JPH063072B2 - Seismic isolation device for buildings - Google Patents

Description

The present invention relates to a seismic isolation device for a building.

(Prior Art) Conventional seismic isolation structures generally focus on large earthquakes, and are therefore designed with a long period by interposing laminated rubber so that the earthquake input is small.

(Problems to be solved by the invention) Accordingly, the conventional seismic-isolated structure has a larger sway than a non-seismic-isolated structure when a relatively large amount of strong winds or small earthquakes occur. There is a problem that it is not good.

(Means for Solving Problems) The present invention has been proposed to solve such problems, and has a plurality of vertical deformation characteristics different from each other interposed between a building and a foundation. Laminated rubber, a superconducting electromagnet that is disposed on the opposing surfaces of the building and the foundation and that generates magnetic repulsion, an earthquake magnitude is detected, and the current applied to the superconducting electromagnet is adjusted to adjust the plurality of laminated layers. The present invention relates to a seismic isolation device for a building, which comprises a control device for separating a required number of laminated rubbers from the rubber from the building.

(Operation) Since the present invention is configured as described above, when the earthquake occurs, the control device detects the magnitude of the earthquake, and the detection signal is provided on the opposing surfaces of the building and the foundation. By adjusting the current applied to the superconducting electromagnets and adjusting the magnetic repulsion force of both magnets, the axial force acting on the seismic isolation device is adjusted, and the vertical direction is arranged between the building part and the foundation. Of the laminated rubbers having different deformation characteristics, some of the laminated rubbers are separated from the structure, and the number of supporting the building among the laminated rubbers having different vertical characteristics between the building and the foundation. Is controlled to change the horizontal rigidity of the seismic isolation device.

Thus, when a relatively large amount of wind or a small earthquake occurs, all of the plurality of laminated rubbers are resisted to maintain a large horizontal rigidity and reduce a horizontal deformation.

Further, in the event of a large earthquake, a part of the weight of the building is borne by the magnetic repulsive force generated by applying a current to the superconducting electromagnet, and some of the plurality of laminated rubbers are separated from the building to eliminate resistance. This reduces the horizontal rigidity of the seismic isolation device to exert the seismic isolation effect and reduces the seismic input to the building.

(Examples) The present invention will be described below with reference to illustrated examples.

(1) is a building, (2) is a foundation, and a plurality of laminated rubbers (3A) (3A) (3A) with different vertical deformation characteristics are used between them in a general seismic isolation structure. 3B) and (3C) are provided as a set, and strong superconducting electromagnets (4) and (4 ′) are arranged on the surfaces facing the building (1) and the foundation (2).

A displacement meter (not shown) that is installed inside or outside the building (1) and detects the magnitude of an earthquake, and receives the inspection signal of the displacement meter and applies it to the electromagnets (4) (4 ') A controller (5) consisting of a device for adjusting the current is provided.

When an earthquake occurs, the magnitude of the earthquake is detected by the control device (5), and the electromagnet (4) is detected in response to this detection signal.
By adjusting the current applied to (4 ′) and adjusting the magnetic repulsion force generated by the electromagnets (4) and (4 ′), some of the plurality of laminated rubbers (3b) (3c) Is separated from the building to control the axial force acting on the seismic isolation device and change the horizontal rigidity of the seismic isolation device.

In the case of relatively strong winds and small earthquakes, the electromagnet
(4) Without activating (4 ') at all, all laminated rubber (3a) (3b), (3c) are horizontally resisted to maintain the rigidity of the seismic isolation device and reduce horizontal deformation to make it more comfortable. To improve.
(Refer to FIG. 2) When a large earthquake occurs, the control unit 5 detects it and sends a current to the electromagnets (4) and (4 ′), and the two electromagnets
Structure (1) due to magnetic repulsion generated between (4) and (4 ′)
Part of the weight of the same building (1) is borne by levitating, and one laminated rubber among the plurality of laminated rubbers (3)
Effectively using only (3A), the remaining two laminated rubber (3b) (3c)
Is separated from the structure (1) because the structure (1) is levitated and the horizontal resistance of the structure (1) is reduced, thus reducing the horizontal rigidity of the seismic isolation device. The seismic isolation characteristics equivalent to those of the building are exhibited, and the seismic input to the building (1) is reduced. (See Fig. 3) Fig. 4 shows the relationship between the axial force (vertical force) acting on the seismic isolation device and the horizontal rigidity of the device. (A) shows the case where three laminated rubbers 3 function effectively. , (B) show two laminated rubbers 3 and (c) one laminated rubber (3).

FIG. 5 shows the relationship between the horizontal displacement of a building and the shearing force in the conventional seismic isolation structure and the seismic isolation device according to the present invention when one to three laminated rubbers are interposed and functioning. In the case, a is A, and in the case of a medium earthquake, b is B, and the horizontal deformation amount decreases.

(Effect of the Invention) As described above, in the seismic isolation device for a building according to the present invention, a plurality of laminated rubbers having different vertical deformation characteristics are respectively interposed between the building and the foundation, and the two are opposed to each other. By disposing a superconducting electromagnet on the surface, adjusting the current applied to the superconducting electromagnet depending on the magnitude of the earthquake, and by providing a control device for separating the required number of laminated rubbers of the plurality of laminated rubbers from the building, Adjusting the axial force acting on the seismic isolation device and controlling the number of the laminated rubbers that horizontally resist to change the horizontal rigidity of the seismic isolation device, and the horizontal rigidity of the seismic isolation device when a relatively large amount of strong wind or small earthquake occurs. , Which reduces the shaking of the building to improve the habitability and shows the same seismic isolation effect as the structure of the conventional building during a large earthquake, and reduces the seismic input to the building. Is.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a seismic isolation device for a building according to the present invention, and FIGS. 2 and 3 are detailed views of a portion X of FIG. 1, respectively, for a small deformation and a large deformation. Indicates the state of time. FIG. 4 is a diagram showing the relationship between the axial force and horizontal rigidity of the seismic isolation device of the present invention, and FIG. 5 is a diagram showing the relationship of horizontal displacement and shear force of the seismic isolation device of the present invention. (1)… Building, (2)… Foundation (3) (3A) (3B) (3C)… Laminated rubber (4) (4 ′)… Superconducting electromagnet, (5)… Control device

Claims (1)

[Claims] 1. A plurality of laminated rubbers, which are interposed between a building and a foundation and have different vertical deformation characteristics, and a superconducting material which is disposed on the facing surfaces of the building and the foundation and produces magnetic repulsion. It is comprised of an electromagnet and a control device that detects the magnitude of an earthquake and adjusts the current applied to the superconducting electromagnet to separate a required number of laminated rubbers from the plurality of laminated rubbers from a building. Seismic isolation device for buildings.