JP6301432B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device that is provided between a building side such as a general house, a condominium, and an office building and the ground side and absorbs shaking of an earthquake transmitted from the ground side to the building side.

  In recent years, for example, buildings such as ordinary houses, condominiums, office buildings, and the like have increased in structure with high earthquake resistance strength in order to prevent the collapse of buildings due to an earthquake. However, even if the building can be prevented from collapsing, if the earthquake is severely swayed, the indoor furniture may fall over or the equipment may be scattered, causing damage to the outside of the room. Therefore, a seismic isolation device is provided between the building side and the ground side so that the seismic roll transmitted from the ground side to the building side is absorbed by the seismic isolation device (for example, Patent Document 1). reference.). This seismic isolation device is formed by laminating a plurality of metal plates and rubber so as to absorb the rolling due to the earthquake by the elasticity of rubber.

JP 2007-205492 A

  By the way, when a seismic isolation device is used, a return spring that applies horizontal tension to the building side of the seismic isolation device in order to return the building that has been displaced due to the rolling motion to its original position after the shaking of the earthquake has ceased. It is necessary to provide. However, in this case, there is a problem that the installation space for the return spring is required outside the seismic isolation device, which makes it difficult to install under a narrow floor.

  In addition, since the seismic isolation device has a metal plate and rubber laminated in the vertical direction, there is a problem that the height dimension becomes large and it is difficult to install in a building with a small space in the vertical direction under the floor. there were.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is not to separately install a spring for returning the seismic isolation object to its original position, and in the vertical direction. The object is to provide a seismic isolation device that can be miniaturized.

In order to achieve the above-mentioned object, the present invention comprises an apparatus main body fixed to the ground side, and a movable body arranged in the apparatus main body so as to be movable in the horizontal direction and fixed to the seismic isolation object side. In the seismic isolation device that absorbs the shaking from the ground side to the seismic isolation object side by moving the movable body in the horizontal direction relative to the apparatus main body, the movable body includes a plurality of cylinders extending radially in the horizontal direction; And a plurality of pistons movable in the horizontal direction in each cylinder, and a spring for urging each piston toward the outer side in the horizontal direction of the movable body. A bottom surface portion that is movably disposed and a contact portion with which a piston of a movable body that moves in the horizontal direction abuts are provided, and the piston moves against the biasing means by contact with the contact portion of the apparatus main body. Toward the inside of the body in the horizontal direction Together configured to move I, the piston when moved toward the cylinder to the inside of the movable body, the movable body lubricant filled in the cylinder is pushed out from the cylinder to the outside of the movable member by a piston It is supplied between the lower surface and the bottom surface of the apparatus main body, and when the piston moves toward the inside of the apparatus main body by the biasing means, lubricating oil outside the movable body is sucked into the cylinder by the piston. Yes.

As a result, the movable body is returned to the center side of the apparatus main body by the restoring force of the spring provided on the movable body. Therefore, a spring for returning the seismic isolation object to the original position is separately provided outside the apparatus main body. There is no need. In this case, since the piston provided on the movable body moves in the horizontal direction, the entire apparatus does not increase in size in the vertical direction. In addition, since the plurality of pistons are respectively provided in the plurality of cylinders extending radially in the horizontal direction, any piston moves against the apparatus main body in any direction in the horizontal direction. Abuts the contact. Further, when the piston moves in the cylinder toward the inside of the movable body, the lubricating oil filled in the cylinder is pushed out of the cylinder by the piston to the outside of the movable body, and the bottom surface of the movable body and the bottom surface portion of the apparatus main body. When the piston moves toward the inside of the apparatus main body 10 by the spring, lubricating oil outside the movable body is sucked into the cylinder by the piston, so that the lower surface of the movable body and the bottom surface of the apparatus main body Lubricant is supplied while flowing along with the shaking of the earthquake.

According to the present invention, since it is not necessary to separately provide a spring for returning the seismic isolation object to the original position outside the apparatus main body, it is extremely advantageous when the installation space under the floor is small, and the entire apparatus is Since it can be downsized in the vertical direction, it is advantageous even when there is little space in the height direction under the floor. In addition, even if the movable body moves in any direction in the horizontal direction with respect to the apparatus main body, any of the pistons can be brought into contact with the contact portion of the apparatus main body. It can be returned to its original position by moving in any direction. Further, since the lubricating oil can be supplied between the lower surface of the movable body and the bottom surface portion 11 of the apparatus main body while flowing the earthquake, the lower surface of the movable body and the apparatus main body due to the load of the seismic isolation object The sliding resistance with respect to the bottom surface portion can be effectively reduced by the lubricating oil, and the movable body can always be smoothly moved on the bottom surface portion of the apparatus main body during an earthquake.

The perspective view of the seismic isolation apparatus which shows one Embodiment of this invention Side view of seismic isolation device Plan sectional view of seismic isolation device Front view of building with seismic isolation device Side sectional view of the seismic isolation device installed in the building Plan sectional view showing operation of seismic isolation device Side sectional view showing operation of seismic isolation device Enlarged side sectional view showing operation of the seismic isolation device Side sectional view showing operation of seismic isolation device Enlarged side sectional view showing operation of the seismic isolation device

  FIG. 1 thru | or FIG. 10 shows one Embodiment of this invention, and shows the seismic isolation apparatus which absorbs the shaking of the earthquake transmitted from the ground side to the building side.

  The seismic isolation device 1 shown in the figure includes a device main body 10 fixed to the ground side and a movable body 20 fixed to the seismic isolation object side.

  The apparatus main body 10 includes a circular bottom surface portion 11 and a circumferential peripheral wall portion 12 as a contact portion extending upward from the periphery of the bottom surface portion 11. For example, the outer diameter of the bottom surface portion 11 is 400 mm and the peripheral wall portion 12. Is formed with a height of 100 mm. A plurality of grooves 11 a through which the lubricating oil flows are provided on the upper surface of the bottom surface portion 11, and each groove 11 a is formed to extend radially from the center of the bottom surface portion 11 toward the peripheral wall portion 12.

  The movable body 20 is made of a member whose upper surface and lower surface are formed in a circular shape, and is disposed on the bottom surface portion 11 of the apparatus main body 10 so as to be movable in the horizontal direction. The movable body 20 is formed so that the outer diameter of the upper surface and the lower surface is 200 mm and the height is 70 mm, for example, and the outer peripheral surface thereof is spaced from the inner peripheral surface of the peripheral wall portion 12 of the apparatus main body 10. The movable body 20 includes a plurality of cylinders 21 extending radially from the center side of the movable body 20 to the outer peripheral surface, a plurality of pistons 22 provided in each cylinder 21 so as to be slidable in the radial direction of the movable body 20, A plurality of springs 23 for urging each cylinder 21 outward in the radial direction are provided, and a storage chamber 24 for storing the lubricating oil A is provided on the center side of the movable body 20.

  Each cylinder 21 has a piston 22 inserted at one end and a circulation hole 21 a for lubricating oil A circulation at the other end. The circulation hole 21 a communicates with the storage chamber 24. In this case, the flow hole 21 a is formed smaller than the inner diameter of the cylinder 21.

  Each piston 22 is formed so that one end side protrudes from the outer peripheral surface of the movable body 20 toward the inner peripheral surface of the peripheral wall portion 12 of the apparatus main body 10, and the other end side is locked to one end side in the cylinder 21. Is formed.

  Each spring 23 is a coil spring, and is arranged in a compressed state between the other end of the cylinder 21 and the other end of the piston 22.

  The storage chamber 24 is formed so that the cross section in the radial direction of the movable body 20 is circular, and the lower end thereof is opened on the lower surface of the movable body 20. In this case, the lower surface opening of the storage chamber 24 is in close contact with the bottom surface portion 11 of the apparatus main body 10 and communicates with one end side of each groove 11 a of the bottom surface portion 11 (center side of the bottom surface portion 11). The storage chamber 24 is filled with the lubricating oil A, and the lubricating oil A is also filled between the other end of the cylinder 21 and the other end of the piston 22. Thus, when the piston 22 moves toward the inside of the movable body 20, the lubricating oil A in the cylinder 21 flows into the storage chamber 24 through the flow hole 21a, and the lubricating oil A in the storage chamber 24 is correspondingly increased. It is pushed out into each groove 11a. When the piston 22 moves toward the outside of the movable body 20, the lubricating oil A in the storage chamber 24 flows into the cylinder 21 through the flow hole 21a, and the lubricating oil A in each groove 11a is correspondingly increased. It is sucked into the storage chamber 24.

  In addition, a mounting plate 25 on which the seismic isolation object is mounted is provided on the upper surface of the movable body 20, and the mounting plate 25 is formed in a disk shape having a slightly larger outer diameter than the upper surface of the movable body 20. Yes. A space is provided between the peripheral end of the mounting plate 25 and the upper end of the peripheral wall portion 12 to allow the movement of the movable body 20 with respect to the apparatus main body 10, and by a cover 26 that can expand and contract in the radial direction of the movable body 20. The cover 26 is made of a flexible member formed in a bellows shape.

  The seismic isolation device 1 configured as described above is installed, for example, in a building 2 as a seismic isolation object shown in FIG. In the building 2, the building body 3 is disposed on a pressure-resistant board 4 having a reinforced concrete structure, and the pressure-resistant board 4 is formed on the ground 5. The seismic isolation device 1 is disposed at a plurality of locations between the base 3a of the building body 3 and the pressure platen 4, and the device body 10 is fixed to the pressure platen 4 as shown in FIG. A plate 25 is fixed to the base 3a.

  In the seismic isolation device 1 of the present embodiment, when a roll due to an earthquake occurs, the movable body 20 fixed on the building 2 side moves in the horizontal direction with respect to the device main body 10 fixed on the ground 5 side, and the ground The vibration from the 5 side to the building 2 side is absorbed. At this time, when the apparatus main body 10 moves in the horizontal direction with respect to the movable body 20 as indicated by the one-dot chain arrows in FIGS. 6 to 8, the inner periphery of the apparatus main body 10 as indicated by the solid line arrows in FIGS. The piston 22 located on the outer peripheral surface side of the movable body 20 that is to approach the surface is in contact with the inner peripheral surface of the apparatus main body 10 and resists the spring 23 toward the center of the movable body 20 in the cylinder 21. Moving. At that time, as indicated by the broken line arrows in FIGS. 6 to 8, the lubricating oil A in the storage chamber 24 is pushed into the grooves 11 a as the piston 22 moves, and the lower surface of the movable body 20 and the bottom surface of the apparatus main body 10. Lubricating oil A is supplied between the parts 11. Thereby, the sliding resistance between the lower surface of the movable body 20 due to the load of the building 2 and the bottom surface portion 11 of the apparatus main body 10 is reduced by the lubricating oil A, and the movable body 20 smoothly moves on the bottom surface portion 10 of the apparatus main body 10. To do. In addition, a damping force is generated in the piston 22 due to the flow resistance when the lubricating oil A flows through the flow hole 21a by the movement of the piston 22, and excessive displacement of the movable body 20 with respect to the apparatus main body 10 is suppressed.

  After the shaking of the earthquake ceases, the piston 22 moves toward the outside of the movable body 20 by the restoring force of the spring 23 as shown by the solid line arrows in FIGS. 9 and 10, and the dashed line arrow in FIGS. 9 and 10. As shown, the movable body 20 is returned to the center side of the apparatus main body 10 and the building 2 returns to the original position. At that time, as indicated by the broken line arrows in FIGS. 9 and 10, the lubricating oil A in each groove 11 a is sucked into the storage chamber 24 as the piston 22 moves, and the lubricating oil A in the storage chamber 24 is correspondingly increased. Is sucked into the cylinder 21.

  As described above, according to the seismic isolation device of this embodiment, the movable body 20 fixed to the building 2 side has a plurality of cylinders 21 extending radially in the horizontal direction, and the inside of each cylinder 21 can be moved in the horizontal direction. A plurality of pistons 22 and a plurality of springs 23 for urging each piston 22 toward the outer side in the horizontal direction of the movable body 20, and the movable body 20 is attached to the apparatus body 10 fixed to the ground 5 side. A bottom surface portion 11 disposed so as to be movable in the horizontal direction and a peripheral wall portion 12 with which the piston 22 of the movable body 20 moving in the horizontal direction abuts are provided, and the piston 22 is brought into contact with the peripheral wall portion 12 of the apparatus body 10 by contact. Since the movable body 20 moves toward the inner side in the horizontal direction against the spring 23, the movable body 20 can be returned to the center side of the apparatus main body 10 by the spring 23 provided on the movable body 20. Thereby, it is not necessary to separately provide a spring for returning the building 2 to the original position outside the apparatus main body 10, which is extremely advantageous when the installation space under the floor is small.

  In this case, since the piston 22 provided on the movable body 20 is moved in the horizontal direction, the entire apparatus can be downsized in the vertical direction, which is advantageous when there is little space in the height direction under the floor. is there.

  Further, since the plurality of pistons 22 are respectively provided in the plurality of cylinders 21 extending radially in the horizontal direction, any one of the pistons 22 can be brought into contact with the peripheral wall portion 12 of the apparatus main body 10, and the movable body 20 The original position can be restored by moving in any direction in the horizontal direction with respect to the apparatus main body 10.

  Further, when the piston 22 moves in the cylinder 21 toward the inside of the movable body 20, the lubricating oil A filled in the cylinder 21 is pushed out of the cylinder 21 by the piston 22 to the outside of the movable body 20. When the piston 22 is moved toward the inside of the apparatus main body 10 by the spring 23, the lubricating oil A outside the movable body 20 is moved into the cylinder 21 by the piston 22. Therefore, the lubricating oil A can be supplied between the lower surface of the movable body 20 and the bottom surface portion 11 of the apparatus main body 10 while flowing the lubricating oil A along with the shaking of the earthquake. Thereby, the sliding resistance between the lower surface of the movable body 20 and the bottom surface portion 11 of the apparatus main body 10 due to the load of the building 2 can be effectively reduced by the lubricating oil A. 10 can be always moved smoothly on the bottom surface 10.

  Furthermore, since the groove 11a through which the lubricating oil A pushed out from the cylinder 21 is circulated is provided in the bottom surface portion 11 of the apparatus main body 10, the lubricating oil A is separated from the lower surface of the movable body 20 and the bottom surface portion of the apparatus main body 10 by the groove 11a. 11 and the sliding resistance between the movable body 20 and the apparatus main body 10 can be more reliably reduced.

  In this case, since the groove 11 a is formed so as to extend radially from the center side of the bottom surface portion 11 of the apparatus main body 10 toward the inner peripheral surface, the lubricating oil A is applied to the lower surface of the movable body 20 and the bottom surface portion 11 of the apparatus main body 10. Even when the movable body 20 moves in any direction in the horizontal direction with respect to the apparatus main body 10, it is possible to reliably obtain the effect of reducing the sliding resistance by the lubricating oil A. it can.

  Further, since the lubricating oil A in the cylinder 21 flows out of the cylinder 21 through the flow hole 21a smaller than the inner diameter of the cylinder 22, the flow resistance when the lubricating oil A flows through the flow hole 21a. A damping force can be applied to the piston 22, and the piston 22 and the cylinder 21 can function as an oil damper. Thereby, since the excessive displacement of the movable body 20 with respect to the apparatus main body 10 can be suppressed, the impact absorption effect to the building 2 side can be heightened.

  In the above-described embodiment, the groove 11 a is provided on the bottom surface portion 11 of the apparatus main body 10. However, the groove 11 a may be provided on the lower surface of the movable body 20.

  DESCRIPTION OF SYMBOLS 1 ... Seismic isolation device, 2 ... Building, 5 ... Ground, 10 ... Apparatus main body, 11 ... Bottom surface part, 12 ... Perimeter wall part, 11a ... Groove, 20 ... Movable body, 21 ... Cylinder, 21a ... Distribution hole, 22 ... Piston 23 ... Spring, A ... Lubricating oil.

Claims (4)

A device main body fixed to the ground side and a movable body arranged in the device main body so as to be movable in the horizontal direction and fixed to the seismic isolation object side, from the ground side to the seismic isolation object side due to the earthquake In the seismic isolation device that absorbs the shaking by moving the movable body in the horizontal direction relative to the device body,
A plurality of cylinders extending radially in the horizontal direction, a plurality of pistons movable in each cylinder in the horizontal direction, and a spring for urging each piston toward the outside in the horizontal direction of the movable body. While providing
The apparatus main body is provided with a bottom surface portion on which the movable body is movably disposed in the horizontal direction, and a contact portion on which the piston of the movable body moving in the horizontal direction abuts.
The piston is configured to move toward the inner side in the horizontal direction of the movable body against the biasing means by contact with the contact portion of the apparatus main body ,
When the piston moves in the cylinder toward the inside of the movable body, the lubricating oil filled in the cylinder is pushed out of the cylinder by the piston to the outside of the movable body, and between the lower surface of the movable body and the bottom surface of the apparatus main body. A seismic isolation device configured to be configured so that when the piston is moved toward the inside of the device main body by the biasing means, lubricating oil outside the movable body is sucked into the cylinder by the piston . At least one of the bottom portion of the lower surface and the apparatus main body of the movable body, the isolator according to claim 1, characterized in that a groove for circulating the lubricating oil forced out from inside the cylinder. The seismic isolation device according to claim 2, wherein the groove is formed to extend radially from the center side of the bottom surface of the device main body toward the inner peripheral surface. The seismic isolation device according to claim 1, 2 or 3, wherein the lubricating oil in the cylinder flows out of the cylinder through a flow hole smaller than the inner diameter of the cylinder.

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