JP6796817B2 - Seismic isolation mechanism - Google Patents

Description

The present invention relates to a seismic isolation mechanism for supporting a seismic isolation object such as a building or precision equipment.

Conventionally, a seismic isolation mechanism for preventing (deterring) earthquake damage to buildings and precision equipment has been known. For example, in Patent Document 1, a mover serving as a slider between an upper guide member fixed to the bottom of a superstructure to be seismically isolated and a lower guide member fixed to the upper part of the lower structure. The seismic isolation mechanism is disclosed. In this seismic isolation mechanism, the sliding surface between the mover and the upper guide member is formed as 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 formed. It is formed on an inclined surface that is V-shaped along the other horizontal direction orthogonal to one horizontal direction.
By moving the mover along the inclined surface, it is possible to reduce the acceleration, dampen the vibration, and recover the displacement when an earthquake occurs.

Japanese Unexamined Patent Publication No. 2013-130216

However, if the response displacement due to an earthquake exceeds the assumption, the mover may move significantly with respect to the upper guide member and the lower guide member, and the mover may come off from the upper guide member and the lower guide member. In addition, the mover may come off from the upper guide member and the lower guide member due to an external force from one direction due to a long-term wind or the like.
On the other hand, it is conceivable to lengthen the upper guide member and the lower guide member in the direction of relative displacement with the mover, but there is a problem that the seismic isolation mechanism becomes large and the installation space increases.
Further, when a stopper is provided so that the mover does not move beyond a predetermined range when the mover moves significantly with respect to the upper guide member or the lower guide member, the acceleration when the mover collides with the stopper is the upper guide member. There is a risk that it will be transmitted to the superstructure via.

Therefore, the present invention provides a seismic isolation mechanism capable of preventing the mover from coming off the upper guide member and the lower guide member when an excessive external force is applied, and reducing the acceleration transmitted to the upper structure. The purpose is to provide.

In order to achieve the above object, the seismic isolation mechanism according to the present invention is provided at the bottom of the superstructure in the seismic isolation mechanism provided between the upper structure and the lower structure which can be relatively displaced in the horizontal direction. , An upper guide member having an inverted V-shaped inclined upper inclined surface that is convex upward along one horizontal direction, and an upper guide member provided on the upper part of the lower structure and orthogonal to the one horizontal direction. A lower guide member having a V-shaped inclined lower surface that is convex downward along the horizontal direction of the above, and the upper guide member and the lower guide member are arranged on the upper inclined surface. Along with the upper guide member and the one horizontally displaceable, the lower guide member and the other horizontally displaceable mover along the lower inclined surface, and the upper guide member. A pair of upper stoppers supported by the mover and arranged at both ends of the orbit with respect to the upper guide member in the horizontal direction, and a pair of upper stoppers arranged between the pair of upper stoppers and the mover, respectively. An upper cushioning material, a pair of lower stoppers supported by the lower guide member and arranged at both ends of the track of the mover with respect to the lower guide member in the other horizontal direction, and the pair of lower stoppers and the mover. possess a pair of lower cushioning material disposed respectively between the said upper cushioning member is formed by at least one elastic body and a viscoelastic body, a whole between the movable element and the upper stopper The lower cushioning material is formed of at least one of an elastic body and a viscoelastic body, and is a thin film arranged entirely between the lower stopper and the mover. It has a shaped sheet member, and the upper cushioning material and the lower cushioning material are not connected to the mover .

In the present invention, by having a pair of upper stoppers and a pair of lower stoppers, it is possible to prevent the mover from coming off from the upper guide member and the lower guide member when an excessive external force acts on the seismic isolation mechanism.
Since the upper cushioning material is provided between the upper stopper and the mover, the mover that has moved along the upper inclined surface toward the upper stopper becomes the upper stopper after coming into contact with the upper cushioning material. collide. As a result, the speed at which the upper cushioning material moves toward the upper stopper of the mover can be reduced as compared with the case where the mover directly collides with the upper stopper, and the impact transmitted from the mover to the upper stopper can be reduced. Can be done. As a result, when the mover collides with the upper stopper, the acceleration transmitted to the upper structure via the upper guide member can be reduced.
Similarly, since the lower cushioning material is provided between the lower stopper and the mover, the mover that has moved along the lower inclined surface toward the lower stopper will come into contact with the lower cushioning material and then the lower stopper. Collide with. As a result, the speed at which the lower cushioning material moves toward the lower stopper of the mover can be reduced as compared with the case where the mover directly collides with the lower stopper, and the impact transmitted from the mover to the lower stopper can be reduced. Can be done. As a result, the acceleration transmitted to the upper structure by the reaction force when the mover collides with the lower stopper can be reduced.
Further, in order to prevent the mover from coming off from the upper guide member and the lower guide member, it is not necessary to lengthen the upper guide member and the lower guide member in the direction of relative displacement with the mover, so that the installation space of the seismic isolation mechanism is increased. It can be made smaller.

Further, in the seismic isolation mechanism according to the present invention, the upper cushioning material is formed of at least one of an elastic body and a viscoelastic body, and is a thin film formed in the entire space between the upper stopper and the mover. The lower cushioning material has a sheet member, and the lower cushioning material is formed of at least one of an elastic body and a viscoelastic body, and has a thin film-like seat member arranged entirely between the lower stopper and the mover. It is said.
With such a configuration, when the mover and the upper guide member move relative to each other so that the mover faces the upper stopper, the seat member between the mover and the upper stopper is compressed, and the upper stopper of the mover is compressed. Since the speed toward is reduced, the impact transmitted from the mover to the upper stopper can be reduced. As a result, when the mover collides with the upper stopper, the acceleration transmitted to the upper structure via the upper guide member can be reduced.
Similarly, when the mover and the lower guide member move relative to each other so that the mover moves toward the lower stopper, the seat member between the mover and the lower stopper is compressed, and the speed of the mover toward the lower stopper decreases. Therefore, the impact transmitted from the mover to the lower stopper can be reduced. As a result, the acceleration transmitted to the upper structure by the reaction force when the mover collides with the lower stopper can be reduced.

Further, in the seismic isolation mechanism according to the present invention, the upper guide member is restricted from moving horizontally with the upper structure, and the lower guide member is configured to be movable relative to the lower structure in the horizontal direction. The friction coefficient between the lower guide member and the lower structure may be larger than the friction coefficient between the mover and the lower inclined surface.
With such a configuration, when the mover collides with the upper stopper and the lower stopper with an unexpected force, the lower guide member and the lower structure can be displaced relative to each other in the horizontal direction, so that the lower guide member and the lower structure can be relatively displaced in the horizontal direction. It is possible to reduce the acceleration transmitted to the superstructure by the reaction force of the impact.

According to the present invention, it is possible to prevent the mover from coming off from the upper guide member and the lower guide member when an excessive external force is applied, and it is possible to reduce the acceleration transmitted to the upper structure.

It is a schematic diagram which shows an example of the seismic isolation mechanism by 1st Embodiment of this invention seen from the X direction. It is a schematic diagram which shows an example which looked at the seismic isolation mechanism by 1st Embodiment of this invention from the Y direction. It is an exploded perspective view which shows an example of the seismic isolation mechanism by 1st Embodiment of this invention. It is a top view of the seismic isolation mechanism according to the 1st Embodiment of this invention. It is a figure which shows the state that the mover and the lower guide member moved relative to each other. It is a figure which shows the other appearance that the mover and the lower guide member moved relative to each other. It is a figure which shows the state that the mover and the upper guide member moved relative to each other. It is a figure which shows the other appearance that the mover and the upper guide member moved relative to each other. It is sectional drawing corresponding to the cross-sectional view taken along line AA of FIG. 4 of the seismic isolation mechanism according to the 2nd Embodiment of this invention. It is sectional drawing corresponding to the BB line cross section of FIG. FIG. 9 is a sectional view taken along line CC of FIG. It is a figure explaining the 2nd lower cushioning material. It is a figure explaining the disc spring. It is a figure which shows the state that the mover and the lower guide member move relative to each other so that a mover comes close to a 2nd lower stopper. FIG. 14 is a sectional view taken along line DD of FIG. FIG. 14 is a cross-sectional view taken along the line EE of FIG. (A) is a diagram showing a second lower cushioning material in a normal state, and (b) is a diagram showing a second lower cushioning material when a mover collides with a second lower stopper. (A) is a diagram showing the normal time of the upper cushioning material and the lower cushioning material in the modified example of the present embodiment, and (b) is the upper part when the mover in the modified example of the present embodiment collides with the upper stopper and the lower stopper. It is a figure which shows the cushioning material and the lower cushioning material. It is a figure explaining another modification of this embodiment. It is a figure which shows the seismic isolation mechanism which is not provided with the upper cushioning material and the lower cushioning material. It is a figure which shows the seismic isolation mechanism provided with the upper cushioning material and the lower cushioning material. It is a figure which shows the analysis model of the seismic isolation mechanism. (A) is a graph showing the displacement of the mover (mass point) in the seismic isolation mechanism without the upper cushioning material and the lower cushioning material, and (b) is the seismic isolation mechanism without the upper cushioning material and the lower cushioning material. It is a graph which shows the acceleration of a mover (mass point) in. (A) is a graph showing the displacement of the mover (mass point) in the seismic isolation mechanism provided with the upper cushioning material and the lower cushioning material, and (b) is movable in the seismic isolation mechanism provided with the upper cushioning material and the lower cushioning material. It is a graph which shows the acceleration of a child (mass point).

(First Embodiment)
Hereinafter, the seismic isolation mechanism according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8.
As shown in FIGS. 1 and 2, the seismic isolation mechanism 1A according to the first embodiment is provided in the seismic isolation layer 13 between the upper structure 11 and the lower structure 12. The substructure 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 1A.

The seismic isolation mechanism 1A includes an upper guide member 2 fixed to the bottom of the upper structure 11, a lower guide member 3 arranged below the upper guide member 2 and fixed to the upper part of the lower structure 12, and an upper guide. A mover 4 interposed between the member 2 and the lower guide member 3, a pair of upper stoppers 5, 5 (see FIG. 2) supported by the upper guide member 2, and a pair of upper stoppers 5, 5 A pair of upper cushioning materials 6 and 6 interposed between the mover 4 and a pair of lower stoppers 7 and 7 (see FIG. 1) supported by the lower guide member 3, and a pair of lower stoppers 7 and 7. It has a pair of lower cushioning materials 8 and 8 interposed between the mover 4 and the mover 4.
In the seismic isolation mechanism 1A, the upper guide member 2 and the lower guide member 3 can be relatively displaced 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 composed of a long block-shaped member, and is arranged in a direction in which the longitudinal direction is one horizontal direction (referred to as the X direction). The upper guide member 2 is fixed to the upper structure 11 (see FIGS. 1 and 2) via a flat plate-shaped upper fixing plate 22 fixed to the upper portion. The upper fixing plate 22 is formed to be larger than the upper guide member 2 so that the shape in a plan view protrudes in the X direction and another flat direction (referred to as the Y direction) orthogonal to the X direction.

As shown in FIG. 2, the lower surface of the upper guide member 2 is formed on a substantially inverted V-shaped inclined surface in which a substantially central portion in the X direction is convex upward along the X direction. The lower surface of the upper guide member 2 is referred to as the upper inclined surface 21, and the bent portion of the substantially central portion of the upper inclined surface 21 is referred to as the upper bent portion 21a. Further, of the upper inclined surfaces 21, one side of the upper bent portion 21a in the X direction is designated as the first upper inclined surface 211, and the other side in the X direction is designated as the second upper inclined surface 212.

The first upper inclined surface 211 is formed in a plane shape gradually upward from one side in the X direction toward the other side. The second upper inclined surface 212 is formed in a plane shape gradually downward from one side in the X direction toward the other side. The first upper inclined surface 211 and the second upper inclined surface 212 are formed at an inclination angle θ having the same value with respect to the horizontal plane.
When the upper guide member 2 and the mover 4 move relative to each other, the mover 4 is configured to move along the first upper inclined surface 211 or the second upper inclined surface 212. The first upper inclined surface 211 and the second upper inclined surface 212 are each provided with a sliding material such as Teflon (registered trademark) so as to reduce friction with the mover 4.

As shown in FIGS. 1 to 3, the lower guide member 3 is composed of a block-shaped member having substantially the same length as the upper guide member 2, and is arranged so that the longitudinal direction is the Y direction. The lower guide member 3 is fixed to the lower structure 12 (see FIGS. 1 and 2) via a flat plate-shaped lower fixing plate 32 fixed to the lower part. The lower fixing plate 32 is formed so that the shape in a plan view is larger than that of the lower guide member 3 in the X direction and the Y direction.

As shown in FIG. 1, the upper surface of the lower guide member 3 is formed on a substantially V-shaped inclined surface in which a substantially central portion in the Y direction is convex downward along the Y direction. The upper surface of the lower guide member 3 is referred to as a lower inclined surface 31, and a bent portion of a substantially central portion of the lower inclined surface 31 is referred to as a lower bent portion 31a. Further, among the lower inclined surfaces 31, one side of the lower bent portion 31a in the Y direction is designated as the first lower inclined surface 311 and the other side in the Y direction is designated as the second lower inclined surface 312.

The first lower inclined surface 311 is formed in a plane shape gradually downward from one side in the Y direction toward the other side. The second lower inclined surface 312 is formed in a plane shape gradually upward from one side in the Y direction toward the other side. The first lower inclined surface 311 and the second lower inclined surface 312 are formed at an inclination angle θ of the same value with respect to the horizontal plane.
When the lower guide member 3 and the mover 4 move relative to each other, the mover 4 is configured to move along the first lower inclined surface 311 or the second lower inclined surface 312. Sliding materials such as Teflon (registered trademark) are provided on the first lower inclined surface 311 and the second lower inclined surface 313 so as to reduce friction with the mover 4.

The mover 4 includes a main body 41, a pair of upper projecting plates 42, 42 projecting upward from the main body 41, and a pair of lower projecting plates 43, 43 projecting downward from the main body 41. Have.
The main body 41 has an upper contact surface 44 formed at the upper portion and a lower contact surface 45 formed at the lower portion.
The upper contact surface 44 is formed on a substantially inverted V-shaped inclined surface in which a substantially central portion in the X direction is convex upward along the X direction. The bent portion of the substantially central portion of the upper contact surface 44 in the X direction is referred to as the upper bent portion 44a.
Further, of the upper contact surface 44, one side of the upper bent portion 44a in the X direction is designated as the first upper contact surface 441, and the other side in the X direction is designated as the second upper contact surface 442.

The first upper contact surface 441 is formed in a plane shape gradually upward from one side in the X direction toward the other side. The second upper contact surface 442 is formed in a plane shape gradually downward from one side in the X direction toward the other side. The first upper contact surface 441 and the second upper contact surface 442 are formed at an inclination angle θ of the same value with respect to the horizontal plane. The inclination angle θ is set to be the same value as the inclination angle θ with respect to the horizontal plane of the first upper inclined surface 211 and the second upper inclined surface 212 of the upper guide member 2.

The first upper contact surface 441 is configured to be slidable along the first upper inclined surface 211 of the upper guide member 2, and the second upper contact surface 442 is the second upper inclined surface 212 of the upper guide member 2. It is configured to be slidable along.
The main body 41 is provided with a rolling member capable of rolling along the first upper inclined surface 211 of the upper guide member 2 instead of the first upper contact surface 441, and the second upper contact surface 41 is provided. Instead of the surface 442, a rolling member capable of rolling along the second upper inclined surface 212 of the upper guide member 2 may be provided.

The lower contact surface 45 is formed on a substantially inverted V-shaped inclined surface in which a substantially central portion in the X direction is convex upward along the Y direction. The bent portion of the substantially central portion of the lower contact surface 45 in the X direction is referred to as the lower bent portion 45a.
Further, of the lower contact surface 45, one side of the lower bent portion 45a in the Y direction is designated as the first lower contact surface 451 and the other side in the X direction is designated as the second lower contact surface 452.

The first lower contact surface 451 is formed in a plane shape gradually upward from one side in the Y direction toward the other side. The second lower contact surface 452 is formed in a plane shape gradually downward from one side in the X direction toward the other side. The first lower contact surface 451 and the second lower contact surface 452 are formed at an inclination angle θ of the same value with respect to the horizontal plane. The inclination angle θ is set to be the same value as the inclination angle θ with respect to the horizontal plane of the first lower inclined surface 311 and the second lower inclined surface 312 of the lower guide member 3.

The first lower contact surface 451 is configured to be slidable along the first lower inclined surface 311 of the lower guide member 3, and the second lower contact surface 452 is the second lower inclined surface 312 of the lower guide member 3. It is configured to be slidable along.
The main body 41 is provided with a rolling member capable of rolling along the first lower inclined surface 311 of the lower guide member 3 instead of the first lower contact surface 451 and is provided with a second lower contact surface. Instead of the surface 452, a rolling member capable of rolling along the second lower inclined surface 312 of the lower guide member 3 may be provided.

The main body 41 is formed with a first hole 411 and a second hole 412 penetrating in the X direction, and a third hole 413 and a fourth hole 414 penetrating in the Y direction.
The first hole portion 411 and the second hole portion 412 are arranged in parallel with an interval in the Y direction. The third hole portion 413 and the fourth hole portion 414 are arranged in parallel with an interval in the X direction. The first hole portion 411 and the second hole portion 412 are arranged above the third hole portion 413 and the fourth hole portion 414 at positions not intersecting with the third hole portion 413 and the fourth hole portion 414.

The pair of upper projecting plate portions 42, 42 project upward from both ends of the main body portion 41 in the Y direction, and are formed in a flat plate shape with the plate surfaces facing the Y direction. A first upper contact surface 441 and a second upper contact surface 442 are formed between the pair of upper projecting plate portions 42, 42.
Sliding materials 421 and 421 (see FIGS. 1 and 5) such as Teflon (registered trademark) are provided in the vicinity of the upper ends of the pair of upper projecting plate portions 42 and 42 facing each other.
The pair of upper projecting plate portions 42, 42 project upward from the first upper contact surface 441 and the second upper contact surface 442. When the mover 4 is arranged on the lower side of the upper guide member 2, the pair of upper projecting plate portions 42, 42 are arranged 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. The sliding members 421 and 421 provided on the respective surfaces are configured to come into contact with the side surfaces of the upper guide member 2. At this time, the upper end surfaces of the pair of upper projecting plate portions 42, 42 are set so as to be separated from the lower surface of the upper fixing plate 22 that fixes the upper guide member 2 to the upper structure 11 at a predetermined interval.

The pair of lower projecting plate portions 43, 43 project downward from both ends of the main body portion 41 in the X direction, and are formed in a flat plate shape with the plate surfaces facing the X direction. A first lower contact surface 451 and a second lower contact surface 452 are formed between the pair of lower projecting plate portions 43, 43.
Sliding materials 431 and 431 (see FIGS. 2 and 6) such as Teflon (registered trademark) are provided in the vicinity of the lower ends of the pair of lower projecting plate portions 43 and 43 facing each other.
The pair of lower projecting plate portions 43, 43 project downward from the first lower contact surface 451 and the second lower contact surface 452. When the mover 4 is arranged above the lower guide member 3, the pair of lower projecting plate portions 43, 43 are arranged 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. , Each of the sliding members 431 and 431 are configured to come into contact with the side surface of the lower guide member 3. At this time, the upper end surfaces of the pair of lower projecting plate portions 43, 43 are set so as to be separated from the lower surface of the lower fixing plate 32 that fixes the lower guide member 3 to the lower structure 12 at a predetermined interval.

Such an upper guide member 2 and a 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 arranged at the intersection 10 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.

The pair of upper stoppers 5 and 5 are plate-shaped members arranged so that their plate surfaces face the X direction, and one of the first upper stoppers 51 is the X direction of the first upper inclined surface 211 of the upper guide member 2. It is fixed to the upper guide member 2 in a state of protruding downward from one end, and the other second upper stopper 52 is below the other end of the second upper inclined surface 212 of the upper guide member 2 in the X direction. It is fixed to the upper guide member 2 in a state of projecting to the side.
The first upper stopper 51 and the second upper stopper 52 are arranged on the trajectory when the mover 4 moves relative to the upper guide member 2 in the X direction, and the mover 4 is arranged in the X direction of the upper guide member 2. It is configured to prevent it from coming off from both ends.

The pair of upper cushioning materials 6 and 6 are thin-film sheet members similarly formed on at least one of an elastic body such as a rubber sheet and a viscoelastic body having self-restoring properties, and one side in a plan view. Is a long, substantially rectangular shape longer than the other side, and is arranged so that the longitudinal direction is the X direction and the lateral direction is the Y direction.
In the pair of upper cushioning materials 6 and 6, one first upper cushioning material 61 is arranged between the mover 4 and the first upper stopper 51, and the other second upper cushioning material 62 is the mover 4 and the second. It is arranged between the upper stopper 52 and the upper stopper 52.
The first upper cushioning material 61 and the second upper cushioning material 62 are supported by the first upper wire rod 63 and the second upper wire rod 64, which are erected between the first upper cushioning material 61 and the first upper stopper 51, respectively.
In addition, in FIG. 2 and FIG. 3, the first upper cushioning material 61 and the second upper cushioning material 62 are shown in the form of a thick sheet for the sake of explanation.

The first upper wire rod 63 and the second upper wire rod 64 are wires, steel rods, or the like, which extend in the X direction and are arranged in parallel with an interval in the Y direction.
One end of the first upper wire rod 63 is fixed near the end on one side of the first upper stopper 51 in the Y direction, and the other end is fixed near the end on one side of the second upper stopper 52 in the Y direction. Has been done. The first upper wire rod 63 is inserted into the first hole portion 411 of the mover 4.
One end of the second upper wire rod 64 is fixed near the other end of the first upper stopper 51 in the Y direction, and the other end is fixed near the other end of the second upper stopper 52 in the Y direction. Has been done. The second upper wire rod 64 is inserted into the second hole portion 412 of the mover 4.

In the first upper cushioning material 61, one end in the Y direction is connected to the first upper wire 63, and the other end in the Y direction is connected to the second upper wire 64. The first upper cushioning material 61 and the first upper wire rod 63 are connected by a ring (not shown) or the like through which the first upper cushioning material 63 is inserted and which penetrates the first upper cushioning material 61. Similarly, the first upper cushioning material 61 and the second upper wire rod 64 are connected by a ring (not shown) or the like through which the second upper wire rod 64 is inserted and which penetrates the first upper cushioning material 61. As a result, the first upper cushioning material 61 can be deformed and displaced in the X direction along the first upper wire 63 and the second upper wire 64, and in the Y direction and up and down with respect to the first upper wire 63 and the second upper wire 64. Directional movement is constrained.

The first upper cushioning material 61 is arranged on one side in the X direction with respect to the mover 4, and the end portion on one side in the X direction is below the vicinity of the end portion on one side in the X direction of the first upper inclined surface 211. It is arranged on the side, and the other end in the X direction is arranged on the lower side in the vicinity of the upper bent portion 21a of the first upper inclined surface 211. The end of the first upper cushioning material 61 on one side in the X direction may be in contact with the first upper stopper 51. In the present embodiment, the first upper cushioning material 61 is not connected to the mover 4 and the first upper stopper 51.
Such a first upper cushioning material 61 covers the first upper inclined surface 211 with a gap provided between the first upper cushioning material 61 and the first upper inclined surface 211.

In the second upper cushioning material 62, one end in the X direction is arranged on the lower side near the upper bent portion 21a of the second upper inclined surface 212, and the other end in the X direction is the second upper inclined surface. It is arranged on the lower side near the end on the other side of the 212 in the X direction.
Such a second upper cushioning material 62 covers the second upper inclined surface 212 with a gap provided between the second upper cushioning material 62 and the second upper inclined surface 212.

The pair of lower stoppers 7 and 7 are plate-shaped members arranged so that the plate surfaces face the Y direction, respectively, and one of the first lower stoppers 71 is the X direction of the first lower inclined surface 311 of the lower guide member 3. It is fixed to the lower guide member 3 in a state of protruding upward from one end, and the other second lower stopper 72 is upward from the other end in the Y direction of the second lower inclined surface 312 of the lower guide member 3. It is fixed to the lower guide member 3 in a protruding state.
The first lower stopper 71 and the second lower stopper 72 are arranged on the trajectory when the mover 4 moves relative to the lower guide member 3 in the Y direction, and the mover 4 is arranged in the Y direction of the lower guide member 3. It is configured to prevent it from coming off from both ends.

The pair of lower cushioning materials 8 and 8 are thin-film sheet members similarly formed on at least one of an elastic body such as a rubber sheet and a viscoelastic body having self-restoring properties, and one side in a plan view. Is a long, substantially rectangular shape longer than the other side, and is arranged so that the longitudinal direction is the Y direction and the lateral direction is the X direction.
In the pair of lower cushioning materials 8 and 8, one first lower cushioning material 81 is arranged between the mover 4 and the first lower stopper 71, and the second lower cushioning material 82 is the mover 4 and the second lower stopper 71. It is arranged between 72 and 72. The first lower cushioning material 81 and the second lower cushioning material 82 are supported by the first lower wire rod 83 and the second lower wire rod 84, which are erected between the first lower cushioning material 81 and the first lower stopper 71, respectively.
In addition, in FIG. 1 and FIG. 3, the first lower cushioning material 81 and the second lower cushioning material 82 are shown in the form of a thick sheet for explanation.

The first lower wire rod 83 and the second lower wire rod 84 are wires, steel rods, or the like, which extend in the Y direction and are arranged in parallel with an interval in the X direction.
One end of the first lower wire rod 83 is fixed near the end on one side of the first lower stopper 71 in the X direction, and the other end is fixed near the end on one side of the second lower stopper 72 in the X direction. Has been done. The first lower wire rod 83 is inserted into the third hole portion 413 of the mover 4.
One end of the second lower wire rod 84 is fixed near the other end of the first lower stopper 71 in the X direction, and the other end is fixed near the other end of the second lower stopper 72 in the X direction. Has been done. The second lower wire rod 84 is inserted into the fourth hole portion 414 of the mover 4.

The first lower cushioning material 81 is a thin film-like member formed of at least one of an elastic body such as a rubber sheet having self-restoring property and a viscoelastic body, and one side thereof is larger than the other side in a plan view. It is formed in a long, substantially rectangular shape. The first lower cushioning material 81 is arranged so that the longitudinal direction is the Y direction and the lateral direction is the X direction.

In the first lower cushioning material 81, one end in the X direction is connected to the first lower wire 83, and the other end in the X direction is connected to the second lower wire 84. The first lower cushioning material 81 and the first lower wire rod 83 are connected by a ring (not shown) or the like through which the first lower cushioning material 83 is inserted and which penetrates the first lower cushioning material 81. Similarly, the first lower cushioning material 81 and the second lower wire rod 84 are connected by a ring (not shown) or the like through which the second lower cushioning material 84 is inserted and which penetrates the first lower cushioning material 81. As a result, the first lower cushioning material 81 can be deformed and displaced in the Y direction along the first lower wire 83 and the second lower wire 84, and can be deformed and displaced in the X direction with respect to the first lower wire 83 and the second lower wire 84. Directional movement is constrained.

The first lower cushioning material 81 is arranged on one side in the Y direction with respect to the mover 4, and the end on one side in the Y direction is the upper side near the end on one side in the Y direction of the first lower inclined surface 311. The other end in the Y direction is arranged on the upper side in the vicinity of the lower bent portion 31a of the first lower inclined surface 311. The end of the first lower cushioning material 81 on one side in the Y direction may be in contact with the first lower stopper 71. In the present embodiment, the first lower cushioning material 81 is not connected to the mover 4 and the first lower stopper 71.
Such a first lower cushioning material 81 covers the first lower inclined surface 311 with a gap between the first lower cushioning material 81 and the first lower inclined surface 311.

In the second lower cushioning material 82, one end in the Y direction is arranged on the lower side near the lower bent portion 31a of the second lower inclined surface 312, and the other end in the Y direction is the second lower inclined surface. It is arranged on the lower side near the end on the other side in the Y direction of 312.
Such a second lower cushioning material 82 covers the second lower inclined surface 312 with a gap between the second lower cushioning material 82 and the second lower inclined surface 312.

Subsequently, the behavior of the seismic isolation mechanism 1A will be described.
As shown in FIGS. 5 to 8, when an earthquake occurs and the upper structure 11 and the lower structure 12 are displaced relative to each other in the horizontal direction, the upper guide member 2 and the lower guide member 3 are displaced relative to each other in the horizontal direction. The intersection 10 moves with respect to the upper guide member 2 and the lower guide member 3.
The mover 4 is always arranged at the intersection 10 between the upper guide member 2 and the lower guide member 3. Therefore, as shown in FIGS. 5 and 6, when the mover 4 and the lower guide member 3 are relatively displaced in the Y direction from the initial state shown in FIGS. 1 and 2, 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. Further, as shown in FIGS. 7 and 8 from the initial state, when the mover 4 and the upper guide member 2 are displaced relative to each other in the X direction, the position of the upper guide member 2 with respect to the mover 4 is higher than that in the initial state. It becomes a high position and potential energy (potential energy) is accumulated.

As shown in FIG. 1, in the initial state, the first upper contact surface 441 of the mover 4 comes into contact with the first upper inclined surface 211 of the upper guide member 2, and the second upper contact surface 442 is the upper guide member 2. It is in contact with the second upper inclined surface 212 of the above. Further, in the initial state, the first lower contact surface 451 of the mover 4 comes into contact with the first lower inclined surface 311 of the lower guide member 3, and the second lower contact surface 452 is the second lower inclined surface of the lower guide member 3. It is in contact with the surface 312.

As shown in FIG. 5, when the mover 4 is displaced relative to the lower guide member 3 so as to move from the initial state to the other side in the Y direction with respect to the lower guide member 3, the mover 4 moves to the first lower contact surface 451. Is separated from the first lower inclined surface 311 and moves to the other side in the Y direction with respect to the lower guide member 3 in a state where the second lower contact surface 452 is in contact with the second lower inclined surface 312.
At this time, the second lower cushioning material 82 of the lower cushioning material 8 is pushed by the mover 4 to the other side in the Y direction, sandwiched between the mover 4 and the second lower stopper 72, elastically deformed, and compressed. Become. Then, the restoring force of the second lower cushioning material 82 and the collision of the mover 4 with the second lower stopper 72 via the compressed second lower cushioning material 82 cause the mover 4 to collide with the lower guide member 3. The movement to the other side in the Y direction is stopped, and the movement is stopped toward the other side in the Y direction along the second lower inclined surface 312 to the position in the initial state.

Similarly, as shown in FIG. 6, when the mover 4 is displaced relative to the lower guide member 3 so as to move to one side in the Y direction with respect to the lower guide member 3 from the initial state, the mover 4 moves to the second lower part. The contact surface 452 is separated from the second lower inclined surface 312, and the first lower contact surface 451 moves to one side in the Y direction with respect to the lower guide member 3 in a state of being in contact with the first lower inclined surface 311.
At this time, the first lower cushioning material 81 of the lower cushioning material 8 is pushed by the mover 4 to one side in the Y direction, sandwiched between the mover 4 and the first lower stopper 71, elastically deformed, and compressed. Become. Then, the restoring force of the first lower cushioning material 81 and the collision of the mover 4 with the first lower stopper 71 via the compressed first lower cushioning material 81 cause the mover 4 to collide with the lower guide member 3. The movement to one side in the Y direction is stopped, and the movement is stopped toward the other side in the Y direction along the first lower inclined surface 311 to the position in the initial state.

As shown in FIG. 7, when the mover 4 is displaced relative to the upper guide member 2 so as to move from the initial state to the other side in the X direction with respect to the upper guide member 2, the mover 4 moves to the first upper contact surface 441. Is separated from the first upper inclined surface 211 and moves to the other side in the X direction with respect to the upper guide member 2 in a state where the second upper contact surface 442 is in contact with the second upper inclined surface 212.
At this time, the second upper cushioning material 62 of the upper cushioning material 6 is pushed by the mover 4 to the other side in the X direction, sandwiched between the mover 4 and the second upper stopper 52, elastically deformed, and compressed. Become. Then, the restoring force of the second upper cushioning material 62 and the colliding of the mover 4 with the second upper stopper 52 via the compressed second upper cushioning material 62 cause the mover 4 to collide with the upper guide member 2. The movement to the other side in the X direction is stopped, and the movement is stopped toward the other side in the X direction along the second upper inclined surface 212 to the position in the initial state.

Similarly, as shown in FIG. 8, when the mover 4 is displaced relative to the upper guide member 2 so as to move to one side in the X direction with respect to the upper guide member 2 from the initial state, the mover 4 moves to the second upper part. The contact surface 442 is separated from the second upper inclined surface 212, and the first upper contact surface 441 moves to one side in the X direction with respect to the upper guide member 2 in a state of being in contact with the first upper inclined surface 211.
At this time, the first upper cushioning material 61 of the upper cushioning material 6 is pushed by the mover 4 to one side in the X direction, sandwiched between the mover 4 and the first upper stopper 51, elastically deformed, and compressed. Become. Then, the restoring force of the first upper cushioning material 61 and the collision of the mover 4 with the first upper stopper 51 via the compressed first upper cushioning material 61 cause the mover to X with respect to the upper guide member 2. The movement to one side in the direction is stopped, and the movement is stopped along the first upper inclined surface 211 toward the other side in the X direction to the position in the initial state.

Next, the action / effect of the seismic isolation mechanism 1A according to the first embodiment described above will be described with reference to the drawings.
The seismic isolation mechanism 1A according to the first embodiment described above has a pair of upper stoppers 5 and 5 and a pair of lower stoppers 7 and 7, so that the seismic isolation mechanism 1A has an excessive external force such as a huge earthquake or wind. It is possible to prevent the mover 4 from coming off from the upper guide member 2 and the lower guide member 3 when a one-way load exceeding the sliding limit of the seismic isolation mechanism 1A such as pressure is applied.
By preventing the mover 4 from coming off from the upper guide member 2 and the lower guide member 3, it is possible to significantly shorten the period required for restoration of the seismic isolation mechanism 1A and its surroundings when an excessive external force is applied. It will be possible.
Further, by providing the seismic isolation mechanism 1A for outdoor equipment and the like on which wind pressure acts, it is possible to prevent the seismic isolation mechanism from falling off due to wind pressure.

Further, when the mover 4 moves relative to the upper guide member 2 so as to be close to the upper stoppers 5 and 5, the first upper cushioning material 61 or the second upper cushioning material 62 provided as the upper cushioning material 6 is compressed. As a result, the speed of the mover 4 toward the upper stoppers 5 and 5 is reduced, so that the impact when the mover 4 collides with the upper stoppers 5 and 5 can be reduced. As a result, the acceleration transmitted to the upper structure 11 when the mover 4 collides with the upper stoppers 5 and 5 can be reduced.

Further, when the mover 4 moves relative to the lower guide member 3 so as to be close to the lower stoppers 7 and 7, the first lower cushioning material 81 or the second lower cushioning material 82 provided as the lower cushioning material 8 is compressed. As a result, the speed of the mover 4 toward the lower stoppers 7 and 7 is reduced, so that the impact when the mover 4 collides with the lower stoppers 7 and 7 can be reduced. As a result, the impact when the mover 4 collides with the lower stoppers 7 and 7 can be reduced. As a result, the acceleration transmitted to the upper structure 11 when the mover 4 collides with the lower stoppers 7 and 7 can be reduced.

Further, in order to prevent the mover 4 from coming off from the upper guide member 2 and the lower guide member 3, it is not necessary to lengthen the upper guide member 2 and the lower guide member 3 in the direction of relative displacement with the mover 4, so that the isolation is provided. The installation space of the seismic isolation mechanism 1A can be reduced.
Further, since the upper cushioning materials 6 and 6 are arranged so as to cover the upper inclined surface 21, the upper cushioning materials 6 and 6 can be used as a dustproof cover for the upper inclined surface 21. Further, since the lower cushioning materials 8 and 8 are arranged so as to cover the lower inclined surface 31, the lower cushioning materials 8 and 8 can be used as a dustproof cover for the lower inclined surface 31.

(Second Embodiment)
Next, the second embodiment will be described with reference to the accompanying drawings, but the same or similar members and parts as those in the first embodiment will be described by using the same reference numerals, and the description will be omitted. Different configurations will be described.
As shown in FIGS. 9 to 11, the seismic isolation mechanism 1B according to the second embodiment includes an elastic body such as a rubber sheet having self-restoring property like the seismic isolation mechanism 1A according to the first embodiment as shown in FIG. Belleville spring 93 instead of the upper cushioning materials 6 and 6 and the lower cushioning materials 8 and 8 (see FIGS. 1 to 3) using a thin sheet member similarly formed in at least one of the viscoelastic bodies. The upper cushioning materials 6B and 6B and the lower cushioning materials 8B and 8B are provided.

As shown in FIG. 9, the lower cushioning material 8B has a first lower cushioning material 85 supported by the first lower stopper 71 and a second lower cushioning material 86 supported by the second lower stopper 72. ing. As shown in FIG. 10, the upper cushioning material 6B has a first upper cushioning material 65 supported by the first upper stopper 51 and a second upper cushioning material 66 supported by the second upper stopper 52. ing.
The first upper cushioning material 65, the second upper cushioning material 66, the first lower cushioning material 85, and the second lower cushioning material 86 are formed in the same structure and are supported by the upper stoppers 5, 5, and the lower stopper 7. , 7 and the directions when supported by the upper stoppers 5, 5 and the lower stoppers 7, 7 are different. Therefore, the structure of the second lower cushioning material 86 will be described, and the structures of the first upper cushioning material 65, the second upper cushioning material 66, and the first lower cushioning material 85 will be omitted.

As shown in FIG. 12, the second lower cushioning material 86 is a mover in which a bolt 91 inserted through the second lower stopper 72 and a bolt 91 are connected and arranged on one side of the second lower stopper 72 in the Y direction. It has a disc spring 93 through which the contact portion 92 and the bolt 91 are inserted and arranged between the mover contact portion 92 and the second lower stopper 72.
The bolt 91 is inserted into a through hole 721 formed in the second lower stopper 72 and penetrates in the Y direction, the head 91a is on the other side of the second lower stopper 72 in the Y direction, and the tip of the leg 91b is the first. 2 It is arranged so as to be on one side in the Y direction from the lower stopper 72.
The bolt 91 is inserted into the through hole 721 of the second lower stopper 72 from the other side in the Y direction so that the head 91a cannot insert the through hole 721.

The mover contact portion 92 is a plate material having a substantially inverted L-shaped cross section when viewed from the X direction, and the first plate portion 921 whose plate surface faces in the vertical direction and the other side of the first plate portion 921 in the Y direction. It has a second plate portion 922 that extends downward from the end portion and has a plate surface facing the Y direction.
The tip portion of the leg portion 91b of the bolt 91 is fixed to the second plate portion 922. In the present embodiment, four bolts 91 are fixed to the second plate portion 922.
The lower end of the second plate portion 922 is arranged above the second lower inclined surface 312 of the lower guide member 3 so as to be separated from the second lower inclined surface 312. The second plate portion 922 is configured to be movable relative to the second lower stopper 72 in the Y direction together with the bolt 91.

A first cushioning sheet 923 is attached to the end surface of the first plate portion 921 on one side in the Y direction. A second cushioning sheet 924 is attached to the surface of the second plate portion 922 on one side in the Y direction. The first cushioning sheet 923 and the second cushioning sheet 924 are formed of an elastic body, a viscoelastic body, or the like, and specifically, are formed of an anti-vibration rubber, a silicone-based viscous material, a steel damping rubber, or the like.

As shown in FIG. 13, the disc spring 93 is composed of a known member in which a disc-shaped plate material having a hole 93a formed in the center is formed in a substantially truncated cone shape. In the disc spring 93, the leg portion 91b of the bolt 91 is inserted through the hole portion 93a in the center, the axial direction is the Y direction, and one side in the Y direction has a smaller diameter than the other side, and the second lower stopper 72 and the second plate It is arranged between the portion 922 and the portion 922. The end of the disc spring 93 on one side in the Y direction is in contact with the second plate portion 922, and the end on the other side in the Y direction is in contact with the second lower stopper 72.
The disc spring 93 is configured to be movable relative to the bolt 91, the mover contact portion 92, and the second lower stopper 72 in the Y direction.

As shown in FIGS. 14 to 16, in the seismic isolation mechanism 1B according to the second embodiment, the lower guide member 3 moves the mover 4 together with the upper guide member 2 to the other side in the Y direction with respect to the lower guide member 3. When the first plate portion 921 of the mover contact portion 92 is displaced relative to, the upper end portion of the upper protruding plate portion 42 of the mover 4 and the upper fixing plate 22 for fixing the upper guide member 2 to the upper structure 11 The end surface of the first plate portion 921 on one side in the Y direction comes into contact with the side surface of the upper guide member 2 on the other side in the Y direction, and the second plate portion 922 of the mover contact portion 92 abuts. It comes into contact with the surface of the mover 4 on the other side in the Y direction.
At this time, since the upper guide member 2 comes into contact with the first cushioning sheet 923, the impact when the upper guide member 2 comes into contact with the first plate portion 921 is absorbed by the first cushioning sheet 923. Further, since the mover 4 comes into contact with the second cushioning sheet 924, the impact when the mover 4 comes into contact with the second plate portion 922 is absorbed by the second cushioning sheet 924.

Then, when the mover 4 moves relative to the lower guide member 3 so as to move together with the upper guide member 2 to the other side in the Y direction with respect to the lower guide member 3, the mover contact portion 92 is also pushed to the other side in the Y direction. The disc spring 93 as shown in FIG. 17 (a) is not compressed in the Y direction, and the disc spring 93 as shown in FIG. 17 (b) is a movable element. It is sandwiched between the second plate portion 922 of the contact portion 92 and the second lower stopper 72, elastically deformed, and is in a compressed state so as to be crushed in the axial direction.
Then, by compressing the disc spring 93, the impact transmitted from the mover 4 to the second lower stopper 72 via the second lower cushioning material 86 can be reduced.
At this time, since the bolt 91 is not fixed to the second lower stopper 72 and the second lower stopper 72, the bolt 91 is displaced together with the mover contact portion 92.
When the mover 4 is restored to the initial state, the shape of the disc spring 93 is restored because the force in the Y direction does not act on the disc spring.

The first lower cushioning material 85 is formed so as to be symmetrical with the second lower cushioning material 86 in the Y direction, and similarly to the second lower cushioning material 86, the mover contact portion 92 and the disc spring 93 are bolted. It is attached to the first lower stopper 71 via 91. When the mover 4 moves to one side in the Y direction with respect to the lower guide member 3, the mover 4 comes into contact with the mover contact portion 92 of the first lower cushioning material 85, and the disc spring 93 elastically deforms to move. It is configured to reduce the impact transmitted from the child 4 to the first lower stopper 71.

The first upper cushioning material 65 is formed so as to be vertically symmetrical with the first lower cushioning material 85, and like the second lower cushioning material 86, the mover contact portion 92 and the disc spring 93 are formed via bolts 91. 1 It is attached to the upper stopper 51. When the mover 4 moves to one side in the X direction with respect to the upper guide member 2, the mover 4 comes into contact with the mover contact portion 92 of the first lower cushioning material 85, and the disc spring 93 elastically deforms to move. It is configured to reduce the impact transmitted from the child 4 to the first upper stopper 51.

The second upper cushioning material 66 is formed so as to be symmetrical with the first upper cushioning material 65 in the X direction, and the mover contact portion 92 and the disc spring 93 are interposed via the bolt 91 as in the second lower cushioning material 86. It is attached to the second upper stopper 52. When the mover 4 moves to one side in the X direction with respect to the upper guide member 2, the mover 4 comes into contact with the mover contact portion 92 of the second upper cushioning material 66, and the disc spring 93 elastically deforms. It is configured to reduce the impact transmitted from the mover 4 to the second upper stopper 52.

The seismic isolation mechanism 1B according to the second embodiment is exempted from having the first upper stopper 51, the second upper stopper 52, the first lower stopper 71, and the second lower stopper 72 as in the first embodiment. It is possible to prevent the mover 4 from coming off from the upper guide member 2 and the lower guide member 3 when an excessive external force acts on the seismic isolation mechanism 1B.

In the seismic isolation mechanism 1B according to the second embodiment, when the mover 4 collides with the first lower stopper 71 and the second lower stopper 72 via the first lower cushioning material 85 and the second lower cushioning material 86, the first lower cushioning material 86 is used. The disc spring 93 of the material 85 and the disc spring 93 of the second lower cushioning material 86 are compressed and elastically deformed to reduce the impact when the mover 4 collides with the first upper stopper 51 and the second lower stopper 72. be able to. As a result, when the mover 4 collides with the first lower stopper 71 and the second lower stopper 72, the acceleration transmitted to the upper structure 11 by the reaction force can be reduced.

Further, when the mover 4 collides with the first upper stopper 51 and the second upper stopper 52 via the first upper cushioning material 65 and the second upper cushioning material 66, the disc spring 93 and the second upper cushioning material 65 of the first upper cushioning material 65 collide with each other. The disc spring 93 of the upper cushioning material 66 is compressed and elastically deformed, so that the impact when the mover 4 collides with the first upper stopper 51 and the second upper stopper 52 can be reduced. As a result, the acceleration transmitted to the upper structure 11 when the mover 4 collides with the first upper stopper 51 and the second upper stopper 52 can be reduced.

Further, in the seismic isolation mechanism 1B according to the second embodiment, the first lower cushioning material 85, the second lower cushioning material 86, the first upper cushioning material 65, and the second upper cushioning material 66 utilize a disc spring 93. .. Since the disc spring 93 can absorb a large impact with a small amount of deflection, when the mover 4 collides with the first lower stopper 71, the second lower stopper 72, the first upper stopper 51, and the second upper stopper 52. The impact of the above can be efficiently absorbed, and the first lower cushioning material 85, the second lower cushioning material 86, the first upper cushioning material 65, and the second upper cushioning material 66 can be miniaturized.

Although the embodiment of the seismic isolation mechanism according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified without departing from the spirit of the present invention.
For example, in the seismic isolation mechanisms 1A and 1B according to the above embodiment, the lower guide member 3 and the lower structure 12 are fixed to each other, but the lower guide member 3 and the lower structure 12 can move relative to each other in the horizontal direction. It may be configured. In this case, the friction coefficient between the lower guide member 3 and the lower structure 12 is set to be larger than the friction coefficient between the mover 4 and the upper guide member 2 and the lower guide member 3. By doing so, when the mover 4 collides with the upper stoppers 5 and 5 and the lower stoppers 7 and 7 with an unexpected force, the seismic isolation mechanisms 1A and 1B move relative to the lower structure in the horizontal direction. Thereby, the acceleration transmitted from the lower structure to the upper structure can be reduced.

Further, in the seismic isolation mechanism 1A according to the first embodiment, the upper cushioning materials 6 and 6 and the lower cushioning materials 8 and 8 are at least one of an elastic body such as a rubber sheet having self-restoring property and a viscoelastic body. Although it is a thin-film sheet member formed of, it may be a sheet member using a cloth or the like that does not have self-restoring property.
In the case of a sheet member using cloth or the like that does not have self-restoring property for the upper cushioning materials 6 and 6 and the lower cushioning materials 8 and 8, one end of the sheet member is located near the upper stoppers 5 and 5 and the lower stoppers 7 and 7. It is fixed to the upper inclined surface 21 and the lower inclined surface 31, and the other end is fixed to the mover 4 with a magnet or the like. As a result, when the mover 4 collides with the upper stoppers 5, 5 and the lower stoppers 7, 7, the seat member is compressed and the impact can be reduced. Then, when the mover 4 is restored to the initial state, the seat member is also restored to the initial state. A spring or the like may be used instead of the magnet.
Further, in the seismic isolation mechanism 1A according to the first embodiment, the upper cushioning materials 6 and 6 and the lower cushioning materials 8 and 8 are not fixed to the mover 4, but are fixed if they are elastically deformable. You may.

Further, in the seismic isolation mechanism 1B according to the second embodiment described above, the upper cushioning materials 6B and 6B and the lower cushioning materials 8B and 8B use the disc spring 93, but instead of the disc spring 93, a compression spring or the like is used. A spring member may be used.
Further, as a modification of the seismic isolation mechanism 1B according to the second embodiment, as shown in FIG. 18, a tension spring 94 is inserted through the bolts 91 of the upper cushioning materials 6B and 6B and the lower cushioning materials 8B and 8B. , The tension spring 94 may be arranged between the head 91a of the bolt 91 and the upper stoppers 5, 5 and the lower stoppers 7, 7. With such a configuration, it is possible to reduce the impact when the mover 4 collides with the upper stoppers 5, 5 and the lower stoppers 7, 7 by the disc spring 93 and the tension spring 94. Further, a repulsive force in the direction opposite to the collision direction can be generated, and the mover 4 can be reliably restored to the initial state.

Further, in the seismic isolation mechanism 1B according to the second embodiment, the disc spring 93 has the small diameter side end portion on the mover contact portion 92 side and the large diameter side end portion on the upper stoppers 5 and 5 and the lower stopper. It is arranged so as to be on the 7th and 7th sides. On the other hand, the disc spring 93 is arranged so that the end on the large diameter side is on the mover contact portion 92 side and the end on the small diameter side is on the upper stoppers 5 and 5 and the lower stoppers 7 and 7. Alternatively, as shown in FIG. 19, a plurality of disc springs 93, 93 ... May be arranged so that their axial directions alternate.
Further, in the seismic isolation mechanism 1B according to the second embodiment, the first cushioning sheet 923 and the second cushioning sheet 924 are provided on the mover contact portions 92 of the upper cushioning materials 6B and 6B and the lower cushioning materials 8B and 8B. However, it does not have to be provided.

As described above, if the seismic isolation mechanism according to the present invention is provided with an upper cushioning material and a lower cushioning material capable of absorbing the impact when the mover 4 collides with the upper stoppers 5, 5 and the lower stoppers 7, 7. The form of the upper cushioning material and the lower cushioning material may be other than the above.
Here, the structure 101 in which the seismic isolation mechanism 100 without the upper cushioning material and the lower cushioning material as shown in FIG. 20 is installed, and the upper cushioning material (not shown) and the lower cushioning as shown in FIG. 21. Time history seismic response analysis was performed for each of the structures 102 having the seismic isolation mechanism 1C provided with the materials 8C and 8C.

In any of the structures 101 and 102, the analysis model shows the mass W = 11.56tf of the upper structure 11, the first upper inclined surface (not shown), the second upper inclined surface, the first lower inclined surface 311 and the first lower inclined surface. 2. The friction coefficient μ of the lower inclined surface 312, the inclination angle θ = 0.5 °, and Δμ = tan 1.5 ° = 0.026.
Further, the analysis model has an upper stopper (not shown) and a lower stopper 7 and 7 in any of the structures 101 and 102, and has dimensions from the mover 4 in the initial state to the upper stopper and the lower stopper 7 and 7. It is a rigid spring with a dead band with a of 300 mm.
In the analysis model of the structure 101 in which the seismic isolation mechanism 100 without the partial cushioning material and the lower cushioning material is installed, the upper cushioning material and the lower cushioning materials 8C and 8C are the upper stoppers 5, 5 and the lower stopper 7, The size b from 7 to the 4 side of the mover was 50 mm, which was an insensitive element (1.0 kNs / cm).

The input disturbance was a seismic motion in which the El Centro NS wave was amplified about 3.5 times, assuming an excessive disturbance. FIG. 22 shows an outline of the analysis model.
In the structure 101 in which the upper cushioning material and the lower cushioning materials 8C and 8C are not provided, the maximum displacement from the initial state is 300 mm as shown in FIG. 23 (a), and the maximum acceleration is shown in FIG. 23 (b). Was 5994 gal. The reaction force of the upper stopper and the lower stoppers 7 and 7 was 678 kN.

When the superstructure 11 (mass W = 11.56 tf) is supported by four seismic isolation mechanisms, one seismic isolation mechanism 100 supports a load of 2.89 tf. Assuming that the reference surface pressure of the upper contact surface 44 and the lower contact surface 45 of the mover 4 is 20 MPa, the size of the upper contact surface 44 and the lower contact surface 45 is about 50 mm × 30 mm (50 × 30 × 20 ×). 10 ^-3 = 30kN = 3.1tf> 2.89 ... OK).

When the width dimension of the upper contact surface 44 and the lower contact surface 45 is 50 mm, the width dimension of the upper inclined surface 21 and the lower inclined surface 31 is 80 mm. Then, the width dimensions of the upper guide member 2 and the lower guide member 3 (dimensions in the direction orthogonal to the extending direction) are set to 120 mm together with the width dimensions of the upper protruding plate portions 42, 42 and the lower protruding plate portions 43, 43. .. Assuming that the center height of the impact on which the reaction force acts is 10 mm, it can be shown as follows.
M = 678 x 0.01 = 6078 kNm
The width dimensions of the upper stoppers and lower stoppers 7 and 7 can be shown as follows, assuming that the width dimensions of the lower guide member 3 are 120 mm and the thickness dimensions of the upper stoppers 5 and 5 and the lower stoppers 7 and 7 are 30 mm. ..
Z = 120 × 302/6 = 18000mm ³
Therefore, the ^{σ = 6.78 × 10 6/18000} = 377N / mm 2. This is a steel material of about SS400, and has a value equal to or less than the maximum yield strength. The rigidity of the rigid spring with a dead band was 1.0 × 10 ¹⁰ N / m. Since the response value changes depending on this value, the above examination results are reference values.

On the other hand, in the structure 102 provided with the upper cushioning material and the lower cushioning materials 8C and 8C, the mover 4 collided with the upper cushioning material and the lower cushioning materials 8C and 8C and was decelerated, so that the upper stopper and the lower stopper 7 were decelerated. , 7 did not collide. The maximum displacement was 284 mm as shown in FIG. 24 (a), and the maximum acceleration was 397 gal as shown in FIG. 24 (b).
From the above, by providing the upper cushioning material and the lower cushioning materials 8C and 8C in the seismic isolation mechanism 1C, the impact transmitted to the upper structure 11 can be reduced.
The maximum displacement and the maximum acceleration can be adjusted by adjusting the elastic and viscoelastic values of the upper cushioning materials 6 and 6 and the lower cushioning materials 8 and 8. Therefore, it is possible to give the seismic isolation mechanism a degree of freedom in the final rupture mode (whether displacement is emphasized or acceleration is emphasized).
In addition, it is possible to evaluate the performance of the seismic isolation mechanism including the final stage.

1A, 1B, 1C Seismic isolation mechanism 2 Upper guide member 3 Lower guide member 4 Movable element 5 Upper stopper 6, 6B Upper cushioning material 7 Lower stopper 8, 8B Lower cushioning material 11 Upper structure 12 Lower structure 13 Seismic isolation layer 21 Upper inclined surface 31 Lower inclined surface 44 Upper contact surface 45 Lower contact surface 51 First upper stopper 52 Second upper stopper 65 First upper cushioning material 66 Second upper cushioning material 71 First lower stopper 72 Second lower stopper 81 , 85 1st lower cushioning material 82,86 2nd lower cushioning material 91 Bolt 92 Movable contact part 93 Belleville spring (spring member)

Claims (2)

In the seismic isolation mechanism provided between the superstructure and the substructure that can be displaced relative to each other in the horizontal direction.
An upper guide member provided at the bottom of the upper structure and having an upper inclined surface that is inclined upward in an inverted V shape that is convex upward along one horizontal direction.
A lower guide member provided on the upper part of the lower structure and having a lower inclined surface that is inclined downward in a V shape that is convex downward along the other horizontal direction orthogonal to the one horizontal direction.
It is arranged between the upper guide member and the lower guide member, and can be displaced relative to the upper guide member in the horizontal direction along the upper inclined surface, and the lower portion is arranged along the lower inclined surface. The guide member and the other movable element that can be displaced relative to the horizontal direction,
A pair of upper stoppers supported by the upper guide member and arranged at both ends of the track of the mover with respect to the upper guide member in the horizontal direction.
A pair of upper cushioning materials arranged between the pair of upper stoppers and the mover, respectively.
A pair of lower stoppers supported by the lower guide member and arranged at both ends of the track of the mover with respect to the lower guide member in the horizontal direction.
It has a pair of lower cushioning materials arranged between the pair of lower stoppers and the mover, respectively.
The upper cushioning material has a thin film-like sheet member formed of at least one of an elastic body and a viscoelastic body, and arranged entirely between the upper stopper and the mover.
The lower cushioning material has a thin film-like sheet member formed of at least one of an elastic body and a viscoelastic body, and arranged entirely between the lower stopper and the mover.
A seismic isolation mechanism, characterized in that the upper cushioning material and the lower cushioning material are not connected to the mover. The upper guide member is restricted from moving horizontally with the upper structure.
The lower guide member is configured to be movable relative to the lower structure in the horizontal direction.
The seismic isolation mechanism according to claim 1 , wherein the friction coefficient between the lower guide member and the lower structure is larger than the friction coefficient between the mover and the lower inclined surface.

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