JP6723426B1 - Slip isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip isolation device excellent in maintainability. A sliding seismic isolation device (50) includes a pedestal (10), a ball seat (20) provided on the surface of the pedestal (10) and having a first concave spherical surface (23), and a first concave spherical surface (23). A movable body 30 having a one-convex spherical surface 31, a second convex spherical surface 32 on the opposite side of the first convex spherical surface 31, and a first friction material 33 attached to the surface of the second convex spherical surface 32; The concave seat 32 is provided with a second concave spherical surface 42 on which the convex spherical surface 32 slides, and the ball seat 20 is detachably arranged on the receiving base 10. [Selection diagram] Figure 1

Description

The present invention relates to a slip isolation device.

In Japan, which is an earthquake-prone country, various types of seismic resistance are being applied to various structures such as buildings, bridges, elevated roads, and detached houses, such as technology to withstand seismic force and technology to reduce seismic force entering structures. Technology, seismic isolation technology, and vibration control technology have been developed and applied to various structures. Above all, the seismic isolation technology is a technology for reducing the seismic force itself entering the structure, and therefore the vibration of the structure during an earthquake is effectively reduced. An outline of this seismic isolation technology is to interpose a seismic isolation device between the foundation, which is the lower structure, and the upper structure to reduce the transmission of foundation vibration due to an earthquake to the upper structure. To ensure structural stability. The seismic isolation device is effective not only in the event of an earthquake but also in reducing the influence of traffic vibrations that constantly act on the structure on the upper structure.

There are various types of seismic isolation devices such as a lead rubber laminated rubber bearing device, a high damping laminated rubber bearing device, a combined rubber bearing and damper device, and a sliding seismic isolation device. Among them, there are plane slip isolation devices and spherical slide isolation devices as slip isolation devices, and although the plane slide isolation devices do not have restoring force, the spherical slip isolation devices have restoring force and It has a self-centering function.

By the way, in the slip isolation device, there is a single-sided slip isolation device (single-type slip isolation device) in which only one surface is a shoe (sliding plate) having a concave spherical surface. In this single-sided sliding seismic isolation device, the movable body has a first convex spherical surface and a second convex spherical surface above and below, for example, the first convex spherical surface is accommodated in the first concave spherical surface provided in the cradle, The movable body is configured to be movable inside the concave spherical surface.

A spherical sliding bearing device, which is such a single-sided sliding seismic isolation device, has been proposed. Specifically, it has a concave spherical surface member having a concave spherical surface, an opposing member having a concave spherical surface formed thereon, and a convex spherical surface, and the convex spherical surface is slidably contacted with the concave spherical surface of the concave spherical member. On the other hand, the spherical sliding bearing device further includes another convex spherical surface, and the movable body has the other convex spherical surface slidably abutted on the concave spherical surface of the facing member. In this spherical slide bearing device, the concave spherical member is integrally formed with the concave spherical member main body and the concave spherical concave portion of one surface of the concave spherical member main body, and the exposed surface forms a low friction layer. (For example, see Patent Document 1).

JP, 09-310409, A

According to the spherical sliding bearing device described in Patent Document 1, it is possible to reduce the frictional resistance at the contact surface between the concave spherical member and the movable body, and to ensure easy sliding displacement at the contact surface. .. By the way, due to the long-term use of the slip isolation device, especially the parts that require maintenance or replacement are attached to the rising part of the pedestal that accommodates the movable body that rotates in various modes and the sliding surface of the movable body. It is a friction material. However, in the conventional slip-isolation device including Patent Document 1, the plate portion and the rising portion rising upward from the plate portion are integrated, so that the plate portion and the rising portion can be maintained during maintenance of the rising portion. It is necessary to remove the whole (a pedestal consisting of) from between a lower structure (for example, a foundation) and an upper structure (for example, a pillar) for maintenance, which causes excessive maintenance.

An object of the present invention is to provide a slip isolation device having excellent maintainability.

In order to achieve the above object, one aspect of the slip isolation device according to the present invention is:
A cradle,
A ball seat provided on the surface of the pedestal and having a first concave spherical surface,
A first convex spherical surface accommodated in the first concave spherical surface, a second convex spherical surface on the opposite side of the first convex spherical surface, and a first friction material attached to the surface of the second convex spherical surface. Body and
A shoe having a second concave spherical surface on which the second convex spherical surface slides,
The ball seat is detachably attached to the pedestal.

According to this aspect, the ball seat for accommodating the movable body and the pedestal attached to the lower structure or the upper structure are separated, and the ball seat is detachably arranged with respect to the cradle. Since only the ball seat that requires maintenance can be removed from the pedestal for maintenance, the maintainability is significantly improved compared to the conventional slip isolation device. In addition, since the movable body can be easily removed from the accommodated ball seat, the first friction material attached to the sliding surface of the movable body can be easily maintained. The first friction material includes, for example, PTFE fibers (polytetrafluoroethylene) and fibers having higher tensile strength than PTFE fibers (high-strength fibers such as PPS fibers (polyphenylenesulfide, polyphenylene sulfide)). The double woven fabric and the like formed by

The sliding seismic isolation device of this aspect is intended for both spherical sliding seismic isolation devices and flat sliding seismic isolation devices, and the pedestal is fixed, for example, on the lower structure, and the shoe is fixed under the upper structure. (Or, the opposite form may be possible) is a single-sided seismic isolation device in which a shoe slides with respect to a movable body.

Another aspect of the slip isolation device according to the present invention is characterized in that a plurality of oil passages are provided on either one of the first concave spherical surface and the first convex spherical surface.

According to this aspect, since the plurality of oil passages are provided on one of the first concave spherical surface and the first convex spherical surface, the movable surface (sliding surface) of the movable body (sliding surface) is removed without removing the movable body from the ball seat. The grease can be spread all over the moving surface).

Further, since the pedestal and the ball seat are separated, it is possible to machine the oil passage to the first concave spherical surface of the ball seat and the first convex spherical surface of the movable body, which are as small members as possible. , The workability is improved.

In another aspect of the slip isolation device according to the present invention, an oil sump is provided at a point of the plurality of oil passages, and an oil injection hole is provided on an outer peripheral surface of the ball seat or an outer peripheral surface of the movable body. The oil injection hole communicates with the oil passage.

According to this aspect, the oil injection hole is provided in one of the first concave spherical surface of the ball seat and the first convex spherical surface of the movable body, and the oil injection hole is provided so that the plurality of oil passages described above communicate with each other. In addition to the fact that an oil sump is provided at the point of the oil passage, in addition to allowing grease to spread over the entire movable surface (sliding surface) of the movable body without removing the movable body from the ball seat, Since grease can be stored in a plurality of oil reservoirs, once the grease is once provided to the movable surface of the movable body, it is not necessary to provide the grease again for as long as possible. Also, since the pedestal and the ball seat are separated, it is necessary to process the oil passage and the oil reservoir on the first concave spherical surface of the ball seat and the first convex spherical surface of the movable body, which are as small as possible. Therefore, the workability is improved.

As for the mounting form of the ball seat on the pedestal, the ball seat is placed on a flat surface of the pedestal and both are fixed by bolts, and the seat where the lower end of the ball seat fits on the surface of the pedestal. Examples thereof include a mode in which a counterbore is provided and the lower end of the ball seat is dropped and fixed in the counterbore, and a mode in which the lower end of the ball seat is dropped into the counterbore and further fixed by a bolt or the like. In the form in which the lower end of the ball seat is dropped and fixed in the counterbore groove of the pedestal, part or all of the shearing force that acts on the ball seat during an earthquake is borne by the drop part of the ball seat into this counterbore groove. It will be possible.

Another aspect of the slip isolation device according to the present invention is characterized in that a second friction material is attached to either one of the first concave spherical surface and the first convex spherical surface.

According to this aspect, since the second friction material is attached to one of the first concave spherical surface of the spherical seat and the first convex spherical surface of the movable body, there is a concern that grease may run out on the movable surface of the movable body. Without, it is possible to ensure a sliding function as long as possible. As the second friction material, for example, a double woven fabric made of PTFE fibers and PPS fibers can be applied as in the first friction material.

Further, another aspect of the slip isolation device according to the present invention is characterized in that the pedestal is arranged on a lower structure, and the lumber is arranged under an upper structure. And

According to this aspect, the pedestal is disposed and fixed on the lower structure, and the movable body is accommodated in the first concave spherical surface of the ball seat disposed on the pedestal. The device can be easily attached and the ball seats and the like can be easily maintained.

Further, another aspect of the slip isolation device according to the present invention is characterized in that the pedestal is arranged under an upper structure, and the trough is arranged on a lower structure. And

According to this aspect, the pedestal is arranged under the upper structure, and the movable body is housed in the first concave spherical surface of the ball seat that faces downward below the pedestal. It becomes difficult for rainwater or the like to enter the first concave spherical surface, which is the surface, and the maintenance period can be extended.

As can be understood from the above description, according to the slip isolation device of the present invention, it is possible to provide a slip isolation device having excellent maintainability.

It is a disassembled perspective view of the slip isolation device which concerns on 1st Embodiment. It is a II direction arrow view of FIG. 1, and is a top view which looked at the ball seat from the upper part. It is a longitudinal cross-sectional view of the slip isolation device according to the first embodiment. It is a disassembled perspective view of the slip isolation device which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view of the slip isolation device according to the second embodiment.

Hereinafter, the slip isolation device according to each embodiment will be described with reference to the accompanying drawings. In the present specification and the drawings, substantially the same components may be denoted by the same reference numerals to omit redundant description.

[Slip isolation device according to the first embodiment]
First, an example of the slip isolation device according to the first embodiment will be described with reference to FIGS. 1 to 3. Here, FIG. 1 is an exploded perspective view of the slip isolation device according to the first embodiment, and FIG. 2 is a view taken in the direction of arrow II in FIG. 1, showing a plan view of a ball seat from above. Is. Moreover, FIG. 3 is a vertical cross-sectional view of the slip isolation device according to the first embodiment.

The slip isolation device 50 includes a pedestal 10, a ball seat 20 provided on the surface 11 of the pedestal 10 and having a first concave spherical surface 23, and a first convex spherical surface accommodated in the first concave spherical surface 23. A movable body 30 which is provided with a second convex spherical surface 32 on the opposite side of the first convex spherical surface 31, and a first friction material 33 is attached to the surface of the second convex spherical surface 32; With a second concave spherical surface 42 on which the lower surface 41 slides.

The pedestal 10 has, for example, a rectangular shape (including a square) in a plan view, and has a counterbore groove 12 into which the lower end of the ball seat 20 fits, and a plurality of bolt holes 13 are provided in the counterbore groove 12. It is provided. The shape of the pedestal 10 in plan view is not limited to the illustrated example, and may be circular or the like.

The pedestal 10 is made of rolled steel for welding steel (SM490A, B, C, or SN490B, C, or S45C), or stainless steel (SUS), cast steel, cast iron, reinforced concrete, high hardness plastic, or the like. ing.

The ball seat 20 has a bottom plate 21 which is circular in a plan view and fits into the counterbore groove 12, and a tapered main body 22 which is erected from the bottom plate 21 and has a truncated cone shape. The top surface of the tapered main body 22 has a predetermined curvature. Is provided with a first concave spherical surface 23.

A plurality of bolt holes 25 are provided at the peripheral edge of the bottom plate 21, and when the bottom plate 21 is dropped into the counterbore groove 12, there are bolt holes 25 at positions corresponding to the respective bolt holes 13. The ball seat 20 is attached to the pedestal 10 by screwing the bolt 15 into the bolt holes 13 and 25. That is, in the slip isolation device 50 of the illustrated example, the ball seat 20 is detachably attached to the pedestal 10.

The first concave spherical surface 23 is provided with a plurality of circumferential oil passages 27 and a plurality of radial oil passages 28, and each oil passage 27, 28 has a hemispherical or substantially hemispherical oil reservoir 29 at a point. Is provided. Further, oil injection holes 26 are provided at a plurality of positions (two positions in the illustrated example) on the outer peripheral surface of the tapered main body 22 of the ball seat 20, and the oil injection holes 26 communicate with the radial oil passage 28. ..

In the state where the sliding seismic isolation device 50 shown in FIG. 3 is disposed between, for example, a foundation that is a lower structure and a column that is an upper structure that configures a building, grease G is supplied from the oil injection hole 26. By filling, the grease G is filled in the radial oil passage 28 between the first concave spherical surface 23 and the movable body 30, and is filled in the circumferential oil passage 27 communicating with the radial oil passage 28. It is possible to reach the entire area between the first concave spherical surface 23 and the movable body 30. That is, the grease G can be filled between the first concave spherical surface 23 and the movable body 30 without removing the sliding seismic isolation device 50 from the upper structure or the lower structure.

Further, since the oil sump 29 is provided at the point of each of the oil passages 27 and 28, the grease G is accumulated in each oil sump 29, so that the grease G is kept in the first concave spherical surface 23 for as long as possible. And the movable body 30 can be held.

The movable body 30 includes a first convex spherical surface 31 and a second convex spherical surface 32, and a first friction material 33 is attached to the surface of the second convex spherical surface 32. Here, the ball seat 20 and the movable body 30 described above are formed from rolled steel for welding steel (SM490A, B, C, or SN490B, C, or S45C), or stainless steel (SUS), cast steel, cast iron, or the like. It has a load bearing strength of about 60 N/mm ² (60 MPa).

As shown in FIG. 3, the first convex spherical surface 31 and the first concave spherical surface 23 accommodating the first convex spherical surface 31 have the same curvature, and the second convex spherical surface 32 and the second convex spherical surface 32 slide. The second concave spherical surface 42 of the moving gear 40 also has a similar curvature. The first convex spherical surface 31 made of, for example, a stainless steel surface is preferably a mirror-finished surface.

The first friction material 33 is formed of, for example, a double woven fabric layer made of PTFE fibers and fibers having higher tensile strength than the PTFE fibers. Then, the first friction material 33 is fixed to the surface of the second convex spherical surface 32 such that the PTFE fibers are arranged on the lower surface 41 side of the shoe 40. Here, as “fibers having higher tensile strength than PTFE fiber”, polyamides such as nylon 6.6, nylon 6, nylon 4.6, polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, polyethylene na Fibers such as polyester such as phthalate and para-aramid can be mentioned. Further, fibers such as meta-aramid, polyethylene, polypropylene, glass, carbon, polyphenylene sulfide (PPS), LCP, polyimide and PEEK can be mentioned. Further, heat-bonding fibers or fibers such as cotton and wool may be applied. Among them, PPS fibers having excellent chemical resistance and hydrolysis resistance and extremely high tensile strength are desirable.

In the structure of the double woven fabric, the weft yarn of PPS fiber is arranged on the second convex spherical surface 32 side, and the warp yarn of PPS fiber is knitted as it is wound. In addition, a weft yarn of PTFE fiber is arranged above these (at the position of the shoe 40 side), a warp yarn of the PTFE fiber is knitted so as to wind up the weft yarn of the PTFE fiber, and the warp yarn of the PTFE fiber is further below the PPS fiber. The weft is also woven in such a way that it is also involved. Then, the first friction material 33 made of a double woven fabric is fixed to the second convex spherical surface 32 by an epoxy resin adhesive or the like so that the PTFE fiber is located on the side of the shoe 40.

The lure 40 has a rectangular shape in a plan view, has a second concave spherical surface 42 on which the movable body 30 slides on the lower surface 41, and is made of the same material as the pedestal 10, the movable body 30, and the ball seat 20. There is. In addition, the shoe 40 may have a shape in plan view other than the illustrated example, such as a circle in plan view. The second concave spherical surface 42 made of, for example, a stainless steel surface is preferably a mirror-finished surface.

Although not shown, the pedestal 10 is fixed via a plurality of anchor bolts to a lower structure having a rising portion made of reinforced concrete and a steel base plate arranged on the upper surface of the rising portion. It In addition, the upper 40 is fixed to the upper structure having a reinforced concrete or steel column and a steel base plate arranged on the lower surface of the column by means of a plurality of anchor bolts. The slip isolation device 50 is attached between the structure and the lower structure.

The sliding seismic isolation device 50 of the illustrated example is a single-sided spherical seismic isolation device, and when the seismic force acts on the building, the movable body 30 rotates in the X1 direction within the first concave spherical surface 23 of the ball seat 20. The sewer 40 slides in the X2 direction on the second convex spherical surface 32 of the movable body 30 to reduce the seismic force.

The parts of the sliding seismic isolation device 50 that particularly require maintenance or replacement are the ball seat 20 that houses the rotating movable body 30, and the first friction material 33 that the movable body 30 has. In the seismic isolation device 50, the ball seat 20 that accommodates the movable body 30 and the pedestal 10 that is attached to the lower structure are separated, and the ball seat 20 is detachably disposed on the pedestal 10. Accordingly, since only the ball seat 20 requiring maintenance can be detached from the pedestal 10 for maintenance, the maintainability is remarkably improved as compared with the conventional slip isolation device. Further, since the movable body 30 can be easily removed from the accommodated ball seat 20, the first friction material 33 attached to the sliding surface of the movable body 30 can be easily maintained.

Further, as described above, the radial oil passage 28 and the circumferential oil passage 27 are provided in the first concave spherical surface 23, and the grease G is filled from the oil injection hole 26 so as to be spread over the respective oil passages 27, 28. Thereby, the grease G can be filled between the first concave spherical surface 23 and the movable body 30 without removing the slip isolation device 50 from the upper structure or the lower structure. Further, since the oil sump 29 is provided at the point of each of the oil passages 27 and 28, the grease G is accumulated in each oil sump 29, so that the grease G is kept in the first concave spherical surface 23 for as long as possible. And the movable body 30.

Further, since the pedestal 10 and the ball seat 20 are separated, the oil passages 27, 28 and the oil sump 29 are processed on the first concave spherical surface 23 of the ball seat 20 which is a member as small as possible. Therefore, the workability is improved.

In the sliding seismic isolation device 50 of the illustrated example, the pedestal 10, the ball seat 20, the movable body 30, and the shoe 40 are arranged in this order from the lower structure side, and the shoe 40 is attached to the upper structure. The configuration may be completely opposite, in which the pedestal 10, the ball seat 20, the movable body 30, and the shoe 40 are arranged in this order from the upper structure side, and the shoe 40 is attached to the lower structure. ..

Further, the slip isolation device 50 of the illustrated example has a configuration in which the oil passages 27 and 28 are provided in the first concave spherical surface 23 of the ball seat 20, but instead of the ball seat 20, the first convex of the movable body 30. An oil passage may be provided on the surface of the spherical surface.

Further, the sliding seismic isolation device 50 of the illustrated example has a form in which the first concave spherical surface 23 of the ball seat 20 is provided with the oil passages 27 and 28, the oil sump 29, and the oil injection hole 26. The first concave spherical surface 23 of 20 (or the first convex spherical surface of the movable body 30) may have only the oil passages 27 and 28. According to this embodiment, the machining labor is reduced, It becomes possible to manufacture the slip isolation device at low cost.

[Slip isolation device according to the second embodiment]
Next, an example of the slip isolation device according to the second embodiment will be described with reference to FIGS. 4 and 5. Here, FIG. 4 is an exploded perspective view of the slip isolation device according to the second embodiment, and FIG. 5 is a vertical cross-sectional view of the slip isolation device according to the second embodiment.

The illustrated slip isolation device 50A differs from the slide isolation device 50 in that the second friction material 24 is attached instead of the oil passage on the first concave spherical surface 23 of the ball seat 20A.

Here, as with the first friction material 33, the second friction material 24 may also be applied with a double fabric layer made of PTFE fibers and fibers having higher tensile strength than the PTFE fibers.

According to the sliding seismic isolation device 50A, since the second friction material 24 is attached to the first concave spherical surface 23 of the ball seat 20A, it is possible as much as possible without worrying about running out of grease on the movable surface of the movable body 30. In addition, a long-term sliding function can be secured.

In the illustrated example, the second friction material 24 is attached to the first concave spherical surface 23 of the ball seat 20A, but instead of this, the second friction material is attached to the first convex spherical surface of the movable body 30. It may be in any form.

There may be other embodiments in which other components are combined with the configurations and the like described in the above embodiments, and the present invention is not limited to the configurations shown here. This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form.

10: Cradle 11: Top (front)
12: Counterbore groove 15: Bolt 20, 20A: Ball seat 21: Bottom plate 22: Tapered body 23: First concave spherical surface 24: Second friction material 26: Oil injection hole 27: Circumferential oil passage (oil passage)
28: radial oil passage (oil passage)
29: Oil sump 30: Movable body 31: First convex spherical surface 32: Second convex spherical surface 33: First friction material 40: Recess 41: Lower surface 42: Second concave spherical surface 50, 50A: Sliding seismic isolation device G: Grease

Claims (4)

A cradle,
A ball seat provided on the surface of the pedestal and having a first concave spherical surface,
A first convex spherical surface accommodated in the first concave spherical surface, a second convex spherical surface on the opposite side of the first convex spherical surface, and a first friction material attached to the surface of the second convex spherical surface. Body and
A shoe having a second concave spherical surface on which the second convex spherical surface slides,
The ball seat is detachably arranged with respect to the cradle ,
One of the first concave spherical surface and the first convex spherical surface, a plurality of oil passages are provided ,
An oil reservoir is provided at a point of the plurality of oil passages, an oil injection hole is provided on an outer peripheral surface of the ball seat or an outer peripheral surface of the movable body, and the oil injection hole communicates with the oil passage. Is a seismic isolation device. The second seismic isolation device according to claim 1, wherein a second friction material is attached to one of the first concave spherical surface and the first convex spherical surface. 3. The sliding seismic isolation device according to claim 1, wherein the pedestal is arranged above the lower structure, and the shoe is arranged below the upper structure. .. 3. The sliding seismic isolation device according to claim 1, wherein the pedestal is arranged below the upper structure, and the shoe is arranged above the lower structure. ..

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