Enerpac strand jacks used for innovative tower scaffolding system

MENOMONEE FALLS, WI — Enerpac, an international market leader in high-pressure hydraulics, has supplied Korean based engineering company, KLES, with strand jacks for an innovative tower scaffolding system called SKYFFOLDING™. The Enerpac HSL1507 strand jacks support and lift the pendant-type, scaffolding system, as it grows, providing a safer working environment than traditional scaffolding during power plant boiler furnace maintenance.

Traditional scaffolding is a stacked structure constructed from bottom to top, concentrating the total load on the base. Typically, 70m high, the height varies according to the boiler size of the thermal power plant. In the event that lower levels of scaffolding are damaged, it may trigger a complete collapse with potentially disastrous consequences. In an effort to reduce the risk of collapse, KLES has developed the SKYFFOLDING™ system, a new approach that reverses the order of scaffolding construction from top to bottom.

Innovative Scaffolding Tower
The SKYFOLDING™ lifting system involves the installation of a network of [typically] 20 Enerpac strand jacks onto a heavy girder at the top of the boiler. The strand jack wires are lowered and connected to uphold and lift a support platform, the uppermost support frame of the scaffold system. Robust wire ropes connected to the support frame used to support pendant scaffold platforms attached beneath at 2m intervals by repetitively jacking up the platforms with the SKYFOLDING™ lifting system. Each pendant platform features an integral staircase allowing easy of movement between each level. This allows the synchronized strand jacks to hold and lift the entire scaffolding as a single unit.

The synchronized SKYFFOLDING™ system is able to reliably and safely lift the scaffolds with even load dispersion, keeping deviations in lateral and vertical directions to a minimum. As an additional safety measure, special fail-proof fasteners on the suspended platform have been designed so the grip on the wire rope increases in direct proportion to the load applied as the scaffolding structure grows. In consequence, the stability of the entire scaffolding system is maintained even if structural problems occur at the lower levels, unlike a conventional scaffolding tower.

Enerpac Strand Jacks
The 17-ton capacity Enerpac HSL1507 strand jack acts like a linear winch. A bundle of steel cables or strands are guided through a hydraulic cylinder. Above and below the cylinder, anchor systems with wedges grip the strand bundle. By stroking the cylinder in and out while the grips are engaged in the anchors, a lifting or lowering movement is achieved.

The motion of the cylinders is driven by hydraulic power packs. They can be electric or diesel powered. Enerpac’s SCC software program synchronizes the motion of the strand jacks and adjusts the motion to the loads per lifting point.
The SKYFFOLDING™ system has been deployed for boiler maintenance in a number of major thermal power plants.
For more information on Enerpac strand jacks, visit www.enerpac.com .

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