Strand Jacks

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 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. Our sophisticated SCC software program synchronizes the motion of the strand jacks and adjusts the motion to the loads per lifting point.

Enerpac strand jacks are available with two types of strand: a standard strand of 0.62" and compact strand of 0.71". The 0.62" strand can work with a dynamic load of 12 tons. The 0.71" strand can work with a dynamic load of 17 tons. The number and type of strands used in a jack determine the safe working load of a jack. For lifting applications Enerpac strand jacks are calculated with a 2.5 safety factor against breaking load to working load.

Enerpac strand jack systems are available from 34 up to 1124 ton capacity. We also provide a full range of accessories like a strand guide, strand dispenser and recoiler. All systems are certified and tested under Lloyd’s witness. Each installation is delivered with an instruction and operation manual in English.

Strand sizeModel NumberCapacity
(Tons)
Operating Pressure
(psi)
Strands

Power Packs
(hp)

Lifting Speed*
(meters/hr)
0.62"HSL3003417713710
HSL70079315771013
HSL2000225354219106
HSL3000337354231206
HSL5000562539048256
       
0.71"HSL4505126183710
HSL60067277241013
HSL100011232347109
HSL2000225354212106
HSL3000337354219206
HSL4500506477431256
HSL6500731546743407
HSL8500955539055406
HSL100001124477466505

*Lifting speed is based on strand jack capacity in combination with suggested power pack. When higher lifting speeds are required, we will supply bigger power packs

  • Stroke 18.9" (17.7" effective)
  • Electric motor 480 VAC 50/60Hz
  • Tube bank: full nickel plated telescopic strand guiding
  • Anchor block: high grade steel 42CrMo4

Standard Configuration

  • Set of 4 Strandjacks
  • 4 fixed anchors
  • 1 SCC Control System
  • 4 data cables 50 meters
  • 4 Hose sets, standard length 5 meters each
  • Strand dispenser

Accessories

  • Strand Dispenser
  • Strand Guide
  • Strand Recoiler
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