JP3416646B2 - Structure of mounting part of expansion joint - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a mounting portion of expansion joints of floor slab ends facing each other with a play gap interposed therebetween.

In a bridge structure such as an elevated road, an expansion joint is installed at the facing floor slab end across a play space.

In the expansion joint 1, as shown in FIG. 4 (one of the facing floor slab ends is omitted), an anchoring portion 3 and an anchor bar are provided in a notch portion of an end of the floor slab 2 facing each other. 4, anchored via a concrete anchor 5, etc., and a back-filling concrete layer 6 is placed and installed. Reference numeral 7 is a pavement layer made of asphalt.

[0004]

The structure of the mounting portion of the expansion joint 1 is such that when the vehicle is running, rutting occurs in the pavement layer 7 due to the difference in the amount of wear between the backfill concrete layer 6 and the pavement layer 7. As shown in FIG. 5 (one of the slab ends facing each other is omitted), a step is formed between the backfill concrete layer 6 and the pavement layer 7.

When a step is formed between the backfilling concrete layer 6 and the pavement layer 7, the tire of the traveling vehicle collides with the stepped portion of the backfilling concrete layer 6, which not only impacts the traveling vehicle, but also causes noise and noise. It is a source of vibration.

The present invention is intended to solve such problems by the means described below.

[0007]

[Means for Solving the Problems] First, basically, a rubber plate formed of an inclined material is provided on the backfilling concrete layer at the installation location of the expansion joint at the installation portion of the expansion joint from the pavement layer side. This can be solved by adopting a structure in which the amount of wear is gradually reduced toward the side and the unit is installed almost flush with the pavement surface.

The term "gradient material" as used herein means that when there is wear due to continuous friction, a graded or graded gradient is formed without causing a large step between the materials due to the type and properties of the material which is continuous or more. It is a material that is used.

In the above construction, the rubber plate formed of the inclined material is a rubber plate that is easily worn on the pavement layer side, and is hard to wear on the expansion joint side, both rubber plates. A good example is that a rubber plate that wears in the middle of the wear of both rubber plates is formed continuously in the interval.

Further, in the above structure, the rubber plate formed of, for example, an inclined material is a rubber plate made of a material that wears to the same extent as the pavement layer on the pavement layer side, and a back plate on the expansion joint side. The rubber plate is made of a material that wears to the same extent as the filled concrete layer, and between the rubber plates, a rubber plate that wears about the middle of the wear of both rubber plates is formed integrally with the connection.

Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a rubber plate 10 formed of a graded material used in the present invention. The rubber that forms the rubber plate is
For example, neoprene rubber, natural rubber, recycled rubber, and the like.

The rubber plate 10 is formed of an inclined material in which three types of rubber plates 10a, 10b, 10c having different wear amounts are arranged in the bridge axis direction in the order of the wear amount and connected by vulcanization adhesion. The overall size is set to a size that covers the backfilling concrete layer 6 described later, and the thickness is appropriately determined.

The amount of wear of the rubber plate 10 is, for example, JISK.
6264, in Akron abrasion test Method A-1, based on the conditions of the pressing load 44.1N, In the rubber plate 10a is 0.1 cm ^3/1000 times, with the rubber plate 10b 0.3 cm ³ / 1000 times, with the rubber plate 10c is 0.5 cm ³ / 1,000. The rubber plate 10a is less likely to be worn, and is about the same as the backfill concrete layer, the rubber plate 10c is likely to be worn, about the same as the pavement layer, and the rubber plate 10 is in the middle thereof.

FIG. 2 shows the structure of the mounting portion of the expansion joint in which the rubber plate 10 formed of the inclined material shown in FIG. 1 is installed. One of the facing slab ends is symmetrical and is omitted.

The expansion joint 1 is anchored to the facing notches of the floor slab 2 via anchoring portions 3, anchor bars 4 and concrete anchors 5. The rubber plate 10 is made of a material that easily wears. The rubber plate 10c that is easily worn is on the pavement layer 7 side, and the rubber plate 10a that is not easily worn is the expansion joint 1
Attach to backfill concrete layer 6 so that it is located on the side. In this embodiment, the back-filling concrete layer 6 is attached to the rubber plate 10 by inserting a concrete anchor 8 from below into a notch hole 11 which is notched from an upper part to an appropriate position in the rubber plate 10 and using a screw means 9 to form a rubber member. This is done by connecting the plate 10 and the concrete anchor, and embedding the concrete anchor 8 in the backfilling concrete layer 6. The rubber plate 10 and the pavement layer 7 are flush with each other. In this way, the mounting portion of the expansion joint is constructed as a whole.

FIG. 3 shows the relationship between the rubbing of the pavement layer and the rubber plate due to the vehicle running in FIG.

The vehicle enters from the pavement layer 7 side and enters the rubber plate 1
0, run through the expansion joint 1 to the opposite floor slab side. As the vehicle travels, the pavement layer 7 wears and flows over time, causing rutting A. At this time, the rubber plate 10 also wears, and rutting B is similarly generated. However,
The rubber plate 10 is made of an inclined material and is used to form the pavement layer 7
The rubber plate 10c which is easily worn or has a wear amount similar to that of the pavement layer is located on the side, and the rubber plate 10a which is hard to wear or has a wear amount similar to that of the backfill concrete layer is located on the expansion joint 1 side. Since the rubber plate 10 is installed on the pavement layer 7 side, the abrasion of the rubber plate 10 is large on the pavement layer 7 side and small on the expansion joint side. In the figure, the wear of the rubber plate 10 is drawn in an apparently slanted shape in order to express the effect, but due to the difference in the wear amount of the respective rubber plates 10a, 10b, 10c, they are worn in stages, but the step is reduced.

[0019]

As described above, the present invention has the following effects.

A rubber plate formed of an inclined material is provided above the backfilling concrete layer at the location where the expansion joint is installed so that the wear amount is gradually reduced from the pave layer side to the expansion joint side so that the rubber plate is substantially flush with the pave layer. Since the rutting by the running of the vehicle is performed in an inclined or stepwise manner from the pavement layer to the expansion joint direction, there is no step difference between the backfill concrete layer and the pavement layer.

Therefore, it is possible to suppress the impact on the traveling vehicle and the generation of noise and vibration due to the collision of the tire of the traveling vehicle with the step of the back-filling concrete layer as in the past. If necessary, the rubber plate can be replaced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a rubber plate formed of an inclined material used in the present invention.

FIG. 2 is a cross-sectional view showing an example of a structure of a mounting portion of an expansion joint according to the present invention.

FIG. 3 is a cross-sectional view showing an example of the relationship between the rubbing of the pavement layer due to vehicle traveling and the rubber plate in FIG.

FIG. 4 is a cross-sectional view showing an example of a structure of a mounting portion of a conventional expansion joint.

FIG. 5 is a cross-sectional view showing an example of the relationship between the rubbing of the pavement layer due to vehicle traveling and the rubber plate in FIG.

[Explanation of symbols]

1 expansion joint 2 floor slab 3 Anchoring part 4 anchor bar 5 concrete anchors 6 backfill concrete layer 7 pavement layers 8 concrete anchors 9 Screw means 10 rubber plate 10a rubber plate 10b rubber plate 10c rubber plate 11 Notch hole

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyoshi Murakami 3-105 Sugaya, Ageo City, Saitama Prefecture Fukoku Co., Ltd. (56) Reference JP-A-3-233006 (JP, A) JP-A-10-292315 ( JP, A) JP 3-208902 (JP, A) JP 6-158675 (JP, A) JP 61-282503 (JP, A) JP 61-169503 (JP, A) JP JP 5-79011 (JP, A) JP 5-79010 (JP, A) JP 11-158815 (JP, A) JP 11-148105 (JP, A) Actual development Sho 57-110105 (JP , U) Actual development Sho 61-188604 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E01C 11/02

Claims (3)

(57) [Claims] 1. A rubber plate formed of a graded material on the upper part of the backfilling concrete layer where the expansion joints are installed at the ends of the floor slabs facing each other across the play space, and the wear amount is gradually increased from the pavement layer side to the expansion joint side. The expansion joint mounting structure is characterized in that it is installed so as to be almost flush with the pavement layer. 2. The rubber plate formed of the inclined material is a rubber plate which is easily worn on the pavement layer side, and a rubber plate which is hard to be worn on the expansion joint side, or both rubber plates. The structure of the mounting portion of the expansion joint according to claim 1, wherein a space between the two rubber plates is continuous with a rubber plate that is worn to an intermediate level between the two rubber plates. 3. The rubber plate formed of the inclined material is a rubber plate made of a material that wears to the same extent as the pavement layer on the pavement layer side, and a rubber expansion joint on the expansion joint side. A rubber plate made of a material that wears to the same extent as the surface rubber, a rubber plate that does not easily wear steel expansion joints, and a rubber plate that wears between the two rubber plates in the middle of the wear of both rubber plates in a row. The structure of the mounting portion of the expansion joint according to claim 1, wherein