Extendable draft platform with buoyancy column strakes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B63B-035/44
E02B-017/08
E02B-017/00
출원번호
US-0238178
(2005-09-28)
등록번호
US-7467912
(2008-12-23)
발명자
/ 주소
Murray,John
출원인 / 주소
Technip France
대리인 / 주소
Klein, O'Neill & Singh, LLP
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
In an Extendable Draft Platform including a deck, a plurality of buoyancy columns installed in column wells in the deck for movement from a raised position to a submerged position, and a heave plate on the bottom of the columns, each of the columns has an upper portion and a lower portion. A helical
In an Extendable Draft Platform including a deck, a plurality of buoyancy columns installed in column wells in the deck for movement from a raised position to a submerged position, and a heave plate on the bottom of the columns, each of the columns has an upper portion and a lower portion. A helical strake having a radial height H is fixed to the lower portion of each column. The maximum width of the lower column portion is less than the maximum width of the upper column portion by at least 2H, so that the strake can pass through a column well having maximum width that is only slightly greater than that of the upper column portion. A plurality of guide rails is fixed to the lower portion of each column, each extending along the outer periphery of the strake from the upper column portion to the heave plate.
대표청구항▼
What is claimed is: 1. An Extendable Draft Platform (EDP), of the type including a deck and a plurality of buoyancy columns installed in column wells in the deck for vertical movement from a raised position to a submerged position, wherein each of the columns comprises: an upper portion having a fi
What is claimed is: 1. An Extendable Draft Platform (EDP), of the type including a deck and a plurality of buoyancy columns installed in column wells in the deck for vertical movement from a raised position to a submerged position, wherein each of the columns comprises: an upper portion having a first maximum width; a lower portion having a second maximum width; and a helical strake on the lower portion, the helical strake having a radial height H, wherein the second maximum width is less than the first maximum width by at least 2H. 2. The EDP of claim 1, wherein the second maximum width is less than the first width by approximately 2H. 3. The EDP of claim 1, wherein the upper and lower column portions are substantially cylindrical, wherein the first maximum width is a first maximum diameter, and wherein the second maximum width is a second maximum diameter. 4. The EDP of claim 1, wherein each of the columns includes a transitional portion between the upper portion and the lower portion, the transitional portion having a width that varies from the first maximum width at a first juncture with the upper column portion to the second maximum width at a second juncture with the lower column portion. 5. The EDP of claim 4, wherein the strake has an outer periphery, and wherein each of the columns further comprises a plurality of longitudinal guide rails on the lower column portion, each of the guide rails extending downwardly along the outer periphery of the strake from the first juncture. 6. The EDP of claim 5, wherein each of the columns has a bottom end fixed to a heave plate, and wherein each of the guide rails has a lower end fixed to the heave plate. 7. The EDP of claim 1, wherein the strake has an outer periphery, and wherein each of the columns further comprises a plurality of longitudinal guide rails fixed to the lower column portion, each of the guide rails extending downwardly along the outer periphery of the strake from the upper column portion. 8. The EDP of claim 7, wherein each of the columns has a bottom end fixed to a heave plate, and wherein each of the guide rails has a lower end fixed to the heave plate. 9. The EDP of claim 7, wherein each of the guide rails is attached to the lower column portion by a plurality of radial support elements. 10. The EDP of claim 7, wherein each column comprises four guide rails fixed to the lower column portion, the guide rails being located at 90�� intervals. 11. An Extendable Draft Platform (EDP), of the type including a deck and a plurality of buoyancy columns installed in column wells in the deck for vertical movement from a raised position to a submerged position, wherein each of the columns has a bottom end fixed to a heave plate, characterized in that each of the columns comprises: an upper portion having a first maximum width; a lower portion having a second maximum width; a helical strake on the lower portion, the helical strake having an outer periphery and a radial height H, wherein the second maximum width is less than the first maximum width by at least 2H; and a plurality of longitudinal guide rails fixed to the lower column portion, each of the guide rails extending downwardly along the outer periphery of the strake from the upper column portion to the heave plate. 12. The EDP of claim 11, wherein each of the columns is further characterized by a transitional portion between the upper portion and the lower portion, the transitional portion having a width that varies from the first maximum width at a first juncture with the upper column portion to the second maximum width at a second juncture with the lower column portion. 13. The EDP of claim 12, wherein each of the guide rails extends downwardly from the first juncture to the heave plate. 14. The EDP of claim 11, wherein each of the guide rails is attached to the column lower portion by a plurality of radial support elements. 15. The EDP of claim 11, wherein the second maximum width is less than the first width by approximately 2H. 16. The EDP of claim 11, wherein the upper and lower column portions are substantially cylindrical, wherein the first maximum width is a first maximum diameter, and wherein the second maximum width is a second maximum diameter. 17. An Extendable Draft Platform (EDP), comprising: a deck including a plurality of column wells; a buoyancy column installed in each of the column wells for vertical movement from a raised position to a submerged position, wherein each of the columns has an upper portion having a first maximum width, a lower portion having a second maximum width, and a bottom end; a heave plate fixed to the bottom ends of the columns; a helical strake on the lower portion, the helical strake having an outer periphery and a radial height H; and a plurality of longitudinal guide rails fixed to the lower portion of each column by a plurality of radial support elements, each of the guide rails extending downwardly along the outer periphery of the strake from the upper portion of the column to the heave plate; wherein the second maximum width is less than the first maximum width by at least 2H. 18. The EDP of claim 17, wherein each of the columns further comprises a transitional portion between the upper portion and the lower portion, the transitional portion having a width that varies from the first maximum width at a first juncture with the upper column portion to the second maximum width at a second juncture with the lower column portion. 19. The EDP of claim 18, wherein each of the guide rails extends downwardly from the first juncture to the heave plate. 20. The EDP of claim 17, wherein the upper and lower column portions are substantially cylindrical, wherein the first maximum width is a first maximum diameter, and wherein the second maximum width is a second maximum diameter.
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이 특허에 인용된 특허 (7)
Horton, Edward E, Cellular spar apparatus and method.
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