Claims
- 1. A gravity base structure which can extend from a seabed to above seawater level and protect from iceberg impact the deck of an offshore platform having supporting columns extending from seabed to above seawater level, comprising
- a monolithic concrete caisson which includes a bottom slab adapted to rest on the seabed, a top slab spaced upwardly therefrom,
- an inner protective wall which extends between said bottom slab and said top slab and is integral with both said slabs,
- an outer protective wall which extends between said bottom slab and said top slab and is integral with both said slabs, said outer wall being substantially concentric with said inner wall, and
- a plurality of partition walls which extend between said bottom slab and said top slab and from said inner wall to said outer wall to form therebetween a lattice structure for transmitting impact energy from said outer wall to said inner wall,
- said deck supporting columns being substantially free of means for transmitting impact energy to said columns from said inner and outer protective walls other than that transmitted by said top and bottom slabs.
- 2. A gravity base structure as claimed in claim 1, wherein said inner and outer walls are formed of interconnected straight wall sections.
- 3. A gravity base structure as claimed in claim 1, wherein said inner and outer walls are cylindrical and coaxial with each other.
- 4. A gravity base structure as claimed in claim 1, wherein said caisson includes an intermediate slab located between said bottom and top slabs, said intermediate slab being integral with said inner and outer protective walls.
- 5. A gravity base structure as claimed in claim 1, wherein said lattice structure is comprises of generally triangular prisms.
Priority Claims (1)
Number |
Date |
Country |
Kind |
87 06711 |
May 1987 |
FRX |
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Parent Case Info
This application is a continuation of application Ser. No. 190,157, filed 5/4/88 now U.S. Pat. No. 4,906,138.
US Referenced Citations (6)
Number |
Name |
Date |
Kind |
3708987 |
Roulet et al. |
Jan 1973 |
|
4422804 |
Gerklick, Jr. et al. |
Dec 1983 |
|
4470725 |
Kure et al. |
Sep 1984 |
|
4478537 |
Birdy et al. |
Oct 1984 |
|
4504172 |
Clinton et al. |
Mar 1985 |
|
4576519 |
Mast et al. |
Mar 1986 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
190157 |
May 1988 |
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