JP3124502B2 - Structure of leaded rubber bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a laminated rubber bearing containing lead, and more particularly, to a structure in which a lead plug is sealed in a laminated rubber body to support a load and to reduce vibration energy such as an earthquake. The present invention relates to a structure of a seismic isolation bearing device that absorbs by utilizing shear deformation of a floor.

[0002]

2. Description of the Related Art Conventionally, a lead-containing laminated rubber bearing in which a lead plug is sealed in a laminated rubber body in which a rubber layer and a reinforcing plate are alternately laminated in the vertical direction, has a function of reducing vibration energy during an earthquake. It is widely known as an absorbing and damping seismic isolation bearing device. The lead plugs used in this laminated rubber bearing exhibit energy absorption characteristics due to shear deformation accompanying horizontal deformation of the laminated rubber body when the upper structure and lower structure cause relative displacement during an earthquake. It is.

However, when the laminated rubber bearing is repeatedly subjected to shear deformation, the reinforcing plate, usually made of steel plate, in the laminated rubber main body bites into the lead plug, the lead plug itself bites into the rubber layer, and furthermore, the lead plug is partially localized. Harmful deformation such as deformation may occur. As a result, the desired energy absorption characteristics may not be obtained.

[0004]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects.

SUMMARY OF THE INVENTION An object of the present invention is to prevent the above-mentioned stiffening plate from biting into the lead plug , biting into the rubber layer of the lead plug, and preventing harmful deformation such as local deformation of the lead plug from occurring. It is an object of the present invention to provide a structure of a lead-containing laminated rubber bearing capable of obtaining desired energy absorption characteristics over a wide range.

[0006]

The present invention employs the following means to achieve the above object.

That is, according to the present invention, a lead plug (7) is provided inside a laminated rubber body (6) in which a rubber layer (9) and reinforcing plates (10, 11, 12) are alternately laminated in the vertical direction. in sealed vertically leaded laminated rubber bearing, before
The lead plug (7) is sealed in the laminated rubber body (6).
Forming a hole (14) having a larger diameter than the sealing hole (8) for
In the inner periphery of the hole (14), the sealing of the lead plug (7) is performed.
An inlet hole (8) is defined and a coil spring (1
3) A hollow cylindrical rubber body in which a restraining member consisting of 3) is embedded.
(30) is a structure of a lead-containing laminated rubber bearing characterized by being vulcanized and bonded .

[0008]

The laminated rubber bearing is installed between the upper structure and the lower structure, and the load of the upper structure is transmitted to the lower structure via the laminated rubber body. When an oscillating force is applied to the lower structure during an earthquake, the upper and lower structures are relatively displaced in the horizontal direction, and the laminated rubber body undergoes elastic shear deformation. Is transmitted to the upper structure by prolonging the period, and performs seismic isolation.
On the other hand, the lead plug also undergoes plastic shear deformation along with the shear deformation of the laminated rubber main body, and absorbs vibration energy by the plastic deformation to perform a damping action.

According to the present invention, when the laminated rubber body is sheared as described above, the restraining member is also deformed in the horizontal direction following the shear deformation, and the lead plug is constantly restrained by the restraining member surrounding the lead plug. Therefore, even if the laminated rubber bearing is repeatedly subjected to shear deformation, it is possible to prevent the reinforcing plate from biting into the lead plug and the lead plug itself from biting into the rubber layer.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the structure of a lead-containing laminated rubber bearing according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. The laminated rubber bearing 1 is installed between the upper structure 4 and the lower structure 5 via the upper mounting plate 2 and the lower mounting plate 3. Here, the lower structure 5 is, for example, a concrete foundation constructed on the ground, and the upper structure 4 is a middle-to-high-rise building.

The laminated rubber bearing 1 has a laminated rubber body 6 having a columnar shape as a whole, and a circular sealing hole 8 for sealing a lead plug 7 is formed in the center thereof . The laminated rubber body 6 is formed by alternately laminating an annular rubber layer 9 and a reinforcing plate, that is, thick upper and lower reinforcing plates 10 and 11 and a thin intermediate reinforcing plate 12, and these rubber layers 9 and reinforcing members are reinforced. The plates 10, 11, and 12 are integrated by vulcanization bonding.
The reinforcing plates 10, 11, and 12 are members for restraining the swelling of the laminated rubber when the load of the upper structure 4 is received, thereby preventing the laminated rubber bearing 1 from being compressed and deformed.

A coil spring 13 is embedded in the rubber layer around the sealing hole 8 so as to surround the lead plug 7. This coil spring 13
Are installed without load in the tension and compression directions. The coil spring 13 is made of durable spring steel, but may be made of reinforced fiber.

The laminated rubber body 6 provided with the coil spring 13 is generally manufactured as follows. That is, an annular rubber layer 9 having an inner diameter larger than the sealing hole 8 and reinforcing plates 10, 11, and 12 are laminated in a molding die. As a result, a hole 14 having a larger diameter than the sealing hole 8 is formed at the center of the laminate. On the other hand, a hollow cylindrical rubber body 30 in which the coil spring 13 is embedded is separately molded, inserted into the hole 14 when the laminated rubber body 6 is molded, and vulcanized and bonded.

The lead plug 7 has a cylindrical shape, and is press-fitted into the sealing hole 8 of the laminated rubber body 6. At this time, since the rubber layer around the sealing hole 8 is restrained by the coil spring 13, the sealing hole 8 does not expand.

The upper and lower mounting plates 2 and 3 are made of a disk-shaped steel plate and have a bottomed boss hole 15 at the center. A bottomed boss hole 16 is also formed at the center of the upper and lower reinforcing plates 10 and 11 of the laminated rubber body 6, and a shear key 17 is fitted into these boss holes 15 and 16. The upper and lower reinforcing plates 10 and 11 are provided with a plurality of bolt holes 18.
The laminated rubber main body 6 and the upper and lower mounting plates 2 and 3 are integrally connected by mounting bolts 19 screwed to the mounting member 8. A plurality of bolt holes 20 are formed in the upper and lower mounting plates 2, 3, and the upper and lower mounting plates 2 are mounted on the upper and lower structures 4, 5 via anchor bolts 21 screwed into these bolt holes 20. Can be

Next, the operation of the lead-containing laminated rubber bearing 1 will be described with reference to FIG. The load of the upper structure 4 is transmitted to the lower structure 5 via the laminated rubber body 6. When the vibration force F is input to the lower structure 5 during an earthquake, the upper and lower structures 4, 5 are relatively displaced in the horizontal direction, and the laminated rubber body 6 undergoes elastic shear deformation. Due to its elastic characteristics, the input period is lengthened and transmitted to the upper structure 4 to perform seismic isolation. On the other hand, the lead plug 7 also undergoes plastic shear deformation along with the shear deformation of the laminated rubber main body 6, and absorbs vibration energy by the plastic deformation to perform a damping action.

During the above-described shear deformation of the laminated rubber main body 6, the coil spring 13 also deforms in the horizontal direction following the shear deformation. At this time, the coil spring 13
Elongates in synchronism with the horizontal elongation of the laminated rubber body 6,
As a result, the coil spring 13 always surrounds the lead plug 7 over its entire length. That is, the lead plug 7 is always constrained by the coil spring 13, so that even if the laminated rubber bearing 1 is repeatedly subjected to shear deformation, the reinforcing plates 10, 11, 12
Of the lead plug 7 and the rubber layer of the lead plug 7 itself are prevented.

Further, during the shear deformation of the laminated rubber body 6, the coil spring 13 transmits the horizontal force caused by the horizontal movement of the intermediate reinforcing plate 12 to the lead plug 7 evenly in the longitudinal direction. Therefore, harmful deformation such as local deformation can be prevented from occurring in the lead plug 7. From the above, the laminated rubber bearing 1 exhibits the expected energy characteristics even if it is repeatedly subjected to a shearing action for a long period of time.

FIG. 4 is a vertical sectional view showing another embodiment.
5 is a sectional view taken along line B-B of FIG. In this embodiment, the laminated rubber main body 6 is formed in a quadrangular prism shape as a whole, and a plurality of lead plugs 7 are formed.
Is provided. A coil spring 13 is embedded in a rubber layer around each lead plug 7. In addition, the same reference numerals are given to the same members as those in the above embodiment, and the description is omitted. The lead-containing laminated rubber bearing 1 of this embodiment is:
For example, the superstructure is used for supporting a bridge which is a bridge girder and the lower structure is a pier or an abutment.

[0021]

As described above, according to the present invention, even if the laminated rubber bearing is repeatedly subjected to shear deformation, the reinforcing plate does not bite into the lead plug, the lead plug bites into the rubber layer,
It is possible to prevent harmful deformation such as local deformation of the lead plug from occurring, and to obtain desired energy absorption characteristics over a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is an operation explanatory view.

FIG. 4 is a longitudinal sectional view showing another embodiment.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lead-containing laminated rubber bearing 4 ... Upper structure 5 ... Lower structure 6 ... Laminated rubber main body 7 ... Lead plug 8 ... Enclosure hole 9 ... Rubber layer 10 ... Upper reinforcement plate 11 ... Lower reinforcement plate 12 ... Intermediate reinforcement plate 13 … Coil spring 17… Shear key

Claims (1)

(57) [Claims] 1. A rubber layer (9) and a reinforcing plate (10, 11, 1 ).
2) A laminated rubber body formed by alternately laminating in the vertical direction
In a lead-containing laminated rubber bearing in which a lead plug (7) is vertically enclosed in (6), the lead plug (7) is enclosed in the laminated rubber body (6).
Hole (14) larger in diameter than sealing hole (8)
The inner periphery of the hole (14) is located in front of the lead plug (7).
The sealing hole (8) is defined and a coil spring is
A hollow cylindrical gore in which a restraining member consisting of (13) is embedded
A structure of a lead-containing laminated rubber bearing, wherein a rubber body (30) is vulcanized and bonded .