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Method and apparatus for protecting offshore structures against forces from moving ice sheets

  • US 4,102,144 A
  • Filed: 05/31/1977
  • Issued: 07/25/1978
  • Est. Priority Date: 05/31/1977
  • Status: Expired due to Term
First Claim
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1. A method for protecting a marine structure fixed in a body of water from forces exerted by sheet ice moving across the water surface comprising the steps of:

  • placing adjacent the marine structure a shield surface which slopes away from the structure in a direction opposite to the direction of ice movement from the structure proceeding from an upper portion above the water surface to a lower portion disposed below the water surface,allowing a portion of the sheet ice to move substantially into contact with the shield surface so that a submerged portion of the shield surface is disposed below the ice,raising the shield surface to an elevated position thereof to cause the surface to lift the ice and to break pieces therefrom, andmoving the shield surface in the elevated position thereof to a position thereof downstream from the marine structure relative to the direction of ice movement.

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