JP2934198B2 - Air spring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air spring device for absorbing a vertical vibration of a three-dimensional seismic isolation device and an air spring device for realizing a jack having a large stroke and a high load.

[0002]

2. Description of the Related Art As a seismic isolation device which reduces vibration applied to a structure such as a building due to crustal deformation such as an earthquake and protects the structure from vibration, and in particular, a three-dimensional seismic isolation system,
A seismic isolation device described in 173954 has been proposed. FIG. 5 shows the seismic isolation device. The seismic isolation device 1 disposed between the structure foundation 2 and the structure 3 includes a laminated rubber body 4 and an air spring device 5, and the air spring device 5 has a flat flexible shape in which high-pressure air is sealed. A plurality of metal tubes 6 are juxtaposed in the horizontal direction and stacked in the vertical direction.

In the seismic isolation device 1 described above, the horizontal vibration component of the structural foundation 2 based on the crustal deformation such as an earthquake is less likely to be transmitted to the structural body 3 due to the shear deformation of the laminated rubber body 4 having a restoring force. However, even if it is transmitted to the structure 3, it is reduced by the shear deformation of the laminated rubber body 4, while the vertical vibration component of the structure foundation 2 based on the crustal deformation such as an earthquake is
It is said that the air spring device 5 including the laminated flexible metal tubes 6 is hardly transmitted to the structure 3.

However, since the air spring device 5 of the seismic isolation device 1 is composed of the laminated flat flexible metal tubes 6, the vertical deformation when absorbing the vertical vibration component of the structural foundation 2 is performed. When the stroke is small and an excessive load is applied, there is a possibility that the crushing occurs beyond the deformation limit.
In addition, since air must be supplied / discharged to / from a large number of laminated flexible metal tubes 6, the supply / discharge structure and the supply / discharge equipment are complicated, and a large space is required for installation. Assembly work is also cumbersome.

On the other hand, a hydraulic jack has conventionally been used as a high-load jack having a large stroke.
Since the hydraulic jack uses oil, a large oil pressure source is required, and a large space is required for use. Also, it cannot be used in places where cleanliness is required.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a seismic isolation device which sufficiently absorbs the vertical vibration component of a structural foundation to make it difficult to transmit the vertical vibration component to the structure. The air spring device that can regulate the amount, the air supply / discharge structure and the supply / discharge equipment are simple, do not require a large space for installation, and are easy to assemble. Small, small, large capacity, easy to handle, and also works with compressed gas cylinders, etc.
It is an object of the present invention to provide an air spring device which can be used in a small space when used and can be used in a place where cleanliness is required.

[0007]

An air spring device according to the present invention for solving the above-mentioned problems is characterized in that a thin superplastic material is formed into a bellows type in which peaks and valleys having a U-shaped cross section are alternately continuous, and are formed vertically. A metal balloon in which a cylinder is continuously formed concentrically at the center of both end faces, a reinforcing ring mounted on an outer peripheral side of a bellows portion of the metal balloon, and an upper seat and a lower part mounted in contact with upper and lower end faces of the metal balloon. And a seat. In this air spring device, when the bellows of the metal balloon is long, a cover that covers the reinforcing ring and the lower seat from the upper seat to prevent buckling (Euler-type buckling) of the bellows protruding laterally is prevented. Is erected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the air spring device of the present invention will be described with reference to FIG. 1. Reference numeral 10 denotes a metal balloon, the metal balloon 10 is a thin superplastic material, and a peak 11 and a valley 12 having a U-shaped cross section. Are formed in a bellows type which is alternately continuous, and cylinders 13 and 13 'are continuously formed concentrically at the center of both upper and lower end surfaces. A reinforcing ring 14 is mounted on the outer side of the bellows portion of the metal balloon 10, that is, in each valley 12, on the inner side along the shape of the valley 12 and on the upper and lower outer sides along the shape of the peak 11. An air spring device 16 is formed by mounting an upper seat 15 in contact with an upper end surface of the metal balloon 10 and mounting a lower seat 15 'in contact with a lower end surface . Since the air spring device 16 has a long bellows, a cover 17 covering the reinforcing ring 14 and the lower seat 15 ′ is provided vertically from the upper seat 15.

FIG. 2 shows a case where the air spring device 16 configured as described above is applied to a three-dimensional seismic isolation device. In FIG. 2, the seismic isolation device 20 disposed between the structure foundation 18 and the structure 19 includes the laminated rubber body 4 and the air spring device 16. The laminated rubber body 4 is formed by alternately laminating rubber annular plates 23 and metal annular plates 24 between a lower disk 21 and an upper disk 22, and the lower disk 21 is attached to a circular platen 25. The circular platen 25 is fixed to the structure foundation 18 by anchor bolts (not shown). In the center of the laminated rubber body 4, a columnar lead 26 surrounded by a laminated rubber annular plate 23 and a metal annular plate 24 is provided. The upper disk 22 is bolted to an intervening member 27 disposed between the air spring device 16 and the laminated rubber body 4. The air spring device 16 has a lower seat 15 'bolted to the intervening member 27 and an upper seat 15 mounted on the lower surface of the structure 19 via a circular platen 25'. And metal balloon 1
A blind cap 40 is butt-welded to the lower cylinder 13 'to seal it. A high-pressure air supply pipe 28 is connected to the cylinder 13 on the upper side of the metal balloon 10, and a stop valve 29 and a pressure adjustment supply valve 30 are provided in the middle thereof as shown in FIG. A compressor 32 is connected to 31. Further, as shown in FIG. 2, near the connection end of the high-pressure air supply pipe 28 connected to the cylinder 13 on the upper side of the metal balloon 10, a pressure release pipe 33 for atmospheric release is branched and connected as shown in FIG. Stop valve 3
4. A pressure adjusting release valve 35 is provided.

In the above seismic isolation device 20, one of an acceleration detector, a speed detector and a vibration detector is shown in FIG. 2 as a vibration detecting means 36 for detecting vibration applied to the structure 19 as shown in FIG. As shown, an arithmetic unit 37 is provided on the structure 19 as means for controlling the degree of opening of each of the valves 29, 30, 34, and 35 in accordance with the vibration detection signal from the vibration detection means. The pressure in the metal balloon 10 is detected by a pressure detector 38, and the pressure detection signal
7 and is calculated together with the vibration detection signal.

In the seismic isolation device 20 configured as described above,
The horizontal vibration component of the structural foundation 18 based on the crustal deformation such as an earthquake includes the laminated rubber body 4 having the restoring force and the columnar lead 26.
Is less likely to be transmitted to the structure 19 due to the shear deformation of
Even if it is transmitted, it is rapidly attenuated by the shear deformation of the laminated rubber body 4 and the columnar lead 26. On the other hand, the vertical vibration component of the structural foundation 18 based on the crustal deformation such as an earthquake is generated between the upper seat 15 and the upper seat 15 ′ of the air spring device 16 .
Absorbed by the expansion and contraction of the metal balloon 10 between the structures 1
9, and is greatly attenuated even if transmitted.

In the absorption of the vertical vibration component, the vibration applied to the structure 19 is detected by the vibration detecting means 36, and the vibration detection signal is sent to the calculator 37, and the metal input to the calculator 37 in advance. The operation is performed together with the pressure detection signal in the balloon 18 to control the degree of opening of each of the valves 29, 30, 34, and 35, and the internal pressure of the metal balloon 10 is adjusted to an appropriate value. It is reduced promptly, and the amount of expansion and contraction of the metal balloon 10 is kept substantially constant.

Further, since the reinforcing ring 14 is attached to the outside of the metal balloon 10, swelling of the metal balloon 10 itself can be reliably reduced. Further, even if an excessive load is applied to the metal balloon 10, the amount of compression is regulated by the reinforcing ring 14.

Therefore, the fatigue caused by the expansion and contraction bending stress generated in the metal balloon 10 is small, and the peaks 11 and the valleys 1 of the bellows are reduced.
No crack is formed in the circumferential direction of No. 2 and there is no air leakage, the seismic isolation function can be maintained, and an extremely fail-safe seismic isolation device can be realized.

Next, FIG. 4 shows a case where the air spring device 16 of FIG. 1 is applied to a jack. In FIG. 4, the blind cap 4 is attached to the cylinder 13 on the upper side of the metal balloon 10 of the air spring device 16.
0 is butt-welded and sealed, and the lower cylinder 13 '
A high-pressure gas supply pipe 41 is butt-welded through the cover 17 and connected thereto. The upper end surface of the metal balloon 10
The upper seat 15 which is attached in contact with the blind cap 4
0, a cover 17 suspended from the outer peripheral surface of the upper seat 15 is slidably divided into two layers on the inner and outer layers, and the outer layer cover 17a is a stepped portion 4 on the outer peripheral surface of the upper seat 15.
2, the inner cover 17b is engaged with a step 45 on the outer peripheral surface of the lower seat 15 'which is mounted in contact with the lower end surface of the metal balloon 10. It is stopped and tightened and fixed by a tightening screw 46. A protrusion 47 is formed on the inner side of the lower end of the outer layer cover 17a.
An excessive deformation preventing mechanism 49 of the metal balloon 10 is formed by engaging with an upper end of the metal balloon 8. The high-pressure gas supply pipe 41 branches and connects a high-pressure gas discharge pipe 51 provided with a stop valve 50 in the middle, and the high-pressure gas supply pipe 4 upstream of the branch portion.
1 is provided with a stop valve 52 and a pressure adjusting valve 53, and a nitrogen gas cylinder 54 is connected thereto.

The jack constructed as described above is set between the surface plate and the structure so as to lift the structure (or workpiece), the stop valve 52 of the high-pressure gas discharge pipe 51 is closed, and the high-pressure gas supply pipe is set. When the stop valve 52 and the pressure adjusting valve 53 of 41 are opened and high-pressure nitrogen gas is supplied from the cylinder 54 into the metal balloon 10 and the bellows portion is extended,
The structure is pushed up via the upper seat 15. On this occasion,
Since the metal balloon 10 has the reinforcing ring 14 attached to each of the valleys 3 on the outer peripheral side of the bellows portion, each peak 1 of the bellows portion is provided.
The displacement amount of the valleys 12 becomes uniform, and the bellows portion extends without expanding in the outer peripheral direction, so that a large stroke can be obtained. Further, even if a high pressure is applied to the metal balloon 10, the bellows portion is seamless, so that no crack is caused and damage can be prevented, so that a high load can be endured. A predetermined high pressure acts on the metal balloon 10 by the pressure adjusting valve 53 to lift the structure. However, if the metal balloon 10 is extended and deformed more than necessary by an excessively high pressure, the excessive deformation is prevented. The mechanism 49 works, that is, the outer layer cover 1
The protrusion 47 of 7a engages with the upper end of the slide groove 48 of the inner layer cover 17b, and the bellows portion does not extend any more, thereby preventing deformation. When the jack has been used, the stop valve 52 and the pressure adjusting valve 53 of the high-pressure gas supply pipe 41 are closed, and the stop valve 50 of the high-pressure gas discharge pipe 51 is opened to release nitrogen gas into the atmosphere. 10 is reduced to its original state.

[0017]

As can be understood from the above description, the air spring device of the present invention is formed of a thin superplastic material into a bellows shape in which peaks and valleys having a U-shaped cross section are alternately continuous, and is formed at the center of both upper and lower end faces. It comprises a metal balloon in which a cylinder is continuously formed concentrically, a reinforcing ring mounted on the outer peripheral side of a bellows portion of the metal balloon, and an upper seat and a lower seat mounted in contact with upper and lower end surfaces of the metal balloon. Therefore, when applied to a three-dimensional seismic isolation device, the vertical vibration component of the structure foundation is absorbed by the expansion and contraction of the metal balloon between the upper and lower seats, making it difficult to be transmitted to the structure. Is also greatly attenuated. In particular, since the internal pressure of the metal balloon is adjusted to an appropriate value by the calculator in accordance with the vibration detection signal of the vibration detection means and the pressure detection signal within the metal balloon, the vibration generated in the structure is rapidly reduced, and The amount of expansion and contraction of the metal balloon is kept substantially constant.
Moreover, the swelling of the metal balloon itself can be reliably reduced by the reinforcing ring, and the amount of compression is regulated by the reinforcing ring even when an excessive load is applied. Therefore, there is little fatigue due to expansion and contraction bending stress generated in the metal balloon, there is no crack in the circumferential direction of the peaks and valleys of the bellows part, there is no air leakage,
The seismic isolation function can be maintained, and an extremely fail-safe seismic isolation device can be realized. In addition, the air supply / discharge structure and the supply / discharge equipment of the metal balloon are simplified, so that a large space is not required for installation and the assembling work is also facilitated.

Further, when the air spring device of the present invention is applied to a jack, when the structure is pushed up, the reinforcing ring is mounted on the outer peripheral side of the bellows portion of the metal balloon, so that each peak and valley of the bellows portion is formed. The amount of displacement becomes uniform, and the bellows portion extends without expanding in the outer peripheral direction, so that a large stroke is obtained. Further, even if a high pressure is applied to the metal balloon, the bellows portion is seamless, so that the bellows portion can be prevented from being damaged without cracking, so that it can withstand a high load.
Therefore, a high-load jack having a large stroke can be realized. In addition, it has a small inner diameter, is small, has a large capacity, and is easy to handle. In addition, it can be operated with a compressed gas cylinder or the like.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an air spring device of the present invention.

FIG. 2 is a longitudinal sectional view showing a seismic isolation device to which the air spring device of FIG. 1 is applied.

3 is a diagram showing an air pressure control system for a metal balloon of an air spring device in the seismic isolation device of FIG.

FIG. 4 is a longitudinal sectional view showing a jack to which the air spring device of FIG. 1 is applied.

FIG. 5 is a longitudinal sectional view showing a conventional seismic isolation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Metal balloon 11 Mountain 12 Valley 13, 13 'Cylinder 14 Reinforcement ring 15 Upper seat 15' Lower seat 16 Air spring device 17 Cover

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16F 9/04 E04B 1/36 E04H 9/02 331 F16F 15/04 F16J 3/04

Claims (2)

(57) [Claims] 1. A metal balloon formed of a thin superplastic material into a bellows shape in which peaks and valleys having a U-shaped cross section are alternately continuous, and a cylinder is continuously formed concentrically at the center of both upper and lower end surfaces, and the metal balloon. A reinforcing ring attached to the outer peripheral side of the bellows part,
An air spring device comprising an upper seat and a lower seat mounted on upper and lower end surfaces of the metal balloon. 2. The air spring device according to claim 1, wherein
An air spring device, wherein a cover for covering a reinforcing ring and a lower seat is vertically provided from an upper seat.