JPH05332047A - Base isolation device - Google Patents

Abstract

PURPOSE:To suppress any shaking on vibratory movement in any mode caused by earthquake applied to a structure of which base is isolated. CONSTITUTION:In base isolation device 7 which is interposed between a base 2 and a structure 5 and which can absorb the energy of shaking on oscillation of the ground, a lower flange 9 is connected to the base 2 and an upper flange 9a is connected to the structure 5. A cylinder is composed of doughnut-like steel discs 9d and doughnut-like resilient discs 9e which are alternately stacked one upon another. A damper body 9c charged therein with electric viscous fluid 9i, is provided so that the lower and upper flanges 9b, 9a may be positionally shifted from each other in a horizontal direction, and the electric viscous fluid 9i may be deformed. Further, an energizing device 10 for creating an electric field in the damper body 9c and the electric viscous fluid 9i is connected thereto with a voltage control device 11 for controlling the intensity of the field, which is in turn connected thereto with an oscillation sensor 12 for detecting oscillation.

Description

Detailed Description of the Invention

[0001]

[Industrial application] In a base-isolated structure that uses a laminated rubber to elastically support the structure with respect to the foundation, and a damper that absorbs vibrations that occur in the structure due to an earthquake, etc. The present invention relates to a seismic isolation device used to absorb generated vibrations.

[0002]

2. Description of the Related Art Recently, as a means for absorbing vibration energy such as an earthquake in a seismic isolation structure, a seismic isolation device using a viscoelastic damper having a viscoelastic body capable of absorbing the vibration energy has been proposed. ..

[0003]

However, even if it is generally called an earthquake, there are various vibration modes such as size and period, and originally, the vibration energy is most preferably absorbed according to the vibration mode. There is a viscosity to each of them. Therefore, in order to improve the high seismic isolation effect against various earthquakes,
Dampers with different viscosities must be used depending on the vibration mode of the earthquake that occurred. However, the conventionally proposed seismic isolation device has only a damper having a specific viscosity. Therefore, in such a seismic isolation device, there is a problem that it is not always possible to perform suitable seismic isolation against various vibrations occurring in the seismic isolation structure.

[0004]

In view of the above circumstances, the present invention provides a seismic isolation device capable of suitably isolating a seismic isolation structure, even if the seismic isolation structure causes an earthquake. Is intended to provide. The present invention is a seismic isolation device (7) that is provided between a foundation (2) and a structure (5) supported by the foundation (2) and that can absorb the vibration energy of ground vibration such as an earthquake. In the structure connection member (9a), which has a base connection member (9b) connectable to the base (2), and can be connected to the structure (5) at a position facing the base connection member (9b). ) Is provided, and the electrorheological fluid (9) whose viscosity changes between the basic connection member (9b) and the structure connection member (9a) depending on the strength of the applied electric field.
The body (9c) in which i) is filled is arranged such that the base connection member (9b) and the structure connection member (9a) can be relatively displaced in the horizontal direction, and at that time, the body is connected. (9c) is provided so that the electrorheological fluid (9i) filled inside the body (9c) can be deformed, and an electric field is formed in the electrorheological fluid (9i). Obtaining electric field forming means (9j, 9k, 9l, 9
m, 10) and the electric field forming means (9j, 9k, 9)
1, 9 m, 10) is connected to an electric field control means (11) capable of controlling the strength of the electric field, and the electric field control means (11) is connected.
Is connected to a vibration detecting means (12) capable of detecting the vibration. The numbers in parentheses () indicate the corresponding elements in the drawings for the sake of convenience, and therefore the present description is not limited to the description in the drawings. The same applies to the column of "action" below.

[0005]

With the above-described structure, the present invention forms an electric field in the electrorheological fluid (9i) by the electric field forming means (9j, 9k, 9l, 9m, 10), and the electric field forms the electrorheological fluid (9i). It acts to change the viscosity.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a seismic isolation structure using the seismic isolation device of the present invention. FIG. 2 is a diagram showing an embodiment of the seismic isolation device of the present invention. FIG. 3 is a sectional view of the variable viscoelastic damper 9 shown in FIG. 2 taken along the XY section. As shown in FIG. 1, the seismic isolation structure 1 has a foundation 2 constructed on the ground, and a structure 5 is provided on the foundation 2 with a plurality of known laminated rubber supports 6 interposed therebetween. It is elastically supported. The seismic isolation device 7 of the present invention is provided between the structure 5 and the foundation 2.
The seismic isolation device 7 has a variable viscoelastic damper 9 provided to connect the structure 5 and the foundation 2. As shown in FIG. 2, the variable viscoelastic damper 9 has a disk-shaped upper flange 9a connected to the structure 5 and a disk-shaped lower flange 9b connected to the foundation 2 as well. A damper main body 9c formed in a cylindrical shape is provided between 9a and the lower flange 9b. Damper body 9c
Is a plurality of steel plates 9 shaped like a donut disc
d and a plurality of elastic plates 9e, which are also made of an elastic material such as rubber and are formed into a donut disk shape, are laminated alternately to form an elastic cylinder 9f, which has a cylindrical shape. A closed space 9g is formed by the upper flange 9a and the lower flange 9b that are sandwiched from above and below the elastic cylinder 9f.
On the inner peripheral surface of the elastic cylinder 9f and the surfaces of the upper and lower flanges 9a and 9b in contact with the closed space 9g, an insulating layer 9h formed of a material having elasticity and insulating properties such as rubber forms a cylindrical container. It is in close contact with the closed space 9g,
The inside of the insulating layer 9h is filled with an electrorheological fluid 9i that changes its viscosity when an electric field is applied. Also, the elastic tube 9
As shown in FIGS. 2 and 3, a plurality of donut disk-shaped steel plates 9d among the inner peripheral surfaces of f are provided with positive electrodes 9j that form an arc through an insulating layer 9h. Similarly, negative electrodes 9k forming an arc are attached to the respective steel plates 9d in a pair so as to face each other.
A hole 9h1 is provided in the insulating layer 9h at the center of the portion where the positive electrode 9j is in close contact. On the steel plate 9d,
A hole 9d1 communicating with the hole 9h1 is formed so as to penetrate from the inner peripheral surface to the outer peripheral surface of the steel plate 9d.
A cable 9l covered with an insulating material is fitted and inserted in 1 and the hole 9h1, and is connected to the plus electrode 9j. Further, the insulating layer 9h is provided with a hole 9h2 at the center of the portion where the negative electrode 9k is in close contact with the steel plate 9d.
Has a hole 9d2 communicating with the hole 9h2 and a steel plate 9d.
Is formed so as to penetrate from the inner peripheral surface to the outer peripheral surface. A cable 9m covered with an insulating material is fitted into the holes 9d2 and 9h2 and connected to the negative electrode 9k. The other end of the cable 9l and the other end of the cable 9m are connected to the power supply device 10. Connected. The power supply device 10 includes
The voltage control device 11 is connected, and the vibration control sensor 12 installed on the foundation 2 is connected to the voltage control device 11.

Since the seismic isolation device 7 and the like have the above-described structure, the variable viscoelastic damper 9 has the upper flange 9
a, elastic plates 9e connecting the plurality of steel plates 9d and the lower flange 9b are elastically deformable,
Since the electrorheological fluid 9i filled in the variable viscoelastic damper 9 can also be deformed, the upper flange 9a connected to the structure 5 and the lower flange 9b connected to the foundation 2 are horizontal, that is, in FIG. It is relatively movable in the directions of arrows A and B. In addition, as shown in FIG. 2, the voltage applying device 10 applies a voltage to a plus electrode 9j and a minus electrode 9k, which are attached in such a manner as to sandwich the electrorheological fluid 9i filled in the variable viscoelastic damper 9 and face each other. E can be added, whereby an electric field that forms a horizontal disk-shaped region F is parallel to the electrorheological fluid 9i in the electrorheological fluid 9i between the plus electrode 6 and the minus electrode 7. Can be formed in plural. Then, the electrorheological fluid 9i in the region F where the electric field is formed connects the fine particles contained in the electrorheological fluid 9i dispersed in a chain by the electric field to form a cluster of fine particles. Then, the electrorheological fluid 9i in the region F can apparently improve the viscosity by the plurality of chain clusters. In addition, since the formation of clusters by connecting the fine particles is actively performed in proportion to the strength of the electric field, that is, the strength of the applied voltage E, the viscosity of the electrorheological fluid 9i in the region F is the strength of the electric field. That is, it is increased in proportion to the strength of the applied voltage E. Therefore, the power supply device 10
By changing the strength of the electric field applied to the electrorheological fluid 9i with the plus electrode 9j and the minus electrode 9k, the viscosity of the electrorheological fluid 9i can be freely changed. In addition, as shown in FIG. 2, an insulating layer formed of a material having elasticity and insulation such as rubber is provided on the inner peripheral surface of the elastic cylinder 9f and the surfaces of the upper and lower flanges 9a and 9b in contact with the closed space 9g. 9h is in close contact with the steel plate 9d so as to form a cylindrical container, and the cables 9l and 9m inserted into the holes 9d1 and 9d2 of the steel plate 9d are covered with an insulating material. Therefore, the plus electrode 9j and the minus electrode 9k are not short-circuited. Therefore, first, in a normal state, since no vibration is generated in the foundation 2 shown in FIG. 2, an electric field is not formed in the electrorheological fluid 9i inside the variable viscosity damper 9 and the electrorheological fluid 9i is not formed. Has a very low viscosity. Next, when the foundation 2 shown in FIG. 2 vibrates in the horizontal direction, that is, in the directions of arrows A and B in FIG. 1 in the event of an earthquake or the like, first, since the vibration sensor 12 is attached to the foundation 2, The sensor 12 can detect the vibration of the foundation 2, and the vibration sensor 12
As shown in FIG. 2, the vibration control signal S is sent to the voltage control device 11.
1 is output. Then, the voltage control device 10 instantly recognizes the vibration mode of the foundation 2 based on the vibration detection signal S1, and issues the applied voltage command S2 to the power supply device 10 in a form capable of absorbing the vibration energy most effectively. You can Then, based on the applied voltage command S2, the power supply device 10 sandwiches the electrorheological fluid 9i filled in the variable viscoelastic damper 9 with the positive electrode 9j and the negative electrode 9k attached to face each other. The applied voltage E is applied so that the energy can be absorbed most effectively. Then, an electric field is formed in the electrorheological fluid 9i so as to form a horizontal disc-shaped region F, so that the electrorheological fluid 9i in the region F has a viscosity capable of absorbing the vibration energy most effectively. Can be improved. Therefore, the variable viscoelastic damper 9 having the electrorheological fluid 9i filled therein suitably absorbs the vibration energy of the vibration generated in the foundation 2, and the laminated rubber support 6 and the variable viscosity damper 9 are provided on the foundation 2. The vibration can be prevented from propagating to the constructed structure 5.

As described above, according to the present invention,
In a seismic isolation device 7 provided between the foundation 2 and the structure 5 supported by the foundation 2 and capable of absorbing the vibration energy of ground vibration such as an earthquake, a lower flange 9b connectable to the foundation 2 And other structural connection members such as an upper flange 9a that can be connected to the structural body 5 are provided at positions facing the basic connection members, and the basic connection members and the structural connection members are connected to each other. In between, a body such as a damper body 9c having an electro-rheological fluid 9i whose viscosity changes according to the strength of an applied electric field is positioned relative to the base connection member and the structure connection member in the horizontal direction. The electrorheological fluid 9i, which is filled with the body so that the electrorheological fluid 9i can be deformed, can be displaced so that an electric field is formed in the electrorheological fluid 9i. Possible electrical equipment An electric field forming means such as 10 is provided, and an electric field controlling means such as a voltage control device 11 capable of controlling the strength of the electric field is connected to the electric field forming means, and the electric field controlling means has a vibration capable of detecting the vibration. Since the vibration detecting means such as the sensor 12 is connected, the base connecting member such as the lower flange 9b can be connected to the base 2, and the structure connecting member such as the upper flange 9a can be connected to the structure 5. Foundation 2
With the horizontal displacement of the structure 5, the structure connecting member and the base connecting member can be similarly displaced. In addition, the electrorheological fluid 9i filled in the body of the damper body 9c or the like is deformed as the body is deformed due to the displacement of the structure connection member and the base connection member. At this time, the electrorheological fluid 9i
Has a viscosity, so that when the electrorheological fluid 9i is deformed, the viscosity can absorb the energy of the positional deviation between the foundation 2 and the structure 5d. Therefore, when the foundation 2 and the structure 5d generate a tremor in the form of a relative positional displacement in the horizontal direction due to the tremor of the ground, the tremor energy can be absorbed by the electrorheological fluid 9i. The structure 5 can be isolated. Further, the vibration mode of the ground can be detected by the vibration detection means such as the vibration sensor 12, and the vibration energy of the vibration can be detected by the electric field control means such as the voltage control device 11 based on the detected vibration mode of the ground. The electric field forming means can be controlled so as to form an electric field having a strength that can be absorbed most preferably. Then, the electric field forming means forms an electric field in the electrorheological fluid 9i under the control of the electric field control means, so that the electric field causes the viscosity of the electrorheological fluid 9i to be the most vibration energy of the vibration. The viscosity can be suitably absorbed. Therefore, the seismic isolation apparatus 7 of the present invention can properly absorb the seismic energy and seismic the structure 5 no matter what seismic vibration occurs in the ground, that is, the foundation 2.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a seismic isolation structure using the seismic isolation device of the present invention.

FIG. 2 is a diagram showing an embodiment of the seismic isolation device of the present invention.

FIG. 3 is an XY diagram of the variable viscoelastic damper 9 shown in FIG.
It is sectional drawing cut | disconnected by the cross section.

[Explanation of symbols]

 2 ... Foundation 5 ... Structure 7 ... Seismic isolation device 9a ... Structure connection member (upper flange) 9b ... Foundation connection member (lower flange) 9c ... Body (damper body) 9i ... Electrorheological fluid 9j ... Electric field forming means (plus electrode) 9k ... Electric field forming means (minus electrode) 9l ... Electric field forming means (cable) 9m ... Electric field forming means (cable) 10 ... Electric field forming means (electric power supply device) 11 …… Electric field control means (voltage control device) 12 …… Vibration detection means (vibration sensor)

Claims (1)

[Claims] 1. A seismic isolation device, which is provided between a foundation and a structure supported by the foundation and can absorb the vibration energy of ground vibration such as an earthquake, the base connection member being connectable to the foundation. Having a structure connecting member that can be connected to the structure at a position facing the basic connecting member, between the basic connecting member and the structural connecting member, depending on the strength of the applied electric field. A body filled with an electrorheological fluid whose viscosity changes, so that the basic connection member and the structure connection member can be relatively displaced in the horizontal direction,
And at that time, the body is provided so that the electrorheological fluid filled inside the body may be deformed, and the electrorheological fluid is provided with an electric field forming means capable of forming an electric field in the electrorheological fluid, A seismic isolation device configured by connecting an electric field control unit capable of controlling the strength of the electric field to the electric field forming unit, and connecting a vibration detection unit capable of detecting the vibration to the electric field control unit.