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Strand jack - Wikipedia
A strand jack (also known as strandjack) is a jack used to lift very heavy (e.g. thousands tons or more with multiple jacks) loads for construction and engineering purposes. Strandjacking was invented by VSL Australia's Patrick Kilkeary & Bruce Ramsay in 1969 for concrete post tensioning systems, and are now used all over the world for heavy lifting, to erect bridges, offshore structures ...
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Hydraulic Strand Jacks | Strand Jack Systems | Enerpac
The strand jack lifting technique originates from the concrete post tensioning principle. A strand jack can be considered a linear winch. In a strand jack, a bundle of steel cables or strands are guided through a hydraulic cylinder; above and below the cylinder are anchor systems with wedges that grip the strand …
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Strand jack system - mammoet.com
A strand jack is a system similar to a jack, however in this case the load is not pushed up, but the jack pulls up a bundle of wires, which is called a strand. The system has two clamps: the bottom clamp is fixed and the upper clamp is connected to a hydraulic cylinder that can move up and down. Both clamps are gripping a steel wire. To start lifting the bottom clamp releases the wire and the ...
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Strand Jacks - WB Equipment
Strand jacks are specially configured hydraulic jacks, which can give continuous pulling or lifting movement. A combination of a number of strand jacks can lift very heavy loads of thousands of tons, whereas the jack itself weighs less and occupies only a very small footprint. Hydraulic jacks are small devices that can do a large work using hydraulic pressure.Author: Johnzactruba
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What is a Strand Jack. What are Strand Jacks?
HEAVY LIFTING. The VSL hydraulic strand lifting system provides a custom-engineered solution for the toughest jobs. It combines proven components from VSL’s strand post-tensioning system with hydraulic jacks and pumps to lift heavy loads safely and economically.
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VSL | Heavy Lifting
Cable Management System The strand jacks employ a strand management system consisting of a strand guide and re-coiler. Other strand jack systems usually have the strands hanging free from the jack instead of being coiled (as shown). Olmsted’s system keeps the strands coiled and only allows the length needed for each lift to be deployed.
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Hydraulic Strand Jacks - Bigge Crane and Rigging
Bigge uses strand jacks to erect bridges, offshore structures, refineries, power stations, major buildings, and other structures. When the project is suited to their use, strand jacks are a safe and inexpensive alternative to using a heavy lift crane.
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VSL | Post-tensioning strand systems | Post tension
Post-tensioning strand systems. VSL designs, manufactures and installs durable, state-of-the-art post-tensioning systems that comply with international standards and approval guidelines for both new and existing structures.
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