JP2003206506A - Structure of road bridge joint part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the occurrence of crack in continuous pavement in a road bridge joint part. <P>SOLUTION: Step parts 10, 10 are formed in road bridge main bodies 1, 1 on both sides of an expansion gap 2, a flexible plate 8 having a plurality of fiber sheets is provided on the step parts 10, 10 across the expansion gap 2, and continuous pavements 12, 14 are formed on the flexible plate 8. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blind bridge type road bridge joint structure.

[0002]

2. Description of the Related Art The blind joint type is mainly applied to a road bridge having a relatively small amount of expansion and contraction, and is known to absorb expansion and contraction of a road bridge body by deformation of a paving material continuously paved. Its basic structure is shown in FIG. That is, on both sides of the road bridge play space a, a step c is formed at the end of the road bridge body b, and the joint material d is filled in the play space a.
An elastic compound e is placed on the steps c, c so as to cover the joint material d, and a waterproof sheet f is laid on the elastic compound e.
Pavement g is applied on it.

[0003]

According to the above blind type, since the pavement is continuous at the road bridge joint without interruption, the running performance of the automobile is good and vibration and noise are reduced, but the elastic compound is used. There is a problem that the pavement becomes wavy due to the flow of e, or the pavement on the open space is likely to crack due to the relative vertical displacement of the road bridge body that faces the open space and the expansion and contraction of the road bridge body. is there. These cracks extend in the longitudinal direction of the clearance (the direction intersecting the bridge axis), which deteriorates the running performance of the automobile. In addition, the pavement will be chipped from the cracks due to the impact when passing through the car, and the cracks will gradually become larger grooves and the running performance will worsen, and noise and vibration will increase.
Driving safety is also compromised.

On the other hand, there is a proposal that the pavement has a two-layer structure of a base layer and a surface layer, and a bituminous sheet is provided between the base layer and the road bridge body, and between the base layer and the surface layer. Is low.

The elastic compound e is made of rubber,
It is formed by a mixture of asphalt and crushed stone, but at the time of construction, the required amount of rubber and asphalt (or sheet-shaped rubber-containing asphalt) is heated and melted in a melting tank at the site, and this melt is further mixed with crushed stone. It is necessary to put it in the mixer and mix again by heating,
Preparation on site is troublesome, and it takes time and effort. Further, even after being cast on the step c, the waterproof sheet f cannot be installed and the paving g cannot be performed until the elastic compound e is cooled and solidified. For this reason, the construction time becomes long and the construction cannot be completed by only one night construction or daytime construction, and the construction is interrupted in the early morning or the evening,
You have to temporarily pack asphalt mix for the thickness of the pavement, cover the road bridge joints with a lining plate to temporarily restore it (enable road traffic), and then do the following construction again the next night or noon. Disappear. Therefore, the period of traffic regulation for construction will be doubled, which will increase the cost and hinder traffic safety.

An object of the present invention is to suppress the occurrence of cracks in the pavement in such a blind road type road bridge joint structure. Another object of the present invention is to reduce the construction time and the construction cost.

[0007]

In order to solve the above problems, the present invention continuously paves a pre-manufactured room temperature flexible plate which is made by embedding a fiber sheet instead of an elastic compound. It was set up below.

That is, the invention according to claim 1 is a blind bridge type road bridge seam structure which is continuously paved so as to cover the free space of the road bridge seam, wherein Alternatively, a step portion lower than the upper surface of the road bridge body is formed on the road bridge body and abutment on both sides of the play space, and a flexible plate is provided so as to straddle the step portions on both sides of the play space, and the flexible plate is A continuous fiber sheet is integrally provided from the one step portion to the other step portion, and continuous pavement is performed on the flexible plate.

With such a road bridge joint structure, the problem of pavement waving due to the flow of the elastic compound as in the conventional case can be solved. In addition, even if relative vertical displacement occurs between the road bridge main bodies (or between the road bridge main body and the abutment) facing each other with a gap between them, the flexible plate tilts in response to the vertical displacement. , Suppress cracking of pavement. Also, when the play space expands as the road bridge body expands and contracts, a large tensile force acts on the flexible plate, but since the flexible plate is reinforced by the fiber sheet, breakage is avoided and cracks in the pavement are avoided. Exhibits a preventive effect over a long period of time.

[0010] In addition, when constructing the flexible plate, it is not necessary to perform the heating and mixing work in the field unlike the conventional elastic compound, and immediately after constructing the flexible plate on the step portion, the pavement construction can be started. As a result, the construction can be completed in a short time, which is advantageous for preventing traffic accidents and reducing construction costs.

The flexible plate can be made of rubber, asphalt (bituminous material), asphalt with rubber, or synthetic resin.

As the above fiber sheet, one having long fibers extending in the bridge axis direction is preferable in terms of strength and durability.
As long fibers, glass fibers, inorganic fibers such as carbon fibers,
Synthetic fibers or natural fibers can be used. Further, the number of the fibrous sheets may be one, or a plurality of the fibrous sheets may be vertically stacked and embedded, or may be vertically spaced and embedded. Also, the fiber sheet is embedded in a flexible plate,
It may be provided on the front surface or the back surface of the flexible plate by adhesion.

The depth of the step from the upper surface of the road bridge body is 5
It is preferable to set it to mm or more. In that case, the flexible plate is made of rubber, on the upper surface side or the lower surface side, or in the middle part.
Forming an elastic layer (not including a fiber sheet) having a thickness of 2 mm or more, preferably 2.5 mm or more, and more preferably 3 mm or more, which is formed of asphalt (bituminous material), rubber-containing asphalt or synthetic resin It is advantageous in terms of crack prevention. The upper surface of the flexible plate may be lower than the upper surface of the road bridge body.

According to a second aspect of the present invention, in the road bridge joint structure according to the first aspect, the flexible plate has:
A plurality of continuous fibrous sheets are embedded vertically from one step to the other step, and the fibrous sheet arranged on the upper side and the fibrous sheet arranged on the lower side are the above-mentioned gaps. It is characterized in that the amount of spread from the bridge to the outside in the axial direction of the bridge is different from each other.

In such a road bridge joint structure, an external force caused by the expansion / contraction change of the play and the vertical displacement of the end portion of the road bridge body acts on the flexible plate. The resistance of each of the sheets prevents cracking of the pavement in corresponding areas of play.

[0016] Thus, in the flexible plate, since the fibrous sheets arranged above and below are different from each other in the amount of spread from the clearance to the outside in the bridge axis direction, the strength is not uniform over the entire width in the bridge axis direction. Absent. Therefore, in the flexible plate, the stress concentration due to the expansion change of the play and the vertical displacement of the end of the road bridge main body is dispersed and appears at multiple points in the bridge axis direction. Even if you reduce
It is possible to secure the proof stress of the flexible plate itself, and it is possible to avoid stress concentration on the boundary between the road bridge body or abutment and the flexible plate. Therefore, it is possible to prevent the pavement from cracking at a portion corresponding to this boundary.

The fibrous sheets arranged above and below are formed such that only one side of the fibrous sheets is different from each other in the amount of expansion from the play space to the outside in the bridge axis direction, and on both sides of each fibrous sheet from the play space to the outside in the bridge axis direction. In some cases, they may be formed so that the spread amounts thereof are different from each other.

According to a third aspect of the present invention, in the road bridge joint part structure according to the first or second aspect, a pair of plates is provided on each of the two step portions, and the two plates are relative to each other. One side is formed in an uneven shape that goes in and out in the bridge axis direction, the convex portion and the concave portion face each other with a gap therebetween, and the convex portion crosses the above clearance and is on the stepped portion of the other side. And the gap intersects the play space obliquely, and the flexible plate is provided on the both plates so as to cover the gap between the both plates.

Therefore, since the projecting portion of the plate projects over the gap and projects above the mating step, it is possible to prevent the flexible plate and the pavement from falling into the gap. In addition, the expansion / contraction change of the gap between both plates and the vertical displacement of the end portion of the road bridge body are absorbed by the deformation of the flexible plate, and the gap between both plates extends obliquely, so stress is not applied to the pavement. Local concentration is avoided and cracking of the pavement is prevented.

Even if a minute crack is generated in the pavement at a portion corresponding to the gap between the two plates, the crack crosses the gap diagonally in correspondence with the shape of the gap, and therefore the crack of the automobile The tire diagonally crosses the crack, which is advantageous in terms of ensuring good running performance.

[0021]

As described above, according to the first aspect of the present invention, the flexible plate provided with the fiber sheet is arranged so that the flexible plate provided with the fiber sheet is opposed to the other side of the road bridge from the stepped portion of the road bridge body. Since it is continuously provided over the steps of the bridge body or abutment and is continuously paved on it, the problem of undulation of the pavement due to the flow of the elastic compound as in the past is solved, and the upper and lower parts of the road bridge body are Cracks on the pavement due to displacement are suppressed, and resistance to the tensile force of the flexible plate is increased to improve durability, which is advantageous in obtaining crack prevention effects on the pavement for a long period of time. The time can be significantly reduced, which is advantageous for preventing traffic accidents and reducing construction costs.

According to the second aspect of the present invention, in the road bridge joint structure according to the first aspect, the flexible plate has a plurality of continuous sheets extending from the one step to the other step. The fibrous sheets of the above are embedded vertically and embedded, and the fibrous sheets arranged on the upper side and the fibrous sheets arranged on the lower side are different from each other in the spread amount from the clearance to the outside in the bridge axial direction. While reducing the amount of seats used, it is possible to prevent cracks from occurring in the area corresponding to the play space of the pavement, and the stress caused by the expansion change of the play space and the vertical displacement of the end of the road bridge body causes It is dispersed in a plurality of locations, which is advantageous in preventing cracks in the pavement at the location corresponding to the boundary between the road bridge body or abutment and the flexible plate.

According to the third aspect of the present invention, in the road bridge joint structure according to the first or second aspect, a pair of plates, each of which is formed with an uneven shape on one side, is provided between the two plates. Since the gaps are made to face each other diagonally across the play space and are provided in a bridge shape on the play space, the flexible plate is provided so as to cover the gap between both plates, and the continuous pavement is applied on the flexible plate. When the free space expands or contracts, or when the end of the road bridge body is vertically displaced, the effect is less likely to affect the pavement, and it is possible to avoid localized stress concentration on the pavement and cracks. In addition to being advantageous for restraint, the construction time can be significantly shortened, and the sheet polymerization layer and the pavement are prevented from falling into the play gap. In addition, even if a pavement were cracked, running performance was hardly reduced, and running vibration and noise were hardly generated.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1> This embodiment is shown in FIG.
And shown in FIG. In the figure, 1 is a road bridge body, and 2 is a play space that allows the road bridge body 1 to expand and contract. The play gap 2 is provided with play gap closing means 9 including a pair of vertical plates 3, 3, a backup material 4, and a seal material 5. Notches 6 and 6 are formed in the road bridge body 1 on both sides of the play space 2. A step portion 10 which is lower than the upper surface of the road bridge body 1 is provided with a concrete portion 7 made of ultra-high-speed cement or resin concrete for height adjustment in the notch portion 6.
Are formed.

A flexible plate 8 continuous in the bridge axis direction is provided on the clearance closing means 9 and the step portion 10, and the upper surface thereof is substantially flush with the upper surface of the road bridge body 1. A first sheet 11 is provided on the upper surface of the road bridge body 1 and the flexible plate 8, and a base layer asphalt pavement 12 is formed thereon. A second sheet 13 is provided on the base layer asphalt pavement 12, and a surface layer asphalt pavement 14 is provided thereon.

The vertical plates 3 and 3 extend in the longitudinal direction of the play (direction intersecting with the bridge axis) to face each other, and the lower portions are inclined toward each other toward each other to become narrower. This vertical plate 3
Are fixed to the concrete portion 7 by anchors 15. The anchor 15 intersects with the reinforcing bar 16 that connects the road bridge body 1 and the concrete part 7 and the through bar 17 that extends in the longitudinal direction of the free space, and the crossing part is welded. The backup material 4 is made of a material having elasticity such as sponge, is supported by the narrowed lower portion between the vertical plates 3 and 3, and supports the rubber seal material 5 filled in the upper portion.

As shown in FIG. 2, the flexible plate 8 has a plurality of (for example, three) fiber sheets 19 vertically arranged and embedded therein, and the flexible plate 8 is disposed above and below the fiber sheet embedding portion. The asphalt layers 21 and 22 each having a thickness of 2 mm or more are formed on each of them, and have flexibility.

That is, the fiber sheet 19 is formed by binding a large number of long glass fibers with a thermoplastic resin. The long glass fibers extend in the bridge axis direction and in the direction orthogonal to the bridge axis. Then, the flexible plate body (matrix) is formed of asphalt containing rubber, and by embedding the fiber sheet 19 in the central portion in the thickness direction, the upper and lower sides of the fiber sheet embedding portion are respectively formed. The asphalt layers 21 and 22 with rubber are formed on the.

The fiber sheet may be a long glass fiber extending only in the bridge axis direction, a long glass fiber extending obliquely to the bridge axis, or a long glass fiber extending in the bridge axis direction and an oblique direction. It may have a long glass fiber extending in the direction.

The flexible plate body may be formed of rubber or asphalt, a material containing asphalt as a main component, or a synthetic resin, instead of the rubber-containing asphalt.

Each of the first and second sheets 11 and 13 is formed by forming an asphalt layer (or a layer containing asphalt as a main component) on both sides of a thin film obtained by binding a large number of long glass fibers with a thermoplastic resin. A composite sheet that is waterproof. The long glass fibers extend in the bridge axis direction and in the direction intersecting the bridge axis.

As the sheets 11 and 13, long glass fibers extending only in the bridge axis direction, glass long fibers extending obliquely with respect to the bridge axis, or glass long fibers extending in the bridge axis direction. And a long glass fiber extending obliquely may be used.

The first sheet 11 on the lower side covers the flexible plate 8 and spreads over several tens cm to several meters on both sides thereof. The upper second sheet 13 is at a position corresponding to the flexible plate 8,
It is wider than the flexible plate 8 and narrower than the first sheet 11. The first sheet 11 and the second sheet 13 are
The first sheets 11 may be narrower or may have the same width as each other.

Therefore, with the road bridge joint structure as described above, the problem of the pavement waving due to the flow of the elastic compound as in the conventional case can be solved. Also, expansion of Yuma 2
The contraction change and the vertical displacement of the end portion of the road bridge body are absorbed by the deformation of the rubber-containing asphalt layer 22 on the lower side, and the stress applied to the fiber sheet 19 is reduced. Furthermore, the fiber sheet 19 prevents a large force from being applied to the pavement and thus cracks. In addition, the vertical displacement of the end of the road bridge body is such that the asphalt layer 21 with rubber is on the upper side.
Also, even if the fibrous sheet 19 shifts due to the expansion / contraction change of the play, the effect on the base layer asphalt pavement 12 is mitigated by the rubber-containing asphalt layer 21 on the upper side, and the occurrence of cracks is prevented. To be done. Even if the base layer asphalt pavement 12 is cracked, the second sheet 13 prevents the surface layer asphalt pavement 14 from being cracked.

Further, even if minute cracks are generated in the pavements 12 and 14, the sheets 11 and 13 and the flexible plate 8 are waterproof, so that water leakage from the road to the play space 2 is prevented. To be done.

Next, the construction method will be described. First, the notches 6 and 6 are formed at the ends of the road bridge main bodies 1 and 1, the bar 16 is planted in the road bridge main body 1, and the clearance closing means 9 is fitted into the clearance 2. Then, the reinforcing bar 17 is arranged, and the intersections of the anchor 15, the bar 16 and the reinforcing bar 17 are welded to each other. After that, super fast hardening cement or resin concrete is cast into the notches 6 and 6 to form the concrete portion 7. The upper surface of the concrete portion 7, that is, the step portion 1
0 is adjusted to be lower than the upper surface of the road bridge body 1 by the thickness of the flexible plate 8.

Next, the upper surface of the clearance closing means 9 and the step portion 1
After applying the sealing material to 0, the flexible plate 8 is placed thereon. Next, the first sheet 11 is laid and the base layer asphalt pavement 12 is constructed, and the second sheet 13 is laid on it to construct the surface layer asphalt pavement 14.

Therefore, heating and mixing in the field such as the conventional elastic compound and cooling after the construction become unnecessary, and the sheet polymerized layer 8 can be constructed immediately and the pavement can be constructed immediately after the construction. It can be started and the construction time can be shortened significantly.

A flexible plate 8 having a rubber-containing asphalt layer 24 having a thickness of 2 mm or more between the upper and lower fibrous sheets 19, 19 (intermediate) as shown in FIG. 3 can be used.

<Second Embodiment> FIG. 4 shows the second embodiment.
Is shown in. The difference from the first embodiment is that the load receiving plate 23 is provided, and the other points are the same.
Shows only the main part of this embodiment. The load receiving plate 23 is formed of a metal plate having corrosion resistance such as an aluminum alloy or stainless steel, and covers the free space closing means 9 and projects to both sides thereof. One side of the load receiving plate 23 is fixed to the concrete portion 7. Then, the sealing material is applied to the upper surface of the concrete portion 7 and the upper surface of the load receiving plate 23, and the flexible plate 8 is provided thereon.

Therefore, with such a road bridge joint structure, the same effect as that of the first embodiment can be obtained, and even when the wheel load of the vehicle acts on the upper side of the play space 2, the load receiving plate 23 can be used. It is possible to prevent the flexible plate 8 and the pavements 12 and 14 from falling into the free space portions (the portions of the rubber seal material 5 of the free space closing means 9).

It is preferable that the load receiving plate 23 is spread out from both vertical plates 3 and 3 by about 50 to 100 mm.

<Third Embodiment> FIG. 5 shows the third embodiment.
Unlike the second embodiment, only one fibrous sheet 19 is embedded in the flexible plate 8. Others are the same as those in the second embodiment. Also in the case of the present embodiment, the same operational effect as that of the second embodiment can be obtained.

<Embodiment 4> This embodiment is shown in FIG.
Shows only the main part. The basic structure of this embodiment is the same as that of the first embodiment, but the configuration of the flexible plate 8 is different.

That is, all the plurality of fiber sheets of the flexible plate 8 are provided so as to straddle the play space 2, but the fiber sheets arranged above and below are spread from the play space 2 to the outside in the axial direction of the bridge. The amounts are different from each other. Flexible plate 8 of the present embodiment
Includes three fiber sheets 19a to 19c, and the width in the bridge axis direction is from the lower fiber sheet 19a to the intermediate fiber sheet 19
b, the upper fiber sheet 19c is gradually widened. Then, both sides of the intermediate fiber sheet 19b are spread to both outer sides in the bridge axis direction than the corresponding both side edges of the lower fiber sheet 19a, and both sides of the upper fiber sheet 19c are wider than the corresponding side edges of the intermediate fiber sheet 19b. It extends to both outsides in the bridge axis direction.

The flexible plate 8 has rubber-containing asphalt layers 21 and 22 on the upper side and the lower side of the embedded portion of the fiber sheet.
Is equipped with.

Therefore, each of the plurality of fibrous sheets 19a to 19c resists the external force caused by the expansion / contraction change of the play gap 2 and the vertical displacement of the end portion of the road bridge body,
It is possible to prevent a crack from being generated in a portion of the pavement 12 or 14 corresponding to the play space 2.

In this way, the upper and lower fibrous sheets 19a to 19c differ from each other in the amount of expansion from the play space 2 to the outside in the bridge axis direction, so that the strength is not uniform over the entire width in the bridge axis direction. Therefore, in the flexible plate 8, the concentration of stress due to the expansion change of the play space 2 and the vertical displacement of the end portion of the road bridge body appears dispersedly at a plurality of locations in the bridge axis direction. That is, the lower fiber sheet 1 in the flexible plate 8
9a, parts corresponding to both side edges, and the intermediate fiber sheet 1
Areas corresponding to both side edges of 9b are areas where stress is concentrated.

Due to this stress distribution, the yield strength of the flexible plate 8 itself can be ensured even when the amount of fiber sheet used is reduced, and the stress concentrated on the boundary between the road bridge body 1 and the flexible plate 8 can be secured. Is weakened and cracking of the pavement at the site corresponding to this boundary is avoided.

Further, the flexible plate 8 is pulled in the bridge axis direction at the portion in contact with the step portion 10 when the clearance 2 is expanded and changed.
The tensile stress concentrates on the flexible plate 8 at a portion corresponding to the side edge of the lower fiber sheet 19a. However, since the intermediate fiber sheet 19b is covered on the upper side of the side edge of the lower fiber sheet 19a, the intermediate fiber sheet 19b resists the tensile force, so that the lower fiber sheet 19a of the flexible plate 8 is prevented. It is prevented that a crack is generated in a portion corresponding to the side edge of the. Similarly, the intermediate fiber sheet 1 in the flexible plate 8
Even if stress concentrates on the portion corresponding to the side edge of 9b, the upper fibrous sheet 19c covering that portion resists cracking of the flexible plate 8 at that portion due to resistance.

The flexible plate 8 has rubber-containing asphalt layers 21 and 22 on the upper side and the lower side of the embedded portion of the fiber sheet.
Since it is provided, the same operational effect as that of the first embodiment is obtained.

<Fifth Embodiment> FIG. 7 shows the fifth embodiment.
And shown in FIG. This embodiment also has the same basic structure as that of the first embodiment, but is characterized in that a pair of plates 31 and 32 for receiving a load are provided below the flexible plate 8.

That is, as shown in FIG. 8, one plate 31 has one side protruding in a mountain shape, and the other plate 32 has a center formed in a concave portion corresponding to the mountain-shaped convex portion of the plate 31 on one side. And both sides are convex portions that relatively project. The opposite sides of the plates 31 and 32 that do not face each other extend linearly, and a plurality of concrete nail insertion holes 34 are formed along the linear edges.

As shown in FIG. 7, a continuous third sheet 35 is laid on the step portions 10 and 10 so as to straddle the free space closing means 9. The plates 31 and 32 are provided on the third sheet 35 so that the chevron-shaped convex portion and the concave portion are opposed to each other in the bridge axis direction with a gap 33, and the concrete nails are inserted into the insertion holes 34. Steps 10, 10 respectively
It is fixed to.

The protrusions of the plates 31 and 32 are projected above the play gap 2 and above the mating step 10, so that the gap 33 diagonally crosses the play gap 2. The plates 31 and 32 are the same as the third sheet 35.
You may install it on the bridge so that it can move in the direction of the bridge axis. Gap 33
A sealing material 36 is filled in the. Then, the sealing material is applied on both the plates 31 and 32, and the flexible plate 8 is installed thereon.

Although only one chevron is formed on the plate 31, it may be formed in a concavo-convex shape in which a plurality of chevrons are arranged in parallel. In that case, the other plate 32 is also made to have the same concavo-convex shape so that the convex portions and the concave portions of the other plate 32 face each other.

Further, instead of the third sheet 35, the flexible plate 8 may be provided below both plates 31, 32.

Therefore, in the above-mentioned road bridge joint structure, the convex portions of the plates 31 and 32 exceed the clearance 2 and the step portion 1 on the other side.
Since it projects above 0, the flexible plate 8 and the pavement 12, 1
4 is prevented from falling into the play area. Then, as in the previous embodiment, when the gap 33 between the plates 31 and 32 expands or contracts as the road bridge body 1 expands or contracts, or when the road bridge body end portion is vertically displaced. On the pavement 1
The flexible plate 8 prevents the stress from concentrating on the portions corresponding to the gaps 33 of 2, 2 and 14 so that cracks are less likely to occur and the construction time is significantly shortened as compared with the conventional case.

Thus, even if a small crack is generated in the pavement 12 or 14 at the portion corresponding to the gap 33, the crack corresponds to the shape of the gap and the clearance 2
Therefore, the tire of the automobile crosses the crack at an angle, which is advantageous in terms of ensuring good drivability.

The load receiving plate 23 described in the second embodiment may be provided between the looseness closing means 9 and the third seat 35. Alternatively, the load receiving plate 23 may be provided on the third sheet 35, a rubber sheet or other sheet layers may be provided on the load receiving plate 23, and the plates 31 and 32 may be provided thereon.

The flexible plate 8 of the fourth embodiment can be used in the second and fifth embodiments.

The flexible plate 8 may be provided with a rubber layer, an asphalt layer, or a rubber-containing asphalt layer only on the upper side or the lower side of the sheet embedding portion.

Further, although each of the above embodiments has a joint structure between road bridge main bodies, the present invention can be applied to a joint between a road bridge main body and abutment as well.

[Brief description of drawings]

FIG. 1 is a sectional view showing a road bridge joint structure according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a flexible plate of the same embodiment with a part thereof omitted.

FIG. 3 is a partially omitted cross-sectional view showing another example of the flexible plate of the same embodiment.

FIG. 4 is a sectional view showing a road bridge joint structure according to the second embodiment of the present invention.

FIG. 5 is a partially omitted sectional view showing a road bridge joint structure according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing a road bridge joint structure according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view showing a road bridge joint structure according to a fifth embodiment of the present invention with a partial cross section and a partial cutaway.

FIG. 8 is a plan view showing the plate of the same embodiment.

FIG. 9 is a sectional view showing an example of a conventional road bridge joint structure.

[Explanation of symbols]

1 Road bridge body 2 Yuma 6 Notch 7 Concrete section 8 flexible plate 9 Free space blocking means 10 steps 11 First Sheet 12 Base layer asphalt pavement 13 Second sheet 14 Surface asphalt pavement 19 fiber sheet 19a to 19c Fiber sheet 21 Asphalt layer with upper rubber 22 Lower rubber-containing asphalt layer 31 plates 32 plates 33 Gap

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Claims (3)

[Claims] 1. A blind bridge type road bridge seam structure which is continuously paved so as to cover the free space of the road bridge seam, wherein each of the road bridge main bodies on both sides of the free space is a road bridge main body on both sides of the free space. And the abutment are formed with a step portion lower than the upper surface of the road bridge main body, and a flexible plate is provided so as to straddle the step portions on both sides of the play, and the flexible plate is provided from the one step portion to the other. A road bridge joint structure, characterized in that a continuous fiber sheet is integrally provided over the steps of, and continuous pavement is performed on the flexible plate. 2. The road bridge joint structure according to claim 1, wherein a plurality of continuous fiber sheets are vertically arranged on the flexible plate from the one step to the other step. The structure of the road bridge is characterized in that the fiber sheet arranged on the upper side and the fiber sheet arranged on the lower side are different from each other in the amount of expansion from the play space to the outside in the axial direction of the bridge. 3. The road bridge joint structure according to claim 1 or 2, wherein a pair of plates is provided on each of the two step portions, and the two plates have one opposite side in the bridge axial direction. Are formed in a concave and convex shape with which the convex and concave portions are in and out of each other, and the convex portions and the concave portions are opposed to each other with a gap therebetween, and the convex portion protrudes above the clearance above the stepped portion on the other side, and the above gap is formed. A road bridge joint structure, wherein the flexible plate is provided diagonally across the play space, and the flexible plate is provided on the plates so as to cover a gap between the plates.