| 摘要 |
PROBLEM TO BE SOLVED: To provide a sleeper, in particular, a branched sleeper and a sleeper provided in a joint part of rails capable of preventing shifting sideways and reduction of strength due to wear even if settlement of track, vibration, and sideways shifting force occur. SOLUTION: A wear-resistant material layer is provided on a bottom face of a sleeper main body, and many holes catching a ballast material are provided in the wear-resistant material layer. As for a size of the hole, it is preferable that a length in the longitudinal direction of the sleeper is 3 to 25 mm, an area of the hole occupying an area of the wear-resistant material layer is 40 to 80%, and a depth of the hole is 3 mm to a thickness of the wear-resistant material layer or less. The wear-resistant material layer is provided at a position where a load is directly applied from the rail of the sleeper, a length in the longitudinal direction of the sleeper is a width at which a load is directly applied or more and 40% or less of the length of the sleeper, and a thickness is 10 mm or more.
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