Bearing device

Abstract

To provide a bearing device which does not damage a sliding first shoe even when a step appears at a boundary between sliding plates in a second shoe.SOLUTION: A bearing device is composed of an upper shoe 10 and an expansion lower shoe 20 disposed in opposite parts in an upper structure 200 and a lower structure 300. In an opposite part to the upper shoe 10 in the expansion lower shoe 20, a plurality of sliding plates 23, 33 composing a lower shoe sliding surface 20a are arranged side by side. In the sliding plate 33, an area R33 within a prescribed range from an end edge 42a on the side of the boundary part 42 between the adjacent other sliding plates 23 is an end area 35a. The one side sliding plate 33 on one side of the adjacent sliding plates 23, 33 is installed so as to be as high as or higher than a lower shoe sliding surface 23a of the other side sliding plate 23 a lower shoe sliding surface 33a has on the other side. The expansion lower shoe 20 is provided with high deformation means 35a by which at least an end area 35a of one side sliding plate 33 becomes larger than the other area 37a and deformable.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a support device that is interposed between, for example, a first structure and a second structure, and supports the first structure while sliding relative to the second structure. [Background technology]

[0002] For example, bearing devices that allow a first structure, acting as a supported structure, to slide against a second structure, acting as a supporting structure, are used between bridge piers and upper bridges, between buildings and walkways that connect buildings, between heavy tanks and platforms such as those in oil plants, or between roof beams supported by columns.

[0003] For example, the bearing device described in Patent Document 1 is configured with a first shoe fixed to the first structure side and a second shoe arranged on the second structure side. The first shoe is equipped with a sliding material, and the second shoe is equipped with a sliding plate, with sliding surfaces formed on opposing portions of the sliding material and the sliding plate being configured to slide against each other. The second shoe described in Patent Document 1 has a sliding surface larger than that of the first shoe so that it can support the sliding first shoe during an earthquake.

[0004] However, assuming that the first shoe slides against the second shoe with an extremely large amplitude, as occurs in a major earthquake, the second shoe needs to have a wider sliding surface along the sliding direction. However, due to manufacturing and transportation constraints, it is difficult to form a wide sliding surface continuously along the sliding direction that can withstand a major earthquake.

[0005] For this reason, it is possible to expand the sliding surface of the second shoe by arranging multiple sliding plates side by side, but this can create steps at the boundaries between the multiple sliding plates, which can cause the first shoe sliding on the sliding surface of the second shoe to pass over the steps at the boundaries and be damaged, resulting in a decrease in sliding performance. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-148106 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, an object of the present invention is to provide a bearing device that prevents damage to the sliding first shoe even if a step occurs at the boundary between the sliding plates of the second shoe. [Means for solving the problem]

[0008] This invention is a bearing device comprising the first shoe and the second shoe arranged at opposing portions of a first structure and a second structure, wherein the sliding surfaces at the opposing portions of the first shoe and the second shoe slide against each other, wherein a plurality of sliding plates constituting the second sliding surface, which is the sliding surface of the second shoe, are arranged side by side at the portion of the second shoe facing the first shoe, wherein a region of a predetermined range from the edge on the side of the boundary with another adjacent sliding plate is defined as an end region, one of the adjacent sliding plates is defined as a one-side sliding plate, and the other of the adjacent sliding plates is defined as the other-side sliding plate, wherein the one-side sliding plate is installed so that the second sliding surface is at the same height or higher than the second sliding surface of the other-side sliding plate, and wherein the second shoe is provided with the high deformation means which allows at least the end region of the one-side sliding plate to deform more than other regions.

[0009] The high deformation means may cause the end region to undergo, for example, flexural deformation or compressive deformation, if the amount of deformation of the end region in response to the load from the first shoe is greater than that of the other regions of the sliding plate other than the end region, and if the end region undergoes compressive deformation, the end region may undergo either elastic deformation or plastic deformation.

[0010] The high deformation means may be provided only on the side of the one side sliding plate of a pair of adjacent sliding plates, but this is not limited to this and, for example, it may be provided on both the one side sliding plate and the other side sliding plate.

[0011] Furthermore, when the high deformation means is provided on the side of the one sliding plate, it is sufficient that it is provided at least in the end region, and for example, it may be provided on the entire one sliding plate excluding the other region. Similarly, when the high deformation means is provided on the side of the other sliding plate, it is sufficient that it is provided at least in the end region of the other side, and for example, it may be provided on the entire other sliding plate excluding the other region.

[0012] According to this invention, the sliding surface of the second shoe is expanded by arranging a plurality of the sliding plates in parallel at the portion of the second shoe facing the first shoe. Therefore, even when the first shoe slides against the second shoe with an extremely large amplitude, such as during a major earthquake, the second shoe can support the first shoe in response to the amplitude of the major earthquake.

[0013] As described above, since the first sliding plate is installed so that the second sliding surface is at the same height or higher than the second sliding surface of the second sliding plate, when the second sliding surfaces of the first sliding plate and the second sliding plate are at the same height, the boundary between them is flat. On the other hand, when the second sliding surface of the first sliding plate is higher than the second sliding surface of the second sliding plate, a step occurs at the boundary between them.

[0014] Furthermore, as described above, even if a step occurs at the boundary, the second shoe is equipped with the high deformation means, so when the first shoe passes through the boundary between the second shoe sliding surfaces of each of a pair of adjacent sliding plates, the end region of the one side sliding plate can deform in response to the load received from the first shoe sliding surface.

[0015] This eliminates a step formed by the edge of the end region on the boundary side at the boundary portion, so that when the sliding surface of the first shoe passes through the boundary portion between the sliding surfaces of the second shoes, the sliding surface of the first shoe can make surface contact with the end region, thereby mitigating the concentration of a local load on the sliding surface of the first shoe, which occurs when the sliding surface makes line contact along a step, for example.

[0016] Therefore, even if a step occurs at the boundary between the second shoe sliding surfaces of each of a pair of adjacent sliding plates, damage to the first shoe when the first shoe passes over the step can be suppressed, and the desired sliding performance can be ensured.

[0017] As an aspect of the present invention, a fixing member for fixing the sliding plate is provided on the second shoe on the opposite side of the second sliding surface in the axial compression direction by the first shoe, and the high deformation means may be a gap provided between at least the end region of the sliding plate and the fixing member facing the end region, allowing flexural deformation of the end region toward the fixing member.

[0018] It is preferable that the amount of deformation of the high deformation means, which deforms under the load from the first shoe, is an amount of deformation that can eliminate a step formed by the end of the end region on the boundary side. For this reason, it is preferable that the gap that allows the high deformation means to deform is a gap that is larger in the axial compression direction by the first shoe than the height of the step, i.e., the difference in height between the end region of the one side sliding plate (also referred to as "one side end region") and the end region of the other side sliding plate (also referred to as "other side end region") and the second shoe sliding surface.

[0019] According to this invention, the bending deformation caused by the load from the first shoe toward the fixing member facing the end region is not restricted by the fixing member, and the bending deformation can be reliably caused in the gap. Therefore, when the first shoe passes through the boundary between the second shoe sliding surfaces of each of the adjacent pairs of sliding plates, damage to the first shoe due to the step at the boundary can be prevented, and the desired sliding performance can be ensured.

[0020] As another aspect of the present invention, the high deformation means may be formed of a resin having higher deformability than a constituent material of the other region of the one-side sliding plate. This invention allows the end region to deform toward the fixed member in response to the load from the first shoe, so even if a step occurs at the boundary between the second shoe sliding surfaces of each of a pair of adjacent sliding plates when the first shoe passes over the boundary, damage to the first shoe can be suppressed and desired sliding performance can be ensured.

[0021] As another aspect of the present invention, the high deformation means may be formed of rubber that is elastically deformable toward a fixing member that fixes the sliding plate in response to a load from the first shoe. Suitable examples of the rubber include natural rubber, butadiene rubber, urethane rubber, nitrile rubber, ethylene-propylene rubber, silicone rubber, fluororubber, and other synthetic rubbers, and silicone. The rubber may also be a synthetic resin as long as it is elastically deformable.

[0022] Furthermore, according to the present invention, the end region can be elastically deformed toward the fixed member in response to the load from the first shoe. Therefore, when the first shoe passes over the boundary between the second shoe sliding surfaces of each of the pair of adjacent sliding plates, damage due to a step at the boundary can be suppressed, and desired sliding performance can be ensured.

[0023] As an aspect of this invention, the end portion located at the boundary portion of the end region of the one side sliding plate may be chamfered into a curved surface that is gentler than an inclined surface chamfer, such that the corner formed by the end face on the boundary portion side and the second sliding surface is chamfered into a curved surface that is gentler than an inclined surface chamfer.

[0024] According to this invention, by making the corner of the end portion located at the boundary portion of the end region of the one-side sliding plate arc-shaped, the step formed by the end portion can be made arc-shaped, and when the sliding surface of the first shoe passes through the boundary portion between the sliding surfaces of the second shoes, the application of local load when the sliding surface of the first shoe comes into contact with the end region can be alleviated.

[0025] In another aspect of the present invention, the sliding plate comprises a main body side sliding plate that is in contact with a first sliding surface, which is the sliding surface of the first shoe, under normal circumstances, and an extension side sliding plate that extends outward relative to the main body side sliding plate in the sliding direction of the first shoe, and the one side sliding plate is the extension side sliding plate and the other side sliding plate is the main body side sliding plate, and the fixing members that fix the sliding plates comprise a main body side fixing member that fixes the main body side sliding plate and an extension side fixing member that fixes the extension side sliding plate, and in the sliding direction, the main body side fixing member and the extension side fixing member The boundary between the main body side sliding plate and the extension side sliding plate is defined as the fixed side boundary, and in the extension side sliding plate, a region within a predetermined range from the edge on the side of the boundary between the main body side sliding plate and the extension side sliding plate adjacent thereto is defined as the extension side end region, and in the sliding direction, the edge on the side of the boundary between the main body side sliding plate and the extension side sliding plate is formed to be retreated to the side opposite the extension side fixing member relative to the fixed side boundary, and a protrusion is formed in the extension side end region that protrudes beyond the fixed side boundary to the side of the end of the main body side sliding plate, and the high deformation means may be provided in the protrusion.

[0026] According to this invention, even when the second shoe is arranged with the extension side sliding plate next to the existing main body side sliding plate to expand the second sliding surface, the step between the arranged second sliding surfaces can be eliminated. [Effects of the Invention]

[0027] According to the present invention, it is possible to provide a bearing device in which the sliding first shoe is not damaged even if a step occurs at the boundary between the sliding plates of the second shoe. [Brief explanation of the drawings]

[0028] [Figure 1] Schematic cross-sectional view of a bearing device. [Figure 2] FIG. 4 is an exploded perspective view of the sliding portion of the upper shoe as viewed from the bottom side (upper shoe sliding surface). [Figure 3] A perspective view of the lower shoe from above. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] 3(a) is a cross-sectional view of the main part taken along line AA in FIG. 3(a), (b) is an enlarged view of part Ra in FIG. 6(a), and (c) is an explanatory diagram of the operation of the high deformation means in FIG. 6(a). [Figure 7] 3(a) is a cross-sectional view of the main part taken along the line BB in FIG. 3(a), (b) is an enlarged view of the Rb part in FIG. 7(a), and (c) is an explanatory diagram of the operation of the high deformation means in FIG. 7(a). [Figure 8] 3(a) is a cross-sectional view of the main part taken along line CC in FIG. 3(a), (b) is an enlarged view of the Rc part in FIG. 8(a), and (c) is an explanatory diagram of the operation of the high deformation means in FIG. 8(a). [Figure 9] FIG. 10 is a plan view of an enlarged lower shoe provided in a bearing device of another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0029] An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows a schematic cross-sectional view of the bearing device 1, Figure 2 shows an exploded oblique view of the sliding part of the upper shoe as seen from the bottom side (upper shoe sliding surface), Figure 3 shows an oblique view of the bearing device as seen from above, Figure 4 shows an exploded oblique view of the bearing device as seen from above, and Figure 5 shows an exploded oblique view of the bearing device as seen from below.

[0030] Figure 6(a) shows a cross-sectional view of the main part along line AA in Figure 3, Figure 6(b) shows an enlarged view of part Ra in Figure 6(a), and Figure 6(c) shows an explanatory diagram of the action of the inner end region 35a as a high deformation means when the slide bearing 12 is slid on the lower shoe sliding surface 20a in Figure 6(a) and passes through the boundary portion 42.

[0031] Figure 7(a) shows a cross-sectional view of the main part along line BB in Figure 3, Figure 7(b) shows an enlarged view of part Rb in Figure 7(a), and Figure 7(c) shows an explanatory diagram of the action of one side end region 35b as a high deformation means when the slide bearing 12 is slid on the lower shoe sliding surface 20a in Figure 7(a) and passes through the boundary part 41.

[0032] Fig. 8(a) shows a cross-sectional view of the main part taken along line CC in Fig. 3, Fig. 8(b) shows an enlarged view of part Rc in Fig. 7(a), and Fig. 8(c) shows an explanatory diagram of the operation in the case where the high deformation means is the gap 36 that allows flexural deformation of the other-side end region 35c when the slide bearing 12 is slid on the lower shoe sliding surface 20a and passes through the boundary portion 41 in Fig. 7(a). Note that in Fig. 3, the upper shoe 10 is shown by a virtual line.

[0033] The bearing device 1 is a seismic isolation device arranged between the upper structure 200 and the lower structure 300 that make up the seismic isolation structure 100, and is composed of an upper shoe 10 fixed to the upper structure 200 and an expandable lower shoe 20 fixed to the lower structure 300, and the boundary surface between the upper shoe 10 and the expandable lower shoe 20, i.e., the sliding surfaces (10a, 20a), slide, thereby providing support that allows for displacement in the in-plane direction at the boundary surface (sliding surface), and can absorb vibration energy caused by, for example, earthquakes or strong winds, thereby providing seismic isolation.

[0034] As shown in FIG. 1, the bearing device 1 is composed of an upper shoe 10 fixed to the bottom surface 200 a of the upper structure 200 and an expandable lower shoe 20 fixed to the top surface 300 a of the lower structure 300 .

[0035] The upper shoe 10 comprises a steel base pot 11 fixed to the bottom surface of the upper structure, and a sliding part 60 having a circular shape in plan view and arranged in a mounting recess 13a in the center of the bottom side of the base pot 11.

[0036] The base pot 11 is integrally formed with an attachment portion 12 fixed to the bottom surface 200a of the upper structure 200 and a cylindrical pedestal portion 13 protruding downward from the attachment portion 11a. The mounting recess 13 a is a cylindrical space that is open on the lower side of the base 13 , that is, that is open toward the expandable lower shoe 20 .

[0037] The sliding part 60 mounted in the mounting recess 13a of the base part 13 in the base pot 11 is composed of, from top to bottom, an elastic plate 61, a shim 62, a seal ring 63, a piston 64 and a slide bearing 65, as shown in Figures 1 and 2. The elastic plate 61 is a rubber plate having a circular shape in plan view and having approximately the same diameter as the inner diameter of the cylindrical mounting recess 13a.

[0038] The shim 62 has a circular shape in plan view and has the same diameter as the elastic plate 61, and is a thin plate made of a fluororesin such as polytetrafluoroethylene (PTFE). The seal ring 63 is a circular ring with a trapezoidal cross section, in which the outer side is a vertical surface and the inner side is an inclined surface that slopes downward toward the outer side, and its outer diameter is the same as that of the elastic plate 61 and the shim 62.

[0039] The piston 64 is made of stainless steel and has a generally cylindrical shape, with a circular recess 64a formed along the outer periphery of the upper surface to allow the seal ring 63 to fit in. The bottom surface of the piston 64 is provided with a recessed mounting portion 64b to which a slide bearing 65 is attached.

[0040] In this embodiment, the slide bearing 65 is attached to the mounting portion 64b, but a bearing holder may be installed on the mounting portion 64b and the slide bearing 65 may be attached via the bearing holder. Also, the mounting portion 64b may not be provided on the bottom surface of the piston 64, and the slide bearing 65 may be directly adhesively fixed to the bottom surface of the piston 64. Furthermore, the shim 62 may be omitted.

[0041] The slide bearing 65 is a self-lubricating plate made of PTFE with a low friction coefficient and a circular shape in plan view. The bottom surface 65a of the slide bearing 65 serves as the upper shoe sliding surface 10a that slides against the lower shoe sliding surface 20a, which is the surface of the slide plate 22 of the expandable lower shoe 20.

[0042] 3 to 5, the expandable lower shoe 20 comprises a main body 21 disposed on the central side in a plan view, and an expansion section 31 disposed outside the main body 21 in a plan view, i.e., along the main body 21. The main body 21 comprises a main body side sole plate 22 fixed to the upper surface 300a of the lower structure 300, and a main body side slide plate 23 attached to the upper surface of the main body side sole plate 22.

[0043] As shown in FIGS. 3 to 5, the upper surface of the main body side slide plate 23 is formed with a smooth main body side lower shoe sliding surface 23a that slides on the above-mentioned upper shoe sliding surface 10a. The main body side lower shoe sliding surface 23a is formed larger than the upper shoe sliding surface 10a, and the above-mentioned upper shoe 10 is initially positioned such that the upper shoe sliding surface 10a is at the center position in a plan view of the main body side lower shoe sliding surface 23a of the main body side slide plate 23, as shown by the virtual line in Figure 4.

[0044] 4 and 5, the main body side sole plate 22 is formed in a square shape in a plan view, while the main body side slide plate 23 is formed in an octagonal shape in a plan view that is slightly smaller than the main body side sole plate 22. Specifically, the main body side slide plate 23 is formed in a square shape in plan view with the same size as the main body side sole plate 22, with four corners chamfered at an angle. In other words, the main body side slide plate 23, which is octagonal in plan view, is formed in a square shape in plan view with chamfered portions 24 formed at the four corners.

[0045] The extension section 31 includes an extension-side sole plate 32 disposed outside the main body-side sole plate 22 in a plan view, and an extension-side slide plate 33 mounted on the extension-side sole plate 32. A smooth extension-side lower shoe sliding surface 33a that slides on the upper shoe sliding surface 10a of the upper shoe 10 is formed on the upper surface of the extension-side slide plate 33. The extension-side lower shoe sliding surface 33a and the main body-side lower shoe sliding surface 23a form the lower shoe sliding surface 20a.

[0046] Four expansion-side sole plates 32 are provided on the outer side of the main body-side sole plate 22 in a plan view, dividing the plate into four equal parts in the circumferential direction, and as shown in Fig. 3, are arranged in the shape of a square frame in a plan view so as to surround the main body-side sole plate 22 from the outer side in a plan view. The number of expansion-side sole plates 32 is not limited to four, and any number other than four may be provided.

[0047] The four expansion side sole plates 32 are arranged outside the main body side sole plate 22 in a planar view, corresponding to the four corners of the main body side sole plate 22, which is square in planar view, and are all formed in an L-shape in a planar view so as to circumscribe the corresponding corners, and are formed to be the same size as each other.

[0048] As a result, as shown in Fig. 3, the four expansion-side sole plates 32 are arranged with almost no gaps between their upper surfaces in the circumferential direction, and also with almost no gaps between their upper surfaces relative to the main body-side sole plate 22. Here, as shown in Figs. 6(a), 7(a)(b), and 8(a)(b), the boundaries between adjacent ones of the four expansion-side sole plates 32 and the main body-side sole plate 22 are defined as sole boundaries 25.

[0049] Four expansion-side slide plates 33 are provided on the outer side of the main body-side slide plate 23 in a plan view, dividing the circumferential area into four equal parts, and are arranged in a frame shape as a whole so as to surround the outer side of the main body-side slide plate 23 in a plan view. The number of expansion-side slide plates 33 is not limited to four, and any number other than four may be provided.

[0050] The four expansion side slide plates 33 are arranged on the outside of the main body side slide plate 23 in a planar view, corresponding to the four chamfered portions 24 on the main body side slide plate 23, which is square in planar view, and are attached one by one to the upper surfaces of each of the four expansion side sole plates 32, and are formed to be of the same shape and size as each other.

[0051] The positions of the boundaries 41 between adjacent ones of the four expansion-side slide plates 33 in the circumferential direction coincide with the positions of the sole boundaries 25 in a plan view. Furthermore, the positions of the boundaries 42 between each of the four expansion-side slide plates 33 and the main body-side slide plate 23 also coincide with the positions of the sole boundaries 25 in a plan view, except for the portions corresponding to the chamfered portions 24.

[0052] In other words, in the area corresponding to the chamfered portion 24 in the circumferential direction of the main body side slide plate 23, the position of the boundary portion 42 with the expansion side slide plate 33 does not coincide with the position of the sole boundary portion 25 in a plan view.

[0053] Specifically, as shown in Figures 5 and 6(a), the portion of the main body side slide plate 23 corresponding to the chamfered portion 24 in the circumferential direction is formed so that the boundary portion 42 with the expansion side slide plate 33 is retracted radially inward from the sole boundary portion 25.

[0054] As a result, as shown in Figures 4 and 5, at the portion corresponding to the chamfered portion 24 in the circumferential direction of the main body side slide plate 23, an expansion side end region 26 having a triangular shape in a plan view is formed, surrounded by the boundary portion 42 between the main body side slide plate 23 and the expansion side slide plate 33 and the sole boundary portion 25.

[0055] On the other hand, as shown in Figures 3 and 4, the expansion side slide plate 33 is integrally formed with an expansion side slide plate main body portion 38 which has the same planar shape as the L-shaped planar shape of the expansion side sole plate 32, and a protrusion portion 39 which protrudes radially inward at a portion corresponding to the inner corner portion of the expansion side slide plate main body portion 38.

[0056] The protrusion 39 is formed in a triangular shape in plan view corresponding to the expanded side end region 26 which is triangular in plan view, and the end 42a on the boundary 42 side with the main body side slide plate 23 in plan view, i.e., the inner edge, protrudes beyond the sole boundary 25 to the side of the main body side slide plate 23.

[0057] As described above, the four main body side slide plates 23 and the extension side slide plates 33 are arranged side by side with almost no gaps at the boundaries 41, 42 between adjacent ones.

[0058] That is, in the expandable lower shoe 20 of this embodiment, the lower shoe sliding surface 20a is extended outward in a planar view from the main body side lower shoe sliding surface 23a of the main body side slide plate 23, which corresponds to the slide plate of a standard size lower shoe, to the expanded side lower shoe sliding surface 33a of the expanded side slide plate 33.

[0059] The four main body side slide plates 23 and the extension side slide plate 33 described above each have a lower shoe sliding surface 20a formed as a horizontal smooth surface, but the extension side lower shoe sliding surface 33a of each of the four extension side slide plates 33 is installed so that its height is slightly higher than the height of the main body side lower shoe sliding surface 23a of the main body side slide plate 23.

[0060] As shown in FIG. 3, the four expansion-side slide plates 33 include two high-expansion-side slide plates 331 and two low-expansion-side slide plates 332 . The extension-side lower shoe sliding surface 33a of the high-expansion-side slide plate 331 is installed so as to be at a height equal to or higher than the extension-side lower shoe sliding surface 33a of the low-expansion-side slide plate 332. Specifically, the main body-side slide plate 23, the low-expansion-side slide plate 332, and the high-expansion-side slide plate 331 are set to three height levels so that the heights of their respective extension-side lower shoe sliding surfaces 33a increase in this order. Furthermore, these multiple lower shoe sliding surfaces 20a are set at height levels that are not affected by the height clearance that occurs when the four main body side slide plates 23 and the extension side slide plate 33 are arranged side by side, and that minimize differences between them.

[0061] The high-expansion side slide plates 331 and the low-expansion side slide plates 332 are alternately arranged in the circumferential direction on the outer side of the main body side slide plate 23 in a plan view. In this embodiment, in Figure 3, the high-expansion side slide plate 331 is arranged on each of the left and right sides of the main body side slide plate 23, and the low-expansion side slide plate 332 is arranged on each of the top and bottom sides, but this is not limited to this and the reverse combination is also possible.

[0062] As shown in Figure 6(a), due to the above-mentioned height setting of each lower shoe sliding surface 20a of the main body side slide plate 23 and the expansion side slide plate 33, at the boundary 42 between them, the end 42a on the expansion side slide plate 33 side is set higher than the end 42b on the main body side slide plate 23 side, and a step is created by the end 42a.

[0063] As shown in Fig. 6(b), at the boundary portion 42, the end portion 42a forming a step is chamfered into a gentler curve than the angle formed by the end face of the expansion-side slide plate 33 on the boundary portion 42 side and the expansion-side lower shoe sliding surface 33a, which is chamfered into an inclined surface. Note that, for convenience, the shape of the end portion 42a chamfered into a curved surface is shown only in Fig. 6(b).

[0064] This reduces the local load that is applied when the upper shoe sliding surface 10a passes through the boundary 42 between the lower shoe sliding surfaces 20a of the expandable lower shoe 20 and comes into contact with the end 42a, which forms a step.

[0065] 6(a), an end 42a of the expansion-side slide plate 33 on the side of the boundary 42 with the main body-side slide plate 23, i.e., a region R33 within a predetermined range from the inner edge, is defined as an inner end region 35a. The inner end region 35a includes the end 42a that forms a step. The upper surfaces of the inner end region 35a and the other region 37a of the expansion-side slide plate 33 are flush with each other, forming a continuous expansion-side lower shoe sliding surface 33a.

[0066] As shown in Figures 3, 4 and 6(a), the inner end region 35a is set over the entire inner edge of the expansion side slide plate 33, but also includes the entire protrusion portion 39 in the area corresponding to the chamfered portion 24 of the expansion side slide plate 33.

[0067] As a result, as shown in Figure 6(a), the inner end region 35a has an end 43a opposite to the end 42a on the boundary 42 side, which is located beyond the sole boundary 25 in a planar view and opposite the end 41a on the boundary 42 side.

[0068] As shown in Figure 6(a), the expandable lower shoe 20 is formed of a resin that is more deformable than the constituent material of the area 37a other than the inner end area 35a, as a high deformation means that the inner end area 35a of the expansion side slide plate 33 can be deformed more than the area 37a other than the inner end area 35a.

[0069] In this embodiment, the base material of the region 37a other than the inner end region 35a of the expansion side slide plate 33 is made of austenitic stainless steel (SUS304), while the inner end region 35a is made of a resin that can plastically deform so as to be compressed by a load from above.

[0070] More specifically, the inner end region 35a is formed so that its upper surface can be compressed and deformed by a load from above until it becomes flush with the upper surface of the adjacent main body side slide plate 23.

[0071] 7(a)(b) and 8(a)(b), at the boundary 41 between the high-expansion-side slide plate 331 and the low-expansion-side slide plate 332, the end 41a on the high-expansion-side slide plate 331 side is set higher than the end 41b on the low-expansion-side slide plate 332 side. Therefore, a step is created at the boundary 41 by the end 41a on the high-expansion-side slide plate 331 side.

[0072] 7(b) and 8(b), the edge 41a, which forms a step at the boundary 41, is chamfered into a gentler curve than the angle formed by the end face of the high-expansion-side slide plate 331 on the boundary 41 side and the expansion-side lower shoe sliding surface 33a, which is chamfered into an inclined surface. Note that, for convenience, the curved chamfered shape of the edge 41a is shown only in FIGS. 7(b) and 8(b). This reduces the local load that is applied when the upper shoe sliding surface 10a passes through the boundary 41 between the expansion side lower shoe sliding surfaces 33a of the expandable lower shoe 20 and comes into contact with the end 41a, which forms a step.

[0073] 7(a), a region R33 of the high-expansion-side slide plate 331 within a predetermined range from the end 41a on the side of the boundary 41 adjacent to the low-expansion-side slide plate 332 on one side in the circumferential direction is defined as the one-side end region 35b. The one-side end region 35b includes the one-side end 41a that forms a step. The top surfaces of the one-side end region 35b and the other region 37b of the expansion-side slide plate 33 are flush with each other, forming a continuous expansion-side lower shoe sliding surface 33a.

[0074] As shown in Figure 7(a), the expandable lower shoe 20 is formed of a material that is more deformable than the constituent material of the area 37b other than the one-side end area 35b, as a high deformation means that the one-side end area 35b of the expansion side slide plate 33 can be deformed more than the area 37b other than the one-side end area 35b.

[0075] In this embodiment, similar to the case of the inner end region 35a and the other region 37a of the expansion side slide plate 33 described above, the region 37b other than the one side end region 35b of the expansion side slide plate 33 is made of austenitic stainless steel (SUS304), whereas the one side end region 35b is made of a resin that can plastically deform so as to be compressed by a load from above.

[0076] Specifically, the one-side end region 35b is formed so that its upper surface can be compressed and deformed by a load from above until it becomes flush with the upper surface of the adjacent low-expansion side slide plate 332.

[0077] 8(a), a region R33 of the high-expansion-side slide plate 331 within a predetermined range from the end 41a on the side of the boundary 41 adjacent to the low-expansion-side slide plate 332 on the other side in the circumferential direction is defined as the other-side end region 35c. The other-side end region 35c includes the other-side end 41a, which forms a step. The upper surfaces of the other-side end region 35c and the other region 37c of the expansion-side slide plate 33 are flush with each other, forming a continuous expansion-side lower shoe sliding surface 33a.

[0078] As shown in Figures 8(a) and (b), the expandable lower shoe 20 has a gap 36 between the other end region 35c and the expansion side sole plate 32, which serves as a high deformation means that allows the other end region 35c of the expansion side slide plate 33 to deform more than the region 37c other than the other end region 35c, allowing bending deformation toward the expansion side sole plate 32.

[0079] The gap 36 serving as the high deformation means is formed as a groove by recessing downward the surface of the expansion-side sole plate 32 facing the other-side end region 35c, and is formed with a depth corresponding to the difference in height between the upper surfaces of both end portions 41a, 41b of the boundary portion 41, i.e., the step portion. The gap 36 is formed in the expansion-side slide plate 33 in a region R33 within a predetermined range from the sole boundary portion 25.

[0080] As shown in Figure 8(a), the other end region 35c of the high-expansion side slide plate 331 protrudes cantilever-like toward the boundary 41 with the low-expansion side slide plate 332 relative to the region 37c other than the other end region 35c, and is formed so as to be able to flex downward in response to a load from above.

[0081] The bearing device 1 of the present embodiment described above can achieve the following effects. As shown in Figures 1 and 3, the portion of the expandable lower shoe 20 facing the upper shoe 10 has the main body side slide plate 23 and multiple expansion side slide plates 33 arranged in parallel to expand the lower shoe sliding surface 20a of the expandable lower shoe 20.Therefore, even when the upper shoe 10 slides with a very large amplitude against the expandable lower shoe 20, such as during a major earthquake, the expandable lower shoe 20 can support the upper shoe 10 in response to such amplitude.

[0082] 6(a), the expandable lower shoe 20 has an inner end region 35a of the expansion-side slide plate 33 formed of a resin with higher deformability than the constituent material of the region 37a other than the inner end region 35a, as a high deformation means that the inner end region 35a can be deformed more than the region 37a other than the inner end region 35a. This allows the inner end region 35a to be compressively deformed toward the expansion-side sole plate 32 in response to the load from the upper shoe 10 when the upper shoe sliding surface 10a slides on the lower shoe sliding surface 20a of the expandable lower shoe 20 and passes through the boundary 42 between the two. This allows the upper shoe sliding surface 10a to come into surface contact with the inner end region 35a, which can alleviate the concentration of a local load on the upper shoe sliding surface 10a, as occurs when the upper shoe sliding surface 10a comes into line contact along a step, for example.

[0083] Therefore, when the upper shoe 10 passes through the boundary 42 between the lower shoe sliding surfaces 20a of the adjacent main body side slide plate 23 and extension side slide plate 33, damage to the upper shoe 10 due to the step at the boundary 42 is suppressed, and the desired sliding performance can be ensured.

[0084] Furthermore, as shown in Figure 7(a), the expandable lower shoe 20 is formed of a resin that is more deformable than the constituent material of the area 37b other than the one-side end area 35b, as a high deformation means that allows the one-side end area 35b of the expansion side slide plate 33 to be deformed more than the area 37b other than the one-side end area 35b.Therefore, when the upper shoe 10 slides on the expansion side lower shoe sliding surface 33a and passes through the boundary 42 between them, the one-side end area 35b can be compressed and deformed toward the expansion side sole plate 32 in response to the load from the upper shoe 10.

[0085] Similarly, for example, as shown in Figure 8(a), the expandable lower shoe 20 has a gap 36 between the other end region 35c and the expansion side sole plate 32, which serves as a high deformation means that allows the other end region 35c of the expansion side slide plate 33 to deform more than the region 37c other than the other end region 35c. This allows the other end region 35c to flex and deform toward the expansion side sole plate 32, so that the other end region 35c can reliably flex and deform in the gap 36 in response to the load from the upper shoe 10.

[0086] This eliminates the step formed by the end 41a of the one-side end region 35b on the boundary 41 side and the step formed by the end 41a of the other-side end region 35c on the boundary 41 side at the boundary 41. This allows the upper shoe sliding surface 10a to come into surface contact with each of the one-side end region 35b and the other-side end region 35c when the upper shoe sliding surface 10a passes through the boundary 42 between the lower shoe sliding surfaces 20a of the expandable lower shoe 20, thereby mitigating the concentration of a local load on the upper shoe sliding surface 10a, which occurs when the upper shoe sliding surface comes into line contact along a step, for example. Therefore, when the upper shoe 10 passes through the boundary 41 between the respective expansion side lower shoe sliding surfaces 33a of adjacent expansion side slide plates 33, damage to the upper shoe 10 due to the step at the boundary 41 is suppressed, and the desired sliding performance can be ensured.

[0087] Furthermore, in the sliding direction, the end 42b on the side of the boundary 42 with the expansion-side slide plate 33 at the portion corresponding to the chamfered portion 24 of the main body side slide plate 23 is formed to be retracted to the side opposite the expansion-side sole plate 32 side with respect to the sole boundary 25, and a protruding portion 39 is formed in the expansion-side end region 26, which protrudes beyond the sole boundary 25 to the side of the end 42b of the main body side slide plate 23, and the inner end region 35a as a high deformation means is also provided in the protruding portion 39, so that even when the expandable lower shoe 20 is constructed by arranging the expansion-side slide plate 33 next to the existing main body side slide plate 23 and expanding the lower shoe sliding surface 20a, the step between the juxtaposed lower shoe sliding surfaces 20a can be eliminated.

[0088] More specifically, in the case of the lower shoe of an existing bearing device, similar to the expandable lower shoe 20 of this embodiment, the four corners of the main body side slide plate 23 are generally arranged on the inside in plan view relative to the main body side sole plate 22 which is square in plan view, as shown in Figures 3 and 4, and at these four corners, the end 42b of the boundary 42 between the main body side slide plate 23 and the expansion side slide plate 33 is sometimes set back more inward than the sole boundary 25. For this reason, the four corners of the main body side slide plate 23 form expansion side end regions 26.

[0089] In other words, when constructing an expandable lower shoe 20 by providing an extension section 31 for a main body section 21 that corresponds to the size of an existing lower shoe, when fixing the extension side slide plate 33 to the extension side sole plate 32, by arranging a protrusion section 39 in the extension side end region 26, the gap between the main body side slide plate 23 and the extension side slide plate 33 at the boundary section 42 can be made as small as possible.

[0090] Furthermore, by providing the inner end region 35a as a high deformation means on the protrusion portion 39 of the expansion side slide plate 33, even if a step occurs between the respective lower shoe sliding surfaces 20a at the boundary portion 42 between the main body side slide plate 23 and the expansion side slide plate 33, the adverse effects caused by the step can be eliminated.

[0091] As described above, in the configuration of the present invention and the correspondence with the above-mentioned embodiment, the fixing member of the present invention corresponds to the main body side sole plate 22 and the expansion side sole plate 32, Similarly, The main body side fixing member corresponds to the main body side sole plate 22, The main body side slide plate corresponds to the main body side slide plate 23, The expansion side fixing member corresponds to the expansion side sole plate 32, The extension side slide plate corresponds to the extension side slide plate 33, The slide plate corresponds to the main body side slide plate 23 and the extension side slide plate 33, The first shoe corresponds to the upper shoe 10, The second shoe corresponds to the extended lower shoe 20, The second sliding surface corresponds to the lower shoe sliding surface 20a, In the relationship between the adjacent main body side slide plate 23 and the extension side slide plate 33, one side slide plate corresponds to the extension side slide plate 33, and the other side slide plate corresponds to the main body side slide plate 23, In the relationship between the adjacent high-expansion side slide plate 331 and low-expansion side slide plate 332, one slide plate corresponds to the high-expansion side slide plate 331, and the other slide plate corresponds to the low-expansion side slide plate 332. The end regions correspond to an inner end region 35a, a one-side end region 35b, and an other-side end region 35c. The boundary between the main body side fixing member and the expansion side fixing member corresponds to the sole boundary portion 25, The first structure corresponds to the superstructure 200; The second structure corresponds to the lower structure 300, In the sliding direction, the edge of the main body side slider on the side of the boundary with the extension side slider corresponds to the end 42b; The high deformation means corresponds to the inner end region 35a, the one side end region 35b or the gap 36, but the present invention is not limited to the configuration of the above-mentioned embodiment, and many other embodiments can be obtained.

[0092] For example, as shown in Figure 8(a), a gap 36 is provided between the other-side end region 35c and the expansion-side sole plate 32 as high deformation means, but this gap 36 may be provided with rubber (not shown) that is elastically deformable downward in response to the load from the upper shoe 10. By providing rubber as high deformation means in the gap 36, dust and the like cannot enter the gap 36, and the adverse effects of a step occurring at the boundary 41 can be eliminated.

[0093] Here, it is preferable that the high deformation means of the present invention be provided on the side of the sliding plate with the higher sliding surface of the adjacent sliding plates, since this can eliminate the step at the boundary when passing through the boundary between them. For this reason, as described above, the expandable lower shoe 20 of this embodiment is configured so that the height relationship between the adjacent sliding surfaces is intentionally set and the high deformation means is reliably provided on the side of the sliding plate with the higher sliding surface of the adjacent sliding plates.

[0094] However, the high deformation means is not limited to being provided in the region R33 within a predetermined range from the end side that is intentionally set higher, at the boundary 42 between adjacent main body side slide plates 23 and expansion side slide plates 33, or at both ends that form the boundary 41 between adjacent expansion side slide plates 33, as in the above-mentioned embodiment, but may also be provided on both sides.

[0095] For example, Fig. 9 is a plan view of the expandable lower shoe 20 equipped with high deformation means on both end sides of the boundary 41 between adjacent expansion-side slide plates 33. Of the four boundary parts 41 located on the outer side of the main body-side slide plate 23 in a plan view, the boundary part 41 above the main body-side slide plate 23 in Fig. 9 is equipped with high deformation means in an embodiment in which a region R33 within a predetermined range from the ends 41a, 41b on both sides of the boundary part 41 is made of resin and is an end part region 354b.

[0096] Similarly, an embodiment is shown in which a gap 36 is provided in a region R33 within a predetermined range from the ends 41a and 41b on both sides of the lower boundary 41, and an embodiment is shown in which a region R33 within a predetermined range from the end 41a on one side of the boundary 41 is made into a one-side end region 35b made of resin on one side of the boundary 41 and a gap 36 is provided in a region R33 within a predetermined range from the end 41b on the other side of the boundary 41.

[0097] In this way, the high deformation means may be provided in various combinations on both sides of the boundary portion 41, and by providing them on both sides of the boundary portion 41, even if a step occurs at the end on either side of the boundary portion 41 due to the clearance when arranging the four expansion side slide plates 33 side by side, the adverse effects of the step can be eliminated, and there is no need to manage the height relationship between adjacent lower shoe sliding surfaces 20a so that the end is intentionally higher on one side of the boundary portion 41.

[0098] In addition, in the above-described embodiment, the inner end region 35a or one side end region 35b, which serves as a high deformation means, is compressed and deformed toward the extended side sole plate 32 in response to the load from the upper shoe 10, but the compressive deformation may be either elastic deformation or plastic deformation. [Explanation of symbols]

[0099] 1...Support device 10...Upper foot 10a...Upper shoe sliding surface 20...Extendable lower shoe 22...Main body sole plate 23...Main body slide plate 20a…Lower shoe sliding surface 25...Sole boundary 26...Extended side end region 32…Extended side sole plate 33...Extension side slide plate 35a...Inner end area 35b...One side end area 35c...Other side end area 36...Gap 39...Protruding part 41...Boundary between adjacent extension side slide plates 41a...End portion of the highly expandable slide plate at the boundary between adjacent expandable slide plates 42...Boundary between the extension side slide plate and the main body side slide plate 42a...extension-side slide plate side end at the boundary between the extension-side slide plate and the main body-side slide plate 200...superstructure 300...Substructure

Claims

1. A bearing device comprising a first shoe and a second shoe disposed at opposing portions of a first structure and a second structure, wherein sliding surfaces at opposing portions of the first shoe and the second shoe slide against each other, a plurality of sliding plates that constitute a second sliding surface, which is a sliding surface of the second shoe, are arranged in a row at a portion of the second shoe that faces the first shoe; In the sliding plate, a region within a predetermined range from the edge on the side of the boundary with the adjacent other sliding plate is defined as an end region, One of the adjacent slide plates is designated as a one-side slide plate, and the other of the adjacent slide plates is designated as an other-side slide plate, The one-side sliding plate is installed so that the second sliding surface is at the same height or higher than the second sliding surface of the other-side sliding plate, The second shoe is provided with a high deformation means that allows at least the end region of the one side sliding plate to be deformed more than other regions. Bearing device.

2. a fixing member for fixing the sliding plate is provided on the second shoe on a side opposite to the second sliding surface in an axial compression direction by the first shoe; The high deformation means is provided between at least the end region of the sliding plate and the fixed member facing the end region, and is a gap that allows the end region to bend toward the fixed member. The bearing device of claim 1 .

3. The high deformation means is formed of a resin having a higher deformability than the constituent material of the other region of the one-side sliding plate. The bearing device of claim 1 .

4. The high deformation means is formed of rubber that is elastically deformable toward the fixing member that fixes the sliding plate in response to the load from the first shoe. The bearing device of claim 1 .

5. The edge of the one-side sliding plate located at the boundary of the edge region is chamfered into a curved surface that is gentler than an inclined surface chamfer, at a corner formed by the edge face on the boundary side and the second sliding surface. A bearing device according to any one of claims 1 to 4.

6. The sliding plate includes a main body side sliding plate that is in contact with a first sliding surface, which is the sliding surface of the first shoe, under normal conditions, and an extension side sliding plate that extends outward relative to the main body side sliding plate in the sliding direction of the first shoe, The one-side sliding plate is the extension-side sliding plate, and the other-side sliding plate is the main body-side sliding plate, The fixing member for fixing the sliding plate includes a main body side fixing member for fixing the main body side sliding plate and an extension side fixing member for fixing the extension side sliding plate, and in the sliding direction, the boundary between the main body side fixing member and the extension side fixing member is defined as a fixed side boundary, In the extension side sliding plate, a region of a predetermined range from the edge on the side of the boundary portion with the adjacent main body side sliding plate is defined as an extension side end region, In the sliding direction, the edge of the main body side sliding plate on the side of the boundary with the extension side sliding plate is formed to retreat to the side opposite the extension side fixed member side with respect to the fixed side boundary, and a protruding portion is formed in the extension side end region, which protrudes beyond the fixed side boundary to the end side of the main body side sliding plate, The high deformation means is provided on the protruding portion. The bearing device of claim 1 .

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