JP4072826B2 - Rail suspension girder and its erection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a railway work girder that supports a track and a method of erection thereof when performing construction such as excavation under the track, such as construction of a structure under a track.
[0002]
[Prior art]
When constructing the structure under the track under the track while running the train, the railway construction girder that firmly supports the track even if the underside of the track becomes hollow due to excavation and allows the train to travel safely in the section Is used. This construction girder has two main girders arranged on both sides of the track, U steel cross beams placed under the sleepers of the existing track, and a support beam that supports the sleepers at the bottom of the recesses of the cross beams. Consists of fixed connection. Generally, a PC sleeper is used as the track sleeper. However, the weight of the track sleeper is heavy, and it is difficult to insert a horizontal girder (sleeper receiving girder). Therefore, it is usual to replace the PC sleeper with a wooden sleeper.
[0003]
This construction girder has a structure in which the main girder and the receiving girder are each manufactured by welding steel plates, and there is a problem that manufacturing accuracy varies due to welding distortion and manufacturing cost becomes expensive. In order to solve these problems, there is a method that eliminates the need for welding by using shaped steel for the main girder and the receiving girder, thereby reducing the cost. (For example, refer to Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2001-214405 gazette
[Problems to be solved by the invention]
However, in this construction method, a groove-like recess for storing the main girder is excavated to the side of the track and formed together with the earth retaining work, and the main girder is arranged and fixed on a work girder cradle prepared in advance. . Next, the ballast crushed stone at the bottom and side of the sleeper is removed, and a steel receiving girder is inserted below the sleeper to support the track and to be fixedly connected to the main girder. However, the work within the limited train interval is extremely complicated and the construction of the construction girder takes a long time. was there.
[0006]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a construction girder that can shorten the erection period and thus reduce the construction cost, and a erection method therefor.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the railway construction girder according to the present invention is arranged so as to cross the rail under the left and right rails in the railway construction girder that supports the track when excavating under the track. A receiving girder for supporting each of the rails, a pair of vertical beams arranged on both sides of the rails along the rails for supporting the receiving girder, and the vertical beams under the vertical girder And a transverse girder that crosses the left and right rails to support the stringer and a pair of main girders that are arranged on both sides of the track and that support both ends of the stringer.
[0008]
Further, the construction method of the railway construction girder according to the present invention is a method of constructing the railway construction girder that supports the track when the undercut of the track is opened. And a step of excavating under the rail between the sleepers across the track with a predetermined interval, installing a cross beam, and placing the vertical beam along the rail on both sides of the rail, the vertical beam A step of fastening and fixing to the receiving beam and the cross beam, a step of arranging a main beam along the track on both sides of the track, and a step of connecting and fixing the cross beam on the main beam.
[0009]
【The invention's effect】
According to the first invention, since the girder is set to be short so as to support the left and right rails, the removal range of the ballast crushed stone may be short, and the weight is light so that it is very short. You can finish the work. Moreover, in the small-scale construction which excavates under the track of about 2 to 3 sleepers, the main beam becomes unnecessary because the vertical beam supports the track. Furthermore, since existing sleepers can be left as they are, it is easy to recover after completion of under-orbit excavation work.
[0010]
According to the second invention, it is only necessary to arrange the cross beams between every few sleepers, so that it is not necessary to cut all the sleepers across the left and right rails, and the work can be shortened.
[0011]
According to the third aspect of the invention, the roadbed earth retaining work associated with the installation of the main girder is unnecessary, which contributes to shortening the construction period and reducing the construction cost. In this case, it is preferable that the receiving girder and the horizontal girder are installed at an arbitrary place in the construction girder erection range according to the space between trains. Can be made more efficient.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1, the structure of a railway construction girder according to the present invention will be described.
[0013]
This construction girder is arranged below the rail 1 and between the PC sleepers 8 and 8 so as to intersect the rail 1, and along the rail 1, A vertical girder 5 that is fixed to the upper part and suspends and supports the receiving girder 3, and is arranged under the rail 1 and between the PC sleeper 8 and the PC sleeper 8 along the PC sleeper 8. The cross beam 2 is supported, and the main beam 4 is arranged outside the rail 1 along the rail 1 and supports the cross beam 2.
[0014]
The main girder 4 made of steel has a gantry 11 and is installed along the track on both sides of the structure under the track. Between the main girders 4 on both sides, a cross beam 2 made of steel is passed and supported on the gantry 11 of both main girders 4. In this embodiment, one cross beam 2 is installed at intervals of four of the PC sleepers 8, but the cross beams 2 may be installed at other intervals.
[0015]
Each cross beam 2 supports two sets of vertical beams 5 including two rails 1 and a pair of vertical beams 5 extending so as to be sandwiched along each rail 1. The vertical girder 5 is made of steel and is fixed to the horizontal girder 2 with fastening bolts 6 via an insulating material 7. Similarly, the rail 1 is also fixed to the cross beam 2 by the fixing tool 9 through the insulating material 10.
[0016]
Between the PC sleepers 8 where the horizontal beam 2 is not arranged, the short receiving beam 3 is arranged under each rail 1 and so as to intersect with the rail 1. The receiving girder 3 is made of a steel material having a width necessary for fixing one rail 1 and two stringers 5, and the stringers 5 are arranged so that the upper surfaces of both ends abut each stringer 5. It is fixed by the fastening bolt 6. The receiving girder 3 is fixed to the rail 1 by a fixing tool 9 through an insulating material 10.
[0017]
With this configuration, the main beam 4 supports the horizontal beam 2, and the horizontal beam 2 supports the receiving beam 3 disposed below each rail 1 via each pair of vertical beams 5 disposed on both sides of each rail 1. The left and right receiving girders 3 support the left and right rails 1 from below. Thereby, the deflection of the rail 1 is prevented and the rail 1 is supported with sufficient strength. Therefore, without a line fracture trajectories can be digging the track under.
[0018]
Next, the construction method of the construction girder will be described with reference to FIGS. Each figure shows a cross-sectional view and a side view.
[0019]
(1) shows PC sleepers 8 and rails 1 before the construction of the girder.
[0020]
First, as shown in (2), under the track where the cross beam 2 is to be placed, the lower beam of the left and right rails 1 is cut open, the cross beam 2 is installed in the cut portion, and the cross beam 2 and the rail 1 are connected. Fix with the fixture 9.
[0021]
Next, as shown in (3), the lower part of each rail 1 where the receiving girder 3 is arranged is partially excavated, and a pair of receiving girders 3 are inserted into the excavated part from both sides of the track, respectively. The girder 3 and the rail 1 are fixed with a fixing tool 9. Since the girder 3 is short, it is not necessary to cut across between the left and right rails 1, and construction can be performed while leaving the ballast crushed stone between the left and right rails 1. In this embodiment, after the stringer 5 outside the rail is fastened and fixed to the beam 3, the beam 3 is installed in the cut-out portion below the rail 1. Good.
[0022]
Next, as shown in (4), the vertical girder 5 on the inner side of the rail is disposed along the rail 1, and this is fastened and fixed to the receiving girder 3. That is, the short receiving beam 3 is suspended and supported by two vertical beams 5 parallel to the rail 1.
[0023]
Finally, as shown in (5), the main girder 4 is installed on both sides of the track, and the horizontal girder 2 is placed on the frame 11 of the main girder 4 and fixed.
[0024]
If the track is supported by the main girder 4 in this way, the train travels without any trouble, so excavation work under the track can be performed freely regardless of the train travel.
[0025]
The effects of this construction girder are listed below.
[0026]
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.
[0027]
It is not necessary to carry out the earth retaining work and the installation work of the existing PC sleepers and horizontal girders, which was necessary when laying the PC sleeper embedding girders of the prior art. And contributes to the reduction of construction costs.
[0028]
When the installation of the receiving girder 3 and the horizontal girder 2 is performed at an arbitrary position in the construction girder erection range according to the space between trains, the limited space between trains can be used effectively, and work efficiency can be improved.
[0029]
It is easy to divide the work, and the work can be performed even for a short time.
[0030]
Installation of the girder 3 is short so that the girder 3 can support the left and right rails 1, so the removal range of the ballast crushed stone may be short and the weight is light, so the work can be completed within a very short time. it can.
[0031]
In the small-scale construction work for the excavation under the orbit of two or three about sleepers, because the girders 5 to support the orbit main girder 4 is not required, it is possible to simple facilities Engineering.
[0032]
Since existing sleepers can be kept as they are, it is easy to recover after completion of under-orbit excavation work.
[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.
[0034]
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.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a railway construction girder according to the present invention. A is a cross-sectional view of the work girder as viewed from the track direction, B is a cross-sectional view of the work girder as viewed from above, and C is a cross-sectional view of the work girder as viewed from the lateral direction.
FIG. 2 is a diagram for explaining a construction girder construction method according to the present invention.
FIG. 3 is a diagram for explaining a construction girder construction method according to the present invention.
FIG. 4 is a diagram for explaining a construction beam erection method according to the present invention.
[Explanation of symbols]
1 rail 2 horizontal girder 3 receiving girder 4 main girder 5 vertical girder 8 sleepers

Claims (3)

In the railway girder that supports the track when excavating under the track,
Receiving girders that are respectively arranged to cross the rails under the left and right rails and support the rails;
A pair of vertical beams arranged on both sides of the rails along the rails and supporting the receiving beams;
A transverse beam arranged across the left and right rails so as to cross the longitudinal beam under the longitudinal beam, and supporting the longitudinal beam,
A pair of main beams arranged on both sides of the track and supporting both ends of the cross beam;
Railway construction girder characterized by comprising. 2. The railway construction girder according to claim 1, wherein the receiving girder is disposed between sleepers that support the left and right rails, and the horizontal girder is disposed between a plurality of sleepers. In the method of constructing a railroad work girder that supports the track when excavating under the track,
Excavating under the rails between the sleepers and installing a receiving girder;
A step of cutting under the rail between the sleepers across the track with a predetermined interval, and installing a cross beam;
Arranging a stringer along the rail on both sides of the rail, and fastening the stringer to the receiving beam and the cross beam;
Placing main girders along the track on both sides of the track;
Mounting and fixing the horizontal beam on the main beam;
A construction method of a railway construction girder characterized by comprising:

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