E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
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E02D 27/52 (2006.01) E02B 17/00 (2006.01) E02B 17/02 (2006.01)
Patent
CA 1098325
ABSTRACT A method and apparatus is disclosed for forming and maintaining an offshore ice structure in an Arctic environment. The structure is formed by a series of caissons oriented in a ring forming an enclosure capable of retaining a predetermined amount of water and thereby defining an ice island when frozen. The structure includes a passive heat extracting system which removes heat from the water within the enclosure and from the soil immediately below the enclosure and the caissons thereby advancing the freezing of the soil beneath the enclosure and water within the enclosure. In this manner, the lateral stability of the structure is improved by providing a single frozen mass of water and soil bonded in unitary construc- tion increasing the foundational base of the structure. In addition, refrigeration means are provided to prevent surface melting of the ice within the enclosure and preserve the integrity of the ice structure during warmer months. The island structure can, therefore, withstand greater lateral ice loads during the winter months and greater wave loads during the summer months and also provide a dry surface from which offshore opera- tions can be conducted year-round. -1-
325876
Jahns Hans O.
Maer Newton K.
Borden Ladner Gervais Llp
Exxon Production Research Company
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