JP3844329B2 - Construction girder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction girder used when a structure under a track is constructed by an open-cut method.
[0002]
[Prior art]
When constructing the structure under the track by the open-cut method, it is conceivable that the track is temporarily received with a sleeper-embedded construction girder. As shown in Fig. 4, this construction method lays a temporary pile into the ground and constructs a temporary girder, then constructs a main girder on both sides of the track and passes a horizontal girder between existing sleepers. This is a construction method for constructing a structure by constructing a sleeper-embedding construction girder that is inserted and temporarily received, and then excavating under the track.
[0003]
FIGS. 5A and 5B are diagrams for explaining a construction girder. FIG. 5A is a cross-sectional view orthogonal to the track, and FIG. 5B is a cross-sectional view taken along line AA in FIG. As shown in the figure, the construction girder is mainly a steel main girder having an I-shaped cross section welded with a steel plate, and a steel cross girder with a U-shaped cross section welded with a steel plate for inserting a wooden row sleeper 4 for receiving a rail 3. 2 and a steel shelf board 5 welded to the belly plate of the main girder for mounting the cross girder. In the drawing, the portion indicated as a welded portion is a welded portion, and the left side of the drawing shows a fulcrum portion, and the right side shows an intermediate portion. Yes. As described above, the main girder, the cross girder, and the shelf board are each welded with a steel plate, and the cross beam and the shelf board are fixed with high-strength bolts.
[0004]
[Problems to be solved by the invention]
However, the conventional construction girder has a structure in which the main girder, the horizontal girder, and the shelf board are each manufactured by welding steel plates, and the amount of welding is high, which increases costs and causes welding distortion. was there.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a construction girder that does not require welding and can reduce the cost.
[0005]
[Means for Solving the Problems]
The present invention relates to a construction girder composed of a main girder, a cross girder for inserting a sleeper, and a shelf board mounted on the main girder for placing a cross girder. Is formed by overlapping two L-shaped steels to form a U-shaped cross section for inserting a sleeper and fastening with high-strength bolts, and the shelf board is attached to the main girder belly plate with high-strength bolts It is characterized by comprising.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
1A and 1B are diagrams for explaining an example of a construction beam according to the present invention. FIG. 1A is a cross-sectional view orthogonal to the track, and FIG. The main girder 10 having an I-shaped cross section, the cross girder 11 for inserting the bridge sleeper 13 for receiving the rail 3, and the shelf board 14 for placing the cross girder are the same as in FIG. The left side of FIG. 5 shows the fulcrum part and the right side shows the intermediate part. In the fulcrum part, the end stiffener 16 is attached to the main girder 10 as in the case of FIG.
[0007]
Unlike the conventional method in which a main girder is manufactured by welding steel plates, a main girder 10 made of a shape steel such as an H-section steel or a very thick H-section steel is used. Unlike the conventional method of welding a steel plate to a cross beam, two angle steels (L-shaped steel) 11a and 11b are overlapped and fastened with a driving type high strength flat head bolt 12 to form a U-shaped cross section. In the illustrated example, a bridge sleeper 13 for a bridge is inserted. Unlike the conventional method in which a shelf plate is welded to a main girder plate by attaching a steel plate, an angle steel (L-shaped steel) 14 is attached with a high-strength bolt 15. The high-strength bolts 15 are used to attach the cross beams to the shelf boards, and the end stiffeners 16 at the fulcrum portions are also joined by the high-strength bolts 15. Thus, the main girder, the horizontal girder, and the shelf board can all be manufactured using shape steel and high-strength bolts without using welding.
[0008]
FIG. 2 is a view showing another example of the construction beam of the present invention, FIG. 2 (a) is a cross-sectional view orthogonal to the track, FIG. 2 (b) is a cross-sectional view taken along line AA of FIG. The same numbers as those in FIG. 1 indicate the same contents.
This example is different from FIG. 1 only in that the average sleeper 4 has a smaller cross section than the bridge sleeper, so that an H-shaped steel 21 is used for the cross beam and the sleeper is inserted inside thereof. This is the same as in FIG. A part of the flange 21b is cut so that the web portion 21a at the end of the H-shaped steel 21 is placed on the shelf board.
[0009]
FIG. 3 is a view showing another example of the construction beam of the present invention, FIG. 3 (a) is a cross-sectional view orthogonal to the track, FIG. 3 (b) is a cross-sectional view taken along line AA of FIG. The same numbers as those in FIG. 1 indicate the same contents.
In this example, only H-steel 31 is used for the cross beam, and no sleepers are used, and the insulating material 32 is interposed between the flanges of the rail 3 and the H-shaped steel 31 and is fastened by the insulating fastening device 33 only. Unlike FIG. 1, the other configuration is the same as that in FIG. In this example, since no sleepers are used, the workability of the construction girders can be further improved. The reason why the H-shaped steel 31 and the rail are insulated is to prevent a short circuit between the rails through which the signal current flows.
[0010]
【The invention's effect】
As described above, according to the present invention, since it is manufactured using a shape steel and a high-strength bolt, it is not necessary to weld a steel plate, and the economic efficiency is improved compared to a construction girder manufactured by welding a conventional steel plate, The workability can be improved. Moreover, it has the same function as a conventional construction girder and can reliably receive a train load.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of a construction girder according to the present invention.
FIG. 2 is a view showing another example of a construction girder according to the present invention.
FIG. 3 is a diagram showing another example of a construction girder according to the present invention.
FIG. 4 is a diagram for explaining provisional reception of a track.
FIG. 5 is a diagram illustrating a construction girder.
[Explanation of symbols]
3 ... rails, 4 ... average sleepers, 10 ... main girders, 11, 21, 31 ... cross girders, 11a, 11b ... L-shaped steel, 12 ... driven high strength countersunk bolts, 13 ... bridge sleepers, 14 ... shelf boards, DESCRIPTION OF SYMBOLS 15 ... High strength bolt, 16 ... End stiffener, 21a ... Web, 21b ... Flange, 32 ... Insulating material, 33 ... Insulation fastening apparatus.

Claims (1)

  In a construction girder consisting of a main girder, a cross girder for inserting a sleeper, and a shelf board for mounting a girder attached to the main girder, the main girder is made of steel and the cross girder is composed of two L It is configured by forming a U-shaped cross section that overlaps the shape steel and inserting a sleeper and fastening it with high strength bolts, and the shelf board is configured by attaching L shape steel to the main girder belly plate with high strength bolts. Characteristic construction girder.

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