sliding bearing

Abstract

To provide a lightweight and inexpensive slide bearing having a lower shoe and an upper shoe by paying attention to the upper and lower shoes, which are simple in shape but account for the majority of the cost of the slide bearing.SOLUTION: A slide bearing 1 of the present invention comprises: a lower shoe 10 having a V-shaped concave-like lower sliding contact surface 132 on its upper surface in a first direction and fixed above a lower structure 2 of a structure; an upper shoe 20 having an inverted V-shaped concave-like upper sliding contact surface 232 on its lower surface in a second direction orthogonal to the first direction on the horizontal plane and fixed below an upper structure 3 of the structure; and a slider 30 having a lower sliding surface slidable with respect to the lower sliding contact surface 132 and an upper sliding surface slidable with respect to the upper sliding contact surface 232. The lower shoe 10 and the upper shoe 20 are provided with an outer frame 11 made of steel, and a cement-based material filled in an internal space S1 formed by the outer frame 11.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a sliding bearing. [Background technology]

[0002] Conventionally, in the support structure of a seismically isolated building in which an upper structure such as a building is supported by a lower structure such as a foundation, a sliding bearing has been known that is disposed between the upper structure and the lower structure of the structure and supports the upper structure so that it can slide horizontally relative to the lower structure during an earthquake. As shown in Patent Document 1, for example, such a sliding bearing comprises a lower shoe fixed to the top of the lower structure of the structure, an upper shoe fixed to the bottom of the upper structure of the structure, and a slider interposed between the lower shoe and the upper shoe.

[0003] The structure in Patent Document 1 is composed of upper and lower steel shoes and a slider that connects them and slides on a friction surface. The upper and lower surfaces of the slider are fitted with friction materials that come into contact with the inclined surface. The frictional resistance generated when the slider slides on the friction surface serves as a damping force, and the weight of the structure acts on the inclined friction surface to generate a tilt restoring force. Furthermore, vibration experiments have confirmed that residual displacement can be almost eliminated by setting the relationship between the friction coefficient μ of the friction material and the inclination angle θ to approximately tan θ = (0.2 to 0.4) μ. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-130216 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the sliding bearing of Patent Document 1 requires all components except the friction material to be machined from thick steel, resulting in poor yield and time-consuming and costly manufacturing. Furthermore, the steel used is heavy, which creates problems in terms of the burden it places on transportation and installation.

[0006] The present invention was made in consideration of these circumstances, and focuses on the upper and lower shoes, which are simple in shape but account for more than half of the cost of a sliding bearing, with the aim of providing a sliding bearing with lightweight and inexpensive lower and upper shoes. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following means. A sliding bearing according to a first aspect of the present invention is a sliding bearing comprising: a lower shoe having a V-shaped concave lower sliding contact surface on its upper surface in a first direction and fixed to the upper part of a lower structure of a structure; an upper shoe having an inverted V-shaped concave upper sliding contact surface on its lower surface in a second direction perpendicular to the first direction on the horizontal plane and fixed to the lower part of an upper structure of a structure; and a slider having a lower sliding surface that can slide against the lower sliding contact surface and an upper sliding surface that can slide against the upper sliding contact surface, wherein the lower shoe and the upper shoe comprise an outer frame formed of a steel material and a cement-based material filled in an internal space formed by the outer frame. The outer frame includes a main body formed in a substantially rectangular parallelepiped shape with a recess in the center in the longitudinal direction, and a plate-like base plate arranged to cover one surface of the main body. Filling holes for filling the cement-based material into the internal space are formed on the lower surface of the lower shoe and the upper surface of the upper shoe of the outer frame, and two filling holes are formed symmetrically from the center of the base plate. .

[0008] In the present invention, the lower shoe and the upper shoe are configured by filling the inside of an outer frame made of steel with a cement-based material, so that the lower shoe and the upper shoe can be made lighter while maintaining their performance compared to conventional lower shoes and upper shoes made entirely of steel. In addition, since cement-based materials are cheaper than steel, manufacturing costs can be reduced. Furthermore, the sliding bearing has filling holes formed on the bottom surface of the lower shoe and the top surface of the upper shoe. Therefore, the outer frame acts as a formwork, and the filling holes are set on the top surface, and cement-based material can be filled into the internal space from here, making it easy to manufacture the sliding bearing.

[0009] In the sliding bearing according to the present invention, the cement-based material may be mortar.

[0010] In this case, the density of the steel is 7850 kg / m 3 In contrast, the density of mortar is approximately 2100 kg / m 3Therefore, by using mortar as the cementitious material, the weight of the lower and upper shoes can be reduced. Also, like cementitious materials, mortar is cheaper than steel, so manufacturing costs can be reduced. Furthermore, because the filled mortar is covered by the steel outer frame, tensile stress is less likely to occur, and even if cracks do occur, the crack width does not increase, allowing the upper and lower shoes to maintain their function as rails for the sliders.

[0011] In the sliding bearing according to the present invention, the lower sliding contact surface and the upper sliding contact surface may be formed of stainless steel.

[0012] In this case, by forming the lower sliding contact surface of the lower shoe and the upper sliding contact surface of the upper shoe from stainless steel, adhesion with the sliding surface (friction material) of the slider is prevented, rust is less likely to occur, and the corrosion resistance of the sliding bearing can be improved. Furthermore, since the sliding bearing has a small coefficient of friction between the friction material of the sliding surface and stainless steel, good slidability or sliding performance can be ensured between the lower sliding contact surface or upper sliding contact surface and the sliding surface of the slider.

[0013] In addition, the sliding bearing according to the present invention is characterized in that the compressive strength of the cement-based material is 50 N / mm 2 or more (=50 MPa or more).

[0014] In this case, the long-term reference surface pressure (= allowable compressive stress) generated on the sliding surface (friction material) of a general slider is 20 MPa, and the compressive strength of the mortar is 50 N / mm 2 If this is the case, then by increasing the compressive strength of the mortar by more than twice, it is possible to manufacture a sliding bearing with sufficient strength. [Effects of the Invention]

[0017] According to the sliding bearing of the present invention, attention is focused on the upper and lower shoes, which are simple in shape but account for more than half of the cost of the sliding bearing, and it is possible to provide a sliding bearing with lightweight and inexpensive lower and upper shoes. [Brief explanation of the drawings]

[0018] [Figure 1]1 is a perspective view of a sliding bearing according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] 2. (a) is a cross-sectional view taken along line AA in FIG. 2, and (b) is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. 1(a) is a diagram showing the slider of the sliding bearing as viewed from above, and FIG. 1(b) is a diagram showing the slider of the sliding bearing as viewed from below. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of the present invention will be described with reference to FIGS.

[0020] As shown in Fig. 3, the sliding bearing 1 in this embodiment supports an upper structure 3 relative to a lower structure 2, such as the foundation of a high-rise building, so that the upper structure 3 can slide horizontally in response to vibrations caused by wind, earthquakes, etc. This sliding bearing 1 includes a lower shoe 10 fixed to the upper surface of the lower structure 2, an upper shoe 20 fixed to the lower surface of the upper structure 3, and a slider 30 interposed between the lower shoe 10 and the upper shoe 20. Here, in this embodiment, as shown in Figs. 3(a) and 3(b), the vertical direction is defined as the Z direction, with the upper structure 3 side defined as the upper side and the lower structure 2 side defined as the lower side. Furthermore, on a horizontal plane perpendicular to the Z direction, the longitudinal direction of the lower shoe 10 is defined as the X direction (first direction), and the direction perpendicular to the X direction and corresponding to the longitudinal direction of the upper shoe 20 is defined as the Y direction (second direction).

[0021] 1, 2, and 3(a), the lower shoe 10 is provided below the slider 30 (described later) in the Z direction, and is a member that allows the slider 30 to slide in one direction (X direction). The lower shoe 10 includes a lower shoe outer frame 11 and an internal space S1 formed by the lower shoe outer frame 11. The lower shoe outer frame 11 of the lower shoe 10 is composed of a lower shoe main body 100 and a lower base plate 110.

[0022] The lower shoe body 100 (outer frame) is a block body formed in a rectangular parallelepiped shape with its longitudinal direction extending along the X direction and its center recessed in the longitudinal direction. The lower shoe body 100 includes a lower shoe sliding plate 130 on the top and lower shoe side parts 120 that extend downward from a periphery 131 of the lower shoe sliding plate 130 to an upper surface 112 of the lower base plate 110.

[0023] The lower shoe sliding plate 130 is a plate-shaped plate member provided above the lower shoe 10. The lower shoe sliding plate 130 has a lower sliding surface 132 on its upper surface and is entirely made of stainless steel. The lower sliding surface 132 of the lower shoe sliding plate 130 slides against a lower friction material 311 of the slider 30 (described later). Because the lower sliding surface 132 is made of stainless steel, it prevents adhesion with the lower sliding surface 311a of the lower friction material 311 provided on the slider 30 (described later) and reduces rusting. Therefore, the lower sliding surface 132 can improve the corrosion resistance of the sliding bearing 1. In addition, good sliding properties can be ensured between the lower sliding surface 132 and the lower sliding surface 311a of the slider 30. In a side view, the lower sliding surface 132 of the lower shoe sliding plate 130 is formed into a gently V-shaped concave shape. The lower shoe sliding plate 130 is not limited to being made of stainless steel, but may be made of metals such as titanium, cast steel, or cast iron. The lower sliding surface 132 of the lower shoe sliding plate 130 may be subjected to surface treatment such as polishing or coating. Furthermore, the lower shoe sliding plate 130 may be made of general structural steel, with a stainless steel plate or the like welded only to the lower sliding surface 132, ensuring good sliding properties. The joint between the lower shoe sliding plate 130 and the lower shoe side portion 120 is formed, for example, by drilling a screw hole in the lower shoe sliding plate 130 and attaching it to the lower shoe side portion 120 with a flat head screw or the like. Other joining methods, such as welding, may also be used for this joint and the joint between the lower shoe sliding plate 130 and the lower shoe side portion 120.

[0024] The lower shoe side portion 120 includes a pair of lower shoe side walls 121 erected on both side surfaces in the Y direction, and a pair of lower shoe end walls 122 erected on both end surfaces in the X direction.

[0025] The pair of lower shoe side walls 121 face each other in the Y direction, extend along the X direction, and have their lower portions welded to the lower base plate 110. The upper portions of the lower shoe side walls 121 are formed in a gentle V-shape to match the shape of the lower shoe sliding plate 130. The outer surfaces 121a of the lower shoe side walls 121 slide against the lower surface friction material 313 of the slider 30, which will be described later. Like the lower shoe sliding plate 130, the lower shoe side walls 121 are entirely made of stainless steel, which ensures good sliding properties between the lower shoe side walls 121 and the lower surface friction material 313. Note that the lower shoe sliding plate 130 and the lower shoe side walls 121 are not limited to being made of stainless steel, and may be made by welding a stainless steel plate to a steel plate or by coating the surface of a steel plate.

[0026] The pair of lower shoe end walls 122 are rectangular plates facing each other in the X direction and having approximately the same shape and dimensions, and like the lower shoe side parts 120, are joined by welding or the like at their upper parts to the lower shoe sliding plate 130 and at their lower parts to the lower base plate 110. The lower shoe end walls 122 are formed, for example, from general structural steel or the like.

[0027] The lower surface 111 of the lower base plate 110 (outer frame) is bonded and fixed to the upper surface of the lower structure 2. Like the lower shoe end wall 122, the lower base plate 110 is formed of, for example, general structural steel. The lower base plate 110 is set larger than the periphery 131 of the lower shoe sliding plate 130 so that the lower shoe side portion 120 extending vertically downward from the periphery 131 of the lower shoe sliding plate 130 abuts against the upper surface 112. The lower surface 111 of the lower base plate 110 is provided with a filling hole (not shown) that can fill the internal space S1 of the lower shoe 10, which will be described later, with mortar M. Two filling holes are formed symmetrically from the center of the lower base plate 110. Note that it is sufficient to provide at least one filling hole. Furthermore, the size of the filling hole is preferably large enough to easily fill with mortar M. The abutting portions of the lower base plate 110 and the lower shoe side portions 120 are integrated by, for example, fillet welding. The abutting portions of the lower base plate 110 and the lower shoe side portions 120 may be continuously welded, intermittently welded, or spot welded.

[0028] The internal space S1 is an internal space portion of the lower shoe 10 formed by abutting the lower shoe main body 100, which is the lower shoe outer frame 11, and the lower base plate 110 together by welding or the like. The internal space S1 is filled with mortar M (cement-based material) made by mixing cement, sand (fine aggregate), water, and, if necessary, admixtures, through the filling holes in the lower base plate 110. This mortar M is a non-shrink mortar, and has a design value of compressive strength of approximately 50 N / mm 2 It is preferable that the filling material is equal to or more than that. The filling material is not limited to mortar M, but may be any cement-based material such as concrete or paste. The setting retardation of mortar M may be adjusted as appropriate depending on the order of pouring the filling holes in the lower base plate 110, the process, etc.

[0029] 1, 2, and 3(b), the upper shoe 20 is provided above the slider 30 (described later) in the Y direction, and is a member on which the slider 30 can slide in one direction (the Y direction). Similar to the above-mentioned lower shoe 10, the upper shoe 20 includes an upper shoe outer frame 21 and an internal space S2 formed by the upper shoe outer frame 21. The upper shoe outer frame 21 of the upper shoe 20 is composed of an upper shoe main body 200 and an upper base plate 210.

[0030] The upper shoe body 200 (outer frame) is a block body formed in a rectangular parallelepiped shape with its longitudinal direction extending along the Y direction and its center recessed in the longitudinal direction. The upper shoe body 200 includes an upper shoe sliding plate 230 on the lower side, and upper shoe side parts 220 that stand upright from the periphery 231 of the upper shoe sliding plate 230 upward to the lower surface 211 of the upper base plate 210.

[0031] The upper shoe sliding plate 230 is a plate-shaped plate member provided below the upper shoe 20. The upper shoe sliding plate 230 has an upper sliding contact surface 232 on its lower surface and is entirely made of stainless steel. The upper sliding contact surface 232 of the upper shoe sliding plate 230 slides against an upper friction material 312 of the slider 30 (described later). Because the upper sliding contact surface 232 is made of stainless steel, it prevents adhesion with the upper sliding surface 312a of the upper friction material 312 provided on the slider 30 (described later) and is less likely to rust. Therefore, the upper sliding contact surface 232 can improve the corrosion resistance of the sliding bearing 1. In addition, good sliding properties can be ensured between the upper sliding contact surface 232 and the upper sliding surface 312a of the slider 30. In side view, the upper sliding contact surface 232 of the upper shoe sliding plate 230 is formed into a gentle inverted V-shaped concave shape. The upper shoe sliding plate 230 is not limited to being made of stainless steel, but may be made of metals such as titanium, cast steel, or cast iron. The upper sliding contact surface 232 of the upper shoe sliding plate 230 may be subjected to surface treatment such as polishing or coating. Furthermore, the upper shoe sliding plate 230 may be made of general structural steel, with a stainless steel plate or the like welded only to the upper sliding contact surface 232, thereby ensuring good sliding properties. The joint between the upper shoe sliding plate 230 and the upper shoe side portion 220 is formed, for example, by drilling a screw hole or the like in the upper shoe sliding plate 230 and attaching a countersunk head screw or the like to the upper shoe side portion 220. Other joining methods, such as welding, may also be used for this joint and the joint between the upper shoe sliding plate 230 and the upper shoe side portion 220.

[0032] The upper shoe side portion 220 includes a pair of upper shoe side walls 221 erected on both side surfaces in the X direction, and a pair of upper shoe end walls 222 erected on both end surfaces in the Y direction.

[0033] The pair of upper shoe side walls 221 face each other in the X direction, extend along the Y direction, and have their upper portions welded to the upper base plate 210. The upper portions of the upper shoe side walls 221 are formed in a gentle inverted V shape to match the shape of the upper shoe sliding plate 230. The outer surfaces 221a of the upper shoe side walls 221 slide against the upper surface friction material 314 of the slider 30, which will be described later. Like the upper shoe sliding plate 230, the upper shoe side walls 221 are entirely made of stainless steel, which ensures good sliding properties between the upper shoe side walls 221 and the upper surface friction material 314. Note that the upper shoe sliding plate 230 and the upper shoe side walls 221 are not limited to being made of stainless steel, and may be made by welding a stainless steel plate to a steel plate or coating the surface of a steel plate.

[0034] The pair of upper shoe end walls 222 face each other in the Y direction and are rectangular plates of approximately the same shape and dimensions, and like the upper shoe side parts 220, their lower parts are joined by welding or the like to the upper shoe sliding plate 230 and their upper parts to the upper base plate 210. The upper shoe end walls 222 are formed, for example, from general structural steel or the like.

[0035] As shown in FIG. 3( b), the upper base plate 210 (outer frame) has an upper surface 212 bonded and fixed to the lower surface of the upper structure 3. Like the upper shoe end wall 222, the upper base plate 210 is formed of, for example, general structural steel. The upper base plate 210 is set larger than the periphery 231 of the upper shoe sliding plate 230 so that the upper shoe side portion 220, which extends vertically upward from the periphery 231 of the upper shoe sliding plate 230, abuts against the lower surface 211. As shown in FIG. 1, the upper surface 212 of the upper base plate 210 is provided with a filling hole H that can fill the internal space S2 of the upper shoe 20, which will be described later, with mortar M. Two filling holes H are formed symmetrically from the center of the upper base plate 210. It is sufficient that at least one filling hole H is provided. Furthermore, the size of the filling hole H is preferably large enough to allow mortar M to be easily filled. The abutting portions of the upper base plate 210 and the upper shoe side portions 220 are integrated by, for example, fillet welding. The abutting portions of the upper base plate 210 and the upper shoe side portions 220 may be continuously welded, intermittently welded, or spot welded.

[0036] The internal space S2 is an internal space portion of the upper shoe 20 formed by abutting the upper shoe main body 200, which is the upper shoe outer frame 21, and the upper base plate 210 together by welding or the like. The internal space S2 is filled with a material substantially the same as the mortar M filled into the internal space S1 of the lower shoe 10 described above through the filling holes H of the upper base plate 210 described above.

[0037] 3, the slider 30 is interposed between the lower shoe 10 and the upper shoe 20 in the Z direction. The slider 30 includes a slider body 300 and a friction material 310, as shown in FIG.

[0038] As shown in Fig. 4, the slider body 300 is made of a block body formed in a substantially square shape. As shown in Fig. 4(b), the lower surface 301 of the slider body 300 is formed to protrude from both ends in the X direction toward the center, and is molded into a gentle V-shaped convex shape. As shown in Fig. 4(a), the upper surface 302 of the slider body 300 is formed to protrude from both ends in the Y direction toward the center, and is molded into a gentle inverted V-shaped convex shape. The slider body 300 further has a lower guide portion 320 below the slider body 300 and an upper guide portion 330 above the slider body 300.

[0039] As shown in FIG. 4(b), the lower guide portions 320 are a pair of guide portions provided on both sides of the lower surface of the slider main body. The lower guide portions 320 are provided on the slider main body 300 so as to protrude downward from the lower surface 301 of the slider main body 300. The pair of lower guide portions 320 are provided on the lower shoe main body 100 via lower surface friction materials 313 (described later) so as to sandwich the lower shoe main body 100 from the lower shoe side portions 120. The lower guide portions 320 are movable only in the direction along the lower shoe side portions 120. Due to the configuration of the lower guide portions 320, the slider 30 is held relative to the lower shoe 10 so as to be slidable only in the X direction.

[0040] The upper guide portions 330 are a pair of guide portions provided on both sides of the upper surface 302 of the slider body 300. The upper guide portions 330 are provided on the slider body 300 so as to protrude upward from the upper surface 302 of the slider body 300. The pair of upper guide portions 330 are provided on the upper shoe body 200 via upper surface friction materials 314 (described later) so as to sandwich the upper shoe body 200 from the upper shoe side portions 220. The upper guide portions 330 are movable only in the direction along the upper shoe side portions 220. Due to the configuration of the upper guide portions 330, the slider 30 is held relative to the upper shoe 20 so as to be slidable only in the Y direction.

[0041] The friction material 310 is a plate-shaped member provided on the slider body 300 and has a friction-damping effect. The friction material 310 is formed, for example, from a PTFE (polytetrafluoroethylene)-based or PA (polyamide)-based resin, which has good sliding properties. The material of the friction material 310 is not limited to a resin material and may be, for example, a sintered metal. Furthermore, the material of the friction material 310 may be a composite material made of a thermosetting resin binder, a fiber material, a friction modifier, a filler, etc., or a layered friction material. In this case, examples of the material include aramid fiber, glass fiber, vinylon fiber, and carbon fiber. The friction material 310 includes a lower friction material 311, an upper friction material 312, a lower side friction material 313, and an upper side friction material 314.

[0042] 4(b), the lower friction members 311 are a pair of friction members attached along the lower surface 301 of the slider body 300. The lower friction members 311 have a lower sliding surface 311a corresponding to the lower sliding contact surface 132 of the lower shoe 10, along which the slider 30 slides on the lower shoe 10. 4(a), the upper friction members 312 are a pair of friction members attached along the upper surface 302 of the slider body 300. The upper friction members 312 have an upper sliding surface 312a corresponding to the upper sliding contact surface 232 of the upper shoe 20, along which the slider 30 slides against the upper shoe 20.

[0043] As shown in FIG. 4(b), the lower surface friction material 313 is provided on the lower guide portion 320 and is a plurality of friction materials arranged between the lower guide portion 320 and the lower shoe 10, and slides against the outer surface 121a of the lower shoe side wall 121 when the slider 30 slides on the lower shoe 10. As shown in FIG. 4(a), the upper surface friction material 314 is provided on the upper guide portion 330 and is a plurality of friction materials arranged between the upper guide portion 330 and the upper shoe 20, and slides against the outer surface 221a of the upper shoe side wall 221 when the slider 30 slides on the upper shoe 20. In this embodiment, a plurality of lower side surface friction members 313 and a plurality of upper side surface friction members 314 are attached to the slider 30, but the number of such members is not particularly limited.

[0044] In the sliding bearing 1 of this embodiment, the friction coefficient between the lower sliding contact surface 132 of the lower shoe 10 and the lower sliding surface 311a of the lower friction material 311 provided on the lower surface 301 of the slider body 300, and the friction coefficient between the upper sliding contact surface 232 of the upper shoe 20 and the upper sliding surface 312a of the upper friction material 312 provided on the upper surface 302 of the slider 30, are both set to the same friction coefficient μ. Furthermore, the inclination angle of the lower sliding contact surface 132 with respect to the horizontal plane and the inclination angle of the upper sliding contact surface 232 with respect to the horizontal plane are both set to the same inclination angle θ. The friction coefficient μ and the inclination angle θ are preferably set to satisfy the relationship tan θ = (0.1 to 0.4) μ. This allows for the desired restoring force to be obtained, which attempts to return the slider 30 to its original position, thereby suppressing residual displacement in the sliding bearing 1 after an earthquake and preventing excessive response acceleration in the structure.

[0045] (action) Next, the operation of the sliding bearing 1 according to this embodiment will be described with reference to FIGS. In the sliding bearing 1 of the present invention, a slider 30 is interposed between a lower shoe 10 and an upper shoe 20. A pair of lower guide portions 320 of the slider 30 is held slidably only in the X direction relative to the lower shoe 10 via a lower friction material 311 and a lower-side friction material 313. Furthermore, a pair of upper guide portions 330 of the slider 30 is held slidably only in the Y direction relative to the upper shoe 20 via an upper friction material 312 and an upper-side friction material 314. Furthermore, the sliding bearing 1 is installed with a filling hole H formed in the lower base plate 110 facing upward, and mortar M is filled from this filling hole H into an internal space S1 surrounded by the lower shoe outer frame 11. In the sliding bearing 1, mortar M is filled from a filling hole H formed in the upper base plate 210 into an internal space S2 surrounded by the upper shoe outer frame 21. The mortar M is filled in with the V-shaped lower shoe sliding plate 130 and upper shoe sliding plate 230 facing downward. Therefore, the lower shoe 10 and upper shoe 20 are less likely to have gaps on the backside of the lower shoe sliding plate 130 and upper shoe sliding plate 230 that slide in contact with the friction material 310 of the slider 30, ensuring sufficient strength required of the lower shoe 10 and upper shoe 20. As the filled mortar M hardens, it is integrated with the steel material of the lower shoe outer frame 11 and upper shoe outer frame 21.

[0046] In the sliding bearing 1, when a relative displacement occurs in any horizontal direction (X direction and Y direction) between the lower structure 2 and the upper structure 3, the slider 30 displaces in the X direction relative to the lower sliding contact surface 132 of the lower shoe 10, while displacing in the Y direction relative to the upper sliding contact surface 232 of the upper shoe 20. Therefore, the slider 30 can be displaced in accordance with the relative displacement in any horizontal direction (X direction and Y direction) that occurs between the lower structure 2 and the upper structure 3. Note that, as shown in FIGS. 1 to 3, in the original position under normal conditions, the slider 30 is disposed in the center of the lower shoe 10 in the X direction and in the center of the upper shoe 20 in the Y direction. At this time, the maximum surface pressure generated on the friction material 310 of the slider 30 is 15 N / mm 2 (Long term load)~40N / mm 2 (Short-term load).

[0047] As described above, the sliding bearing 1 according to this embodiment has the filling holes H in the lower base plate 110 and the upper base plate 210, so that the mortar M can be poured smoothly.

[0048] In this embodiment, the mortar M filled in the internal space S1 and the internal space S2 has a design value of 50 N / mm 2 For the above reasons, the sliding bearing 1 can ensure sufficient compressive strength against the maximum surface pressure generated on the friction material 310 described above.

[0049] Furthermore, in this embodiment, the sliding bearing 1 maintains the vibration isolation performance of conventionally known sliding bearings, while being made lighter by filling the internal spaces S1 and S2 of the lower shoe 10 and upper shoe 20 with mortar M. Furthermore, since mortar M is less expensive than steel, the manufacturing costs of the sliding bearing 1 can be reduced. Furthermore, since the sliding bearing 1 is lighter than conventionally known sliding bearings, lighter heavy machinery can be used during work, improving work efficiency and reducing construction costs. Furthermore, since steel is used only in the lower shoe outer frame 11 and upper shoe outer frame 21 of the lower shoe 10 and upper shoe 20, the larger the size of the sliding bearing 1, the greater the proportion of the shoe width that is taken up by mortar M, which is expected to have a significant cost-saving effect.

[0050] Furthermore, in this embodiment, since mortar M is filled into the internal space S1 and the internal space S2 and the lower shoe outer frame 11 and the upper shoe outer frame 21 are surrounded by steel, tensile stress is less likely to occur in the mortar M, cracking is suppressed, and stable performance equivalent to that of conventional lower shoes and upper shoes made entirely of steel can be maintained.

[0051] The present invention is not limited to the above-described embodiment. The components in the embodiment include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that fall within the so-called equivalent range. Furthermore, the components disclosed in the embodiment can be combined as appropriate.

[0052] For example, in this embodiment, the internal spaces S1, S2 are formed by the lower shoe outer frame 11 and the upper shoe outer frame 21, but the internal spaces of the present invention are not limited to this. For example, the internal space S may be formed by carving out a single piece of steel material. Also, the lower shoe side portion 120 and the upper shoe side portion 220, which form part of the lower shoe main body 100 (outer frame) and the upper shoe main body 200 (outer frame), may be omitted, and mortar may be poured into the internal space formed by temporary formwork, which may then be removed after hardening (in this case, both ends of the lower shoe 10 and the upper shoe 20 will be mortar surfaces instead of steel).

[0053] In addition, in this embodiment, the internal spaces S1 and S2 are filled with mortar M, but the material to be filled is not limited to mortar M and may be any cement-based material such as concrete or paste. Also, the internal spaces S1 and S2 may be filled with steel, stone, concrete, or the like, and the gaps may be filled with mortar or the like.

[0054] In addition, in this embodiment, guide portions 320, 330 are provided on the lower and upper sides of the slider 30, respectively. However, a guide portion may be provided on only one of the upper and lower sides of the slider 30, and the other side may be slidably held by a guide portion provided on the shoe side, as in Patent Document 1.

[0055] Furthermore, although the guide portions 320 and 330 are formed integrally with the slider body 300, they may be provided separately from the slider body 300. Furthermore, although the slider 30 in this embodiment is configured to slide relative to the lower shoe 10 and the upper shoe 20 via a friction material and a sliding plate, the slider 30 may be configured to slide directly relative to the lower shoe 10 and the upper shoe 20 without the friction material or sliding plate as long as the friction resistance can be kept low.

[0056] Other configurations such as the shape, length, and dimensions of the sliding bearing can be set appropriately taking into consideration the components to which it is applied. Furthermore, the components in the above-described embodiments can be replaced with well-known components as appropriate, without departing from the spirit of the present invention. [Explanation of symbols]

[0057] 1. Sliding bearing 2. Lower structure 3 Superstructure 10 Lower shoe 11 Lower shoe outer frame (outer frame) 110 Lower base plate 132 Bottom sliding surface 20 Kamikutsu 21 Upper shoe outer frame (outer frame) 210 Upper base plate 232 Surface contact surface 30 Slider 300 Slider body 310 Friction material 320 Lower guide part 330 Upper guide part 311a Lower sliding surface 312a Upper sliding surface S1, S2 interior space H filling hole M Mortar (cement-based material)

Claims

1. a lower shoe having a V-shaped concave lower sliding surface on an upper surface thereof in a first direction and fixed above a lower structure of a structure; an upper shoe having an inverted V-shaped concave upper sliding contact surface on its lower surface in a second direction perpendicular to the first direction on a horizontal plane, the upper shoe being fixed below an upper structure of a structure; A sliding bearing comprising a lower sliding surface that can slide against the lower sliding contact surface, and a slider having an upper sliding surface that can slide against the upper sliding contact surface, The lower shoe and the upper shoe are made of an outer frame formed of a steel material, A cement-based material filled in an internal space formed by the outer frame; Equipped with the outer frame includes a main body formed in a substantially rectangular parallelepiped shape with a recess in the center in the longitudinal direction, and a plate-like base plate arranged to cover one surface of the main body, a filling hole for filling the cement-based material into the internal space is formed in a lower surface of the lower shoe and an upper surface of the upper shoe of the outer frame; The two filling holes are formed symmetrically on the left and right sides from the center of the base plate.

2. The cement-based material is mortar.

2. A sliding bearing according to claim 1.

3. The lower sliding contact surface and the upper sliding contact surface are made of stainless steel. A sliding bearing according to claim 1 or claim 2.

4. The cementitious material has a compressive strength of 50 N / mm ２ That's all A sliding bearing according to any one of claims 1 to 3.

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