JP2003213962A - Seismic isolator using hydraulic cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regulate attenuation effect to vertical vibration without allowing forcible force not to act on working oil piping of a hydraulic cylinder. <P>SOLUTION: A seismic isolator using the hydraulic cylinder comprises the hydraulic cylinder 3 for fitting a piston 6 to a cylinder 7 to form a cylinder pressurized chamber 8 and connecting the cylinder pressurized chamber 8 through the working oil piping 9 to an accumulator 10, and a laminated rubber 2 provided to be piled on the hydraulic cylinder 3. The hydraulic cylinder 3 and the laminated rubber 2 are piled in order of the laminated rubber 2, the piston 6 and the cylinder pressurized chamber 8, and they are fixed and arranged between foundation 1 and a base-isolation object 4. The accumulator 10 is fixed in the side where the cylinder pressurized chamber 8 of the foundation 1 or the base-isolation object 4 is fixed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder using a hydraulic cylinder in which an unreasonable force does not act on a hydraulic oil pipe of the hydraulic cylinder and a damping effect can be adjusted with respect to longitudinal vibration. It relates to seismic devices.

[0002]

2. Description of the Related Art Conventionally, seismic isolation devices using various springs have been proposed in order to support and support seismic isolation targets such as buildings or other heavy constructions against vibrations and shocks such as earthquakes. It has been.

There is a seismic isolation device using a spring of this kind, for example, one using an air spring. In this system using an air spring, a soft restoring force can be obtained due to the compressive elasticity of air, but vibration and impact are not generated. When it occurs, there is a problem that it shakes greatly in the horizontal direction (horizontal direction), and there is a problem that a wider installation area is required.

In order to reduce the vibration, it is considered to use a disc spring or a metal spring having an increased spring rigidity. However, if the rigidity of the spring is increased, the vibration isolation performance is deteriorated. Further, when a disc spring or a metal spring is used, there is a problem that the seismic isolation device becomes large.

FIG. 6 shows an example of a seismic isolation device using a hydraulic cylinder, which is considered as an effective means for solving such a conventional problem. In the seismic isolation device using the hydraulic cylinder of FIG. 6, the laminated rubber 2 is installed on the foundation 1, the hydraulic cylinder 3 is stacked and installed on the upper part of the laminated rubber 2, and the heavy building or the like is installed on the upper part of the hydraulic cylinder 3. 3D seismic isolation can be performed by placing the seismic isolation target 4 of FIG.

The hydraulic cylinder 3 is provided with a piston 6 whose upper end is fitted to a swivel 5 having a spherical shape, for example, which is fixed to the bottom surface of the seismic isolation object 4 so as to project downward, and a cylinder 7 surrounding the piston 6. Inside the lower end of the piston and the piston 6
A cylinder pressurizing chamber 8 is formed between the lower end of the cylinder and the lower end of the cylinder.
The lower end of the hydraulic cylinder 3 on the cylinder pressurizing chamber 8 side is fixed on the laminated rubber 2. In the figure, 2a is a thin rubber,
2b is a thin steel plate, and 13 is a seal.

A hydraulic oil pipe 9 is provided in the cylinder pressurizing chamber 8.
The accumulator 10 is connected via. The accumulator 10 is provided with a flexible partition wall 11 so that oil such as air in the gas chamber 12 is compressed by oil communicating with the cylinder pressurizing chamber 8.

As shown in FIG. 6, the accumulator 10 is fixed to the seismic isolation target 4 side by the fixing member 14 and is fixed to the base 1 side by the fixing member 14 as shown in FIG. There are cases when it is set to.

The swivel 5 is for absorbing the inclination of the seismic isolation device when the foundation 1 laterally moves relative to the seismic isolation target 4 due to an earthquake. Some are not provided, and some are designed to absorb the tilt of the seismic isolation device by other methods.

In the seismic isolation device using the hydraulic cylinder shown in FIGS. 6 and 7, the weight of the seismic isolation object 4 is transmitted to the oil filled in the cylinder pressurizing chamber 8 via the swivel 5 and the piston 6. Further, it is transmitted from the cylinder 7 to the foundation 1 via the laminated rubber 2. The oil in the cylinder pressurizing chamber 8 compresses the air in the gas chamber 12 via the flexible partition wall 11 provided in the accumulator 10, and the compression of this air causes the seismic isolation target 4 to reach a certain height. It is supposed to be retained.

When the foundation 1 vertically vibrates due to the occurrence of an earthquake, the laminated rubber 2 and the cylinder 7 move up and down with respect to the piston 6 as the foundation 1 moves up and down. When the interval increases, the pressure oil of the accumulator 10 is introduced into the cylinder pressurizing chamber 8,
Further, when the interval between the cylinder pressurizing chambers 8 decreases, the pressure oil in the cylinder pressurizing chambers 8 acts to be supplied to the accumulator 10, and the shock of vibration is attenuated by the flow resistance of the hydraulic oil pipe 9. Gas chamber 12 of accumulator 10
The seismic isolation target 4 is softly supported by the compressive elasticity of the air. Therefore, the air spring provided by the accumulator 10 is effectively acted only on damping the vertical vibration of the foundation 1.

On the other hand, when a lateral (horizontal) movement of the foundation 1 occurs due to the occurrence of an earthquake, the laminated rubber 2 bends and deforms in response to the movement, whereby the seismic isolation target 4 is It is seismically isolated laterally. Due to the lateral movement of the foundation 1, the laminated rubber 2 is laterally displaced with respect to the hydraulic cylinder 3, which causes a tilting force of the entire seismic isolation device. By rotating the swivel 5 around the swivel 5 and bending the swivel 5, excessive force is prevented.

Therefore, according to the seismic isolation device using the hydraulic cylinder described above, vertical and horizontal three-dimensional seismic isolation can be performed.

[0014]

However, the conventional seismic isolation device using the hydraulic cylinder described above also has the following problems.

That is, in the conventional seismic isolation apparatus using a hydraulic cylinder, as shown in FIG. 6, an accumulator 10 connected to the cylinder pressurizing chamber 8 via a hydraulic oil pipe 9 is provided on the seismic isolated object 4 side. If fixed, the cylinder 7 connected to the hydraulic oil pipe 9 moves up and down with respect to the piston 6 when the foundation 1 vertically moves relative to the seismic isolation target 4 due to an earthquake. Therefore, as shown by the chain double-dashed line, the hydraulic oil pipe 9 is subjected to a stretching force and a bending force, so that the hydraulic oil pipe 9
There is a concern to damage the.

Further, as shown in FIG. 7, the cylinder pressurizing chamber 8
Accumulator 1 connected to hydraulic fluid piping 9 via
When 0 is fixed to the foundation 1 side, when the foundation 1 laterally moves relative to the seismic isolation target 4 due to an earthquake, the hydraulic cylinder 3 (the seismic isolation target Since the accumulator 10 moves laterally with respect to the object 4), there is a concern that the hydraulic oil pipe 9 may be stretched or bent to damage the hydraulic oil pipe 9.

Therefore, in order to allow such expansion and contraction force and bending force acting on the hydraulic oil pipe 9, the hydraulic oil pipe 9 is provided with a bellows structure, or the hydraulic oil pipe 9 is extended for a long time to expand and contract or bend. Although it is necessary to take measures such as absorbing the force, there is a problem that the structure of the device becomes complicated and large in size.

On the other hand, the damping effect of the accumulator 10 connected to the cylinder pressurizing chamber 8 is usually uniquely determined, and therefore the strength of the longitudinal earthquake (acceleration) is obtained.
It was not possible to adjust the damping effect so that

The present invention has been made to solve the problems of the conventional device, and prevents an unreasonable force from acting on the hydraulic oil pipe of the hydraulic cylinder, and also has a damping effect on longitudinal vibration. It is an object of the present invention to provide a seismic isolation device using a hydraulic cylinder capable of adjusting the vibration.

[0020]

The invention according to claim 1 is
From a hydraulic cylinder in which a piston is fitted into a cylinder to form a cylinder pressurizing chamber, the cylinder pressurizing chamber being connected to an accumulator through a hydraulic oil pipe, and a laminated rubber which is provided in a stacked manner on the hydraulic cylinder. A seismic isolation device using a hydraulic cylinder, wherein the hydraulic cylinder and laminated rubber are stacked in the order of laminated rubber, piston, and cylinder pressure chamber, and fixedly arranged between the foundation and the seismic isolation target,
It is a seismic isolation device using a hydraulic cylinder, characterized in that an accumulator is fixed to the side of the foundation or the base isolation target on which the cylinder pressure chamber is fixed.

According to a second aspect of the present invention, a piston is fitted in the cylinder to form a cylinder pressurizing chamber, and the cylinder pressurizing chamber is connected to an accumulator through a hydraulic oil pipe, and the hydraulic cylinder. A seismic isolation device using a hydraulic cylinder made of laminated rubber that is stacked and provided on the hydraulic oil pipe, wherein the hydraulic oil pipe is provided with a throttle for setting a flow passage cross-sectional area. It is a seismic isolation device.

According to a third aspect of the present invention, a piston is fitted into the cylinder to form a cylinder pressurizing chamber, and the cylinder pressurizing chamber is connected to an accumulator through a hydraulic oil pipe, and the hydraulic cylinder. A seismic isolation device using a hydraulic cylinder made of laminated rubber that is stacked and provided on an accumulator, and an auxiliary accumulator connected to the accumulator via a communication pipe, and a throttle for setting a flow passage cross-sectional area in the communication pipe. It is a seismic isolation device using a hydraulic cylinder.

According to a fourth aspect of the present invention, the relative movement speed of the base and the base-isolated object in which the piston of the hydraulic cylinder is attached to one of the base and the base-isolated object and the laminated rubber is fixed to the other is detected. 4. A seismic isolation apparatus using a hydraulic cylinder according to claim 2, further comprising a controller for changing the flow passage cross-sectional area of the throttle based on the relative moving speed detected by the detector. Is.

According to a fifth aspect of the present invention, there is provided a seismic isolation device using the hydraulic cylinder according to the first aspect, wherein the hydraulic cylinder is provided with the configuration according to any one of the second to fourth aspects. It was a seismic isolation device.

According to the above means, the following operations are performed.

According to the first aspect of the invention, the hydraulic cylinder and the laminated rubber are stacked in the order of the laminated rubber, the piston and the cylinder pressurizing chamber and fixedly arranged between the foundation and the seismic isolated object. Since the accumulator is fixed on the side where the cylinder pressurization chamber of the seismic object is fixed, even if the foundation moves relative to the seismic isolated object in the vertical and horizontal directions, it will move between the cylinder and accumulator. Does not occur. Therefore, there is no fear that an excessive force is applied to the hydraulic oil pipe.

According to the second aspect of the present invention, the hydraulic oil pipe connecting the cylinder pressurizing chamber and the accumulator is provided with a throttle for setting the flow passage cross-sectional area. By setting the flow passage cross-sectional area of the throttle,
The damping effect on the longitudinal vibration by the accumulator can be adjusted.

According to the third aspect of the invention, the auxiliary accumulator is connected to the gas chamber of the accumulator through the connecting pipe, and the connecting pipe is provided with the throttle for setting the flow passage cross-sectional area. By setting the flow passage cross-sectional area by the throttle according to the degree, it is possible to adjust the damping effect for the vertical vibration by the auxiliary accumulator based on the connecting pipe and the throttle in addition to the damping effect by the hydraulic oil pipe and the accumulator. The damping effect can be exerted.

In the invention according to claim 4, since the controller changes the flow passage cross-sectional area of the throttle based on the relative moving speed between the foundation and the seismic isolation target detected by the detector, The flow passage cross-sectional area of the throttle can be automatically adjusted according to the strength of vibration due to, and a suitable damping effect can be exhibited.

According to the fifth aspect of the present invention, there is no concern that an unreasonable force is applied to the hydraulic oil pipe, and a suitable damping effect can be exhibited.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the form of a seismic isolation device using the hydraulic cylinder of the present invention.
The same parts as those of the above are denoted by the same reference numerals, detailed description thereof will be omitted, and only the characteristic part of the present invention will be described in detail.

In the embodiment shown in FIG. 1, the laminated rubber 2 is fixed on the base 1. On the other hand, the hydraulic cylinder 3 is arranged such that the cylinder pressurizing chamber 8 formed in the cylinder 7 is located on the side far from the laminated rubber 2, that is, the laminated rubber 2, the piston 6 and the cylinder pressing chamber 8 are arranged in this order. The upper end of the cylinder 7 having the cylinder pressurizing chamber 8 is fixed to the lower surface of the seismic isolation target 4. Further, a fixing member 5 a having a swivel 5 fitted to the piston 6 of the hydraulic cylinder 3 is fixed on the laminated rubber 2.

Then, the accumulator 10 connected to the cylinder pressurizing chamber 8 of the hydraulic cylinder 3 via the hydraulic oil pipe 9 is fixed to the seismic isolation target 4 on the fixed side of the cylinder 7 via the fixing member 14. is doing. Reference numeral 15 in the figure denotes a sliding member provided on the outer circumference of the piston 6.

In the embodiment shown in FIG. 1, the laminated rubber 2
Is fixed to the foundation 1, the cylinder pressurizing chamber 8 is fixed to the seismic isolation target 4, and the cylinder pressurizing chamber 8 is fixed.
Since the accumulator 10 is fixed to the base 1, when the foundation 1 vertically moves relative to the seismic isolation target 4 due to an earthquake, only the laminated rubber 2 and the piston 6 move up and down. No movement occurs between the cylinder 7 fixed to the object 4 and the accumulator 10. Therefore, there is no concern that the hydraulic oil pipe 9 will be forced.

Further, in FIG. 1, when the foundation 1 moves laterally relative to the seismic isolation object 4 due to an earthquake,
The laminated rubber 2 only flexes and moves in the lateral direction, and the cylinder 7 and the accumulator 1 fixed to the seismic isolation target 4 are moved.
There is no movement between 0, so the hydraulic oil pipe 9
There is no concern that it will be overwhelmed.

FIG. 2 shows another example of the form of the seismic isolation device using the hydraulic cylinder of the present invention. The form example shown in FIG. 2 shows a case where the device of FIG. 1 is turned upside down. In FIG. 2, the laminated rubber 2 is fixed to the lower surface of the seismic isolation target 4. On the other hand, the hydraulic cylinder 3 is arranged such that the cylinder pressurizing chamber 8 formed in the cylinder 7 is on the side far from the laminated rubber 2, that is, the laminated rubber 2, the piston 6,
The cylinder pressurizing chambers 8 are stacked in this order, and the lower end of the cylinder 7 having the cylinder pressurizing chambers 8 is fixed to the upper surface of the base 1. Further, a fixing member 5a having a swivel 5 fitted to the piston 6 of the hydraulic cylinder 3 is fixed to the lower surface of the laminated rubber 2.

An accumulator 10 connected to the cylinder pressurizing chamber 8 of the hydraulic cylinder 3 via a hydraulic oil pipe 9 is fixed to the base 1 which is the fixed side of the cylinder 7 via a fixing member 14. .

In the embodiment shown in FIG. 2, the laminated rubber 2
Is fixed to the seismic isolation target 4, the cylinder pressurizing chamber 8 is fixed to the foundation 1, and the accumulator 10 is fixed to the base 1 to which the cylinder pressurizing chamber 8 is fixed. When the vertical movement is made relative to the seismic object 4, the cylinder 7 moves up and down together with the foundation 1, but since the accumulator 10 also moves together with the foundation 1, there is a gap between the cylinder 7 and the accumulator 10. Does not move at all. Therefore, there is no concern that the hydraulic oil pipe 9 will be forced.

Further, in FIG. 2, when the foundation 1 moves laterally relative to the seismic isolated object 4 due to an earthquake,
Since the hydraulic cylinder 3 and the accumulator 10 move together with the foundation 1 and only the laminated rubber 2 bends and moves in the lateral direction, there is no movement between the cylinder 7 and the accumulator 10, so that the hydraulic oil pipe 9 There is no concern that it will be unreasonable.

FIG. 3 shows another example of the form of the seismic isolation device using the hydraulic cylinder of the present invention. 3, in the seismic isolation device using the hydraulic cylinder in which the laminated rubber 2 and the hydraulic cylinder 3 are stacked in the same manner as in FIG. 6, the hydraulic oil pipe 9 connecting the cylinder pressurizing chamber 8 to the accumulator 10 is The diaphragm 16 is provided to set the flow passage cross-sectional area.

In the embodiment shown in FIG. 3, the hydraulic oil pipe 9 is provided with the throttle 16 for setting the flow passage cross-sectional area.
By changing the cross section of the flow path by, the resistance value to the flow of oil between the cylinder pressurizing chamber 8 and the accumulator 10 can be changed. Therefore, by setting the flow passage cross-sectional area of the throttle 16 according to the assumed intensity of the earthquake, it is possible to adjust the damping effect of the accumulator 10 on longitudinal vibration.

FIG. 4 shows still another example of the form of the seismic isolation device using the hydraulic cylinder of the present invention. 4, in the seismic isolation device using the hydraulic cylinder in which the laminated rubber 2 and the hydraulic cylinder 3 are stacked as in the case of FIG. 6, the connecting pipe 1 is connected to the gas chamber 12 of the accumulator 10.
An auxiliary accumulator 18 is connected via 7 and a throttle 19 for setting a flow passage cross-sectional area is provided in the connecting pipe 17.

In the embodiment shown in FIG. 4, the auxiliary accumulator 1 is connected to the gas chamber 12 of the accumulator 10 via the connecting pipe 17.
8 which connects 8 and sets the flow passage cross-sectional area in the connecting pipe 17
9 is provided, the resistance value to the flow of air between the accumulator 10 and the auxiliary accumulator 18 can be changed by changing the flow passage cross section of the throttle 19. Therefore, in addition to the damping effect by the accumulator 10 based on the flow resistance of the hydraulic oil pipe 9, by setting the flow passage cross-sectional area by the throttle 19 according to the assumed earthquake intensity,
Auxiliary accumulator 1 based on connecting pipe 17 and throttle 19
A large damping effect can be exhibited by adjusting the damping effect on the vibration in the vertical direction by 8.

In FIG. 5, the piston 6 of the hydraulic cylinder 3 is attached to one of the foundation 1 and the seismic isolation target 4 (in FIG. 5, the piston 6 is attached to the seismic isolation target 4), and the other is laminated rubber. A detector 20 for detecting the relative movement speed between the base 1 to which 2 is fixed and the seismic isolation target 4,
21 shows a case in which a controller 22 is provided, and a controller 22 is provided to change the flow passage cross-sectional area of the throttle 16 shown in FIG. 3 based on the relative moving speed detected by the detectors 20 and 21. An electromagnetic valve or the like can be used as the diaphragm 16 in this case.

In the embodiment shown in FIG. 5, the flow passage cross-sectional area of the diaphragm 16 is controlled by a command value from the controller 22 based on the relative moving speed between the foundation 1 and the seismic isolation object 4 detected by the detectors 20 and 21. Therefore, it is possible to automatically adjust the flow passage cross-sectional area of the throttle 16 in accordance with the strength (acceleration) of vibration due to an earthquake, and to exhibit a suitable damping effect.

In the example of the embodiment shown in FIG. 5, the flow passage cross-sectional area of the throttle 16 shown in FIG. 3 is automatically adjusted.
Although not shown, the diaphragm 1 provided in the connecting pipe 17 of FIG.
Similarly, the flow passage cross-sectional area of 9 can be automatically adjusted.

Further, the diaphragms 16 and 1 shown in FIGS.
9 and the configuration in which the flow passage areas of the throttles 16 and 19 shown in FIG. 5 are automatically adjusted, as shown in FIGS. , The laminated rubber 2, the piston 6, and the cylinder pressurizing chamber 8 are stacked in this order and fixedly arranged between the foundation 1 and the seismic isolation target 4. It can also be applied to a seismic isolation device in which the accumulator 10 is fixed on the fixed side.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

[0050]

According to the first aspect of the present invention, the hydraulic cylinder and the laminated rubber are stacked in the order of the laminated rubber, the piston and the cylinder pressurizing chamber and fixedly arranged between the foundation and the seismic isolated object. Since the accumulator is fixed to the side where the cylinder pressurization chamber of the base or the base isolation target is fixed, even if the base moves relative to the base isolation in the vertical and horizontal directions due to the earthquake, the cylinder and accumulator There is no movement between them, so that there is no concern that an excessive force is applied to the hydraulic oil pipe, which is an excellent effect.

According to the second aspect of the present invention, the hydraulic oil pipe connecting the cylinder pressurizing chamber and the accumulator is provided with a throttle for setting the flow passage cross-sectional area. By setting the flow passage cross-sectional area of the throttle accordingly, it is possible to adjust the damping effect on the longitudinal vibration by the accumulator.

According to the third aspect of the invention, the auxiliary accumulator is connected to the gas chamber of the accumulator through the connecting pipe, and the connecting pipe is provided with the throttle for setting the flow passage cross-sectional area. By setting the flow passage cross-sectional area by the throttle according to the strength of, by adjusting the damping effect on the longitudinal vibration by the auxiliary accumulator based on the connecting pipe and throttle, in addition to the damping effect by the hydraulic oil pipe and accumulator, There is an effect that a larger damping effect can be exhibited.

According to the fourth aspect of the invention, the flow passage cross-sectional area of the throttle is changed by the controller based on the relative moving speed of the foundation and the base-isolated object detected by the detector. The flow passage cross-sectional area of the throttle can be automatically adjusted according to the strength of vibration caused by an earthquake, and a suitable damping effect can be exhibited.

According to the fifth aspect of the present invention, there is an effect that a suitable damping effect can be exhibited without causing a concern that an excessive force is applied to the hydraulic oil pipe.

[Brief description of drawings]

FIG. 1 is a cut side view showing an example of the form of a seismic isolation device using a hydraulic cylinder of the present invention.

FIG. 2 is a cut side view showing another example of the form of the seismic isolation device using the hydraulic cylinder of the present invention.

FIG. 3 is a cut side view showing still another example of the form of the seismic isolation apparatus using the hydraulic cylinder of the present invention.

FIG. 4 is a cut side view showing still another example of the form of the seismic isolation device using the hydraulic cylinder of the present invention.

FIG. 5 is a cut side view showing still another example of the form of the seismic isolation device using the hydraulic cylinder of the present invention.

FIG. 6 is a cut side view showing an example of a conventional seismic isolation device using a hydraulic cylinder.

FIG. 7 is a cut side view showing another example of a conventional seismic isolation device using a hydraulic cylinder.

[Explanation of symbols]

1 foundation 2 laminated rubber 3 hydraulic cylinder 4 seismic isolation target 6 pistons 7 cylinders 8 cylinder pressurizing chamber 9 Hydraulic oil piping 10 Accumulator 16 aperture 17 Communication pipe 18 Auxiliary accumulator 19 aperture 20,21 detector 22 Controller

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16F 15/023 F16F 15/023 Z (72) Inventor Takahiro Shimada 1 Shinshinarahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Machinery & Plant Development Center (72) Inventor Kosuke Iwamoto 1 Shinshinarahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Machinery & Plant Development Center F-term (reference) 3J048 AA02 AB01 AB09 AC01 AC04 AD01 BA08 BE03 DA01 EA38 3J069 AA60 CC33 EE11

Claims (5)

[Claims] 1. A hydraulic cylinder in which a piston is fitted in a cylinder to form a cylinder pressurizing chamber, the cylinder pressurizing chamber being connected to an accumulator through a hydraulic oil pipe, and the cylinder being stacked on the hydraulic cylinder. A seismic isolation device using a hydraulic cylinder made of laminated rubber, wherein the hydraulic cylinder and laminated rubber are stacked in the order of laminated rubber, piston, and cylinder pressurizing chamber in order between the foundation and the seismic isolated object. A seismic isolation device using a hydraulic cylinder, characterized in that an accumulator is fixed to a base or a side of a base isolation object to which a cylinder pressurizing chamber is fixed. 2. A hydraulic cylinder in which a piston is fitted into a cylinder to form a cylinder pressurizing chamber, the cylinder pressurizing chamber being connected to an accumulator via a hydraulic oil pipe, and the cylinder being stacked on the hydraulic cylinder. A seismic isolation device using a hydraulic cylinder composed of the laminated rubber, wherein the hydraulic oil pipe is provided with a throttle for setting a flow passage cross-sectional area. 3. A hydraulic cylinder, in which a piston is fitted into a cylinder to form a cylinder pressurizing chamber, the cylinder pressurizing chamber being connected to an accumulator through a hydraulic oil pipe, and the cylinder being stacked on the hydraulic cylinder. A seismic isolation device using a hydraulic cylinder made of laminated rubber, wherein an auxiliary accumulator is connected to the accumulator via a connecting pipe, and the connecting pipe is provided with a throttle for setting a flow passage cross-sectional area. A seismic isolation device using a hydraulic cylinder. 4. A detector for detecting relative movement speed between the base and the seismic isolated object, wherein a piston of a hydraulic cylinder is attached to one of the base and the seismic isolated object and laminated rubber is fixed to the other. The seismic isolation apparatus using the hydraulic cylinder according to claim 2 or 3, further comprising a controller that changes the flow passage cross-sectional area of the throttle based on the relative movement speed detected by the detector. 5. A seismic isolation device using the hydraulic cylinder according to claim 1, wherein the seismic isolation device using the hydraulic cylinder is provided with the configuration according to any one of claims 2 to 4.