JPH0716724Y2 - Seismic isolation support device for bridge girder - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention can prevent the bridge girder from largely moving horizontally when a large horizontal seismic force acts on the bridge girder, The present invention relates to a seismic isolation bearing device for a bridge girder that can effectively damp the vibration and inertial force of the bridge girder.

[Conventional technology]

Conventionally, as a support device for a bridge girder, an elastic support is interposed between the abutment and the end of the girder to fix the upper part of the elastic support to the bridge girder and the lower part of the elastic support to the abutment. A bearing device having the above structure is known.

[Problems to be solved by the device]

However, in the case of the conventional supporting device for the bridge girder, when a large horizontal seismic force is applied to the bridge girder, there is a problem that the bridge girder largely laterally moves and the bridge girder vibrates for a relatively long time due to a resonance phenomenon.

This invention provides a seismic isolation bearing device for a bridge girder that can suppress the lateral displacement of the bridge girder even if a large horizontal seismic force is applied to the bridge girder and that can prevent long-term vibration of the bridge girder due to a resonance phenomenon. That is the purpose.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the seismic isolation support device for a bridge girder of the present invention, the sliding plate 4 is fixed to one of the lower surface of the end of the bridge girder 1 or the girder rest 3 of the abutment 2 and the other. An elastic slide bearing 5 is fixed to the bridge girder 1, and the girder rest 3 supports the bridge girder 1 via the sliding plate 4 and the elastic slide bearing 5, and the underside of the end of the bridge girder 1 and the girder rest of the abutment 2 are supported. Three
And the horizontal force bearing elastic stopper 6 interposed between them.
Of the bridge girder support front face 7 and the bridge girder end face 8 which are fixed between the bridge girder support front face 7 and the bridge girder end face 8 of the abutment 2. Fixed to the front cushion bearing 9 and the front face 7
Alternatively, the side buffer bearings 12 provided between the bridge girder side surface 10 and the bridge girder side surface 11 in the abutment 2 are provided with a gap between the bridge girder end surface 8 and the other side. Alternatively, it is fixed to one of the side faces of the bridge girder 11, and a gap is provided between the side cushion support 12 and the other of the side face 10 or the side face of the girder 11.

The sliding plate 4 is fixed to one of the lower surface of the end of the bridge girder 1 or the girder mounting portion 3 of the abutment 2, and the elastic sliding bearing 5 having the sliding bearing 13 is fixed to the other, and the girder mounting is performed. The bridge girder 1 is supported by the mounting portion 3 via the slide plate 4 and the elastic slide bearing 5, and the horizontal force bearing elastic stopper composed of the rubber material 14 and the upper metal plate 15 and the lower metal plate 16 fixed to both upper and lower surfaces thereof. Reference numeral 6 denotes a front cushion bearing 9 which is interposed between and fixed to the lower surface of the end portion of the bridge girder 1 and the girder mounting portion 3 of the abutment 2 and is fixed to the bridge girder support front surface 7 of the abutment 2. Also, a gap is provided between the bridge girder end surface 8 and the side buffer bearing 12 fixed to the bridge girder supporting side surface 10 of the abutment 2 and the bridge girder side surface 11 to provide the above-mentioned structure. The purpose can be achieved.

[Action]

The bridge girder 1 is slidably supported by the girder mounting portion 3 of the abutment 2 via the sliding plate 4 and the elastic slide bearing 5, and with respect to a relatively small horizontal seismic force acting on the bridge girder 1, horizontal force bearing elasticity is provided. The stopper 6 elastically resists and suppresses the horizontal movement of the bridge girder 1 without applying a large horizontal force to the abutment 2.
In addition, when the bridge girder 1 tries to move largely horizontally due to a large horizontal seismic force, the bridge girder 1 will move to the bridge girder end face 8 or bridge girder side
The bridge girder 1 will not move largely horizontally as it hits 11 or both of them and is buffered. Further, the horizontal force bearing elastic stopper 6, the bridge girder end surface 8, and the bridge girder side surface 11
Due to and, vibration and inertial force of the bridge girder 1 at the time of earthquake are damped.

〔Example〕

 Next, the present invention will be described in detail with reference to the illustrated example.

FIGS. 7 and 8 show an example of the elastic slide bearing 5 used in the embodiment of the present invention, in which the central upper surface of a steel support plate 18 having a plurality of through holes 17 for inserting bolts is provided. Further, a large number of the rubber layers 19 and the steel plates 20 are alternately laminated and fixed, and a sliding bearing 13 made of tetrafluoroethylene is integrally fixed to the upper surface of the uppermost steel plate 20.

9 and 10 show an example of the horizontal force bearing elastic stopper 6 used in the embodiment of the present invention, in which the upper end surface of the cylindrical rubber member 14 is an upper metal plate made of a steel plate.
15 are integrally fixed, a lower metal plate 16 made of a steel plate is integrally fixed to the lower end surface of the cylindrical rubber material 14, and the lower end portions of a plurality of steel anchor rods 21 are provided on the upper surface of the upper metal plate 15. The lower metal plate 16 is fixed by welding, and further has a plurality of through holes 22 for inserting bolts.

11 to 13 show a first example of the buffer bearings 9 and 12 which can be used when the present invention is carried out, and a steel holding plate having a plurality of through holes 23 for inserting bolts. The rubber layer 25 is integrally fixed to the center surface of 24, and the rubber layer 25
A steel plate 26 is embedded and fixed in the middle portion and the surface side in the thickness direction, and a large number of through holes 27 are formed in the rubber layer 25.

FIGS. 14 and 15 show a second example of the buffer bearings 9 and 12 that can be used when the present invention is carried out, and a steel holding plate having a plurality of bolt insertion through holes 23. A rubber layer 25 is integrally fixed to the central surface of 24, and a large number of protrusions 28 are integrally connected to the surface side of the rubber layer 25.

1 to 4 relate to a first embodiment of the present invention using the elastic slide bearing 5, the horizontal force bearing elastic stopper 6, and the buffer bearings 9 and 12 shown in FIGS. 11 to 13. 1 shows a seismic isolation support device for a bridge girder, and a steel reinforcing plate 31 having anchor rods 30 fixed to the lower part of the end part of the bridge girder 1 and the lower part of the bridge girder 1 located above the pier 29, and A sliding plate 4 made of a stainless steel plate fixed to the lower surface of the reinforcing plate 31 is embedded, and the lower surface of the sliding plate 4 is arranged at substantially the same level as the lower surface of the bridge girder 1. Further, the sliding plate 4 and the abutment 2 and the pier are arranged. An elastic sliding bearing 5 is interposed between the girder mounting portion 3 of 29, and the steel support plate 18 of the elastic sliding bearing 5 is attached to the girder mounting portion 3 by an anchor bolt 32 via the sliding plate 4. It is supported so that it can slide.

The horizontal force bearing elastic stopper 6 is interposed between the girder placement portion 3 and the lower surface of the bridge girder 1 on the abutment 2 and the pier 29, and the anchor rod 21 fixed to the upper metal plate 15 in the horizontal force bearing elastic stopper 6 is provided. Is fixed to the bridge girder 1 and the lower metal plate 16 of the horizontal force bearing elastic stopper 6 is fixed to the girder mounting portion 3 by anchor bolts 33.

On the front surface 7 of the abutment 2 for supporting the piers, the front cushioning support 9 is provided.
The holding plate 24 in the abutment is abutted and fixed by the anchor bolt 34, and a gap is provided between the surface of the front buffer support 9 and the bridge girder end surface 8. The holding plate 24 of the partial buffer bearing 12 is abutted and fixed by the anchor bolt 34, and a gap is provided between the surface of the side buffer bearing 12 and the bridge girder side surface 11.

5 and 6 show a part of the seismic isolation support device for a bridge girder according to the second embodiment of the present invention, in which the bridge girder end face 8
The steel holding plate 24 of the front buffer support 9 is abutted on and fixed by the anchor bolts 34, and a gap is provided between the surface of the front buffer support 9 and the bridge girder support front face 7 of the abutment 2. And the holding plate 24 of the side buffer bearing 12 is abutted on the side surface 11 of the bridge girder and fixed by the anchor bolt 34, and between the surface of the side buffer bearing 12 and the side surface 10 of the abutment 2 for supporting the girder. Although a gap is provided in the first embodiment, the other structure is similar to that of the first embodiment.

In carrying out this invention, the sliding plate 4 is fixed to the girder mounting portion 3 of the abutment 2, and the support 18 of the elastic sliding bearing 5 is fixed to the lower part of the bridge girder 1 to allow the sliding of the elastic sliding bearing 5. The support 13 may be placed on the sliding plate 4.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

The bridge girder 1 is slidably supported via the sliding plate 4 and the elastic slide bearing 5, and the horizontal force bearing elastic stopper 6 elastically resists a relatively small horizontal seismic force acting on the bridge girder 1. , The horizontal movement of the bridge girder 1 can be suppressed without giving a large horizontal force to the abutment 2, and when the bridge girder 1 is about to move largely horizontally due to a large horizontal seismic force, the bridge girder 1 is moved to the front cushioning support. 9 or side buffer bearing 12
Or because it hits both of them and the buffer is stopped,
It is possible to prevent the bridge girder 1 from moving greatly horizontally,
Further, the horizontal force bearing elastic stopper 6 and the front cushion bearing body
9. The vibration and inertial force of the bridge girder 1 at the time of earthquake can be effectively damped by the side buffer bearings 12, and the long-term vibration of the bridge girder 1 due to the resonance phenomenon can be prevented.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention, and FIG. 1 is a plan view showing a seismic isolation bearing device for a bridge girder,
2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is B of FIG.
-B line enlarged sectional view, FIG. 4 is an enlarged vertical side view showing a part of the seismic isolation bearing device of the bridge girder. FIG. 5 shows the second part of this device.
The top view which shows a part of seismic isolation bearing device of the bridge girder which concerns on an Example,
FIG. 6 is an enlarged sectional view taken along the line CC of FIG. FIG. 7 is a partially longitudinal front view showing an elastic slide bearing used in an embodiment of the present invention, FIG. 8 is a plan view thereof, and FIG. 9 is a horizontal force bearing elastic stopper used in an embodiment of the present invention. The front view and FIG. 10 are sectional views taken along the line D-D in FIG. FIGS. 11 to 13 show a first example of a buffer bearing which can be used when the present invention is carried out. FIG. 11 is a plan view, FIG. 12 is a front view, and FIG. FIG. 12 is a sectional view taken along line EE of FIG. 12. FIG. 14 is a plan view showing a second example of a buffer bearing which can be used when the present invention is carried out,
Figure 15 is the front view. In the figure, 1 is a bridge girder, 2 is an abutment, 3 is a girder mounting part, 4 is a sliding plate, 5 is an elastic slide bearing, 6 is a horizontal force bearing elastic stopper, 7 is a bridge girder bearing front surface, 8 is a bridge girder end surface, 9 is a front buffer support, 10 is a bridge girder support side surface, 11 is a bridge girder side surface, 12 is a side buffer support, 13 is a sliding support plate, 14 is a rubber material, 15 is an upper metal plate, 16 is a lower metal plate. , 18 is a steel support plate, 19 is a rubber layer, 20 is a steel plate, 21 is a steel anchor rod, 24 is a steel holding plate, 25 is a rubber layer, 26 is a steel plate, 27 is a through hole, 28 is a ridge, 29 is a pier, 30 is an anchor rod, 31 is a steel reinforcing plate, 32 or
34 is an anchor bolt.

Claims (2)

[Scope of utility model registration request] Claims: 1. A girder mounting part is provided with a sliding plate 4 fixed to one of a lower surface of an end of a girder 1 or a girder mounting part 3 of an abutment 2 and an elastic slide bearing 5 fixed to the other. 3, the bridge girder 1 is supported via the slide plate 4 and the elastic slide bearing 5, and the horizontal force-bearing elastic stoppers 6 are interposed between the lower surface of the end of the bridge girder 1 and the girder rest 3 of the abutment 2 between them. The upper and lower parts of the bridge are fixed, and the front shock-absorbing bearing 9 is arranged between the bridge girder support front face 7 and the bridge girder end face 8 of the abutment 2.
Is fixed to one of the bridge girder support front face 7 or the bridge girder end face 8, and a gap is provided between the front buffer support 9 and the other of the front face 7 or the bridge girder end face 8, The side buffer support 12 arranged between the bridge girder support side 10 and the bridge girder side 11 in 2 is fixed to one of the bridge girder support side 10 or the bridge girder side 11, and is a side buffer support. A seismic isolation bearing device for a bridge girder in which a gap is provided between 12 and the other of the side surface 10 or the bridge girder side surface 11. 2. A sliding plate 4 is fixed to one of the bottom surface of the end of the bridge girder 1 and the girder mounting portion 3 of the abutment 2, and an elastic sliding bearing 5 having a sliding bearing 13 is fixed to the other. The bridge girder 1 is supported by the girder mounting portion 3 through the sliding plate 4 and the elastic sliding bearing 5, and is composed of a rubber material 14 and an upper metal plate 15 and a lower metal plate 16 fixed to both upper and lower surfaces thereof. The force bearing elastic stopper 6 is interposed between the lower surface of the end portion of the bridge girder 1 and the girder mounting portion 3 of the abutment 2 and fixed thereto, and the front portion fixed to the bridge girder support front surface 7 of the abutment 2. A gap is provided between the buffer bearing 9 and the bridge girder end surface 8, and a gap is provided between the side buffer bearing 12 fixed to the bridge girder bearing side 10 of the abutment 2 and the bridge girder side 11. Seismic isolation support device for bridge girders.