Device for detecting optical and / or acoustic signals in a prestressing tendon

Abstract

Device and method for detecting optical and / or acoustic signals, in particular those resulting from wire breaks, in a tendon (8), wherein the tendon (8) has a tension element (9), wherein the tension element (9) comprises at least one prestressing steel strand (17) and has an anchorage (42) at each of its two ends, wherein the at least one prestressing steel strand (17) is force-fit connected to the surrounding building material, in particular concrete or cement mortar (16), and comprises a core wire (40) and at least six outer wires (41), wherein the core wire (40) of at least one prestressing steel strand (17) of the tendon (8) is designed as an optical cable (14), wherein the optical cable (14) has a sheath (21), is surrounded by at least six outer wires (41), in particular surrounded and connected to them, and is led out of the tendon (8) at at least one anchorage (42).and - is connectable to an optical measuring and processing unit (15) for optically measuring strain changes and / or strain rates along the longitudinal extent of the optical cable (14), and - wherein the optical cable (14) comprises several optical fibers (19), wherein at least one optical fiber (19) is loosely guided in the optical cable (14) and wherein at least one optical fiber (19) is rigidly connected to the optical cable (14).