JPH09302622A - Bearing structure for bridge beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing structure in which a movable bearing member interposed between the top of a bridge footing and a polydiametrical continuous beam serves as a slidable bearing during normal movement, but serves as a stationary bearing or a resilient stationary bearing during earthquake. SOLUTION: In a resilient movable bearing member 4b, an engaging recess 8 having a concave cross-sectional shape is formed in the upper surface of the base plate 6 which is secured to the top of a bridge footing 1a by means of fastening members 1X such as anchor bolts. A slidable plate 7 is attached to a bearing member 5 which is attached to the lower surface of a polydiametrical continuous beam 3, by means of fasenting members 5a such as bolts, and is formed with an engaging protrusion 9 which is engaged in the recess 8 in the base plate 6 with a predetermined motion gap therebetween. Dilatancy material 10 is filled in the motion gap H between the recess 8 and the protrusion 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a bridge, and more particularly, to a plurality of lower structures standing upright at predetermined intervals, that is, a fixed support member and a movable support member on an abutment and a pier. The present invention relates to an improvement of a support structure for a bridge in which a multi-span continuous girder is mounted via

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a multi-span continuous girder 3 is mounted on a plurality of bridge piers 1 which are erected at predetermined intervals via a fixed bearing 2a and a movable bearing 2b. In the bridge support structure that is installed, when inertial force F acts during an earthquake, there is a problem that the inertial force of the upper structure is concentrated on the fixed bridge pier 1A.

Further, as a method of distributing the inertial force F at the time of an earthquake to each pier 1, as shown in FIG. 7, a steel fixed bearing 2 is used.
A multi-point fixing method using a and an elastic fixing method using an elastic bearing 2c such as rubber have been proposed and adopted as shown in FIG.

[0004]

However, in the bridge support structure using the fixed support 2a and the movable support 2b shown in FIG. 7, as described above, the inertial force of the upper structure at the time of the earthquake is concentrated on the fixed bridge pier 1A. The problem is that the multi-point fixing method of FIG. 8 imposes a heavy load on the pier 1 during constant movement due to temperature changes and the elastic fixing method of FIG. 9 makes it difficult to design the end fulcrum with a large amount of constant movement. Therefore, sliding bearings are often used. In this case, inertial force is not shared.

The present invention was devised in view of such conventional problems, and a moving support member provided between a bridge pier and a multi-span continuous girder does not always move. It functions as a sliding movable support, and when an earthquake occurs, it functions as a fixed support or an elastic fixed support, which can greatly reduce the horizontal force applied to the pier during constant movement, and also can disperse the inertial force as a fixed support during an earthquake. The purpose is to provide a supporting structure for bridges.

[0006]

In order to achieve the above object, the present invention forms an engaging recess having a concave cross section on the upper surface of a base plate fixed to the upper end surface of a lower structure of a bridge, and forms the lower surface of an upper structure. An engaging protrusion that engages slidably in the engaging recess of the base plate via a slide plate with a predetermined movement gap is provided on the bearing attached to the engaging recess and the engaging protrusion. The gist is that the dilatancy material is filled in the moving gap between and.

The supporting body is a laminated body of a rubber-like elastic material and a metal plate or a steel fixed supporting body, and the engaging convex portion provided on the sliding plate communicates with the dilatancy material flowing through a gap during movement. It forms a hole. In addition, the engaging concave portion of the base plate may be formed in a C-shaped cross section, and the engaging convex portion provided on the sliding plate may be provided with a protruding portion that engages with the engaging concave portion having the C-shaped cross section. It is possible.

The present invention is constructed as described above, and as the moving support member, the engaging recess is formed on the upper surface of the base plate fixed on the pier, and the sliding plate is formed on the support body attached to the lower surface of the multi-span continuous girder. By filling the movement gap with the engaging convex part provided with the dilatancy material, it functions as a sliding movable support for constant movement, and functions as a fixed support or elastic fixed support during an earthquake. By doing so, it is possible to greatly reduce the horizontal force applied to the pier during constant movement, and to disperse the inertial force as a fixed bearing during an earthquake.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a schematic configuration diagram of a bridge support structure showing a first embodiment of the present invention. In the first embodiment, a horizontal inertia force F at the time of an earthquake is generated.
Are configured to be distributed over all piers 1.

That is, the support member main body 4 is placed on the five piers 1a, 1b, 1c, 1d and 1e which are erected at predetermined intervals.
The multi-span continuous girder 3 is placed via the. In this embodiment, as the supporting member main body 4 between the central bridge pier 1c and the multi-span continuous girder 3, a conventional elastic fixed supporting member 4a such as rubber is used, and the supporting member main bodies 4 on both sides thereof are The elastic movement support member 4b according to the invention is used.

That is, the elastic movement support member 4b is, as shown in FIGS. 3 and 4, mounted on the upper surface of the base plate 6 fixed on the piers 1a, 1b, 1d, 1e via fastening members 1x such as anchor bolts. An engaging recess 8 having a recessed cross section is formed. Further, a slide plate 7 is attached to a supporting body 5 attached to the lower surface of the multi-span continuous girder 3 via a fastening member 5a such as a bolt, and the engaging recess of the base plate 6 is attached to the slide plate 7. 8 is provided with an engaging protrusion 9 that slidably engages with a predetermined moving gap H in the horizontal direction, and the dilatancy material 10 is placed in the moving gap H between the engaging recess 8 and the engaging protrusion 9. It is filled.

The dilatancy material 10 is, for example, asphalt, some kind of silicon putty, pine or the like. Further, the support body 5 is a laminated body of a rubber-like elastic material 5x and a metal plate 5y, and the dilatancy material 10 circulates in the moving gap H in the engaging convex portion 9 provided on the sliding plate 7. A communication hole 11 is formed. This communication hole 11
Need not necessarily be provided, and the dilatancy material 10 may be circulated in the gap 17 between the engagement concave portion 8 and the engagement convex portion 9.

Further, PTFE (tetrafluoroethylene resin) is provided on the contact surface of the sliding plate 7 with the base plate 6, and a stainless plate is arranged on the upper surface of the base plate 6. Alternatively, a stainless steel plate may be arranged on both sides and molybdenum disulfide powder may be applied between them. The support 5 is the base plate 6
It is fixed vertically by a fixing block 16 having a hook 15 at the tip.

FIGS. 5 and 6 show another embodiment of the base plate 6 and the engaging protrusions 9. In this embodiment, the engaging recess 8a of the base plate 6 has a C-shaped cross section. In addition to being formed in a (channel shape), the engaging projection 9a provided on the sliding plate 7 is formed so that projections 12 that engage with the engaging recess 8a having a C-shaped cross section are provided on both sides. To do. With this configuration, the fixed block becomes unnecessary.

Further, in the moving gap H formed between the engaging concave portion 8a and the engaging convex portion 9a, the dilatancy material 10 is provided.
And the engaging convex portion 9a is formed with a communication hole 11a through which the dilatancy material 10 flows through the moving gap H. The dilatancy material 10 flows as little resistance as a normal liquid when a slight force is gradually applied, and almost like a solid when a sudden force is applied, or has an extremely high viscosity. It has the property of acting like a viscous body.

Therefore, the dilatancy material 10 circulates through the communication hole 11 or the gap 17 when the girder moves slowly due to a temperature change or the like, but the dilatancy material 10 against the shocking force such as an earthquake. 10 is solidified, and the engaging portion functions as a fixed elastic fixing support. Therefore, in the first embodiment configured as described above, the horizontal inertial force F at the time of an earthquake is dispersed to all the piers 1, and the function of the support member 5 is to allow sliding movement relative to normal movement. It functions as a bearing, and in the event of an earthquake, it functions as an elastic fixed bearing, which can greatly reduce the horizontal force applied to the pier during constant movement, and can disperse the inertial force as a fixed bearing during an earthquake.

FIG. 2 shows a second embodiment of the present invention. In the second embodiment, the support member main body 14 between the central pier 1c and the multi-span continuous girder 3 is made of steel. The support member 14a is used, and the moving support member bodies 14b on both sides thereof are used.
In this example, a structure in which the support body 5 of the first embodiment is a steel fixed support is used. Also in the case of the second embodiment, the horizontal force F at the time of the earthquake is distributed to all the piers 1,
Further, the function of the bearing 5 is that it functions as a sliding movable bearing against a constant movement and functions as a fixed bearing during an earthquake.

[0018]

As described above, according to the present invention, there is provided a support body mounted on the lower surface of the upper structure in which the engaging recess having a concave cross section is formed on the upper surface of the base plate fixed to the upper surface of the lower structure of the bridge. An engaging protrusion that slidably engages with the engaging recess of the base plate via a sliding plate with a predetermined moving gap, and in the moving gap between the engaging recess and the engaging protrusion, Since the dilatancy material is filled, it has the following excellent effects. . It functions as a sliding movable bearing for constant movement,
By functioning as a fixed bearing or an elastic fixed bearing during an earthquake, the horizontal force applied to the pier during constant movement can be significantly reduced, and during an earthquake, inertial forces can be dispersed as a fixed bearing. . When an elastic bearing member such as rubber is used as the bearing structure interposed between the bridge pier and the multi-span continuous bridge,
Elastic movement is possible even under the condition that the conventional elastic fixation bearing is not possible on the end fulcrum due to the large amount of movement at all times.
The pier can share the inertial force, and the rubber thickness of the bearing member can be reduced. . As a bearing structure provided between the bridge pier and the multi-span continuous girder, for example, when using a steel fixed bearing member,
It can significantly reduce the horizontal force applied to the pier during constant movement, and can disperse the inertial force as a fixed bearing during an earthquake.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a bridge support structure showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a bridge support structure showing a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a bearing member used in the embodiment of the present invention.

FIG. 4 is a partial cross-sectional view taken along the line AA of FIG.

FIG. 5 is a partial cross-sectional view of another bearing member used in the embodiment of the present invention.

6 is a partial cross-sectional view taken along the line BB of FIG.

FIG. 7 is a schematic configuration diagram of a conventional movable and fixed type bridge support structure.

FIG. 8 is a schematic configuration diagram of a conventional bridge support structure of a multi-point fixing system.

FIG. 9 is a schematic configuration diagram of a conventional elastic fixing type support structure for a bridge.

[Explanation of symbols]

1 bridge pier 1a, 1b, 1c, 1d, 1e bridge pier 1x fastening member 3 multi-span continuous bridge 4 support member body 4a elastic fixed support member 4b elastic movement support member 5 support body 5a fastening member 6 base plate 7 sliding plate 8 engagement Recessed portion 9 Engagement protruding portion 10 Highly viscous substance 11 Communication hole 5x Rubber-like elastic material 5y Metal plate 12 Protrusion H Moving gap 15 Hook 16 Fixed block 17 Gap

Claims (5)

[Claims] 1. An engagement recess having a recessed cross section is formed on an upper surface of a base plate fixed to an upper end surface of a lower structure of a bridge,
The support body attached to the lower surface of the upper structure is provided with an engaging projection that slidably engages with the engaging recess of the base plate via a sliding plate with a predetermined movement gap. A supporting structure for a bridge, characterized in that a dilatancy material is filled in a moving gap between the engaging convex portion and the engaging convex portion. 2. The support structure for a bridge according to claim 1, wherein the support is a laminated body of a rubber-like elastic material and a metal plate. 3. The support structure for a bridge according to claim 1, wherein the support body is a steel fixed support. 4. The support structure for a bridge according to claim 1, wherein a communication hole through which the dilatancy material flows through a gap during movement is formed in an engaging convex portion provided on the sliding plate. 5. The engaging concave portion of the base plate is formed in a C-shaped cross section, and the engaging convex portion provided on the sliding plate is provided.
The support structure for bridges according to any one of claims 1 to 4, wherein a protrusion that engages with the engagement recess having a C-shaped cross section is provided.