Patent ID: 8840036

Claim:
A screw anchor for a concrete attachment into a railroad tie or non-ballasted track and a force-fit connection by means of a rail screw comprising: a threaded section with external threads with thread pitch disposed on an exterior of the screw anchor and internal threads with thread pitch disposed inside the screw anchor, and an upper partial section without external threads which is disposed in a mounted state close to an anchor opening of the screw anchor and wherein an upper end surface of the upper partial section is flush with an upper side of the rail road tie or non-ballasted track in the mounted state; characterized in that a material with high elasticity is disposed on or around the upper partial section, wherein said material when in the mounted state under a radial pressure forms a projecting elevation which extends in an upward direction over the upper surface of the upper partial section and thereby also over the upper side of the railroad tie or non-ballasted track and forms an upstream barrier for water collected on an upper side of the tie or non-ballasted track, and reduces a free opening section of an inner chamber of the upper partial section so that a configuration of the anchor forms a seal upwards and inwards.