JP4045886B2 - Deformation limiting device for seismic isolation bearing device and building support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure in which a building such as a detached house is supported by a seismic isolation bearing device, and a deformation amount limiting device for the seismic isolation bearing device.
[0002]
[Prior art]
Conventionally, in order to protect buildings from earthquakes, an exemption is made of laminated rubber in which a plurality of rigid plates such as steel plates and soft plates such as rubber having viscoelastic properties are alternately laminated. A seismic structure is inserted between the building and the foundation. By supporting the building with the laminated rubber used here, the natural frequency of the building is lengthened, preventing resonance with the seismic wave and making the vibration large but slow, and the vibration is damper (damping) In general, seismic isolation systems using a method of converging in a short time by installing a device) are used.
[0003]
A system using a combination of laminated rubber (or a spring mechanism instead) and a damper is also adopted for seismic isolation systems for detached houses, but when the load (support load) supported by the device per unit is a building. Compared to this, the spring stiffness of laminated rubber is very small, and the amount of horizontal displacement of the building during an earthquake increases.
[0004]
In consideration of such circumstances, in order to limit the amount of building displacement in the seismic isolation system for detached houses, a rope-like body is stretched between the building and the ground side to limit the amount of building displacement. The structure is described in Japanese Patent Application Laid-Open No. 2000-230342.
[0005]
[Problems to be solved by the invention]
If the rope-like body is simply stretched between the building and the ground, the building is inferior in the repositioning characteristic of returning to the original position.
[0006]
An object of the present invention is to provide a deformation amount limiting device for a seismic isolation bearing device excellent in the repositioning characteristics of a building, and a building support structure using the deformation amount limiting device for the seismic isolation bearing device.
[0007]
[Means for Solving the Problems]
The deformation amount limiting device of the seismic isolation bearing device according to the present invention includes a high-strength linear body having one end connected to the ground side, the other end connected to the building side, and at least one part of the whole or the middle being bent. And an elastic body covering at least a bent portion of the high-strength linear body, and a deformation amount limiting device for the seismic isolation bearing device , wherein the high-strength linear body is a chain or a wire rope It is characterized by this.
[0008]
Further, the building support structure of the present invention is such that the amount of movement of the building in the horizontal direction is limited by the deformation amount limiting device of the present invention.
[0009]
In the deformation amount limiting device and the building support structure of the present invention, when the building moves in the horizontal direction due to the ground or the like, the deformation amount of the seismic isolation support device and the building are formed by the high-strength linear body stretching straight. The amount of movement is limited. In the present invention, since the high-strength linear body is covered with the elastic body, the high-strength linear body extending in a linear shape or a shape close thereto is restored from the elastic body to the original shape. Power is given, and relocation power is given to the building.
[0011]
The present invention is particularly suitable for application to a detached house.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. 1 (a) is a side view of the deformation amount limiting device according to the embodiment, FIG. 1 (b) is a cross-sectional view taken along line BB of FIG. 1 (a), and FIG. 2 is the seismic isolation bearing device. FIG. 3 and FIG. 4 are sectional views of the deformation amount limiting device of the seismic isolation bearing device according to another embodiment.
[0013]
As shown in FIG. 2, the deformation amount limiting device 10 is installed so as to connect the foundation 1 and the base 2 of the building. The deformation amount limiting device 10 includes a chain 11 as a high-strength linear body having one end connected to the base 2 and the other end connected to the foundation 1, and a rubber 12 as an elastic body covering the chain 11. Prepare. In this embodiment, the deformation amount limiting device 10 has a U shape, and the chain 11 also extends in a U shape. The rubber 12 covers the portions other than both ends of the chain 11. The rubber 12 has an external shape in which a cylinder is curved in a U shape. Both ends of the chain 11 protrude from both end surfaces of the rubber 12. The portion where the chain 11 protrudes from both end faces of the rubber 12 is a substantially semi-elliptical loop.
[0014]
The deformation amount limiting device 10 is connected to the foundation 1 and the base 2 via an eyebolt 20 and a connecting fitting 21 such as a jackle. The eyebolt 20 on the foundation 1 side is disposed vertically below the eyebolt 20 on the base 2 side. The base 2 is supported on the foundation 1 by a seismic isolation device (not shown). As this seismic isolation bearing device, one in which steel plates and rubber are alternately laminated is suitable.
[0015]
As shown in FIG. 2, the deformation amount limiting device 10 remains in a U-shaped original shape during normal times (when the building is not displaced during a non-earthquake).
[0016]
When the building is displaced in the horizontal direction due to an earthquake or the like, the deformation amount limiting device 10 is pulled through the eyebolt 20, and the deformation amount limiting device 10 is displaced into, for example, a “tsu” shape or a “<” shape. When the amount of displacement reaches the allowable upper limit amount, the chain 11 becomes substantially straight and prevents further displacement of the building. That is, the displacement amount of the building is limited to the maximum displacement amount that the chain 1 is tight, and the deformation amount of the seismic isolation bearing device is also limited to the specified amount or less.
[0017]
The rubber 12 gives a force to return the deformed deformation limiting device 10 to the original shape, and applies a force to the base 2 to return the building to the original position. This makes it easier for the building to return to its original position after the earthquake.
[0018]
The rubber 12 has a hardness (JIS A) of 30 ° to 90 °, a 100% modulus of 0.6 to 3.0 N / mm ² , and a shear elastic modulus in order to ensure sufficient force in the direction of reposition applied to the building. It is preferable that it is 0.3-1.7N / mm < ² >.
[0019]
In the above embodiment, the deformation amount limiting device 10 is U-shaped, but as shown in FIGS. 3 and 4, an S-shaped deformation amount limiting device 10A or a substantially W-shaped deformation amount limiting device 10B. Etc. can also be used. Although not shown, a deformation amount limiting device having a shape meandering more than W-shaped may be used.
[0020]
The deformation amount limiting device is disposed, for example, in the vicinity of the four corners of a building, and the position and number of the deformation are appropriately increased or decreased according to the size and shape of the building.
[0021]
The above embodiment is an example of the present invention, and the present invention may take forms other than those shown in the drawings. For example, it may be used wire rope in place of the chain. In addition, it is preferable that high-strength linear bodies, such as this chain, have the intensity | strength which can bear the tensile force of about 4-20 tons. The present invention can also be applied to buildings other than detached houses. In FIG. 2, one end of the deformation amount limiting device 10 is connected to the foundation 1 via an eyebolt 20, but a ground-side fixed structure other than the foundation (for example, a columnar shape made of concrete, steel or the like driven into the ground) To the object).
[0022]
Since the deformation amount limiting devices 10, 10 </ b> A, and 10 </ b> B all cover the entire chain 11 with the rubber 12, the restoring force applied from the rubber 12 is large. However, the rubber 12 may be provided so as to cover a smaller range than the illustration of the chain 11.
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to reliably limit the amount of horizontal deformation and the amount of displacement of a building within a predetermined range during an earthquake or the like. In addition, according to the present invention, it is possible to apply a restoring force to return the displaced building to its original position, thereby promoting the restoration of the building.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a deformation amount limiting device according to an embodiment.
FIG. 2 is a structural diagram under the floor of a building to which a deformation amount limiting device for a seismic isolation bearing device is attached.
FIG. 3 is a cross-sectional view of a deformation amount limiting device of a seismic isolation bearing device according to another embodiment.
FIG. 4 is a cross-sectional view of a deformation amount limiting device of a seismic isolation bearing device according to still another embodiment.
[Explanation of symbols]
1 Foundation 2 Base 10, 10A, 10B Deformation Limiting Device 11 Chain 12 Rubber 20 Eye Bolt 21 Connecting Bracket

Claims (6)

One end is connected to the ground side, the other end is connected to the building side, and a high-strength linear body in which at least one place in the whole or the middle is bent,
An elastic body covering at least a bent portion of the high-strength linear body;
A deformation amount limiting device for a seismic isolation bearing device comprising :
The high-strength linear body is a chain or a wire rope.   The deformation amount limiting device for a seismic isolation bearing device according to claim 1, wherein the elastic body is rubber. 3. The rubber according to claim 2, wherein the rubber has a hardness (JIS A) of 30 ° to 90 °, a 100% modulus of 0.6 to 3.0 N / mm ² , and a shear modulus of 0.3 to 1.7 N / mm ^2. Deformation limiting device for seismic isolation bearing device.   4. The deformation limiting device for a seismic isolation bearing device according to claim 1, wherein the high-strength linear body extends in a U shape, an S shape, or a W shape. In a building support structure where the building is supported by a seismic isolation device,
5. A building support structure, wherein the horizontal movement range of the building is limited by the deformation amount limiting device of the seismic isolation support device according to any one of claims 1 to 4 . 6. The building support structure according to claim 5, wherein the building is a detached house.

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