JPH07252802A - Sleepers for long rails - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the roadbed lateral resistance of a hollow box-shaped sleeper that can be filled with ballast inside by opening the bottom so that it can be applied to sleepers for long rails. [Structure] A plurality of spike-shaped projections 22 are provided on the lower edges of both side plates 18 of a hollow box-shaped sleeper body 10 having an open bottom so that ballast can be filled therein, and the spike-shaped body 22 is provided with the same. A resistance plate 23 in the form of a flat plate is provided at the lower edge of both end face plates 19 of the device 10 so as to project downward over at least the entire length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeper for long rails, and more particularly to a sleeper for long rails having a hollow box shape with an open bottom.

[0002]

2. Description of the Related Art Conventionally, in a railroad track, a ballast such as gravel or crushed stone is formed on a roadbed, sleepers are buried in the roadbed, and a pair of rails are laid on the railroad track. The sleepers are generally made of wood or concrete. These conventional sleepers are formed to have a certain thickness or more in order to secure their strength.

In railway lines, it is difficult to secure the thickness of the roadbed. For example, when installing overhead lines to electrify an existing unelectrified tunnel, or when vehicles passing through this tunnel grow in size, avoid re-digging the tunnel, or To minimize this, it is common practice to reduce the thickness of the bed.

However, in the railroad track, it is necessary to secure a ballast layer having a constant thickness under the sleepers.
In addition, the sleepers themselves need to have a certain thickness or more because of the demand for strength and lateral resistance. Therefore, there is a problem that the conventional structure cannot simply reduce the thickness of the track bed.

Therefore, in order to reduce the thickness of the bed and to secure the strength and lateral resistance of the sleeper main body, a hollow box-shaped metal sleeper which has an opening at the bottom and can be filled with ballast has been previously proposed. ing. According to this configuration, by filling the interior of the hollow box shape with an open bottom with ballast, a ballast layer is formed inside the sleeper body as well, and by the substantial thickness of this sleeper body, the ballast of the roadbed is reduced. The thickness can be reduced, and the required lateral resistance can be secured despite the substantial thickness of the sleeper body being reduced.

[0006]

On the other hand, JR companies and major private railways are becoming longer rails in the straight section of the main line (including the curved section of R800 m or more). Therefore, it is necessary to further secure the roadbed lateral resistance of sleepers for long rails in order to prevent the rails from overhanging in the summer.

The present invention solves the above problems, and an object of the present invention is to provide a sleeper for long rails capable of ensuring sufficient lateral roadbed resistance.

[0008]

In order to solve the above-mentioned problems, a sleeper for a long rail according to the present invention has a hollow box-shaped sleeper body which is open at the bottom and can be filled with ballast. A plurality of spike-like projections projecting downward are provided at the edges, and further flat plates and resistance plates projecting downward over at least the entire length are provided at the lower edges of both end surface plates of the sleeper body.

[0009]

With the above structure, a plurality of spike-like projections projecting downward from the lower edges of both side plates of the sleeper body are engaged with the ballast, and further flat plate-like projections are formed at the lower edges of both end face plates of the sleeper body at least over the entire length. Resistance plate meshes with the ballast. Therefore, lateral resistance equivalent to the number of protrusions is obtained below both side plates of the sleeper body, and stronger lateral resistance force is obtained along the rail length direction of the end plates below both end plates of the sleeper body. A strong lateral bed resistance that can be applied to sleepers will be obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 10 denotes a sleeper body, which is formed in a hollow box-like shape with an open bottom and is made of a metal material such as ductile cast iron. The sleeper main body 10 can support the pair of rails 12 by the rail support portions 11 formed near both ends thereof, and the hole portions of the pair of shoulder portions 13 formed in the rail support portions 11 respectively. Each rail 12 can be fastened by a pan roll clip 15 attached to the rail 14. An insulating pad 16 is interposed between the rail 12 and the rail support 11.

The box-shaped sleeper main body 10 has an upper plate 17, side plates 18 and end plates 19 that are swirled around the upper plate 17, and the width of the sleeper main body 10 is defined by the upper plate 17, and the side plates 18 and Sleeper body 1 by end plate 19
A height or thickness of 0 is defined. In addition, thick-walled portions 20 for reinforcement are formed at the hem edges of the side plate 18 and the end plate 19. Further, the central portion 21 of the sleeper body 10 between the pair of rail support portions 11 is formed to be narrower than the rail support portions 11.

Further, a plurality of spike-like projections 22 for generating lateral resistance are formed on the lower edge of the side plate 18 at the peripheral portion so as to project downward so that they can be engaged with the ballast. Also on the lower edge of the end plate 19, the upper plate 1
The side plate 1 has a width W in the rail length direction longer than the width w of the side plate 1.
8 and projecting forward and backward in the rail length direction and protruding 22
A flat resistance plate 23 having a height H higher than the height h and capable of meshingly engaging with the ballast is formed so as to project downward.

[0013] In this sleeper, a ballast layer is formed inside the sleeper body by filling the hollow box-shaped sleeper body with ballast, and the substantial thickness of the sleeper body is reduced. Nevertheless, the required lateral resistance can be secured. And, even when it is used in a long rail section, a plurality of spike-shaped projections 2 provided so as to project downward at the lower edge of the peripheral portion of the sleeper body 10.
2 and the flat resistance plate 23 can secure a larger lateral resistance force, and achieve a predetermined reference value set as the roadbed lateral resistance force of the sleeper for long rails to prevent the rail from overhanging. You can Here, the number and height of the spike-shaped projections 22 and the length and height of the resistance plate 23 are set according to the required lateral roadbed resistance value.

[0014]

As described above, according to the present invention, a plurality of spike-like projections provided so as to project downward from the lower edges of both side plates of the sleeper body, and the lower edges of both end surface plates of the sleeper body. Since the flat resistance plate provided so as to project downward over at least the entire length engages with the ballast, the lateral resistance of the sleeper can be further secured. Therefore, it is possible to achieve the prescribed standard value set as the roadbed lateral resistance of sleepers for long rails in order to prevent rail overhang in summer, and it is sufficiently applied to sleepers for long rails that require high roadside lateral resistance. We can provide sleepers that can be used.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a sleeper for a long rail according to an embodiment of the present invention.

FIG. 2 is a plan view of a sleeper for a long rail according to an embodiment of the present invention.

FIG. 3 is a perspective view of a sleeper for a long rail according to an embodiment of the present invention.

[Explanation of symbols]

 10 sleeper body 11 rail support 12 rail 17 upper plate 18 side plate 19 end face plate 22 protrusion 23 resistance plate

Claims (1)

[Claims] 1. A plurality of spike-like projections projecting downward are provided at the lower edges of both side plates of a hollow box-shaped sleeper body which is open at the bottom and can be filled with ballast inside, and both end face plates of the sleeper body are further provided. A sleeper for long rails, characterized in that a flat plate-shaped resistance plate is provided on the lower edge so as to project downward over at least the entire length.