US3830176A - Semi-submerged marine platform structure - Google Patents

Semi-submerged marine platform structure Download PDF

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Publication number
US3830176A
US3830176A US00367407A US36740773A US3830176A US 3830176 A US3830176 A US 3830176A US 00367407 A US00367407 A US 00367407A US 36740773 A US36740773 A US 36740773A US 3830176 A US3830176 A US 3830176A
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US
United States
Prior art keywords
columns
lower hulls
platform structure
semi
central
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00367407A
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English (en)
Inventor
Y Arita
K Ninomiya
E Miwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
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Publication of US3830176A publication Critical patent/US3830176A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B2001/128—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising underwater connectors between the hulls

Definitions

  • a semi-submerged platform structure to be used for workings at sea comprising a pair of relatively short central lower hulls arranged in alignment with and spaced apart from each other, a pair of relatively long side lower hulls arranged each on each side of the row of said central lower hulls in parallel and in symmetrical relation with respect thereto, six upright columns respectively provided on said central and side lower hulls such that said columns occupy the vertices of a regular hexagonal shape respectively, a working platform supported by said columns and structural members interconnecting said lower hulls, columns and working platform.
  • This invention relates to a semi-submerged platform structure to be used for workings at sea, and more particularly to such a semi-submerged platform structure which has improved stability gainst capsize upon casual failure of the structural members caused by collision against floating obstacles such as ice drifts or other reasons, while maintaining its excellent manoeuvability and transport characteristic at sea.
  • FIGS. 1 and 2 there has been proposed a three-leg semi-submerged platform structure which, as shown in FIGS. 1 and 2, comprises three footings a as the main buoyant members, columns b mounted on said footings a respectively for securing the stability of the platform structure, a working platform supported by said columns b and bracings d interconnecting said columns b.
  • This prior art platform structure is defective in that, when the joints e of the bracings d and columns b have once been broken by the shocks given by ice drifts or other floating obstacles, the platform structure can not longer maintain its stability and overturns.
  • FIGS. 3 and 4 A two-lower hull type semi-submerged platform structure which has been developed in the past'and is shown in FIGS. 3 and 4 comprises a pair of parallel lower hulls f, f, a group of upright columns g provided on each lower hull f, a working platform h supported by said columns g and bracings i interconnecting said columns g and working platform h.
  • This prior art platform structure is advantageous in that the two rope resistance is small and therefore, the structure has excellent transport characteristic, but is unsatisfactory in that it is poor in balancing characteristic and especially the structure involves the danger of capsize when cracks occurring in one of the lower hulls grow and the bilged compartments of said hull increases.
  • the present invention consists in a semi-submerged platform structure to be used for workings at sea, which is free of such disadvantages of the prior art structures as described above and which comprises a pair of relatively short central lower hulls arranged in alignment with and spaced from each other, a pair of relatively long side lower hulls arranged on both sides of said.
  • the object of the present invention is to provide an improved semi-submerged platform structure to be used for workings at sea which has improved stability against capsize upon casual failure of the structural members caused by collision against floating obstacles such as ice drifts or other reasons, while maintaining its excellent manoeuvability and transport characteristic at sea.
  • the working platform is supported by six columns, so that even when one of the six columns is broken by the shocks given thereto by floating obstacles such as ice drifts, the structure is capable of maintaining its stability with the remaining five columns and does not overturn.
  • the marine platform structure of the present invention comprises four lower hulls on which the columns are respectively mounted, and of these lower hulls, the two relatively short central lower hulls are arranged on a straight line passing the center of the platform structure in spaced relation and the remaining two relatively long side lower hulls arearranged on both sides of said aligned central lower hulls in parallel and in symmetrical relation thereto.
  • the six columns extending upright from the lower hulls respectively are arranged such that they occupy the vertices of a regular hexagonal shape. Therefore, the platform structure is symmetrical with respect to the center thereof and well resistive to external forces applied thereto in any direction.
  • Such arrangement of the structural members of the platform structure, plus the effects of the six columns renders the structure highly safe against shocks given by floating obstacles and sufficiently usable even in the regions of sea jammed with ice drifts.
  • the platform structure of the present invention has excellent manoeuvability and towing characteristic in the waves as the four lower hulls are arranged substantially in three rows, the two outer rows of lower hulls being arranged symmetrically with respect to one central row of lower hulls.
  • the semisubmerged marine platform structure of the invention is designed so as to ensure the safety thereof against destruction caused by collision with floatingobstacles such as ice drifts, without impairing the manoeuvability and transport characteristic which are the basic features of this type of marine platform structure, and is adapted for use as a platform structure for undersea oil-well drilling, marine public works or marine plants.
  • FIGS. 1 and 2 respectively are a plan view and a side view of a prior art three-leg semi-submerged marine platform structure
  • FIGS. 3 and 4 respectively are a plan view and a side view of a prior art two-lower hull type semi-submerged marine platform structure
  • the platform structure of the invention includes a pair of relatively short central lower hulls 1a and a pair of relatively long side lower hulls 1b.
  • the relatively short central lower hulls 1a, 1a are arranged with their longitudinal axes lying on a straight line passing the center of the platform structure and are spaced from each other, while the relatively long side lower hulls lb, 1b are arranged on each side of the row of said central lower hulls la, la in symmetrical relation with respect thereto, with their longitudinal axes extending parallel to said straight line.
  • the four lower hulls are arranged in three rows substantially parallel to each other, so as to enhance the transport or towing characteristic of the platform structure.
  • the opposite ends of each of the lower hulls are shaped in a semicircular shape as viewed from the upper side, so as to minimize the tow rope resistance and thereby enhancing the towing characteristic of the platform structure.
  • the relatively short central lower hulls la, 1a are made in a size large enough to provide a buoyancy sufficient to support the total weight of the platform structure during towing of said structure.
  • Six columns 2 respectively are extended upwardly from the outer ends of the central lower hulls 1a, 1a and the opposite ends of each of the side lower hulls 1b, lb, the arrangement of said columns 2 being such that each column is positioned at each vertex of a regular hexagonal shape.
  • a working platform 3 is mounted on the top ends of the columns 2 to be supported thereby.
  • Each of the columns 2 is of a size necessary to secure the stability of the platform structure and is so designed as to minimize the sway of the platform structure in the waves.
  • the lower hulls 1a, lb and the working platform 3 are interconnected by vertical members 4, and columns 2 are suitably interconnected by horizontal bracings 5, and furthr, the columns 2 and the vertical members 4, and the vertical members, are suitably interconnected by horizontal bracings 6. Beneath the central portion of the working platform 3 is left open to provide a working space 7, and the vertical members 4 and horizontal bracings 5, 6 serve as structural members to increase the strength and rigidity of the platform structure.
  • the interiors of the lower hulls la, 1b and the columns 2 are respectively divided into water-tight compartments by sealing partition walls 8, 9, and these compartments are used as storage tanks for ballast, fresh water and fuel oil.
  • the sizes of the respective compartments are suitably selected in consideration of the degree of inclination of the platform structure in the event when water intrudes into the compartments.
  • the marine platform structure of the present invention may be provided in either a self-propelled type or non-self-propelled type.
  • propeller means 11 are disposed projectably in recessed portions 10 respectively formed in the lower side of the hulls la, lb. The propeller means 11 when not in use are retracted into the recessed portions 10 and completely concealed therein.
  • the marine platform structure of the construction described and illustrated herein travels on the sea by its own propelling force or by being towed by a towboat, while being held afloat on the sea by the buoyancy of the lower hulls la, lb which are then at a light draft level B shown in FIG. 6, and reaches the area where it is intended to be used.
  • the platform structure is anchored to the sea-bottom and lowered into the sea by lowering the lower hulls to the level A shown in FIG. 6 by introducing sea water into the ballast tanks. Then, the desired work is performed using the platform structure as a foothold which is held afloat with the columns 2 being in a semi-submerged state.
  • the platform structure may be set directly on the sea bottom where the sea is shallow in depth.
  • a semi-submerged platform structure to be used for workings at sea comprising a pair of relatively short central lower hulls arranged in alignment with and spaced apart from each other in a row, a pair of relatively long side lower hulls arranged each on each side of the row of said central lower hulls in parallel and in symmetrical relation with respect thereto, six upright columns respectively provided on said central and side lower hulls such that said columns occupy the vertices of a regular hexagonal shape respectively, a working platform supported by said columns and structural members interconnecting said lower hulls, columns and working platform.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Revetment (AREA)
US00367407A 1972-06-26 1973-06-06 Semi-submerged marine platform structure Expired - Lifetime US3830176A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47063191A JPS5218473B2 (enrdf_load_html_response) 1972-06-26 1972-06-26

Publications (1)

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US3830176A true US3830176A (en) 1974-08-20

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US00367407A Expired - Lifetime US3830176A (en) 1972-06-26 1973-06-06 Semi-submerged marine platform structure

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US (1) US3830176A (enrdf_load_html_response)
JP (1) JPS5218473B2 (enrdf_load_html_response)
GB (1) GB1387369A (enrdf_load_html_response)
NL (1) NL7308092A (enrdf_load_html_response)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224891A (en) * 1975-06-27 1980-09-30 Victor Rinaldi Semi-submersible vessel having a sealed closed chamber of truncated ovoid shape
US4436050A (en) 1980-10-23 1984-03-13 Gotaverken Arendal Ab Semi-submersible vessel
US4556008A (en) * 1981-06-22 1985-12-03 Adragem Limited Semi-submersible marine platform
US4753185A (en) * 1983-04-05 1988-06-28 Marvin Steve Worley Floating vessels
US4834014A (en) * 1986-03-11 1989-05-30 Fred Olsen Floating platform structure
US5279240A (en) * 1990-08-14 1994-01-18 Worley Marvin S Floating oil/gas production terminal
US6015245A (en) * 1997-09-08 2000-01-18 Frimm; Fernando C. Semisubmersible offshore vessel
CN111820164A (zh) * 2020-07-31 2020-10-27 深圳埃吉尔海洋科技有限公司 智能化新能源海洋牧场型深远海养殖综合体

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL170940C (nl) * 1977-01-20 1983-01-17 Varitrac Ag Stabilisatie-inrichting voor een kraanvaartuig met onderwaterrompen.
FR2541333A1 (fr) * 1983-02-21 1984-08-24 Fayren J Pont flottant perfectionne
GB2148203A (en) * 1983-10-25 1985-05-30 Central Oil & Gas Ltd Semi-submersible marine platform
JP7266447B2 (ja) * 2019-04-09 2023-04-28 三菱重工業株式会社 セミサブ浮体、及びセミサブ浮体を用いた風車の洋上設置方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154039A (en) * 1962-07-25 1964-10-27 Jersey Prod Res Co Stable floating foundation
US3271964A (en) * 1955-10-21 1966-09-13 Kerr Mc Gee Oil Ind Inc Method of operating a submersible barge for submarine operations
US3556033A (en) * 1969-08-01 1971-01-19 Inst Francais Du Petrole Semi-submersible floating structure with dynamic positioning
US3653349A (en) * 1970-05-18 1972-04-04 Ocean Drilling Exploration Self-propelled semi-submersible drilling rig

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271964A (en) * 1955-10-21 1966-09-13 Kerr Mc Gee Oil Ind Inc Method of operating a submersible barge for submarine operations
US3154039A (en) * 1962-07-25 1964-10-27 Jersey Prod Res Co Stable floating foundation
US3556033A (en) * 1969-08-01 1971-01-19 Inst Francais Du Petrole Semi-submersible floating structure with dynamic positioning
US3653349A (en) * 1970-05-18 1972-04-04 Ocean Drilling Exploration Self-propelled semi-submersible drilling rig

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224891A (en) * 1975-06-27 1980-09-30 Victor Rinaldi Semi-submersible vessel having a sealed closed chamber of truncated ovoid shape
US4436050A (en) 1980-10-23 1984-03-13 Gotaverken Arendal Ab Semi-submersible vessel
US4556008A (en) * 1981-06-22 1985-12-03 Adragem Limited Semi-submersible marine platform
US4753185A (en) * 1983-04-05 1988-06-28 Marvin Steve Worley Floating vessels
US4834014A (en) * 1986-03-11 1989-05-30 Fred Olsen Floating platform structure
US5279240A (en) * 1990-08-14 1994-01-18 Worley Marvin S Floating oil/gas production terminal
US6015245A (en) * 1997-09-08 2000-01-18 Frimm; Fernando C. Semisubmersible offshore vessel
CN111820164A (zh) * 2020-07-31 2020-10-27 深圳埃吉尔海洋科技有限公司 智能化新能源海洋牧场型深远海养殖综合体
CN111820164B (zh) * 2020-07-31 2023-08-08 深圳埃吉尔海洋科技有限公司 智能化新能源海洋牧场型深远海养殖综合体

Also Published As

Publication number Publication date
GB1387369A (en) 1975-03-19
NL7308092A (enrdf_load_html_response) 1973-12-28
JPS5218473B2 (enrdf_load_html_response) 1977-05-21
JPS4921889A (enrdf_load_html_response) 1974-02-26

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