NO852556L - DEVICE FOR A HALF-SUBMITTED VESSEL WITH TWO SIGNIFICANT PARALLEL POUNDS. - Google Patents

DEVICE FOR A HALF-SUBMITTED VESSEL WITH TWO SIGNIFICANT PARALLEL POUNDS.

Info

Publication number
NO852556L
NO852556L NO852556A NO852556A NO852556L NO 852556 L NO852556 L NO 852556L NO 852556 A NO852556 A NO 852556A NO 852556 A NO852556 A NO 852556A NO 852556 L NO852556 L NO 852556L
Authority
NO
Norway
Prior art keywords
pontoons
deck
vessel
pontoon
upper side
Prior art date
Application number
NO852556A
Other languages
Norwegian (no)
Inventor
Per-Olof Ludwigson
Peter J Young
Original Assignee
Goetaverken Arendal Ab
Brown & Root Const
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 Goetaverken Arendal Ab, Brown & Root Const filed Critical Goetaverken Arendal Ab
Publication of NO852556L publication Critical patent/NO852556L/en

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Fluid Mechanics (AREA)
  • Jib Cranes (AREA)
  • Bridges Or Land Bridges (AREA)
  • Earth Drilling (AREA)
  • Discharge Heating (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)

Description

Foreliggende oppfinnelse angår en anordning ved et halvt nedsenkbart fartøy bestående av to vesenlig parallelle pongtonger, og en på minst to støtteben på hver pongtong hvilende dekkonstruksjon som er utstyrt med i det minste en tungløftskran. Et slikt fartøy benyttes f.eks. ved tunge løftearbeider innen offshoreindustrien, f.eks. for reising og montering av utstyr ved produksjonsplattformer The present invention relates to a device for a semi-submersible vessel consisting of two substantially parallel pontoons, and a deck structure resting on at least two support legs on each pontoon, which is equipped with at least one heavy-lift crane. Such a vessel is used e.g. for heavy lifting work within the offshore industry, e.g. for erecting and assembling equipment at production platforms

og også for transport av tunge seksjoner. Vanligvis er fartøyene ved den ene enden utstyrt med to store svingbare kraner som kan arbeide samtidig ved tunge løft, eller individuelt ved mindre løft. and also for transporting heavy sections. Usually, the vessels are equipped at one end with two large swiveling cranes that can work simultaneously for heavy lifting, or individually for smaller lifting.

Fartøyer av denne art kan være utstyrt med boligrom for en arbeidsstyrke på ca. 600 mann som skal kunne arbeide og sove i skift. Vessels of this type can be equipped with accommodation for a workforce of approx. 600 men who will be able to work and sleep in shifts.

Det foreligger et behov for plattformer med betydeligThere is a need for platforms with significant

større deplasement og lastekapasitet enn tidligere kjente plattformer av denne art. Det oppstår da problem med å kompensere for de ved plattformens bakre ende beliggende eksepsjonelt store kranenes egenvekt, slik at det fåes korrekt trim under plattformens forflytning fra en plass til en annen (såkalt transit condition). greater displacement and load capacity than previously known platforms of this type. A problem then arises with compensating for the exceptionally large dead weight of the cranes located at the rear end of the platform, so that correct trim is obtained during the platform's movement from one place to another (so-called transit condition).

Hensikten med foreliggende oppfinnelse er å fremskaffe en anordning som gir følgende fordeler: The purpose of the present invention is to provide a device which provides the following advantages:

- øker deplasementet i forflytningstilstand,- increases displacement in displacement state,

- kompenserer for ujevn vektfordeling kontra deplasements-fordeling i forflytningstilstanden, - compensates for uneven weight distribution versus displacement distribution in the displacement state,

- forbedrer skrogstyrken ved reduksjon av spenningsnivået- improves hull strength by reducing the stress level

og forbedrer utmattingsholdfastheten,and improves fatigue strength,

- reduserer plattformens bevegelser forårsaket av bølge-energi , - byr på en tunnel som tillater tverrskips forflyting av ballastvann fra den ene pongtongen til den andre. - reduces the platform's movements caused by wave energy, - offers a tunnel that allows the transshipment of ballast water from one pontoon to the other.

Oppfinnelsen erkarakterisert vedat dekkskonstruksjonen bærer i det minste en svingbar tungløftskran ovenfor deplasementslegemet, som har en utbredelse i lengderetningen vesentlig tilsvarende de ovenfor deplasements-legemene beliggende støttebenenes bredde, og er stivt forbundet med pongtongene på en slik måte at den befinner seg under vannflaten, også når fartøyet forflyttes fra en plass til en annen. Legemenes tverrsnitt er hensiktsmessig formet som en vingeprofil, hvis overside er vesentlig plan og horisontal samt beliggende lavere enn dekket ved de tilgrensende pongtongene. Legemets forside er fortrinnsvis bueformet, vesentlig langs en halvsirkel, og dets underside danner en forlengelse i sideretningen av de tilgrensende pongtongenes bunnlinje. The invention is characterized by the fact that the deck construction carries at least one pivotable heavy lifting crane above the displacement body, which has an extension in the longitudinal direction substantially corresponding to the width of the support legs located above the displacement bodies, and is rigidly connected to the pontoons in such a way that it is located below the water surface, even when the vessel is moved from one place to another. The body's cross-section is suitably shaped like a wing profile, the upper side of which is substantially flat and horizontal and situated lower than the deck at the adjacent pontoons. The body's front side is preferably arc-shaped, substantially along a semicircle, and its underside forms an extension in the lateral direction of the bottom line of the adjacent pontoons.

Pongtongenes bunnhud er fortrinnsvis reist så mye ved endene at thrusterpropeller som er montert innen det reiste området befinner seg helt ovenfor bunnlinjen. The bottom skin of the pontoons is preferably raised so much at the ends that thruster propellers mounted within the raised area are completely above the bottom line.

Pongtongene er hensiktsmessig forsynt med et mellomdekk eller en annen indre forsterkningsdel i nivå med forbindelsen mellom legemets overside og pongtongene. Legemet omslutter hensiktsmessig i det minste en tverrgående pasasje for overføring av ballastvann fra den ene pongtongen til den andre. The pontoons are appropriately provided with an intermediate deck or another internal reinforcement part at the level of the connection between the upper side of the body and the pontoons. The body conveniently encloses at least one transverse passage for the transfer of ballast water from one pontoon to the other.

Oppfinnelsen skal i det følgende beskrives nærmere under henvisning til et utførelseseksempel som er vist på tegningene, der In the following, the invention will be described in more detail with reference to an embodiment shown in the drawings, where

fig. 1 viser en plattform ifølge oppfinnelsen i perspektiv, og fig. 1 shows a platform according to the invention in perspective, and

fig. 2 er ,et noe brutt sideriss av plattformens styrbords-side. fig. 2 is a somewhat broken side view of the platform's starboard side.

Plattformen på figurene er av den type som vanligvis kalles semi-submersible, dvs. plattformen er beregnet til under forflytning fra en plass til en annen å flyte med pongtongenes dekk rett over vannflaten, og i arbeidsstilling flyte med pongtongene helt nedsenket i vann og benene del-vis nedsenket i vannet. The platform in the figures is of the type that is usually called semi-submersible, i.e. the platform is intended to float with the pontoons' deck just above the water's surface when moving from one place to another, and in working position to float with the pontoons completely submerged in water and the legs partly - show submerged in the water.

Et arbeidsdekk 10 hviler ved hjelp av fire hjørneben 11A working deck 10 rests with the help of four corner legs 11

på to pongtonger 12. På hver pongtong, mellom de to hjørne-benene 11 er det dessuten anordnet et forsterkningsben 13, som er beregnet til å motvirke nedbøyning av arbeidsdekket 10 når dette belastes. Arbeidsdekket er bygget i kasseform med flere etasjer, og er på oversiden forsynt med to store løftekraner 14 som er svingbare. Ved arbeidsdekkets 10 mot-satte ender, forenden 15, er det anordnet et dekkshus 16 on two pontoons 12. On each pontoon, between the two corner legs 11, a reinforcement leg 13 is also arranged, which is designed to counteract deflection of the working deck 10 when it is loaded. The working deck is built in box form with several floors, and is provided on the upper side with two large lifting cranes 14 which can be swiveled. At the opposite ends of the working deck 10, the front end 15, a deck housing 16 is arranged

med mannskapsrom og styrehus.with crew room and wheelhouse.

Plattformens to pongtonger 12 er akterut forbundet ved hjelp av et vingeformet legeme 19 som både i operasjons- og transportstilling befinner seg under vannlinjen 18 resp. 18a. Ytterligere finnes det hensiktsmessige tverrstag (ikke vist) mellom de fremre endene av pongtongene, resp. mellom de på disse hvilende benene. The platform's two pontoons 12 are connected aft by means of a wing-shaped body 19 which, in both operational and transport positions, is located below the waterline 18 or 18 a. In addition, there are appropriate cross braces (not shown) between the front ends of the pontoons, resp. between those on these resting legs.

Begge pongtongene 12 er forsynt med et antall asimut-thrusterpropeller 20 for posisjonering, styring og fremdrift av fartøyet. De to pongtongene 12 er dessuten ved både for 15 og akter 21 forsynt med et antall ankere. Both pontoons 12 are provided with a number of azimuth thruster propellers 20 for positioning, steering and propulsion of the vessel. The two pontoons 12 are also provided with a number of anchors at both the front 15 and the stern 21.

Seks av thrusterpropellene 20 er beliggende under fartøyets bunnlinje 23 og må trekkes inn dersom fartøyet skal tas til land og tørrsettes i en dokk. De øvrige thrusterpropellene 20 er beliggende på partier 24 av bunnhuden 25,som er reist så mye over bunnlinjen 23 at disse thrusterpropellene 20 befinner seg helt ovenfor bunnlinjen. Six of the thruster propellers 20 are located below the vessel's bottom line 23 and must be retracted if the vessel is to be brought ashore and dry docked. The other thruster propellers 20 are located on parts 24 of the bottom skin 25, which is raised so much above the bottom line 23 that these thruster propellers 20 are completely above the bottom line.

Det vingeformede legemet 19 tilslutter med sin underside 19a til pongtongenes 12 bunnhud 25. Legemets 19 forkant ut-gjøres av et kurvet parti 19b som forbinder nevnte underside 19a med en vesentlig plan og horisontal overside 19c. Denne er beliggende så mye lavere enn pongtongenes dekk at legemet, også i transportstilling, befinner seg under vannflaten. På innsiden av pongtongene 12 er det anordnet for-sterkninger mot hvilke den ytterhudplaten støtter seg, som utgjør nevnte overside 19c. Den plane overside 19c har, The wing-shaped body 19 connects with its underside 19a to the bottom skin 25 of the pontoons 12. The leading edge of the body 19 is made up of a curved part 19b which connects said underside 19a with a substantially flat and horizontal upper side 19c. This is located so much lower than the deck of the pontoons that the body, even in the transport position, is below the surface of the water. Reinforcements are arranged on the inside of the pontoons 12 against which the outer skin plate rests, which forms the aforementioned upper side 19c. The flat upper side 19c has,

ved en prosjektert utførelse, en flate på over 1100 m 2. Deplasementet for dette legemet 19 som anordnet mellom de in a projected design, an area of over 1100 m 2. The displacement of this body 19 which is arranged between the

to pongtongene er ca. 6500 tonn ved den prosjekterte ut-førelsen . the two pontoons are approx. 6,500 tonnes in the planned design.

Dette legemet 19 innebærer en betydelig strukturell for-sterkning mellom de to pongtongene 12 og gir et vesentlig deplasementstilskudd i det aktre partiet av fartøyet. This body 19 involves a significant structural reinforcement between the two pontoons 12 and provides a significant displacement allowance in the aft part of the vessel.

I fartøyets operasjonsstilling befinner legemets overside 19c seg ca. 20 m under vannflaten og danner i dette nivå en effektiv demper mot vertikale bevegelser i plattformen som genereres ved sjøgang. In the vessel's operating position, the upper side 19c of the body is located approx. 20 m below the water surface and at this level forms an effective damper against vertical movements in the platform that are generated by seagoing.

Legemet 19 er forsynt med indre kanaler 26 gjennom hvilke ballastvann kan pumpes fra den ene pongtongen til den andre når krengningskompensering er nødvendig i tverretningen. Legemet 19 kan dessuten forsynes med en indre passasje 27 gjennom hvilken personell kan passere fra den ene pongtongen til den andre. The body 19 is provided with internal channels 26 through which ballast water can be pumped from one pontoon to the other when heeling compensation is required in the transverse direction. The body 19 can also be provided with an internal passage 27 through which personnel can pass from one pontoon to the other.

Ved at legemet 19, som vist i fig. 2, har en hydrodynamisk gunstig vingeformet profil, er dets slepemotstand i vannet relativt lavt under plattformens forflytning. In that the body 19, as shown in fig. 2, has a hydrodynamically favorable wing-shaped profile, its drag resistance in the water is relatively low during the movement of the platform.

Oppfinnelsen er ikke begrenset til det ovenfor beskrevne utførelseseksemplet, men flere varianter er tenkelige innen rammen for de etterfølgende patentkrav. Det er f.eks. tenke-lig å utstyre legemet 19 med ballasttanker. The invention is not limited to the embodiment described above, but several variants are conceivable within the scope of the subsequent patent claims. It is e.g. conceivable to equip the body 19 with ballast tanks.

Claims (7)

1. Anordning ved et halvt nedsenkbart fartøy, bestående av to vesentlig parallelle pongtonger (12) og en på minst to støtteben (11) på hver pongtong (12) hvilende dekkskonstruk-sjon (10) , der pongtongene (12) er forbundet nær minst ett av de fremre eller bakre støttebensparene ved hjelp av et deplaserende legeme (19),som bygger over hele avstanden mellom pongtongene (12), karakterisert ved at dekkskonstruksjonen (10) bærer i det minste en svingbart tungløftskran ovenfor deplasementslegemet (19) som har en utbredelse i lengderetningen vesentlig motsvarende de ovenfor legemet beliggende støttebenenes (11) bredde, og er stivt forbundet med pongtongene på en slik måte at legemet befinner seg under vannflaten (18,18a) også når fartøyet forflyttes fra en plass til en annen.1. Device for a semi-submersible vessel, consisting of two substantially parallel pontoons (12) and a deck construction (10) resting on at least two support legs (11) on each pontoon (12), where the pontoons (12) are connected close to at least one of the front or rear support leg pairs by means of a displacing body (19), which builds over the entire distance between the pontoons (12), characterized in that the deck structure (10) carries at least one pivotable heavy lifting crane above the displacing body (19) which has a extension in the longitudinal direction substantially corresponding to the width of the support legs (11) located above the body, and is rigidly connected to the pontoons in such a way that the body is located below the water surface (18,18a) also when the vessel is moved from one place to another. 2. Anordning ifølge krav 1, karakterisert ved at legemets (19) tverrsnitt er formet som en vingeprofil hvis overside (19c) er vesentlig plan og horisontal, samt beliggende lavere enn dekket ved de tilgrensende pongtongene.2. Device according to claim 1, characterized in that the cross-section of the body (19) is shaped like a wing profile whose upper side (19c) is substantially flat and horizontal, and located lower than the deck at the adjacent pontoons. 3. Anordning ifølge et eller flere av kravene fra 1-2, karakterisert ved at legemets (19) forside (19b) er bueformet, vesentlig langs en halvsirkel,3. Device according to one or more of the claims from 1-2, characterized in that the front side (19b) of the body (19) is arc-shaped, substantially along a semicircle, 4. Anordning ifølge et eller flere av foregående krav, karakterisert ved at legemets (19) underside (19a) danner en forlengelse i sideretningen av de tilgrensende pongtongenes (12) bunnlinje (23).4. Device according to one or more of the preceding claims, characterized in that the underside (19a) of the body (19) forms an extension in the lateral direction of the bottom line (23) of the adjacent pontoons (12). 5. Anordning ifølge krav 4, karakterisert ved at pongtongenes (12) bunnhud er reist så meget ved endene, at thrusterpropeller (20) som er montert innen det reiste området (24) befinner seg helt ovenfor bunnlinjen (23).5. Device according to claim 4, characterized in that the bottom skin of the pontoons (12) is raised so much at the ends that the thruster propellers (20) which are mounted within the raised area (24) are completely above the bottom line (23). 6. Anordning ifølge et eller flere av foregående krav, karakterisert ved at pongtongene (12) er forsynt med hvert sitt mellomdekk eller en annen indre forsterkningsdel i nivå med forbindelsen mellom legemets (19)overside (19c) og pongtongene (12).6. Device according to one or more of the preceding claims, characterized in that the pontoons (12) are each provided with an intermediate deck or another internal reinforcement part at the level of the connection between the upper side (19c) of the body (19) and the pontoons (12). 7. Anordning ifølge et eller flere av foregående krav, karakterisert ved at legemet (19) omslutter i det minste en tverrgående passasje (26) for overføring av ballastvann fra den ene pongtongen til den andre.7. Device according to one or more of the preceding claims, characterized in that the body (19) encloses at least one transverse passage (26) for the transfer of ballast water from one pontoon to the other.
NO852556A 1984-06-26 1985-06-25 DEVICE FOR A HALF-SUBMITTED VESSEL WITH TWO SIGNIFICANT PARALLEL POUNDS. NO852556L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8403389A SE449976B (en) 1984-06-26 1984-06-26 DEVICE AT A HALF SUBMITTABLE VESSEL WITH TWO MAIN PARALLEL PONTONES

Publications (1)

Publication Number Publication Date
NO852556L true NO852556L (en) 1985-12-27

Family

ID=20356344

Family Applications (1)

Application Number Title Priority Date Filing Date
NO852556A NO852556L (en) 1984-06-26 1985-06-25 DEVICE FOR A HALF-SUBMITTED VESSEL WITH TWO SIGNIFICANT PARALLEL POUNDS.

Country Status (3)

Country Link
GB (2) GB8514613D0 (en)
NO (1) NO852556L (en)
SE (1) SE449976B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1009043C2 (en) * 1998-04-29 1999-11-01 Huisman Spec Lifting Equip Bv Partially submergible vessel provides platform for oil or gas drilling operations
CN103395477B (en) * 2013-08-07 2015-09-16 中远航运股份有限公司 Combined semi-submerged ship and compound type semi-submerged ship
CN106976530A (en) * 2016-01-18 2017-07-25 中国国际海运集装箱(集团)股份有限公司 Semisubmersible platform
CN106428440A (en) * 2016-12-01 2017-02-22 江苏科技大学 Hinged truss type twin-hull floating crane

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1425593A (en) * 1973-10-19 1976-02-18 Deep Oil Technology Inc Offshore marine apparatus

Also Published As

Publication number Publication date
SE449976B (en) 1987-06-01
SE8403389L (en) 1985-12-27
GB2163393B (en) 1988-02-03
SE8403389D0 (en) 1984-06-26
GB8514613D0 (en) 1985-07-10
GB8516082D0 (en) 1985-07-31
GB2163393A (en) 1986-02-26

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