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Bonded Strand Post-Tensioning System - Installation

Bonded Strand Post-Tensioning System


DYWIDAG-Systems International has developed three different methods to insert strands into ducts. The selection of the insertion method depends on the boundary conditions of the structure and the job site.

1. coil 2. pushing device 3. strand 4. tube 5. cutting device
Bonded Strand Post-Tensioning System :: Method 1: Pushing

Method 1: Pushing

To push strands into the duct on the job site is very economical and can be done either before or after casting the concrete. The pushing equipment can be installed remotely and connected flexibly to the insertion point. DSI strand pushers provide relatively high speed of up to 8 m/s and require minimal operating personnel of only two men. These advantages make this method the preferred standard for strand installation.

Bonded Strand Post-Tensioning System :: Method 2: Pulling

Method 2: Pulling

To install strands while pulling them into the duct can be very efficient in special structures, for example where the loop anchorage is used. In normal cases, the whole bundle of strands is pulled through winching with a steel cable.

  1. crane
  2. reel
  3. tendons (strand)
  4. pulling rope
  5. winch
  6. tendons (strand)
  7. DSI pulling head
Bonded Strand Post-Tensioning System :: Method 3: Pre-Assembled Tendons

Method 3: Pre-Assembled Tendons

The prefabrication of tendons either in the shop or in the field can also be very economical, especially with shorter tendons and short shipping distances. Special uncoilers or hydraulic winches are necessary to properly install the tendons in the structure.

For more detailed information, please have a look at the brochure “DYWIDAG Bonded Post-Tensioning Systems using Strands“ available in the download box on this page.

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