Hydraulic and earth engineering – Marine structure or fabrication thereof – With work deck vertically adjustable relative to floor
Patent
1985-01-11
1987-04-14
Corbin, David H.
Hydraulic and earth engineering
Marine structure or fabrication thereof
With work deck vertically adjustable relative to floor
405196, E02B 1708
Patent
active
046574379
ABSTRACT:
A leg support system for mobile, marine, jackup units of the type having a floating barge having telescoping legs upon which the barge can self-elevate. The jack towers are movably positioned on the vessel deck and are adapted to tilt into variable angles so that the legs can be spread wider apart when they rest on the bottom of the ocean. The bottom of the legs are fitted with a foot (can). With the cans further apart and the legs inclined to preselected variable angles, the stability against overturning is increased, and leg bending moments are reduced during all conditions; including storms, transit, drilling and "punch through." Because of this adjustable leg inclination feature, the tilted legs inboard chords can be connected to adjacent chords at the top of the legs during transit conditions, thereby reducing the leg stresses. The jack tower guidance system consists of upper and lower guide rollers which contact the specially shaped chord sections and support the legs as they are extended or retracted by the elevating jacks. Each jack tower positioning system consists of a pair of hinges on the sides of the respective legs, facing the center of the jackup barge unit, and a yoke tower is located on the side of each leg away from the center of the unit. The elevating mechanism in the yoke tower can selectively raise or lower the outboard edge of the jack tower, which in turn moves the leg's can in or out from the center of the unit. The hinges provide fixation in all directions except translation normal to the axis of the hinges. This system with the rigid frame provides fixation between the jack tower and the hull of the unit.
REFERENCES:
patent: 3171259 (1965-03-01), Roussel
patent: 3367119 (1968-02-01), Rybicki
patent: 3402557 (1968-09-01), Steele
patent: 3750210 (1973-08-01), Barnard et al.
patent: 4437792 (1984-03-01), Durand
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