JP2791718B2 - Seismic isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION An object of the present invention is to provide a compact seismic isolator as a pneumatic isolator for floor seismic isolation by integrating a leveling mechanism and a damping mechanism.

[0002]

2. Description of the Related Art In a conventional seismic isolation device, as shown in FIGS.
In the seismic isolation device m, a lower plate b is disposed on a base plate g via a ball isolator f having a ball h.
The lower plate b and the upper plate a are disposed outside the air spring c and the air spring c, and are formed of an outer tube d and an inner tube e, and are guide pipes d that can extend and contract in the axial direction.
Connected with 1.

The upper plate a is provided with an air pressure supply port a1 communicating with the air chamber of the air spring c to adjust the height of the air spring.

It is used for floor seismic isolation devices, bearings for equipment seismic isolation devices, and air spring type three-dimensional seismic isolation devices. For horizontal earthquakes, seismic isolation is performed by tilting the ball and base plate. Air springs are used for seismic isolation against vertical motion earthquakes.

[0005]

However, in the prior art, 1) a guide pipe is provided on the outer peripheral side of the air spring to prevent the locking of the air spring and to make the air spring self-supporting. The ratio D / L increases. Therefore, there is a problem that the outer diameter of the guide pipe increases and the weight of the device itself also increases. 2) There is also a problem that it is difficult to attach accessory functions such as a shock absorber, a leveling valve, and a limit switch.

Accordingly, the present invention has been made in view of the above-mentioned problems of the prior art, and is intended to reduce the size of the seismic isolation device.
It aims to provide seismic isolation devices that can reduce weight.

[0007]

In order to achieve the above object, in the seismic isolation device of the present invention, a lower plate is provided on a base plate via a ball isolator.
In the seismic isolation device in which the upper plate is connected to the lower plate using an air spring and a guide pipe that can expand and contract in the axial direction, the upper plate and the lower plate are connected by an air spring and a shock absorber,
The upper plate and the ball isolator are connected by an axially extendable guide pipe arranged inside the air spring, and the upper plate is connected to a turnbuckle connected to the lower plate via a lever. An interlocking leveling valve is mounted, and a limit switch for detecting an abnormal height of the air spring is provided.

[0008]

[Action] In the event of a vertical motion earthquake, the air spring is guided by the guide pipe to expand and contract. At this time, the damping action of the shock absorber works to prevent resonance of the air spring.

The leveling valve mounted on the upper plate swings and rotates the valve shaft via a turnbuckle and a lever. Since the leveling valve has a time delay function, the valve is closed (no air supply or exhaust) at the frequency of the earthquake. On the other hand, if the load changes statically due to a change in the layout of the floor load or a change in the load, the air spring will be displaced, and the leveling valve will rotate the valve shaft and supply or exhaust air until the lever is horizontal. Perform and keep the air spring at the specified height. The limit switch detects an abnormality in the height of the air spring, and issues a warning using a separate means.

[0010]

An embodiment will be described with reference to the drawings. In FIG. 1 to FIG. 4, the present invention provides
A seismic isolation device in which the lower plate 2 is disposed via a ball isolator 9 and the upper plate 1 is connected to the lower plate 2 using an air spring 4 and an axially extendable guide pipe 5. It is.

An air spring 4 having an air chamber 41 is connected between the upper plate 1 and the lower plate 2 by bolts 42, and a shock absorber 6 is attached to the outer peripheral side of the air spring 4 via a bracket 61. Are linked.

The upper plate 1 and the ball isolator 9 are arranged inside the air spring 4 and are connected by a guide pipe 5 which can expand and contract in the axial direction.

The guide pipe 5 has an air chamber 53 inside.
The outer tube 51 and the inner tube 52
The outer tube 51 is provided at a predetermined position in the outer tube 51 with an air chamber through-hole 43 communicating with the air chamber 41 of the air spring 4.
The upper end of 1 is attached to the upper plate 1 substantially vertically.

The inner tube 52 has a sliding portion 55
The ball isolator 9 is attached at the lower end to the inside of the outer tube 51 via a.

Further, at the lower end of the inner tube 52,
A horizontal plate 56 is attached, and the horizontal plate 56 is connected to the base plate 3 at a fixed height via bolts 31.
In addition, a passage 11 communicating with the air chamber 41 is provided in the upper plate 1, and a leveling valve 7 having an air supply port 71 and having an automatic height adjustment valve is attached to the passage 11. . This leveling valve 7 has a time delay function, and does not open the valve at the frequency of the earthquake, ie, supply air,
It is sealed without exhausting.

The leveling valve 7 rotates the valve shaft when the air spring 4 is displaced due to a static change in load due to a change in the layout of the floor load or an increase or decrease in the load, so that the lever 72 becomes horizontal. Up to this point, air is supplied or exhausted to keep the air spring 4 at a specified height.

The turnbuckle 8 has an exhaust valve 81 at its lower end.
The lower end of the turnbuckle 8 is swingably connected to the lower plate 2, and the upper end is connected to the leveling valve 7 via a lever 72.

A dog 10a is mounted on the upper plate 1, and a limit switch 10 for detecting an abnormality in the height of the air spring 4 is installed on the dog 10a.

FIGS. 3 and 4 show another embodiment of the seismic isolation device. In FIG. 3, two shock absorbers 6 are assembled at one position, and in FIG. 4, the air springs 4 are doubled. It is what it was.

[0020]

Since the present invention is configured as described above, the following effects can be obtained.

Since the guide pipe is disposed inside the air spring, the fitting ratio D / L of the guide pipe is reduced, so that the overall size can be reduced and the overall weight can be reduced.

Further, it is possible to improve the slidability by minimizing the tilting displacement, and to reduce the overall height by incorporating the running portion into the inner tube of the guide pipe. Therefore, the effect is particularly large for a large model.

Further, since the leveling valve, the air spring, the shock absorber, the limit switch and the like are integrated, the workability is easy and the overall height can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of the present apparatus.

FIG. 2 is a plan view of the present apparatus.

FIG. 3 is a plan view of another embodiment of the present apparatus.

FIG. 4 is a partial sectional view of another embodiment of the present apparatus.

FIG. 5 is a front view of a conventional seismic isolation device.

FIG. 6 is a perspective view of a seismic isolation base to which a conventional seismic isolation device is attached.

[Description of References] 1 Upper plate 2 Lower plate 3 Base plate 4 Air spring 5 Guide pipe 6 Shock absorber 7 Leveling valve 72 Lever 8 Turnbuckle

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryuichi Isonami 1-12-1 Asamizodai, Sagamihara City, Kanagawa Prefecture Inside Kayaba Industry Co., Ltd. No. 1 Kashima Construction Co., Ltd. Technical Research Institute (56) References JP-A-59-212552 (JP, A) JP-A-1-303335 (JP, A) JP-A-60-23645 (JP, A) Showa 64-649 (JP, U) Actually open Showa 63-115644 (JP, U) Actually open Hei 3-80137 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16F 15 / 04 E04H 9/02 331

Claims (1)

(57) [Claims] 1. A seismic isolation device in which a lower plate is disposed on a base plate via a ball isolator, and the upper plate is connected to the lower plate by using an air spring and a guide pipe that can expand and contract in the axial direction. In the above, the upper plate and the lower plate are connected by an air spring and a shock absorber, and the upper plate and the ball isolator are connected by an axially extendable guide pipe disposed inside the air spring. A seismic isolation device with an upper plate fitted with a leveling valve linked to a turnbuckle connected to the lower plate via a lever, and a limit switch installed to detect abnormal air spring height.