METHOD TO REPAIR UNDERBALLAST LAYER OF RAILWAY TRACK Russian patent published in 2011 - IPC E01B27/20 

FIELD: construction.

SUBSTANCE: method to repair an underballast layer of a railway track includes removal of old crushed stone to clean earth bed, filling a protective underballast layer onto the cleaned earth bed and its compaction, filling new crushed stone. The protective underballast layer is compacted by a track machine in two stages. At the first stage compaction is executed with application of assembled rails and sleepers with rail length of 25 m in each link. At the second stage the compaction is carried out with application of assembled rails and sleepers, having the rail length in a single link at least by 150-200 mm less than in the ones used at the first stage. At the first stage the compaction is carried out with application of used rails. At the first stage the compaction is carried out with application of used rails or new rails laid instead of used ones.

EFFECT: increased extent of the protective underballast layer compaction.

3 cl, 5 dwg