JPH1161739A - Vibration isolation device for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolation device for a structure, in which a vibration damping function, particularly a high-frequency vibration component is not generated by improving the long-term stability of the sliding surface of a plain bearing body while enhancing energy absorption. SOLUTION: In an elastic plain bearing body 4, a sliding plate 5 composed of a metallic material such as stainless steel is fixed onto a support base body 1, a support member 6 such as a mounting steel pipe installed onto the underside of a structure to be supported 2 and a laminated rubber 7 are mounted on the sliding plate 5 and a Teflon material such as PTFE is disposed onto the underside of the laminated rubber 7. The sliding surfaces X of the sliding plate 5 and the laminated rubber 7 or the whole elastic plain bearing body 4 is covered and hermetically sealed with a cylindrical or hourglass-shaped bag body 8 consisting of a flexible material such as a rubber sheet and both ends of the bag body 8 are fixed onto the outer circumferential surface of the support member 6 and the support base body 1 in watertight and airtight manners.

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 for a building structure such as a building, a detached house, and a civil structure such as a bridge. The present invention relates to a seismic isolation device for a structure in which installed secondary members (for example, computer equipment, measuring instruments, chests, bookcases, decorations, etc.) are prevented from collapsing during an earthquake.

[0002]

2. Description of the Related Art Conventionally, as a seismic isolation device for a structure, a laminated rubber bearing in which a rubber sheet having a low shear modulus and an intermediate steel plate are alternately laminated is known, and in order to increase the natural period of the laminated rubber bearing. However, it is necessary to lower the shear rigidity in the horizontal direction, but there is a problem that it is difficult to realize a natural period of 4 to 5 seconds due to limitations.

[0003] For this reason, there has been proposed a "slide bearing" in which a concrete surface is covered with a metal such as stainless steel or Teflon, and does not have a natural period of sliding relatively while supporting a load. However, flat sliding bearings have no restoring force, and pendulum-type seismic isolation devices with curved sliding surfaces have been developed. In this pendulum-type seismic isolation device, the natural period is determined only by the curved surface shape without depending on the mass.

Recently, an "elastic sliding bearing" in which a sliding material is joined to one end of a laminated rubber portion has been developed and used in combination with a conventional laminated rubber bearing. In this elastic sliding bearing, the laminated rubber bearing has a restoring force, and the elastic sliding bearing has an isolator function and a damper function due to frictional resistance during sliding. The degree of freedom of seismic isolation cycle and damping performance design can be increased by adjusting the weight ratio of the upper object shared by the elastic sliding bearing.

[0005]

However, in each of the above-mentioned seismic isolation devices, the sliding bearing portion is in an open state. There was a problem in the maintenance for stabilizing over a long period of time. Further, in order to realize the chemical stability of the sliding surface (sliding surface) and the low coefficient of friction, it is considered that one of the sliding surfaces is made of a stainless steel plate and the other is made of a Teflon-based material such as PTFE. However, there is a problem that this combination is vulnerable to wear.

[0006] Furthermore, the laminated rubber and the flexible film body are integrally manufactured, and oil is filled to a level at which the sliding surface is immersed, used as a lubricant at the time of relative sliding, and the friction coefficient is lowered to reduce the lateral rigidity. Although it has been proposed to reduce the coefficient of friction, the hysteresis loop is small due to the low coefficient of friction, and there is a problem that the energy absorption cannot be sufficiently obtained. A `` plate boundary type earthquake, '' which occurs when two seafloor plates are displaced from each other, involves a sensible earthquake and a tsunami, with a clay layer or mud layer interposed between the marine and continental plates. Then, it is known that the vibration of the continental plate becomes slow, and an earthquake that does not include a high-frequency component in the seismic motion, that is, a so-called “tsunami earthquake”, is not felt.

As described above, the slip phenomenon involves a problem of high-frequency vibration, and therefore, there is a problem that the conventional slide bearing device is also damaged by high-frequency vibration. The object of the present invention is to enhance the long-term stability of the sliding surface of the sliding bearing body, and at the same time, enhance the energy absorption to reduce the vibration,
In particular, it is an object of the present invention to provide a seismic isolation device for a structure that does not generate a high-frequency vibration component.

According to the present invention, in order to achieve the above object, the periphery of the sliding bearing is covered and sealed with a bag made of a flexible material, and a fluid is applied to the inside of the bag to fine particles made of inorganic or organic material. The gist of the invention is that the impregnated high-viscosity material is sealed. Further, the gist of the present invention is that the periphery of the sliding bearing is covered and sealed with a bag made of a flexible material, and an inert gas is sealed inside the bag.

As described above, according to the present invention, the periphery of the sliding surface of the sliding bearing or the whole of the bearing device is covered and sealed by the bag made of a flexible material, so that the sliding surface of the sliding bearing is free of foreign matter. Can be prevented from invading, and oxidative deterioration due to moisture and salt damage can be prevented, and the sliding surface of the sliding bearing can be stabilized for a long period of time. The sliding surface can be further chemically stabilized by filling an inert gas into the hollow portion covered by the bag.

In addition, a natural clay impregnated with oil or a high-viscosity material such as a putty-like substance is sealed in the hollow portion covered by the bag, and brought into contact with the sliding surface of the sliding bearing. Thereby, the absorption of the energy of the high frequency vibration is promoted.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a seismic isolation device showing a first embodiment of the present invention, in which a support base 1 such as a concrete foundation of a building structure or an abutment of a civil engineering structure of a bridge, and a building or civil engineering cover. Between the support structure 2, a laminated rubber bearing 3 in which a plurality of rubber sheets and intermediate steel plates are alternately laminated is disposed outside, and a plurality of elastic sliding bearings 4 are disposed inside at predetermined intervals. .

As shown in FIG. 1, the elastic sliding support 4 has a sliding plate 5 made of a metal material such as stainless steel fixed on a supporting base 1 and a supported plate is provided on the sliding plate 5. A support member 6 such as a steel pipe attached to the lower surface of the structure 2 and a laminated rubber 7 are attached, and a Teflon-based material such as PTFE is disposed on the lower surface of the laminated rubber 7. The sliding surface X between the sliding plate 5 and the laminated rubber 7 or the entire elastic sliding bearing 4 is covered and sealed by a cylindrical or shrouded bag 8 made of a flexible material such as a rubber sheet. Both ends of the bag 8 are fixed to the outer peripheral surface of the support member 6 and the support base 1 in a watertight and airtight manner.

Thus, the sliding surface X of the elastic sliding bearing member 4
The sliding surface of the elastic sliding support 4 can be stabilized for a long period of time by preventing foreign substances from entering the surface, preventing oxidation deterioration due to moisture and salt damage, and the like. The bag 8 is filled with a high-viscosity material W such as inorganic fine particles of natural clay or the like impregnated with oil or putty-like organic materials used as a sealing material or the like. The high-viscosity material W comes into contact with the sliding surface X between the sliding plate 5 and the laminated rubber 7. Thereby, the high-viscosity material W becomes a resistance when the support base 1 and the supported structure 2 move, thereby facilitating the absorption of high-frequency vibration energy.

FIG. 2 shows a second embodiment of the elastic sliding bearing 4, in which a sliding plate 5 made of a metal material such as stainless steel fixed on a supporting base 1 and a lower surface of a supported structure 2 are provided. A predetermined gap h is provided between the support member 6 such as an attached steel pipe and the cover member 8 is covered with a bag body 8 made of a flexible material. A high-viscosity material W similar to that of the first embodiment is sealed in a gap h between the first and second embodiments. Note that a Teflon-based material may be disposed on the lower surface of the support member 6 as necessary.

FIGS. 3 to 5 show a third embodiment of the elastic sliding bearing 4 which comprises a sliding plate 5 made of a metal material such as stainless steel fixed on a supporting base 1 and a supported structure 2. A predetermined gap h is provided between a supporting member 6 such as a steel pipe attached to the lower surface of the sliding member 5 and a sliding surface X between a horizontal surface of the sliding plate 5 and a horizontal lower surface of the supporting member 6 is provided on the supporting base 1. Also, a guide groove 9 through which the highly viscous fluid W can enter and exit when the supported structure 2 moves in the horizontal direction as indicated by the arrow. If necessary, a Teflon-based material may be disposed on the lower surface of the support member 6.

The guide groove 9 is a concentric groove with the center O of the sliding surface X as a fulcrum, and the cross section of the guide groove 9 is formed in an arc shape or a triangular shape. By forming in this manner, even if the support base 1 and the supported structure 2 move in the horizontal direction as shown by the arrows, the high-viscosity material W is always stored in the guide groove 9, The high frequency vibration energy can be absorbed by the resistance force of the viscous material W.

FIG. 6 shows a fourth embodiment of the elastic sliding bearing member 4, which is a sliding plate 5 made of a material such as Teflon-based material or stainless steel fixed on the supporting base 1. A predetermined gap h is provided between the support member 6 such as a steel pipe attached to the lower surface of the supported structure 2 and the sliding surface X is air-tightly covered with a bag 8 made of a flexible material. An inert gas G is sealed from the valve 14 into the inside of the bag body 8 to prevent foreign matter from entering the sliding surface X, and to prevent oxidative deterioration due to moisture and salt damage. And the sliding surface X is chemically stabilized.

FIGS. 7 and 8 show fifth and sixth embodiments of the sliding bearing 4a. In this embodiment, the sliding plate 5 of the supporting base 1 and the supporting member 6 of the supported structure 2 are connected to each other. A spherical concave support surface 11a and a spherical convex support surface 11b fitted to the spherical concave support surface 11a, or the sliding plate 5, the support member 6, and the semi-circular concave surfaces 12, 12. Is formed, and a substantially elliptical sphere 13 is fitted to the concave surfaces 12 and 12.

The sliding surface X is hermetically covered with a bag 8 made of a flexible material, and the bag 8 is filled with a highly viscous material W or an inert gas G. is there. As shown in the fifth and sixth embodiments, the sliding surface X
Is formed on a curved surface so that the natural period is not affected by the mass and the high-viscosity material W absorbs the energy of the high-frequency vibration, or the inert gas G chemically stabilizes the sliding surface X. It is composed.

[0020]

According to the present invention, the sliding surface of the sliding bearing is sealed by covering the periphery of the sliding bearing or the entire bearing device with a bag made of a flexible material as described above. By preventing foreign substances from entering the surface or by filling an inert gas, it is possible to prevent oxidative deterioration due to moisture and salt damage, and to stabilize the sliding surface of the sliding bearing for a long period of time. By enclosing a high-viscosity material in which fluid is impregnated with inorganic fine particles or organic fine particles in the hollow portion covered by the bag, and abutting the sliding surface of the sliding support body,
The occurrence of high frequency vibration can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a partial sectional view of a seismic isolation device showing a second embodiment of the present invention.

FIG. 3 is a partial sectional view of a seismic isolation device showing a third embodiment of the present invention.

FIG. 4 is a plan view taken along the line AA of FIG. 3;

FIG. 5 is a partially enlarged sectional view of a sliding surface of FIG. 3;

FIG. 6 is a partial sectional view of a base isolation device according to a fourth embodiment of the present invention.

FIG. 7 is a partial sectional view of a seismic isolation device showing a fifth embodiment of the present invention.

FIG. 8 is a partial sectional view of a seismic isolation device showing a sixth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Support base 2 Supported structure 3 Laminated rubber bearing 4 Elastic sliding bearing 5 Sliding plate 5 6 Support member 7 Laminated rubber 8 Bag 9 Guide groove 14 Valve 11a Concave supporting surface 11b Convex supporting surface 12 Concave surface 13 Spherical X Sliding surface, O center, h gap, G inert gas.

Claims (5)

[Claims] 1. A seismic isolation device for a structure comprising a plurality of laminated rubber bearings and a sliding bearing between a supporting base and a supported structure, wherein the periphery of the sliding bearing is flexible. A seismic isolation device for a structure in which a high-viscosity material in which a fluid is impregnated with inorganic fine particles or organic fine particles is sealed inside the bag and covered and sealed with a bag made of a material. 2. The sliding bearing body has a sliding plate of a supporting base and a supporting member of a supported structure formed on a horizontal sliding surface, and at least one of the sliding surfaces allows the highly viscous material to enter and exit. The seismic isolation device for a structure according to claim 1, wherein the guide groove is formed. 3. The seismic isolation of a structure according to claim 1, wherein the guide groove is a concentric groove with the center of a sliding surface as a fulcrum, and the cross section of the groove is an arc or a triangle. apparatus. 4. The seismic isolation device for a structure according to claim 1, wherein the sliding bearing body has a sliding plate of a support base and a support member of a supported structure formed on a spherical support surface. 5. A seismic isolation device for a structure having a plurality of sliding bearings disposed between a supporting base and a supported structure, wherein a bag made of a flexible material is formed around the sliding bearings. A seismic isolation device for a structure that is covered and sealed by a body and sealed with an inert gas inside the bag body.