JP2929165B2 - Bridge expansion joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion joint for a bridge.

[0002]

2. Description of the Related Art An example of this type of expansion joint is shown in FIG. As shown in FIG. 8, the expansion joint basically has anchor members 90, 90 buried in adjacent bridge girders H, H, and a U-shaped cross section screwed to the anchor members 90, 90, respectively. Cradle 91,
An expandable and contractible surface rubber member 92 screwed to the upper plate portion 91a of the pedestal 91, and a receiving plate 93 bridged over a lower plate 91b of the pedestal 91 to receive a load on the surface rubber member 92
A thin rubber member 94 is attached to the receiving plate 93.

Therefore, in this expansion joint, even if a step is generated between the bridge girders H and H due to the expansion and contraction of the bridge pier and the movement of the load, the noise generated when the vehicle passes through the expansion joint due to the presence of the rubber material 94 described above. Is suppressed.

[0004] However, the above-mentioned expansion joint has a problem that the noise suppressing effect is lost in a short period of time.

[0005] This is because the lower plate 91b of the pedestal 91 does not change even if the step between the bridge girders H, H changes as shown in FIGS.
This is because the contact point is always at the same position P (end), and the portion is worn out in a short period of time.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an expansion joint for bridges having a long-term noise suppression effect.

[0007]

SUMMARY OF THE INVENTION The present invention provides an anchor member 1, 1 embedded in an adjacent bridge girder H, and a pedestal 2 screwed to the anchor member 1, 1, respectively.
A stretchable surface elastic body 3 screwed in a manner of bridging the support bases 2 and 2, and a support plate bridged between the bridge girders H and H to receive a load on the surface elastic body 3 4. An expansion joint for a bridge, comprising: a support plate 4 for the bridge girder H;
A relatively thick, wide and hard elastic material 5 is stuck to a portion opposed to the elastic member 5, and a contact surface of the elastic material 5 with the receiving plate 4 is formed in a substantially R-shaped cross section.

The present invention also provides an anchor member 1, 1 buried in an adjacent bridge girder H, a pedestal 2 screwed to the anchor member 1, 1 respectively, and a pedestal 2, 2 An elastic body for a bridge, comprising: a stretchable surface elastic body 3 screwed in a manner to bridge the bridge; and a support plate 4 bridged between the bridge girders H and H to receive a load on the surface elastic body 3. A relatively thick, wide and hard elastic material 5 is attached to a portion of the receiving plate 4 facing the bridge girder H, and a contact surface of the elastic material 5 with the bridge girder H is substantially R-shaped in cross section.
It is formed in a shape.

[0009]

The present invention operates as follows.

In the expansion joint for a bridge according to the present invention, the bridge H, H
When the mutual step changes, the contact point between the substantially R-shaped cross section of the hard elastic member 5 and the bridge H or the receiving plate 4 changes, so that a part of the elastic member 5 is concentrated. There is no wear. Therefore, in the above-mentioned expansion joint for bridges, there is little partial damage to the elastic member 5, and the
The suppression effect can be maintained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described with reference to the drawings shown as embodiments.

As shown in FIGS. 1 and 2, the expansion joint for a bridge according to this embodiment is basically composed of anchor members 1 and 1 embedded in adjacent bridge girders H and H, respectively. 1 and a stretchable surface layer elastic body 3 screwed in a manner of bridging the support 2 and 2
And a bridge girder H, H for receiving a load on the surface elastic body 3.
And a receiving plate 4 spanned between them.

As shown in FIG. 1, the anchor member 1 is formed by welding an anchor bolt 11 to an anchor nut 10 and fixed to a reinforcing bar h embedded in a bridge girder H by welding.

As shown in FIGS. 1 and 2, the pedestal 2 has an upper plate 20 made of a steel plate and a lower plate 21 made of a steel plate and having a width about three times the width of the upper plate 20. And the upper and lower plates 20, which are formed to have a width about twice as large as the upper plate 20,
21 and a rubber material 22 interposed therebetween, and these are integrated by an adhesive. As shown in FIG. 1, a hard elastic material 5 (material: rubber, urethane, polyester, nylon) having a relatively large width and a large radius of curvature is provided on the upper surface of each of the lower plates 21 and 21 on the facing portion side. Dimensions “unit mm”: an example is shown in FIG. 6). Then, the cap nut 22b is fixed to the upper plate 20 so as to be embedded in the rubber material 22, and
Rubber material 22 protruding from upper plate 20 in top view
A through-hole 22a is formed in the portion. The cradle 2 is screwed to the anchor nut 10 with a bolt B3 as shown in FIG.

As shown in FIGS. 1 and 2, the surface layer elastic body 3 is made of a thick belt-like rubber having a constant width (an elastomer such as resin can also be used).
A thin portion 30 slightly wider than the thin portion 30 is formed, and a steel plate 31 is fixed to the lower surface of the thin portion 30. As shown in FIGS. 1 and 2, the thin portion 30 has a through-hole 30a for receiving the head of the bolt B1, and a steel plate 31 corresponding to the thin portion 30 has a bolt. A long hole 31a into which the male screw portion of B1 is inserted is formed, and a through hole 30b in which the component wall is formed of a steel plate is formed in the middle of the surface elastic body 3 in the width direction. Further, as shown in FIGS. 1 and 2, the surface elastic body has a large number of narrow grooves 30c formed on the upper surface and a large number of large holes 30d formed on the lower surface in order to enable expansion and contraction in the width and length directions. I have.

As shown in FIGS. 1 and 2, the receiving plate 4 has a screw hole 41 (a hole into which the hexagonal bolt B2 is screwed when integrated with the surface elastic body 3) in the middle in the width direction. It is formed of a thick steel plate provided.

When the expansion joint of this embodiment is installed on an adjacent bridge girder, the following operations are performed (see FIG. 1). The bridge girder H, H
Buried. The anchor bolt 11 of the anchor member 1 is welded to the reinforcing bar h. The lower plate 21 of the pedestal 2 is screwed to the anchor nut 10 with the bolt B3. The surface elastic body 3 integrated with the receiving plate 4 by the hexagonal bolt B2 is screwed to the upper plate 20 of the receiving base 2 by the bolt B1.

Further, in the expansion joint for bridge of this embodiment,
When the step between the bridge girders H, H changes as shown in FIGS. 3, 4, and 5, the contact point between the elastic member 5 provided on the bridge girders H and the receiving plate 4 changes (position P1, position P2, position P2). (Change to P3)
Therefore, a part of the elastic member 5 does not wear intensively. Therefore, this bridge expansion joint has little partial damage, and thus has a long-term noise suppression effect.

The lower plate 2 of the receiving plate 4 is replaced with the above embodiment.
A relatively thick wide elastic member 5 is attached to a portion facing the first elastic member 1, and a contact surface of the elastic member 5 with the lower plate 21 has a cross section of approximately R.
Even when formed in a shape, the same effects as in the above embodiment can be obtained.

Further, the R-shaped section of the elastic member 5 in the above embodiment may be formed in a complete arc shape (dimension "unit mm": an example is shown in FIG. 7). Are equal, the bridge girder H has the same contact area with the receiving plate 4 or the lower plate 21 irrespective of the amount of the step.

[0021]

Since the present invention has the above-described configuration, it has the following effects.

From the contents described in the above operation, an expansion joint for a bridge having a noise suppressing effect for a long time can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bridge expansion joint according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the bridge expansion joint.

FIG. 3 is a front view showing a contact point between a receiving plate and an elastic material when a step is not generated in a bridge girder.

FIG. 4 is a front view showing a contact point between a receiving plate and an elastic material when a small step is formed in the bridge girder.

FIG. 5 is a front view showing the contact point between the receiving plate and the elastic member when a large step is formed in the bridge girder.

FIG. 6 is a diagram showing a cross-sectional shape and the like of the elastic material.

FIG. 7 is a diagram illustrating a cross-sectional shape and the like of an elastic material according to another embodiment.

FIG. 8 is a cross-sectional view of a prior art expansion joint for a bridge.

FIG. 9 is a front view showing a contact point between the elastic member and the bridge girder when a small step is generated in the bridge girder in the prior art expansion joint for bridges.

FIG. 10 is a front view showing a contact point between an elastic material and a bridge girder when a large step is generated in the bridge girder in the prior art expansion joint for bridges.

[Explanation of symbols]

 H Bridge girder h Reinforcing bar 1 Anchor member 2 Cradle 3 Surface elastic body 4 Receiving plate 5 Elastic material 10 Anchor nut 11 Anchor bolt 20 Upper plate 21 Lower plate 22 Rubber material

Claims (2)

(57) [Claims] An anchor member (1) (1) embedded in an adjacent bridge girder (H) (H), and a pedestal (2) screwed to the anchor member (1) (1), respectively. ,
A stretchable surface elastic body (3) screwed in a manner of bridging over the cradle (2) (2); and the surface elastic body (3).
And a receiving plate (4) bridged between the bridge girders (H) and (H) to receive a load on the bridge girder. A relatively thick, wide and hard elastic material (5) is attached to the opposing portion, and a contact surface of the elastic material (5) with the receiving plate (4) is formed in a substantially R-shaped cross section. An expansion joint for bridges characterized by the following. 2. An anchor member (1) embedded in each of adjacent bridge girders (H) and (H), and a pedestal (2) screwed to each of the anchor members (1) (1). ,
A stretchable surface elastic body (3) screwed in a manner of bridging over the cradle (2) (2); and the surface elastic body (3).
And a receiving plate (4) bridged between the bridge girders (H) and (H) to receive a load on the bridge girder. A relatively thick, wide and hard elastic material (5) is attached to the opposing portion, and a contact surface of the elastic material (5) with the bridge girder (H) is formed to have a substantially R-shaped cross section. A characteristic expansion joint for bridges.