JPH03272345A - Three dimensional earthquake proof device - Google Patents

Abstract

PURPOSE:To obtain favourable earthquake proof performance by providing a vertical slide bearing part for constraining relative displacement in the horizontal direction of an earthquake proof floor and a sliding door and a horizontal constraint guide provided with a spheric bearing for allowing dislocation of a degree of parallelism between the earthquake proof floor and the sliding plate. CONSTITUTION:Even when an earthquake occurs in the case when a degree of parallelism of an earthquake-proof floor 6 and a sliding plate 4 is not maintained, a rolling spheric body 16 held on a spherical seat 14 rolls freely and sliding of a guide rod 10 in the shaft center direction can be allowed, and accordingly, vertical relative displacement of the earthquake proof floor 6 and the sliding plate 4 is absorbed to be free from earthquake vibration by elastic displacement of an air spring 5 without being constrained. Additionally, an earthquake force in the horizontal direction can be avoided by way of sliding and escaping relatively in the horizontal direction, however, as the sliding plate 4 is constrained to move horizontally with the earthquake floor 6 in one body by a horizontal constraint guide 13a at this time, there is not possibility that the air spring 5 is buckled. Consequently, it is possible to obtain extremely excellent earthquake proof performance.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a three-dimensional seismic isolation device.

[Conventional technology] In recent years, seismic isolation floor systems have been put into practical use in control rooms and computer rooms where complex and ultra-precise equipment and computers that are sensitive to vibration are installed, to protect such equipment from vibrations such as earthquakes. .

FIG. 5 shows an example of a three-dimensional seismic isolation device used in the above-mentioned seismic isolation floor system. A sliding bullet 4 is placed on the sliding plate 4, which can be slid horizontally with a frictional resistance of Moreover, the upper end of the air spring 5 is fixed to the lower surface of the seismic isolation floor 6 to support the seismic isolation floor 6.

In the figure, reference numeral 7 indicates a displacement control coil spring disposed around the sliding plate 4 to prevent the sliding plate 4 from sliding beyond the width of the base plate 3.

Therefore, when an earthquake occurs and seismic force acts on the building, the vertical seismic force is isolated by the vertical elastic displacement of the air spring 5, and the horizontal seismic force is absorbed by the sliding plate on the base plate 3. 4 slides relative to each other in the horizontal direction and escapes, resulting in seismic isolation.

[Problems to be Solved by the Invention] However, in the three-dimensional seismic isolation device 1 as described above, since the deformation performance of the air spring 5 in the horizontal direction is small, there is a drawback that the air spring 5 is easily buckled.

Therefore, as shown in Fig. 6, a piston-type horizontal structure is installed between the seismic isolation floor 6 and the sliding plate 4, which restrains both of them horizontally and can expand and contract to accommodate relative displacement in the vertical direction. It has been considered to prevent buckling of the air spring 5 by installing a restraining guide 8.

However, in reality, the parallelism between the seismic isolation floor 6 and the sliding plate 4 is often not maintained due to the loading conditions of the seismic isolation floor 6, manufacturing precision, etc., so a simple piston-type horizontal restraint guide as described above is used. To set up 8,
There is a risk that galling may occur in the sliding portion of the horizontal restraint guide 8, restraining relative displacement in the vertical direction as shown by the two-dot chain line in FIG. There was.

The present invention has been made in view of the above-mentioned actual situation, and even when the parallelism between the seismic isolation floor and the sliding plate is not maintained, the relative displacement in the vertical direction between the seismic isolation floor and the sliding plate is restrained. It is an object of the present invention to provide a three-dimensional seismic isolation device equipped with a horizontal restraint guide that can restrain a seismic isolation floor and a sliding plate reliably in the horizontal direction.

[Means for Solving the Problems] The present invention includes a horizontally movable sliding plate placed on a base plate fixed to a building floor, a lower end of which is fixed onto the sliding plate, and an upper end of which is seismically isolated. In a three-dimensional seismic isolation device in which the seismic isolation floor is supported by an elastic member fixed to the floor and capable of elastic displacement in the vertical direction, there is a space between the seismic isolation floor and the slide ink plate in the horizontal direction of both. The present invention is characterized by comprising a horizontal restraining guide having a vertical sliding bearing portion that restrains the relative displacement of the two, and a spherical bearing portion that allows deviation in parallelism between the two.

[Function] Therefore, in the present invention, even if an earthquake occurs when the parallelism between the seismic isolation floor and the sliding plate is not maintained, relative displacement in the vertical direction between the seismic isolation floor and the sliding plate is not allowed. In addition, the seismic isolation floor and the sliding plate are restrained in the horizontal direction.

[Implementation example] Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show one embodiment of the present invention, and parts in the drawings with the same reference numerals as in FIG. 5 represent the same parts.

In the three-dimensional seismic isolation device 9, which is configured in substantially the same manner as the three-dimensional seismic isolation device l shown in FIG. , a guide rod 1o extending a required length in a direction perpendicular to the lower surface.
The upper end of the guide rod 1o is fixed, and a guide Ell is provided upright on the upper surface of the sliding plate 4 facing the guide rod 1o.
It is fitted into the guide cylinder 11 via a spherical sliding bearing mechanism 12 configured inside, thereby forming a horizontal restraining guide 13a.

Here, the spherical sliding bearing mechanism 12 includes a spherical seat 14 attached to the inner peripheral surface of the upper part of the guide cylinder 11, and is held by the spherical seat 14 in a freely removable manner and is attached to the guide rod 1.
A rolling ball 16 has a through hole 15 into which the lower part of the sliding plate 4 is slidably inserted. A vertical sliding bearing portion 17a that restrains relative displacement in the horizontal direction is configured, and a spherical bearing portion 18a that allows deviation in parallelism between the seismic isolation floor 6 and the sliding plate 4 by the transfer sphere 16 and the spherical seat 14. It is configured.

Therefore, even if an earthquake occurs when the parallelism between the seismic isolation floor 6 and the sliding plate 4 is not maintained as shown in FIG. 2, the transfer sphere 16 held by the spherical seat 14 is free. Since the guide rod 10 can be allowed to slide in the axial direction, the vertical relative displacement between the seismic isolation floor 6 and the sliding bullet 4 is not restricted, but is caused by the elastic displacement of the air spring 5. The seismic force in the vertical direction is absorbed by the earthquake.

Also, the seismic force in the horizontal direction is isolated by sliding relative to the sliding plate 4 in the horizontal direction on the base plate 3, or at this time, the sliding plate 4 is seismically isolated by the horizontal restraint guide 13a. Since it is restrained to horizontally move integrally with the floor 6, there is no possibility that a relative displacement in the horizontal direction will occur between the seismic isolation floor 6 and the sliding plate 4 and the air spring 5 will buckle.

Therefore, according to the above, even if an earthquake occurs when the parallelism between the seismic isolation floor 6 and the sliding plate 4 is not maintained, the vertical relative displacement between the seismic isolation floor 6 and the sliding plate 4 is restrained. Since the seismic isolation floor 6 and the sliding plate 4 can be restrained in the horizontal direction without causing any You can get it.

FIG. 3 shows another embodiment of the three-dimensional seismic isolation device of the present invention, which includes a guide tube 19 erected on the upper surface of the sliding plate 4, and a guide tube 19 attached to the inner peripheral surface of the guide tube 19 so as to be movable up and down. The vertical sliding bearing part 17b is formed by the spherical seat 20, and is formed at the lower end of the spherical seat 20 and a guide rod 21 whose upper end is fixed to the lower surface of the seismic isolation floor 6, and is held movably by the spherical seat 20. This is an example including a horizontal restraining guide 13b which constitutes a spherical bearing part 18b with a spherical part 22.

FIG. 4 shows still another embodiment of the three-dimensional seismic isolation device of the present invention, in which a guide cylinder 23 whose upper end is fixed to the lower surface of the seismic isolation floor 6 is shown.
and the upper part of the guide rod 26, which is movably held by a spherical seat 25 with a spherical part 24 formed at the lower end attached to the upper surface of the sliding plate 4, constitute a vertical sliding bearing part 17c. Spherical seat 25
The horizontal restraint guide 1 constitutes the spherical bearing part 18c by
．． This is an example equipped with 3c.

In addition, the horizontal restraint guide 13 in all the embodiments described above
a, 13b, and 13c may be attached to the seismic isolation floor 6 and sliding plate 4 by turning the illustrated structure upside down, and these horizontal restraining guides 13a,
13b and L3c may be installed inside the air spring 5 instead of near the air spring 5.

Note that the three-dimensional seismic isolation device of the present invention is not limited to the above-described embodiments, and the elastic member that can be elastically displaced in the vertical direction is not limited to an air spring, but a coil spring or the like may be used. Of course, various modifications may be made without departing from the gist of the invention.

[Effects of the Invention] As explained above, according to the three-dimensional seismic isolation device of the present invention, even if an earthquake occurs when the parallelism between the seismic isolation floor and the sliding plate is not maintained, the seismic isolation It is possible to allow relative displacement in the vertical direction between the floor and the sliding ink plate without restraining it, and to restrain the seismic isolation floor and the sliding plate in the horizontal direction, thereby reliably preventing buckling of the resilient member. It is possible to achieve the excellent effect of obtaining extremely good seismic isolation performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of FIG. 1, FIG. 3 is a sectional view of another embodiment of the present invention, and FIG. Sectional view showing another embodiment, No. 5
The figure is a front view showing an example of a three-dimensional seismic isolation device used in a seismic isolation floor system, and FIG. 6 is a sectional view showing a conventional example. In the figure, 2 is the building floor, 3 is the base plate, 4 is the sliding plate, 5 is the air spring (resilient member), 6 is the seismic isolation floor, 9 is the three-dimensional seismic isolation device, 13a, 13b, 13c are horizontal restraint guides, 17a, 17b, and 17c are vertical sliding bearing parts, and 18a, 18b, and 18c are spherical bearing parts. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) A sliding plate that can slide horizontally is placed on a base plate fixed to the building floor, and its lower end is fixed to the sliding plate, and its upper end is fixed to the seismic isolation floor so that it can be elastically displaced in the vertical direction. In the three-dimensional seismic isolation device in which the seismic isolation floor is supported by a resilient member, a vertical sliding bearing portion is provided between the seismic isolation floor and the sliding plate to restrain relative displacement in the horizontal direction between the two; A three-dimensional seismic isolation device characterized by comprising a horizontal restraint guide having a spherical bearing portion that allows deviation in parallelism between the two.