JP2002106632A - Base isolation device and base isolation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of locking vibration of a building or the like even when vertical rigidity is reduced. SOLUTION: An accumulator 55 filled with pressurizing gas 55a is connected to bottom oil chambers 53a of two base isolation devices 50, thereby exhibiting a vertical base isolation function having a small vertical rigidity. An upper oil chamber 53b of a No.1 base isolation device 50 is connected to a lower oil chamber 53c of a No.2 base isolation device 50, and a lower oil chamber 53c of the No.1 base isolation device 50 is connected to an upper oil chamber 53b of the No.2 base isolation device 50; thereby providing a cross state connection. Therefore, even when No.1 and No.2 pistons 52 apt to vertically move in the opposite phase, the cross state connection prevents the movement in the opposite phase to prevent the occurrence of the locking vibration of the building.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device and a seismic isolation structure. It is devised so that it can be prevented.

[0002]

2. Description of the Related Art In nuclear facilities and general buildings, a seismic isolation device is provided between a building or the like (an object to be protected) and the ground in order to improve earthquake resistance. The seismic isolation function of such a seismic isolation device requires a horizontal seismic isolation function that extends the natural period of the protected object in the horizontal direction, and a vertical seismic isolation function that extends the natural period of the protected object in the vertical direction. Not only that, a rocking vibration prevention function that prevents and suppresses the occurrence of rocking vibration of the object to be protected is required.

The rocking vibration will be further described.
If the floor of the building is supported by multiple seismic isolation devices with vertical seismic isolation function, if the seismic isolation devices expand and contract synchronously when an earthquake occurs, the vertical vibrations will be absorbed. The building can maintain a horizontal state. However, when one seismic isolation device extended, the other seismic isolation device contracted,
If one seismic isolation device expands when one seismic isolation device shrinks,
Rocking vibrations in which the building shakes occur. Such rocking vibration is likely to occur when a horizontal earthquake occurs.

[0004] In particular, when the natural period of the building in the vertical direction is lengthened, that is, when the spring constant of each seismic isolation device is set to be small in order to support the building softly in the vertical direction. Rocking vibration is likely to occur.

Here, a conventional seismic isolation device devised to prevent generation of rocking vibration and a seismic isolation structure constituted by combining the conventional seismic isolation device are shown in FIGS. 10 and 11.
This will be described with reference to FIG.

FIG. 10 shows an example of a conventional seismic isolation device 10. In this seismic isolation device 10, a laminated rubber 11 is fixed to the floor, and a hydraulic cylinder 12 is placed on the laminated rubber 11.
Is arranged. Cylinder outer cylinder 1 of hydraulic cylinder 12
2a is fixed to the laminated rubber 11, and the piston 12
The supporting sphere 13 is attached to b. Support sphere 1
3 is a ball seat 12c whose lower part is formed on the piston 12b.
And its upper surface is fixed to the floor surface 14 of the building, which is the object to be protected.

The oil chamber 12d of the hydraulic cylinder 12
The accumulator 16 is connected to the accumulator 16 through a high pressure gas 16a. The working oil L is filled in the oil chamber 12d, the pipe 15, and the accumulator 16.

In the seismic isolation device 10 having the above configuration,
The compressive elasticity of the high-pressure gas 16a supports a vertical load and provides a vertical restoring force to exhibit a vertical seismic isolation function. The laminated rubber 11 exhibits a horizontal seismic isolation function. Further, by supplying the hydraulic oil L to the ball seat 12c and supporting the supporting sphere 13 in a floating state with respect to the ball seat 12c, "torsion" between the cylinder cylinder 12a and the piston 12b is prevented. ing. Thus, the seismic isolation device 10
With this, three-dimensional seismic isolation can be achieved.

A conventional seismic isolation structure 20 having a locking vibration preventing function, which is constituted by combining a plurality of such seismic isolation devices 10, will be described with reference to FIG. In this seismic isolation structure 20, sixteen seismic isolation devices 10 (but not provided with the accumulator 16) are connected by pipes, and the plurality of seismic isolation devices 10 are divided into four groups (that is, 10 ( A), 10 (B), 10 (C), 10 (D)
), And each group is connected to one oil chamber of the series / directly connected cylinder 17. The in-line / direct-coupled cylinder 17 is formed by connecting through-rod cylinders in series, and accumulators 17a, 17b, 17c, and 17d in which high-pressure gas is sealed are connected to the other oil chamber. The working oil supplied by the hydraulic pump 18 is filled through the manifold 19.

By providing the piping shown in FIG. 11, that is, four groups of seismic isolation devices 10 (A), 10 (B), 10
Since (C) and 10 (D) are connected to one oil chamber of the series / directly connected cylinder 17 for each group,
The vertical displacements (vertical expansion and contraction amounts) of the respective seismic isolation devices 10 are all equal, and the occurrence of rocking vibration can be suppressed.
Also, the compression elasticity of the high-pressure gas sealed in the accumulators 17a, 17b, 17c, 17d achieves a vertical seismic isolation function.

[0011]

By the way, in the conventional seismic isolation structure 20 shown in FIG.
In order to connect the direct connection cylinder 17 and the manifold 19, the piping must be routed over a long distance,
The piping configuration is complicated, and the overall device configuration of the seismic isolation structure 20 is also complicated.

Further, since the length of the pipe is long, the rigidity of the oil column in the pipe is reduced, and the locking rigidity is reduced, so that the occurrence of rocking vibration may not be effectively suppressed.

In view of the above prior art, the present invention can reliably prevent the occurrence of rocking vibration even if the rigidity against vertical vibration is reduced and the natural period of vertical seismic isolation is increased, and the structure is simple. It is intended to provide a seismic isolation device and a seismic isolation structure.

[0014]

The structure of the seismic isolation device of the present invention which solves the above-mentioned problem is that a piston having an intermediate piston penetrates vertically and slidably, and a bottom portion is provided between the piston and a bottom surface of the piston. An oil chamber is formed, an upper oil chamber is formed between the upper oil chamber and the upper surface of the intermediate piston, and a lower oil chamber is formed between the lower oil chamber and the lower surface of the intermediate piston. A casing in which the working fluid is sealed in the lower oil chamber; and an accumulator in which the working fluid and the pressurized gas are sealed inside while being connected to the bottom oil chamber via a pipe in which the working fluid is sealed. It is characterized by having.

The seismic isolation device according to the present invention is characterized in that, in a pipe connecting the bottom oil chamber and the accumulator, the flow path of the pipe is normally shut off, and when an earthquake detection signal is input, the flow of the pipe is stopped. A lock control valve for widening the road to a preset opening is interposed.

Further, according to the seismic isolation device of the present invention, the pipe connecting the bottom oil chamber and the accumulator is provided with a flow control valve, and the flow control valve is provided in accordance with the value of the earthquake detection signal. A control circuit for controlling the opening of the regulating valve is provided.

Further, the structure of the seismic isolation device of the present invention is characterized in that a laminated rubber is provided at a lower portion of the casing.

[0018] Further, the structure of the seismic isolation device of the present invention is characterized in that a slide pad is provided at a lower portion of the casing, and a slide plate on which the slide pad is mounted is provided on a base side. .

Further, in the structure of the seismic isolation device according to the present invention, the pipe connecting the bottom oil chamber and the accumulator is provided with a supply / discharge valve and a working fluid discharged from a hydraulic pressure source. A replenishing pipe for replenishing the piston is connected, and further, a displacement meter for detecting the position of the piston, and when the position of the piston detected by the displacement meter is lower than a predetermined position, the supply / discharge valve is provided. The working fluid from the hydraulic pressure source is adjusted to flow into the pipe connecting the bottom oil chamber and the accumulator, and the position of the piston detected by the displacement meter is higher than a predetermined position. In this case, the opening degree of the supply / discharge valve was adjusted, the working fluid in the pipe connecting the bottom oil chamber and the accumulator was discharged to the outside, and the position of the piston detected by the displacement gauge was predetermined. Within a predetermined range That when, the sheet discharge valve is closed,
A leveling control device for controlling a working fluid to be prevented from flowing into and out of a pipe connecting the bottom oil chamber and the accumulator.

Further, in the structure of the seismic isolation device according to the present invention, a direct fluid supply / discharge valve is interposed in a pipe connecting the bottom oil chamber and the accumulator, and a working fluid discharged from a hydraulic pressure source is provided. The supply pipe is connected to the pipe, and the piston and the direct-acting supply / discharge valve are mechanically connected to each other by mechanical displacement transmission means to directly move according to the position of the piston. When the position of the piston is lower than a predetermined position by adjusting the opening degree of the type supply / discharge valve, a working fluid from the hydraulic pressure source is supplied to the pipe connecting the bottom oil chamber and the accumulator. If the position of the piston is higher than a predetermined position, the working fluid in the pipe connecting the bottom oil chamber and the accumulator is discharged to the outside, and the position of the piston is determined in advance. Within the prescribed range , The direct acting paper discharge valve is closed,
It is characterized in that control is performed such that the working fluid does not enter and exit the pipe connecting the bottom oil chamber and the accumulator.

In the structure of the seismic isolation structure according to the present invention, a plurality of any of the above-described seismic isolation devices are arranged, and an upper oil chamber of any one of the seismic isolation devices has a working fluid sealed therein. Connected to the lower oil chamber of the seismic isolation device other than the seismic isolation device, and the lower oil chamber of any one seismic isolation device is connected to the lower oil chamber by a pipe in which working fluid is sealed. It is characterized by being connected to the upper oil chamber of the seismic isolation device other than the seismic device.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

<First Embodiment> FIG. 1 shows a first embodiment of the present invention.
1 shows a seismic isolation device 50 according to the embodiment. In the seismic isolation device 50, the casing 5 that functions as a cylinder outer cylinder is provided.
1 with a piston 52 having an intermediate piston 52a
However, it penetrates slidably in the vertical direction. And
A bottom oil chamber 53a is formed between the bottom surface of the piston 52 and the casing 51, an upper oil chamber 53b is formed between the upper surface of the intermediate piston 52a and the casing 51, and between the lower surface of the intermediate piston 52a and the casing 51. Lower oil chamber 5
3c is formed. In addition, the upper surface of the piston 52 is fixed to the floor of the building, which is the object to be protected.

The bottom oil chamber 53a is connected to an accumulator 55 via a pipe 54. These bottom oil chambers 5
A working fluid 56 such as oil or an aqueous glycerin solution is sealed in the pipe 3a, the pipe 54 and the accumulator 55,
The accumulator 55 is filled with a pressurized gas 55a such as a nitrogen gas. The upper oil chamber 53b and the lower oil chamber 53
Pipes 57a and 57b are connected to c and are connected in a cross state to the lower oil chamber and the upper oil chamber of another seismic isolation device as in a second embodiment (see FIG. 2) described later. . The upper oil chamber 53b, the lower oil chamber 53c, and the pipes 57a, 57
A working fluid 56 is also sealed in 7b.

In such a seismic isolation device 50, when the piston 52 vertically vibrates due to the seismic vibration, the bottom oil chamber 53a
The working fluid 56 flows into and out of the accumulator 55 via the pipe 54, and compresses and expands the pressurized gas 55a. Due to the compressive elasticity of the pressurized gas 55a, a vertical load (vertical vibration) can be supported and a vertical restoring force can be provided to perform a vertical seismic isolation function.

Although the details will be described in the second embodiment, by combining the two seismic isolation devices 50 and connecting the upper oil chamber 53b and the lower oil chamber 53c in a cross state, The occurrence of rocking vibration can be suppressed.

<Second Embodiment> FIG. 2 shows a second embodiment of the present invention.
1 shows a seismic isolation structure 100 according to an embodiment. This seismic isolation structure 100 is configured by combining two seismic isolation devices 50. The upper oil chamber 5 of the first (No1) seismic isolation device 50 and the second (No2) seismic isolation device 50
3b and the lower oil chamber 53c are connected in a cross state by pipes 57a and 57b. That is, the upper oil chamber 53b of the No. 1 seismic isolation device 50 and the lower oil chamber 53c of the No. 2 seismic isolation device 50 are connected by the pipe 57a.
The lower oil chamber 53c of the first seismic isolation device 50 and the upper oil chamber 53b of the No. 2 seismic isolation device 50 are connected by a pipe 57b. The configuration of the other parts is the same as that shown in FIG.

In such a seismic isolation structure 100, No. 1
When the piston 52 of the seismic isolation device 50 moves downward,
The working fluid 56 in the lower oil chamber 53c on the o1 side
b, flows into the upper oil chamber 53b of the seismic isolation device 50 of No. 2 and pushes the piston 52 of No. 2 downward.
When the piston 52 of the seismic isolation device 50 of No. 1 moves upward, the working fluid 56 in the upper oil chamber 53b on the No. 1 side.
Flows into the lower oil chamber 53c of the No. 2 seismic isolation device 50 via the pipe 57a, and pushes the No. 2 side piston 52 upward. Therefore, the No. 1 and No. 2 seismic isolation devices 50
Generate no resistance when oscillating in phase with N
Only the reaction force of the bottom oil chamber 53a is applied to the piston 52 on the o1 side and the piston 52 on the No2 side.

No. 1 seismic isolation device 50 due to locking
When the force for moving the piston 52 of the No. 2 seismic device downward and the piston 52 of the No. 2 seismic isolation device acts upward, N
The working fluid 56 in the lower oil chamber 53c on the o1 side is connected to a pipe 57b.
And the working fluid in the upper oil chamber 53b on the No. 2 side also tries to flow out to the pipe 57b. Therefore, the working fluid 56 in the pipe 57b is compressed, and the piston 52 and the N on the No. 1 side are compressed.
A large reaction force is generated in the piston 52 on the o2 side. Conversely, locking occurs and the piston 52 of the No. 1 seismic isolation device 50
When the force to move the piston 52 of the seismic isolation device of No. 2 downward is applied, the working fluid 56 in the upper oil chamber 53b on the No. 1 side flows out to the pipe 57a,
Since the working fluid in the lower oil chamber 53c on the second side also tries to flow out to the pipe 57a, the working fluid 56 in the pipe 57a is compressed, and a large reaction force is generated in the piston 52 on the No1 side and the piston 52 on the No2 side. .

As a result, the No. 1 seismic isolation device 50 and the No.
The second seismic isolation device 50 generates a large resistance to vibrating in mutually opposite phases, and can suppress the occurrence of rocking vibration. Moreover, the No. 1 seismic isolation device 50 and N
Since only the upper oil chamber 53b and the lower oil chamber 53c of the o2 seismic isolation device 50 are connected in a cross state by the pipes 57a and 57b, the length of the pipes is as shown in FIG.
1 is shorter than the seismic isolation structure 20 shown in FIG. For this reason,
The structure of the seismic isolation device 50 as a whole is simplified, and the rigidity of the oil column in the pipes 57a and 57b is hardly reduced, so that the occurrence of rocking can be surely suppressed.

In the seismic isolation device 50 for isolating vertical vibration,
(1) In order to set the natural frequency of vertical vibration of the building (object to be protected) sufficiently lower than the dominant frequency, when the seismic isolation device 50 vibrates in phase, the building is supported with low rigidity, ) In order to suppress the rocking vibration of the building, if the seismic isolation device 50 attempts to vibrate in the opposite phase, it is necessary to have high rigidity and to resist the opposite phase vibration.

(1) In general, the rigidity of the pressurized gas 55a is much smaller than the rigidity of the working fluid 56. Therefore, when the two seismic isolation devices 50 vibrate in the same direction in the vertical direction, the seismic isolation device 50 (2) When the two seismic isolation devices 50 vibrate simultaneously in opposite phases, it is necessary to compress the working fluid 56 having high rigidity. High rigidity can be realized.

<Third Embodiment> FIG. 3 shows a third embodiment of the present invention.
1 shows a seismic isolation structure 110 according to the embodiment. This seismic isolation structure 110 is configured by combining four seismic isolation devices 50. The four seismic isolation devices 50 are arranged at four corners of the floor of the building (protective structure). And the first (No
1) Seismic isolation device 50 to 4th (No. 4) seismic isolation device 50
The upper oil chamber 53b and the lower oil chamber 53c are sequentially connected in a cross state by pipes 57a, 57b, 57c and 57d.

That is, (1) the upper oil chamber 53b of the No. 1 seismic isolator 50 and the lower oil chamber 53c of the No. 2 seismic isolator 50 are connected by the pipe 57a, and (2) the No. 2 seismic isolator The upper oil chamber 53b of No. 50 and the lower oil chamber 53c of the No. 3 seismic isolation device 50 are connected by a pipe 57b.
The lower oil chamber 53c of the No. 4 seismic isolation device 50 is connected by a pipe 57c. (4) The upper oil chamber 53b of the No. 4 seismic isolation device 50 and the lower oil chamber 53c of the No. 1 seismic isolation device 50 are connected. , Are connected by a pipe 57d.

With such a connection structure, vertical vibrations can be absorbed and resistance to rocking vibrations in any direction can be exerted. The number of connected seismic isolation devices 50 is not limited to four, but may be three or five or more.

<Fourth Embodiment> FIG. 4 shows a fourth embodiment of the present invention.
The seismic isolation device 50A according to the embodiment is shown. In this seismic isolation device 50A, the bottom oil chamber 53a and the accumulator 55
A lock control valve 61 is interposed in the pipe 54 connecting The opening and closing control of the lock control valve 61 is performed by:
This is performed by the earthquake detection device 62. That is, the lock control valve 61 normally shuts off almost the flow path of the pipe 54, and is set in a state where the flow path is formed through a minute through hole of the valve body or a narrow bypass pipe, and the seismic detector When the earthquake detection signal from 62 is input, the flow path in the pipe 54 is expanded to the set opening and connected.

The earthquake detecting device 62 has a built-in device for detecting a seismic motion such as a seismometer and has a structure for generating a seismic detecting signal when detecting a seismic motion of a predetermined size, or a seismic detecting signal from an external device such as a network. And sends an earthquake detection signal to the lock control valve 61.

The structure of the other parts is the same as that of the seismic isolation device 50 shown in FIG. 1. A plurality of seismic isolation devices 50A are combined and connected as shown in FIGS. A seismic isolation structure that suppresses occurrence can be configured.

When this seismic isolation device 50A is applied as floor seismic isolation, the ratio of the load that changes depending on the use form such as people or equipment on the floor is higher than the weight of the building (object to be protected). There is a problem that the floor vibrates when a person walks if it is supported with low rigidity. Therefore, when the lock control valve 61 is almost closed except during an earthquake, the working fluid 56 in the bottom oil chamber 53a cannot move, and exhibits high rigidity. There is no. On the other hand, during an earthquake, the lock control valve 6
Since 1 is open, required seismic isolation performance can be obtained.

<Fifth Embodiment> FIG. 5 shows a fifth embodiment of the present invention.
5 shows a seismic isolation device 50B according to the embodiment. In this seismic isolation device 50B, the bottom oil chamber 53a and the accumulator 55
A flow control valve 63 is interposed in the middle of a pipe 54 connecting The flow control valve 63 is normally set to a state in which the flow path of the pipe 54 is almost shut off and the flow path is formed through a minute through hole of the valve body or a narrow bypass pipe. From the control circuit 6
In step 4, the flow path in the pipe 54 is connected at a predetermined valve opening according to an opening command issued by the control circuit 64.

The control circuit 64 changes the valve opening command every moment according to the seismic motion in accordance with a predetermined control law, and changes the opening of the flow regulating valve 63. That is, when the value of the earthquake detection signal sent from the earthquake detection device 62 is small, the valve opening of the flow control valve 63 is decreased, and as the value of the earthquake detection signal increases, the valve opening of the flow control valve 63 is increased. The control operation is performed so as to increase.

The structure of the other parts is the same as that of the seismic isolation device 50 shown in FIG. 1, and a plurality of seismic isolation devices 50B are combined and connected as shown in FIGS. A seismic isolation structure that suppresses occurrence can be configured.

This seismic isolation device 50B is used for
The same effect as that of the seismic isolation device 50A (see FIG. 4) is exerted. When an earthquake occurs, the flow resistance of the flow control valve 63 changes with time according to the movement of the piston 52, so that a greater seismic isolation effect can be obtained as compared with a case where a constant (fixed) flow resistance is given. .

<Sixth Embodiment> FIG. 6 shows a sixth embodiment of the present invention.
2 shows a seismic isolation structure 100A according to the embodiment. This seismic isolation structure 100A is an improvement of the seismic isolation structure 100 shown in FIG.

As shown in FIG. 6, displacement gauges 71 for detecting the positions of the pistons 52 are arranged on the casings 51 of the No. 1 and No. 2 seismic isolation devices 50, respectively. The hydraulic pressure source 72 is provided with a supply pipe 7 in which a supply / discharge valve 73 is interposed.
4 is connected to the piping 54 on the No1 side and the No2 side. When the position of the piston 52 detected by each displacement meter 71 is lower than a predetermined position, each leveling control device 75 controls the opening degree of the supply / discharge valve 73 to discharge from the hydraulic pressure source 72. When the position of the piston 52 detected by the displacement meter 71 is higher than a predetermined position, the supply / discharge valve 73 is supplied.
Is controlled to discharge the working fluid 56 in the pipe 54 to the drain pipe 76. Each leveling control device 75
When the position of the piston 52 enters a predetermined range, the supply / discharge valve 73 is closed, and the hydraulic pressure source 72 and the drain pipe 76
Eliminates the inflow and outflow of the working fluid 56 to and from the pipe 54.

When a device such as a crane whose load greatly changes is seismically isolated, the rigidity in the vertical direction is low, so that the position of the piston changes due to the load fluctuation, and when the unbalanced load is applied for a long period of time, the object to be protected is protected. Although there is a problem that an object tilts, if the seismic isolation structure 100A according to the present embodiment is used, even if the load applied to each seismic isolation device 50 is different, the height of each seismic isolation device 50 is kept constant. Can be maintained without adversely affecting the operation of equipment such as cranes.

<Seventh Embodiment> FIG. 7 shows a seventh embodiment of the present invention.
5 shows a seismic isolation structure 100B according to the embodiment. This seismic isolation structure 100B includes a seismic isolation structure 100A shown in FIG.
Since this is a modified example, the modified part will be described.

As shown in FIG. 7, the hydraulic pressure source 72 and the No. 1
A direct-acting supply / discharge valve 77 is interposed in the supply pipe 74 connecting the pipe 54 of the seismic isolation device 50 of No. 2 and No. 2, respectively. Each direct acting supply / discharge valve 77 and each piston 52
They are connected by a displacement transmitting mechanism 78 which is a mechanical connecting means such as an arm and a link. Therefore, each piston 5
2 is a direct-acting supply / discharge valve 77 via a displacement transmission mechanism 78.
And the valve opening of the direct acting supply / discharge valve 77 is adjusted.

That is, when the position of the piston 52 is lower than a predetermined position, the opening degree of the direct-acting supply / discharge valve 77 is controlled to supply the working fluid 56 discharged from the hydraulic pressure source 72 to the piping. When the position of the piston 52 is higher than a predetermined position, the opening degree of the direct-acting supply / discharge valve 77 is controlled so that the working fluid 56 in the pipe 54 is supplied to the drain pipe 7.
Discharge to 6. When the position of the piston 52 falls within a predetermined range, the direct-acting supply / discharge valve 77 is closed and the hydraulic pressure source 72 is closed.
And the working fluid 5 between the drain pipe 76 and the pipe 54
Eliminate the entry and exit of 6.

In the seventh embodiment, the same effects as in the sixth embodiment can be obtained at low cost.

<Eighth Embodiment> FIG. 8 shows an eighth embodiment of the present invention.
The seismic isolation device 50C according to the embodiment is shown. The seismic isolation device 50C has a structure in which a laminated rubber 81 is installed below the seismic isolation device 50 shown in FIG.

The structure of the other parts is the same as that of the seismic isolation device 50 shown in FIG. 1. A plurality of seismic isolation devices 50C are combined and connected as shown in FIGS. A seismic isolation structure that suppresses occurrence can be configured.

Since the laminated rubber 81 has low rigidity in the horizontal direction, it exerts a seismic isolation effect against a horizontal earthquake. Since the laminated rubber 81 is rigid in the vertical direction, it does not hinder the vertical seismic isolation function as the seismic isolation device. This enables horizontal, vertical, and three-dimensional seismic isolation.

<Ninth Embodiment> FIG. 9 shows a ninth embodiment of the present invention.
5 shows a seismic isolation device 50D according to the embodiment. In this seismic isolation device 50D, a sliding pad 82 having a low coefficient of friction is installed below the seismic isolation device 50 shown in FIG. 1, a sliding plate 83 is installed on the base side, and the sliding pad 82 is placed on the sliding plate 83. Placed. The sliding plate 83 has a size that does not hinder the movement range of the sliding pad 82 during an earthquake.

The structure of the other parts is the same as that of the seismic isolation device 50 shown in FIG. 1. A plurality of seismic isolation devices 50D are combined and connected as shown in FIGS. A seismic isolation structure that suppresses occurrence can be configured.

For a seismic load exceeding the coefficient of friction between the sliding pad 82 and the sliding plate 83 for a horizontal earthquake, slippage occurs and the seismic load is not transmitted, so that a seismic isolation effect against a horizontal earthquake is exhibited. Sliding pad 82 and sliding plate 83
Is rigid in the vertical direction, and does not hinder the vertical seismic isolation function of the seismic isolation device. This enables horizontal, vertical, and three-dimensional seismic isolation.

[0057]

As described above in detail with the embodiments, in the seismic isolation device of the present invention, the piston having the intermediate piston penetrates vertically so as to be slidable, and is interposed between the piston and the bottom surface of the piston. A bottom oil chamber is formed, an upper oil chamber is formed with an upper surface of the intermediate piston, a lower oil chamber is formed with a lower surface of the intermediate piston, and the bottom oil chamber, the upper oil chamber, and An accumulator connected to the bottom oil chamber via a casing in which the lower oil chamber is filled with a working fluid and a pipe filled with the working fluid, and in which a working fluid and a pressurized gas are sealed inside And a configuration having:

With this configuration, the upper and lower seismic isolation functions can be achieved by connecting the upper oil chamber and the lower oil chamber of the plurality of seismic isolation devices in a crossed state, thereby reliably suppressing the occurrence of rocking vibration. be able to.

Further, in the seismic isolation device of the present invention, the pipe connecting the bottom oil chamber and the accumulator normally shuts off the flow path of the pipe, and when an earthquake detection signal enters, the flow path of the pipe is cut off. A lock control valve that expands to a preset opening is interposed, or a pipe that connects the bottom oil chamber and the accumulator is provided with a flow control valve, and the value of the earthquake detection signal is reduced. A control circuit for controlling the opening of the flow control valve accordingly is provided.

With this configuration, it is possible to increase the rigidity during the normal operation to support the vehicle, while it is possible to reliably suppress the occurrence of rocking vibration during the occurrence of an earthquake.

Further, in the seismic isolation device of the present invention, a laminated rubber is provided at a lower portion of the casing, a sliding pad is provided at a lower portion of the casing, and a sliding plate on which the sliding pad is mounted is a base. It was configured to be installed on the side.

With this configuration, a horizontal seismic isolation function can be exhibited, and three-dimensional seismic isolation can be realized.

In the seismic isolation device of the present invention, a supply / discharge valve is interposed in a pipe connecting the bottom oil chamber and the accumulator, and a working fluid discharged from a hydraulic pressure source is supplied to the pipe. And a displacement meter for detecting the position of the piston, and when the position of the piston detected by the displacement meter is lower than a predetermined position, the supply / discharge valve is opened. When the working fluid from the hydraulic pressure source is adjusted to flow into the pipe connecting the bottom oil chamber and the accumulator, and the position of the piston detected by the displacement meter is higher than a predetermined position, Adjusts the opening degree of the supply / discharge valve, discharges the working fluid in the pipe connecting the bottom oil chamber and the accumulator to the outside, and the position of the piston detected by the displacement meter is a predetermined predetermined value. Fall within range A leveling control device that closes the supply / discharge valve and controls the flow of the working fluid into and out of the pipe connecting the bottom oil chamber and the accumulator, or the bottom oil chamber and the accumulator. The connecting pipe is provided with a direct-acting supply / discharge valve, and is connected with a supply pipe for supplying working fluid discharged from a hydraulic pressure source to the pipe. By mechanically connecting the piston and the direct-acting supply / discharge valve to adjust the opening of the direct-acting supply / discharge valve according to the position of the piston, the position of the piston becomes higher than a predetermined position. If low, the working fluid from the hydraulic source is
When the position of the piston is higher than a predetermined position, the working fluid in the pipe connecting the bottom oil chamber and the accumulator flows into the pipe side connecting the bottom oil chamber and the accumulator. When the piston is discharged to the outside and the position of the piston is within a predetermined range, the direct-acting supply / discharge valve is closed to allow the working fluid to flow into and out of a pipe connecting the bottom oil chamber and the accumulator. Is configured to be controlled.

With this configuration, the object to be protected can be supported horizontally even if an eccentric load acts for a long period of time.

In the seismic isolation structure of the present invention, a plurality of any of the above-described seismic isolation devices are arranged, and an upper oil chamber of any one of the seismic isolation devices has a pipe in which a working fluid is sealed. Is connected to the lower oil chamber of the seismic isolation device other than the seismic isolation device, and the lower oil chamber of any one seismic isolation device is connected to the seismic isolation device by a pipe in which the working fluid is sealed. It was configured to be connected to the upper oil chamber of the seismic isolation device other than.

With this configuration, it is possible to reliably prevent the occurrence of rocking vibration by utilizing the rigidity of the working fluid. In addition, the length of the piping is shortened, the configuration of the entire seismic isolation structure is simplified, and the rigidity of the oil column in the piping is hardly reduced, so that the occurrence of rocking vibration can be surely suppressed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a seismic isolation device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a seismic isolation structure according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a seismic isolation structure according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a seismic isolation device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a seismic isolation device according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a seismic isolation structure according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram showing a seismic isolation structure according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram showing a seismic isolation device according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram showing a seismic isolation device according to a ninth embodiment of the present invention.

FIG. 10 is a configuration diagram showing a conventional seismic isolation device.

FIG. 11 is a configuration diagram showing a conventional seismic isolation structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Seismic isolation device 11 Laminated rubber 12 Hydraulic cylinder 13 Supporting sphere 14 Floor surface 15 Piping 16 Accumulator 17 Series / directly connected cylinder 18 Hydraulic pump 19 Manifold 20 Seismic isolation structure 50, 50A, 50B, 50C, 50D Seismic isolation device 51 Casing 52 Piston 52a Intermediate piston 53a Bottom oil chamber 53b Upper oil chamber 53c Lower oil chamber 54 Piping 55 Accumulator 55a Pressurized gas 56 Working fluid 57a, 57b, 57c, 57d Piping 61 Control valve for locking 62 Earthquake detector 63 Flow control valve 64 Control Circuit 71 Displacement gauge 72 Hydraulic pressure source 73 Supply / discharge valve 74 Supply pipe 75 Leveling control device 76 Drain pipe 77 Direct-acting supply / discharge valve 78 Displacement transmission mechanism 81 Laminated rubber 82 Sliding pad 83 Sliding plate 100, 100A, 100B, 110 Seismic isolation structure Body L hydraulic oil

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16F 9/50 F16F 9/50 15/04 15/04 E (72) Inventor Kazunari Wada Kobe, Hyogo Prefecture 1-1-1 Wadazakicho, Hyogo-ku Mitsubishi Heavy Industries, Ltd. Kobe Shipyard F-term (reference) 3J048 AA02 AB07 AB08 BA08 BE02 BE03 CB01 CB09 DA01 EA38 3J069 AA34 CC34 DD39 EE32 EE63

Claims (8)

[Claims] 1. A piston having an intermediate piston penetrates slidably in a vertical direction, forms a bottom oil chamber with a bottom surface of the piston, and forms an upper oil chamber with an upper surface of the intermediate piston. A casing in which a lower oil chamber is formed between the lower oil chamber and the lower surface of the intermediate piston, and a working fluid is sealed in the bottom oil chamber, the upper oil chamber, and the lower oil chamber; And an accumulator which is connected to the bottom oil chamber via a piping and has a working fluid and a pressurized gas sealed therein. 2. The pipe according to claim 1, wherein the pipe connecting the bottom oil chamber and the accumulator normally shuts off the flow path of the pipe and sets a flow path of the pipe in advance when an earthquake detection signal is input. A seismic isolation device, which is provided with a lock control valve that extends to a specified opening. 3. The flow control valve according to claim 1, wherein a flow control valve is interposed in a pipe connecting the bottom oil chamber and the accumulator, and the flow control valve is opened according to a value of the earthquake detection signal. A seismic isolation device having a control circuit for controlling the degree. 4. The seismic isolation device according to claim 1, wherein a laminated rubber is provided below the casing. 5. The seismic isolation device according to claim 1, wherein a sliding pad is provided at a lower portion of the casing, and a sliding plate on which the sliding pad is mounted is provided on a base side. 6. A refill according to claim 1, wherein a supply / discharge valve is interposed in a pipe connecting the bottom oil chamber and the accumulator, and a working fluid discharged from a hydraulic pressure source is supplied to the pipe. And a displacement meter for detecting the position of the piston, and when the position of the piston detected by the displacement meter is lower than a predetermined position, the opening of the supply / discharge valve is adjusted. When the working fluid from the hydraulic pressure source is adjusted to flow into the pipe connecting the bottom oil chamber and the accumulator, and the position of the piston detected by the displacement meter is higher than a predetermined position, By adjusting the opening of the supply / discharge valve, the working fluid in the pipe connecting the bottom oil chamber and the accumulator is discharged to the outside, and the position of the piston detected by the displacement meter is within a predetermined range. When entering, before Supplying the discharge valve is closed, the seismic isolation device characterized by and a leveling control unit for controlling so as to eliminate the out of the working fluid into the piping connecting the said bottom oil chamber accumulator. 7. The pipe according to claim 1, wherein a direct-acting supply / discharge valve is interposed in a pipe connecting the bottom oil chamber and the accumulator, and a working fluid discharged from a hydraulic pressure source is supplied to the pipe. A replenishing pipe for replenishing is connected, and further, the piston and the direct-acting supply / discharge valve are mechanically connected by a mechanical displacement transmitting means, and the direct-acting supply / discharge valve is operated in accordance with the position of the piston. By adjusting the opening of the piston, when the position of the piston is lower than a predetermined position, the working fluid from the hydraulic pressure source is caused to flow into a pipe side connecting the bottom oil chamber and the accumulator. If the position of the piston is higher than a predetermined position, the working fluid in the pipe connecting the bottom oil chamber and the accumulator is discharged to the outside, and the position of the piston is within a predetermined range. Once inside, The Shikikyu discharge valve is closed, said bottom seismic isolation device and controlling so as to eliminate the out of the working fluid to the oil chamber piping connecting the accumulator. 8. A plurality of seismic isolation devices according to any one of claims 1 to 7, wherein a working fluid is sealed in an upper oil chamber of any one of the seismic isolation devices. Piping is connected to the lower oil chamber of the seismic isolation device other than the seismic isolation device, and the lower oil chamber of any one seismic isolation device is connected to the seismic isolation A seismic isolation structure connected to an upper oil chamber of a seismic isolation device other than the device. .