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专利名称：Method and apparatus for constructing and
maintaining an offshore ice island
发明人：Hans O. Jahns,Newton K. Maer, Jr.申请号：US05/939538申请日：19780905公开号：US04187039A公开日：19800205
摘要：A method and apparatus is disclosed for forming and maintaining an offshoreice structure in an Arctic environment. The structure is formed by a series of caissonsoriented in a ring forming an enclosure capable of retaining a predetermined amount ofwater and thereby defining an ice island when frozen. The structure includes a passiveheat extracting system which removes heat from the water within the enclosure and fromthe 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 ofwater and soil bonded in unitary construction increasing the foundational base of thestructure. In addition, refrigeration means are provided to prevent surface melting of theice within the enclosure and preserve the integrity of the ice structure during warmermonths. The island structure can, therefore, withstand greater lateral ice loads duringthe winter months and greater wave loads during the summer months and also provide adry surface from which offshore operations can be conducted year-round.
申请人：EXXON PRODUCTION RESEARCH
代理人：Marc L. Delflache
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