JP5233825B2 - 3D seismic isolation device - Google Patents

Description

  The present invention relates to a three-dimensional seismic isolation device.

  Conventionally, three-dimensional seismic isolation devices using various springs have been proposed in order to protect and support seismic isolation objects such as buildings and heavy buildings from earthquake vibrations and shocks.

  FIG. 5 is a side sectional view showing an example of a conventional three-dimensional seismic isolation device. The three-dimensional seismic isolation device includes a laminated rubber 1 having a horizontal seismic isolation function and an accumulator 2 connected in a vertical direction. Are provided between the foundation B and the seismic isolation object H.

  The hydraulic cylinder 3 includes a hydraulic cylinder body 3b that forms an internal space 3a, and an internal space 3a of the hydraulic cylinder body 3b that is vertically movable and has an upper end that is external to the hydraulic cylinder body 3b. And a piston rod 3c that projects to the outside. On the other hand, the accumulator 2 has an accumulator body 2b that forms an internal space 2a, and an internal piston body 2c that is slidably fitted in the internal space 2a of the accumulator body 2b in the vertical direction. A lower space 2d of the accumulator main body 2b partitioned by 2c and a liquid chamber 3d formed on the lower surface side of the piston rod 3c inside the hydraulic cylinder main body 3b are connected by a communication pipe 4. Here, the lower space 2d of the accumulator main body 2b and the liquid chamber 3d of the hydraulic cylinder main body 3b are filled with liquid such as oil, and the upper space 2e of the accumulator main body 2b partitioned by the internal piston body 2c. The interior is filled with an inert gas such as nitrogen gas.

  Patent Documents 1 and 2 include, for example, general technical levels related to a three-dimensional seismic isolation device including a laminated rubber and a hydraulic cylinder.

JP 2003-213862 A Japanese Patent Laid-Open No. 11-230258

  However, such a three-dimensional seismic isolation device has a problem that a large space is required separately from the hydraulic cylinder 3 because the accumulator 2 and the communication pipe 4 are disposed outside the hydraulic cylinder 3. . Further, since the hydraulic pressure of the hydraulic cylinder 3 is high by the accumulator 2, there is a problem that the design of the communication pipe 4 and the connecting means is not easy and the manufacturing cost increases.

  In view of such circumstances, the present invention intends to provide a three-dimensional seismic isolation device capable of saving space and reducing costs.

The present invention is a three-dimensional seismic isolation device in which a laminated rubber having a seismic isolation function in the horizontal direction and a hydraulic cylinder having a seismic isolation function in the vertical direction are arranged in the vertical direction,
The hydraulic cylinder includes a cylinder body having a first liquid chamber formed therein, and a piston body is disposed in the first liquid chamber of the cylinder body so as to be movable up and down.
The piston body, which has an internal space communicating with the first liquid chamber, the inner piston member vertically movably disposed in said interior space, the internal piston body, said internal space, to said first fluid chamber It is configured to be divided into a second liquid chamber communicating with the same inner diameter and an air chamber enclosing gas,
It said piston body, a partition portion for partitioning the air chamber into a first air chamber and the second air chamber is provided, on the partition switching unit, the first air chamber and the second gas chamber and circulation gas and gas The present invention relates to a three-dimensional seismic isolation device, characterized in that it is provided with a throttle part that restricts the flow rate of the gas.

  According to the three-dimensional seismic isolation device of the present invention, the internal space of the piston body is divided by the internal piston body into a second liquid chamber that communicates with the first liquid chamber and an air chamber that encloses gas. The structure of the accumulator can be obtained inside the cylinder, so that it is not necessary to arrange the accumulator and the communication pipe outside the hydraulic cylinder, and space can be saved. In addition, even if the hydraulic pressure of the hydraulic cylinder is high, the accumulator configuration is provided in the hydraulic cylinder, so that communication pipes and connection means are not required, and the design can be facilitated and the cost can be reduced. An excellent effect can be achieved.

It is a sectional side view which shows the outline | summary of the 1st reference example of this invention. It is a sectional side view which shows the outline | summary of the 2nd reference example of this invention. It is a graph which shows the effect | action which a vibration attenuate | damps with a diaphragm. It is a plane sectional view showing the outline of the first example of the present invention. It is a sectional side view which shows an example of the conventional three-dimensional seismic isolation apparatus.

Hereinafter, the first reference example forms of implementing the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a first reference example of the present invention. In the drawing, the same reference numerals as those in FIG. 5 denote the same parts, and the three-dimensional seismic isolation device of the first reference example has a horizontal direction. An upper laminated rubber 1 having a seismic isolation function and a lower hydraulic cylinder 5 having a vertical seismic isolation function are arranged vertically. Here, the laminated rubber 1 and the hydraulic cylinder 5 may be arranged such that the hydraulic cylinder 5 is arranged on the lower side and the laminated rubber 1 is arranged on the upper side as shown in FIG. 1, or the hydraulic cylinder 5 is arranged on the upper side. In addition, the laminated rubber 1 may be disposed on the lower side.

  The hydraulic cylinder 5 includes a cylinder body 7 having a first liquid chamber 6 formed therein, and a piston body 8 is disposed in the first liquid chamber 6 of the cylinder body 7 so as to be vertically movable in the vertical direction. Further, the upper end portion of the piston body 8 protrudes outside the cylinder body 7. In addition, the first liquid chamber 6 of the cylinder body 7 is filled with a working fluid (liquid) such as lubricating oil, and the first liquid chamber 6 is provided between the inner peripheral surface 7 a of the cylinder body 7 and the outer peripheral surface 8 a of the piston body 8. A seal member (not shown) such as an O-ring is arranged so that the hydraulic fluid in the liquid chamber 6 does not leak outside.

On the other hand, the piston body 8 has an internal space 9 that communicates with the first liquid chamber 6, and a disk-shaped internal piston body 10 is disposed in the internal space 9 of the piston body 8 so as to be movable up and down. The internal space 9 is divided into a lower second liquid chamber 11 communicating with the first liquid chamber 6 and an upper air chamber 12. The second liquid chamber 11 of the piston body 8 has a lower surface opened to the first liquid chamber 6 so that hydraulic oil can flow between the second liquid chamber 11 and the first liquid chamber 6. Further, the gas chamber 12 is filled with an inert gas such as N ₂ gas. Here, it is preferable that a lower end of the inner peripheral surface 8 b of the piston body 8 is provided with a protruding drop prevention portion (not shown) so that the inner piston body 10 does not fall into the first liquid chamber 6.

Next, the operation of the first reference example will be described.

  When an earthquake or the like occurs, the load in the horizontal direction is absorbed by the laminated rubber 1 and the load in the vertical direction is absorbed by the hydraulic cylinder 5. At this time, in the hydraulic cylinder 5, the piston body 8 vibrates in the vertical direction and absorbs the load, and the internal piston body 10 controls the pressure of the hydraulic fluid in the first liquid chamber 6 and the second liquid chamber 11 in the air chamber 12. The instantaneous fluctuation of pressure is relieved by the volume elasticity of the gas in the air chamber 12.

Thus, according to the first reference example, the internal piston body 10, the second liquid chamber 11, and the air chamber 12 are provided in the piston body 8 of the hydraulic cylinder 5 to obtain an accumulator configuration. Therefore, it is not necessary to arrange an accumulator, a communication pipe, and the like outside the hydraulic cylinder 5, thereby saving space. Here, the piston body 8 of the hydraulic cylinder 5 has a structure of an accumulator inside, so that it is slightly larger than the size of the conventional hydraulic cylinder 3 by the amount of the built-in structure of the accumulator. Since the surface pressure resistance of the laminated rubber 1 is greater than the surface pressure resistance (force per unit pressure-receiving area) of the hydraulic cylinder 5, it does not become large enough to exceed the area occupied by the laminated rubber 1, and the apparatus is installed. Will not be affected.

  Even if the hydraulic pressure of the hydraulic cylinder 5 is high, the structure of the accumulator is provided inside the hydraulic cylinder 5, so that communication pipes and connecting means are not required and the design is facilitated and the cost is reduced. be able to. Furthermore, since the hydraulic fluid of the first liquid chamber 6 exists on the outer peripheral surface 8a of the piston body 8 up to the position of the seal member (not shown), the pressure acting on the outer peripheral surface 8a of the piston body 8 and the piston body 8 The pressure acting on the inner peripheral surface 8b becomes equal, and the influence of the pressure difference can be reduced to reduce the thickness of the outer peripheral portion 8c of the piston body 8, thereby reducing the cost.

2 and 3 show a second reference example of the present invention, and the three-dimensional seismic isolation device of the second reference example is obtained by changing the configuration of the piston body 8 of the first reference example. Parts denoted by the same reference numerals as 1 represent the same items.

The piston body 13 of the second reference example has an internal space 14 that communicates with the first liquid chamber 6, and a disk-like internal piston body 15 is disposed in the internal space 14 of the piston body 13 so as to be movable up and down. The body 15 divides the internal space 14 into a lower second liquid chamber 16 communicating with the first liquid chamber 6 and an upper air chamber 17. Further, the piston body 13 includes a lower surface portion 18 at the lower end of the second liquid chamber 11, and a throttle portion 19 having a predetermined diameter is formed at the center of the lower surface portion 18 so that the hydraulic oil is connected to the first liquid chamber 6 and the second liquid chamber 6. The liquid chamber 11 can be circulated. Further, the gas chamber 12 is filled with an inert gas such as N 2 gas. Further, a seal member (not shown) such as an O-ring is provided between the inner peripheral surface 7a of the cylinder body 7 and the outer peripheral surface 13a of the piston body 13 so that the hydraulic fluid in the first liquid chamber 6 does not leak outside. Is arranged.

Next, the operation of the second reference example will be described.

When an earthquake or the like occurs, the load in the horizontal direction is absorbed by the laminated rubber 1 and the load in the vertical direction is absorbed by the hydraulic cylinder 5 as in the first reference example. At this time, in the hydraulic cylinder 5, the piston body 13 oscillates in the vertical direction to absorb the load, and the internal piston body 15 controls the pressure of the working fluid in the first liquid chamber 6 and the second liquid chamber 16 in the air chamber 12. The instantaneous fluctuation of pressure is relieved by the volume elasticity of the gas in the air chamber 12.

  Furthermore, hydraulic oil flows through the throttle portion 19 of the piston body 13 from the first liquid chamber 6 to the second liquid chamber 16 or from the second liquid chamber 16 to the first liquid chamber 6. The flow rate is limited, resulting in pressure loss and faster vibration damping. Here, the speed at which the vibration is attenuated is determined by the diaphragm 19 as shown in the graph of FIG. 3, and the vibration in the vertical direction is absorbed with attenuation.

Thus, according to the second reference example as described above, the same operational effects as those of the first reference example can be obtained. Further, if the piston body 13 is provided with a throttle portion 19 that allows the liquid to flow through the first liquid chamber 6 and the second liquid chamber 16 and restricts the flow rate of the liquid, the vibration can be reduced without affecting the space saving. Can be suitably dealt with by vibrations and loads such as earthquakes.

FIG. 4 is a first embodiment of the present invention, and the three-dimensional seismic isolation device of the first embodiment is a further modification of the configuration of the piston body 8 of the first reference example. Parts with the same reference numerals represent the same thing.

The piston body 20 of the first embodiment has an internal space 21 that communicates with the first liquid chamber 6, and a disk-shaped internal piston body 22 is disposed in the internal space 21 of the piston body 20 so as to be movable up and down. The body 22 divides the internal space 21 into a lower second liquid chamber 23 communicating with the first liquid chamber 6 and an upper air chamber 24. Further, the piston body 20 is filled with an inert gas such as N2 gas in the air chamber 24 and has a partition part 25 to make the air chamber 24 into a first air chamber 24a and a second air chamber 24b. It is divided. Further, a narrowed portion 26 having a predetermined diameter is formed in the center of the partition portion 25 of the air chamber 24 so that gas can flow between the first air chamber 24a and the second air chamber 24b. Furthermore, a seal member (not shown) such as an O-ring is provided between the inner peripheral surface 7a of the cylinder body 7 and the outer peripheral surface 20a of the piston body 20 so that the hydraulic fluid in the first liquid chamber 6 does not leak outside. ).

Next, the operation of the first embodiment will be described.

When an earthquake or the like occurs, the load in the horizontal direction is absorbed by the laminated rubber 1 and the load in the vertical direction is absorbed by the hydraulic cylinder 5 as in the first reference example. At this time, in the hydraulic cylinder 5, the piston body 20 vibrates in the vertical direction to absorb the load, and the internal piston body 22 controls the pressure of the working fluid in the first liquid chamber 6 and the second liquid chamber 23 in the air chamber 24. The momentary fluctuation in pressure is mitigated by the bulk elasticity of the gas in the air chamber 24.

  Further, gas flows from the first air chamber 24a to the second air chamber 24b or from the second air chamber 24b to the first air chamber 24a in the throttle portion of the piston body 20, and at the same time, the gas flow rate is restricted by the throttle portion 26. This causes pressure loss and accelerates vibration damping.

Thus, according to the first embodiment as described above, it is possible to obtain the same operational effects as those of the first reference example. Further, the piston body 20 is provided with a partition part 25 for dividing the air chamber 24 into a first air chamber 24a and a second air chamber 24b, and the first air chamber 24a and the second air chamber 24b are provided in the partition part 25. When the throttle part 26 that allows gas to flow and restricts the flow rate of the gas is provided, the space saving is not affected, and the damping of the vibration can be accelerated and the vibration and the load such as an earthquake can be suitably dealt with.

  Note that the three-dimensional seismic isolation device of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Laminated rubber 5 Hydraulic cylinder 6 1st liquid chamber 7 Cylinder body 8 Piston body 9 Internal space 10 Internal piston body 11 Second liquid chamber 12 Air chamber 13 Piston body 14 Internal space 15 Internal piston body 16 Second liquid chamber 17 Air Chamber 19 Restriction portion 20 Piston body 21 Internal space 22 Internal piston body 23 Second liquid chamber 24 Air chamber 24a First air chamber 24b Second air chamber 25 Partition portion 26 Restriction portion

Claims (1)

A three-dimensional seismic isolation device that vertically arranges a laminated rubber having a seismic isolation function in the horizontal direction and a hydraulic cylinder having a seismic isolation function in the vertical direction,
The hydraulic cylinder includes a cylinder body having a first liquid chamber formed therein, and a piston body is disposed in the first liquid chamber of the cylinder body so as to be movable up and down.
The piston body, which has an internal space communicating with the first liquid chamber, the inner piston member vertically movably disposed in said interior space, the internal piston body, said internal space, to said first fluid chamber It is configured to be divided into a second liquid chamber communicating with the same inner diameter and an air chamber enclosing gas,
It said piston body, a partition portion for partitioning the air chamber into a first air chamber and the second air chamber is provided, on the partition switching unit, the first air chamber and the second gas chamber and circulation gas and gas A three-dimensional seismic isolation device, characterized by having a restrictor that restricts the flow rate.

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