Railway Technical Research Institute

Sumitomo Metal Industries, Inc.

Hiromi Inoue

Hajime Wakui

Nobuyuki Matsumoto

Saburo Inoue

Yoshitaka Soga

To provide inexpensively a connector constructed of a steel pipe and bearing a tie function of a ladder-type sleeper for railway tracks, in a connector constructed of a steel pipe 1 used in the ladder-type sleeper for railway tracks integrated with longitudinal beams made of concrete and the connectors constructed of steel pipes 1 by feeding concrete, both end portions of the connector constructed of the steel pipe 1 are flattened in the horizontal direction and a corrosion resistant coating 4 is coated at portions of the connector constructed of the steel pipe 1 exposed to the atmosphere.

Steel pipe connector of ladder-type sleeper for railway track

The present invention comprises longitudinal beams provided on the underside of each of a pair of rails in the longitudinal direction of the rails and multiple connectors which mutually connect these longitudinal beams at designated spacings along the longitudinal direction. Because the ladder-type sleepers of the present invention have a structure wherein longitudinal beams are continuously positioned along the longitudinal direction of the rails, the bending stiffness of the track frame in the longitudinal direction increases, and the ballast pressure is reduced by improving the distribution of the train load. As a result, it is possible to reduce track irregularities resulting from the repeated burden of the train load.

Growing community of inventors

Chofu, Japan

Hiromi Inoue