| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ladder sleeper for ballast, which can surely and effectively inhibit displacement of a ladder track by making the ladder track possess sufficient longitudinal resistance of the ballast, and the ladder track for the ballast, using the ladder sleeper. <P>SOLUTION: A longitudinal resistance member elongated downward is integrally disposed on an undersurface of a longitudinal beam 2 and/or an undersurface of an end closure beam 3. Thus, longitudinal resistance of ballast in a longitudinal direction of a railroad track is increased. For example, the longitudinal resistance member is a concrete protrusion 11, a reinforcement 12 protruded in a U-shape, a rubber pad 13, or pieces 14-16 of shape steel, which are bound to an insert, embedded in the undersurface of the longitudinal beam and/or the undersurface of the end closure beam, by means of a bolt 17. <P>COPYRIGHT: (C)2012,JPO&INPIT |
