JPH083910A - Structure of joint part on road bridge and constructing method for joint - Google Patents

Abstract

PURPOSE:To provide a structure of a joint part on a road bridge wherein strength is high and work is easy. CONSTITUTION:A pair of corrugated upper vertical plates 1, 1, and a pair of corrugated lower vertical plates 2, 2, each of which is bent zigzag and is elongated in the longitudinal direction of a joint, are vertically put so as to be made flush with each other and butt parts are partially welded. A concrete thick slab 9, of which the end face is uneven, is formed by placing concrete at the rear part of the upper plate 1 and the lower plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road bridge joint structure and a method for constructing the same.

[0002]

2. Description of the Related Art As a seam structure of a road bridge, a pair of corrugated vertical plates bent in a zigzag pattern and extending in the longitudinal direction of the seam are erected so that the recesses and the projections of the corrugated plates face each other at the seam. , A zigzag bent corrugated space extending in the longitudinal direction of the seam is formed, and concrete is placed on the backs of both corrugated vertical plates to form a concrete relief plate (Japanese Patent Publication No. 62-62). -513
24). In this case, the height of the corrugated vertical plate is formed to be about 15 cm to the road surface, and therefore, the thickness of the concavo-convex plate on the back thereof is also comparable to the height of the corrugated vertical plate.

In recent years, a road bridge having a thicker slab has been constructed to cope with an increase in the number of vehicles having a large load, or a thicker slab of an existing road bridge has been constructed. Since a vehicle with a large load travels on a road bridge having a thick floor slab and a large load-bearing strength as described above, even in the joint structure of the road bridge as described above, a concrete uneven plate with a corrugated vertical plate is further added. It is necessary to increase the load carrying strength by increasing the thickness.

[0004] On the other hand, as a joint structure of a steel bridge,
As described in JP-B-57-25568, a tall corrugated vertical plate rising from the upper surface of the steel girder to the road surface is formed, and the bottom plate at the lower end of the corrugated vertical plate is connected to the steel girder by high-strength bolts. There is a proposal to do so. According to this,
It is possible to form a concrete relief plate with high load-bearing strength on the back of the corrugated vertical plate.

Further, Japanese Patent Publication No. 60-17883 discloses a proposal in which an upper corrugated vertical plate and a lower corrugated vertical plate are partially overlapped and welded to each other to form a tall corrugated vertical plate. Have been described.

[0006]

However, in the case of the method of fixing the bottom plate to the steel girder and raising the corrugated vertical plate among the above-mentioned conventional techniques, a tall corrugated vertical plate having a thickness equal to the floor slab thickness is used as a flat plate. It needs to be manufactured by bending, but this is difficult and the manufacturing cost is high. Moreover, there is a problem that it is difficult to adjust the upper end of the corrugated vertical plate to the road surface height.

In other words, the floor slab thickness of the road bridge is not formed to have a constant thickness over the entire length of the road width, but due to the fact that a cross slope is created on the road surface, for example, the central part of the width is thick and both ends are thin. Also, when concrete is poured, it may become slightly thicker or thinner than the designed thickness, and the camber return of the girder will not be as designed and the height of the floor slab will be out of order. There is. Therefore, it is necessary to manufacture the corrugated vertical plates each time according to the thickness of the floor slab of each road joint, and it is necessary to prepare a large number of corrugated vertical plates having different heights. In addition, it is actually difficult to adjust the upper end of the corrugated vertical plate to the road surface height, and if the upper end of the corrugated vertical plate is higher than the road surface, the traveling performance of the vehicle becomes extremely poor.

Further, in the case where a rubber sealing material is bonded by baking to the opposing inner surfaces of the pair of corrugated vertical plates, for example, both corrugated vertical plates are fixed in a vulcanizing mold, and the unvulcanized rubber material is subjected to both corrugated rubber plates. Heating and pressurization is applied to the vertical plate, but since the corrugated vertical plate is tall, it is necessary to manufacture a large die, and the cost of baking the sealing material increases.

On the other hand, in the case of the method in which the upper corrugated vertical plate and the lower corrugated vertical plate are partially overlapped among the above conventional techniques, it is not necessary to make the upper and lower corrugated vertical plates tall. , The difficulty of manufacturing is reduced, and the total height can be adjusted by changing the overlapping amount of the upper and lower corrugated vertical plates, but it is difficult to stack the upper and lower corrugated vertical plates without a gap. .

That is, in order to perform such superposition, it is necessary to adjust the pitch of the waves of the upper and lower corrugated vertical plates so that they can be superposed, and it is necessary to increase the dimensional accuracy thereof. However, it is extremely difficult to actually produce such a corrugated vertical plate, and it is often impossible to perform the desired superposition. When the road surface has a cross slope, the upper corrugated vertical plate needs to be slightly inclined according to the gradient of the road surface, which means that the upper corrugated vertical plate is arranged substantially horizontally. , Which also makes it difficult to overlap the upper and lower corrugated vertical plates. Further, when the upper corrugated vertical plate and the lower corrugated vertical plate are overlapped, it is necessary to make the height of each corrugated vertical plate extra high for the overlapping.

Further, if an existing joint member is damaged and is replaced with the above-mentioned corrugated joint member, the same problem occurs.

Accordingly, the present invention provides a joint structure having a large load-bearing strength and excellent manufacturability and workability of a member, and a method of constructing the joint structure.

[0013]

SUMMARY OF THE INVENTION The present invention provides
For such a problem, the upper corrugated vertical plate and the lower corrugated vertical plate do not necessarily have to be overlapped, and even if simple welding is performed by butting up and down, there is no difference in load carrying strength. The present inventors have found that the production cost of the member can be reduced and the construction can be facilitated, and the present invention has been completed. Hereinafter, each means for solving the above problems will be specifically described.

-Invention of Claim 1-In the invention of Claim 1, a pair of lower corrugated vertical plates, each of which is bent in a zig-zag shape and extends in the longitudinal direction of the seam, and in which concave and convex portions face each other, Similarly to each lower corrugated vertical plate, it is bent in a zigzag manner and extends in the longitudinal direction of the seam, the lower end thereof is butted to the upper end of the lower corrugated vertical plate so as to be flush with the lower corrugated vertical plate, and the butted portion is welded. And a pair of upper corrugated vertical plates that have been started up, and a gap between the lower corrugated vertical plate and the upper corrugated vertical plate forms a corrugated play, and the lower corrugated vertical plate and the upper corrugated vertical plate are also formed. Is a seam structure of a road bridge, characterized in that a concrete slab whose end surface is formed to be uneven by the upper corrugated vertical plate and the lower corrugated vertical plate is provided on the back part of.

In the present invention, since the upper and lower corrugated vertical plates are arranged flush with each other, the concrete plate on the back of these corrugated vertical plates is the same as the concrete plate formed on the back of the single corrugated vertical plate. Substantially unchanged, the load bearing strength is also high. And since it is not necessary to stack the upper and lower corrugated vertical plates on top of each other, short corrugated vertical plates can be used, which facilitates the production of the corrugated vertical plates. There is no need to adjust the pitch precisely, and construction is easy.

Here, the upper corrugated vertical plate and the lower corrugated vertical plate are arranged so as to be flush with each other.
It is not required that both corrugated vertical plates be completely flush with each other, but it is sufficient to dispose them so that they are substantially flush.
Then, the upper and lower corrugated vertical plates may be connected only by partially welding (butt welding) the abutting portions of each other.

The wave shape of the corrugated vertical plate is not limited to the trapezoidal wave shape as in the embodiment described later, but various shapes such as a rectangular wave shape, a sawtooth wave shape, and a sine curve shape can be adopted. Further, the seam portion of the road bridge includes a seam portion between the road bridge and the road bridge and a seam portion between the road bridge and the abutment. Road bridges are not limited to steel bridges, but include concrete bridges such as prestressed concrete girder bridges and reinforced concrete girder bridges. These points are the same in the following inventions unless otherwise specified.

-Invention of Claim 2- In the invention of Claim 2, in the seam structure of the road bridge described in Claim 1, the lower corrugated vertical shaft is provided at the lower end of each of the lower corrugated vertical plates. A bottom plate is fixed for each convex part of the plate, the bottom plate covering the lower surface of the back part of the convex part and having the rear surface flush with the rear surface of the concave part of the lower corrugated vertical plate. A vertical plate portion and a horizontal plate portion are connected to each other in an L shape on the back surface of the recess and the back surface of the bottom plate, and L extends continuously in the longitudinal direction of the seam so as to extend over the back surface of the recess and the back surface of the bottom plate.
The vertical plate portion of the shaped plate is joined, and the lateral plate portion of the L-shaped plate is joined to the steel girder.

In the present invention, since the bottom plate is provided for each convex portion of the lower corrugated vertical plate, and the bottom plates of the adjacent convex portions are not continuous with each other, the bottom plate can be easily manufactured. That is, when a continuous bottom plate is used between adjacent convex portions, it is necessary to form a corrugated side face, which is difficult to process, in a zigzag bend on the bottom plate in the same manner as the corrugated shape of the lower corrugated vertical plate. However, this is not necessary in the case of the invention,
The bottom plate can be easily manufactured. Further, in the case of the bottom plate which is continuous between the adjacent convex portions described above, there can be a gap between the vertical plate portion of the L-shaped plate and the lower corrugated vertical plate, and the lower corrugated vertical plate is the L-shaped plate by the distance. The overhang from the ground becomes large, which is disadvantageous in terms of load-bearing strength, but the present invention solves this problem.

Since the vertical plate portion of the L-shaped plate is joined to the rear surface of the concave portion of the lower corrugated vertical plate and the rear surface of the bottom plate, and the horizontal plate portion of the L-shaped plate is connected to the steel girder, the lower corrugated portion is formed. The vertical plate is firmly supported by the steel girder via the bottom plate and the L-shaped plate.
In particular, since the back surface of the concave portion of the lower corrugated vertical plate and the vertical plate portion of the L-shaped plate are directly coupled, the supporting strength of the lower corrugated vertical plate by the L-shaped plate becomes high. Moreover, the height of the upper corrugated vertical plate can be adjusted by adjusting the joint positions of the rear surface of the concave portion of the lower corrugated vertical plate and the rear surface of the bottom plate and the vertical plate portion of the L-shaped plate. It becomes easy to fit the upper end of the plate to the road surface.

-Invention of Claim 3- In the invention of Claim 3, in the joint structure of the road bridge described in Claim 1 or 2, the inner surfaces of the pair of upper corrugated vertical plates facing each other are provided. It is characterized in that a rubber seal material is baked and adhered to the.

In the case of the present invention, the rubber seal material is baked and adhered to the upper corrugated vertical plate, but since the upper corrugated vertical plate does not need to be tall, a large mold is not required.

-Invention of Claim 4- In the invention of Claim 4, a pair of upper corrugated vertical plates each bent in zigzag, and a pair of zigzag bent similarly to the upper corrugated vertical plate. A lower corrugated vertical plate is prepared, and the pair of upper corrugated vertical plates and the pair of lower corrugated vertical plates are connected to each other by abutting vertically so that they are flush with each other, and the pair of corrugated vertical plates is connected. At the seam of the road bridge, arrange so that the concave and convex parts face each other in the bridge length direction and the upper ends match the road surface height, and cast concrete on the back part of both of the connecting corrugated vertical plates. Is a method of constructing a joint structure of a road bridge.

In the present invention, the seam structure of the road bridge described in claim 1 can be constructed by using the short upper corrugated vertical plate and the lower corrugated vertical plate.

-Invention of Claim 5- In the invention of Claim 5, a pair of upper corrugated vertical plates each bent in a zigzag shape, and a pair of zigzag bent parts similar to the upper corrugated vertical plates. A lower corrugated vertical plate and a pair of L-shaped plates in which the vertical plate portion and the horizontal plate portion are connected in an L-shape are prepared, and at the lower end of the lower corrugated vertical plate, each convex portion is provided with a convex portion. A bottom plate that covers the lower surface of the back and is formed so that the back surface is flush with the back surface of the recess of the lower corrugated vertical plate is fixed, and at the seam portion of the road bridge, there is a gap between the opposite road edges. A notch step is formed by cutting off the upper part of the steel girder so that the upper surface of the end part is exposed, and the pair of upper corrugated vertical plates and the pair of lower corrugated vertical plates are abutted vertically so that they are flush with each other. In the connected state, the pair of connected corrugated vertical plates are connected to each other at the seam portion of the road bridge. Are arranged so that the recesses and the projections of the L-shaped plate face each other in the bridge length direction and the upper ends thereof match the height of the road surface. And the L
A method for constructing a seam structure of a road bridge, characterized in that a horizontal plate portion of a shaped plate is fixed to an upper surface of the steel girder, and concrete is placed on the back portions of the connected upper and lower corrugated vertical plates.

In the invention, the joint structure of the road bridge according to claim 2 can be constructed. And
Place the upper and lower corrugated vertical plates connected to each other so that the upper ends of the upper corrugated vertical plates match the height of the road surface, and then add L to the lower corrugated vertical plates.
Since the shaped plates are joined, it becomes easy to match the upper end of the upper corrugated vertical plate with the road surface height. That is, if the L-shaped plate fixed to the steel girder and the lower corrugated vertical plate are first connected, and then the upper corrugated vertical plate is connected to the lower corrugated vertical plate, the L-shaped plate and the lower corrugated vertical plate are previously connected. The upper end of the upper corrugated vertical plate does not coincide with the road surface unless the joining position of (1) is adjusted strictly, but according to the present invention, such inconvenience disappears.

[0027]

Therefore, according to the first aspect of the present invention,
Since the upper and lower corrugated vertical plates are butted up and down so that they are flush with each other and the butted portions are welded to start up, it is shorter than the conventional method of stacking the vertically corrugated vertical plates, and While using a corrugated vertical plate that does not require high dimensional accuracy and is easy to manufacture, it is possible to form a concrete slab with high load-bearing strength similar to the case where a conventional one-piece corrugated vertical plate is provided, Moreover, the effect that the construction is easy can be obtained.

According to the second aspect of the invention, an independent bottom plate is fixed to the lower end of the lower corrugated vertical plate for each convex portion thereof, and an L-shaped plate is provided on the rear surface of the concave portion of the lower corrugated vertical plate and the rear surface of the bottom plate. Since the vertical plate portion of the L-shaped plate is joined and the horizontal plate portion of the L-shaped plate is connected to the steel girder, the load-bearing strength of the concrete plate can be increased while facilitating the production of the bottom plate and the bottom member composed of the L-shaped plate. The height of the upper corrugated vertical plate can be adjusted and the material can be easily transported.

According to the third aspect of the present invention, the rubber seal material is baked and adhered to the upper corrugated vertical plate, but it is not necessary to make the upper corrugated vertical plate tall as described above. Since it is not necessary to use a large mold, the manufacturing cost can be reduced.

According to the fourth aspect of the present invention, a pair of upper corrugated vertical plates and a pair of lower corrugated vertical plates are prepared, and these are vertically butted and connected to each other. At the joint of the road bridge, the plates are arranged so that the recesses and protrusions face each other in the bridge length direction and the upper ends match the height of the road surface, and concrete is placed at the back of the connecting corrugated vertical plates. By doing so, the joint structure of the road bridge according to claim 1 can be constructed.

According to the invention of claim 5, a pair of upper corrugated vertical plates, a pair of lower corrugated vertical plates and a pair of L-shaped plates are prepared, and a bottom plate is fixed to the lower end of the lower corrugated vertical plates. In addition, a notch step is formed at the seam of the road bridge, and the pair of upper corrugated vertical plates and the pair of lower corrugated vertical plates are connected to each other, and the pair of connected corrugated vertical plates is connected to the road. In the joint portion of the bridge, the concave and convex portions are arranged so as to face each other in the bridge length direction and the upper ends thereof match the height of the road surface, and the lower corrugated vertical plate and the bottom plate are L-shaped vertical plates. The joints of the L-shaped plates are fixed together with the horizontal plate portions of the L-shaped plate fixed to the upper surface of the steel girder, and concrete is placed on the backs of the upper and lower corrugated vertical plates connected to each other. It is possible to construct a seam structure of the road bridge related to the above, and also to adjust the height of the upper corrugated vertical plate. Effect that it is easy.

[0032]

Embodiments of the present invention will be described below with reference to the drawings.

-Structure-In FIG. 1, 1 is an upper corrugated vertical plate, 2 is a lower corrugated vertical plate,
Reference numeral 3 denotes a steel girder, 4 denotes a concrete floor slab, and a wavy gap 6 is formed by a gap between a pair of upper corrugated vertical plates 1 and 1 and a gap between a pair of lower corrugated vertical plates 2 and 2. Further, concrete is cast on the backs of the upper corrugated vertical plates 1 and 1 and the lower corrugated vertical plates 2 and 2 to form concrete corrugated plates 9 and 9.

More specifically, the upper corrugated vertical plates 1 and 1 are bent in a zigzag shape as shown in FIG. 2 to extend in the longitudinal direction of the seam of the road bridge, and the concave portions and the convex portions thereof are opposed to each other. The corrugated clearance 6 is formed by the arrangement. As shown in FIG. 3, the lower corrugated vertical plates 2 and 2 are also bent in a zigzag manner and extended in the joint longitudinal direction in the same manner as the upper corrugated vertical plates 1 and 1, and the concave portions and the convex portions face each other. Are arranged so that the corrugated play 6 is formed.

That is, the upper and lower corrugated vertical plates 1 and 2 are arranged so as to be flush with each other, and the lower end of the upper corrugated vertical plate 1 and the upper end of the lower corrugated vertical plate 2 are abutted vertically, and the abutting portions are Partial spot welding (at multiple points in the longitudinal direction of the seam) is performed. Anchors 12 are protrudingly provided on the back surfaces of the upper and lower corrugated vertical plates 1 and 2, and the anchors 12 are embedded in the concrete uneven plate 9. Further, in the lower corrugated vertical plate 2, a bottom plate 5 is formed for each convex portion so as to cover the lower surface of the back portion of the convex portion and the back surface is flush with the rear surface of the concave portion of the lower corrugated vertical plate 2. Is fixed.

On the rear surface of the concave portion of the lower corrugated vertical plate 2 and the rear surface of the bottom plate 5, a vertical plate portion 14a and a horizontal plate portion 14b are connected in an L shape and extend in a straight line continuously in the longitudinal direction of the joint. The vertical plate portion 14a of the plate 14 is joined so as to cover the back surface of the recess and the back surface of the bottom plate 5. The horizontal plate portion 14b of the L-shaped plate 14 is connected to the upper flange of the steel girder 3 by a high strength bolt.

The concrete rugged plate 9 has an end surface made uneven by the upper and lower corrugated vertical plates 1 and 2.

Further, a rubber seal material 17 is interposed between the corrugated play 6 of the upper corrugated vertical plates 1 and 1, and both sides of the seal material 17 are provided on the inner surface of the upper corrugated vertical plates 1 and 1. It is baked and adhered. A filling material 18 made of sand, liquid rubber, or the like is filled inside the sealing material 17. Note that the sealing of the wavy gap 6 is performed only by pouring the liquid sealing rubber in place of the sealing material 17, or a sponge-like elastic body having a rectangular cross section is attached to the inner surface of the upper corrugated vertical plates 1, 1. You may make it seal. In FIG. 1, reference numeral 15 denotes a through bar extending in the longitudinal direction of the joint, and 19 denotes a pavement of the concrete floor slab 4.

-Construction Method- The construction method of the joint structure will be described with reference to an example in which a damaged existing joint member is replaced with the joint member of the above embodiment.

First, the upper corrugated vertical plates 1 and 1 and the bottom plate 5 which are assembled so that the concave portions and the convex portions face each other, the sealing material 17 is baked and adhered, and the anchors 12 are projected.
, And the lower corrugated vertical plates 2 and 2 on which the anchors 12 are projected are prepared. The upper and lower corrugated vertical plates 1 and 2 are connected in such a manner that the upper and lower corrugated vertical plates 1 and 2 are flush with each other. Note that this connection may be performed at the factory or at the construction site.

At the construction site, the concrete parts on both sides of the existing joint member that have been cast are cut off to remove the existing joint member, and the upper surface of the end portion of the steel girder 3 is placed on both sides of the steel girder play. An exposed notch step is formed. Then, the L-shaped plate 14,
Put 14 in.

The upper corrugated vertical plates 1 and 1 and the lower corrugated vertical plates 2 and 2 connected to each other are arranged in the center between the notched step portions. The both connecting corrugated vertical plates are temporarily attached to the lower surface of the hanging rod, and both ends of the hanging rod are supported on the upper surfaces of the pavements 19 and 19, and the hanging rod is provided with the notch. By installing on the step, the upper ends of the upper corrugated vertical plates 1 and 1 are matched with the road surface height.

The vertical plate portion 14a of the L-shaped plate 14 is joined to the rear surfaces of the recesses of the lower corrugated vertical plates 2 and the rear surface of the bottom plate 5, and the horizontal plate portion 14b of the L-shaped plate 14 is connected to the steel girder 3. Secure to the upper surface of the upper flange of. Then, concrete is cast on the back of the upper and lower corrugated vertical plates 1 and 2 to form the concavo-convex concrete plate 9.

When a road bridge is newly constructed, the formwork is arranged so that the cutout step is formed at the road joint, and the floor slab concrete is placed. And, a series of paving 19 is applied on the formwork. Then, a cut is made in the longitudinal direction of the seam with a concrete cutter on the pavement on both sides of the formwork, the pavement on the padding is crushed and removed by a concrete crusher, and the formwork is further removed. Form a part. The subsequent steps are the same as the case of replacing the existing joint member described above.

In the above embodiment, the concrete slab 9 is a single layer, but it may be formed in a two-layer structure of an upper layer and a lower layer, if necessary.

[Brief description of drawings]

FIG. 1 is a sectional view of a joint structure of a road bridge.

FIG. 2 is a plan view of an upper corrugated vertical plate and its anchor.

FIG. 3 is a plan view of a lower corrugated vertical plate and an L-shaped plate.

[Explanation of symbols]

 1 Upper corrugated vertical plate 2 Lower corrugated vertical plate 3 Steel girder 4 Floor slab 5 Bottom plate 6 Corrugated space 9 Concrete uneven plate 12 Anchor 14 L-shaped plate 14a Vertical plate part 14b Horizontal plate part 17 Rubber seal material 19 Pavement

Claims (5)

[Claims] 1. A pair of lower corrugated vertical plates each of which is bent in a zig-zag shape and extends in the longitudinal direction of the seam, and a concave portion and a convex portion of which are opposed to each other, and is bent in a zig-zag manner like the lower corrugated vertical plates. A pair of upper corrugated vertical plates that extend in the longitudinal direction of the seam and have their lower ends abutted against the upper ends of the lower corrugated vertical plates so as to be flush with the lower corrugated vertical plates and that the abutting portions are welded and raised. The upper corrugated vertical plate and the lower corrugated vertical plate are provided at the back of the lower corrugated vertical plate and the upper corrugated vertical plate, while the corrugated play is formed by the gap between the lower corrugated vertical plate and the upper corrugated vertical plate. A road bridge joint structure characterized by having a concrete slab with an uneven end surface. 2. The road bridge joint structure according to claim 1, wherein the lower end of each lower corrugated vertical plate is provided with a lower surface of a back portion of each convex part of the lower corrugated vertical plate. A bottom plate formed so as to cover and have a back surface flush with the back surface of the recess of the lower corrugated vertical plate is fixed, and the bottom plate and the horizontal plate are provided on the back surface of the recess of the lower corrugated vertical plate and the back surface of the bottom plate. The vertical plate portion of the L-shaped plate is joined to the plate portion in an L shape and extends linearly continuously in the longitudinal direction of the joint so as to extend over the back surface of the recess and the back surface of the bottom plate. The seam structure of a road bridge characterized in that the horizontal plate is connected to the steel girder. 3. The road bridge structure according to claim 1 or 2, wherein a rubber seal material is baked and adhered to the opposing inner surfaces of the pair of upper corrugated vertical plates. Bridge joint structure. 4. A pair of upper corrugated vertical plates each bent in zigzag, and a pair of lower corrugated vertical plates bent in zigzag similarly to the upper corrugated vertical plates are prepared. In a state where the vertical plates and the pair of lower corrugated vertical plates are butted up and down so as to be flush with each other and connected, the pair of connected corrugated vertical plates are connected to each other at the concave portion and the convex portion at the joint portion of the road bridge. Are arranged so that they face each other in the bridge length direction and the upper ends thereof match the height of the road surface, and concrete is placed on the backs of the above-mentioned connecting corrugated vertical plates, to construct a joint structure for a road bridge. 5. A pair of upper corrugated vertical plates each bent in zigzag, a pair of lower corrugated vertical plates bent in zigzag similarly to the upper corrugated vertical plate, a vertical plate part and a horizontal plate part. A pair of L-shaped plates connected in an L-shape, and the lower end of the lower corrugated vertical plate covers the lower surface of the back of the convex part for each convex part and the back surface of the lower corrugated vertical plate. The bottom plate, which is formed so as to be flush with the back surface of the recess, is fixed, and at the seam of the road bridge, the opposite road end with a gap is cut off so that the upper surface of the steel girder end is exposed. To form a notch step portion, and the pair of upper corrugated vertical plates and the pair of lower corrugated vertical plates are connected by butting up and down so as to be flush with each other, and the pair of corrugated vertical plates is connected. At the seam of the above-mentioned road bridge, make sure that the concave and convex parts face each other in the bridge length direction. The upper end of the L-shaped plate is arranged so that its upper end matches the height of the road surface, and the vertical plate portion of the L-shaped plate is joined to the rear surfaces of the recesses of the lower corrugated vertical plates and the rear surface of the bottom plate. A method for constructing a seam structure of a road bridge, which is fixed to the upper surface of the steel girder and concrete is placed on the backs of the upper and lower corrugated vertical plates connected to each other.