JP2833121B2 - Three-dimensional seismic isolation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a three-dimensional seismic isolation device.

[Related Art] In recent years, in a control room or a computer room where a complicated and super-precise device or a computer which dislikes vibration is installed, a seismic isolation floor system for protecting such devices from vibration such as an earthquake has been put to practical use. .

FIG. 5 shows an example of a three-dimensional seismic isolation device used in the above-mentioned seismic isolation floor system.
On the base plate 3 fixed to the required position of the building floor 2,
A sliding plate 4 slidable in the horizontal direction with a required frictional resistance is placed, and a lower end of an air spring 5, which is a resilient member capable of being elastically displaced in the vertical direction, is fixed to the upper portion of the sliding plate 4. In addition, the upper end of the air spring 5 is fixed to the lower surface of the seismic isolation floor 6 to support the seismic isolation floor 6.

In the figure, reference numeral 7 denotes a displacement control coil spring disposed around the sliding plate 4 so that the sliding plate 4 does not slide more than the width of the base plate 3.

Therefore, when an earthquake occurs and seismic force acts on the building, the seismic force in the vertical direction is isolated by the vertical elastic displacement of the air spring 5, and the seismic force in the horizontal direction is reduced by the base plate 3.
When the sliding plate 4 slides relatively in the horizontal direction and escapes, the base is isolated.

[Problems to be Solved by the Invention] However, in the three-dimensional seismic isolation device 1 as described above, there is a disadvantage that the air spring 5 is easily buckled because the horizontal deformation performance of the air spring 5 is small.

Therefore, as shown in FIG. 6, between the base-isolated floor 6 and the sliding plate 4, a piston-type horizontal shaft is used which restrains both members in the horizontal direction and expands and contracts with respect to the relative displacement in the vertical direction. It was considered that the buckling of the air spring 5 was prevented by installing the restraining guide 8.

However, in many cases, the parallelism between the seismic isolation floor 6 and the sliding plate 4 is often not maintained due to the mounting load conditions of the seismic isolation floor 6 and the manufacturing accuracy. If the horizontal restraining guide 8 is merely installed, the sliding portion of the horizontal restraining guide 8 may be galled, and
As shown by the two-dot chain line in the figure, the relative displacement in the vertical direction is restricted, and there is a possibility that the seismic isolation performance against the vertical seismic force is significantly impaired.

The present invention has been made in view of the above circumstances, and restrains the vertical relative displacement between the base-isolated floor and the sliding plate even when the parallelism between the base-isolated floor and the sliding plate is not maintained. It is an object of the present invention to provide a three-dimensional seismic isolation device having a horizontal restraint guide that allows a seismic isolation floor and a sliding plate in the horizontal direction without being tolerated.

Means for Solving the Problems According to the present invention, a sliding plate slidable in the horizontal direction is placed on a base plate fixed to the floor of a building, and the lower end thereof is fixed on the sliding plate and the upper end thereof is isolated. In a three-dimensional seismic isolation device configured to support the seismic isolation floor with a resilient member vertically elastically displaceable fixed to the floor, a horizontal relative position between the seismic isolation floor and a sliding plate is provided. A horizontal high-speed guide having a vertical sliding bearing for restraining displacement and a spherical bearing for permitting a deviation of the parallelism between the two is provided.

[Operation] Therefore, in the present invention, even if an earthquake occurs in a state where the parallelism between the base-isolated floor and the sliding plate is not maintained,
The deviation of the parallelism between the base-isolated floor and the sliding plate is allowed by the spherical bearing, and the vertical relative displacement is allowed without hindrance by the vertical sliding bearing. The displacement is absorbed by the resilient member, and the seismic force in the vertical direction is seismically isolated, and the seismic force in the horizontal direction is reduced by sliding the sliding plate on the base plate to escape. At this time, the sliding plate is restrained by the horizontal restraint guide so as to move horizontally with the seismic isolation floor, so that a relative displacement in the horizontal direction occurs between the seismic isolation floor and the sliding plate, and The situation in which the repellent member buckles is reliably avoided.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention.
Parts denoted by the same reference numerals as those in the drawings represent the same items.

In the three-dimensional seismic isolation device 9 configured substantially in the same manner as the three-dimensional seismic isolation device 1 of FIG. 5 described above, the lower surface of the seismic isolation floor 6 near the air spring 5 which is a resilient member that can be elastically displaced in the vertical direction. ,
A guide rod 10 extending a required length in a direction perpendicular to the lower surface.
The guide tube 11 is erected on the upper surface of the sliding plate 4 facing the guide rod 10, and the lower part of the guide rod 10 is connected via a spherical slide bearing mechanism 12 formed inside the guide tube 11. Guide tube 11
To form a horizontal constraint guide 13a.

Here, the spherical plain bearing mechanism 12 includes the guide cylinder
11 a spherical seat 14 attached to the upper inner peripheral surface, and a rolling sphere 16 having a through hole 15 slidably held by the spherical seat 14 and slidably fitting the lower part of the guide rod 10. The seismic isolation floor 6 and the sliding plate 4 are formed by the through holes 15 of the rolling spheres 16 and the guide rods 10.
Sliding bearing 17 that restrains the horizontal relative displacement of the bearing
The rolling sphere 16 and the spherical seat 14 constitute a spherical bearing portion 18a which allows deviation of the parallelism between the seismic isolation floor 6 and the sliding plate 4.

Therefore, as shown in FIG. 2, even if an earthquake occurs when the parallelism between the base-isolated floor 6 and the sliding plate 4 is not maintained, the rolling spheres 16 held on the spherical seat 14 are not affected. Since it can roll freely and allow the guide rod 10 to slide in the axial direction, the vertical relative displacement between the base-isolated floor 6 and the sliding plate 4 is not restricted, and the elasticity of the air spring 5 is not restricted. Absorbed by the displacement, the vertical seismic force is isolated.

The seismic force in the horizontal direction is seismically isolated by sliding the sliding plate 4 relatively horizontally on the base plate 3 to escape. At this time, the sliding plate 4 is isolated by the horizontal restraining guide 13a. Since it is constrained to move horizontally with the floor 6, the relative displacement in the horizontal direction does not occur between the seismic isolation floor 6 and the sliding plate 4, and the air spring 5 does not buckle.

Therefore, according to the above, even if an earthquake occurs when the parallelism between the base-isolated floor 6 and the sliding plate 4 is not maintained, the relative displacement of the base-isolated floor 6 and the sliding plate 4 in the vertical direction is restricted. Since the seismic isolation floor 6 and the sliding plate 4 can be restrained in the horizontal direction, the buckling of the air spring 5 can be reliably prevented, and extremely good seismic isolation performance can be achieved. Obtainable.

FIG. 3 shows another embodiment of the three-dimensional seismic isolation device of the present invention. The three-dimensional seismic isolation device is provided with a guide tube 19 erected on the upper surface of the sliding plate 4 and mounted on the inner peripheral surface of the guide tube 19 so as to be vertically movable. The spherical bearing 20 constitutes a vertical sliding bearing portion 17b,
Further, a spherical bearing portion 18 is formed by the spherical seat 20 and a spherical portion 22 formed at the lower end of a guide rod 21 having an upper end fixed to the lower surface of the seismic isolation floor 6 and rotatably held by the spherical seat 20.
This is an example in which a horizontal restraining guide 13b constituting b is provided.

FIG. 4 shows still another embodiment of the three-dimensional seismic isolation device of the present invention.
The upper and lower sliding bearings 17c are formed by a spherical part 24 formed at the lower end and an upper part of a guide rod 26 which is rotatably held by a spherical seat 25 mounted on the upper surface of the sliding plate 4.
Further, in this example, a horizontal restraining guide 13c in which a spherical bearing portion 18c is formed by the spherical portion 24 and the spherical seat 25 is provided.

Note that the horizontal restraining guide 13 in all the above-described embodiments is used.
a, 13b, 13c may be mounted upside down on the seismic isolation floor 6 and the sliding plate 4, and the horizontal restraining guides 13a, 13b, 13c may be installed near the air spring 5. Alternatively, it may be inside the air spring 5.

It should be noted that the three-dimensional seismic isolation device of the present invention is not limited to the above-described embodiment, and the resilient member which can be elastically displaced in the vertical direction is not limited to an air spring, but employs a coil spring or the like. Of course, various changes may be made without departing from the spirit of the present invention.

[Effects of the Invention] As described above, according to the three-dimensional seismic isolation device of the present invention, even if an earthquake occurs when the parallelism between the seismic isolation floor and the sliding plate is not maintained, the seismic isolation can be achieved. The relative displacement of the floor and the sliding plate in the vertical direction is allowed without restraint, and the seismic isolation floor and the sliding plate can be restrained in the horizontal direction, so that buckling of the resilient member is reliably prevented. And an excellent effect of obtaining extremely good seismic isolation performance can be obtained.

[Brief description of the drawings]

1 is a cross-sectional view of one embodiment of the present invention, FIG. 2 is an explanatory view of the operation of FIG. 1, FIG. 3 is a cross-sectional view showing another embodiment of the present invention, and FIG. FIG. 5 is a cross-sectional view showing another embodiment, FIG. 5 is a front view showing an example of a three-dimensional seismic isolation device used for a seismic isolation floor system, and FIG. 6 is a cross-sectional view showing a conventional example. In the figure, 2 is a building floor, 3 is a base plate, 4 is a sliding plate, 5 is an air spring (elastic member), 6 is a seismic isolation floor, 9 is a three-dimensional seismic isolation device, 13a, 13b, and 13c are horizontal constraint guides, Reference numerals 17a, 17b, 17c denote vertical sliding bearings, and reference numerals 18a, 18b, 18c denote spherical bearings.

Claims (1)

(57) [Claims] 1. A horizontally slidable sliding plate is mounted on a base plate fixed to a building floor,
A three-dimensional seismic isolation device having a lower end fixed to the sliding plate and an upper end fixed to the seismic isolation floor, wherein the seismic isolation floor is supported by a resilient member which can be vertically elastically displaced. Between the shaking floor and the sliding plate, a horizontal restraining guide having a vertical sliding bearing portion for restraining the relative displacement of the two in the horizontal direction and a spherical bearing portion for allowing a deviation of the parallelism between the two is provided. Features a three-dimensional seismic isolation device.