components,
When the building is installed in a short building with a high natural frequency, the sliding movement causes a large frictional force, causing rocking vibration that deforms the part supporting the electronic device body with the seismic isolation device, resulting in smooth movement. The seismic isolation effect of moving is impaired because it becomes difficult.

[0007] In the case of a large earthquake, when the sliding member slides on the free access floor, a large slip may occur, which may cause a nearby person to hit. In addition, cable holes are provided on the raised floor for wiring of electronic devices, but the seismic isolation device may fall into the cable holes or be caught in the wiring, causing the electronic device to fall or be damaged. is there.

An object of the present invention is to provide a compact seismic isolation device which can be arranged below an electronic device and has not only a seismic isolation effect capable of ensuring the function of the electronic device in the event of an earthquake, but also a significant displacement suppression performance. Even when an earthquake occurs, it is possible to prevent the electronic device from excessively moving, prevent the electronic device from being damaged due to a fall, and prevent a secondary disaster such as a personal injury.

[0009]

In order to achieve the above object, the present invention provides a rolling member and a damping member using a high-viscosity fluid for suppressing a large amount of movement so that a seismic isolation effect can be achieved. And compactly configured.

The present seismic isolation device has a structure in which a rolling member for supporting and moving the electronic device and a damping member made of a highly viscous fluid are provided in a cylindrical member. If a rolling member is placed in a highly viscous high-viscosity fluid, not only will the rolling member fail to function, but also the rolling member will hinder the action of the high-viscosity fluid. And a high-viscosity fluid and a rolling member are provided independently by utilizing the upper and lower portions.

Next, the operation of the above structure will be described. In the present invention, when a horizontal seismic force is applied to the electronic device, the moving plate supported by the rolling member moves together with the electronic device. Thereby, a seismic isolation effect can be obtained. In addition, the moving plate integrated with the supporting bolt supported by the electronic device moves in the high-viscosity fluid, and receives a shear viscous resistance force to suppress the moving amount. When a damping member using a high-viscosity fluid is used in combination, the seismic isolation effect is slightly reduced because the damping effect is large, but there is a great displacement suppression effect particularly in a large earthquake.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 2 is an elevation view in which the seismic isolation device of the present invention is applied to an electronic device. In this embodiment, the seismic isolation device 14 of the present invention is arranged such that a pedestal member 16 is disposed on a floor 15 of a building, a free access floor 17 is provided thereon, and a leg of an electronic device 18 is supported thereon. It is provided.

FIG. 1A is a plan view of one embodiment of the present invention, and FIG. 1B is a cross-sectional view along the line AA 'in FIG. 1A. However, FIG. 1A shows the first moving plate 3 in FIG.
FIG.

In FIG. 1, first and second movable plates are attached to support bolts 5 for supporting an electronic device, and the first movable plate 3 is attached to a wall of a cylindrical member 1 disposed on a free access floor. It is supported via a ball bearing 8 on the fixed ring member 6 provided. The ball bearing 8 is held by a retainer member 9 and freely rolls on the fixed ring member 6 until it comes into contact with a wall provided on the support bolt side of the fixed ring member 6. The retainer member 9 is a fixing ring member 6
It is restored to the center by the leaf spring 13 attached to the outside.

The second moving member 4 is maintained at an appropriate gap from the cylindrical member bottom plate 2 and receives a shear viscous resistance force by the high viscous fluid 11 provided in the cylindrical member 1. Also, when the second moving plate 4 moves along with the support bolt 5 to the inner wall of the cylindrical member 1, the fixed ring member 6 is arranged at a height that does not hinder the movement of the second moving plate 4. A fixing ring member 6 in which the inner wall of the cylindrical member 1 contacts the ball bearing 8
A cushioning member 12 is provided along the inner wall of the first member.

Next, the operation of the present embodiment will be described.

In FIG. 1, the horizontal ground motion
When a horizontal seismic force is applied to the electronic device, the transmission of the seismic force to the electronic device can be suppressed by moving the first moving plate 3 supported by the ball bearing 8 together with the electronic device. A so-called seismic isolation effect is obtained in which the response acceleration of the electronic device supported by seismic isolation is reduced. First
The moving plate 3 is supported by the ball bearings 8, so that when a small earthquake occurs, the ball bearings 8 roll to move smoothly, and a good seismic isolation effect can be obtained. In addition, the movement of the electronic device is reduced due to the shear viscous resistance acting by the high viscous fluid 11 between the second moving plate 4 and the cylindrical member bottom plate 2.

During a relatively large earthquake, the ball bearing 8 contacts the wall provided inside the fixed ring member 6,
Since the moving plate 3 slides on the ball bearings 8, the frictional force becomes larger than when rolling, the friction damping effect increases, and the moving device 3 has the effect of suppressing the movement of the electronic device.
Viscous fluid 1 between the moving plate 4 and the cylindrical member bottom plate 2
The movement of the electronic device is greatly suppressed by the action of the shear viscous resistance force due to (1). Further, by providing a friction material in addition to the ball bearing 8 on the retainer member 9, the frictional force can be increased or decreased, and the frictional force can be appropriately set. As shown in FIG. 3, the second moving plate 4 collides with a shock absorbing member 12 provided on the inner wall of the cylindrical member 1 for a large earthquake motion. As the shock absorbing member 12, butyl rubber having a small coefficient of restitution is used. If used, the collision force can be greatly reduced.

When the ball bearing 8 rolls, the movement of the ball bearing 8 is only half of the moving distance of the moving plates 3 and 4. Further, after the ball bearing 8 collides with the cushioning member 12 provided on the fixed ring 6, Since the first moving member 3 slides on the ball bearing 8, the fixed ring member 6 on which the ball bearing 8 is installed can be made small, and the seismic isolation device can be made compact. When the electronic device is supported only by the ball bearing 8,
The electronic device moves with a small horizontal force,
When a relative movement is to occur between the second moving plate 4 and the cylindrical member bottom plate 2, a shear viscous resistance force acts on the high viscous fluid 11 between the second moving plate 4 and the cylindrical member bottom plate 2. Thus, movement of the electronic device can be prevented.

FIG. 4 is a longitudinal sectional view of another embodiment.
FIG. 4 shows that at least one or more movable ring members 7 are provided between the second movable plate 4 and the fixed ring member 6 in FIG. In FIG. 1, two movable ring members are provided. The movable ring member 7 gradually increases in diameter from the second moving plate 4 and is arranged so as to always overlap the facing second moving plate 4, the other movable ring members 7, and the fixed ring member 6. Since the support bolt 5 passes through the center between the fixed ring member 6 and the movable ring member 7, the second movable plate 4 is connected to the fixed ring member 6 regardless of the position of the second movable plate 4. The movable ring member 7 restricts rotation about an axis perpendicular to the paper surface.

For a large earthquake motion, the inner diameter of the movable ring member 7 is pushed by the support bolt 5 that moves together with the movable plate, and the second movable plate 4 and the movable ring member 7 are almost simultaneously Collides with the shock-absorbing member 12 provided at the first position. Since the second movable plate 4 and the movable ring member 7a, the movable ring member 7a and the movable ring member 7b, and the movable ring member 7b and the fixed ring member 6 partially overlap,
It is possible to withstand a sufficiently large overturning moment when the second moving plate 4 collides with the buffer member 12 on the inner wall of the cylindrical member 1, and it is possible to reliably prevent the electronic device from overturning.

FIG. 5 is a longitudinal sectional view of another embodiment. FIG.
2, the second moving plate 4 is supported via a ball bearing 8 installed on the bottom plate 2 of the cylindrical member 1 disposed on the free access floor, and can move freely in a horizontal plane inside the cylindrical member 1. The resistance plate 19 attached to the first moving plate 3
Since the resistance plate 19 needs to move as much as the second moving plate 4 collides with the wall of the cylindrical member 1, the device is larger than the seismic isolation device described above. Since it can be supported by the support bolt 5 via the ball bearing 8, it can be applied to an electronic device having a large load.

FIG. 6 is a longitudinal sectional view of still another embodiment. In FIG. 6, the electronic device 18 is supported and movable by a rolling member 10 arranged separately from the cylindrical member 1 arranged on the floor. The moving plate 21 connected to the electronic device via the connecting bolt 20 is located in the cylindrical member 1, secures an appropriate gap with the cylindrical member bottom plate 2, and sets a height between the moving plate 21 and the cylindrical member bottom plate 2. The viscous fluid 11 receives a shear viscous resistance force. During a large earthquake, the moving plate 21 and the cylindrical member bottom plate 2
By receiving the shear viscous resistance force by the high viscous fluid 11 set in between, the large movement of the electronic device is suppressed, and the fixed ring member 6 installed on the wall of the cylindrical member 1 allows the electronic device to move through the movable ring 7. In addition, it is possible to prevent the movable plate 21 from being lifted upward, and to prevent the movable plate 21 from tipping over. Usually, since the electronic device has casters, the support and movement mechanism of the seismic isolation device can be omitted, and the structure is simplified.

[0025]

As described above, according to the present invention, there is provided a seismic isolation device which is compact, exhibits a seismic isolation effect at the time of small and medium-sized earthquakes, and can prevent excessive movement of the electronic device at the time of a large earthquake. Can be.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view in which the seismic isolation device of the present invention is applied to an electronic device.

FIG. 3 is a diagram illustrating the operation principle of FIG. 1;

FIG. 4 is a longitudinal sectional view of another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical member, 2 ... Bottom plate, 3 ... 1st moving plate, 4 ... 2nd
Moving plate, 5 ... support bolt, 6 ... fixing ring member, 7 ...
Movable ring member, 8: ball bearing, 9: retainer member, 10: rolling member, 11: high-viscosity fluid, 12: buffer member, 13: leaf spring, 14: seismic isolation device, 15: building floor, 16 ... Pedestal member, 17 ... free access floor,
18 ... electronic device, 19 ... resistance plate, 20 ... connecting bolt, 2
1. Moving plate.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Syoji Otake 502 Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratories, Hitachi, Ltd. (72) Inventor: Tsuneo Horie, 1st Horiyamashita, Hadano-shi, Kanagawa Prefecture, General-purpose Computer Division, Hitachi Ltd.

Claims (1)

[Claims] In a seismic isolation device provided between an electronic device and a floor, a cylindrical member disposed on the floor, a support bolt for supporting the electronic device, and a first member which is located on the cylindrical member integrally with the support bolt. A moving plate, a second moving plate integrated with the support bolt and located in the cylindrical member, a fixed ring member provided on a wall of the cylindrical member, and a first moving plate installed on the fixed ring. The present invention is characterized in that a gap formed between a supporting rolling member, a second moving plate and a bottom plate of a cylindrical member is maintained, and a high-viscosity fluid is provided between the second moving plate and the bottom plate. Quake device.