JP7499928B1 - Sliding bearings and seismic isolation structures - Google Patents

Abstract

[Problem] To provide a sliding bearing and seismic isolation structure that can secure space for the work of attaching fastening members to the upper and lower shoes. [Solution] The sliding bearing 1 comprises an upper shoe 10 that is fixed to the upper structure with fastening members, and a lower shoe 20 that is fixed to the lower structure with fastening members, and at least one of the upper shoe 10 and the lower shoe 20 has recessed portions 15, 25 formed in a recessed state from the side to form a work space for attaching the fastening members. [Selected Figure] Figure 2

Description

The present invention relates to sliding bearings and seismic isolation structures.

Sliding bearings are known as seismic isolation devices installed in buildings and the like. Sliding bearings have an upper shoe and a lower shoe that face each other in the vertical direction. The upper shoe is fixed to the upper structure with fastening members such as bolts, and the lower shoe is fixed to the lower structure with fastening members such as bolts. The distance between the outer periphery on the lower surface of the upper shoe and the outer periphery on the upper surface of the lower shoe is small. Therefore, if the upper shoe and the lower shoe, which are rectangular in plan view, are arranged with the same plan view orientation, it is not possible to secure vertical space according to the length of the fastening member, and installation work cannot be performed. Therefore, in the past, the plan view orientation of the upper shoe and the lower shoe has been made different to secure work space for attaching fastening members to the fixed parts of the upper shoe and the lower shoe (for example, Patent Document 1 below).

JP 2020-33716 A

When the upper and lower shoes, which are rectangular in plan view, are arranged so that the upper and lower shoes have different plan view orientations, the overall external shape of the sliding support becomes large, which increases the area occupied in plan view, and is disadvantageous in terms of the design of the structure. Even if the upper and lower shoes are arranged so that the plan view orientations are different, there are cases where a sufficient amount of space cannot be secured between the lower structure and the lower surface of the upper shoe, or between the upper structure and the upper surface of the lower shoe. In such cases, a concave space (box cutout portion) that is recessed in the vertical direction in the upper structure or lower structure can be formed to secure the space. However, forming a box cutout portion in the upper structure or lower structure can cause cross-sectional defects in the upper structure or lower structure, and can require a lot of work on site. For this reason, there is a demand for a sliding support that can secure space for the work of attaching fastening members to the upper and lower shoes.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a sliding bearing and seismic isolation structure that can secure space for the installation of fastening members to the upper and lower shoes.

The sliding bearing according to one aspect of the present invention is a sliding bearing disposed between an upper structure and a lower structure facing the upper structure, and includes an upper shoe fixed to the upper structure with a fastening member, and a lower shoe fixed to the lower structure with a fastening member, and at least one of the upper shoe and the lower shoe has a recessed portion recessed from the side to form a working space for attaching the fastening member.

The seismic isolation structure according to one aspect of the present invention comprises the sliding bearing, the upper structure, and the lower structure, and the sliding bearing is an intermediate-layer seismic isolation that is disposed between the upper structure as the upper layer of the building and the lower structure as the lower layer of the building.

The present invention provides a sliding bearing and seismic isolation structure that ensures space for attaching fastening members to the upper and lower shoes.

1 is a front cross-sectional view of a sliding bearing and seismic isolation structure according to the first embodiment. FIG. FIG. 2 is a perspective view of the sliding bearing according to the first embodiment. FIG. 2 is a plan view of the sliding bearing according to the first embodiment. 4 is a half-sectional view of the sliding bearing according to the first embodiment taken along line AA in FIG. 3. FIG. 11 is a perspective view of a sliding bearing according to a second embodiment. FIG. 11 is a plan view of a sliding bearing according to a second embodiment. FIG. 11 is a perspective view of a sliding bearing according to a third embodiment. FIG. 11 is a plan view of a sliding bearing according to a third embodiment. 9 is a half-sectional view of the sliding bearing according to the third embodiment taken along line BB in FIG. 8 . A front cross-sectional view of the second sliding bearing according to the fourth embodiment. FIG. 13 is a perspective view of a second sliding bearing according to the fourth embodiment. A plan view of the second sliding bearing according to the fourth embodiment. FIG. 13 is a diagram showing a seismic isolation structure according to a fourth embodiment.

First Embodiment
A sliding bearing 1 and a seismic isolation structure 100 according to a first embodiment of the present invention will be described below with reference to Figures 1 to 4. As shown in Figure 1, the seismic isolation structure 100 has an upper structure U, a lower structure L, and a sliding bearing 1. The upper structure U and the lower structure L face each other in the vertical direction. The sliding bearing 1 is disposed between the upper structure U and the lower structure L. When an earthquake motion occurs, the sliding bearing 1 causes relative displacement between the upper structure U and the lower structure L in the horizontal direction. This suppresses the transmission of vibrations from the lower structure L to the upper structure U.

For example, the sliding bearing 1 is placed in the middle layer of a structure such as a building, and is used for middle layer seismic isolation. In this case, for example, the upper structure U is the upper layer of the building, and the lower structure L is the lower layer of the building. The sliding bearing 1 may be used for column head seismic isolation, which is a type of middle layer seismic isolation. In this case, the lower structure L is the column head of the column. The sliding bearing 1 may also be used for base seismic isolation.

The sliding bearing 1 has an upper shoe 10, a lower shoe 20, and a slider 30 that slides between the upper shoe 10 and the lower shoe 20.

The upper shoe 10 is disposed under the upper structure U. The upper shoe 10 is fixed to the upper structure U by fastening members F such as bolts so that it cannot move relative to the upper structure U. The upper shoe 10 is a rectangular plate material in a plan view. The upper shoe 10 is formed from rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C) or the like.

The lower surface of the upper shoe 10 is provided with an upper sliding surface 11, which is a concave spherical surface. The upper sliding surface 11 is formed in a circular shape in a plan view. A stainless steel sliding plate (not shown) is fixed to the upper sliding surface 11. In addition, an upper stopper ring 12, which is annular in a plan view, is fixed to the outer periphery of the sliding plate to the upper sliding surface 11.
In the following description, a virtual axis that passes through the center of the upper sliding surface 11 in a plan view and extends in the vertical direction is referred to as the axis of the upper shoe 10. In a plan view, the axis of the upper shoe 10 coincides with the center of gravity of the outer shape of the upper shoe 10. In addition, in a plan view, a direction that intersects with the axis of the upper shoe 10 is referred to as the radial direction, and a direction that goes around the axis of the upper shoe 10 is referred to as the circumferential direction.

As shown in Figures 2 and 3, upper fastening parts 14 are provided at each of the four corners of the upper shoe 10, which are fastened to the upper structure U by fastening members F. The upper fastening parts 14 are provided with upper mounting holes 14a (mounting holes) for attaching the fastening members F. The upper mounting holes 14a penetrate the upper shoe 10 in the plate thickness direction of the upper shoe 10.

The upper fastening portion 14 is formed with an upper recess 15 (recess) that forms a working space S for attaching the fastening member F. The upper recess 15 is formed so as to be recessed upward from the lower surface of the upper shoe 10. The upper recess 15 is formed so as to be recessed from the side surface 10a of the upper shoe 10. In the illustrated example, the upper recess 15 is triangular in plan view. Note that the shape of the upper recess 15 is not limited to a triangle, and may be, for example, a trapezoid or rectangular shape in plan view. For example, the upper recess 15 is formed by cutting. Note that the upper recess 15 may be provided by joining a rectangular plate in plan view and an octagonal plate in plan view to form the upper shoe 10.

The lower shoe 20 is disposed on the upper part of the lower structure L. The lower shoe 20 is fixed to the lower structure L by fastening members F such as bolts so that it cannot move relative to the lower structure L. The lower shoe 20 is a rectangular plate material in a plan view. The lower shoe 20 is formed from rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C) or the like.

The upper surface of the lower shoe 20 is provided with a lower sliding surface 21, which is a concave spherical surface. The lower sliding surface 21 is formed in a circular shape in a plan view. A stainless steel sliding plate (not shown) is fixed to the lower sliding surface 21. In addition, a lower stopper ring 22, which is annular in a plan view, is fixed to the outer periphery of the sliding plate to the lower sliding surface 21.
In the following description, a virtual axis that passes through the center of the lower sliding surface 21 in a plan view and extends in the vertical direction is referred to as the axis of the lower shoe 20. The axis of the lower shoe 20 coincides with the center of gravity of the outer shape of the lower shoe 20 in a plan view.

The lower fastening portion 24 is provided at each of the four corners of the lower shoe 20, which is fastened to the lower structure L by a fastening member F. The lower fastening portion 24 is provided with a lower mounting hole 24a (mounting hole) for attaching the fastening member F. The lower mounting hole 24a penetrates the lower shoe 20 in the plate thickness direction of the lower shoe 20.

The lower fastening portion 24 is formed with a lower recess 25 (recess) that forms a working space S for attaching the fastening member F. The lower recess 25 is formed so as to be recessed downward from the upper surface of the lower shoe 20. The lower recess 25 is formed so as to be recessed from the side surface 20a of the lower shoe 20. In the illustrated example, the lower recess 25 is triangular in plan view. Note that the shape of the lower recess 25 is not limited to a triangle, and may be, for example, a trapezoid or rectangular shape in plan view. For example, the lower recess 25 is formed by cutting. Note that the lower recess 25 may be provided by joining a plate that is rectangular in plan view and a plate that is octagonal in plan view to form the lower shoe 20.

In this embodiment, the upper shoe 10 and the lower shoe 20 have the same shape. That is, in a plan view, the outer shapes of the upper shoe 10 and the lower shoe 20 are the same. The upper sliding surface 11 and the lower sliding surface 21 are the same shape. The upper recessed portion 15 and the lower recessed portion 25 are the same shape. More specifically, the upper recessed portion 15 and the lower recessed portion 25 are the same shape in a plan view. The length in the plate thickness direction of the upper recessed portion 15 in the upper shoe 10 (recess depth of the upper recessed portion 15) is the same as the length in the plate thickness direction of the lower recessed portion 25 in the lower shoe 20 (recess depth of the lower recessed portion 25).

The slider 30 is disposed between the upper shoe 10 and the lower shoe 20. The slider 30 has a generally cylindrical shape. The slider 30 has an upper sliding surface 31 and a lower sliding surface 32, which are convex spherical surfaces. The slider 30 is formed from rolled steel material for welding steel material (SM490A, B, C, or SN490B, C, or S45C), stainless steel material (SUS304, SUS316), or the like. The slider 30 has a load-bearing strength of about 60 N/mm ² (60 MPa) of surface pressure.

The upper sliding surface 31 is in sliding contact with the upper sliding surface 11, and the lower sliding surface 32 is in sliding contact with the lower sliding surface 21. In order to facilitate sliding of the slider 30 against the upper shoe 10 and the lower shoe 20, for example, a friction material is provided on the upper sliding surface 31 and the lower sliding surface 32. The friction material is, for example, a friction material made of at least PTFE. The friction material is formed of a double weave. The double weave is formed of PTFE fiber (polytetrafluoroethylene) and a fiber (high strength fiber) having a higher tensile strength than PTFE fiber. Here, examples of "fibers having a higher tensile strength than PTFE fiber" include polyamides such as nylon 6.6, nylon 6, and nylon 4.6, polyesters such as polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, and fibers such as para-aramid. In addition, examples of "fibers with higher tensile strength than PTFE fibers" include fibers such as meta-aramid, polyethylene, polypropylene, glass, carbon, polyphenylene sulfide (PPS), LCP, polyimide, and PEEK. Furthermore, examples of "fibers with higher tensile strength than PTFE fibers" may include heat-sealed fibers, cotton, wool, and other fibers. Among these, PPS fibers, which have excellent chemical resistance and hydrolysis resistance and extremely high tensile strength, are preferable. In addition, the friction material made of at least PTFE may be a fabric containing PTFE fibers other than a double weave, or may be a friction material made only of PTFE, a friction material made of a composite material of PTFE and other resins, or a friction material having a laminated structure of a friction material made of PTFE and a friction material made of other resins.

The slider 30 slides between the upper shoe 10 and the lower shoe 20, allowing the upper shoe 10 and the lower shoe 20 to move relative to each other in the horizontal direction. As a result, when vibrations of the lower structure L caused by seismic motion are transmitted to the lower shoe 20, the lower shoe 20 moves relative to the upper shoe 10. This movement prevents vibrations of the lower structure L caused by seismic motion from being transmitted to the upper structure U via the upper shoe 10.

Next, the relative positions of the upper shoe 10 and the lower shoe 20 will be explained. As mentioned above, when an earthquake motion occurs, the upper shoe 10 and the lower shoe 20 move relative to each other in the horizontal direction. In the following explanation, unless otherwise specified, the relative positions of the upper shoe 10 and the lower shoe 20 in the initial state, in which the upper shoe 10 and the lower shoe 20 do not move relative to each other in the horizontal direction, will be explained. The relative positions of the upper shoe 10 and the lower shoe 20 in the initial state are the relative positions of the upper shoe 10 and the lower shoe 20 when the sliding bearing 1 is attached to the upper structure U and the lower structure L.

In an initial state, the upper shoe 10 and the lower shoe 20 are arranged so that the axis of the upper shoe 10 and the axis of the lower shoe 20 coincide. The upper shoe 10 and the lower shoe 20 are arranged so that the orientations of the upper shoe 10 and the lower shoe 20 coincide when viewed from above. In other words, the upper shoe 10 and the lower shoe 20 are arranged so that the corners of the upper shoe 10 and the corners of the lower shoe 20 overlap each other when viewed from above. The circumferential positions of the corners of the upper shoe 10 and the corners of the lower shoe 20 coincide with each other.
The upper fastening portion 14 (upper recessed portion 15) and the lower fastening portion 24 (lower recessed portion 25) are arranged so that their radially overlapping regions. The upper fastening portion 14 (upper recessed portion 15) and the lower fastening portion 24 (lower recessed portion 25) are arranged so that they overlap each other in a plan view.

As described above, the sliding bearing 1 according to this embodiment includes an upper shoe 10 that is fixed to an upper structure U by a fastening member F, and a lower shoe 20 that is fixed to a lower structure L by a fastening member F. At least one of the upper shoe 10 and the lower shoe 20 has recessed portions 15, 25 that form a working space S for attaching the fastening member F and are recessed from the side surfaces 10a, 20a.

By forming the recessed portions 15, 25 in at least one of the upper shoe 10 and the lower shoe 20, a working space S for attaching the fastening member F can be secured. Generally, when a working space for attaching the fastening member cannot be secured between the lower structure and the lower surface of the upper shoe, or between the upper structure and the upper surface of the lower shoe, a box cutout portion can be formed in the lower structure to secure the space. In the sliding bearing 1 according to this embodiment, the recessed portions 15, 25 are formed as described above to secure the working space S for attaching the fastening member F, so that the depth of the box cutout portion can be reduced or the box cutout portion can be made unnecessary.

Furthermore, the upper shoe 10 and the lower shoe 20 are polygonal in plan view, and the positions of the corners of the upper shoe 10 in the circumferential direction coincide with the positions of the corners of the lower shoe 20 in the circumferential direction.
As a result, by forming the recesses 15, 25, the working space S can be secured while the area occupied by the sliding bearing 1 in a plan view can be reduced.

In addition, the sliding bearing 1 is an intermediate-story seismic isolation structure arranged in the intermediate stories of a building.
In the mid-story seismic isolation, it is necessary to provide a fire-resistant coating for the sliding bearing 1. Since the area occupied by the sliding bearing 1 in a plan view can be reduced, the area of the fire-resistant coating can be reduced.

Moreover, the upper shoe 10 and the lower shoe 20 have the same shape.
This allows the plate member of both the upper shoe 10 and the lower shoe 20 to be used in common.

The upper shoe 10 and the lower shoe 20 are arranged so that their central axes coincide with each other. The upper shoe 10 has an upper fastening portion 14 that is fixed to the upper structure U by a fastening member F, and the lower shoe 20 has a lower fastening portion 24 that is fixed to the lower structure L by a fastening member F. The upper fastening portion 14 and the lower fastening portion 24 overlap in their radial existence areas.
This makes it possible to reduce the area occupied by the sliding bearing 1 in a plan view.

In addition, in plan view, the outer shapes of the upper shoe 10 and the lower shoe 20 are the same, and the plan view areas of the upper fastening portion 14 and the lower fastening portion 24 coincide.
This allows the space to be used both as a work space for fixing the upper fastening portion 14 to the upper structure U and as a work space for fixing the lower fastening portion 24 to the lower structure L.

The recesses 15 and 25 are formed by cutting.
This makes it easier to form the shape of the upper shoe 10 and/or the lower shoe 20 compared to, for example, a case in which a recess is formed by joining multiple plates by welding or the like.

Further, the lower surface of the upper shoe 10 has an upper sliding surface 11, and the upper surface of the lower shoe 20 has a lower sliding surface 21. At least one of the upper sliding surface 11 and the lower sliding surface 21 is a concave spherical surface.
This allows the vertical size of the sliding bearing 1 to be reduced. Also, compared to a planar sliding bearing in which the sliding surfaces of the upper shoe 10 and the lower shoe 20 are flat, the range of horizontal movement of the lower shoe 20 relative to the upper shoe 10 when vibration of the lower structure L due to earthquake motion is transmitted to the lower shoe 20 can be restricted, making it easier to avoid interference with other structures. Note that when the vertical size of the sliding bearing 1 is reduced, the gap between the lower structure L and the lower surface of the upper shoe 10 and the gap between the upper structure U and the upper surface of the lower shoe 20 become smaller, but since the recesses 15, 25 are formed in at least one of the upper shoe 10 and the lower shoe 20, a working space S for the installation work of the fastening member F to the upper shoe 10 and the lower shoe 20 can be secured.

In addition, both the upper sliding surface 11 and the lower sliding surface 21 are concave spherical surfaces.
As a result, since both the upper slide surface 11 and the lower slide surface 21 are concave spherical surfaces, the device plane required to ensure the amount of deformation can be made smaller than when either one of the upper slide surface or the lower slide surface is a concave spherical surface.

Furthermore, the upper slide surface 11 and the lower slide surface 21 have the same shape.
As a result, the upper sliding surface 11 formed on the upper shoe 10 and the lower sliding surface 21 formed on the lower shoe 20 are not restricted by the shape of each other, so that the areas of the upper sliding surface 11 and the lower sliding surface 21 can be sufficiently secured. Also, the manufacturing efficiency of the upper shoe 10 and the lower shoe 20 can be improved.

Moreover, the seismic isolation structure 100 according to this embodiment includes a sliding bearing 1, an upper structure U, and a lower structure L. The sliding bearing 1 is an intermediate layer seismic isolation disposed between the upper structure U as the upper layer of the building and the lower structure L as the lower layer of the building.
This makes it possible to reduce the area occupied by the sliding bearing 1 in a plan view, thereby improving the degree of freedom in designing the seismic isolation structure 100. Furthermore, in mid-story seismic isolation, it is necessary to provide a fire-resistant coating for the sliding bearing 1. Since the area occupied by the sliding bearing 1 in a plan view can be reduced, the area of the fire-resistant coating can be reduced.

Second Embodiment
Next, a sliding bearing 2 according to a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and only the differences will be described.

In this embodiment, the upper shoe 10 and the lower shoe 20 are arranged so that the upper shoe 10 and the lower shoe 20 have different planar postures. For example, from a state in which the upper shoe 10 and the lower shoe 20 overlap in a planar view, the upper shoe 10 is rotated 45 degrees in the circumferential direction relative to the lower shoe 20. That is, the upper shoe 10 and the lower shoe 20 are arranged so that the corners of the upper shoe 10 and the corners of the lower shoe 20 do not overlap each other in a planar view. The circumferential positions of the corners of the upper shoe 10 and the corners of the lower shoe 20 are different. In this case, the upper fastening portion 14 (upper recessed portion 15) and the lower fastening portion 24 (lower recessed portion 25) are arranged so that they do not overlap each other in a planar view.

As described above, in the sliding bearing 2 of this embodiment, the upper shoe 10 and the lower shoe 20 are polygonal in plan view, and the position of the corners of the upper shoe 10 in the circumferential direction is different from the position of the corners of the lower shoe 20 in the circumferential direction.
This makes it possible to more reliably secure the working space S for the attachment work of the fastening members F to the upper shoe 10 and the lower shoe 20.

Third Embodiment
Next, a sliding bearing 3 according to a third embodiment of the present invention will be described with reference to FIGS.
In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and only the differences will be described.

In this embodiment, the upper shoe 10 and the lower shoe 20 are cylindrical. That is, the upper shoe 10 and the lower shoe 20 are circular in plan view.

The upper shoe 10 has a plurality of upper fastening portions 17 on its outer periphery, which are fastened to the upper structure U by fastening members F. For example, the upper fastening portions 17 are arranged at equal intervals in the circumferential direction. The upper fastening portions 17 have upper mounting holes 17a (mounting holes) for mounting the fastening members F. The upper mounting holes 17a penetrate the upper shoe 10 in the thickness direction of the upper shoe 10.

The upper fastening portion 17 is formed with an upper recess 18 (recess) that forms a working space S for attaching the fastening member F. The upper recess 18 is formed so as to be recessed upward from the underside of the upper shoe 10. The upper recess 18 is formed so as to be recessed from the side surface 10a of the upper shoe 10. For example, the upper recess 18 is formed by cutting. In the illustrated example, the upper recess 18 is substantially rectangular in plan view. The shape of the upper recess 18 is not limited to this.

The lower shoe 20 has a plurality of lower fastening portions 27 on its outer periphery, which are fastened to the lower structure L by fastening members F. For example, the plurality of lower fastening portions 27 are arranged at equal intervals in the circumferential direction. The lower fastening portions 27 have lower mounting holes 27a (mounting holes) for mounting the fastening members F. The lower mounting holes 27a penetrate the lower shoe 20 in the thickness direction of the lower shoe 20.

The lower fastening portion 27 is formed with a lower recess 28 (recess) that forms a working space S for attaching the fastening member F. The lower recess 28 is formed so as to be recessed downward from the upper surface of the lower shoe 20. The lower recess 28 is formed so as to be recessed from the side surface 20a of the lower shoe 20. For example, the lower recess 28 is formed by cutting. In the illustrated example, the lower recess 28 is substantially rectangular in plan view. The shape of the lower recess 28 is not limited to this.

In this embodiment, the upper shoe 10 and the lower shoe 20 have the same shape. That is, in a plan view, the outer shapes of the upper shoe 10 and the lower shoe 20 are the same. The upper sliding surface 11 and the lower sliding surface 21 have the same shape. The upper recessed portion 18 and the lower recessed portion 28 have the same shape. Note that the upper shoe 10 and the lower shoe 20 may be different in size. That is, the upper shoe 10 and the lower shoe 20 may be different in diameter.

In the initial state, the upper shoe 10 and the lower shoe 20 are positioned so that the axis of the upper shoe 10 coincides with the axis of the lower shoe 20. The upper fastening portion 17 (upper recessed portion 18) and the lower fastening portion 27 (lower recessed portion 28) are positioned so that their radial presence areas overlap. The upper fastening portion 17 (upper recessed portion 18) and the lower fastening portion 27 (lower recessed portion 28) are positioned so that they overlap each other in a plan view.

As described above, in the sliding bearing 3 according to this embodiment, the upper shoe 10 and the lower shoe 20 have a cylindrical shape.
This makes it possible to ensure working space S while reducing the area occupied by the sliding bearing 3 in a plan view.

Fourth Embodiment
Next, a seismic isolation structure 300 according to a fourth embodiment of the present invention will be described with reference to FIGS.
The seismic isolation structure of this embodiment comprises, in addition to the upper structure U, the lower structure L, and the sliding bearing 1, a second upper structure U1, a second lower structure L1, and a second sliding bearing 6 shown in Figure 10.

As shown in FIG. 13, in the seismic isolation structure 300, the sliding bearing 1 is used for mid-story seismic isolation. More specifically, the sliding bearing 1 is used for column head seismic isolation, and the substructure L is the column head of the column. In addition, a first fire-resistant covering material 301 is provided around the sliding bearing 1. The first fire-resistant covering material 301 is provided so as to cover the sliding bearing 1. Note that the configuration of the sliding bearing 1 is the same as that of the sliding bearing 1 in the first embodiment, so a description thereof will be omitted here.

In the seismic isolation structure 300, the second sliding bearing 6 is used for base isolation. Specifically, the second upper structure U1 and the second lower structure L1 face each other in the vertical direction. The second sliding bearing 6 is disposed between the second upper structure U1 and the second lower structure L1. When an earthquake motion occurs, the second sliding bearing 6 displaces the second upper structure U1 and the second lower structure L1 relative to each other in the horizontal direction. This suppresses the transmission of vibration of the second lower structure L1 to the second upper structure U1. For example, the second upper structure U1 is a building, and the second lower structure L1 is a foundation structure installed on the ground. In the illustrated example, the second lower structure L1 is a footing. In addition, a second fire-resistant covering material 302 is provided around the second sliding bearing 6. The second fire-resistant covering material 302 is provided so as to cover the second sliding bearing 6.

In the illustrated example, in the seismic isolation structure 300, the lower structure L and the second lower structure L1 are integrally formed. However, the lower structure L and the second lower structure L1 may be formed so as to be movable relative to each other.

The second sliding bearing 6 has a second upper shoe 60, a second lower shoe 70, and a second slider 80 that slides between the second upper shoe 60 and the second lower shoe 70.

The second upper shoe 60 is disposed under the second upper structure U1. The second upper shoe 60 is fixed to the second upper structure U1 by fastening members F such as bolts so that it cannot move relative to the second upper structure U1. The second upper shoe 60 is an octagonal plate material in a plan view. The second upper shoe 60 is formed from rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C), etc.

The lower surface of the second upper shoe 60 is provided with a second upper sliding surface 61, which is a concave spherical surface. The second upper sliding surface 61 is formed in a circular shape in a plan view. A stainless steel sliding plate (not shown) is fixed to the second upper sliding surface 61. In addition, a second upper stopper ring 62, which is annular in a plan view, is fixed to the outer periphery of the sliding plate to the second upper sliding surface 61.
In the following description, a virtual axis that passes through the center of the second upper sliding surface 61 in a plan view and extends in the vertical direction is referred to as the axis of the second upper shoe 60. The axis of the second upper shoe 60 coincides with the center of gravity of the outer shape of the second upper shoe 60 in a plan view.

The second lower shoe 70 is disposed on the upper part of the second lower structure L1. The second lower shoe 70 is fixed to the second lower structure L1 by fastening members F such as bolts so that they cannot move relative to each other. The second lower shoe 70 is an octagonal plate material in a plan view. The second lower shoe 70 is formed from rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C) or the like. In this embodiment, the second upper shoe 60 and the second lower shoe 70 have the same shape.

The upper surface of the second lower shoe 70 is provided with a second lower sliding surface 71, which is a concave spherical surface. The second lower sliding surface 71 is formed in a circular shape in a plan view. A stainless steel sliding plate (not shown) is fixed to the second lower sliding surface 71. In addition, a second lower stopper ring 72, which is annular in a plan view, is fixed to the outer periphery of the sliding plate to fix the sliding plate to the second lower sliding surface 71.
In the following description, a virtual axis that passes through the center of the second lower sliding surface 71 in a plan view and extends in the vertical direction is referred to as the axis of the second lower shoe 70. The axis of the second lower shoe 70 coincides with the center of gravity of the outer shape of the second lower shoe 70 in a plan view.

The second slider 80 is disposed between the second upper shoe 60 and the second lower shoe 70. The second slider 80 has a substantially cylindrical shape. The second slider 80 has a second upper sliding surface 81 and a second lower sliding surface 82, which are convex spherical surfaces. The second slider 80 is formed from a rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C), or a stainless steel material (SUS304, SUS316). The second slider 80 has a load-bearing strength of about 60 N/mm ² (60 MPa) of surface pressure.

The second upper sliding surface 81 is in sliding contact with the second upper sliding surface 61, and the second lower sliding surface 82 is in sliding contact with the second lower sliding surface 71. To facilitate sliding of the second slider 80 against the second upper shoe 60 and the second lower shoe 70, the second upper sliding surface 81 and the second lower sliding surface 82 are provided with, for example, a friction material.

The second slider 80 slides between the second upper shoe 60 and the second lower shoe 70, allowing the second upper shoe 60 and the second lower shoe 70 to move relative to each other in the horizontal direction. As a result, when vibration of the second lower structure L1 caused by seismic motion is transmitted to the second lower shoe 70, the second lower shoe 70 moves relative to the second upper shoe 60. This movement prevents vibration of the second lower structure L1 caused by seismic motion from being transmitted to the second upper structure U1 via the second upper shoe 60.

Next, the relative positions of the second upper shoe 60 and the second lower shoe 70 will be described. As described above, when an earthquake motion occurs, the second upper shoe 60 and the second lower shoe 70 move relative to each other in the horizontal direction. In the following explanation, unless otherwise specified, the relative positions of the second upper shoe 60 and the second lower shoe 70 in the initial state in which the second upper shoe 60 and the second lower shoe 70 are not moving relative to each other in the horizontal direction will be described.

In the initial state, the second upper shoe 60 and the second lower shoe 70 are arranged so that the axis of the second upper shoe 60 and the axis of the second lower shoe 70 coincide with each other. The second upper shoe 60 and the second lower shoe 70 are arranged so that the second upper shoe 60 and the second lower shoe 70 have different orientations in a plan view. As a result, the second upper shoe 60 and the second lower shoe 70 have areas that do not overlap each other in a plan view.

The second upper shoe 60 has an upper protruding portion 64 (protruding portion) that does not overlap with the second lower shoe 70 in a plan view. The upper protruding portion 64 is provided with a second upper mounting hole 64a (second mounting hole) for mounting a fastening member F. The second upper mounting hole 64a penetrates the second upper shoe 60 in the plate thickness direction of the second upper shoe 60. The upper protruding portion 64 has an upper flat protruding portion 65 (flat protruding portion) that is trapezoidal in a plan view. In this embodiment, the entire upper protruding portion 64 is the upper flat protruding portion 65.

The second lower shoe 70 has a lower protruding portion 74 (protruding portion) that does not overlap with the second upper shoe 60 in a plan view. In this embodiment, the lower protruding portion 74 has the same shape and size as the upper protruding portion 64. The lower protruding portion 74 is provided with a second lower mounting hole 74a (second mounting hole) for mounting a fastening member F. The second lower mounting hole 74a penetrates the second lower shoe 70 in the plate thickness direction of the second lower shoe 70. The lower protruding portion 74 has a lower flat protruding portion 75 (flat protruding portion) that is trapezoidal in a plan view. In this embodiment, the entire lower protruding portion 74 is the lower flat protruding portion 75.

As described above, the seismic isolation structure according to this embodiment further includes, in addition to the upper structure U, the lower structure L, and the sliding bearing 1, the second upper structure U1, the second lower structure L1 facing the second upper structure U1, and the second sliding bearing 6 disposed between the second upper structure U1 and the second lower structure L1. The second sliding bearing 6 includes a second upper shoe 60 fixed to the second upper structure U1 by a fastening member F, and a second lower shoe 70 fixed to the second lower structure L1 by a fastening member F. The second upper shoe 60 and the second lower shoe 70 have protruding portions 64, 74 that do not overlap each other in a plan view. The protruding portions 64, 74 are formed with second mounting holes 64a, 74a for mounting the fastening member F. The protruding portions 64, 74 include flat protruding portions 65, 75 that are trapezoidal in a plan view. The second sliding bearing 6 is a base isolation structure fixed to the second lower structure L1 as a foundation structure.
As a result, the protruding portions 64, 74 are fixed to the second upper structure U1 and the second lower structure L1 using the fastening members F. By having the protruding portions 64, 74 as flat protruding portions 65, 75 that are trapezoidal in plan view, the amount of outward protrusion of the protruding portions 64, 74 can be reduced, and the area occupied by the second sliding bearing 6 in plan view can be reduced. Furthermore, since the area occupied by the second sliding bearing in plan view can be reduced, the freedom in designing the seismic isolation structure is improved.

In addition, since the area occupied by the sliding bearing 1 in a plan view can be reduced, the installation area of the first fire-resistant covering material 301 that is provided to cover the sliding bearing 1 can be reduced. As shown in FIG. 13, when the first fire-resistant covering material 301 is placed below the ceiling, the installation area of the first fire-resistant covering material 301 can be reduced, so that the deterioration of the appearance due to the installation of the first fire-resistant covering material 301 can be suppressed.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications are possible within the technical scope.

For example, in the above embodiment, the recesses 15, 25 are formed in the upper shoe 10 and the lower shoe 20. However, the present invention is not limited to this, and the recesses may be formed in only one of the upper shoe 10 and the lower shoe 20. In this case, processing of the other of the upper shoe 10 and the lower shoe 20 can be omitted.

In addition, the sliding bearings 1, 2, and 3 in the above embodiment are so-called double pendulum type sliding bearings in which the upper sliding surface 11, which is a concave spherical surface, is provided on the lower surface of the upper shoe 10, and the lower sliding surface 21, which is a concave spherical surface, is provided on the upper surface of the lower shoe 20, and the sliding surfaces slide at two points between the upper sliding surface 11 and the upper sliding surface 31, and between the lower sliding surface 21 and the lower sliding surface 32. However, the present invention is not limited to this, and may be a so-called single pendulum type sliding bearing in which the upper sliding surface 11 is provided only on the upper shoe 10 and the sliding surface slides at one point between the upper sliding surface 11 and the upper sliding surface 31, or the lower sliding surface 21 is provided only on the lower shoe 20 and the sliding surface slides at one point between the lower sliding surface 21 and the lower sliding surface 32. Alternatively, the sliding bearing may be a so-called flat sliding bearing in which the upper sliding surface 11 of the upper shoe 10 and the lower sliding surface 21 of the lower shoe 20 are flat surfaces. One of the upper sliding surface 11 of the upper shoe 10 and the lower sliding surface 21 of the lower shoe 20 may be a concave spherical surface, and the other may be a flat surface.

In addition, in the seismic isolation structure according to the fourth embodiment, the sliding bearing 3 according to the third embodiment may be used instead of the sliding bearing 1 according to the first embodiment.

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

Various aspects of this disclosure are summarized below as appendices.

(Appendix 1)
A sliding bearing disposed between an upper structure and a lower structure facing the upper structure,
An upper shoe fixed to the upper structure by a fastening member;
A lower shoe fixed to the lower structure by a fastening member,
A sliding support, wherein a recessed portion that forms a working space for attaching the fastening member is formed in at least one of the upper shoe and the lower shoe so as to recess from a side surface.

(Appendix 2)
The upper shoe and the lower shoe are polygonal in plan view, and the position of a corner of the upper shoe in a circumferential direction about an axis of the upper shoe in plan view coincides with the position of a corner of the lower shoe in the circumferential direction.
2. A sliding bearing as described in appendix 1.

(Appendix 3)
The sliding bearing is an intermediate layer seismic isolation structure arranged in the intermediate layer of a building.
Attachment 2: A sliding bearing.

(Appendix 4)
The upper shoe and the lower shoe are polygonal in plan view, and a position of a corner of the upper shoe in a circumferential direction about an axis of the upper shoe in plan view is different from a position of a corner of the lower shoe in the circumferential direction.
2. A sliding bearing as described in appendix 1.

(Appendix 5)
The upper shoe and the lower shoe have the same shape.
5. A sliding bearing according to any one of claims 1 to 4.

(Appendix 6)
The recessed portion is formed in only one of the upper shoe and the lower shoe.
6. A sliding bearing according to any one of claims 1 to 5.

(Appendix 7)
The upper shoe and the lower shoe are arranged so that their axes coincide with each other,
The upper shoe has an upper fastening portion that is fixed to the upper structure by the fastening member,
The lower shoe has a lower fastening portion that is fixed to the lower structure by the fastening member,
The upper fastening portion and the lower fastening portion overlap in their existing regions in a radial direction perpendicular to the axis.
7. A sliding bearing according to any one of claims 1 to 6.

(Appendix 8)
In a plan view, the outer shapes of the upper shoe and the lower shoe are the same,
The upper fastening portion and the lower fastening portion have the same planar view area.
8. A sliding bearing as described in appendix 7.

(Appendix 9)
The upper shoe and the lower shoe are cylindrical in shape.
2. A sliding bearing as described in appendix 1.

(Appendix 10)
The recessed portion is machined.
10. A sliding bearing according to any one of claims 1 to 9.

(Appendix 11)
The lower surface of the upper shoe has an upper sliding surface,
The upper surface of the lower shoe has a lower sliding surface,
At least one of the upper sliding surface and the lower sliding surface is a concave spherical surface.
11. A sliding bearing according to any one of claims 1 to 10.

(Appendix 12)
Both the upper sliding surface and the lower sliding surface are concave spherical surfaces.
12. The sliding bearing according to claim 11.

(Appendix 13)
The upper sliding surface and the lower sliding surface have the same shape.
13. The sliding bearing according to claim 12.

(Appendix 14)
A sliding bearing as described in Appendix 2;
The upper structure;
The lower structure;
Equipped with
The sliding bearing is an intermediate layer seismic isolation disposed between the upper structure as the upper layer of the building and the lower structure as the lower layer of the building.
Earthquake-resistant structure.

(Appendix 15)
A second upper structure; and
a second lower structure facing the second upper structure;
a second sliding bearing disposed between the second upper structure and the second lower structure;
Further equipped with
The second sliding bearing is
a second upper shoe fixed to the second upper structure by a fastening member;
a second lower shoe fixed to the second lower structure by a fastening member;
Equipped with
The second upper shoe and the second lower shoe have protruding portions that do not overlap with each other in a plan view,
A second mounting hole for mounting the fastening member is formed in the protruding portion,
The protruding portion has a flat protruding portion that is trapezoidal in a plan view,
The second sliding bearing is a base isolation structure fixed to the second substructure as a foundation structure.
15. The seismic isolation structure according to claim 14.

1, 2, 3 Sliding bearing 6 Second sliding bearing 10 Upper shoe 14, 17 Upper fastening portion 14a, 17a Upper mounting hole (mounting hole)
15, 18 Upper recessed portion (recessed portion)
20 Lower shoe 24, 27 Lower fastening portion 24a, 27a Lower mounting hole (mounting hole)
25, 28 Lower recessed portion (recessed portion)
30 Slider 60 Second upper shoe 64 Upper protruding portion (protruding portion)
64a: Second upper mounting hole (second mounting hole)
65 Upper flat protruding part (flat protruding part)
70 Second lower shoe 74 Lower protruding portion (protruding portion)
74a: Second lower mounting hole (second mounting hole)
75 Lower flat protruding part (flat protruding part)
80 Second slider 100 Seismic isolation structure L Lower structure L1 Second lower structure U Upper structure U1 Second upper structure

Claims (15)

A sliding bearing disposed between an upper structure and a lower structure facing the upper structure,
An upper shoe fixed to the upper structure by a fastening member;
A lower shoe fixed to the lower structure by a fastening member,
At least one of the upper shoe and the lower shoe has a recessed portion recessed from a side surface thereof to form a working space for attaching the fastening member,
A sliding support , wherein the recessed portions are formed in a plurality of locations on the side surface and dispersed in a circumferential direction around the axis of the upper shoe . The upper shoe and the lower shoe are polygonal in plan view, and the position of a corner of the upper shoe in a circumferential direction about an axis of the upper shoe in plan view coincides with the position of a corner of the lower shoe in the circumferential direction.
2. A sliding bearing according to claim 1. The sliding bearing is an intermediate layer seismic isolation structure arranged in the intermediate layer of a building.
A sliding bearing according to claim 2. The upper shoe and the lower shoe are polygonal in plan view, and a position of a corner of the upper shoe in a circumferential direction about an axis of the upper shoe in plan view is different from a position of a corner of the lower shoe in the circumferential direction.
2. A sliding bearing according to claim 1. The upper shoe and the lower shoe have the same shape.
2. A sliding bearing according to claim 1. The recessed portion is formed in only one of the upper shoe and the lower shoe.
2. A sliding bearing according to claim 1. The upper shoe and the lower shoe are arranged so that their axes coincide with each other,
The upper shoe has an upper fastening portion that is fixed to the upper structure by the fastening member,
The lower shoe has a lower fastening portion that is fixed to the lower structure by the fastening member,
The upper fastening portion and the lower fastening portion overlap in their existing regions in a radial direction perpendicular to the axis.
2. A sliding bearing according to claim 1. In a plan view, the outer shapes of the upper shoe and the lower shoe are the same,
The upper fastening portion and the lower fastening portion have the same planar view area.
A sliding bearing according to claim 7. The upper shoe and the lower shoe are cylindrical in shape.
2. A sliding bearing according to claim 1. The recessed portion is machined.
2. A sliding bearing according to claim 1. The lower surface of the upper shoe has an upper sliding surface,
The upper surface of the lower shoe has a lower sliding surface,
At least one of the upper sliding surface and the lower sliding surface is a concave spherical surface.
2. A sliding bearing according to claim 1. Both the upper sliding surface and the lower sliding surface are concave spherical surfaces.
A sliding bearing according to claim 11. The upper sliding surface and the lower sliding surface have the same shape.
A sliding bearing according to claim 12. A sliding bearing according to claim 2;
The upper structure;
The lower structure;
Equipped with
The sliding bearing is an intermediate layer seismic isolation disposed between the upper structure as the upper layer of the building and the lower structure as the lower layer of the building.
Earthquake-resistant structure. A second upper structure; and
a second lower structure facing the second upper structure;
a second sliding bearing disposed between the second upper structure and the second lower structure;
Further equipped with
The second sliding bearing is
a second upper shoe fixed to the second upper structure by a fastening member;
a second lower shoe fixed to the second lower structure by a fastening member;
Equipped with
The second upper shoe and the second lower shoe have protruding portions that do not overlap with each other in a plan view,
A second mounting hole for mounting the fastening member is formed in the protruding portion,
The protruding portion has a flat protruding portion that is trapezoidal in a plan view,
The second sliding bearing is a base isolation structure fixed to the second lower structure as a foundation structure.
The seismic isolation structure according to claim 14.

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