Jack-Up Systems

The jack-up system is a custom developed multipoint lifting system. A typical system setup includes four jack-up units positioned under each corner of a load. A four unit setup has a lifting capacity of 2,000 metric tons (500 tons per unit).

The lifting frame of a jack-up unit contains four hydraulic cylinders in each corner which lift and stack steel boxes. A load is lifted in increments as boxes are slid into the system, lifted, and stacked; forming ‘lifting towers’. A jack-up system is operated and controlled by a computer control unit. Each unit’s lifting and lowering operations occur simultaneously; the computer control unit’s synchronous technology maintains the balance of the load. The hydraulics power units are embedded within each unit’s lifting frame. Safe lifting heights are dependent on the expected side load.

A Jack-Up System is comprised of 3 main components

  • Multiple jack-up units
    - The most common system setup includes 4 jack-up units.
  • Computer control unit
    - A touch screen control for operating the jack-up system with automatic and manual lifting settings.
  • Electronic power units
    - An integrated electric pump supplies hydraulic power to the system. The power pack is embedded in each unit’s lifting frame.

A Jack-Up Unit is comprised of 6 main components

  • Base frame
    - Supports the lifting frame, skid track attachments are optional.
  • Skid tracks (optional)
    - Enables the jack-up system to be skidded into two directions.
  • Lifting frame
    - Contains hydraulic cylinders located in each corner to lift the boxes and locking strips for stable stacking.
  • Steel Boxes (barrel)
    - Boxes are slid into the lifting frame and are lifted up by the cylinders. Each box is designed to carry a load of 500 metric tons.
  • End box (barrel)
    - The top box the load is placed upon
  • Box insert rollers
    - Rollers facilitate easy entry of boxes into the lifting frame.

Jack-Up System group photo

JS-Series

Capacity per Tower Model Number Maximum Sideload Base Frame Dimensions
(mm)
Barrel Dimensions
L x W x H
Weight
ton (kN) A B C D (mm) (kg)*
125 (1250) JS-125 3% @ 6m 1200 1100 990 1850 600x600x250 2200
250 (2500) JS-250 3.5% @ 10m 2250 2050 1475 3450 1150x1150x500 7500
500 (5000) JS-500 4% @ 15m 2800 2300 1700 4500 1700x1700x700 13.000
750 (7500) JS-750 5% @ 20m 3670 3250 2375 6100 2300x2300x1000 24.000

* Weight per jack-up unit, excluding barrels.

Capacity per Tower Model Number Maximum Sideload Base Frame Dimensions
(in)
Barrel Dimensions
L x W x H
Weight
(ton) (ft) A B C D (in) (lbs)*
140 JS-125 3% @ 20 47 43 39 73 24 x 24 x 10 4850
280 JS-250 3.5% @ 33 89 81 58 136 45 x 45 x 20 16,535
560 JS-500 4% @ 49 110 91 67 177 67 x 67 x 28 28,660
840 JS-750 5% @ 66 144 128 94 240 91 x 91 x 39 52,911

* Weight per jack-up unit, excluding barrels.

Extending the Height of a Container Crane with a Jack-Up System
The Jack-Up System allowed the crane’s lifting point to be kept as low as possible. Four brackets were added at each corner to provide the lifting points. The crane was lifted 6.5 metres, support wheels were slid underneath, and the crane was lowered down onto its support beams.

 

Construction of the Adriatic LNG Regasifier

Jack-Up System Lifts 1,500-ton Span on Fore River Bridge
The jack-up system’s frame contains four hydraulic cylinders in each corner, which lift and stack steel boxes to form lifting towers. The bridge span was lifted in increments as boxes were inserted via an automated system.

 

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