JPH10183533A - Bridge girder, bridge girder component, and work execution method for bridge girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate conveyance and work execution, shorten the construction term, lower the manufacture and construction cost, and provide a bridge girder with high rigidity and high durability. SOLUTION: A bridge girder 5 is constituted of a bridge girder component 10 constituted of a square cylindrical main body 9 which is composed of a top flange 11 having holes 17 formed therein, a bottom flange 13, and a web 15, and a stud dowel 19 provided inside face of the web 15, an additional board for connecting to bridge girder components 10 to each other, reinforcements 22, 23 arranged in the bridge component 10, and concrete placed in the bridge component 10. The load bearing strength is further increased if adding a PC steel material thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge girder, a bridge girder constructing the bridge girder, and a method of constructing the bridge girder.

[0002]

2. Description of the Related Art Generally, a bridge is constructed by passing a bridge girder on an abutment and a pier, providing a floor slab thereon, and laying asphalt on the floor slab. Conventional bridge girders include sheet girders, box girders, and pre-beam girders. Sheet girder
The upper flange and the lower flange are connected by one web. In the box girder, an upper flange and a lower flange are connected by two webs, and a portion surrounded by the upper flange, the lower flange, and the two webs is hollow. The sheet girder and the box girder are both made of only steel.
The prebeam girder is constructed by casting concrete around a sheet girder.

[0003] However, since the sheet girder and the box girder are made of only the steel material, the material cost is increased and the manufacturing cost is high. Further, the pre-beam girder has a problem that the production cost is extremely high because it is necessary to assemble a formwork for placing concrete and to remove the formwork after the concrete is solidified.

Conventional bridge girders such as sheet girder, box girder, and pre-beam girder are all very large and have a considerable weight, so that there is a problem that transportation and construction work are very difficult. In particular, when placing a bridge girder on an abutment or pier,
It is necessary to provide temporary materials to temporarily support the bridge girder between the abutment and the pier or between the pier and the pier. For this reason, considerable labor and labor are required, and not only the construction cost is extremely high, but also the construction period becomes long.

[0005] In addition, conventional bridge girders have low rigidity for their size and weight, so that the piers must be arranged at short intervals. For this reason, there is also a problem that the cost is high as the number of piers increases. Although the upper and lower flanges of the sheet girder and the box girder are connected to the web by welding, the heat generated during welding may denature the steel material and adversely affect the durability of the plate girder and the box girder.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is easy to carry and carry out work, has a short construction period, has low production and construction costs, and has a large rigidity. It is another object of the present invention to provide a bridge girder having higher durability, a bridge girder constructing the bridge girder, and a method of constructing the bridge girder.

[0007]

The invention of claim 1 is a bridge girder constructing a bridge girder of a bridge, comprising: a tubular main body;
A bridge girder structure wherein a hole formed in the main body and communicating with the inside is formed.

According to a second aspect of the present invention, there is provided the bridge girder structure according to the first aspect, wherein the main body is made of a steel material.

According to a third aspect of the present invention, in the bridge girder structure according to the second aspect, the main body is formed in a rectangular tube shape by connecting the top plate, the side plate, and the bottom plate, and the hole is formed in the top plate. It is a bridge girder structure characterized by being done.

According to a fourth aspect of the present invention, there is provided the bridge girder structure according to the third aspect, wherein the top plate, the side plates, and the bottom plate are connected by connecting means that can be assembled and disassembled.

According to a fifth aspect of the present invention, there is provided the bridge girder structure according to the fourth aspect, wherein a plurality of holes are formed and arranged at predetermined intervals.

According to a sixth aspect of the present invention, there is provided a bridge girder structure according to the fifth aspect, wherein a support member for supporting a reinforcing bar is provided on an inner surface of the side plate.

According to a seventh aspect of the present invention, there is provided a bridge girder structure having a cylindrical main body and constituting an outer wall, connecting means for connecting the bridge girder structures with each other, a reinforcing bar disposed in the bridge girder structure, A bridge girder comprising a concrete poured into a bridge girder configuration body.

According to an eighth aspect of the present invention, there is provided the bridge girder according to the seventh aspect, wherein a hollow member for forming a space into which concrete does not flow is provided in the main body of the bridge girder structure.

According to a ninth aspect of the present invention, in the bridge girder according to the seventh or eighth aspect, a PC steel material is provided in the bridge girder structure, and a tension is applied to the PC steel material to prestress concrete in the bridge girder structure. It is a bridge girder characterized by the following.

According to a tenth aspect of the present invention, a step of mounting a bridge girder structure having a tubular main body and having a hole formed thereon and constituting an outer wall of the bridge girder on an abutment or a pier, and connecting the bridge girder structures with each other. A method of constructing a bridge girder, comprising: a step; a step of arranging a reinforcing bar in the bridge girder body; and a step of pouring concrete through a hole formed in the bridge girder body.

According to an eleventh aspect of the present invention, a plurality of bottom plates of a bridge girder structure having a main body in which a top plate, side plates, and a bottom plate are connected by connecting means that can be assembled and disassembled, and a hole is formed in the top plate. Connecting the two to each other, mounting the plurality of connected bottom plates on an abutment or a pier, and connecting a side plate and a top plate to the bottom plate mounted on the abutment or a pier to form a bridge girder structure. Connecting the bridge girder structures to each other, arranging a reinforcing bar in the bridge girder structure, and pouring concrete through a hole formed in a top plate of the bridge girder structure. This is the construction method of the bridge girder.

According to a twelfth aspect of the present invention, a step of mounting a bridge girder construct having a cylindrical main body and having a hole formed thereon and constituting an outer wall of the bridge girder on an abutment or a pier, and connecting the bridge girder constructs to each other. A step of arranging a reinforcing bar in the bridge girder structure, and a step of pouring concrete from holes other than the remaining holes, leaving at least one of a plurality of holes formed in a top plate of the bridge girder structure. A method for constructing a bridge girder, comprising:

According to a thirteenth aspect of the present invention, a plurality of bottom plates of a bridge girder having a main body in which a top plate, side plates, and a bottom plate are connected by connecting means that can be assembled and disassembled, and the top plate has a hole formed therein. Connecting the two to each other, mounting the plurality of connected bottom plates on an abutment or a pier, and connecting a side plate and a top plate to the bottom plate mounted on the abutment or a pier to form a bridge girder structure. Connecting the bridge girder members together, arranging reinforcing bars in the bridge girder members, and leaving at least one of a plurality of holes formed in a top plate of the bridge girder members. And a step of pouring concrete from holes other than the holes.

The invention according to claim 14 is the invention according to claims 10 to 13
The method of constructing a bridge girder according to any of the methods for constructing a bridge girder according to any one of claims 1 to 3, further comprising a step of disposing a hollow member for forming a space into which concrete does not flow in at a predetermined position inside the bridge girder structure. is there.

The invention of claim 15 is the invention of claims 10 to 14
Any of the methods for constructing a bridge girder described in (1) above, comprising the step of providing a PC steel material in the bridge girder structure and applying tension to the steel to prestress concrete in the bridge girder structure. Is the way.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bridge girder, a bridge girder structure and a method for constructing a bridge girder according to an embodiment of the present invention will be described with reference to the drawings. 1 to 9 show a bridge girder 5 according to the first embodiment.
It shows. First, the configuration of the bridge 1 including the bridge girder 5 will be described (see FIG. 1). Reference numeral 3 indicates a pier,
A bridge girder 5 is installed on the pier 3, and both ends of the bridge girder 5 are supported by the abutment 2. A plurality of floor slabs 7 are installed on the two piers 5, and asphalt is laid on the floor slab 7, and a balustrade or the like is provided. The outer wall of the bridge girder 5 is formed by connecting a plurality of bridge girder constructs 10.

The construction of the bridge girder structure 10 will be described with reference to FIGS. Reference numeral 9 denotes a rectangular cylindrical main body, which is composed of an upper flange 11 as a top plate, a lower flange 13 as a bottom plate, and two webs 15 as side plates. The upper flange 11, the lower flange 13, and the web 15 are all made of steel. A bolt insertion hole 28 is formed in the upper flange 11, and a bolt insertion hole 30 is formed in the lower flange 13. Upper end 14 and lower end 16 of two webs 15
Is bent at a right angle, and a bolt insertion hole 26 is formed in the upper end portion 14 and the lower end portion 16.

The upper flange 11 is joined to the upper end 14 of the web 15, and the bolt 21 is inserted into the bolt insertion holes 26 and 28.
The upper flange 11 and the web 15 are connected to each other with a nut 20 attached to the bolt 21. The lower flange 13 is joined to the lower end 16 of the web 15, the bolt 21 is inserted into the bolt insertion holes 26 and 30, the nut 20 is attached to the bolt 21, and the lower flange 13 and the web 15 are connected. ing. These bolts 21, nuts 20, and bolt insertion holes 26, 28,
A connection means 30 connects the upper flange 11, the web 15, and the lower flange 13 so that they can be assembled and disassembled.

The upper flange 11 has three oval holes 1.
7 are formed. The holes 17 are arranged at a certain interval from each other. On the inner surface of the web 15, a plurality of stat dowels 19 are provided as support members for supporting the reinforcing bar. The plurality of stat dowels 19 project in directions facing each other. In addition, bridge girder construct 1
A plurality of bolt insertion holes 12 are formed at both ends of the zero. The bridge girder 5 includes a plurality of bridge girder structures 10 as described later.
Are connected, rebars 22 and 23 are arranged inside, and concrete 24 is filled.

A method for constructing the bridge girder 5 will be described. A process of connecting the bridge girder members 10 will be described. As shown in FIG. 4, the end faces of the main bodies 9 of the plurality of bridge girders 10 are joined together, and an attached plate 31 having a bolt insertion hole 32 is brought into contact with the joined portion. The attachment plates 31 are arranged on both the inner surface and the outer surface of the main body 9. Then, the bolts 33 are inserted through the bolt insertion holes 32 of the attachment plate 31 and the bolt insertion holes 12 of the main body 9, and nuts 35 are attached to the bolts 33 and tightened to connect the main bodies 9 of the bridge girder structure 10 together. Bolt insertion holes 12 formed at both ends of main body 9, attached plate 3
1, the bridge 33 and the nut 35
A connecting means for connecting the zeros is configured.

The step of mounting the bridge girder structure 10 on the abutment 2 or the pier 3 and connecting them will be described. The three bridge girder constructs 10 are connected as described above, and this is lifted by the crane 41 as shown in FIGS.
Or install it on pier 3. Since the bridge girder structure 10 is rectangular and lightweight, the work of lifting and placing the bridge girder structure 10 with the crane 41 can be performed relatively easily. Then, the bridge girder constructs 10 installed on the abutment 2 or the pier 3 are connected to each other in the same manner as described with reference to FIG.

The reinforcing bar 22 and the reinforcing bar 23 are provided in the bridge girder structure 10.
Will be described. Both ends of the reinforcing bar 22 are placed on the stat dowel 19. Next, the plurality of reinforcing bars 23 are placed on the reinforcing bars 22, arranged in a direction extending in the longitudinal direction of the bridge girder structure 10, and intersecting portions between the reinforcing bars 22 and the reinforcing bars 23 are connected by wire or the like. The reinforcing bars 23 may be arranged at regular intervals or at irregular intervals.

The step of pouring the concrete 24 will be described (see FIG. 7). Concrete 24 is poured from the end hole 17 of the plurality of bridge girder structures 10 placed on the abutment 2 and the pier 3, and when a portion corresponding to the hole 17 is filled with the concrete 24, the hole 25 is closed by the lid 25.
Close up. Then, the concrete 24 is poured into the hole 17 next to the hole 17 closed by the lid 25. The concrete 24 is poured sequentially, and the entire inside of the bridge girder structure 10 is filled with the concrete 24. Concrete 24
In the bridge girder structure 10, the air in the bridge girder structure 10 flows out of the holes 17 other than the holes 17 into which the concrete 24 is poured, so that the concrete 24 can be smoothly supplied into the bridge girder structure 10.

When the concrete 24 is solidified, the concrete 24, the bridge girder structure 10 and the reinforcing bars 22, 23 are integrated to form a composite structure, which has high rigidity and is smaller and lighter than the conventional bridge girder. Therefore, the interval between the piers 3 can be made longer than when a conventional bridge girder is used, and the number of piers can be reduced. Since the stat dowel 19 is buried in the concrete 24, the web 15 and the concrete 24 are connected more firmly. Also, the main body 9 of the bridge girder structure 10
However, since it constitutes the outer wall of the bridge girder 5, it is not necessary to form or remove the concrete formwork.
Further, the bridge girder 5 can be constructed without providing a temporary material.

Another method of installing the bridge girder structure 10 on the abutment 2 and the pier 3 will be described with reference to FIGS.
Only the lower flanges 13 are attached to each other as described above.
1, the bolt 33 and the nut 35 are connected, and only the connected lower flange 13 is placed on the abutment 2 and the pier 3. Then, the lower flange 13 is connected to the web 15 and the upper flange 11 using the bolt 21 and the nut 20. To complete the bridge girder structure 10. According to this method,
Since the bridge girder structure 10 can be easily lifted by the crane 41 for each component in a state where the bridge girder structure 10 is disassembled, it is possible to work even with a crane having a relatively small lifting weight.

FIG. 10 shows a bridge girder 5 according to the second embodiment.
FIG. In the figure, reference numeral 53 denotes a round pipe as a hollow member, and the round pipe 53 is constituted by a so-called spiral pipe or the like. Round pipe 53 has leg 5
5 and is disposed substantially at the center of the bridge girder structure 10.

In the bridge girder 51, the concrete 24 does not flow into the round pipe 53, and a space without the concrete 24 is formed inside the round pipe 53. Therefore, bridge girder 5
1 will be lighter. However, the vicinity of the upper flange 11 and the lower flange 13 of the bridge girder 51 is in a state where the concrete 24 is filled. Since the bridge girder 51 receives a load from the floor slab 7 or the like from above, the upper flange 11
A large stress is generated in the vicinity and near the lower flange 13. Therefore, the concrete 24 is formed by the round pipe 53.
Even if a space having no gap is formed, the strength of the bridge girder 51 is not adversely affected.

FIG. 11 shows a modification 61 of the bridge girder shown in FIG. In this bridge girder 61, a square pipe 63 is disposed at substantially the center in the bridge girder structure 10 and supported by legs 55. The bridge girder 61 can be reduced in weight similarly to the bridge girder 51.

FIGS. 12 and 13 show a bridge girder 71 according to a third embodiment of the present invention.
In the above, a prestress is given to the concrete 24 by passing a PC steel material inside and applying tension to the PC steel material.

In the figure, reference numeral 73 denotes a PC steel material such as a PC steel rod, a PC steel strand, a PC steel wire, a PC hard steel wire, and the like. The PC steel material 73 is passed through the concrete 24 in a direction extending along the longitudinal direction of the bridge girder 71, and is arranged in five rows on the right and left and three levels in the top and bottom. And in the PC steel 73,
It is pre-tensioned to have a strong force to shorten the length. How to apply this tension, post tension method to be performed after the concrete is hardened, or
Any of the pretensioning methods performed before the concrete hardens may be used. (The drawing shows an example of construction using the post tension method.)

Thus, a compressive force is applied to the concrete 24 by the contraction force of the PC steel material 73, and the compressive force reduces the tensile stress generated by the dead load and the live load applied to the bridge girder 71.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and there is a change in design without departing from the gist of the present invention. Are also included in the present invention. For example, the main body 9 of the bridge girder structure 10 according to the above-described embodiment includes the upper flange 11, the lower flange 13, and the web 15 connected to the bolt 2.
1. Although the connection is made by using the nut 20, the present invention is not limited to this, and the connection can be made by welding.

When the concrete 24 is poured into the holes 17, the concrete 24 may be poured into the plurality of holes 17 at the same time if the air in the main body 9 can be released. The main body 9 is not limited to a rectangular tube shape, but may have another shape, for example, a cylindrical shape. The hole 17 is not limited to an elliptical shape, but may be a circular or rectangular shape.

[0040]

As described above, according to the present invention, unlike conventional sheet girders and box girders, the present invention is made of steel and concrete, so that material costs can be reduced. Unlike the pre-beam girder, there is no need to form or remove a formwork for placing concrete.
Therefore, the manufacturing cost can be reduced as compared with the conventional bridge girder. And, in the method of constructing a bridge girder of the present invention, the bridge girder constructing the outer wall of the bridge girder is connected one by one or several sets, and then placed on a pier or abutment and sequentially connected. Going, or connecting only the bottom plate that constitutes the bridge girder first, and then assembling the side plate and top plate, so it is significantly smaller and lighter than the conventional bridge girder construction method Transportation, etc.,
Therefore, it is possible to easily carry and carry the bridge girder. Further, since the work of transporting and constructing the bridge girder can be easily performed, the construction period can be shortened.

Since the bridge girder structure, the reinforcing bar and the concrete are integrated to form a composite structure, a large rigidity can be obtained. Therefore, the piers can be arranged at long intervals, and the number of piers can be reduced as compared with the related art, so that the cost of the bridge can be reduced.

If the top plate, the bottom plate and the side plates constituting the bridge girder are fastened by means other than welding, the deformation of the steel material due to heat during welding can be eliminated, and there is no risk of adversely affecting the durability of the bridge. .

A PC steel material is passed through the bridge girder structure,
By prestressing the concrete in the bridge girder structure by applying tension to the steel material, the load bearing strength can be increased without increasing the weight substantially.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a bridge using a bridge girder according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the bridge girder structure according to the embodiment of the present invention in a state in which a reinforcing bar is arranged inside.

FIG. 3 is an enlarged sectional view taken along the line AA of FIG. 2;

FIG. 4 is a partially cutaway perspective view showing a main part of the bridge girder structure shown in FIG.

FIG. 5 is a schematic diagram showing an initial stage in the method for constructing a bridge girder of the present invention.

FIG. 6 is a schematic diagram showing a final stage in the method for constructing a bridge girder of the present invention.

FIG. 7 is a schematic view showing a step of pouring concrete in the method for constructing a bridge girder of the present invention.

FIG. 8 is a schematic view showing another example of the method for constructing a bridge girder according to the present invention.

9 is a schematic view showing a bridge girder in a state completed by the bridge girder construction method shown in FIG. 8;

FIG. 10 is a sectional view of a bridge girder according to the second embodiment of the present invention.

11 is a sectional view showing a modification of the bridge girder shown in FIG.

FIG. 12 is a vertical sectional view of a main part of a bridge girder according to a third embodiment of the present invention.

FIG. 13 is an enlarged sectional view taken along line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge 2 Abutment 3 Bridge pier 5 Bridge girder 9 Main body 10 Bridge girder structure 11 Top plate 13 Bottom plate 15 Side plate 17 Hole 19 Support member 20 for supporting a reinforcing bar 20, 21, 26, 28, 30 Connecting means 22 Reinforcing bar 23 Reinforcing bar 24 Concrete 51 Bridge beam 53 Hollow member 61 Bridge girder 63 Hollow member 71 Bridge girder 73 PC steel

Claims (15)

[Claims] 1. A bridge girder constructing a bridge girder of a bridge, comprising a cylindrical main body and a hole formed in the main body and communicating with the inside thereof. 2. The bridge girder structure according to claim 1, wherein the main body is made of a steel material. 3. The bridge girder structure according to claim 2, wherein the main body is formed in a rectangular tube shape by connecting a top plate, a side plate, and a bottom plate, and a hole is formed in the top plate. The bridge girder structure that is the feature. 4. The bridge girder structure according to claim 3, wherein the top plate, the side plate and the bottom plate are connected by connecting means that can be assembled and disassembled. 5. The bridge girder structure according to claim 4, wherein a plurality of holes are formed and are arranged at predetermined intervals. 6. The bridge girder structure according to claim 5, wherein a support member for supporting a reinforcing bar is provided on an inner side surface of the side plate. 7. A bridge girder having a cylindrical main body and constituting an outer wall, connecting means for connecting the bridge girder structures, a reinforcing bar disposed in the bridge girder structure, and pouring into the bridge girder structure. A bridge girder made of recycled concrete. 8. The bridge girder according to claim 7, further comprising a hollow member for forming a space into which concrete does not flow, in the main body of the bridge girder structure. 9. The bridge girder according to claim 7, wherein a PC steel material is provided in the bridge girder structure, and prestress is applied to concrete in the bridge girder structure by applying tension to the PC steel material. Bridge girder. 10. A step of mounting a bridge girder construct having a cylindrical main body and having a hole formed therein and constituting an outer wall of the bridge girder on an abutment or a pier; a step of connecting the bridge girder constructs to each other; A method for constructing a bridge girder, comprising a step of arranging a reinforcing bar in a constituent body and a step of pouring concrete through a hole formed in the bridge girder constituent body. 11. A plurality of bottom plates of a bridge girder comprising a top plate, side plates and a bottom plate which are connected by connecting means which can be disassembled and disassembled, and having a main body having a hole formed in said top plate. A step of mounting the plurality of connected bottom plates on an abutment or pier; a step of connecting a side plate and a top plate to the bottom plate mounted on the abutment or pier to form a bridge girder structure; A method for constructing a bridge girder, comprising: a step of connecting together, a step of arranging a reinforcing bar in the bridge girder body; and a step of pouring concrete through a hole formed in a top plate of the bridge girder body. 12. A step of mounting a bridge girder structure having a cylindrical main body and having a hole formed thereon and constituting an outer wall of the bridge girder on an abutment or a pier; a step of connecting the bridge girder structures to each other; Arranging a reinforcing bar in the component body, and leaving at least one of a plurality of holes formed in the top plate of the bridge girder component, and pouring concrete through holes other than the remaining holes. Characteristic bridge girder construction method. 13. A plurality of bottom plates of a bridge girder comprising a top plate, side plates, and a bottom plate which are connected by connecting means capable of being disassembled and disassembled, and having a main body having a hole formed in said top plate. A step of mounting the plurality of connected bottom plates on an abutment or pier; a step of connecting a side plate and a top plate to the bottom plate mounted on the abutment or pier to form a bridge girder structure; Connecting together, arranging a reinforcing bar in the bridge girder structure, leaving at least one of a plurality of holes formed in a top plate of the bridge girder structure, and removing holes from holes other than the remaining holes. A method for constructing a bridge girder, comprising a step of pouring concrete. 14. A method for constructing a bridge girder according to any one of claims 10 to 13, further comprising the step of disposing a hollow member for forming a space into which concrete does not flow in at a predetermined position inside the bridge girder structure. A method of constructing a bridge girder characterized by the following. 15. A method according to claim 10, wherein a prestress is applied to concrete in the bridge girder structure by providing a PC steel material in the bridge girder structure and applying tension thereto. A method for constructing a bridge girder, comprising: