Method for the building and putting in place of a sea platform with a gravity resting base, and means for implementing such a method
AssigneeCompagnie Generale pour les Developpements Operationnels des Richesses Sous-Marines
InventorHenri A. Marion
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for the building and putting in place of a sea platform in using buoyancy chambers. The buoyancy chambers are temporarily attached to the raft and capable of being ballasted for allowing the control of their buoyancy during the building of the structure and their recovery. Simultaneously with the building of the tower and walls, the chambers are progressively built by assembling of portions of bodies mounted on a bottom element resting on a chamber receptacle.
Claims10
A method for the building and putting in place of a sea platform with a gravity resting base comprising the following main steps:
- (a) building in dry dock of a foundation raft comprising a portion of anti-underwashing walls, circular and radial strengthening walls, buoyancy chamber receptacles and a base forming tower lower portion and water tightening the anti-underwashing walls;
- (b) launching the raft;
- (c) simultaneously building the walls, a tower and buoyancy chambers, said chambers being built progressively by assembling portions of bodies mounted on a bottom element resting on the chamber receptacle, said assembled portions having a buoyancy adapted to the progressive assembly;
- (d) ballasting the chamber receptacles during building of the tower and buoyancy chambers;
- (e) closing the upper ends of the buoyancy chambers;
- (f) completion of the tower, simultaneously with progressive ballasting thereof;
- (g) immersion of the platform by means of ballast;
- (h) putting in place of a bridge, and adjusting the draught;
- (i) towage to a selected location;
- (j) immersion of the platform by means of ballast;
- (k) putting in place of a module and ballasting the tower lower portion with solid ballast;
- and
- (l) disconnecting the buoyancy chamber and ballasting the chamber receptacles with solid ballast.
A method for the building and putting in place of a sea platform with a gravity resting base comprising the following main steps:
- (a) building in dry dock a foundation raft comprising a portion of anti-underwashing walls, circular and radial strengthening walls, buoyancy chamber receptacles and a base forming tower lower portion and water tightening the anti-underwashing walls;
- (b) launching the raft;
- (c) simultaneously building the walls, a tower and buoyancy chambers, said chambers being built progressively by assembling portions of bodies mounted on a bottom element resting on the chamber receptacle, said assembled portions having a buoyancy adapted to the progressive assembly;
- (d) ballasting the chamber receptacles during building of the tower and buoyancy chambers;
- (e) closing the upper ends of the buoyancy chambers;
- (f) completion of the tower, simultaneously with progressive ballasting thereof;
- (g) immersion of the platform by means of ballast;
- (h) putting in place of a bridge and adjusting the draught;
- (i) towage to the selected location;
- (j) immersion of the platform by means of ballast;
- (k) disconnecting the buoyancy chambers and ballasting the chamber receptacles with solid ballast;
- and
- (l) putting in place of a module and ballasting the tower lower portion with solid ballast.
A gravity platform comprising:
- a foundation raft having structural elements and adapted to reset on a sea floor;
- an anti-underwashing wall formed on the foundation raft;
- chamber receptacles forming a portion of the structural elements of the foundation raft, said receptacles being distributed according to a predetermined configuration;
- a central tower having a lower part, said tower being joined to the foundation raft and chamber receptacles by means of diaphragm walls;
- buoyancy chambers removably mounted on the chamber receptacles, the buoyancy chambers being removable from the raft and recoverable, leaving the raft disposed on the sea floor, said buoyancy chambers formed of prefabricated elements adapted to be connected together;
- and
- means for connecting the buoyancy chambers to the chamber receptacles in a watertight manner.
Dependencies are inferred from the claim text.