JP2005299762A - Manufacturing method for laminated rubber supporting body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a laminated rubber supporting body for obtaining base isolation performance equal to that of a vibration energy absorbing material containing lead or more using a vibration energy absorbing material other than lead. <P>SOLUTION: At least one through hole 13 is formed in the vertical direction in a laminated body 10 composed by laminating a plurality of rubber plates 11 and a plurality of metallic plates 12 alternately in the vertical direction. A non-lead metallic plug 14 is inserted into the through hole 13 by pressure of at least 100 MPa, and then shearing strain is applied to the laminated body 10 in a scope of 25 to 250 % of total wall thickness of the plurality of rubber plates 11 while pressure of at least 15 MPa is applied to a pressure receiving face of the laminated body 10 in which the non-lead metallic plug 14 is inserted. The non-lead metallic plug is a round bar made of metal capable of absorbing vibration energy other than lead. The total wall thickness of the plurality of rubber plates is total wall thickness obtained by adding wall thickness of all the rubber plates except the metallic plates among the metallic plates and the rubber plates constituting the laminated body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method of manufacturing a laminated rubber bearing used for seismic isolation of a structure.

  2. Description of the Related Art Conventionally, seismic isolation devices as shown in FIGS. 1 and 2 are known for isolating buildings, civil engineering structures, equipment, and the like. That is, in FIG.1 and FIG.2, the through-hole 13 is provided in the center of the laminated body 10 formed by alternately laminating the plurality of rubber plates 11 and the plurality of steel plates 12, and a round bar made of lead is formed in the through-hole 13. That is, the lead plug 14 is inserted. In order to attach the laminated body 10 to a foundation or a structure, connecting steel plates 15 and 16 are fixed to both ends of the laminated body 10, and a plurality of flange fittings 17 and 18 are respectively fastened via the connecting steel plates 15 and 16. The bolts 19 are fixed.

Such a seismic isolation device with a lead plug has both the functions of a conventional laminated rubber and a damper, which are deformed in the horizontal direction and reduce seismic energy when an earthquake occurs while stably supporting a building or the like. Furthermore, the installation space can be reduced and the workability is improved (see Patent Document 1 and Patent Document 2).
Japanese Patent Publication No. 61-17984 JP 11-125306 A

By the way, the above technique has the following problems to be solved.
Since the seismic isolation device with lead plugs uses lead, which is a hazardous substance, there are concerns about environmental destruction. In addition to handling lead at the time of manufacturing, there is a possibility that problems will arise in the disposal method of seismic isolation equipment containing lead that will be generated at the time of building dismantling, and there is an increasing demand for materials that replace lead.
Several vibration energy absorbing materials can be listed as alternative materials for lead. Conventionally, seismic isolation devices equipped with an energy absorber that exhibits a damping effect equivalent to or better than that of lead using materials other than lead have been manufactured in earnest. There are no examples. Therefore, the manufacturing method of the seismic isolation apparatus using energy absorption materials other than lead is not established. In the case of a lead plug, press-fitting is possible if a pressure of about 60 MPa is applied, but a metal plug other than lead, such as tin or aluminum, cannot be press-fitted sufficiently with a pressure capable of press-fitting lead.

  An object of this invention is to provide the manufacturing method of the laminated rubber bearing body from which vibration isolation material other than lead is used and the seismic isolation performance equivalent to or more than lead containing is obtained.

The present invention adopts the following configuration in order to solve the above points.
<Configuration 1>
At least one through hole is formed in a vertical direction in a laminate formed by alternately laminating a plurality of rubber plates and a plurality of metal plates in the vertical direction, and a lead-free metal plug is provided in the through hole at least 100 MPa. 25 to 250% of the total thickness of the plurality of rubber plates in the laminated body with a pressure of at least 15 MPa applied to the pressure-receiving surface of the laminated body into which the lead-free metal plug has been inserted. A method for producing a laminated rubber bearing, characterized by applying shear strain in the range of

  A non-lead metal plug refers to a round bar made of a metal that can absorb vibration energy other than lead. The total thickness of the plurality of rubber plates refers to the total thickness obtained by integrating the thicknesses of all the rubber plates, excluding the metal plates, among the metal plates and rubber plates constituting the laminate. In order to apply a shear strain to the laminate, for example, both ends of the laminate are relatively reciprocated in the horizontal direction while both ends of the laminate are held. The laminate is tilted and shear strain, that is, horizontal displacement occurs.

<Configuration 2>
At least one through hole is formed in a vertical direction in a laminate formed by alternately laminating a plurality of rubber plates and a plurality of metal plates in the vertical direction, and a lead-free metal plug is provided in the through hole at least 100 MPa. 25 to 250% of the total thickness of the plurality of rubber plates in the laminated body with a pressure of at least 20 MPa applied to the pressure-receiving surface of the laminated body into which the lead-free metal plug has been inserted. A method for producing a laminated rubber bearing, wherein a shear strain in the range of is applied.

  The pressure applied to the laminated body is increased as compared with Configuration 1.

<Configuration 3>
At least one through hole is formed in a vertical direction in a laminate formed by alternately laminating a plurality of rubber plates and a plurality of metal plates in the vertical direction, and a lead-free metal plug is provided in the through hole at least 100 MPa. 25 to 250% of the total thickness of the plurality of rubber plates in the laminated body with a pressure of at least 30 MPa applied to the pressure-receiving surface of the laminated body into which the lead-free metal plug has been inserted. A method for producing a laminated rubber bearing, wherein a shear strain in the range of is applied.

  Compared with configuration 2, the pressure applied to the laminate is increased.

<Configuration 4>
4. A method for manufacturing a laminated rubber bearing according to any one of claims 1 to 3, wherein the lead-free metal plug is inserted into the through hole with a pressure of at least 200 MPa. .

  This corresponds to a case where a higher insertion pressure into the through hole is required depending on the material of the lead-free metal plug.

<Configuration 5>
In the method for producing a laminated rubber bearing according to any one of Structures 1 to 4, the lead-free metal plug is made of at least one selected from tin, copper, aluminum, zinc, and alloys thereof. Manufacturing method of laminated rubber bearing.

  As the lead-free metal plug, a metal other than lead that can efficiently absorb vibration energy is used.

<Configuration 6>
At least one through hole is formed in a vertical direction in a laminate formed by alternately laminating a plurality of rubber plates and a plurality of metal plates in the vertical direction, and a lead-free metal plug is provided in the through hole at least 100 MPa. Inserted with pressure, and then applied a pressure larger than the actual support load to the pressure-receiving surface of the laminate with the lead-free metal plug inserted, the total thickness of the plurality of rubber plates is applied to the laminate. A method for producing a laminated rubber bearing, wherein a shear strain in the range of 25 to 250% is applied.

  The method of Configuration 6 is effective when the situation in which the laminated rubber bearing is actually used has been accurately determined.

  Hereinafter, embodiments of the present invention will be described using specific examples.

  In this embodiment, a laminated rubber bearing having the structure shown in FIGS. 1 and 2 is used. In order to produce such a laminated rubber bearing, the following steps are performed. First, a plurality of rubber plates 11 and a plurality of metal plates 12 are alternately stacked in the vertical direction to form a stacked body 10 having through holes 13 in the vertical direction. A metal plug other than lead (non-lead metal plug), for example, a tin plug (round bar made of tin) 14 is inserted into the through hole 13 of the laminated body at a pressure of at least 100 MPa. Thereafter, by applying a shear strain in the range of 25 to 250% of the total rubber thickness to the laminate 10 with a pressure of at least 15 MPa applied to the pressure-receiving surface of the laminate 10 with the tin plug 14 inserted, The final laminated rubber bearing is manufactured.

  As the lead-free metal plug 14, a round bar made of tin, copper, aluminum, zinc, or an alloy thereof, that is, a tin alloy, a copper alloy, an aluminum alloy, or a zinc alloy is used. Has a large outer diameter. Therefore, the lead-free metal plug 14 is press-fitted into the through hole 13 at a pressure of at least 100 MPa, expands in the radial direction, and is in close contact with the inner wall of the through hole.

  The total rubber thickness refers to the total thickness obtained by integrating the thicknesses of all the rubber plates 11 except for the metal plate 12. By applying a relative shear force to both ends of the laminate, shear strain, that is, horizontal displacement occurs in the laminate.

  In the present invention, the pressure inserted into the through-hole 13 of the laminate by the metal material of the metal plug is set to 200 MPa or more, or the shear pressure of the laminate 10 is applied when a shear strain in the range of 25 to 250% of the total rubber wall thickness is applied. A pressure of 20 MPa or more may be applied to the surface.

〔Consideration〕
Here, since the present inventors examined the manufacturing conditions which can obtain suitable performance about a tin plug as an alternative material of a lead plug, it will be described.

[Configuration of specimen]
As a test body, a laminated rubber bearing body having the same configuration as in FIGS. 1 and 2 was manufactured under the following conditions.
A plurality of laminates 10 having a through hole 13 at the center were manufactured using 33 rubber plates 11 and 32 metal plates 12 under the following conditions.
A laminated body including a tin plug formed by press-fitting a tin plug made of 99.9% purity tin into the through hole 13 at 200 MPa, and a lead plug made of 99.99% purity lead into the through hole 13 at 60 MPa. Two types of laminates containing lead plugs were manufactured.

  Connected steel plates 15 and 16 are fixed to both ends of each of these laminates by a conventional method, and upper and lower flange fittings 17 and 18 are respectively arranged on the connected steel plates 15 and 16 by a plurality of fastening bolts 19. A laminated rubber bearing with tin plug and a laminated rubber bearing with lead plug of the same size were manufactured.

In addition, as the rubber plate 11 of the laminated body, a circular rubber having an outer diameter of 500 mm, an inner diameter of 100 mm, and a wall thickness of 3.75 mm made of natural rubber having a shear modulus of 0.44 N / mm ² was used. As the metal plate 12, a steel plate formed into an annular shape having an outer diameter of 510 mm, an inner diameter of 100 mm, and a wall thickness of 3.2 mm was used. The connecting steel plates 15 and 16 have an annular shape with an outer diameter of 520 mm and a wall thickness of 16 mm, and the upper and lower flange fittings 17 and 18 are disks with an outer diameter of 800 mm and a wall thickness of 30 mm. The height of the laminated rubber support is about 310 mm.

[Applying force to the specimen]
The two types of test specimens were applied under various conditions, and the following tests (1) to (9) were conducted to examine the relationship between the respective loads and displacements.
In addition, in the test conditions, for example, in order to apply a shear strain of ± 25% of the total thickness of the rubber plate, while holding both ends of the laminate, among the metal plate and the rubber plate constituting the laminate, With a stroke of 25% of the total thickness of all the rubber plates excluding the metal plate, a shearing force was applied to both ends to reciprocate relatively in the horizontal direction. The same applies to the case where shear strain is applied by other strokes. The state in which a vertical load of 10 MPa is applied to the pressure-receiving surface of the laminated rubber bearing body assumes a state in which a pressure slightly larger than the support load of a building or the like during actual use is applied.

(1) A shearing force of ± 25% of the total thickness of the rubber plate is generated by applying a shearing force to the laminated rubber bearing body with tin plug in a state where a vertical load of 10 MPa is applied to the pressure receiving surfaces at both ends. I let you. This was carried out for 4 cycles. The relationship between load and displacement at this time is shown in FIG.

(2) Similarly, in the state where a vertical load of 10 MPa is applied to the pressure-receiving surfaces at both ends of the laminated rubber bearing body with tin plug, a shearing force is applied to give a shear strain of ± 50% of the total thickness of the rubber plate. Was generated. This was carried out for 4 cycles. FIG. 4 shows the relationship between load and displacement at this time.

(3) Similarly, in a state where a vertical load of 10 MPa is applied to the pressure-receiving surfaces at both ends of the laminated rubber bearing body with tin plug, a shearing force is applied to give a shear strain of ± 100% of the total thickness of the rubber plate. Was generated. This was carried out for 4 cycles. FIG. 5 shows the relationship between load and displacement at this time.

(4) Similarly, in the state where a vertical load of 10 MPa is applied to the pressure-receiving surfaces at both ends of the laminated rubber bearing body with tin plug, a shearing force is applied to give a shear strain of ± 150% of the total thickness of the rubber plate. Was generated. This was carried out for 4 cycles. The relationship between load and displacement at this time is shown in FIG.

(5) Similarly, in a state where a vertical load of 10 MPa is applied to the pressure receiving surfaces at both ends of the laminated rubber bearing body with tin plug, a shearing force is applied to give a shear strain of ± 200% of the total thickness of the rubber plate. Was generated. This was carried out for 4 cycles. The relationship between load and displacement at this time is shown in FIG.

(6) Similarly, in a state where a 10 MPa vertical load is applied to the pressure-receiving surfaces at both ends of the laminated rubber bearing body with tin plug, a shearing force is applied to give a shear strain of ± 250% of the total thickness of the rubber plate. Was generated. This was carried out for 4 cycles. FIG. 8 shows the relationship between load and displacement at this time.

(7) A shear force of ± 100% of the total thickness of the rubber plate is generated by applying a shearing force to the laminated rubber bearing body with tin plug while applying a vertical load of 20 MPa to the pressure receiving surfaces at both ends. It was. This was carried out for 4 cycles. The relationship between load and displacement at this time is shown in FIG.

(8) The laminated rubber bearing body with tin plug subjected to the force of (7) above was used as a test body and tested again under the following conditions. That is, a shearing force of ± 100% of the total thickness of the rubber plate was generated by applying a shearing force to the test body in a state where a vertical load of 10 MPa was applied to the pressure receiving surfaces at both ends. This was carried out for 4 cycles. The relationship between load and displacement at this time is shown in FIG.

(9) As a reference example, in a state where a vertical load of 10 MPa is applied to the pressure-receiving surfaces at both ends of the laminated rubber bearing body with lead plugs, a shearing force is applied and a shear of ± 100% of the total thickness of the rubber plate Strain was generated. This was carried out for 4 cycles. The relationship between load and displacement at this time is shown in FIG.

[Consideration of each test]
The load / displacement relationship shown in FIGS. 4 to 8 shows a shape in which the load near the zero displacement point is reduced. The load / displacement relationships shown in FIGS. 3, 9, 10, and 11 show a linear shape without a load drop even near the zero displacement point. The fact that the load does not decrease even when the load / displacement relationship is near the zero displacement point and shows a linear shape is considered to have stable seismic isolation characteristics.

According to the above tests (1) to (6), when a 10 MPa vertical load similar to that of a conventional laminated rubber bearing body with a lead plug is applied to the pressure receiving surface of the laminated rubber bearing body, the shear strain It can be seen that the seismic isolation characteristics are not stable even if the size of the is changed.
According to the tests of (7) and (8) above, when a shear force was applied in a state where a vertical load equivalent to 20 MPa was applied after the tin plug was inserted, the load decreased even when the load / displacement relationship was near zero displacement. It can be seen that it shows no stable shape. That is, in a state where a vertical load of 10 MPa is applied to the pressure-receiving surfaces at both ends of the laminated rubber bearing body with tin plug, there is almost no effect even if a shear force is applied, and the load near the zero displacement point is reduced. On the other hand, by applying a predetermined shear force in a state where a vertical load of 20 MPa is applied, the seismic isolation characteristics of the laminated rubber bearing body with a lead plug as shown in FIG. It can be seen that a laminated rubber bearing body having equivalent good seismic isolation characteristics can be obtained. Moreover, it can be seen from the test of (8) that by applying a shear force once a predetermined vertical load is applied, it has good seismic isolation characteristics even in a state where the vertical load is reduced later.

  From the above, it is apparent that manufacturing conditions different from the conventional manufacturing method are necessary to manufacture a laminated rubber bearing using a tin plug instead of a lead plug. Similarly, a laminated rubber bearing having stable seismic isolation performance can be produced by applying the production conditions of the present invention to copper, aluminum, and zinc, which have a larger elastic modulus and tensile force than lead.

It is a longitudinal cross-sectional view which shows a laminated rubber support body. It is a perspective view which shows a laminated rubber support body. It is a characteristic view showing a load / displacement relationship when 10 MPa pressure and ± 25% shear strain are applied to a laminated rubber bearing body with a tin plug. It is a characteristic view which shows a load and a displacement relationship when 10 MPa pressurization and the shear strain of +/- 50% are provided to the laminated rubber bearing body containing a tin plug. It is a characteristic view which shows a load and a displacement relationship when 10 MPa pressurization and the shear strain of +/- 100% are provided to the laminated rubber bearing body containing a tin plug. It is a characteristic view showing a load-displacement relationship when a 10 MPa pressure and ± 150% shear strain are applied to a laminated rubber bearing body with a tin plug. It is a characteristic view which shows a load and a displacement relationship when 10 MPa pressurization and the shear strain of +/- 200% are provided to the laminated rubber bearing body containing a tin plug. It is a characteristic view showing a load / displacement relationship when 10 MPa pressure and ± 250% shear strain are applied to a laminated rubber bearing body with a tin plug. It is a characteristic view which shows a load and a displacement relationship when 20 MPa pressurization and the shear strain of +/- 100% are provided to the laminated rubber bearing body containing a tin plug. FIG. 6 is a characteristic diagram showing a load / displacement relationship when a laminated rubber bearing body with a tin plug is subjected to a pressure of 10 MPa and a shear strain of ± 100% after applying a pressure of 20 MPa. It is a characteristic view which shows a load and a displacement relationship when 10 MPa pressurization and the shear strain of +/- 100% are provided to the laminated rubber bearing body containing a lead plug.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Laminated body 11 Rubber plate 12 Metal plate 13 Through-hole 14 Metal plug 17, 18 Flange bracket

Claims (6)

In a laminate formed by alternately laminating a plurality of rubber plates and a plurality of metal plates in the vertical direction, at least one through hole is formed in the vertical direction,
A lead-free metal plug is inserted into the through-hole at a pressure of at least 100 MPa,
Thereafter, in a state where a pressure of at least 15 MPa is applied to the pressure-receiving surface of the laminate in which the lead-free metal plug is inserted, the laminate is subjected to shear strain in a range of 25 to 250% of the total thickness of the plurality of rubber plates. A method for producing a laminated rubber bearing, comprising adding In a laminate formed by alternately laminating a plurality of rubber plates and a plurality of metal plates in the vertical direction, at least one through hole is formed in the vertical direction,
A lead-free metal plug is inserted into the through-hole at a pressure of at least 100 MPa,
Thereafter, in a state where a pressure of at least 20 MPa is applied to the pressure-receiving surface of the laminated body in which the lead-free metal plug is inserted, a shear strain in the range of 25 to 250% of the total thickness of the plurality of rubber plates is applied to the laminated body. A method for producing a laminated rubber bearing, comprising adding In a laminate formed by alternately laminating a plurality of rubber plates and a plurality of metal plates in the vertical direction, at least one through hole is formed in the vertical direction,
A lead-free metal plug is inserted into the through-hole at a pressure of at least 100 MPa,
Then, in a state where a pressure of at least 30 MPa is applied to the pressure-receiving surface of the laminated body in which the lead-free metal plug is inserted, a shear strain in the range of 25 to 250% of the total thickness of the plurality of rubber plates is applied to the laminated body. A method for producing a laminated rubber bearing, comprising adding In the manufacturing method of the laminated rubber bearing body in any one of Claims 1 thru | or 3,
A method for producing a laminated rubber bearing, wherein the lead-free metal plug is inserted into the through-hole with a pressure of at least 200 MPa. In the manufacturing method of the laminated rubber bearing body in any one of Claims 1 thru | or 4,
The method for producing a laminated rubber bearing body, wherein the non-lead metal plug is made of at least one selected from tin, copper, aluminum, zinc, and alloys thereof. In a laminate formed by alternately laminating a plurality of rubber plates and a plurality of metal plates in the vertical direction, at least one through hole is formed in the vertical direction,
A lead-free metal plug is inserted into the through-hole at a pressure of at least 100 MPa,
Then, in a state where a pressure larger than the actual support load is applied to the pressure-receiving surface of the laminated body in which the lead-free metal plug is inserted, the laminated body has a thickness of 25 to 250% of the total thickness of the plurality of rubber plates. A method for producing a laminated rubber bearing, characterized by applying a shear strain within a range.

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