JP2006046474A - Complex damper and base isolating structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a complex damper having high impact or vibration energy absorbing capability while reducing ill effects on environment without using lead, and to provide a base isolating structure equipped therewith having sufficient base isolating performance and damping performance. <P>SOLUTION: The complex damper 15 comprises a complex of wire rods 16 selected from metal wires, organic fibers and inorganic fibers and a soft and flexible plastic 17 containing the wire rod 16. The wire rods are aligned with each other perpendicular to the direction of shearing deformation. The base isolating structure comprises a laminate having rigid hard plates 12 and rubber layers 13 alternately laminated and the damper 15 provided in a hollow portion 14 bored in the laminating direction of the laminate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite damper having an impact or vibration energy absorption capability, and a seismic isolation structure installed between a structure such as a road bridge, a viaduct, a building, and a house and a foundation thereof.

  Conventionally, in order not to directly propagate vibrations such as earthquakes to structures such as road bridges, seismic isolation structures have been adopted that dampen vibrations by interposing a base isolation structure between the structure and the base. Yes. As the seismic isolation structure used in this seismic isolation structure, for example, it is disposed in a laminate in which rigid hard plates and rubber layers are alternately laminated, and in a hollow portion drilled in the lamination direction of the laminate, The thing provided with the damper for improving the damping effect of a seismic isolation structure is mentioned.

  In general, lead is used as the material of the damper. Lead is excellent as a damper material for seismic isolation structures for civil engineering structures that are difficult to perform maintenance in that they are soft, rich in ductility, have little material deterioration because recrystallization occurs at room temperature, and are inexpensive. .

  However, in recent years, the toxicity of lead to the human body has been pointed out, and development of other dampers in place of lead dampers has been promoted in consideration of the environment and health. For example, Patent Document 1 discloses a base isolation structure using a plastic having a breaking elongation of 50% or more as a base isolation damper material. However, plastic itself is not suitable for use as an energy absorbing material because it does not have sufficient deformability to follow deformation such as roll.

Patent Document 2 discloses a seismic isolation rubber support structure in which a plurality of strands made of a metal material are arranged in the longitudinal direction in the hollow portion of the laminate. This seismic isolation rubber bearing structure exhibits damping characteristics due to the release of static friction between the wires during shear deformation. However, if a plurality of strands are simply placed in the hollow portion of the laminate, the strands are not constrained, and sufficient attenuation characteristics cannot be obtained.
Japanese Patent No. 2658024 JP 10-238161 A (Claim 1, [0012])

  An object of the present invention is to reduce the adverse effects on the environment without using lead, and to provide a composite damper having high damping performance against impact or vibration, and sufficient seismic isolation performance and damping performance provided with this damper. Is to provide a seismic isolation structure.

  As a result of intensive research to solve the above-mentioned problems, the present inventors have found that a plurality of wires such as metal wires are aligned in a direction orthogonal to the direction of shear deformation, and are soft and stretchable plastics. The composite damper, which is integrated and combined, has a new fact that it is excellent in energy absorption capability of shock or vibration and has high damping performance, and has completed the present invention.

  That is, the composite damper of the present invention (hereinafter simply referred to as a damper) has an impact or vibration energy absorption capability, and contains a wire selected from a metal wire, an organic fiber, and an inorganic fiber, and the wire. It is composed of a composite of soft and stretchable plastic, and the wire is aligned in a direction orthogonal to the direction of shear deformation. Here, the direction perpendicular to the direction of shear deformation usually refers to the longitudinal direction of the damper, and in the case of a roll such as an earthquake, it refers to the vertical direction or the vertical direction.

  The wire is preferably used in the form of a stranded wire obtained by twisting a plurality of wires in order to develop viscoelasticity. Moreover, it is preferable that the said wire is arrange | positioned in the damper longitudinal direction, and has the length of at least 2/3 of a damper full length. Furthermore, the surface of the wire is preferably covered with a rubber material, and it is particularly preferable that the rubber material has a spiral shape and is covered around the wire.

The first seismic isolation structure of the present invention includes a laminate in which rigid hard plates and rubber layers are alternately laminated, and the damper provided in a hollow portion formed in the lamination direction of the laminate. It is provided with.
The second seismic isolation structure of the present invention is characterized in that a laminated body in which rigid hard plates and rubber layers are alternately laminated and the damper are provided in parallel.

  In addition, the damper of the present invention can be used not only for the above-described seismic isolation structure but also as a damper for absorbing shocks and vibrations of a machine alone.

  The damper according to the present invention has a plurality of wires such as metal wires aligned in a predetermined direction and is combined with a soft and stretchable plastic, so that the shear load with respect to shear displacement (strain) is accompanied by a large hysteresis. Or it has the effect that it is excellent in the energy absorption capability of vibration, and has high damping performance. Therefore, when the damper of the present invention is used in combination with a laminate in which hard plates and rubber layers are alternately laminated, a seismic isolation structure having a high seismic isolation effect and a damping effect can be obtained. .

  Hereinafter, a seismic isolation structure according to an embodiment of the present invention will be described in detail with reference to the drawings. Fig.1 (a) is a top view which shows the seismic isolation structure 11 concerning this embodiment, FIG.1 (b) is the sectional view on the AA line. As shown in FIGS. 1 (a) and 1 (b), the seismic isolation structure 11 includes a laminated body in which rigid hard plates 12 and rubber layers 13 are alternately laminated, and perforated in the lamination direction of the laminated body. And a damper 15 disposed in the hollow portion 14 provided.

  The hard plate 12 includes an internal hard plate 12a arranged inside the seismic isolation structure 11, an upper hard plate 12b arranged at the upper portion, and a lower hard plate 12c arranged at the lower portion. As these hard boards 12, materials, such as metal plates, such as a steel plate, ceramics, a hard plastic board, can be used, for example. The internal hard plate 12a may have a thickness of about 1 to 6 mm and a number of about 2 to 50. The upper hard plate 12b and the lower hard plate 12c may have a thickness of about 10 to 60 mm.

  The rubber layer 13 includes a vulcanizing agent, a vulcanization accelerator, a vulcanization acceleration aid, an anti-aging agent, a reinforcing agent, a retarder, a plasticizer, and a colorant as necessary, in the rubber component as a main component. It is a combination of agents. As for the rubber layer 13, it is good that the thickness of each layer is about 1-50 mm.

  As the rubber component, for example, a diene rubber can be used. Examples of the diene rubber include natural rubber and synthetic rubber such as chloroprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butadiene rubber, isoprene rubber, butyl rubber, and halogenated butyl rubber. Known ingredients can be used as the compounding agents such as a vulcanizing agent, a vulcanization accelerator, a vulcanization acceleration aid, an anti-aging agent, a reinforcing agent, a retarder, a plasticizer, and a colorant.

  The damper 15 is a composite of a wire 16 and a plastic 17. Examples of the wire 16 include a combination of one or more selected from metal wires, organic fibers, and inorganic fibers, and particularly those having high strength, high flexibility, and viscoelastic effects exhibit the large hysteresis described above. It is preferable in obtaining. Examples of the metal wire having such characteristics include a wire made of iron, stainless steel, or the like. Examples of the organic fiber or inorganic fiber include glass fiber and aramid fiber (trade name “Kevlar” manufactured by DuPont).

The thickness of the wire 16 is not limited as long as it satisfies the condition that it has high strength, high flexibility, softness, and low elongation, in particular, low elongation. It is preferable to use the wire 16, especially a metal wire, in the form of a stranded wire obtained by twisting a plurality of wires (element wires). The stranded wire may be a so-called cable in which a plurality of strands (for example, 4 to 30 strands) are twisted, or a plurality of strands (for example, 4 to 35 strands) that are further twisted. Can be used. In this case, it is usually preferable to use a wire having a thickness (diameter) of about 0.1 to 1 mm. As the stranded wire, one having a thickness (diameter) of about 3 to 6 mm is usually used. Also when using organic fiber or inorganic fiber, it is preferable that it is a twisted yarn like the above-mentioned twisted wire. Usually, the fiber diameter is about 0.1 to 1 mm, and the diameter of the twisted yarn is about 3 to 6 mm. Is appropriate.
Further, the length of the wire 16 may be such a length that the adjacent wires 16 at least partially overlap each other even if the damper undergoes shear deformation. Specifically, for example, the length of the damper 15 ( It is preferable to use one having a length equal to or equal to at least 2/3 of the total length in the axial direction).

  The plastic 17 containing the wire 16 is preferably soft and stretchable. For example, polyethylene, polypropylene, polystyrene, ABS resin, polyvinyl chloride, fluororesin, poly (meth) acrylate, polyvinyl ether, polyamide, Examples include polyethylene terephthalate, alkyd resin, polycarbonate, silicone resin, phenol resin, acetal resin, polyether resin, epoxy resin, polyurethane resin, and the like.

  In order to strengthen the bonding between the wire 16 and the plastic 17, the wire 16 is preferably surface-treated. Specifically, for example, the surface of the wire 16 is preferably covered with a rubber material. The rubber material is more preferably spirally coated around the wire. As a result, even with repeated impacts and vibrations, the wire can follow the extension of the damper 15 and return to the original position.

  The wire 16 is aligned in a direction orthogonal to the direction in which the damper 15 is shear-deformed. Specifically, when the damper 15 is disposed in the hollow portion 14 of the seismic isolation structure 11 shown in FIG. 1, the wire 16 is aligned in the longitudinal direction (axial direction) of the hollow portion 14. That is, in the case of an earthquake, the direction of shear deformation is the horizontal direction, so the wire 16 is aligned in the vertical direction. Moreover, in the cross-sectional area orthogonal to the longitudinal direction of the damper 15, the ratio which the cross-sectional area of the wire 16 occupies is good to be about 30 to 90%. If the proportion of the wire 16 is outside this range, the desired attenuation performance may not be obtained.

  The seismic isolation structure 11 as described above can be manufactured, for example, as follows. First, an internal hard plate 12a, an upper hard plate 12b, and a lower hard plate 12c provided with holes for inserting the dampers 15 are prepared, and these hard plates 12a, 12b, and 12c are placed in a mold at predetermined intervals. Deploy. Next, a rubber composition in which various compounding agents are blended with the rubber component is injected into the mold by injection or the like and bonded together at the same time as the vulcanization molding, whereby the hollow portion 14 is perforated. Create a body. And the damper 15 shape | molded previously in the hollow part 14 of this laminated body is inserted, and the seismic isolation structure 11 is obtained.

  Moreover, the seismic isolation structure 11 can also be manufactured as follows. First, a rubber composition in which various compounding agents are blended with a rubber component is molded by injection molding, extrusion molding or the like to produce a plurality of rubber layers 13 having a predetermined thickness. These rubber layers 13 are provided with holes for inserting the dampers 15 simultaneously with molding or by processing after molding. Further, an internal hard plate 12a, an upper hard plate 12b, and a lower hard plate 12c provided with holes for inserting the dampers 15 are prepared. Next, the rubber layer 13 and the hard plates 12a, 12b, and 12c are laminated and bonded with an adhesive or the like, so that a laminated body in which the hollow portion 14 is formed is manufactured. And the damper 15 shape | molded previously in the hollow part 14 of this laminated body is inserted, and the seismic isolation structure 11 is obtained. Examples of the adhesive include thermoplastic adhesives such as vinyl acetate, acrylic, ethylene copolymer, dope cement, monomer cement, polyamide, polyester, polyurethane; chloroprene rubber, nitrile rubber, recycled rubber, styrene- Examples thereof include rubber adhesives such as butadiene rubber (SBR) and natural rubber.

  The damper 15 may be formed in advance as described above, or a bundle of wires 16 is first inserted into the hollow portion 14 obtained above, and then a plastic material is injected and solidified or cured. Thus, the damper 15 may be formed. Similarly, when the damper 15 is formed in advance, the damper 15 may be formed by inserting a bundle of wires 16 into a mold and then injecting a plastic material to solidify or harden it.

  In the above-described embodiment, the case where the planar shape of the seismic isolation structure is circular has been described as an example. However, the planar shape may be an ellipse, a rectangle, a hexagon, or the like. Further, the number of laminated hard plates, the number of laminated rubber layers, the number of dampers, and the like may be set as appropriate according to the use situation, and are not limited to the above embodiment. Usually, about 1 to 10 dampers are appropriate.

<Other embodiments>
FIG. 2 is a cross-sectional view showing a seismic isolation structure according to another embodiment of the present invention. As shown in FIG. 2, the seismic isolation structure 21 includes a laminated body in which rigid hard plates 22 and rubber layers 23 are alternately laminated, and a damper 25. Flange 26,27 is attached to the upper and lower sides of the laminated body and the damper 25, and is interposed between the foundation 28 and the structure 29 (building etc.).

  The damper 25 is preferably a columnar body, for example, and a bundle of wire rods 16 is inserted into a predetermined mold, and a plastic material is injected in a state of being aligned in the longitudinal direction to be solidified or cured to be combined with the plastic 17. That's fine. The number of laminated bodies and dampers 25 and the attachment positions are not particularly limited. Others are the same as in the above-described embodiment.

(a) is a top view which shows the seismic isolation structure concerning one Embodiment of this invention, (b) is the AA sectional view taken on the line. It is sectional drawing which shows the seismic isolation structure concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Seismic isolation structure 12 Hard plate 13 Rubber layer 14 Hollow part 15 Damper 16 Wire material 21 Seismic isolation structure 25 Damper

Claims (7)

  It is composed of a composite of a wire selected from metal wires, organic fibers and inorganic fibers and a soft and stretchable plastic containing this wire, and the wire is in a direction perpendicular to the direction of shear deformation A composite damper having shock or vibration energy absorption capability, characterized by being aligned.   The composite damper according to claim 1, wherein the wire is used in the form of a stranded wire obtained by twisting a plurality of wires.   The composite damper according to claim 1, wherein a surface of the wire is covered with a rubber material.   The composite damper according to claim 3, wherein the rubber material is spirally coated around the wire.   A laminated body in which rigid plates and rubber layers having rigidity are alternately laminated, and the composite damper according to any one of claims 1 to 4 provided in a hollow portion drilled in a laminating direction of the laminated body. A base-isolated structure characterized by comprising   The seismic isolation structure according to claim 5, wherein the wires in the composite damper are aligned in the axial direction of the hollow portion. A base-isolated structure comprising a laminated body in which rigid hard plates and rubber layers are alternately laminated, and the composite damper according to any one of claims 1 to 4.

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