Sliding member and seismic isolation device using said sliding member

Abstract

To provide a slide member that reliably causes vibration of an earthquake to slide irrespective of a material of a floor surface.SOLUTION: A slide member (100) includes: a reinforcement material (120) including a slide surface (102) and a non-slide surface (101) provided at an opposite surface to the slide surface (102) and having a thin metallic wire structure constituted of a thin metallic wire; and a slide material (110) including graphite that fills an interval between thin metallic wires constituting the reinforcement material (120).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sliding member used in a seismic isolation device, and to a seismic isolation device using the sliding member. [Background technology]

[0002] In recent years, there has been progress in seismic isolation design technology, which is a disaster mitigation measure such as seismic isolation or vibration control for buildings. In addition, development of seismic isolation technology, such as seismic isolation devices for indoor and outdoor facilities (e.g., furniture, electronic devices, drums, pallets, storage shelves, etc.), has been progressing as a disaster mitigation measure to prevent human injury and / or economic damage caused by collapse due to earthquakes.

[0003] Seismic isolation devices used for indoor and outdoor facilities are individually designed according to the facility and / or floor material used. Because the shape of the isolation device varies depending on the shape of the facility and the floor material, multiple isolation devices must be used when the same facility is located on different floors, or when different facilities are located on the same floor. If an inappropriate isolation device is used, the facility may collapse during an earthquake, resulting in personal injury and / or economic damage.

[0004] Conventionally, seismic isolation devices used in facilities installed indoors and outdoors are composed of a support part fixed to a support and a sliding member that slides on the floor surface or a surface fixed to the floor surface.

[0005] Patent Document 1 discloses a seismic isolation device including a support tool connected to equipment at one end and movable relative to the floor at the other end, and an elastic body with an upper end anchored to the equipment and a lower end anchored to the floor. This seismic isolation device uses the elastic body to damp vibrations during an earthquake, and the support tool moves along the floor with the damped vibrations, thereby preventing the equipment from tipping over and absorbing shaking during an earthquake. The support tool in the seismic isolation device of Patent Document 1 includes a sliding member on the surface that contacts the floor to improve sliding properties. A material containing hexafluoroethylene resin is used for the sliding member.

[0006] Furthermore, Patent Document 2 discloses a system floor equipped with a sliding surface made of stainless steel plate, chrome or other hard-plated steel plate, resin-coated plate containing Teflon material ("Teflon" is a registered trademark), or resin plate containing Teflon material ("Teflon" is a registered trademark). Column bases that support supports are provided slidably on the sliding surface. By arbitrarily adjusting the materials of the sliding surface and column bases, the coefficient of friction can be adjusted to prevent equipment from tipping over during an earthquake. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 10-246286 [Patent Document 2] Patent No. 3626384 Summary of the Invention [Problem to be solved by the invention]

[0008] However, while these members have excellent sliding properties on certain floor surfaces and / or certain equipment, they have the problem of having a high coefficient of friction on some floor surfaces. When resin or the like is used as the sliding material and the floor surface is concrete, as in Patent Document 1, the coefficient of friction between the sliding material and the floor surface becomes high, generating a large moment (overturning moment) during an earthquake, causing the equipment to overturn.

[0009] Furthermore, when the floor is used as a dedicated sliding surface as in Patent Document 2, safety cannot be guaranteed due to weathering of the sliding surface. Also, since it is necessary to provide a sliding surface on part of the floor, the degree of freedom in arranging equipment is reduced.

[0010] In order to solve the above problems, the present invention aims to provide a sliding member that reliably slides earthquake vibrations regardless of the floor material, and also aims to provide a seismic isolation device that uses the sliding member and aims to prevent equipment from toppling over due to an earthquake, regardless of the floor material and type of equipment. [Means for solving the problem]

[0011] In order to solve the above problems, the sliding member of the present invention and the seismic isolation device using the sliding member have the following features.

[0012] (1) The present invention provides a sliding member for use in a seismic isolation device, a sliding surface and a non-sliding surface provided on the opposite side of the sliding surface; a reinforcing material including a thin metal wire structure formed of thin metal wires; and a sliding material containing graphite that fills gaps between the thin metal wires that make up the reinforcing material. 、 The volume occupancy rate of the thin metal wire structure increases in a direction from the sliding surface toward the non-sliding surface along a central axis passing through the non-sliding surface and the sliding surface. It is characterized by the following.

[0013] According to a sliding member having such a configuration, the sliding surface is made of a sliding material containing graphite, so that the sliding surface of the sliding member can slide against the floor surface during an earthquake, even on floor surfaces made of materials including concrete. This prevents equipment from tipping over during an earthquake. Furthermore, the presence of a reinforcing material containing a thin metal wire structure within the sliding member improves durability. Therefore, even when such a sliding member is used on a support with a high load, damage to the sliding member due to shear stress during vibration is suppressed. Furthermore, with a sliding member having such a configuration, the volume occupancy rate of the thin metal wire structure near the sliding surface is smaller than the volume occupancy rate of the thin metal wire structure near the non-sliding surface, so even if the sliding member wears, the exposure of the thin metal wire structure to the floor surface is suppressed. Therefore, the sliding between the sliding member and the floor surface during an earthquake is not hindered, and the support is suppressed from tipping over. Even if the thin metal wire structure is exposed, the exposed ratio of the thin metal wire structure to the sliding surface is not excessive. Therefore, even if the sliding member wears and the thin metal wire structure is exposed during an earthquake, the sliding between the sliding member and the floor surface is maintained, and the support is suppressed from tipping over.

[0016] ( 2 ) The present invention provides a sliding member for use in a seismic isolation device, a sliding surface and a non-sliding surface provided on the opposite side of the sliding surface; a reinforcing material including a thin metal wire structure formed of thin metal wires; a sliding material containing graphite that fills gaps between the thin metal wires that make up the reinforcing material, The volume occupancy of the thin metal wire structure increases in a direction perpendicular to a central axis passing through the non-sliding surface and the sliding surface and going away from the central axis.

[0017] According to a sliding member having such a configuration, the sliding surface is made of a sliding material containing graphite, so that the sliding surface of the sliding member can slide against the floor surface during an earthquake, even on a floor surface made of a material containing concrete. This prevents equipment from tipping over during an earthquake. Furthermore, the presence of a reinforcing material containing a thin metal wire structure within the sliding member improves durability. Therefore, even when such a sliding member is used on a support object with a high load, it prevents the sliding member from being damaged by shear stress during vibration. Furthermore, In a sliding member having such a configuration, the volume occupancy of the thin metal wire structure is greater near the outer surface than near the central axis. Therefore, when the sliding member is fixed to a support, shear fracture of the sliding member, which occurs when loads are concentrated near the outer surface of the sliding member during sliding, is suppressed. Therefore, even if the support is subjected to a high load, it is prevented from tipping over during an earthquake.

[0018] ( 3 ) Furthermore, according to the sliding member of the present invention, it is preferable that a hole is formed that penetrates from the sliding surface to the non-sliding surface.

[0019] A sliding member having such a configuration has a hole formed through it from the sliding surface to the non-sliding surface, so that when the sliding member is used in a seismic isolation device, the other end surface of the support part constituting the seismic isolation device is exposed. A drive part or the like for screwing the support and the support part is provided on the other end surface, and because the drive part or the like is exposed through the through hole, it is easy to join the support and the seismic isolation device using a predetermined tool such as a screwdriver. This allows the seismic isolation device to be joined to a variety of supports, improving the flexibility of the seismic isolation device and, by extension, the sliding member. Therefore, such a sliding member can be attached to a wider variety of supports.

[0020] ( 4 ) The seismic isolation device of the present invention is a seismic isolation device whose upper end is fixed to a support and whose lower end slides relative to a floor surface, a support part having one end fixed to a support; a sliding portion disposed at the other end of the support portion, The sliding portion (1) to ( 3 ) The sliding member according to any one of the preceding claims.

[0021] According to the seismic isolation device of this configuration, it can be fixed to the support regardless of the type of the support, so there is no need to design a seismic isolation device for each support, and the complexity is reduced. 3 ) of Either to Since the sliding member described above is included, it can be used regardless of the floor material. Therefore, a seismic isolation device that is safe and has a high degree of flexibility and can be used in a wide range of applications, regardless of the floor material and the type of support, is provided. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic diagram of a seismic isolation device according to the present invention. [Figure 2] A cross-sectional view taken along a cross section passing through the axial direction of the support portion of the seismic isolation device of the present invention. [Figure 3] 1 is a schematic diagram showing the cross-sectional state of the seismic isolation device of the present invention before the support portion and the sliding portion are in close contact with each other. [Figure 4] FIG. 1 is a cross-sectional view of a sliding member according to a first embodiment of the present invention. [Figure 5] FIG. 4 is a cross-sectional view of a sliding member according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a cross-sectional view of a sliding member according to a third embodiment of the present invention. [Figure 7] FIG. 10 is a cross-sectional view of a sliding member having a through hole formed therein. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the seismic isolation device 1 of the present invention will be described with reference to the following description and drawings. FIG. 1 is a diagram showing a schematic configuration of the seismic isolation device 1 of the present invention. The seismic isolation device 1 of the present invention is a seismic isolation device 1 that is fixed to equipment (examples of supports 2) such as furniture, home appliances, computers, laboratory equipment, measuring equipment, drums, pallets, and storage shelves. The seismic isolation device 1 of the present invention is composed of a support part 15 and a sliding part 10 disposed at the other end of the support part 15. One end of the support part 15 is fixed to the support 2.

[0024] As shown in FIG. 2 , the support portion 15 is a substantially cylindrical member made of metal or organic material. The support portion 15 is provided with a first fastening means 151 extending from one end to the other. The first fastening means 151 is fixed to the support 2 by a predetermined fastening method. For example, the side of the support portion 15 can be externally threaded starting from one end and threaded into a female thread provided on the support 2. The male thread may be formed starting from one end and ending at the other end, or may be formed with any two points between the other end and the first end as the starting and ending points. In this case, a washer or nut can be threaded into the male thread of the support portion 15 to improve the fixation to the support 2. Furthermore, the method of fixing one end of the support portion 15 to the support 2 is not limited to screwing, and may be any method, such as fitting or welding, selected according to the design of the seismic isolation device 1.

[0025] The other end of the support part 15 is provided with second fixing means 152 formed to fix the sliding part 10. By fixing the sliding part 10 to the second fixing means 152, the support part 15 and the sliding part 10 are integrally formed to constitute the seismic isolation device 1. For example, as shown in FIG. 2, the second fixing means 152 is a substantially disc-shaped member having a hole in the center. The hole provided in the center is female-threaded, and is screwed into a male-threaded portion serving as the first fixing means 151 formed on the support part 15. As shown in FIG. 2, the sliding part 10 is tightly fitted and fixed to the support part 15. Because the second fixing means 152 is substantially disc-shaped, the sliding part 10 will not fall off the support part 15, and the sliding part 10 will be fixed to the support part 15. The method of fixing the sliding part 10 and the second fixing means 152 is not particularly limited, but is preferably performed by insert molding, in which the sliding part 10 is compressed against the second fixing means 152 and brought into close contact with each other, thereby integrally forming the support part 15 and the sliding part 10. In this embodiment, the second fixing means 152 is screwed to the first fixing means 151, but this is not limiting, and the other end of the support part 15 and the second fixing means 152 may be welded or adhered.

[0026] In this embodiment, the second fixing means 152 is a substantially disk-shaped member, and the fixing method is tight contact by insert molding, but this is not limited to this. The design can be changed as desired so that the sliding part 10 does not fall off the support part 15. For example, the second fixing means 152 may be configured as a substantially hemispherical shell-shaped member. Also, for example, by forming a groove or male thread on a part of the side surface of the support part 15, the sliding part 10 may be fitted or screwed to the support part 15 and fixed, regardless of the presence or absence of the second fixing means 152.

[0027] When the sliding portion 10 and the support portion 15 are fixed by insert molding, as shown in FIG. 3, before insert molding, the sliding portion 10 is formed as a plate with a recess 11 formed by a sliding member 100 (described later) so that any cross section passing through the central axis L0 is approximately U-shaped. Here, the central axis L0 is a line passing through the geometric centers of gravity of one surface (non-sliding surface) of the sliding portion 10 and another surface (sliding surface) provided on the opposite side of the one surface. The recess 11 is formed on one surface (non-sliding surface) of the sliding portion 10 and has an approximately cylindrical shape centered on the central axis L0. The second fixing means 152 of the support portion 15 is inserted into the recess 11 formed in the sliding portion 10, and the entire sliding portion 10, including the edge portion 12 of the sliding portion 10, is compressed isotropically or anisotropically using a predetermined machine. At this time, the edge 12 of the sliding portion 10 and the entire sliding portion 10 are compressed to a predetermined shape, so that the recess 11 is filled with the sliding portion 10 and the second fixing means 152 and the sliding portion 10 are tightly attached to each other. Therefore, the sliding portion 10 does not fall off the support portion 15, and the sliding portion 10 and the support portion 15 are integrally formed.

[0028] 2 and 3 is preferably cylindrical in shape, but is not limited to being cylindrical, and an optimum shape such as a cylinder, square pillar, or rectangular tube can be selected depending on the seismic isolation device 1. Similarly, the shape of the recess 11 is preferably cylindrical, but is not limited to being cylindrical, and an optimum shape such as a square pillar can be selected depending on the seismic isolation device 1.

[0029] 4 is a cross-sectional view of a sliding member 100 according to a first embodiment, which constitutes the sliding section 10 of the seismic isolation device 1 of the present invention. The sliding member 100 has a non-sliding surface 101 and a sliding surface 102, and is composed of a reinforcing material 120 including a thin metal wire structure and a sliding material 110 including graphite that fills the gaps between the reinforcing material 120. To explain the position and orientation of the components of the sliding member 100, a three-dimensional cylindrical coordinate system (R, θ, Z) is used, with the geometric center of gravity of the sliding surface 102 of the sliding member 100 at pole point O. Here, the Z axis is the central axis L that passes through pole point O and extends toward the geometric center of gravity of the non-sliding surface 101, and the R axis and θ axis are the radial axis and circumferential axis, respectively, of the two-dimensional polar coordinate system (R, θ) on a plane perpendicular to the central axis L.

[0030] As shown in FIG. 7 , when the sliding portion 10 is formed in a cylindrical or rectangular cylindrical shape, it is preferable that the through hole be formed parallel to the Z axis and centered on the pole O. By forming the through hole, the other end surface of the support portion 15 is exposed when the support portion 15 and the sliding portion 10 are screwed together. A drive unit, such as a substantially minus-shaped or substantially plus-shaped drive unit for screwing the support portion 15 and the support 2, is provided on the other end surface of the support portion 15, and the drive unit is exposed to the outside. Therefore, the support portion 15 can be rotated using a predetermined tool such as a screwdriver, facilitating screwing the seismic isolation device 1 and the support 2. The shape of the drive unit is not particularly limited and may be adjusted as desired depending on the design or usage situation. The Z-axis projection shape of the through hole on the sliding surface 102 is preferably circular, but is not limited to a circle. The Z-axis projection shape of the through hole may be any shape, such as an ellipse or a polygon (e.g., a regular hexagon or a regular dodecagon), selected as desired depending on the design or usage situation. Furthermore, the Z-axis projection shape of the through-hole may or may not change with respect to the sliding surface 102. The diameter may increase or decrease from the sliding surface 102 to the exposed surface of the drive unit, or a combination of these may be used. The shape of the through-hole is not a limitation of the present invention and may be adjusted as desired by those skilled in the art.

[0031] According to the sliding member 100 of the first embodiment, the reinforcing material 120 is evenly distributed throughout the entire sliding member 100. In this case, it is preferable that the weight of the reinforcing material 120 is 10 to 80% by weight of the total weight, and the volume occupancy is 1 to 52% by volume of the total volume, but this is not limited to this and may be adjusted as desired depending on the characteristics of the seismic isolation device 1 used.

[0032] The reinforcement member 120 is composed of a fine metal wire structure. The fine metal wire structure is a mesh made of a metal selected from a specific metal, but is not limited thereto and may be any structure formed from fine metal wires. The diameter of the fine metal wire is not particularly limited and can be selected arbitrarily depending on the seismic isolation device 1 used. For example, when the seismic isolation device 1 supports a heavy-load support 2, the fine metal wire must be able to withstand high loads, so the diameter of the fine metal wire is preferably 0.05 mm or more and 0.80 m or less. Furthermore, since the fine metal wire may be subject to galvanic corrosion with the sliding material 110 containing graphite, it is preferable to select a metal with a natural corrosion potential close to that of graphite in order to suppress corrosion. The fine metal wire is preferably selected from at least one of stainless steel wire, plated iron wire, and brass wire, but is not limited thereto and may be selected from any metal depending on the environment in which it is used and / or the characteristics of the seismic isolation device 1. The fine metal wire structure of the present invention may also be formed from multiple fine metal wires of different diameters and / or multiple fine metal wires selected from different materials.

[0033] The sliding material 110 filling the gaps between the reinforcing material 120 is mainly made of graphite. Expanded graphite is used as the graphite, and the expanded graphite and the metal thin wire structure are abutted against each other and compressed to a density of 1.2 to 2.0 g / cm. 3 The gaps between the thin metal wire structure are filled by compressing the thin metal wire structure to a density of 100. At this time, the support part 15 and the sliding part 10 formed by the sliding member 100 are further insert-molded, so that the support part 15 and the sliding part 10 are closely attached to each other and are integrally formed.

[0034] FIG. 5 is a cross-sectional view of a sliding member 100 according to a second embodiment of the present invention. In the sliding member 100 according to the second embodiment, the volume occupancy of the reinforcing material 120 increases along the Z axis (the direction from the sliding surface 102 to the non-sliding surface 101). While FIG. 5 shows a predetermined increasing trend of the volume occupancy, this is not limiting. Depending on the seismic isolation device and / or the support 2, the increasing trend may be monotonic, such as linear or exponential, or discontinuous (monotonic). The increasing trend is adjusted as desired depending on the seismic isolation device and / or the support 2. Here, the volume occupancy in the Z direction indicates the ratio of the volume of the reinforcing material 120 to the volume of the sliding member 100 enclosed by any two cross sections (R-θ planes) perpendicular to the Z axis. The volume occupancy in the Z direction can also be determined by image analysis of a cross section along the central axis L (for example, a cross section such as that shown in FIG. 5).

[0035] FIG. 6 is a cross-sectional view of a sliding member 100 according to a third embodiment of the present invention. According to the sliding member 100 according to the third embodiment, the volume occupancy of the reinforcing material 120 increases along the R direction (the direction away from the central axis L). While FIG. 6 shows a predetermined increasing trend of the volume occupancy, this is not limiting. Depending on the seismic isolation device and / or the support 2, the increasing trend may be a continuous monotonic increase, such as a linear increase or an exponential increase, or a discontinuous monotonic increase. The increasing trend is adjusted as desired depending on the seismic isolation device and / or the support 2. Here, the volume occupancy in the R direction indicates the ratio of the volume of the reinforcing material 120 to the volume of the sliding member 100 enclosed by any two cylinders with the central axis L as their axes. The volume occupancy in the R direction can also be determined by image analysis of any one or more cross sections perpendicular to the Z axis. [Example]

[0036] Example 1 Example 1 is a seismic isolation device 1 using the sliding member 100 according to the first embodiment. In this case, stainless steel wire was used as the thin metal wire serving as the reinforcing member 120, and expanded graphite was used as the graphite serving as the sliding member 110.

[0037] According to Example 1, even if an earthquake occurs, good sliding occurs between the floor surface and the sliding part 10, so shaking can be absorbed and / or suppressed. Furthermore, good sliding is maintained even when used on a concrete floor, so even on an uneven floor surface, the support 2 is prevented from tipping over, thereby reducing human and / or economic damage. Furthermore, since it is threaded, it can be easily installed. Therefore, the simple installation structure increases the degree of installation flexibility and can be used for various supports 2. Furthermore, the reinforcing member 120 improves durability, suppressing shear failure caused by shaking during an earthquake.

[0038] Example 2 Example 2 is a seismic isolation device 1 using the sliding member 100 according to the second embodiment. According to the sliding member according to Example 2, the volume occupancy rate of the reinforcing member 120 relative to the overall volume of the sliding member 100 increases monotonically along the direction along the central axis L (Z direction, the direction from the non-sliding surface 101 toward the sliding surface 102). The configurations of the reinforcing member 120 and the sliding member 110 and the manufacturing method for the seismic isolation device are substantially the same as those in Example 1, and therefore will not be described to avoid redundancy.

[0039] According to the second embodiment, the reinforcing material 120 covers the periphery of the support portion 15 of the seismic isolation device 1, thereby improving resistance to the load applied to the support portion 15. Furthermore, during an earthquake, the sliding portion 10 smoothly slides the seismic vibrations without exposing the reinforcing material 120. Furthermore, since the sliding portion 10 has resistance to the shear stress generated during an earthquake, it can reliably absorb and / or suppress the vibrations without shear failure of the sliding portion 10.

[0040] Example 3 Example 3 is a seismic isolation device 1 using the sliding member 100 according to the third embodiment. According to the sliding member according to Example 2, the volume occupancy rate of the reinforcing member 120 relative to the overall volume of the sliding member 100 increases monotonically along the radial direction (direction R, direction away from the central axis L). The configurations of the reinforcing member 120 and sliding member 110 and the manufacturing method for the seismic isolation device are substantially the same as those of Example 1, and therefore will not be described to avoid redundancy.

[0041] According to the third embodiment, the reinforcing material 120 covers the periphery of the support part 15 of the seismic isolation device 1, thereby improving the resistance to the load applied to the support part 15. Since the reinforcing material 120 has resistance to the shear stress generated during an earthquake, the sliding part 10 does not suffer shear failure, and vibrations can be reliably absorbed and / or suppressed. [Explanation of symbols]

[0042] 1: seismic isolation device, 2: support, 10: sliding part, 11: recess, 12: edge, 15: support, 100: sliding member, 101: non-sliding surface, 102: sliding surface, 105: side, 110: sliding material, 120: reinforcing material, 151: first fixing means, 152: second fixing means, O: pole, L: central axis

Claims

1. A sliding member used in a seismic isolation device, a sliding surface and a non-sliding surface provided on the opposite side of the sliding surface; a reinforcing material including a thin metal wire structure formed of thin metal wires; a sliding material containing graphite that fills gaps between the thin metal wires that make up the reinforcing material, A sliding member, characterized in that the volume occupancy of the thin metal wire structure increases in a direction from the sliding surface toward the non-sliding surface along a central axis passing through the non-sliding surface and the sliding surface.

2. A sliding member used in a seismic isolation device, a sliding surface and a non-sliding surface provided on the opposite side of the sliding surface; a reinforcing material including a thin metal wire structure formed of thin metal wires; a sliding material containing graphite that fills gaps between the thin metal wires that make up the reinforcing material, A sliding member, characterized in that the volume occupancy of the thin metal wire structure increases in a direction perpendicular to a central axis passing through the non-sliding surface and the sliding surface and away from the central axis.

3. The sliding member according to claim 1 or 2, A sliding member, characterized in that a hole is formed through the sliding surface to the non-sliding surface.

4. A seismic isolation device whose upper end is fixed to a support and whose lower end slides relative to the floor surface, a support part having one end fixed to a support; a sliding portion disposed at the other end of the support portion, A seismic isolation device, wherein the sliding portion includes the sliding member according to claim 1 or 2.

5. A seismic isolation device whose upper end is fixed to a support and whose lower end slides relative to the floor surface, a support part having one end fixed to a support; a sliding portion disposed at the other end of the support portion, A seismic isolation device, wherein the sliding portion includes the sliding member according to claim 3.

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