JP3742062B2 - Floor slab bridge structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a floor slab bridge structure in a river or a bridge on land.
[0002]
[Prior art]
In Japanese Patent Application No. 2002-86134, the applicant has placed steel girders with flanges at the upper and lower ends of the abdomen in parallel with each other in the bridge width direction so that the thickness side end faces of the lower flanges face each other, and the upper flange at the lower part. A concrete inlet is formed between the upper flanges with a shorter width than the flange, and the concrete is placed in a space defined between the upper flange, the lower flange and the belly plate from the concrete inlet to form a lower concrete layer. A floor slab in which concrete is cast on the upper flange to form an upper concrete layer that is joined to the lower concrete layer through the concrete inlet, and a floor slab concrete layer is formed by the upper concrete layer and the lower concrete layer. A bridge structure is provided.
[0003]
Further, in Japanese Patent Application No. 2002-86134, a joint plate made of steel is interposed between the lower flanges of the steel girders arranged in parallel in the bridge width direction, and the lower flanges of the steel girders adjacent to the left and right plate thickness side end surfaces of the joint plates are used. A space formed between the upper flange, the lower flange, the joint plate, and the belly plate from the concrete inlet by forming the concrete inlet between the upper flanges by interposing the joint plate with the plate thickness side end surfaces being in contact with each other. Concrete is cast in the lower concrete layer, and concrete is cast on the upper flange to form an upper concrete layer that is connected to the lower concrete layer through the concrete inlet, We provide a floor slab bridge structure in which a floor concrete layer is formed with a lower concrete layer.
[0004]
In any of the above-mentioned floor slab bridge structures, it has a horizontal reinforcing bar horizontally provided on the upper flange, and has a suspended reinforcing bar suspended in the space through the concrete inlet from the horizontal reinforcing bar, The horizontal reinforcing bar is embedded in the upper concrete layer, and the suspended reinforcing bar is embedded in the lower concrete layer.
[0005]
Also, in any of the above-mentioned floor slab bridge structures, an abdominal threading bar is inserted through the parallel plates of the steel girders, and a plurality of the abdominal threading bars are arranged at narrow intervals in the bridge length direction. Stoppers such as nuts that come into contact with the outer side surfaces of the left and right end steel girders are provided at both ends of the bar, and the reinforcing bars are embedded in the lower concrete layer placed in the space. In addition, both ends of the abdominal threading rod and stoppers are embedded in a side concrete layer cast on the outer surface of the steel girders at the left and right ends.
[0006]
[Problems to be solved by the invention]
However, in the above-mentioned prior application example, the concrete (lower concrete layer) is cast and filled in the space between the upper flange and the lower flange of the steel girder having the H shape, and the span length of the slab bridge becomes long. In this case, the steel girder has a very high girder height, so a large amount of the lower concrete layer that fills the space between the upper and lower flanges makes the entire floor slab bridge too heavy, making it difficult to obtain the specified load bearing capacity. It has a difficult problem.
[0007]
[Means for Solving the Problems]
The present invention provides a floor slab bridge structure that appropriately solves the problem while adopting the concept of the floor slab bridge structure in the above-mentioned prior application example.
[0008]
This floor slab bridge structure uses steel girders (main girders) with upper flanges, lower flanges, and intermediate flanges projecting from the top, bottom and middle of the web, respectively. The intermediate flanges of adjacent steel girders are directly butted together or indirectly via a joint plate to form a concrete inlet between the upper flanges of adjacent steel girders, It has a structure in which a floor slab concrete layer is formed between the intermediate flange and the upper flange by concrete cast through the entrance . The above steel girders are connected between the steel beams by connecting the webs with the cross-girder steel plates according to the bridge specifications.
[0009]
Preferably, the upper flange is embedded in the floor slab concrete layer, and road pavement is performed on the upper surface of the floor slab concrete layer.
[0010]
Between the upper flange and the lower flange of the steel girder outer surface at both ends in the road width direction, a side concrete layer is formed which covers the outer surface and is integrally beaten with the floor slab concrete layer.
[0011]
As another example, steel girders (main girders) having the upper flange, the lower flange, and the intermediate flange are juxtaposed in the bridge width direction, and a floor slab concrete layer is formed between the upper intermediate flange and the upper flange. A reinforced concrete layer is formed between the lower intermediate flange and the lower flange. The above steel girders are connected between the steel beams by connecting the webs with the cross-girder steel plates according to the bridge specifications.
[0012]
Preferably, the upper flange is embedded in the floor slab concrete layer, and road pavement is performed on the upper surface of the floor slab concrete layer.
[0013]
Between the upper flange and the lower flange of the steel girder outer surface at both ends in the road width direction, a side concrete layer is formed which covers the outer surface and is integrally formed with the floor slab concrete layer and the reinforced concrete layer.
[0014]
In the above-mentioned floor slab bridge structure, concrete is placed in a limited space between the upper flange and the intermediate flange of the steel girder, or between the upper flange and the upper intermediate flange of the steel girder, and the lower flange and the lower This is a structure in which concrete is placed and filled in a limited space between the intermediate flanges, reducing the overall weight of the floor slab bridge, and even for floor slab bridges with long span lengths, without excessive weight increase. obtain. The total amount of reinforcing bars used and the amount of concrete placed can also be reduced.
[0015]
Overall, the dead load applied to the steel girder (main girder) can be greatly reduced, and the load bearing capacity can be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a floor slab bridge structure according to the present invention will be described with reference to FIGS.
[0017]
As shown in FIGS. 1 to 4, an upper flange 3 projecting from the upper end of the abdominal plate 2 to the left and right as a main girder, a lower flange 4 projecting from the lower end to the left and right, and an intermediate flange projecting from the intermediate part to the left and right A steel girder 1 having 5 is prepared.
[0018]
Preferably, the intermediate flange 5 is arranged at a position higher than the center portion of the abdominal plate 2, that is, at a position biased to the upper flange 3.
[0019]
The steel girder 1 uses an H-section steel of JIS specifications (JISG3101 steel material, JISG3106 steel material, JISG3114 steel material, etc.) composed of a lower flange 4, an upper flange 3, and a belly plate 2, and the side of the bellows plate 2 of the H-shaped steel. An intermediate flange 5 (upper intermediate flange 5 and lower intermediate flange 5 'described later) is integrally attached to the belly plate 2 by welding or bolts, and extends in parallel with the upper and lower flanges 3 and 4.
[0020]
Alternatively, the upper and lower flanges 3 and 4 are welded to the upper and lower ends of the abdominal plate 2, and an intermediate flange 5 (upper intermediate flange 5 and lower intermediate flange 5 'described later) is attached to the same intermediate portion with bolts or welding. Is used.
[0021]
The steel girders (main girders) 1 are juxtaposed in the bridge width direction, and both ends of the steel girders 1 are bridged between the piers 6 through rubber bearings or the like.
[0022]
As shown in FIGS. 1, 2, and 4, the steel girder 1 is connected between the abdomen plates 2 with a cross girder steel plate 22 according to the bridge specifications, and the steel girder 1 is connected to form a rigid assembly. . The cross-girder steel plate 22 is directly welded or bolted to the belly plate 2. Alternatively, as shown in the figure, a battledore 25 is extended from the side surface of the abdomen 2 extending directly below the intermediate flange 5, the battledore 25 is arranged at intervals in the bridge length direction, and the cross girder steel plates 22 are arranged between the battled plates 25 with a number of bolts 23. Or attach by welding.
[0023]
A floor slab concrete layer 7 is formed between the intermediate flange 5 and the upper flange 3. Preferably, the upper flange 3 is embedded in the floor slab concrete layer 7, and road pavement 8 is performed on the upper surface of the floor slab concrete layer 7.
[0024]
In other words, the lower floor slab concrete layer 7b is placed and filled in the space 10 defined by the upper flange 3, the intermediate flange 5, and the upper belly plate 2, and the upper floor slab concrete layer 7a is placed on the upper flange 3. And pavement 8 is constructed on the upper surface of the upper floor slab concrete layer 7a on the upper flange 3.
[0025]
Alternatively, the upper surface of the upper flange 3 is exposed on the upper surface of the floor slab concrete layer 7 placed in the space 10, and the road pavement 8 is constructed on the upper surface of the floor slab concrete layer 7 and the upper surface of the upper flange 3.
[0026]
A concrete inlet 9 is provided between the side end faces of the upper flange 3, and concrete flows into the space 10 through the concrete inlet 9, and the lower floor slab concrete layer 7 b and the upper floor slab concrete layer 7 a They are nailed together and connected through the concrete inlet 9.
[0027]
As a means for forming the concrete inflow port 9 shown in FIGS. 1 to 4, a joint plate 11 made of steel is interposed between the intermediate flanges 5 of the steel beam 1 as shown in FIG. The one plate thickness side end surface and the plate thickness side end surface of the adjacent intermediate flange 5 are brought into contact with each other, and the other plate thickness side end surface of the joint plate 11 and the plate thickness side end surface of the adjacent intermediate flange 5 are mutually connected. The concrete inlet 9 corresponding to the width of the joint plate 11 is formed between the upper flanges 3 in the butted state.
[0028]
The joint plate 11 extends in the bridge length direction in parallel with the steel beam 1, that is, the belly plate 2 and the flanges 3, 4 and 5.
[0029]
As described above, the steel girders 1 are brought into contact with each other via the joint plate 11 at the intermediate flange 5 to form a continuous mold frame bottom plate.
[0030]
For example, the concrete inlet 9 is formed by using the steel girder 1 in which the widths in the bridge width direction of the upper and lower flanges 3 and 4 and the intermediate flange 5 are equal and using the joint plate 11.
[0031]
As shown in FIG. 5, as a means for interposing the joint plate 11 between the intermediate flanges 5, a hanging piece 18 that projects from the upper surface of the joint plate 11 to the left and right is provided integrally with the joint plate 11, and The hanging pieces 18 are arranged at intervals in the bridge length direction, and the hanging pieces 18 are hung on the upper surfaces of the adjacent intermediate flanges 5, so that the joint plates 11 are interposed between the intermediate flanges 5 to be abutted.
[0032]
Alternatively, as a means for forming the concrete inflow port 9 shown in FIGS. 1 to 4, the width of the intermediate flange 5 of the steel girder 1 in the bridge width direction is set to the bridge width direction of the upper and lower flanges 3 and 4 as shown in FIG. And the one end face on the thickness side of the adjacent intermediate flange 5 and the end face on the thickness side of the adjacent intermediate flange 5 are brought into contact with each other, and the other end face on the thickness side of the intermediate flange 5 The concrete inflow port 9 is formed between the upper flanges 3 so that the plate thickness side end surfaces of the adjacent intermediate flanges 5 face each other.
[0033]
As described above, the steel girders 1 are brought into contact with each other by the intermediate flange 5 to form a mold bottom plate that is continuous with each other and closed.
[0034]
A concrete inflow port 9 is formed between the upper flanges 3 by indirect butting of the intermediate flange 5 through the joint plate 11 or by direct butting of the intermediate flange 5, and this concrete flow is shown in FIGS. Concrete is cast from the inlet 9 into a space 10 defined between the upper flange 3, the intermediate flange 5 and the belly plate 2 to form a lower floor slab concrete layer 7b, and concrete is cast on the upper flange 3. Thus, the upper floor slab concrete layer 7a to be connected to the lower floor slab concrete layer 7b and the concrete inlet 9 is formed.
[0035]
Therefore, a floor slab concrete layer 7 in which the upper flange 3 is embedded in a limited region above the steel beam 1 is formed.
[0036]
Further, as the reinforcing structure of the floor slab concrete layer 7, a reinforcing bar is horizontally provided on the upper flange 3 in the bridge width direction, and a vertical reinforcing bar 14 extending in the bridge length direction is provided on the horizontal reinforcing bar 12 with a bridge width. The vertical reinforcing bars 14 and / or the horizontal reinforcing bars 12 are braided to the vertical reinforcing bars 14 and / or the horizontal reinforcing bars 12, and the reinforcing reinforcing bars 13 are inserted into the space 10 through the concrete inlet 9. Hanging.
[0037]
As shown in FIGS. 1 to 4, the suspended reinforcing bar 13 is assembled by hooking the upper end of the horizontal reinforcing bar 13 to the horizontal reinforcing bar 12 or / the vertical reinforcing bar 14, and the horizontal reinforcing bar 12 is connected to the upper flange. 3 is supported on the upper surface. A large number of reinforcing bars 12 and 13 are arranged in the direction of the bridge length of the steel girder 1 at regular intervals.
[0038]
Thus, the horizontal reinforcing bars 12 and the vertical reinforcing bars 14 are embedded in the upper floor slab concrete layer 7a, and the suspended reinforcing bars 13 are embedded in the lower floor slab concrete layer 7b. Bond strength of the lower floor slab concrete layer 7b, in particular, the lower floor slab concrete layer 7b divided by the belly plate 2 is appropriately reinforced, and the bond between the upper and lower floor slab concrete layers 7a and 7b is strengthened to increase the strength of the entire floor slab. Give.
[0039]
As another example, as shown in FIG. 1 to FIG. 4, a through hole 15 is provided in the abdominal plate 2 of the steel girder 1 so as to penetrate in the bridge length direction, and an abdominal threading rod 16 made of a steel wire is inserted into the through hole 15. Stoppers 17 such as nuts that contact the outer side surfaces of the belly plate 2 of the steel beam 1 at the left and right end in the bridge width direction are provided at both ends of the belly bar 16.
[0040]
The abdominal threading rods 16 are arranged in a single row in the bridge width direction, and a large number are arranged in the bridge length direction at regular intervals. Alternatively, a plurality of rows of the abdominal threading rods 16 are juxtaposed in a double row in the upper stage and the lower stage in the bridge width direction, and a large number are arranged in parallel at a certain interval in the bridge length direction.
[0041]
The joint plate 11 is integrally provided with a reinforcing plate 20 that rises from the upper surface of the central portion of the joint plate 11 and extends in the bridge length direction. The reinforcing plate 20 is embedded in the lower floor slab concrete layer 7b. 20 is provided with a through hole 21 that can be penetrated in the bridge width direction, and the abdominal threading rod 16 is inserted therethrough. That is, the belly bar 16 is inserted through the upper belly plate 2 and the reinforcing plate 20.
[0042]
The joint plate 11 and the reinforcing plate 20 have a T shape, so that a commercially available columnar T-shaped steel is applied, or a top flange of a commercially available columnar H-shaped steel is cut to form a T-shaped steel, and the joint The plate 11 and the reinforcing plate 20 are formed.
[0043]
The belly bar 16 functions as a fastening means for the steel girder 1 and is embedded in the lower floor slab concrete layer 7b placed through the concrete inlet 9, and functions as a concrete reinforcing bar. That is, it functions as a horizontal reinforcing bar that cooperates with the horizontal reinforcing bar 12 on the upper flange 3.
[0044]
Further, the lower end of the suspended reinforcing bar 13 is braided, for example, by hooking the horizontal reinforcing bar, that is, the belly bar 16, so that the three members 12, 13, 16 function organically. Therefore, the suspended reinforcing bar 13 constitutes a connecting reinforcing bar between the horizontal reinforcing bars 12.
[0045]
FIG. 3 shows an example in which a slab concrete layer 7 is formed on the steel girder 1 and a reinforced concrete layer 19 is formed on the lower part of the steel girder 1.
[0046]
As shown in FIG. 3, the intermediate flange (upper intermediate flange) 5 extending in the bridge length direction described above from the side surface of the abdominal plate 2 of the steel girder 1 that is biased toward the upper flange 3 is stretched symmetrically in the bridge width direction. A steel girder 1 is prepared in which an intermediate flange (lower intermediate flange) 5 ′ extending in the bridge length direction from the side face of the same abdominal plate 2 that is biased toward the lower flange 4 side is projected symmetrically in the bridge width direction.
[0047]
As described above, the floor slab concrete layer 7 is formed between the upper intermediate flange 5 and the upper flange, and the reinforced concrete layer 19 is formed between the lower flange 4 and the lower intermediate flange 5 '. That is, concrete is cast and filled in the space 10 defined by the lower flange 4, the lower intermediate flange 5 ′, and the web 2 to form a reinforced concrete layer 19.
[0048]
The lower intermediate flange 5 ′ is embedded in the reinforced concrete layer 19. Alternatively, the upper surface of the lower intermediate flange 5 ′ is exposed on the upper surface of the reinforced concrete layer 19.
[0049]
A concrete inlet 9 is provided between the end faces of the lower intermediate flange 5 ′ in the bridge width direction, and the concrete flows into the space 10 through the concrete inlet 9.
[0050]
As a means for forming the concrete inlet 9 shown in FIG. 3, as shown in FIG. 3, a joint plate 11 made of steel is interposed between the lower flanges 4 of the steel beam 1, and one of the joint plates 11 is formed. The thickness side end surface and the plate thickness side end surface of the lower flange 4 adjacent to each other are brought into contact with each other, and the other plate thickness side end surface of the joint plate 11 and the plate thickness side end surface of the adjacent lower flange 4 are brought into contact with each other. Thus, the concrete inlet 9 corresponding to the width of the joint plate 11 is formed between the lower intermediate flanges 5 '.
[0051]
The joint plate 11 extends in the bridge length direction in parallel with the steel beam 1, that is, the belly plate 2 and the flanges 3, 4 and 5.
[0052]
As described above, the steel girders 1 are brought into contact with each other via the joint plate 11 in the lower flange 4 to form a mold bottom plate that is continuous and closed.
[0053]
For example, the concrete inflow port 9 is formed by using the steel girder 1 in which the widths in the bridge width direction of the upper and lower flanges 3 and 4 and the upper and lower intermediate flanges 5 and 5 ′ are equal and using the joint plate 11.
[0054]
As shown in FIG. 5, as a means for interposing the joint plate 11 between the lower flanges 4, a hanging piece 18 projecting left and right from the upper surface of the joint plate 11 is provided integrally with the joint plate 11. The hanging pieces 18 are arranged at intervals in the bridge length direction, and the hanging pieces 18 are hung on the upper surfaces of the adjacent lower flanges 4, so that the joint plate 11 is interposed between the lower flanges 4.
[0055]
Alternatively, as a means for forming the concrete inlet 9 shown in FIG. 3, the width in the bridge width direction of the lower flange 4 of the steel girder 1 is made wider than the width in the bridge width direction of the lower intermediate flange 5 ′ as in FIG. The bottom flange 4 adjacent to the other thickness side end surface of the lower flange 4 is brought into a state where the one end thickness side surface of the adjacent lower flange 4 and the thickness side end surface of the adjacent lower flange 4 abut each other. The concrete inflow port 9 corresponding to the width of the joint plate 11 is formed between the lower intermediate flanges 5 ′ in such a manner that the end surfaces of the plate thickness side are in contact with each other.
[0056]
As described above, the steel girders 1 are brought into contact with each other by the lower flange 4 to form a formwork bottom plate that is continuous with each other and closed.
[0057]
A concrete inlet 9 is formed between the lower intermediate flanges 5 ′ by indirect butting of the lower flange 4 through the joint plate 11 or by direct butting of the lower flange 4, and as shown in FIG. 9, concrete is placed in a space 10 defined between the lower intermediate flange 5 ′, the lower flange 4, and the belly plate 2 to form a reinforced concrete layer 19.
[0058]
As a further reinforcement structures of the reinforced concrete layer 19, as shown in FIG. 3, the through hole 15 to penetrate the bridge width direction provided in the lower web plate 2 of steel girder 1, belly made of steel wire rod in the through-holes 15 Through rods 16 are inserted, and stoppers 17 such as nuts are provided at both ends of the belly through rods 16 so as to abut on the outer side surfaces of the lower belly plate 2 of the steel beam 1 at the left and right end in the bridge width direction.
[0059]
The abdominal threading rods 16 are arranged in a single row in the bridge width direction, and a large number are arranged in the bridge length direction at regular intervals. Alternatively, a plurality of rows of the abdominal threading rods 16 are juxtaposed in a double row in the upper stage and the lower stage in the bridge width direction, and a large number are arranged in parallel at a certain interval in the bridge length direction.
[0060]
In addition to the abdominal bar 16, vertical reinforcing bars 14 extending in the bridge length direction are arranged side by side at a certain interval in the bridge width direction, and the reinforcing bars 13 are connected between the abdominal bars 16. In the reinforcing concrete layer 19, the abdominal bar 16, that is, the horizontal reinforcing bar 16, the vertical reinforcing bar 14, and the connecting reinforcing bar 13 are embedded, and the strength of the reinforcing concrete layer 19, particularly the lower belly plate 2 is used. The segmented reinforced concrete layer 19 is appropriately reinforced to give strength to the entire floor slab bridge.
[0061]
Similarly to the above, the joint plate 11 is integrally provided with a reinforcement plate 20 which rises from the upper surface of the central portion of the joint plate 11 and extends in the bridge length direction, and the reinforcement plate 20 is embedded in the reinforced concrete layer 19. The reinforcing plate 20 is provided with a through-hole 21 that can be penetrated in the bridge width direction, and the abdominal threading rod 16 is inserted therethrough. That is, the belly bar 16 is inserted through the lower belly plate 2 and the reinforcing plate 20.
[0062]
1 to 4 uses a headed bar having a head (stopper 17) at one end and a nut (stopper 17) at the other end to screw in the steel girder 1 at the left and right end. Tighten to the outer side of the abdominal plate 2. Alternatively, the abdominal threading rod 16 is fastened to the outer surface of the abdominal plate 2 of the steel girder 1 at the left and right end by screwing nuts at both ends.
[0063]
This tightening force does not need to give a butting force to the butting portion of the intermediate flange 5 and the lower flange 4 of the steel girder 1. That is, the intermediate flange 5 and the lower flange 4 of the steel girder 1 are in free contact with each other, and there may be a slight gap.
[0064]
As shown by broken lines in FIG. 1 and FIG. 3, between the upper flange 3 and the lower flange 4 of the steel girder 1 outer surface at both ends in the road width direction in FIGS. A side concrete layer 24 integrally formed with the slab concrete layer 7 is formed.
[0065]
The side concrete layer 24 is integrally formed with the floor slab concrete layer 7 and the reinforced concrete layer 19, and the outwardly projecting flanges 3, 4, 5 of the steel girder 1 at the left and right ends of the bridge width direction in the side concrete layer 24. , 5 'and both ends of the belly bar 16 and its stopper 17 are embedded to prevent corrosion due to wind and rain, etc., and to make the belly bar 16 function soundly over time without damaging the appearance. In this side concrete layer 24, reinforcing bars 27 are arranged continuously at both ends of the horizontal reinforcing bars 12 described above.
[0066]
In the floor slab structure shown in FIG. 3, the floor slab concrete layer 7, the reinforced concrete layer 19, and the side concrete layer 24 form a cavity structure partitioned by the abdominal plate 2, thereby defining a plurality of cavities 26. is doing. The cavity 26 can be filled with a lightweight material such as foamed urethane resin to prevent corrosion of the steel material.
[0067]
【The invention's effect】
According to the present invention, the concrete is placed in a limited space between the upper flange and the intermediate flange of the steel beam, or between the upper flange and the upper intermediate flange of the steel beam, and between the lower flange and the lower intermediate flange. The weight of the whole slab bridge is reduced by the structure in which concrete is cast and filled in a limited space. Therefore, even a floor slab bridge with a long span length can be appropriately implemented without causing an excessive increase in weight. The total amount of reinforcing bars used and the amount of concrete placed can also be reduced.
[0068]
Overall, the dead load applied to the steel girder (main girder) can be greatly reduced, and the load bearing capacity can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the bridge width direction showing a first embodiment of a floor slab bridge structure.
FIG. 2 is a cross-sectional view in the bridge width direction showing a second embodiment of a floor slab bridge structure.
FIG. 3 is a cross-sectional view in the bridge width direction showing a third embodiment of a floor slab bridge structure.
FIG. 4 is a cross-sectional view in the bridge width direction showing a fourth embodiment of a floor slab bridge structure.
FIG. 5 is a perspective view of relevant parts illustrating a joint plate used in each of the embodiments.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Steel girder, 2 ... Abdominal board, 3 ... Upper flange, 4 ... Lower flange, 5, 5 '... Intermediate flange, 6 ... Pier, 7, 7a, 7b ... Floor slab concrete layer, 8 ... Road pavement, 9 ... Concrete inlet, 10 ... space, 11 ... joint plate, 12 ... horizontal reinforcing bar, 13 ... suspended reinforcing bar, 14 ... vertical reinforcing bar, 15 ... through hole, 16 ... through rod, 17 ... stopper, 18 ... hanging Pieces 19 ... Reinforced concrete layer, 20 ... Reinforcement plate, 21 ... Through hole, 22 ... Cross-girder steel plate, 23 ... Bolt, 24 ... Side concrete layer, 25 ... Battledore, 26 ... Cavity, 27 ... Reinforcing bar

Claims (6)

Using steel girders having upper flange, lower flange, and intermediate flange that protrude from the upper, lower, and middle of the web, respectively, the steel girders are juxtaposed in the bridge width direction, and the intermediate flanges of adjacent steel girders are connected to each other. A concrete inlet is formed between the upper flanges of adjacent steel girders in the butted state, and a floor slab concrete layer is formed between the intermediate flange and the upper flange by concrete cast through the concrete inlet. Floor slab bridge structure. 2. The floor slab bridge structure according to claim 1 , wherein a joint plate is interposed between intermediate flanges of the adjacent steel girders to form the butt state . The side concrete layer which covered the same outer surface between the upper flange and the lower flange of the steel girder outer surface at both ends in the width direction of the road and is integrally formed with the floor slab concrete layer is formed. Floor slab bridge structure. A steel girder having an upper flange and a lower flange projecting from the upper and lower ends of the belly plate to the left and right, respectively, and having an upper intermediate flange and a lower intermediate flange projecting from the middle part of the belly plate to the left and right, respectively. The steel girders are juxtaposed in the bridge width direction, a floor slab concrete layer is formed between the upper intermediate flange and the upper flange, and a reinforced concrete layer is formed between the lower intermediate flange and the lower flange. Characterized floor slab bridge structure. A side concrete layer is formed which covers the outer surface between the upper flange and the lower flange of the outer surface of the steel girder at both ends in the width direction of the road and is integrally formed with the floor slab concrete layer and the reinforced concrete layer. Item 5. A slab bridge structure according to item 4 . The floor slab bridge structure according to claim 1 or 4, wherein the upper flange is embedded in the floor slab concrete layer.

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