JPH05106678A - Laminated rubber bearing - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a laminated rubber bearing which can have a long period, has a large horizontal deformation capability, and does not cause buckling of the laminated rubber. [Structure] A rubber bag 2 is attached to the inside of a laminated rubber 1 formed in a ring shape. An upper plate 4 and a lower plate 5 for installation are provided above and below the laminated rubber 1 and the bag body 2. A fluid such as compressed air is injected into the bag body 2 through the inlet 3 to inflate the bag body 2 in the vertical direction. The compressed air in the bag body 2 bears all or part of the vertical load acting on the laminated rubber bearing A, and prevents the ring-shaped laminated rubber 1 from buckling. The horizontal rigidity of the ring-shaped laminated rubber 1 is small, and long-period laminated rubber support is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated rubber bearing for use in a seismic isolation structure or a dynamic damper.

[0002]

2. Description of the Related Art Conventionally, various structures using laminated rubber bearings have been developed as seismic isolation structures for reducing seismic input to superstructures, etc. Appeared all at once ", Nikkei Architecture 1
See the July 14, 986 issue, pages 54-75). The most common conventional laminated rubber bearing is one in which steel plates and rubber are alternately stacked, and mounting plates are provided one above the other for mounting on a lower structure such as an upper structure or a foundation. In addition to these, there are those using high-damping rubber, those having a lead plug damper incorporated therein, and the like.

[0003]

Conventionally, the natural period of laminated rubber bearings used for seismic isolation structures is up to about 2.0 seconds, and the conventional shape has a horizontal period for long periods of 2.0 seconds or more. It was difficult to make a laminated rubber with low rigidity.

Further, a laminated rubber having a large allowable horizontal deformation capacity also has a problem of buckling due to a large vertical load, and it has been difficult to make it.

The present invention is intended to solve the above-mentioned problems, and provides a laminated rubber bearing which can have a long period, has a large horizontal deformation capability, and is less likely to buckle. is there.

[0006]

In the laminated rubber bearing of the present invention, the laminated rubber portion is formed in a ring shape, and an inflatable fluid injection portion is provided inside thereof.

As the fluid injecting portion, a flexible bag body such as a rubber bag body can be used. But,
The present invention is not limited to this, and may be a bag body using a part of metal, or a body integrated with a laminated rubber portion.

A fluid such as compressed air (not only gas but also fluid such as water) may be injected into the fluid injection portion, and the vertical load can be supported by the pressure. This is because the bag body or the like into which the fluid is injected is constrained by the ring steel plate in the ring-shaped laminated rubber and can be expanded only in the vertical direction. The fluid injecting section can inject the fluid after installation by providing an injecting port in the bag body or the like constituting the fluid injecting section. Also,
An air spring having a predetermined spring constant in the vertical direction may be used as the fluid injection part.

The laminated rubber bearing of the present invention may be used as a seismic isolation bearing in a seismic isolated structure (such as a high-rise building,
Conventionally, it is also applicable to a structure having a long natural period, which is difficult to apply a seismic isolation structure), as well as applications as a spring element of a dynamic damper for vibration control.

[0010]

[Function] Since a large vertical load applied to the laminated rubber bearing is supported by fluid pressure such as compressed air, and the ring-shaped laminated rubber provides horizontal rigidity, the laminated rubber with low horizontal rigidity provides a long-period seismic isolation structure or You can make dynamic dampers.

By adjusting the fluid pressure, it is possible to change the rigidity of the laminated rubber bearing and adjust the natural period of the bearing.

[0012]

EXAMPLES Next, the illustrated examples will be described.

FIG. 1 shows a vertical section in one embodiment of the present invention, and FIG. 2 shows a horizontal section.

The laminated rubber 1 constituting the laminated rubber bearing A is formed in a ring shape, and although the steel plate is omitted in the drawing, the ring rubber and the ring steel plate horizontally embedded in the rubber are shown. Are alternating layers in the vertical direction.

Inside the ring-shaped laminated rubber 1, that is, inside the ring, a rubber bag 2 is mounted.
Further, an upper plate 4 and a lower plate 5 for installation are attached above and below the laminated rubber 1 and the bag body 2, and can be fixed to the structure or the weight of the dynamic damper with a bolt 7. In the figure, 6 denotes bolt holes formed in the upper plate 4 and the lower plate 5.

The bag 2 is inflated by injecting compressed air from an injection port 3 provided through the laminated rubber 1, and the weight of the upper structure or the dynamic damper (added mass) in the seismic isolation structure is expanded by the pressure of the compressed air. ) And other vertical loads.

The laminated rubber bearing A is installed with the structure or weight supported by a jack or other bearing, and is installed before injecting compressed air, and then compressed air is injected into the bag body 2. Good. In addition, when removing for maintenance or replacement, the compressed air in the bag body 2 can be removed easily.

FIG. 3 shows, as another embodiment, a vertical cross section when an air spring 8 is used for the bag body 2 portion in the above embodiment. By setting the vertical spring constant of the air spring 8 to a predetermined value, it is possible to effectively absorb not only horizontal vibration but also vertical vibration.

FIG. 4 shows another embodiment in which the upper and lower ends of the ring-shaped laminated rubber 1 are formed of disc-shaped rubber plates 9 so that the fluid injection portion is integrally molded in the laminated rubber 1 in the vertical direction. It shows a cross section. Also in this embodiment, compressed air or the like is injected through the injection port 3 and the pressure supports the vertical load.

[0020]

EFFECTS OF THE INVENTION Since a large vertical load applied to a laminated rubber bearing is supported by a fluid pressure such as compressed air, it is possible to form a long-period seismic isolation structure, a dynamic damper or the like with laminated rubber having a small horizontal rigidity.

Since the vertical load does not act directly on the laminated rubber, it is possible to prevent the laminated rubber from buckling.

A large horizontal deformation capability can be expected due to the laminated rubber having low rigidity in the state where the fluid supports the vertical load.

By adjusting the pressure in the fluid injecting portion, the rigidity of the laminated rubber bearing as a whole can be changed and the natural period of the bearing can be adjusted.

If the fluid injecting portion is formed by a vertical air spring, it is possible to absorb vertical vibration.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a laminated rubber bearing of the present invention.

FIG. 2 is a plan view corresponding to FIG.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the laminated rubber bearing of the present invention.

FIG. 4 is a vertical sectional view showing still another embodiment of the laminated rubber bearing of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ring-shaped laminated rubber, 2 ... Bag body, 3 ... Injection port, 4 ... Upper plate, 5 ... Lower plate, 6 ... Bolt hole, 7 ... Bolt, 8 ... Air spring, 9 ... Disc-shaped rubber plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kihide Oga 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Isao Nishimura 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd.

Claims (6)

[Claims] 1. A laminated rubber bearing characterized in that an inflatable fluid injection portion is provided inside a laminated rubber formed in a ring shape. 2. The laminated rubber bearing according to claim 1, wherein the fluid injecting portion is a flexible bag mounted inside the laminated rubber formed in a ring shape. 3. The laminated rubber bearing according to claim 2, wherein the bag body is a vertical air spring. 4. The laminated rubber bearing according to claim 1, 2 or 3, wherein the bag is provided with an inlet for injecting a fluid. 5. The laminated rubber bearing according to claim 1, wherein the fluid injection portion is integrally formed with the laminated rubber formed in a ring shape. 6. The laminated rubber bearing according to claim 1, wherein an upper plate and a lower plate for installation are attached respectively above and below the laminated rubber formed in a ring shape.