JPH1122242A - Rolling seismic isolation device - Google Patents

Abstract

(57) [Abstract] [Problem] To introduce a seismic isolation device that has a simple structure and is maintenance-free while keeping the height of the seismic isolation device low, and has the effect of reducing vibration during an earthquake and increases the safety of buildings. Make it easier. A seismic isolation part (3) in which a stainless steel sphere (32) is rotatably arranged in a plurality of circular holes (31) opened in a stainless steel plate (30) in a lower support part (2) having a horizontal stainless steel lower plate (20) on the upper surface. At the top of the seismic isolation part 3,
Upper support 4 with lower surface made of horizontal stainless steel upper plate 40
And the lower supporting part 2 and the upper supporting part 4 are connected to the seismic isolation part 3.
Are provided so as to be relatively movable with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling seismic isolation device for reducing a vibration caused by a horizontal external force during an earthquake.

[0002]

SUMMARY OF THE INVENTION In recent years, in order to achieve seismic isolation of buildings during an earthquake, the development of laminated rubber effective for seismic isolation has led to the development of laminated rubber using natural rubber, high-damping laminated rubber, and lead plugs. A highly reliable and high performance laminated rubber seismic isolation device using laminated rubber or the like has been proposed.
On the other hand, as a seismic isolation device using a material other than the laminated rubber, a device configured to perform a sliding bearing and a rolling bearing has been proposed. In the recent Great Hanshin-Awaji Earthquake, many buildings with seismic isolation devices have been constructed since the vibration reduction effect and safety of the seismic isolation devices were confirmed from the buildings with seismic isolation devices. It has become to. However, such a seismic isolator using a laminated rubber seismic isolator, a sliding bearing, and a rolling bearing is expensive and requires maintenance, and the high height of the seismic isolator is a problem. . In view of the above circumstances, it is an object of the present invention to make the configuration simple and maintenance-free while keeping the height of the seismic isolation device low, which has an effect of reducing vibration during an earthquake and enhances the safety of the building. The purpose is to make it easier to introduce seismic isolation devices.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a plurality of circular openings formed in a stainless steel plate above a lower support portion having a horizontal stainless steel lower plate as an upper surface. A seismic isolation part with a stainless steel sphere rotatably arranged in each hole is arranged, and an upper support part with a horizontal stainless steel upper plate on the lower surface and a mounting surface on the upper surface is arranged above the seismic isolation unit. The lower support portion and the upper support portion are provided so as to be relatively movable with respect to each other via the seismic isolation portion. is there. In the present invention, it is preferable that the upper support is connected to the lower support via damping means for attenuating a roll caused by a horizontal external force during an earthquake.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. In the figure, reference numeral 1 denotes a rolling seismic isolation device, which is arranged, for example, between a lower part of a base floor of a building and a building part above the base floor. As shown, the rolling seismic isolation device 1 is composed of a lower support part 2, a seismic isolation part 3, and an upper support part 4, and the lower support part 2 is provided with the rolling seismic isolation apparatus 1. And a horizontal stainless steel lower plate 20 fixed to the lower structure. Further, the upper support 4 is provided with the rolling seismic isolation device 1.
Is fixed to the structure on the upper side so as to receive the structure on the upper side where it is disposed, and has a horizontal stainless steel upper plate 40 on the lower surface, and a mounting surface 41 serving as an upper surface. To receive the upper structure (the mounting surface 41).
Is fixed to the upper structure). The seismic isolation part 3 is interposed between the lower support part 2 and the upper support part 4, and enables the lower support part 2 and the upper support part 4 to relatively move in the horizontal direction. As shown in the figure, the seismic isolation part 3 has a plurality of circular holes 31 opened in a stainless steel plate 30 at a predetermined interval, and a stainless steel sphere 32 having the same diameter can be rotated in each of the circular holes 31. Has been placed.
The seismic isolation part 3 is disposed on the stainless steel lower plate 20 of the lower support part 2 so that the stainless steel sphere 32 is in contact with the stainless steel lower plate 20. The upper support part 4 is arranged on the seismic isolation part 3 such that the upper plate 40 is in contact with the upper plate 40. Reference numeral 42 in the figure is a dustproof cover. As described above, the lower support portion 2 and the upper support portion 4 face each other up and down via the seismic isolation portion 3, and the horizontal stainless steel lower plate 20 of the lower support portion 2 and the horizontal stainless steel upper plate of the upper support portion 4 are provided. A plurality of stainless steel spheres 32 of the seismic isolation part 3
The lower support portion 2 and the upper support portion 4 can move relative to each other in the horizontal direction due to the interposition of the stainless steel spheres 32. The load of the building is transmitted to the structure side of the building below through the rolling isolation device 1. When a horizontal external force is applied to the building during an earthquake, the lower support portion 2 and the upper support portion 4 of the rolling seismic isolation device 1 move relative to each other, and allow some movement (residual displacement) of the building during the earthquake. I will be.

FIG. 4 shows a building 5 having a seismic isolation structure using the above-described rolling seismic isolation device 1, wherein a building having poor vibration resistance or an old building having an old building style is separated from a base portion 6. The rolling seismic isolation device 1 is interposed between the base portion 6 and the upper building portion 7 by jacking up or the like. As shown in the figure, on the base portion 6 side, a plurality of lower support portions 2 are connected to each other, or one lower support portion 2 is provided so as to extend over a wide range. In the above, the combined seismic isolation part 3 and upper support part 4 are arranged at a plurality of locations, and furthermore, the base part 8 of the building part 7 is placed on these upper support parts 4 so that It is supported by the vibration device 1. The lower support is fixed to the base, and the upper support is fixed to the bottom. In each of the rolling seismic isolation devices 1 in the building 5, each upper support portion 4 is connected to a fixed portion 10 on the lower support portion side through damping means 9 composed of a spring, a damper, or the like. The damping means attenuates the roll while resisting the roll caused by the horizontal external force applied at the time of the earthquake by the restoring force of the spring or the damper, and damping means 9 for damping the roll by the restoring force. Since the rolling seismic isolation device 1 that supports the load of the building is separated, the load isolation and the damping of the roll must be borne by a single seismic isolator as in the case of using the conventional laminated rubber. Compared with the conventional apparatus which must be used, even if the building part is lightweight, it is possible to easily prolong the shaking period.

[0006]

As described above, the rolling seismic isolation device of the present invention has a plurality of circular holes opened in the stainless steel plate on the upper portion of the lower supporting portion having a horizontal stainless steel lower plate. A seismic isolation unit comprising a stainless steel sphere that is rotatably arranged is arranged, and an upper support unit with a horizontal stainless steel upper plate on the lower surface and a mounting surface on the upper surface is arranged above the seismic isolation unit. The lower support portion and the upper support portion are provided so as to be relatively movable with each other via the seismic isolation portion. In this way, the stainless steel upper plate and the stainless steel lower plate are vertically opposed to each other via the seismic isolation part with stainless steel spheres. The use of a material reduces aging, and the use of a dustproof cover eliminates the need for routine maintenance. In addition, since the lower support portion and the upper support portion are configured to be movable relative to each other in the horizontal direction, it is easy to reduce the height of the rolling seismic isolation device itself, and the rolling seismic isolation device is installed. The construction work can be simplified. For this reason, by using this rolling seismic isolation device for existing buildings with inadequate earthquake resistance or old buildings with old architectural styles, the appearance of the building can be further changed with simple construction and without much cost. Thus, it is possible to improve the vibration resistance of those buildings without having any effect. If the upper support section is connected to the lower support section via damping means for attenuating the roll due to horizontal external force during an earthquake, as in a conventional laminated rubber seismic isolation device, etc. It is easier to select a damping means having a characteristic according to the weight of the building part, and the wooden part is lighter than the conventional equipment, in which the building cannot be made longer unless a certain upper load is applied. This makes it possible to easily extend the rolling period of a building or a small building.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cross section of an example of a rolling seismic isolation device according to the present invention.

FIG. 2 is an explanatory view showing a seismic isolation unit viewed from below in the same example.

FIG. 3 is an explanatory view showing the seismic isolation part in an example in an enlarged state.

FIG. 4 is an explanatory view showing a building having a seismic isolation structure using an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rolling seismic isolation device 2 ... Lower support part 20 ... Stainless steel upper plate 3 ... Seismic isolation part 30 ... Stainless steel plate 31 ... Circular hole 32 ... Stainless steel sphere 4 ... Upper support part 40 ... Stainless steel lower plate 5 ... Building 9 ... Attenuation means

Claims (2)

[Claims] 1. A seismic isolator having a stainless steel sphere rotatably disposed in each of a plurality of circular holes opened in a stainless steel plate, on an upper portion of a lower support having a horizontal stainless steel lower plate as an upper surface. And an upper support having a horizontal stainless steel upper plate as a lower surface and an upper surface as a mounting surface is disposed above the seismic isolation part, and the lower support part and the upper support part serve as the seismic isolation part. The rolling seismic isolation device is provided so as to be relatively movable with respect to each other. 2. The rolling seismic isolation device according to claim 1, wherein the upper support is connected to the lower support via damping means for attenuating roll due to horizontal external force during an earthquake.