JPH0674666B2 - Seismic isolation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device that can resist a falling moment due to rocking vibration generated in a building.

[Prior art]

Generally, seismic isolation devices consist of laminated rubber bearings, sliding bearings, bearing bearings, etc. and do not have the function of resisting tensile forces.

By the way, when a foundation such as a tower-like structure or an elongated pencil pill or a foundation of a machine having a high center of gravity receives rocking vibration such as an earthquake, a large overturning moment is generated.

[Problems to be solved by the invention]

Therefore, the seismic isolation device receives a tensile force in the vertical direction due to rocking vibration such as an earthquake, and when the column axial force is exceeded, the structure on the seismic isolation device may fall.

An object of the present invention is to provide a seismic isolation device capable of avoiding such a situation and ensuring the safety of a structure on the seismic isolation device.

[Means for solving problems]

The present invention relates to a seismic isolation device, in which a laminated rubber bearing and a periphery of the laminated rubber bearing are surrounded between a floor slab on the lowest floor of a structure and a foundation slab supporting the structure. Whether to attach a plurality of wire strands vertically on the outer side or vertically attach a wire strand that vertically penetrates the laminated rubber bearing,
Alternatively, a cloth-like stretchable fiber member is attached so as to surround the laminated rubber bearing, and each is attached with a sufficient length so that it can be bent in the center, and the wire strand and the fiber member are provided at both upper and lower ends. The object is achieved by fixing the part to the floor slab and the foundation so as to resist the vertical pulling force of the laminated rubber.

〔Example〕

 The present invention will be described below with reference to an embodiment shown in the drawings.

1 to 3 show a first embodiment of the present invention, in which the laminated rubber bearing 3 is surrounded by a floor slab 1 on the lowest floor of a structure and a foundation slab 2 supporting the floor slab 1. A plurality of wire strands 4 are vertically attached to the outside so as to surround the.

The laminated rubber bearing 3 has a structure in which a plurality of rubbers and steel plates are alternately stacked. The laminated rubber bearing 3 has the property of withstanding a large horizontal displacement while supporting the total load of the structure.

The wire strands 4 are PC steel stranded wires and are attached around the laminated rubber bearing 3 at regular intervals.

In addition, each wire strand 4 is attached between the floor slab 1 and the foundation slab 2 with a sufficient length so that the central portion bends, and the upper and lower ends thereof are attached to the floor slab 1.
And the foundation slab 2 are firmly fixed to the base slab 2 by fixing hardware 5,5.

With such a structure, in the event of an earthquake, the laminated rubber bearing 3
While exerting the function of the seismic isolation device main body, each wire strand 4 resists a predetermined or more pulling force in the vertical direction of the laminated rubber bearing 3 due to the overturning moment to prevent the building from overturning (see FIG. 2).

In such a case, the wire strand 4 has a sufficient length so that it can be bent in the central portion and can follow the horizontal displacement of the laminated rubber bearing 3, so that the function of the laminated rubber bearing 3 is not impaired. FIGS. 4 to 6 show a second embodiment of the present invention, in which a hollow portion A penetrating in the longitudinal direction is provided in the central portion of the laminated rubber bearing 3, and the wire strand is provided in the hollow portion A. 4 is attached in the vertical direction with a sufficient length so that it can be bent in the center. The lower end portion of the wire strand 4 penetrates the foundation slab 2 and is fixed in the support pile 6 by the fixing hardware 7. The other structure is almost the same as that of the first embodiment.

FIG. 7 shows a modified example of the second embodiment of the present invention, in which the wire strand 4 is not directly mounted in the hollow portion A, but the hollow portion A, the floor slab 1, the foundation slab 2 and the support pile 6 are provided. The sheath tube 8 made of a vinyl tube or the like is passed to a certain depth, and the wire strands 4 are inserted in the respective sheaths 8 so as to be inserted. The sheath tube 8
Grease is filled therein for the purpose of preventing a decrease in the unbonding function of the wire strand 4.

With this configuration, the wire strands 4 are attached by the so-called unbonding method, so that there is no fear that the seismic isolation function of the laminated rubber bearing 3 will be deteriorated. In order to obtain such an effect, it is necessary to secure a sufficient length l of the wire strand 4 and the sheath tube 8 so as not to impair the horizontal displacement capability of the laminated rubber bearing 3.

FIGS. 8 to 10 show a third embodiment of the present invention. In the first embodiment, instead of attaching the wire strands 4 around the laminated rubber bearing 3, the cloth-like predetermined area is vertically moved. The fiber member 9 which can be expanded and contracted is attached, and there is a margin in the length so that the central portion can be bent.
The fibrous member 9 completely covers the laminated rubber bearing 3. The upper and lower ends of the fiber member 9 are completely fixed to the floor slab 1 and the base slab 2 by a ring-shaped fixing metal 10 and a plurality of anchor bolts 11.

With such a configuration, the fiber member 9 extends and resists the vertical pulling force of the laminated rubber bearing 3 (see FIG. 10), and the laminated rubber bearing 3 is not exposed, so that it looks good in design. [Advantages of the Invention] The present invention is configured as described above, and the tensile force generated in the laminated rubber bearing by the overturning moment caused by the rocking vibration has a sufficient margin in the length so that the center portion of each can bend. Since a plurality of or one wire strand or a cloth-like fiber member having a resistance resists, it is possible to prevent the structure from falling due to rocking vibration such as an earthquake.

In the first invention, a plurality of wire strands can be arranged to cope with a large tensile force. In the second aspect of the invention, the wire strand is inserted into the laminated rubber bearing, so that it is easy to settle. Further, in the third invention, the laminated rubber bearing is not exposed, so that the finished appearance is good.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention,
1 and 2 are longitudinal sectional views of the seismic isolation device, FIG. 3 is a sectional view taken along line I-I in FIG. 1, and FIGS. 4 to 6 show a second embodiment of the present invention. 4 and 5 are longitudinal sectional views of the seismic isolation device, FIG. 6 is a sectional view taken along line II-II of FIG. 4, and FIG. 7 is a longitudinal sectional view of a modified example of the present invention.
Figures 11 to 11 show a third embodiment of the present invention,
FIG. 9, FIG. 9 and FIG. 10 are longitudinal sectional views of the seismic isolation device, and FIG. 11 is a sectional view taken along the line III-III in FIG. A: Hollow part 1 ... Floor slab, 2 ... Foundation slab, 3 ... Laminated rubber support, 4 ... Wire strand, 5 ... Fixed hardware, 6 ...
… Supporting pile, 7 …… Fixing hardware, 8 …… Sheath tube, 9 …… Fiber member, 10 …… Fixing hardware, 11 …… Anchor bolt.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshikatsu Miura 1-2-7 Motoakaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Minoru Kanabe 1-2-7 Motokasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yasuo Ogawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A-60-223576 (JP, A) JP 57-209347 (JP, A)

Claims (3)

[Claims] 1. A laminated rubber bearing between a floor slab on the lowermost floor of a structure and a foundation slab supporting the structure, and a plurality of rubber bearings located outside so as to surround the periphery of the laminated rubber bearing. The wire strands of this book are attached in the vertical direction with an allowance in the length so that they can be flexed in the center, and the upper and lower ends of this wire strand are fixed to the floor slab and foundation, and the vertical direction of the laminated rubber. A seismic isolation device characterized by being configured to resist the pulling force of. 2. A laminated rubber bearing between a floor slab on the lowest floor of a structure and a foundation slab supporting the structure, and a wire strand extending vertically through the laminated rubber bearing in the central portion. Install vertically with a sufficient length to allow bending, and fix both upper and lower ends of this wire strand to the floor slab and foundation to resist the vertical pulling force of the laminated rubber. A seismic isolation device characterized by: 3. A laminated rubber bearing between a floor slab on the lowest floor of the structure and a foundation slab supporting the structure, and a cloth-like stretchable fiber member surrounding the laminated rubber bearing. Is attached to the central part with a sufficient length so that it can be flexed, and the upper and lower ends of this fiber member are fixed to the floor slab and the foundation so as to resist the vertical pulling force of the laminated rubber. A seismic isolation device characterized in that