Concrete screw and method for anchoring a screw in a concrete base

The invention relates to a concrete screw (10) having a shank portion (12), a threaded portion (14) which is arranged at the front end of the concrete screw (10) and is provided with at least one expanding slot (18) and a spreading element (22), the said expanding slot (18) is associated in such a way that the expansion element (22) during the screwing expands the expanding slot (18). The invention also relates to a method and a tangential impact (30) for setting such a concrete screw (10).