DYWIDAG Prestressing Systems using Bars

System Overview

DYWIDAG Prestressing Systems using Bars - schema
Bonded bar tendons26 WR32 WR36 WR40 WR47 WR32 WS36 WS
QR-plate anchorage with additional reinforcement
QR-plate anchorage without additional reinforcement
Rectangular solid plate anchorage with additional reinforcement
Rectangular solid plate anchorage without additional reinforcement
Square solid plate anchorage without additional reinforcement
Unbonded and external bar tendons 
Rectangular solid plate anchorage with additional reinforcement
Square solid plate anchorage without additional reinforcement

Overview of anchorages

DYWIDAG Bonded Stressing AnchorageStressing anchorage, bonded
  1. anchor plate
  2. domed anchor nut
  3. prestressing bar WR/WS
  4. retaining nut
  5. sealing ring
  6. grout cap
  7. toroidal ring
  8. hex nut
The bar is fixed to the anchorage plate by the domed anchor nut and the retaining nut, the latter of which is fixed to the scaffolding. The retaining nut provides the connection to the duct. Grouting is performed through the grout cap, the domed anchor nut with the three grout slots and the retaining nut.
DYWIDAG Bonded Fixed AnchorageFixed anchorage, bonded
  1. anchor plate
  2. domed anchor nut
  3. prestressing bar WR/WS
  4. duct sleeve B
Usually, the fixed anchorage is completely embedded in the concrete. The domed anchor nut is tack welded perpendicularly onto the anchor plate. The duct sleeve B ends directly at the anchor plate, where the duct is both injected and vented. A fixed anchorage can be designed as stressing anchorage; the required bar-over length for the stressing can be dispensed.
DYWIDAG Unbonded Stressing AnchorageStressing ancorage, unbonded
  1. anchor plate with connection tube
  2. domed anchor nut
  3. prestressing bar WR/WS
  4. heatshrinking sleeve
  5. tube
In order to prevent the intrusion of water in the anchorage region, a connection tube is welded to the anchor plate to bridge the gap behind the anchor plate. Different corrosion protection systems are available.
DYWIDAG Unbonded Fixed AnchorageFixed anchorage, unbonded
  1. anchor plate
  2. domed anchor nut
  3. prestressing bar WR/WS
  4. heatshrinking sleeve
  5. tube
Usually, the fixed anchorage is completely embedded in the concrete. The domed anchor nut is tack welded perpendicularly onto the anchor plate. The prestressing bar is provided with the respective corrosion protection. The fixed anchorage can also serve as unbonded stressing anchorage.