What is a Strand Jack?
Strand jacks function much like linear winches. A bundle of steel cables or strands are guided through a hydraulic cylinder; either above or below this cylinder there are anchor systems with wedge grippers to engage and disengage these wedge grips for lifting or lowering movement by simply stroking the cylinder back and forth while engaging these grips.
Early Life and Education
He was born in Sligo, Ireland and developed into a hardworking and competitive individual who excelled at many subjects – his art took particular note, beginning to paint at an early age. Additionally, he excelled in school.
Strand jacks are used to lift heavy loads in areas where cranes cannot access. They are small hydraulic cylinder jacks that provide a powerful lifting force, featuring grips which alternately grab and release strands for linear movement, all controlled by computers to ensure precise stroke control.
Enerpac offers several models, from 30 tonnes up to 1000 tonnes capacity, that come equipped with all of the accessories necessary for smooth operation, including strand guides, dispensers and recoilers.
A strand jack is an industrial machine used for lifting or lowering extremely heavy loads. It consists of an arrangement of steel cables or strands passing through a hydraulic cylinder jack with anchor systems at both ends; each anchor system contains wedges which grip and release the bundle periodically.
STRAND JACKS are used for construction of skybridges, power plants, shipyards and other major projects such as sky bridges. Additionally, they’re often employed for transporting and installing precast concrete panels. As it is an advanced form of heavy lifting that works effectively in tight spaces where conventional cranes cannot, strand jacks provide an alternative heavy lifting option that’s both precise and safe.
Strand jacks require a large hydraulic power pack to supply oil for operation, which may either be electric or diesel powered. Furthermore, these machines may come equipped with safety circuits, emergency stops, remote pendant controls or both for added control and convenience.
Achievement and Honors
Strand jacks are used in engineering to lift heavy loads when cranes are impractical or too costly, using a hollow hydraulic cylinder with strand bundles routed through it and anchor systems on either end that grip it for stability. Stroking this cylinder back and forth with either an electric or diesel powered hydraulic power pack allows lifting or lowering movements to take place.
NASA recently awarded Christopher Cox, owner of Engineered Rigging, for safely and on-time completing structural test stands for Block 1B and Block 2 designs of its Space Launch System. Cox credits a pre-planning effort that included weekly jobsite meetings, hiring an independent third-party to check and calibrate equipment, as well as discussions to address potential issues.
Strand jack systems utilize steel cable (or strands) bundles guided through a hollow hydraulic cylinder; above and below this system are anchor systems equipped with wedges to grip them securely, and by manipulating this mechanism in and out, lifting/lowering movements are accomplished.
Single strand jacks can lift several thousand tons at one time; however, when used together under computer control to move even heavier objects. They’re compact yet powerful – perfect for places a crane wouldn’t fit, like lifting prefabricated sections of buildings or oil rigs from construction sites. Their exertion of force is direct as opposed to losing strength as cranes lift. Plus they’re much cheaper to run. Often found used in construction as prefab sections are lifted off site.
Strand jacks are powerful tools for heavy lifting, capable of accomplishing feats that no crane could. Used for everything from lifting bridges across gorges to skidding massive rigs onto barges, they have many applications in construction and engineering projects alike.
Bigge Crane & Rigging provided their services on the San Francisco Oakland Bay Bridge, a complex steel and concrete structure connecting two major cities at their respective bays. Working closely with Bigge’s engineering department, Hydrospex strand jacks were used to raise transition spans on either end of the bridge using computer control technology.
The Strand Jack Control System features a pre-tensioning function to easily adjust initial tension settings, shortening adjustment time, decreasing worker hours spent making adjustments, and increasing efficiency of work performance. Furthermore, this invention features an incision in its lower clamp for inspection and repair purposes.