JPH08218682A - Base isolation damper - Google Patents

Abstract

PURPOSE: To sufficiently damp the vibration of a structure by mutually connecting two sheets of plates and another plate which is sandwichedly pressed between the above two plates into contact and relatively rotates to the above two pates at each of their basic ends, and connecting the end of one plate to a foundation and the end of the other plate to the structure, and providing a hydraulic cylinder in a basic end part. CONSTITUTION: When earthquake force acts on a structure 20, a laminated rubber 23 deforms in a shearing direction and functions for reducing the earthquake force. Sensors 21 in both directions then detect deformation data. A computer 22 computes an optimum hydraulic pressure-feed pattern to feed a control signal to a hydraulic supply device 25. Next oil is pressure-fed to the hydraulic cylinder of a base isolation damper 1. Compressive face pressure acts on the upside of the first and the second disc of a base isolation damper 1 to make frictional force between discs stronger. Thus if the compressive face force acts so as to rotate the disc in a relative rotating direction, rotating energy is absorbed to exercise resisting force. The vibration of the structure can thereby be damped.

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 more particularly, to a seismic isolation damper which is attached to the base of a structure to improve the seismic isolation effect.

[0002]

2. Description of the Related Art As a conventional seismic isolation damper, as shown in FIGS. 6 and 7, two upper and lower steel plates 41 are pressed against each other via friction members 43, and The two steel plates 41 are connected to one steel plate 42 capable of rotating relative to each other by a shaft 49 at their respective base end portions, and the other end portions 41a of the two steel plates 41 are fixed to each other with a fixing fitting. The other end 4 of the other steel plate 42 is connected to the foundation 47 by 48 or the like.
2a is connected under the beam (not shown) of the structure, and in order to press the steel plates 41 and 42 into pressure contact with each other, via the disc spring 45, the pressing plate 50 and the load cell 46 from above these steel plates,
The nut 44 is tightened with high tension.

Such a seismic isolation damper 40 causes a relative horizontal displacement between an upper structure and a lower foundation.
The steel plates 41 and 42 rotate about the shaft 49 and slide while receiving a frictional force between the steel plates 41 and 42. This frictional force absorbs the resistance energy, and the vibration of the structure is damped.

[0004]

However, in the conventional seismic isolation damper described above, a constant surface pressure preset during construction is maintained regardless of the presence or absence of external force or the magnitude of external force. An external force such as an earthquake whose input direction is uncertain may not be sufficiently damped by the set surface pressure.

Further, when the plane or cross section of the structure is not symmetrical in the vertical and horizontal directions, the weight of the structure is likely to be biased, and torsional vibration may occur depending on how the external force acts. With the seismic isolation damper set to the surface pressure of, the torsional vibration of the structure may not be attenuated.

The present invention has been made to solve the problems of the conventional seismic isolation dampers, and its purpose is to:
To provide a seismic isolation damper that can sufficiently dampen the vibration of a structure even when the strength or input direction of an external force such as an earthquake acting on the structure is uncertain or the structure causes torsional vibration. It is in.

[0007]

The present invention has been made in view of the above-mentioned object, and its gist is to be sandwiched between two first plate bodies and the two first plate bodies. And a second plate body that is pressed against the first plate body and is rotatable relative to the first plate body at each base end portion, and one of the first and second plate bodies is connected. Based on the other end of the plate body, in the seismic isolation damper that connects the other end of the other plate body to the structure,
The seismic isolation damper comprises a hydraulic cylinder that adjustably applies a compression surface pressure to the base ends of the first and second plates.

[0008]

In the seismic isolation system in which a plurality of seismic isolation dampers of the present invention are connected to the foundation and the structure, when a force such as an earthquake is applied to the building, the laminated rubber is deformed in the shearing direction due to the shaking of the structure. And work to reduce seismic force. This causes a relative displacement between the structure and the foundation. Seismic force acts on the structure due to this sliding motion. This seismic force is detected by a bidirectional displacement sensor (a sensor capable of detecting acceleration, velocity and length), the detected data is calculated by a computer, and a control signal is sent to the hydraulic pressure supply device. In response to this control signal, the hydraulic pressure supply device appropriately pressure-feeds oil to the hydraulic cylinder of a predetermined seismic isolation damper. In the seismic isolation damper thus pumped with oil, the hydraulic cylinder applies a compressive surface pressure to the base end portions of the first and second plate bodies, so that the frictional force between these plate bodies is strengthened. Therefore, even if the first and second plate bodies try to rotate relative to each other due to the sway transmitted to the seismic isolation damper through the structure and the foundation, the enhanced frictional force causes
This rotational energy is fully absorbed, thereby damping the sway of structures due to earthquakes.

[0009]

Embodiments of the seismic isolation damper of the present invention will be described in detail with reference to the accompanying drawings. 1 is a plan view of the seismic isolation damper of the present invention, FIG. 2 is a sectional view taken along the alternate long and short dash line II-II of FIG. 1, FIG. 3 is a schematic sectional view of a structure in which the seismic isolation damper of FIG. 1 is installed, FIG. 4 is a plan view taken along one-dot chain line IV-IV in FIG.
FIG. 5 is a plan view taken along the alternate long and short dash line VV in FIG. In this embodiment, as shown in FIGS. 3 and 5, the foundation 26
The seismic isolation damper 1 applied to the seismic isolation system in which the laminated rubber 23 is placed on the laminated rubber 23 and the structure 20 is further installed on the laminated rubber 23 is illustrated. Seismic isolation damper 1 of the present invention
As shown in FIGS. 1 and 2, the two first discs 2 and 3 each having a tip end portion formed in a pointed shape and a base end portion formed in a disk shape, and the first disk A second disc 4 having substantially the same shape as the first discs 2, 3 and rotatably coupled to the first discs 2, 3 at the proximal end, and the first discs 2, 3 and The friction members 5 and 6 interposed between the second disks 4 and a hydraulic cylinder 7 that press-contacts the disks 2, 3 and 4 by applying a compression surface pressure from above are provided as main parts.

The friction members 5 and 6 are made of a disc-shaped body made of leather, a sintered metal containing copper as a main component, or another material. As shown in FIG. The first disc 2 is fixed to the upper and lower friction members 5 from above and the second disc 3 is applied to the lower friction member 6 from below.

Then, the first and second disks 2, 3,
A through hole is formed substantially in the center of each of the friction material 4 and the friction members 5 and 6, and the shaft 8 having the base plate 8b is inserted into the through hole. A base plate 8b of the shaft 8 is placed on a foundation 11, and a disc-shaped pressing member 9 having a hydraulic cylinder 7 is screwed onto a screw thread 8a formed at the tip of the shaft 8. As a result, the first discs 2, 3 and the second disc 4 are relatively rotatably coupled to each other, and both members are pressed against each other under the interposition of the friction members 5, 6.

An annular recess 7c is formed on the surface of the pressing member 9 facing the first disk 2, and an annular pressing pad 7d is slidably fitted in the recess 7c. Further, a nozzle 7b communicating with the inside is fixed to the upper surface of the recess 7c, and the nozzle 7b is fixed to the hydraulic pipe 7
The hydraulic cylinder 7 is formed on the pressing member 9 so as to communicate with the hydraulic pressure supply device 25 (see FIG. 3) via a. In the hydraulic cylinder 7 having such a configuration, when oil is pressure-fed and supplied from the hydraulic pressure supply device 25 to the concave portion 7c via the hydraulic pipe 7a and the nozzle 7b, the pressing pad 7
The d slides in the recess 7c to apply a compressive surface pressure to the first disk 2, whereby the first disks 2 and 3 and the second disk 4 can be relatively pressed against each other.

Further, the first fixing pin 10a is inserted through the holes 2a and 3a at the tips of the first disks 2 and 3 with the interposition of a bearing (not shown) or the like. Similarly, a second fixing pin (not shown) is attached to the tip portion 4a of the second disk 4 under the interposition of a bearing (not shown) to form a tip movable portion connecting point.

When the seismic isolation damper 1 having the above-described structure is incorporated into the seismic isolation system for the structure 20 as shown in FIG. 3, the relative rotational movement directions shown by the dotted arrows in FIG. 1 are shown in FIG. A plurality of first fixing pins 10a of the seismic isolation damper 1 are arranged by the fixing member 10 along the longitudinal direction (x direction) or the lateral direction (y direction) of the structure plane. It is connected to the foundation 11 of the object 20, and the second fixing pin is also connected to the foundation beam 12 by the fixing member 13.
Further, in addition to the seismic isolation damper 1 and the above-mentioned laminated rubber 23, the structure 20 is installed at both longitudinal ends of a predetermined floor and basement of the structure for detecting vibration such as an earthquake. From the sensors 21, 24 capable of detecting displacements such as acceleration, velocity and length in both directions intersecting with each other, a hydraulic supply device 25 for pumping oil to the hydraulic cylinder 7 of the seismic isolation damper 1, and the sensors 21, 24 And a computer 22 that controls the hydraulic pressure supply device 25 in accordance with the vibration information.

In such a seismic isolation system, when a seismic force is applied to the structure 20, the structure 20 sways in a natural period relaxed by the laminated rubber 4. Then the sensor 21,
The computer 24 detects displacement data (displacement data such as acceleration, velocity and length) in both the x and y directions of the shaking and calculates it by the computer 2
No. 2 is transmitted to the hydraulic pressure supply device 2, the optimum hydraulic pressure feeding pattern for damping this fluctuation is calculated by the computer 22, and a control signal is transmitted to the hydraulic pressure supply device 25.

For example, when the shaking direction of the structure 20 coincides with the x direction in FIG.
A control signal is transmitted to the hydraulic pressure supply device 25 so that the oil is intensively pumped to the hydraulic cylinders 7 of the four seismic isolation dampers 1x arranged on the sides in the longitudinal direction. As a result, oil is pumped to the four seismic isolation dampers 1x, and the compression surface pressure acts on the first and second discs 2, 3 and 4 of each seismic isolation damper 1x, and the space between these discs is increased. The friction force of is strengthened. Therefore, the seismic force transmitted to the seismic isolation damper 1x through the first fixing pin 10a and the second fixing pin causes the first and second discs 2, 3 and 4 to be centered on the shaft 8 as shown in FIG. Even if an attempt is made to relatively rotate in the relative rotational movement direction indicated by the dotted arrow, the frictional force between the first and second disks 2, 3, 4 and the friction materials 5, 6 is compressed. Since it is reinforced by the surface pressure, it sufficiently absorbs this rotational energy and exerts a great resistance to the rotational movement. As a result, the shaking of the structure 20 due to the earthquake is greatly dampened.

Further, similarly to the above, when it shakes in the y direction, the four seismic isolation dampers 1y are controlled so that the oil is intensively pumped to the hydraulic cylinders 7 and further combined in both the x and y directions. Even when shakes or torsional vibrations are applied, the hydraulic cylinders 7 of the seismic isolation dampers 1x and 1y are controlled so that the shakes can be minimized so that an optimized hydraulic pressure is applied.

[0018]

The seismic isolation damper of the present invention is provided with a hydraulic cylinder that can adjust the compression surface pressure to the base end portions of the first and second plates, so that the strength and the input direction are uncertain. Even if the external force is applied to the structure or torsional vibration is generated due to the deviation of the weight, a plurality of the seismic isolation dampers may be installed in two directions (for example, the longitudinal direction of the structure and the longitudinal direction of the structure). If it is arranged in the short-side direction, etc., it is possible to appropriately adjust the strength of the external force, the input direction, and the vibration characteristics.
The vibration of the structure can be damped by changing the compression surface pressure of the seismic isolation damper.

[Brief description of drawings]

FIG. 1 is a plan view of a seismic isolation damper according to the present invention.

2 is a cross-sectional view taken along the alternate long and short dash line II-II in FIG.

FIG. 3 is a schematic sectional view of a structure in which the seismic isolation damper of FIG. 1 is installed.

4 is a plan view taken along alternate long and short dash line IV-IV in FIG.

5 is a plan view taken along the alternate long and short dash line VV in FIG.

FIG. 6 is a plan view showing a conventional seismic isolation damper.

7 is a cross-sectional view taken along alternate long and short dash line VII-VII in FIG.

[Explanation of symbols]

 1 seismic isolation damper 2 first disc (first plate) 3 first disc (first plate) 4 second disc (second plate) 7 hydraulic cylinder

Claims (1)

[Claims] 1. A first plate body of two sheets, and a second plate body sandwiched between the first plate bodies of the two sheets and press-contacted with each other, and capable of rotating relative to the first plate body. Of the first and second plates, and the other end of the other plate to the structure. In the seismic isolation damper described above, a seismic isolation damper comprising a hydraulic cylinder that adjustably applies a compression surface pressure to the base end portions of the first and second plate bodies.