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Which of the following systems is used for pre-tensioning?

Which of the following systems is used for pre-tensioning? Correct Answer  Hoyer’s long line system

Concept:

Hoyer’s long line method is the system used in pre-tensioning.

The other systems like Freyssinet, Gifford-Udall, and Magne-Baton are post-tensioning systems and a large number of beams are produced in an individual alignment.

  1. In the Freyssinet system, anchorage consists of cylinders of good quality concrete and is provided with corrugations on the outside. It has a central conical hole and is provided with heavy top reinforcement.
  2. In the Gifford-Udall system, the wire is stressed and anchored one by one in a separate cylinder using a small wedding grip called Udall grips. Each grip consists of two split cones.
  3. In the Lee MC Call system anchoring of bars is done by screwing special threaded nuts. The nuts bear against a distribution plate provided at the end of the beam.
  4. In the Magnel Blaton system, the wires are anchored by wedging, two at a time into sandwich plates. The sandwich plates are provided with two wedge-shaped grooves on their two faces. The wires are taken into each groove and tightened. Then a steel wedge is driven between the tightened wires to anchor them against the plate.

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