JPH08246409A - Joint section structure of highway bridge and constructing method thereof - Google Patents

Abstract

PURPOSE: To improve car driving properties by a method wherein a pair of corrugated vertical plates are disposed onto a closing material inserted into a floor-slab joint opening so as to form a corrugated joint opening, sheating boards are fixed onto the bottom plates of the vertical plates and concrete is placed onto the rear sections of the vertical plates. CONSTITUTION: Floor slabs 5 having step lowering sections 8 at end sections are disposed at the interval of a floor-slab joint opening 6. The upper sections of the floor-slab joint opening 6 and the step lowering sections 8 are filled with padding up to the extent of the height of the top face of a floor slab 5, a pavement 4 is executed onto the top face of the floor slab 5 and the padding, the pavement 4 on the padding is removed, and the padding is taken off. A joint-opening closing material 13 is inserted into the floor-slab joint opening 6 to close the joint opening 6. A pair of corrugated vertical plates 2 are fixed mutually to form a corrugated joint opening 1, corrugated forms 14 are fitted to the lower section of the joint opening 1, and the vertical plates 2 are placed on the joint-opening closing material 13 so that a bottom plate 15 is placed at the central section of the closing material 13 and recessed sections 2a are protruded to the outside from the closing material 13. Sheathing boards 16 are fastened onto the rears of the bottom plate 15. and concrete is placed onto the rear sections of the corrugated vertical plates 2, thus forming a concrete irregular slab 3.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a seam structure for a road bridge, a pair of corrugated vertical plates are formed in which zigzags are bent to extend in the longitudinal direction of the seam by forming a step-down part at the opposite road end with a floor slab space. A corrugated play is formed by standing up the concave and convex portions of each other at the seam portion so as to face each other, and a concrete concavo-convex plate is formed by placing concrete on the backs of both corrugated vertical plates. Is known (see Japanese Patent Publication No. 62-51324).

[0003] The convex portion of the concavo-convex concrete slab has a so-called cantilevered state in which the entire portion from the base end to the tip protruding from the floor slab protrudes above the floor slab while floating from the bottom surface of the step-down portion. Has become. Further, in order to form a concrete uneven plate in which such projections are completely lifted, the corrugated vertical plate has a bottom plate fixed to the entire lower surface of the projection, and is cast into the step-down portion. A weir plate is fixed to the back surface of the bottom plate so that the concreted concrete does not enter below the bottom plate.

In recent years, a road bridge having a thick floor 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. As described above, a heavy load vehicle travels on a road bridge having a thick floor slab and a large load-bearing strength. It is necessary to improve the strength.

[0005] 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,
Since the concrete slab becomes thicker, its load bearing strength increases.

Japanese Patent Publication No. Sho 60-17883 discloses that 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. Proposals for forming thick concrete reliefs are described.

[0007]

However, of the former two prior arts, the former method in which the bottom plate is fixed to a steel girder and the corrugated vertical plate is raised can be adopted for a steel bridge. Also concrete bridge without steel girder (RC bridge, PC
Bridge) cannot be adopted. Further, even if this method is adopted for a steel bridge, there is a problem that it is difficult to adjust the upper end of the corrugated vertical plate to the road surface height. That is, the floor slab thickness of the road bridge is not formed to have a constant thickness over the entire length of the road width, and for example, in the relationship of creating a transverse gradient on the road surface, for example, the central portion of the width is thick and both ends are thin, and When concrete is placed, the thickness may be slightly thicker or thinner than the designed thickness, and the camber return of the girder may not be as designed and the height of the floor slab may be distorted.

Therefore, it is necessary to manufacture the corrugated vertical board each time according to the thickness of the floor slab of each road joint, and
It is necessary to prepare many corrugated vertical plates having different heights. Further, it is also difficult to manufacture such a tall corrugated vertical plate by bending a flat plate. 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.

On the other hand, in the case of the latter proposal, since the upper corrugated vertical plate and the lower corrugated vertical plate which are relatively low in height are used, the manufacturing difficulty is reduced and the upper and lower corrugated vertical plates are The total height can be adjusted by changing the overlapping amount, but there are problems that the number of parts increases and the cost increases, and it is difficult to overlap 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 superimposed, and it is necessary to have high dimensional accuracy. However, it is extremely difficult to actually manufacture 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.

Accordingly, the present invention provides a joint structure of a road bridge and a method of constructing the joint, which can solve such a problem.

[0012]

Means for Solving the Problem and Its Action The present inventor has responded to such problems by providing a corrugated concrete slab in a cantilever state in which a corrugated vertical plate is provided and a projection is projected between the floor slabs. It was formed in order to form a corrugated clearance to improve the running performance of the vehicle, and the entire projection from the base end to the tip of the convex portion of the concrete relief plate is floated and projected above the floor clearance. The reason for this is to avoid interference between the tip of this convex portion and the supporting portion (floor slab or abutment) of the other side of the concrete rugged plate. Even if it does not project, that is, by only floating and projecting only the portion on the tip side of the convex portion, the corrugated gap is formed at the joint portion of the road bridge while avoiding the above interference, and the desired vehicle running property is obtained. It is possible to reduce the cantilever amount of the above convex portion. Onsets saw that load-bearing strength of the concrete irregularities version is increased by Rukoto, which has led to the completion of the present invention. Hereinafter, each means for solving the above problems will be specifically described.

<Invention according to claim 1> The present invention is formed at each of opposite road ends with a seam gap of a road bridge, and has a bottom surface lower than the road surface and a side surface retreated from the seam space. The stepped portion and the convex portion are alternately bent in a zigzag manner toward the stepped portion toward the seam gap so that each convex portion is disposed on the stepped portion and the concave portion is disposed on the stepped portion. And a pair of corrugated vertical plates arranged with their concave and convex surfaces facing each other so as to form a corrugated space, and concrete is formed by driving the back of both corrugated vertical plates to the height of the road surface. Each of the bases is supported on the bottom surface of the step-down portion, and a plurality of convex portions arranged in the longitudinal direction of the seam at the pitch of the waves of the corrugated vertical plate are provided with a concrete uneven plate formed on the seam gap. In the joint structure of the road bridge, The convex portion of the concrete slab has a thickness comparable to the depth of the step-down portion, and a thick-walled projection portion protruding above the seam gap from the step-down portion, followed by the thick-walled projection portion. A protruding tip protruding forward so that the lower surface is higher than the lower surface of the thick protrusion, and the corrugated vertical plate is formed at a height comparable to the height of the protruding tip. A bottom plate that covers the lower surface of the tip protruding portion is fixed to the lower end of each convex portion of the corrugated vertical plate.

Therefore, in the present invention, the convex portion of the concrete slab is not entirely raised, and the base end portion is directly supported by the bottom surface of the step-down portion. The degree of holding and supporting is reduced, which is advantageous in securing the load bearing strength. Moreover,
The entire protrusion, which protrudes during the seam play, is not entirely lifted, but a part of the protrusion, that is, the thick protrusion has a thickness equivalent to the depth of the step-down portion, and has a base portion of the concrete uneven plate. Since it is thick as in the case of, it is advantageous for securing the load bearing strength.

In this way, the tip of the protruding portion protruding between the seams of the convex portion is also lifted up from the bottom surface of the step lowering part together with the bottom plate of the corrugated vertical plate, so that the seam clearance is narrowed by the extension of the road bridge. However, the corrugated vertical plate or the convex portion does not interfere with the end portion of the step-down portion of the road on the other side.

Further, the bottom plate of the corrugated vertical plate has a function of supporting the tip protruding portion of the concrete uneven plate, thereby contributing to an improvement in the load-bearing strength of the protruding portion and preventing the deformation of the protruding portion of the corrugated vertical plate. Serves as a reinforcement.

Here, in the present invention, the road edge is defined as
It includes the end of the slab of the road bridge and the abutment, and thus the seam play includes the seam between the slab and the slab, and the seam between the slab and the abutment. The floor slab includes a slab supported on a steel girder of a steel bridge and a girder or a girder slab of a PC bridge or an RC bridge.

Further, the corrugated vertical plate is not limited to a trapezoidal wave shape as in the embodiment described later, and various wave shapes such as a rectangular wave shape, a sine curve shape, and a sawtooth wave shape can be adopted.

According to a second aspect of the present invention, there is provided a method for constructing a joint structure of a road bridge according to the first aspect of the present invention, comprising: Are formed with stepped portions each having a bottom surface lower than the road surface and a side surface retreated from the seam gap, and a gap between the seam gaps that extends linearly in the seam longitudinal direction is inserted to close the seam gap. And at the same time, the upper surface of the play closing member is formed flush with the bottom surface of the step-down portion, and a pair of corrugated vertical plates each bent in a zig-sag and extending in the longitudinal direction of the joint form a concave surface with each other so as to form a corrugated play. A bottom plate is disposed so as to face the convex surface, and a bottom plate that covers the lower surface of the back of the tip is fixed to the lower end of the tip of each projection of each corrugated vertical plate. The zigzag bent corrugated formwork is fitted, and the corrugated formwork A joint member having a portion protruding downward from the corrugated vertical plate is provided on the clearance plug, the bottom plate is disposed at the center in the width direction of the clearance plug, and the concave portion of the corrugated vertical plate is closed on the clearance. A dam plate is placed on the back of the bottom plate to prevent intrusion of concrete from the step-down portion between the bottom plate and the play plug. By pouring concrete to the height of the road surface on the back of the vertical plate, each base is supported on the bottom surface of the step-down portion, and the plurality of convex portions arranged in the seam longitudinal direction at the wave pitch of the corrugated vertical plate are The thick protrusion protruding above the seam gap, having a thickness comparable to the depth of the stepped portion, and projecting above the seam gap from the stepped portion, Then project forward and the lower surface is higher than the lower surface of the thick protrusion. And forming a concrete uneven plate and lifted end projecting portion is formed so.

According to the present invention, when concrete is placed on the back of the corrugated vertical plate with the above-mentioned configuration, the concrete is prevented from entering the joint gap by the inter-blocking material, and the corrugated form is used by the corrugated formwork. Of the bottom plate is prevented by the weir plate. And since the upper surface of the play closing member and the bottom surface of the step-down portion are formed flush with each other, it has a thickness equivalent to the depth of the step-down portion and protrudes from the step-down portion during the seam play. A thick protrusion can be formed. Further, since the bottom plate is arranged in the central portion in the width direction of the loose block and the concave portion of the corrugated vertical plate is arranged outside the loose block, the bottom plate projects forward following the thick projecting part and has a lower surface. It is possible to form a protruding tip protrusion so as to be located at a position higher than the lower surface of the thick protrusion, and a stepped portion at the end of the road is a recess that receives the tip protrusion of the other side when the road is extended. Can be formed.

In the present invention, the upper surface of the play blocker and the bottom surface of the step-down portion are formed flush with each other, but the flushness in this case requires flushness in a strict sense. If it is possible to form a thick protruding portion having a thickness comparable to the depth of the step-down portion, a slight difference in height does not matter.

<Invention of Claim 3> The present invention is a method for constructing a seam structure of a road bridge according to claim 1, wherein the road ends are opposed to each other with a seam clearance of the road bridge. A step-down portion having a bottom surface lower than the road surface and a side surface receding from the seam gap, and a space closing member linearly extending in the longitudinal direction of the seam is inserted between the seam spaces to close the seam spaces. However, a pair of corrugated vertical plates bent in zigzags and extending in the longitudinal direction of the seam are disposed with their concave and convex surfaces facing each other so as to form a corrugated play, and the tips of the convex portions of each corrugated vertical plate. A bottom plate that covers the lower surface of the back of the tip is fixed to the lower end of the corrugated part, and a corrugated form bent in a zigzag pattern is fitted to the lower part of the corrugated play, and the lower part of the corrugated form is fitted to the corrugated form. Install the joint member that protrudes downward from the vertical plate On the closing member, the bottom plate is placed at the center in the width direction of the free closing member, and the concave portion of the corrugated vertical plate is placed so as to be disposed outside the free closing member. By filling the concrete with the bottom plate so that concrete does not enter from the step, the concrete is poured into the back of both corrugated vertical plates to the height of the road surface, so that each base is on the bottom of the step. Supported, a plurality of protrusions arranged in the seam longitudinal direction at the pitch of the wave of the corrugated vertical plate project above the gap between the seams, and the protrusions have a thickness equivalent to the depth of the step-down portion. A thick protruding portion protruding above the gap between the stepped portion and a tip protruding portion protruding forward following the thick protruding portion so that a lower surface thereof is higher than a lower surface of the thick protruding portion; Forming a concave and convex concrete slab in which To.

According to the present invention, with the above-mentioned structure, the filling provided between the bottom plate of the corrugated vertical plate and the loose block prevents the invasion of concrete below the bottom plate. This is similar to the invention according to claim 2.

[0024]

According to the invention of claim 1, the entire convex portion of the concrete relief plate is not raised, and only the tip portion of the protruding portion protruding between the seams of the convex portion is further provided. Since it is lifted from the bottom surface of the step-down portion, the load-bearing strength of the convex portion of the concrete relief plate is high, and moreover, the bottom plate is provided at the tip of the convex portion of the corrugated vertical plate. In addition to being more advantageous for improving strength, the corrugated vertical plate can be reinforced,
It is possible to improve the durability of the road bridge joint while obtaining good vehicle running performance due to the corrugated clearance.

According to the invention of claim 2, the gap between the concrete and the bottom plate prevents the concrete from entering the gap between the joints, and the gap between the concrete and the bottom of the bottom plate. While preventing the intrusion of the concrete, the concrete slab has a thickness comparable to the depth of the step-down portion, and the thick protrusion protruding from the step-down portion onto the seam gap, It is possible to form a projection having a front end protruding so that the lower surface protrudes forward so that the lower surface is higher than the lower surface of the thick protrusion.

According to the third aspect of the invention, the padding serves as a substitute for the weir plate in the second aspect of the invention, and the same effect as that of the second aspect of the invention can be obtained.

[0027]

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

<Embodiment 1> -Structure- In the joint structure of the road bridge shown in FIGS. 1 to 3, reference numeral 1 denotes a corrugated space formed by a pair of corrugated vertical plates 2;
Is a concrete uneven plate formed by casting concrete on the back of each corrugated vertical plate 2, 4 is a pavement following the back of the concrete uneven plate 3, 5 is a floor slab (or abutment), 6 is a floor slab (seam). 8) is the bottom surface lower than the road surface and the floor slab 6
This is a stepped-down portion having a more retreated side surface.

The corrugated vertical plate 2 is a vertical plate which is bent in a zigzag manner and extends in the longitudinal direction of the seam, and its convex portion 2b is disposed on the play closing member 13 interposed in the floor play 6. And the recess 2a protrudes outside of the play closing member 13. In other words, the corrugated vertical plates 2 and 2 are alternately moved to the floor slab 6 side so that the convex portions 2b are arranged in the floor slab 6 and the concave portions 2a are arranged on the step-down portions 8. The wavy gap 1 is bent in a zigzag manner toward the step-down portion 8 and extends in the longitudinal direction of the seam, and the concave face and the convex face are arranged to face each other so as to form a wavy gap.
Is formed.

The play closing member 13 is made of urethane foam and extends linearly in the longitudinal direction of the seam. The play closing member 13 is inserted into the play slab 6 so as to close the play slab 6, and has an upper surface. The stepped portion 8 is formed flush with the bottom surface. Below the wavy gap 1 of the pair of wavy vertical plates 2 and 2 is fitted a wavy formwork 14 made of urethane foam bent zigzag following the wavy gap 1. The corrugated formwork 14 is placed on the upper surface of the flush plug 13 and the bottom surface of the step-down portion 8, the lower part of which protrudes downward from the corrugated vertical plate 2 and is flush with the corrugated vertical plate 2. The play closing member 13 and the corrugated formwork 14 can be formed of other materials as long as they have compressibility.

A bottom plate 15 is fixed to the lower end of the tip of each convex portion 2b of the corrugated vertical plate 2 so as to cover the lower surface of the back of the tip. A weir plate 16 for preventing concrete from entering between the bottom plate 15 and the play block member 13 is fixed. in this case,
The bottom plate 15 is arranged at a substantially central portion of the inter-lobe blocking member 13.

The concrete concavo-convex plate 3 is formed by placing concrete on the back portion of the corrugated vertical plate 2, and the corrugated vertical plate 2 bends zigzag to extend in the longitudinal direction of the seam. The surface is formed. That is, the concrete uneven plate 3 has a base portion supported on the bottom surface of the step-down portion 3 and arranged in the seam longitudinal direction at the pitch of the wave of the corrugated vertical plate 2 to project into the floor slab space 6. It is equipped with 7.

The convex portion 7 has a base end portion disposed on the step-down portion 8 and a thickness comparable to the depth of the step-down portion 8, and the step-down portion 8 causes the floor to rise. A thick protruding portion 7a protruding into the plate play space 6 and a tip protruding portion 7b protruding forward from the thick protruding portion 7a so that the lower surface is higher than the lower surface of the thick protruding portion 7a. It is composed by.

A seal member 9 is interposed in the corrugated space 1, and both side portions of the seal member 9 are fixed to the inner surfaces of the corrugated vertical plates 2, 2. The inside of the seal member 9 may be filled with a filler such as sand or liquid rubber. Various methods such as sealing the wavy gap 1 only by pouring of liquid sealing rubber in place of the sealing member 9 and attaching a sponge-like elastic body having a rectangular cross section to the inner surfaces of the corrugated vertical plates 2 are used. The seal may be performed by using the above method.

An anchor 11 protrudes from the back of the corrugated vertical plate 2 and is embedded in the concavo-convex concrete plate 3. In FIG. 3, the illustration of a seal member and an anchor described later is omitted.

-Construction method- The construction of the joint structure can be performed as follows.

At the factory, the pair of corrugated vertical plates 2, 2
Are connected by a seal member 9, and an anchor 11 is provided on the back surface of each corrugated vertical plate 2. Corrugated vertical plate 2,
2, the concave portions 2a and the convex portions 2b are opposed to each other to form the corrugated gap 1. In addition, the corrugated vertical plate 2 has a bottom plate 1
5 is fixed.

When a new road bridge is to be constructed, the floor slab 5 having a stepped-down portion 8 for forming the concavo-convex concrete slab 3 at the end is formed by removing the box during the construction of the floor slab concrete. .

Next, padding is carried out to the height of the upper surface of the floor slab 5 on the floor slab 6 and the step-down portions 8, 8, and the pavement 4 is successively applied on the upper surface of the floor slab 5 and the padding.

On both sides of the padding, a cut is made in the pavement in the longitudinal direction of the seam by a concrete cutter, and the pavement on the padding is crushed and removed by a concrete crusher, and the padding is further removed.

A play closing member 13 is inserted into the play space 6 to close the play space 6. At this time, the upper surface of the play closing member 13 is flush with the bottom surface of the step-down portion 8.

The corrugated vertical plates 2 and 2 are fixed to each other so as to form a predetermined corrugated play 1, and a corrugated form 14 is fitted under the corrugated play 1 and placed on the play blocking member 13. At that time, the amount of downward projection of the corrugated form 14 from the corrugated vertical plates 2 and 2 is increased, and the total height of the corrugated vertical plate 2 and the corrugated form 14 is made larger than the depth of the step-down portion 8. I do. Further, the bottom plate 15 of the corrugated vertical plate 2 is disposed at the center of the play closing member 13, and the concave portion 2a protrudes outside the play closing member 13 (see FIGS. 1 and 3).

Then, the corrugated vertical plates 2 and 2 are pushed down so that the upper ends thereof coincide with the road surface height. At that time, the corrugated form 1
4 goes deeply between the corrugated vertical plates 2 and 2. Next, the weir plate 16 is fixed to the back surface of the bottom plate 15 of the corrugated vertical plate 2. Then, concrete is cast on the back of the corrugated vertical plate 2 to the height of the road surface to form the concrete relief plate 3.

-Function / Effect- Accordingly, in the above embodiment, the concrete cast on the back of the corrugated vertical plate 2 is prevented from entering the floor gaps 6 by the gap closing members 13, and the corrugated formwork 14 is formed. Thus, the invasion below the wave gap 1 is prevented, and the invasion below the bottom plate 15 is prevented by the weir plate 16. Further, since the corrugated play 1 which opens to the road surface is formed at the joint portion by the pair of corrugated vertical plates 2 and 2, good vehicle running performance is obtained.

The convex portion 7 of the concrete uneven plate 3 is
The base end portion is directly supported by the floor slab 5, and the portion protruding into the floor slab 6 also has only the bottom surface of the tip protrusion 7b raised, and the thick protrusion 7a is similar to the base end. Because it will be as thick as the depth of the stepped part 8
Its load bearing strength is high. Moreover, as described above, since the bottom surface of the tip projecting portion 7b is raised, there is no interference between the projecting portion of the concavo-convex concrete plate 3 and the end of the step-down portion 8 on the other side.

When replacing an existing joint or increasing the thickness of an existing road bridge, the existing joint member is removed and a step-down portion is formed at the end of the road bridge. In the same manner as in the above case, concrete is cast on the back of the corrugated vertical plate 2 to form the concavo-convex concrete plate 3.

In the above embodiment, the concrete slab 3 is a single layer, but the lower part of the concrete slab is formed by a cement concrete layer, and the same asphalt concrete pavement as the pavement 4 is formed on the cement concrete layer. In other words, the concrete uneven plate may be formed in two layers.

<Embodiment 2> This embodiment is shown in FIG. 4 and FIG.
A padding 17 is used in place of the weir plate 16 in the first embodiment. That is, as in the case of the first embodiment, the insertion of the gap closing member 13 into the floor gap 6, the fitting of the corrugated form 14 into the corrugated gap 1 of the corrugated vertical plates 2, 2, the gap closing member 1
3 and after the heights of the upper ends of the corrugated vertical plates 2 and 2 are adjusted, the padding 17 is provided between the idle block member 13 and the bottom plate 15 so that concrete does not enter from the step-down portion 8. After that, concrete is cast on the back of the corrugated vertical plate 2 to the height of the road surface to form the concrete relief plate 3. As the material of the padding 17, the same material as that of the play closing member 13 or the corrugated form 14 can be employed.

<Embodiment 3> In this embodiment, only the main part is shown in FIG. 6, and the construction method is characterized. That is, Example 1
In this case, the loose block 13, corrugated frame 14 and dam plate 16 were used for concrete construction, but in this example, the corrugated frame 14 is used.
It is characterized in that a corrugated weir plate 21 is used instead of the weir plate 16. The corrugated dam plate 21 is formed by bending along the back surface of the bottom plate 7 and the back surface of the recess 2 a of the corrugated vertical plate 2.

Therefore, during concrete construction, the pair of corrugated vertical plates 2 and 2 connected by the seal member 9 are suspended so that the upper ends thereof are adapted to the road surface height, and the corrugated weir plate 21 is attached to the back of the corrugated vertical plate 2. And concrete is poured into the back of the corrugated vertical plate 2 in that state. Therefore, in the case of this example, since the corrugated frame 14 becomes unnecessary, the construction is facilitated.

The weir plate 21 is formed in a corrugated shape in advance, and includes a portion 21a extending in the longitudinal direction of the seam on the back surface of the bottom plate, and a portion 21b extending in the longitudinal direction of the seam on the back surface of the concave portion of the corrugated vertical plate 2. You may use the partition type dam board in which the inclination part 21c which inclines and inclines with respect to the joint longitudinal direction was mutually formed separately. Further, a portion (21c, 21b, 21c) along the corrugated vertical plate 2 and a portion 21a along the back surface of the bottom plate may be separate from each other.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a joint portion of a road bridge according to a first embodiment.

FIG. 2 is a cross-sectional view of a joint portion of the road bridge of the same example.

FIG. 3 is a perspective view of a joint portion of a road bridge showing a state before concrete construction of the same example in a partial cross section.

FIG. 4 is a partially cutaway plan view of a joint of a road bridge according to a second embodiment.

FIG. 5 is a cross-sectional view of a joint portion of the same road bridge.

FIG. 6 is a perspective view showing, in partial cross section, a seam portion of a road bridge before concrete construction according to a third embodiment.

[Explanation of symbols]

 1 corrugated play space 2 corrugated vertical plate 2a concave part 2b convex part 3 concrete uneven plate 4 pavement 5 floor slab 6 floor plate free space 7 convex part of concrete uneven plate 7a thick protruding part 7b tip protruding part 8 step lowering part 13 free space blocking material 14 Corrugated form 15 Bottom plate 16 Weir plate 17 Padding 21 Corrugated weir plate

Claims (3)

[Claims] 1. A step-down portion which is formed at each of opposite road end portions with a seam gap of a road bridge and has a bottom surface lower than the road surface and a side surface receding from the seam gap, and each convex portion Zigzags are alternately bent toward the seam gap side toward the step lower part side to extend in the longitudinal direction of the seam so as to form a wavy gap so that the concave portion is arranged on the seam gap and is arranged on the step lower portion. A pair of corrugated vertical plates are arranged such that their concave and convex surfaces are opposed to each other, and a concrete is cast on the backs of both corrugated vertical plates to the height of the road surface. In the seam structure of a road bridge, which is supported on the bottom surface of the corrugated vertical plate, and has a plurality of convex portions arranged in the longitudinal direction of the seam at the pitch of the wave of the corrugated vertical plate and protruding above the seam gap, On the convex part of the relief plate, A thick protruding portion having a thickness equivalent to the depth of the stepped-down portion and protruding from the stepped portion above the gap between the joints; A protruding tip portion raised so as to be higher than the lower surface of the portion, the corrugated vertical plate is formed at a height equivalent to the height of the tip protruding portion, and each convex portion of the corrugated vertical plate is formed. A bottom plate for covering a lower surface of the tip protrusion is fixed to a lower end of the joint. 2. A stepped portion having a bottom surface lower than the road surface and a side surface retreated from the seam gap is formed at each of the road ends facing each other with a seam gap of the road bridge therebetween, and the seam gap is formed between the seam gaps. The gap between the joints is closed by inserting a gap closing member extending linearly in the longitudinal direction, and the upper surface of the gap closing member is formed flush with the bottom surface of the step-down portion. A pair of corrugated vertical plates extending in the direction are disposed with their concave and convex surfaces facing each other so as to form a corrugated space, and the lower end of the distal end of each convex portion of each corrugated vertical plate has The bottom plate covering the lower surface is fixed,
A corrugated formwork bent in a zigzag manner is fitted to the lower part of the corrugated space, and a joint member having a lower part of the corrugated form protruding downward from the corrugated vertical plate is attached to the upper part of the corrugated closing member. The bottom plate is placed at the center in the width direction of the play obstruction material, and the concave portion of the corrugated vertical plate is placed outside the play obstruction material, and the step-down portion is provided on the back surface of the bottom plate. A dam plate for preventing concrete from entering between the bottom plate and the play closing member from above, and placing concrete up to the road surface height on the back of the two corrugated vertical plates, so that each base has the step A plurality of projections supported on the bottom of the lowering portion and arranged in the longitudinal direction of the seam at the pitch of the waves of the corrugated vertical plate project above the seam gap, and on the projections,
A thick-walled projection having a thickness comparable to the depth of the stepped-down portion and projecting above the seam clearance from the stepped-down portion, and a front surface projecting forward from the thick-walled projection and the lower surface of the thick-walled projection. A method for constructing a seam structure of a road bridge, which comprises forming a concrete relief plate having a protruding tip protruding so as to be located at a position higher than the lower surface of the section. 3. A step-down portion having a bottom surface lower than the road surface and a side surface retreated from the seam gap is formed at each of the road ends facing each other with a seam gap of the road bridge, and the seam gap is formed between the seam gaps. The gap between the seams is closed by inserting a gap between the gaps extending linearly in the longitudinal direction, and a pair of corrugated vertical plates each bent in a zigsag and extending in the longitudinal direction of the joint form a concave surface and a convex surface so as to form a wave gap. Are disposed facing each other, and a bottom plate that covers the lower surface of the back of the tip is fixed to the lower end of the tip of each projection of each corrugated vertical plate,
A corrugated form that is bent in a zigzag pattern is fitted to the lower part of the corrugated play, and a joint member in which the lower part of the corrugated form projects downward from the corrugated vertical plate, The bottom plate is placed in the widthwise central portion of the play block and the recess of the corrugated vertical plate is placed outside the play block, and between the play block and the bottom plate. Filling to prevent concrete from entering from the step-down part, and by driving concrete to the road surface height on the back part of both corrugated vertical plates, each base is supported on the bottom surface of the step-down part, A plurality of convex portions lined up in the seam longitudinal direction at the wave pitch of the corrugated vertical plate protrudes above the seam gap, and in the convex portion,
A thick-walled projection having a thickness comparable to the depth of the stepped-down portion and projecting above the seam clearance from the stepped-down portion, and a front surface projecting forward from the thick-walled projection and the lower surface of the thick-walled projection. A method for constructing a seam structure of a road bridge, which comprises forming a concrete relief plate having a protruding tip protruding so as to be located at a position higher than the lower surface of the section.