JP3746479B2 - Railway construction girder and its installation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a railroad girder used when a crossing structure under a track is constructed by an open-cut method without making the track a broken line.
[0002]
[Prior art]
There is a sleeper-embedding construction girder in the prior art of a construction girder method that can be constructed without a broken line. (For example, refer to Patent Document 1).
[0003]
This construction girder uses I-type steel as the main girder, U-shaped steel with inscribed wooden sleepers as horizontal girder and arranged in the sleeper spacing, and this girder is placed on the main girder flange. It is a middle road girder that is fixed by bolting.
[0004]
In this construction girder construction method, first, a road bed retaining ring is constructed at the end of an existing PC sleeper and a main girder is arranged. Next, the PC sleeper is removed, and a holding-type horizontal girder used for the construction girder is inserted in place of the PC sleeper and fastened to the main girder. The construction girder will be removed after the construction of the under-orbit structure is completed, but the final restoration will be completed by exchanging it with a PC sleeper after constructing the trajectory with a wooden sleeper-embedded horizontal girder.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-8304
[Problems to be solved by the invention]
However, in the conventional sleeper embedding construction girders, the construction of the girders requires a construction period of at least 5 nights. Also, track maintenance work is required at the end of the construction, and the train is slowed down when the train is operating while the girder is erected. Furthermore, when the track is restored after construction of the under-track crossing structure is completed, it is necessary to replace the PC sleepers at the same time as night girder removal work. The main cross section of the steel used for the cross beam becomes larger. These increased the construction girder construction period and increased the construction cost.
[0007]
An object of the present invention is to provide a construction girder and a construction method thereof that solve the above-mentioned problems, shorten the construction period, and reduce the construction cost.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a construction girder according to the present invention is a railway girder construction girder in which rails are laid on a PC sleeper. An end suspension member that suspends the end suspension member, a central stringer that is disposed along the rail and that suspends the central suspension member, an end stringer that is disposed along the rail and suspends the end suspension member, and A transverse girder arranged to cross the rail, supporting the central stringer and the end stringer, and a main girder supporting both ends of the transverse string,
Is provided.
[0009]
Further, the construction method of the construction girder according to the present invention is a method for constructing a construction girder for a railroad rail in which a rail is laid on a PC sleeper, and a step of cutting the bottom part of the PC sleeper and attaching a central suspension base. Cutting the bottom of the PC sleeper end to attach the end suspension base, and placing a central stringer between the central suspension base and the central suspension lid on the top of the central suspension base Fixing the PC sleeper and the central stringer in a central suspension member, disposing an end stringer in the end suspension member, and attaching an end suspension cover portion to an end suspension base portion. Attaching to the upper part, fixing the PC sleeper and the end stringer to the end suspension material, installing and fixing a horizontal beam under the central stringer and the end stringer, and installing the main beam And fixing the horizontal beam on the main beam.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A construction girder structure according to the present invention will be described with reference to FIGS.
[0011]
This construction girder hangs the central suspension 1 that suspends and holds the central part of the PC sleeper 8, the central vertical girder 2 that extends in the direction of the rail 5 and supports the central suspension 1, and the end of the PC sleeper 8. The end suspension member 3 to be held, the end stringer 4 extending in the direction of the rail 5 to support the end suspension member 3, and the central stringer 2 and the end stringer 4 are arranged substantially parallel to the PC sleeper 8. It comprises a main beam 7 that is arranged substantially parallel to the horizontal beam 6 and the rail 5 and supports the horizontal beam 6.
[0012]
The main girder 7 is made of a steel material on which a gantry 11 is provided, and is installed in parallel to the rail 5 on both sides of the under-track structure excavation part. A cross beam 6 made of steel is passed between the main beam 7 and the main beam 7 and supported on a frame 11 of the main beam 7. In this embodiment, one cross beam 6 is installed at intervals of four PC sleepers 8, but the cross beams 6 may be installed at other intervals.
[0013]
The cross beam 6 supports a central stringer 2 and an end stringer 4 extending substantially parallel to the rail 5 thereon. The central stringer 2 is made of steel, and has a wing part 2B protruding from the central stringer 2 in a substantially right angle direction. Both end portions of the wing portion 2B are fixed to the central suspension member 1 that suspends the central portion of the PC sleeper 8. The end stringer 4 has an overhanging part 4 </ b> B protruding from the end stringer 4 in a substantially right angle direction. Both ends of the overhanging portion 4B are fixed to the end suspension member 3 that suspends the end portion of the PC sleeper 8.
[0014]
Two central suspension members 1 are installed so as to be symmetrical with respect to the center of the PC sleeper 8. As shown in FIG. 3, the central suspension member 1 includes a central suspension member base portion 1 </ b> A having a U shape in a cross section and a central suspension member lid portion 1 </ b> B having a torii shape. The central suspension member base 1A is configured to be divided. When the central suspension member 1 is installed in the PC sleeper 8, the central suspension member base 1A is sandwiched from the front and rear of the PC sleeper 8, and the PC sleeper 8 is placed in the central suspension member base 1A. To house. The central suspension member base portion 1A and the central suspension member lid portion 1B are fastened with bolts so as to sandwich the end portions of the PC sleeper 8 and the wing portion 2B from above and below.
[0015]
As shown in FIG. 4, the end suspension member 3 installed at the end portion of the PC sleeper 8 includes an end suspension member base portion 3 </ b> A and an end suspension member lid portion 3 </ b> B that are U-shaped in cross section. The end suspension member base 3A is provided with a contact member 10 for preventing the PC sleeper 8 from shifting in the longitudinal direction. The end suspension member base 3 </ b> A and the end suspension member lid 3 </ b> B are fastened with bolts so as to sandwich the PC sleeper 8 and the overhanging portion 4 </ b> B of the end stringer 4.
[0016]
By adopting such a structure, not only the end portion of the PC sleeper 8 but also the central portion of the PC sleeper 8 can be suspended, and the deflection of the PC sleeper 8 is prevented. Moreover, even if the bottom of the PC sleeper 8 is cut, the PC sleeper 8 can be supported with sufficient strength.
[0017]
Next, the construction method of the construction girder will be described with reference to FIGS. In each figure, (a) is a cross-sectional view and (b) is a side view.
[0018]
FIG. 5 shows the PC sleeper 8 and the rail 5 before the construction of the construction girder.
[0019]
First, as shown in FIG. 6, the lower part of the PC sleeper 8 where the central suspension member base 1 </ b> A is installed is cut out, and the divided central suspension member base 1 </ b> A is attached so as to be sandwiched from the front and rear of the PC sleeper 8. Then, the divided central suspension base 1A is fastened with a bolt to be integrated.
[0020]
Next, as shown in FIG. 7, the bottom of the end portion of the PC sleeper 8 is cut, and the end suspension member base 3A is inserted into the cut portion. In order to confirm that the PC sleeper 8 is sufficiently held in the end suspension base 3 </ b> A, the end suspension base 3 </ b> A is inserted until the PC sleeper 8 contacts the contact material 10.
[0021]
Next, as shown in FIG. 8, the central string 2 is arranged between the two central suspension bases 1A, and the PC sleepers 8 and the wings 2B of the central string 2 are fixed in the central suspension base 1A. Thus, each central suspension member lid 1B is fastened to the central suspension member base 1A with bolts.
[0022]
Next, as shown in FIG. 9, the end stringer 4 is disposed in the end suspension member base 3A, and the end suspension member cover material 3B is covered and fastened with bolts from above.
[0023]
Next, as shown in FIG. 10, the cross beam 6 is installed below the central stringer 2 and the end stringer 4 and fastened with bolts.
[0024]
Next, as shown in FIG. 11, the main beam 7 is installed at both ends of the horizontal beam 6, and the horizontal beam 6 is placed on the frame 11 of the main beam 7 and fastened with bolts.
[0025]
FIG. 12 is a diagram showing a place where the construction work for the construction girder is completed.
[0026]
Although the present invention has been described in certain terms with regard to structural and methodological features, the means disclosed herein include preferred forms of practicing the invention, and the invention is illustrated and described. It is not limited to specific features. Accordingly, the present invention includes any forms or modifications within the scope of the claims as appropriately interpreted in accordance with the principle of equality.
[0027]
【The invention's effect】
The effects of this construction girder are listed below.
[0028]
This construction girder can support PC sleepers with sufficient strength, and trains can be operated at low speed even while the construction girder is installed.
[0029]
The road bed earth retaining work and the replacement work of the existing PC sleeper and the horizontal girder, which were necessary when laying the PC sleeper embedding work girder according to the prior art, become unnecessary.
[0030]
It will not be necessary to replace PC sleepers when the work girder is removed after the work is completed.
[0031]
It is easy to divide the work, and the work can be performed even for a short time.
[0032]
The main girder is not necessary for small-scale construction such as excavating 2 to 3 PC sleepers under the track, and the vehicle can be driven at low speed with simple construction.
[0033]
Therefore, the work accompanying the construction girder construction / removal is reduced, and the construction girder can be constructed even under severe conditions of line closing time.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a construction beam structure according to the present invention as viewed from a rail direction.
FIG. 2 is a schematic configuration diagram of a construction girder structure according to the present invention as viewed from the sleeper direction.
FIG. 3 is a cross-sectional view taken along AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG.
FIG. 5 is an explanatory diagram of a construction girder construction method according to the present invention.
FIG. 6 is an explanatory diagram of a construction girder construction method according to the present invention.
FIG. 7 is an explanatory diagram of a construction beam erection method according to the present invention.
FIG. 8 is an explanatory diagram of a construction girder construction method according to the present invention.
FIG. 9 is an explanatory view of a construction beam erection method according to the present invention.
FIG. 10 is an explanatory diagram of a construction beam erection method according to the present invention.
FIG. 11 is an explanatory diagram of a construction beam erection method according to the present invention.
FIG. 12 is an explanatory diagram of a construction girder construction method according to the present invention.
[Explanation of symbols]
1 Central Suspension Material 1A Central Suspension Material Base 1B Central Suspension Material Lid 2 Central Vertical Girder 2B Wing 3 End Suspension Material 3A End Suspension Material Base 3B End Suspension Material Lid 4 End Vertical Material 4B Overhang 5 Rail 6 Horizontal girder 7 Main girder 8 PC sleeper 10 Ding material 11 Mounting base

Claims (2)

In the construction girder of railroad rails where rails are laid on PC sleepers,
A central suspension for hanging the central portion of the PC sleeper;
An end suspension that suspends both ends of the PC sleeper;
A central stringer arranged along the rail and suspending the central suspension material,
An end stringer that is disposed along the rail and suspends the end suspension;
A cross beam arranged to cross the rail and supporting the central stringer and the end stringer;
A main girder that supports both ends of the cross beam;
Railway construction girder characterized by comprising. In the construction method of the construction girder of railroad rails where rails are laid on PC sleepers,
Cutting under the PC sleeper center and attaching a central suspension base;
Cutting under the PC sleeper end to attach the end suspension base,
Placing a central stringer between the central suspension bases, attaching a central suspension cover to the top of the central suspension base, and fixing the PC sleeper and the central stringer in the central suspension;
A step of disposing an end stringer in the end hanging member, attaching an end hanging member lid to an upper portion of the end hanging member base, and fixing the PC sleeper and the end stringer to the end hanging member. When,
Install and fix a transverse beam under the central stringer and the end stringer,
Installing a main girder and placing and fixing the horizontal girder on the main girder;
The construction method of the railway construction girder characterized by having.

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