JP2005233205A - Vibration-isolation support system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-isolation support system preventing an outflow of a lead composition of a lead plug into an environment and preventing a deformation of each end face of the lead plug caused by motions of vibration-isolation. <P>SOLUTION: A rubber layer 3 and a reinforcing plate 4 are stacked in many stages between an upper mounting plate 1 and a lower mounting plate 2 in the vibration-isolation support system A, and an outer periphery of these laminated layers is covered by a rubber layer 3. A lower rubber pole 6 is buried into an inner part of a hole 5 with a bottom, a lead plug 7 is buried onto the lower rubber pole 6, and an entrance of the hole is sealed with an upper rubber pole 8 charged with a rubbery bonding agent 81. Thus, the outflow of a lead composition into an environment is surely prevented, and the deformation of each end face of the lead plug 7 caused by motions of vibration-isolation are also prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seismic isolation bearing device that seismically supports structures such as bridges, highways, and buildings.

Patent Document 1 discloses a laminated rubber body in which a lead plug is enclosed.
Patent Document 2 discloses a lead-filled laminated rubber bearing in which a shape-retaining portion made of a Sn—Pb alloy, Cu, or Sn metal is disposed at upper and lower ends.
Patent Document 3 discloses a seismic isolation bearing device in which a key member is fitted on the upper side and the lower side of a lead column.
JP-A-8-326812 JP-A-8-21484 JP-A-11-148534

  Since the end face of the lead plug is exposed in the laminated rubber body described in Patent Document 1, the lead component of the lead plug is caused by intrusion of water (rain water, snow, fog, condensation, ice, etc.) when used for a long time. It melts to the outside through the gap between the upper reinforcing plate and the upper surface plate and the gap between the lower reinforcing plate and the lower surface plate, and pollutes the earth environment such as soil, rivers and sea.

  In the lead-filled laminated rubber bearing described in Patent Document 2, the gap between the shape retaining portion and the plug embedding hole formed by the corrosion of the shape retaining portion, and the shape retaining portion and plug embedding generated when supporting the shaking Water such as rainwater enters the lead plug through the gap between the holes, and the dissolved lead component flows out.

  In the seismic isolation bearing device described in Patent Document 3, water such as rainwater enters the lead strut from the gap formed by corrosion of the mounting member and the key member, or the gap generated when supporting the shaking, and the dissolved lead component is It flows out to the outside.

  An object of the present invention is to provide a seismic isolation bearing device that can prevent the lead component of the lead plug from flowing into the environment and that prevents deformation of each end face of the lead plug due to the seismic isolation operation.

[About claim 1]
The pillar-shaped laminate is laminated between the upper mounting plate and the lower mounting plate that face each other, with the rubber layer and the reinforcing plate stacked in multiple stages so that the rubber layer is on the upper and lower sides. Covered with a rubber layer. This laminated body is provided with a bottomed hole having a circular cross section having an opening in the upper mounting plate in the vertical direction. The bottom of the bottomed hole is a recess formed in the lower mounting plate.

A cylindrical lower rubber column, a lead plug, and an upper rubber column are embedded in the bottomed hole. The lower rubber column is embedded in the bottom of the bottomed hole.
The lead plug is embedded in the bottomed hole above the lower rubber pillar. The length of the lead plug is set as follows: bottomed hole length−upper rubber column length−lower rubber column length.
The upper rubber pillar is embedded in a bottomed hole above the lead plug, and seals the inlet of the bottomed hole.

[About claim 2]
The laminated body is a cylinder, a cube, or a rectangular parallelepiped, and the number of bottomed holes is 1 to 5.

[About claim 3]
In order to improve the sealing performance, a rubber-based adhesive is applied to the outer peripheral surface, and the upper rubber column is embedded in the inlet of the bottomed hole.

[About claim 1]
Since the lower rubber column, the lead plug, and the upper rubber column are embedded in the bottomed hole and the inlet is sealed with the upper rubber column located on the lead plug, rainwater or the like does not enter the periphery of the lead plug. For this reason, the outflow of the lead component to the environment can be prevented.

  The lead plug is sandwiched between a lower rubber column embedded in the bottom of the bottomed hole and an upper rubber column sealing the inlet of the bottomed hole. For this reason, even if each end surface of the lead plug collides with the rubber column during the seismic isolation operation, the rubber column is recessed and the impact received by the lead plug is absorbed, so that deformation of each end surface of the lead plug can be prevented.

[About claim 2]
A laminated body is a cylinder, a cube, or a rectangular parallelepiped. There are one to five bottomed holes.
When the number of the bottomed holes is one, the laminated body is a cylinder or a cube, and the bottomed hole is formed at the center axis position of the cylinder or the cube.

When there are two bottomed holes, the laminated body is formed into a columnar or rectangular parallelepiped, and each bottomed hole is formed at an equal distance from the central axis of the columnar or rectangular parallelepiped.
When there are three bottomed holes, the laminated body is a rectangular parallelepiped, one bottomed hole is formed at the central axis position of the rectangular parallelepiped, and the remaining two bottomed holes are formed at an equal distance from the central axis.

When there are four bottomed holes, the stacked body is a rectangular parallelepiped, and a slightly smaller rectangular parallelepiped having the same central axis as this rectangular parallelepiped is assumed. Create a hole.
When there are five bottomed holes, the stacked body is a rectangular parallelepiped, and a slightly smaller rectangular parallelepiped having the same central axis as this rectangular parallelepiped is assumed, and four bottomed holes are formed along the thickness direction side of the virtual rectangular parallelepiped. A hole is formed, and the remaining bottomed hole is formed at the central axis position.

[About claim 3]
A rubber adhesive is applied to the outer peripheral surface, and an upper rubber column is embedded at the entrance of the bottomed hole.
For this reason, a gap does not occur between the bottomed hole of the upper mounting plate and the upper rubber column regardless of the stationary state or the seismic isolation operation, and the inlet of the bottomed hole can be completely sealed.
Therefore, it is possible to prevent rainwater and the like from entering the periphery of the lead plug, and to reliably prevent the lead component from flowing out into the environment.

The seismic isolation bearing device has a rubber layer and a reinforcing plate laminated in multiple layers between the upper mounting plate and the lower mounting plate, and the outer periphery is covered with a rubber layer to form a laminated body, behind the bottomed hole. The lower rubber pillar is embedded, a lead plug is embedded in the bottomed hole above the lower rubber pillar, and the inlet of the bottomed hole is sealed with the upper rubber pillar coated with rubber adhesive on the outer peripheral surface. Yes.
As a result, it is possible to prevent the lead component of the lead plug from flowing out to the environment, and it is possible to prevent deformation of each end face of the lead plug accompanying the seismic isolation operation.

Example 1 (corresponding to claims 1 to 3) of the present invention will be described with reference to FIGS.
The seismic isolation bearing device A shown in FIG. 1 has a rubber layer 3 and a reinforcing plate 4 laminated between an upper mounting plate 1 and a lower mounting plate 2, and the outer periphery is covered with a rubber layer 3. A lower rubber column 6, a lead plug 7, and an upper rubber column 8 are embedded in the bottomed hole 5.

The upper and lower mounting plates 1 and 2 are formed of thick steel (rectangular cross section), and a plurality of screw holes n for bolting are formed. A circular recess m is formed in the upper and lower mounting plates 1 and 2.
On the outer edge of the upper surface 11 of the upper mounting plate 1, a step portion 12 for fitting the bent portion 31 of the rubber layer 3 is formed in a rectangular shape. Further, a step portion 22 for fitting the bent portion 32 of the rubber layer 3 is formed in a rectangular shape on the outer edge of the lower surface 21 of the lower mounting plate 2.

The rubber layer 3 is a rubber composition having high damping characteristics, and is manufactured by adding carbon black as an additive for imparting high damping to natural rubber, which is a rubber material.
In addition, the reinforcing plate 4 is made of steel that is thinner than the upper and lower mounting plates 1 and 2.

  As the rubber material of the rubber layer 3, butadiene rubber, isoprene rubber, butyl rubber, or the like can be used in addition to natural rubber. Moreover, silica, resin, etc. can be used for an additive other than carbon black.

  The rubber layer 3 is provided between the upper mounting plate 1 and the first reinforcing plate 4, between the first reinforcing plate 4 and the second reinforcing plate 4, and between the second reinforcing plate 4 and the third reinforcing plate. 4, between the third reinforcing plate 4 and the lower mounting plate 2, and on the outer periphery of the laminate including the bent portions 31 and 32.

The bottomed hole 5 is a hole having a circular cross section having a bottom formed in a vertical direction of a rectangular parallelepiped (corresponding to a laminated body) including the upper and lower mounting plates 1 and 2, the rubber layer 3, and the reinforcing plate 4. Four bottomed holes 5 are formed along the side in the thickness direction of a virtual rectangular parallelepiped that is slightly smaller and has the same central axis as the rectangular parallelepiped.
The bottomed hole 5 has an opening in the upper mounting plate 1, and the bottom surface of the recess 23 formed in the lower mounting plate 2 is the hole bottom.

  The lower rubber pillar 6 has a height that is about ½ of the thickness of the lower mounting plate 2 (embedded state), is press-fitted into the bottomed hole 5 from the hole inlet, and is embedded in the hole bottom. .

The lead plug 7 is press-fitted into the bottomed hole 5 after the lower rubber pillar 6 is buried in the bottom of the hole, and is buried in the bottomed hole 5 in a restrained state. In the present embodiment, the lead plug 7 is made of pure lead that is highly malleable and easily plastically deformed.
The lead plug 7 may be lead (Pb), tin (Sn), antimony (Sb), or a lead alloy made by adding tin and antimony in addition to pure lead.

The upper rubber column 8 has a height that is about ½ of the thickness of the upper mounting plate 1 (embedded state), and seals the hole entrance of the bottomed hole 5. When the upper rubber column 8 is press-fitted into the bottomed hole 5 from the hole entrance, a rubber-based adhesive 81 is applied to the outer peripheral surface.
Further, the material of the lower rubber column 6 and the upper rubber column 8 is formed of the same material as the rubber material of the rubber layer 3.

  Lower rubber so that the length of the lower rubber column 6 (embedded state) + the length of the lead plug 7 + the length of the upper rubber column 8 (embedded state) is exactly equal to the hole length of the bottomed hole 5. The length of each member of the pillar 6, the lead plug 7, and the upper rubber pillar 8 is set.

  As shown in FIG. 2, the seismic isolation bearing device A according to the first embodiment is disposed between an upper structure 10 such as a bridge girder and a lower structure 20 such as a bridge pier, and the upper structure 10 is seismically isolated. To do.

When the seismic isolation bearing device A of Example 1 is disposed between the upper structure 10 such as a bridge girder and the lower structure 20 such as a bridge pier, the following advantages are obtained.
[A] Since the lower rubber column 6, the lead plug 7, and the upper rubber column 8 are embedded in the bottomed hole 5, and the upper rubber column 8 located on the lead plug 7 seals the hole inlet, Rainwater does not enter the area around the plug 7.
For this reason, the outflow of the lead component to the environment can be prevented over a long period (several decades or more).

[A] The lead plug 7 is sandwiched between a lower rubber column 6 embedded in the bottom of the bottomed hole 5 and an upper rubber column 8 that seals the inlet of the bottomed hole 5. For this reason, even if each end surface of the lead plug 7 collides with each rubber column during the seismic isolation operation, the rubber column is recessed and the impact received by the lead plug 7 is absorbed, so that each end surface of the lead plug 7 is deformed. It can be prevented.

[C] A rubber-based adhesive 81 is applied to the outer peripheral surface, and the upper rubber column 8 is embedded in the inlet of the bottomed hole 5.
For this reason, a gap does not occur between the bottomed hole 5 of the upper mounting plate 1 and the upper rubber column 8 regardless of whether it is stationary or seismically isolated, and the inlet of the bottomed hole 5 can be completely sealed. .
Accordingly, it is possible to prevent rainwater and the like from entering the periphery of the lead plug 7 and reliably prevent the lead component from flowing out into the environment.

Next, a second embodiment (corresponding to claims 1 to 3) of the present invention will be described with reference to FIG.
The seismic isolation bearing device B shown in FIG. 3 has a rubber layer 3 and a reinforcing plate 4 laminated between an upper mounting plate 1 and a lower mounting plate 2, and the outer periphery is covered with a rubber layer 3. A lower rubber column 6, a lead plug 7, and an upper rubber column 8 are embedded in the bottomed hole 5. The circular recess m is not formed in the upper and lower mounting plates 1 and 2.

In the seismic isolation bearing device B of the second embodiment, the four bottomed holes 5 are formed along the side in the thickness direction of the virtual rectangular parallelepiped having the same central axis as the rectangular parallelepiped, and the remaining one bottomed hole 5 is formed. Is formed at the center axis position. Other configurations are the same as those of the seismic isolation bearing device A of the first embodiment.
The seismic isolation bearing device B of Example 2 also has the advantages according to the above [A] to [C].

Next, a third embodiment (corresponding to claims 1 to 3) of the present invention will be described with reference to FIG.
The seismic isolation bearing device C shown in FIG. 4 has a rubber layer 3 and a reinforcing plate 4 laminated between an upper mounting plate 1 and a lower mounting plate 2, and the outer periphery is covered with the rubber layer 3. A lower rubber pillar 6, a lead plug 7 and an upper rubber pillar 8 are embedded in the bottom hole 5. In addition, the bottomed hole 5 is formed in the central-axis position of a cylindrical laminated body.
This seismic isolation bearing device C is disposed between the upper structural member 13 and the lower structural member 24, and seismically isolates the upper structural member 13.

The upper and lower mounting plates 1 and 2 are made of thick steel (circular cross section).
A step portion 12 for fitting the bent portion 31 of the rubber layer 3 is formed in a circular shape on the outer edge of the upper surface 11 of the upper mounting plate 1. Further, a step portion 22 for fitting the bent portion 32 of the rubber layer 3 is formed in a circular shape on the outer edge of the lower surface 21 of the lower mounting plate 2.
The seismic isolation bearing device C of Example 3 also has the advantages according to the above [A] to [C].

Next, a fourth embodiment (corresponding to claims 1 to 3) of the present invention will be described with reference to FIG.
The seismic isolation bearing device D shown in FIG. 5 has a rubber layer 3 and a reinforcing plate 4 laminated between an upper mounting plate 1 and a lower mounting plate 2, and the outer periphery is covered with a rubber layer 3. A lower rubber column 6, a lead plug 7, and an upper rubber column 8 are embedded in the bottomed hole 5. In addition, the bottomed holes 5 and 5 are formed in the same position from the center axis | shaft of a cylindrical laminated body, and the position which pinches | interposes a center axis.

The seismic isolation bearing device D is disposed between the upper structural member 13 and the lower structural member 24, and seismically isolates the upper structural member 13.
The seismic isolation bearing device D of Example 4 also has the advantages according to the above [A] to [C].

It is explanatory drawing which shows the structure of the seismic isolation bearing apparatus which concerns on Example 1. FIG. It is sectional drawing which shows the state which has arrange | positioned the seismic isolation bearing apparatus between the upper structure and the lower structure. It is explanatory drawing which shows the structure of the seismic isolation bearing apparatus which concerns on Example 2. FIG. It is explanatory drawing which shows the structure of the seismic isolation bearing apparatus which concerns on Example 3. FIG. It is explanatory drawing which shows the structure of the seismic isolation bearing apparatus which concerns on Example 4. FIG.

Explanation of symbols

A, B, C, D Seismic isolation bearing device 1 Upper mounting plate 2 Lower mounting plate 3 Rubber layer 4 Reinforcement plate 5 Bottomed hole 6 Lower rubber pillar 7 Lead plug 8 Upper rubber pillar 23 Recess 81 Adhesive

Claims (3)

The rubber layer and the reinforcing plate are laminated in multiple stages so that the rubber layers are on the upper and lower sides between the upper and lower mounting plates arranged opposite to each other, and the outer periphery is covered with the rubber layer. And a columnar laminate in which the bottom mounting hole having an opening in the upper mounting plate is provided in the vertical direction;
A columnar lead plug embedded in the bottomed hole, and a seismic isolation bearing device in which a recess is formed in the lower mounting plate to form a bottom of the bottomed hole,
A seismic isolation bearing device characterized in that a cylindrical lower rubber column is embedded in the bottom of the bottomed hole, and an inlet of the bottomed hole is sealed with a cylindrical upper rubber column. 2. The seismic isolation bearing device according to claim 1, wherein the laminated body is a cylinder, a cube, or a rectangular parallelepiped, and the number of the bottomed holes is one to five. 3. The seismic isolation bearing device according to claim 1, wherein the upper rubber column is embedded in an inlet of the bottomed hole by applying a rubber-based adhesive on an outer peripheral surface. 4.