JPH08326840A - Base isolation structure - Google Patents

Abstract

PURPOSE: To provide a base isolation structure which is effective against earthquake, or traffic vibration, which is not affected by usual oscillation like a wind, and which is excellent in durability. CONSTITUTION: A base isolation structure is composed of a composite stack in which a plurality of hard boards 1 and a plurality of soft boards 2 having a viscoelastic property are alternately stacked one upon another between upper and lower surface panels 3, a plastic member 5 which extends through the composite stack, and a protecting layer 6 formed on the outer surface of the plastic member 5.

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, and more particularly to a seismic isolation structure used for a seismic isolation device that is preferably used for a light load such as a detached house that is easily affected by wind sway or the like. Is.

[0002]

2. Description of the Related Art Conventionally, seismic isolation structures in which a plurality of rigid hard plates such as steel plates and soft plates such as rubber having viscoelastic properties are alternately laminated are used for middle and low-rise buildings. It is widely used as a rubber support piece for seismic isolation devices such as bridges and bridges. The elastic body such as rubber that constitutes the soft plate of the seismic isolation structure is generally designed to have the following spring characteristics. That is, the lateral spring constant KH of an elastic body such as rubber
, And the mounted mass is M, the horizontal natural frequency fH is designed to satisfy the following conditions. fH = (1 / 2π) √ (KH / M) = 0.5 (Hz) This natural frequency fH is determined by the ratio of the weight of a building or bridge to the lateral spring constant KH of an elastic body such as rubber. Therefore, as the elastic body that constitutes the soft plate of the seismic isolation device having a large loading weight M such as a building or a bridge, a material having a large spring rigidity or a highly elastic material is generally used. Such a seismic isolation device is effective against earthquakes and traffic vibrations, but has a problem in that it is affected by wind sway. Therefore,
It has been proposed that a columnar plastic material such as lead, tin, or nylon is enclosed in a seismic isolation structure to increase only the initial rigidity and prevent wind sway without impeding seismic isolation performance.

[0003]

However, such a seismic isolation structure has good initial characteristics, but when it is repeatedly subjected to shear deformation during long-term use, the plastic material enclosed by the edge of the hard plate is used. However, there was a problem that it was easily damaged and eventually ruptured early.

The present invention has been made in view of the above-mentioned conventional techniques, and is not only intended for seismic isolation devices having a large weight such as buildings and bridges, but especially for detached houses. Even if it is applied to light-weight objects such as the above, it provides a seismic isolation structure that is not easily affected by wind sway and has excellent durability.

[0005]

According to the present invention, in a seismic isolation structure, a plurality of hard plates having rigidity and a plurality of soft plates having viscoelastic properties are alternately provided between upper and lower face plates. By providing a protective layer on the outer side of the columnar plastic material that is sealed so as to penetrate through the inside of the laminated composite laminated body, the above problems have been solved.

Examples of materials used for the soft plate of the seismic isolation structure of the present invention include organic materials such as thermoplastic rubber, urethane rubber, various vulcanized rubbers, unvulcanized rubbers, slightly crosslinked rubbers, and plastics. Various materials such as foamed materials, inorganic materials such as asphalt and clay, and mixed materials thereof can be used. These materials may be used alone, or two or more kinds may be used in combination, such as a high damping material for the inner part and a material having good creep performance and soft material for the outer part. Further, as the hard plate in the present invention, metal, ceramics, plastics, FRP, polyurethane,
Various materials having required rigidity such as wood, paper board, slate board, and decorative board can be used.

In order to impart weather resistance to the seismic isolation structure used in the seismic isolation device of the present invention, the outside of the seismic isolation structure may be covered with a material having excellent weather resistance. As the clothing material, for example, butyl rubber, acrylic rubber, polyurethane, silicone rubber, fluorine rubber, polysulfide rubber, ethylene propylene rubber (ERP and EPDM), hypalon, chlorinated polyethylene, ethylene vinyl acetate rubber, chloroprene rubber, etc. Can be used. These materials may be used alone or in a blend of two or more. Further, it may be blended with natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber and the like.

The columnar plastic material used in the present invention is preferably a plastically deformable metal such as lead or tin, or a high molecular weight compound such as 6-nylon. The protective layer used in the present invention is preferably a hard metal having a thickness of 100 μm to 200 μm, such as a stainless plate. Further, this metal sheet may be used by being wrapped around a columnar plastic material. As the winding method, a method of winding in a spiral shape,
There is a method of winding in a cylindrical shape. Further, as the protective layer used in the present invention, rubber having a high hardness of JISA 70 ° or more is also preferably used. As the high hardness rubber used for this protective layer, vulcanized rubber, urethane rubber, thermoplastic elastomer and the like are preferably used.

The seismic isolation structure of the present invention has a surface pressure of 50 Kgf.
It is preferably used as a light load seismic isolation structure having a surface pressure of less than / cm ² , and a surface pressure of 30 Kgf / cm ² or less, and more preferably a surface pressure of 20 Kgf / cm ² or less. As described above, by providing the protective layer on the outside of the columnar plastic material enclosed in the seismic isolation structure, it is possible to prevent the columnar plastic article from breaking and prevent the influence of wind sway over a long period of time. became.

[0010]

In the seismic isolation structure of the present invention, the inside of a composite laminated body in which a plurality of rigid hard plates and soft plates having viscoelastic properties are alternately laminated between upper and lower face plates, respectively. By providing a protective layer on the outside of the columnar plastic that penetrates
The columnar plastic is protected and is not damaged by the edges of the hard plate.

[0011]

[Embodiment 1] Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 shows a sectional view of a seismic isolation structure according to an embodiment of the present invention. In the seismic isolation structure shown in FIG. 1, 18 pieces of doughnut-shaped steel plates having an outer diameter of 250 mm, an inner diameter of 24 mm, and a thickness of 1.6 mm are used as the hard plate 1 between the upper and lower face plates 3 (iron plates) by adhesive treatment, The soft plate 2 has a 50% modulus of 2.5 Kgf / cm ^{2 and a} tensile strength of 97.
Kgf / cm ² , using a rubber material with an elongation at break of 760%,
Outer diameter 260 mm, upper inner diameter 21 mm, lower inner diameter 24
mm and thickness 5.0 mm were used. As the columnar plastic material 5 penetrating to the upper and lower face plates, the upper diameter is 20.8 m.
m, and a columnar lead with a slope having a diameter of 23.8 mm at the bottom was used. A protective layer 6 having a thickness of 1 is formed on the outside of the columnar lead.
A stainless sheet having a width of 00 μm and a width of 2 cm was spirally wound and used so that 1 cm, which is a half of the width of the stainless sheet, overlaps. As a result, not only the wind sway preventing effect can be obtained, but also the columnar lead plastic material 5 to be enclosed can be protected from the edge of the hard plate 1 by the protective layer 6 of the stainless sheet.

[0012]

[Embodiment 2] FIG. 2 shows a sectional view of a seismic isolation structure according to another embodiment of the present invention. In the seismic isolation structure shown in FIG. 2, the outer diameter 2 is set as the hard plate 1 between the upper and lower face plates 3 (iron plates).
18 pieces of donut-shaped steel plates having an inner diameter of 50 mm, a diameter of 28 mm, and a thickness of 1.6 mm are treated with an adhesive and used as the soft plate 2.
% Modulus is 2.5 Kgf / cm ² Tensile strength is 95 Kgf / cm
² , using a rubber material with an elongation at break of 760% and an outer diameter of 2
The one having a diameter of 60 mm, an inner diameter of 28 mm and a thickness of 5.0 mm was used. As the columnar plastic material 5 penetrating to the upper and lower face plates, columnar lead having a diameter of 23.6 mm was used. As the protective layer 6 on the outer side of the columnar lead, hardness JISA 80 °, thickness 2 m
m high hardness rubber material was used. As a result, not only the effect of preventing wind swaying is obtained, but also the columnar lead plastic material 5 to be enclosed can be protected from the edge of the hard plate 1 by the protective layer 6 of high hardness rubber.

[0013]

As is apparent from the above description, a plurality of hard plates having rigidity and a plurality of soft plates having viscoelastic properties are alternately laminated between the upper and lower face plates of the seismic isolation structure. By providing a protective layer on the outside of the column-shaped plastic material that penetrates inside the composite laminated body and the laminated body in which a plurality of friction plates are laminated, it is possible to affect wind shakes other than during an earthquake for a long period of time. We were able to obtain a seismic isolation structure that is hard to receive.

[0014]

[Brief description of drawings]

FIG. 1 is a sectional view of a seismic isolation structure according to an embodiment of the present invention.

FIG. 2 is a sectional view of a seismic isolation structure according to another embodiment of the present invention.

[Explanation of symbols]

 1: Hard plate 2: Soft plate 3: Face plate 4: Outer rubber 5: Columnar plastic material 6: Protective layer

Claims (5)

[Claims] 1. A composite laminate, in which a plurality of rigid hard plates and a plurality of soft plates having viscoelastic properties are alternately laminated between upper and lower face plates, and the inside of the composite laminate is provided. In a seismic isolation structure in which a columnar plastic material penetrating the composite laminate is enclosed, a seismic isolation structure is provided with a protective layer outside the plastic material. 2. The protective layer has a thickness of 100 μm to 200 μm.
The seismic isolation structure according to claim 1, wherein the seismic isolation structure is a hard metal of μm. 3. The protective layer has a thickness of 100 μm to 200 μm.
The seismic isolation structure according to claim 2, wherein a hard metal sheet of μm is spirally wound around the plastic material. 4. The seismic isolation structure according to claim 2, wherein the protective layer is a cylindrical hard metal. 5. The hardness of the protective layer is JIS A 70 °.
The seismic isolation structure according to claim 1, wherein the seismic isolation structure is one of the above high hardness rubbers.