JP2943111B1 - Bridge girder, bridge girder construct and bridge girder construction method - Google Patents

Abstract

[PROBLEMS] A bridge girder that is easy to transport and perform construction work, has a short construction period, is low in manufacturing and construction costs, has high rigidity, and has high durability, and a bridge girder constituting this bridge girder. And a method for constructing the bridge girder. SOLUTION: A double wall portion 32 composed of a hollow outer wall portion 30 and an inner wall portion 31 located inside the outer wall portion 30 forms an outer peripheral edge portion 34 and is formed at a center. A hollow bridge girder structure 9 in which a hollow portion 35 is formed, wherein a frame is formed in a space region 36 formed by the outer wall portion 30 and the inner wall portion 31 of the bridge girder structure 9. Bridge girder structure 9 in which body 37 is inserted.

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 further laying asphalt on the floor slab. Referring to FIG.
An outline of a configuration of a bridge 1 using a conventional bridge girder and a construction method thereof will be described.

That is, as can be understood from FIG.
A plurality of bridge girders 5 are placed between the bridge piers 3 or between the piers 3 so as to be arranged in parallel at a predetermined interval from each other. Floorboard 7
Is mounted. Further, on the floor plate 7,
Asphalt or the like is constructed, and a balustrade is provided on the floorboard 7 if necessary.

In the conventional bridge 1, for example, the bridge girder 5 has a structure in which a plurality of bridge girder units 10 are connected to each other by a connecting portion 4. Further, each of the bridge girder units 10 is formed in a square cylindrical body by concrete 24 including a reinforcing bar 23, and in some cases,
The periphery is surrounded by an upper flange portion 11 as a top plate, a lower flange portion 13 as a bottom plate, and two webs 15 forming left and right side walls, and the like, which are formed of, for example, steel. Is also good.

[0005] As such a conventional bridge girder, a plate girder, a box girder, and a pre-beam girder are used. In the sheet girder, an upper flange and a lower flange are connected by a single web. In the box girder, an upper flange and a lower flange are connected by two webs, and a portion where the upper flange and the lower flange are surrounded by the two webs is hollow. Both the sheet girder and the box girder are made of only steel.

The pre-beam girder is constructed by casting concrete around a sheet girder. However, in the conventional bridge girder, since the plate girder and the box girder are made of only steel, the material cost is high 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 has solidified.

The sheet girder in the conventional bridge girder structure,
Since the bridge girder consisting of the box girder and the pre-beam girder are both very large and have a considerable weight, the transportation and construction work is very difficult, and the cost is high and the work is complicated. However, there is a problem that the danger increases. In particular, in the work of mounting the bridge girder on the abutment or the pier, it is necessary to provide a temporary material for temporarily supporting the 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.

Further, since the conventional bridge girder has low rigidity for its size and weight, 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.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the above-mentioned drawbacks of the prior art, to facilitate transportation and construction work, to shorten the construction period, to reduce the production and construction costs, and to increase the cost. An object of the present invention is to provide a bridge girder having rigidity and higher durability, a bridge girder constructing the bridge girder, and a method of constructing the bridge girder.

[0010]

In order to achieve the above-mentioned object, the present invention employs the following basic technical configuration. That is, as a first aspect according to the present invention, a double wall portion including a hollow outer wall portion and an inner wall portion located inside the outer wall portion forms an outer peripheral edge portion. And a hollow bridge girder structure having a hollow portion formed at the center thereof, wherein a skeleton body is formed in a space region formed by the outer wall portion and the inner wall portion of the bridge girder structure. It is a bridge girder structure inserted, and a second aspect according to the present invention includes a hollow outer wall portion and an inner wall portion located inside the outer wall portion. A hollow bridge girder structure in which a double wall portion forms an outer peripheral edge portion and a hollow portion is formed in a center portion, wherein the outer wall portion and the inner wall portion of the bridge girder structure are The bridge girder in which concrete is poured into the space region of the structure in which the skeleton is inserted into the formed space region.

Further, according to a third aspect of the present invention, there is provided:
A method for constructing a bridge girder, comprising the steps of: mounting the bridge girder structure on an abutment or a pier; and injecting concrete into the space region of the bridge girder structure.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The bridge girder structure, the bridge girder and the method for constructing the bridge girder according to the present invention employ the technical structure as described above. By having the structure constituted by the prismatic body of the above, unlike the conventional sheet girder or box girder, the structure is made of steel and concrete, so that the material cost can be reduced. Also, unlike the pre-beam girder, there is no need to form or remove a formwork for placing concrete. Therefore, the production cost can be reduced as compared with the conventional bridge girder.

Furthermore, since the work of transporting the bridge girder and the construction work can be easily performed, the construction period and construction cost can be greatly reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some specific examples of a bridge girder structure and a bridge girder according to the present invention and a method for constructing the bridge girder will be described below in detail with reference to the drawings. That is, FIG. 1 is a perspective view showing a configuration of a specific example of the bridge girder structure 9 according to the present invention,
In the figure, a double wall portion 32 composed of a hollow outer wall portion 30 and an inner wall portion 31 located inside the outer wall portion 30 forms an outer peripheral edge portion 34 and has a central portion. Hollow part 3
5 is a hollow bridge girder structure 9 in which a skeleton body 37 is inserted into a space region 36 formed by the outer wall portion 30 and the inner wall portion 31 of the bridge girder structure 9. The bridge girder structure 9 shown is shown.

In the present invention, concrete is poured into the space region 36 formed in the bridge girder 5 in a later step. The outer wall portion 30 used for the bridge girder structure 9 according to the present invention.
Outer wall 30 seen in a direction perpendicular to the longitudinal axis L of
Preferably has one shape selected from among a circle, an ellipse, a rectangle, a trapezoid, and a polygon.

The cross-sectional shape of the inner wall 31 used in the bridge girder structure 9 according to the present invention as viewed in a direction perpendicular to the longitudinal axis L of the inner wall 31 is the outer wall. It is desirable to have a shape similar to the cross-sectional shape of the body part 30 or a shape different therefrom. That is, in the specific example of FIG. 1, the cross-sectional shape of the outer wall portion 30 is rectangular, and the cross-sectional shape of the inner wall portion 31 is also rectangular. The cross-sectional shape of the wall portion 31 is the same as the cross-sectional shape of the outer wall portion 30, but the area is smaller than the area of the cross-sectional shape of the outer wall portion 30. It has become.

In the present invention, the cross-sectional shapes of the outer wall 30 and the inner wall 31 are not limited to the similar shapes, but may be different from each other. For example, as shown in FIG.
It is also possible that the cross-sectional shape of the inner wall 31 is circular while the cross-sectional shape of 0 is square.

FIG. 7 shows an example in which the cross-sectional shapes of the outer wall 30 and the inner wall 31 are trapezoidal shapes similar to each other, and FIG. An example in which the cross-sectional shapes are circular shapes that are similar to each other is shown. In the present invention, for example, as shown in FIG. 9B, at least the cross-sectional shape of the internal wall portion 31 is
In the case of a polygon, it is desirable to provide a truss structure 38 in the hollow portion 35 formed by the internal wall portion 31.

In the present invention, the bridge girder structure 9
A frame 37 is disposed in the space region 36, and the frame 37 is selected from a steel material, a metal material, a plastic material, or a plastic composite (FRP) containing a fiber material such as carbon fiber. It is desirable that it be composed of only one material. The outer wall portion 30 and the inner wall portion 31 are made of one material selected from a steel material, a metal material, a plastic material, a plastic composite (FRP) containing a fiber material such as carbon fiber, wood, or the like. It is desirable that it be composed.

Further, in the present invention, the skeleton body 37
The cross-sectional shape of the skeleton body 37 at a right angle to the longitudinal axis l has, for example, one cross-sectional shape selected from an H-shape, an O-shape, an L-shape, a groove-shape, and a polygon-shape. Is preferred. Since the bridge girder structure 9 according to the present invention is for pouring concrete into the space area 36 as described later, the bridge girder structure 9 in the bridge girder structure 9 is designed to prevent the concrete from leaking outside. At both ends 39 provided along the longitudinal axis L of the main body of the bridge girder structure 9, it is preferable that an additional plate 40 that covers at least the space region 36 is disposed.

FIG. 2 shows a cross-sectional structure of the bridge girder structure 9 in this specific example as viewed in a direction perpendicular to the longitudinal axis L of the main body. In this specific example, the frame 37 has a cross section of H-shape. In addition, as a specific example of the whole structure of the skeleton body 37 in the present invention, a structure as shown in FIGS. 5A and 5B can be considered.

However, when the outer wall portion 30 and the inner wall portion 31 have a cross-sectional shape other than a rectangular shape, a frame as shown in FIGS. 3
7 is used as appropriate. Further, in the present invention, a reinforcing rib portion 41 having an appropriate shape may be provided in order to improve the strength of the frame body 37.

On the other hand, in the bridge girder structure 9 according to the present invention, the skeleton body 37 is arranged in a free state in the space area 36 until concrete, which will be described later, is poured. Therefore, it is inconvenient for transportation and construction work. Therefore, the skeleton body 37 is provided with at least one of the outer wall body part 30 or the inner wall body part 31 through an appropriate number of stat dowel parts 42. It is desirable to be fixedly held in a part.

Further, in the bridge girder structure 9 according to the present invention, in order to improve the tensile strength of the bridge girder structure 9 in the longitudinal direction of the main body, the frame body 37 or the reinforcing rib portion 41 is used. Alternatively, it is desirable that at least a part of the stat dowel portion 42 be provided with a reinforcing bar portion 43 arranged in the same direction as the longitudinal direction of the bridge girder structure 9.

FIG. 6 is a partially enlarged view of a specific example of the bridge girder structure 9 according to the present invention. As can be understood from FIG. 6, a state in which an appropriate number of reinforcing bars 43 are temporarily fixed to some of the reinforcing ribs 41 and the stat dowels 42 by appropriate means such as welding or welding. It is arranged in.

In the bridge girder structure 9 according to the present invention, it is desirable that an opening 44 for injecting concrete is provided in a part of the outer wall 30 or the inner wall 31. . In addition, it is desirable that an air vent hole 45 is provided in a part of the outer wall 30 or the inner wall 31 of the bridge girder structure 9 according to the present invention.

Further, in the bridge girder structure 9 according to the present invention, a partition plate 46 is provided in the space region 36, whereby the space region 36 is divided into a plurality of compartments 47, Preferably, it is divided into 48. Therefore, in the above specific example of the present invention, the compartment 4
In each of 7 and 48, an opening 4 for concrete injection
4 and an air vent hole 45 are desirably provided.

On the other hand, a fixing member for connecting and fixing the end 39 of the main body of another bridge girder structure 9 to at least one end 39 in the longitudinal direction of the main body of the bridge girder structure 9 according to the present invention. Preferably, 49 is provided. The structure of the fixing member 49 is not particularly limited, but conventionally known connecting means can be used.

The bridge girder 5 according to the present invention has a structure in which appropriate concrete is poured into the space region 36 of the bridge girder structure 9 having the above-described configuration and hardened. When the concrete is injected into the bridge girder structure 9 according to the present invention, the concrete may be injected from the opening 44 provided at a substantially central portion of each bridge girder structure 9. The concrete may be injected from the openings 44 provided at two positions close to both ends 39 in the longitudinal direction of the main body of the structure 9.

In the case where the compartments 47 and 48 are provided in the space region 36 of the bridge girder structure 9, it is preferable to inject the concrete by the method described above for each compartment. The method of injecting the concrete into the bridge girder structure 9 according to the present invention may be performed in an assembly factory of the bridge girder structure 9, and preferably, the bridge girder structure 9 is connected to the pier 3.
It is better to execute it after mounting it on the like.

The outer wall portion 30 and the inner wall portion 31 of the bridge girder structure 9 according to the present invention are formed by the upper flange portion 11 as a top plate as described in the conventional bridge girder structure 9. ,
A lower flange portion 13 as a bottom plate and two webs 15 forming left and right side wall portions are formed. Next, a method for constructing the bridge girder 5 according to the present invention will be described with reference to FIGS.

First, at a factory or a construction site where the bridge girder structure 9 is manufactured, a plurality of bridge girder structures 9 are connected, and a predetermined length is set according to the length of the bridge and the situation of the site. The bridge girder is formed, and as described above, using the connecting means 49 provided at the end 39 of each bridge girder structure 9,
The end face of the bridge girder structure body 9 and the skeleton 37 are connected to each other by welding or bolts.

After that, as shown in FIGS. 3 and 4, the connected bridge girder structure 9 is lifted up by a crane 50 and placed on the abutment 2 or the pier 3. Since the bridge girder structure 9 is, for example, rectangular tube-shaped and lightweight, the bridge girder structure 9
Can be relatively easily lifted by the crane 50. After that, the space area 36 in the plurality of bridge girder structures 9 placed on the abutment 2 and the pier 3
First, concrete is first poured or poured into one of the compartments 47, 48 formed in, for example, the compartment 47 formed on the upper side of the bridge girder structure 9.

After the concrete is solidified, concrete is poured or poured into the remaining compartments 48.
As described above, the concrete 55 is cast in two separate steps because the bridge girder structure 9 has rigidity at that time by solidifying only the upper surface after the first cast and the remaining concrete is cast. This is because it is not necessary to support the bridge girder structure 9 with a bridging material or the like when driving 55.

When the concrete 55 is solidified, the concrete 55, the bridge girder structure 9, the frame 37, and the reinforcing bar 43 are integrated to form a rigid structure, which has a large rigidity, and is smaller and lighter than a conventional bridge girder. So you can
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. Also, since the main body of the bridge girder 9 constitutes the outer wall of the bridge girder 5,
There is no need to build or remove concrete formwork.

Further, the bridge girder structure 9 can be constructed without providing any temporary materials. That is, as a method of constructing a bridge girder according to the present invention, basically, a step of erection and mounting the bridge girder structure 9 having the above-described configuration on an abutment or a pier and in the space region of the bridge girder structure In another embodiment, a plurality of the bridge girder structures 9 are arranged in series in a certain direction and are adjacent to each other, and the respective bridge girder structures are connected to each other. A step of connecting adjacent ends to each other, a step of mounting and mounting the connected bridge girder structure on an abutment or a pier, and a step of injecting concrete into the space region of each bridge girder structure. It is the construction method of the bridge girder that is being done.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the design may be changed without departing from the scope of the present invention. Are also included in the present invention.

[0038]

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. Also, unlike the pre-beam girder, there is no need to form or remove a formwork for placing concrete. Therefore, the production cost can be reduced as compared with the conventional bridge girder.

Furthermore, since the work of transporting the bridge girder and the work of construction can be easily performed, the construction period and construction cost can be greatly reduced. Since the bridge girder structure 9, the reinforcing bar 43, the frame 37, and the concrete 55 are integrated to form a composite structure, a large rigidity can be obtained. Therefore, the piers 3 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 1 can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a configuration of a specific example of a bridge girder structure of the present invention.

FIG. 2 is a cross-sectional view showing a cross-sectional structure of a specific example of the bridge girder structure of the present invention.

FIG. 3 is a diagram illustrating a state in which the bridge girder components of the present invention are constructed in a connected state.

FIG. 4 is a schematic view showing a method for constructing a bridge girder according to the present invention.

FIG. 5 is an assembly view of a specific example of the skeleton according to the present invention.

FIG. 6 is a partially detailed cross-sectional view of a specific example of the bridge girder structure of the present invention.

FIG. 7 is a cross-sectional view showing the configuration of another specific example of the bridge girder structure of the present invention.

FIG. 8 is a sectional view showing a sectional structure of another specific example of the bridge girder structure of the present invention.

FIG. 9 is a cross-sectional view showing a cross-sectional structure in still another specific example of the bridge girder structure of the present invention.

FIG. 10 is a partial perspective view showing a bridge using a conventional bridge girder structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bridge 2 ... Abutment 3 ... Bridge pier 5 ... Bridge girder 7 ... Floor slab 9 ... Bridge girder structure 10 ... Bridge girder structure unit 11 ... Upper flange 13 ... Lower flange 15 ... Web 23 ... Reinforcing steel 24 ... Concrete 30 ... External wall part DESCRIPTION OF SYMBOLS 31 ... Internal wall part 32 ... Double wall part 34 ... Peripheral edge 35 ... Hollow part 36 ... Space area 37 ... Framed body 38 ... Truss structure 39 ... Bridge girder structure end part 40 ... Attached plate 41 ... Reinforcing rib Part 42: Stat dowel part 43 ... Reinforcing part 44 ... Opening for concrete injection 45 ... Air vent hole part 46 ... Partition plate 47, 48 ... Separator 49 ... Connection fixing member 50 ... Crane 55 ... Concrete

Claims (23)

(57) [Claims] 1. A double wall comprising a hollow outer wall portion and an inner wall portion located inside the outer wall portion forms an outer peripheral edge, and a hollow portion is formed at a center portion. Is formed in a hollow bridge girder structure, wherein a frame is inserted into a space region formed by the outer wall portion and the inner wall portion of the bridge girder structure. Bridge girder structure. 2. The bridge girder structure according to claim 1, wherein concrete is poured into the space area. 3. A cross section of the outer wall portion viewed in a direction perpendicular to a longitudinal axis of the outer wall portion is circular, elliptical, or the like.
The bridge girder structure according to claim 1, wherein the bridge girder structure has one shape selected from a rectangle, a trapezoid, and a polygon. 4. A cross-sectional shape of the inner wall portion viewed in a direction perpendicular to a longitudinal axis of the inner wall portion has a shape similar to or different from the cross-sectional shape of the outer wall portion. The bridge girder structure according to any one of claims 1 to 3, wherein the bridge girder structure is provided. 5. The truss structure is provided in the hollow formed by the internal wall when the internal wall has a polygonal cross-sectional shape. Bridge girder structure. 6. The frame is made of one material selected from a steel material, a metal material, a plastic material, a plastic composite (FRP) containing a fiber material such as carbon fiber, wood, or the like. The bridge girder structure according to any one of claims 1 to 5, wherein 7. The cross-sectional shape of the skeleton body at a right angle to the longitudinal axis has one cross-sectional shape selected from H type, O type, L type, groove type, polygon type, and the like. The bridge girder structure according to any one of claims 1 to 6, wherein 8. The bridge girder structure according to claim 1, wherein a rib portion for reinforcement is formed in a part of the frame body. 9. The skeleton body is fixedly held on at least a part of either the outer wall portion or the inner wall portion via an appropriate number of stat dowel portions. The bridge girder structure according to any one of claims 1 to 8, wherein 10. The structure according to claim 1, wherein at least a part of the skeleton or the stud part has a reinforcing bar arranged in the same direction as a longitudinal direction of the bridge girder structure. 10. The bridge girder structure according to any one of 9. 11. The bridge girder structure according to claim 1, wherein an opening for injecting concrete is provided in a part of the outer wall portion or the inner wall portion. . 12. The bridge girder structure according to claim 1, wherein an air vent hole is provided in a part of the outer wall portion or the inner wall portion. 13. The device according to claim 1, wherein a partition plate is provided in the space region, whereby the space region is divided into a plurality of compartments. Bridge girder structure. 14. The bridge girder structure according to claim 12, wherein each of the compartments is provided with an opening for injecting concrete and an air vent hole. 15. A fixing member for connecting and fixing an end of another main body of a bridge girder structure to at least one end in a longitudinal direction of the main body of the bridge girder structure. The bridge girder structure according to any one of claims 1 to 14. 16. An attachment plate for covering at least the space area is disposed at both ends in the longitudinal direction of the main body of the bridge girder structure.
The bridge girder structure according to any one of the above. 17. A double wall portion comprising a hollow outer wall portion and an inner wall portion located inside the outer wall portion forms an outer peripheral edge, and a hollow portion is provided at a center portion. Is formed in the hollow bridge girder structure, wherein the frame body is inserted into a space region formed by the outer wall portion and the inner wall portion of the bridge girder structure. A bridge girder characterized by the fact that concrete is injected into the space. 18. A step of mounting the bridge girder structure according to claim 1 on an abutment or a pier and injecting concrete into the space region of the bridge girder structure. A method of constructing a bridge girder, comprising: 19. A step of arranging a plurality of the bridge girder structures in series in a certain direction and connecting the adjacent ends of the respective bridge girder structures to each other, wherein the connected bridge girder structures are connected to each other. 19. The method for constructing a bridge girder according to claim 18, comprising: a step of erection and mounting on an abutment or a pier; and a step of injecting concrete into the space region of each bridge girder structure. 20. The method according to claim 18, wherein when the concrete is poured into the bridge girder structure, the concrete is poured from a central portion of each bridge girder structure. 21. The concrete according to claim 18, wherein when the concrete is poured into the bridge girder structure, the concrete is poured from two positions near both ends in the longitudinal direction of the main body of each bridge girder structure. 19. The method for constructing a bridge girder according to item 19. 22. When the concrete is injected into the bridge girder structure, the concrete is injected into each of the compartments formed in the space region provided in each bridge girder structure. 20. The method for constructing a bridge girder according to 18 or 19. 23. When injecting the concrete into the bridge girder structure, when there are a plurality of the compartments formed in the space region provided in the bridge girder structure, the bridge girder structure 20. The method according to claim 19, wherein the concrete is first injected into the compartment located above the center, and the concrete is injected into the compartment located below the compartment. 22. The construction method of a bridge girder according to any one of 22.