METHOD FOR LENGTHENING OF LONG STRINGS OF CONTINUOUS WELDED RAIL TRACK Russian patent published in 2014 - IPC E01B29/17 

FIELD: construction.

SUBSTANCE: invention relates to maintenance and repair of a continuous welded rail track and can be used for lengthening of strings of a continuous welded rail track at re-fixation of long strings for a constant operating mode. A method for lengthening of long strings of a continuous welded rail track involves operations on unfixturing of a rail string from intermediate attachments, lifting with certain force to design height, lengthening and lowering of strings with further attachment. Operations are performed by means of a track-laying crane. When performing works, a string is left unfastened on one side. A head of the rail is grasped with roller antiturning-over grabs and raised to design height with design force with fixation of the latter. The string is conditionally divided into sections of design length, for example two sections. After the first section is passed, string lifting force is relieved; the crane and the formed rail wave to the string end is moved. A string lengthened owing to initial lift is laid. The crane is returned to the lifting force relieve point, i.e. to the end of the first section. An operation on lengthening of the string is repeated in the second section. The crane is moved along the string to its end and the string is fixed behind the crane.

EFFECT: reduction of operating costs for maintenance of the rail track owing to excluding cutting operations of long strings into short strings with their further welding.

3 dwg