Patent ID: 8425155
Filing Date: 2013-04-23
Classification: E02B

Abstract:
1. A jacking system for a leg of a jack-up platform, comprising: at least three independent yokes, each yoke being connected to a jack-up structure by at least one vertically arranged double acting actuator and being equipped with a leg engaging mechanism, which is configured to engage and disengage with a hole of the jack-up leg, in order to transfer a load from the jack-up platform to the leg; and an anti-rotation provision configured to prevent rotation of the leg relative to the platform, wherein said anti-rotation provision includes: wherein the plurality of vertical guidance pillars and rings are connected to the platform such that a sub-assembly including the vertical guidance pillars and rings is supported by the platform in a vertical direction and a tangential direction of the leg, but freely moveable in a radial direction with respect to a transverse cross-section of the leg, to prevent rotation of the leg when engaged by a leg engagement mechanism and permit the vertical guidance pillars to be horizontally guided by the leg.