JP2001074095A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation device capable of displaying a sufficient base isolation effect regardless of its simple constitution because base isolation structuring of a low building of a general housing, etc., is desired as a large earthquake recently occurs in various areas of the world though development of a base isolation device which can be corresponded to a small scale building such as a housing, etc., is conventionally small. SOLUTION: This base isolation device is a device sealing an object made by laminating alternately laminating rubber 4 and sliding support parts in a support outer part by forming the support outer part by providing collar parts on upper and lower end parts of a cylindrical rubber body, forming an upper part disc 5 and a lower part disc 6 by assembling fronts and backs of a plural number of plates different in material quality, providing hollow parts in central inner parts by laminating these upper and lower discs 5, 6 and forming the laminated rubber 4 by laminating a plural number of annular rubber plates and cover bodies 12 are installed on upper and lower collar parts 11 of the support outer part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device mainly installed in a low-rise building.

[0002]

Conventionally, seismic isolation devices are RC
Various types of structures installed on large-scale buildings such as SRC structures have been developed, but there have been few developments of seismic isolation devices that can accommodate small-scale structures such as houses. However, recently, as major earthquakes occurred around the world,
There is a growing demand for seismic isolation of low-rise buildings such as ordinary houses. In view of such circumstances, the present applicant has been conducting various researches and developments on the seismic isolation structure of a low-rise building (for example, Japanese Patent Application Nos. 10-2586087 and 10-34).
6436, Japanese Patent Application No. 11-157762).

[0003] The present invention is a further development of the above-mentioned applicant, and it is an object of the present invention to provide a seismic isolation device having a simple structure and yet exhibiting a sufficient seismic isolation effect. I have.

[0004]

In order to achieve the above object, according to the present invention, a flange is provided at the upper and lower ends of a cylindrical rubber body to form a bearing exterior, and a plurality of plates made of different materials are formed on the front and back. Combine to form an upper disk and a lower disk, stack the upper and lower disks, provide a hollow portion inside the center, insert a disc-shaped stopper with a planar gap in the hollow portion, and None, a plurality of annular rubber plates are stacked to form a laminated rubber, and a laminate of the laminated rubber and the sliding bearing portion is sealed in the outside of the bearing. A lid is attached to the portion.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given based on the illustrated embodiment. The present invention is an apparatus for not transmitting vibrations due to an earthquake directly to a building, and has a configuration in which sliding portions are stacked as shown in FIG.

First, the components will be described with reference to FIG.
Denotes a plate 1 for preventing the laminated rubber from shifting.
The displacement preventing plate 1 is made of a very thin steel plate and includes a circular piece 2 and an edge frame piece 3.

FIG. 2 shows the laminated rubber 4. This laminated rubber 4 is formed by laminating two annular rubber pads 4a, 4a having a required width dimension. In this case, a slip prevention plate made of steel may be separately provided (not shown).

FIG. 3 shows the upper disk 5.
The upper disk 5 is formed by fixing a disc-shaped plate 5a made of a synthetic resin such as a nylon resin and an annular plate 5c made of a polyacetal resin and having a perfect circular hole 5b formed in the center of a perfect circle. ing. Disc-shaped plate 5
a is provided with a concave portion 5d substantially equal to the width of the edge frame of the laminated rubber 4 along the outer periphery, and a concave portion e is provided concentrically on the back surface, and a convex portion provided on the plate 5c is provided. 5f
The disc-shaped plate 5a and the annular lower plate 5c are combined and fixed by fitting
The upper disk 5 is formed so that b appears on the back surface.

Reference numeral 6 denotes a lower disk. The lower disk 6 has the same configuration as that of the upper disk 5, but the material of the disk-shaped plate 5c is different from other nylon resins, and the annular plate is made of nylon resin. In assembling, the front and back are reversed so that the perfect circular concave portion 5b comes to the front.

Then, the upper disk 5 and the lower disk 6
Are formed as hollow portions, and a disc-shaped stopper 7 made of nylon and having a small diameter is inserted into the hollow portion with a gap in a plane to form a sliding bearing portion 8. (See FIG. 4).

FIG. 5 shows the sliding bearing 8 and a bearing outer 9 for enclosing the laminated rubber 4. Outside this bearing 9
Has a steel flange 11 provided on the upper and lower peripheral edges of the cylindrical rubber body 10. Bolt holes 11a are formed in the flange 10 at regular intervals.

FIG. 6 shows a lid 12 for closing the upper and lower ends of the support exterior 9. The lid 12 is formed in a disk shape, and bolt holes 12a are formed at regular intervals on its peripheral edge so as to correspond to the flange 11 of the cylindrical rubber body 9, and are formed in the bolt holes 12a. The bolt 13 is pivotally mounted.

Each of the members constituting the seismic isolation device according to the present invention is constituted as described above.
Is filled with a laminated rubber 4 and a sliding bearing 8. That is, as shown in FIG. 7, a lid 1 in which a circular piece 2 and an edge frame piece 3 of a rubber slippage prevention plate 1 are attached to the lower end of a bearing outer 9 with an edge frame interval of laminated rubber separated by a distance.
2, the laminated rubber 4, the sliding bearing 8 composed of the upper disk 5, the lower disk 6, and the stopper 7 are alternately laminated in the cylindrical rubber body 10, and filled in the cylindrical portion 10 of the bearing outer 9. At the upper end of the cylindrical rubber body 9, the circular piece 2 and the edge frame piece 3 of the plate 1 for preventing the displacement of the laminated rubber
The lid 12 is attached with the edge frame dimension separated and attached, and the laminated rubber 4 and the slide bearing 8 are sealed. Note that, in this case, the laminated rubber 4 is
Is supported by the concave portion 5d provided in the first position so as not to shift.

The above seismic isolation device according to the present invention is installed so as to straddle between the foundation of the building frame and the floor beam.

[0015]

Since the present invention has the above configuration, it has the following effects. 1) The rigidity can be freely adjusted by changing the thickness and width of the laminated rubber between the sliding bearings. 2) In the sliding bearing portion, an optimum coefficient of friction can be obtained by overlapping a plurality of discs made of different materials. 3) The maximum displacement can be adjusted by changing the size of the stopper inserted between the superposed disks. 4) Lightening can be expected by providing more gaps between the disks as compared with the conventional sliding bearing.

[Brief description of the drawings]

FIG. 1A is a plan view of a slip prevention plate, and FIG.
End view of the circular piece and the edge frame piece,

2A is a plan view of a laminated rubber, and FIG. 2B is a cross-sectional view thereof.

3A is a plan view of an upper disk, and FIG. 3B is a cross-sectional view of the lower disk.

FIG. 4 is a cross-sectional view showing a state where upper and lower disks and laminated rubber are stacked.

5A is a plan view of the outside of the bearing, and FIG.

6A is a plan view of the lid, and FIG. 6B is a cross-sectional view thereof.

FIG. 7 is a sectional view of the seismic isolation device of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 slip prevention plate 2 circular piece 3 edge frame piece 4 laminated rubber 5 upper disk 6 lower disk 7 stopper 8 sliding bearing 9 outer bearing 10 cylindrical rubber body 11 flange 12 lid 13 bolt

Claims (4)

[Claims] An upper disc and a lower disc are formed by combining a front and a back of a plurality of plates made of different materials to form a bearing exterior by providing a flange at the upper and lower ends of a cylindrical rubber body,
The upper and lower discs are stacked to form a hollow portion in the center, and a disc-shaped stopper is inserted in the hollow portion with a gap in a plane to form a sliding support portion, and the annular rubber plate is restored. A laminated rubber is formed by stacking the laminated rubber, and the laminated rubber and the sliding bearing are alternately stacked and sealed in the outside of the bearing, and a lid is attached to the lower flange above the outside of the bearing. A seismic isolation device characterized by the following. 2. A disk for cutting off is formed concentrically, a peripheral portion is formed as an edge frame piece and a central portion is formed as a circular piece to form a slip preventing plate. The slip preventing plate is formed between the laminated rubber and the lid. The seismic isolation device according to claim 1, wherein the piece and the edge frame piece are sandwiched respectively. 3. An upper disk and a lower disk are each formed in a circular shape and each have a disk-shaped plate provided with an annular concave portion having substantially the same width dimension as the laminated rubber along a peripheral edge, and a circular hole in a central portion. The upper disk and the lower disk are stacked in the opposite directions, and the circular hole portion is formed as a hollow portion, and the stopper is formed in a disk shape. Claim 1 or 2
The seismic isolation device described. 4. The disk-shaped plate of the upper disk is made of nylon resin, and the annular plate is made of polyacetal resin.
The seismic isolation device according to claim 3, wherein the disk-shaped plate of the lower disk is made of nylon resin, and the annular plate is made of nylon resin.