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 15,7mm and compact strand of 18mm. The 15,7mm strand can work with a dynamic load of 110kN. The 18mm strand can work with a dynamic load of 155kN. 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 30 up to 1.000 tonne 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
(kN)
Operating Pressure
(bar)
Strands

Power Packs
(kW)

Lifting Speed*
(meters/hr)
15,7 mmHSL30030011535,510
HSL70070020577,513
HSL20002.000230197,56
HSL30003.00023031156
HSL50005.0003504818,56
       
18 mmHSL45045017035,510
HSL60060018047,513
HSL10001.00021077,59
HSL20002.000230127,56
HSL30003.00023019156
HSL45004.5003103118,56
HSL65006.50035543307
HSL85008.50035055306
HSL1000010.00031066375

*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 480 mm (450 mm effective)
  • Electric motor 380-440 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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