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 Diameter Capacity* Model
Number
No. of
Strands
Stroke Weight
mm (in) ton (kN) (mm) (kg)
15,7 (.62) 30 (300) HSL3006 3 480 500
70 (700) HSL7006 7 480 640
200 (2000) HSL20006 19 480 1300
300 (3000) HSL30006 31 480 2180
500 (5000) HSL50006 48 480 3150
18 (.71) 15 (150) HSL1507 1 250 100
45 (450) HSL4507 3 480 500
60 (600) HSL6007 4 480 650
100 (1000) HSL10007 7 480 850
200 (2000) HSL20007 12 480 1400
300 (3000) HSL30007 19 480 2180
450 (4500) HSL45007 31 480 3050
650 (6500) HSL65007 43 480 3950
850 (8500) HSL85007 55 480 5000
1000 (10.000) HSL100007 66 480 7650
1250 (12.500) HSL125007 84 600 8300

* Capacity is based on 2,5 minimum safety factor over strand breaking load. Download brochure for details.
 

Theoretical Lifting Speed (m/hr) *
Strand Jack Capacity 
(ton)
Motor Size (kW) *
2,2 5,5 7,5 15 18,5 30 37 55
15 16
30 12 13 16
45 12 13 16
60 9 10 13
70 9 10 13
100 8 9 11 16
200 6 10 12 15 15
300 7 8 11 11
450 6 7 10 10
500 6 7 10 10
650 8 8 15

* Theoretical lifting speeds. Each application should be evaluated to determine the optimum lifting speed for maximum safety and control. Contact Enerpac for more information.
 

Typical Configuration

  • Set of 4 strand jacks
  • 4 Power Packs
  • 4 fixed anchors
  • 1 SCC Control System
  • 4 data cables 50 meters
  • 4 Hose sets, standard length 5 meters each

Accessories

  • Power Packs
  • Strand Guide
  • Strand Recoiler
  • Strand Dispenser
  • Strand Wedges
  • Heavy-Lifting Strand
Strand Diameter Capacity* Model
Number
No. of
Strands
Stroke Weight
in (mm) (ton) (in) (lbs)
0.62 (15.7) 34 HSL3006 3 18.9 1,102
79 HSL7006 7 18.9 1,411
225 HSL20006 19 18.9 2,860
337 HSL30006 31 18.9 4,820
562 HSL50006 48 18.9 6,930
0.71 (18) 17 HSL1507 1 9.8 220
51 HSL4507 3 18.9 1,102
67 HSL6007 4 18.9 1,433
112 HSL10007 7 18.9 1,874
225 HSL20007 12 18.9 3,086
337 HSL30007 19 18.9 4,290
506 HSL45007 31 18.9 6,724
731 HSL65007 43 18.9 8,690
955 HSL85007 55 18.9 11,023
1124 HSL100007 66 18.9 16,865
1405 HSL125007 84 23.6 18,298

* Capacity is based on 2.5 minimum safety factor over strand breaking load. Download brochure for details.
 

Theoretical Lifting Speed (ft/hr)*
Strand Jack Capacity 
(ton)
Motor Size(hp)
3.0 7.5 10 20 25 40 50 74
17 52
34 39 43 52
51 39 43 52
67 30 33 43
79 30 33 43
112 26 30 36 52
225 20 33 39 49 49
337 23 26 36 36
506 20 23 33 33
562 20 23 33 33
731 26 26 49

* Theoretical lifting speeds. Each application should be evaluated to determine the optimum lifting speed for maximum safety and control. Contact Enerpac for more information.
 

Typical Configuration

  • Set of 4 strand jacks
  • 4 Power Packs
  • 4 fixed anchors
  • 1 SCC Control System
  • 4 data cables 50 meters
  • 4 Hose sets, standard length 5 meters each

Accessories

  • Power Packs
  • Strand Guide
  • Strand Recoiler
  • Strand Dispenser
  • Strand Wedges
  • Heavy-Lifting Strand

Lifting and Installing the Deck Sections of the Golden Horn Metro Bridge

Lifting and Installing the Deck Sections of the Golden Horn Metro Bridge
Strand jacks lifted eleven 300 ton deck sections nearly 17 meters, lifting the deck sections off a barge and installing into position.

 

 
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.

 

Strand Jack features - SCC - Smart Cylinder Control System

SCC - Smart Cylinder Control System
The SCC system provides synchronous lift/lower capability with an accuracy of 0.1”, as well as the ability to operate up to 60 strand jacks simultaneously. This proven control system can be controlled by a single operator from a central location, providing a safe and reliable working environment.

 

Strand Jack features - Telescopic Strand Guide Pipes

Telescopic Strand Guide Pipes
Telescopic strand guide pipes guide the lifting strand through the strand jack, preventing the strands from bird caging and damaging the strand jack.

 

 
Strand Jack features - Specially Treated Strand Wedges

Specially Treated Strand Wedges
All strand wedges are hardened and nickel coated to resist corrosion, resulting in an extra-long life.

 

 
Strand Jack features - Lunac Coated Components

Lunac Coated Components
Internal components are coated with Lunac, an anti-corrosion coating, making our strand jacks suitable for harsh environments.

 

 
Strand Jack features - Optimized Hydraulic Power Packs

Optimized Hydraulic Power Packs
All hydraulic power packs are optimized to work with specific strand jack models. Each power pack is equipped with a variable frequency drive motor for precision control and an integrated hydraulic safety circuit for protection against over pressurization and uncontrolled movement.

 

 
Strand Jack features - Strand Guide

Strand Guide
Strand guides guide strand during lifting and lowering to ensure smooth operation.

 

 
Strand Jack features - Strand Recoiler

Strand Recoiler
Strand recoilers passively pay in or pay out strands while lifting and lowering. Ideal for confined spaces where strands cannot freely hang off the strand guide.

 

 
Strand Jack features - Lloyd’s Certified

Lloyd’s Witnessed
All Enerpac strand jacks are Lloyd’s witnessed to 120% of maximum working load.

 

 
Strand Guide

Strand Guide

  • Provides a guide for the strand as a strand jack lifts the load
  • Capable of feeding the strands into a strand recoiler
  • Adjustable height.
 
Strand Recoiler

Strand Recoiler

  • Passively pays in or pays out strands while jacking and lowering
  • Must be used in combination with an Enerpac strand guide.
 
Strand Dispenser

Strand Dispenser

  • Essential to safely unbundle a new strand coil
  • Provides method for dispensing strand for set-up
 
Strand Wedges

Strand Wedges

  • Specially designed for superior performance with Enerpac strand jacks
  • Three-piece wedge design with a friction grip profile on the inside of each piece
  • Hardened nickel coated wedges for long life and trouble free wedge release
  • Wedges are included with every strand jack purchase and available as spare parts.
 
Heavy-Lifting Strand

Heavy-Lifting Strand

  • Strands available in 0.62 in (15.7 mm) Super or 0.71 in (18 mm) Dyform©
  • Strand jack and strand combinations are designed to meet a minimum 2.5x safety factor to working load
  • Constructed of seven twisted, high-capacity steel wires


 

 

 
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