Implements or apparatus for applying pushing or pulling force – Device or member for contacting and guiding moving cable – Including rotatable – cable contacting – pulley wheel element
Patent
1976-01-23
1977-08-16
Shapiro, Jacob
Implements or apparatus for applying pushing or pulling force
Device or member for contacting and guiding moving cable
Including rotatable, cable contacting, pulley wheel element
61 93, 254 89H, 254105, E02B 1704, B66F 100
Patent
active
040417115
ABSTRACT:
Method and apparatus for elevating an off-shore well drilling or other platform on a support structure in a minimum of time with maximum safety. The platforms are elevated on one or more caissons, utilizing one or more jacking units.
One type of support structure comprises three caissons arranged as a tripod. The platform to be mounted thereon has three open caisson wells and is floated into position, with one caisson received in each well. A caisson locking gate is closed to hold the platform in place. A pre-set-up jacking unit is located near or straddles each caisson well. Each jacking unit includes a jacking head, one or more jacking legs pivotally connected at their upper end to the jacking head, and a jacking mechanism surrounding each jacking leg and connected by a gimbal joint at its lower end to the platform. A stabilizing frame for each jacking unit is mounted on the platform. Trolleys mounted on the opposite sides of the frame, pulleys and tensioned cables initially hold the jacking head centered in the frame. Additional cables hold the jacking head suspended above the upper end of its associated caisson, ready to be lowered onto the caisson to immediately commence the platform hoisting operation.
REFERENCES:
patent: 3001592 (1961-09-01), Lucas
patent: 3429127 (1969-02-01), Donkers
patent: 3524322 (1970-08-01), Pogonowski
patent: 3556480 (1971-01-01), Johansson
patent: 3833118 (1958-05-01), Nixon
Marine Engineering Co., C.A.
Shapiro Jacob
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