JPH0979321A - Conical stacked rubber isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To isolate an upper structure from seismic motion transmitted from the ground even though a vertical load exerted to an isolator is small by forming a conical rubber stack, and by attaching the rubber stack at its lower end with a foundation fixing base plate and at its upper end with an upper structure attaching flange. SOLUTION: A conical rubber stack 1 is attached at its upper end with an upper structure attaching flange 3, and at its lower end with a foundation fixing base plate 2. With this arrangement, an upper structure can be isolated from seismic motion transmitted from the ground even though a vertical load exerted to an isolator is small, and further, since the rubber stack is conical, the area of the upper part can be smaller. Even though the upper structure is lightweight, the surface pressure exerted to the rubber stack 1 can be high, thereby it is possible to stabilize the vertical load resistant capability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device which is mounted between a structure such as a building and the ground to make it difficult for seismic motion of the ground to be transmitted to an upper structure.

[0002]

2. Description of the Related Art Conventional cylindrical laminated rubber isolators have been unsuitable for light-weight structures because the upper structure acts on something having a certain weight (surface pressure applied to the isolator). Considering the allowable horizontal deformation amount and allowable vertical load, etc., the diameter of the cylindrical laminated rubber is determined and the load for horizontally deforming it is required.

[0003]

[Problems to be solved by the invention]

B) A device that provides seismic isolation even if the vertical load on the laminated rubber isolator is small. B) A lightweight and downsized device for the laminated rubber isolator.

[0004]

[Means for Solving the Problems] The structure is: a) The laminated rubber (1) is formed into a conical shape. ) Mounting the above device between the foundation and the upper structure A device configured as described above.

[0005]

The function of this device is to isolate the ground motion from the ground motion against the upper structure. Since the laminated rubber has a conical shape, the area of the upper portion can be reduced, and the surface pressure applied to the laminated rubber can be increased even if the upper structure is lightweight. Since the lower part is wide, even if the laminated rubber is deformed horizontally, the laminated rubber overlaps the upper and lower sides, so that a large allowable horizontal deformation amount can be secured and the vertical load resistance is stable. Since the horizontal rigidity of the upper part is small and the horizontal rigidity of the lower part is large, the upper part acts on small vibrations, and the lower part acts on larger vibrations.

[0006]

EXAMPLES In carrying out the present invention, the following is possible. B) Isolator material is elastic b) Laminated rubber shape is polygonal pyramid c) Laminated rubber shape has a smaller upper surface area d) Laminated rubber shape is cylindrical Even if there is, the rigidity, damping factor, and area of the rubber of each layer are smaller on the upper side.

[0007]

EFFECT OF THE INVENTION An isolator having a stable seismic isolation effect from a lightweight structure to a heavy structure.

[Brief description of drawings]

1 is a perspective view

FIG. 2 is a plan view

FIG. 3 is a side view

[Explanation of symbols]

 1 Laminated rubber 2 Base plate 3 Flange

Claims (1)

[Claims] 1. An isolator in which a laminated rubber has a conical shape.