Slide bearing, slide bearing construction structure, and base-isolated structure

Abstract

To provide a slide bearing, a slide bearing construction structure, and a base-isolated structure capable of suppressing an occupying area in a plane view.SOLUTION: A slide bearing 1 is equipped with an upper shoe 10 fixed on an upper structure by a fastening member, and a lower shoe 20 fixed on a lower structure by the fastening member. The upper shoe 10 and the lower shoe 20 have protruded parts 14 and 24 that are not overlapped with each other in a plane view. The protruded parts 14 and 24 are formed with mounting holes 14a and 24a for mounting the fastening member. As the protruded parts 14 and 24, flat protruded parts 15 and 25 that have trapezoidal shape in a plane view are provided.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a sliding bearing, a sliding bearing construction structure, and a seismic isolation structure. [Background technology]

[0002] A sliding bearing is known as a seismic isolation device installed in buildings and the like. The sliding bearing has an upper shoe and a lower shoe that face each other in the vertical direction. The upper shoe is fixed to the upper structure by a fastening member such as a bolt, and the lower shoe is fixed to the lower structure by a fastening member such as a bolt. The distance between the outer periphery on the lower surface of the upper shoe and the outer periphery on the upper surface of the lower shoe is small. Therefore, if the upper shoe and the lower shoe, which are rectangular in plan view, are arranged with the same plan view orientation of the upper shoe and the lower shoe, a vertical space corresponding to the length of the fastening member cannot be secured, and installation work cannot be performed. Therefore, in the past, the plan view orientation of the upper shoe and the lower shoe have been made different to secure a work space for attaching a fastening member to the fixing part of the upper shoe or the lower shoe (for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-33716 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the upper shoe and the lower shoe are arranged with different orientations in a plan view, the sliding bearing has a protruding portion that does not overlap the upper shoe and the lower shoe in a plan view. If the upper shoe and the lower shoe are rectangular in a plan view, the protruding portion becomes triangular, and the area occupied by the sliding bearing in a plan view increases by the amount that the protruding portion protrudes outward, which is disadvantageous in terms of designing the structure. There is a demand for a sliding bearing that can reduce the area occupied in a plan view.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a sliding bearing, a sliding bearing construction structure, and a seismic isolation structure that can reduce the area occupied in a plan view. [Means for solving the problem]

[0006] A sliding bearing according to one embodiment of the present invention is a sliding bearing arranged between an upper structure and a lower structure opposite the upper structure, and comprises an upper shoe fixed to the upper structure with a fastening member, and a lower shoe fixed to the lower structure with a fastening member, the upper shoe and the lower shoe having protruding portions that do not overlap with each other in a planar view, and mounting holes for attaching the fastening members are formed in the protruding portions, and the protruding portions have flat protruding portions that are trapezoidal in a planar view.

[0007] A sliding bearing construction structure according to one aspect of the present invention comprises the sliding bearing and a fixing member that connects the side surfaces of the upper shoe and the lower shoe that intersect with each other in a plan view.

[0008] A seismic isolation structure according to one embodiment of the present invention comprises the sliding bearing, the upper structure, and the lower structure, and the sliding bearing is a base isolation structure fixed to the lower structure as a foundation structure. Effect of the Invention

[0009] According to the present invention, it is possible to provide a sliding bearing, a sliding bearing construction structure, and a seismic isolation structure that can reduce the area occupied in a plan view. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a front cross-sectional view of the sliding bearing and seismic isolation structure according to the first embodiment. [Diagram 2] FIG. 2 is a perspective view of the sliding bearing according to the first embodiment. [Diagram 3] FIG. 2 is a plan view of the sliding bearing according to the first embodiment. [Figure 4] 4 is a half-sectional view of the sliding bearing according to the first embodiment taken along the line AA in FIG. 3. [Diagram 5] FIG. 1 is a perspective view of a sliding bearing construction structure according to a first embodiment. [Figure 6] FIG. 11 is a perspective view of a sliding bearing according to a modified example of the first embodiment. [Figure 7] FIG. 11 is a perspective view of a sliding bearing according to a second embodiment. [Figure 8] FIG. 11 is a plan view of a sliding bearing according to a second embodiment. [Figure 9] 9 is a half-sectional view of the sliding bearing according to the second embodiment taken along the line BB in FIG. 8. [Figure 10] FIG. 11 is a perspective view of a sliding bearing according to a third embodiment. [Figure 11] A front cross-sectional view of a second sliding bearing according to a fourth embodiment. [Figure 12] FIG. 11 is a perspective view of a second sliding bearing according to a fourth embodiment. [Figure 13] FIG. 13 is a diagram showing a seismic isolation structure according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (First embodiment) Hereinafter, a sliding bearing 1 and a seismic isolation structure 100 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 5. As shown in Fig. 1, the seismic isolation structure 100 has an upper structure U, a lower structure L, and a sliding bearing 1. The upper structure U and the lower structure L face each other in the vertical direction. The sliding bearing 1 is disposed between the upper structure U and the lower structure L. When an earthquake motion occurs, the sliding bearing 1 causes relative displacement between the upper structure U and the lower structure L in the horizontal direction. This suppresses transmission of vibrations of the lower structure L to the upper structure U.

[0012] For example, the sliding bearing 1 is used for base isolation. In this case, for example, the upper structure U is a structure such as a building or a bridge, and the lower structure L is a foundation structure installed on the ground. The sliding bearing 1 may also be used for mid-story seismic isolation.

[0013] The sliding bearing 1 has an upper shoe 10, a lower shoe 20, and a slider 30 that slides between the upper shoe 10 and the lower shoe 20.

[0014] The upper shoe 10 is disposed under the upper structure U. The upper shoe 10 is fixed to the upper structure U with fastening members F such as bolts so that it cannot move relative to the upper structure U. The upper shoe 10 is a plate material that is octagonal in plan view. For example, the upper shoe 10 is formed by cutting off the corners of a plate member that is rectangular in plan view. The upper shoe 10 is formed from rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C), etc.

[0015] The lower surface of the upper shoe 10 is provided with an upper sliding surface 11, which is a concave spherical surface. The upper sliding surface 11 is formed in a circular shape in a plan view. A stainless steel sliding plate (not shown) is fixed to the upper sliding surface 11. In addition, an upper stopper ring 12, which is annular in a plan view, is fixed to the outer periphery of the sliding plate to the upper sliding surface 11. In the following description, a virtual axis that passes through the center of the upper sliding surface 11 in a plan view and extends in the vertical direction is referred to as the axis of the upper shoe 10. In a plan view, the axis of the upper shoe 10 coincides with the center of gravity of the outer shape of the upper shoe 10. In addition, in a plan view, a direction that intersects with the axis of the upper shoe 10 is referred to as the radial direction, and a direction that goes around the axis of the upper shoe 10 is referred to as the circumferential direction.

[0016] The lower shoe 20 is disposed on the upper part of the lower structure L. The lower shoe 20 is fixed to the lower structure L by fastening members F such as bolts so as to be immovable relative to the lower structure L. The lower shoe 20 is a plate material having an octagonal shape in a plan view. For example, the lower shoe 20 is formed by cutting off the corners of a plate member having a rectangular shape in a plan view. The lower shoe 20 is formed from a rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C) or the like. In this embodiment, the upper shoe 10 and the lower shoe 20 have the same shape and size.

[0017] The upper surface of the lower shoe 20 is provided with a lower sliding surface 21, which is a concave spherical surface. The lower sliding surface 21 is formed in a circular shape in a plan view. A stainless steel sliding plate (not shown) is fixed to the lower sliding surface 21. In addition, a lower stopper ring 22, which is annular in a plan view, is fixed to the outer periphery of the sliding plate to the lower sliding surface 21. In the following description, a virtual axis that passes through the center of the lower sliding surface 21 in a plan view and extends in the vertical direction is referred to as the axis of the lower shoe 20. The axis of the lower shoe 20 coincides with the center of gravity of the outer shape of the lower shoe 20 in a plan view.

[0018] The slider 30 is disposed between the upper shoe 10 and the lower shoe 20. The slider 30 has a substantially cylindrical shape. The slider 30 has an upper sliding surface 31 and a lower sliding surface 32, which are convex spherical surfaces. The slider 30 is formed from rolled steel material for welding steel material (SM490A, B, C, or SN490B, C, or S45C), stainless steel material (SUS304, SUS316), or the like. The slider 30 has a surface pressure of 60 N / mm 2 It has a load-bearing strength of about (60 MPa).

[0019] The upper sliding surface 31 is in slidable contact with the upper sliding surface 11, and the lower sliding surface 32 is in slidable contact with the lower sliding surface 21. In order to facilitate sliding of the slider 30 against the upper shoe 10 and the lower shoe 20, for example, a friction material is provided on the upper sliding surface 31 and the lower sliding surface 32. The friction material is, for example, a friction material made of at least PTFE. The friction material is formed of a double weave. The double weave is formed of PTFE fiber (polytetrafluoroethylene) and a fiber (high strength fiber) having a higher tensile strength than the PTFE fiber. Here, examples of the "fiber having a higher tensile strength than the PTFE fiber" include polyamides such as nylon 6·6, nylon 6, and nylon 4·6, polyesters such as polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, and fibers such as para-aramid. In addition, examples of "fibers having a higher tensile strength than PTFE fibers" include fibers such as meta-aramid, polyethylene, polypropylene, glass, carbon, polyphenylene sulfide (PPS), LCP, polyimide, and PEEK. Furthermore, examples of "fibers having a higher tensile strength than PTFE fibers" include heat-sealed fibers, cotton, wool, and other fibers. Among these, PPS fibers, which have excellent chemical resistance and hydrolysis resistance and extremely high tensile strength, are preferable. In addition, the friction material made of at least PTFE may be a fabric containing PTFE fibers other than a double woven fabric, or may be a friction material made of only PTFE, a friction material made of a composite material of PTFE and other resins, or a friction material having a laminated structure of a friction material made of PTFE and a friction material made of other resins.

[0020] The slider 30 slides between the upper shoe 10 and the lower shoe 20, allowing the upper shoe 10 and the lower shoe 20 to move relative to each other in the horizontal direction. As a result, when vibration of the lower structure L due to earthquake motion is transmitted to the lower shoe 20, the lower shoe 20 moves relative to the upper shoe 10. This movement prevents the vibration of the lower structure L due to earthquake motion from being transmitted to the upper structure U via the upper shoe 10.

[0021] Next, the relative positioning of the upper shoe 10 and the lower shoe 20 will be explained. As mentioned above, when earthquake motion occurs, the upper shoe 10 and the lower shoe 20 move relative to each other in the horizontal direction. In the following explanation, unless otherwise specified, the relative positioning of the upper shoe 10 and the lower shoe 20 in the initial state, in which the upper shoe 10 and the lower shoe 20 do not move relative to each other in the horizontal direction, will be explained. The relative positioning of the upper shoe 10 and the lower shoe 20 in the initial state is the relative positioning of the upper shoe 10 and the lower shoe 20 when the sliding bearing 1 is constructed.

[0022] In an initial state, the upper shoe 10 and the lower shoe 20 are arranged so that the axis of the upper shoe 10 and the axis of the lower shoe 20 coincide with each other. The upper shoe 10 and the lower shoe 20 are arranged so that the postures of the upper shoe 10 and the lower shoe 20 are different from each other in a plan view. That is, the upper shoe 10 and the lower shoe 20 are arranged so that the corners of the upper shoe 10 and the corners of the lower shoe 20 are shifted from each other in a plan view. In other words, the upper shoe 10 and the lower shoe 20 are arranged so that the sides of the upper shoe 10 and the sides of the lower shoe 20 intersect with each other in a plan view. As a result, the upper shoe 10 and the lower shoe 20 have areas that do not overlap with each other in a plan view.

[0023] The upper shoe 10 has an upper protruding portion 14 (protruding portion) that does not overlap with the lower shoe 20 in a plan view. In this embodiment, the upper shoe 10 has four upper protruding portions 14 of the same shape and size. The upper protruding portions 14 are provided with upper mounting holes 14a (mounting holes) for mounting fastening members F. The upper mounting holes 14a penetrate the upper shoe 10 in the plate thickness direction of the upper shoe 10. The upper protruding portions 14 are upper fastening portions that are fixed to the upper structure U by fastening members F.

[0024] The upper protruding portion 14 has an upper flat protruding portion 15 (flat protruding portion) that is trapezoidal in plan view. In this embodiment, all of the four upper protruding portions 14 are upper flat protruding portions 15.

[0025] In a plan view, the upper flat protruding portion 15 has first to fourth sides 15a to 15d. The first side 15a is the upper base of the trapezoidal upper flat protruding portion 15, the second side 15b is the lower base, and the third side 15c and the fourth side 15d are a pair of legs. The first side 15a, the third side 15c, and the fourth side 15d are formed by the sides of the upper shoe 10, and the second side 15b is formed by the side of the lower shoe 20.

[0026] The first side 15a and the second side 15b face each other. The first side 15a and the second side 15b are parallel to each other. The third side 15c and the fourth side 15d face each other. The third side 15c and the fourth side 15d are inclined so as to move away from each other from the first side 15a side toward the second side 15b side. The second side 15b is the longest side among the four sides of the upper flat protruding portion 15.

[0027] In the present invention, the upper protruding portion 14 (upper flat protruding portion 15) being "trapezoidal" in plan view also includes a case where the first side 15a, which is the upper base, and the second side 15b, which is the lower base, are not parallel. The angle between the first side 15a and the second side 15b may be in the range of 0 degrees to 30 degrees, preferably 0 degrees to 15 degrees, and more preferably 0 degrees to 5 degrees. The inclination angles of the third side 15c and the fourth side 15d with respect to the second side 15b may be the same or different. The "trapezoidal shape" may be any shape as long as the first side 15a, which is the upper base, is located inside the virtual vertex P, which is the intersection point of the virtual extension lines (shown by the two-dot chain line in FIG. 3) of the third side 15c and the fourth side 15d. For example, the first side 15a may be flat or may be bulging outward.

[0028] The lower shoe 20 has a lower protruding portion 24 (protruding portion) that does not overlap with the upper shoe 10 in a plan view. In this embodiment, the lower shoe 20 has four lower protruding portions 24 of the same shape and size. The lower protruding portions 24 also have the same shape and size as the upper protruding portions 14. The lower protruding portions 24 are provided with lower mounting holes 24a (mounting holes) for mounting a fastening member F. The lower mounting holes 24a penetrate the lower shoe 20 in the plate thickness direction of the lower shoe 20. The lower protruding portions 24 are lower fastening portions that are fixed to the lower structure L by the fastening members F.

[0029] The lower protruding portion 24 has a lower flat protruding portion 25 (flat protruding portion) that is trapezoidal in plan view. In this embodiment, all of the four lower protruding portions 24 are lower flat protruding portions 25.

[0030] In plan view, the lower flat protruding portion 25 has first to fourth sides 25a to 25d. The first side 25a is the upper base of the trapezoidal lower flat protruding portion 25, the second side 25b is the lower base, and the third side 25c and the fourth side 25d are a pair of legs. The first side 25a, the third side 25c, and the fourth side 25d are formed by the sides of the lower shoe 20, and the second side 25b is formed by the side of the upper shoe 10.

[0031] The first side 25a and the second side 25b face each other. The first side 25a and the second side 25b are parallel to each other. The third side 25c and the fourth side 25d face each other. The third side 25c and the fourth side 25d are inclined so as to move away from each other from the first side 25a side toward the second side 25b side. The second side 25b is the longest side among the four sides of the lower flat protruding portion 25.

[0032] In addition, in the present invention, the lower protruding portion 24 (lower flat protruding portion 25) being "trapezoidal" in plan view also includes the case where the first side 25a, which is the upper base, and the second side 25b, which is the lower base, are not parallel. The angle between the first side 25a and the second side 25b may be in the range of 0 degrees to 30 degrees, preferably 0 degrees to 15 degrees, and more preferably 0 degrees to 5 degrees. The inclination angles of the third side 25c and the fourth side 25d with respect to the second side 25b may be the same or different. In addition, the "trapezoidal shape" may be any shape as long as the first side 25a, which is the upper base, is located inside a virtual vertex, which is the intersection point of virtual extension lines of the third side 25c and the fourth side 25d. For example, the first side 25a may be flat or may be bulging outward.

[0033] 5, a sliding bearing installation structure 200 for installing the sliding bearing 1 will be described. The sliding bearing installation structure 200 includes the sliding bearing 1 and a fixing member 50 for temporarily fixing the upper shoe 10 and the lower shoe 20 of the sliding bearing 1.

[0034] The fixing member 50 connects the side surface 10a of the upper shoe 10 and the side surface 20a of the lower shoe 20 which intersect with each other in a plan view. Specifically, the fixing member 50 has a first plate portion 51 extending along the side surface 10a of the upper shoe 10 and a second plate portion 52 extending along the side surface 20a of the lower shoe 20. The first plate portion 51 is fixed to the side surface 10a of the upper shoe 10 by a bolt (not shown), and the second plate portion 52 is fixed to the side surface 20a of the lower shoe 20 by a bolt (not shown).

[0035] The fixing member 50 has a first fixing member 50A and a second fixing member 50B. The first fixing member 50A and the second fixing member 50B are provided alternately in the circumferential direction. In the first fixing member 50A, a notch is formed in the upper part of the second plate portion 52 to ensure a fixing space. In the second fixing member 50B, a hanging hole is formed in the upper part of the second plate portion 52 to hang and transport the sliding bearing 1.

[0036] When constructing the sliding bearing 1, the upper shoe 10 and the lower shoe 20 are temporarily fixed using the fixing member 50, which prevents the upper shoe 10 and the lower shoe 20 from moving relative to each other in the horizontal direction, facilitating the construction of the sliding bearing 1. After construction of the seismic isolation structure 100 is completed, the fixing member 50 is removed from the sliding bearing 1.

[0037] As described above, the sliding bearing 1 according to this embodiment comprises the upper shoe 10 fixed to the upper structural body U with a fastening member F, and the lower shoe 20 fixed to the lower structural body L with a fastening member F. The upper shoe 10 and the lower shoe 20 have protruding portions 14, 24 that do not overlap with each other in a plan view. The protruding portions 14, 24 are formed with mounting holes 14a, 24a for mounting the fastening member F. The protruding portions 14, 24 have flat protruding portions 15, 25 that are trapezoidal in a plan view.

[0038] The protruding portions 14, 24 are fixed to the upper structure U and the lower structure L with fastening members F. By having the protruding portions 14, 24 as flat protruding portions 15, 25 that are trapezoidal in a plan view, the amount of outward protrusion of the protruding portions 14, 24 can be reduced, and the area occupied by the sliding bearing 1 in a plan view can be reduced.

[0039] The upper shoe 10 and the lower shoe 20 are octagonal in plan view. The upper protruding portion 14 of the upper shoe 10 and the lower protruding portion 24 of the lower shoe 20 are all flat protruding portions 15, 25. This makes it possible to more effectively reduce the area occupied by the sliding bearing 1 in a plan view. In addition, for example, by cutting off the corners of a rectangular plate-like member, it is possible to manufacture the upper shoe 10 and the lower shoe 20 that are octagonal in plan view, which makes it easy to process during manufacturing and reduces manufacturing costs.

[0040] Further, the upper flat protruding portion 15 of the upper shoe 10 and the lower flat protruding portion 25 of the lower shoe 20 all have the same shape and size. This ensures the isotropy of the sliding bearing 1.

[0041] The sliding bearing construction structure 200 according to this embodiment comprises a sliding bearing 1 and a fixing member 50 that connects a side surface 10a of the upper shoe 10 and a side surface 20a of the lower shoe 20 that intersect with each other in a plan view. When constructing the sliding bearing 1, the upper shoe 10 and the lower shoe 20 are temporarily fixed together using the fixing member 50, thereby preventing the upper shoe 10 and the lower shoe 20 from moving relative to each other in the horizontal direction. Therefore, the sliding bearing 1 can be easily constructed.

[0042] The seismic isolation structure 100 according to this embodiment includes a sliding bearing 1, an upper structure U, and a lower structure L. The sliding bearing 1 is a base isolation structure fixed to the lower structure L as a foundation structure. Since the area occupied by the sliding bearing 1 in a plan view can be reduced, the freedom in designing the seismic isolation structure 100 is improved.

[0043] (Modification of the first embodiment) Either the upper shoe 10 or the lower shoe 20 may be rectangular in plan view. For example, as shown in Fig. 6, the upper shoe 10 may be rectangular in plan view, and the lower shoe 20 may be octagonal in plan view. In this case, the lower shoe 20 has a flat protruding portion 25 that is trapezoidal in plan view as the lower protruding portion 24. Therefore, the area occupied by the sliding bearing 1 in plan view can be reduced. Note that the lower shoe 20 may be rectangular in plan view, and the upper shoe 10 may be octagonal in plan view. In this way, when either one of the upper shoe 10 or the lower shoe 20 is rectangular in plan view, processing of that one of them can be omitted.

[0044] Second embodiment Next, a sliding bearing 2 according to a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their description will be omitted, with only the differences being described.

[0045] In this embodiment, the upper shoe 10 has a hexagonal shape in a plan view, and the lower shoe 20 has an octagonal shape in a plan view. In an initial state, the upper shoe 10 and the lower shoe 20 are arranged so that the axis of the upper shoe 10 and the axis of the lower shoe 20 coincide with each other. The upper shoe 10 and the lower shoe 20 are arranged so that they have areas that do not overlap each other in a plan view.

[0046] The upper shoe 10 has an upper protruding portion 14 that does not overlap with the lower shoe 20 in a plan view. In this embodiment, the upper shoe 10 has, as the upper protruding portion 14, an upper flat protruding portion 16 that is trapezoidal in a plan view and a triangular protruding portion 17 that is triangular in a plan view.

[0047] In a plan view, the upper flat protruding portion 16 has first to fourth sides 16a to 16d. The first side 16a is the upper base of the trapezoidal upper flat protruding portion 16, the second side 16b is the lower base, and the third side 16c and the fourth side 16d are a pair of legs. The first side 16a, the third side 16c, and the fourth side 16d are formed by the sides of the upper shoe 10, and the second side 16b is formed by the side of the lower shoe 20.

[0048] The first side 16a and the second side 16b face each other. The first side 16a and the second side 16b are parallel to each other. The third side 16c and the fourth side 16d face each other. The third side 16c and the fourth side 16d are inclined so as to move away from each other from the first side 16a side toward the second side 16b side. The second side 16b is the longest side among the four sides of the upper flat protruding portion 16.

[0049] In a plan view, triangular protruding portion 17 has first to third sides 17a to 17c. First side 17a and second side 17b are formed by sides of upper shoe 10, and third side 17c is formed by a side of lower shoe 20. Third side 17c is the longest side of the three sides of triangular protruding portion 17.

[0050] The lower shoe 20 has a lower protruding portion 24 that does not overlap with the upper shoe 10 in a plan view. In this embodiment, the lower shoe 20 has, as the lower protruding portion 24, a lower flat protruding portion 26 that is trapezoidal in a plan view.

[0051] In a plan view, the lower flat protruding portion 26 has first to fourth sides 26a to 26d. The first side 26a is the upper base of the trapezoidal lower flat protruding portion 26, the second side 26b is the lower base, and the third side 26c and the fourth side 26d are a pair of legs. The first side 26a, the third side 26c, and the fourth side 26d are formed by the sides of the lower shoe 20, and the second side 26b is formed by the side of the upper shoe 10.

[0052] The first side 26a and the second side 26b face each other. The first side 26a and the second side 26b are substantially parallel to each other. "Substantially parallel" means that the inclination angle between the first side 26a and the second side 26b is in the range of 0 degrees to 30 degrees. The third side 26c and the fourth side 26d face each other. The third side 26c and the fourth side 26d are inclined so as to move away from each other from the first side 26a side toward the second side 26b side. The second side 26b is the longest side among the four sides of the lower flat protruding portion 26.

[0053] The distance between the third side 16c and the fourth side 16d of the upper flat protruding portion 16 (i.e., the distance between both legs of the trapezoid of the upper flat protruding portion 16) is longer than the distance between the third side 26c and the fourth side 26d of the lower flat protruding portion 26 (i.e., the distance between both legs of the trapezoid of the lower flat protruding portion 26). The distance between the third side 16c and the fourth side 16d of the upper flat protruding portion 16 and the distance between the third side 26c and the fourth side 26d of the lower flat protruding portion 26 are, for example, the shortest distance between the third side 16c (26c) and the fourth side 16d (26d). The upper flat protruding portion 16 is an ultra-flat protruding portion in which the distance between both legs of the trapezoid is longer than that of the lower flat protruding portion 26.

[0054] As described above, in the sliding bearing 2 according to this embodiment, one of the upper shoe 10 and the lower shoe 20 is octagonal in plan view, and the other of the upper shoe 10 and the lower shoe 20 is hexagonal in plan view. A part (upper flat protruding portion 16) of the upper flat protruding portion 16 in the upper shoe 10 and the lower flat protruding portion 26 in the lower shoe 20 is an ultra-flat protruding portion in which the distance between both legs in the trapezoid is longer than the other flat protruding portions. For the upper shoe 10 or the lower shoe 20 provided with the ultra-flat protruding portion, the fixing portion of the upper shoe 10 or the lower shoe 20 to the upper structure U or the lower structure L can be made longer. Therefore, the sliding bearing 2 can be more reliably fixed to the upper structure U and the lower structure L while suppressing the area occupied by the sliding bearing 2 in a plan view.

[0055] (Modification of the second embodiment) The upper shoe 10 may be octagonal in plan view, and the lower shoe 20 may be hexagonal in plan view. In this case, the lower flat protruding portion 26 of the lower shoe 20 becomes an ultra-flat protruding portion in which the distance between both legs in the trapezoid shape is longer than that of the upper flat protruding portion 16.

[0056] Third embodiment Next, with reference to FIG. 10, a sliding bearing 3 according to a third embodiment of the present invention will be described. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and only the differences will be described.

[0057] In this embodiment, an upper recessed portion 14b (recessed portion) is formed in the upper shoe 10, and a lower recessed portion 24b (recessed portion) is formed in the lower shoe 20. Note that the recessed portions 14b, 24b may be formed in only one of the upper shoe 10 and the lower shoe 20.

[0058] The upper recessed portion 14b is provided in the upper protruding portion 14. The upper recessed portion 14b is formed so as to be recessed upward from the lower surface of the upper shoe 10. The upper recessed portion 14b is formed so as to be recessed from the side surface 10a of the upper shoe 10. For example, the upper recessed portion 14b is formed by cutting.

[0059] The lower recessed portion 24b is provided in the lower protruding portion 24. The lower recessed portion 24b is formed so as to be recessed downward from the upper surface of the lower shoe 20. The lower recessed portion 24b is formed so as to be recessed from the side surface 20a of the lower shoe 20. For example, the lower recessed portion 24b is formed by cutting.

[0060] As described above, in the sliding bearing 3 according to this embodiment, at least one of the upper shoe 10 and the lower shoe 20 has the recessed portions 14b, 24b formed in a state recessed from the side surfaces 10a, 20a. By forming the recessed portions 14b, 24b in at least one of the upper shoe 10 and the lower shoe 20, a working space for attaching the fastening member F can be secured. Generally, when a working space for attaching the fastening member cannot be secured between the lower structure and the lower surface of the upper shoe, or between the upper structure and the upper surface of the lower shoe, a box cutout portion can be formed in the lower structure to secure the space. In the sliding bearing 3 according to this embodiment, since a working space for attaching the fastening member F can be secured by forming the recessed portions 14b, 24b as described above, the depth of the box cutout portion can be reduced or the box cutout portion can be made unnecessary.

[0061] (Fourth embodiment) Next, a seismic isolation structure 300 according to a fourth embodiment of the present invention will be described with reference to FIGS. The seismic isolation structure 300 of this embodiment includes, in addition to the upper structure U, the lower structure L, and the sliding bearing 1, a second upper structure U1, a second lower structure L1, and a second sliding bearing 6 shown in Figure 11.

[0062] As shown in Fig. 13, in a seismic isolation structure 300, a sliding bearing 1 is used for base isolation. In the illustrated example, the substructure L is a footing. A first fire-resistant covering material 301 is provided around the sliding bearing 1. The first fire-resistant covering material 301 is provided so as to cover the sliding bearing 1. Note that the configuration of the sliding bearing 1 is similar to that of the sliding bearing 1 in the first embodiment, and therefore description thereof will be omitted here.

[0063] In the seismic isolation structure 300, the second sliding bearing 6 is used for mid-story seismic isolation. Specifically, the second upper structure U1 and the second lower structure L1 face each other in the vertical direction. The second sliding bearing 6 is disposed between the second upper structure U1 and the second lower structure L1. When an earthquake motion occurs, the second sliding bearing 6 displaces the second upper structure U1 and the second lower structure L1 relative to each other in the horizontal direction. This suppresses the vibration of the second lower structure L1 from being transmitted to the second upper structure U1. The second sliding bearing 6 is disposed in the middle layer of a structure such as a building. For example, the second upper structure U1 is the upper layer of the structure, and the second lower structure L1 is the lower layer of the structure. The second sliding bearing 6 may be used for column head seismic isolation in the mid-story seismic isolation. In this case, the second lower structure L1 is the column head of the column. In addition, a second fireproof covering material 302 is provided around the second sliding bearing 6. The second fire-resistant covering material 302 is provided so as to cover the second sliding bearing 6 .

[0064] In the illustrated example, the lower structure L and the second lower structure L1 are integrally formed in the seismic isolation structure 300. However, the lower structure L and the second lower structure L1 may be formed so as to be movable relative to each other.

[0065] The second sliding bearing 6 has a second upper shoe 60, a second lower shoe 70, and a second slider 80 that slides between the second upper shoe 60 and the second lower shoe 70.

[0066] The second upper shoe 60 is disposed under the second upper structure U1. The second upper shoe 60 is fixed to the second upper structure U1 by fastening members F such as bolts so as to be immovable relative to the second upper structure U1. The second upper shoe 60 is a rectangular plate material in a plan view. The second upper shoe 60 is formed from rolled steel material for welding steel (SM490A, B, C, or SN490B, C, or S45C) or the like.

[0067] The lower surface of the second upper shoe 60 is provided with a second upper sliding surface 61 which is a concave spherical surface. The second upper sliding surface 61 is formed in a circular shape in a plan view. A stainless steel sliding plate (not shown) is fixed to the second upper sliding surface 61. In addition, a second upper stopper ring 62 which is annular in a plan view is fixed to the outer periphery of the sliding plate to the second upper sliding surface 61. In the following description, a virtual axis that passes through the center of the second upper sliding surface 61 in a plan view and extends in the vertical direction is referred to as the axis of the second upper shoe 60. The axis of the second upper shoe 60 coincides with the center of gravity of the outer shape of the second upper shoe 60 in a plan view.

[0068] Each of the four corners of the second upper shoe 60 is provided with a second upper fastening portion 64 that is fastened to the second upper structure U1 by a fastening member F. The second upper fastening portion 64 is provided with a second upper mounting hole 64a (second mounting hole) for mounting the fastening member F. The second upper mounting hole 64a penetrates the second upper shoe 60 in the plate thickness direction of the second upper shoe 60.

[0069] The second upper fastening portion 64 is formed with a second upper recessed portion 65 (second recessed portion) that forms a working space S for attaching the fastening member F. The second upper recessed portion 65 is formed so as to be recessed upward from the lower surface of the second upper shoe 60. The second upper recessed portion 65 is formed so as to be recessed from the side surface 60a of the second upper shoe 60. For example, the second upper recessed portion 65 is formed by cutting.

[0070] The second lower shoe 70 is disposed on the upper part of the second lower structure L1. The second lower shoe 70 is fixed to the second lower structure L1 by fastening members F such as bolts so as not to move relative to the second lower structure L1. The second lower shoe 70 is a rectangular plate material in a plan view. The second lower shoe 70 is formed from rolled steel material for welding steel material (SM490A, B, C, or SN490B, C, or S45C) or the like. In this embodiment, the second upper shoe 60 and the second lower shoe 70 have the same shape.

[0071] The upper surface of the second lower shoe 70 is provided with a second lower sliding surface 71, which is a concave spherical surface. The second lower sliding surface 71 is formed in a circular shape in a plan view. A stainless steel sliding plate (not shown) is fixed to the second lower sliding surface 71. In addition, a second lower stopper ring 72, which is annular in a plan view, is fixed to the outer periphery of the sliding plate to the second lower sliding surface 71. In the following description, a virtual axis that passes through the center of the second lower sliding surface 71 in a plan view and extends in the vertical direction is referred to as the axis of the second lower shoe 70. The axis of the second lower shoe 70 coincides with the center of gravity of the outer shape of the second lower shoe 70 in a plan view.

[0072] Each of the four corners of the second lower shoe 70 is provided with a second lower fastening portion 74 that is fastened to the second lower structural body L1 with a fastening member F. The second lower fastening portion 74 is provided with a second lower mounting hole 74a (second mounting hole) for mounting the fastening member F. The second lower mounting hole 74a penetrates the second lower shoe 70 in the plate thickness direction of the second lower shoe 70.

[0073] The second lower fastening portion 74 is formed with a second lower recessed portion 75 (second recessed portion) that forms a working space S for attaching the fastening member F. The second lower recessed portion 75 is formed so as to be recessed downward from the upper surface of the second lower shoe 70. The second lower recessed portion 75 is formed so as to be recessed from the side surface 70a of the second lower shoe 70. For example, the second lower recessed portion 75 is formed by cutting.

[0074] The second slider 80 is disposed between the second upper shoe 60 and the second lower shoe 70. The second slider 80 has a substantially cylindrical shape. The second slider 80 has a second upper sliding surface 81 and a second lower sliding surface 82, which are convex spherical surfaces. The second slider 80 is formed from rolled steel material for welding steel material (SM490A, B, C, or SN490B, C, or S45C), stainless steel material (SUS304, SUS316), or the like. The second slider 80 has a surface pressure of 60 N / mm 2 It has a load-bearing strength of about (60 MPa).

[0075] The second upper sliding surface 81 is in slidable contact with the second upper sliding surface 61, and the second lower sliding surface 82 is in slidable contact with the second lower sliding surface 71. In order to facilitate sliding of the second slider 80 relative to the second upper shoe 60 and the second lower shoe 70, the second upper sliding surface 81 and the second lower sliding surface 82 are provided with, for example, a friction material.

[0076] The second slider 80 slides between the second upper shoe 60 and the second lower shoe 70, allowing the second upper shoe 60 and the second lower shoe 70 to move relative to each other in the horizontal direction. As a result, when ground vibrations caused by earthquake motion are transmitted to the second lower shoe 70, the second lower shoe 70 moves relative to the second upper shoe 60. This movement prevents vibrations of the second lower structure L1 caused by earthquake motion from being transmitted to the second upper structure U1 via the second upper shoe 60.

[0077] Next, the positional relationship between the second upper shoe 60 and the second lower shoe 70 will be described. As described above, when an earthquake motion occurs, the second upper shoe 60 and the second lower shoe 70 move relatively in the horizontal direction. In the following description, unless otherwise specified, the positional relationship between the second upper shoe 60 and the second lower shoe 70 in the initial state in which the second upper shoe 60 and the second lower shoe 70 do not move relatively in the horizontal direction will be described.

[0078] In the initial state, the second upper shoe 60 and the second lower shoe 70 are arranged so that the axis of the second upper shoe 60 and the axis of the second lower shoe 70 coincide with each other. The second upper shoe 60 and the second lower shoe 70 are arranged so that the planar postures of the second upper shoe 60 and the second lower shoe 70 coincide with each other. That is, the second upper shoe 60 and the second lower shoe 70 are arranged so that the corners of the second upper shoe 60 and the corners of the second lower shoe 70 overlap with each other in a planar view. The position of the corners of the second upper shoe 60 in the circumferential direction coincides with the position of the corners of the second lower shoe 70 in the circumferential direction. The second upper fastening portion 64 (second upper recessed portion 65) and the second lower fastening portion 74 (second lower recessed portion 75) are arranged so that they overlap with each other in a planar view.

[0079] As described above, the seismic isolation structure according to this embodiment further comprises, in addition to the upper structure U, the lower structure L, and the sliding bearing 1, the second upper structure U1, the second lower structure L1 facing the second upper structure U1, and the second sliding bearing 6 disposed between the second upper structure U1 and the second lower structure L1. The second sliding bearing 6 comprises a second upper shoe 60 fixed to the second upper structure U1 by a fastening member F, and a second lower shoe 70 fixed to the second lower structure L1 by a fastening member F. At least one of the second upper shoe 60 and the second lower shoe 70 has second recessed portions 65, 75 forming a working space S for attaching the fastening member F, recessed from the side surfaces 60a, 70a. The second upper shoe 60 and the second lower shoe 70 are polygonal in plan view, and the circumferential position of a corner of the second upper shoe 60 coincides with the circumferential position of a corner of the second lower shoe 70. The second sliding bearing 6 is an intermediate layer seismic isolation disposed between the second upper structure U1 as the upper layer of the building and the second lower structure L1 as the lower layer of the building. By forming the second recessed portions 65, 75 in at least one of the second upper shoe 60 and the second lower shoe 70, a working space S for attaching the fastening member F can be secured. In addition, since the circumferential position of the corner of the second upper shoe 60 and the circumferential position of the corner of the second lower shoe 70 coincide with each other, the area occupied by the second sliding bearing 6 in a plan view can be reduced. Therefore, the freedom of design of the seismic isolation structure is improved. In addition, since the area occupied by the second sliding bearing 6 in a plan view can be reduced, the installation area of ​​the second fire-resistant covering material 302 provided to cover the second sliding bearing 6 can be reduced. As shown in FIG. 13, when the second fire-resistant covering material 302 is arranged below the ceiling, the installation area of ​​the second fire-resistant covering material 302 can be reduced, so that the deterioration of the appearance due to the installation of the second fire-resistant covering material 302 can be suppressed.

[0080] The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications are possible within the technical scope of the present invention.

[0081] For example, the sliding bearings 1, 2, and 3 in the above embodiment are so-called double pendulum type sliding bearings in which the upper sliding surface 11, which is a concave spherical surface, is provided on the lower surface of the upper shoe 10, the lower sliding surface 21, which is a concave spherical surface, is provided on the upper surface of the lower shoe 20, and the sliding surfaces slide at two points between the upper sliding surface 11 and the upper sliding surface 31, and between the lower sliding surface 21 and the lower sliding surface 32. However, the present invention is not limited to this, and may be a so-called single pendulum type sliding bearing in which the upper sliding surface 11 is provided only on the upper shoe 10 and the sliding surface slides at one point between the upper sliding surface 11 and the upper sliding surface 31, or the lower sliding surface 21 is provided only on the lower shoe 20 and the sliding surface slides at one point between the lower sliding surface 21 and the lower sliding surface 32. Alternatively, the sliding bearing may be a so-called flat sliding bearing in which the upper sliding surface 11 of the upper shoe 10 and the lower sliding surface 21 of the lower shoe 20 are flat surfaces. One of the upper sliding surface 11 of the upper shoe 10 and the lower sliding surface 21 of the lower shoe 20 may be a concave spherical surface, and the other may be a flat surface.

[0082] In the sliding bearing 2 according to the second embodiment, the upper shoe 10 may be formed with the upper recessed portion 14b, and the lower shoe 20 may be formed with the lower recessed portion 24b.

[0083] Moreover, in the seismic isolation structure according to the fourth embodiment, the sliding bearing 2 or 3 according to the second or third embodiment may be used in place of the sliding bearing 1 according to the first embodiment.

[0084] In the seismic isolation structure according to the fourth embodiment, one of the second upper shoe 60 and the second lower shoe 70 may be octagonal in plan view, and the other may be hexagonal in plan view. One of the second upper shoe 60 and the second lower shoe 70 may be octagonal in plan view, and the other may be rectangular in plan view.

[0085] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate.

[0086] Various aspects of the present disclosure are summarized below as appendices.

[0087] (Appendix 1) A sliding bearing disposed between an upper structure and a lower structure facing the upper structure, An upper shoe fixed to the upper structure by a fastening member; A lower shoe fixed to the lower structure by a fastening member, The upper shoe and the lower shoe have protruding portions that do not overlap with each other in a plan view, The protruding portion is provided with a mounting hole for mounting the fastening member, The protruding portion has a flat protruding portion that is trapezoidal in plan view. Sliding bearing.

[0088] (Appendix 2) The upper shoe and the lower shoe are octagonal in plan view, and the protruding portion of the upper shoe and the protruding portion of the lower shoe are all flat protruding portions. Attachment 1. A sliding bearing as described in Appendix 1.

[0089] (Appendix 3) The flat protruding portion of the upper shoe and the flat protruding portion of the lower shoe all have the same shape and size. Sliding bearing as described in Appendix 2.

[0090] (Appendix 4) One of the upper shoe and the lower shoe is octagonal in plan view, and the other of the upper shoe and the lower shoe is hexagonal in plan view, The flat protruding portion of the upper shoe and a part of the flat protruding portion of the lower shoe are super-flat protruding portions in which the distance between both legs in a trapezoid shape is longer than the other flat protruding portions. Attachment 1. A sliding bearing as described in Appendix 1.

[0091] (Appendix 5) A recessed portion is formed in at least one of the upper shoe and the lower shoe so as to recess from a side surface. 5. A sliding bearing according to any one of claims 1 to 4.

[0092] (Appendix 6) One of the upper shoe and the lower shoe is rectangular in plan view. Attachment 1. A sliding bearing as described in Appendix 1.

[0093] (Appendix 7) A sliding bearing according to any one of appendices 1 to 6, A sliding bearing construction structure comprising: a fixing member connecting the side surfaces of the upper shoe and the lower shoe which intersect with each other in a plan view.

[0094] (Appendix 8) A sliding bearing according to any one of appendices 1 to 7; The upper structure; The lower structure; Equipped with The sliding bearing is a base isolation structure fixed to the lower structure as a foundation structure; Earthquake-resistant structure.

[0095] (Appendix 9) A second superstructure; and a second lower structure facing the second upper structure; a second sliding bearing disposed between the second upper structure and the second lower structure; Further equipped with The second sliding bearing is a second upper shoe fixed to the second upper structure by a fastening member; a second lower shoe fixed to the second lower structure by a fastening member; Equipped with a second recessed portion that forms a working space for attaching the fastening member is formed in at least one of the second upper shoe and the second lower shoe so as to recess from a side surface, the second upper shoe and the second lower shoe are polygonal in plan view, and the position of a corner of the second upper shoe in a circumferential direction about an axis of the second upper shoe in plan view coincides with the position of a corner of the second lower shoe in the circumferential direction; The second sliding bearing is an intermediate layer seismic isolation disposed between the second upper structure as the upper layer of the building and the second lower structure as the lower layer of the building. Seismic isolation structures as described in Appendix 8. [Explanation of symbols]

[0096] 1, 2, 3 Sliding bearing 6 Second sliding bearing 10 Kamikutsu 14 Upper protruding part (protruding part) 14a Upper mounting hole (mounting hole) 14b Upper recess (recess) 15 Upper flat protruding part (flat protruding part) 16 Upper flat protruding part (flat protruding part, super flat protruding part) 20 Lower shoe 24 Lower protruding part (protruding part) 24a Lower mounting hole (mounting hole) 24b Lower recess (recess) 25, 26 Lower flat protruding part (flat protruding part) 30 Slider 50 Fixing member 60 2nd Kamikutsu 65 Second upper recess (second recess) 70 2nd lower shoe 75 Second lower recess (second recess) 80 2nd slider 100 Seismic isolation structures 200 Sliding bearing construction structure L Substructure L1 2nd lower structure U superstructure U1 2nd superstructure

Claims

1. A sliding bearing disposed between an upper structure and a lower structure facing the upper structure, An upper shoe fixed to the upper structure by a fastening member; A lower shoe fixed to the lower structure by a fastening member, The upper shoe and the lower shoe have protruding portions that do not overlap with each other in a plan view, The protruding portion is provided with a mounting hole for mounting the fastening member, The protruding portion has a flat protruding portion that is trapezoidal in plan view. Sliding bearing.

2. The upper shoe and the lower shoe are octagonal in plan view, and the protruding portion of the upper shoe and the protruding portion of the lower shoe are all flat protruding portions.

2. A sliding bearing according to claim 1.

3. The flat protruding portion of the upper shoe and the flat protruding portion of the lower shoe all have the same shape and size. A sliding bearing according to claim 2.

4. One of the upper shoe and the lower shoe is octagonal in plan view, and the other of the upper shoe and the lower shoe is hexagonal in plan view, The flat protruding portion of the upper shoe and a part of the flat protruding portion of the lower shoe are super-flat protruding portions in which the distance between both legs in a trapezoid shape is longer than the other flat protruding portions.

2. A sliding bearing according to claim 1.

5. A recessed portion is formed in at least one of the upper shoe and the lower shoe so as to recess from a side surface.

2. A sliding bearing according to claim 1.

6. One of the upper shoe and the lower shoe is rectangular in plan view.

2. A sliding bearing according to claim 1.

7. A sliding bearing according to claim 1; A sliding bearing construction structure comprising: a fixing member connecting the side surfaces of the upper shoe and the lower shoe which intersect with each other in a plan view.

8. A sliding bearing according to claim 1; The upper structure; The lower structure; Equipped with The sliding bearing is a base isolation structure fixed to the lower structure as a foundation structure; Earthquake-resistant structure.

9. A second upper structure; and a second lower structure facing the second upper structure; a second sliding bearing disposed between the second upper structure and the second lower structure; Further equipped with The second sliding bearing is a second upper shoe fixed to the second upper structure by a fastening member; a second lower shoe fixed to the second lower structure by a fastening member; Equipped with a second recessed portion that forms a working space for attaching the fastening member is formed in at least one of the second upper shoe and the second lower shoe so as to recess from a side surface, the second upper shoe and the second lower shoe are polygonal in plan view, and a position of a corner of the second upper shoe in a circumferential direction about an axis of the second upper shoe in plan view coincides with a position of a corner of the second lower shoe in the circumferential direction, The second sliding support is an intermediate layer seismic isolation disposed between the second upper structure as an upper layer of the building and the second lower structure as a lower layer of the building. The seismic isolation structure according to claim 8.

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