JP3941251B2 - Seismic isolation devices and seismic isolation structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device interposed between an upper structure and a lower structure in various seismic isolation structures and a seismic isolation structure using the same .
[0002]
[Prior art]
In recent years, in various structures, by installing seismic isolation devices at the foundation and middle layers of the structure, the vibrations that are about to propagate from the ground to the structure due to earthquakes, etc. are attenuated, Various seismic isolation structures have been developed that reduce stress and deformation in the frame.
Conventionally, as a seismic isolation device used for such a seismic isolation structure, there are roughly classified a laminated rubber bearing system and a sliding bearing system or a rolling bearing system.
[0003]
Here, seismic isolation devices using laminated rubber bearings are bearing members that have a large load-bearing ability and horizontal displacement ability by generally laminating thin steel sheets and rubber sheets alternately in multiple layers. The relative displacement in the direction is absorbed by highly elastic rubber, and the natural period of the structure is lengthened to reduce the seismic force.
[0004]
On the other hand, the above-mentioned slip-supporting seismic isolation device is fixed to the lower surface of the upper structure and the lower surface of the upper structure, and is slidably provided on the above-mentioned slip board. Friction force generated when the sliding material slides on the sliding plate when the lower structure is horizontally displaced during an earthquake, and the sliding material is made of a material such as Teflon. This damps the horizontal seismic force that acts on the superstructure and ensures the soundness of the superstructure.
[0005]
[Problems to be solved by the invention]
By the way, usually, when a structure is to be seismically isolated by such a seismic isolation device, a construction method using a combination of the above-described multiple types of seismic isolation devices is employed. In particular, when a seismic isolation device using a laminated rubber bearing and a seismic isolation device using a sliding bearing are combined, an appropriate friction coefficient and restoring force can be obtained, and the natural period can be increased. It is known that an effective seismic isolation structure can be realized.
[0006]
However, when the seismic isolation device for laminated rubber bearings and the seismic isolation device for sliding bearings are combined in this way, the number of seismic isolation devices to be interposed between the upper and lower structures increases. There was a problem that it was complicated and led to cost increase.
Moreover, since it has the same seismic isolation performance in any direction in the horizontal direction, it can be easily handled even if there is a request to provide seismic isolation performance that is biased to one side in the XY direction depending on the structure. There was also the problem of not being able to do it.
[0007]
In particular, in the case of a seismic isolation device using a sliding bearing, since the sliding member fixed to the upper structure slides on a flat sliding plate fixed to the lower structure, In order to ensure the amount of displacement assumed at the time of an earthquake in both XY directions in the inside, it is necessary to use a square or circular shape. As a result, the sliding plate becomes larger and correspondingly There is a problem that the mounting portion of the sliding plate in the substructure such as the foundation must be set to a large size.
[0008]
For this reason, particularly in a structure using a fabric foundation such as a house, it becomes difficult to attach a slip plate made of a large square plate or a circular plate as described above to the upper surface of the fabric foundation. The structure itself will be forced to undergo structural changes such as forming a separate mounting part with a large area only on the part where the sliding plate is attached, or using it as an independent foundation, resulting in a significant cost increase for the structure itself There was a point.
[0009]
The present invention was made in order to effectively solve the problems of the conventional seismic isolation device using a sliding bearing, and has the advantage of combining a laminated rubber bearing and a sliding bearing, and changes the seismic isolation performance in the horizontal direction. An object of the present invention is to provide a seismic isolation device and a seismic isolation structure using the seismic isolation device that can be easily installed in a narrow portion such as a structure based on a cloth foundation. It is what.
[0010]
[Means for Solving the Problems]
The seismic isolation device according to the first aspect of the present invention includes a strip-like slip plate fixed to one of the upper and lower structures, and a laminated rubber support member fixed to the other of the upper and lower structures. The laminated rubber bearing member is provided with a sliding material on the tip surface thereof, and is slidably disposed in the longitudinal direction along the surface of the sliding plate , and is laminated by the laminated rubber bearing member in one direction. In addition to exhibiting the functions of the rubber bearing and the sliding bearing by the sliding material and the sliding plate, only the function of the laminated rubber bearing is exhibited in the direction intersecting the one direction .
[0011]
Further, the seismic isolation structure according to the present invention described in claim 2 functions as a laminated rubber bearing and a sliding bearing in one direction, and in the direction intersecting with the one direction, the laminated rubber bearing. The seismic isolation devices that exhibit only the above function are installed at a plurality of locations between the upper and lower structure while changing the above-mentioned one direction .
[0012]
In the seismic isolation device according to claim 1, when the superstructure is relatively displaced in the longitudinal direction of the sliding plate when an earthquake occurs, the laminated rubber support member slides along the sliding plate. On the other hand, when the upper structure is relatively displaced in the direction intersecting with the longitudinal direction of the sliding plate, it is absorbed by the elastic force of the laminated rubber support member.
[0013]
Therefore, the seismic isolation device installed at one place exhibits a function of a sliding bearing and a laminated rubber bearing according to the direction of relative displacement of the upper and lower structures , By installing the above-mentioned seismic isolation devices in multiple locations by changing the direction in which the functions of the sliding bearing and the laminated rubber bearing are changed, the seismic isolation by the laminated rubber bearing and the sliding bearing is achieved by one type of seismic isolation device. An effect can be obtained.
[0014]
And it becomes possible to construct | assemble easily the base isolation structure from which a base isolation performance changes with directions by adjusting the number of the longitudinal direction of a sliding board suitably.
Moreover, according to the said seismic isolation apparatus, since the sliding board is formed in the strip | belt-plate shape which accept | permits the movement of a laminated rubber support member only in one direction, the attachment part of the structure which fixes this is also made small. Is possible. As a result, it can be easily applied to a structure having a narrow attachment location such as a fabric foundation.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of the seismic isolation device according to the present invention, and FIG. 4 shows an arrangement example of the seismic isolation device in the seismic isolation structure.
1 to 3, this seismic isolation device includes a laminated rubber support member 2 fixed to a fabric foundation (lower structure) 1 and a building wall (upper structure) 3 extending in a direction perpendicular to the fabric foundation 1. It is generally composed of a sliding plate 4 fixed to the lower surface.
Here, the laminated rubber support 2 is slidably provided on the surface of the sliding plate 4 by integrally attaching a sliding material 5 such as Teflon, a fluororesin (PTFE) material, or polyacetal on the upper surface thereof. It has been.
[0016]
On the other hand, the sliding plate 4 is a belt-like member, and its surface is made of stainless steel, chrome plating, or the like so that a desired frictional damping force can be obtained when the sliding member 5 slides. As shown in FIG. 2, a frame guide 4 a for guiding the sliding of the laminated rubber support member 2 along the longitudinal direction is integrally fixed to the peripheral portion of the sliding plate 4.
[0017]
FIG. 4 shows an arrangement example of the seismic isolation device in the seismic isolation structure 10.
In this seismic isolation structure 10, six sets out of a total of eight sets of seismic isolation devices are attached to the building wall 3 with the longitudinal direction of the sliding plate 4 facing up and down in the figure, Two sets of seismic isolation devices are attached with the longitudinal direction of the sliding plate 4 directed in the left-right direction in the figure.
[0018]
Next, the operation of the seismic isolation device having the above configuration will be described.
In the above building, when an earthquake occurs, first, when the upper structure is relatively displaced in the longitudinal direction of the sliding plate 4, the laminated rubber support member 2 slides between the frame guides 4a along the longitudinal direction of the sliding plate 4. To do. On the other hand, when the upper structure is relatively displaced in the direction intersecting with the longitudinal direction of the sliding plate 4, the laminated rubber support member does not slide but absorbs it by its elastic force.
[0019]
Therefore, for example, in the seismic isolation structure 10 shown in FIG. 4, when the upper structure is relatively displaced in the vertical direction in the figure at the time of an earthquake, six sets of seismic isolation devices relieve the seismic force by sliding support and 2 A pair of seismic isolation devices absorb this by means of laminated rubber bearings. As a result, the sliding bearing is dominant as the seismic isolation performance.
On the other hand, when the superstructure is relatively displaced in the horizontal direction in the figure, two sets of seismic isolation devices relieve the seismic force by sliding bearings, and six sets of seismic isolation devices Absorb. As a result, laminated rubber bearings are dominant for seismic isolation performance.
[0020]
As described above, according to the seismic isolation device having the above-described structure, the seismic isolation device installed at one place exhibits a plurality of the above-mentioned functions in order to exhibit the functions of the sliding bearing and the laminated rubber bearing depending on the relative displacement direction. By installing the seismic isolation devices at a plurality of locations by changing the longitudinal direction of the sliding plate, it is possible to obtain the seismic isolation effect by the laminated rubber bearing and the sliding bearing with one type of seismic isolation device. As shown in (1), the seismic isolation structure 10 whose seismic isolation performance varies depending on the direction of seismic force can be easily constructed by appropriately adjusting the number of sliding plates in the longitudinal direction.
[0021]
Moreover, according to the said seismic isolation apparatus, since the sliding board 4 is formed in the strip | belt plate shape which accept | permits the movement of the lamination | stacking rubber support member 2 only to one direction, the attachment part of the structure which fixes this is also small. It becomes possible to do. As a result, it can be easily applied to a structure having a narrow attachment location such as a fabric foundation.
[0022]
【The invention's effect】
As described above, in the invention described in claim 1 or 2 , the belt-like slide plate is fixed to one of the upper and lower structures, and the laminated rubber support member is fixed to the other of the upper and lower structures. Since the sliding material is provided on the tip surface of the laminated rubber bearing member and is slidable along the sliding plate, the laminated rubber bearing and the sliding bearing are arranged by arranging this seismic isolation device in an appropriate direction. And the seismic isolation performance in the horizontal direction can be changed, and can be easily installed in a narrow portion such as a structure based on a cloth foundation.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a seismic isolation device of the present invention.
FIG. 2 is a cross-sectional view in a direction orthogonal to the sliding plate of FIG.
3 is a perspective view showing a state in which the seismic isolation device of FIG. 1 is attached to a foundation portion of a building. FIG.
4 is a diagram showing an example of arrangement of the seismic isolation device of FIG. 1 in a seismic isolation structure.
[Explanation of symbols]
1 Fabric foundation (under structure)
2 Laminated rubber bearing member 3 Building wall (superstructure)
4 Sliding plate 5 Sliding material

Claims (2)

A belt-like sliding plate fixed to one of the upper and lower structures, and a laminated rubber support member fixed to the other of the upper and lower structures,
The laminated rubber bearing member is provided with a sliding material on the tip surface thereof, and is slidable in the longitudinal direction along the surface of the sliding plate . In one direction, the laminated rubber bearing member is provided with the laminated rubber bearing member. A seismic isolation device that exhibits the function of a sliding bearing using the sliding material and the sliding plate, and that exhibits only the function of the laminated rubber bearing in a direction intersecting the one direction . In one direction, the functions of the laminated rubber bearing and the sliding bearing are demonstrated. In addition, the seismic isolation structure is characterized by being installed by changing the above one direction.

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