JP2007218391A - High pressure air spring type base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a size of an air spring without deteriorating a support function or a base isolation function, and to improve safety by detecting a malfunction of the air spring before a loss of function is reached. <P>SOLUTION: In a structure of the high pressure air spring type base isolation device, an inner cylinder member 14 and an outer cylinder member 10 are combined so as to relatively move in an axial direction, and a gap part between the inner cylinder member and the outer cylinder member is partitioned by a rolling seal mechanism 22 to define a high pressure air chamber. In a structure of the rolling seal mechanism, a plurality of diaphragms 30, 32 are lapped, and they are attached by deviating positions of fold back deformation parts of the diaphragms. Internal pressures between the diaphragms become higher stepwise. A pressure detection system detecting a gas pressure between the diaphragms is formed by providing spacers comprised of protruding patterns integrally formed on surfaces of the rubber diaphragms, and forming gas passages by the spacers. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-pressure air spring type seismic isolation device having a rolling seal mechanism, and more specifically, a rolling seal mechanism in which a plurality of diaphragms are stacked and the internal pressure between the diaphragms is increased stepwise. The present invention relates to a high-pressure air spring type seismic isolation device that can increase the supporting load by adopting it.

  The air spring functions effectively when isolating and isolating various structures or equipment in the vertical direction. Recently, a three-dimensional seismic isolation device using an air spring has been developed for seismic isolation support of a heavy load structure such as a reactor building.

  As this type of three-dimensional seismic isolation device, there is a structure in which horizontal seismic isolation means made of laminated rubber and vertical seismic isolation means made of air springs are connected in series (for example, see Patent Document 1). The upper horizontal seismic isolation means functions to alleviate horizontal shaking, and the lower vertical seismic isolation means functions to alleviate vertical shaking. Here, the air spring used for the vertical seismic isolation means is such that the inner cylinder member and the outer cylinder member are combined so as to be relatively movable in the axial direction, and the gap between the inner cylinder member and the outer cylinder member is a rolling seal. This structure is partitioned by a mechanism to define a high-pressure air chamber.

  Specifically, in a design example of a system for three-dimensional seismic isolation of a reactor building having a weight of about 270,000 tons, for example, 272 seismic isolation devices are distributed and arranged between the reactor building and the foundation (ground). Of these 272 seismic isolation devices, 112 are hydraulic rocking suppression devices and 160 are seismic isolation devices using air springs. The support load of one seismic isolation device (at the time of settling) is 1000 tons. In order to support this load, the conventional structure requires an air spring having an internal pressure of 1.6 MPa and an inner cylinder member having a diameter of approximately 3 m.

In such a conventional technique, when the supporting load is increased, the diameter of the air spring is increased and the space occupation ratio is increased. Further, as the size of the air spring is increased, there is a risk that access for maintenance may be hindered. Furthermore, since damage to the air spring directly leads to loss of the support function, there is a need to improve the fail-safe property of the air spring, but no effective countermeasure has been developed in the prior art.
JP 2004-68453 A

  The problem to be solved by the present invention is to reduce the size of the air spring without deteriorating the support function or the seismic isolation function. Another problem to be solved by the present invention is to make it possible to detect an abnormality of the air spring before the loss of function, thereby improving safety.

  In the present invention, an inner cylinder member and an outer cylinder member are combined so as to be relatively movable in the axial direction, and a gap between the inner cylinder member and the outer cylinder member is partitioned by a rolling seal mechanism to define a high-pressure air chamber. In the high-pressure air spring type seismic isolation device having the structure described above, the rolling seal mechanism has a structure in which a plurality of diaphragms are overlapped and the positions of the folded deformation portions of the diaphragms are shifted, and the internal pressure between the diaphragms is reduced. This is a high pressure air spring type seismic isolation device characterized by increasing pressure gradually. Here, a configuration in which the inner cylinder air chamber and the outer cylinder air chamber communicate with each other by an orifice is preferable. The simplest configuration is to double the diaphragm, but it is also possible to make the diaphragm into a multiple structure of three or more.

  In the present invention, a spacer is interposed between the diaphragms, whereby a gas flow path is formed, and a pressure detection system for detecting a gas pressure between the diaphragms is connected. The spacer interposed between the diaphragms is preferably a convex pattern integrally formed on the surface of the rubber diaphragm. An inert gas may be filled between the diaphragms.

  If such a high-pressure air spring type seismic isolation device is used and a horizontal seismic isolation means made of laminated rubber is installed in series thereto, a three-dimensional seismic isolation device can be constructed.

  The high-pressure air spring type seismic isolation device of the present invention has a rolling seal mechanism in which a plurality of diaphragms are stacked and attached by shifting the position of the folded deformation portion of each diaphragm, and the internal pressure between these diaphragms is increased stepwise. By being equipped, it becomes possible to set the limit of the air spring internal pressure determined by the pressure limit of the diaphragm to a high pressure that is not affected by it, and the diameter can be made smaller than that of the conventional product. Or in the case of the same diameter as a conventional product, a support load can be increased.

  Moreover, since the high pressure air spring type seismic isolation device of the present invention has a configuration in which a plurality of diaphragms are stacked, it is possible to detect leakage from the diaphragms by detecting the pressure between the diaphragms, and thereby before function loss. Repair is possible and safety is improved. Furthermore, if an inert gas is filled between the diaphragms, even if the outer diaphragm is damaged, flame retardancy can be imparted.

  An embodiment of the high-pressure air spring type seismic isolation device according to the present invention is shown in FIG. This embodiment is an example of a three-dimensional seismic isolation device in which horizontal seismic isolation means made of laminated rubber is installed in series with a high-pressure air spring type seismic isolation device. A shows the overall configuration, B is an enlarged view of the main part, and C is an enlarged cross-sectional view at the cc position.

  The outer cylinder member 10 is fixed to the base 12, the inner cylinder member 14 is loosely fitted in the outer cylinder member 10, and the inner cylinder member 14 is movable up and down with respect to the outer cylinder member 10. It has become. The inner cylinder air chamber 16 and the outer cylinder air chamber 18 are connected through an orifice 20 provided at the bottom of the inner cylinder member 14. The annular gap between the inner cylinder member 14 and the outer cylinder member 10 is partitioned by a rolling seal mechanism (folded-shaped diaphragm) 22, and high pressure air consisting of the inner cylinder air chamber 16 and the outer cylinder air chamber 18 as a whole. The chamber is defined so that airtightness is maintained even when the inner cylinder member 14 moves up and down. In this example, a horizontal seismic isolation means 24 made of laminated rubber is installed on the upper part of the inner cylinder member 14, and a support structure 26 such as a building is placed thereon.

  In this embodiment, the rolling seal mechanism 22 has a structure in which two rubber diaphragms (an inner diaphragm 30 and an outer diaphragm 32 are overlapped), and both diaphragms 30 and 32 are positioned at their folded deformation portions 30a and 32a. In this state, they are attached to the inner cylinder member 14 and the outer cylinder member 10 by the fasteners 34 at both ends, respectively, and these attachment portions are constantly pressed by the air spring internal pressure to maintain airtightness. Between the diaphragms 30 and 32 is an intermediate pressure region p, and gas is filled to a pressure (intermediate pressure) that is approximately half the pressure of the high-pressure air chamber.

  When the support structure (building) 26 moves up and down due to the earthquake motion, the inner cylinder member 14 also moves up and down. At this time, the orifice 20 provides resistance to the air flow between the inner cylinder air chamber 16 and the outer cylinder air chamber 18 and functions to absorb vertical vibration energy during an earthquake. The double diaphragms 30 and 32 move in the vertical direction with a half stroke of the inner cylinder member 14 while maintaining the intermediate pressure space. Therefore, differential pressure is applied to the outer diaphragm 32 and the inner diaphragm 30.

  The double diaphragms 30 and 32 are configured such that a spacer is interposed and a gas flow path is formed by the spacers without being completely adhered to other than the folded portion. Here, a linear convex pattern 30b connected integrally in the vertical direction is formed on the outer surface of the inner diaphragm 30, and this serves as a spacer so that the internal gas can flow and transmit the gas pressure in the concave groove portion. It has become. And in order to detect the gas pressure of the intermediate pressure range p between diaphragms, a pressure detection system (the piping 40, the pressure detector 42, etc.) is installed.

  With such a configuration, it is possible to detect leakage of the diaphragm by monitoring the gas pressure in the intermediate pressure region p between the diaphragms 30 and 32 by the pressure detector 42. In addition, if an inert gas such as nitrogen is introduced into the intermediate pressure region p, flame retardancy can be imparted.

  As in this embodiment, the internal pressure of the air spring can be doubled by double the diaphragm. For example, when a rolling seal mechanism with a double diaphragm structure using a rubber membrane material with a rated pressure resistance of the diaphragm of 1.6 Mpa is incorporated, a double 3.2 Mpa air spring can be configured, and the diameter of the air spring with the conventional pressure Can be reduced to 0.7 times (1 / √2). For example, an air spring having a diameter of approximately 3 m in the inner cylindrical member in the conventional structure can be reduced to about 2 m.

  The number of diaphragms to be stacked is not limited to two, and three or more sheets can be stacked. In that case, the positions of the folding deformation portions of the diaphragms are attached while being sequentially shifted, and the gas spaces between the diaphragms are gradually increased in pressure from the outside toward the inside. The internal pressure of the air spring can be increased by the number of diaphragms stacked, and the diameter of the air spring can be reduced to (1 / √n: n is the number of diaphragms). As a result, the limit of the air spring internal pressure, which has been determined by the diaphragm pressure limit so far, can be set to a high pressure that does not depend on the limit.

  In the conventional structure with one diaphragm, the leakage of the diaphragm immediately led to the functional damage of the air spring. However, when a plurality of diaphragms are stacked as in the present invention, the functional damage does not occur at one time. Further, by detecting the pressure in the gas space between the diaphragms, it is possible to prevent functional damage of the rolling seal mechanism.

  The above embodiment shown in FIG. 1 is a three-dimensional seismic isolation device in which the high pressure air spring type seismic isolation device of the present invention is combined with horizontal seismic isolation means made of laminated rubber. It is also possible to use it. The present invention is useful for seismic isolation and vibration isolation of various facilities and devices. When the support structure is a large structure such as a reactor building, in addition to the three-dimensional seismic isolation device using the present invention, by arranging a rocking suppression device by a hydraulic mechanism around the structure, In addition to isolating vibrations in both vertical and horizontal directions, rocking can be suppressed.

Explanatory drawing which shows one Example of the high pressure air spring type seismic isolation apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Outer cylinder member 12 Foundation 14 Inner cylinder member 16 Inner cylinder air chamber 18 Outer cylinder air chamber 20 Orifice 22 Rolling seal mechanism 24 Horizontal seismic isolation means 26 Support structure 30 Inner diaphragm 32 Outer diaphragm

Claims (5)

A high pressure structure in which the inner cylinder member and the outer cylinder member are combined so as to be relatively movable in the axial direction, and the gap between the inner cylinder member and the outer cylinder member is partitioned by a rolling seal mechanism to define a high-pressure air chamber. In the air spring type seismic isolation device,
The rolling seal mechanism has a structure in which a plurality of diaphragms are stacked and attached with the positions of the folded-back deformation portions of the diaphragms shifted, and the internal pressure between the diaphragms is gradually increased. High pressure air spring type seismic isolation device.   2. The high-pressure air spring type seismic isolation system according to claim 1, wherein a spacer is interposed between the diaphragms to thereby form a gas flow path, and a pressure detection system for detecting a gas pressure between the diaphragms is provided. apparatus.   The high-pressure air spring type seismic isolation device according to claim 1 or 2, wherein the spacer interposed between the diaphragms is a convex pattern integrally formed on a surface of a rubber diaphragm.   The high-pressure air spring type seismic isolation device according to any one of claims 1 to 3, wherein an inert gas is filled between the diaphragms. A three-dimensional seismic isolation device using the high-pressure air spring type seismic isolation device according to any one of claims 1 to 4 and provided with horizontal seismic isolation means made of laminated rubber in series.

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