Fixed Structures
Since the 1970s, several fixed concrete platform designs have been developed. Most of the designs have in common a base caisson (normally for storage of oil) and shafts penetrating the water surface to carry the topside. In the shafts normally utility systems for offloading, drilling, draw down and ballast are put up.
Concrete offshore platforms of the gravity-base type are almost always constructed in their vertical attitude. This allows the inshore installation of deck girders and equipment and the later transport of the whole structure to the installation site.
The most common concrete designs are:
- Condeep (with one, two, three or four columns)
- ANDOC (with four columns)
- Sea Tank (with two or four columns)
- C G Doris
- Arup Concrete Gravity Substructure (CGS)
Read more about this topic: Offshore Concrete Structure
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Thy soul, the fixed foot, makes no show
To move, but doth if th’ other do.”
—John Donne (1572–1631)
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