JP2546071Y2 - Bridge girder damping device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper for a bridge girder, and more particularly to an improvement in a device for restricting movement of a bridge girder in a direction perpendicular to the axis of the bridge girder.

[0002]

2. Description of the Related Art In recent years, seismic force transmitted from the ground to a bridge girder via an abutment and a pier, that is, a seismic isolation device represented by a laminated rubber type has been installed between the pier and the girder for the purpose of reducing lateral shaking. It has been proposed to. By the way, in a bridge having a structure in which this type of seismic isolation device is interposed, a stopper is provided to restrict movement in a direction perpendicular to the bridge axis.

FIG. 3 shows two examples of a conventional stopper structure. In the example shown in FIG. 1A, a plurality of laminated rubber type seismic isolation devices 4 are interposed between a girder receiving portion 2 provided on a pier 1 and a bridge girder 3. At both ends in the width direction of the girder receiving portion 2, a pair of stoppers 5 are provided so as to project integrally with the girder receiving portion 2, and a slide plate 6 is fixed to a portion where the bridge girder 3 and each stopper 5 face each other. Has been established. In this structure,
In a state where the slide plates 6 are in contact with each other, the movement of the stopper 5 in the direction orthogonal to the bridge axis is restricted.

In the example shown in FIG. 3B, a stopper 7 is provided on the outer periphery of each seismic isolation device 4. In the example shown in the drawing, the tip of the stopper 7 abuts on the mounting plate on the bridge girder 3 side of the seismic isolation device 4, thereby restricting the movement in the direction orthogonal to the bridge axis. However, such a conventional stopper structure has a technical problem described below.

[0005]

That is, in the stopper structure shown in FIG. 3, when seismic force or the like is applied, there is almost no parallel movement as it is, and a load acts in an oblique direction. Since the slide plates 6 and the stopper 7 and the mounting plate compete with each other, there is a problem that both of them hinder the movement of the bridge girder 3 in the axial direction. In addition, the appearance becomes unsightly.

This invention is intended to solve the above-mentioned problems. It is an object of the invention to provide a bridge girder vibration damping device which can smoothly move in the axial direction of a bridge girder and which is excellent in appearance. It is in.

[0007]

In order to achieve the above object, the present invention provides a bridge provided with a seismic isolation device between a pier and a bridge girder, a recess provided at the center in the width direction of the bridge girder,
A support member protruding from the pier corresponding to the recess;
One end in the width direction side surface of the support member is fixed, Bei a pair of cushioning stopper the other end in sliding contact with the inner surface of the recess
The shock-absorbing stopper is mounted on the support member.
A plate, a sliding plate slidably contacting the inner surface of the recess, and the mounting plate
Between the rubber plate and the metal plate
And a laminated rubber type cushioning member which is alternately laminated .

[0008]

[0009]

[Effects of the Invention] According to the above configuration, it is possible to prevent
When seismic force acts from an oblique direction,
The cushioning member is compared with the lamination direction (the direction orthogonal to the bridge axis).
Easy to deform in the shear direction (bridge axis direction), reducing seismic force
It can be converted smoothly to the bridge axis direction while declining
Wear. Since the sliding plate slides on the inner surface of the recess,
It is possible to increase the allowable movement amount for any axis.
Also, since one end of the buffer stopper is in sliding contact with the side surface of the concave portion provided at the center of the bridge girder, movement in the bridge axis direction can be performed smoothly. In addition, the support member of the buffer stopper supports the load regardless of the movement in the width direction of the bridge girder in either the left or right direction. If there is. Furthermore, since the buffer stopper and the like are provided at the center of the bridge girder, the appearance of the bridge is not impaired.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings. In the following description, the same or corresponding parts as those in the above-described conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted. 1 and 2 show an embodiment of a bridge girder vibration damping device according to the present invention. The bridge shown in the figure has a plurality of laminated rubber-type seismic isolation devices 4 installed between the upper surface of the girder receiving portion 2 and the lower surface of the bridge girder 3, and the seismic isolation device 4 supports the load of the bridge girder 3. doing.

At the center of the bridge girder 3 in the width direction, a notched concave portion 10 is formed, and a metal plate 12 such as stainless steel is adhered to the inner surface of the concave portion 10. A support member 14 having a lower end buried in the girder receiving portion 2 corresponding to the concave portion 10 protrudes from the girder receiving portion 2. The distal end side of the support member 14 is located in the recess 10, and a pair of buffer stoppers 16 are attached to both side surfaces thereof.

FIG. 2 shows details of the buffer stopper 16. The cushioning stopper 16 shown in FIG. 1 includes a mounting plate 18 fixed to the support member 14 side, a sliding plate 20 made of Teflon resin or the like which slides on the metal plate 12 adhered to the inner surface of the concave portion 10, It comprises a buffer member 22 sandwiched between the plate 18 and the sliding plate 20.

The shock-absorbing member 22 is formed by laminating a thin rubber plate 22a and a metal plate 22b and bonding them alternately, and has the same basic configuration as the laminated rubber type seismic isolation device 4. In the vibration damping device configured as described above, when moving in the direction orthogonal to the bridge axis, the rubber plate 22a is elastically deformed up to the elastic limit of the buffer member 22, and the movement is allowed. When the elastic limit of the cushioning member 22 is exceeded, the bridge girder 3
Is regulated by the support member 14.

At this time, the support member 14 of the present invention is a bridge girder 3
In this case, since the load is supported in either of the left and right directions with respect to the movement in the width direction, the cross-sectional area of the stopper 5 shown in FIG. That is, in the stopper 5 of FIG. 3, since the bridge girder 3 is provided on both sides of the bridge girder, when the bridge girder 3 moves, one of the stoppers 5 supports the load. However, the supporting member 14 of the present invention only needs to have the same cross-sectional area as one of the stoppers 5.

On the other hand, the bridge girder 3 can be moved in the axial direction smoothly because the sliding plate 22 of the buffer stopper 16 is in sliding contact with the metal plate 12 of the concave portion 10 provided at the center of the bridge girder 3. . Further, since the buffer stopper 16 and the like are provided at the center of the bridge girder 3, the appearance of the bridge is not impaired.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a damper for a bridge girder according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a side view of a conventional bridge girder damping device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bridge pier 2 girder receiving part 3 bridge girder 4 seismic isolation device 10 recess 12 metal plate 14 support member 16 buffer stopper

Claims (1)

(57) [Scope of request for utility model registration] 1. A bridge provided with a seismic isolation device between a pier and a bridge girder, wherein a recess provided at the center in the width direction of the bridge girder, and a support member protruding from the pier corresponding to the recess. A pair of shock-absorbing stoppers, one end of which is fixed to the widthwise side surface of the support member, and the other end of which is in sliding contact with the inner side surface of the recess .
A mounting plate fixed to the support member;
And a sliding plate that is in sliding contact with the inner surface of the recess, and the mounting plate
Replaces multiple rubber plates and metal plates sandwiched between sliding plates.
A vibration damping device for a bridge girder, comprising a laminated rubber type cushioning member laminated on each other .