ENERPAC’S hydraulic stressing cylinder will be used by Post Tensioning and Grouting to simultaneously tension dozens of high tensile stressing strands for a New Zealand bridge.
According to the company, the 900-tonne hydraulic stressing cylinder is the first of its type to be introduced to Oceania. It was supplied and customised by Jonel Hydraulics.
The construction company claims the cylinder will allow the beams to be stressed on-site, accelerating the work pace and simplifying the stressing work to make it safer.
The Enerpac cylinders are made at a specialist plant in Europe. A range of cylinders are used in prestressing operations for the stressing of single- and multi-strand systems.
Many include hydraulic nose cones which push the locking wedges in place mechanically after the first extension. The cylinder then retracts and extends again to repeat the operation as many times as needed.
Multi-strand stressing heads of custom configurations are also available, while inner guide tubes for the high tensile strand to pass through shortens the operation time by eliminating the need to manually line up the strand to the wedge head assemblies.

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