JPH0573001U - Metal box sleepers - Google Patents

Abstract

(57) [Summary] [Purpose] Without losing the lightness of metal box sleepers,
The occurrence of buckling deformation is prevented. [Structure] An opening 12 is provided at the bottom of the sleeper 11 and the inside thereof is formed into a hollow shape. Loading section that receives the load from the rail 15
A reinforcing member such as a rib 19 and a thick portion 22 is provided on at least one of the center 17 and the central portion 18 in the length direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal box sleeper.

[0002]

[Prior Art]

 As an alternative to the traditional wooden sleepers and concrete sleepers, metal box-shaped sleepers with an open bottom and a hollow interior have been proposed. According to this metal box-type sleeper, since the inside is hollow, it is extremely lightweight, and since it is made of cast iron or the like, it is possible to provide an extremely strong sleeper.

[0003]

[Problems to be solved by the device]

 However, because of the structure in which the bottom is open and the inside is hollow, buckling deformation may occur when a load is applied.

FIG. 8 and FIG. 9 show buckling deformation of a loading portion that receives a load from a rail. That is, the metal box-type sleeper 1 has an opening 2 formed in the bottom and a hollow interior, and its side portions are slightly divergent from the top to the bottom. 3 and the end 4 are formed to be inclined. A pair of rails 5 are fastened to the upper surface of the sleeper 1 using a known fastening device (not shown).

In such a configuration, when a load is applied from a vehicle traveling on the rail 5, the load causes the portion 6 corresponding to the rail fastening portion of the side portion 3 to extend the length of the rail 5 as shown in the figure. There is a risk that it will deform outwardly in the direction and buckle.

On the other hand, FIGS. 10 and 11 show a case where the central portion of the sleeper 1 is buckled and deformed due to the load from the rail 5. In this case, the reaction force R from the gravel 8 acts on the load F from the rail at the central portion 7 of the sleeper 1, and the bending load is applied to the entire sleeper 1. There is a possibility that buckling deformation occurs in the central portion 7 as shown in.

As a countermeasure against this, conventionally, the wall thickness of the entire sleeper is increased or the skirt length of the side portion 3 is increased to improve the section modulus. However, doing so has a problem in that the lightness, which is a feature of the metal box sleepers, is lost.

Therefore, the present invention has an object to solve such a problem and to prevent the occurrence of buckling deformation without losing the lightness of the metal box-shaped sleeper.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention forms a hollow inside by opening the bottom part of the sleeper, and at least one of a loading part for receiving a load from a rail and a central part in the longitudinal direction. It is provided with a reinforcing member.

[0010]

[Action]

 According to this structure, since the reinforcing member is provided only in the portion to which the load is applied and the thickness of other portions is not increased, the metal box-type sleeper that is lightweight and does not cause buckling deformation is used. Obtainable.

[0011]

【Example】

 In FIGS. 1 and 2, reference numeral 11 denotes a metal box-type sleeper according to the present invention, and like the one shown in FIGS. 8 to 11, an opening 12 is formed at the bottom and the inside thereof is hollow. Therefore, it is cast from a material such as ductile cast iron. 13 is the side part, and 14 is the end part, which are formed to be slanted so as to be slightly flared. Reference numeral 15 denotes a pair of rails, which are fastened to the sleeper 11 by a known fastening device 16. In the sleeper 11, a rib 19 as a reinforcing member that connects the both side portions 13 is formed by integral casting with the sleeper 11 in the loading portion 17 immediately below the rail 15 and the central portion 18 in the length direction. ..

In such a configuration, the main cause of buckling deformation is that the side portions 13 spread in the length direction of the rail 15. Therefore, by connecting the side portions 13 with the ribs 19 as described above, it is possible to prevent the expansion which is the cause of the buckling deformation. No special treatment is applied to parts other than the part where buckling deformation is likely to occur, and weight does not increase due to increase in wall thickness, so it is a metal box that is lightweight yet effectively prevents buckling deformation. You can get a shape sleeper 11.

The rib 19 may be provided only on one of the loading portion 17 and the central portion 18 where buckling deformation easily occurs. Further, as shown in FIG. 2, the periphery of the opening 12 at the bottom of the sleeper is formed thicker than other portions so that a good anticorrosion effect can be obtained in that portion. As shown in FIG. 1, the end portion 14 is formed longer than the side portion 13 so as to secure a rolling resistance force. Of course, if such resistance is not required, the end portion 14 may be formed to have the same length as the side portion.

FIG. 3 shows a modification of the rib 19. 1 and 2, the upper edge 20 of the rib 19 was separated from the upper portion 21 of the sleeper 11, but this upper edge 20 is now integrated with the upper portion 21. By doing so, the ribs 19 are connected not only to the side parts 13 but also to the upper part 21, and the entire sleeper 11 is further strengthened.

4 to 7 show another embodiment of the present invention. Here, the thick portion 22 as a reinforcing member is formed with a predetermined width and thickness on the inner surface of the sleeper 11 corresponding to the loading portion 17 and the central portion 18, respectively. Except for these specific thick portions 22, there is no increase in wall thickness as shown in FIG. 6 and no accompanying increase in weight.

Also in this embodiment, the thick portion 22 can be provided only on one of the loading portion 17 and the central portion 18. Further, when particularly strong strength is required, both the thick portion 22 and the rib 19 may be provided together.

[0017]

As described above, according to the present invention, the bottom of the sleeper is opened to form a hollow interior, and the loading portion for receiving the load from the rail and the central portion in the longitudinal direction are small. Since the reinforcing member is provided on at least one of them, the reinforcing member is provided only on the part to which the load is applied, and it is not necessary to increase the thickness of the other parts, so that it is lightweight and prevents buckling deformation. You can get metal box sleepers.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a laid state of a metal box-type sleeper according to an embodiment of the present invention.

2 is a cross-sectional view of the sleeper of FIG.

FIG. 3 is a diagram showing a modification of the portion shown in FIG.

FIG. 4 is a perspective view of a metal box sleeper according to another embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a laid state of the sleeper shown in FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a plan view showing how buckling deformation occurs in a conventional metal box-type sleeper.

9 is a cross-sectional view of the portion shown in FIG.

FIG. 10 is a front view showing another buckling deformation state of the conventional metal box-type sleeper.

11 is a plan view of the portion shown in FIG. 10.

[Explanation of symbols]

 11 Metal box sleepers 12 Opening 17 Loading section 18 Center section 19 Rib 22 Thick section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Inada 2-26 Ohama-cho, Amagasaki-shi, Hyogo Stock company Kubota Mukogawa Factory

Claims (1)

[Scope of utility model registration request] 1. A bottom portion is opened to form a hollow inside, and a reinforcing member is provided on at least one of a loading portion for receiving a load from a rail and a central portion in the length direction. A metal box-shaped sleeper.