How Strand Jacks Work
The operation of a strand jack system is based on the principle of concrete post-tensioning. Steel cable bundles, or strands, pass through a hydraulic cylinder, with anchor systems positioned above and below to grip the strands. The hydraulic cylinder’s motion, combined with the locking and unlocking action of the anchors, creates precise lifting or lowering movements. Enerpac’s strand jacks can handle loads ranging from 17 to 1,405 tons and operate with pressures up to 5,000 psi, making them suitable for diverse applications.
Advantages of Strand Jacks
Compared to traditional lifting methods, strand jacks provide a smaller footprint and unparalleled precision. Enerpac’s systems allow for synchronized control of multiple jacks via advanced Smart Cylinder Control (SCC) technology, enabling a single operator to manage the entire operation safely. This level of control is especially beneficial in environments requiring high accuracy, such as lifting heavy structures or positioning components in confined spaces.
Components and Accessories
Enerpac strand jacks are supported by robust accessories, including hydraulic power packs, strand guide tubes, and recoilers. The strands themselves are constructed from high-capacity steel and meet rigorous safety standards, with a minimum safety factor of 2.5 times the working load. Protective coatings like Lunac ensure durability in harsh environments, including marine conditions.
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