Spherical sliding bearing

Abstract

To provide a simple structure and high quality sliding bearing. [Solution] The sliding bearing is a sliding bearing disposed between an upper structure and a lower structure facing the upper structure, and comprises an upper shoe fixed to the upper structure, a lower shoe fixed to the lower structure, and a support disposed between the upper shoe and the lower shoe and movable horizontally relative to both the upper shoe and the lower shoe, wherein the upper shoe has a first sliding surface formed in the shape of a concave spherical surface, and the lower shoe has a second sliding surface formed in the shape of a concave spherical surface, and each of the upper shoe and the lower shoe is formed from a single member.

Description

Technical Field

[0001] The present disclosure relates to a spherical sliding bearing.

Background Art

[0002] In Japan, which is a seismic country, various earthquake-resistant technologies, seismic isolation technologies, and seismic control technologies have been developed and applied to various structures such as buildings, bridges, elevated roads, and detached houses. Among them, the seismic isolation technology is a technology that reduces the earthquake force itself entering the structure, so the vibration of the structure during an earthquake is effectively reduced. To outline this seismic isolation technology, a seismic isolation device is interposed between the foundation, which is the lower structure, and the upper structure, reducing the transmission of the vibration of the foundation due to an earthquake to the upper structure, reducing the vibration of the upper structure, and ensuring structural stability. Incidentally, this seismic isolation device not only has an effect during an earthquake but also plays a role in reducing the influence of traffic vibration acting on the structure at all times on the upper structure.

[0003] There are various types of seismic isolation devices, such as laminated rubber bearings with lead plugs, high-damping laminated rubber bearings, devices combining laminated rubber bearings and dampers, and sliding seismic isolation devices. Patent Document 1 discloses a sliding bearing device configured such that a sliding material is disposed slidably on the surface of a sliding plate and interposed between a structure and its supporting structure to support the vertical load of the structure while providing a predetermined sliding resistance to the structure with respect to the supporting structure and supporting it so as to be relatively horizontally displaceable. The sliding bearing device disclosed in Patent Document 1 is a planar sliding seismic isolation device in which the sliding plate is planar.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As a seismic isolation device, a sliding bearing is also known that comprises a shoe having a concave spherical sliding surface and a support that moves relative to the shoe while in contact with the sliding surface. Conventionally, the shoe is formed by fixing a sliding plate, on which the sliding surface is formed, to the base of the shoe. In this case, fixing members such as bolts are required to fix the sliding plate to the base, making the structure complex. Furthermore, although the sliding plate is fixed in a retracted state into the base of the shoe, if the retraction of the sliding plate into the base of the shoe is insufficient, a gap will be created between the sliding plate and the base of the shoe inside the shoe, and problems such as rust may occur in this gap. In this case, the quality of the sliding bearing will be reduced.

[0006] This disclosure aims to provide a spherical sliding bearing with a simple structure and high quality. [Means for solving the problem]

[0007] This disclosure was made to solve the aforementioned problems and proposes the following means. A spherical sliding bearing according to one aspect of the present disclosure is a spherical sliding bearing disposed between a superstructure and a substructure facing the superstructure, comprising: an upper shoe fixed to the superstructure; a lower shoe fixed to the substructure; and a support disposed between the upper shoe and the lower shoe and movable horizontally relative to both the upper shoe and the lower shoe, wherein the upper shoe has a first sliding surface formed in the shape of a concave spherical surface, and the lower shoe has a second sliding surface formed in the shape of a concave spherical surface, and each of the upper shoe and the lower shoe is formed from a single member.

[0008] A sliding bearing according to another aspect of the present disclosure is a spherical sliding bearing disposed between a first structure and a second structure facing the first structure, comprising: a shoe fixed to the first structure; a spherical seat fixed to the second structure; and a support disposed between the shoe and the spherical seat, wherein the shoe has a first sliding surface formed in the shape of a concave sphere; the spherical seat has a second sliding surface formed in the shape of a sphere; and the support comprises a first spherical surface that slides with the first sliding surface and a second spherical surface that slides with the second sliding surface, and the shoe is formed from a single member. [Effects of the Invention]

[0009] According to this disclosure, a spherical sliding bearing with a simple structure and high quality can be provided. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view of a sliding bearing according to the first embodiment of this disclosure. [Figure 2] This is a schematic diagram showing the positional relationship between the first stopper and the support. [Figure 3] This is a schematic diagram showing an example of the structure of the friction material covering the first convex spherical surface. [Figure 4] This is a cross-sectional view of a sliding bearing according to a second embodiment of the present disclosure. [Modes for carrying out the invention]

[0011] <First Embodiment> The sliding bearing 100 according to the first embodiment of this disclosure will be described below with reference to the drawings. Figure 1 is a cross-sectional view of the sliding bearing 100 according to the first embodiment of this disclosure. As shown in Figure 1, the sliding bearing 100 is arranged between a superstructure H and a substructure L facing the superstructure H. The superstructure H and the substructure L have columns made of reinforced concrete or steel, and steel base plates disposed on the upper or lower surface of the columns. The sliding bearing 100 is used, for example, in bridges.

[0012] In this embodiment, the sliding bearing 100 is a double pendulum-type spherical sliding bearing. The sliding bearing 100 comprises an upper shoe 10, a lower shoe 20, and a support 40.

[0013] In the following, the direction along the central axis of the upper shoe 10 is 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 is referred to as the radial direction. Furthermore, the direction that circles around the central axis in the plan view is referred to as the circumferential direction. Furthermore, the radially outer and radially inner directions are defined as follows: In the aforementioned plan view, the side that moves away from the central axis in the radial direction is the radially outer direction. In the aforementioned plan view, the side that moves closer to the central axis in the radial direction is the radially inner direction.

[0014] The upper shoe 10 is fixed to the superstructure H. More specifically, the upper shoe 10 is fixed to the base plate of the superstructure H. The upper shoe 10 is formed from a single component. The material of the upper shoe 10 is, for example, stainless steel.

[0015] The upper shoe 10 has a rectangular shape in plan view. The upper shoe 10 comprises a first sliding surface 11 and a first stopper portion 12. The first sliding surface 11 and the first stopper portion 12 are formed by cutting a rectangular plate-shaped stainless steel material.

[0016] The first sliding surface 11 is formed in the shape of a concave spherical surface. The first sliding surface 11 has a circular shape when viewed from above.

[0017] The first stopper portion 12 is provided on the outside of the first sliding surface 11. The first stopper portion 12 is integrally formed with the upper shoe 10. In other words, the upper shoe 10 has an upper shoe body portion 13 on which the first sliding surface 11 is formed, and a first stopper portion 12 protruding from the upper shoe body portion 13, and the upper shoe body portion 13 and the first stopper portion 12 are integrally formed.

[0018] The first stopper portion 12 suppresses the support 40 from protruding radially outward of the upper sheet 10. For example, the first stopper portion 12 is formed in an annular shape so as to surround the outer peripheral edge of the first sliding surface 11. Note that the first stopper portion 12 only needs to be able to suppress the support 40 from protruding radially outward of the upper sheet 10, and it does not have to be a continuous annular shape. For example, the first stopper portion 12 may be constituted by a plurality of stopper protrusions provided intermittently. Also, the arrangement of the first stopper portion 12 is provided outside the first sliding surface 11, and can be arbitrarily set as long as the first stopper portion 12 can suppress the support 40 from protruding radially outward of the upper sheet 10. For example, in a plan view, the inner peripheral edge of the first stopper portion 12 may be arranged so as to overlap the outer peripheral edge of the first sliding surface 11, or may be arranged outside the outer peripheral edge of the first sliding surface 11.

[0019] As described above, since the first sliding surface 11 and the first stopper portion 12 are formed by cutting a rectangular plate-shaped stainless steel material, the arrangement, shape, etc. of the first sliding surface 11 and the first stopper portion 12 can be freely designed.

[0020] Referring to FIG. 2, the function of the first stopper portion 12 will be described in detail. FIG. 2 is a schematic diagram showing the positional relationship between the first stopper portion 12 and the support 40 that slides radially along the first sliding surface 11. Here, although details will be described later, the support 40 is movable relative to both the upper platen 10 and the lower platen 20 in the horizontal direction. First, as shown in FIG. 2(a), when the support 40 is not moving relatively outward in the radial direction (when it is in the initial position), the support 40 is located outside the drawing and is not approaching the first stopper portion 12. On the other hand, as shown in FIG. 2(b), when the support 40 moves relatively greatly in the radial direction due to an earthquake or the like, the support 40 may contact the first stopper portion 12. Here, the first stopper portion 12 is disposed outside the first sliding surface 11 and has a regulating surface that rises on the side where the center of curvature is located with respect to the first sliding surface 11. Therefore, when the support 40 moves relatively outward in the radial direction and contacts the first stopper portion 12, the first stopper portion 12 regulates the further movement of the support 40 outward in the radial direction. Thus, even if an earthquake of an unexpected scale exceeding the scale assumed at the design stage occurs, it is possible to suppress the support 40 from jumping out to the outside in the radial direction of the upper platen 10.

[0021] Returning to FIG. 1, the lower platen 20 is fixed to the lower structure L. Specifically, the lower platen 20 is fixed to the base plate of the lower structure L. The lower platen 20 is formed of a single member. The material of the lower platen 20 is, for example, stainless steel.

[0022] The lower platen 20 has a rectangular shape in plan view. The lower platen 20 includes a second sliding surface 21 and a second stopper portion 22. The second sliding surface 21 and the second stopper portion 22 are formed by cutting a rectangular plate-shaped stainless steel material.

[0023] The second sliding surface 21 is formed in a concave spherical shape. The second sliding surface 21 is circular in shape when viewed from above. The second stopper portion 22 is provided on the outside of the second sliding surface 21. The second stopper portion 22 is integrally formed with the lower shoe 20. In other words, the lower shoe 20 has a lower shoe body portion 23 on which the second sliding surface 21 is formed, and a second stopper portion 22 that protrudes from the lower shoe body portion 23, and the lower shoe body portion 23 and the second stopper portion 22 are integrally formed. The second stopper portion 22 prevents the support 40 from protruding radially outward from the lower shoe 20. Since the second sliding surface 21 and second stopper portion 22 of the lower shoe 20 correspond to the first sliding surface 11 and first stopper portion 12 of the upper shoe 10, a detailed explanation is omitted.

[0024] The support 40 is approximately cylindrical in shape. Here, "approximately cylindrical in shape" refers to a shape whose outer shape is roughly cylindrical. For example, the approximately cylindrical shape may include a shape in which the bottom or side surface has three-dimensional curvature. As shown in Figure 1, the support 40 is positioned vertically between the upper shoe 10 and the lower shoe 20. The support 40 is horizontally movable relative to both the upper shoe 10 and the lower shoe 20. Therefore, the sliding bearing 100 equipped with the support 40 has a restoring force. As a result, the sliding bearing 100 can self-reset even when an earthquake occurs. Consequently, there is no need to manually return the sliding bearing 100 to its position before the earthquake after an 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 40 is formed from rolled steel for welding (SM490A, B, C, or SN490B, C, or S45C), or stainless steel (SUS), cast steel, cast iron, etc. The support 40 has a surface pressure of 60 N / mm². 2 It has a load-bearing strength of approximately 60 MPa. 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 at which the movement of the support 40 is guaranteed is 120 MPa.

[0025] As shown in Figures 1 and 2, the support 40 comprises a first convex spherical surface 41, a second convex spherical surface 42, and a side circumferential 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 substantially cylindrical support 40. The first convex spherical surface 41 slides against the first sliding surface 11 of the upper shoe 10. As shown in Figure 3, the first convex spherical surface 41 and the second convex spherical surface 42 are covered with friction material 44.

[0026] Here, the values ​​of the radii of curvature of the first convex spherical surface 41 and the first sliding surface 11 are not particularly limited. For example, the first convex spherical surface 41 may have a radius of curvature smaller than that of the first sliding surface 11. Here, when the support 40 moves horizontally relative to both the upper shoe 10 and the lower shoe 20, and the support 40 moves relative to the vicinity of the outer edge of the first sliding surface 11, strain occurs at the outer edge. Therefore, if the first convex spherical surface 41 has a radius of curvature smaller than that of the first sliding surface 11, it is possible to avoid the strain being maximized at the outer edge of the first sliding surface 11. 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 sliding surface 11. In this case, compared to the case where the radius of curvature of the entire first convex spherical surface 41 is smaller than the radius of curvature of the first sliding surface 11, the maximization of strain at the first ridge 47 and the second ridge 48 of the support 40 can be suppressed, and the extreme 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 40 when the support 40 slides can be suppressed. As a result, the frequency of replacement of the friction material 44 can be reduced, and maintainability can be improved. 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 sliding surface 11. In this case, the support 40 can slide appropriately along the first sliding surface 11. Therefore, the sliding properties of the support 40 can be improved.

[0027] The second convex sphere 42 is located on the bottom surface facing the lower shoe 20 in the vertical direction. It slides against the second sliding surface 21 of the lower shoe 20. Furthermore, the relationship between the radius of curvature of the second convex sphere 42 and the radius of curvature of the second sliding surface 21 is the same as the relationship between the radius of curvature of the first convex sphere 41 and the radius of curvature of the first sliding surface 11, so an explanation is omitted here.

[0028] The circumferential surface 43 is located on the side of the substantially cylindrical support 40. More specifically, the circumferential surface 43 extends around the entire circumference of the side of the support 40. The side circumferential surface 43 and the first convex spherical surface 41 form an annular first ridge line 47, and the side circumferential surface 43 and the second convex spherical surface 42 form an annular second ridge line 48. Furthermore, as shown in Figure 2(b), these ridge lines are curved in shape in a cross-section including the central axis of the support 40. Here, when the support 40 moves horizontally relative to both the upper shoe 10 and the lower shoe 20, and the support 40 moves relative to the vicinity of the outer edge of the first sliding surface 11, strain occurs at the outer edge. On the other hand, the first ridge line 47 and the second ridge line 48 are curved in shape in a cross-section including the central axis of the support 40. Therefore, the strain generated at the outer edge can be suppressed.

[0029] The friction material 44 covers the support 40. Specifically, the friction material 44 is arranged from the first convex spherical surface 41 and the second convex spherical surface 42 (sliding surface) of the support 40 to the side circumferential surface 43, covering the support 40. Furthermore, the friction material 44 is fixed to the side circumferential surface 43. Therefore, the risk of the friction material 44 peeling off from the support 40 can be reduced. Thus, the maintainability of the friction material 44 can be improved.

[0030] The method of fixing the friction material 44 to the support 40 is not particularly limited. For example, the friction material 44 may be fixed to the support 40 via an adhesive. Furthermore, for example, the friction material 44 may be fixed to the side surface 43 by an annular fastening band (not shown).

[0031] As described above, the first ridge 47 and the second ridge 48 are curved in shape in the cross-section including the central axis of the support 40. Therefore, in this case, the friction material 44 can be easily placed from the first convex spherical surface 41 to the side circumferential surface 43 and from the second convex spherical surface 42 to the side circumferential surface 43 of the support 40.

[0032] The friction material 44 is a double-woven fabric formed from a first fiber 45 and a second fiber 46. Therefore, compared to the case where the friction material 44 is, for example, a single-woven fabric, the friction material 44 of this embodiment has high surface pressure resistance. Consequently, the support 40 covered by the friction material 44 has high sliding durability. The second fiber 46 has a higher tensile strength than the first fiber 45. Furthermore, the second fiber 46 has a higher coefficient of friction than the first fiber 45. For example, the first fiber 45 may be a PTFE fiber, and the second fiber 46 may be a PPS fiber. Furthermore, for example, the first fiber 45 and the second fiber 46 may be fibers molded from plastic materials. Specifically, the first fiber 45 and the second fiber 46 may be high-strength fibers such as aramid fibers or high-strength, high-density polyethylene fibers.

[0033] Figure 3 is a schematic diagram showing an example of the structure of the friction material 44 covering the first convex spherical surface 41. The structure of the friction material 44 will be described below with reference to Figure 3. As shown in Figure 3, the first fiber 45 comprises a first weft yarn 45a and a first warp yarn 45b. Similarly, the second fiber 46 comprises a second weft yarn 46a and a second warp yarn 46b. The first fiber 45 is positioned more vertically above the first convex sphere 41 than the second fiber 46. The first warp thread 45b of the first fiber 45 is woven in such a way that it wraps around the first weft thread 45a. The second warp thread 46b of the second fiber 46 is woven in such a way that it wraps around the second weft thread 46a. Furthermore, the first warp thread 45b of the first fiber 45 is woven in such a way that it also wraps around the second weft thread 46a of the second fiber 46, which is located vertically below the first warp thread 45b.

[0034] According to the configuration of the sliding bearing 100 of this embodiment described above, the sliding bearing 100 comprises an upper shoe 10 fixed to the upper structure H, a lower shoe 20 fixed to the lower structure L, and a support 40 positioned between the upper shoe 10 and the lower shoe 20, which is horizontally movable relative to both the upper shoe 10 and the lower shoe 20. The upper shoe 10 has a first sliding surface 11 formed in the shape of a concave spherical surface. The lower shoe 20 has a second sliding surface 21 formed in the shape of a concave spherical surface. Each of the upper shoe 10 and the lower shoe 20 is formed from a single member.

[0035] According to the above configuration, each of the upper shoe 10 and the lower shoe 20 is formed from a single component. Therefore, a sliding plate on which the sliding surface is formed is not required for each of the upper shoe 10 and the lower shoe 20. As a result, fixing members such as bolts for fixing the sliding plate to the shoe base are not required, and the structure is simplified. Furthermore, when a shoe is formed by fixing a sliding plate to the shoe base, there is a possibility that problems such as rust may occur in the gap between the sliding plate and the shoe base inside the shoe. However, in this embodiment, the above gap does not occur inside the upper shoe 10 and the lower shoe 20, and the occurrence of rust and other problems inside the upper shoe 10 and the lower shoe 20 can be suppressed. From the above, a sliding bearing 100 with a simple structure and high quality can be obtained.

[0036] Furthermore, in the manufacturing of the upper and lower shoes, if the upper and lower shoes have the aforementioned sliding plates, a mold is required to press-form the sliding plates. However, as mentioned above, since sliding plates are not required for each of the upper shoe 10 and lower shoe 20, a mold is not required. Specifically, each of the upper shoe 10 and lower shoe 20 can be formed, for example, by cutting. This makes it possible to easily adjust the natural period of the sliding bearing 100. That is, the natural period of a sliding bearing is the time it takes for the upper and lower shoes to return to their initial positions after they start moving relative to each other. The natural period of a sliding bearing is determined by the radius of curvature of the sliding surface of the sliding bearing. When the upper and lower shoes have sliding plates, the sliding plates are press-formed using a mold, so the radius of curvature of the sliding surface is determined by the shape of the mold. Therefore, it is difficult to adjust the natural period of the sliding bearing. In this embodiment, the radius of curvature of the sliding surface can be adjusted by forming the upper shoe 10 and the lower shoe 20, for example, by machining, without using a mold, thereby allowing the natural period of the sliding bearing 100 to be freely adjusted. Furthermore, the device size of the sliding bearing 100 and the amount of deformation of the sliding bearing 100 (corresponding to the value obtained by subtracting the size of the support 40 from the device size of the sliding bearing 100) can also be adjusted.

[0037] According to the configuration of the sliding bearing 100 of this embodiment, the material of the upper shoe 10 and the lower shoe 20 is stainless steel. With the above configuration, the entire upper shoe 10 and lower shoe 20 are made of stainless steel. Therefore, it becomes unnecessary to paint the upper shoe 10 and lower shoe 20 for rust prevention.

[0038] According to the configuration of the sliding bearing 100 of this embodiment, the upper shoe 10 is further provided with a first stopper portion 12 on the outside of the first sliding surface 11, and the lower shoe 20 is further provided with a second stopper portion 22 on the outside of the second sliding surface 21. According to the above configuration, when the support 40 moves relative to the first stopper portion 12 and / or the second stopper portion 22 in a radially outward direction and comes into contact with the first stopper portion 12 and / or the second stopper portion 22, the first stopper portion 12 and / or the second stopper portion 22 restrict the support 40 from moving further radially outward. Therefore, even if an earthquake of an unexpected magnitude exceeding the magnitude assumed at the design stage occurs, it is possible to suppress the support 40 from flying radially outward of the upper shoe 10 and the lower shoe 20.

[0039] According to the configuration of the sliding bearing 100 of this embodiment, the first stopper portion 12 is integrally formed with the upper shoe 10, and the second stopper portion 22 is integrally formed with the lower shoe 20. With the above configuration, the number of parts can be reduced compared to the case where the stopper portion is formed separately on the upper shoe and the lower shoe. Furthermore, since the first stopper portion 12 is integrally formed on the upper shoe 10 and the second stopper portion 22 is integrally formed on the lower shoe 20, the strength of the first stopper portion 12 and the second stopper portion 22 can be improved. In addition, the shape (height, width, etc.) of the first stopper portion 12 and the second stopper portion 22, as well as the arrangement of the first stopper portion 12 and the second stopper portion 22, can be freely designed.

[0040] According to the configuration of the sliding bearing 100 of this embodiment, the support 40 is covered with a friction material 44, and the friction material 44 is a double woven fabric formed of a first fiber 45 and a second fiber 46 which has a higher tensile strength and a higher coefficient of friction than the first fiber 45. Therefore, compared to the case where the friction material 44 is, for example, a single woven fabric, the friction material 44 of this embodiment has high surface pressure resistance. Thus, the support 40 covered with the friction material 44 has high sliding durability.

[0041] According to the configuration of the sliding bearing 100 of this embodiment, the support 40 is substantially cylindrical in shape and comprises a first convex spherical surface 41 located on the bottom surface of the support 40 and sliding against the first sliding surface 11, and a side circumferential surface 43 located on the side surface of the support 40, the first convex spherical surface 41 being covered with a friction material 44. The friction material 44 is arranged from the first convex spherical surface to the side circumferential surface 43 of the support 40 and fixed at the side circumferential surface 43. Therefore, the risk of the friction material 44 peeling off from the support 40 can be reduced. Thus, the maintainability of the friction material 44 can be improved.

[0042] According to the configuration of the sliding support 100 of this embodiment, the support 40 includes a first convex spherical surface 41 that slides on the first sliding surface 11, and the first convex spherical surface 41 has a radius of curvature smaller than the radius of curvature of the first sliding surface 11. Here, the support 40 moves horizontally relative to both the upper shoe 10 and the lower shoe 20, and when the support 40 moves relative to the vicinity of the outer edge of the first sliding surface 11, strain occurs at the outer edge. Therefore, if the first convex spherical surface 41 has a radius of curvature smaller than the radius of curvature of the first sliding surface 11, it is possible to avoid the strain maximization at the outer edge of the first sliding surface 11.

[0043] In 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 sliding surface 11. In this case, compared to the case where 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 sliding surface 11, the maximization of strain at the first ridge 47 and the second ridge 48 of the support 40 can be suppressed, and the extreme 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 40 when the support 40 slides can be suppressed. Therefore, the frequency of replacement of the friction material 44 can be reduced, and maintainability can be improved.

[0044] According to the configuration of the sliding bearing 100 of this embodiment, the support 40 is substantially cylindrical in shape and comprises a first convex spherical surface 41 located on the bottom surface of the support 40 and sliding against the first sliding surface 11, and a side circumferential surface 43 located on the side surface of the support 40. The annular first ridge line 47 formed by the first convex spherical surface 41 and the side circumferential surface 43 has a curved shape in the 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 20, and the support 40 moves relative to the vicinity of the outer edge of the first sliding surface 11, strain occurs at the outer edge. On the other hand, the first ridge line 47 has a curved shape in the cross-section including the central axis of the support 40. Therefore, the strain that occurs at the outer edge can be suppressed.

[0045] <Second Embodiment> Next, with reference to Figure 4, a sliding bearing 200 according to a second embodiment of the present disclosure will be described. Figure 4 is a cross-sectional view of the sliding bearing 200 according to a second embodiment of the present disclosure. As shown in Figure 4, the sliding bearing 200 is positioned between a first structure B1 and a second structure B2 facing the first structure B1. In the illustrated example, the first structure B1 is the superstructure and the second structure B2 is the substructure. However, the first structure B1 may be the substructure and the second structure B2 may be the superstructure. The sliding bearing 200 is used, for example, in a bridge.

[0046] In this embodiment, the sliding bearing 200 is a single-pendulum type spherical sliding bearing. The sliding bearing 200 comprises a shoe 60, a spherical seat portion 70, and a support 80.

[0047] The shoe 60 is fixed to the first structure B1. The shoe 60 is formed from a single component. The material of the shoe 60 is, for example, stainless steel.

[0048] The shoe 60 has a rectangular shape in plan view. The shoe 60 comprises a first sliding surface 61 and a stopper portion 62. The first sliding surface 61 and the stopper portion 62 are formed by cutting a rectangular plate-shaped stainless steel material.

[0049] The first sliding surface 61 is formed in a concave spherical shape. The first sliding surface 61 is circular in shape when viewed from above. The stopper portion 62 is provided on the outside of the first sliding surface 61. The stopper portion 62 is integrally formed with the shoe 60. In other words, the shoe 60 has a shoe body portion 63 on which the first sliding surface 61 is formed, and a stopper portion 62 that protrudes from the shoe body portion 63, and the shoe body portion 63 and the stopper portion 62 are integrally formed. The stopper portion 62 prevents the support 80 from protruding radially outward from the shoe 60. Since the first sliding surface 61 and stopper portion 62 of the shoe 60 have the same configuration as the first sliding surface 11 and first stopper portion 12 of the upper shoe 10 in the first embodiment, a detailed explanation will be omitted.

[0050] The spherical seat portion 70 is fixed to the second structure B2. The spherical seat portion 70 has a second sliding surface 71 that is formed in a spherical shape. The second sliding surface 71 is a concave recessed sliding surface provided above the spherical seat portion 70.

[0051] The support 80 is positioned between the shoe 60 and the spherical seat portion 70. The support 80 comprises a first spherical surface 81 and a second spherical surface 82. The first spherical surface 81 faces the shoe 60 in the vertical direction and is a convex spherical surface that slides against the first sliding surface 61 of the shoe 60. The second spherical surface 82 is a convex spherical sliding surface provided below the support 80 and slides against the second sliding surface 71 of the spherical seat portion 70. The first spherical surface 81 and the second spherical surface 82 may be covered with a friction material. In this case, the friction material may have the same configuration as the friction material 44 in the first embodiment.

[0052] According to the configuration of the sliding bearing 200 of this embodiment described above, the sliding bearing 200 comprises a shoe 60 fixed to the first structure B1, a spherical seat portion 70 fixed to the second structure B2, and a support 80 disposed between the shoe 60 and the spherical seat portion 70. The shoe 60 has a first sliding surface 61 formed in the shape of a concave spherical surface. The spherical seat portion 70 has a second sliding surface 71 formed in the shape of a spherical surface. The support 80 comprises a first spherical surface 81 that slides with the first sliding surface 61, and a second spherical surface 82 that slides with the second sliding surface 71. The shoe 60 is formed from a single member.

[0053] According to the above configuration, the shoe 60 is formed from a single component. Therefore, a sliding plate on which the sliding surface is formed is unnecessary in the shoe 60. As a result, fixing members such as bolts for fixing the sliding plate to the shoe base are unnecessary, and the structure is simplified. Furthermore, when a shoe is formed by fixing a sliding plate to the shoe base, there is a possibility that problems such as rust may occur in the gap between the sliding plate and the shoe base inside the shoe. However, in this embodiment, the above gap does not occur inside the shoe 60, and the occurrence of rust and other problems inside the shoe 60 can be suppressed. From the above, a sliding bearing 200 with a simple structure and high quality can be obtained.

[0054] Furthermore, the shoe 60 can be formed, for example, by machining. This makes it easier to adjust the natural period of the sliding bearing 200. It also allows for adjustment of the device size of the sliding bearing 200 and the amount of deformation of the sliding bearing 200.

[0055] The technical scope of this disclosure is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of this disclosure.

[0056] For example, in the first embodiment, the lower shoe 20 was described as having a configuration corresponding to the upper shoe 10, but this is not limited to this. For example, the lower shoe 20 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 20 may have a configuration corresponding to the upper shoe 10 described in the first embodiment, while the upper shoe 10 may have a configuration different from the configuration described in the first embodiment and may not correspond to the lower shoe 20.

[0057] Furthermore, for example, the radius of curvature of the first convex spherical surface 41 on the support 40 may be equal to the radius of curvature of the first sliding surface 11. In this case, the support 40 can slide appropriately along the first sliding surface 11. Therefore, the sliding properties of the support 40 on the first sliding surface 11 can be improved.

[0058] The shape of the support 40 does not have to be approximately cylindrical. For example, the support 40 may be a rectangular prism, a sphere, or the like. Furthermore, the support 40 does not necessarily have to be covered with the friction material 44. For example, a portion of the support 40 may be covered with the friction material 44. Also, if the support 40 is covered with the friction material 44, the friction material 44 may be arranged only on the sliding surface of the support 40.

[0059] Furthermore, the upper shoe 10 does not necessarily have to be equipped with the first stopper portion 12 described above. In this case, for example, the radius of curvature of the peripheral portion of the first sliding surface 11 may be made smaller than the radius of curvature of the portion other than the peripheral portion to prevent the support 40 from protruding radially outward from the upper shoe 10.

[0060] In the second embodiment, the second sliding surface 71 was described as a concave, recessed sliding surface and the second spherical surface 82 as a convex, spherical sliding surface, but the embodiment is not limited to this. For example, the second sliding surface 71 may be a convex, spherical sliding surface and the second spherical surface 82 may be a concave, recessed sliding surface.

[0061] Furthermore, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of this disclosure.

[0062] (Note) <1> A sliding bearing according to one aspect of the present disclosure is a sliding bearing disposed between a superstructure and a substructure facing the superstructure, comprising: an upper shoe fixed to the superstructure; a lower shoe fixed to the substructure; and a support disposed between the upper shoe and the lower shoe and movable horizontally relative to both the upper shoe and the lower shoe, wherein the upper shoe has a first sliding surface formed in the shape of a concave spherical surface, and the lower shoe has a second sliding surface formed in the shape of a concave spherical surface, and each of the upper shoe and the lower shoe is formed from a single member.

[0063] According to the above configuration, the upper and lower shoes are each formed from a single component. Therefore, a sliding plate on which the sliding surface is formed is not required in each of the upper and lower shoes. As a result, fixing members such as bolts for fixing the sliding plate to the shoe base are not required, and the structure is simplified. Furthermore, when a shoe is formed by fixing a sliding plate to the shoe base, there is a possibility that problems such as rust may occur in the gap between the sliding plate and the shoe base inside the shoe. However, in this disclosure, the above gap does not occur inside the upper and lower shoes, and the occurrence of rust and other problems inside the upper and lower shoes can be suppressed. From the above, a sliding bearing with a simple structure and high quality can be obtained.

[0064] <2> the above <1> In the sliding bearing relating to the above, the material of the upper shoe and the lower shoe is stainless steel.

[0065] With the above configuration, the entire upper and lower shoe is made of stainless steel. Therefore, it becomes unnecessary to paint the upper and lower shoes for rust prevention.

[0066] <3> the above <1> or <2> In the sliding bearing relating to the above, the upper shoe further comprises a first stopper portion on the outside of the first sliding surface, and the lower shoe further comprises a second stopper portion on the outside of the second sliding surface.

[0067] According to the above configuration, when the support moves radially outward relative to the first stopper and / or the second stopper, the first stopper and / or the second stopper restrict the support from moving further radially outward. Therefore, even if an earthquake of an unexpected magnitude exceeding the scale assumed during the design phase occurs, it is possible to suppress the support from flying radially outward from the upper and lower shoes.

[0068] <4> the above <3> In the sliding bearing relating to the above, the first stopper portion is integrally formed with the upper shoe, and the second stopper portion is integrally formed with the lower shoe.

[0069] With the above configuration, the number of parts can be reduced compared to the case where the stopper portion is formed separately on the upper and lower shoe. Furthermore, since the first stopper portion is integrally formed on the upper shoe and the second stopper portion is integrally formed on the lower shoe, the strength of the first and second stopper portions can be improved. In addition, the shape (height, width, etc.) of the first and second stopper portions and their arrangement can be freely designed.

[0070] <5> the above <1> ~ <4> In a sliding bearing relating to any of the above, the support is covered with a friction material, the friction material being a double fabric formed of a first fiber and a second fiber having a higher tensile strength and a higher coefficient of friction than the first fiber.

[0071] According to the above configuration, the support is covered with a friction material, and the friction material is a double woven fabric formed of a first fiber and a second fiber having higher tensile strength and a higher coefficient of friction than the first fiber. Therefore, compared to the case where the friction material is, for example, a single woven fabric, the friction material of this embodiment has high surface pressure resistance. Thus, the support covered with the friction material has high sliding durability.

[0072] <6> the above <7> In the sliding bearing relating to the above, the support is substantially cylindrical in shape and comprises a first convex spherical surface located on the bottom surface of the support and sliding against the first sliding surface, and a side surface located on the side of the support, and the friction material is disposed from the first convex spherical surface to the side surface of the support and is fixed on the side surface.

[0073] According to the above configuration, the friction material is fixed to the side surface. Therefore, the risk of the friction material peeling off from the support can be reduced. Thus, the maintainability of the friction material can be improved.

[0074] <7> the above <1> ~ <6> In a sliding bearing according to any one embodiment thereof, the support body comprises a first convex spherical surface that slides against the first sliding surface, and the first convex spherical surface has a radius of curvature smaller than the radius of curvature of the first sliding surface.

[0075] According to the above configuration, the first convex spherical surface has a radius of curvature smaller than the radius of curvature of the first sliding surface. Here, the support moves horizontally relative to both the upper and lower shoes, and when the support moves relative to the vicinity of the outer edge of the first sliding surface, strain occurs at the outer edge. Therefore, if the first convex sphere has a radius of curvature smaller than the radius of curvature of the first sliding surface, it is possible to avoid the strain maximization at the outer edge of the first sliding surface.

[0076] <8> the above <7> In the sliding bearing relating 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 sliding surface.

[0077] According to the above configuration, the radius of curvature of a portion of the first convex sphere is smaller than the radius of curvature of the first sliding surface. In this case, compared to the case where the radius of curvature of the entire first convex sphere is smaller than the radius of curvature of the first sliding surface, the maximization of strain at the first and second edges of the support can be suppressed, and the extreme wear of the friction material at the edges of the first and second convex spheres of the support can be suppressed when the support slides. Therefore, the frequency of friction material replacement can be reduced, and maintainability can be improved.

[0078] <9> the above <1> ~ <8> In a sliding bearing according to any one embodiment thereof, the support comprises a first convex spherical surface that slides against the first sliding surface, wherein the radius of curvature of the first convex spherical surface is equal to the radius of curvature of the first sliding surface.

[0079] 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 sliding surface. In this case, the support can slide appropriately along the first sliding surface. Therefore, the sliding properties of the support on the first sliding surface can be improved.

[0080] <10> the above <1> ~ <9> In a sliding bearing according to any one embodiment of the above, the support is substantially cylindrical in shape and comprises a first convex spherical surface located on the bottom surface of the support and sliding on the first sliding surface, and a side circumferential surface located on the side surface of the support, wherein the annular first ridge line formed by the first convex spherical surface and the side circumferential surface has a curved shape in a cross-section including the axis of the support.

[0081] According to the above configuration, the first annular ridge formed by the first convex spherical surface and the side circumferential surface has a curved shape in the cross-section including the axis of the support. Here, when the support moves horizontally relative to both the upper and lower shoes, and the support moves relative to the vicinity of the outer edge of the first sliding surface, strain occurs at the outer edge. On the other hand, the first ridge has a curved shape in the cross-section including the central axis of the support. Therefore, the strain generated at the outer edge can be suppressed.

[0082] <11> the above <10> In the sliding bearing relating to the above, the support is covered with a friction material, the friction material is arranged from the first convex spherical surface of the support to the side circumferential surface, and is fixed on the side circumferential surface.

[0083] According to the above configuration, the friction material is fixed to the side surface. Therefore, the risk of the friction material peeling off from the support can be reduced. Thus, the maintainability of the friction material can be improved.

[0084] <12> A sliding bearing according to another aspect of the present disclosure is a sliding bearing disposed between a first structure and a second structure facing the first structure, comprising: a shoe fixed to the first structure; a spherical seat fixed to the second structure; and a support disposed between the shoe and the spherical seat, wherein the shoe has a first sliding surface formed in the shape of a concave sphere; the spherical seat has a second sliding surface formed in the shape of a sphere; and the support comprises a first spherical surface that slides with the first sliding surface and a second spherical surface that slides with the second sliding surface, and the shoe is formed from a single member.

[0085] According to the above configuration, the shoe is formed from a single component. Therefore, a sliding plate on which the sliding surface is formed is unnecessary in the shoe. As a result, fixing members such as bolts for fixing the sliding plate to the shoe base are unnecessary, and the structure is simplified. Furthermore, when a shoe is formed by fixing a sliding plate to the shoe base, there is a possibility that problems such as rust may occur in the gap between the sliding plate and the shoe base inside the shoe. However, in this disclosure, such a gap does not occur inside the shoe, and the occurrence of rust inside the shoe can be suppressed. From the above, a sliding bearing with a simple structure and high quality can be obtained. [Explanation of symbols]

[0086] 10 Kamikutsu 11 First sliding surface 12. First stopper section 20 Lower shoe 21 Second sliding surface 22. Second stopper section 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 60 Shoes 61 First sliding surface 62 Stopper part 70 Ball seat part 71 Second sliding surface 80 Support 81 1st sphere 82 Second sphere 100, 200 sliding bearings H superstructure L Substructure B1 1st structure B2 Second structure

Claims

1. A spherical sliding bearing disposed between a superstructure and a lower structure facing the superstructure, An upper shoe fixed to the aforementioned superstructure, A lower shoe fixed to the aforementioned lower structure, The device comprises a support positioned between the upper shoe and the lower shoe, and which is horizontally movable relative to both the upper shoe and the lower shoe, The upper shoe is provided with a first sliding surface formed in the shape of a concave spherical surface, The lower shoe is provided with a second sliding surface formed in the shape of a concave spherical surface, Each of the upper shoe and the lower shoe is formed from a single component. Spherical sliding bearing.

2. The material of the upper shoe and the lower shoe is the same, and that material is stainless steel. The spherical sliding bearing according to claim 1.

3. The upper shoe further comprises a first stopper portion on the outside of the first sliding surface, The lower shoe further comprises a second stopper portion on the outside of the second sliding surface. The spherical sliding bearing according to claim 1.

4. The first stopper portion is integrally formed with the upper shoe, The second stopper portion is integrally formed with the lower shoe. The spherical sliding bearing according to claim 3.

5. The aforementioned support is covered with a friction material, The aforementioned friction material is First fiber and A second fiber having higher tensile strength and a higher coefficient of friction than the first fiber, It is a double-woven fabric formed by the following: A spherical sliding bearing according to any one of claims 1 to 4.

6. The support is substantially cylindrical in shape. A first convex spherical surface located on the bottom surface of the support and sliding against the first sliding surface, The side surface located on the side of the support, Equipped with, The friction material is arranged from the first convex spherical surface of the support to the side circumferential surface and is fixed on the side circumferential surface. The spherical sliding bearing according to claim 5.

7. The support comprises a first convex spherical surface that slides against the first sliding surface, The first convex spherical surface has a radius of curvature smaller than the radius of curvature of the first sliding surface. A spherical sliding bearing according to any one of claims 1 to 4.

8. The radius of curvature of a portion of the first convex spherical surface is smaller than the radius of curvature of the first sliding surface. The spherical sliding bearing according to claim 7.

9. The support comprises a first convex spherical surface that slides against the first sliding surface, The radius of curvature of the first convex spherical surface is equal to the radius of curvature of the first sliding surface. A spherical sliding bearing according to any one of claims 1 to 4.

10. The support is substantially cylindrical in shape. A first convex spherical surface located on the bottom surface of the support and sliding against the first sliding surface, The support comprises a side surface located on the side surface, The first annular ridge formed by the first convex spherical surface and the side circumferential surface has a curved shape in a cross-section including the axis of the support. A spherical sliding bearing according to any one of claims 1 to 4.

11. The aforementioned support is covered with a friction material, The friction material is arranged from the first convex spherical surface to the side circumferential surface of the support and is fixed on the side circumferential surface. The spherical sliding bearing according to claim 10.

12. A spherical sliding bearing disposed between a first structure and a second structure facing the first structure, A shoe fixed to the first structure, A spherical seat fixed to the second structure, The device comprises a support positioned between the shoe and the ball seat, The shoe is provided with a first sliding surface formed in the shape of a concave spherical surface, The aforementioned spherical seat portion includes a second sliding surface formed in a spherical shape, The support comprises a first spherical surface that slides against the first sliding surface and a second spherical surface that slides against the second sliding surface. The shoe is formed from a single member. Spherical sliding bearing.

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