Ships – Vessel raising and docking – Floating dry docks
Patent
1982-12-21
1985-04-09
Blix, Trygve M.
Ships
Vessel raising and docking
Floating dry docks
405 3, 114125, B63B 3542
Patent
active
045094462
ABSTRACT:
The present invention relates to a drydocking method and apparatus including a moment resisting arrangement for maintaining the drydocking device in a substantially horizontal plane while raising or lowering a vessel relative to a surface of a body of water. The drydocking device includes a submersible pontoon having a first side positioned adjacent to a single fixed structure and having an arrangement for selectively introducing air or water into at least one chamber within the pontoon for raising and lowering the pontoon, respectively. The pontoon has a moment resisting arrangement which includes a cable secured to the fixed structure and extending around a first sheave positioned adjacent to the first side of the pontoon. The cable extends across the pontoon and around a second sheave positioned adjacent to a second opposite side of the pontoon to an anchoring arrangement beneath the second side of the pontoon. The moment resisting arrangement also includes at least one permanent void tank and at least one permanent ballast tank positioned within the pontoon for creating an induced moment tending to rotate the first side of the pontoon downwardly. In operation, the induced moment resists external moments due to eccentrically positioned vessels which tend to rotate the second side downwardly, and the cable resists the induced moment and other external moments due to eccentrically positioned vessels which tend to rotate the first side downwardly.
REFERENCES:
patent: 979519 (1910-12-01), Larson
patent: 3559606 (1971-02-01), Gregory
patent: 3688719 (1972-09-01), Amirikian
patent: 3890915 (1975-06-01), Herreshoff
Blix Trygve M.
Marine Concepts, Inc.
Swinehart Edwin L.
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