Sliding bearing

Abstract

To provide a sliding bearing capable of self-resetting and having high maintenance performance.SOLUTION: A sliding bearing disposed between an upper structure H and a lower structure L facing the upper structure H includes an upper shoe 10 fixed to the upper structure H, a lower shoe 27 fixed to the lower structure L, and a support 40 disposed between the upper shoe 10 and the lower shoe 27 and relatively movable in a horizontal direction with respect to both the upper shoe 10 and the lower shoe 27, in which the upper shoe 10 includes a spherical first concave spherical surface 17, and the lower shoe 27 includes a spherical second concave spherical surface 34.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to sliding bearings. [Background technology]

[0002] In Japan, a country prone to earthquakes, various earthquake-resistant, seismic isolation, and vibration control technologies have been developed and applied to a variety of structures, including buildings, bridges, elevated roads, and detached homes, to resist seismic forces and reduce the seismic forces acting on structures. Seismic isolation, in particular, effectively reduces the vibration of a structure during an earthquake by reducing the seismic forces acting on the structure itself. This technology, in general, involves placing a seismic isolation device between the foundation (the substructure) and the superstructure. This reduces the transmission of earthquake-induced vibrations from the foundation to the superstructure, thereby reducing the vibration of the superstructure and ensuring structural stability. Furthermore, this seismic isolation device is effective not only during earthquakes, but also in reducing the impact of traffic vibrations, which act on structures at all times, on the superstructure.

[0003] There are various types of seismic isolation devices, including lead-plug laminated rubber bearing devices, high-damping laminated rubber bearing devices, devices that combine laminated rubber bearings with dampers, and sliding seismic isolation devices. Patent Document 1 discloses a sliding bearing device that has a configuration in which a sliding material is slidably arranged on the surface of a sliding plate, and is interposed between a structure and its supporting structure, thereby supporting the structure so that the structure can be displaced horizontally relative to the supporting structure while supporting the vertical load of the structure and providing a predetermined sliding resistance to the supporting structure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-225016 Summary of the Invention [Problem to be solved by the invention]

[0005] The sliding bearing device disclosed in Patent Document 1 is a planar sliding seismic isolation device in which the sliding plate is planar. However, the sliding bearings of planar sliding seismic isolation devices do not have a restoring force and cannot self-restore in the event of an earthquake. Therefore, after an earthquake, the sliding bearings must be manually returned to their pre-earthquake positions. In other words, planar sliding seismic isolation devices have issues with maintenance performance.

[0006] An object of the present disclosure is to provide a sliding bearing that is self-recoverable and has high maintenance performance. [Means for solving the problem]

[0007] The present disclosure has been made to solve the above problems, and proposes the following means. A sliding bearing according to one embodiment of the present disclosure is a sliding bearing arranged between an upper structure and a lower structure facing the upper structure, and is characterized by comprising an upper shoe fixed to the upper structure, a lower shoe fixed to the lower structure, and a support arranged between the upper shoe and the lower shoe and capable of moving horizontally relative to both the upper shoe and the lower shoe, wherein the upper shoe has a first spherical concave spherical surface, and the lower shoe has a second spherical concave spherical surface. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a sliding bearing that is self-recoverable and has high maintenance performance. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view of a sliding bearing according to an embodiment of the present disclosure. [Figure 2] FIG. [Figure 3] FIG. 4 is a schematic diagram showing the positional relationship between a flange and a support body. [Figure 4] 10A and 10B are diagrams showing the distribution of strains applied to the support body and the flange calculated by simulation. [Figure 5] FIG. 4 is a cross-sectional view showing the vicinity of a connecting bolt that engages with a nut. [Figure 6] 4 is a schematic diagram showing an example of the structure of a friction material that covers a first convex spherical surface. FIG. [Figure 7] FIG. 10 is a cross-sectional view of a sliding bearing according to a first modified example of the present disclosure, which is not provided with a retraction means. [Figure 8] FIG. 10 is an exploded perspective view of a sliding bearing according to a second modified example of the present disclosure, in which the fixing portion is provided with a plurality of second fixing members. [Figure 9] FIG. 10 is an exploded perspective view of a sliding bearing according to a third modified example of the present disclosure, in which the upper shoe does not have a fixing portion. DETAILED DESCRIPTION OF THE INVENTION

[0010] A sliding bearing 100 according to one embodiment of the present disclosure will now be described with reference to the drawings. As shown in FIG. 1, the sliding bearing 100 is a sliding bearing arranged between an upper structure H and a lower structure L facing the upper structure H. The upper structure H and the lower structure L each have a column made of reinforced concrete or steel, and a steel base plate disposed on the upper or lower surface of the column. FIG. 1 is a cross-sectional view of the sliding bearing 100 according to one embodiment of the present disclosure. The sliding bearing 100 includes an upper shoe 10, a retraction means 23, a lower shoe 27, and a support 40.

[0011] Hereinafter, the direction along the central axis of the upper shoe 10 will be referred to as the axial direction, and the direction intersecting the central axis in a plan view of the upper shoe 10 from the axial direction will be referred to as the radial direction. Also, the direction going around the central axis in the plan view will be referred to as the circumferential direction. The radially outer side and the radially inner side are defined as follows: In the plan view, the side that is farther away from the central axis in the radial direction is the radially outer side. In the plan view, the side that is closer to the central axis in the radial direction is the radially inner side.

[0012] The upper shoe 10 is fixed to the upper structure H. More specifically, the upper shoe 10 is fixed to a base plate of the upper structure H. The upper shoe 10 includes an upper shoe base 11, a first sliding plate 16, and a fixing portion 24. The upper shoe base 11 has a rectangular shape in a plan view and is made of rolled steel for welding steel (SM490A, B, C, or SN490B, C, or S45C), cast steel, cast iron, or the like. A concave curved surface 12 is formed on the upper shoe base 11. The concave curved surface 12 is concave spherical and has a circular shape in a plan view. The outer peripheral edge of the upper shoe base 11 is not concave spherical as shown in Figures 1 and 2, but has a constant thickness in the vertical direction (approximately the same thickness regardless of position). Figure 2 is an exploded perspective view of the sliding bearing 100 with the lower shoe 27 omitted.

[0013] Furthermore, the upper shoe base 11 is formed with a first recess 13, a second recess 14, and a third recess 15. More specifically, the first recess 13 is formed on the surface of the upper shoe base 11 on the side where a first sliding plate 16 (described later) is provided. The first recess 13 accommodates a nut 22 (described later) that is fixed in a protruding state on the back surface of the first sliding plate 16. More specifically, the second recess 14 is formed on the surface of the upper shoe base 11 opposite to the side where the first recess 13 is formed. The second recess 14 accommodates a connecting bolt 21, which will be described later. 2, the third recesses 15 are formed on the periphery of the upper shoe base 11. Fixing bolts 20 for fixing first fixing members 19, which will be described later, are inserted into the third recesses 15. The number of the first recesses 13, the second recesses 14, and the third recesses 15 formed in the upper shoe base 11 is not particularly limited.

[0014] The first sliding plate 16 is connected to the upper shoe base 11 by connecting bolts 21, which will be described later. Although the detailed configuration will be described later, as shown in FIG. 5 , the screw head of the connecting bolt 21 is positioned at the recessed bottom of the second recess 14, so that by tightening the connecting bolt 21 with the nut 22, the first sliding plate 16 is drawn to the upper shoe base 11 at multiple portions, and the first sliding plate 16 is pressed against the concave curved surface 12 of the upper shoe base 11. As a result, the first sliding plate 16 is fixed to the upper shoe base 11 in a shape that follows the shape of the concave curved surface 12 of the upper shoe base 11.

[0015] The first sliding plate 16 is a plate-like member having a certain thickness. The first sliding plate 16 has a circular shape in a plan view. The first sliding plate 16 is made of, for example, stainless steel (SUS material). The thickness of the first sliding plate is 1 mm or more. The plate material for the first sliding plate 16 is, for example, a plate material having a thickness of about 3 mm to 10 mm. The first sliding plate 16 is curved, for example, by pressing. Furthermore, the first sliding plate 16 is formed separately from the upper shoe base 11. Therefore, for example, when processing only the first sliding plate 16 and not the upper shoe base 11, the first sliding plate 16 does not have to be handled together with the heavy upper shoe base 11, making it easier to handle.

[0016] The first sliding plate 16 is formed with a first concave spherical surface 17 and a flange 18 . The first concave spherical surface 17 is spherical and has a circular shape in a plan view.

[0017] The flange 18 is formed in an annular shape so as to surround the outer peripheral edge of the first concave spherical surface 17. The flange 18 forms an annular step G in the radial direction with respect to the first concave spherical surface 17 on the first sliding plate 16. In this embodiment, as shown in FIG. 3 , the step G is formed due to the difference in plate thickness of the first sliding plate 16 between the flange 18 and the first concave spherical surface 17. As shown in FIG. 3( b), the step G prevents the support 40 from protruding radially outward from the upper shoe 10. FIG. 3 is a schematic diagram showing the positional relationship between the step G and the support 40 sliding radially along the first concave spherical surface 17. As will be described in detail later, the support 40 is horizontally movable relative to both the upper shoe 10 and the lower shoe 27. First, as shown in FIG. 3( a), when the support 40 is not moving radially outward relative to the upper shoe 10 (when the support 40 is in its initial position), the support 40 is positioned outside the illustration and is not close to the step G. On the other hand, as shown in FIG. 3( b), when the support 40 moves significantly radially relative to the first concave spherical surface 17 due to an earthquake or the like, the support 40 may come into contact with the step G. Here, the step G has an annular restricting surface that rises from the edge of the first concave spherical surface 17 of the first sliding plate 16 toward the side where the center of curvature of the first concave spherical surface 17 is located. Therefore, when the support body 40 moves radially outward relative to the upper shoe 10 and comes into contact with the step G, the step G restricts the support body 40 from moving further radially outward. Therefore, even if an earthquake of an unexpected scale that exceeds the scale anticipated at the design stage occurs, the support body 40 can be prevented from flying out radially outward from the upper shoe 10.

[0018] A simulation was performed to calculate the distribution of strain applied to the support body 40 and the step G in the case where the step G restricts the support body 40 from moving radially outward from the step G of the upper shoe 10. FIG. 4 shows the distribution of strain applied to the support body 40 and the step G, calculated by simulation. As shown in FIG. 4, it can be seen that by applying strain centered on the contact portion between the support body 40 and the step G, the flange 18 can restrict the support body 40 from moving further radially outward from the upper shoe 10.

[0019] Although the above description has been given of step G being formed by the difference in plate thickness between flange 18 and first concave spherical surface 17, this is not limiting. Step G may be formed in an annular shape by a single or multiple fixing members (for example, first fixing member 19 and second fixing member 25, which will be described later). In this case, the plate thickness of flange 18 may be equal to the plate thickness of first concave spherical surface 17.

[0020] The fixing portion 24 fixes the flange 18 to the upper shoe base 11. The fixing portion 24 includes a first fixing member 19. The first fixing member 19 is an annular member. The first fixing member 19 is called, for example, a stopper ring. The first fixing member 19 is attached so that the flange 18 of the first concave spherical surface 17 is sandwiched between the first fixing member 19 and the upper shoe base 11. As shown in FIG. 2, the first fixing member 19 is formed with drilled holes over the entire circumferential direction thereof, through which a plurality of fixing bolts 20 are inserted.

[0021] The fixing bolts 20 are inserted through drilled holes formed in the first fixing members 19, and their tips are threaded into a plurality of third recesses 15 formed circumferentially dispersed on the edge of the upper shoe base 11. Therefore, the first fixing members 19 are fixed to the upper shoe base 11 with the flange 18 sandwiched between them. As a result, the flange 18 is pressed by the first fixing members 19, which are pressed against the upper shoe base 11, at a plurality of circumferentially aligned positions on the annular edge of the upper shoe base 11. As a result, the annular flange 18 is pressed against the upper shoe base 11 over the entire circumferential direction. Therefore, it is possible to prevent a pressing load from concentrating on the drilled holes of the fixing bolts 20 in the flange 18, and the life of the flange 18 can be extended.

[0022] The retraction means 23 retracts and fixes the first sliding plate 16 into the upper shoe base 11. The retraction means 23, for example, applies a tensile force to the first sliding plate 16 toward the upper shoe base 11. In this embodiment, the retraction means 23 includes a connecting bolt 21 and a nut 22. As shown in Fig. 5, the connecting bolt 21 is housed in the second recess 14. Fig. 5 is a cross-sectional view showing the vicinity of the connecting bolt 21 engaging with the nut 22. The connecting bolt 21 engages with the nut 22. More specifically, the connecting bolt 21 is inserted into the upper shoe base 11 from the side opposite to the side where the first sliding plate 16 is provided, and is screwed into the nut 22.

[0023] The tip of the connecting bolt 21 is contained within the thickness of the nut 22. As described above, the nut 22 is received in the first recess 13. The nut 22 is welded to the back surface of the first sliding plate 16, i.e., the side opposite the side where the first concave spherical surface 17 is formed. The nut 22 is threadedly engaged with the connecting bolt 21 as described above. The first sliding plate 16 is fixed to the upper shoe base 11 by threading the nut 22 with the connecting bolt 21. This configuration is therefore suitable for cases where a high precision in the radius of curvature of the first sliding plate 16 is required. That is, although the radius of curvature of the upper shoe base 11 can be precisely controlled by machining, if the first sliding plate 16 is simply fitted into the concave curved surface 12 of the upper shoe base 11, a small gap may be formed between the first sliding plate 16 and the concave curved surface 12 of the upper shoe base 11, even if the fitting is precise. As a result, the precision of the radius of curvature of the first sliding plate 16 may be compromised. In this regard, with the configuration of this embodiment, by fastening the first sliding plate 16 to the upper shoe base 11 using the connecting bolt 21 and the nut 22, the first sliding plate 16 can be pressed against the concave curved surface 12 of the upper shoe base 11, and the shape of the first sliding plate 16 can be matched with the shape of the concave curved surface 12 of the upper shoe base 11 with high precision. This ensures the accuracy of the radius of curvature of the first sliding plate 16. Furthermore, because the nut 22 is provided on the back surface of the first sliding plate 16, there is no need to drill a hole on the surface of the first sliding plate 16 to accommodate or engage the connecting bolt 21, and the slidability of the first concave spherical surface 17 is not impaired.

[0024] The direction of the axis AX of the connecting bolt 21 and the nut 22 is not particularly limited. FIG. 4 is a cross-sectional view showing connecting bolts 21 and nuts 22 having different axis AX. For example, as shown in FIG. 4( a), the axis AX of the connecting bolt 21 and the nut 22 may be aligned vertically with the first concave spherical surface 17. Here, when removing the first sliding plate 16 from the upper shoe base 11 to process the first sliding plate 16, for example, it is necessary to remove the connecting bolt 21 engaged with the nut 22. If the axis AX of the connecting bolt 21 and the nut 22 is aligned vertically, the connecting bolt 21 can be removed vertically. Therefore, the connecting bolt 21 and the first sliding plate 16 can be easily removed from the upper shoe base 11, and the first sliding plate 16 can be easily processed. Furthermore, for example, the axis AX of the connecting bolt 21 and the nut 22 may be aligned along the normal direction of the first concave spherical surface 17, as shown in FIG. 4(b). Here, when the first sliding plate 16 is fixed by the connecting bolt 21 and the nut 22, a load is applied to the first sliding plate 16. When the axis AX of the connecting bolt 21 and the nut 22 is aligned along the normal direction of the first concave spherical surface 17, the load can be applied more uniformly to the sliding plate 16 than when the axis AX is aligned along a direction other than the normal direction of the first concave spherical surface 17. Therefore, the load applied to the sliding plate 16 can be dispersed.

[0025] Returning to FIG. 1, the lower shoe 27 includes a lower shoe base 28, a second sliding plate 33, and a fixing portion 38. The lower shoe base 28 is formed with a concave curved surface 29. Furthermore, the lower shoe base 28 is formed with a fourth recess 30, a fifth recess 31, and a sixth recess 32. The fourth recess 30, the fifth recess 31, and the sixth recess 32 correspond to the first recess 13, the second recess 14, and the third recess 15 formed in the upper shoe base 11. The second sliding plate 33 is formed with a second concave spherical surface 34 and a flange 35. Furthermore, the second sliding plate 33 is provided with a fixing bolt 37. The fixing portion 38 includes a first fixing member 36 . The configuration of the lower shoe 27 from the lower shoe base portion 28 to the fixing portion 38 corresponds to the configuration of the upper shoe 10, and therefore a description thereof will be omitted.

[0026] The support 40 has a substantially cylindrical shape. Here, "substantially cylindrical shape" refers to a shape whose external shape is roughly a cylinder. For example, the substantially cylindrical shape may include a shape whose bottom or side has a three-dimensional curvature. As shown in FIG. 1, the support 40 is disposed vertically between the upper shoe 10 and the lower shoe 27. The support 40 is movable horizontally relative to both the upper shoe 10 and the lower shoe 27. Therefore, the sliding bearing 100 equipped with the support 40 has a restoring force. As a result, the sliding bearing 100 can self-return even in the event of an earthquake or the like. Therefore, after an earthquake occurs, there is no need to manually return the sliding bearing 100 to its position before the earthquake. In other words, the sliding bearing 100 according to this embodiment has superior maintenance performance compared to a planar sliding seismic isolation device. The support body 40, like the upper shoe base 11, is made of rolled steel for welding steel (SM490A, B, C, or SN490B, C, or S45C), stainless steel (SUS material), cast steel, cast iron, etc. The support body 40 is made of a material with a surface pressure of 60 N / mm 2 Furthermore, for example, if the support 40 is made of SUS304, the yield load of the support 40 is 206 MPa or more, and the load that ensures the movement of the support 40 is 120 MPa.

[0027] As shown in FIG. 2, the support 40 includes a first convex spherical surface 41, a second convex spherical surface 42, and a side peripheral surface 43. The first convex spherical surface 41 faces the upper shoe 10 in the vertical direction and is located on the bottom surface of the approximately cylindrical support body 40. The first convex spherical surface 41 slides against the first concave spherical surface 17 of the upper shoe 10. As shown in FIG. 6 , the first convex spherical surface 41 and the second convex spherical surface 42 are covered with a friction material 44.

[0028] Here, the values ​​of the radii of curvature of the first convex spherical surface 41 and the first concave spherical surface 17 are not particularly limited. For example, the first convex spherical surface 41 may have a radius of curvature smaller than the radius of curvature of the first concave spherical surface 17. Here, when the support 40 moves horizontally relative to both the upper shoe 10 and the lower shoe 27 and reaches the vicinity of the outer periphery of the first concave spherical surface 17, distortion occurs at the outer periphery. Therefore, when the first convex spherical surface 41 has a radius of curvature smaller than the radius of curvature of the first concave spherical surface 17, it is possible to avoid distortion from maximizing at the outer periphery of the first concave spherical surface 17. Furthermore, for example, the radius of curvature of a portion of the first convex spherical surface 41 may be smaller than the radius of curvature of the first concave spherical surface 17. In this case, compared to when the radius of curvature of the entire first convex spherical surface 41 is smaller than the radius of curvature of the first concave spherical surface 17, it is possible to suppress maximization of distortion at the first ridge line 47 and the second ridge line 48 of the support body 40, and it is possible to suppress excessive wear of the friction material 44 at the edges of the first convex spherical surface 41 and the second convex spherical surface 42 of the support body 40 when the support body 40 slides. This reduces the frequency of replacement of the friction material 44, improving maintainability. Furthermore, for example, the radius of curvature of the first convex spherical surface 41 may be equal to the radius of curvature of the first concave spherical surface 17. In this case, the support 40 can slide appropriately along the first concave spherical surface 17. Therefore, the slidability of the support 40 can be improved.

[0029] The second convex spherical surface 42 is located on the bottom surface facing the lower shoe 27 in the vertical direction. It slides on the second concave spherical surface 34 of the lower shoe 27. The relationship between the radius of curvature of the second convex spherical surface 42 and the radius of curvature of the second concave spherical surface 34 is similar to the relationship between the radius of curvature of the first convex spherical surface 41 and the radius of curvature of the first concave spherical surface 17, so a description thereof will be omitted here.

[0030] The side peripheral surface 43 is located on the side surface of the substantially cylindrical support body 40. In detail, the side peripheral surface 43 is located over the entire periphery of the side surface of the support body 40. The side peripheral surface 43 and the first convex spherical surface 41 form a first annular ridgeline 47, and the side peripheral surface 43 and the second convex spherical surface 42 form a second annular ridgeline 48. Furthermore, as shown in FIGS. 2 and 3(b), these ridgelines are curved in a cross section including the central axis of the support body 40. Here, when the support body 40 moves horizontally relative to both the upper shoe 10 and the lower shoe 27 and reaches the vicinity of the outer periphery of the first concave spherical surface 17, distortion occurs on the outer periphery. On the other hand, the first ridgeline 47 and the second ridgeline 48 are curved in a cross section including the central axis of the support body 40. Therefore, distortion occurring on the outer periphery can be suppressed.

[0031] The friction material 44 covers the support body 40. More specifically, the friction material 44 is disposed from the first convex spherical surface 41 and the second convex spherical surface 42 (sliding surfaces) of the support body 40 to the side peripheral surface 43, and covers the support body 40. Furthermore, the friction material 44 is fixed to the side peripheral surface 43. This reduces the risk of the friction material 44 peeling off from the support body 40. This improves the maintainability of the friction material 44.

[0032] The method for fixing the friction material 44 to the support body 40 is not particularly limited. For example, the friction material 44 may be fixed to the support body 40 via an adhesive. Furthermore, for example, the friction material 44 may be fixed to the side circumferential surface 43 by an annular fastening band (not shown).

[0033] As described above, the first ridge line 47 and the second ridge line 48 have a curved shape in a cross section including the central axis of the support body 40. Therefore, in this case, the friction material 44 can be easily arranged from the first convex spherical surface 41 to the side circumferential surface 43 of the support body 40 and from the second convex spherical surface 42 to the side circumferential surface 43.

[0034] The friction material 44 is a double woven fabric formed of first fibers 45 and second fibers 46. Therefore, compared to a friction material 44 that is, for example, a single woven fabric, the friction material 44 of this embodiment has high surface pressure resistance. Therefore, the support body 40 covered with the friction material 44 has high sliding durability. The second fibers 46 have a higher tensile strength than the first fibers 45. Furthermore, the second fibers 46 have a higher coefficient of friction than the first fibers 45. For example, the first fibers 45 may be PTFE fibers, and the second fibers 46 may be PPS fibers. Furthermore, for example, the first fibers 45 and the second fibers 46 may be fibers formed from a plastic material. Specifically, the first fibers 45 and the second fibers 46 may be high-strength fibers such as aramid fibers or high-strength high-density polyethylene fibers.

[0035] 5 is a schematic diagram showing an example of the structure of the friction material 44 that covers the first convex spherical surface 41. The structure of the friction material 44 will be described below with reference to FIG. As shown in FIG. 5, the first fiber 45 includes a first weft yarn 45a and a first warp yarn 45b. Similarly, the second fiber 46 comprises second weft yarns 46a and second warp yarns 46b. The first fibers 45 are disposed vertically higher than the second fibers 46 relative to the first convex spherical surface 41. The first warp threads 45b of the first fibers 45 are woven so as to wrap around the first weft threads 45a. The second warp yarns 46b of the second fiber 46 are woven so as to wrap around the second weft yarns 46a. Furthermore, the first warp threads 45b of the first fiber 45 are woven so as to also wrap around the second weft threads 46a of the second fiber 46 which are positioned vertically below the first warp threads 45b.

[0036] According to the configuration of the sliding bearing 100 of this embodiment described above, the sliding bearing 100 comprises the upper shoe 10 fixed to the upper structure H, the lower shoe 27 fixed to the lower structure L, and the support 40 disposed between the upper shoe 10 and the lower shoe 27 and movable horizontally relative to both the upper shoe 10 and the lower shoe 27. Therefore, the sliding bearing 100 equipped with the support 40 has a restoring force, allowing it to self-restore even in the event of an earthquake or other disaster. Therefore, after an earthquake occurs, there is no need to manually return the sliding bearing 100 to its pre-earthquake position. In other words, the sliding bearing 100 of this embodiment has superior maintenance performance compared to planar sliding seismic isolation devices.

[0037] According to the configuration of the sliding bearing 100 of this embodiment, the upper shoe 10 comprises a plate-shaped first sliding plate 16 on which a first concave spherical surface 17 is formed, and an upper shoe base 11 to which the first sliding plate 16 is attached. Therefore, the first sliding plate 16 is formed separately from the upper shoe base 11. Therefore, for example, in cases where it is desired to process only the first sliding plate 16 and not the upper shoe base 11, the first sliding plate 16 can be handled more easily because it does not have to be handled together with the heavy upper shoe base 11.

[0038] According to the configuration of the sliding bearing 100 of this embodiment, the upper shoe base 11 has a concavely curved surface 12 on the surface to which the first sliding plate 16 is attached, and the first sliding plate 16 is fixed to the upper shoe base 11 in a shape that follows the concavely curved surface 12 of the upper shoe base 11. Therefore, for example, even if the first sliding plate 16 does not have a desired curvature, the first sliding plate 16 can be corrected by the concavely curved surface 12 of the upper shoe base 11, and the first sliding plate 16 can be shaped to follow the concavely curved surface 12 of the upper shoe base 11. In this case, for example, it is possible to relax the machining precision of the first sliding plate 16, making it easier to machine the first sliding plate 16.

[0039] According to the configuration of the sliding bearing 100 of this embodiment, the sliding bearing 100 is provided with a retraction means 23 that retracts and fixes the first sliding plate 16 into the upper shoe base 11. Therefore, the retraction means 23 allows the first sliding plate 16 to be fixed to the upper shoe base 11 more firmly.

[0040] The retraction means 23 of the sliding bearing 100 of this embodiment further includes a nut 22 provided on the back surface of the first sliding plate 16 and a connecting bolt 21 inserted into the upper shoe base 11 from the side opposite the side where the first sliding plate 16 is provided and engaging with the nut 22. Therefore, the first sliding plate 16 is fixed to the upper shoe base 11 by engaging the nut 22 with the connecting bolt 21. This makes this configuration suitable for situations where a high precision in the radius of curvature of the first sliding plate 16 is required. While the radius of curvature of the upper shoe base 11 can be precisely controlled by machining, a configuration in which the first sliding plate 16 is simply fitted into the concave surface 12 of the upper shoe base 11 may result in a small gap between the first sliding plate 16 and the concave surface 12 of the upper shoe base 11, even with precise fitting. As a result, the precision of the radius of curvature of the first sliding plate 16 may be compromised. In this regard, according to the above configuration, by fastening the first sliding plate 16 so as to attract it to the upper shoe base 11 with the connecting bolts 21 and nuts 22, the first sliding plate 16 can be pressed against the concave curved surface 12 of the upper shoe base 11, and the shape of the first sliding plate 16 can be made to match the shape of the concave curved surface 12 of the upper shoe base 11 with high precision. Therefore, precision in the radius of curvature of the first sliding plate 16 can be ensured. Furthermore, since the nut 22 is provided on the back surface of the first sliding plate 16, there is no need to drill a hole on the surface of the first sliding plate 16 to accommodate or engage the connecting bolt 21, and the sliding properties of the first concave spherical surface 17 are not impaired.

[0041] According to the configuration of the sliding bearing 100 of this embodiment, the axis AX of the connecting bolt 21 and the nut 22 is aligned along the normal direction of the first concave spherical surface 17 formed on the first sliding plate 16. Here, when the first sliding plate 16 is fixed by the connecting bolt 21 and the nut 22, a load is applied to the first sliding plate 16. When the axis AX of the connecting bolt 21 and the nut 22 is aligned along the normal direction of the first concave spherical surface 17, the load can be applied more uniformly to the sliding plate 16 compared to when the axis AX is aligned along a direction other than the normal direction of the first concave spherical surface 17. Therefore, the load applied to the sliding plate 16 can be dispersed.

[0042] According to the configuration of the sliding bearing 100 of this embodiment, the axis AX of the connecting bolt 21 and the nut 22 is aligned in the vertical direction. Here, when removing the first sliding plate 16 from the upper shoe base 11, for example, to process the first sliding plate 16, it is necessary to remove the connecting bolt 21 engaged with the nut 22. If the axis AX of the connecting bolt 21 and the nut 22 is aligned vertically, the connecting bolt 21 can be removed vertically. Therefore, the connecting bolt 21 and the first sliding plate 16 can be easily removed from the upper shoe base 11, and the first sliding plate 16 can be easily processed.

[0043] According to the configuration of the sliding bearing 100 of this embodiment, the upper shoe 10 further includes a fixing portion 24, and the first sliding plate 16 includes an annular flange 18, and the fixing portion 24 fixes the flange 18 to the upper shoe base 11. Therefore, the flange 18 can be used to fix the first sliding plate 16 to the upper shoe base 11.

[0044] The fixing portion 24 provided on the sliding bearing 100 of this embodiment corresponds to the shape of the flange 18 and is provided with an annular first fixing member 19 that continues in the circumferential direction of the flange 18, and the first fixing member 19 is fixed to the upper shoe base 11 with the flange 18 sandwiched between it and the upper shoe base 11. As a result, the flange 18 is pressed against the upper shoe base 11 over the entire circumferential direction, and the flange 18 can be stably fixed to the upper shoe base 11.

[0045] According to the configuration of the sliding bearing 100 of this embodiment, the support body 40 is covered with the friction material 44, and the friction material 44 is a double woven fabric formed of first fibers 45 and second fibers 46 that have a higher tensile strength and a higher coefficient of friction than the first fibers 45. Therefore, compared to when the friction material 44 is, for example, a single woven fabric, the friction material 44 of this embodiment has high surface pressure resistance. Therefore, the support body 40 covered with the friction material 44 has high sliding durability.

[0046] According to the configuration of the sliding bearing 100 of this embodiment, the support body 40 is substantially cylindrical and includes a first convex spherical surface 41 located on the bottom surface of the support body 40 and sliding against the first concave spherical surface 17, and a side peripheral surface 43 located on the side surface of the support body 40, and the first convex spherical surface 41 is covered with a friction material 44. The friction material 44 is disposed from the first convex spherical surface to the side peripheral surface 43 of the support body 40 and is fixed at the side peripheral surface 43. This reduces the risk of the friction material 44 peeling off from the support body 40. This improves the ease of maintenance of the friction material 44.

[0047] According to the configuration of the sliding bearing 100 of this embodiment, the support 40 has a first convex spherical surface 41 that slides on the first concave spherical surface 17, and the first convex spherical surface 41 has a radius of curvature that is smaller than the radius of curvature of the first concave spherical surface 17. Here, when the support 40 moves horizontally relative to both the upper shoe 10 and the lower shoe 27 and reaches the vicinity of the outer periphery of the first concave spherical surface 17, distortion occurs at the outer periphery. Therefore, when the first convex spherical surface 41 has a radius of curvature smaller than the radius of curvature of the first concave spherical surface 17, it is possible to avoid distortion at the outer peripheral edge of the first concave spherical surface 17 becoming maximized.

[0048] According to the configuration of the sliding bearing 100 of this embodiment, the radius of curvature of a portion of the first convex spherical surface 41 is smaller than the radius of curvature of the first concave spherical surface 17. In this case, compared to when the radius of curvature of the entire surface of the first convex spherical surface 41 is smaller than the radius of curvature of the first concave spherical surface 17, it is possible to prevent distortion at the first ridge line 47 and the second ridge line 48 of the support body 40 from becoming maximized, and it is possible to prevent wear of the friction material 44 from progressing excessively at the edges of the first convex spherical surface 41 and the second convex spherical surface 42 of the support body 40 when the support body 40 slides. This reduces the frequency of replacement of the friction material 44, improving maintainability.

[0049] According to the configuration of the sliding bearing 100 of this embodiment, the support 40 has a substantially cylindrical shape and includes a first convex spherical surface 41 located on the bottom surface of the support 40 and sliding against the first concave spherical surface 17, and a side peripheral surface 43 located on the side surface of the support 40. The first annular ridge 47 formed by the first convex spherical surface 41 and the side peripheral surface 43 has a curved shape in a cross section including the axis of the support 40. Here, when the support 40 moves horizontally relative to both the upper shoe 10 and the lower shoe 27 and reaches the vicinity of the outer periphery of the first concave spherical surface 17, strain is generated on the outer periphery. On the other hand, the first ridge 47 has a curved shape in a cross section including the central axis of the support 40. Therefore, strain generated on the outer periphery can be suppressed.

[0050] According to the configuration of the sliding bearing 100 of this embodiment, the upper shoe 10 has an annular step G that surrounds the outer periphery of the first concave spherical surface 17. Therefore, when the support body 40 moves freely radially outward relative to the upper shoe 10 and comes into contact with the step G, the step G restricts the support body 40 from moving further radially outward. Therefore, the step G can prevent the support body 40 from jumping out radially outward from the upper shoe 10.

[0051] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, the lower shoe 27 has been described as having a configuration corresponding to the upper shoe 10, but is not limited to this. For example, the lower shoe 27 may not correspond to the upper shoe 10 and may have a different configuration from the upper shoe 10. Furthermore, for example, the lower shoe 27 may have a configuration corresponding to the upper shoe 10 described in this embodiment, but the upper shoe 10 may have a different configuration from that described in this embodiment and not correspond to the lower shoe 27.

[0052] Also, for example, the retraction means 23 does not have to include the connecting bolt 21 and the nut 22. Therefore, the retraction means 23 included in the upper shoe 10 may fix the first sliding plate 16 in a state where it is retracted into the upper shoe base 11 using means other than the connecting bolt 21 and the nut 22 (for example, a hat-shaped bracket having a connecting hole on the top surface into which the connecting bolt 21 screws instead of the nut 22, or a turnbuckle, etc.). Furthermore, for example, the radius of curvature of the first convex spherical surface 41 of the support 40 may be equal to the radius of curvature of the first concave spherical surface 17. In this case, the support 40 can slide appropriately along the first concave spherical surface 17. Therefore, the slidability of the support 40 on the first concave spherical surface 17 can be improved.

[0053] (First Modification) Furthermore, for example, the sliding bearing 100 may not be equipped with the retraction means 23. That is, as shown in FIG. 7 , the first sliding plate 16 may be fixed to the upper shoe base 11 by the entire back surface of the first concave spherical surface 17 of the first sliding plate 16 abutting against the concave curved surface 12 of the upper shoe base 11. In detail, the first sliding plate 16 may have the entire back surface of the first concave spherical surface 17 pressed against the concave curved surface 12 of the upper shoe base 11 in a state in which the first concave spherical surface 17 is elastically deformed toward the center of curvature (a state in which the curvature of the first concave spherical surface 17 is elastically deformed so as to increase). At this time, the entire back surface of the first concave spherical surface 17 of the first sliding plate 16 is pressed against the concave curved surface 12 by a restoring force in the direction opposite to the center of curvature, which is generated by the elastic deformation toward the center of curvature. FIG. 7 is a cross-sectional view of the sliding bearing 100 without the retraction means 23 . In this case, compared to a configuration in which the back surface of the first sliding plate 16 is pulled into the upper shoe base 11, it is possible to make it less likely that localized disturbance of the curvature of the first sliding plate 16 will occur. There are no particular limitations on the method for abutting and fixing the back surface of the first concave spherical surface 17 to the concave curved surface 12. For example, the first sliding plate 16 may be pressed into or fitted into the concave curved surface 12 of the upper shoe base 11 without being retracted into the upper shoe base 11 by the retraction means 23. For example, the entire back surface of the first concave spherical surface 17 of the first sliding plate 16 may be adhesively fixed to the concave curved surface 12 of the upper shoe base 11. 7, even if the sliding bearing 100 does not have the retraction means 23, the flange 18 of the first sliding plate 16 may be fixed by the fixing portion 24, or may be fixed by directly pressing the fixing bolt 20. In this case, the first sliding plate 16 having the flange 18 can be prevented from coming off the upper shoe base 11.

[0054] (Second Modification) Furthermore, for example, as shown in FIG. 8 , the fixing portion 24 of the upper shoe 10 may include multiple second fixing members 25 instead of the first fixing member 19. FIG. 8 is an exploded perspective view of a sliding bearing 100 in which the fixing portion 24 includes multiple second fixing members 25. The second fixing members 25 are, for example, fan-shaped and have a constant length in the circumferential direction of the flange 18. In the example of FIG. 8 , the second fixing members 25 are distributed along the circumferential direction. In this case, the second fixing members 25 fix the flange 18 by sandwiching multiple locations of the flange 18 between the second fixing members 25 and the outer edge of the upper shoe base 11. Furthermore, like the first fixing members 19, each second fixing member 25 may be fixed to the flange 18 by inserting a fixing bolt 20 through the second fixing member 25 and threading it into a corresponding third recess 15 in the upper shoe base 11. While the first fixing member 19 has a continuous configuration in the circumferential direction of the flange 18, the multiple second fixing members 25 are not continuous with one another in the circumferential direction of the flange 18. However, because each second fixing member 25 has a constant length in the circumferential direction, when the fixing bolt 20 is inserted into the second fixing member 25, the tightening force of the fixing bolt 20 can be dispersed.

[0055] (Third Modification) On the other hand, the upper shoe 10 does not have to have the fixing portion 24. Fig. 9 is an exploded perspective view of the sliding bearing 100 when the upper shoe 10 does not have the fixing portion 24. In this case, as shown in Fig. 9, the flange 18 of the first sliding plate 16 may be fixed to the upper shoe base 11 by inserting and screwing the fixing bolt 20 directly into the third recess 15 (without going through the first fixing member 19 or the second fixing member 25).

[0056] According to the sliding bearing 100 of the third modified example, the first sliding plate 16 is provided with an annular flange 18, and the flange 18 is fixed to the upper shoe base 11 by being directly pressed by the fixing bolt 20. Therefore, the configuration for fixing the flange 18 to the upper shoe base 11 can be further simplified.

[0057] (Other variations) The shape of the support 40 may be a shape other than a substantially cylindrical shape. For example, the support 40 may be a square prism or a sphere. Furthermore, the support body 40 does not have to be covered with the friction material 44. For example, a portion of the support body 40 may be covered with the friction material 44. In addition, when the support body 40 is covered with the friction material 44, the friction material 44 may be disposed only on the sliding surface of the support body 40. Furthermore, the upper shoe 10 may be integrally molded without including the first sliding plate 16 and the upper shoe base 11. Furthermore, for example, the upper shoe 10 may not include the step G. In this case, for example, the radius of curvature of the peripheral edge of the first concave spherical surface 17 may be made smaller than the radius of curvature of the portion other than the peripheral edge, thereby preventing the support body from protruding radially outward from the upper shoe 10.

[0058] In addition, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of the present disclosure.

[0059] (Addendum) <1> A sliding bearing according to one embodiment of the present disclosure is a sliding bearing arranged between an upper structure and a lower structure facing the upper structure, and is characterized by comprising an upper shoe fixed to the upper structure, a lower shoe fixed to the lower structure, and a support arranged between the upper shoe and the lower shoe and capable of moving horizontally relative to both the upper shoe and the lower shoe, wherein the upper shoe has a first spherical concave spherical surface, and the lower shoe has a second spherical concave spherical surface.

[0060] According to the above configuration, the sliding bearing comprises an upper shoe fixed to the upper structure, a lower shoe fixed to the lower structure, and a support body disposed between the upper shoe and the lower shoe and capable of relative horizontal movement with respect to both the upper shoe and the lower shoe. Therefore, the sliding bearing equipped with the support body has a restoring force, allowing it to self-restore even in the event of an earthquake or other disaster. Therefore, there is no need to manually return the sliding bearing to its pre-earthquake position after an earthquake. In other words, the sliding bearing according to this embodiment has superior maintenance performance compared to planar sliding seismic isolation devices.

[0061] <2> the above <1> In the sliding bearing according to the above, the upper shoe is characterized by comprising a plate-shaped first sliding plate on which a first concave spherical surface is formed, and an upper shoe base to which the first sliding plate is attached.

[0062] According to the above configuration, the upper shoe includes a plate-shaped first sliding plate having a first concave spherical surface formed thereon, and an upper shoe base to which the first sliding plate is attached. Therefore, the first sliding plate is molded separately from the upper shoe base. Therefore, for example, when processing only the first sliding plate and not the upper shoe base, the first sliding plate does not need to be handled together with the heavy upper shoe base, making it easier to handle.

[0063] <3> the above <2> In the sliding support relating to the above, the upper shoe base has a concave curved surface on the surface to which the first sliding plate is attached, and the first sliding plate is fixed to the upper shoe base in a shape that follows the concave curved surface of the upper shoe base.

[0064] According to the above configuration, the upper shoe base has a concave curved surface on the surface to which the first sliding plate is attached, and the first sliding plate is fixed to the upper shoe base in a shape that conforms to the concave curved surface of the upper shoe base. Therefore, for example, even if the first sliding plate 16 does not have a desired curvature, the first sliding plate 16 can be corrected by the concave curved surface 12 of the upper shoe base 11, and the first sliding plate 16 can be shaped to conform to the concave curved surface 12 of the upper shoe base 11. In this case, for example, it is possible to relax the processing precision of the first sliding plate 16, making it easier to process the first sliding plate 16.

[0065] <4> the above <2> or <3> The sliding bearing according to the above is characterized in that it is provided with a retraction means for retracting and fixing the first sliding plate into the upper shoe base.

[0066] According to the above configuration, the sliding support is characterized by having a retraction means that retracts and fixes the first sliding plate into the upper shoe base. Therefore, the retraction means allows the first sliding plate to be firmly fixed by the sliding support.

[0067] <5> the above <4> In the sliding bearing according to the above, the retraction means further comprises a nut provided on the back surface of the first sliding plate, and a connecting bolt that is inserted into the upper shoe base from the side opposite to the side on which the first sliding plate is provided and engages with the nut, and the upper shoe base is formed with a recess in which the nut is accommodated on the surface on the side on which the first sliding plate is provided, and the tip of the connecting bolt is within the thickness of the nut.

[0068] According to the above configuration, the retraction means further includes a nut provided on the back surface of the first sliding plate and a connecting bolt inserted from the side opposite the first sliding plate to the upper shoe base and engaging with the nut. Therefore, the first sliding plate is fixed to the upper shoe base by engaging the nut with the connecting bolt. This configuration is therefore suitable for cases where precision in the radius of curvature of the first sliding plate is required. That is, although the radius of curvature of the upper shoe base can be precisely controlled by machining, if the first sliding plate is simply fitted into the concave surface of the upper shoe base, there is a risk of a small gap between the first sliding plate and the concave surface of the upper shoe base, even if the fit is precise. As a result, the precision of the radius of curvature of the first sliding plate may be compromised. In this regard, with the above configuration, by fastening the first sliding plate to the upper shoe base with the connecting bolts and nuts, the first sliding plate can be pressed against the concave curved surface of the upper shoe base, and the shape of the first sliding plate can be made to match the shape of the concave curved surface of the upper shoe base with high precision, thereby ensuring precision in the radius of curvature of the first sliding plate. Furthermore, since the nut is provided on the back surface of the first sliding plate, there is no need to drill a hole on the surface of the first sliding plate to accommodate or engage the connecting bolt, and the sliding properties of the first concave spherical surface are not impaired.

[0069] <6> the above <5> In the sliding bearing according to the above, the axial centers of the connecting bolt and the nut are aligned along the normal direction of the first concave spherical surface formed on the first sliding plate.

[0070] According to the above configuration, the axial centers of the connecting bolt and nut are aligned along the normal direction of the first concave spherical surface formed on the first sliding plate. Here, when the first sliding plate is fixed by the connecting bolt and nut, a load is applied to the first sliding plate. When the axial centers of the connecting bolt and nut are aligned along the normal direction of the first concave spherical surface, the load can be applied more uniformly to the sliding plate compared to when the axial centers are aligned in a direction other than the normal direction of the first concave spherical surface. Therefore, the load applied to the sliding plate can be distributed.

[0071] <7> the above <5> In the sliding bearing according to the above, the axial centers of the connecting bolt and the nut are aligned in the vertical direction.

[0072] According to the above configuration, the axial centers of the connecting bolt and the nut are aligned in the vertical direction. Here, when removing the first sliding plate from the upper shoe base to process it, for example, it is necessary to remove the connecting bolt that engages with the nut. If the axes of the connecting bolt and nut are aligned vertically, the connecting bolt can be removed vertically. Therefore, the connecting bolt and the first sliding plate can be easily removed from the upper shoe base, and the first sliding plate can be easily processed.

[0073] <8> the above <3> In the sliding bearing according to the above, the first sliding plate is characterized in that the entire back surface of the first concave spherical surface abuts against the concave curved surface of the upper shoe base.

[0074] According to the above configuration, the first sliding plate is characterized in that the entire back surface of the first concave spherical surface abuts against the concave curved surface of the upper shoe base. Therefore, in this case, compared to when the first sliding plate is pulled into the upper shoe base at multiple points from the back surface of the first concave spherical surface, it is possible to make it less likely that the curvature of the first sliding plate will be locally disturbed.

[0075] <9> the above <2> In the sliding bearing according to the above, the upper shoe further comprises a fixing portion, the first sliding plate comprises an annular flange, and the fixing portion fixes the flange to the upper shoe base.

[0076] According to the above configuration, the upper shoe further includes a fixing portion, the first sliding plate includes an annular flange, and the fixing portion fixes the flange to the upper shoe base. Thus, the flange can be used to fix the first sliding plate to the upper shoe base.

[0077] <10> the above <9> In the sliding bearing according to the above, the fixing portion is provided with an annular first fixing member that corresponds to the shape of the flange and is continuous in the circumferential direction of the flange, and the first fixing member is fixed to the upper shoe base with the flange sandwiched between it and the upper shoe base.

[0078] According to the above configuration, the first fixing member is fixed to the upper shoe base with the flange sandwiched between the first fixing member and the upper shoe base. This allows the flange to be pressed against the upper shoe base over the entire circumferential direction, stably fixing the flange to the upper shoe base. This prevents the pressure load from concentrating on the bolt insertion holes of the flange.

[0079] <11> the above <9> In the sliding bearing according to the above, the fixing portion is characterized in that it has a plurality of second fixing members that are distributed around the circumferential direction of the flange, and the second fixing members are fixed to the upper shoe base with the flange sandwiched between them.

[0080] According to the above configuration, the fixing portion includes a plurality of second fixing members dispersedly arranged along the circumferential direction of the flange, and the second fixing members are fixed to the upper shoe base with the flange sandwiched between them. Therefore, when the second fixing members are fixed to the flange via bolts, for example, the tightening force of the bolts can be dispersed.

[0081] <12> the above <2> In the sliding support relating to the above, the first sliding plate has an annular flange, and the flange is fixed to the upper shoe base by being pressed directly (without going through the first fixing member or the second fixing member) by a fixing bolt.

[0082] According to the above configuration, the first sliding plate has an annular flange, and the flange is fixed to the upper shoe base by being directly pressed by the fixing bolt, which makes it possible to further simplify the configuration for fixing the flange to the upper shoe base.

[0083] <13> the above <1> ~ <12> In any one of the sliding bearings, the support body is covered with a friction material, and the friction material is a double woven fabric formed of first fibers and second fibers having a higher tensile strength than the first fibers and a higher coefficient of friction than the first fibers.

[0084] According to the above configuration, the support is covered with a friction material, and the friction material is a double woven fabric formed of first fibers and second fibers having a higher tensile strength and a higher coefficient of friction than the first fibers. Therefore, compared to a friction material made of, for example, a single woven fabric, the friction material of this embodiment has high surface pressure resistance. Therefore, the support covered with the friction material has high sliding durability.

[0085] <14> the above <13> In the sliding bearing according to the above, the support body is approximately cylindrical in shape and has a first convex spherical surface located on the bottom surface of the support body and sliding against the first concave spherical surface, and a side peripheral surface located on the side surface of the support body, and the friction material is arranged from the sliding surface of the support body to the side peripheral surface and fixed on the side peripheral surface.

[0086] According to the above configuration, the friction material is fixed at the side circumferential surface, which reduces the risk of the friction material peeling off from the support, thereby improving the maintainability of the friction material.

[0087] <15> the above <1> ~ <14> In any one of the sliding bearings, the support body has a first convex spherical surface that slides against the first concave spherical surface, and the first convex spherical surface has a radius of curvature that is smaller than the radius of curvature of the first concave spherical surface.

[0088] According to the above configuration, the first convex spherical surface has a radius of curvature smaller than the radius of curvature of the first concave spherical surface. Here, when the support body moves relatively to both the upper shoe and the lower shoe in the horizontal direction and reaches the vicinity of the outer periphery of the first concave spherical surface, strain occurs on the outer periphery. Therefore, when the first convex spherical surface has a smaller radius of curvature than the radius of curvature of the first concave spherical surface, it is possible to avoid distortion at the outer peripheral edge of the first concave spherical surface 17 becoming maximized.

[0089] <16> the above <15> In the sliding bearing according to the above, the radius of curvature of a portion of the first convex spherical surface is smaller than the radius of curvature of the first concave spherical surface.

[0090] According to the above configuration, the radius of curvature of a portion of the first convex spherical surface is smaller than the radius of curvature of the first concave spherical surface. In this case, compared to when the radius of curvature of the entire first convex spherical surface is smaller than the radius of curvature of the first concave spherical surface, it is possible to prevent distortion at the first ridgeline and second ridgeline of the support body from becoming excessively large, and it is possible to prevent excessive wear of the friction material at the edges of the first convex spherical surface and second convex spherical surface of the support body when the support body slides. This reduces the frequency of replacement of the friction material and improves maintainability.

[0091] <17> the above <1> ~ <13> In any one of the sliding bearings, the support body has a first convex spherical surface that slides against the first concave spherical surface, and the radius of curvature of the first convex spherical surface is equal to the radius of curvature of the first concave spherical surface.

[0092] According to the above configuration, the radius of curvature of the first convex spherical surface is equal to the radius of curvature of the first concave spherical surface. In this case, the support can slide appropriately along the first concave spherical surface. Therefore, the slidability of the support on the first concave spherical surface can be improved.

[0093] <18> the above <1> ~ <9> In any one of the sliding bearings, the support body is approximately cylindrical in shape and has a first convex spherical surface located on the bottom surface of the support body and sliding against the first concave spherical surface, and a side peripheral surface located on the side surface of the support body, and the first annular ridge line formed by the first convex spherical surface and the side peripheral surface has a curved shape in a cross section including the axis of the support body.

[0094] According to the above configuration, the annular first ridgeline formed by the first convex spherical surface and the side peripheral surface has a curved shape in a cross section including the axis of the support. Here, when the support moves horizontally relative to both the upper shoe and the lower shoe and reaches the vicinity of the outer periphery of the first concave spherical surface, distortion occurs in the outer periphery. Meanwhile, the first ridgeline has a curved shape in a cross section including the central axis of the support. Therefore, distortion occurring in the outer periphery can be suppressed.

[0095] <19> the above <18> In the sliding bearing according to the above, the support body is covered with a friction material, and the friction material is arranged from the first convex spherical surface to the side peripheral surface of the support body and fixed on the side peripheral surface.

[0096] According to the above configuration, the friction material is fixed at the side circumferential surface, which reduces the risk of the friction material peeling off from the support, thereby improving the maintainability of the friction material.

[0097] <20> the above <1> ~ <19> In the sliding bearing according to any one of the above aspects, the upper shoe is characterized by having an annular step portion surrounding the outer periphery of the first concave spherical surface.

[0098] According to the above configuration, the upper shoe has an annular step portion surrounding the outer periphery of the first concave spherical surface. Therefore, when the support body moves freely radially outward relative to the upper shoe and comes into contact with the step portion, the step portion restricts the support body from moving further radially outward. Therefore, the step portion can prevent the support body from jumping out radially outward from the upper shoe 10. [Explanation of symbols]

[0099] 10 Kamikutsu 11 Upper shoe base 12 Concave Surface 13 First recess 16 First Slide 17 1st concave spherical surface 18 flange 19 First fixing member 20 Fixing bolt 21 Connecting bolt 22 Nut 23 Retraction means 24 Fixed part 25 Second fixing member 27 Shimotsutsu 34 Second concave spherical surface 40 Support 41 First convex sphere 42 Second convex spherical surface 43 Side surface 44 Friction material 45 First Fiber 46 Second Fiber 47 First Ridge 48 Second Ridge H superstructure L Substructure G stepped part 100 Sliding bearing

Claims

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; a lower shoe fixed to the lower structure; a support member disposed between the upper shoe and the lower shoe and movable relative to both the upper shoe and the lower shoe in a horizontal direction; The upper shoe has a spherical first concave spherical surface, The lower shoe has a second concave spherical surface. A sliding bearing characterized by:

2. The upper shoe is a first sliding plate having a plate-like shape on which the first concave spherical surface is formed; and an upper shoe base to which the first sliding plate is attached.

2. A sliding bearing according to claim 1, characterized in that it comprises:

3. the upper shoe base has a concave curved surface on which the first sliding plate is attached; The first sliding plate is fixed to the upper shoe base in a shape that follows the concave curved surface of the upper shoe base.

3. A sliding bearing according to claim 2, characterized in that it is

4. A retraction means is provided for retracting and fixing the first sliding plate to the upper shoe base.

4. A sliding bearing according to claim 3, characterized in that it is

5. The retraction means is a nut provided on the rear surface of the first sliding plate; a connecting bolt that is inserted into the upper shoe base from the side opposite to the side where the first sliding plate is provided and engages with the nut, The upper shoe base has a recess formed on the surface on the side where the sliding plate is provided, in which the nut is accommodated, The tip of the connecting bolt is within the thickness range of the nut.

5. A sliding bearing according to claim 4, characterized in that it is

6. The axes of the connecting bolt and the nut are aligned along a normal direction of the first concave spherical surface formed on the first sliding plate.

6. A sliding bearing according to claim 5.

7. The axes of the connecting bolt and the nut are aligned vertically.

6. A sliding bearing according to claim 5.

8. The first sliding plate has a rear surface of the first concave spherical surface that is in contact with the concave curved surface of the upper shoe base.

4. A sliding bearing according to claim 3, characterized in that it is

9. The upper shoe further includes a fixing portion, the first slide plate has an annular flange; The fixing portion fixes the flange to the upper shoe base.

3. A sliding bearing according to claim 2, characterized in that it is

10. the fixing portion includes an annular first fixing member that corresponds to the shape of the flange and is continuous in a circumferential direction of the flange, the first fixing member is fixed to the upper shoe base with the flange sandwiched between the first fixing member and the upper shoe base; 10. A sliding bearing according to claim 9.

11. the fixing portion includes a plurality of second fixing members that are distributed along the circumferential direction of the flange, the second fixing member is fixed to the upper shoe base with the flange sandwiched between the second fixing member and the upper shoe base; 10. A sliding bearing according to claim 9.

12. the first slide plate has an annular flange; The flange is fixed to the upper shoe base by being directly pressed by a fixing bolt.

3. A sliding bearing according to claim 2, characterized in that it is

13. The support is coated with a friction material, The friction material is A first fiber; second fibers having a higher tensile strength and a higher coefficient of friction than the first fibers; It is a double woven fabric formed by 13. A sliding bearing according to any one of claims 1 to 12, characterized in that it comprises:

14. The support has a generally cylindrical shape, a first convex spherical surface located on the bottom surface of the support and sliding against the first concave spherical surface; a side peripheral surface located on a side surface of the support body, the friction material is disposed from the first convex spherical surface of the support body to the side circumferential surface and fixed to the side circumferential surface; 14. A sliding bearing according to claim 13, characterized in that

15. the support body includes a first convex spherical surface that slides on the first concave spherical surface; the first convex spherical surface has a radius of curvature smaller than the radius of curvature of the first concave spherical surface; 13. A sliding bearing according to any one of claims 1 to 12, characterized in that it comprises:

16. a radius of curvature of a portion of the first convex spherical surface is smaller than a radius of curvature of the first concave spherical surface; 16. A sliding bearing according to claim 15, characterized in that

17. the support body includes a first convex spherical surface that slides on the first concave spherical surface; The radius of curvature of the first convex spherical surface is equal to the radius of curvature of the first concave spherical surface.

13. A sliding bearing according to any one of claims 1 to 12, characterized in that it comprises:

18. The support has a generally cylindrical shape, a first convex spherical surface located on the bottom surface of the support and sliding against the first concave spherical surface; a side peripheral surface located on a side surface of the support body, a first annular ridge line formed by the first convex spherical surface and the side circumferential surface has a curved shape in a cross section including an axis of the support body; 13. A sliding bearing according to any one of claims 1 to 12.

19. The support is coated with a friction material, the friction material is disposed from the first convex spherical surface to the side circumferential surface of the support body and is fixed to the side circumferential surface.

19. Sliding bearing according to claim 18, characterized in that

20. The upper shoe has an annular step portion surrounding an outer periphery of the first concave spherical surface.

13. A sliding bearing according to any one of claims 1 to 12, characterized in that it comprises:

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