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Structure-and-method-for-restraining-motion-of-a-marine-structure

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Structure and method for restraining motion of a marine structure

Details

Inventors: Petty, Terry D.; Chabot, Luc G.;
Assignee: Odeco, Inc. (New Orleans, LA)
Primary Examiner: Taylor; Dennis L.
Assistant Examiner:
Attorney, Agent or Firm: Doody; Stephen R.

A marine structure situated in a seabed having mooring means designed to provide resistance to the environmental forces acting on the structure. Weights are attached to the mooring means at a distance above the seabed so that the weights do not touch the seabed during normal operating conditions. When extreme environmental loads move the structure a certain distance leeward of its original locations, the weights on leeward mooring means contact the seabed, significantly and immediately increasing the restoring force provided by the mooring means.

DETAILED DESCRIPTION What is claimed is: 1.
A structure for restraining motion during environmental loading, comprising A marine structure situated in a body of water at a desired location above a seabed; Means for mooring the marine structure; and At least one weight attached to the mooring means at a distance above the seabed so that said weight does not touch the seabed when the marine structure is at its desired location, but does touch the seabed in response to movement of the marine structure laterally away from its desired location.
2.
A method for mooring a marine structure situated in a body of water at a desired location above a seabed, comprising the steps of: (a) Attaching mooring means from the structure to the seabed; and (b) Attaching at least one weight to the mooring means at a distance above the seabed so that the weight does not touch the seabed when the marine structure is at its desired location, but does touch the seabed in response to movement of the marine structure laterally away from its desired location.
3.
The structure of claim 1 including a plurality of weights, none of which touches the seabed when the marine structure is at its location, and wherein at least one of said weights touches the seabed in response to movement of the marine structure laterally away from its desired location.
4.
The structure of claim 1 wherein said weight touches the seabed in response to movement of the structure laterally a predetermined distanced away from its desired location.
5.
A structure for restraining motion during environmental loading, comprising: a marine structure situated in a body of water above a desired seabed site; means for mooring the marine structure so that lateral displacement of the marine structure away form the desired seabed site is limited to an allowable offset beyond which the marine structure may not move without unacceptable risk of damage; and at least one weight attached to the mooring means at a distance above the seabed such that the weight touches the seabed only in response to movement of the marine structure beyond said allowable offset

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