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 size Model Number Capacity
(kN)
Operating Pressure
(bar)
Strands

Power Packs
(kW)

Lifting Speed*
(meters/hr)
15,7 mm HSL300 300 115 3 5,5 10
HSL700 700 205 7 7,5 13
HSL2000 2.000 230 19 7,5 6
HSL3000 3.000 230 31 15 6
HSL5000 5.000 350 48 18,5 6
             
18 mm HSL450 450 170 3 5,5 10
HSL600 600 180 4 7,5 13
HSL1000 1.000 210 7 7,5 9
HSL2000 2.000 230 12 7,5 6
HSL3000 3.000 230 19 15 6
HSL4500 4.500 310 31 18,5 6
HSL6500 6.500 355 43 30 7
HSL8500 8.500 350 55 30 6
HSL10000 10.000 310 66 37 5

*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
Strand size Model Number Capacity
(Tons)
Operating Pressure
(psi)
Strands

Power Packs
(hp)

Lifting Speed*
(meters/hr)
0.62" HSL300 34 1771 3 7 10
HSL700 79 3157 7 10 13
HSL2000 225 3542 19 10 6
HSL3000 337 3542 31 20 6
HSL5000 562 5390 48 25 6
             
0.71" HSL450 51 2618 3 7 10
HSL600 67 2772 4 10 13
HSL1000 112 3234 7 10 9
HSL2000 225 3542 12 10 6
HSL3000 337 3542 19 20 6
HSL4500 506 4774 31 25 6
HSL6500 731 5467 43 40 7
HSL8500 955 5390 55 40 6
HSL10000 1124 4774 66 50 5

*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

Erecting the San Francisco Bay Bridge Suspension Span

Erecting the San Francisco Bay Bridge Suspension Span
From accurate positioning of deck sections to precision lifting of cross-beams, state-of-the art hydraulics facilitated the construction of the Bay Bridge self-anchored suspension span.

 

 
Lifting the Songdo Cable-Stayed Bridge Pylons

Lifting the Songdo Cable-Stayed Bridge Pylons
Four HSL8500 strand jacks were installed on top of a temporary bent tower and simultaneously lifted both pylons up to their permanent position at 75 degrees

 

 
Lifting 2,000 ton Steel Roof Sections at Abu Dhabi Airport Hangar

Lifting 2,000 ton Steel Roof Sections at Abu Dhabi Airport Hangar
At Abu Dhabi Airport, United Arab Emirates, 3 enormous steel roofs, 2000 ton each, constructed at ground level were lifted 131 feet (40 meters), using Enerpac HSL-Series strand jacks, creating aircraft maintenance hangers.

 

 
Lifting the London Eye

Lifting the London Eye
An innovative mega crane powered by HSL-Series strand jacks successfully lifted the London Eye, the world’s tallest (135 meters) cantilevered observation wheel.

 

 
Strand Lifting Hoist Iron Ore Mills

Strand Lifting Hoist Iron Ore Mills
Twelve 800 ton ball mills and 1400 ton autogenous mills were installed at the Sino Iron Ore project using eight 444 ton strand jacks. The PLC controlled strand jacks lifted then lowered the ore mills onto their bearing housings.

 

POWERFUL SOLUTIONS. GLOBAL FORCE.