EP0053861A1 - Künstliche Insel - Google Patents

Künstliche Insel Download PDF

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Publication number
EP0053861A1
EP0053861A1 EP81201329A EP81201329A EP0053861A1 EP 0053861 A1 EP0053861 A1 EP 0053861A1 EP 81201329 A EP81201329 A EP 81201329A EP 81201329 A EP81201329 A EP 81201329A EP 0053861 A1 EP0053861 A1 EP 0053861A1
Authority
EP
European Patent Office
Prior art keywords
legs
platform
artificial island
beams
island according
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.)
Granted
Application number
EP81201329A
Other languages
English (en)
French (fr)
Other versions
EP0053861B1 (de
Inventor
Bart Boon
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.)
Gusto Engineering BV
Original Assignee
Gusto Engineering BV
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 Gusto Engineering BV filed Critical Gusto Engineering BV
Publication of EP0053861A1 publication Critical patent/EP0053861A1/de
Application granted granted Critical
Publication of EP0053861B1 publication Critical patent/EP0053861B1/de
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/006—Platforms with supporting legs with lattice style supporting legs
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0073—Details of sea bottom engaging footing
    • E02B2017/0082—Spudcans, skirts or extended feet

Definitions

  • the invention relates to an artificial island comprising a platform, such as a pontoon, and at least three legs for putting down the island onto the sea bottom and for supporting the platform, and furthermore means for mutually displacing and locking the legs and the platform.
  • a platform such as a pontoon
  • at least three legs for putting down the island onto the sea bottom and for supporting the platform, and furthermore means for mutually displacing and locking the legs and the platform.
  • Various embodiments of such artificial islands are known. In general they consist of a platform embodied as a pontoon and a number of legs which can be displaced and lockede into tubular guiding elements of the pontoon by means of a jacking and latching mechanism.
  • the pontoon because of the buoyancy of the pontoon it is possible to transport the island to the place of destination where the legs are lowered using the jacking mechanism, whereafter the pontoon by further using the jacking mechanism is moved upwards along said legs upto a level out of reach of the waves.
  • Such an artificial island is in the operating position, that means in he position in which the pontoon is elevated above the water level, exposed to external horizontal loads caused by the forces of waves, wind etc, resulting into bending moments in the legs and in the pontoon construction. Therefore the pontoon and legs are coupled to each other such that these bending moments can be transferred and absorbed. Said bending moments are maximum at the points where the pontoon and the legs are coupled to each other.
  • the legs have a horizontal cross-section which is uniform over the whole length of the legs. Thereby it is possible that in each relative position of the leg and the pontoon said legs can be locked correctly into the guiding elements of the pontoon.
  • An object of the invention is now to provide an artificial island having a light contruction, which island is better suited for great water depths and/or heavier weather conditions and yet is simple of construction.
  • Said object is according to the invention reached in that the legs are located outside the perimeter of the platform, the supporting joint between the platform and each of said legs has the function of a pivot joint, and at least those aections of said legs, standing onto the sea bottom or to be placed thereon, are connected to each other in planes passing outside the perimeter of said platform to get a rigid structure. Because the legs are connected to each other into a rigid configuration and the platform is supported by said legs through pivot point supports the horziontal loads do not result into bending moments which are maximum at the beginning of the section rigidized by the coupling. In islands, which are for their dimensions etc comparable, these maximal moments amount furthermore only a part, for instance half of the maximal moments which are generated into the known constructions.
  • connection preferably consists of horizontally extending connecting beams positioned into the same plane and at a height between the ends of said legs and rigidly connected to said legs, and furthermore by a cross-configuration of tie beams or cables underneath said connecting beams.
  • rigidly connected horizontal beams and the cross-configuration of tie beams or cables a light construction can be realized.
  • the horizontal beams are thereby located at the half height of said legs.
  • connections can be realized by cross-configurations and/or one or more horizontal cables. If these connections are hindering the accessibility, for instance the supply of material, then the connections positioned above the horizontal beams can be embodied removable. Such removable cable connections can also be useful to couple the upper ends of said legs together when said legs are in the raised position.
  • the invention makes it possible to alter the horizontal cross-section of each leg in the height- or longitudinal direction of said leg.
  • Said cross-section can be adapted to the acting momental load such that the cross-section narrows from the horizontal beams to the ends of the legs. It is also possible to enlarge the cross-section of the part underneath said beams to get an increaed standing surface and therewith an increased stability.
  • legs are coupled to each other into a rigid configuration it is not possible as by the known islands to adapt said legs independent of each other in vertical direction and also adaptions to bottom irregularities are not simply possible anymore.
  • One of the measures to avoid inclination respectively to make.adaptions possible is according to the invention to provide the legs with extendible and retractable jacks or auxiliary legs. These means are individually known from the prior art, just as the possibility to provide the under side of the legs with displacing means, such as catte- rpillar units.
  • an artificial island comprising a supporting frame with in vertical direction in relation thereto displaceable supporting legs and rigidly thereto connected upwards directed columns for moving the pontoon there a long and arrresting said pontoon.
  • the moments resulting from horizontal loads are transferred through the columns and the legs with the thereto coupled supporting frame and have a value which is approximately half the value generated in islands having throughgoing columns whereby the coupling between the legs and the pontoon is realized by means of leg guiding elements onto said pontoon.
  • the necessity to use guiding elements for said legs which are able to receive said moments however still consists and the supporting frame carrying said columns therefore is- still a heavy construction.
  • the island illustrated in Fig. 1 comprises three legs 1, 2 and 3 contained into a framework. Between said legs the platform 4, embodied as a pontoon, is supported by not in detail illustrated couplings 5, 6, 7 respectively, embodied as pivot joint supports for supporting the legs 1, 2 and 3 and in the upstanding sections 8 and 9 thereof a jacking and latching mechanism, which is also not illustrated in detail is housed. Said mechanism can be realized by jacking and latching cylinders cooperating with latching beams and working with gear racks or toothed sections or other known means.
  • the legs 1 until 3 are coupled into a stiff configuration by means of the horizontal beams 12, 13 and 14 which are, as is the best illustrated in Fig. 2, extending such that they are positioned outside the vertical bounding surface of the pe- rimeterence of the pontoon 4 and further consisting of cross- configurated tie beams or cables 15 and 16.
  • Fig. 3 differs from that illustrated in Fig. 1 in fact only in that the legs have a cross-sectional shape with a maximum dimension at the height of the horizontal beams 12 and a cross-sectional dimension which is narrowing in the upwards and downwards leg direction as adaption of the necessary material to the generated maximal momental load.
  • the legs 1 and 2 which are rigidly coupled by the beams 12 and the cross-configurations 15, 16, are enlarged by the sidewards extending broadenings 18 and 19 such that an increassed carrying surface is realized.
  • Fig. 4 also indicates that it is possible to install one or more cross-configurations 20, 21 and/or horizontal tie cables 22 in the section above the horizontal beam 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Prostheses (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Foundations (AREA)
EP81201329A 1980-12-09 1981-12-04 Künstliche Insel Expired EP0053861B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8006679A NL8006679A (nl) 1980-12-09 1980-12-09 Kunstmatig eiland.
NL8006679 1980-12-09

Publications (2)

Publication Number Publication Date
EP0053861A1 true EP0053861A1 (de) 1982-06-16
EP0053861B1 EP0053861B1 (de) 1985-03-20

Family

ID=19836301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81201329A Expired EP0053861B1 (de) 1980-12-09 1981-12-04 Künstliche Insel

Country Status (3)

Country Link
EP (1) EP0053861B1 (de)
NL (1) NL8006679A (de)
NO (1) NO151835C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175257A (en) * 1985-05-21 1986-11-26 Rsv Gusto Eng Bv Jack up island
FR2731727A1 (fr) * 1995-03-14 1996-09-20 Solmarine Plate-forme maritime a haubans
EP3584369A1 (de) * 2018-06-18 2019-12-25 Vallourec Deutschland GmbH Vorrichtung zum nivellieren einer offshore-fundamentkonstruktion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210408A (en) * 1938-09-08 1940-08-06 Lee C Moore & Company Inc Marine working platform substructure
US3367119A (en) * 1966-01-20 1968-02-06 Signal Oil & Gas Co Flotation device for offshore platform assembly
US3402557A (en) * 1966-08-24 1968-09-24 Clayton R. Steele Supporting structure for offshore drilling rigs
GB1220689A (en) * 1967-12-29 1971-01-27 Nederlandse Offshore Co Method and apparatus for the construction of an offshore platform
NL7201658A (de) * 1971-02-08 1972-08-10
US3727414A (en) * 1971-06-28 1973-04-17 Bowden Drilling Services Ltd Off shore drilling platform construction

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2210408A (en) * 1938-09-08 1940-08-06 Lee C Moore & Company Inc Marine working platform substructure
US3367119A (en) * 1966-01-20 1968-02-06 Signal Oil & Gas Co Flotation device for offshore platform assembly
US3402557A (en) * 1966-08-24 1968-09-24 Clayton R. Steele Supporting structure for offshore drilling rigs
GB1220689A (en) * 1967-12-29 1971-01-27 Nederlandse Offshore Co Method and apparatus for the construction of an offshore platform
NL7201658A (de) * 1971-02-08 1972-08-10
US3727414A (en) * 1971-06-28 1973-04-17 Bowden Drilling Services Ltd Off shore drilling platform construction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175257A (en) * 1985-05-21 1986-11-26 Rsv Gusto Eng Bv Jack up island
FR2731727A1 (fr) * 1995-03-14 1996-09-20 Solmarine Plate-forme maritime a haubans
EP3584369A1 (de) * 2018-06-18 2019-12-25 Vallourec Deutschland GmbH Vorrichtung zum nivellieren einer offshore-fundamentkonstruktion
WO2019243363A1 (en) * 2018-06-18 2019-12-26 Vallourec Deutschland Gmbh Device for levelling an offshore foundation construction
US11377807B2 (en) 2018-06-18 2022-07-05 Vallourec Deutschland Gmbh Device for levelling an offshore foundation construction

Also Published As

Publication number Publication date
NO814183L (no) 1982-06-10
NO151835B (no) 1985-03-04
NO151835C (no) 1985-06-12
NL8006679A (nl) 1982-07-01
EP0053861B1 (de) 1985-03-20

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