Hydraulic and earth engineering – Marine structure or fabrication thereof
Patent
1997-06-19
2000-02-22
Bagnell, David
Hydraulic and earth engineering
Marine structure or fabrication thereof
405203, 4052231, 405224, 4052242, 175 7, 166354, 166367, E02B 1138, E02D 2300
Patent
active
060272864
ABSTRACT:
An offshore system is provided of the type that includes riser pipes (30) extending up from the seafloor (44) to a tall and narrow caisson (12) at the sea surface, with the caisson moored by mooring lines (34) extending to the seafloor and anchored thereat, which minimizes bending of the upper portion of the riser pipes when the caisson drifts in severe weather. Although the caisson has a Ballasted lower end and buoyant upper end to keep its axis (20) vertical, a device is provided for applying a horizontal force (54) to a location along the caisson that is vertically spaced from the upper ends of the mooring lines, to tilt the caisson so the axis of the caisson is parallel to portions (82) of the riser pipes lying immediately below the caisson. In one arrangement, a second set of mooring lines (60) is provided, that have upper ends coupled to second locations (64) along the caisson that are vertically spaced from the upper ends of the first mooring lines. Also, a motor driven device (70) is provided for pulling on selected ones of the lines to tilt the caisson. In another arrangement, largely horizontal force transmitting members (132) extend from a lower portion of the caisson to a location (136) along a single set of mooring lines (126). In still another system, thrusters (152, 154) are used to push at locations along the caisson to tilt it.
REFERENCES:
patent: 3111926 (1963-11-01), Shatto
patent: 3360810 (1968-01-01), Busking
patent: 3535883 (1970-10-01), Manning
patent: 3580207 (1971-05-01), Pangalila
patent: 3602174 (1971-08-01), Gorman
patent: 3712260 (1973-01-01), Mott et al.
patent: 3778854 (1973-12-01), Chow
patent: 4170186 (1979-10-01), Shaw
patent: 4280430 (1981-07-01), Wilson et al.
patent: 4576521 (1986-03-01), Conrad
patent: 4604961 (1986-08-01), Ortloff et al.
patent: 4666339 (1987-05-01), Pollack
patent: 4702321 (1987-10-01), Horton
patent: 4797033 (1989-01-01), Pollack
patent: 4802432 (1989-02-01), Poldervaart et al.
patent: 4906139 (1990-03-01), Chiu et al.
patent: 4936710 (1990-06-01), Petty et al.
patent: 5706897 (1998-01-01), Horton, III
Bagnell David
Imodco Inc.
Lee Jong-Suk
LandOfFree
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