JPH1030359A - Base isolation device of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize the device, by installing the base isolation device in which an intermediate block having a curvature at the upper and lower faces is held toy arcuate motion guide rails, on a foundation to support a building, so as to displace and restore the device even in a small horizontal force. SOLUTION: An intermediate block E provided with protruded curved faces 1, 2 at the upper and lower sides is set to freely slide through arcuate motion guide rails 3 having the same curvature with the faces, between the upper block B and the lower block D to form a base isolation device. An anti- frictional material like ball bearings or fluororesin is used at the contact part of the guide rail 3 and the guide 5 to reduce frictional resistance. This base isolation device is installed on the foundation C to support columns A1 of the building. This device supports the weight G of building and absorbs even a relatively small horizontal force and further, divides the load G into the normal direction and the tangential direction to bring about a restoring force by the tangential force. In this way, the device can be miniaturized as a unit without use of laminate rubber materials, springs, dampers, etc.

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 for a building.

[0002]

2. Description of the Related Art A structure that reduces the response acceleration of a building during an earthquake by lengthening the period of the building is generally called a seismic isolation structure. In general, the seismic isolation structure has a support function, a restoring force function, and a damping function.The supporting function has a function of safely maintaining the building weight, and the restoring force function is used when the building is displaced in a long cycle. It is restored to the vertical axis, and the damping function is to quickly eliminate the vibration of the building.

Devices conventionally used as seismic isolation devices include a laminated rubber isolator as shown in FIG. 6A and a linear as shown in FIG. 6B which are interposed between a building A and a foundation B, respectively. There are devices that use guides and rails and coil springs. The former laminated rubber isolator p is formed by laminating several tens of thin rubber sheets and iron plates as shown in FIG. 6 (a), has a sufficient horizontal deformation performance, and is a main device for realizing a seismic isolation structure. is there. Figure p ₁ is an attenuator (damper)
It is.

[0004] The latter device is as shown in FIG. 6 (b), is composed of a linear guide and rail q ₁ and the coil spring q ₂ and attenuator (damper) q ₃ Prefecture, and is separately Restore the load supporting function It is configured to be exercised.

[0005]

In the above-mentioned laminated rubber isolator, the horizontal rigidity of the laminated rubber is determined by the cross-sectional area, and if the period becomes longer, the laminated rubber cannot be designed. At the time of large deformation, the laminated rubber may fall down. In addition, rubber is flammable and must be fire resistant, and is also difficult to apply to light weight private homes.

In the latter seismic isolation device using a linear guide and rail and a coil spring, the size of the device is increased and large displacement is caused. Therefore, the number of coil springs for imparting restorability is increased, and the mounting length is increased. It is difficult to design the coil spring, for example, it becomes longer. FIG. 7 shows the relationship between the building cycle due to the earthquake and the building response acceleration. The present invention has been proposed in view of the problems of the prior art described above, and the object thereof is to be able to deform in the horizontal direction while maintaining a high supporting ability, and to have a horizontal deformation performance due to a small horizontal force. An object of the present invention is to provide a seismic isolation device for a building that is large, has excellent resilience, and can easily set and adjust a natural period.

[0007]

In order to achieve the above-mentioned object, a seismic isolation device for a building according to the present invention has a curvature on each of upper and lower surfaces, and each of the upper and lower curvature surfaces has the same curvature as the same surface. An intermediate block to which the circular motion guide rail is fixed, and upper and lower blocks on which the circular motion guide guide paired with the respective guide rails are respectively disposed on the building side and the foundation side with the intermediate block interposed therebetween. It is composed of

The invention according to claim 2 is characterized in that the upper and lower blocks include:
An apparatus combining the intermediate block sandwiched between the two blocks is configured to be stacked in directions different from each other.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. It is installed under one column A 'of the building A, and the number of guides described below that can support the load supported by the column A' by the seismic isolation device is designed. In order to exert the seismic effect, the devices are stacked in two stages as described below.

Accordingly, the upper block B fixed below the column A 'of the building A, the lower block D fixed on the foundation C, and the intermediate block E having a curvature on the upper and lower surfaces are integrally formed. Installed below A '. In FIG. 2, the upper and lower blocks do not show the upper and lower blocks B and C. The upper and lower curved plates 1 and 2 in the intermediate block E have a curvature only in one direction, and the arcuate motion guide rail 3 is fixed in the direction having the curvature, and the guide rail 3 is anchored to the upper and lower blocks B and D. It is slidably inserted through a fixed guide 5 via a bolt 4 or the like. Accordingly, the intermediate block E having the upper and lower curved plates 1 and 2 can move in one direction through the circular motion guide rail 3 and the guide 5.

In FIG. 3, a ball bearing is provided in the guide 5 so as to allow the rail 3 to slide smoothly in the insertion hole of the rail 3 provided in the guide 5. Instead of the ball bearing 6, a lubricating material made of fluorine resin or the like may be used. Therefore, when the building attempts to deform horizontally during an earthquake, each of the blocks makes a horizontal displacement without causing a rotational motion, and only the curved plate sandwiched between the blocks undergoes a rotational displacement. This displacement is smoothly performed by the guide 5 and the rail 3, and the frictional resistance is small. When the guide rail 3 is displaced in this manner, the guide rail 3 has a curvature, so that the supporting load G is decomposed into a normal force G ₁ and a tangential force G ₂ , and the component force G ₂ acting in the tangential direction restores the original position. The resilience function that tries to return to the normal state occurs.

Further, since it is not necessary to add a restoring force mechanism such as a coil spring in addition to the present device, the device can be reduced in size and can be unitized. In the drawing, θ is the rotation angle of the intermediate block E. Since the above-mentioned device is deformed only in one direction, as shown in FIG. 5, two devices can be freely deformed in two directions by layering them in different directions. In the figure, F is an intermediate mounting block, and other parts equivalent to those in the above embodiment are denoted by the same reference numerals.

[0013]

As described above, the seismic isolation device for a building according to the present invention has a high cost because three block polymers having curvature on the upper and lower surfaces are disposed between the building side and the foundation side. It can be deformed in the horizontal direction while retaining the supporting capacity. At this time, the upper and lower blocks do not rotate, there is no horizontal and vertical deformation, and the intermediate block is on the building side and the foundation side. By having a curved surface and providing an arcuate motion guide rail with the same curvature as the same surface, horizontal deformation is performed smoothly, and horizontal deformation due to horizontal earthquake input with small frictional resistance It is possible to return to the original position when the horizontal force disappears by having a curvature surface, and it has excellent restoring performance, and the restoring force function becomes unnecessary,
The device can be reduced in size and unitized.

Further, since the setting of the natural period can be set only by the magnitude of the curvature deformation, the adjustment is easy. According to the invention of claim 2, the seismic isolation device constructed by combining the upper and lower blocks and the intermediate block sandwiched between the two blocks is laminated in two different directions. Since the device can be designed independently in two directions, manufacture is easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a building seismic isolation device according to the present invention.

FIG. 2 is a perspective view showing a main part of FIG. 1, in which upper and lower blocks are omitted.

FIG. 3 is an enlarged view of a part A of FIG.

FIG. 4 is a longitudinal sectional view showing a state of the seismic isolation device of the present invention at the time of horizontal deformation.

FIG. 5 is a longitudinal sectional view showing a state where the devices of the present invention are layered.

FIGS. 6A and 6B are longitudinal sectional views of a conventional seismic isolation device.

FIG. 7 is a conceptual diagram illustrating functions of a seismic isolation structure.

[Explanation of symbols]

A building A 'pillar B upper block C basal D lower block E midblock F intermediate mounting block 1 curved plate 2 curved plate 3 arc motion guide rail 4 anchor bolt 5 guide 6 ball bearing p laminated rubber isolator p ₁ damper q ₁ linear guide and rail q ₂ coil spring q ₃ attenuator

Claims (2)

[Claims] 1. An intermediate block having upper and lower surfaces each having a curvature, and an upper and lower curvature surface on which an arcuate motion guide rail having the same curvature as the same surface is fixed, and a building side and a foundation side respectively sandwiching the intermediate block. A seismic isolation device for a building, comprising: upper and lower blocks on which are mounted an arcuate motion guide guide paired with each of the guide rails. 2. The seismic isolation device for a building according to claim 1, wherein a device combining the upper and lower blocks and the intermediate block sandwiched between the upper and lower blocks is layered in directions different from each other.