US3894503A - Method for converting a floatable barge into a semi-submersible vessel - Google Patents

Method for converting a floatable barge into a semi-submersible vessel Download PDF

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Publication number
US3894503A
US3894503A US348594A US34859473A US3894503A US 3894503 A US3894503 A US 3894503A US 348594 A US348594 A US 348594A US 34859473 A US34859473 A US 34859473A US 3894503 A US3894503 A US 3894503A
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Prior art keywords
barge
columns
submersible
water
starboard
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US348594A
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English (en)
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Alan C Mcclure
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Brown and Root Inc
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Brown and Root Inc
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Priority to US348594A priority Critical patent/US3894503A/en
Priority to GB1318474A priority patent/GB1438916A/en
Priority to CA196,345A priority patent/CA990588A/en
Priority to AU67416/74A priority patent/AU472884B2/en
Priority to NL7404577A priority patent/NL7404577A/xx
Priority to DE2416357A priority patent/DE2416357A1/de
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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 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/04—Cable-laying vessels

Definitions

  • ABSTRACT Methods and apparatus are provided for converting a floatable barge into a semi-submersible vessel.
  • An independently floatable cradle unit is provided which has at least two submersible hulls, a plurality of support columns, transverse braces, and a buoyancy mechanism for selectively ballasting'and de-ballasting the submersible hulls.
  • the cradle unit is sunk or at least partially submerged and a barge is floated there above, whereupon the cradle is raised to lift the barge from the water.
  • the barge is rigidly connected to the upper portions of the support columns.
  • An inclined lay ramp and/or derrick may be mounted on the era die to convert the barge into a semi-submersible lay or derrick vessel.
  • Vessels having hull configurations which are characterized by large water plane areas, such as conventional floating barges, for example, are subjected to excessive motion in heave, pitch, and roll directions during rough sea conditions. Consequently, vessels such as these might encounter substantial difficulties during the performance of operations such as pipeline laying, ship to ship material transfer, hoisting operations, platform erection, and other operations which require steady working decks. The dangers produced by such unstable conditions can threaten the safety of the crew as well as result in costly delay.
  • Vessels of the semi-submersible type typically exhibit a high degree of stability and thus are being widely employed in rough waters.
  • Semisubmersible vessels typically utilize a pair of buoyant hulls connected below a working platform by means of vertically disposed support columns.
  • the buoyancy of the hulls may be varied to enable the working platform to be selectively raised and lowered in relation to the water surface. In this manner, the buoyant hulls can be submerged to a position below the water surface while maintaining the working platform above the water surface at a higher level than the maximum expected wave heights.
  • a floatable barge is converted into a semi-submersible vessel.
  • a cradle unit which has a pair, or more, of preferably parallel submersible hull members, a plurality of columns extending transversely upwardly from each hull, transverse bracing structures preferably interconnecting columns of one hull with opposing columns of the other hull, and a buoyancy mechanism for selectively ballasting and de-ballasting the hull members.
  • the buoyancy mechanism is actuated to cause the cradle unit to sink, at least partially in a body of water, such that the hulls are submerged, the bracing structures define support surface means which may be horizontal and be disposed below the water surface, and the opposing columns define a barge-receiving zone therebetween.
  • the barge With the cradle thus disposed, the barge is floated on the body of water to a position adjacent the bargereceiving zone, with the underside of the barge located above the horizontal support surface means.
  • the buoyancy mechanism is then actuated to bring the horizontal support surface means into supporting contact with the underside of the barge and lift the barge from the surface of the body of water.
  • the bracing structures include a plurality of brace beams interconnecting opposing columns, and diagonal brace elements.
  • the buoyancy mechanism includes ballast pumping equipment in each hull which communicate by a conduit extending through a brace beam.
  • the barge and cradle are interconnected by extension frames. These frames may include upper surfaces which define extensions of the barge hull and working platforn. and may serve to support at least part of an offset rotary crane.
  • the barge may be floated to a position adjacent the barge-receiving zone, yet off-set from the center thereof.
  • An extension frame may be provided to serve as an auxiliary working deck.
  • the cradle may include an inclined or downwardly curved lay ramp which is suitable for the laying of an elongate flexible structure, such as pipeline, from the vessel.
  • the lay ramp may be supported by columns at one side of the cradle, the columns having rampsupporting portions of varying height in accordance with the ramp inclination.
  • the after-most column adjacent the ramp may be provided with a hitch mechanism for supporting a conventional stinger mechanism
  • FIG. 1 is a schematic sectional view of a barge conversion assembly taken along the line 2-2 in FIG. 2 with the tower portion removed, according to one preferred embodiment of the subject invention
  • FIG. 2 is a schematic side elevational view of the barge conversion assembly including the tower portion;
  • FIG. 3 is a schematic front elevational view of the barge assembly depicted in FIG. I;
  • FIG. 4 is a schematic front elevational view of another preferred barge conversion assembly according to the invention, with the tower portion removed;
  • FIG. 5 is a schematic front elevational view of a further preferred embodiment according to the invention, with derrick and tower portions removed;
  • FIG. 6 is a schematic sectional view of the barge conversion assembly taken along line 66 in FIG. 7;
  • FIG. 7 is a schematic side elevational view of the barge conversion assembly depicted in FIGS. 4 and 6, including the derrick and tower portions;
  • FIG. 8 is a schematic longitudinal cross-sectional view through a submersible buoyant hull member forming part of the barge conversion assembly of the invention.
  • FIG. 9 is a transverse sectional view through a support column, taken along the line 9-9 in FIG. 2', and
  • FIGS. 10 through 13 are schematic front elevantional views sequentially depicting various steps in the barge conversion operation of the present invention.
  • a barge conversion assembly comprising a conventional floatable barge and a buoyant cradle unit attachable thereto to form a semi-submersible vessel.
  • the barge conversion assembly is illustrated schematically in FIGS. 1, 2, and 3 and comprises a barge l0 and a buoyant cradle unit 12.
  • the barge 10 is a conventional floating derrick barge having front, rear, and side portions 16, I8, and 20 and a working deck or platform 22 carried thereby.
  • a conventional derrick or crane unit 24 Operably disposed on the working deck 22 is a conventional derrick or crane unit 24.
  • the crane includes a boom 25 which is rotatably mounted on a tub 26 that is secured to the deck 22. Only a tub portion of the crane is depicted in FIG. 1 to indicate the relative location thereof. In this connection, the rotational axis of the crane is arranged so as to intersect the centerline of the barge.
  • Located at the front of the barge is a control tower 28 from which various barge activities are directed.
  • the barge when in a floating condition, exhibits a relatively large water plane area, thereby rendering the barge highly sensitive to wave action.
  • motions of the barge in heave, pitch, and roll directions will tend to restrict the usefulness of the barge.
  • the cradle unit 12 includes twin submersible hulls, preferably in the form of buoyant caissons or pontoons 3UP and 308 which are oriented on port and starboard sides in parallel relationship.
  • the pontoons include ballast chambers and equipment for selectively ballasting and de-ballasting these chambers with sea water, as will be subsequently described.
  • each of the pontoons carries a plurality of support columns 32 and 34 which extend transversely relative to the longitudinal axes of the pontoons. While the preferred embodiment described in connection with FIGS. 1, 2, and 3 discloses three columns associated with each pontoon, it will be appreciated that any suitable number of columns may be employed.
  • Each bracing assembly includes a lower horizontal brace beam 36 and an upper horizontal brace beam 38 secured between oppositely disposed ones of the columns 32 and 34.
  • a plurality of diagonal brace members 40,41,42 and 43 preferably four in number, are secured at their upper ends to the upper brace beam 38.
  • the two inner diagonal braces 41 and 42 are connected at theirlower ends to the lower brace beam 36.
  • the two outer diagonal braces 40 and 43 are connected at their lower ends to the opposed support columns 32 and 34, respectively.
  • the cradle With the pontoons 30, the columns 32 and 34, and the bracing assemblies 35 in an assembled condition, the cradle constitutes a unitary floatable structure.
  • the columns 32, 34 are secured to the barge by means of steel frame extension structures 46 which are rigidly secured between the barge and the columns. In their assembled condition, the frame structures 46 define extensions of the barge hull.
  • each pontoon is provided with a pump room 48. Within the pump room are disposed a plurality of pumps 52 and 54 which are suitably connected, via appropriate piping and valve manifolds, between a sea chest 56 and a number of water-tight ballast chambers 58.
  • the pumps 52 and 54 are operable to regulate the transfer of sea water to the ballast chambers to alter the buoyancy of the pontoons.
  • the pump 54 is arranged to transfer ballast water from one pontoon to the other through a conduit 60 extending through the lower horizontal brace beam 36 of the intermediate bracing assembly. in this fashion, the pump mechanism of one pontoon may, if necessary, be utilized to control the buoyancy of both pontoons.
  • the control room of the control tower 28 is provided with a main ballast control console (not shown) for remotely operating the ballast pumps and their associated valves.
  • Auxiliary ballast controls are desirably disposed in the pontoon pump rooms and are capable of being operated independently of the main control console if such necessity arises.
  • the pontoons also include chambers 59 and 61 for the storage of fresh water and fuel, respectively. Suitable pumps may be provided for conducting this water and fuel to the barge. Such an arrangement tends to maximize usage of the barge storage facilities.
  • the intermediate ones 321 and 341 of the support columns include central tubes 62. These tubes provide shear strength across the columns and accommodate access to the pontoon pump rooms via appropriately arranged ladders.
  • the fore and aft support columns 32F, 32A, and 34F, 34A are also provided with central tubes to facilitate passage of piping between the barge and the pontoons.
  • the tubes are held in fixed relation within the col umns by means of fore-aft bulkheads 64 and transverse bulkheads 66.
  • CONVERSION OPERATION Conversion of a floating barge into a semisubmersible vessel in accordance with the invention is initiated by fabricating the cradle unit 12.
  • the pontoons S and 30F are constructed and are provided with stub portions 70 of the support columns 32 and 34.
  • the pontoons are then launched into a floating condition. While afloat, the pontoons are interconnected by installation of the lower horizontal brace members 36. The remaining portions of the support coluns 32 are then erected, defining a barge-receiving zone 72 therebetween. Installation is completed of the remainder of the transverse bracing assemblies 35F, 35A, and 35l, including the upper transverse brace beams 38 and the diagonal braces 40, 41, 42 and 43.
  • extension frames 46 are then welded onto the upper ends of the support columns.
  • the piping systems, machincry, and wiring are installed within the pontoons, support columns, and hull extension frames.
  • the cradle unit is then transported to a deep water location where the pontoons 30S and 30P are ballasted causing the cradle unit to sink to a depth sufficient to permit the barge 10 to be floated into the bargereceiving zone 72. With the barge 10 in position, the pontoons will be de-ballasted to raise the cradle unit and thus the brace beams 38 into engagement with the underside of the barge (FIG. 12). The upper surfaces of the brace beams 38 thus define a generally horizontal barge support surface means. The above-water portions of the extension frames 46 are then connected.
  • the pontoons are further de-ballasted to raise the barge out of the water to a position where installation of the hull extension frames 46 may be completed.
  • portions of the extension frames 46 may be initially constructed on the barge and then extended outwardly to the support columns.
  • the cradle unit provides optimum support for the barge by means of the cross bracing assemblies 35.
  • the bracing assemblies themselves, however, offer minimal obstruction to wave action and thus do not impair vessel stability and movement.
  • LAY BARGE CONVERSION In another preferred embodiment of the invention a conventional floatable barge is converted into a semisubmersible lay vessel suitable for the offshore laying of an elongate flexible element, such as pipeline (FIGS. 4, 6, and 7).
  • This cradle unit 79 includes a pair of port and starboard pontoons 8UP and 808, a plurality of upstanding support columns 82F, 82A and 821, and 84F, 84A, and 841 attached to the pontoons.
  • Bracing assemblies 86 similar to 35 extend between corresponding, opposite support columns.
  • Extension frames 88, 89, and 90 extend between the support columns and the sides of the barge 78.
  • the support columns 84 and the extension frame 90 are arranged to accommodate a lay ramp 92.
  • the lay ramp 92 is downwardly inclined in a foretoaft direction and is carried at the upper ends of the starboard support columns 34.
  • the top outer edges of the support columns 84A and 84l are disposed at levels of progressively diminishing height in a fore-to-aft direction in accordance with the inclination of the ramp 92. That is, the support columns 84A and 84l are recessed at their top outer edges to define shoulders 94 which support the lay ramp 92.
  • the forward, upper end of the lay ramp 92 is substantially flush with the extension frame 90 and the deck of the barge. The lower end of the ramp terminates above the starboard pontoon S adjacent the expected water surface level.
  • the ramp may be of any suitable width, and may extend outwardly of the support columns 34. Accordingly, appropriately sized bracing flanges 98 may be utilized to support the outwardly extending portion of the ramp.
  • the hull extension frame 90 extends along substantially the entire length of the barge to define an auxiliary deck surface 95, which is flush with the working deck of the barge 78.
  • This auxiliary deck can be used to carry equipment associated with pipeline laying, such as pipe storage units and welding equipment and other apparatus such as described in the previously cited patents.
  • additional below-deck quarters may be built into the hull extension frames to accommodate additional personnel, supplies and equipment.
  • the aft starboard support column 34A is provided with a hitch structure 100 suitable for carrying a conventional stinger mechanism (not shown) dur ing laying operations.
  • a stinger and hitch are shown in Lochridge US. Pat. No. 3,606,759, issued on Sept. 21, 1971 and assigned to the assignee of this invention. The disclosure of this Lochridge patent is incorporated herein by reference.
  • the procedure for converting the barge into a semisubmersible lay barge is similar to that described in accordance with FIGS. 10 through 13.
  • the pontoons 80S and 801 are constructed and floated.
  • the remaining portions of the cradle 79, including the lay ramp 92, are then installed.
  • the conventional barge 78 is floated into position between the support columns, and is raised by the cradle unit such that the frame extensions 88, 89, and 90 may be connected between the barge and the support columns.
  • the barge is rendered capable of semisubmersible operation for the off-shore laying of elongated flexible elements, such as pipeline.
  • auxiliary pipe-laying equipment including a stinger unit and pipe-tensioner unit may be mounted on the cradle prior to the initiation of a pipe-laying operation.
  • the crane 102 may be desirable to re-locate the crane 102 from its center-line position to a location P off-set toward the port side in order to compensate for the added starboard weight imposed by the lay ramp and lay equipment.
  • the crane may be partially located on the frame extension 89 which is of a length sufficient to accommodate the crane. Such an arrangement also serves to increase the effective reach of the crane over the port side.
  • An offset arrangement of the crane may also be utilized in connection with the barge conversion assembly described in connection with FIGS. 1, 2, and 4, should it be desired to increase the outward reach of the crane. Compensation for the offset forces imposed by the crane during lifting operations may be provided by suitable ballasting of the submersible hulls 30S and 30F.
  • FIG. 5 One alternate arrangement is shown in which a barge is seated upon shoulders 112 formed in the starboard support columns 114.
  • the barge is also supported by a plurality of brace assemblies 116 and is connected to a frame extension 118 projecting from the port support columns 120.
  • the frame extension 118 defines an auxiliary working deck on which various equipment, such as a crane, can be mounted. Also, additional crew quarters and storage compartments may be installed in the belowdeck portion of the frame extension 118. Assemblage of the structure shown in FIG. 5 is accomplished in a manner similar to the procedure discussed in connection with FIGS. 10 through 13. In this instance, however, the barge will be floated to an offset position adjacent the barge receiving zone, e.g., wherein its starboard side is situated over the shoulders 112. Subsequent to being lifted by the cradle unit, the barge is connected to the starboard support columns 1 14 and to the frame extension 118.
  • the present invention provides novel methods and apparatus for enabling a conventional floatable barge to be effectively converted into a semisubmersible vessel.
  • a pre-existing barge which meets structural and design standards required of sea-going vessels may be transformed into a semisubmersible with only minimal amounts of barge modification.
  • the cradle unit is constructed in a manner which produces optimum strength and stability, while presenting minimal obstruction to free travel through the water. This is the result of the compact, yet effective, bracing assemblies which rigidify the cradle elements into a unitary, independently floatable structure capable of withstanding highly severe wave environments.
  • the relatively skeletal arrangement of the bracing assemblies assures that the stability and maneuverability of the vessel will not be unduly impaired by wave action.
  • the bracing assembly also provides a guide for enabling the ballasting systems of the submersible hulls to be conveniently interconnected.
  • the present invention is also highly advantageous in affording rapid conversion of a conventional barge into a semisubmersible lay barge.
  • a lay ramp is carried by the cradle unit and is arranged to be operably associated with the barge working deck.
  • frame extensions which are rigidly connected between the barge and the support columns enables the effective working deck area of the barge to be extended, as well as enabling extra below-deck quarters to be added. This added area may be utilized to mount an offset crane, a feature which is particularly advantageous in counterbalancing the barge.
  • a method of converting a floatable barge having a working deck into a semi-submersible vessel comprising the steps of:
  • transverse bracing means interconnecting said port columns with said starboard columns, said bracing means comprising lower transverse bracing, upper transverse bracing, and intermediate diagonal bracing, and
  • buoyancy means for selectively ballasting and deballasting said submersible hull members
  • said upper transverse bracing defines a horizontally disposed support surface means disposed below the surface ofthe body of water between the port and starboard submersible hull members, and
  • buoyancy means for de-ballasting said hull members and increasing the postive buoyancy thereof to:
  • step of providing said buoyancy means includes the steps of providing a plurality of ballast chambers and ballast pumping means in each hull, and communicating the ballast pumping means of each hull by conduit means extending through one of said brace beams.
  • step of floating said barge includes the step of floating a barge having a rotary crane mounted on a working deck thereof with the rotary crane axis extending generally through the centerline of said barge.
  • step of floating said barge includes the step of floating said barge such that the centerline thereof is offset within said barge receiving zone; and said step of rigidly welding includes the steps of welding a frame extension between the barge and the support columns at one side of said cradle unit and arranging an upper horizontal surface of said frame extension to extend along a substantial portion of the length of the barge generally flush with a working deck portion of said barge.
  • a method of converting a floatable barge having a working deck into a semisubmersible lay vessel suitable for laying an elongate flexible means into a body of water comprising the steps of:
  • transverse bracing means interconnecting said port columns with said starboard columns, said bracing means including upper and lower transverse bracing and intermediate diagonal bracing, and
  • buoyancy means for selectively ballasting and deballasting said submersible hull members
  • said upper transverse bracing defines a horizontally disposed support surface means disposed below the surface ofthe body of water between the port and starboard submersible hull members, and
  • a method according to claim 6 including the step of attaching a stinger mechanism to said cradle unit at the aft-most column supporting said ramp.

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  • Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Bridges Or Land Bridges (AREA)
  • Cleaning Or Clearing Of The Surface Of Open Water (AREA)
US348594A 1973-04-06 1973-04-06 Method for converting a floatable barge into a semi-submersible vessel Expired - Lifetime US3894503A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US348594A US3894503A (en) 1973-04-06 1973-04-06 Method for converting a floatable barge into a semi-submersible vessel
GB1318474A GB1438916A (en) 1973-04-06 1974-03-25 Method and apparatus for converting a floatable barge into a semi-submersible vessel
CA196,345A CA990588A (en) 1973-04-06 1974-03-29 Method and apparatus for converting a floatable barge into a semi-submersible vessel
AU67416/74A AU472884B2 (en) 1973-04-06 1974-04-02 Method and apparatus for converting a flotable barge into a semi-submersible vessel
NL7404577A NL7404577A (de) 1973-04-06 1974-04-03
DE2416357A DE2416357A1 (de) 1973-04-06 1974-04-04 Verfahren und vorrichtung zum umwandeln eines schwimmponton in ein halb-tauchfaehiges schwimmfahrzeug, insbesondere eine schwimmende arbeitsinsel

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US348594A US3894503A (en) 1973-04-06 1973-04-06 Method for converting a floatable barge into a semi-submersible vessel

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US3894503A true US3894503A (en) 1975-07-15

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US348594A Expired - Lifetime US3894503A (en) 1973-04-06 1973-04-06 Method for converting a floatable barge into a semi-submersible vessel

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US (1) US3894503A (de)
AU (1) AU472884B2 (de)
CA (1) CA990588A (de)
DE (1) DE2416357A1 (de)
GB (1) GB1438916A (de)
NL (1) NL7404577A (de)

Cited By (16)

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US4112864A (en) * 1976-10-08 1978-09-12 Seatek Corporation Heave stabilization of semi-submersible platforms
US4165702A (en) * 1974-07-08 1979-08-28 Santa Fe International Corporation Method of constructing a twin hulled, column stabilized, semi-submersible derrick barge
US4207828A (en) * 1977-01-20 1980-06-17 Varitrac Ag Stabilizing system for a crane vessel
US4230420A (en) * 1978-10-12 1980-10-28 Brown & Root, Inc. Semi-submersible pipelaying vessel having an improved pipelaying path
US4231313A (en) * 1976-02-19 1980-11-04 Varitrac Ag Stabilizing system on a semi-submersible crane vessel
US4421051A (en) * 1979-10-29 1983-12-20 Sedco, Inc. Auxiliary boom for emergency evacuation
US4516882A (en) * 1982-06-11 1985-05-14 Fluor Subsea Services, Inc. Method and apparatus for conversion of semi-submersible platform to tension leg platform for conducting offshore well operations
US4538939A (en) * 1984-02-17 1985-09-03 Transworld Drilling Company Method for ballasting a vessel
US4716972A (en) * 1982-06-15 1988-01-05 Oy Wartsila Ab Floating drilling platform
US5279240A (en) * 1990-08-14 1994-01-18 Worley Marvin S Floating oil/gas production terminal
US5388930A (en) * 1992-04-06 1995-02-14 Rowan Companies, Inc. Method and apparatus for transporting and using a drilling apparatus or a crane apparatus from a single movable vessel
US5558037A (en) * 1995-03-15 1996-09-24 Manning; Foster T. Semisubmersible vessel with forward-mounted crane
US6257165B1 (en) 1999-12-20 2001-07-10 Allen Danos, Jr. Vessel with movable deck and method
US20080240863A1 (en) * 2007-03-30 2008-10-02 Remdial (Cyprus) Pcl Elevating support vessel and methods thereof
CN103373439A (zh) * 2012-04-24 2013-10-30 烟台中集来福士海洋工程有限公司 用于半潜平台建造中的横撑及半潜平台建造方法
CN104401450A (zh) * 2014-11-13 2015-03-11 广州打捞局 一种打桩船船体

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NL7710267A (nl) * 1977-09-19 1979-03-21 Ir Arie Van Der Landen Werkwijze voor het opbouwen van een marinecon- structie en voor het opbouwen en transporteren van de bovenbouw daarvan, en vaartuig ten gebrui- ke daarbij.
FR2474992B1 (fr) * 1980-02-05 1987-11-27 Doris Dev Richesse Sous Marine Dispositif flottant pour travaux en mer
FR2541333A1 (fr) * 1983-02-21 1984-08-24 Fayren J Pont flottant perfectionne
GB2137578B (en) * 1983-04-05 1987-02-04 Worley Eng Floating vessels
GB8412540D0 (en) * 1984-05-17 1984-06-20 Worley Eng Ltd Multi-hulled vessels

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US3616773A (en) * 1968-09-04 1971-11-02 Santa Fe Int Corp Twin hull variable draft drilling vessel
US3680342A (en) * 1970-01-26 1972-08-01 Fluor Ocean Services Apparatus for laying pipelines
US3685305A (en) * 1970-08-17 1972-08-22 Santa Fe Int Corp Column stabilized stinger
US3797438A (en) * 1971-06-11 1974-03-19 Hijos De J Barreras Sa Method for the construction of floating units of great dimensions

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Publication number Priority date Publication date Assignee Title
US3616773A (en) * 1968-09-04 1971-11-02 Santa Fe Int Corp Twin hull variable draft drilling vessel
US3572041A (en) * 1968-09-18 1971-03-23 Shell Oil Co Spar-type floating production facility
US3610192A (en) * 1969-01-31 1971-10-05 Mcmullen Ass John J System of moving laden ships through shallow draft-limited waters
US3680342A (en) * 1970-01-26 1972-08-01 Fluor Ocean Services Apparatus for laying pipelines
US3685305A (en) * 1970-08-17 1972-08-22 Santa Fe Int Corp Column stabilized stinger
US3797438A (en) * 1971-06-11 1974-03-19 Hijos De J Barreras Sa Method for the construction of floating units of great dimensions

Cited By (17)

* Cited by examiner, † Cited by third party
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US4165702A (en) * 1974-07-08 1979-08-28 Santa Fe International Corporation Method of constructing a twin hulled, column stabilized, semi-submersible derrick barge
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CN103373439B (zh) * 2012-04-24 2016-02-03 烟台中集来福士海洋工程有限公司 用于半潜平台建造中的横撑及半潜平台建造方法
CN104401450A (zh) * 2014-11-13 2015-03-11 广州打捞局 一种打桩船船体

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AU472884B2 (en) 1976-06-10
GB1438916A (en) 1976-06-09
CA990588A (en) 1976-06-08
AU6741674A (en) 1975-10-02
DE2416357A1 (de) 1974-10-24
NL7404577A (de) 1974-10-08

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