JP4371845B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device using a rubber ball, and more particularly to a seismic isolation device that always exhibits good seismic isolation performance.

  In recent years, seismic isolation devices that use rubber balls have been proposed as seismic isolation devices for detached houses. A plurality of rubber balls are arranged between the upper structure and the lower structure so that they can roll, and the rubber balls roll between the upper structure and the lower structure while undergoing shear deformation during an earthquake. Thus, the vibration of the earthquake transmitted to the building is attenuated (see, for example, Patent Document 1).

However, in the above-described seismic isolation device using rubber balls, even when the rubber balls are distributed and arranged in a well-balanced manner between the upper and lower structures at the time of installation, as shown in FIG. However, there was a problem that the seismic isolation performance was adversely affected. In FIG. 5, reference numeral 11 denotes a lower structure.
JP-A-11-303289

  An object of the present invention is to provide a seismic isolation device that can always exhibit good seismic isolation performance in a seismic isolation device using rubber balls.

The present invention to achieve the above object, in a seismic isolation device arranged rollable plurality of rubber balls while subjected to shear deformation in the vertical plane of the rigid plates of the upper and lower rigid plates, the upper and lower wherein the plurality of rubber balls pressed against the upper and lower ends to the rigid plate, respectively is arranged a frame provided with a plurality of housing spaces for housing rollably by Zaisa through a gap on the side surface side individually, the accommodating space the upper end of the side wall portion of the housing space so as to fit position-decided the rubber bulb within the periphery of the flexible member from the upper end comprising a resin film which projects annularly toward the inside the housing space provided Rutotomoni, a slit in the circumferential direction of the plurality of locations of the peripheral edge, and characterized in that a plurality of projections slidably abut on the lower rigid plate on the lower surface of the frame.

  According to the seismic isolation device of the present invention having the above-described configuration, the rubber ball is always maintained in the frame body even if it rolls at the time of an earthquake. Therefore, good seismic isolation performance can always be exhibited.

  In addition, when installing the seismic isolation device, the rubber balls can be easily placed at a predetermined position between the upper and lower hard plates, so that the installation can be facilitated and the rubber balls do not fall apart. It can be easily replaced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show an example of the seismic isolation device of the present invention, where 1 is an upper hard plate on which a building is placed, 2 is a lower hard plate laid on a foundation base, and 3 is disposed between upper and lower hard plates. The rubber balls 4 are frame bodies for separately accommodating the rubber balls 3.

  The upper hard plate 1 and the lower hard plate 2 are each formed in a rectangular shape from a steel plate, and the upper hard plate 1 has a lower surface 1a and an upper surface 2a of the lower hard plate 2 with upper and lower fence portions 5 along the peripheral edge thereof. 6 are projected in a ring shape.

  A rubber sheet 7 is attached to the outer peripheral surface 6a of the lower fence 6 in an annular shape along the outer peripheral surface 6a. The rubber sheet 7 protrudes upward so as to reach the upper shelf part 5 from the fence part 6, closes a gap generated between the upper and lower fence parts 5, 6, and prevents foreign matter from entering the fence parts 5, 6. I am doing so.

A frame 4 is arranged between the upper and lower hard plates 1 and 2 in the fence portions 5 and 6. The frame body 4 is formed by forming a plurality of through-holes having a circular cross section penetrating up and down at a predetermined interval in a rectangular parallelepiped block body 4A, and the through-holes open to the top and bottom of the frame body 4 with rubber balls 3. The housing space 4B.

  The height of the block body 4A is smaller than the diameter of the rubber ball 3, and when the rubber ball 3 is accommodated in each accommodating space 4B, each rubber ball 3 contacts the upper and lower hard plates 1 and 2 (the seismic isolation device). It can be rolled in the event of an earthquake.

  As a material constituting the block body 4A, any material can be used as long as it can classify rubber balls. Preferably, the material is lightweight, and examples thereof include polystyrene foam, wood, and resin. . Among these, it is particularly desirable to use polystyrene foam because it is lightweight and inexpensive.

  As shown in FIGS. 3 and 4, at the upper end of the side wall portion 4C surrounding the accommodation space portion 4B of the frame 4, the rubber ball 3 is positioned away from the side wall portion 4C and positioned on the center side in the accommodation space portion 4B. The flexible member 8 protrudes toward the accommodating space 4B side.

  The flexible member 8 is composed of a resin film 8X, and the resin film 8X is fixed to the entire upper surface of the block body 4A. In the resin film 8X, a circular hole 8A having a diameter smaller than that of the accommodation space 4B is formed at a position corresponding to the accommodation space 4B, and a peripheral edge 8B adjacent to the hole 8A projects in an annular shape at the upper end of the side wall. ing.

  The annular peripheral edge 8B has slits 8C formed at a plurality of locations so that the peripheral edge 8B protruding when the rubber ball 3 hits during rolling is easily bent so that the rolling operation of the rubber ball 3 is not hindered. ing.

  A plurality of protrusions 9 slidably contacting the upper surface 2a of the lower hard plate 2 are fixed to the lower surface of the block body 4A of the frame body 4, and the frame body moves along with the rolling of the rubber ball 3. 4 is easily moved with respect to the lower hard plate 2. Such a protrusion 9 can be easily formed by, for example, implanting a bolt so that the head is exposed on the lower surface of the block body 4A.

  According to the present invention described above, the rubber balls 3 are always maintained in the frame body 4 by arranging the frame bodies 4 that divide the rubber balls 3 so that they can roll between the upper and lower hard plates 1 and 2. Therefore, even if it rolls during an earthquake, it will not fall apart. Accordingly, it is possible to always exhibit good seismic isolation performance.

  In addition, since the positioning of the rubber balls 3 between the upper and lower hard plates 1 and 2 can be easily performed during the installation of the seismic isolation device, the installation becomes easy and the rubber balls 3 do not fall apart. Can also be done easily.

  In the present invention, the frame body 4 has the block body 4A formed in a rectangular parallelepiped shape in accordance with the shape of the hard plates 1 and 2. However, as long as the shape matches the shape of the hard plates 1 and 2, a cylindrical shape or a triangular prism shape. A block body such as can also be used.

  Further, in the above embodiment, the frame body 4 is configured to form the accommodating space portion 4B in the block body 4A, but instead of the block body 4A, the frame body member is configured to have the accommodating space portion 4B by combining frame plate members. Any configuration may be adopted as long as each rubber ball 3 can be divided so as to be able to roll.

It is a top view which is partially cut away and shows an example of the seismic isolation device of the present invention with the flexible member removed. It is a front view which shows the seismic isolation apparatus of FIG. 1 in a partial cross section. FIG. 3 is an enlarged view of a main part of FIG. 2. In FIG. 3, it is explanatory drawing which looked at the flexible member from the inside of the accommodating space part of a frame. In the conventional seismic isolation apparatus, it is explanatory drawing which shows the state from which the rubber ball fell apart.

Explanation of symbols

1 Upper hard plate
2 Lower hard plate 3 Rubber ball
4 Frame 4A Block
4B accommodation space 4C side wall
5, 6 Fence part 7 Rubber sheet
8 Flexible member 8X Resin film
9 Protrusion

Claims (3)

In the seismic isolation device in which a plurality of rubber balls that can roll while being subjected to shear deformation are arranged between upper and lower planar hard plates, the upper and lower ends are pressed against the upper and lower hard plates between the upper and lower hard plates. place a frame provided with a plurality of housing space for housing a plurality of rubber balls and rollably respectively allowed Zaisa through a gap on the side surface side individually position-decided Me said rubber bulb within the housing space the upper end of the side wall portion of the housing space so that, Rutotomoni provided a peripheral portion of the flexible member from the upper end comprising a resin film which projects annularly toward the inside the housing space, the peripheral of the peripheral edge A seismic isolation device in which slits are formed at a plurality of locations in a direction, and a plurality of protrusions that are slidably contacted with the lower hard plate are provided on the lower surface of the frame. The seismic isolation device according to claim 1 , wherein a fence portion is provided on the lower surface of the upper hard plate and the upper surface of the lower hard plate so as to protrude in the vertical direction so as to surround the outside of the frame body along the peripheral edge portion thereof. The seismic isolation device according to claim 1 or 2 , wherein the frame body is made of polystyrene foam.

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