JPH063066B2 - Floor seismic isolation device - Google Patents

Description

The present invention relates to a seismic isolation device applied to a free access floor or the like.

[Conventional technology]

In recent years, a seismic isolation device for a free access floor has been developed and put into practical use in order to prevent the floor vibration from being transmitted to computers, OA equipment and the like.

This seismic isolation device is installed between the joists supporting the free-access floor and the building frame, and prevents horizontal vibrations that occur in the building frame during an earthquake or the like from being transmitted to the joists.

[Problems to be solved by the invention]

By the way, conventional seismic isolation devices are required to have a restoring force function to suppress relative horizontal displacement and to return joists moved by vibration to their original position, and a damping function to quickly converge shaking. .

Therefore, as shown in Japanese Patent Laid-Open No. 61-179972, as an example, a conventional seismic isolation device has a seismic isolation device and a restoration device separately manufactured, and a plurality of seismic isolation devices are provided at intervals. Was unavoidable with the drawback of becoming larger and more complex.

The present invention was devised to solve the above problems, and an object thereof is to provide a floor-based seismic isolation device having a simple structure and compact size.

[Means for solving problems]

The seismic isolation apparatus of the present invention is one in which joists located on the skeleton are supported by a support base, and the support base is provided with a restoring force function and a damping function. The support is slidably arranged on the body, and joists are fixed on the support. A spring and a damper are vertically arranged in the center of the support base, and a universal joint that connects the spring end and the damper end to the upper end of the support base and the body is provided.

In the above structure, an air spring, a coil spring or the like is used as the spring.

〔Example〕

 Hereinafter, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention, which is a building frame 1
The support base 2 is arranged on the upper side, and the end portion of the joist 10 is placed and fixed on the support base 2. A plurality of support legs 11 are attached to the upper surface of the joist 10.
A floor panel 12 is installed above the floor panel 12 and constitutes a free access floor.

As shown in FIG. 3, the support base 2 is composed of a ring-shaped bottom plate 4, a plurality of support legs 7, and a support plate 8.
It is configured by being supported by a supporting leg 7 attached to the.

Since the fluororesin 3 is attached to the upper surface of the body 1 and the bottom plate 4 having the lower surface treated with fluororesin is placed on the upper surface of the fluororesin 3, the support base 2 can be moved horizontally with respect to the body 1. Is.

In addition, as shown in FIG. 2, the steel plate 13 etc. are installed on the body,
A ball bearing 14 may be provided on the lower surface of the bottom plate 4 and placed on the steel plate 13.

A coil spring 5 is arranged in the center of the support base 2, and a damper 6 is arranged in the coil spring 5. A universal joint 9 such as a ball joint is provided in the center of the supporting plate 8 and the body 1 immediately below the supporting plate 8, and the universal joint 9 has a coil spring 5
The ends and the ends of the damper 6 are connected.

Therefore, the support base 2 is normally located at a fixed position as shown in FIG. 4, but when a horizontal force acts on the building during an earthquake or the like, it horizontally moves together with the joists 10 as shown in FIG. Then, the horizontal displacement is suppressed by the action of the spring 5 and the restoring force acts on the support base 2, and the damping force is generated by the action of the damper 6 and the friction force between the skeleton 1 or the fluororesin 3 or the steel plate 13 and the bottom plate 4 generated by the restoring force. Works. Therefore, the horizontal vibration of the support base 2 quickly converges, and the support base 2 returns to its original position.

〔The invention's effect〕

The spring that provides the restoring function and the damper of the seismic isolation device will be incorporated into one unit, and the overall size of the device will be small and the structure will be simple. Further, since the spring and the damper are provided in the support base, a dead space is not taken up, and the installation can be done by one kind of device, and the workability is good.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a seismic isolation device of the present invention, FIG. 2 is a sectional view showing an attachment relationship between a bottom plate and a skeleton, and FIG. 3 is a perspective view of a support base, FIGS. The figure is a cross-sectional view showing an operating state of the seismic isolation device. DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Support stand, 3 ... Fluoro resin, 4 ... Bottom plate, 5
… Coil springs, 6… Dampers, 7… Support legs, 8… Support plates, 9… Universal joints, 10… Joists, 11
... Support legs, 12 ... Floor panel, 13 ... Steel plate, 14 ... Ball bear rug.

Continuation of front page (72) Inventor, Inomata Ryo, Akasaka 1-2-7, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A-52-49137 (JP, A) 44334 (JP, U)

Claims (1)

[Claims] 1. A support base is slidably arranged on a body, and joists are fixed on the support base. A spring and a damper are vertically arranged in the center of the support base for support. A floor seismic isolation device characterized in that a universal joint for connecting the spring end and the damper end is provided on the upper end of the base and the body.