Marine platform jacket jack
AssigneeVarco International, Inc.
InventorPadmasiri D. Seneviratne
Life of this patent
Estimating the term…
Abstract
A jacking mechanism for leveling a marine platform and a jacket supporting the platform by elevating a tubular leg or member of the platform relative to a pile extending through that member, with the jacking mechanism including a first gripping unit adapted to extend about and releasably grip the tubular member, a second gripping unit adapted to extend about and releasably grip the pile at a location beyond the tubular member and at a diameter smaller than the diameter at which the first gripping unit engages the tubular member, and power actuated means for moving the two gripping units axially relative to one another to cause the desired relative displacement of the leg and pile.
Claims18
A jack for moving a tubular first member and a second member extending therethrough relative to one another, comprising:
- a first gripping unit adapted to extend about said tubular first member and actuable between an active condition in which it grips an outer surface of said first member to apply jacking force thereto in a first axial direction and a released condition permitting movement of the gripping unit relative to said first member in said axial direction;
- a second gripping unit adapted to extend about said second member axially beyond said first member and actuable between an active gripping condition in which it grips an outer surface of said second member smaller in diameter than said outer surface of the first member in a relation to apply jacking force thereto in said second axial direction and a released condition permitting movement of the second gripping unit relative to said second member in said second axial direction;
- and
- power actuated means for moving said gripping units axially relative to one another in a direction applying force from said first gripping unit to said tubular member in said first axial direction and applying force from said second gripping unit to second member in said second axial direction to jack the members axially relative to one another.
A marine platform jacket jack for raising a tubular member forming a portion of a jacket relative to a pile extending through the member, comprising:
- a first gripping unit adapted to extend about said tubular member and actuable between an active condition in which it grips an outer surface of said member to apply upward jacking force from said gripping unit to said member and a released condition permitting upward movement of the gripping unit relative to said member;
- a second gripping unit adapted to extend about said pile above said tubular member and actuable between an active condition in which it grips an outer surface of the pile smaller in diameter than said outer surface of said member in a relation preventing downward movement of the second gripping unit relative to the pile and a released condition permitting such movement;
- and
- power actuated means for moving said first gripping unit upwardly relative to said second gripping unit to jack said tubular member upwardly relative to the pile.
A marine platform jacket jack for raising a tubular member forming a position of a jacket relative to a pile extending through the member, comprising:
- a first gripping unit adapted to extend about said tubular member and including a slip bowl structure having a downwardly tapering camming surface, downwardly tapering slips engageable with said bowl structure to grip an outer surface of said tubular member, and power actuated means for moving said slips relative to said slip bowl structure between an active position in which the slips grip an outer surface of said tubular member to apply upward jacking force thereto and a released position permitting upward movement of said gripping unit relative to said tubular member;
- a second gripping unit adapted to extend about said pile above said tubular member and including a slip bowl structure having an upwardly tapering camming surface, upwardly tapering slips engageable with said slip bowl structure to grip an outer surface of the pile smaller in diameter than said outer surface of said tubular member, and power actuated means for moving said slips of the second gripping unit relative to said bowl structure thereof between active positions in which the slips grip said outer surface of the pile in a relation preventing downward movement of the second gripping unit relative to the pile and a released position permitting such movement;
- and
- fluid pressure operated piston and cylinder means for moving the slip bowl structure of said first gripping unit upwardly relative to the slip bowl structure of said second gripping unit to jack said tubular member upwardly relative to the pile.
Dependencies are inferred from the claim text.