JPH10280325A - Expansion joint for bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion joint for a bridge which makes it possible to satisfy a displacement-absorbing function and a load-support function at the same time. SOLUTION: Pavements 15, 15 are laid on floor plates 11a, 11b respectively and a blockout space 16 is formed between the cut faces of both pavements 15. A plurality of load-support blocks 18 are arranged at every specified distance through a positioning means 17 made of a net member or the like assembled with reinforcing bars or the like, in the blockout space 16. The load-support blocks 18 are formed to have nearly the same height with the height H of the blockout space 16. Accordingly, the upper face layer 18a of the load-support blocks 18 is made to be flush with the pavement face 15a when the load-support blocks 18a are arranged in the blockout space 16 through the positioning means 17.

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, and more particularly to an expansion joint for a bridge in which a seam portion of a road bridge is integrated with pavement so as to achieve both displacement absorbing performance and load supporting performance. It is.

[0002]

2. Description of the Related Art In recent years, buried joints have been constructed in bridges having a small amount of expansion and contraction so as to connect a gap formed in a shore portion with a pavement road surface for the purpose of improving running performance and environmental measures. This buried joint needs to satisfy both the displacement absorbing function such as the expansion and contraction of the bridge girder due to the temperature change and the rotation displacement of the girder end due to the bending of the bridge girder, and the load supporting performance of the traveling vehicle.

However, conventional buried joints suffer from damages such as cracks due to insufficient displacement absorbing performance and so-called flow due to insufficient load supporting performance, and there remains a problem in durability. For example, if the material of the embedded joint is made to be too soft and the material is made too soft, the flow bearing tends to be generated, and the load bearing performance cannot be satisfied. However, if the material is made too hard in order to eliminate the flow rutting, there is a problem that cracks are generated or a construction width is widened.
Therefore, at the present time, it is extremely difficult to achieve both of these performances.

An object of the present invention is to provide an expansion joint for a bridge capable of simultaneously satisfying a displacement absorbing function and a load supporting performance.

[0005]

According to the present invention, in order to achieve the above object, a plurality of load supporting blocks are dispersedly arranged at intervals on a floor plate at a joint of a road bridge via positioning means. The gap between the load supporting blocks is filled with the displacement absorbing filler, and the surfaces of the displacement absorbing filler and the load supporting block are flush.

In this way, the gap between the load supporting blocks dispersedly arranged on the floor plate at the joint of the road bridge is filled with the displacement absorbing filler, so that the load supporting block and the displacement absorbing filler are filled. The two members are in harmony, and the displacement absorbing function and the load supporting performance can be satisfied at the same time.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a bridge expansion joint according to the present invention, in which 11a and 11b are concrete floor plates, and 12 is a play space formed between the ends of two floor plates 11a and 11b. The idle space 12 is filled with a back-up material 13 and a binder 14 is injected onto the back-up material 13 to provide a water stopping function.

On the floorboards 11a and 11b, pavements 15 and 15 are provided, respectively, and a box empty space 16 is formed between the floorboards 11a and 11b and the cut surfaces of the pavements 15 and 15 respectively. A plurality of load support blocks 18 are disposed in the box-opening space 16 at predetermined intervals via positioning means 17 such as a net material assembled with a reinforcing bar or the like. The load support block 18
It is formed at substantially the same height as the height H of the box empty space 16. Therefore, when the load support block 18 is disposed in the box-free space 16 via the positioning means 17, the upper surface layer 18a of the load support block 18 is flush with the pavement surface 15a.

A gap 19 formed between the load supporting blocks 18 is filled with a displacement absorbing filler 20. The displacement absorbing filler 20 is applied so that the upper surface layer 18a of the load supporting block 18 is exposed from the displacement absorbing filler 20 in order to sufficiently exhibit its load supporting function. As shown in FIGS. 2 to 4, the positioning means 17 of the load support block 18 is a support body 21 formed in a mesh shape from a rod-shaped metal material (rebar) or a resin material. A cross-shaped concave portion 22 formed on the bottom surface side of the load support block 18 is fitted to the intersection X of the support body 21 to be positioned and fixed, and the load support block 18 moves when the displacement absorbing filler 20 is injected and filled. To prevent slipping or shifting.

[0010] As another embodiment of the positioning means 17, as shown in FIGS. 5 and 6, a pin 23 is projected from an intersection X of the support 21 so as to be formed on the bottom surface of the load support block 18. Into the cross portion X of the cross-shaped concave portion 22, or as shown in FIG.
A cross-shaped recess 24 is formed in the upper surface layer 18a, and the load support blocks 18 are arranged at predetermined intervals. good.

Further, although not shown, load supporting blocks are attached at predetermined intervals to a mesh-shaped support made of a rod-shaped metal material or a resin material in advance, and a load is formed between the support and the support integrally formed in advance. A unit with the support block is disposed on the floor boards 11a and 11b of the box-opening space 16, and a locking pin (not shown) is previously provided at a predetermined position on the floor plates 11a and 11b of the box-opening space 16. Planted,
The center portion of the load support block 18 may be inserted into the locking pin and positioned and fixed.

Further, as the displacement absorbing filler used in the present invention, a dense particle asphalt mixture, a mixture of a hot melt type rubber or resin and a hard aggregate are preferably used. The hardness of the load support block 18 is JIS A hardness 5
It is preferably from 0 to 70, and if it is less than JIS A hardness 50, it is too soft to sufficiently exert the load supporting function, and if it is greater than JIS A hardness 70, it is too hard to exhibit the displacement absorption function. Difficult to do.

By distributing the load supporting blocks 18 so as to occupy a total of 10% to 70% of the entire area of the road bridge joint, the displacement absorbing function and the load supporting performance can be simultaneously satisfied. It is. On the other hand, if the area of the load supporting block is less than 10%, the area of the displacement absorbing and filling member becomes too large, so that flow ruts and the like are easily generated. However, there is a problem that the displacement absorption function is reduced.

[0014] The surface area of one per load supporting block 18, in order to satisfy the displacement absorbing function and the load supporting performance at the same time, it is preferable that 25mm ² ~10,000mm ^2. If it is smaller than 25 mm ² , the load supporting function cannot be sufficiently exhibited due to falling down when receiving a load, and the
If it is larger than 0 mm ^{2, since} it is difficult to disperse the load support block 18 and the displacement absorbing filler,
The ratio at the partial portion is greatly different, so that the displacement absorbing function cannot be sufficiently exhibited where the load supporting block 18 is high, and the load supporting function is sufficiently exhibited where the ratio of the displacement absorbing filler is large. There is a problem that cannot be done.

The surface layer 18a of the load support block 18
Is preferably a circle or a polygon such as a triangle or an octagon, as shown in FIGS. 8 (a), 8 (b) and 8 (c). As described above, the floorboard 1
The load supporting blocks 18 are dispersed and arranged at predetermined intervals on the la and 11b via the positioning means 17, and the gap 19 between the load supporting blocks 18 is filled with the displacement absorbing member 20. The functions of the two members work together to simultaneously satisfy the displacement absorbing function and the load supporting performance.

[0016]

As described above, according to the present invention, a plurality of load supporting blocks are dispersedly arranged at intervals on the floor plate of the road bridge joint via the positioning means, and the gap between these load supporting blocks is provided. The portion is filled with the displacement absorbing filler and the surfaces of the displacement absorbing filler and the load supporting block are flush with each other, so that the displacement absorbing filler reduces the occurrence of cracks by the cooperation of the load supporting block. While effectively preventing the occurrence of flow rutting, the displacement absorbing function and the load supporting performance can be satisfied at the same time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a bridge expansion joint embodying the present invention.

FIG. 2 is a partial plan view of a load support block provided and fixed to a positioning means.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a perspective view showing an engagement state between a positioning unit and a load support block.

FIG. 5 is a perspective view of another embodiment showing an engagement state between a positioning unit and a load support block.

FIG. 6 is a cross-sectional view showing an engagement state between a positioning unit and a load support block in FIG. 5;

FIG. 7 is a perspective view of another embodiment showing an engagement state between a positioning unit and a load support block.

FIGS. 8A, 8B, and 8C are explanatory views showing an embodiment of the shape of the surface layer of the load support block.

[Explanation of symbols]

11a, 11b Floor plate 12 Floor space 13 Back-up material 14 Binder 15 Pavement 16 Box empty space 17 Positioning means 18 Load support block 18a Surface layer of load support block 19 Void 20 Displacement absorbing filler 21 Support 22 Depression 23 Pin 24 Depression 25 Pipe X intersection

Claims (8)

[Claims] 1. A plurality of load supporting blocks are dispersedly arranged at intervals on a floor plate at a joint portion of a road bridge via a positioning means, and a gap between these load supporting blocks is filled with a displacement absorbing filler. An expansion joint for bridges, wherein the surfaces of the displacement absorbing filler and the load support block are flush with each other. 2. The expansion joint for a bridge according to claim 1, wherein the displacement absorbing filler is a mixture of dense-grained asphalt mixture, hot-melt type rubber or resin and hard aggregate. 3. The expansion joint for a bridge according to claim 1, wherein the load support block is a rubber molded body. 4. The expansion joint for a bridge according to claim 1, wherein the positioning means is a net made of a combination of metal or resin rods. 5. The hardness of the load supporting block is JIS A
The expansion joint for a bridge according to any one of claims 1 to 4, having a hardness of 50 to 70. 6. The total area of the load supporting block occupying the road bridge joint is 10% of the total area of the road bridge joint.
The expansion joint for a bridge according to any one of claims 1 to 5, which is 70 to 70%. 7. A surface area per one said load supporting block, according to claim 6 is 25mm ² ~10,000mm ²
The expansion joint for a bridge according to any one of the above. 8. A plan view shape of the load support block,
8. A method according to claim 1, wherein the shape is a circle or a polygon.
Expansion joints for bridges according to the item.