JP3791719B2 - Directly connected track construction method and track structure using construction girders - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction girder method and a railroad track structure, and more particularly to a direct connection track construction method and a track structure suitable for construction work of construction girder construction and removal, and maintenance-free track structure.
[0002]
[Prior art]
When constructing a structure under an existing railway track, there is a method of temporarily receiving the track with a construction girder. As this construction girder, a sleeper-embedding construction girder is generally used. The procedure of the construction method using this construction girder will be schematically described with reference to FIG.
FIG. 1 is a view showing a cross section of the roadbed 1. PC sleepers are usually used as sleepers, but PC sleepers are heavy as construction girders, and because of their weight, it is difficult to insert horizontal girders (sleeper support girders). Therefore, first, the PC sleepers are replaced with wooden sleepers 2 to support the rails 3, and further, the earth retaining piles 4 are driven by digging (FIG. 1A). Next, both sides of the road bed 1 are excavated for erection of the main girder (FIG. 1 (b)), the main girder 5 is erected or temporarily placed (FIG. 1 (c)), and then the cross girder 6 for holding the sleepers 2 is provided. Inserted and installed, the main girder 5 is moved laterally to support the horizontal girder 6, and the construction girder is completed.
[0003]
The construction girder will be removed after the construction (bypass, etc.) is completed directly under the track temporarily received by the construction girder. The construction girder is first removed by removing the main girder 5 and the horizontal girder 6, replacing the wooden sleepers 2 with PC sleepers, receiving the rails, putting in the ballast, and performing track maintenance.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional construction method using a sleeper-embedded construction girder, when the rail temporarily received by the construction girder is replaced with a new structure, the track structure must be a ballast track (a roadbed track). There was no actual situation.
[0005]
However, in recent years, the need to make the track structure maintenance-free has increased, so in order to meet this need, in the conventional construction method using a sleeper-embedded construction girder, the trajectory temporarily received by the construction girder is the ballast track. After the recovery, the work to change to a maintenance-free track structure had to be performed again. Also in this case, since the sleepers and ballasts are removed and the track of the main body structure is directly connected during night maintenance, the work range cannot be widened and a lot of work days are required. In addition, since the material for forming the direct connection track has to have a predetermined strength in a short time, the cost is expensive.
[0006]
The present invention is to solve the above-mentioned problems, and without changing the track temporarily received by the construction girder to the ballast track, the track is directly connected to the newly-constructed structure, thereby providing a maintenance-free track structure. The purpose is to reduce work and cost.
[0007]
[Means for Solving the Problems]
In the present invention, PC sleepers and synthetic sleepers are installed on a horizontal girder (sleeper support girder), and a rail is attached to assemble the main girder. When constructing a construction girder, the assembled construction girder is constructed by a carriage or the like. Move to the location, remove the rails and sleepers at the location where the construction girder is installed, excavate to the level of the main girder girder, install the construction girder collectively with a heavy vehicle, temporarily receive the track with the construction girder, The new structure is completed below, and when the track temporarily received by the construction girder is replaced with the new structure, the main girder of the construction girder and the end of the horizontal girder are removed, and sleepers and sleepers are on board. It is characterized in that the horizontal beam part is left as it is.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 2 is a diagram for explaining the construction method of the present invention.
2 (a) (longitudinal sectional view) and FIG. 2 (b) (transverse sectional view) are a group of construction girders in which a horizontal girder (sleeper receiving girder) 6 on which a PC sleeper 7 is previously installed and a main girder 5 are assembled. A state in which the concrete 8 is placed between the cross beam 6 and the floor board is shown. Prior to the construction of the construction girders, the rails and sleepers at the construction girders are removed and excavated to the main girder level, and the main girder is installed in the girder (not shown). When a PC sleeper (or synthetic sleeper or the like) 7 that can be used for a long time is installed on a steel cross beam 6, a cushioning material 9 such as a rubber mat is arranged on the lower surface of the sleeper so as to reduce the impact. In addition, resin injection or the like for preventing lateral displacement of the sleepers is performed, and bolts are fastened to the steel cross beams 6 as necessary.
[0009]
When a new structure is completed under the work girder and the track temporarily received by the work girder is replaced with the new structure, the work girder is removed. Remove only the part, and leave the cross-beam part on which the sleepers and sleepers are on as they are. When removing the main girder, the entire construction girder is supported by the main girder, so it is necessary to construct a structure that receives the track. Therefore, while the construction girder is supported by the main girder, a formwork is constructed between the main girder under the cross girder 6 (not shown), and the concrete girder 6 and sleepers 7 are rolled up on the concrete 8 The concrete 10 is casted into the new structure and integrated with the new structure. After curing the concrete, the bolts that fasten the cross beam 6 to the main girder 5 are removed to remove the main girder 5 (FIG. 2 (c)). (Vertical sectional view), FIG. 2 (d) (transverse sectional view)). In addition, it is desirable to arrange a cushioning material between the space between the horizontal beams and between the horizontal beams to prevent deterioration of the space due to repeated train loads. Also, when a lateral load is applied to the track due to a curved section, etc., only the main girder on one side is removed, and the formwork is constructed so that the end of the cross girder is rolled up, and concrete is placed, and after curing the other main girder Is removed, and the formwork is constructed so that the end of the cross beam is rolled up, and concrete is cast.
[0010]
Next, the protruding end of the cross beam 6 is cut (FIG. 2 (e) (longitudinal sectional view) and FIG. 2 (f) (cross sectional view). The horizontal direction is restrained, and at the same time, the cross beams and sleepers are made invisible.
[0011]
In the above, the end of the cross beam is cut, but it may be left as it is without being cut, and the filling concrete is placed simultaneously with the concrete finishing of the end of the cross beam. It may be.
[0012]
FIG. 3 is a diagram for explaining another embodiment of the present invention.
This example is also basically the same as the method shown in FIG. 2, except that the main girder is removed and integrated with the new structure.
First, a construction girder in which a cross beam 6 and a main girder 5 on which PC sleepers 7 are previously installed is assembled in a lump, and concrete 8 is placed between the cross beam 6 and the floor board. Next, as shown in FIGS. 3 (c) and 3 (d), before the main girder is removed, the temporary support member 20 is installed on the concrete 8 to temporarily receive the cross girder 6, and a sandbag 21 is placed between the cross beams. To prevent orbital movement, and then remove the main girder. Next, the protruding end of the cross beam 6 is cut (FIG. 3 (e), FIG. 3 (f)). It is integrated with the object, and concrete 11 is placed on the cross beams and sleeper ends to finish.
[0013]
【The invention's effect】
As described above, according to the present invention, when the construction girders are assembled in advance, temporarily installed to temporarily receive the track, and when the track is transferred to a new structure, the main girder and cross beam end portions of the work beam Only by removing the sleeper and the cross beam on which the sleeper is placed, it is integrated with the newly constructed structure, so that the track temporarily received by the work girder is not changed to a ballast track. It can be set as a structure, and it becomes possible to aim at night work and cost reduction.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a construction method using a sleeper-embedding construction girder.
FIG. 2 is a diagram illustrating an example of a construction method according to the present invention.
FIG. 3 is a diagram for explaining another example of the construction method of the present invention.
[Explanation of symbols]
3 ... rails, 5 ... main girders, 6 ... cross girders, 7 ... PC sleepers, 8 ... concrete, 9 ... cushioning material, 10 ... stuffed concrete, 11 ... concrete, 20 ... temporary support materials, 21 ... clay.

Claims (3)

A stage where PC sleepers or synthetic sleepers are installed on the horizontal girders, fixed to the main girders, and the construction girders are assembled before installation,
The stage to build the assembled construction girder at once,
Placing concrete between the cross beam and floor slab,
While undergoing orbital by construction of digits, the step of integrating by Da設between filling concrete on the concrete to involve crossbeam,
Removing the main girder,
After removing the main girder, the end of the cross beam is cut and the cut part is concrete finished,
Directly connected track construction method using construction girders including A stage where PC sleepers or synthetic sleepers are installed on the horizontal girders, fixed to the main girders, and the construction girders are assembled before installation,
The stage to build the assembled construction girder at once,
Placing concrete between the cross beam and floor slab,
While receiving the track by the construction girder, installing the temporary support material and receiving the cross beam with the concrete, fixing the cross beam between the cross beams and fixing the cross beam,
Removing the main girder,
After removing the main girder, the end of the cross beam is cut and the cut part is concrete finished,
Placing and integrating interstitial concrete between the interstitial cross beams,
Directly connected track construction method using construction girders including   A direct-connection track structure, which is installed by the method according to claim 1 or 2.

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