JPH0450366Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a seismic isolation support device for buildings.

[Conventional technology and issues]

For the purpose of seismic isolation of buildings, some seismic isolation construction methods have been adopted in which buildings are supported with supports such as rubber blocks or laminated rubber.

However, since conventional rubber bearings simply have end plates arranged on the upper and lower end surfaces of a rubber block or laminated rubber, the rubber creeps over time under a vertical load, causing shrinkage and deformation. This tendency is particularly noticeable when a viscoelastic rubber with a large loss coefficient is used, so it is not possible to use a viscoelastic rubber to enhance the energy absorption effect (vibration damping effect).

This idea was devised in view of the problems of the prior art mentioned above, and it is a building that does not cause vertical displacement even after long-term use, has a high energy absorption effect (vibration damping effect), and has a simple structure and is easy to manufacture. The purpose is to provide a seismic isolation bearing device.

[Means to solve the problem]

The seismic isolation support device for buildings of this invention has a rubber block and end plates bonded to the upper and lower end surfaces of the rubber block, and a hole is bored in the vertical direction of the rubber block so that the end plate can be tilted in contact with the upper and lower end plates. A metal core is inserted into the hole.

The metal core is connected through the upper and lower end plates.
It bears most of the vertical load of the building,
For horizontal loads, the shear deformation of the rubber block is followed by tilting. In addition, the function of the rubber block in this invention is to provide horizontal flexible spring characteristics in the seismic isolation device, and the metal core in contact with the end plate bears most of the vertical load of the building, and the rubber block substantially No creep deformation occurs because there is no need to provide a vertical load support function.

In the above configuration, it is desirable that the upper and lower ends of the metal core be formed in a hemispherical shape.

〔Example〕

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

Figure 1 shows the seismic isolation support system 1 for buildings based on this invention.
FIG. 2 is a sectional view taken along the line --, and FIG. 3 is a sectional view taken along the line -- of FIG. 2.

The seismic isolation support device 1 of this invention has end plates 3 and 4 glued to the upper and lower end surfaces of a rubber block 2, with the upper end plate 3 being attached to the building side foundation (upper foundation), and the lower end plate 4 being attached to the building side foundation (upper foundation). Each is fixed to the lower foundation with bolts, etc. In the illustrated embodiment, bolt holes 5 are bored at the four corners of the end plates 3, 4.

There are four holes 6 at 90° around the rubber block 2.
Holes are drilled vertically at intervals. Metal cores 7 that are in contact with the upper and lower end plates 3 and 4 are fitted into these holes 6. The upper and lower ends of the core 7 are formed into a spherical shape centered on the center height thereof. Therefore, when the rubber block 2 of the seismic isolation bearing device 1 undergoes shear deformation, the core 7 follows this in a tilting manner. Therefore, even when the seismic isolation bearing device 1 undergoes shear deformation, the rubber block 2 remains in the core 7.
The core 7 does not affect the shear deformation of the seismic isolation bearing device 1. Therefore, the shear rigidity of the seismic isolation bearing device 1 is determined only by the rubber block portion, and even if the core 7 is attached, the low shear rigidity (horizontal rigidity), which is a necessary condition for the seismic isolation bearing device, can be maintained.

Furthermore, if the radius r of the hemispherical portions at the upper and lower ends of the core 7 is centered on the center height of the core 7, as shown in Fig. 4, the rubber block of the seismic isolation support device will be sheared and deformed during an earthquake. However, no vertical deformation occurs in the seismic isolation bearing, and the height does not change.

Furthermore, if the radius r of the hemispherical portion of the core 7 is made slightly larger (that is, the curvature is slightly smaller) than the radius shown in FIG. 4, as shown in FIG. Vertical deformation occurs in the seismic bearing device, and the height increases slightly.
Therefore, in the case shown in Figure 5, after the disturbance during an earthquake has subsided, the vertical load of the building (that is, the weight of the building) applied to the seismic isolation bearing device gives resilience to the seismic isolation bearing device, and the seismic isolation bearing device Helps return to original shape.

Note that although four cores 7 are used in the illustrated embodiment, the number may be greater or less than that. For example, only one can be used in the center. Further, although the rubber block 2 is formed in a cylindrical shape, it may be formed in a prismatic shape.

``Effects of the invention'' Since the vertical load of the building is borne by the metal core, vertical creep deformation does not occur in the seismic isolation bearing device, regardless of the creep characteristics of rubber.Therefore,
Viscoelastic rubber with a high creep rate can be used, and the vibration damping effect can be enhanced.

Manufacturing is extremely simple, as all that is required is to drill a hole in the rubber block and insert the metal core. Furthermore, since the metal core is arranged to be tiltable, the shear rigidity of the seismic isolation bearing device is determined only by the rubber block portion, and the basic design is no different from the conventional one.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the seismic isolation support device for a building according to this invention, Fig. 2 is a sectional view taken along the - line, Fig. 3 is a sectional view taken along the - line of Fig. 2, and Fig. 4 is a sectional view taken along the - line of Fig. 2.
FIG. 5 is a front view of the metal core. 1... Seismic isolation device, 2... Rubber block, 3, 4
...End plate, 5...Bolt hole, 6...
Hole, 7...core.

Claims (1)

[Scope of utility model registration request] It has a rubber block and end plates bonded to the upper and lower end surfaces of the rubber block, and the rubber block has a vertical hole bored therein, and the vertical load of the building is applied to the hole in contact with the upper and lower end plates. What is claimed is: 1. A seismic isolation support device for a building, characterized in that a metal core is inserted therein to support the shear deformation of the rubber block by tilting in response to a horizontal load.