JP7386947B1 - Seismic isolation device - Google Patents

Abstract

An object of the present invention is to provide a seismic isolation device that can improve inspection efficiency and prevent dust and water droplets from entering or staying in a sliding area.
A seismic isolation device 100 according to an aspect 1 of the present invention is a seismic isolation device 100 installed between an upper structure U and a lower structure L, and is installed at a lower part of the upper structure U. , a shoe 10 having a first concave spherical surface 10d facing downward, a spherical seat 20 disposed on the upper part of the lower structure L and having a first convex spherical surface 20p projecting upward, the shoe 10 and the spherical seat 20 The slider section 40 is disposed between the slider section 40 and includes a second convex spherical surface 40p that slides on the first concave spherical surface 10d, and a second concave spherical surface 40d that slides on the first convex spherical surface 20p.
[Selection diagram] Figure 2

Description

The present invention relates to a seismic isolation device.

In order to prevent horizontal displacement of the ground due to earthquake motion from being transmitted to structures such as buildings, a seismic isolation device called a sliding bearing is sometimes used. When dust or water droplets enter the sliding area of a sliding bearing, the friction coefficient of the sliding area changes. As a result, the performance of the sliding bearing is affected.
Patent Document 1 discloses a structure in which a dustproof sheet is attached in order to prevent the above-mentioned problem from occurring.

Patent No. 6945758

In the conventional structure, the periphery of the seismic isolation device is covered with a dustproof sheet. Therefore, each component of the seismic isolation device cannot be visually observed from the outside. To inspect the seismic isolation device, it is necessary to remove the dustproof sheet. Therefore, there is a problem with the ease of inspection. Furthermore, some dustproof sheets cannot prevent water droplets from entering the sliding area due to dew condensation or the like. Furthermore, if the concave shape has a structure facing upward, dust and water droplets may remain inside the concave shape.

The present invention has been made in view of the above-mentioned circumstances, and provides a seismic isolation device that can improve inspection efficiency and prevent dust and water droplets from entering or staying in a sliding area. The purpose is to

<1> The seismic isolation device according to aspect 1 of the present invention is a seismic isolation device installed between an upper structure and a lower structure, and is arranged at a lower part of the upper structure and faces downward. a shoe having a first concave spherical surface; a spherical seat disposed on the upper part of the lower structure and having a first convex spherical surface protruding upward; and a spherical seat disposed between the shoe and the spherical seat, the first The slider portion includes a second convex spherical surface that slides on the first concave spherical surface, and a second concave spherical surface that slides on the first convex spherical surface.

According to the invention, the shoe includes a shoe disposed at the lower part of the upper structure, a ball seat section arranged at the upper part of the lower structure, and a slider section arranged between the shoe and the ball seat section. .
Here, the first concave spherical surface of the shoe disposed on the upper structure faces downward. The second convex spherical surface of the slider portion slides on the first concave spherical surface. That is, the first concave spherical surface of the shoe is arranged to cover the second convex spherical surface of the slider portion. That is, according to this structure, the concave shape does not have an upwardly facing portion. Therefore, it is possible to create a structure in which dust and water droplets do not enter and remain between the first concave spherical surface and the second convex spherical surface.

Further, the first convex spherical surface of the spherical seat disposed on the lower structure projects upward. The second concave spherical surface of the slider portion slides on the first convex spherical surface. That is, the second concave spherical surface of the slider section is arranged to cover the first convex spherical surface of the spherical seat section. That is, according to this structure, the concave shape does not have an upwardly facing portion. Thereby, it is possible to create a structure in which dust and water droplets do not enter between the first convex spherical surface and the second concave spherical surface, and there is no room for them to remain therein.
With the structure as described above, it is possible to prevent dust and water droplets from entering or staying in the sliding area of the seismic isolation device. Therefore, it is not necessary to provide a dustproof sheet. Therefore, inspection efficiency can be improved.

<2> In the seismic isolation device according to aspect 2 of the present invention, in the seismic isolation device according to aspect 1, the slider portion vertically connects the peripheral edge of the second convex spherical surface and the peripheral edge of the second concave spherical surface. a contour line of the first convex spherical surface when the seismic isolation device is viewed from a first horizontal direction among the horizontal directions; , a contour line of the outer circumferential surface of the slider portion that forms an intersection with the first contour line at a lower end of the contour line of the outer circumferential surface is defined as a second contour line; An angle between a tangent to the contour line and the second contour line, and an angle on the slider portion side, is 90° or more.

According to this invention, the angle formed by the tangent to the first contour line and the second contour line at the intersection, on the slider portion side, is 90° or more. Thereby, it is possible to prevent stress concentration from occurring at the boundary between the tangent to the first contour line and the second contour line in the slider portion. Therefore, the part can be made less likely to wear out. Furthermore, by making the shape of the slider portion thick in this area, the durability of the slider portion can be improved.

<3> In the seismic isolation device according to aspect 3 of the present invention, in the seismic isolation device according to aspect 1, the slider portion vertically connects the periphery of the second convex spherical surface and the periphery of the second concave spherical surface. a contour line of the first convex spherical surface when the seismic isolation device is viewed from a first horizontal direction among the horizontal directions; , a contour line of the outer circumferential surface of the slider portion that forms an intersection with the first contour line at a lower end of the contour line of the outer circumferential surface is defined as a second contour line; An angle formed by a tangent to the contour line and the second contour line, the angle on the side of the slider portion being less than 90°, and at the boundary between the first contour line and the second contour line. , an arcuate portion is formed.

According to this invention, the angle between the tangent of the first contour line and the second contour line at the intersection point, on the side of the slider portion, is less than 90°, and the angle between the first contour line and the second contour line is less than 90°. An arcuate portion is formed at the boundary with the contour line. By setting the angle of the part to be less than 90°, it is possible to easily comply with layout requirements at the location where the seismic isolation device is installed, for example. Furthermore, by forming the arcuate portion at the boundary between the first contour line and the second contour line, stress concentration is less likely to occur at the boundary between the tangent to the first contour line and the second contour line in the slider portion. be able to. Therefore, the part can be made less likely to wear out.

<4> The seismic isolation device according to aspect 4 of the present invention is the seismic isolation device according to any one of aspects 1 to 3, in which the outer peripheral surface of the slider portion is tapered located on the side of the spherical seat portion. and a straight part located on the side of the shoe.

Here, a friction material may be disposed between the slider portion and the shoe. The friction material is, for example, a woven fabric made of fibers. The friction material is attached and fixed to the slider portion. On the other hand, the outer circumferential surface of the slider portion includes a tapered portion located on the ball seat side and a straight portion located on the shoe shoe side. Thereby, the end portion of the friction material can be fixed to the straight portion. Therefore, it is possible to easily arrange the friction material on the slider portion.

<5> In the seismic isolation device according to aspect 5 of the present invention, in the seismic isolation device according to any one of aspects 1 to 4, at least one of the first convex spherical surface or the second concave spherical surface , a friction material is provided.

According to this invention, the friction material is provided on at least one of the first convex spherical surface and the second concave spherical surface. This makes it easier to slide between the first convex spherical surface and the second concave spherical surface.

<6> The seismic isolation device according to aspect 6 of the present invention is the seismic isolation device according to any one of aspects 1 to 4, in which at least one of the first convex spherical surface or the second concave spherical surface , a solid lubricant is provided.

According to this invention, the solid lubricant is provided on at least one of the first convex spherical surface and the second concave spherical surface. This makes it easier to slide between the first convex spherical surface and the second concave spherical surface.

<7> The seismic isolation device according to aspect 7 of the present invention is the seismic isolation device according to any one of aspects 1 to 4, in which at least one of the first convex spherical surface or the second concave spherical surface , an oil passage is provided.

According to this invention, the oil passage is provided on at least one of the first convex spherical surface and the second concave spherical surface. This makes it easier to slide between the first convex spherical surface and the second concave spherical surface.

<8> A seismic isolation device according to aspect 8 of the present invention is the seismic isolation device according to any one of aspects 1 to 7, further comprising a base plate disposed on the lower structure, and wherein the spherical seat portion is , is fixed to the base plate by a fastening member, and the fastening member is disposed at a position that does not interfere with the slider portion even when the shoe and the slider portion move relative to each other to the maximum extent in the horizontal direction.

According to this invention, the spherical seat portion is fixed to the base plate with a fastening member. Thereby, for example, the ball seat can be made replaceable. This aspect has a particularly significant effect, for example, when the ball seat needs to be replaced periodically. Further, the fastening member is arranged at a position where it does not interfere with the slider portion even when the shoe and the slider portion move relative to each other to the maximum extent in the horizontal direction. This can prevent the fastening member from affecting the movement of the slider section.

<9> A seismic isolation device according to aspect 9 of the present invention is the seismic isolation device according to any one of aspects 1 to 7, further comprising a base plate disposed on the lower structure, and wherein the spherical seat portion is , welded to the base plate.

According to this invention, the spherical seat is welded to the base plate. This makes it possible to eliminate the need for countermeasures against loosening of the fastening member, compared to, for example, a case where the spherical seat portion is fastened to the base plate by a fastening member. Therefore, for example, the frequency of maintenance can be reduced or eliminated.

According to the present invention, it is possible to provide a seismic isolation device that can improve inspection efficiency and prevent dust and water droplets from entering or staying in a sliding area.

FIG. 1 is a perspective view of a seismic isolation device according to the present invention. FIG. 2 is a front sectional view of the seismic isolation device shown in FIG. 1. FIG. This is an example in which the seismic isolation device shown in FIG. 1 has been deformed to its limit due to an earthquake. 3 is an enlarged view of section IV in FIG. 2. FIG. This is a modification of the part shown in FIG. 4. This is an example in which a friction material is provided on the second convex spherical surface of the slider portion. This is an example in which a friction material is provided on the second concave spherical surface of the slider portion. This is an example in which an oil passage is provided on the second concave spherical surface of the slider portion. It is a front sectional view of the seismic isolation device provided with the modification of the slider part. 9 is an enlarged view of the X section in FIG. 9. FIG.

Hereinafter, a seismic isolation device 100 according to an embodiment of the present invention will be described with reference to the drawings. The seismic isolation device 100 according to this embodiment is installed between an upper structure U and a lower structure L. The upper structure U is, for example, a building such as a high-rise building or a bridge. The lower structure L is, for example, a foundation structure installed on the ground. The seismic isolation device 100 is provided to prevent horizontal displacement of the ground due to earthquake motion from being transmitted to a building. For example, a plurality of seismic isolation devices 100 are provided at intervals in one building.

As shown in FIGS. 1 and 2, the seismic isolation device 100 includes a shoe 10, a ball seat portion 20, a base plate 30, and a slider portion 40.
The shoe 10 is arranged at the lower part of the upper structure U. The shoe 10 is formed, for example, in a rectangular shape. The shoe 10 includes a first concave spherical surface 10d facing downward. The first concave spherical surface 10d is a sliding surface that slides on a second convex spherical surface 40p, which will be described later. The first concave spherical surface 10d is formed in a circular shape in plan view. Further, as shown in FIG. 2, the first concave spherical surface 10d is formed in an arc shape in a cross-sectional view taken along the horizontal direction. The shoe 10 is fixed to the upper structure U with a bolt, for example. The shoe 10 may be fixed to the upper structure U by welding.

The spherical seat part 20 is arranged at the upper part of the lower structure L. The upper side of the spherical seat portion 20 is provided with a first convex spherical surface 20p that projects upward. The spherical seat portion 20 is a sliding surface that slides on a second concave spherical surface 40d, which will be described later. The first convex spherical surface 20p is formed in a circular shape in plan view. Further, as shown in FIG. 2, the first convex spherical surface 20p is formed in an arc shape in a cross-sectional view viewed along the horizontal direction.
The lower side of the spherical seat part 20 is provided with a mounting part 20a fixed to the lower structure L. In this embodiment, the spherical seat portion 20 is arranged on the lower structure L via the base plate 30.
The shoe 10 and the ball seat 20 are made of, for example, rolled steel for welded structures (SM490A, B, C, or SN490B, C, etc.), carbon steel for machine structures such as S45C, SUS, cast steel, cast iron, etc. be done.

The base plate 30 is a plate-shaped member disposed on the lower structure L. The base plate 30 is fixed to the lower structure L with bolts, for example. The base plate 30 may be fixed to the lower structure L by welding. The base plate 30 is formed of, for example, a rolled steel material for welded structures (SM490A, B, C, or SN490B, C, or S45C), SUS material, cast steel material, cast iron, or the like.

The mounting portion 20a of the spherical seat portion 20 and the base plate 30 are fixed, for example, with a fastening member 20f. The fastening member 20f is, for example, a bolt. In this case, the mounting portion 20a of the ball seat portion 20 is provided with a bolt hole 20h. As shown in FIG. 3, the fastening member 20f is arranged at a position where it does not interfere with the slider section 40 even when the shoe 10 and the slider section 40 move relative to each other to the maximum extent in the horizontal direction. That is, the bolt hole 20h of the attachment portion 20a is provided at a position sufficiently distant from the first convex spherical surface 20p (details will be described later).
The attachment portion 20a of the spherical seat portion 20 and the base plate 30 may be welded to the base plate 30. In this case, the bolt hole 20h may not be provided in the mounting portion 20a.

The slider section 40 is arranged between the shoe 10 and the ball seat section 20. The slider section 40 slides on each of the shoe 10 and the ball seat section 20. As a result, when an earthquake occurs, for example, the upper structure U and the lower structure L are moved relative to each other in the horizontal direction, as shown in FIG. This prevents horizontal displacement of the ground (lower structure L) due to earthquake motion from being transmitted to the building. As shown in FIG. 3, the shoe 10 and the slider section 40 move relative to each other until the slider section 40 contacts the inner wall 10w of the first concave spherical surface 10d of the shoe 10 (that is, the outer wall of the first concave spherical surface 10d). It is possible. In other words, the case where the shoe 10 and the slider section 40 have made the maximum relative movement in the horizontal direction is the case where the slider section 40 has contacted the inner wall 10w of the first concave spherical surface 10d of the shoe 10.

In this embodiment, the shoe 10 is provided with the inner wall 10w as described above. The present invention is not limited to this, and the shoe 10 may not be provided with the inner wall 10w. In this case, it is preferable that the shoe 10 is sized to have a sufficient margin so that the slider section 40 does not deviate from the shoe 10 due to unexpected relative movement between the shoe 10 and the slider section 40. Alternatively, instead of the inner wall 10w, a stopper may be provided on the outer periphery of the shoe 10 to prevent the slider portion 40 from slipping off.

In this embodiment, the fastening member 20f is provided at the following position. That is, from the state before the upper structure U and the lower structure L move relative to each other, the upper structure U and the lower structure L move relative to each other, and the slider part 40 comes into contact with the stopper of the shoe 10. However, the fastening member 20f and the slider portion 40 are provided at a position where they do not interfere until further movement in the same direction is restricted.
The slider portion 40 is made of, for example, rolled steel for welded structures (SM490A, B, C, or SN490B, C, etc.), carbon steel for machine structures such as S45C, SUS, cast steel, cast iron, or the like.

The slider portion 40 is formed, for example, in a substantially disk shape, and includes a second convex spherical surface 40p, a second concave spherical surface 40d, and an outer circumferential surface 40s.
The second convex spherical surface 40p is located above the slider section 40. The second convex spherical surface 40p is a sliding surface that slides on the first concave spherical surface 10d of the shoe 10. The second convex spherical surface 40p is formed in a circular shape in plan view. Further, as shown in FIG. 2, the second convex spherical surface 40p is formed in an arc shape in a cross-sectional view viewed along the horizontal direction. The curvatures of the first concave spherical surface 10d and the second convex spherical surface 40p of the shoe 10 match each other. Further, the diameter of the second convex spherical surface 40p in plan view is smaller than the diameter of the first concave spherical surface 10d of the shoe 10. Thereby, as shown in FIG. 2, the first concave spherical surface 10d of the shoe 10 is arranged to cover the second convex spherical surface 40p of the slider portion 40.

The second concave spherical surface 40d is located below the slider portion 40. The second concave spherical surface 40d is a sliding surface that slides on the first convex spherical surface 20p of the spherical seat portion 20. The second concave spherical surface 40d is formed in a circular shape in plan view. Further, as shown in FIG. 2, the second concave spherical surface 40d is formed in an arc shape in a cross-sectional view viewed along the horizontal direction. The curvatures of the first convex spherical surface 20p and the second concave spherical surface 40d of the spherical seat portion 20 match each other. The second concave spherical surface 40d is arranged to fit into the first convex spherical surface 20p of the spherical seat portion 20. As shown in FIG. 2, the second concave spherical surface 40d is arranged to cover the first convex spherical surface 20p of the spherical seat portion 20.

In this embodiment, the curvatures of the first concave spherical surface 10d and the second convex spherical surface 40p located on the upper side with respect to the slider part 40 are greater than the curvatures of the second concave spherical surface 40d and the first convex spherical surface 20p located on the lower side. small. In other words, the radius of curvature of the first concave spherical surface 10d and the second convex spherical surface 40p is larger than the radius of curvature of the second concave spherical surface 40d and the first convex spherical surface 20p. As a result, the sliding motion between the shoe 10 and the slider section 40 and the sliding motion between the slider section 40 and the ball seat section 20 are compared as follows.

That is, for example, when the upper structure U and the lower structure L move relative to each other in the horizontal direction due to an earthquake, the amount of relative movement between the shoe 10 and the slider section 40 is equal to the relative movement between the slider section 40 and the ball seat section 20. larger than the amount of movement.
Furthermore, the rotation angle of the slider section 40 when the shoe 10 and the slider section 40 move relative to each other by an arbitrary distance is the rotation angle of the slider section 40 when the slider section 40 and the ball seat section 20 move relative to each other by the same distance. smaller than the rotation angle. Note that the rotation angle refers to a rotation angle whose rotation axis is a direction perpendicular to the direction in which the upper structure U and the lower structure L move relative to each other in the horizontal direction.
When setting the curvatures of the first concave spherical surface 10d and the second convex spherical surface 40p, and the curvatures of the second concave spherical surface 40d and the first convex spherical surface 20p, the above characteristics are taken into consideration, and the seismic isolation device 100 can be installed. It is preferable that this is determined in consideration of the size of the area and the like.

The outer peripheral surface 40s vertically connects the peripheral edge of the second convex spherical surface 40p and the peripheral edge of the second concave spherical surface 40d. In this embodiment, the outer peripheral surface 40s includes a straight portion 40s1 and a tapered portion 40s2.
The straight portion 40s1 is located on the shoe 10 side. That is, the straight portion 40s1 is located above the slider portion 40. In this embodiment, the straight portion 40s1 is formed in a straight line along the up-down direction, as shown in FIG. For example, a friction material 40F, which will be described later, is attached to the straight portion 40s1. The straight portion 40s1 may be formed into an arc shape, for example, as long as there is no problem in attaching the friction material 40F.
The tapered portion 40s2 is located on the spherical seat portion 20 side. That is, the tapered portion 40s2 is located below the slider portion 40. The tapered portion 40s2 is formed such that the outer diameter of the slider portion 40 decreases from above to below.

Here, the parts of the ball seat part 20 and the slider part 40 are defined as follows.
That is, as shown in FIGS. 4 and 5, when the seismic isolation device 100 is viewed from the first horizontal direction in a state where no vibration is input to the seismic isolation device 100, the first convex spherical surface Let the contour line of 20p be the first contour line C1.
The contour line of the outer circumferential surface 40s of the slider portion 40 when the seismic isolation device 100 is viewed from the first horizontal direction in a state where no vibration is input to the seismic isolation device 100. A contour line that forms an intersection C with the first contour line C1 at the lower end is defined as a second contour line C2.

At this time, the angle formed by the tangent of the first contour line C1 at the intersection C and the second contour line C2 in a state where no vibration is input to the seismic isolation device 100, and which is the angle on the slider part 40 side. A is, for example, 90° or more. By forming the slider portion 40 into such a shape, stress concentration at the intersection point C is prevented. Note that it is preferable that the intersection C is rounded to a radius of about 5 mm and has an outwardly bulging shape (not shown).

Note that if the above-mentioned shape is not possible due to the conditions of the location where the seismic isolation device 100 is installed, the angle A may be less than 90°. In this case, it is preferable that an arcuate portion CR be formed at the boundary between the first contour line C1 and the second contour line C2. The arcuate portion CR is, for example, an R process with a radius of 5 mm or more at the boundary between the first contour line C1 and the second contour line C2. This preferably prevents stress concentration from occurring at the intersection C even if the angle A is less than 90°.

For example, a friction material 40F is provided on at least one of the first convex spherical surface 20p and the second concave spherical surface 40d. Here, the friction material 40F is, for example, a friction material made of at least PTFE. The friction material 40F is formed of a double-woven fabric, and the double-woven fabric is formed of PTFE fibers (polytetrafluoroethylene) and fibers having a higher tensile strength than the PTFE fibers (high-strength fibers). Here, "fibers with higher tensile strength than PTFE fibers" include polyamides such as nylon 6/6, nylon 6, and nylon 4/6, polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene terephthalate. Examples include fibers such as polyester such as phthalate and para-aramid. Further examples include fibers such as meta-aramid, polyethylene, polypropylene, glass, carbon, polyphenylene sulfide (PPS), LCP, polyimide, and PEEK. Furthermore, heat-fusible fibers, cotton, wool, and other fibers may be used. Among these, PPS fibers, which have excellent chemical resistance, hydrolysis resistance, and extremely high tensile strength, are desirable.

The friction material made of at least PTFE may be a woven fabric containing PTFE fibers other than double woven fabric, and may also include a friction material made only of PTFE, a friction material made of a composite material of PTFE and other resin, The friction material may have a laminated structure of a friction material made of PTFE and a friction material made of another resin.

In this embodiment, the friction material 40F is provided on the second convex spherical surface 40p of the slider portion 40, for example, as shown in FIG. The friction material 40F may be provided on the second concave spherical surface 40d of the slider portion 40, as shown in FIG. Alternatively, the friction material 40F may be provided on both the second convex spherical surface 40p and the second concave spherical surface 40d.
As mentioned above, the friction material 40F is a double-woven fabric. It is preferable that the friction material 40F is arranged so as to cover the second convex spherical surface 40p or the second concave spherical surface 40d, and is fixed by pasting the end portion to the straight portion 40s1 of the outer circumferential surface 40s.

A solid lubricant may be provided on at least one of the first convex spherical surface 20p and the second concave spherical surface 40d. For example, graphite or the like is preferably used as the solid lubricant. The solid lubricant is, for example, arranged in dots in depressions provided on the surface of the first convex spherical surface 20p or the second concave spherical surface 40d. The solid lubricant may be linearly arranged in a groove provided on the surface of the first convex spherical surface 20p or the second concave spherical surface 40d. Ordinary grease may be provided on at least one of the first convex spherical surface 20p and the second concave spherical surface 40d instead of the solid lubricant.

As shown in FIG. 8, an oil passage OP may be provided on at least one of the first convex spherical surface 20p and the second concave spherical surface 40d. The oil passage OP is a groove provided on the surface of the first convex spherical surface 20p or the second concave spherical surface 40d. Lubricating oil is injected into the oil path OP. This reduces the friction of the sliding part. In addition, when providing the oil path OP, it is preferable to periodically fill it with lubricating oil. For example, as shown in FIG. 8, the oil passages OP are provided radially from the center of the first convex spherical surface 20p or the second concave spherical surface 40d. In addition to this, an annular groove connecting the radial grooves may be provided. Further, a part of the oil passage OP may be provided with a wide groove to serve as an oil reservoir. In order to facilitate the injection of lubricating oil into the oil path OP, an injection port OI may be provided on the surface of the tapered portion 40s2.

As explained above, according to the seismic isolation device 100 according to the present embodiment, the shoe 10 arranged at the lower part of the upper structure U, the ball seat part 20 arranged at the upper part of the lower structure L, and the shoe 10 and a slider section 40 disposed between the ball seat section 20 and the ball seat section 20.
Here, the first concave spherical surface 10d of the shoe 10 disposed on the upper structure U faces downward. The second convex spherical surface 40p of the slider portion 40 slides on the first concave spherical surface 10d. That is, the first concave spherical surface 10d of the shoe 10 is arranged to cover the second convex spherical surface 40p of the slider portion 40. That is, according to this structure, the concave shape does not have an upwardly facing portion. Therefore, it is possible to create a structure in which dust and water droplets do not enter and remain between the first concave spherical surface 10d and the second convex spherical surface 40p.

Further, the first convex spherical surface 20p of the spherical seat portion 20 disposed on the lower structure L projects upward. The second concave spherical surface 40d of the slider portion 40 slides on the first convex spherical surface 20p. That is, the second concave spherical surface 40d of the slider portion 40 is arranged to cover the first convex spherical surface 20p of the spherical seat portion 20. That is, according to this structure, the concave shape does not have an upwardly facing portion. As a result, it is possible to create a structure in which dust and water droplets do not enter and remain between the first convex spherical surface 20p and the second concave spherical surface 40d.
With the above-described structure, it is possible to prevent dust and water droplets from entering or staying in the sliding area of the seismic isolation device 100. Therefore, it is not necessary to provide a dustproof sheet. Therefore, inspection efficiency can be improved.

Further, the angle A between the tangent to the first contour line C1 at the intersection point C and the second contour line C2, which is the angle A on the slider portion 40 side, is 90° or more. Thereby, stress concentration can be made difficult to occur at the boundary between the tangent to the first contour line C1 and the second contour line C2 in the slider portion 40. Therefore, the part can be made less likely to wear out. Further, by making the shape of the slider portion 40 thicker in this region, the durability of the slider portion 40 can be improved.

Further, the angle A between the tangent to the first contour line C1 at the intersection C and the second contour line C2, on the side of the slider portion 40, is less than 90°, and the angle A between the first contour line C1 and the second contour line C2 is less than 90°. An arcuate portion CR is formed at the boundary with the second contour line C2. By setting the angle A of the portion to be less than 90°, it is possible to easily comply with layout requirements at the installation location of the seismic isolation device 100, for example. Furthermore, since the arcuate portion CR is formed at the boundary between the first contour line C1 and the second contour line C2, the boundary between the tangent line of the first contour line C1 and the second contour line C2 in the slider portion 40 Stress concentration can be made less likely to occur. Therefore, the part can be made less likely to wear out.

Here, a friction material 40F may be disposed between the slider portion 40 and the shoe 10. The friction material 40F is, for example, a woven fabric made of fibers. The friction material 40F is attached and fixed to the slider portion 40. On the other hand, the outer circumferential surface 40s of the slider portion 40 includes a tapered portion 40s2 located on the ball seat portion 20 side and a straight portion 40s1 located on the shoe 10 side. Thereby, the end portion of the friction material 40F can be fixed to the straight portion 40s1. Therefore, it is possible to easily arrange the friction material 40F on the slider portion 40.

Furthermore, a friction material 40F is provided on at least one of the first convex spherical surface 20p and the second concave spherical surface 40d. This makes it easier to slide between the first convex spherical surface 20p and the second concave spherical surface 40d.

Furthermore, a solid lubricant is provided on at least one of the first convex spherical surface 20p and the second concave spherical surface 40d. This makes it easier to slide between the first convex spherical surface 20p and the second concave spherical surface 40d.

Further, an oil passage OP is provided on at least one of the first convex spherical surface 20p and the second concave spherical surface 40d. This makes it easier to slide between the first convex spherical surface 20p and the second concave spherical surface 40d.

Further, the spherical seat portion 20 is fixed to the base plate 30 with a fastening member 20f. Thereby, for example, the ball seat portion 20 can be made replaceable. This aspect brings about a particularly remarkable effect, for example, when the ball seat part 20 needs to be replaced regularly. Further, the fastening member 20f is arranged at a position where it does not interfere with the slider portion 40 even when the shoe 10 and the slider portion 40 move relative to each other to the maximum extent in the horizontal direction. This can prevent the fastening member 20f from affecting the movement of the slider section 40.

Further, the ball seat portion 20 is welded to the base plate 30. This makes it unnecessary to take measures against the loosening of the fastening member 20f, compared to, for example, the case where the spherical seat portion 20 is fastened to the base plate 30 by the fastening member 20f. Therefore, for example, the frequency of maintenance can be reduced or it can be made unnecessary.

Note that the technical scope of the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention.
For example, the friction material 40F, solid lubricant, and oil passage OP may be provided on either the first concave spherical surface 10d or the second convex spherical surface 40p.
Further, as shown in FIGS. 9 and 10, the arcuate portion CR of the slider portion 40 does not need to be directly connected to the outline of the tapered portion 40s2. For example, a thinned portion 40g may be formed between the arcuate portion CR and the tapered portion 40s2.

In addition, without departing from the spirit of the present invention, the components in the embodiments described above may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate.

10 Shoe 10d First concave spherical surface 20 Spherical seat portion 20f Fastening member 20p First convex spherical surface 30 Base plate 40 Slider portion 40d Second concave spherical surface 40F Friction material 40p Second convex spherical surface 40s Outer peripheral surface 40s1 Straight portion 40s2 Tapered portion 100 Seismic isolation device A Angle C Intersection C1 First contour C2 Second contour CR Arc-shaped portion L Lower structure OP Oil passage U Upper structure

Claims (12)

A seismic isolation device installed between an upper structure and a lower structure,
a shoe disposed at a lower part of the upper structure and having a first concave spherical surface facing downward;
a spherical seat portion disposed on the upper part of the lower structure and having a first convex spherical surface protruding upward;
a slider section that is disposed between the shoe and the spherical seat section and includes a second convex spherical surface that slides on the first concave spherical surface, and a second concave spherical surface that slides on the first convex spherical surface;
Equipped with
In plan view, the first convex spherical surface is located within a region where the slider portion is present,
the spherical seat portion is fixed to the lower structure;
Seismic isolation device. A seismic isolation device installed between an upper structure and a lower structure,
a shoe disposed at a lower part of the upper structure and having a first concave spherical surface facing downward;
a spherical seat portion disposed on the upper part of the lower structure and having a first convex spherical surface protruding upward;
a slider section that is disposed between the shoe and the spherical seat section and includes a second convex spherical surface that slides on the first concave spherical surface, and a second concave spherical surface that slides on the first convex spherical surface;
Equipped with
The slider portion includes an outer peripheral surface that vertically connects a peripheral edge of the second convex spherical surface and a peripheral edge of the second concave spherical surface,
A contour line of the first convex spherical surface when the seismic isolation device is viewed from a first horizontal direction is a first contour line;
A contour line of the outer circumferential surface of the slider portion when viewed from the first horizontal direction, the contour line forming an intersection with the first contour line at the lower end of the contour line of the outer circumferential surface. As a contour line,
The angle between the tangent to the first contour line and the second contour line at the intersection point, and the angle on the slider part side is 90° or more,
the spherical seat portion is fixed to the lower structure;
Seismic isolation device. A seismic isolation device installed between an upper structure and a lower structure,
a shoe disposed at a lower part of the upper structure and having a first concave spherical surface facing downward;
a spherical seat portion disposed on the upper part of the lower structure and having a first convex spherical surface protruding upward;
a slider section that is disposed between the shoe and the spherical seat section and includes a second convex spherical surface that slides on the first concave spherical surface, and a second concave spherical surface that slides on the first convex spherical surface;
Equipped with
The slider portion includes an outer peripheral surface that vertically connects a peripheral edge of the second convex spherical surface and a peripheral edge of the second concave spherical surface,
A contour line of the first convex spherical surface when the seismic isolation device is viewed from a first horizontal direction is a first contour line;
A contour line of the outer circumferential surface of the slider portion when viewed from the first horizontal direction, the contour line forming an intersection with the first contour line at the lower end of the contour line of the outer circumferential surface. As a contour line,
The angle between the tangent to the first contour line and the second contour line at the intersection point, and the angle on the slider part side is less than 90°,
An arcuate portion is formed at the boundary between the first contour line and the second contour line,
The spherical seat portion does not have a portion where the concave shape faces upward.
Seismic isolation device. A seismic isolation device installed between an upper structure and a lower structure,
a shoe disposed at a lower part of the upper structure and having a first concave spherical surface facing downward;
a spherical seat portion disposed on the upper part of the lower structure and having a first convex spherical surface protruding upward;
a slider section that is disposed between the shoe and the spherical seat section and includes a second convex spherical surface that slides on the first concave spherical surface, and a second concave spherical surface that slides on the first convex spherical surface;
Equipped with
The outer peripheral surface of the slider portion is
a tapered portion located on the side of the spherical seat portion;
a straight part located on the side of the shoe;
Equipped with
Seismic isolation device. A seismic isolation device installed between an upper structure and a lower structure,
a shoe disposed at a lower part of the upper structure and having a first concave spherical surface facing downward;
a spherical seat portion disposed on the upper part of the lower structure and having a first convex spherical surface protruding upward;
a slider section that is disposed between the shoe and the spherical seat section and includes a second convex spherical surface that slides on the first concave spherical surface, and a second concave spherical surface that slides on the first convex spherical surface;
Equipped with
further comprising a base plate disposed on the lower structure,
The spherical seat portion is fixed to the base plate with a fastening member,
The fastening member is arranged at a position where it does not interfere with the slider part even when the shoe and the slider part move relative to each other in the horizontal direction to the maximum extent ,
The spherical seat portion does not have a portion where the concave shape faces upward.
Seismic isolation device. A seismic isolation device installed between an upper structure and a lower structure,
a shoe disposed at a lower part of the upper structure and having a first concave spherical surface facing downward;
a spherical seat portion disposed on the upper part of the lower structure and having a first convex spherical surface protruding upward;
a slider section that is disposed between the shoe and the spherical seat section and includes a second convex spherical surface that slides on the first concave spherical surface, and a second concave spherical surface that slides on the first convex spherical surface;
Equipped with
further comprising a base plate disposed on the lower structure,
the spherical seat part is welded to the base plate ,
The spherical seat portion does not have a portion where the concave shape faces upward.
Seismic isolation device. A seismic isolation device installed between an upper structure and a lower structure,
a shoe disposed at a lower part of the upper structure and having a first concave spherical surface facing downward;
a spherical seat portion disposed on the upper part of the lower structure and having a first convex spherical surface protruding upward;
a slider section that is disposed between the shoe and the spherical seat section and includes a second convex spherical surface that slides on the first concave spherical surface, and a second concave spherical surface that slides on the first convex spherical surface;
Equipped with
It has multiple sliding areas that overlap in the vertical direction,
Among the plurality of sliding areas, the lower sliding area is narrower than the upper sliding area and is provided inside the upper sliding area.
Seismic isolation device. A friction material is provided on at least one of the first convex spherical surface and the second concave spherical surface,
The seismic isolation device according to any one of claims 1 to 7 . A solid lubricant is provided on at least one of the first convex spherical surface and the second concave spherical surface,
The seismic isolation device according to any one of claims 1 to 7 . an oil passage is provided on at least one of the first convex spherical surface and the second concave spherical surface;
The seismic isolation device according to any one of claims 1 to 7 . further comprising a base plate disposed on the lower structure,
The spherical seat portion is fixed to the base plate with a fastening member,
The fastening member is disposed at a position that does not interfere with the slider portion even when the shoe and the slider portion move relative to each other to the maximum extent in the horizontal direction.
The seismic isolation device according to any one of claims 1 to 4. further comprising a base plate disposed on the lower structure,
the spherical seat portion is welded to the base plate;
The seismic isolation device according to any one of claims 1 to 4.

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