JP2009210064A - Laminated support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated support that has damping property equivalent to that of lead even in a fine strain region. <P>SOLUTION: A plug 4 comprises a combination of one or more first members 21 formed by filling a plastic fluid material composed of elastic perfect plastic body with hard fillers and one or more second members 22 composed of a low-yield material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a laminated support for supporting a structure such as a building.

  In order to reduce the excitation force acting on structures such as buildings due to earthquakes, etc., this structure was placed around a columnar plug with a laminate consisting of alternating elastic and rigid plates. Supporting with a laminated support is performed, and such a laminated support supports a vertical load, and the elastic force of the rubber layer against the horizontal excitation force causes the excitation force to be a structure. As a result, the vibration energy can be converted into heat and attenuated by the damping performance of the plug.

And, metal such as lead has been used to give the plug high damping performance, but lead is costly when it is discarded due to environmental problems. For example, it is mainly made of unvulcanized rubber. It has been proposed to form a plug by filling a plastic fluid material made of a rubber composition with a hard filler such as iron powder (see, for example, Patent Document 1).
JP 2006-316990 A

  However, the laminated support provided with such a plug exhibits a damping characteristic equivalent to that of lead in a large deformation, but has a low damping characteristic with respect to a minute strain, and there has been a demand for improvement in this respect.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a laminated support having a damping characteristic equivalent to that of lead even in a minute strain region.

The invention according to claim 1 is a laminate support in which a laminate formed by alternately laminating elastic plates and rigid plates is disposed around a columnar plug.
Combining the plug with one or more first members made of a plastic fluid material made of an elastic perfect plastic material and a hard filler, and one or more second members made of a low yield material excluding lead. It is the laminated support body comprised.

  A second aspect of the present invention is the method according to the first aspect, wherein the plug is configured in a columnar shape, the second member is disposed at the center in the radial direction, and the first member is disposed around the second member. A laminated support.

  A third aspect of the present invention is the laminated support according to the first or second aspect, wherein the plastic flow material has a shear yield stress σy of 0.1 pa to 10 Mpa.

  A fourth aspect of the present invention is the laminated support according to any one of the first to third aspects, wherein the hard filler is made of a metal.

  A fifth aspect of the present invention is the laminated support according to the fourth aspect, wherein the metal is iron powder.

  According to the first aspect of the present invention, the plug is made of one or more first members obtained by filling a rigid fluid into a plastic fluid material made of an elastic perfect plastic material, and a low yield material excluding lead. Since it is configured by combining one or more second members, high damping performance can be carried even in a low strain region without using lead.

  According to the second aspect of the present invention, since the plug is formed in a columnar shape, the second member is disposed at the center in the radial direction, and the first member is disposed around the second member, the shape retaining property is poor. By restraining the two members with the surrounding first member, the shape can be stabilized and the performance can be maintained.

  According to invention of Claim 3, since the shear yield stress (sigma) y of the said plastic fluidity material was 0.1pa-10Mpa, the damping performance of a 1st member can be made high.

    According to the invention described in claim 4, since the hard filler is made of metal, the damping performance of the first member can be further enhanced.

    According to the invention described in claim 5, since the metal is iron powder, the damping performance of the first member can be further enhanced.

  The laminated support body of embodiment which concerns on this invention is demonstrated with reference to figures. 1 and 2 are sectional views showing the laminated support of this embodiment. FIG. 1 shows the laminated support in a state where no shear deformation is performed, and FIG. 2 shows the laminated support in a state where shear deformation is performed. The laminated support body 10 is configured by disposing a laminated body 3 having an annular cross section formed by alternately laminating the rubber layers 1 and the rigid plates 2 around the columnar plugs 4. It is attached between the object 8 and the support base 9 and functions to reduce the transmission of the vibration force in the horizontal plane acting on the support base 9 due to an earthquake or the like to the structure 8 and to attenuate the energy. The rigid plate 2 is made of a highly rigid plate material such as metal or plastic.

  In FIGS. 1 and 2, a cover rubber 5 that protects the laminated body 3 can be disposed around the laminated body 3. In the figure, reference numeral 6 denotes a flange for attaching the laminated support 10 to the structure 8 and the support base 9.

  The laminated support 10 is characterized by one or more first members 21 in which the plug 4 is made of a plastic fluid material made of an elastic perfect plastic material and a hard filler, and one or more made of a low yield material. The second member 22 is combined with the second member 22, whereby high energy attenuation characteristics can be provided in a wide region including a low strain region. Hereinafter, the details of the plug 4 will be described.

  The first member 21 of the plug 4 is configured by filling a plastic fluid material 11 made of an elastic perfect plastic material with a hard filler 12, and, for example, as shown in an enlarged sectional view of a part thereof in FIG. The spherical body 12 is disposed in the material 11 as a hard filler.

  As shown in Fig. 4, this elastic perfect plastic body is proportional to the shear stress and the shear strain up to a certain yield point, but when this yield point is exceeded, the shear stress becomes a constant value σy. Refers to the material shown. In the figure, εb represents shear fracture strain.

  In the laminated support body 10 configured as described above, the laminated body 4 undergoes shear deformation as shown in 2 by the horizontal movement (vibration) between the support base 9 and the structure 8 supported thereby, Due to the elasticity, transmission of this excitation force to the structure 8 is reduced. At this time, the plastic fluidized material 11 in the first member 21 of the plug 4 also undergoes shear deformation as a whole while flowing, and absorbs the vibration energy. And since the spherical body 12 as a hard filler is filled in the plastic fluid material 11, not only the plastic fluid material 11 contacts the inner peripheral surface of the laminated body 3, but also the plastic fluid material 11 and the spherical body 12 are used. And the relative movement due to friction, the damping characteristics are improved, and a larger damping force can be exerted to absorb energy.

  In particular, in the present invention, since the plastic fluidized material 11 is formed of an elastic perfect plastic material (non-hardened elastic plastic material), the dispersion state of the filled spherical body 12 (hard filler) is stabilized. That is, the spherical body 12 is uniformly distributed within the plastic fluidized material 11 without being inadvertently precipitated or unevenly distributed. For this reason, the damping characteristic of the plastic fluidized material 11 does not change partially, and stable damping performance can be exhibited.

  In the present embodiment, the spherical body 12 formed in a spherical shape is given as an example of the hard filler of the present invention. However, as the hard filler, the plastic flow material 11 is filled to cause plastic flow. If it can contact with the material 11 and can increase a contact area, it will not specifically limit, For example, the column-shaped hard filler 14 shown to the spheroid-shaped hard filler 13 and 5 (B) shown to 5 (A), Examples thereof include an L-shaped hard filler 15 shown in 5 (C) and a U-shaped hard filler 16 shown in 5 (D). Further, as shown in 5 (E), a chain-like hard filler 18 having a structure in which a plurality of oval annular members 17 are connected in a chain may be used. The annular member 17 constituting the chain-like hard filler 18 does not have to be a completely closed annular shape. For example, a U-shaped member that is partially open, a horseshoe-shaped member, a spiral member, etc. Even if it is a shape, a spiral shape, etc., it may be in a “substantially annular” shape so that the connected state is not inadvertently eliminated.

  Note that it is preferable that the hard filler is spherical as in the present embodiment, since the directionality is lost, and stable damping characteristics can be exhibited in any direction. In this case, the “spherical shape” includes a complete spherical shape, but may not be a complete spherical shape as long as it has substantially no direction dependency. For example, it may be a regular polyhedron shape, a hard filler 19 having a shape as shown in FIG. 5F (a soccer ball shape whose surface is formed of a pentagon and a hexagon), or the like. In the case of a regular polyhedron shape, the larger the number of faces, the closer to a sphere and the directionality is eliminated, which is preferable.

  Moreover, it is preferable to use a hard filler as a granular material because the dispersion state in the plastic fluidized material 11 becomes good and the damping performance is stabilized. For example, since each of the above-mentioned spheroid shape, columnar shape, L-shape, and U-shaped hard filler is independent of the behavior of the hard filler in the plastic fluidized material 11, Can be considered.

  When the hard filler is granular, it is preferable that the maximum particle diameter d is 0.002 mm or more and 2.0 mm or less because high damping performance can be obtained. Further, it is more preferable that the maximum particle diameter d is 0.01 mm or more and 0.06 mm or less because higher attenuation performance can be obtained.

  The material of the hard filler may be any material as long as it can be regarded as rigid with respect to the plastic fluid material 11, but it is preferable to use a metal from the viewpoint of obtaining a large damping characteristic. More preferably, this is iron powder.

  The volume ratio of the hard filler to the plastic fluidized material 11 is preferably 25% or more and 74% or less. By setting the volume filling rate of the hard filler to 25% or more, a large contact area between the plastic fluidized material 11 and the hard filler can be secured and a large damping force can be obtained.

  Further, by setting the volume filling rate to 74% or less, it is possible to prevent the hard fillers from contacting each other and to maintain high damping performance.

  In short, if the plastic fluidized material 11 is made of an elastic perfect plastic material (non-hardened elastic plastic material), the dispersion state of the hard filler can be stabilized. In particular, the shear yield stress σy of the plastic fluidized material is preferably 0.1 Mpa or more and 10 Mpa or less. That is, by setting the pressure to 0.1 Mpa or more, it is possible to obtain sufficient attenuation performance. By setting the pressure to 10 MPa or less, the plastic fluidized material can be greatly plastically deformed.

  In the example shown in FIGS. 1 and 2, the plug 4 is an arrangement in which such a first member 21 is formed in a cylindrical shape, and a space portion inside the cylinder is replaced with a second member 22 made of a columnar low yield material. It consists of Here, the low yield material means a material having an excellent deformation characteristic with a yield point of 220 MPa or less and an elongation of 40% or more, and such a low yield material exhibits high damping performance even in a small strain region. As specific examples of such materials, Cu, Sn, Al, Pb and alloys thereof, Al-Zn, low yield point steel, low yield point resin, and the like can be given.

  FIG. 6 is an SS curve obtained by measuring the relationship between shear strain and shear stress with respect to an example and a comparative example whose details will be described later. In the example, a cylindrical shape is formed around the cylindrical second member 22. The laminated support body 10 having the plug 4 configured by arranging the first member 21 is different from the embodiment in that the comparative example includes the plug 4 having the same size as the embodiment only by the first member. As shown in FIG. 5, when the second member 22 is loaded on the first member, the plug has a characteristic of undergoing large plastic deformation in the low strain region, thereby increasing the energy absorption during the low strain deformation. be able to.

  In the above description, the first member 21 is arranged around the second member 22 as shown in FIG. 7 as a combination mode of the first member and the second member constituting the plug 4. For example, the plug 4A may be configured by arranging the second member 22A around the first member 21A as shown in FIG. 8, and as shown in FIG. A plurality of cylindrical second members 22B may be arranged in the first member 21B to form the plug 4B. Furthermore, although not shown, the first member and the second member may be stacked in the height direction. Good.

  1 and 2, a laminated support 10 having a plug 4 comprising a cylindrical first member 21 and a second member 22 inserted inside thereof is taken as an example. Using only the first member as a comparative example, a laminated support different from the examples was used as a comparative example, and these laminated supports were prototyped. Was measured. The results are shown in the shear strain-shear stress curve diagrams of FIGS. FIG. 10 corresponds to the high distortion amplitude, and FIG. 11 corresponds to the low distortion amplitude.

The common specifications for the above four examples are as follows.
1) Outer diameter of laminated support: 225mm
2) Laminated support height (excluding flange): 64.2mm
3) Number of rigid plates: 24 4) Thickness of rigid plate: 0.8mm
5) Material of rigid plate: Steel plate 6) Material of rubber layer: Natural rubber 7) Outer diameter of plug: 45mm
8) Compounding of plastic fluidized material Unvulcanized rubber: 100 parts by mass Carbon black: 120 parts by mass Resin (phenol resin, etc.): 60 parts by mass 9) Shear yield stress σy of plastic fluidized material: 7.3 MPa
10) Material of hard filler: iron powder 11) Shape of hard filler: irregular shape 12) Average particle size of hard filler: 0.4mm
13) Volume percentage of hard filler to plastic fluid: 65%
15) Material of the second member; Sn (Example only)
16) Outer diameter of second member: 22.5mm (Example only)

The test conditions are as follows, and the hysteresis loop in the shear strain-shear stress curve diagram of FIG. 10 is the third loop.
Excitation displacement amplitude: When the total thickness of the laminated elastic body is 100%, 60% (at low strain amplitude, corresponding to the first loop in FIG. 11) and 100% (at high strain amplitude, third loop in FIG. 10) Corresponding to eyes)
Excitation frequency: 0.33Hz
Vertical contact pressure: 10Mpa

  As is apparent from FIG. 7, it can be seen that the plug of the example shows high damping performance even in the low strain region, compared to the plug of the comparative example configured by only the first member.

It is sectional drawing which shows the laminated support body of embodiment which concerns on this invention in a state without shear deformation. It is sectional drawing which shows the laminated support body of embodiment which concerns on this invention in the state which carried out the shear deformation. It is sectional drawing which expands and shows a part of plug. FIG. 2 is a shear strain-shear stress curve diagram for explaining an elastic perfect plastic body. It is a perspective view which illustrates the shape of a hard filler. It is a SS curve with respect to an Example and a comparative example. It is sectional drawing and a top view which show the plug in the laminated support body of this embodiment. It is sectional drawing and the top view which show the plug of a modification. It is sectional drawing and a top view which show the plug of another modification. It is a shear strain-shear stress curve figure in a high strain area | region of an Example and a comparative example. It is a shear strain-shear stress curve figure in a low strain area | region of an Example and a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rubber layer 2 Rigid board 3 Laminated body 4 Plug 5 Cover rubber 6 Flange 8 Structure 9 Support base 10 Laminated support 11 Plastic fluid material 12 Spherical body 13 Spheroid-shaped hard filler 14 Cylindrical hard filler 15 L-shape Hard filler 16 U-shaped hard filler 17 annular member 18 chain hard filler 19 hard filler 21 first member 22 second member

Claims (5)

In a laminated support in which a laminated body formed by alternately laminating elastic plates and rigid plates is arranged around a columnar plug,
Combining the plug with one or more first members made of a plastic fluid material made of an elastic perfect plastic material and a hard filler, and one or more second members made of a low yield material excluding lead. A laminated support comprising the above components.   The laminated support according to claim 1, wherein the plug is formed in a columnar shape, the second member is arranged at the center in the radial direction, and the first member is arranged around the second member.   The laminated support according to claim 1 or 2, wherein a shear yield stress σy of the plastic fluidized material is 0.1 to 10 MPa.   The laminated support according to any one of claims 1 to 3, wherein the hard filler is made of metal.   The laminated support according to claim 4, wherein the metal is iron powder.

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