JP2807666B2 - Seismic isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation system that reduces vibrations generated in structures such as buildings due to crustal deformation such as earthquakes, protects the structures from vibrations, and in particular, enables three-dimensional seismic isolation. It relates to improvement of the device.

[0002]

2. Description of the Related Art An example of a seismic isolation device that enables three-dimensional seismic isolation is disclosed in Japanese Patent Application Laid-Open No. 7-173955. As shown in FIG. 4, the seismic isolation device 50 includes a structure foundation 51.
And a structure 52, and a laminated rubber body 53
And an air spring device 54. One end of the air spring device 54 has a laminated rubber member to form high-pressure air storage chambers 55 and 56 between the laminated rubber body 53 and the structure 52 as shown in FIG. 5. A metal inner flexible bellows 59 connected to an intermediate seat 57 attached to the body 53 and the other end connected to an upper seat 58 attached to the structure 52, and concentric with the inner flexible bellows 59; It comprises an outer flexible bellows 60 made of metal.

The seismic isolation device 50 has a double-layer structure of a metal inner flexible bellows 59 and a metal outer flexible bellows 60 in order to form the high-pressure air storage chambers 55 and 56 in the air spring device 54. Bellows are required and the outer diameter of the seismic isolation device increases. In addition, the inner and outer flexible bellows 5
The 9,60 individual strengths must be maintained independently of each other. Furthermore, when the flexible bellows 59 and 60 repeatedly generate expansion and contraction stress due to the vibration generated in the structure 52, a thin crack may be formed in the circumferential direction of the peak or valley of the bellows due to metal fatigue. If a crack occurs in the inner or outer bellows, the pressure in the high-pressure air storage chamber 55 or 56 decreases, but the pressure in the other bellows is adjusted to obtain the same supporting load as before the damage of one bellows. It is designed to be.

[0004] Although the high-pressure air storage chambers 55 and 56 are doubled, the probability of simultaneous damage is extremely small.
A seismic isolation device in which a thick laminated rubber body 62 is provided on the inner peripheral side of a cylindrical body 61 surrounding flexible bellows 59 and 60 as shown in FIG. 50 'has been proposed. However, the outer diameter is further increased, and a large space is required for installing the seismic isolation device 50 '.

[0005]

Accordingly, the present invention does not use a double bellows, reduces the outer diameter of the seismic isolation device, improves the strength of the device, makes it harder to damage, and provides high-pressure air even if damage occurs. An object of the present invention is to provide a seismic isolation device in which the pressure in the accommodation chamber does not decrease and the function of the air spring device does not decrease.

[0006]

A seismic isolation device according to the present invention for solving the above-mentioned problems is provided between a structural foundation and a structure, and comprises a laminated rubber body and an air spring device. In the air spring device, the air spring device is provided between the laminated rubber body and the structure, one end is connected to an intermediate seat attached to the laminated rubber body, and the other end is connected to an upper seat attached to the structure. A metal flexible bellows having a high-pressure air accommodating chamber formed therein is provided. The metal flexible bellows includes an inner bellows having a U-shaped cross section with alternating peaks and valleys, and an outer peripheral surface of the inner bellows. A gap holding material extending along the outer circumference of the gap holding material and a bellows having a U-shaped cross section alternately continuous along the outer peripheral surface of the gap holding material are laminated and integrally formed.

In the above-described seismic isolation device, it is preferable that the gap between the inner bellows and the outer bellows of the metal flexible bellows is filled with gas so that the pressure is set to an intermediate pressure between the pressure inside and outside the bellows.

[0008] In each of the above seismic isolation devices, the gap holding material of the metal flexible bellows is preferably a wire mesh or a spiral material or a band material arranged along the pipe axis at equal angular intervals in the circumferential direction. .

In each of the above seismic isolation devices, a reinforcing ring is preferably provided outside the metal flexible bellows.

In each of the above seismic isolation devices, the metal flexible bellows and the intermediate seat are covered by a cylindrical body vertically suspended from the upper seat, and the metal flexible bellows is compressed by a predetermined amount on the inner peripheral side of the cylindrical body. It is preferable that an annular thick laminated rubber body to be pressed against the intermediate seat when provided is provided.

In the above-described seismic isolation device, the gap between the high-pressure air storage chamber and the inner and outer bellows of the metal flexible bellows is interposed between the inside of the high-pressure tank to which the compressor is connected, the stop valve, and the pressure adjusting injection valve. It is preferable that they are connected to each other and that they are opened to the atmosphere via a stop valve and a pressure control release valve.

In this seismic isolation device, a vibration detecting means for detecting vibration applied to the structure, a pressure detector for detecting the pressure in the high-pressure air storage chamber and the gap, a vibration detection signal and a pressure from the vibration detecting means It is preferable to include a control unit that controls the degree of opening of each valve according to a pressure detection signal from the detector to adjust the pressure in the high-pressure air storage chamber and the gap.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a seismic isolation device of the present invention will be described with reference to the drawings. In FIG. 1, a seismic isolation device 1
Is disposed between the structure foundation 2 and the structure 3 and includes a laminated rubber body 4 and an air spring device 5. The air spring device 5 includes a metal flexible bellows 6 between the laminated rubber body 4 and the structure 3, and the metal flexible bellows 6 has a circular shape having one end (lower end) attached to the laminated rubber body 4. And the other end (upper end) is connected to a circular upper seat 8 attached to the structure 3 to form a high-pressure air storage chamber 9 inside. As shown in FIG. 2, the metal flexible bellows 6 is made of an inner bellows 10 made of SUS 316 having a U-shaped cross section in which peaks and valleys are alternately continuous, and a wire mesh of SUS 316 along the outer peripheral surface of the inner bellows 10. And a cross section U along the outer circumferential surface of the gap holding material 11.
The outer bellows 12 made of SUS316, in which the peaks and valleys of the shape are alternately continuous, is formed by integrally laminating.

As shown in FIG. 1, the laminated rubber body 4 is formed by alternately laminating a rubber annular plate 15 and a metal annular plate 16 between a lower disk 13 and an upper disk 14. The disk 13 is attached to a circular lower seat 17, and the lower seat 17 is fixed to the structural foundation 2 by anchor bolts (not shown). The upper disk 14 is fixed to the intermediate seat 7 by bolts (not shown). At the center of the laminated rubber body 4, a columnar lead 18 surrounded by a laminated rubber annular plate 15 and a metal annular plate 16 is arranged.

One end (lower end) of the metal flexible bellows 6 is hermetically fixed by welding or the like to the inner peripheral surface of an annular projection 19 provided integrally with the intermediate seat 7, and the other end (upper end) is an upper seat. The inside of the metal flexible bellows 6 is made into the high-pressure air accommodating chamber 9 by being hermetically fixed by welding or the like to an inner peripheral surface of an annular projection 20 provided integrally with the annular projection 8. A reinforcing ring 21 is provided outside the metal flexible bellows 6 as shown in FIG. The metal flexible bellows 6 provided with the reinforcing ring 21 on the outside is covered with a cylindrical body 22 suspended from the upper seat 8 together with the intermediate seat 7, and on the inner peripheral side of the cylindrical body 22,
When the metal flexible bellows 6 is compressed to the maximum extent, the intermediate seat 7
The annular thick laminated rubber body 23 pressed against the upper seat 8
It is hanging from.

A high-pressure air accommodating chamber 9 in the metal flexible bellows 6 is provided with a pressure supply pipe welded through an annular projection 20 provided integrally with the upper seat 8 as shown in FIG. As shown in FIG. 3, the pressure supply pipe 24 is provided with a stop valve 25 and a pressure adjusting injection valve 26 on the way, and is connected to a header 27. The high pressure tank 29 is connected to a compressor 30. Further, a pressure release pipe 31 for releasing air to the atmosphere is attached to the high-pressure air storage chamber 9, and a stop valve 32,
A pressure regulating discharge valve 33 is provided.

However, the gap 34 formed by the gap holding material 11 made of a wire mesh sandwiched between the inner bellows 10 and the outer bellows 12 of the metal flexible bellows 6 has:
As shown in FIG. 2, a pressure supply pipe 35 is fixedly connected to the outer bellows 12 and communicates therewith. The pressure supply pipe 35 is provided with a stop valve 36 and a pressure adjusting injection valve 37 in the middle as shown in FIG. It communicates with the header 27.
A pressure release pipe 38 for atmospheric release is attached to the space 34, and the pressure release pipe 38 is provided with a stop valve 39 and a pressure adjustment release valve 40.

In the seismic isolation device 1 of the present invention, any one of an acceleration detector, a speed detector and an amplitude detector is employed as the vibration detecting means 41 for detecting the vibration applied to the structure 3 in FIG. According to the vibration detection signal from the vibration detection means 41, each of the valves 25, 26, 32, 33,
An arithmetic unit 42 is provided as control means for controlling the opening degrees of 36, 37, 39, and 40. The pressure in the high-pressure air storage chamber 9 is
The pressure in the gap 34 is detected by the pressure detector 43, and the pressure in the gap 34 is detected by the pressure detector 44. Each pressure detection signal is input to the calculator 42, and is calculated together with the vibration detection signal.

In the seismic isolation device 1 shown in FIG. 1 of the embodiment configured as described above, the horizontal vibration component of the structural foundation 2 based on the crustal deformation such as an earthquake is converted into a laminated rubber body 4 having a restoring force.
And, it is not transmitted to the structure 3 due to the shear deformation of the columnar lead 18, and even if it is transmitted, it is rapidly attenuated by the shear deformation of the laminated rubber body 4 and the columnar lead 18. On the other hand, a vertical vibration component of the structure foundation 2 based on crustal deformation such as an earthquake is absorbed by the air spring device 5 including the high-pressure air storage chamber 9 formed in the metal flexible bellows 6 and transmitted to the structure 3. And is greatly attenuated even if transmitted. In the absorption of the vertical vibration component, a bending stress of expansion and contraction is repeatedly generated in the metal flexible bellows 6. The metal flexible bellows 6 includes an inner bellows 10, a gap holding material 11, and an outer bellows as shown in FIG. 12 are laminated and integrally molded, so that they can reinforce each other and have high mechanical strength, and a bellows that can withstand the same pressure can be made with a thinner plate than before, so that stress due to deformation can be reduced. In addition, thin cracks are less likely to occur in the circumferential direction of the peaks or valleys of the bellows, and damage is suppressed. Moreover, even if a large load is applied, the metal bellows 6 can be sufficiently supported and the metal flexible bellows 6 itself does not expand, so that the seismic isolation function can be maintained.

The gap 34 formed by the gap holding member 11 made of a wire mesh sandwiched between the inner bellows 10 and the outer bellows 12 of the metal flexible bellows 6 due to air leakage or the like, and the inner pressure of the high-pressure air storage chamber 9. When the internal pressure decreases below a predetermined value, the pressure detector 43 shown in FIG.
The pressure is detected by 44, and the pressure detection signal is sent to the calculator 42, where the pressure adjusting injection valve 26,
37 is controlled, and the high-pressure air accommodating chamber 9 and the gap 3 are controlled.
4 is maintained at a predetermined value.

The vibration applied to the structure 3 is detected by the vibration detecting means 41, and a vibration detection signal is sent to the calculator 42, and the vibration in the high-pressure air storage chamber 20 input in advance by the calculator 42. It is calculated together with the pressure detection signal and the pressure detection signal in the gap 34, and each valve 25, 26, 32, 3
As a result of controlling the opening degrees of 3, 36, 37, 39, and 40, and adjusting the internal pressure of the high-pressure air storage chamber 20 and the internal pressure of the gap 34 to appropriate values, the vibration generated in the structure 3 is promptly reduced. .

Further, outside the metal flexible bellows 6,
Since the reinforcing ring 21 is provided as shown in FIG. 2, the swelling of the metal flexible bellows 6 itself can be reliably reduced even under a large pressure. Further, when an excessive load is applied to the metal flexible bellows 6 to compress it by a maximum amount, the annular thick laminated rubber body 23 shown in FIG. 1 is pressed against the intermediate seat 7, so that the height position of the structure 3 is increased. Does not fall any further, and the structure 3 is protected from collapse. In addition, when the inner bellows 10 is damaged and the air in the high-pressure air storage chamber 9 leaks, the outer bellows retains the air.
Withstand air pressure. If the outer bellows 12 is damaged and the air in the gap 34 leaks out, the inner bellows 1
Numeral 0 holds the air in the high-pressure air storage chamber 9, and the pressure in the high-pressure air storage chamber 9 is transmitted to and held by the outer bellows 12 by the wire mesh which is the gap holding material 11. As described above, even if air leakage occurs in the outer bellows 12, the leakage is caused by cracks generated in the circumferential direction of the peaks or valleys of the bellows. Leakage of the air in the high-pressure air storage chamber 9 is suppressed, the structure 3 can be supported, and the seismic isolation function is hardly reduced.

Incidentally, the metal flexible bellows 6 of the above embodiment is used.
Is made of a wire mesh,
The band material may be spirally wound, or may be a band material arranged at equal angular intervals in the circumferential direction along the tube axis direction. Further, the inner bellows 10 and the outer bellows 12 in the metal flexible bellows 6 are made of a thick single-layer plate material SUS316.
However, a thin multi-layered plate made of SUS316 may be used.

[0024]

As can be seen from the above description, the seismic isolation device of the present invention does not use a double bellows as in the prior art, but has a metal flexible body in which an inner bellows, a gap holding material, and an outer bellows are integrally formed. Since bellows are used, the outer diameter of the whole seismic isolation device can be reduced, and a large space is not required for installing the seismic isolation device. Further, the metal flexible bellows having the above structure has a high mechanical strength, and is hardly damaged even if bending bending stress of expansion and contraction is repeatedly generated in absorption of a vertical vibration component generated by crustal deformation such as an earthquake. Also, the function of the air spring device can be maintained without lowering the pressure of the high-pressure air storage chamber of the metal flexible bellows, and an extremely fail-safe seismic isolation device can be realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a seismic isolation device of the present invention.

FIG. 2 is an enlarged vertical sectional view of a metal flexible bellows provided in an air spring device in the seismic isolation device of the present invention.

FIG. 3 is a diagram showing an air supply / discharge control system of an air spring device in the seismic isolation device of the present invention.

FIG. 4 is a schematic view showing a use state of a conventional seismic isolation device.

FIG. 5 is a partially sectional perspective view of the seismic isolation device of FIG. 4;

FIG. 6 is a longitudinal sectional view showing another example of the conventional seismic isolation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Structural foundation 3 Structure 4 Laminated rubber body 5 Air spring device 6 Metal flexible bellows 7 Intermediate seat 8 Upper seat 9 High-pressure air storage room 10 Inner bellows 11 Void holding material 12 Outer bellows 21 Reinforcing ring 22 Cylindrical body 23 Annular thick laminated rubber body 24, 35 Pressure supply pipe 25, 36 Stop valve 26, 37 Pressure adjustment injection valve 27 Header 28 Pressure supply main pipe 29 High pressure tank 30 Compressor 31, 38 Pressure release pipe 32, 39 Stop Valves 33, 40 Release valve for pressure adjustment 34 Air gap 41 Vibration detection means 42 Computing unit (control means) 43, 44 Pressure detector

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-7-173955 (JP, A) JP-A-5-261153 (JP, A) JP-A-59-220221 (JP, A) JP-A-7-173 173954 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E04H 9/02 F16F 9/04 F16F 15/04

Claims (7)

(57) [Claims] 1. A seismic isolation device which is disposed between a structure foundation and a structure and comprises a laminated rubber body and an air spring device, wherein the air spring device is provided between the laminated rubber body and the structure.
One end is connected to the intermediate seat attached to the laminated rubber body,
A metal flexible bellows having the other end connected to an upper seat attached to the structure and having a high-pressure air storage chamber formed therein, the metal flexible bellows having a peak and a valley having a U-shaped cross section. An inner bellows alternately continuous, a gap holding material along the outer peripheral surface of the inner bellows, and an outer bellows having alternating U-shaped peaks and valleys along the outer peripheral surface of the gap holding material are integrally laminated. A seismic isolation device characterized by being molded. 2. The seismic isolation device according to claim 1, wherein a gas is filled in a gap between the inner bellows and the outer bellows of the metal flexible bellows, and the pressure is set to an intermediate pressure between the pressure inside and outside the bellows. Characteristic seismic isolation device. 3. The seismic isolation device according to claim 1, wherein the gap holding material of the metal flexible bellows is a wire mesh or a spiral material or a band arranged along the pipe axis direction at equal angular intervals in the circumferential direction. A seismic isolation device characterized by being a material. 4. The seismic isolation device according to claim 1, wherein the metal flexible bellows is provided with a reinforcing ring on the outside. 5. The seismic isolation device according to claim 1, wherein the metal flexible bellows is covered together with the intermediate seat by a cylindrical body suspended from an upper seat, and an inner peripheral side of the cylindrical body. To
A seismic isolation device comprising: an annular thick laminated rubber body that is pressed against an intermediate seat when a predetermined amount of a metal flexible bellows is compressed. 6. The seismic isolation device according to claim 2, wherein the high-pressure air storage chamber and the gap between the inner bellows and the outer bellows of the metal flexible bellows are provided with a high-pressure space to which a compressor is connected. A seismic isolation device which is communicated with the inside of the tank via a stop valve and a pressure adjusting injection valve, and is opened to the atmosphere via a stop valve and a pressure adjusting discharge valve. 7. The seismic isolation device according to claim 6, wherein the vibration detecting means detects vibration applied to the structure, a pressure detector detects pressure in a high-pressure air storage chamber and a gap, and the vibration detecting means comprises: Control means for controlling the opening degree of each valve in accordance with the vibration detection signal from the pressure detector and the pressure detection signal from the pressure detector to adjust the pressure in the high-pressure air storage chamber and the gap. apparatus.