Active hold down system for jack-up drilling unit

Details Active hold down system for jack-up drilling unit Active hold down system for jack-up drilling unit

2006-02-14

2006-02-14

Lagman, Frederick L. (Department: 3673)

Hydraulic and earth engineering

Marine structure or fabrication thereof

With horizontally movable work deck

Reexamination Certificate

active

06997647

ABSTRACT:
A cantilever beam of a jack-up unit is provided with constant force restraining members mounted on a deck of a jack-up unit forward from conventional hold-down cantilever beam clamp. A modified cantilever beam end plate engages a first end of constant force restraining member, which may be a hydraulic cylinder, with the second end of the hydraulic cylinder secured to movable padeye, which is releasably secured to the deck of the jack-up unit. If desired a fixed foundation may be secured to the deck to reinforce the area of attachment of a padeye to the deck. To allow extension of the cantilever beam even farther to a drill well, an extension member may be attached to the end plate between a free end of the end plate and the hydraulic cylinders.

REFERENCES:
patent: 3477235 (1969-11-01), Hester, Jr. et al.
patent: 4823870 (1989-04-01), Sorokan
patent: 5052860 (1991-10-01), Ingle
patent: 5407302 (1995-04-01), Springett et al.
patent: 6171027 (2001-01-01), Blankestijin
patent: 6491477 (2002-12-01), Bennett et al.
patent: 6729804 (2004-05-01), Roodenburg et al.

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