JP4073407B2 - Seismic isolation devices for building structures - Google Patents

Description

The present invention relates to a seismic isolation device suitable for construction between a foundation and a foundation in a building structure, particularly a wooden building structure.

Various structures have been proposed for seismic isolation structures for buildings, but in relatively lightweight buildings such as wooden houses, the base isolation structure is built into each independent foundation or the foundation is fixed. As a continuous fabric foundation, a seismic isolation structure was incorporated between the upper surface and the upper surface of the foundation.

However, recently, it is said that a seismic isolation device using a sphere is the best as a seismic isolation device for a relatively light building such as a house, and a substrate having a dish-shaped concave surface to provide a restoration function. A bearing ball placed thereon (see, for example, Patent Document 1) or an annular wall provided to prevent the bearing ball from deviating from the substrate when the amplitude is too large (for example, Patent Document 2). Have been proposed).

In addition, seismic isolation devices (see, for example, Patent Document 3) in which a plurality of spheres are juxtaposed in the horizontal direction between upper and lower metal positions, and those using a sphere and a spring in combination (for example, see Patent Document 4) have been proposed. Yes.

Japanese Patent Laid-Open No. 10-8571 Japanese Patent Laid-Open No. 10-252312 JP 2001-20999 A JP-A-8-246704

However, the proposed seismic isolation device using a spherical body is generally used for horizontal shaking, and is not sufficient to absorb vertical shaking. There was a problem that the shock shock of the earthquake could not be absorbed enough.

Especially in the case of wooden buildings, sufficient seismic isolation effect is required not only in the horizontal direction but also in the vertical direction in response to direct earthquakes.

The present invention addresses the actual situation as described above, and in particular, by using a vertical arrangement of a plurality of spheres together with a spring and a reinforcing rubber body, it absorbs horizontal and vertical vibrations and not only rolls. The purpose of this is to provide seismic isolation effects to vertical shaking caused by direct earthquakes, etc., and to reduce the risk of building collapses and falls.

And in order to achieve the above-mentioned object, the present invention provides a seismic isolation device installed between a concrete foundation and a building foundation via an H-shaped steel, and a cylinder made of a reinforced elastic body standing on the concrete foundation. the Jo body as the substrate, the upper surface side of the cylindrical body is fastened to the H-shaped steel through the iron plate, the co when fastened together in a concrete foundation by placing the iron plate in the center portion lower side, top and bottom and continuously to set the bowl-shaped cup by a bottom and a top and bottom was allowed forming recesses in container stacking at least two upper and lower stages via an elastic spring that is along the inner wall surface bears against the tubular body portion, the recess A sphere of a required size is accommodated in the inside so as to be freely rotatable.

A second aspect of the present invention is a preferred mode of the elastic spring interposed in the cylindrical body, and is characterized by using a coil spring.

When the above-mentioned seismic isolation device of the present invention is installed on a concrete foundation, installed with an H-shaped steel between the building base at the bottom of the pillar, and the upper part is fixed to the H-shaped steel and the lower part is fixed to the concrete foundation. The vertical vibration is absorbed by the frictional force caused by the free rotation of a plurality of spheres accommodated in the bowl-shaped cup recess so as to freely rotate. On the other hand, the sphere, the sphere and the elastic body against the horizontal vibration. Is absorbed through the elastic body → elastic spring → bowl-shaped cup → sphere due to a synergistic effect with the elastic spring such as a coil spring and the elastic body of the cylindrical body interposed between Can be suppressed.
In addition, the elastic spring prevents the sphere from coming out of the recess of the inner bowl-shaped cup against the vibration in the horizontal direction and the vertical direction, and the vibration caused by the free rotation of the sphere accommodated in the bowl-like recess. Make absorption more certain.

Hereinafter, an embodiment of the present invention will be described in the case of a wooden building shown in FIG.

In the figure, reference numeral 1 denotes a concrete foundation. In the present invention, an H-shaped steel 5 is placed between the concrete foundation 1 and a base 4 below a column 3 standing on the wooden floor F side end inside the upper outer wall 2. It is configured by placing a seismic isolation device through.

Of course, the pillar includes corner pillars, side pillars, partitions, and the like, and the seismic isolation device of the present invention is arbitrarily selected and installed on the base of each pillar as needed.

In the above configuration, the seismic isolation device constituting the main part of the present invention has a cylindrical body 6 made up of a reinforcing elastic body such as a rubber containing a reinforcing material such as a wire as a base in the figure. The upper surface side is fixed to the H-shaped steel 5 at the lower part of the base 4 via an iron plate, for example, four places by bolts 7 in the illustrated example, while the lower surface side is arranged with a steel plate 9 at the center and bolts 8. In the case of the example shown, it is fixed to the horizontal concrete foundation 1 by fastening at four places.

The cylindrical body 6 has an elastic spring 10 made of a coil spring or the like installed along the inner wall surface of the cylindrical body 6. Cup cups 11 are formed in series at the bottom and formed with recesses for holding spheres at the top and bottom, respectively. At least two cup cups 11 in the illustrated example are inserted in three layers, and spheres are formed between the recesses facing each other. 12 is rotatably accommodated and held, and is configured as a main part of the seismic isolation device.

Here, it is effective if the number of the spheres 12 and the number of the cup containers 11 are two or more, and it is not preferable that only one tier requires an excessively large sphere.

In addition, it is important that the sphere 12 is rotatable in the recess of the bowl-shaped cup. If there is no rotation, no frictional force is generated between the inner surface of the bowl-shaped cup and the vibration suppressing effect. If there is no cup-shaped cup, frictional force is generated by the spheres, which causes wear of the sphere.

Therefore, as the seismic isolation device in the present invention, a combination of a cylindrical elastic body 6, an elastic spring 10, a bowl-shaped cup container 11, and a sphere 12 is required, whereby an elastic body → an elastic spring → a bowl-shaped cup → a sphere. Vibration absorption is achieved by the propagation of vibration.

A concrete foundation is made into a solid foundation with a thickness of 15 to 20 cm, and a rubber cylinder with a wire of about 35 cm having a lower surface wider than the upper surface, a diameter of 30 cm and a hole diameter of 8.5 cm in the center is bolted on the foundation. 4 places.

Then, a coil spring is attached to the cylindrical body, and a pair of bowl-shaped cups are joined to each other by the bottoms thereof, and a bowl-shaped cup container is formed with the depression facing outward. Each of the spheres was held, and three bowl-shaped cup containers and four spheres held therein were accommodated.

An iron plate was placed on the upper surface of the rubber cylinder thus disposed, and an H-shaped steel having a height of 15 cm was placed thereon, and was fixed at four locations with the upper surface of the rubber cylinder and bolts.

At this time, the distance from the top surface to the bottom surface of the cylindrical body was approximately 35 cm. Moreover, it was about 35 cm from the cylindrical body upper surface to the floor surface.

Thus, when the above seismic isolation device was formed, the base isolation was placed on the top of the H-shaped steel, and the pillars such as side columns, corner columns, and partitions were placed to obtain the seismic isolation device for the wooden house according to the present invention. .

The seismic isolation device of the present invention is particularly effective as a seismic isolation device for a wooden house. However, the seismic isolation device can be used not only in a wooden house but also in other buildings and can achieve the same effect.

It is a schematic sectional drawing which shows one example of the seismic isolation apparatus which concerns on this invention.

Explanation of symbols

1: Concrete foundation

3; pillar

4; foundation

5; H-shaped steel

6; Reinforcing elastic body

9; Iron plate

10; Elastic spring

11; bowl-shaped cup container

12: Sphere

Claims (2)

A seismic isolation device installed via a H-shaped steel between a concrete foundation and a building foundation,
It consists of a cylindrical body composed of a reinforced elastic body standing on a concrete foundation, and the cylindrical body is fixed to the H-shaped steel on the upper surface side through an iron plate, and an iron plate is disposed in the center on the lower surface side of the concrete. co Once secured integrally to the base, and continuously provided on the lower bowl-shaped cup series by a bottom, which is spliced along the inner wall surface of the vessel was allowed recesses vertically to said tubular body portion A seismic isolation device for a building structure, wherein at least two upper and lower layers are stacked via an elastic spring, and a spherical body of a required size is accommodated in the recess so as to be freely rotatable.
The seismic isolation device for a building structure according to claim 1, wherein the elastic spring interposed in the cylindrical body is a coil spring.

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