High fatigue strength threaded concrete stress bars anchorage - involves sliding bars through hard setting plastics in annular space near threads

摘要

The thread, nut, and anchor plate (4) are supported on hard-set concrete to provide anchorage for stress bars (1) for prestressing concrete structures with subsequent bonding. A ring-shaped damming and/or storage space (6) is provided in front of the threads in the nut (2) in the area of anchorage. Before stressing, this is filled with subsequently hard-setting plastics. On stressing, the bar slides through it, carrying the plastics with it in its threads, along the stressing length. Plastics may set hard after stressing, with or without heating, and may have thixotropic, corrosion resistant, stabilising additives.