Seismic isolation device

Abstract

While adhering to the concept of rolling bearings, this seismic isolation device possesses both the damping function and the restorative function of a bearing, which were problems with rolling bearings, and also solves the problem of wind resistance, providing a highly effective seismic isolation device. [Solution] The seismic isolation device provides a seismic isolation system that uses a base with a circular plane at the center of the base, a spherical surface around the periphery, and a cone-shaped upper section, or a seismic isolation system with the same function but with a circular plane at the center of the base and a spherical surface around the periphery, where the building's load is applied at the vertex on a vertical line from the center. In response to the horizontal shaking of an earthquake, the spherical base section moves in accordance with the shaking, but the movement at the vertex of the upper seismic isolation system is minimized, although there is an angle change. Furthermore, this seismic isolation device incorporates a coil spring for damping and a magnet for fixing, and has the function of damping shaking more effectively than conventional rolling bearings, as well as a restorative function as a bearing.

Description

[[Technical Field]]

[0001] The present invention relates to an earthquake seismic isolation device. [[Background Art]]

[0002] Conventional seismic isolation devices include laminated rubber bearings, rolling bearings, sliding friction bearings, oil dampers, steel dampers, lead dampers, friction dampers, and the like. [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0003] Among the conventional seismic isolation devices described above, laminated rubber bearings require replacement once every several decades due to aging degradation caused by hydrolysis of rubber. Steel dampers and lead dampers do not have a bearing function. The same applies to oil dampers and friction dampers. Except for some cases, sliding friction bearings have problems in the restoring function and damping function. Rolling bearings are excellent in the function of not propagating earthquake shaking, but have problems that they do not have a function of damping earthquake shaking, do not have a restoring function as a bearing, and shake under wind.

[0004] The present invention aims to solve the problems that such conventional seismic isolation devices have, and an object of the present invention is to realize a seismic isolation device with a great seismic isolation effect, which, while following the concept of rolling bearings, has both the damping function and the restoring function as a bearing that were problems of rolling bearings, solves the problem related to wind. [[Means for Solving the Problem]]

[0005] To achieve the above objective, the present invention provides a seismic isolation system in which a base with a circular central shape, a spherical periphery, and a conical upper section is placed on an outer shell case with a steel plate attached to a frame. Alternatively, a similar seismic isolation system with a circular central shape and a spherical periphery is placed on a vertical line from the center of the base, with the load applied along the vertical line from the center. Both types of seismic isolation systems have essentially the same function and structure, differing only in shape. The upper apex of this seismic isolation system is finished with a spherical surface and is connected to the building via a receiver, bearing the load of the building as a support. Multiple such systems are installed beneath the building. The size of the seismic isolation system can accommodate various earthquake amplitudes.

[0006] Furthermore, the second solution involves connecting a coil spring coaxially to the upper part of the seismic isolation body, and fixing the top portion of the coil spring to the top portion of the outer shell case.

[0007] Furthermore, a third solution to the problem involves embedding a magnet inside the central part of the base of the seismic isolation structure.

[0008] The effects of the first problem-solving method described above are as follows: When the ground shakes horizontally along with the case of this seismic isolation device, the bottom of the isolation body moves with the shaking, and when it exceeds the limit of the central circular plane, the surrounding spherical part also moves in sync. However, even though there is a large movement at the bottom of the isolation body, the movement at the top of the isolation body, which is finished as a spherical surface, is minimized compared to the spherical part at the bottom. It is through this principle that earthquake shaking is minimized, that is, seismic isolation is achieved.

[0009] Furthermore, the second problem-solving mechanism involves the coil spring acting as a damping damper, providing vibration damping, stabilization, and restoration functions for the seismic isolation device, as well as preventing swaying due to wind.

[0010] Furthermore, the third problem-solving method works by using magnets to attach the seismic isolation body to the lower steel plate of the outer shell case, providing stabilization and restoration functions during normal operation, as well as preventing swaying in wind. [Effects of the Invention]

[0011] As described above, the seismic isolation device of the present invention is effective in minimizing earthquake shaking, solves the problem of swaying due to wind that plagued rolling bearings, and also has a restorative function, providing a seismic isolation device with excellent stability. [Brief explanation of the drawing]

[0012] [Figure 1] Partial cross-sectional view of a seismic isolation device illustrating an embodiment of the present invention. [Figure 2] The same diagram shows the installation of a coil spring for braking. [Modes for carrying out the invention]

[0013] Hereinafter, embodiments of the present invention will be described with reference to Figure 1.

[0014] In the diagram, 1 is a seismic isolation body designed to minimize earthquake shaking, 2 is the upper apex of the seismic isolation body which is finished with a spherical surface, 3 is the spherical bottom of the seismic isolation body, 4 is a magnet embedded in the bottom of the seismic isolation body, 5 is the outer shell case, 6 is a support that receives the load of the building and is also processed with a spherical surface at the bottom, 7 is a coil spring, and 8 is a steel plate at the bottom of the outer shell case.

[0015] The operation of the above configuration will be explained below. The seismic isolation bodies 1, which are installed in multiples on the foundation plane or columns of the building, are normally upright and facing upwards. In order to maintain stability and prevent the building from moving due to crosswinds, the center of these seismic isolation bodies is circular in shape, and a magnet 4 is built inside which is attracted to the iron plate 8 at the bottom of the outer shell.

[0016] The upper part of the seismic isolation body is either a cone-shaped seismic isolation body with a spherical apex, or a seismic isolation body with a circular planar base and a spherical periphery, with a spherical apex on a vertical line. It is connected to the building via a support 6 with a spherical bottom and supports the load of the building.

[0017] In a more advanced version, a coil spring 7 is attached to the upper conical section of the seismic isolation body or to the upper part of a line extending vertically upward from the circular plane at the center of the base, and is fixed to the ceiling of the outer shell case (Figure 2).

[0018] This coil spring 7 is effective for maintaining normal stability, obtaining the damping effect on earthquake vibration and the restoring force as a bearing of the seismic isolation device.

[0019] In the event that horizontal earthquake vibration occurs, if the holding limit of the bottom center of the seismic isolation body 1 is exceeded, the spherical bottom portion 3 of the seismic isolation body moves following the earthquake vibration.

[0020] The upper apex 2 of the seismic isolation body also moves, but due to the angular change, its movement is extremely minimized compared to the movement range of the spherical bottom portion 3. This is the seismic isolation principle of the present seismic isolation device.

[0021] When the seismic isolation body moves, the coil spring 7 shown in Figure 2 acts as a force for damping the vibration.

Description of Reference Numerals

[0022] 1 Seismic isolation body for minimizing earthquake vibration 2 Spherically machined upper apex of the seismic isolation body 3 Spherical bottom portion of the seismic isolation body 4 Magnet 5 Outer shell case 6 Receiver with a spherically machined lower portion 7 Coil spring 8 Iron plate at the lower part of the outer shell case

Claims

[Claim 1] The seismic isolation body has a circular base in the center, a spherical periphery, and a cone-shaped upper section. A seismic isolation device that performs seismic isolation by the principle that the spherical base follows the horizontal shaking of an earthquake, but the movement at the apex of the upper cone is minimized compared to the movement of the spherical base, or a seismic isolation body with a circular plane at the center of the base, a sphere around it, and a cone shape at the top, which functions the same as a seismic isolation device that performs seismic isolation by the principle that the spherical base follows the horizontal shaking of an earthquake, but the movement at the apex of the upper cone is minimized compared to the movement of the spherical base, or a seismic isolation device with a circular plane at the center of the base and a sphere around it, which receives the load of the building at the apex on a vertical line from the center, with a magnet embedded in the circular plane at the bottom of the seismic isolation body.

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