JPH1122022A - Base isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolating device which can endure the weight of a structure, has a strong dragging force, keeps a base-isolated object horizontal under earthquake motion, and can hold the natural frequency of the base-isolated object constant even if the weight of the base-isolated object is greatly varied. SOLUTION: This base isolating device includes an X-rail 1 secured to a lower surface plate 2 and having on its side face a groove 6 for a ball bearing and having a fixed inclination such that its is lower at its center than at both ends; a Y-rail 3 secured to an upper surface plate 4 above the X-rail 1 and having the groove 6 for a ball bearing on its side face perpendicular to the X-rail 1, and having a fixed inclination such that it is higher at its center than at both ends; and a connecting block divided into upper and lower parts 8, 9 which sandwich the X-rail 1 and the Y-rail 3, respectively, with a ball bearing 1 and/or a roller placed between the upper and lower parts 8, 9 and the X- and Y-rails 1, 3, the upper and lower parts being coupled together in such a way that they can be held horizontal under earthquake motion. The center portions of the X-rail 1 and the Y-rail 3 having the fixed inclinations form curved faces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device for protecting a structure from an earthquake.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a pull-out preventing device 22 is fixed to a foundation 21 and a part of a structural dye 24 penetrates an opening 23 thereof (Japanese Patent Publication No. 4-65193).
No.). Such a device is not suitable as the strong pull-out connecting block of the present invention.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and provides a seismic isolation device having a connecting block capable of withstanding the weight of a structure and having a strong pull-out force and leveling ability. It is.

[0004]

In order to solve the above-mentioned problems, the present invention is directed to an X-axis bearing having a fixed inclination fixed to a lower plate and having a groove for a ball bearing on a side surface and having a low center and high both ends.
A rail, a Y-rail fixed to an upper plate above the X-rail and having a groove for a side ball bearing in a direction perpendicular to the X-rail and having a constant center and a high inclination at both ends, divided into an upper part and a lower part The lower part is provided with a ball bearing which fits in the groove on the inner side surface of the X rail and the bail bearing or roller is provided on the top surface. The upper part is provided with the Y rail and the inner side surface thereof. A ball bearing that fits into the groove of the Y-rail, a ball bearing or a roller is provided on the bottom surface, and a connection block is provided in which the upper and lower parts are maintained horizontally during vibration. A seismic isolation device characterized by the following. X,
In some cases, the center of the surface inclined at a constant angle toward both ends of the Y rail may be a curved surface. The connection block has an upper portion and a lower portion connected by an elastic body such as a spring or rubber, or an upper portion having a spherical concave surface and a lower portion having a spherical convex surface. When the ball bearings arranged on the side surfaces of the X rail and the Y rail are arranged in two or more rows, the force withstanding the pulling force becomes stronger.

The present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a side view showing a relative position where a connecting block 5 is engaged with an X rail 1 having a constant inclination in a normal state. The seismic isolation moves along the X rail.

In the drawing, reference numeral 2 denotes a lower plate on which the X rail 1 is mounted;
Is an upper surface plate on which the Y rail 3 is mounted. 5 is a connection block, and 6 is a ball bearing groove of the X rail 1. Although these grooves are shown in one row, it is more preferable to have two or more rows.

FIG. 2 is a side view showing a relative position where the connecting block 5 is engaged with the Y rail 3 having a constant inclination in a normal state.
The constant inclination of the Y rail 3 is the same as that of the X rail 1,
The seismic isolation object moves along the Y rail 3. In the figure, reference numeral 7 denotes a ball bearing groove of the Y rail 3.

FIG. 3 is a side view showing a relative position where the connecting block 5 is engaged with the X rail 1 whose center is a curved surface (R) and whose both ends are inclined at a constant angle in normal times. FIG. 4 is a side view showing a relative position where the connecting block 5 is engaged with the Y-rail 3 whose center is a curved surface (R) and whose both ends are inclined at a constant angle in normal times. In FIGS. 3 and 4, the center of the rail is curved, so that the seismic isolation object moves more smoothly on the X and Y rails in the center than in FIGS.

FIGS. 5 to 7 show an embodiment of the connecting portion 5.
FIG. 5 shows a state in which a spring 10 is interposed between the upper part 8 and the lower part 9, FIG. 6 shows a state in which a rubber (elastic body) 11 is also interposed, and FIG. Corresponding concave surfaces 13 are provided, and these are opposed to each other with a clearance provided at the periphery. Therefore, in any case, even if the seismic isolated object moves along the fixed inclined surface of the X and Y rails or further along the curved surface at the center and tilts, the spring, rubber and spherical surface in the middle of the connecting portion are inclined. Adjust to maintain level. One or more rows of ball bearings are arranged between the side surface of the X rail 1 and the Y rail 3 and the inside of the connecting part, so that it has a strong pulling force and is unique even if the weight of the seismic isolation material changes significantly. This is a seismic isolation device that can keep the cycle constant.

[0010]

Embodiments of the present invention will be further described below with reference to the drawings.

FIG. 1 shows an X rail 1 fixed to a lower plate 2 and having a ball bearing groove 6 on its side surface and having a constant inclination, which is sandwiched by a lower portion 9 of a connecting block 5 and a Y rail 3 fixed to an upper plate 4 The connecting block 5 is sandwiched by the upper part 8 and the upper part 8 and the lower part 9 are connected by means described later. FIG. 2 is a side view of the Y-rail 3 having a constant inclination. The Y-rail 3 is fixed to the upper plate 4 and a ball bearing groove 7 is formed on a side surface. FIG. 3 shows the X rail 1 in FIG.
4 has a curved surface (R) at the center thereof, and FIG. 4 has a curved surface (R) at the center of the Y rail in FIG.

When the angle of the constant inclination between the X rail 1 and the Y rail 3 is less than 0.5 degrees, the restoring force of the seismic isolation device becomes weak. Since the seismic isolation effect cannot be obtained, the range of 0.5 to 5 degrees is good. The preferred angle is one degree.

FIGS. 5, 6, and 7 show various aspects of the connecting block 5. The connecting block 5 has a lower portion 9 connected to sandwich the X rail 1 and a Y rail 3 connected to the upper portion 8. Is shown. On the Y rail 3 side, a state is shown in which the ball bearing 14 is connected to the upper portion 8 of the connection block 5 via a ball bearing or a roller 15. The connection between the X rail 1 and the lower part 9 of the connection block 5 is also
The engagement between the Y rail 3 and the upper portion 8 of the connection block 5 is symmetrical in the direction perpendicular to the right angle. Ball bearing 14
In the example shown in the figure, although a single row has a strong pulling force, a stronger pulling force can be obtained by providing a plurality of rows of ball bearings 14. The ball bearing or roller 15 contributes to the relative movement between the connecting block 5 and the X rail 1 and the Y rail 3. A spring 10 in FIG. 5 and a rubber (elastic body) 11 in FIG. 6 are interposed between the upper part 8 and the lower part 9 of the connecting block 5, and a central part of the lower part 9 is a spherical surface 12 in FIG.
A corresponding portion of the upper portion 8 is formed as a concave surface 13, and the two are opposed to each other by a bolt 17 and a nut 18 with a clearance 16 on the periphery. 5 and 6, 19 is an upper flange,
Reference numeral 20 denotes a lower flange, which is connected to each other by bolts 17 and nuts 18. In any of the cases of FIGS. 5 to 7, even if the seismic isolation object moves along a constant inclined surface of the X rail or the Y rail or a curved surface in the center during the vibration, the inclination is the elasticity or the spherical surface of the spring or rubber. Is corrected by the inclination of the object, and the seismic isolated object can be moved horizontally.

[0014]

According to the seismic isolation device of the present invention, an elastic body such as a spring, rubber or the like and a spherical surface are arranged on a connecting block which engages with the X rail or the Y rail to keep the seismic isolated object horizontal even during a vibration. A single row or a plurality of rows of ball bearings are arranged on the side surface of the, so that a strong pulling force can be obtained. Also, the restoring force becomes smooth.

[Brief description of the drawings]

FIG. 1 is a side view of the seismic isolation device of the present invention in which an X rail is engaged with a connection block and a Y rail is engaged with the connection block.

FIG. 2 is a side view of the seismic isolation device of the present invention in which a Y rail is engaged with a connection block and an X rail is engaged with the connection block.

FIG. 3 is a side view on the X-rail side according to another example of the present invention.

FIG. 4 is a side view of the Y rail in FIG. 3;

FIG. 5 is a side view of the connecting block of the seismic isolation device of the present invention, in which a spring is arranged in the middle.

FIG. 6 is a side view of the connecting block of the seismic isolation device of the present invention in which rubber (elastic body) is arranged in the middle.

FIG. 7 is a cross-sectional view of the seismic isolation device of the present invention in which the connection block is spherically joined at the upper part and the lower part.

FIG. 8 is a perspective view of a conventional pull-out preventing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X rail 2 Lower plate 3 Y rail 4 Upper plate 5 Connecting block 6,7 Ball bearing groove 8 Upper part 9 Lower part 10 Spring 11 Rubber (elastic body) 12 Spherical surface 13 Concave surface 14 Ball bearing 15 Bale bearing or roller 16 Clearance 17 Bolt 18 Nut 19 flange

Claims (5)

[Claims] 1. An X-rail fixed to a lower surface plate and having a groove for a ball bearing on a side surface and having a fixed center and a lower end, and fixed to an upper surface plate above the X-rail and orthogonal to the X-rail. A Y-rail having a groove for a side ball bearing in the direction in which the center is high and both ends are low, and is divided into an upper part and a lower part. A ball bearing or roller is arranged on the top surface, a ball bearing is arranged on the inner side surface, and a ball bearing is arranged on the inner side surface. A seismic isolation device comprising: a connecting block having an upper part and a lower part connected so as to be able to maintain a horizontal state during a vibration. 2. An X-rail fixed to a lower surface plate and having a groove for a ball bearing on a side surface and having a curved surface at a center and a constant inclination at both ends, and an X-rail fixed to the upper surface plate above the X-rail. On the other hand, Y has a groove for a side ball bearing in the direction orthogonal to the center, and has a curved surface at the center and a high inclination at both ends.
The rail is divided into an upper part and a lower part. The lower part sandwiches the X rail, and a ball bearing which fits into the groove of the X rail is disposed on the inner side surface thereof. The upper part sandwiches the Y-rail, the ball bearing is arranged on the inner side, the ball bearing or the roller is arranged on the bottom, and the upper part and the lower part are connected so that they can be kept horizontal during vibration. A seismic isolation device characterized by comprising a block. 3. The seismic isolation device according to claim 1, wherein the connecting block connects the upper part and the lower part with a spring or a rubber elastic body. 4. The seismic isolation device according to claim 1, wherein the connecting blocks are connected to each other with a spherical concave surface at an upper portion and a spherical convex surface at a lower portion. 5. The seismic isolation device according to claim 1, wherein two or more rows of ball bearings on the inner surface of the X rail and the Y rail are arranged.