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  3. Jack-Up Legs & Spud Cans
Offshore · Marine construction

Jack-Up Legs & Spud Cans

Cylindrical jack-up legs rolled from thick plate, with pin holes on a set pitch, splices between sections and a spud can at the foot, fabricated to the barge designer’s drawings.

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Allmarc 3D model · to scale
Explore the model

How it is built.

Scroll: the camera moves to each part in turn and ends on the exploded view. Drag to turn it round yourself.

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01 / 07

A leg, as it leaves the works

One leg standing on its spud can and two more sections on trestles. Diameter, length and hole pitch follow the barge design.

Scroll to see how it is built · drag to turn it round

02 / 07

Rolled sections

Thick plate rolled into cans, seam-welded and joined into sections, then checked for straightness along their length.

How is it possible at Allmarc?
Three-roll pinch cum pyramid plate rolls in the Allmarc works

Used here for: Rolled sections

  • Rolls plate up to 40 mm
All our machinery

Used here for: Rolled sections

  • Full-penetration welds on built-up sections
All our machinery

03 / 07

Pin holes

Holes cut to jig on a set pitch, each with a reinforcing ring: the pins carry the whole barge through them.

How is it possible at Allmarc?

Used here for: Pin holes

In 2024 we were the only buyer of Deratech’s 20 kW, 12 m laser.

  • 20 kW
  • 12 x 3 m bed
  • Pallet changer
All our machinery

04 / 07

Splices

Splice rings and backing bars where sections join.

05 / 07

Spud can

The conical footing that spreads the load into the seabed.

06 / 07

Leg top

Top ring and padeyes for lifting the leg into its well.

07 / 07

A kit of parts

Sections, holes, splices and can: every member numbered, match-marked and packed in erection sequence.

From our works

In our works: leg and jack-house base

A rolled leg section standing on its jack-house base: two ring decks with radial stiffeners, set up on a levelled plate so everything is square before welding.

A jack-up leg section standing on a stiffened ring base in the Allmarc works
From our works

In our works: leg well and guides

A ring deck for a leg well and a leg section with longitudinal stiffeners, under the 30 m bay cranes.

A leg-well ring deck and a stiffened leg section in the Allmarc works
Photos

In our works, and at sea.

A leg can on rotators, and its profile-cut stiffenersVideo
Leg sections, yokes and jacking brackets in the bayVideo
Why Allmarc

Experience you can trust.

We fabricate to your drawings and prove the fit in our own bay before anything ships. Open any line for the detail.

Talk to an engineer
Heavy rolled plate
  • Leg sections and yoke rings rolled from thick plate.
  • Seams welded on the submerged-arc line.
Round and true
  • Rings braced round while they are welded out.
  • Pin holes cut and checked to jig.
Fitted in the works
  • Yokes, guides and leg sections fitted together before dispatch.
  • A 30 m wide bay with 11.5 m under the hook.
To the designer’s drawings
  • Hydraulics, winches and cranes come from their makers.
  • We build the steel they work in.
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We fabricate to your design, from plate to a packed container. An engineer will tell you honestly how we would build it.

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