JPH069260Y2 - Seismic isolation device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a seismic isolation device installed between the ground and a foundation provided on the ground and the structure for the purpose of reducing horizontal vibration of the structure due to an earthquake. Is.

[Conventional technology]

Conventionally, this type of device is designed to have a reducing effect by deformation of laminated rubber, but deterioration over time of the material is unavoidable, and a fail-safe mechanism, a damper mechanism, etc. against breakage under repeated stress. Auxiliary devices are needed.

[Problems to be solved by the device]

An object of the present invention is to provide a seismic isolation device that eliminates the above-mentioned conventional drawbacks, does not deteriorate with age, requires no auxiliary device, and does not break even when subjected to repeated stress.

[Means for Solving the Problems]

 The means of the present invention are as follows.

It consists of an upper plate and a lower plate made of hard materials such as steel and ceramics, and a number of spheres that are interposed between the two plates.A spherical convex surface is formed on the lower surface of the upper plate, and a spherical concave surface is formed on the upper surface of the lower plate. The seismic isolation device is characterized in that the sphere is sandwiched between the spherical concave surface of the lower plate and the spherical convex surface of the upper plate, and the lower plate is installed on the ground, and the structure supports the upper plate.

〔Example〕

Fig. 1 shows the principle of rolling of the building 2 when earthquake motion acts on the ground 1 and the building 2. In the figure, 3 shows the rolling state of the ground surface, and 4 shows the building 2 It shows shaking.

In general buildings, the upper part of the building shakes violently and is deformed.

FIG. 2 schematically shows the installation location of the device of the present invention and expected effects.

In the figure, 5 is a foundation provided on the ground 1, 6 is the device of the present invention,
When the building 2 is subjected to an earthquake motion, the shaking of the building 2 is small as indicated by reference numeral 4.

3 and 4 show an embodiment of the present invention, in which 7 is a lower plate, 8 is a sphere, and 9 is an upper plate. The lower board 7 has a mortar-shaped spherical concave surface 11 on the upper surface and a flat surface portion 10 at the center, a stopper surface 13 is provided on the periphery, a lower surface of the upper board 9 has a spherical convex surface 12, and the sphere 8 is a lower board 7. It is sandwiched between the spherical concave surface 11 and the flat surface portion 10 and the spherical convex surface 12 of the upper plate 9.

[Action]

When the foundation 5 horizontally vibrates due to the earthquake motion, the upper plate 9 moves horizontally on the spheres 8 and 8. Therefore, the resistance between the spherical concave surface 11 of the lower plate and the sphere 8 decreases as the spheres 8 rotate.

Further, when the upper plate is moved, it is received by the stopper surface 13 to prevent the stopper plate 13 from falling off and prevent a large lateral movement. Furthermore, since the upper board rises slightly due to lateral movement, horizontal movement due to horizontal vibration caused by an earthquake or the like changes into a force that pushes the building itself upward. Therefore, the horizontal movement is a force that naturally returns to the original due to the gravity of the earth, which acts on the weight of the building.

[Effect of device]

According to the present invention, the force that pushes up the building itself is exerted by the horizontal movement caused by the earthquake motion, and the gravity of the earth, which acts on the weight of the building, naturally returns it to its original state. Therefore, horizontal vibration is not directly transmitted to the building. Prevents extensive rolling and minimizes damage to buildings due to earthquakes.

[Brief description of drawings]

Fig. 1 is a diagram showing the state of rolling of a building due to an earthquake.
The figure is a schematic explanatory view showing the installation location of the device of the present invention, the third
The figure is a vertical sectional front view of the seismic isolation device, FIG. 4 is a perspective view of a lower panel, and FIG. 5 is a perspective view of an upper panel. 1 ... Earthquake, 2 ... Building 7 ... Lower plate, 8 ... Sphere 9 ... Upper plate, 10 ... Flat part 11 ... Spherical concave surface, 12 ... Spherical convex surface 13 ... Stopper surface

Claims (1)

[Scope of utility model registration request] 1. A seismic isolation device comprising a combination of the following three items (a), (b) and (c). (A) Being composed of an upper and lower plate made of a hard material such as steel or ceramic, and a large number of spheres interposed between both plates, (b) Forming a spherical convex surface on the lower surface of the upper plate Then, provide a spherical concave surface on the upper surface of the lower plate, (c) the sphere is sandwiched between the spherical concave surface of the lower plate and the spherical convex surface of the upper plate, the lower plate is placed on the ground, and the structure is constructed by the upper plate. To support.