OFFSHORE STRUCTURE, SUPPORTING MEMBER, SKID SHOE, METHOD FOR MOVING A CANTILEVER
First Claim
1. An offshore structure comprising:
- a platform, having a deck with an X-direction corresponding to a centerline of the platform;
a cantilever mountable on the deck and movable with respect to the deck of the platform;
a skidding system that is arranged for supporting and moving the cantilever with respect to the deck, wherein the skidding system is arranged for translational movement of the cantilever along a longitudinal direction of the cantilever and for rotational movement of the cantilever around a vertical rotation axis;
such that the cantilever is movable between a retracted position in which it substantially is above the deck, and an extended position in which it is substantially extended outside of the deck;
wherein the skidding system comprises;
a pair of longitudinal cantilever rails mounted to a bottom side of the cantilever, anda rotating system arranged to support and allow rotation of the cantilever with respect to the deck around the vertical axis;
a supporting system arranged to support the cantilever on the deck mounted at a distance from the rotating system along the X-direction;
supporting members arranged to engage the longitudinal cantilever rails with the rotating system or the supporting system;
wherein the supporting system comprises at least one deck rail arranged in a Y-direction substantially transverse to the X-direction;
and wherein the rotating system comprises at least two deck rails mounted in symmetrical fashion with respect to the X-direction and having an angle with respect to the Y-direction.
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Accused Products
Abstract
Method for moving a cantilever with respect to a deck of an offshore structure in longitudinal and rotational direction, around a predetermined virtual vertical axis, without providing a fixed vertical rotation shaft, comprising providing an offshore structure with a cantilever movable with respect to a deck of the offshore structure, providing cantilever rails on the bottom side of the cantilever and providing a supporting member or a skid shoe to support the cantilever on the deck, wherein the supporting member or the skid shoe has a top part configured for allowing the cantilever rail to have an angle deviating from the centerline of the skid shoe during rotation of the cantilever.
11 Citations
28 Claims
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1. An offshore structure comprising:
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a platform, having a deck with an X-direction corresponding to a centerline of the platform; a cantilever mountable on the deck and movable with respect to the deck of the platform; a skidding system that is arranged for supporting and moving the cantilever with respect to the deck, wherein the skidding system is arranged for translational movement of the cantilever along a longitudinal direction of the cantilever and for rotational movement of the cantilever around a vertical rotation axis;
such that the cantilever is movable between a retracted position in which it substantially is above the deck, and an extended position in which it is substantially extended outside of the deck;wherein the skidding system comprises; a pair of longitudinal cantilever rails mounted to a bottom side of the cantilever, and a rotating system arranged to support and allow rotation of the cantilever with respect to the deck around the vertical axis; a supporting system arranged to support the cantilever on the deck mounted at a distance from the rotating system along the X-direction; supporting members arranged to engage the longitudinal cantilever rails with the rotating system or the supporting system; wherein the supporting system comprises at least one deck rail arranged in a Y-direction substantially transverse to the X-direction; and wherein the rotating system comprises at least two deck rails mounted in symmetrical fashion with respect to the X-direction and having an angle with respect to the Y-direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An offshore system comprising:
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a platform having a deck; a cantilever mountable on the deck and movable with respect to the deck of the platform; a skidding system that is arranged for supporting and moving the cantilever with respect to the deck, wherein the skidding system is arranged for translational movement of the cantilever along a longitudinal direction of the cantilever and for rotational movement of the cantilever around a vertical rotation axis, such that the cantilever is movable between a retracted position in which it substantially is above the deck, and an extended position in which it is substantially extended outside of the deck; wherein the skidding system comprises a pair of longitudinal cantilever rails mounted to a bottom side of the cantilever, and at least a pair of skid shoes mountable on the deck, wherein a top part of a skid shoe is arranged to receive and guide a cantilever rail; wherein the top part of the skid shoe is configured to allow the cantilever rail to have an angle deviating from a centerline of the skid shoe during rotation of the cantilever. - View Dependent Claims (16, 17, 18, 19, 20)
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- 21. A supporting member comprising a bottom part arranged to engage a deck rail and a top part arranged to engage a cantilever rail, wherein the top part and/or the bottom part are configured to allow rotational movement of the rail to which it is engaged during rotation of the cantilever rail with respect to the deck rail.
- 26. A skid shoe comprising a bottom part arranged for fixedly mounting on a deck, and a top part arranged to engage a cantilever rail, wherein the top part of the skid shoe is configured to allow the cantilever rail to have an angle deviating from a centerline of the skid shoe.
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28. A method for moving a cantilever with respect to a deck of an offshore structure in longitudinal and rotational directions, around a predetermined virtual vertical axis, without providing a fixed vertical rotation shaft, comprising:
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providing an offshore structure with a cantilever movable with respect to a deck of the offshore structure, providing cantilever rails on the bottom side of the cantilever, and providing a supporting member or a skid shoe to support the cantilever on the deck, wherein the supporting member or the skid shoe have a bottom part and/or a top part respectively, of which the bottom part and/or the top part of the supporting member or the top part of the skid shoe is configured to allow the cantilever rail or the deck rail to have an angle deviating from the centerline of bottom part and/or top part during rotation of the cantilever.
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Specification