JP5406631B2 - Seismic isolation structure and seismic isolation structure - Google Patents

Description

  The present invention relates to a base isolation structure and a base isolation structure to which the base isolation structure is applied.

  In Patent Document 1, in a seismic isolation floor structure in which a seismic isolation floor is disposed on a floor seismic isolation device provided on a structural floor, a recess is formed in the structural floor (slab), and the floor seismic isolation is formed in the recess. A seismic isolation floor structure has been proposed in which the required floor height is kept low by arranging the devices (see Patent Document 1).

  Further, Patent Document 2 includes a thick laminated rubber between the foundation pillar connected to the foundation pile and the foundation pillar of the building in the seismic isolation / vibration isolation system for the building over the track. By providing the seismic isolation device, there has been proposed a seismic isolation and vibration isolation structure system that improves the seismic performance and enhances the anti-vibration effect against the vibration of railway vehicles running on the track by softening the rigidity in the vertical direction ( (See Patent Document 2).

JP-A-10-176380 JP 2006-249795 A

  As in Patent Document 2, the base isolation structure is provided with a base isolation device between the upper support part (base pillar) and the lower support part (base pillar) (base isolation structure with beams above and below the base isolation layer). In, the effective height under the beam of the lower beam is determined by the position (level) of the lower beam joined to the lower support portion. Similarly, the effective height of the upper beam on the beam is determined by the position (level) of the upper beam joined to the upper support portion.

  Therefore, when trying to secure the effective height below the lower beam and the effective height above the upper beam, the same as the structure without the base isolation device (base isolation layer), The thickness of the seismic isolation layer) and the height of the structure (building height) will increase. Alternatively, if the height of the structure is not changed, the height of the seismic isolation device (the thickness of the seismic isolation layer), the effective height below the beam of the lower beam, and the effective height above the beam of the upper beam Becomes smaller.

  In consideration of the above, the present invention secures at least one of the effective height below the lower beam and the effective height above the upper beam while suppressing an increase in the height of the structure. Is the purpose.

FIG.

  The invention according to claim 1 is the seismic isolation device provided between the upper support part and the lower support part, the upper beam joined to the upper support part, and the lower support part. A lower beam arranged in parallel with the upper beam, and a bent portion formed in at least one of the upper beam and the lower beam and bent in a direction approaching the other beam in a side view, I have.

  In the invention according to claim 1, the bent portion is formed in at least one of the upper beam and the lower beam, and compared with a structure in which the bent portion is not formed in either the upper beam or the lower beam. When the direction away from the seismic isolation device is the outside, the vertical distance between the outer lower beam and the upper beam from the bent portion in a side view is narrowed.

  That is, while suppressing an increase in the height of the structure provided with the seismic isolation device between the lower support portion and the upper support portion, the effective height under the beam of the lower beam and the upper beam At least one of the effective height is secured.

  In the invention of claim 2, the direction away from the seismic isolation device in the plan view is the outside, and in the side view, the upper beam and the lower beam overlap at least a part outside the bent portion. .

  In the invention of claim 2, the upper beam and the lower beam overlap each other in at least a part outside the bent portion in a side view, so that the effective height below the beam of the lower beam and the beam of the upper beam The upper effective height is secured larger than when the upper beam and the lower beam do not overlap.

  According to a third aspect of the present invention, when the lower support portion and the upper support portion move larger than a predetermined relative movement amount in a direction in which a gap between the lower beam and the upper beam becomes narrower, A gap between the upper beam and the lower beam is set so that the beam and the lower beam are in contact with each other or through a shock absorber.

In the invention of claim 3, when the upper support portion and the lower support portion move in a direction in which the gap between the lower beam and the upper beam becomes narrower than a predetermined relative movement amount, Touch. This prevents the upper support portion and the lower support portion from moving more than a predetermined relative movement amount.
The predetermined relative movement amount is determined by a limit deformation amount of the seismic isolation device (preventing excessive deformation of the seismic isolation device), a design specification that allows the upper support portion and the lower support portion to move relative to each other, or the like.

  In addition, by adopting a configuration in which the upper beam and the lower beam are in contact with each other via the shock absorber, the impact when the upper beam and the lower beam are in contact is suppressed.

  According to a fourth aspect of the present invention, when the lower support portion and the upper support portion move larger than a predetermined relative movement amount, any one of the lower support portion, the upper support portion, and the seismic isolation device and the A gap between any one of the lower support part, the upper support part, and the seismic isolation device and the bent part is set so that the bent part comes into contact with the bent part.

In the invention of claim 4, when the upper support portion and the lower support portion move in a longitudinal direction of the beam in which the bent portion is formed to be larger than a predetermined relative movement amount, the upper support portion and the lower support portion One of the part and the seismic isolation device comes into contact with the bent part. This prevents the upper support portion and the lower support portion from moving more than a predetermined relative movement amount.
The predetermined relative movement amount is determined by a limit deformation amount of the seismic isolation device (preventing excessive deformation of the seismic isolation device), a design specification that allows the upper support portion and the lower support portion to move relative to each other, or the like.

  Moreover, the impact at the time of contacting with a bending part is suppressed by setting it as the structure which any one of an upper part support part, a lower part support part, and a seismic isolation apparatus and a bending part contact.

  The invention according to claim 5 is characterized in that the bent portion is formed at least on the lower beam, and an upper concave curved surface on the upper surface or the upper side of the bent portion of the lower beam extending from the lower support portion to both sides. The seismic isolation device is provided on the curved surface provided above or above the bent portion and on the lower end portion of the upper support portion, and is supported by the curved surface and on the curved surface. And a support portion movable along the same.

  In the invention of claim 5, the support portion provided at the lower end portion of the upper support portion is supported by the bottom portion (origin) of the curved surface provided at the upper surface or the upper portion of the bent portion of the lower beam. And at the time of an earthquake, a support part moves along a curved surface, and it has a seismic isolation function.

  Moreover, after an earthquake, a support part returns to the bottom part (origin) of a curved surface. In other words, the bearing portion has a home position return function for returning to the home position.

  In this way, by using the bent portion of the lower beam, the seismic isolation device having the origin return function is realized in a space-saving manner.

  The invention according to claim 6 is the seismic isolation structure according to claim 5, wherein the curved surface is formed in a substantially hemispherical shape.

  In the invention of claim 6, since the curved surface is formed in a substantially hemispherical shape, the support portion moves in all horizontal directions. Therefore, the seismic isolation device has a seismic isolation function and a return to origin function for not only a specific direction but also earthquakes in all directions.

  According to a seventh aspect of the present invention, an attenuation member that attenuates relative movement between the upper support portion and the lower support portion is connected to the upper beam and the lower beam.

  In the invention of claim 7, the damping member is connected to the upper beam and the lower beam arranged in parallel with a gap in plan view. Therefore, the damping member does not affect or has little influence on the effective height of the lower beam and the effective height of the upper beam.

  In the invention according to claim 8, any one of the upper beam and the lower beam is configured by two beams arranged in parallel in a plan view, and either one of the upper beam and the lower beam is a plan view. Are arranged between the two beams arranged in parallel.

  In the invention of claim 8, the lower beam (or upper beam) is arranged between two upper beams (or lower beams) arranged in parallel. Therefore, for example, in a plan view, compared to a configuration in which one upper beam and one lower beam are shifted from each other, a constant load and an earthquake load acting on the structure are supported in a balanced manner.

  The invention of claim 9 is provided with the seismic isolation structure according to any one of claims 1 to 8.

  In the invention of claim 9, while suppressing an increase in the height of the structure, the effective height under the beam of the lower beam connected to the lower support part and the upper beam of the upper beam connected to the upper support part At least one of the effective heights is secured.

  Also, since the upper and lower beams are shifted in plan view (because the upper and lower beams do not overlap in plan view), compared with the case where the upper and lower beams overlap in plan view In addition, the seismic isolation device can be easily maintained from the upper and lower floors of the seismic isolation layer.

  The invention of claim 10 is applied to a structure provided above a railroad line, wherein the bent portion is formed at least on the lower beam, and the lower beam on which the bent portion is formed intersects the line. The seismic isolation structure according to claim 9, wherein the seismic isolation structure is disposed along the direction of the movement.

  In the invention of claim 10, since the lower beam in which the bent portion is formed is arranged along the direction intersecting with the track, the space above the track, that is, the space above the railroad vehicle, has the height of the structure. It is secured while suppressing the increase.

  According to the invention of claim 1, while suppressing an increase in the height of the structure in which the seismic isolation device is provided between the lower support portion and the upper support portion, the effective height under the beam of the lower beam, and At least one of the effective height of the upper beam on the beam can be ensured.

  According to the invention of claim 2, the effective height of the lower beam below the beam and the effective height of the upper beam on the beam are ensured to be large compared to the case where the upper beam and the lower beam do not overlap. Can do.

  According to the invention of claim 3, it is possible to prevent the upper support portion and the lower support portion from moving more than a predetermined relative movement amount.

  According to the invention of claim 4, it is possible to prevent the upper support portion and the lower support portion from moving more than a predetermined relative movement amount.

  According to the invention of claim 5, by using the bent portion of the lower beam, the seismic isolation device having the origin return function can be realized in a space-saving manner.

  According to the invention of claim 6, it is possible to realize a seismic isolation device having a seismic isolation function and a return to origin function with respect to earthquake vibrations in all directions as well as in a specific direction.

  According to the seventh aspect of the present invention, the damping member does not affect the effective height under the beam of the lower beam and the effective height of the upper beam on the beam, or even if given, the effect can be reduced. .

  According to the invention of claim 8, in a plan view, for example, compared with a configuration in which one upper beam and one lower beam are shifted from each other, the normal load acting on the structure and the earthquake load are balanced. Can support well.

  According to the ninth aspect of the present invention, the effective height under the beam of the lower beam connected to the lower support portion and the upper beam connected to the upper support portion are suppressed while suppressing an increase in the height of the structure. At least one of the effective height on the beam is secured.

  According to invention of Claim 10, the space above a track, ie, the space above a railway vehicle, can be secured, suppressing the increase in the height of a structure.

It is a schematic diagram which shows typically the frame structure of the railway station to which the seismic isolation structure of 1st embodiment of this invention was applied. It is a perspective view which shows the seismic isolation structure which concerns on 1st embodiment of this invention. It is a disassembled perspective view of the seismic isolation structure which concerns on 1st embodiment of this invention shown in FIG. It is the side view which looked at the seismic isolation structure which concerns on 1st embodiment of this invention shown in FIG. 1 in the Y direction. It is a top view of the seismic isolation structure which concerns on 1st embodiment of this invention shown in FIG. It is the enlarged plan view which expanded FIG. 5 partially. FIG. 7 is an enlarged plan view showing a state in which an upper column (upper structure portion) has moved in the Y direction from the state of FIG. 6. It is explanatory drawing which shows typically the example by which the lower beam and the upper beam are not arrange | positioned in parallel (or substantially parallel), (A) is the beam which comprises an upper beam bent in the middle, and became narrow It is a figure which shows an example, (B) is a figure which shows the example arrange | positioned diagonally so that a pair of beam which comprises an upper beam may face each other toward the outer side with respect to an upper beam, (C) It is a figure which shows the example arrange | positioned diagonally so that a pair of beam which comprises an upper beam may be separated from each other toward the outer side with respect to a lower beam. It is a perspective view corresponding to FIG. 2 which shows the seismic isolation structure of the 1st modification of 1st embodiment of this invention. It is a perspective view corresponding to FIG. 2 which shows the seismic isolation structure of the 2nd modification of 1st embodiment of this invention. It is a perspective view corresponding to FIG. 2 which shows the seismic isolation structure of the 3rd modification of 1st embodiment of this invention. It is a top view explaining the variation of the lower beam which forms a bending part, (A) is a figure which shows the example which formed the bending part in the beam of all directions, (B) is a figure folded in the beam of three directions It is a figure which shows the example which formed the bending part, (C) is a figure which shows the example which formed the bending part in the beam of two directions, (D) is the example which formed the bending part in the beam of one direction FIG. It is a top view explaining the example by which the upper beam and the lower beam are arrange | positioned and shifted about 45 degrees. It is the side view which looked at the seismic isolation structure which concerns on 2nd embodiment of this invention in the Y direction. It is a side view which shows the state which the upper pillar (upper structure part) moved to the X direction from the state of FIG. In the seismic isolation structure of 2nd embodiment of this invention, it is a side view corresponding to FIG. 15 which shows the example which provided the shock-absorbing member in the side surface of the bending part. It is a disassembled perspective view which shows the seismic isolation structure which concerns on 3rd embodiment of this invention. It is the side view which looked at the seismic isolation structure of 3rd embodiment of this invention shown in FIG. 17 in the Y direction. It is a disassembled perspective view which shows the seismic isolation structure which concerns on 4th embodiment of this invention. It is a top view which shows the seismic isolation structure which concerns on 4th embodiment of this invention. It is a schematic diagram which shows typically the building of the 1st application example by which the seismic isolation structure of this invention was applied and the base isolation modification was carried out. It is a schematic diagram which shows typically the building of the 2nd application example by which the seismic isolation structure of this invention was applied and the seismic isolation repair was carried out. (A) where the seismic isolation structure as a comparative example to which the present invention is not applied is applied is a schematic view schematically showing the structure of the first comparative example, and (B) is the structure of the second comparative example It is a schematic diagram which shows typically.

<First embodiment>
The railway station 10 to which the seismic isolation structure according to the first embodiment of the present invention is applied will be described with reference to FIGS.
FIG. 1 is a front view schematically showing a skeletal structure such as columns and beams in a railway station 10 as a seismic isolation structure to which the seismic isolation structure 100 according to the present invention is applied.

  As shown in FIG. 1, a plurality of foundation piles 12 are provided in the ground, and foundation pillars 20 are connected to each foundation pile 12. Each foundation pillar 20 is raised from the ground, and a plurality of tracks 16 for running the railway vehicle 14 are laid on the ground between the foundation pillars 20. Therefore, the space 22 between each foundation pillar 20 is a space 22 through which the railway vehicle 14 passes. Moreover, in FIG. 1, it has the structure which the rail vehicle 14 drive | works in the direction orthogonal to a figure.

  In each figure, the left-right direction in FIG. 1 (horizontal direction orthogonal to the traveling direction of the railway vehicle 14) is indicated by an arrow X, and the direction orthogonal to FIG. The vertical direction is indicated by an arrow Z.

  A plurality of platforms 18 for passengers to get on and off the railway vehicle 14 are provided beside the track 16. In addition, a multi-layered upper structure part (over-track structure) 50 is constructed on the foundation pillar 20. A concourse, a commercial facility, and the like are provided in each layer (each floor) of the upper structure portion (a structure above the railway) 50. A structural portion having the foundation pillar 20 is referred to as a lower structural portion 52.

  In the present embodiment, the railway station 10 is subjected to seismic isolation repair by placing the seismic isolation device 40 between the upper column 30 and the foundation column 20 that constitute the structural member of the upper structure unit 50 (intermediate). Seismic isolation structure is applied).

  In other words, the foundation column 20 connected to the foundation pile 12 not provided with underground beams to serve as a passage for the railway vehicle 14, and the foundation of the upper structure portion 50 constructed on the foundation column 20. The base isolation device 40 is disposed between the upper column 30 and the base isolation unit 40 so as to be seismically isolated.

  Thus, the seismic isolation layer 102 in which the seismic isolation device 40 is disposed is provided between the upper structure 50 and the lower structure 52 by the seismic isolation modification. In other words, the base isolation layer 102 in which the base isolation device 40 is disposed is provided at the base of the upper structure unit 50. Further, upper beams 180 and 280 and lower beams 150 and 250 are disposed above and below the seismic isolation layer 102 (details of the upper beams 180 and 280 and the lower beams 150 and 250 will be described later).

As shown in FIGS. 2 to 5, a diaphragm 170 having a square shape in plan view is provided at the lower portion of the upper column 30, and similarly, a diaphragm 160 having a square shape in plan view is provided at the upper portion of the basic column 20. The aforementioned seismic isolation device 40 is disposed between the diaphragm 160 and the diaphragm 170.
The diaphragm is a steel plate provided to supplement the stress transmission of the rigid joint between the column and the beam in the steel structure and increase the rigidity of the joint.

As shown in FIGS. 3 and 4, the seismic isolation device 40 is formed in a cylindrical shape in which metal plates and rubber are alternately stacked in the vertical direction (Z direction) and the vertical direction is the axial direction as a whole. A laminated rubber body 42 is provided. In addition, flange plates 44 are integrally attached to both end surfaces of the laminated rubber body 42 in the lamination direction so as to project outward in the radial direction from the laminated rubber body 42.
These flange plates 44 are joined to the diaphragms 160 and 170 by, for example, bolts and nuts.
In the present embodiment, the laminated rubber main body 42 of the seismic isolation device 40 is a thick laminated rubber body made of thick rubber. This thick laminated rubber body has a smaller vertical rigidity (by setting the vertical rigidity to be softer) by increasing the rubber thickness per layer compared to normal laminated rubber. )

  As shown in FIGS. 2 to 5, upper beams 180 and 280 are joined to the diaphragm 170 of the upper column 30 as receiving beams (track floor receiving beams) of the track floor 21 (see FIGS. 1 and 4). The lower beams 150 and 250 as the track floor large beams are joined to the diaphragm 160 of the foundation column 20. That is, as described above, the upper beams 180 and 280 and the lower beams 150 and 250 are provided above and below the seismic isolation layer 102.

Further, the upper beam 180 is disposed along the X direction, and the upper beam 280 is disposed along the Y direction. Similarly, the lower beam 150 is disposed along the X direction, and the lower beam 250 is disposed along the Y direction (see FIG. 5).
Hereinafter, in plan view, the horizontal direction (X direction, Y direction) moving away from the seismic isolation device 40 is referred to as “outside”, and the direction approaching the seismic isolation device 40 is referred to as “inside”.

  The upper beam 180 arranged along the X direction is composed of a pair of beams 182 and 184 arranged side by side with an interval in the Y direction. Similarly, the upper beam 280 arranged along the Y direction is composed of a pair of beams 282 and 284 arranged side by side with an interval in the X direction. The beam 182, the beam 184, the beam 282, and the beam 284 are arranged at the same height.

  The lower beam 150 arranged along the X direction is arranged between the beam 182 and the beam 184 constituting the upper beam 180 in plan view. In other words, the lower beam 150 and the beams 182 and 184 are arranged in parallel with a predetermined gap in plan view (see FIG. 5).

  Similarly, the lower beam 250 arranged along the Y direction is arranged between the beam 282 and the beam 284 constituting the upper beam 280 in plan view. In other words, the lower beam 250 and the beams 282 and 284 are arranged in parallel with a predetermined gap in plan view (see FIG. 5).

Note that the predetermined gap is a gap that is determined based on the amount of horizontal relative movement between the upper column 30 and the foundation column 20 during an earthquake. Specifically, it is determined by the limit deformation amount of the seismic isolation device 40 (preventing excessive deformation of the seismic isolation device 40), the design specifications that allow the upper column 30 and the base column 20 to move relative to each other, and the like. Further, the gap is basically based on the place where the distance between the upper beam and the lower beam is the narrowest.
And in this embodiment, the clearance gap is set by the limit deformation amount (prevention of the excessive deformation | transformation of the seismic isolation apparatus 40) of the seismic isolation apparatus 40. FIG. Details of the limit deformation amount will be described later.

  In the present embodiment, the upper beam 180 (beams 182 and 184) and the upper beam 280 (beams 282 and 284) are made of H-steel having an H-shaped cross section. The lower beam 150 and the lower beam 250 are made of steel having a closed cross-sectional structure with a rectangular cross section. Note that the structures of the upper beams 180 and 280 and the lower beams 150 and 250 of the present embodiment are examples, and are not limited thereto.

  The lower beam 150 disposed in the X direction orthogonal to the line 16 (see FIG. 1) is formed with a bent portion 152 that is bent in a direction approaching the upper beam 180 in a side view as viewed in the Y direction. In other words, the lower beam 150 is formed with a bent portion 152 that is inclined upward toward the outside. The portion 154 outside the bent portion 152 in the lower beam 150 is horizontally arranged. Therefore, the layer thickness is narrower outside the bent portion 152 in the seismic isolation layer 102 (see FIGS. 1 and 4).

  In the present embodiment, the inner end of the bent portion 152 is joined to the diaphragm 160. However, although illustration is omitted, a horizontal portion may be formed between the diaphragm 160 and the bent portion 152. Even when the horizontal portion is formed, it is desirable that the bent portion 152 be formed in the vicinity of the seismic isolation device 40 (in order to ensure a wide space below the lower beam 150 described later).

  In addition, the portion 154 outside the bent portion 152 of the lower beam 150 overlaps the upper beam 180 in a side view as viewed in the Y direction. That is, the portion 154 outside the bent portion 152 in the lower beam 150 is disposed between the pair of beams 182 and 184 that constitute the upper beam 180.

  In the present embodiment, no bent portion is formed in the lower beam 250 arranged parallel to the line 16, that is, along the Y direction.

As shown in FIG. 6, in this embodiment, the gap (distance) S1 between the lower beam 150 arranged on the left side in the X direction in the drawing and the beam 182 constituting the upper beam 180 of the seismic isolation device 40 The gap (distance) S2 between the lower beam 150 and the beam 184 constituting the upper beam 180 is set to be the same. Furthermore, a gap (distance) S3 between the lower beam 150 and the beam 182 constituting the upper beam 180 arranged on the right side of the seismic isolation device 40 in the figure, and a beam 184 constituting the lower beam 150 and the upper beam 180, The gap (distance) S4 is set to be the same as S1 (= S2). That is, in the present embodiment, S1 = S2 = S3 = S4 is set.
As described above, S1 = S2 is determined by the limit deformation amount of the seismic isolation device 40 (prevention of excessive deformation of the seismic isolation device 40), the design specifications that allow the upper column 30 and the base column 20 to move relative to each other, and the like. In this embodiment, the limit deformation amount of the seismic isolation device 40 (prevention of excessive deformation of the seismic isolation device 40) is set (details will be described later).

  In this embodiment, the gap (distance) S5 between the lower beam 250 arranged on the lower side in the Y direction in the drawing and the beam 282 constituting the upper beam 280 of the seismic isolation device 40, the lower beam 250, A gap (distance) S4 between the upper beam 280 and the beam 284, and between the lower beam 250 disposed on the upper side in the Y direction of the seismic isolation device 40 and the beam 282 constituting the upper beam 280. The gap (distance) S7 and the gap (distance) S8 between the lower beam 250 and the beam 284 constituting the upper beam 280 are set to be the same as S1. That is, in the present embodiment, S1 = S2 = S3 = S4 = S5 = S6 = S7 = S8 is set. Therefore, hereinafter, when it is not necessary to distinguish between these, it will be described as a gap S1.

  In the present embodiment, S1 = S2 = S3 = S4 = S5 = S6 = S7 = S8 is set, but the present invention is not limited to this.

As shown in FIGS. 2 to 5, a metal damper (metal hysteresis damper) 46 is joined between a corner portion of the diaphragm 170 of the upper column 30 and a corner portion of the diaphragm 160 of the base column 20. The metal damper 46 is configured such that a strip-shaped metal plate is curved in a substantially U shape.
The metal damper 46 may be joined to flange plates 44 that are integrally attached to both end surfaces of the laminated rubber body 42 in the laminating direction (laminated rubber integrated seismic isolation U-shaped damper).

  Moreover, the oil damper 60 is arrange | positioned along the X direction in the X direction both outer side of the seismic isolation apparatus 40. As shown in FIG. One end 62 of the oil damper 60 is coupled to a portion 154 outside the bent portion 152 of each lower beam 150 arranged on both outer sides in the X direction of the seismic isolation device 40 so as to be rotatable in the horizontal direction.

4 and 5, the oil damper 60 disposed on the left side in the X direction extends outward (in a direction away from the seismic isolation device 40), and the other end 64 is hung on the beams 182 and 184 constituting the upper beam 180. It is connected to the connecting portion 66 that is passed and joined so as to be rotatable in the horizontal direction.
4 and 5, the oil damper 60 arranged on the right side in the X direction extends inward (in a direction approaching the seismic isolation device 40), and the other end 64 is hung on the beams 182 and 184 constituting the upper beam 180. It is connected to the connecting portion 66 that is passed and joined so as to be rotatable in the horizontal direction.

Next, the operation of this embodiment will be described.
As shown in FIG. 1 and FIG. 4, the bent portion 152 is formed in the lower beam 150 arranged along the X direction, so that the outer side of the bent portion 152 in the side view as viewed in the Y direction. , In the vertical direction between the outer portion 154 and the upper beam 180 that are formed between the bent portion 152 and the bent portion 152 formed at the left and right ends in the X direction of the lower beam 150 in a side view as viewed in the Y direction. (See FIG. 1).
In other words, the layer thickness between the bent portion 152 and the bent portion 152 in the seismic isolation layer 102 is reduced.

  Further, in the present embodiment, the lower beam 150 and the upper beam 180 overlap each other at a portion 154 (between the bent portion 152 and the bent portion 152) outside the bent portion 152 in the lower beam 150. . Therefore, the layer thickness of the seismic isolation layer 102 is one beam (the height of the lower beam 150 or the upper beam 180 in the vertical direction).

  Here, FIGS. 23A and 23B schematically show a structure to which a seismic isolation structure as a comparative example to which the present invention is not applied is applied.

  As shown in the first comparative example of FIG. 23A, a base isolation structure (an upper beam 180 and a lower beam 151 above and below the base isolation layer 101) in which a base isolation device 40 is provided between the upper column 30 and the foundation column 20 is provided. The effective height K1 under the beam of the lower beam 151 is determined at the position (level) of the lower beam 151 joined to the foundation column 20. Similarly, the effective height K2 of the upper beam 180 on the beam is determined at the position (level) of the upper beam 180 joined to the upper column 30. Note that the bent portion 152 (see FIG. 2 and the like) is not formed in the lower beam 151.

  Therefore, an attempt is made to secure an effective height K1 below the lower beam 151 and an effective height K2 (floor height) above the beam of the upper beam 180 as in the structure without the seismic isolation device 40 (the seismic isolation layer 101). Then, the height of the seismic isolation device 40 (the thickness of the seismic isolation layer 101) and the height of the structure 11 (building height) increase. Alternatively, when the height of the structure 11 is not changed, the height of the seismic isolation device 40 (the thickness of the seismic isolation layer 101), the effective height K1 below the beam of the lower beam 151, and the upper beam 180 The effective height K2 on the beam is reduced.

  Further, as shown in the second comparative example of FIG. 23B, if the structure does not include the lower beam 151, the effective height K1 below the beam (in this case, without changing the height of the structure 11) It is possible to secure an effective height K2 above the upper beam 180) and above the upper beam 180. However, if the lower beam is not provided, the stress load on the foundation column 21 increases accordingly. Therefore, it is necessary to increase the column cross section of the foundation column 21. That is, in FIG. 23A, the diameter of the foundation pillar 20 is A, but as shown in FIG. As a result, the effective area of the lower space under the beam (next to the foundation column 21) is reduced. That is, in FIG. 23B, the width in the X direction becomes narrower by “(diameter B−diameter A) × 2”.

On the other hand, in the case of the seismic isolation structure 100 of this embodiment shown in FIG. 1 etc., the bending part 152 is formed in the lower beam 150, suppressing an increase in the height of the entire railway station 10 (or The effective height under the beam of the lower beam 150 without increasing the height) and without increasing the column cross section of the basic column 20 and reducing the effective area of the lower space under the beam (next to the basic column 20). The height K1 (more precisely, the effective height K1 below the beam of the portion 154 outside the lower beam 150) is secured. Further, an effective height (floor height) K2 on the beam of the upper beam 180 is also secured.
In addition, in order to ensure the space under the beam of the lower beam 150 as wide as possible, it is desirable that the bent portion 152 is formed in the vicinity of the seismic isolation device 40.

  In the present embodiment, since the lower beam 150 in which the bent portion 152 is formed is disposed along the X direction orthogonal to the track 16, the space above the track 16, that is, the space above the railway vehicle 14 is Secured.

  In addition, the distance K3 between the end of the platform 18 (railway vehicle 14) and the foundation pillar 20 needs to be wide enough for people to pass through. Therefore, as in this embodiment, it is preferable that the effective height K2 of the lower beam 150 is ensured without increasing the column cross section of the foundation column 20. In other words, the railway station 10 has various design standards and design restrictions such as building height, space on the railway vehicle (effective height K1), traffic width on the platform 18, etc. By applying this structure, These can be satisfied easily while improving the seismic performance of the entire railway station 10.

  The oil damper 60 is connected to the upper beam 180 and the lower beam 150 arranged along the X direction. Therefore, as shown by a two-dot broken line (imaginary line) in FIG. 5, the oil along the X direction is bridged between the lower beam 250 and the upper beam 280 (beam 282) arranged along the Y direction. Compared to the configuration in which a damper is installed, the effective height K1 on the lower side of the oil damper 60 is not affected or is less affected.

  Further, the lower beam 150 and the lower beam 250 are arranged between a pair of beams 182 and 184 and a pair of beams 282 and 284 that constitute the upper beams 180 and 280 arranged in parallel (parallel in the present embodiment) in plan view. Has been placed. Therefore, for example, as compared with a configuration in which one upper beam and one lower beam are shifted from each other in plan view, a normal load and an earthquake load acting on the lower structure 52 are supported in a balanced manner.

  Further, since the upper beams 150 and 250 and the lower beams 180 and 280 are arranged so as to be shifted in a plan view, the seismic isolation device is installed from the upper and lower floors of the seismic isolation layer as compared with the case where the upper beam and the lower beam overlap. 40 can be easily maintained.

Next, the behavior during an earthquake will be described.
In the railway station 10 to which the seismic isolation structure 100 of the present embodiment is applied and is subjected to the seismic isolation repair, the horizontal shaking is absorbed by the seismic isolation device 40 at the time of the earthquake, and the upper structure portion above the seismic isolation device 40 is absorbed. The swing to 50 is reduced. In addition, the oil damper 60 and the metal damper 46 suppress the shaking of the upper structure 50 (deformation of the seismic isolation layer 102) and attenuate the shaking. In addition, since the seismic isolation function by such a seismic isolation apparatus 40, the oil damper 60, and the metal damper 46 is the same as that of the structure to which the conventional intermediate seismic isolation structure was applied, detailed description is abbreviate | omitted.

  Except at the time of the earthquake, vibration from the railway vehicle 14 running on the track 16 is transmitted to the upper structure portion 50 of the railway station 10 via the foundation pillar 20. However, in the present embodiment, the laminated rubber body 42 constituting the seismic isolation device 40 is constituted by a thick laminated rubber body. And since the thickness type | mold laminated rubber body is set to the rigidity of the perpendicular direction softly, the anti-vibration effect which suppresses transmission of the vibration from the rail vehicle 14 to the upper structure part 50 is heightened.

  On the other hand, the lower structure 52 below the seismic isolation device 40 (the seismic isolation layer 102) is designed so as to reduce deformation by the input reduction effect of the high-rigidity frame and the seismic isolation structure 100, and to ensure deformation limitation. Has been.

  Here, a deformation limit value M is defined for the deformation amount of the seismic isolation device 40 at the time of the earthquake (the horizontal relative movement amount of the upper column 30 and the foundation column 20), and even during the L2 earthquake, the deformation is limited. It is designed not to exceed the limit value M. In other words, even during an L2 earthquake, the amount of deformation of the seismic isolation device 40 (the amount of relative movement in the horizontal direction between the upper column 30 and the foundation column 20) is designed to be smaller than the deformation limit value M. Yes.

In the present embodiment, the gap (distance) S1 (see FIG. 6) between the beams 182 and 184 constituting the lower beam 150 and the upper beam 180 is the same as the deformation limit value M of the seismic isolation device 40. It is set slightly larger than the deformation limit value M. Therefore, even at the time of the L2 earthquake, the outer portion 154 (the portion overlapping the beams 182 and 184 in a side view, see FIGS. 2 and 4) from the bent portion 152 of the lower beam 150, the beams 182 and 184, Will not touch. That is, the seismic isolation performance of the seismic isolation device 40 is exhibited to the maximum even during the L2 earthquake.
The L2 earthquake (level 2 earthquake) is an extremely rare earthquake (once every 500 years).

However, when a large shake exceeding the L2 earthquake occurs, the seismic isolation device 40 is excessively deformed by the deformation limit value M or more.
In such a case, as shown in FIG. 7, the seismic isolation device 40 is S1 (deformation limit value M or more) in the direction in which the gap between the lower beam 150 and the upper beam 180 is narrowed (Y direction in the present embodiment). When it is deformed (when the upper column 30 and the foundation column 20 move relative to each other), the lower beam 150 and the beams 182 and 184 come into contact with each other to prevent further movement (in FIG. State diagram).
Therefore, the seismic isolation device 40 is prevented from being excessively deformed by S1 or more. That is, the gap (distance) S1 between the lower beam 150 and the beams 182 and 184 is the maximum deformation amount in the Y direction. The clearance S1 is set to a maximum deformation amount that ensures safety even if the seismic isolation device 40 is excessively deformed.

  Thus, the lower beam 150 (the outer portion 154) and the upper beam 180 (the beams 182 and 184) have a stopper function that prevents excessive deformation of the seismic isolation device 40 (ensures safety). . To be precise, S1 is a gap between the outer portion 154 of the lower beam 150 that overlaps the upper beam 180 in a side view and the narrowest portion between the beams 182 and 184.

  Further, as shown in FIG. 6, an impact buffering member (energy absorbing material) 186 that cushions an impact at the time of contact is provided at a site where the lower beam 150 (the outer part 154) and the beams 182 and 184 abut. Also good. That is, the lower beam 150 and the beams 182 and 184 may be in contact with each other via the shock absorbing member 186.

  As the impact buffer member 186, an elastic member such as rubber or a foamed resin such as urethane foam can be used. Moreover, in FIG. 6, although it is the structure by which the shock-absorbing member 186 was joined to the side surface of the beams 182 and 184, it is not limited to this. An impact buffer member 186 may be joined to the side surface of the lower beam 150. Further, an impact buffer member 186 may be joined to both the beams 182 and 184 and the side surfaces of the lower beam 150.

  Further, as shown in FIG. 7, the oil damper 60 has one end 62 and the other end 64 that are attachment portions rotatably connected in the horizontal direction and expands and contracts in the axial direction, so that the lower beam 150, the beam 182, Even if the 184 and the 184 move relative to each other in the Y direction, for example, a problem such as breakage of the mounting portion of the oil damper 60 does not occur.

  In the present embodiment, the lower beam 150 and the upper beam 180 (beams 182 and 184) are arranged in parallel (or substantially parallel). Therefore, the gap (distance) S1 between the lower beam 150 and the beams 182 and 184 is constant (or substantially constant). However, the lower beam 150 and the beams 182 and 184 do not have to be arranged in parallel.

For example, as shown in FIG. 8A, the beams 182 and 184 may be bent in the middle and the outside may be narrow.
Alternatively, as shown in FIG. 8B, the beams 182 and 184 may be disposed obliquely with respect to the lower beam 150 (X direction) so as to approach each other toward the outside.
Alternatively, as shown in FIG. 8C, the beams 182 and 184 may be disposed obliquely with respect to the lower beam 150 (X direction) so as to be separated from each other toward the outside.

  In such a case, the gaps S1 and S2 between the lower beam 150 (the outer portion 154) and the minimum width portions of the beams 182 and 184 are the same as the deformation limit value M of the seismic isolation device 40 or from the deformation limit value M. Is set slightly larger and the maximum deformation is set.

Note that FIG. 8A may be bent halfway and wide on the outside. Alternatively, only one of the beams may be bent. 8B and 8C, only one of the beams 182 and 184 may be disposed obliquely with respect to the lower beam 150.
Or the structure by which the lower beam was bent may be sufficient, and the structure arrange | positioned diagonally with respect to the X direction may be sufficient.
Whatever the configuration, the gap S1, S2 between the lower beam 150 (the outer part 154) and the smallest width part of the beams 182, 184 is the same as the deformation limit value M of the seismic isolation device 40, or the deformation limit value M Is set to be slightly larger and the maximum deformation amount is set.

  In a general intermediate seismic isolation structure, in order to ensure safety, it is necessary to separately provide a stopper mechanism that suppresses excessive deformation in which the seismic isolation device 40 deforms beyond the deformation limit. However, as described above, since the upper beam and the lower beam also serve as a stopper mechanism, it is not necessary to provide a separate stopper mechanism. Therefore, compared with a case where a separate stopper mechanism is provided, cost reduction and space saving are realized.

In this embodiment, the stopper mechanism is applied to prevent excessive deformation exceeding the deformation limit value M of the seismic isolation device 40, but the present invention is not limited to this. For example, a stopper mechanism may be applied in order to ensure a required clearance in terms of design specifications.
In other words, in the present embodiment, the predetermined gap, that is, the horizontal relative movement amount between the upper column 30 and the foundation column 20 is the limit deformation amount of the seismic isolation device 40 (the excessive deformation of the seismic isolation device 40). However, the present invention is not limited to this. For example, the upper column 30 and the foundation column 20 may be determined by a design specification or the like that allows relative movement.

Here, in the railway station 10 like this embodiment, in order to straddle the track (track) 16, it is difficult to provide a rigid underground beam that connects the foundations to each other. It is said that it is difficult to provide a seismic isolation layer (it is difficult to make a base seismic isolation structure).
Further, due to design restrictions such as building limits, it is basically impossible to move the platform 18 (isolation). Furthermore, it is necessary to prevent any obstacles to human traffic lines and building limits including the range of motion during the largest earthquake.
Therefore, in order to satisfy these, in the present embodiment, the seismic isolation device 40 is disposed between the upper column 30 and the foundation column 20 constituting the structural member of the upper structure unit 50 (railway station 10). The seismic isolation has been improved (intermediate seismic isolation structure is applied).
Further, the railway station 10 is often provided with a structure such as a pedestrian deck adjacent thereto. In this way, when a structure is installed adjacent to each other, if a basic seismic isolation structure is used, a large scale expansion seam that takes into account the relative deformation during an earthquake will occur at the boundary with the adjacent structure. Often required.
On the other hand, when the intermediate layer seismic isolation structure as in the present embodiment is adopted, the displacement below the seismic isolation layer 102, that is, the displacement of the lower structure 52 is the same as the displacement of the adjacent structure. For this reason, it is possible to cope with a small expansion / contraction seam, compared to the case of the basic seismic isolation structure.

<Modification of First Embodiment>
Next, a modification of this embodiment will be described. In addition, the same code | symbol is attached | subjected to the member same as the said embodiment, and the overlapping description is abbreviate | omitted.

<First modification>
First, a first modification will be described with reference to FIGS. 9 and 12A.
As shown in FIG. 9, in the seismic isolation structure 104 of the first modified example, a bent portion 252 is also formed in the lower beam 256. Further, in a side view as viewed in the X direction, a portion 254 outside the bent portion 252 of the lower beam 256 overlaps the upper beam 280. That is, the part 254 outside the bent portion 252 in the lower beam 256 is disposed between the pair of beams 282 and 284 constituting the upper beam 280 (see FIG. 12A).

  Moreover, the oil damper 60 is arrange | positioned along the Y direction on the both outer sides of the seismic isolation device 40 in the Y direction. One end 62 of the oil damper 60 is connected to a portion 254 outside the bent portion 252 of each lower beam 250 so as to be rotatable in the horizontal direction. Further, the other end 64 of the oil damper 60 is connected to a connecting portion 66 that is spanned and joined to a beam 282 and a beam 284 that constitute the upper beam 280 so as to be rotatable in the horizontal direction.

  Since the other configuration is the same as that of the above embodiment, detailed description thereof is omitted. In FIG. 12A, the oil damper is not shown. In FIG. 9, the seismic isolation device 40 is not illustrated, but is actually disposed between the diaphragm 160 and the diaphragm 170.

Next, the operation of this modification will be described.
As shown in FIG. 9, by forming a bent portion 252 in the lower beam 256 arranged along the Y direction, the bent portion 252 in the side view as viewed in the X direction is outside (illustrated in the present embodiment). Is omitted, but the space in the vertical direction between the upper beam 280 and the region 254 between the bent portion 252 and the bent portion 252 formed at the left and right ends of the lower beam 250 in the side view is narrow. Become.
In other words, the layer thickness between the bent portion 252 and the bent portion 252 in the seismic isolation layer 102 is reduced.

  When the seismic isolation device 40 moves beyond the deformation limit value M in the direction in which the gap between the lower beam 256 and the upper beam 280 is narrowed (X direction in the present embodiment) (the upper column 30 and the foundation column 20 are relative to each other). When moved), the lower beam 256 and the beams 282 and 284 hit each other, and excessive deformation is prevented. Thus, the lower beam 256 and the upper beam 280 have a stopper function that prevents excessive deformation. That is, the gap (distance) S1 (= S5 to S8) between the upper beam 280 and the lower beam 256 is the maximum amount of deformation in the X direction. The clearance S1 is set to a maximum deformation amount that ensures safety even if the seismic isolation device 40 is excessively deformed.

  In the present embodiment, each predetermined gap is set to satisfy S1 = S2 = S3 = S4 = S5 = S6 = S7 = S8, but is not limited thereto. When changing the maximum deformation amount in each direction, S1 to S8 may be set as appropriate.

<Second modification>
Next, a second modification will be described with reference to FIG. Similar to the first modification, the seismic isolation device 40 is not illustrated in FIG. 10, but is actually disposed between the diaphragm 160 and the diaphragm 170.

As shown in FIG. 10, in the seismic isolation structure 105 of the second modified example, the lower beam 165 arranged along the X direction is composed of a pair of beams 161 and 171 arranged in parallel. The beam 161 is formed with bent portions 162 and 172 that are inclined upwardly toward the outer side of the beam 161, respectively.
In a plan view, the upper beam 190 arranged along the X direction is arranged between the beam 161 and the beam 171 constituting the lower beam 165. In other words, the upper beam 190 and the beams 161 and 171 are arranged in parallel with a predetermined gap in plan view.

Further, the portions 164 and 174 outside the bent portions 162 and 172 of the beams 161 and 171 overlap the upper beam 190 in a side view as viewed in the Y direction. That is, the upper beam 190 is disposed between the outer portion 164 of the pair of beams 161 constituting the lower beam 165 and the outer portion 174 of the beam 171.
Since the other configuration is the same as that of the above embodiment, detailed description thereof is omitted. Moreover, since the effect is the same as that of the said embodiment, description is abbreviate | omitted.

<Third modification>
Next, a second modification will be described with reference to FIG. As in the first modification, the seismic isolation device 40 is not shown in FIG. 11, but is actually disposed between the diaphragm 160 and the diaphragm 170.

As shown in FIG. 11, in the seismic isolation structure 107 of the second modified example, the upper beam 465 arranged along the X direction includes a pair of beams 460 and 470 arranged in parallel. The beam 460 is formed with bent portions 462 and 472 that are inclined downwardly toward the outer side of the beam 460, respectively.
In plan view, the lower beam 159 disposed along the X direction is disposed between the beam 460 and the beam 470 constituting the upper beam 465. In other words, the lower beam 159 and the beams 460 and 470 are arranged in parallel with a predetermined gap in plan view.

  Further, the portions 464 and 474 outside the bent portions 462 and 472 of the beams 460 and 470 overlap with the lower beam 159 in a side view as viewed in the Y direction. That is, the lower beam 159 is disposed between the outer portion 464 of the pair of beams 460 and the outer portion 474 of the beam 470 constituting the upper beam 465. Since the other configuration is the same as that of the above embodiment, detailed description thereof is omitted.

  Moreover, since the effect is the same as that of the said embodiment, description is abbreviate | omitted. However, in the third modification, a space on the beam of the upper beam 465 can be secured mainly. Therefore, the present invention is applied to the case where securing the effective height K2 on the upper beam has priority over the effective height K1 below the lower beam in FIG.

<Other Modifications (Variations) of First Embodiment>
In addition, the modification (variation) of 1st embodiment is not limited above. Needless to say, the present invention can be implemented in various modes without departing from the scope of the present invention.

For example, both the upper beam and the lower beam may form a bent portion that is bent in a direction approaching each other.
Further, both the upper beam and the lower beam may be formed of a single beam. Alternatively, each of the upper beam and the lower beam may be composed of three or more beams.

  Further, for example, as shown in FIGS. 12B to 12D, the present invention is not applied, that is, the upper beam 140 and the lower beam 142 in which the bent portion is not formed are seen in a plan view. It may be configured to overlap (the upper beam 140 and the lower beam 142 may overlap each other). FIG. 12B is an example in which the upper beam 140 and the lower beam 142 are applied to the beam extending rightward in the X direction with the seismic isolation device 40 as the center. FIG. 12C is an example in which an upper beam 140 and a lower beam 142 are applied to a beam extending in the X direction around the seismic isolation device 40. FIG. 12D is an example in which the upper beam 140 and the lower beam 142 are applied to the beam extending downward in the Y direction around the seismic isolation device 40 in addition to (C).

  In other words, FIG. 12A is an example (first modification) in which a bending portion is formed in a beam in all directions with the seismic isolation device 40 as the center. FIG. 12B is an example in which a bent portion is formed in a beam in three directions around the seismic isolation device 40. FIG. 12C is an example in which a bent portion is formed in a beam in two directions in the Y direction with the seismic isolation device 40 as the center, and FIG. 12D shows the Y direction in the figure with the seismic isolation device 40 as the center. This is an example in which a bent portion is formed only in an upper one-way beam.

  Further, for example, as shown in FIG. 13, the upper beams 132, 134, 136, and 138 may be arranged so as to be shifted from the lower beam 150 and the lower beam 256 by about 45 °. With such a configuration, there is almost no possibility that the upper beams 132, 134, 136, and 138 and the lower beams 150 and 256 are in contact with each other during an earthquake.

  In the present embodiment, the base plate and rubber are alternately laminated in the vertical direction (Z direction), and as a whole, the seismic isolation device 40 has a laminated rubber body 42 formed in a columnar shape having the vertical direction as an axial direction. However, the present invention is not limited to this. Other seismic isolation devices may be used. For example, a seismic isolation device or the like that enables smooth movement with a ball slide rail or the like may be used. In short, it is only necessary to have a mechanism that can be flexibly displaced in the horizontal direction while supporting the upper structure portion 50 in the vertical direction.

  In the present embodiment, the oil damper 60 and the U-shaped metal damper (metal history damper) 46 are used as the damping member, but the present invention is not limited to this. Other dampers may be used. For example, metal dampers other than U-shaped, viscous dampers other than oil dampers, friction dampers, viscoelastic dampers, and the like can also be used. An appropriate damping member may be used as necessary. Further, the damping member is not an essential member. It may be omitted as appropriate.

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment, and the overlapping description is abbreviate | omitted.

  In the first embodiment, the bent portions 152 and 252 of the lower beams 150 and 256 are inclined upward toward the outside (see FIGS. 2 and 9). On the other hand, in this embodiment, as shown in FIG. 14, the bent portion 352 of the lower beam 350 has a vertical column shape that is bent in a substantially vertical direction (Z direction) in a side view. In other words, the lower beam 350 is formed in a step shape in a side view. A portion 354 outside the bent portion 352 in the lower beam 350 is horizontally arranged.

  Further, in a side view as viewed in the Y direction, a portion 354 outside the bent portion 352 of the lower beam 350 overlaps the upper beam 180. That is, the portion 354 outside the bent portion 352 in the lower beam 350 is disposed between the pair of beams 182 and 184 that constitute the upper beam 180. Therefore, the layer thickness of the outer side of the bent portion 352 in the seismic isolation layer 103 is narrow between the bent portion 352 and the bent portion 352 in the present embodiment.

  In the plan view, the gap between the pair of beams 182 and 184 constituting the lower beam 350 and the upper beam 180 is the same as that of the first embodiment.

  Then, the side surface 351 on the X direction inner side (the seismic isolation device 40 side) of the bent portion 352 and the side surface 175 on the outer side in the X direction of the diaphragm 170 (the portion that protrudes most in the horizontal direction toward the bent portion 352) The gaps N1 and N2 are set to be the same as the deformation limit value M of the seismic isolation device 40 or slightly larger than the deformation limit value M. In the present embodiment, N1 = N2 is set. Therefore, hereinafter, when it is not necessary to distinguish between these, it will be described as a gap N1.

Next, the operation of this embodiment will be described.
As described above, the gap N1 between the side surface 351 of the bent portion 352 of the lower beam 350 and the side surface 175 of the diaphragm 170 is the same as the deformation limit value M of the seismic isolation device 40 or slightly smaller than the deformation limit value M. It is set large. Therefore, even during the L2 earthquake, the side surface 351 of the bent portion 352 of the lower beam 350 and the side surface 175 of the diaphragm 170 do not contact each other. That is, the seismic isolation performance of the seismic isolation device 40 is exhibited to the maximum even during the L2 earthquake.

However, when a large shake exceeding the L2 earthquake occurs, the seismic isolation device 40 is excessively deformed by the deformation limit value M or more.
In such a case, as shown in FIG. 15, the seismic isolation device 40 has N1 (deformation limit value) in the longitudinal direction (X direction in the present embodiment) of the lower beam 350 in which the bent portion 352 is formed. When the base column 20 and the upper column 30 are relatively moved, the side surface 175 of the diaphragm 170 hits the side surface 351 of the bent portion 352 of the lower beam 350 and further movement is prevented. . That is, the seismic isolation device 40 is prevented from being excessively deformed by N1 or more. That is, the gap (distance) N1 between the side surface 351 of the bent portion 352 of the lower beam 350 and the side surface 175 of the diaphragm 170 is the maximum amount of deformation in the X direction. The gap N1 is set to a maximum deformation amount that ensures safety even if the seismic isolation device 40 is excessively deformed.

  Thus, the diaphragm 170 and the bent portion 352 of the lower beam 350 have a stopper function that prevents excessive deformation of the seismic isolation device 40 (ensures safety).

As shown in FIG. 16, an impact buffering member (energy absorbing material) 186 that cushions an impact at the time of contact may be provided on the side surface 351 of the bent portion 352 of the lower beam 350. That is, the side surface 175 of the diaphragm 170 and the side surface 351 of the bent portion 352 of the lower beam 350 may be in contact with each other via the shock absorbing member 186.
Moreover, in FIG. 16, although it is the structure by which the shock-absorbing member 186 was joined to the side surface 351 of the bending part 352, it is not limited to this. An impact buffer member 186 may be joined to the side surface 175 of the diaphragm 170. Further, the shock absorbing member 186 may be joined to both the side surface 351 of the bent portion 352 and the side surface 175 of the diaphragm 170.

  In the present embodiment, the side surface 175 of the diaphragm 170 hits the side surface 351 of the bent portion 352 of the lower beam 350, but the present invention is not limited to this. It is good also as a structure where the site | part most protruded in the horizontal direction which goes to the bending part 352 in the seismic isolation apparatus 40 hits the bending part 352. FIG. For example, when the flange plate 44 of the seismic isolation device 40 is configured to protrude toward the bent portion 352 from the side surface 175 of the diaphragm 170, the flange plate 44 is formed on the side surface 351 of the bent portion 352 of the lower beam 350. It is good also as a structure which hits.

In the case where the bent portion is formed on the upper beam, the side surface of the lower diaphragm 160 is in contact with the side surface of the bent portion.
In addition, a vertical column-shaped bent portion bent in a substantially vertical direction (Z direction) in a side view is formed on the lower beam along the Y direction, and has a stopper function in the direction along the Y direction. It is good.

In this embodiment, as in the first embodiment, the stopper mechanism is applied to prevent excessive deformation exceeding the deformation limit value M of the seismic isolation device 40, but the present invention is not limited to this. For example, a stopper mechanism may be applied in order to ensure a required clearance in terms of design specifications.
In other words, the predetermined gap, that is, the horizontal relative movement amount between the upper column 30 and the foundation column 20 is set by the limit deformation amount of the seismic isolation device 40 (preventing excessive deformation of the seismic isolation device 40). However, it is not limited to this. The upper column 30 and the foundation column 20 may be determined according to design specifications or the like that allow relative movement.

<Third embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment and 2nd embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 17 and FIG. 18, the bent portion 552 of the lower beam 500 arranged along the X direction has a semicircular shape (U-shape) arranged in a downwardly convex manner in a side view seen in the Y direction. Shape). In other words, the upper concave curved surface 558 is formed on the upper surface of the bent portion 552 of the lower beam 550 extending from the foundation column 20 to both sides. Also, ribs 556 are formed on the sides of the upper surface of the lower beam 550.

Further, in a side view as viewed in the Y direction, a portion 554 outside the bent portion 552 of the lower beam 500 overlaps with the upper beam 180. That is, the portion 554 outside the bent portion 552 in the lower beam 500 is disposed between the pair of beams 182 and 184 that constitute the upper beam 180.
Further, the curved surface 558 constituting the upper surface of the bent portion 552 of the lower beam 550 is a smooth surface having a small sliding resistance made of fluororesin or stainless steel.

  Note that the lower end portion (vertical portion of the semicircle) of the bent portion 552 of the lower beam 500 is fixed to the upper portion of the foundation column 20 by the fixing member 26.

A support portion 520 that protrudes downward is provided on the lower surface of the diaphragm 160 immediately below the upper column 30. A hemispherical ball seat 522 is formed at the distal end (lower end) of the support portion 520.
In addition, the axis of the upper column 30, the axis of the ball seat 522 (supporting part 520), and the axis of the foundation column 20 are arranged on the same axis G passing through the bottom (origin) of the curved surface 558.
The ball seat 522 of the support portion 520 is movable along the X direction (longitudinal direction of the lower beam 550) on the curved surface 558 of the bent portion 552.

That is, the seismic isolation device 48 according to the present embodiment mainly includes the curved surface 558 provided in the support portion 520 and the bent portion 522.
Although omitted in FIGS. 17 and 18, a lower beam arranged along the Y direction is also provided in this embodiment.

Next, the operation of this embodiment will be described.
As shown in FIG. 18, normally, the ball seat 522 of the support portion 520 is supported on the bottom (origin) of the curved surface 558 on the upper surface of the bent portion 552 of the lower beam 500 (the axial center of the upper column 30). The axial center of the ball seat 522 (supporting part 520) and the axial center of the foundation pillar 20 are arranged on the same axis G).

However, during an earthquake, the ball seat 522 slides in the X direction along the curved surface 558, and the seismic isolation function is exhibited (see arrow W in FIG. 18).
In addition, after the earthquake, the ball seat 522 of the support portion 520 returns to the bottom (origin) of the curved surface 558. In other words, the support portion 520 has an origin return function for returning to the origin.
In this way, by using the bent portion 552 of the lower beam 500, a seismic isolation device having a function of returning to the origin is realized in a space-saving manner.

  Note that the tip of the support portion 520 may have a shape other than the ball seat 522. The cross section may be U-shaped. Furthermore, a ball member provided to roll on the curved surface 558 may be used. In the case of a ball member, it is not necessary to form a smooth surface on the curved surface 558. Moreover, you may form in the support part 520 side the sliding surface with small sliding resistance comprised with the fluororesin, stainless steel, etc.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment-3rd embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIGS. 19 and 20, the lower beam 600 disposed along the Y direction also has a bent portion 652 that is curved in a semicircular shape (U-shape) in a side view as viewed in the X direction. Is provided. Further, in a side view as viewed in the X direction, a portion 654 outside the bent portion 652 of the lower beam 600 overlaps with the upper beam 280. In other words, the portion 654 outside the bent portion 652 in the lower beam 600 is disposed between the pair of beams 282 and 284 constituting the upper beam 280.

And the receiving part 650 in which the recessed part 656 in which the center part was recessed hemispherically was joined to the upper surface of the bending part 552 of the lower beam 500, and the bending part 652 of the lower beam 600.
A curved surface 658 constituting the upper surface of the recess 656 of the receiving portion 650 is a smooth surface having a small sliding resistance and made of fluororesin, stainless steel or the like.
Moreover, the receiving part 650 has a function as a diaphragm.

A support portion 520 having a hemispherical ball seat 522 that protrudes downward is provided on the lower surface of the diaphragm 160 directly below the upper column 30. The axis of the upper column 30, the axis of the ball seat 522 (supporting part 520), and the axis of the foundation column 20 are arranged on the same axis G passing through the bottom (origin) of the curved surface 558.
The ball seat 522 of the support portion 520 can move on the curved surface 658 of the receiving portion 650.
That is, the seismic isolation device 49 according to the present embodiment mainly includes the support portion 520 and the curved surface 658 of the receiving portion 650.

Next, the operation of this embodiment will be described.
As shown in FIG. 20, normally, the ball seat 522 of the support portion 520 is supported on the bottom (origin) of the curved surface 558 of the receiving portion 650 (the axis of the upper column 30, the ball seat 522 (the support portion). 520) and the axis of the foundation column 20 are arranged on the same axis G).

However, during an earthquake, the ball seat 522 slides along the curved surface 658 and the support portion 520 moves, thereby exhibiting a seismic isolation function.
In addition, after the earthquake, the ball seat 522 of the support portion 520 returns to the bottom (origin) of the curved surface 658. In other words, the support portion 520 has an origin return function for returning to the origin.
As described above, by using the bent portions 552 and 652 of the lower beams 500 and 600, the seismic isolation device having the origin return function is realized in a space-saving manner.
In the present embodiment, the seismic isolation device 49 has a seismic isolation function with respect to all the horizontal directions (XY plane directions) in plan view.

  Further, the support portion 520 may have a shape other than the ball seat 522 at the tip portion. For example, a ball member provided to roll on the curved surface 658 may be used. In the case of a ball member, it is not necessary to form a smooth surface on the curved surface 658. Moreover, you may form the smooth surface with small sliding resistance comprised with the fluororesin, stainless steel, etc. in the support part 520 side.

<Application examples to other structures>
So far, the example which applied the seismic isolation structure which concerns on embodiment of this invention to the railway station 10 was demonstrated. However, the seismic isolation structure according to the embodiment of the present invention can also be applied to structures other than the railway station 10. Therefore, next, an example in which the seismic isolation structure according to the embodiment of the present invention is applied to a building will be described.
In the following example, an example in which the seismic isolation structure 100 according to the first embodiment is applied will be described, but other embodiments and modifications can be applied. Moreover, the same code | symbol is attached | subjected to the member same as the said embodiment, and the overlapping description is abbreviate | omitted. In addition, the same member does not necessarily indicate the completely same member, but the substantially same member is also the same member.

<First application example to buildings>
FIG. 21 shows a building 800 having an intermediate seismic isolation structure to which the seismic isolation structure of the present invention is applied and which has been seismically isolated. As shown in FIG. 21, the building 800 is supported by a pile foundation 802 provided in the ground. In the building 800, a seismic isolation layer 102 is provided between an upper structure portion (upper floor) 810 and a lower structure portion (lower floor) 820.

  As shown in FIG. 11, pipes, stairs, elevators, etc. that pass vertically through the seismic isolation layer 102 follow even if the upper structure portion 810 and the lower structure portion 820 are relatively horizontally displaced during the earthquake. It has a mechanism to do. In addition, since such a follow-up mechanism can apply the mechanism currently applied with the structure which has the existing intermediate seismic isolation layer, detailed description is abbreviate | omitted.

A diaphragm 160 is provided below the lower column 822 constituting the structural member of the lower structure portion 820, and a diaphragm 170 is provided below the upper column 812 constituting the structural member of the upper structure portion 810.
21 shows a state in which the upper structure portion 810 and the lower structure portion 820 are relatively horizontally displaced at the time of the earthquake, the lower column 822 and the upper column 812 are not shown coaxially. Normally, the lower column 822 and the upper column 812 are provided coaxially.

  A seismic isolation device 40 is provided below the lower column 822 between the diaphragm 160 and the diaphragm 170 of the upper column 812. And the bending part 152 is formed in the lower beam 150 similarly to the said embodiment. In addition, since the structure of the seismic isolation structure 100 is substantially the same structure as 1st embodiment (refer FIG. 2 etc.), detailed description is abbreviate | omitted.

Next, the operation of this application example will be described.
Similar to the first embodiment, while suppressing an increase in the overall height of the building 800 (or without increasing the height), the column section of the lower column 822 is increased and the lower portion of the lower beam 150 below the beam. The effective height under the beam of the lower beam 150 (more precisely, the effective height under the beam of the portion 154 outside the lower beam 150) is ensured without reducing the effective area of the space. Also, the effective height (floor height) of the upper beam 180 on the beam is secured. That is, the floor height and the column cross-sectional area (floor area) are ensured.

  Further, as described above, since the beam and the bent portion also serve as a stopper mechanism, it is not necessary to provide a separate stopper mechanism, so that cost reduction and space saving are realized as compared with the case where a separate stopper mechanism is provided. The

  In addition, the stopper mechanism may be determined by a required clearance in design specifications, for example, a specification of a tracking limit value in a tracking mechanism such as a pipe, a staircase, and an elevator that passes above and below the seismic isolation layer 102 described above. Good.

<Second application example to buildings>
FIG. 22 shows a building 850 having a basic seismic isolation structure to which the seismic isolation structure of the present invention is applied.

  As shown in FIG. 22, a seismic isolation pit 862 is provided in a ground recess 860 formed by excavating the ground E. The seismic isolation pit 862 has a reinforced concrete foundation bottom (not shown) formed at the bottom of the ground recess 860. A base bottom plate (not shown) supports the building 850. Further, the foundation bottom 864 is supported by a pile foundation 803. Note that the pile foundation 803 may be omitted if the ground can support the building load transmitted from the foundation bottom (not shown).

A seismic isolation device 40 is provided on the foundation bottom. The seismic isolation device 40 is installed on a seismic isolation rack 856 provided directly above the pile foundation 803.
A base isolation frame 858 is provided on the base isolation device 40, and a building 850 is provided on the base isolation frame 858. A column 870 as a structural member of the building 850 is provided immediately above the base isolation frame 858.

  FIG. 22 schematically illustrates a state in which the building 850 is horizontally displaced during an earthquake. Therefore, although the pillar 870 and the pile foundation 803 are not shown on the same axis, the pillar 870, the pile foundation 803, and the seismic isolation device 40 are usually provided on the same axis.

  The lower beam (foundation beam) 150 is joined to the lower base isolation frame 856, and the upper beam 180 (see beams 182 and 184, see FIG. 2) is joined to the upper base isolation frame 858. A bent portion 152 is formed in the lower beam 150. In addition, since the structure of the seismic isolation structure 100 is substantially the same structure as 1st embodiment (refer FIG. 2 etc.), detailed description is abbreviate | omitted.

  In this application example, it is not necessary to excavate the ground convex portion 866 between the bent portion 152 and the bent portion 152 in the lower beam (foundation beam) 150. Therefore, when excavating the ground E, the excavation amount of the ground convex portion 866 is reduced.

Further, since the upper beams 150 and 250 and the lower beams 180 and 280 are arranged so as to be shifted in a plan view, the maintenance of the seismic isolation device 40 can be easily performed as compared with the case where the upper beam and the lower beam overlap each other. Can be done.
In addition, since the upper beams 150 and 250 and the lower beams 180 and 280 are shifted from each other in plan view, the upper beams 150 and 250 (building 850) are compared with the case where the upper beam and the lower beam overlap each other. It is easy to jack up (see FIG. 2 etc. for the upper beam 180 and the lower beam 280).

<Others>
In addition, this invention is not limited to the said embodiment, a modification, and an application example. Needless to say, the present invention can be implemented in various modes without departing from the scope of the present invention.

  For example, the present invention can be applied not only to the seismic isolation repair of an existing structure but also to a new structure.

  In addition, the present invention can be applied regardless of the structural type such as steel structure, reinforced concrete structure, steel reinforced concrete structure, CFT structure, and the sectional shape of the member.

10 Seismic isolation structure (railway station)
16 Line 40 Seismic isolation device 48 Seismic isolation device 49 Seismic isolation device 60 Oil damper (damping member)
100 Base-isolated structure 104 Base-isolated structure 105 Base-isolated structure 107 Base-isolated structure 132 Upper beam 150 Lower beam 152 Bent part 159 Lower beam 160 Diaphragm (lower support part)
161 Beam (lower beam)
162 Bending part 165 Lower beam 170 Diaphragm (upper support part)
171 Lower beam 180 Upper beam 182 Beam (upper beam)
184 Beam (upper beam)
186 Shock absorbing member 190 Upper beam 250 Lower beam 252 Bending portion 256 Lower beam 280 Upper beam 282 Beam (upper beam)
284 Beam (upper beam)
350 Lower beam 352 Bending part 460 Beam (upper beam)
462 Bending part 465 Upper beam 470 Beam (upper beam)
472 bent portion 500 lower beam 520 support portion 522 bent portion 550 lower beam 552 bent portion 558 curved surface 600 lower beam 652 bent portion 658 curved surface 800 building (base-isolated structure)
850 building (base-isolated structure)
856 Base Isolated (Lower Support)
858 Base Isolated (Upper Support)

Claims (10)

A seismic isolation device provided between the upper support and the lower support;
An upper beam joined to the upper support,
A lower beam joined to the lower support part and arranged in parallel with the upper beam in a plan view;
A bent portion formed on at least one of the upper beam and the lower beam, and bent in a direction approaching the other beam in a side view;
Seismic isolation structure with The direction away from the seismic isolation device in plan view is the outside,
2. The seismic isolation structure according to claim 1, wherein the upper beam and the lower beam overlap each other at least partially outside the bent portion in a side view. When the lower support part and the upper support part move larger than a predetermined relative movement amount in a direction in which a gap between the lower beam and the upper beam is narrowed,
The seismic isolation structure according to claim 2, wherein a gap between the upper beam and the lower beam is set so that the upper beam and the lower beam are in contact with each other or in contact with each other through a shock absorber. When the lower support part and the upper support part move in a longitudinal direction of the beam in which the bent part is formed to be larger than a predetermined relative movement amount,
The lower support part, the upper support part, and the seismic isolation so that any one of the lower support part, the upper support part, and the seismic isolation device and the bent part are in contact with each other or through a shock absorber. The seismic isolation structure according to any one of claims 1 to 3, wherein a gap between any one of the devices and the bent portion is set. The bent portion is formed at least on the lower beam, and an upper concave curved surface is provided on the upper surface or the upper side of the bent portion of the lower beam extending from the lower support portion to both sides,
The seismic isolation device is
The curved surface provided above or above the bent portion; and
A support portion provided at a lower end portion of the upper support portion, supported by the curved surface and movable along the curved surface;
Having
The seismic isolation structure according to any one of claims 1 to 4.   The seismic isolation structure according to claim 5, wherein the curved surface is configured in a substantially hemispherical shape. A damping member that attenuates relative movement between the upper support and the lower support,
The base isolation structure according to any one of claims 1 to 6, wherein the base isolation structure is connected to the upper beam and the lower beam. Either one of the upper beam and the lower beam is composed of two beams arranged in parallel in a plan view,
One of the upper beam and the lower beam is arranged between the two beams arranged in parallel in a plan view.
The seismic isolation structure according to any one of claims 1 to 7.   A base-isolated structure comprising the base-isolated structure according to any one of claims 1 to 8. Applied to structures over the track,
The seismic isolation structure according to claim 9, wherein the bent portion is formed at least on the lower beam, and the lower beam on which the bent portion is formed is disposed along a direction intersecting the track. .

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