JP6573116B2 - Seismic isolation mechanism - Google Patents

Description

  The present invention relates to a seismic isolation mechanism for supporting seismic isolation objects such as buildings and precision equipment.

Conventionally, seismic isolation mechanisms for preventing (suppressing) earthquake damage to buildings and precision equipment are known. For example, in Patent Document 1, a mover that serves as a slider between an upper guide member that is fixed to the bottom of an upper structure to be seismically isolated and a lower guide member that is fixed to the upper part of the lower structure. A seismic isolation mechanism is disclosed. In this seismic isolation mechanism, the sliding surface between the mover and the upper guide member is formed in an inclined surface having an inverted V shape along one horizontal direction, and the sliding surface between the mover and the lower guide member is It is formed in the inclined surface which becomes V shape along the other horizontal direction orthogonal to one horizontal direction.
Since the sliding surface is formed in an inverted V-shaped or V-shaped inclined surface, the mover that slides along the sliding surface has one side of the bent portion where the gradient of the sliding surface changes. The portion that contacts the sliding surface changes on the other side.

JP 2013-130216 A

When the mover slides along the sliding surface, a stick-slip phenomenon occurs in which the mover repeatedly catches or slides on the sliding surface in the vicinity of the bent portion where the gradient of the sliding surface changes, and the upper structure The acceleration may be greater than the theoretical value.
The cause of this stick-slip phenomenon is that the mover moving along the sliding surface becomes high-speed at the gradient switching portion near the bending portion where the portion that contacts the sliding surface changes, so after passing through the bending portion It is conceivable that the portion in contact with the sliding surface comes into contact with the sliding surface at high speed, and an impact force is generated in the upper structure.

In addition, the mover rotates by a setting gap provided between the mover and the sliding surface, so that only the tip portion comes into contact with the sliding surface without any surface contact, The shape of the contact portion with the sliding surface of the child and its aging deformation are also considered to cause the stick-slip phenomenon.
For this reason, the seismic isolation mechanism which can suppress the impact of the contact of the mover and the gradient switching portion of the sliding surface and can smoothly pass through the gradient switching portion of the sliding surface is desired.

  Therefore, an object of the present invention is to provide a seismic isolation mechanism in which a mover can smoothly pass through a slope switching portion of an inverted V-shaped or V-shaped inclined surface (sliding surface). .

In order to achieve the above object, a seismic isolation mechanism according to the present invention is fixed to the bottom of the upper structure in a seismic isolation mechanism provided between an upper structure and a lower structure that are relatively displaceable in a horizontal direction. An upper guide member, a lower guide member fixed to the upper portion of the lower structure, and the upper guide member and the lower guide member, and is relatively displaced in the same horizontal direction as the upper guide member. The lower guide member and a movable element that is relatively displaceable in another horizontal direction orthogonal to the one horizontal direction, and the upper guide member is located on the upper side along the one horizontal direction. The lower guide member has a lower inclined surface inclined in a V-shape that protrudes downward along the other horizontal direction. And the movable element is fixed to the main body and the main body. A plurality of upper sliding members slidable along the upper inclined surface, a plurality of lower sliding members fixed to the main body portion and slidable along the lower inclined surface, A plurality of upper rolling members fixed to be rotatable about another horizontal extending axis and capable of rolling along the upper inclined surface, and rotatable about the one horizontal extending axis on the main body. A plurality of lower rolling members fixed to the lower inclined surface and capable of rolling along the lower inclined surface, wherein the plurality of upper rolling members include an upper gradient at which the gradient of the upper inclined surface is switched in an initial state. A first upper rolling member in contact with the switching portion; and the upper slope of the upper inclined surface in an initial state, disposed on one side and lower side of the one horizontal direction than the first upper rolling member. One of the one horizontal direction than the switching part A second upper rolling member that is in contact with the first upper rolling member, and the upper gradient switching portion of the upper inclined surface in the initial state. A third upper rolling member in contact with the other horizontal side of the first horizontal direction, and the plurality of upper sliding members include the first upper rolling member and the second upper rolling member. A first upper sliding member disposed between the movable member and in surface contact with one side in the one horizontal direction with respect to the upper gradient switching portion of the upper inclined surface in the initial state; and the first upper portion The second member disposed between the rolling member and the third upper rolling member and in surface contact with the other side in the one horizontal direction with respect to the upper gradient switching portion of the upper inclined surface in the initial state. And an upper sliding member. The number of lower rolling members includes a first lower rolling member that is in contact with a lower slope switching portion in which the slope of the lower inclined surface is switched in an initial state, and the other lower rolling members than the first lower rolling member. A second lower rolling member disposed on one side and on the upper side and in contact with one other side in the other horizontal direction with respect to the lower gradient switching portion of the lower inclined surface in the initial state; and the first lower rolling member A third lower rolling element that is disposed on the other horizontal side and above the member, and is in contact with the other horizontal direction other side than the lower gradient switching portion of the lower inclined surface in the initial state. And the plurality of lower sliding members are disposed between the first lower rolling member and the second lower rolling member, and in the initial state, the lower inclined surface The lower slope cutting of The first lower sliding member that is in surface contact with one side in the other horizontal direction than the separated portion, and is disposed between the first lower rolling member and the third lower rolling member, and in the initial state, The second lower sliding member that is in surface contact with the other side in the other horizontal direction than the lower gradient switching portion of the lower inclined surface is included.

In the present invention, since the mover has the upper sliding member and the upper rolling member, when the portion that passes through the upper gradient switching portion and contacts the upper inclined surface changes, together with the upper sliding member The upper sliding member comes into contact with the upper inclined surface. For this reason, in the present invention, compared to a seismic isolation mechanism provided with a mover having only an upper sliding member, the upper rolling member in contact with the upper inclined surface rolls around the axis, thereby causing contact impact. It can absorb and the mover can pass smoothly through the upper gradient switching part.
Further, since the upper sliding member is disposed so as to be sandwiched between the upper rolling members and the upper rolling member is in contact with the upper inclined surface, rotation (rattle) of the upper sliding member is prevented. Thus, it is possible to prevent the upper sliding member from coming into contact with the upper inclined surface without contacting the front end portion in advance.

In addition, since the mover includes the lower sliding member and the lower rolling member, when the portion that passes through the lower gradient switching portion and contacts the lower inclined surface is changed, the movable member is partially moved together with the lower sliding member. The moving member comes into contact with the lower inclined surface. For this reason, in the present invention, compared with a seismic isolation mechanism provided with a mover having only a lower sliding member, the lower rolling member that is in contact with the lower inclined surface rolls around the axis so that the contact impact is reduced. It can absorb and the mover can pass smoothly through the lower gradient switching portion.
Further, since the lower sliding member is disposed so as to be sandwiched between the lower rolling members and the lower rolling member is in contact with the lower inclined surface, the rotation (rattle) of the lower sliding member is prevented. Thus, it is possible to prevent the lower sliding member from coming into surface contact with the lower inclined surface without contacting only the tip portion in advance.

Further, in the seismic isolation mechanism according to the present invention, each of the plurality of upper rolling members includes a damping material that attenuates an impact of contact with the upper inclined surface, and each of the plurality of lower rolling members includes It is preferable to have a damping material that attenuates the impact of contact with the lower inclined surface.
By setting it as such a structure, since an upper rolling member can absorb the impact of a contact with an upper inclined surface, a needle | mover can pass the upper gradient switching part smoothly.
Moreover, since the lower rolling member can absorb the impact of the contact with the lower inclined surface, the mover can smoothly pass through the lower gradient switching portion.

In the seismic isolation mechanism according to the present invention, the plurality of upper sliding members are formed in a plate shape, one plate surface is in surface contact with the upper inclined surface, and the other plate surface side is fixed to the main body portion. The edge portions on the one plate surface side and the one horizontal side are chamfered, and the plurality of lower sliding members are formed in a plate shape, and one plate surface is the lower portion. It is preferable that the inclined plate is in surface contact, the other plate surface side is fixed to the main body, and the one plate surface side and the other horizontal side edges are chamfered.
By adopting such a configuration, the upper sliding member is restrained from being caught on the upper inclined surface when moving along the upper inclined surface, so that the movable element and the upper guide member are smoothly displaced relative to each other. Can do.
Further, since the lower sliding member is restrained from being caught on the lower inclined surface when moving along the lower inclined surface, the movable element and the lower guide member can be smoothly displaced relative to each other.

  According to the present invention, the mover can smoothly pass through the upper gradient switching portion of the upper inclined surface and the lower gradient switching portion of the lower inclined surface.

It is the schematic diagram which shows an example which looked at the seismic isolation mechanism by embodiment of this invention from the X direction . It is the model which shows an example which looked at the seismic isolation mechanism by embodiment of this invention from the Y direction . It is a disassembled perspective view which shows an example of the seismic isolation mechanism by embodiment of this invention. It is a top view of the seismic isolation mechanism by embodiment of this invention. It is the perspective view which looked at the needle | mover from the upper side. It is the perspective view which looked at the needle | mover from the lower side. It is sectional drawing orthogonal to the axis line of an upper rolling member and a lower rolling member. It is sectional drawing by the vertical surface along the sliding direction of an upper sliding member and a lower sliding member. It is a figure explaining a mode that the lower guide member and the needle | mover were displaced relatively. It is a figure explaining the other mode that the lower guide member and the needle | mover moved relatively. It is a figure explaining a mode that the upper guide member and the needle | mover were displaced relatively. It is a figure explaining the other mode that the upper guide member and the needle | mover moved relatively. (A) is a figure explaining the seismic isolation mechanism and dead weight of an initial state, (b) is a figure explaining the seismic isolation mechanism and restoring force which the upper guide member and the needle | mover relatively displaced. It is a figure explaining a restoring force characteristic (load-deformation relationship). (A) is the schematic diagram which shows an example which looked at the seismic isolation mechanism by the modification of embodiment of this invention from the Y direction, (b) looked at the seismic isolation mechanism by the modification of embodiment of this invention from the X direction. It is a schematic diagram which shows an example. (A) is a schematic diagram which shows an example which looked at the seismic isolation mechanism by the other modification of embodiment of this invention from the Y direction, (b) is X about the seismic isolation mechanism by other modification of embodiment of this invention. It is a schematic diagram which shows an example seen from the direction.

Hereinafter, a seismic isolation mechanism according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the seismic isolation mechanism 1 according to the present embodiment is provided in the seismic isolation layer 13 between the upper structure 11 and the lower structure 12. The lower structure 12 is supported by the ground. The upper structure 11 and the lower structure 12 are configured to be relatively displaceable in the horizontal direction. It is assumed that the seismic isolation layer 13 is provided with a plurality of seismic isolation mechanisms 1.
The seismic isolation mechanism 1 includes an upper guide member 2 fixed to the bottom of the upper structure 11, a lower guide member 3 disposed below the upper guide member 2 and fixed to the upper portion of the lower structure 12, and an upper guide. And a movable element 4 interposed between the member 2 and the lower guide member 3.
The upper guide member 2 and the lower guide member 3 are configured to be relatively displaceable in the horizontal direction, and the relative displacement in the vertical direction is determined by the relative displacement in the horizontal direction.

As shown in FIGS. 1 to 3, the upper guide member 2 is formed of a long block-like member, and is arranged in a direction in which the longitudinal direction is one horizontal direction (X direction). In the present embodiment, the upper guide member 2 is fixed to the upper structure 11 (see FIGS. 1 and 2) via a flat fixed plate portion 22.
As shown in FIG. 2, the lower surface of the upper guide member 2 is formed in a substantially inverted V-shaped inclined surface with a substantially central portion in the X direction protruding upward along the X direction. The lower surface of the upper guide member 2 is the upper inclined surface 21, the bent portion of the substantially central portion of the upper inclined surface 21 is the upper bent portion 21 a, and the upper bent portion 21 a including the upper bent portion 21 a of the upper inclined surface 21. The vicinity of both sides in the X direction is an upper gradient switching portion 21b.
The upper inclined surface 21 is formed in a planar shape on both sides of the upper bent portion 21a. One side and the other side in the X direction of the upper bent portion 21a of the upper inclined surface 21 are formed at the same inclination angle θ.
Each upper inclined surface 21 is provided with a sliding material such as Teflon (registered trademark).

As shown in FIGS. 1 to 3, the lower guide member 3 is formed of a block-like member having substantially the same length as the upper guide member 2, and the other horizontal direction (Y It is arranged in the direction that becomes the direction. In the present embodiment, the lower guide member 3 is fixed to the lower structure 12 (see FIGS. 1 and 2) via a flat fixed plate portion 32.
As shown in FIGS. 1 and 3, the upper surface of the lower guide member 3 is formed in a substantially V-shaped inclined surface in which a substantially central portion in the Y direction protrudes downward along the Y direction. The upper surface of the lower guide member 3 is a lower inclined surface 31, a bent portion at a substantially central portion of the lower inclined surface 31 is a lower bent portion 31 a, and a lower bent portion 31 a including the lower bent portion 31 a of the lower inclined surface 31. The vicinity of both sides in the Y direction is a lower gradient switching portion 31b.
The lower inclined surface 31 is formed in a planar shape on both sides of the lower bent portion 31a. One side and the other side in the Y direction of the lower bent portion 31a of the lower inclined surface 31 are formed at the same inclination angle θ.
Each lower inclined surface 31 is provided with a sliding material such as Teflon (registered trademark).

  The upper guide member 2 and the lower guide member 3 are arranged so as to overlap each other with a gap in the vertical direction. As shown in FIG. 4, the mover 4 is disposed at an intersection 5 between the upper guide member 2 and the lower guide member 3 where the upper guide member 2 and the lower guide member 3 overlap in the vertical direction.

  As shown in FIGS. 1 to 3, 5, and 6, the mover 4 includes a main body 41 and a plurality of (three in the present embodiment) upper rolling members 42 provided on the upper portion of the main body 41. , 42, 42, a plurality of (three in this embodiment) lower rolling members 43, 43, 43 provided in the lower portion of the main body 41, and a plurality of upper slides fixed to the upper portion of the main body 41 Members (two in this embodiment) 44, 44 and a plurality (two in this embodiment) of lower sliding members 45, 45 fixed to the upper portion of the main body 41.

The main body 41 has a base 411 formed in a substantially rectangular parallelepiped shape, a pair of upper projecting plate portions 412 and 412 (see FIGS. 1 and 3) projecting upward from the base 411, and projecting downward from the base 411. And a pair of lower protruding plate portions 413 and 413 (see FIGS. 2 and 3).
The base 411 is arranged such that the upper surface and the lower surface are each directed in the vertical direction, the pair of opposed side surfaces are directed in the X direction, and the other pair of opposed side surfaces are directed in the Y direction.

The pair of upper protruding plate portions 412 and 412 protrude upward from both ends of the base portion 411 in the Y direction, and each plate surface is formed in a flat plate shape facing the Y direction. Three upper rolling members 42, 42, 42 are arranged between the pair of upper protruding plate portions 412, 412.
Sliding materials 414 and 414 (see FIGS. 1 and 5) such as Teflon (registered trademark) are provided in the vicinity of the upper end portions of the surfaces of the pair of upper protruding plate portions 412 and 412 facing each other.
When the upper end portion of each of the pair of upper protruding plate portions 412 and 412 protrudes above the three upper rolling members 42, 42 and 42, and the movable element 4 is disposed below the upper guide member 2, The upper guide member 2 is disposed on the side of the upper guide member 2 so as to sandwich the upper guide member 2 from both sides in the Y direction, and the sliding members 414 and 414 provided on the upper guide member 2 are configured to contact the side surfaces of the upper guide member 2. Yes.

The pair of lower protruding plate portions 413 and 413 protrudes downward from both ends of the base portion 411 in the X direction, and each plate surface is formed in a flat plate shape facing the X direction. Three lower rolling members 43, 43, 43 are disposed between the pair of lower protruding plate portions 413, 413.
Sliding materials 415 and 415 (see FIGS. 2 and 6) such as Teflon (registered trademark) are provided in the vicinity of the lower end portions of the opposing surfaces of the pair of lower protruding plate portions 413 and 413, respectively.
When the vicinity of the lower end of each of the pair of lower protruding plate portions 413 and 413 protrudes below the three lower rolling members 43, 43 and 43, and the movable element 4 is disposed above the lower guide member 3, The lower guide member 3 is disposed on the side of the lower guide member 3 so as to sandwich the lower guide member 3 from both sides in the X direction, and the sliding materials 415 and 415 provided on the lower guide member 3 are configured to contact the side surfaces of the lower guide member 3. Yes.

As shown in FIGS. 2 and 5, the three upper rolling members 42, 42, 42 are each composed of substantially the same substantially cylindrical roller, and each has a pair of upper projecting plate portions whose axes extend in the Y direction. 412 and 412. The three upper rolling members 42, 42, 42 are supported by the pair of upper protruding plate portions 412, 412 so as to be rotatable around the axis.
As shown in FIG. 7, the three upper rolling members 42, 42, 42 are each composed of a pipe body 421 such as a pipe disposed on the outer peripheral part, a shaft part 422 inserted into the pipe body 421, and a shaft And a damping material 423 filled between the portion 422 and the inner peripheral surface of the tube body 421. As the damping material 423, a viscoelastic body or the like is employed.
Returning to FIGS. 2 and 5, the three upper rolling members 42, 42, 42 are arranged in the X direction, and the first of the three upper rolling members 42, 42, 42 is the center of the arrangement. The first upper rolling member 42A is disposed on the other side in the X direction than the first upper rolling member 42A and the second upper rolling member 42B disposed on the one side in the X direction from the first upper rolling member 42A. It is arranged above the third upper rolling member 42C.

As shown in FIGS. 1 and 6, the three lower rolling members 43, 43, 43 are each configured by substantially the same substantially cylindrical roller, and each has a pair of lower projecting plate portions with an axis extending in the X direction. 413 and 413. The three lower rolling members 43, 43, 43 are supported by the pair of lower projecting plate portions 413, 413, respectively, so as to be rotatable about the axis.
As shown in FIG. 7, the three lower rolling members 43, 43, 43 are each composed of a pipe body 431 such as a pipe disposed on the outer periphery, a shaft part 432 inserted into the pipe body 431, and a shaft And a damping material 434 filled between the portion 432 and the inner peripheral surface of the tube body 431. As the damping material 433, a viscoelastic body or the like is employed.
Returning to FIG. 1 and FIG. 6, the three lower rolling members 43, 43, 43 are arranged in the Y direction, and the first of the three lower rolling members 43, 43, 43 is the center of the arrangement. The first lower rolling member 43A is disposed on the other side in the Y direction with respect to the second lower rolling member 43B and the first lower rolling member 43A disposed on the one side in the Y direction with respect to the first lower rolling member 43A. It is arranged below the third lower rolling member 43C.

As shown in FIGS. 2 and 5, the two upper sliding members 44, 44 are each formed in a substantially plate shape, one plate surface faces the upper inclined surface 21, and the other plate surface side is the main body. It is fixed to the part 41.
The two upper sliding members 44, 44 are arranged in the X direction, and the first upper sliding member 44A on one side in the X direction includes a first upper rolling member 42A and a second upper rolling member 42B. The second upper sliding member 44B on the other side in the X direction is disposed between the first upper rolling member 42A and the third upper rolling member 42C.

44 A of 1st upper sliding members are formed in the inclined surface which gradually goes up one side toward the other side from the one side of a X direction, and the 1st upper sliding member 44A is X direction rather than the upper bending part 21a of the upper inclined surface 21. It is configured to be able to come into surface contact with one side.
The second upper sliding member 44B is formed such that one surface is gradually inclined downward from one side in the X direction toward the other side, and is more in the X direction than the upper bent portion 21a of the upper inclined surface 21. It is comprised so that surface contact with the other side of this is possible.
As shown in FIG. 8, the upper sliding members 44 and 44 are formed in an R shape by chamfering end portions 44 a and 44 a on both sides in the X direction on one surface side.

As shown in FIGS. 1 and 6, the two lower sliding members 45, 45 are each formed in a substantially plate shape, one plate surface faces the lower inclined surface 31, and the other plate surface side is the main body. It is fixed to the part 41.
The two lower sliding members 45, 45 are arranged in the Y direction, and the first lower sliding member 45A on one side in the Y direction includes the first lower rolling member 43A and the second lower rolling member 43B. The second lower sliding member 45B on the other side in the Y direction is disposed between the first lower rolling member 43A and the third lower rolling member 43C.

45 A of 1st lower sliding members are formed in the inclined surface where one surface gradually goes to the lower side toward the other side from the one side of a Y direction, and is Y direction rather than the lower bending part 31a of the lower inclined surface 31 It is comprised so that a surface contact can be carried out with one side.
The second lower sliding member 45B is formed such that one surface is gradually inclined upward from one side in the Y direction toward the other side, and is more in the Y direction than the lower bent portion 31a of the lower inclined surface 31. It is comprised so that surface contact with the other side is possible.
As shown in FIG. 8, the lower sliding members 45, 45 are formed in an R shape by chamfering the end portions 45a, 45a on both sides in the Y direction on one surface side.

As shown in FIGS. 1, 2, and 4, such a seismic isolation mechanism 1 has an X-direction center portion of the upper guide member 2 and a Y-direction center portion of the lower guide member 3 in the initial state. A movable element 4 is arranged between the central portion in the X direction of the upper guide member 2 and the central portion in the Y direction of the lower guide member 3 in the vertical direction.
The first to third upper rolling members 42 </ b> A to 42 </ b> C are in contact with the upper inclined surface 21, and the first upper rolling member 42 </ b> A is disposed below the upper bent portion 21 a of the upper inclined surface 21. .
The first to third lower rolling members 43 </ b> A to 43 </ b> C are in contact with the lower inclined surface 31, and the first lower rolling member 43 </ b> A is disposed above the lower bent portion 31 a of the lower inclined surface 31.

Further, the first upper sliding member 44A and the second upper sliding member 44B are in contact with the upper inclined surface 21, respectively, and the first upper sliding member 44A is more X than the upper bent portion 21a of the upper inclined surface 21. The second upper sliding member 44B is in contact with the portion on the other side in the X direction with respect to the upper bent portion 21a of the upper inclined surface 21.
The first lower sliding member 45A and the second lower sliding member 45B are in contact with the lower inclined surface 31, respectively, and the first lower sliding member 45A is more in the Y direction than the lower bent portion 31a of the lower inclined surface 31. The second lower sliding member 45B is in contact with the other side portion in the Y direction with respect to the lower bent portion 31a of the lower inclined surface 31.
The first to third upper rolling members 42A to 42C, the first to third lower rolling members 43A to 43C, the first to second upper sliding members 44A and 44B, and the first to second lower sliding members. The members 45A and 45B bear the load of the upper structure at the respective rigidity ratios.

Next, the behavior of the seismic isolation mechanism 1 will be described.
As shown in FIGS. 9 to 12, when an earthquake occurs and the upper structure 11 and the lower structure 12 are relatively displaced in the horizontal direction, the upper guide member 2 and the lower guide member 3 are relatively displaced in the horizontal direction. The intersection 5 moves with respect to the upper guide member 2 and the lower guide member 3.
The mover 4 is always arranged at the intersection 5 between the upper guide member 2 and the lower guide member 3. Therefore, when the movable element 4 and the lower guide member 3 are relatively displaced in the Y direction from the initial state shown in FIGS. 1 and 2, as shown in FIGS. 9 and 10, the movable relative to the lower guide member 3 is movable. The position of the child 4 becomes higher than the initial state, and potential energy (potential energy) is accumulated. Also, as shown in FIGS. 11 and 12 from the initial state, when the mover 4 and the upper guide member 2 are relatively displaced in the X direction, the position of the upper guide member 2 relative to the mover 4 is more than the initial state. The position becomes high and potential energy (potential energy) is accumulated.

  As shown in FIG. 1, in the initial state, the three lower rolling members 43, 43, 43 of the mover 4 come into contact with the lower inclined surface 31, respectively, and the three upper rolling members 42, 42, 42 are The two lower sliding members 45, 45 are in contact with the lower inclined surface 31, respectively, and the two upper sliding members 44, 44 are in contact with the upper inclined surface 21, respectively.

As shown in FIG. 9, when the mover 4 and the lower guide member 3 are relatively displaced so that the mover 4 moves to one side in the Y direction with respect to the lower guide member 3, the first lower rolling member 43 </ b> A, The second lower rolling member 43B and the first lower sliding member 45A are in contact with the lower inclined surface 31, and the third lower rolling member 43C and the second lower sliding member 45B are separated from the lower inclined surface 31.
As shown in FIG. 10, when the mover 4 and the lower guide member 3 are relatively displaced so that the mover 4 moves to the other side in the Y direction with respect to the lower guide member 3, the first lower rolling member 43A, the first The third lower rolling member 43C and the second lower sliding member 45B are in contact with the lower inclined surface 31, and the second lower rolling member 43B and the first lower sliding member 45A are separated from the lower inclined surface 31.

As shown in FIG. 11, when the mover 4 and the upper guide member 2 are relatively displaced so that the mover 4 moves to one side in the X direction with respect to the upper guide member 2, the first upper rolling member 42A, the first The second upper rolling member 42B and the first upper sliding member 44A are in contact with the upper inclined surface 21, and the third upper rolling member 42C and the second upper sliding member 44B are separated from the upper inclined surface 21.
As shown in FIG. 12, when the mover 4 and the upper guide member 2 are relatively displaced so that the mover 4 moves to the other side in the X direction with respect to the upper guide member 2, the first upper rolling member 42A, the first The third upper rolling member 42C and the second upper sliding member 44B are in contact with the upper inclined surface 21, and the second upper rolling member 42B and the first upper sliding member 44A are separated from the upper inclined surface 21.

  As shown in FIG. 13, when the axial force (self-weight) supported by the seismic isolation mechanism 1 is W and the friction coefficient μ of the sliding member, the restoring force (horizontal force) F due to the inclination of the lower inclined surface 31 is inclined with respect to the horizontal plane. The angle θ is expressed by the following formula (1). The restoring force due to the inclination of the upper inclined surface 21 is similarly expressed.

  This is the same as the case where a constant load spring having a pre-tension force F is installed between the upper structure and the lower structure, and a constant restoring force F is obtained regardless of the relative displacement amount of the upper structure and the lower structure. Will work. If tan θ ≧ μ, the residual displacement can be completely removed, but it is described in Japanese Patent Application Laid-Open No. 2011-201873 that the residual displacement can be removed even with a value corresponding to 1/2 to 1/10. Yes. Thus, in this embodiment, it turns out that there exists the same effect, without installing a constant load spring.

FIG. 14 shows the restoring force characteristics (load-deformation relationship) of the seismic isolation mechanism 1 according to this embodiment.
Sliding friction resistance (μ ₁ W ₁ ) when the upper sliding members 44, 44 and the lower sliding members 45, 45 slide, the upper rolling members 42, 42, 42 and the lower rolling members 43, 43, 43 A combination of the rolling frictional resistance force (μ ₂ W ₂ ) and the tilt restoring force (F = Wtanθ) at the time of rolling is the restoring force characteristic of the seismic isolation mechanism 1 (tilt rolling bearing) according to this embodiment. . W ₁ and W ₂ are their own weights which are borne by the upper sliding members 44, 44 and the lower sliding members 45, 45, the upper rolling members 42, 42, 42 and the lower rolling members 43, 43, 43, respectively.

Next, the operation and effect of the above-described seismic isolation mechanism will be described with reference to the drawings.
In the seismic isolation mechanism 1 according to this embodiment described above, the mover 4 includes the upper sliding members 44 and 44 and the upper rolling member 42, thereby passing through the upper gradient switching portion 21 b and the upper inclined surface. when the change is 21 and abuts portions, so that together with the upper sliding member 44, 44 the upper rolling member 42,42,42 in contact with the upper inclined surface 21. Therefore, in the present invention, the upper rolling members 42, 42, 42 that are in contact with the upper inclined surface 21 are rotated around the axis as compared with the seismic isolation mechanism provided with the mover 4 having only the upper sliding members 44, 44. , The impact of the contact can be absorbed, and the mover 4 can smoothly pass through the upper gradient switching portion 21b.

  Further, since the mover 4 includes the lower sliding members 45 and 45 and the lower rolling members 43, 43, and 43, a portion that passes through the lower gradient switching portion 31 b and contacts the lower inclined surface 31 is provided. When changing, the part rolling member comes into contact with the lower inclined surface 31 together with the lower sliding members 45, 45. For this reason, in the present invention, the lower rolling members 43, 43, 43 in contact with the lower inclined surface 31 are rotated around the axis as compared with the seismic isolation mechanism provided with the mover 4 having only the lower sliding members 45, 45. , The impact of the contact can be absorbed, and the mover 4 can smoothly pass through the lower gradient switching portion 31b.

  In the present embodiment, the upper rolling members 42, 42, 42 each have a damping material 423 that attenuates an impact with the upper inclined surface 21, and the lower rolling members 43, 43, 43 are lower inclined surfaces. A damping material 433 for attenuating the impact with 31 is provided. Thereby, since the damping material 423 of the upper rolling members 42, 42, 42 can absorb the impact when the upper rolling members 42, 42, 42 come into contact with the upper inclined surface 21, the mover 4 is While being able to pass smoothly through the upper gradient switching portion 21b, the damping material 433 of the lower rolling members 43, 43, 43 impacts when the lower rolling members 43, 43, 43 contact the lower inclined surface 31. Therefore, the mover 4 can smoothly pass through the lower gradient switching portion 31b.

  In the present embodiment, the upper sliding members 44, 44 are chamfered on one plate surface side and on both sides in the X direction, and the lower sliding members 45, 45 are on one plate surface side. The edges on both sides in the Y direction are chamfered. As a result, the upper sliding members 44, 44 are restrained from being caught on the upper inclined surface 21 when moving along the upper inclined surface 21, so that the movable element 4 and the upper guide member 2 are smoothly displaced relative to each other. In addition, since the lower sliding members 45, 45 are restrained from being caught on the lower inclined surface 31 when moving along the lower inclined surface 31, the movable element 4 and the lower guide member 3 can be smoothly moved relative to each other. Can be displaced.

In this embodiment, the seismic isolation mechanism 1 includes sliding members (upper sliding members 44, 44 and lower sliding members 45, 45) and rolling members (upper rolling members 42, 42, 42 and lower rolling member 43). , 43, 43), and at the time of movement, sliding by the sliding member and rolling by the rolling member are simultaneously performed.
Generally, the frictional resistance between the rolling member and the inclined surfaces (the upper inclined surface 21 and the lower inclined surface 31) is orders of magnitude smaller than the frictional resistance between the sliding member and the inclined surface. Compared with the conventional seismic isolation mechanism using the, the frictional resistance (μ _eq ) with the inclined surface of the entire seismic isolation mechanism can be reduced. The frictional resistance (μ _eq ) with the inclined surface of the entire seismic isolation mechanism is expressed by the following equation (2).

For example, the sliding friction coefficient μ ₁ = 0.1 in the sliding seismic isolation mechanism, the rolling friction coefficient μ ₂ = 0.01 in the rolling seismic isolation mechanism, and the axial force burden of the sliding member is W ₁ = 0.5 W, Assuming that the axial force load of the rolling member is W ₂ = 0.5 W, the frictional resistance μ _eq = 0.05 <0.1 with the inclined surface of the entire seismic isolation mechanism effectively suppresses the response acceleration. it can. Moreover, a predetermined frictional resistance (μ _eq ) can be obtained by adjusting the area of the surface in contact with the inclined surface of the sliding member, the number of rolling members, the outer diameter of the tubular body, and the like.

Moreover, since the seismic isolation mechanism according to the present embodiment uses the sliding member and the rolling member in combination, the load resistance can be increased as compared with the seismic isolation mechanism using only the rolling member.
In addition, since the number of seismic isolation mechanisms to be installed can be reduced compared to the case where a seismic isolation mechanism using only sliding members and a seismic isolation mechanism using only rolling members are used in combination, Costs and time related to the manufacture and construction of the mechanism can be reduced.

As mentioned above, although embodiment of the seismic isolation mechanism by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the above embodiment, the mover 4 is provided with the first to third upper rolling members 42A to 42C and the first to third lower rolling members 43A to 43C one by one. It may be provided one by one.
In the above embodiment, the upper rolling member 42 and the lower rolling member 43 are rollers, but they may be bearings instead of the rollers.

15, the upper rolling members 46A, 46A,... Are biased upward by springs 461A, 461A,... Provided on the main body 41, and the lower rolling members 47A, 47A,. .. May be biased downward by springs 471A, 471A.
In this way, the springs 461A, 461A,... Can absorb the impact when the upper rolling members 46A, 46A, etc. contact the upper inclined surface 21, and the mover 4 is located above the upper inclined surface 21. The gradient switching part 21b can be smoothly passed. Further, the springs 471A, 471A,... Can absorb the impact when the lower rolling members 47A, 47A, etc. contact the lower inclined surface 31, and the mover 4 moves the lower gradient switching portion 31b of the lower inclined surface 31. It can pass smoothly.

  In the seismic isolation mechanism 1A shown in FIG. 15, the springs 461A and 471A are supported by the main body 41 in a state of being arranged inside the main body 41, but as in the seismic isolation mechanism 1B shown in FIG. The springs 461B, 461B ... energizing the upper rolling members 46B, 46B ... and the springs 471B, 471B ... energizing the lower rolling members 47B, 47B ... The portion 41 may be supported.

In the above embodiment, the upper rolling member 42 and the lower rolling member 43 have the damping materials 423 and 433, but may not have the damping materials 423 and 433.
In the above embodiment, the upper sliding member 44 and the lower sliding member 45 are chamfered at the edge, but may not be chamfered.

1, 1A, 1B Seismic isolation mechanism 2 Upper guide member 3 Lower guide member 4 Movable element 5 Intersection 11 Upper structure 12 Lower structure 13 Seismic isolation layer 21 Upper inclined surface 21a Upper bent portion 21b Upper gradient switching portion 31 Lower slope Surface 31a Lower bent portion 31b Lower gradient switching portion 41 Body portion 42, 46A, 46B Upper rolling member 42A First upper rolling member 42B Second upper rolling member 42C Third upper rolling member 43, 47A, 47B Lower rolling Moving member 43A First lower rolling member 43B Second lower rolling member 43C Third lower rolling member 44 Upper sliding member 44A First upper sliding member 44B Second upper sliding member 45 Lower sliding member 45A First Lower sliding member 45B Second lower sliding member 423,433 Damping material

Claims (3)

In the seismic isolation mechanism provided between the upper structure and the lower structure that can be relatively displaced in the horizontal direction,
An upper guide member fixed to the bottom of the upper structure;
A lower guide member fixed to an upper portion of the lower structure;
Another horizontal member that is interposed between the upper guide member and the lower guide member and is relatively displaceable in one horizontal direction with the upper guide member and that is orthogonal to the lower guide member and the one horizontal direction. A mover capable of relative displacement in the direction,
The upper guide member has an upper inclined surface that is inclined in an inverted V shape that protrudes upward along the one horizontal direction,
The lower guide member has a lower inclined surface that is inclined in a V-shape that protrudes downward along the other horizontal direction,
The mover includes a main body part,
A plurality of upper sliding members fixed to the main body and slidable along the upper inclined surface;
A plurality of lower sliding members fixed to the main body and slidable along the lower inclined surface;
A plurality of upper rolling members fixed to the main body portion so as to be rotatable about the other axis extending in the horizontal direction and capable of rolling along the upper inclined surface;
A plurality of lower rolling members fixed to the main body portion so as to be rotatable around an axis extending in the one horizontal direction and capable of rolling along the lower inclined surface;
The plurality of upper rolling members include a first upper rolling member in contact with an upper gradient switching portion where the gradient of the upper inclined surface is switched in an initial state;
The first upper rolling member is disposed on one side and below the one horizontal direction, and in the initial state, on one side in the one horizontal direction with respect to the upper gradient switching portion of the upper inclined surface. A second upper rolling member that abuts,
The first upper rolling member is disposed on the other side and below the one horizontal direction, and in the initial state, the other side in the one horizontal direction with respect to the upper gradient switching portion of the upper inclined surface. A third upper rolling member that abuts,
The plurality of upper sliding members are disposed between the first upper rolling member and the second upper rolling member, and in an initial state, the upper slope switching portion of the upper inclined surface is more than the upper slope switching portion. A first upper sliding member in surface contact with one horizontal side;
It is arranged between the first upper rolling member and the third upper rolling member, and is in surface contact with the other side in the one horizontal direction with respect to the upper gradient switching portion of the upper inclined surface in the initial state. A second upper sliding member that includes:
The plurality of lower rolling members include a first lower rolling member in contact with a lower gradient switching portion where the gradient of the lower inclined surface is switched in an initial state,
The first lower rolling member is disposed on one side and on the upper side in the other horizontal direction , and in an initial state, the first lower rolling member is in contact with one side in the other horizontal direction with respect to the lower slope switching portion of the lower inclined surface. A second lower rolling member in contact,
It is disposed on the other side in the other horizontal direction and above the first lower rolling member, and in the initial state, it contacts the other side in the other horizontal direction with respect to the lower gradient switching portion of the lower inclined surface. A third lower rolling member in contact therewith,
The plurality of lower sliding members are disposed between the first lower rolling member and the second lower rolling member, and in an initial state, the lower slope switching portion of the lower inclined surface than the lower slope switching portion. A first lower sliding member that is in surface contact with the other horizontal side;
It is arranged between the first lower rolling member and the third lower rolling member, and is in surface contact with the other horizontal direction other side than the lower gradient switching portion of the lower inclined surface in the initial state. And a second lower sliding member. The plurality of upper rolling members each have a damping material that attenuates the impact of contact with the upper inclined surface,
2. The seismic isolation mechanism according to claim 1, wherein each of the plurality of lower rolling members includes an attenuation material that attenuates an impact caused by contact with the lower inclined surface. The plurality of upper sliding members are formed in a plate shape, one plate surface is in surface contact with the upper inclined surface, the other plate surface side is fixed to the main body, and the one plate surface side and The edges on both sides in the one horizontal direction are chamfered,
The plurality of lower sliding members are formed in a plate shape, one plate surface is in surface contact with the lower inclined surface, the other plate surface side is fixed to the main body portion, the one plate surface side and The seismic isolation mechanism according to claim 1 or 2, wherein the edges on both sides in the other horizontal direction are chamfered.

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