JP2018087608A - Seismic isolation mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic isolation mechanism which can inhibit residual displacement of an upper structure part relative to a lower structure and prevent an acceleration speed of the upper structure part from becoming larger than a theoretical value.SOLUTION: A seismic isolation mechanism includes: a lower guide member 2 provided at an upper part of a lower structure 11 and having a lower slide surface 21 extending along an X direction (one horizontal direction) to become a horizontal surface facing upward; an upper guide member 3 provided at a bottom part of an upper structure 12 and having an upper slide surface 31 extending along a Y direction (another horizontal direction perpendicular to the one horizontal direction) to become a horizontal surface facing downward; a slide element 4 which is disposed between the lower guide member 2 and the upper guide member 3 and can be displaced only relative to the lower guide member 2 in the X direction along the lower slide surface 21 and be displaced relative to the upper guide member 3 in the Y direction along the upper slide surface 31; and a displacement restoration mechanism 5 which restores relative displacement between the lower guide member 2 and the upper guide member 3 in a horizontal direction. The displacement restoration mechanism 5 has constant load springs (a first load spring and a second load spring) 51.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seismic isolation mechanism that supports a building to be seismically isolated or a part of a room in a building.

  In a floor seismic isolation system that isolates only some rooms in a building that is subject to seismic isolation, bearings and sliding bearings are mainly used for the bearings, and laminated rubber and coil springs are used for the displacement recovery mechanism. ing. When a sliding bearing is used for the bearing, the frictional resistance of the sliding bearing becomes the damping force. When a bearing is used for the bearing, an oil damper or the like is additionally used to provide a damping force.

  When a laminated rubber or a coil spring is used for the displacement restoring mechanism, when the displacement increases, the restoring force by the displacement restoring mechanism also increases, and the seismic force (acceleration) acting on the upper structure to be seismically isolated increases. In addition, if the displacement in the seismic isolation layer is small, the restoring force by the displacement restoring mechanism is small and residual displacement is likely to occur. In order to prevent the residual displacement from occurring, it is necessary to increase the spring constant of the displacement restoring mechanism. However, if the spring constant is increased, there is a problem that the seismic force acting on the upper structure also increases.

  On the other hand, the applicant of the present application makes the sliding surfaces (sliding surfaces) fixed to the seismic isolation target lower structure and the upper structure both flat inclined surfaces, and slides between these sliding surfaces. A patent application has already been filed for a sliding seismic isolation mechanism configured with a moving element (see, for example, Patent Document 1). In this sliding seismic isolation mechanism, since the restoring force is constant regardless of the displacement, the residual displacement can be suppressed even when the displacement is small.

JP 2013-130216 A

  However, in the sliding seismic isolation mechanism disclosed in Patent Document 1, the sliding surface is formed into a V-shaped or inverted V-shaped inclined surface. For this reason, when the slider slides along the sliding surface, there is a possibility that the sliding member rotates slightly away from the sliding surface in the vicinity of the bent portion where the gradient of the sliding surface changes. In addition, there is a possibility that a stick-slip phenomenon may occur in which the slider is repeatedly caught or slid on the sliding surface. As a result, the acceleration of the upper structure may be greater than the theoretical value.

  Therefore, an object of the present invention is to provide a seismic isolation mechanism that can suppress the residual displacement of the upper structure portion with respect to the lower structure and can prevent the acceleration of the upper structure portion from becoming larger than the theoretical value.

  In order to achieve the above object, a seismic isolation mechanism according to the present invention is provided in an upper part of a lower structure in a seismic isolation mechanism provided between a lower structure and an upper structure that can be relatively displaced in a horizontal direction. A lower guide member having a lower sliding surface that extends along one horizontal direction and forms a horizontal surface facing upward, and is provided at the bottom of the upper structure and in another horizontal direction orthogonal to the one horizontal direction. An upper guide member having an upper sliding surface that extends along the horizontal plane and faces downward, and is disposed between the lower guide member and the upper guide member, and is arranged along the lower sliding surface. The upper guide member along the upper sliding surface and the other guide member that can be relatively displaced only in the other horizontal direction, the lower guide member, and the first horizontal direction. Horizontal relative displacement with the upper guide member A displacement restoring mechanism that restores the first constant load spring that restores relative displacement between the lower guide member and the slider, the upper guide member, and the slider. And a second constant load spring that restores the relative displacement between the first constant load spring and the second constant load spring.

  In the present invention, the lower sliding surface and the upper sliding surface on which the slider slides are formed in a horizontal plane. Thereby, compared with the case where the lower sliding surface and the upper sliding surface are formed in a V-shape or an inverted V-shape and have a bent portion where the inclination is switched, the present invention has no bent portion, so the slider is Prevents stick-slip phenomenon that rotates away from the lower sliding surface or upper sliding surface, or causes the slider to repeatedly get stuck or slide on the lower sliding surface or upper sliding surface. it can. As a result, the acceleration of the upper structure relative to the lower structure can be prevented from becoming larger than the theoretical value.

  In addition, the displacement restoring mechanism includes the first constant load spring, so that the horizontal displacement between the slider and the lower guide member is one horizontal regardless of the horizontal relative displacement amount between the slider and the lower guide member. The restoring force that restores the relative displacement in the direction is constant, and the other horizontal displacement between the slider and the upper guide member is independent of the other horizontal relative displacement amount between the slider and the upper guide member. The restoring force for restoring the relative displacement is constant. Therefore, the restoring force that restores the relative displacement between the lower structure and the upper structure is constant regardless of the relative displacement between the lower structure and the upper structure, and the residual displacement of the upper structure relative to the lower structure is suppressed. Can do.

  In the seismic isolation mechanism according to the present invention, the displacement restoring mechanism includes a first wire on which a restoring force of the first constant load spring acts, and the first wire is loosened when the first wire is loosened. A first wire winding means capable of winding only a portion, a first pulley on which the first wire is hung, a second wire on which a restoring force of the second constant load spring acts, and the second wire is loosened A second wire winding means capable of winding only the slack of the second wire, and a second pulley on which the second wire is hung, and the slider and the lower guide member The first constant load spring and the first wire winding means are provided on either one of the first and the second guide members, and the first pulley is provided on the other of the slider and the lower guide member. One end of the wire is connected to the first constant load spring. The other end side is connected to the first wire take-up means, and when it is hooked on the first pulley, it extends in the one horizontal direction and forms two straight portions connected on the first pulley side. The second constant load spring and the second wire winding means are provided on one of the slider and the upper guide member, and the slider and the upper guide member are disposed. The second pulley is provided on either one of the upper guide members, and the second wire has one end connected to the second constant load spring and the other end wound on the second wire winding. Is connected to the means, and when placed on the second pulley, it is arranged so as to have a U shape in which two straight portions connected to each other on the second pulley side are formed extending in the other horizontal direction. It may be.

By adopting such a configuration, the displacement restoring mechanism is provided in the vicinity of the slider, the upper guide member, and the lower guide member. Therefore, the displacement restoring mechanism is separated from the slider, the upper guide member, and the lower guide member. Compared with the case where it is provided, the installation space for the seismic isolation mechanism can be reduced.
In addition, since the first wire is arranged in a U shape, when the slider is displaced to the side away from the first pulley with respect to the lower guide member, the first wire is unwound from the first constant load spring. The length of the first wire becomes twice the amount of displacement of the slider with respect to the lower guide member, and a restoring force by a constant load spring acts on each side of the first pulley in the first wire. Thereby, in this invention, since the tension | tensile_strength which the slider received via the 1st wire becomes twice the tension | pulling axial force of a 1st constant load spring, the installation number of a 1st constant load spring can be reduced. The output of the first constant load spring can be reduced.
Further, the second wire is the same as the first wire, and the tensile force received by the slider via the second wire is twice the tensile axial force of the second constant load spring. Can be reduced, or the output of the second constant load spring can be reduced.

Further, in the seismic isolation mechanism according to the present invention, the slider has the first horizontal portion between the first guide portion and the upper guide member that prevents the other horizontal relative displacement with the lower guide member. And a second guide part for preventing relative displacement in the direction.
By adopting such a configuration, the slider can be prevented from being displaced relative to the lower guide member in other horizontal directions and detached from the lower guide member, and can be displaced relative to the upper guide member in one horizontal direction. It can prevent coming off from an upper guide member.

In the seismic isolation mechanism according to the present invention, the first guide portion protrudes downward from each of the other horizontal end portions of the slider, and faces the lower guide member in the other horizontal direction. A pair of first protrusions, and a first sliding member provided on any one of the pair of first protrusions and the lower guide member, the other being slidable, The second guide portion protrudes upward from each of the one horizontal end portions of the slider, the pair of second protrusion portions facing the upper guide member and the one horizontal direction, and the pair of first portions. And a second sliding member provided on either one of the two projecting portions and the upper guide member and slidable on the other.
By adopting such a configuration, the slider can be smoothly displaced relative to the lower guide member in one horizontal direction without detaching from the lower guide member, and the upper guide member without detaching from the upper guide member. Relative displacement can be made smoothly in other horizontal directions.

  According to the present invention, the residual displacement of the upper structure portion can be suppressed, and the acceleration of the upper structure portion can be prevented from becoming larger than the theoretical value.

It is a disassembled perspective view which shows an example of the seismic isolation mechanism which concerns on embodiment of this invention. It is a top view which shows an example of the seismic isolation mechanism which concerns on embodiment of this invention. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a figure which shows a mode that the slider and the lower guide member were displaced relatively. It is a figure which shows the other mode that the slider and the lower guide member relatively displaced. It is a figure which shows a mode that the slider and the upper guide member were displaced relatively. It is a figure which shows the other mode that the slider and the upper guide member relatively displaced. It is a figure explaining the restoring force of a seismic isolation mechanism. It is a graph which shows the relationship between the position of a slider and the tension | tensile_strength of a wire. It is a top view which shows an example of the seismic isolation mechanism which concerns on the modification of this embodiment. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG.

Hereinafter, a seismic isolation mechanism according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10.
As shown in FIGS. 1 to 4, the seismic isolation mechanism 1 according to the present embodiment is provided in the seismic isolation layer 13 between the lower structure 11 and the upper structure 12. In the present embodiment, the lower structure 11 is constituted by a building floor of the building, the upper structure 12 is constituted by a floor panel provided on the upper side of the building floor, and an exemption is provided between the building floor and the floor panel of the building. The seismic isolation mechanism 1 is provided in the seismic layer 13. The seismic isolation layer 13 is provided with a plurality of seismic isolation mechanisms 1.

  The seismic isolation mechanism 1 includes a lower guide member 2 fixed to the upper part of the lower structure 11, an upper guide member 3 fixed to the bottom of the upper structure 12, and the lower guide member 2 and the upper guide member 3. And a displacement restoring mechanism 5 that restores the relative displacement between the lower guide member 2 and the upper guide member 3.

  The lower guide member 2 has a main body portion 22 having a lower sliding surface 21 on which the slider 4 slides, and a fixing portion 23 connected to the lower portion of the main body portion 22 and fixed to the lower structure 11. doing. The main body portion 22 is formed of a substantially rectangular parallelepiped long block member, the longitudinal direction is one horizontal direction (X direction), and the short side direction is another horizontal direction (Y direction) orthogonal to the X direction. It is arranged in the direction that becomes the direction. The upper surface of the main body 22 is a horizontal plane and constitutes the lower sliding surface 21. The lower sliding surface 21 is provided with a sliding material such as Teflon (registered trademark) so as to reduce friction with the slider 4.

  The fixing portion 23 is formed in a plate shape, and is joined to the lower surface of the main body portion 22 in a direction in which the plate surface is a horizontal plane. The fixing part 23 is formed in a substantially rectangular shape larger in the X direction and the Y direction than the main body part 22, and protrudes in the X direction and the Y direction from the main body part 22. The fixing part 23 is fixed to the upper surface of the lower structure 11. As shown in FIG. 2, one corner in the Y direction on one side in the X direction of the fixed portion 23 is a first corner 23 a, and the other corner in the Y direction on one side in the X direction is The second corner 23b, the other corner in the Y direction on the other side in the X direction is the third corner 23c, and the one corner in the Y direction on the other side in the X direction is the fourth corner 23d. To do.

  The upper guide member 3 has a main body portion 32 having an upper sliding surface 31 on which the slider 4 slides, and a fixing portion 33 connected to the upper portion of the main body portion 32 and fixed to the upper structure 12. doing. The main body 32 is formed of a long block-like member having a substantially rectangular parallelepiped shape, and is arranged in a direction in which the longitudinal direction is the Y direction and the short direction is the X direction. The lower surface of the main body 32 is a horizontal surface and constitutes the upper sliding surface 31. The upper sliding surface 31 is provided with a sliding material such as Teflon (registered trademark) so as to reduce friction with the slider 4.

  The fixing portion 33 is formed in a plate shape, and is joined to the upper surface of the main body portion 32 in a direction in which the plate surface is a horizontal plane. The fixing portion 33 is formed in a substantially rectangular shape larger in the X direction and the Y direction than the main body portion 32, and protrudes in the X direction and the Y direction from the main body portion 32. The fixing portion 33 is fixed to the lower surface of the upper structure 12. As shown in FIG. 2, the corner portion on the other side in the X direction on one side in the Y direction of the fixed portion 33 is a first corner portion 33 a, and the corner portion on one side in the X direction on one side in the Y direction is The second corner 33b, the one corner in the X direction on the other side in the Y direction is the third corner 33c, and the other corner in the X direction on the other side in the Y direction is the fourth corner 33d. To do.

  The lower guide member 2 and the upper guide member 3 are arranged so as to overlap with each other in the vertical direction, and the slider is placed at the intersection 10 where the lower guide member 2 and the upper guide member 3 overlap in the vertical direction. 4 is arranged.

The slider 4 includes a first guide portion 42 that prevents relative displacement in the Y direction between the main body portion 41 and the lower guide member 2, and a second guide portion that prevents relative displacement in the X direction between the upper guide member 3. 43.
The main body 41 is formed in a substantially rectangular parallelepiped shape, and is disposed such that the lower surface 41a and the upper surface 41b are horizontal, and the four side surfaces are disposed so as to face the X direction or the Y direction.

Sliding materials 44 and 45 are attached to the lower surface 41a and the upper surface 41b of the main body 41, respectively. The lower surface of the sliding material 44 affixed to the lower surface 41 a of the main body 41 corresponds to the lower abutting surface 44 a that abuts the lower sliding surface 21, and the sliding material 44 affixed to the upper surface 41 b of the main body 41. The upper surface corresponds to the upper contact surface 45 a that contacts the upper sliding surface 31. The lower contact surface 44a and the upper contact surface 45a are both arranged in a horizontal plane.
The sliding members 44 and 45 are made of a material that reduces friction with the lower sliding surface 21 and the upper sliding surface 31, respectively.

The first guide portion 42 includes a pair of first projecting portions 421 and 421 projecting downward from both edges in the Y direction of the main body portion 41, and slips provided on the pair of first projecting portions 421 and 421, respectively. Material (first sliding material) 422, 422.
The pair of first projecting portions 421 and 421 are each formed in a flat plate shape extending in the X direction and having a plate surface facing the Y direction. A lower surface 41a of the main body 41 is disposed between the pair of first protrusions 421 and 421.
The sliding members 422 and 422 are made of a material that reduces friction, such as Teflon (registered trademark), and are provided on surfaces of the pair of first projecting portions 421 and 421 that face each other.

An end surface on one side in the Y direction of the first projecting portion 421 disposed on one side in the Y direction of the pair of first projecting portions 421 and 421 and a side surface facing the one side in the Y direction of the main body portion 41 are The first side surface 4a of the slider 4 is formed so as to be flush with each other.
The end surface on the other side in the Y direction of the first projecting portion 421 disposed on the other side in the Y direction of the pair of first projecting portions 421 and 421 and the side surface facing the other side in the Y direction of the main body portion 41 are The second side surface 4b of the slider 4 is formed so as to be flush with each other.

The second guide portion 43 includes a pair of second projecting portions 431 and 431 projecting downward from both edges in the X direction of the main body portion 41 and a pair of slips provided on the pair of second projecting portions 431 and 431, respectively. Material (second sliding material) 432 and 432.
The pair of second projecting portions 431 and 431 are each formed in a flat plate shape extending in the Y direction and having a plate surface facing the X direction. Between the pair of second projecting portions 431 and 431, the upper surface 41b of the main body 41 is disposed.
The sliding members 432 and 432 are formed of a material that reduces friction, such as Teflon (registered trademark), and are provided on the surfaces of the pair of second projecting portions 431 and 431 facing each other.

An end surface on one side in the X direction in the second projecting portion 431 disposed on one side in the X direction of the pair of second projecting portions 431 and 431, and a side surface facing the one side in the X direction of the main body portion 41 The third side surface 4c of the slider 4 is formed so as to be flush with each other.
The end surface on the other side in the X direction of the second projecting portion 431 disposed on the other side in the X direction of the pair of second projecting portions 431 and 431 and the side surface of the main body portion 41 facing the other side in the X direction The fourth side surface 4d of the slider 4 is formed so as to be flush with each other.

In the slider 4, the lower contact surface 44 a is in contact with the lower sliding surface 21 of the lower guide member 2, and the pair of first projecting portions 421 and 421 of the first guide portion 42 is the main body portion 22 of the lower guide member 2. It arrange | positions above the lower guide member 2 so that it may be arrange | positioned at the both sides of Y direction. At this time, the lower end portions of the pair of first projecting portions 421 and 421 are separated from the upper surface of the fixing portion 23 of the lower guide member 2, and the sliding members 422 provided on the pair of first projecting portions 421 and 421, respectively. 422 is in contact with or close to the side surface of the main body 22 of the lower guide member 2.
Accordingly, when the slider 4 tries to move in the Y direction with respect to the lower guide member 2, at least one of the pair of first projecting portions 421 and 421 contacts the lower guide member 2 in the Y direction. The movement in the Y direction with respect to the guide member 2 is restricted.

In the slider 4, the upper contact surface 45 a contacts the upper sliding surface 31 of the upper guide member 3, and the pair of second projecting portions 431 and 431 of the second guide portion 43 are the main body of the upper guide member 3. It arrange | positions under the upper guide member 3 so that it may be arrange | positioned at the both sides of the X direction of the part 32. FIG. At this time, the upper end portions of the pair of second projecting portions 431 and 431 are separated from the lower surface of the fixing portion 33 of the upper guide member 3, and the sliding members 432 provided on the pair of second projecting portions 431 and 431, respectively. 432 is in contact with or close to the side surface of the main body 32 of the upper guide member 3.
Accordingly, when the slider 4 tries to move in the X direction with respect to the upper guide member 3, at least one of the pair of second projecting portions 431 contacts the upper guide member 3 in the X direction. 3 is restricted from moving in the X direction.

Such a slider 4 is slidable only in the X direction along the lower sliding surface 21 with respect to the lower guide member 2 and along the upper sliding surface 31 with respect to the upper guide member 3. It is configured to be slidable only in the Y direction.
The slider 4 is normally disposed at an upper position above the central portion in the X direction of the lower guide member 2 as shown in FIG. 2 and below the central portion in the Y direction of the upper guide member 3. .

The displacement restoring mechanism 5 includes a first displacement restoring mechanism 5A disposed on one side of the slider 4 in the X direction, a second displacement restoring mechanism 5B disposed on the other side of the slider 4 in the X direction, A third displacement restoring mechanism 5C disposed on one side of the slider 4 in the Y direction and a fourth displacement restoring mechanism 5D disposed on the other side of the slider 4 in the Y direction are provided.
Each of the first to fourth displacement restoration mechanisms 5A to 5D includes a constant load spring 51 provided as a restoration spring, a wire 52 connected to the constant load spring 51, and a wire winding means 53 capable of winding the wire 52. And two pulleys 54 and 55 around which the wire 52 is wound.

  As shown in FIGS. 3 and 4, the constant load spring 51 has a known structure in which a spring-shaped spring material is wound around two drums in opposite directions, and is used, for example, as a blind near a window. Is adopted. The constant load spring 51 is accommodated in the case 56. The constant load spring 51 is provided with a wire winding shaft portion (not shown) capable of winding the wire 52 coaxially with one drum. The constant load spring 51 is configured such that when the wire 52 is unwound from the wire winding shaft portion, a spring reaction force is generated and the wire 52 is wound. Note that the wire winding shaft portion is also accommodated in the case 56, and the wire 52 wound around the wire winding shaft portion is also accommodated in the case 56.

The constant load spring 51 is configured such that the spring reaction force is constant without depending on the amount of displacement, and even if the seismic force (acceleration) is large, the amount of displacement does not exceed a certain value and reaches a peak. Further, the constant load spring 51 does not change the restoring force even when the displacement is small even when the displacement is small, so that the residual displacement hardly occurs even when the displacement is small.
In order to suppress the residual displacement of the slider 4 after the earthquake, the friction force (μ × W) of the sliding bearing (the lower sliding surface 21 and the upper sliding surface 31) is 0.1 by the constant load spring 51. It is preferable to give a restoring force of about 0.2 times.

One end of the wire 52 in the length direction is connected to a wire winding shaft provided in the constant load spring 51, and the other end is connected to a wire winding means 53. The wire 52 is provided with a detent stopper 521 on one end side.
When the slider 4 is in the original position, the wire 52 is displaced so that a predetermined pretension is generated in the constant load spring 51, and the stopper 521 is locked to the case 56.

The wire winding means 53 is provided in order to prevent the wire 52 from slacking, and is configured to apply a minimum tension to the wire 52 so that the wire 52 does not slack, so that the wire 52 can be automatically wound. Yes. The winding ability of the wire 52 by the wire winding means 53 is set to be small so as to hardly affect the winding ability of the wire 52 due to the restoring force of the constant load spring 51.
In this embodiment, the wire winding means 53 includes a spring that is wound around the core material, an outer cylinder portion that accommodates the core material and the spring, and a pulley that is connected to the core material and can wind the wire 52. And have.
When the slider 4 is in the original position, the wires 52 are all pulled out from the winding means 53 and are not wound around the pulley.

  The pulleys 54 and 55 are provided on the fixed portion 23 of the lower guide member 2 or the fixed portion 33 of the upper guide member 3 with the shaft portions 541 and 551 extending in the vertical direction. The pulleys 54 and 55 provided on the fixed portion 23 of the lower guide member 2 have shaft portions 541 and 551 extending upward from the fixed portion 23 of the lower guide member 2. The pulleys 54 and 55 provided on the fixed portion 33 of the lower guide member 2 have shaft portions 541 and 551 extending downward from the fixed portion 33 of the lower guide member 2.

In the first displacement restoring mechanism 5A, the case 56 in which the constant load spring 51 is accommodated is attached in the vicinity of one edge in the X direction on the first side surface 4a of the slider 4, and the outer cylinder of the wire winding means 53 The part is attached in the vicinity of the edge on one side in the X direction on the second side surface 4 b of the slider 4. In the first displacement restoring mechanism 5 </ b> A, the shaft portion of one pulley 54 is provided in the vicinity of the first corner portion 23 a of the fixing portion 23 of the lower guide member 2, and the shaft portion of the other pulley 55 is fixed to the lower guide member 2. The portion 23 is provided in the vicinity of the second corner portion 23b.
The wire 52 is wound around two pulleys 54 and 55 on one side in the X direction of each of the constant load spring 51 and the wire winding means 53 (one side in the X direction of the slider 4), and has a shape in plan view. It arrange | positions so that it may become the substantially U shape opened to the other side of a X direction.

In the second displacement restoring mechanism 5B, the case 56 in which the constant load spring 51 is accommodated is attached in the vicinity of the other side edge in the X direction on the second side surface 4b of the slider 4, and the outer cylinder of the wire winding means 53 The part is attached to the vicinity of the edge on the other side in the X direction on the first side surface 4 a of the slider 4. In the second displacement restoring mechanism 5B, the shaft portion of one pulley 54 is provided in the vicinity of the third corner portion 23c of the fixing portion 23 of the lower guide member 2, and the shaft portion of the other pulley 55 is fixed to the lower guide member 2. The portion 23 is provided in the vicinity of the fourth corner portion 23 d.
The wire 52 is wound around the two pulleys 54 and 55 on the other side in the X direction of the constant load spring 51 and the wire winding means 53 (the other side in the X direction of the slider 4), and has a shape in plan view. It arrange | positions so that it may become the substantially U shape opened to the one side of a X direction.

In the third displacement restoring mechanism 5C, the case 56 in which the constant load spring 51 is accommodated is attached in the vicinity of one edge of the third side surface 4c of the slider 4 in the Y direction. The portion is attached in the vicinity of the edge on one side in the Y direction on the fourth side surface 4 d of the slider 4. In the third displacement restoring mechanism 5C, the shaft portion of one pulley 54 is provided in the vicinity of the first corner portion 33a of the fixing portion 33 of the upper guide member 3, and the shaft portion of the other pulley 55 is fixed to the upper guide member 3. The portion 33 is provided in the vicinity of the second corner portion 33b.
The wire 52 is wound around two pulleys 54 and 55 on one side in the Y direction (one side in the Y direction of the slider 4) of each of the constant load spring 51 and the wire winding means 53, and has a shape in plan view. It arrange | positions so that it may become a substantially U shape opened to the other side of a Y direction.

In the fourth displacement restoring mechanism 5D, the case 56 in which the constant load spring 51 is accommodated is attached in the vicinity of the other side edge in the Y direction on the fourth side surface 4d of the slider 4, and the outer cylinder of the wire winding means 53 is provided. The portion is attached to the vicinity of the edge on the other side in the Y direction on the third side surface 4 c of the slider 4. In the fourth displacement restoring mechanism 5D, the shaft portion of one pulley 54 is provided in the vicinity of the third corner portion 33c of the fixing portion 33 of the upper guide member 3, and the shaft portion of the other pulley 55 is fixed to the upper guide member 3. The portion 33 is provided in the vicinity of the fourth corner portion 33 d.
The wire 52 is wound around the two pulleys 54 and 55 on the other side in the Y direction of each of the constant load spring 51 and the wire winding means 53 (the other side in the Y direction of the slider 4), and has a shape in plan view. It arrange | positions so that it may become the substantially U shape opened to the one side of a Y direction.

  When the slider 4 is disposed at the original position in the X direction, the wires 52 of the first displacement restoring mechanism 5A and the second displacement restoring mechanism 5B are in a state in which the stopper 521 is locked to the case 56, and the wires All are pulled out from the winding means 53. When the slider 4 is disposed at the original position in the Y direction, the wires 52 of the third displacement restoring mechanism 5C and the fourth displacement restoring mechanism 5D are in a state in which the stopper 521 is locked to the case 56, and the wires All are pulled out from the winding means 53.

Next, the behavior of the seismic isolation mechanism 1 will be described.
As shown in FIGS. 5 to 8, when an earthquake occurs and the lower structure 11 and the upper structure 12 are relatively displaced in the horizontal direction, the lower guide member 2 and the upper guide member 3 are relatively displaced in the horizontal direction. The intersection 10 moves relative to the upper guide member 3 and the lower guide member 2. The slider 4 is always disposed at the intersection 10 between the upper guide member 3 and the lower guide member 2.
As shown in FIG. 1, in the original position, the center portion in the X direction of the lower guide member 2, the center portion in the Y direction of the upper guide member 3, and the slider 4 are arranged so as to overlap in the vertical direction.

As shown in FIG. 5, when the upper structure 12 moves to one side in the X direction with respect to the lower structure 11, the upper guide member 3 together with the slider 4 moves to one side in the X direction with respect to the lower guide member 2. Move to.
Accordingly, in the first displacement restoring mechanism 5A, the constant load spring 51 and the wire winding means 53 are close to the two pulleys 54 and 55, so that the tension of the wire 52 is reduced. Thereby, the wire 52 is wound by the wire winding means 53 so as not to loosen. Since the wire 52 is arranged in a substantially U shape, the wire winding means 53 winds up a length that is twice the amount of displacement from the original position of the slider 4 to one side in the X direction.
Note that the wire 52 of the first displacement restoring mechanism 5A is only wound around the wire winding means 53 so as not to be loosened, and is therefore wound around the wire winding shaft provided in the constant load spring 51. The portion is not unwound, and the stopper 521 remains locked in the case 56. For this reason, only the preload acts on the constant load spring 51 and no restoring force is generated.

On the other hand, in the second displacement restoring mechanism 5B, the constant load spring 51 and the wire winding means 53 are separated from the two pulleys 54 and 55, so that the tension of the wire 52 is increased. As a result, the portion of the wire 52 wound around the wire winding shaft provided on the constant load spring 51 is unwound and pulled out from the case 56. The wire 52 is provided in the constant load spring 51 so that the length of the wire 52 is twice the amount of displacement from the original position of the slider 4 to one side in the X direction by being arranged in a substantially U shape. It is unwound from the take-up shaft. As a result, a load exceeding the preload acts on the constant load spring 51 of the second displacement restoring mechanism 5B, and a restoring force is generated.
Since the winding capacity of the wire winding means 53 is so small that it hardly affects the restoring force of the constant load spring 51, the wire 52 of the second displacement restoring mechanism 5B is a wire winding shaft provided on the constant load spring 51. Even if it is unwound from the part, it is not wound around the wire winding means 53 and remains in a state where it is completely unwound from the wire winding means 53.

Then, the restoring force generated in the constant load spring 51 of the second displacement restoring mechanism 5B due to the wire 52 being unwound from the wire winding shaft portion provided in the constant load spring 51, the second displacement restoring mechanism 5B. The wire 52 is wound around the wire winding shaft until the stopper 521 is locked to the case 56. That is, a portion of the wire 52 that has been unwound from the wire take-up shaft provided on the constant load spring 51 is again taken up by the wire take-up shaft. Further, all the portions of the wire 52 of the first displacement restoring mechanism 5A that have been wound around the wire winding means 53 are unwound.
Thereby, the slider 4 is restored to the original position in the X direction.

As shown in FIG. 6, when the upper structure 12 moves to the other side in the X direction with respect to the lower structure 11, the upper guide member 3 together with the slider 4 moves to the other side in the X direction with respect to the lower guide member 2. Move to.
As a result, in the second displacement restoring mechanism 5B, the constant load spring 51 and the wire winding means 53 are close to the two pulleys 54 and 55, so that the tension of the wire 52 is reduced. Thereby, the wire 52 is wound by the wire winding means 53 so as not to loosen. Since the wire 52 is disposed in a substantially U shape, the wire winding means 53 winds up a length twice as large as the displacement amount from the original position of the slider 4 to the other side in the X direction.
Note that the wire 52 of the second displacement restoring mechanism 5B is merely wound around the wire winding means 53 so as not to be loosened, and is therefore wound around the wire winding shaft provided in the constant load spring 51. The portion is not unwound, and the stopper 521 remains locked in the case 56. For this reason, only the preload acts on the constant load spring 51 and no restoring force is generated.

In contrast, in the first displacement restoring mechanism 5A, the constant load spring 51 and the wire winding means 53 are separated from the two pulleys 54 and 55, so that the tension of the wire 52 is increased. As a result, the portion of the wire 52 wound around the wire winding shaft provided on the constant load spring 51 is unwound and pulled out from the case 56. The wire 52 is provided in the constant load spring 51 so that the length of the wire 52 is twice the amount of displacement from the original position of the slider 4 to the other side in the X direction by being arranged in a substantially U shape. It is unwound from the take-up shaft. As a result, a load exceeding the preload acts on the constant load spring 51 of the first displacement restoring mechanism 5A, and a restoring force is generated.
Since the winding capacity of the wire winding means 53 is so small that it hardly affects the restoring force of the constant load spring 51, the wire 52 of the first displacement restoring mechanism 5A is a wire winding shaft provided in the constant load spring 51. Even if it is unwound from the part, it is not wound around the wire winding means 53 and remains in a state where it is completely unwound from the wire winding means 53.

Then, the restoring force generated in the constant load spring 51 of the first displacement restoring mechanism 5A due to the winding of the wire 52 from the wire winding shaft provided in the constant load spring 51 causes the first displacement restoring mechanism 5A. The wire 52 is wound around the wire winding shaft until the stopper 521 is locked to the case 56. That is, a portion of the wire 52 that has been unwound from the wire take-up shaft provided on the constant load spring 51 is again taken up by the wire take-up shaft. Further, all of the portion of the wire 52 of the second displacement restoring mechanism 5B that has been wound around the wire winding means 53 is unwound.
Thereby, the slider 4 is restored to the original position in the X direction.

As shown in FIG. 7, when the upper structure 12 moves to one side in the Y direction with respect to the lower structure 11, the upper guide member 3 together with the slider 4 moves to one side in the Y direction with respect to the lower guide member 2. Move to.
Thereby, in the third displacement restoring mechanism 5C, the constant load spring 51 and the wire winding means 53 are close to the two pulleys 54 and 55, so that the tension of the wire 52 is reduced. Thereby, the wire 52 is wound by the wire winding means 53 so as not to loosen. Since the wire 52 is arranged in a substantially U shape, the wire winding means 53 winds up a length twice as long as the displacement amount from the original position of the slider 4 to one side in the Y direction.
Note that the wire 52 of the third displacement restoring mechanism 5C is only wound around the wire winding means 53 so as not to be loosened, and is therefore wound around the wire winding shaft provided in the constant load spring 51. The portion is not unwound, and the stopper 521 remains locked in the case 56. For this reason, only the preload acts on the constant load spring 51 and no restoring force is generated.

In contrast, in the fourth displacement restoring mechanism 5D, the constant load spring 51 and the wire winding means 53 are separated from the two pulleys 54 and 55, so that the tension of the wire 52 is increased. As a result, the portion of the wire 52 wound around the wire winding shaft provided on the constant load spring 51 is unwound and pulled out from the case 56. The wire 52 is provided in the constant load spring 51 so that the length of the wire 52 is twice the amount of displacement from the original position of the slider 4 to one side in the Y direction by being arranged in a substantially U shape. It is unwound from the take-up shaft. As a result, a load exceeding the preload acts on the constant load spring 51 of the fourth displacement restoring mechanism 5D, and a restoring force is generated.
Since the winding capacity of the wire winding means 53 is so small that it hardly affects the restoring force of the constant load spring 51, the wire 52 of the fourth displacement restoring mechanism 5D is a wire winding shaft provided on the constant load spring 51. Even if it is unwound from the part, it is not wound around the wire winding means 53 and remains in a state where it is completely unwound from the wire winding means 53.

Then, due to the restoring force generated in the constant load spring 51 of the fourth displacement restoring mechanism 5D due to the wire 52 being unwound from the wire winding shaft portion provided in the constant load spring 51, the fourth displacement restoring mechanism 5D. The wire 52 is wound around the wire winding shaft until the stopper 521 is locked to the case 56. That is, a portion of the wire 52 that has been unwound from the wire take-up shaft provided on the constant load spring 51 is again taken up by the wire take-up shaft. Further, all of the portion of the wire 52 of the third displacement restoring mechanism 5C that has been wound around the wire winding means 53 is unwound.
Thereby, the slider 4 is restored to the original position in the Y direction.

As shown in FIG. 8, when the upper structure 12 moves to the other side in the Y direction with respect to the lower structure 11, the upper guide member 3 together with the slider 4 moves to the other side in the Y direction with respect to the lower guide member 2. Move to.
Thereby, in the fourth displacement restoring mechanism 5D, the constant load spring 51 and the wire winding means 53 are close to the two pulleys 54 and 55, so that the tension of the wire 52 is reduced. Thereby, the wire 52 is wound by the wire winding means 53 so as not to loosen. Since the wire 52 is arranged in a substantially U shape, the wire winding means 53 winds up a length that is twice the amount of displacement from the original position of the slider 4 to the other side in the Y direction.
Note that the wire 52 of the fourth displacement restoring mechanism 5D is only wound around the wire winding means 53 so as not to be loosened, and is thus wound around the wire winding shaft provided in the constant load spring 51. The portion is not unwound, and the stopper 521 remains locked in the case 56. For this reason, only the preload acts on the constant load spring 51 and no restoring force is generated.

In contrast, in the third displacement restoring mechanism 5C, the constant load spring 51 and the wire winding means 53 are separated from the two pulleys 54 and 55, so that the tension of the wire 52 is increased. As a result, the portion of the wire 52 wound around the wire winding shaft provided on the constant load spring 51 is unwound and pulled out from the case 56. The wire 52 is provided in the constant load spring 51 so that the length of the wire 52 is twice the amount of displacement from the original position of the slider 4 to the other side in the Y direction by being arranged in a substantially U shape. It is unwound from the take-up shaft. As a result, a load exceeding the preload acts on the constant load spring 51 of the third displacement restoring mechanism 5C, and a restoring force is generated.
Since the winding capacity of the wire winding means 53 is so small that it hardly affects the restoring force of the constant load spring 51, the wire 52 of the third displacement restoring mechanism 5C is a wire winding shaft provided on the constant load spring 51. Even if it is unwound from the part, it is not wound around the wire winding means 53 and remains in a state where it is completely unwound from the wire winding means 53.

Then, the restoring force generated in the constant load spring 51 of the third displacement restoring mechanism 5C due to the winding of the wire 52 from the wire winding shaft portion provided in the constant load spring 51 causes the third displacement restoring mechanism 5C to The wire 52 is wound around the wire winding shaft until the stopper 521 is locked to the case 56. That is, a portion of the wire 52 that has been unwound from the wire take-up shaft provided on the constant load spring 51 is again taken up by the wire take-up shaft. Moreover, all the portions of the wire 52 of the fourth displacement restoring mechanism 5D that have been wound around the wire winding means 53 are unwound.
Thereby, the slider 4 is restored to the original position in the Y direction.

Next, the operation and effect of the seismic isolation mechanism 1 according to this embodiment will be described with reference to the drawings.
In the seismic isolation mechanism 1 according to this embodiment described above, the lower sliding surface 21 and the upper sliding surface 31 on which the slider 4 slides are formed in a horizontal plane. Thereby, compared with the case where the lower sliding surface 21 and the upper sliding surface 31 are formed in a V shape or an inverted V shape and have a bent portion whose inclination is changed, there is no bent portion in the present embodiment. Stick-slip phenomenon in which the rotor rotates away from the lower sliding surface 21 and the upper sliding surface 31, and the slider 4 repeatedly catches and slides on the lower sliding surface 21 and the upper sliding surface 31. Can be prevented. As a result, the acceleration of the upper structure 12 with respect to the lower structure 11 can be prevented from becoming larger than the theoretical value.

  Further, the displacement restoring mechanism 5 uses the constant load spring 51, so that the slider 4 and the lower guide member 2 can be connected to the slider 4 regardless of the relative displacement amount in the X direction as shown in FIG. The restoring force for restoring the relative displacement in the X direction with the lower guide member 2 is constant, and the slider 4 and the upper guide regardless of the relative displacement amount in the Y direction between the slider 4 and the upper guide member 3. The restoring force for restoring the relative displacement in the Y direction with respect to the member 3 is constant. For this reason, the restoring force for restoring the relative displacement between the lower structure 11 and the upper structure 12 is constant regardless of the relative displacement amount between the lower structure 11 and the upper structure 12, and the upper structure 12 relative to the lower structure 11 becomes constant. Residual displacement can be suppressed.

  Further, since the displacement restoring mechanism 5 is provided in the vicinity of the slider 4, the upper guide member 3 and the lower guide member 2, the displacement restoring mechanism 5 is separated from the slider 4, the upper guide member 3 and the lower guide member 2. The installation space of the seismic isolation mechanism 1 can be reduced compared with the case where it is provided.

Further, since the wire 52 is arranged in a U shape, when the slider 4 is displaced to the side away from the two pulleys 54 and 55 with respect to the lower guide member 2, the constant load spring 51. The length of the wire 52 that is unwound from the shaft portion is twice the amount of displacement of the slider 4 relative to the lower guide member 2 and is restored by the constant load springs 51 on both sides of the two pulleys 54 and 55 in the wire 52. Force acts.
Accordingly, as shown in FIG. 10, in this embodiment, when the slider 4 is displaced with respect to the original position, the constant load spring 51 (for example, the slider 4 is pulled) in a state where the slider 4 is pulled. In the case of displacement to one side in the X direction with respect to the original position, the tensile shaft of the constant load spring 51 in a state where the tensile force received via the wire 52 from the constant load spring 51) of the second displacement restoring mechanism 5B is pulled. Since the force is twice, the number of the constant load springs 51 can be reduced, or the output of the constant load springs 51 can be reduced.

  Further, since the slider 4 includes the first guide portion 42 and the second guide portion 43, the slider 4 is relatively displaced in the Y direction with respect to the lower guide member 2 and the lower guide member 2. And can be prevented from being displaced from the upper guide member 3 due to relative displacement in the X direction with respect to the upper guide member 3.

  The first guide part 42 includes a pair of first projecting parts 421 and 421 and sliding materials 422 and 422 provided on the pair of first projecting parts 421 and 421, and the second guide part 43. Has a pair of second projecting portions 431 and 431 and sliding materials 432 and 432 provided on the pair of second guide portions 43. Accordingly, the slider 4 can be smoothly displaced relative to the lower guide member 2 in the X direction without detaching from the lower guide member 2, and can be moved in the Y direction from the upper guide member 3 without detaching from the upper guide member 3. Relative displacement can be performed smoothly.

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 constant load spring 51 and the wire winding means 53 of each of the first to fourth displacement restoring mechanisms 5A to 5D are provided on the slider 4, and the two pulleys 54, 54 are the lower guide members. 2 and the fixing part 33 of the upper guide member 3, and the wire 52 is arranged so as to have a U-shape opening to the slider 4 side.
On the other hand, the constant load spring 51 and the wire winding means 53 of each of the first to fourth displacement restoring mechanisms 5A1 to 5D1 are fixed portions of the lower guide member 2 as in the seismic isolation mechanism 1A shown in FIGS. 23 or the fixed portion 33 of the upper guide member 3, the two pulleys 54 and 55 are provided on the slider 4, and the wire 52 has a U-shape opening to the side away from the slider 4. It may be arranged.

Further, instead of the fixing portion 23 of the lower guide member 2 and the fixing portion 33 of the upper guide member 3, the lower structure 11 and the upper structure 12 are provided with a pulley 54 or a constant load spring 51 and a wire winding means 53. It may be.
In the above embodiment, the first to fourth displacement restoring mechanisms 5A to 5D are wound around the two pulleys 54 and 54 so that the wire 52 is U-shaped, but the number of the pulleys 54 is as follows. It may be set appropriately.
Further, the first to fourth displacement restoring mechanisms 5A to 5D are configured to slide one of the constant load spring 51 and the wire winding means 53 without providing the pulley 54 so that the wire 52 is linearly arranged. Either one may be provided on the moving element 4, and the other may be provided on the fixed portion 23 of the lower guide member 2 or the fixed portion 33 of the upper guide member 3, or may be provided on the lower structure 11 or the upper structure 12.

Moreover, in said embodiment, the slider 4 has a pair of 1st protrusion parts 421 and 421 which protrude below from both edge parts of a Y direction, and a pair of 1st protrusion parts 421 and 421 are the same. The main body portion 22 of the lower guide member 2 is arranged between them. On the other hand, the pair of first projecting portions 421 and 421 is not provided in the slider 4, and instead, a pair projecting upward from both edges in the Y direction to the main body portion 22 of the lower guide member 2. The protrusion 4 may be provided, and the slider 4 may be arranged between the pair of protrusions. Also in such a case, the slider 4 is prevented from moving in the Y direction with respect to the lower guide member 2.
Similarly, the slider 4 is not provided with a pair of second projecting portions 431 and 431 projecting upward, and instead, the main body portion 32 of the upper guide member 3 is respectively moved downward from both edges in the X direction. A pair of projecting portions that project may be provided, and the slider 4 may be arranged between the pair of projecting portions. Also in such a case, the slider 4 is prevented from moving in the X direction with respect to the upper guide member 3.

  In the above-described embodiment, the sliding members 422 and 432 are provided on the pair of first projecting portions 421 and 421 and the pair of second projecting portions 431 and 431 of the slider 4, respectively. It is comprised so that the lower guide member 2 or the upper guide member 3 may be contact | abutted. On the other hand, the lower guide member 2 and the upper guide member 3 are provided with a sliding material, and the sliding material has a pair of first projecting portions 421 and 421 and a pair of second projecting portions 431 and 431 of the slider 4. You may be comprised so that it may contact | abut.

DESCRIPTION OF SYMBOLS 1 Seismic isolation mechanism 2 Lower guide member 3 Upper guide member 4 Slider 5 Displacement restoration mechanism 11 Lower structure 12 Upper structure 21 Lower slide surface 31 Upper slide surface 42 1st guide part 43 2nd guide part 51 fixed Load spring (first constant load spring, second constant load spring)
52 wires (first wire, second wire)
53 Wire winding means (first wire winding means, second wire winding means)
54,55 pulley (first pulley, second pulley)
421 First protrusion 422 Sliding material (first sliding material)
431 2nd protrusion part 432 Sliding material (2nd sliding material)

Claims (4)

In the seismic isolation mechanism provided between the lower structure and the upper structure that can be relatively displaced in the horizontal direction,
A lower guide member provided at an upper portion of the lower structure, and having a lower sliding surface that is a horizontal surface extending along one horizontal direction and facing upward;
An upper guide member having an upper sliding surface provided at the bottom of the upper structure and extending along another horizontal direction orthogonal to the one horizontal direction and serving as a horizontal plane facing downward;
It is disposed between the lower guide member and the upper guide member, and is relatively displaceable only in the one horizontal direction with the lower guide member along the lower sliding surface, and along the upper sliding surface. The upper guide member and the other slider that can be relatively displaced only in the horizontal direction,
A displacement restoring mechanism for restoring relative displacement in the horizontal direction between the lower guide member and the upper guide member,
The displacement restoring mechanism includes a first constant load spring that restores relative displacement between the lower guide member and the slider, and a second constant load spring that restores relative displacement between the upper guide member and the slider. And a seismic isolation mechanism characterized by comprising: The displacement restoring mechanism includes a first wire on which a restoring force of the first constant load spring acts,
First wire winding means capable of winding only the slack of the first wire when the first wire is slack;
A first pulley on which the first wire is hung;
A second wire on which a restoring force of the second constant load spring acts;
Second wire winding means capable of winding only the loosened portion of the second wire when the second wire is loosened;
A second pulley on which the second wire is hung,
The first constant load spring and the first wire winding means are provided on one of the slider and the lower guide member, and the first pulley is on the other of the slider and the lower guide member. Is provided,
The first wire has one end connected to the first constant load spring and the other end connected to the first wire take-up means, and each of the first wires is hooked on the first pulley. Are arranged in a U-shape in which two linear portions extending in the horizontal direction and connected on the first pulley side are formed,
The second constant load spring and the second wire winding means are provided on one of the slider and the upper guide member, and the second pulley is provided on the other of the slider and the upper guide member. Is provided,
One end side of the second wire is connected to the second constant load spring, and the other end side is connected to the second wire take-up means. 2. The seismic isolation mechanism according to claim 1, wherein the seismic isolation mechanism is arranged in a U shape in which two linear portions extending in the horizontal direction and connected on the second pulley side are formed. The slider has a first guide portion for preventing the other horizontal relative displacement with the lower guide member;
The seismic isolation mechanism according to claim 1, further comprising: a second guide portion that prevents the one horizontal relative displacement with respect to the upper guide member. The first guide portion protrudes downward from each of the other horizontal end portions of the slider, and a pair of first protrusion portions facing the lower guide member and the other horizontal direction,
A first sliding member provided on any one of the pair of first projecting portions and the lower guide member, and the other is slidable;
The second guide portion protrudes upward from each of the one horizontal end portions of the slider, and a pair of second protrusion portions facing the upper guide member and the one horizontal direction,
4. The waiver according to claim 3, further comprising: a second sliding member provided on one of the pair of second projecting portions and the upper guide member, and the other of which is slidable. Seismic mechanism.

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