Ships – Displacement-type hull – Multiple hulls
Patent
1983-06-01
1985-12-03
Basinger, Sherman D.
Ships
Displacement-type hull
Multiple hulls
114258, 405209, 414137, B63B 2500
Patent
active
045560048
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a load lifting and transport device with adjustable buoyancy for operations at sea, said device consisting of two parallel groups of floats connected at one of their ends, each group comprising a horizontal float to which vertical floats are fixed by one of their ends, one end of one group being connected to one end of the other group by a horizontal float and distance elements. The invention likewise deals with a method of using said device.
Operations at sea, and particularly the construction or the maintenance of oil drilling platforms, necessitate powerful transport and lifting means employing barges and barge cranes, the limited capacities of which present problems demanding complex and onerous solutions.
French Pat. No. 2,474,992 describes a device with adjustable buoyancy permitting the lifting to considerable heights of loads beyond the capacity of the available barge cranes. The device assumes the shape of a U consisting of two parallel groups of floats connected at one of their ends by a float with horizontal axis and by partly demountable distance elements. The horizontal and vertical floats are ballastable. The vertical floats of one group are connected at their emergent end by distance elements forming a longitudinal beam. The load is placed between the two longitudinal beams, whilst the pumps and the command station are arranged on the distance elements forming a transverse beam at the end of the groups of floats.
Such a device is used, inter alia, for positioning decks on the columns, during the construction or the dismantling of platforms. Generally, the deck is brought up to the site on barges, from which it is taken by the device with adjustable buoyancy which is brought up above the columns on each side of the latter. After ballasting, the deck comes to rest upon the columns.
The device described, and incidentally any other lifting means, being applied to the edges of the deck or of the structural element, subjects the latter to forces which necessitate a reinforcement of the structure in order to prevent deformations. Generally, the structure of a deck is designed to rest on four or more points located within the perimeter of the deck, which transmit all the forces to the columns. The distribution of the bending moments in the structure of the deck corresponds approximately to that of a beam supported at two non-extreme points. In the case of lifting a fully equipped deck by its edges, the distribution of the bending moments corresponds to that of a beam supported at its ends. The realisation of a structure capable of fulfilling both conditions involves a not inconsiderable increase in production costs, due to the increase in the weight of the deck itself.
OBJECTS AND SUMMARY OF THE INVENTION
The invention has as its aim a lifting device with variable buoyancy, comprising supporting means for the fully equipped deck which do not necessitate any reinforcement of its structure, and a method of using said device.
With the foregoing and other objects, advantages and features of the invention that will become hereinafter apparent, the nature of the invention may be more clearly understood by reference to the following detailed description of the invention, the appended claims and to the several views illustrated in the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The explanations and drawings given below by way of example will permit the manner in which the invention may be performed to be understood.
FIG. 1 shows a longitudinal view of the device according to the invention.
FIG. 2 is a view in plan of the same device.
FIG. 3 is a view according to the section III--III of FIG. 1.
FIG. 4 is a view according to the section IV--IV of FIG. 1.
FIG. 5 is a view in plan and in partial section of a supporting beam.
FIG. 6 is a view in section according to VI--VI of FIG. 5.
FIG. 7 is a view according to VII of FIG. 6.
FIG. 8 is a view on a larger scale of the detail VIII of FIG. 6.
FIG. 9 is a view according to IX of FIG. 8.
FIG. 10
REFERENCES:
patent: 3078680 (1963-02-01), Wepsala
patent: 3391666 (1968-07-01), Schuller, Jr.
patent: 3731821 (1973-05-01), Wallis
patent: 3938847 (1976-02-01), Peyton
patent: 4285629 (1981-08-01), Elliston
Lamy Jacques E.
Serrano Francisco de Asis M.
Basinger Sherman D.
Compagnie Generale pour les Developpements Operationnels des Ric
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