JP2020183773A - Seismic isolator - Google Patents

Abstract

To provide a seismic isolator for suppressing an inclination of an upper plate caused by the loading of a seismic isolation object even if the upper plate of the seismic isolator is moved up to a finish position at an occurrence of an earthquake.SOLUTION: In a seismic isolator 100 which comprises first and second plates 10, 50 having a plurality of grooves, and a plurality of rolling bodies fit into the respective plates 10, 50, and in which the first plate 10 is laminated on the second plate 50 via the rolling bodies, a first guide member 20 having a first protrusion 22 oriented to the first plate 10 side is formed at an edge of the first plate 10, and a second guide member 60 having a second protrusion 62 oriented to the outside of the second plate 50 is formed at an edge of the second plate 50. Also, the first protrusion 22 of the first guide plate 20 is formed at a lower part with respect to the second protrusion 62 of the second guide member 60, and the first protrusion 22 and the second protrusion 62 are made to oppose each other while separating from each other.SELECTED DRAWING: Figure 3

Description

The present invention relates to a seismic isolation device that prevents a precision instrument or the like from tipping over when an earthquake occurs.

Until now, seismic isolation devices that suppress the shaking of precision equipment and arts and crafts in the event of an earthquake have been installed directly on the floor, and precision equipment and arts and crafts are exempted on top of it. The form of placing a seismic object has been widely used. For example, Patent Documents 1 to 3 disclose a two-layer structure composed of an upper structure and a lower structure, or a three-layer structure seismic isolation device having an intermediate structure between the upper structure and the lower structure. ..

In this seismic isolation device, a rolling element (ball) is sandwiched between each structure, and the ball moves freely along a trajectory (ball groove) provided in each structure, so that when an earthquake occurs, It works to suppress the shaking of the seismic isolated object. Further, in Patent Document 1, a guide member is provided at the edge portion of each plate so that the upper structure (upper plate) and the lower structure (lower plate) are not separated from each other, and in Patent Document 3, the uneven portion is placed in the center of each plate. It has a structure provided in the part.

Japanese Unexamined Patent Publication No. 2008-75828 Japanese Unexamined Patent Publication No. 2004-225884 JP-A-2002-54682

However, even if the seismic isolation device disclosed in Patent Documents 1 and 3 has a structure that is difficult to separate in the vertical direction, the position of the center of gravity of the seismic isolation object is changed when the upper plate moves to the final position, for example, when an earthquake occurs. If it is located at the end, the balance between the upper plate and the lower plate may be lost, and the upper plate may tilt.

In particular, the groove bottoms provided on the upper and lower plates of the seismic isolation device disclosed in Patent Document 1 have a gradient for returning to the origin position (position at rest), and as the upper plate moves away from the origin position. The structure is such that the gap between the upper plate and the lower plate widens. As a result, when an earthquake occurs, the upper plate moves to the final end, and if the center of gravity of the seismic isolation object is at the end, the upper and lower plates are out of balance (the upper plate is tilted), resulting in seismic isolation. There is a problem that the object falls over.

In addition, the inclination of the upper plate can be stopped by bringing the guide members on the edge of the seismic isolation device into contact with each other, but for that purpose, the gap between the upper and lower guide members is increased at the origin position of the seismic isolation device. There is a need. Therefore, the distance between the upper and lower plates is also increased, and when the fit between the groove provided in each plate and the ball is shallow, there arises a problem that the ball falls out of the groove when the upper plate moves.

Therefore, without changing the distance between the upper and lower plates at the origin position, even if the upper plate of the seismic isolation device moves to the final position in the event of an earthquake, the inclination of the upper plate due to the loading of the seismic isolation object is suppressed. The subject is to provide a seismic device.

In order to solve the above-mentioned problems, the present invention includes at least a first plate and a second plate having a plurality of grooves together, and a rolling element fitted into each groove of the first and second plates. By laminating the first plate on the second plate via these rolling elements, either the first plate or the second plate can be moved, and the grooves of the first and second plates can be moved. In a seismic isolation device having a bottom having the deepest slope in the center in the length direction, a first guide member having a first convex portion facing the first plate side at the edge of the first plate is first. It is formed along the moving direction of the plate.

Further, a second guide member having a second convex portion facing the outside of the second plate is formed at the edge of the second plate along the moving direction of the first plate. The first convex portion of the first guide member is located below the second convex portion of the second guide member, and the first convex portion of the first guide member and the second convex portion of the second guide member are mutually exclusive. Arrange them so that they face each other at a distance. Then, both the first convex portion of the first guide member and the second convex portion of the second guide member are inclined (have a gradient) along the moving direction of each plate.

The height (thickness) of the first convex portion is increased (larger) as the distance from the corner portion of the first plate is increased, and the height (thickness) of the second convex portion is the corner portion of the second plate. It may be lower (smaller) as it gets farther from. Further, the degree of inclination of the second convex portion along the moving direction of the second plate can be made larger than the degree of inclination of the first convex portion along the moving direction of the first plate.

The seismic isolation device of the present invention provides a guide member at the edge of each of the upper and lower plates, and by appropriately defining the distance between the plates, the seismic isolation device is seismically isolated even when the upper plate moves to the final position at the time of an earthquake. It has the effect of suppressing the tilt of the upper plate due to the loading of the object and reducing the risk of the seismic isolated object falling (risk of falling).

It is a top view of the seismic isolation device 100 which is one Embodiment of this invention. It is sectional drawing in line AA of FIG. It is an enlarged view of the X part in FIG. It is a perspective view from the front side of the 1st guide part 20. It is a perspective view from the front side of the 2nd guide part 60. It is a left side view of the 1st guide part 20. It is a right side view of the 2nd guide part 60. It is a right side view which shows the form of the seismic isolation device 100 of this invention at rest. It is a right side view which shows the form which the seismic isolation device 100 of this invention moved to an intermediate position. It is a right side view which shows the form which the seismic isolation device 100 of this invention moved to a final position.

An embodiment of the seismic isolation device of the present invention will be described with reference to the drawings. 1 is a plan view of the seismic isolation device 100 according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA shown in FIG. 1, and FIG. 3 is an enlargement of the X portion of the seismic isolation device 100 shown in FIG. It is a figure.

As shown in FIGS. 1 to 3, the seismic isolation device 100 of the present invention has a two-layer structure including a first plate (upper plate) 10 and a second plate (lower plate) 50. As shown in FIGS. 1 and 2, the upper plate 10 and the lower plate 50 are provided with two grooves 11 (11a, 11b) and 51 (51a, 51b), respectively, and the grooves 11, 51 are at the center. The upper plate 10 and the lower plate 50 are laminated so as to intersect at positions. Further, one rolling element (ball) B1 is fitted in a set of grooves 11a and 51a in which the upper plate 10 and the lower plate 50 face each other. Similarly, one rolling element (ball) B2 is fitted in a set of different grooves 11b and 51b.

The principle that the seismic isolation device 100 of the present invention operates (the upper plate 10 moves with respect to the lower plate 50) is that the two balls B1 and B2 have two grooves 11 (11a, 11b), 51 (51a,). By moving while rotating along 51b). Since the details of this principle are the same as those described in Japanese Patent No. 4517359 by the applicant, detailed description thereof will be omitted.

As shown in FIG. 3, guide portions (first guide portion 20, second guide portion 60) are provided on the edges of the upper plate 10 and the lower plate 50 (on the right side of the paper in FIGS. 1 and 2) constituting the seismic isolation device 100. ) Is provided. These guide portions 20 and 60 are provided along the moving directions (directions indicated by arrows in FIG. 1) of the upper and lower plates 10 and 50, respectively.

Next, FIGS. 4 and 5 show perspective views of the first guide portion (upper guide portion) 20 and the second guide portion (lower guide portion) 60 from the front side. The left side view of the upper guide portion 20 (arrow view B in FIG. 4) is shown in FIG. 6, and the right side view of the lower guide portion 60 (arrow view C in FIG. 5) is shown in FIG. The first guide portion (upper guide portion) 20 and the second guide portion (lower guide portion) 60 are formed from the first and second guide main bodies 21 and 61 and the first and second convex portions 22 and 62, respectively. There is.

As shown in FIG. 3, when the seismic isolation device 100 is stationary (the position of the origin), the first convex portion 22 of the upper guide portion 20 and the second convex portion 62 of the lower guide portion 60 are maintained at a constant distance. It is provided so as to face each other (separate from each other). In this case, the arrangement is such that the second convex portion 62 of the lower guide portion 60 is above the first convex portion 22 of the upper guide portion 20.

Further, as shown in FIGS. 3 and 4, the first convex portion 22 of the first guide portion (upper guide portion) 20 is provided so as to project toward the upper plate 10 side (inside) with respect to the first guide main body 21. Has been done. On the other hand, the second convex portion 62 of the second guide portion (lower guide portion) 60 projects to the side (outside) opposite to the lower plate 50 side with respect to the second guide main body 61 as shown in FIGS. 3 and 5. It is provided in a different form. The form in which the first and second convex portions 22, 62 are attached to the first and second guide portions 21, 61 may be any of removable means such as screwing and fixing means such as welding.

The left side view of the upper guide portion 20 is shown in FIG. 6, and the right side view of the lower guide portion 60 is shown in FIG. As shown in FIG. 6, the first convex portion 22 of the first guide portion (upper guide portion) 20 has the highest central position and the lowest slope at both ends in the moving direction of the upper plate 10 (arrows in FIG. 1). It is formed along the direction). On the other hand, as shown in FIG. 7, the second convex portion 62 of the second guide portion (lower guide portion) 60 has the lowest central position and the highest gradient at both ends in the moving direction of the upper plate 10. It is formed along.

Further, the gradient of the first convex portion 22 when viewed from the left side view of the upper guide portion 20 shown in FIG. 6 has an angle θ1 formed with the horizontal plane in the range of 1 ° or more and 3 ° or less. Similarly, the gradient of the second convex portion 62 when viewed from the right side view of the lower guide portion 60 shown in FIG. 7 also has an angle θ2 with the horizontal plane in the range of 1 ° or more and 3 ° or less. Further, the gradient θ2 of the second convex portion 62 of the second guide portion (lower guide portion) 60 is larger than or equal to the gradient θ1 of the first convex portion 22 of the first guide portion (upper guide portion) 20 (θ2). ≧ θ1).

Next, a mode in which the seismic isolation device of the present invention is operated when an earthquake occurs will be described with reference to the drawings. 8 to 10 show right side views of the seismic isolation device 100 of the present invention in a stationary state, a state in which the first plate (upper plate) has moved to an intermediate position, and a state in which the first plate (upper plate) has moved to the final position. First, when the seismic isolation device 100 of the present invention is stationary, both the upper plate 10 and the lower plate 50 are arranged at the same position in the vertical direction as shown in FIG.

At that time, the distance dC between the first convex portion 22 of the first guide portion (upper guide portion) 20 and the second convex portion 62 of the second guide portion (lower guide portion) 60 at the central position 50C of the lower plate 50 is shown in FIG. As shown in 8, it is the narrowest as compared with the distance between the upper plate 10 and the lower plate 50 in other places. In other words, the distance dL between the first convex portion 22 and the second convex portion 62 at a position separated by a distance (stroke) L from the central position 50C when the upper plate 10 moves to the final position when an earthquake occurs is the above-mentioned distance. It is arranged so as to be wider than dC.

When the seismic isolation device 100 moves to the intermediate position, that is, when the upper plate 10 moves by a distance of 2 / L, which is half the stroke L with respect to the lower plate 50, the upper and lower plates 10, 50 at the predetermined positions are shown in FIG. The intervals dC and dL are both smaller than those at rest. Further, when the seismic isolation device 100 moves to the final position, the upper plate 10 moves by a distance L from the central position, but the interval dC at the central position 50C at that time becomes even smaller, and the distance is zero. The first convex portion 22 of the first guide portion (upper guide portion) 20 of the upper plate 10 and the second convex portion 62 of the second guide portion (lower guide portion) 60 of the lower plate 50 are in complete contact with each other. ..

That is, the first convex portion 22 of the first guide portion (upper guide portion) 20 and the second convex portion 62 of the second guide portion (lower guide portion) 60 are in complete contact with each other, or the distance between them is close to zero. Therefore, even if the upper plate 10 moves to the final position when an earthquake occurs, it is possible to prevent only the upper plate 10 from tipping over due to the imbalance of the seismic isolation object (load).

10 1st plate 10C Central position of 1st plate 11 (11a, 11b) Groove 20 1st guide part 21 1st guide body 22 1st convex part 50 2nd plate 50C Central position of 2nd plate 51 (51a, 51b) Groove 60 2nd guide part 61 2nd guide body 62 2nd convex part 100 Seismic isolation device dC Of the 1st convex part and the 2nd convex part at the center position of the 2nd plate
Interval (distance)
dL Distance L away from the center position of the 1st and 2nd plates
Interval (distance) at position
B (B1, B2) Rolling body (ball)
L Stroke of seismic isolation device (horizontal movement amount)
θ1 Gradient of the first convex part of the first guide part (angle formed by the horizontal plane)
θ2 Gradient of the second convex part of the second guide part (angle formed by the horizontal plane)

Claims (3)

At least, the first and second plates having the plurality of grooves together and the plurality of rolling elements fitted in the grooves of the first and second plates are provided, and the rolling elements are provided through the rolling elements. By stacking the first plate on the second plate, either the first plate or the second plate can be moved, and the bottoms of the grooves of the first and second plates are formed. It is a seismic isolation device that has the deepest slope in the center in the length direction.
At the edge of the first plate, a first guide member having a first convex portion attached toward the first plate side is formed along the moving direction of the first plate, and the second plate is formed. At the edge of the plate, a second guide member having a second convex portion attached to the outside of the second plate is formed along the moving direction of the first plate, and the first convex portion is formed. Is located below the second convex portion, the first convex portion and the second convex portion are arranged so as to face each other while being separated from each other, and the first convex portion and the second convex portion are arranged so as to face each other. A seismic isolation device characterized in that it is inclined along the moving direction of each of the plates. The first convex portion is inclined so as to be higher as it is separated from both ends of the first plate, and the second convex portion is inclined so as to be lower as it is separated from both ends of the second plate. The seismic isolation device according to claim 1, wherein the seismic isolation device is provided. The seismic isolation device according to claim 2, wherein the gradient of the second convex portion with respect to the horizontal plane is equal to or greater than the gradient of the first convex portion with respect to the horizontal plane.

Images