JP6823419B2 - Girder structure - Google Patents

Description

The present invention relates to a girder structure that supports a rail.

Conventionally, a construction girder that supports a railroad track has been used when excavating under a railroad track (see, for example, Patent Document 1).
In supporting the railing stile with the construction girder 5, as shown in FIG. 9, it is necessary to partially remove the ballast B.
The conventional construction girder 5 shown in FIG. 9 has a pair of H-shaped steels (main girders) 1 arranged along the extending direction of the rail R and a pair of H-shaped steels 1 facing each other. It is configured to include an L-shaped steel (shelf plate) 2 fixed to the web of the H-shaped steel 1 and a sleeper receiving girder (horizontal girder) 3 spanning the left and right L-shaped steels 2.

Japanese Unexamined Patent Publication No. 2001-214405

However, in the case of the construction girder 5 of Patent Document 1, since the sleeper receiving girder 3 has a structure of being laid horizontally on the L-shaped steel 2 at an intermediate position in the height direction of the H-shaped steel 1 (see FIG. 9), the sleepers It was necessary to remove extra ballast B for the space below the receiving girder 3, that is, the space corresponding to about half the height of the H-shaped steel 1, and the amount of ballast removed was large.
Then, if the amount of ballast removed is large, the time required for the removal work and transfer increases, and there is a problem that the construction period and the construction cost increase accordingly.

An object of the present invention is to make it possible to install a girder structure that supports a rail stile with a small amount of removing ballast.

In order to achieve the above object, the present invention
A girder structure including a pair of main girders arranged along the extending direction of the rail and a cross girder spanning the pair of main girders, and supporting the sleepers receiving the rail from below with the cross girder. And
The main girder includes a flange portion to which the horizontal girder is attached on the upper surface side thereof, a reinforcing ridge portion extending in the length direction of the main girder and fixed to the upper surface of the flange portion. With
The reinforcing ridge portion includes a web portion whose lower end is fixed to the upper surface of the flange portion, a sub-flange portion fixed to the upper end of the web portion so as to be substantially parallel to the flange portion, and a sub-flange portion. Is equipped with
The web portion is formed so that at least a part thereof is inclined in a direction away from the rail as it goes upward .

If the girder structure has such a configuration, the flange portion of the main girder is provided at the position of the L-shaped steel (shelf plate) provided on the web of the H-shaped steel of the conventional construction girder (see FIG. 9). Since the cross girder (sleeper receiving girder) attached to the flange supports the sleeper that receives the rail, the main girder and the main girder under the track can be removed with a smaller amount of ballast removal compared to the conventional construction girder. Cross girders can be installed.
In particular, the reinforcing ridge portion fixed on the upper surface of the flange portion is located at a position avoiding the building limit set on the rail so as to improve the bending strength of the flange portion. It can be suitably installed under the stile.

If the reinforcing ridge portion has a web portion and a sub-flange portion, the main girder is a member having a flange portion, a web portion, and a sub-flange portion and having a substantially H shape in cross section.
If the main girder is a member having a substantially H shape in cross section, its bending strength is strong, and the girder structure provided with this main girder can suitably support the rail stile.

If at least a part of the web portion has a shape inclined in a direction away from the rail, the upper end of the web portion is arranged at a position horizontally separated from the rail from the lower end, so that the sub-flange portion is placed on the rail. It becomes easy to separate from the rail in the horizontal direction, and it becomes easy to provide a reinforcing ridge portion at a position avoiding the building limit.

Also, preferably
The ends of the main girder are butted against each other so as to be continuous in the length direction thereof, and a seam plate straddling the flange portion is attached and joined at the butted portion.
Height adjusting means for aligning the height of the upper surface of the cross girder attached to the upper surface of the flange portion at a location without the seam plate and the upper surface height of the cross girder attached to the flange portion at a location where the seam plate is attached. Is provided on any of the cross girder, the seam plate, and the flange portion.
By the height adjusting means provided on any of the cross girder, the seam plate and the flange part, the cross girder attached to the upper surface of the flange part where there is no seam plate and the flange where the seam plate is attached. If the girder structure has the same upper surface height of the cross girder attached to the portion, a plurality of sleepers of the rail stile can be suitably supported by the cross girder, and the rail stile can be satisfactorily supported. ..

According to the present invention, the girder structure that supports the rail stile can be suitably installed with a smaller amount of ballast removed.

It is explanatory drawing which shows the girder structure of this embodiment. It is an enlarged explanatory view which shows the cross girder attached to the upper surface of the flange part of the main girder. It is explanatory drawing (a) which shows the overhanging part as a height adjusting means provided in the flange part in cross-sectional view, and explanatory drawing (b) which shows in a plan view. It is an explanatory view (a) which shows the notch as a height adjusting means provided in the seam plate in a cross-sectional view, and is an explanatory view (b) which shows in a plan view. It is explanatory drawing (a) which shows the notch as a height adjusting means provided in the cross girder in cross-sectional view, and explanatory drawing (b) which shows in plan view. An explanatory view (a) showing a cross-sectional view of a connecting portion of a main girder using an overhanging portion provided on a seam plate and an adjusting material placed on the overhanging portion as a height adjusting means, and a plane. It is explanatory drawing (b) which shows visually. It is explanatory drawing which shows the modification of the girder structure. It is explanatory drawing which shows the modification of the girder structure. It is explanatory drawing which shows the construction girder of the prior art.

Hereinafter, embodiments of the girder structure according to the present invention will be described in detail with reference to the drawings. However, although the embodiments described below are provided with various technically preferable limitations for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

FIG. 1 is an explanatory diagram showing a girder structure 100 of the present embodiment.
This girder structure 100 is used, for example, to support a track stile by removing a part of the ballast B and installing it when performing excavation work under a railroad track.

As shown in FIG. 1, the girder structure 100 of the present embodiment includes a pair of main girders 10 arranged along the extending direction of the rail R and a horizontal girder 20 spanning the pair of main girders 10. The sleepers M that receive the rail R are supported by the cross girder 20 from below.

The main girder 10 is fixed to the upper surface of the flange portion 10 extending in the length direction (material axis direction) of the flange portion 11 to which the horizontal girder 20 is attached on the upper surface side thereof and the flange portion 10. It is provided with a reinforcing ridge portion 12.
Since the reinforcing ridge portion 12 is fixed to the upper surface of the flange portion 11, the bending strength of the flange portion 11 in the length direction is improved.

The reinforcing ridge portion 12 has a web portion 12a whose lower end is fixed to the upper surface of the flange portion 11 and a sub-flange portion 12b fixed to the upper end of the web portion 12a so as to be substantially parallel to the flange portion 11. And have.
In particular, the web portion 12a of the reinforcing ridge portion 12 is formed so as to be inclined in a direction away from the rail R as it goes upward, so that the upper end of the web portion 12a is horizontally separated from the rail R from the lower end. By making it so, the reinforcing ridge portion 12 is provided at a position away from the rail R, avoiding the building limit G defined on the rail R.
The angle formed by the web portion 12a and the flange portion 11 is, for example, 45 ° or more and less than 90 °, and the sub-flange portions 12b of the paired main girders 10 are inclined in a direction in which they are separated from each other.

The main girder 10 provided with such a flange portion 11, a web portion 12a, and a sub-flange portion 12b has a flange portion 11 corresponding to the lower flange of the H-shaped steel and a sub-flange portion corresponding to the upper flange of the H-shaped steel. It can be said that the web connecting the 12b is a girder member formed in an inclined shape.
Then, the present inventors have substantially equivalent the main girder 10 of the present embodiment and the H-shaped steel having substantially the same size as the main girder 10 (for example, the H-shaped steel 1 of the construction girder 5 of the prior art). It was confirmed by FEM analysis that it had proof stress and rigidity.
The main girder 10 is made of the same metal material as general H-shaped steel.

The horizontal girders 20 spanning the pair of main girders 10 are attached in a direction substantially orthogonal to the main girders 10.
The cross girder 20 is a metal member that supports the plurality of sleepers M, and the plurality of cross girders 20 are attached to the main girder 10 in accordance with the distance between the sleepers M of the railroad tie.
As shown in FIG. 2, for example, the cross girder 20 is attached to the upper surface of the flange portion 11 by a fastener 30 such as a bolt or a nut.

As described above, the girder structure 100 of the present embodiment has a structure in which the sleepers M that receive the rail R are supported by the cross girder 20 attached to the upper surface of the flange portion 11 corresponding to the lower flange of the main girder 10. Therefore, the ballast B can be installed with a smaller amount of removal as compared with the conventional construction girder 5 (see FIG. 9).

In particular, the web portion 12a connecting the flange portion 11 and the sub-flange portion 12b has a shape inclined in a direction away from the rail R, so that the reinforcing ridge portion 12 of the main girder 10 is defined on the rail R. It is possible to install it at a position avoiding the building limit G.
The girder structure 100 provided with the main girder 10 having a proof stress and rigidity substantially equal to that of the conventional H-section steel has substantially the same strength as the construction girder 5 (see FIG. 9) of the prior art. The stile can be suitably supported.

Next, the connecting portion of the main girder 10 of the girder structure 100 of the present embodiment will be described.
The main girder 10 in the girder structure 100 is a plurality of main girders 10 joined together according to the installation range of the girder structure 100.
Specifically, the ends are abutted against each other so that a plurality of main girders 10 are connected in the length direction thereof, and a seam plate 40 straddling the flange portion 11 is attached at the abutted portion, and the main girders 10 are connected to each other. It is matched.

Here, since the plurality of cross girders 20 that support the plurality of sleepers M are attached to the flange portion 11 of the main girder 10 corresponding to the distance between the sleepers M of the railroad tie, the cross girders 20 in the girder structure 100 There are two types, one that is directly attached to the flange portion 11 and one that is attached to the flange portion 11 via the seam plate 40.
However, since the cross girder 20 of the girder structure 100 is a member for supporting the sleepers M of the railroad tie, if there is a difference in the mounting height for each cross girder 20, a problem will occur.
Therefore, in order to align the heights of the upper surfaces of the horizontal girder 20 attached to the upper surface of the flange portion 11 at the location where the seam plate 40 is not provided and the horizontal girder 20 attached to the flange portion 11 at the location where the seam plate 40 is attached, the following It was decided to use the height adjusting means described in 1.

For example, as shown in FIGS. 3A and 3B, a seam plate 40 is arranged so as to straddle the flange portion 11 at a position where the ends of the main girder 10 are butted against each other, and the seam plate 40 is formed by bolts or the like. It is fixed to the flange portion 11 by a fastener 30 such as a nut. Similarly, the seam plate 40 straddling the sub-flange portion 12b is also fixed to the sub-flange portion 12b by fasteners 30 such as bolts and nuts.
Seam plates 40 having different sizes are arranged on the upper surface and the lower surface of the flange portion 11, and are fixed by fasteners 30 so as to sandwich the flange portion 11 between the seam plates 40. Similarly, seam plates 40 having different sizes are arranged on the upper surface and the lower surface of the sub-flange portion 12b, and are fixed by fasteners 30 so as to sandwich the sub-flange portion 12b between the seam plates 40.

Then, for example, as shown in FIGS. 3A and 3B, an overhanging portion 11a is provided so that a part of the flange portion 11 of the main girder 10 projects in the horizontal direction in the vicinity of the end portion of the main girder 10. , The horizontal girder 20 placed on the upper surface of the overhanging portion 11a is fixed to the overhanging portion 11a by the fastener 30.
Since the overhanging portion 11a is integrally molded with the flange portion 11 so as to have the same thickness as the flange portion 11, the cross girder 20 attached to the upper surface of the overhanging portion 11a and the flange portion 11 The height of the upper surface of the horizontal girder 20 (see FIG. 2) attached to the upper surface can be made uniform.
That is, the overhanging portion 11a provided on the flange portion 11 functions as a height adjusting means.
In this way, the cross girder 20 attached to the upper surface of the flange portion 11 at the place where the seam plate 40 is not attached, and the horizontal girder attached to the overhanging portion 11a forming a part of the flange portion 11 at the place where the seam plate 40 is attached. Since the heights of the upper surfaces of the 20 can be made uniform, the girder structure 100 can suitably support a plurality of sleepers M of the stile.
The position where the overhanging portion 11a is provided on the flange portion 11 can be set in advance according to the mounting position of the cross girder 20 corresponding to the distance between the sleepers M of the railroad tie.

Further, for example, as shown in FIGS. 4A and 4B, a notch 40a having a substantially "U" shape in a plan view is formed in the seam plate 40, and a cross girder is formed in the notch 40a provided in the seam plate 40. The cross girder 20 may be mounted on the flange portion 11 by fitting the end portion of the 20 and the mounted cross girder 20 may be fixed to the flange portion 11 by the fastener 30.
By doing so, the cross girder 20 can be attached to the upper surface of the flange portion 11 even at the location where the seam plate 40 is attached. Therefore, the cross girder 20 can be attached to the upper surface of the flange portion 11 at a location where the seam plate 40 is not attached. The height of the upper surface of the horizontal girder 20 attached to the flange portion 11 can be made uniform at the location where the seam plate 40 is attached.
That is, the notch 40a provided in the seam plate 40 functions as a height adjusting means.
Even with such a girder structure 100, a plurality of sleepers M of the rail stile can be suitably supported.
The position where the notch 40a is provided in the seam plate 40 can be set in advance according to the mounting position of the cross girder 20 corresponding to the distance between the sleepers M of the railroad tie.

Further, for example, as shown in FIGS. 5A and 5B, a side view substantially “L” -shaped notch 20a corresponding to the thickness of the seam plate 40 is formed on the lower surface side of the end portion of the cross girder 20. The cross girder 20 is placed on the flange portion 11 via the seam plate 40 so that the notch 20a portion is placed on the seam plate 40, and the placed cross girder 20 is placed on the flange portion 11 by the fastener 30. It may be fixed.
Since the notch 20a formed on the lower surface of the end portion of the cross girder 20 has a size corresponding to the thickness of the seam plate 40, the cross girder 20 placed on the flange portion 11 via the seam plate 40 and the seam. The height of the upper surface of the cross girder 20 attached to the upper surface of the flange portion 11 can be made uniform at a place where the plate 40 is not provided.
That is, the notch 20a provided in the cross girder 20 functions as a height adjusting means.
Even with such a girder structure 100, a plurality of sleepers M of the rail stile can be suitably supported.

Further, for example, as shown in FIGS. 6A and 6B, a seam plate 40 attached to the lower surface side of the flange portion 11 is formed with an overhanging portion 40b in which a part thereof projects in the horizontal direction, and the seam thereof. An adjusting material 50 having the same thickness as the flange portion 11 is attached to the upper surface of the overhanging portion 40b of the plate 40.
Then, the cross girder 20 is placed on the adjusting material 50 overlapped with the overhanging portion 40b of the seam plate 40, the placed cross girder 20 is fixed to the seam plate 40 by the fastener 30, and the seam plate 40 is fixed. The cross girder 20 may be fixed to the flange portion 11 via the cross girder 20.
Since the adjusting material 50 has the same thickness as the flange portion 11, the cross girder 20 attached to the upper surface of the adjusting material 50 overlapped with the overhanging portion 40b of the seam plate 40 and the upper surface of the flange portion 11 The height of the upper surface of the attached cross girder 20 can be made uniform.
That is, the adjusting material 50 and the overhanging portion 40b of the seam plate 40 function as height adjusting means.
Even with such a girder structure 100, a plurality of sleepers M of the rail stile can be suitably supported.

As described above, the girder structure 100 of the present embodiment, which can be installed with a smaller amount of ballast B removed than before, can suitably support the sleepers M with a plurality of cross girders 20 having the same top height. The railroad ties can be suitably supported.

The present invention is not limited to the above embodiment.
For example, as shown in FIG. 7, the main girder 10 of the girder structure 100 of the present embodiment may be formed so that a part of the web portion 12a is inclined in a direction away from the rail R as it goes upward. ..
If at least a part of the web portion 12a has a shape inclined in a direction away from the rail R, the upper end of the web portion 12a may be located at a position horizontally separated from the rail R than the lower end. It is possible to provide the reinforcing ridge portion 12 of the main girder 10 at a position on the rail R avoiding the building limit G, and to install the main girder 10 at a position avoiding the building limit G.

Further, as shown in FIG. 8, the lower end of the web portion 12a is fixed at a position separated from the rail R on the upper surface of the flange portion 11, and the upper end of the web portion 12a is closer to the rail R on the lower surface of the sub-flange portion 12b. A girder structure 100 having a main girder 10 fixed at a location may be used.
Even with such a girder structure 100, the main girder 10 can be installed at a position avoiding the building limit G defined on the rail R.

It should be noted that the girder structure 100 of the above embodiment can be used as a construction girder when performing excavation work under the railroad track, and the girder structure 100 can be used as a main structure for supporting the railroad track. Can also be used.

Further, in the above embodiment, the reinforcing ridge portion 12 is composed of the web portion 12a and the sub-flange portion 12b, but the present invention is not limited to this, and the reinforcing ridge portion 12 is not limited thereto. The portion 12 may be a main girder 10 having a substantially inverted T-shape in cross-sectional view, which is composed of only the web portion 12a.
Further, the sub-flange portion 12b of the reinforcing ridge portion 12 is not limited to being parallel to the flange portion 11, and its angle and shape are arbitrary as long as it is located at a position avoiding the building limit G.

Further, the number and arrangement of the fasteners 30 used for arranging the seam plate 40 are arbitrary, and are not limited to the illustrated examples.

In addition, it goes without saying that the specific detailed structure and the like can be changed as appropriate.

10 Main girder 11 Flange part 11a Overhang part (height adjustment means)
12 Reinforcing ridge part 12a Web part 12b Sub-flange part 20 Cross girder 20a Notch (height adjustment means)
30 Fastener 40 Seam plate 40a Notch (height adjustment means)
40b Overhang (height adjustment means)
50 Adjusting material (height adjusting means)
100-digit structure R rail M sleepers B ballast G building limit

Claims (2)

A girder structure including a pair of main girders arranged along the extending direction of the rail and a cross girder spanning the pair of main girders, and supporting the sleepers receiving the rail from below with the cross girder. And
The main girder includes a flange portion to which the horizontal girder is attached on the upper surface side thereof, a reinforcing ridge portion extending in the length direction of the main girder and fixed to the upper surface of the flange portion. With
The reinforcing ridge portion includes a web portion whose lower end is fixed to the upper surface of the flange portion, a sub-flange portion fixed to the upper end of the web portion so as to be substantially parallel to the flange portion, and a sub-flange portion. Is equipped with
The girder structure is characterized in that the web portion is formed so that at least a part thereof is inclined in a direction away from the rail as it goes upward . The ends of the main girder are butted against each other so as to be continuous in the length direction thereof, and a seam plate straddling the flange portion is attached and joined at the butted portion.
Height adjusting means for aligning the height of the upper surface of the cross girder attached to the upper surface of the flange portion at a portion without the seam plate and the upper surface height of the cross girder attached to the flange portion at a portion where the seam plate is attached. The girder structure according to claim 1 , wherein the girder structure is provided on any of the cross girder, the seam plate, and the flange portion.

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