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Piles driven through the legs are generally welded to the jacket legs above the

sea level. These may also be grouted to the jacket leg providing rigidity and

composite action.

Skirt piles are grouted to the sleeves. Mechanical pile to sleeve connectors

may also be used.

Gravity foundations are seldom used, mostly for structures with high weight

(such as the concrete gravity platforms). These are feasible at locations where the

foundation soils are stable and non-consolidating (such as sand, gravel or highly

compacted clays), large footprints are possible, construction infrastructure (such as

graving docks and deep enough fjords) is available and geography permits (deep

fjords, deep and short towing depths).

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