Sock for a ballastless rail track tie

A sock for a tie of ballastless rail track that is to be held in a bed of concrete, the sock comprising firstly an elastically deformable case with an inside wall and a bottom, said case receiving a tie with a chamfered bottom edge of predetermined height, and secondly a pad of a predetermined thickness lying beneath the tie at the bottom of said case, wherein the case adjacent its bottom includes, in its inside wall, recesses guaranteeing compression flexibility thereto even after said wall has been deformed under the effect of hydrostatic pressure from a concrete bed, the inside wall, between the recesses, including stiffeners formed by projections or extra thickness serving to reinforce said wall, said stiffeners being formed adjacent the bottom of said case over a height corresponding to the thickness of the pad.

A sock for a tie of ballastless rail track that is to be held in a bed of concrete, the sock comprising firstly an elastically deformable case with an inside wall and a bottom, said case receiving a tie with a chamfered bottom edge of predetermined height, and secondly a pad of a predetermined thickness lying beneath the tie at the bottom of said case, wherein the case adjacent its bottom includes, in its inside wall, recesses guaranteeing compression flexibility thereto even after said wall has been deformed under the effect of hydrostatic pressure from a concrete bed, said recesses being in the form of fluting and wherein the fluting have chamfered ends.