Device for controlling the pre-stressing of an anchoring bolt

摘要

The element (9) consists of an inherently stable thrust ring (12) and an expansion ring (13). At least one of the contact faces between the rings is formed as a conical ring face (14,15). The screw element (6) applies a tension force to the control element. The force applies a radial force component, to expand the expansion ring. When the screw element is in end position, it engages on both rings, when the max. relative axial displacement between the rings has been reached. In this position, the screw element engages on the end face of a ring, which is formed as a friction surface.