JP5481365B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device.

Conventionally, an upper end plate fixed to the upper structure, a lower end plate fixed to the lower structure, and a reinforcing plate and a rubber plate are alternately stacked in the vertical direction while being disposed between both end plates. A seismic isolation device is known that includes a laminated body that is formed so as to be capable of shear deformation in the horizontal direction, and a damping plug that is disposed in a mounting hole that is formed in the laminated body and extends in the vertical direction.
In this type of seismic isolation device, when the laminate is subjected to shear deformation, the damping plug bites into the exposed soft part of the rubber plate on the inner peripheral surface of the mounting hole, and presses against the exposed hard part of the reinforcing plate. As a result, the rubber plate and the damping plug may be damaged.
As means for solving such a problem, for example, Patent Document 1 below discloses a configuration in which a coil spring is embedded in a rubber layer around a damping plug.

JP-A-10-176308

  However, the conventional seismic isolation device has room for improvement in suppressing damage to the rubber plate and the damping plug.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a seismic isolation device capable of reliably exhibiting the expected damping performance by suppressing damage to a rubber plate and a damping plug. To do.

  In order to solve the above problems and achieve such an object, the seismic isolation device of the present invention includes an upper end plate fixed to the upper structure, a lower end plate fixed to the lower structure, and both ends thereof. A laminate that is disposed between the plates, and in which the reinforcing plates and the rubber plates are alternately stacked in the vertical direction so as to be capable of shear deformation in the horizontal direction, and the mounting formed in the laminate that extends in the vertical direction A seismic isolation device including a damping plug disposed in the hole, and a plurality of protective rings that are externally fitted to the damping plug in a vertically stacked state are disposed in the mounting hole. The protective ring protrudes outward in the radial direction, and is not in contact with the exposed soft part of the rubber plate and is exposed to the exposed hard part of the reinforcing plate, of the inner peripheral surface of the mounting hole. It is characterized in that a support protrusion that abuts is formed.

According to the present invention, the protective ring externally fitted to the damping plug is not in contact with the exposed soft part of the rubber plate and is in contact with the exposed hard part of the reinforcing plate, of the inner peripheral surface of the mounting hole. Since the protrusion is formed, the load applied to the rubber plate from the protective ring can be surely suppressed while the damping plug exhibits the damping performance at the time of shear deformation of the laminate.
In addition, since a plurality of protection rings are externally fitted to the damping plug in a state of being stacked in the vertical direction, when the laminated body is subjected to shear deformation, the adjacent protection rings in the vertical direction are brought into sliding contact with each other. By displacing it, it becomes possible to suppress the formation of a gap between them, and the attenuation plug is exposed to the outside from between the protective rings adjacent in the vertical direction and presses against the inner peripheral surface of the mounting hole. Can be prevented.

  Here, the support protrusion gradually increases in diameter as it goes inward from both ends of the protection ring in the vertical direction, and is formed in a curved surface shape protruding outward in the radial direction. An outermost end portion may contact the hard portion of the inner peripheral surface of the mounting hole.

In this case, since the support protrusion is gradually enlarged in diameter as it goes inward from both ends in the vertical direction of the protective ring, the soft part of the inner peripheral surface of the mounting hole is protected from the protective ring when the laminate is shear-deformed. It is possible to make it difficult to make point contact with the support protrusions and to make surface contact easily.
Further, the support protrusion is formed in a curved surface shape, and the radially outermost end portion of the support protrusion is in contact with the hard portion of the inner peripheral surface of the mounting hole. It is possible to easily suppress the contact portion with respect to the peripheral surface to the minimum necessary, and it is possible to reliably suppress the support protrusion from contacting the soft portion of the inner peripheral surface of the mounting hole.
In addition, since the support protrusion is formed in a protruding curved shape as described above, even if the soft portion of the inner peripheral surface of the mounting hole comes into contact with the support protrusion when the laminated body undergoes shear deformation, the soft protrusion It is possible to make it difficult to apply a load to the portion.

  Further, the both end plates are formed with end holes penetrating in the vertical direction and communicating with the mounting holes, and caps for closing the end holes are separately mounted, and a plurality of the protective rings Between the protective ring located at the outer end in the vertical direction and the cap, a buffer member that is sandwiched in the vertical direction by the cap and the protective ring and elastically deformed may be disposed.

  In this case, since the buffer member is disposed between the cap and the protective ring, the axial force applied to the protective ring can be suppressed, and the durability of the protective ring can be ensured.

  According to the seismic isolation device of the present invention, it is possible to reliably exhibit the expected damping performance by suppressing damage to the rubber plate and the damping plug.

It is the schematic of the seismic isolation apparatus shown as one Embodiment which concerns on this invention.

Hereinafter, an embodiment of the seismic isolation device according to the present invention will be described with reference to FIG.
The seismic isolation device 1 according to this embodiment includes an upper end plate 12 fixed to an upper structure 11 such as a building body, a lower end plate 14 fixed to a lower structure 13 such as a foundation, and both end plates 12 and 14. And a laminated body 17 in which the reinforcing plates 15 and the rubber plates 16 are alternately laminated in the vertical direction so as to be shearable in the horizontal direction, and in the vertical direction formed in the laminated body 17. And an attenuation plug 28 disposed in the extending mounting hole 18.
The seismic isolation device 1 is disposed between the lower structure 13 and the upper structure 11 and supports the upper structure 11 so as to be horizontally movable with respect to the lower structure 13.

  Here, the both end plates 12 and 14 are each formed into a disk-like body, and the laminated body 17 is a cylindrical body, and these 12, 14 and 17 are arranged coaxially with a common axis extending along the vertical direction. ing. Hereinafter, this common axis is referred to as an axis O, a direction orthogonal to the axis O in the horizontal direction is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.

  The both end plates 12 and 14 are formed with end holes 19 and 20 penetrating in the vertical direction and communicating with the mounting holes 18 of the laminated body 17, and a cap 21 for closing the end holes 19 and 20. It is installed separately. Each cap 21 is fitted in the end holes 19 and 20, and bolts 22 penetrating the cap 21 in the vertical direction are fastened and fixed to the both end plates 12 and 14 respectively. The mounting hole 18 and the end holes 19 and 20 are positioned coaxially with the axis O.

The both end plates 12 and 14 are each formed of, for example, a metal material or a hard resin material. The both end plates 12 and 14 are disposed at both ends of the stacked body 17 in the vertical direction.
The laminated body 17 includes a covering rubber 23 that integrally covers the reinforcing plates 15 and the rubber plates 16 alternately laminated in the vertical direction from the outside in the radial direction. The rubber plate 16 and the covering rubber 23 are integrally formed vulcanized rubber and are vulcanized and bonded to the plurality of reinforcing plates 15. The reinforcing plate 15 is made of, for example, a metal material or a hard resin material.

In the present embodiment, a protective ring 24 that is externally fitted to the attenuation plug 28 is disposed in the mounting hole 18 so as to be stacked in the vertical direction.
The protection ring 24 is formed in a thick annular shape in the radial direction, and is stacked in the vertical direction by the vertical end surfaces 24a of the protection rings 24 adjacent in the vertical direction coming into contact with each other. Furthermore, the vertical size of the protective ring 24 is such that each of the one reinforcing plate 15 and one rubber plate 16 in a state where the seismic isolation device 1 is installed between the upper structure 11 and the lower structure 13. It is equivalent to the sum of the vertical sizes.

  The protective ring 24 is formed of, for example, a metal material or a hard resin material. Further, the end surface 24a of the protection ring 24 is an annular flat surface extending along the horizontal direction. The size in the radial direction of the end face 24a of the protection ring 24 is larger than the assumed maximum displacement amount along the horizontal direction of the laminate 17 mainly determined by the material of the rubber plate 16. As a result, when the laminated body 17 undergoes shear deformation, for example, the attenuation plug 28 is exposed to the outside from the protective ring 24, or the protective rings 24 adjacent in the vertical direction are caught with each other, and are displaced without being restored. It can be prevented from being held as it is.

  Further, in the present embodiment, the protective ring 24 protrudes outward in the radial direction, is not in contact with the exposed soft portion 18a of the rubber plate 16 in the inner peripheral surface of the mounting hole 18, and the reinforcing plate 15 A support protrusion 24b is formed in contact with the exposed hard portion 18b. In the illustrated example, the support protrusions 24b are gradually enlarged in diameter from the both ends of the protective ring 24 in the vertical direction toward the inner side, and are formed in a curved surface shape protruding toward the outer side in the radial direction. Then, the radially outermost end portion of the support protrusion 24 b comes into contact with the hard portion 18 b on the inner peripheral surface of the mounting hole 18. Note that the support protrusion 24 b extends continuously on the outer peripheral surface of the protective ring 24 over the entire circumference.

Here, in this embodiment, the plurality of protection rings 24 are sandwiched by the caps 21 from both sides in the vertical direction and supported from the outside in the vertical direction.
In the illustrated example, among the plurality of protection rings 24, a protection ring (hereinafter referred to as an end protection ring) 24 positioned at the outer end in the vertical direction and the cap 21 are disposed on the end surface 24 a of the end protection ring 24. The disc-shaped lid plate 25 placed on the vertical side, the cylindrical plug body 26 placed on the vertical outer end surface 28a of the damping plug 28, the lid plate 25 and the cap 21, and both sides in the vertical direction. And a shock-absorbing member 27 which is sandwiched from and elastically deformed.

The cover plate 25 and the plug 26 are each formed of, for example, a metal material or a hard resin material.
Here, the vertical size of the damping plug 28 is smaller than the overall vertical size of the plurality of protection rings 24, and each vertical outer end surface 28 a of the damping plug 28 is formed on the end protection ring 24. It is located on the inner side in the vertical direction from the end face 24a.

The plug body 26 is fitted into the end protection ring 24, and the surface of the plug body 26 protrudes slightly outward from the end surface 24 a of the end protection ring 24 in the vertical direction and is in contact with the lid plate 25.
The buffer member 27 is formed in a disc shape with vulcanized rubber, and the outer diameter of the buffer member 27 is the state before the seismic isolation device 1 is installed between the upper structure 11 and the lower structure 13. 12 and 14 are smaller than the inner diameters of the end holes 19 and 20 formed in them. As a result, when the buffer member 27 is sandwiched in the vertical direction by the cap 21, the end protection ring 24 and the cover plate 25, it can be elastically deformed reliably.

As explained above, according to the seismic isolation device 1 according to the present embodiment, the soft part 18a where the rubber plate 16 is exposed, of the inner peripheral surface of the mounting hole 18, is attached to the protective ring 24 fitted to the damping plug 28. Since the support protrusion 24b is formed in contact with the exposed hard portion 18b of the reinforcing plate 15, the protection ring 24 is provided with the damping plug 28 exhibiting damping performance when the laminated body 17 is sheared. Therefore, the load applied to the rubber plate 16 can be reliably suppressed.
Further, since the protection ring 24 is externally fitted to the attenuation plug 28 in a state where a plurality of the protection rings 24 are stacked in the vertical direction, when the laminated body 17 is shear-deformed, the protection rings 24 adjacent in the vertical direction are connected to the end faces 24a. Displacement while being in sliding contact makes it possible to suppress the formation of a gap between the two, and the damping plug 28 is exposed to the outside from between the adjacent protective rings 24 in the vertical direction, and the mounting hole 18 It is possible to prevent pressure contact with the inner peripheral surface of the.

Further, since the support protrusions 24b are gradually enlarged in diameter from the both ends in the vertical direction of the protective ring 24, the soft portion 18a on the inner peripheral surface of the mounting hole 18 when the laminated body 17 undergoes shear deformation. Can be made difficult to make point contact with the support protrusions 24b of the protective ring 24, making it easier to make surface contact.
Further, the support protrusion 24b is formed in a curved shape, and the radially outermost end portion of the support protrusion 24b abuts on the hard portion 18b of the inner peripheral surface of the mounting hole 18, so that the support protrusion 24b Thus, it is possible to easily reduce the contact portion of the mounting hole 18 with respect to the inner peripheral surface to the minimum necessary, and it is ensured that the support protrusion 24b contacts the soft portion 18a of the inner peripheral surface of the mounting hole 18. Can be suppressed.
Further, as described above, since the support protrusion 24b is formed in the curved shape of the protrusion, the soft portion 18a on the inner peripheral surface of the mounting hole 18 abuts on the support protrusion 24b when the laminated body 17 undergoes shear deformation. However, it is possible to make it difficult to apply a load to the soft portion 18a.

  Further, since the buffer member 27 is disposed between the cap 21 and the protective ring 24, it is possible to suppress the axial force applied to the protective ring 24, and to ensure the durability of the protective ring 24. it can.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the support protrusion 24b is configured to continuously extend over the entire outer periphery of the protective ring 24. However, the present invention is not limited thereto, and the support protrusion 24b is intermittently extended or dotted in the circumferential direction. Etc. may be appropriately changed.
Further, the support protrusion 24b may be disposed on the outer peripheral surface of the protective ring 24 at a position away from the outer end in the vertical direction, or may be appropriately changed, for example, formed in a polygonal shape in a longitudinal section. .
Further, the buffer member 27 may be disposed only in one of the end holes 19 and 20 formed in the both end plates 12 and 14, or may not be disposed in both.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.

  It is possible to reliably exhibit the expected damping performance by suppressing damage to the rubber plate and damping plug.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 11 Upper structure 12 Upper end plate 13 Lower structure 14 Lower end plate 15 Reinforcement plate 16 Rubber plate 17 Laminated body 18 Mounting hole 18a Soft part 18b Hard part 19, 20 End hole 21 Cap 24 Protective ring 24b Support protrusion 27 Cushioning member 28 Damping plug

Claims (3)

An upper end plate fixed to the upper structure;
A lower end plate fixed to the lower structure;
While being disposed between these both end plates, a laminate in which reinforcing plates and rubber plates are alternately laminated in the vertical direction so as to be shearable in the horizontal direction,
A damping plug disposed in a vertically extending mounting hole formed in the laminate;
A seismic isolation device comprising:
In the mounting hole, a protective ring externally fitted to the damping plug in a state of being stacked in the vertical direction is disposed,
The protective ring protrudes outward in the radial direction, and is not in contact with the exposed soft part of the rubber plate and contacts the exposed hard part of the reinforcing plate, of the inner peripheral surface of the mounting hole. A seismic isolation device, characterized in that a supporting protrusion is formed in contact therewith. The seismic isolation device according to claim 1,
The support protrusion is gradually enlarged in diameter as it goes inward from both ends in the vertical direction of the protective ring, and is formed in a curved surface shape protruding outward in the radial direction, and the radially outermost end of the support protrusion A part is in contact with the hard part of the inner peripheral surface of the mounting hole. The seismic isolation device according to claim 1 or 2,
The both end plates are formed with end holes that penetrate in the vertical direction and communicate with the mounting holes, and caps that close these end holes are mounted separately,
A buffer member that is sandwiched in the vertical direction by these caps and the protective ring and elastically deformed is arranged between the protective ring located at the outer end in the vertical direction and the cap among the plurality of protective rings. Seismic isolation device characterized by being installed.

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