JPH0674670B2 - Seismic isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a seismic isolation device used for structures, seismic isolation floors and the like.

[Prior Art] Conventionally used seismic isolation devices mainly support a supported body using laminated rubber in which steel plates and rubber are alternately laminated. However, when the steel plates and the rubber are alternately laminated, the portions of the steel plates hardly elastically deform, so that there is a drawback that the height becomes high if sufficient elastic characteristics are obtained. Therefore, it was not suitable to use the existing building with a high height for seismic isolation structure.

[Problem to be Solved by the Invention] The present invention provides a seismic isolation device that is elastically deformable in a horizontal direction even if the height is low.

[Means for Solving the Problems] The present invention relates to an upper surface member having a horizontal contact surface on a lower surface attached to a supported body made of a rigid material, and a lower surface having a horizontal contact surface on an upper surface attached to a support made of a rigid material. A member, a spherical body made of a rigid material which is in contact with each contact surface of the upper surface member and the lower surface member and arranged therebetween, and a holding member made of a rigid material which is arranged between the upper surface member and the lower surface member to hold and guide the spherical body. A seismic isolation device comprising: a rubber member having an upper end fixed to an upper surface member and a lower end fixed to a holding member; and a rubber member having a lower end fixed to a lower surface member and an upper end fixed to a holding member. It is provided.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention shown in FIGS. 1 to 3, 10 is a supported body and 12 is a support body. 13 is a seismic isolation device according to the present invention.

The seismic isolation device 13 is arranged substantially horizontally to be fixed to the lower side of the supported body 10 and substantially fixed to the upper side of the upper surface member 14 and the support body 12 whose lower surface made of a rigid material such as metal is a horizontal contact surface 15. It has a lower surface member 16 arranged horizontally and having an upper surface made of a rigid material such as metal as a horizontal contact surface 17, and a fixing bolt penetrates the upper surface member 14 and the lower surface member 16 if necessary. Holes not shown may be punched. Reference numeral 18 denotes a sphere that supports a load based on gravity acting from a supported body 10 made of a rigid material such as steel or other metal or a synthetic resin and exerts on the support body 12, and each contact surface 15 of the upper surface member 14 and the lower surface member 16 The upper surface member 1
When the lower surface member 4 and the lower surface member 16 are relatively displaced in the horizontal direction, they roll. Reference numeral 20 denotes a guide member that holds and guides the sphere 18, and an opening 21 that surrounds the sphere 18 is formed. Reference numeral 22 denotes a rubber member whose upper end is fixed to the upper surface member 14 and lower end is fixed to the guide member 20, for example, a rubber member made of only four rubbers, and 23 is, for example, 4 whose upper end is fixed to the guide member 20 and lower end is fixed to the lower surface member 16.
It is a rubber member consisting of only one rubber. Rubber member 22,23
Is integrally constructed and attached as follows. That is, 24, 25 and 26 are metal members. The upper and lower ends of the rubber member 22 are baked onto the metal members 24 and 25, respectively, and the upper and lower ends of the rubber member 23 are baked onto the metal members 25 and 26, respectively. The metal member 24 and the rubber member 22 are penetrated through the hole 27 of the guide member 20 from below and fixed to the guide member 20 by the step portion 28 of the metal member 25 and the snap ring 29. Part of each of the metal members 24 and 26 penetrates the upper surface member 14 and the lower surface member 16 and is fixed by a snap ring 30. By doing this,
The rubber members 22 and 23 connect between the upper surface member 14 and the guide member 20 and between the guide member 20 and the lower surface member 16, respectively. It provides the damping force of.

In the structure as described above, when the upper surface member 14 and the lower surface member 16 are relatively displaced in the horizontal direction due to an earthquake or other causes as shown in FIG.
Is elastically deformed as shown in the figure, the guide member 20 moves in the horizontal direction, and the sphere 18 is also held by the guide member 20.
Roll along 5 and 17 to move. Each of the rubber members 22 and 23 gives a restoring force in the illustrated state, and FIG. 4 shows the restoring force F with respect to the horizontal displacement x, and the restoring force suddenly increases as the displacement increases. is there. In the case of an earthquake, the support member 12 reciprocates so that the upper surface member 14 and the lower surface member 16 are alternately displaced in opposite directions.

In another embodiment of the invention shown in FIG. 5, a plurality of spheres 18 are used.

FIG. 6 shows a seismic isolation floor using a plurality of seismic isolation devices 13 shown in FIGS. In this figure, 12 is a support consisting of the floor of the building, and 31 is the wall of the building. A beam 32 is supported by a plurality of seismic isolation devices 13, and its upper surface is covered with a large number of floor plates 33. The beam 32 and the floor plate 33 serve as the supported body 10 together with an article (not shown) supported on the floor plate. Reference numeral 35 is a step board, which covers a space 36 in which the beams 32 and the like are made movable and has a peripheral edge fixed to the wall 31.

In the present invention, the rubber members 22 and 23 may be integrally formed from rubber so as to penetrate the guide member 20. In addition, at least one rubber member 22 and 23 may be provided, and in such a case, the guide member 20 may be used as necessary.
It is also possible to form a portion which reaches the upper surface member 14 and the lower surface member 16 to prevent the inclination of the guide member. Also, rubber member 2
The mounting positions of 2, 23 may be changed without providing them vertically. In addition, the upper surface member 14 and the lower surface member 16
The heights of the respective contact surfaces 15 and 17 and the mounting positions of the rubber members 22 and 23 may be different from each other.

[Effects of the Invention] In the present invention, the load of the supported body 10 is supported by the spherical body 18 as described above, and the spherical body 8 is held and guided by the guide member 20, so that the rubber member 22, Since the laminated rubber is not used as 23, the height is remarkably reduced and the sphere 18 can be held at a predetermined position.

[Brief description of drawings]

1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a front view showing a displaced state, and FIG.
FIG. 5 is a characteristic diagram of a rubber member, FIG. 5 is a front view showing another embodiment of the present invention, and FIG. 6 is a front view showing a state in which the present invention is applied to a base isolation floor. 10 is a supported body, 12 is a support body, 13 is a seismic isolation device, 14 is an upper surface member, 15 is a contact surface, 16 is a lower surface member, 17 is a contact surface, 18 is a sphere, 20 is a guide member, 22 is a rubber member. , 23 are rubber members.

Claims (1)

[Claims] 1. An upper surface member made of a rigid material and having a horizontal contact surface on a lower surface attached to a supported body, a lower surface member made of a rigid member having a horizontal contact surface on an upper surface, and an upper surface member and a lower surface. Between the upper surface member and the guide member, a spherical body made of a rigid material that is in contact with each contact surface of the member and a guide member made of a rigid material that is arranged between the upper surface member and the lower surface member to hold and guide the spherical body. A seismic isolation device comprising a rubber member made of only rubber to be connected, and a rubber member made of only rubber to connect between a guide member and a lower surface member.