JPS637636Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a floor structure that can provide seismic isolation against horizontal movement in all directions.

(Prior Art) As a conventional seismic isolation floor structure, one has been proposed in which a floating floor is supported by linear springs to protect computers from earthquakes.

(Problem that the invention aims to solve) However, if a particularly long-period linear spring is used as this linear spring, if the input level is very large, the displacement of the floating floor will become large, and this floor will become a building block. There was a collision with

The purpose of the present invention is to eliminate the drawbacks of linear springs and provide a seismic isolation floor structure with a large seismic isolation effect.

(Means for solving the problem) In the present invention, a nonlinear spring body 3 is held below a floating floor 2 on a building floor 1 by holding means 5, 6, and the nonlinear spring body is supported at the center. The body 4 penetrates in the thickness direction, and the thickness becomes thicker from the center toward the outside, and the support has a base that is slidably erected on the building floor, and an upper end that receives the floating floor. It is something that

(Function) Due to the nonlinear spring body 3, as the deformation increases, the rigidity gradually increases, and the force for suppressing the deformation and restoring the body gradually increases, thereby seismically isolating the precision equipment.

(Example) Examples of the present invention will be described below based on the drawings.

A floating floor 2 on which precision equipment (not shown) such as electronic computers is placed is provided above the building floor 1 in the computer room. The floating floor 2 is supported by a support body 4 paired with a nonlinear spring body 3.

The nonlinear spring body 3 has bowl-shaped recesses 3 on both upper and lower surfaces.
a and 3b are provided, and a center hole 3c is provided in the center. Therefore, the cross-sectional shape of the nonlinear spring body 3 is thin at the center and gradually becomes thicker toward the outer periphery, as shown in FIG. Nonlinear spring body 3
has cylinder bodies 5, 5 attached to its outer peripheral surface. Support columns 6, 6 erected from the building floor 1 are inserted into each of the cylinders 5, 5, and fixed with pins 7, 7 to hold the nonlinear spring body 3 on the support columns.
The support body 4 passes through the center hole 3c of the nonlinear spring body 3, and the base of this support body is located on the sliding plate 8,
The upper end receives a floating floor 2.

Therefore, during an earthquake, the support body 4 slides on the sliding plate 8 as the building floor 1 shakes in the horizontal direction;
This sliding movement is suppressed within a certain range by the elastic deformation of the nonlinear spring body 3, thereby exhibiting a vibration isolation effect. In a range where the relative displacement between the floating floor 2 and the building floor 1 is not very large, the natural period on the outer peripheral side of the nonlinear spring body 3 is long, so the seismic isolation effect for the floating floor is large. Furthermore, as the relative change between the floating floor 2 and the building floor 1 increases, the spring constant on the center side of the nonlinear spring body increases, causing the floating floor 2 to collide with the building wall 1a. can be avoided. When the shaking of the earthquake subsides, due to the restoring force of the nonlinear spring body 3,
The floating floor 2 automatically returns to its original position.

(Effects of the invention) As described above, according to the invention, since a nonlinear spring body is used, the natural period of the floating floor becomes longer.
The acceleration of the floating floor can be reduced, and collisions between the building floor and the floating floor can be avoided, and the seismic isolation effect is great. Also, since the nonlinear spring body has a structure in which the wall thickness increases from the center toward the outside,
Within the range of horizontal movement, it can be seismically isolated from shaking in all directions.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the installed state, and FIG. 2 is a perspective view of the main parts. DESCRIPTION OF SYMBOLS 1... Building floor, 2... Floating floor, 3... Nonlinear spring body, 4... Support body, 5, 6... Holding means.

Claims (1)

[Scope of utility model registration request] A non-linear spring body is held by a holding means below the floating floor on the building floor, and the non-linear spring body has a support passing through the center, and the thickness becomes thicker from the center toward the outside. A seismic isolation floor structure characterized in that the base is slidably erected on the building floor and the upper end receives the floating floor.