EP1129258B1 - Construction en mer - Google Patents

Construction en mer Download PDF

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Publication number
EP1129258B1
EP1129258B1 EP99950974A EP99950974A EP1129258B1 EP 1129258 B1 EP1129258 B1 EP 1129258B1 EP 99950974 A EP99950974 A EP 99950974A EP 99950974 A EP99950974 A EP 99950974A EP 1129258 B1 EP1129258 B1 EP 1129258B1
Authority
EP
European Patent Office
Prior art keywords
deck
leg
offshore structure
plate
legs
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
EP99950974A
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German (de)
English (en)
Other versions
EP1129258A1 (fr
Inventor
David Collier
Gordon Jackson
John Roberts
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Ove Arup Partnership Ltd
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Ove Arup Partnership Ltd
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Publication date
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Publication of EP1129258A1 publication Critical patent/EP1129258A1/fr
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Publication of EP1129258B1 publication Critical patent/EP1129258B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
    • 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
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/06—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for immobilising, e.g. using wedges or clamping rings
    • 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
    • E02B2017/0039—Methods for placing the offshore structure
    • 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
    • E02B2017/0086—Large footings connecting several legs or serving as a reservoir for the storage of oil or gas

Definitions

  • the present invention relates to offshore structures such as for example, relocatable oil production platforms.
  • the present invention therefore seeks to provide an improved offshore structure in which a jacking system is not used to hold up the deck.
  • US-A-3,974,657 discloses an offshore structure comprising a base, a deck having two substantially parallel side edges and a plurality of legs extending between the base and the deck, wherein the legs are arranged outboard of the parallel side edges and a permanent connection is provided between each said leg and the deck.
  • each said leg is a lattice leg comprising a vertically extending chord at each corner thereof, and in that the permanent connection comprises a shear plate attached substantially vertically between the deck and each said leg chord and is provided between an inwardly facing face of each said leg and the deck.
  • the deck may be raised to the required height relatively easily. Also, the formation of the connection between the legs and the deck allows the jacking system easily to be removed after installation. Thus, a standard jacking system can be hired for the duration of the installation of the structure, avoiding the manufacturing and maintenance costs involved with the permanent jacking systems of the prior art.
  • the deck is formed so that it does not include recesses for the legs.
  • the deck is generally rectangular.
  • the jacking system provided to raise the deck is also arranged entirely outside the line of the deck.
  • each chord of each lattice leg is circular in cross-section.
  • the lattice leg may be of any shape which satisfies the design requirements for a particular structure. However, preferably the lattice leg is triangular.
  • connection further comprises a stiffening plate extending through a diameter of the tubular member, wherein a first end of the shear plate is welded to the stiffening plate and the shear plate and the stiffening plate are substantially aligned.
  • This provides a relatively simple means of connecting the shear plate to the tubular member and also provides extra strength in the structure.
  • the deck could be raised to the same height on each of the legs of the structure.
  • the stiffening plate preferably extends over a greater length of the chord than the length of shear plate.
  • the shear plate need not be accurately aligned in the vertical direction before being welded to the stiffening plate.
  • the inboard end of the shear plate is welded between two plates extending outwardly from the deck edge.
  • connection preferably further comprises at least one further coupling plate attached horizontally between the deck and the leg chords.
  • This plate may carry tensile and compressive forces and bending moment loading applied between the deck and the legs.
  • the coupling plate could be attached to the tubular chord and the deck in any suitable manner.
  • the coupling plate has a cut-out in its end facing the leg chord, such that a part of the periphery of the leg chord is received within the cut-out. More preferably still, the cut-out is elliptical in shape. Therefore, a degree of tolerance in angular misalignment of the platform relative to the tubular leg is provided.
  • the coupling plate may be attached to the deck in any suitable manner, it is desirable that the plate be relatively simple to connect to the deck onsite. Preferably therefore, a horizontal web is attached to the deck and the coupling plate is butt welded thereto.
  • the coupling plate could be designed so as to be of sufficient strength itself to carry the necessary loading.
  • plate stiffeners extending from the inboard end to the outboard end and most preferably across the deck web are provided in the coupling plate.
  • a coupling plate is provided both at the top and the bottom of the shear plate.
  • each coupling plate is preferably welded to the shear plate at the join between the plates.
  • connection is formed between the deck and two leg chords located at either end of the inwardly facing face of the lattice legs. Such an arrangement allows a stable connection to be formed between each leg and the deck.
  • the present invention provides a method of installing an offshore structure comprising a base, a deck having two substantially parallel side edges, and a plurality of lattice legs located outboard of the parallel side edges, each said lattice leg comprising a vertically extending chord at each corner thereof, the method comprising the steps of: installing the base on the seabed; jacking the deck to the required height; forming a permanent connection between the deck and an inwardly facing face of each of the legs by attaching a substantially vertically extending shear plate between a chord of each lattice leg and the deck edge; and removing the jacking system from the structure.
  • the deck may be jacked up the leg relatively easily without a high risk of it becoming obstructed.
  • the removal of the jacking system allows the installation of the structure to be carried out at a significantly reduced cost.
  • the jacking mechanism is also preferably entirely located outside the line of the deck.
  • guides are preferably provided on the deck so as to guide the deck as it is jacked up the leg.
  • the deck is hindered from moving excessively relative to the legs.
  • guides may not be necessary depending on the size of the platform, water depth and other factors.
  • the method of installing the offshore structure further comprises the steps of: attaching four legs to the base; attaching two guides to the deck; floating the deck over the base so that it passes between the legs until the guides engage two of said legs; and attaching two guides to the deck.
  • the guides comprise beams attached to and projecting from the deck and being shaped for engaging a chord of a said leg.
  • the deck is located relative to the legs prior to formation of the permanent connection. This allows some elements of the permanent connection to be prefabricated as their approximate dimensions will be known. In addition, as the deck cannot move relative to the legs once it has been located, the permanent connection is easier to make.
  • the deck is located by pulling the leg towards the deck so as to hold a leg chord against the guide.
  • a hydraulic tugger is provided between an outer edge of the leg and the deck so as to pull the leg towards the deck.
  • the legs might skew slightly when the hydraulic tugger is tightened. This is because, the leg chord adjacent the guide would be held in position so that the other leg chord adjacent the deck would continue to be pulled towards the deck, effectively pivoting the leg about the guide. Therefore, hydraulic screw jacks are preferably provided at the base of the platform so as to push the inboard leg chords away from the lower deck edge, thus locating the leg squarely adjacent the deck edge.
  • Each of the legs could be located relative to the deck one by one and the permanent connection formed after each leg was located. However, preferably, the deck is pulled towards each of the legs simultaneously. This allows the location of the deck relative to the legs to be adjusted so as to provide a relatively even gap between each of the legs and the deck.
  • the permanent connection is formed by welding the substantially vertically extending shear plate between a chord of the lattice leg and the deck edge.
  • a stiffening plate is provided through a diameter of the leg chord, and a first side edge of said shear plate is welded to said stiffening plate, and said shear plate and said stiffening plate are substantially aligned.
  • the stiffening plate preferably extends over a greater length of the leg chord than the length of the shear plate.
  • two plates are preferably welded to the deck edge on respective sides of the shear plate and extending outwardly from the deck edge, and the inboard end of the said shear plate is preferably welded between the two plates.
  • the shear plate carries shear forces only such that the web plate does not have to line up precisely with the bulkhead of the deck. Therefore, the connection further preferably comprises a further coupling plate attached horizontally between the deck and the leg chord, the second plate having a cut-out in an edge facing the leg chord, such that a part of the periphery of the leg chord is received within the cut-out. Still more preferably, the cut-out is elliptical in shape.
  • a coupling plate is provided at the top and the bottom of the shear plate. Still more preferably, the shear plate and the coupling plate are welded together.
  • an offshore production platform 2 having a concrete gravity base 4 of conventional construction, four triangular section lattice legs 6, and a deck 8.
  • the gravity base 4 lies on the seabed and a permanent connection is provided between the deck 8 and the legs 6 which are arranged outboard of the deck 8, which carries conventional topsides equipment.
  • lifting beams 10 are provided at the top of each of the lattice legs 6. During installation a jacking system, which will be discussed later will be attached between the lifting beams 10, the deck 8 and the base 4 so that the base and deck may be raised and lowered relative to one another.
  • the deck 8 of the structure is constructed at an onshore site.
  • the deck 8 is of a generally standard rectangular construction and is designed to float, which avoids the need to use separate barges when transporting the structure to the installation site as will be shown below.
  • the deck will provide buoyancy to transport the platform from its place of fabrication to the offshore site, will assist in installing the platform at that site, refloat the platform at the end of its useful life at that site, transport it to another site, and eventually remove the platform to shore to be scrapped.
  • the deck 8 is then launched onto a semi-submersible barge 12 which is submerged so that the deck 8 floats off onto the water ( Figures 3.2 and 3.3).
  • the deck 8 is then towed to a fitting out quay where the topsides are installed on the deck (see Figure 3.4).
  • Figures 3.5 to 3.8 show the construction and installation of the gravity base 4 and legs 6 of the structure.
  • the legs 6 and the base 4 are constructed on shore, one of the legs 6 then being attached to each of the four corners of the base 4 in a conventional manner.
  • a jacking system (not shown) is then assembled between the base 4 and the legs 6.
  • a plurality of strand jacks are connected between the lifting beams 10 at the tops of the legs 4 and the gravity base.
  • the jacking system is arranged outboard of the line of the deck 8.
  • the base 4 is launched onto a semi-submersible barge 12, the barge is submerged and the base and legs are floated off the barge.
  • the base 4 is then sunk in the shallow water close to the shore in preparation for mating with the deck 8.
  • each guide member 14 is made up of a steel beam having an L-shaped recess 16 in one end thereof.
  • the recess 16 has a hardwood facing 17 to minimise contact damage.
  • Two of the guide members 14 at one end of the deck 8 are attached to the upper surface of the deck 8, one on either side thereof, prior to engagement of the base 4 and deck 8, so that as the deck is towed between the legs 6, it will come to rest against two legs 6 of the structure when the respective guide members 14 abut these legs 6.
  • the guide members are used loosely to locate the deck relative to the legs 6.
  • the jacking system 21 includes eight jacks located adjacent each of the four legs 6 of the structure.
  • a set of four jacks 20 for lowering the base 4 relative to the deck 8 on to the seabed is provided adjacent the inner inboard corner 22 of each of the triangular lattice legs 6.
  • Two jacks 24 for raising the deck 8 are provided between each set of base lowering jacks 22 and each leg 6, and a further two deck raising jacks 26 are provided on the other side of each of the legs 6 adjacent the deck 8.
  • Each guide member 14 extends from the deck 8 for location, to engage the outer inboard corner 28 of each leg 6, adjacent the two further deck raising jacks 26.
  • Figure 4 shows the eight jacks 20,24,26 adjacent one of the legs 6 in vertical perspective view.
  • the jacks 20,24,26 are attached to the top of the legs 6 via the lifting beam 10. They extend parallel to the leg 6 to the base 4 where they are held in a jack anchorage 30.
  • the deck 8 located between the lifting beam 10 and base 4 is attached to each of the jacks 20,24,26 via anchor plates 23 attached to the deck 8 after the deck has been floated into position on the base 4.
  • the deck 8 and base 4 may be raised and lowered relative to one another and to the legs 6.
  • the deck 8 is first more accurately located relative to the legs 6.
  • each lattice leg 6 is triangular in shape and has a vertically extending chord 34 at each of its three corners. Two of the three corners of each triangular leg are arranged adjacent the deck edge 32. Thus, the third corner of the leg (referred to as the outboard chord) is positioned further outboard with respect to the deck 8.
  • a strop 36 is attached around the outboard chord 34.
  • a hydraulic tugger 38 is then attached between the strop and a padeye 40 provided at the bottom 42 of the deck edge 32.
  • a pair of inwardly inclided hydraulic screw jacks 44 are positioned between fixed deck brackets 41 extending from the bottom 42 of the deck edge 32 and each of the inboard tubular members 34. The hydraulic tugger 38 is then tensioned so as to pull the respective leg 6 towards the deck 6 and, more specifically, the relevant chord 34 of the leg 6 against the guide member 14.
  • the screw jacks 44 are activated to seat between the deck brackets 41 and the tubular members 34 and the hydraulic tugger 38 is tensioned further so as to hold the connection in position.
  • the temporary connection formed to locate the deck relative to the legs 6, provides a relatively accurate means of location in both the horizontal and vertical planes.
  • FIG. 9 A schematic perspective view of the connection between an inboard chord 34 of a leg 6 and the deck edge 32 is shown in Figure 9.
  • the connection is made up of a vertically extending steel shear plate 46 and upper 48 and lower 50 horizontally extending metal coupling plates.
  • the connection is shown in greater detail in Figures 10 to 13.
  • respective connections are made between each of the two inboard chords 34 of the leg and the deck edge 32.
  • One end of the shear plate 46 is butt welded to one end of a stiffening plate 52 which extends through the diameter of each of the inboard chords 34 to which a connection is to be made (see Figure 12).
  • the shear plate 46 is firstly swung into position between a chord 34 and the deck edge 32. This plate 46 is then butt welded to the stiffening plate 52 along one of its outboard vertical edges.
  • the stiffening plate 52 extends over a greater length L 1 of the chord 34 than the length L 2 of the shear plate 46 to which it is welded. Indeed the stiffening plate extends upwardly as far as the lifting beam 10 in each leg 6.
  • the shear plate 46 is then attached to the platform edge as follows.
  • a first metal plate 54 is fillet welded to the deck edge 32 so that it extends out from the deck adjacent one side of the shear plate 46.
  • a second metal plate 56 is then fillet welded to the deck edge 32 so that it extends adjacent the other side of the shear plate 46.
  • the shear plate 46 is then fillet welded to both of the metal plates 54 and 56. This method of attachment means that the width of the shear plate 46 need not be exactly the same as the distance between the stiffening plate 52 and the deck edge, thereby providing a tolerance in the horizontal positioning of the deck 8 relative to the legs 6.
  • the coupling plates 48,50 are formed with an elliptical cut-out 58 in their outboard edges, as shown in Figures 10 and 13, and each chord is received in a cut-out 58. As the cut-out 58 is elliptical rather than circular, in shape, some degree of angular tolerance is provided in the positioning of the coupling plate 48,50 relative to the chord 34. As can be seen from Figure 13, web 60 extends outwardly from the upper surface 62 of the deck edge 32. Location brackets 63 are pre-welded to the deck 8 and the web 60 so as to assist in alignment of the upper coupling plate 48,50 with the web 60.
  • the coupling plate is then cut to size so as to fit between the web 60 and the chord.
  • One end of the coupling plate 48,50 is positioned against the end of the web 60 and butt welded to the web, while the other end of the coupling 48,50 is butt welded to the chord 34 around the circumference of the cut-out 58.
  • the coupling plates 48,50 are also fillet welded to the shear plate 46. Thus, again, tolerance is allowed in the horizontal distance between the leg and platform.
  • Plate stiffeners 64 are also welded across the coupling plates 48 and 50 and their respective webs 60.
  • connection between the deck 8 and each leg chord 34 thus comprises a shear plate 46, and two coupling plates 48,50, and this provides a strong connection capable of withstanding both shear and bending loads.
  • the jacking system may then be removed.
  • the platform may have any number of legs and those legs could be of any shape, for example, they could be square.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Revetment (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

L'invention concerne une construction en mer2) qui comprend un socle (4), un pont (8) et plusieurs pieds-treillis (6) qui s'étendent entre le socle et le pont. Les pieds sont aménagés à l'extérieur du pont, et des raccords sont mis en place entre la face tournée vers l'intérieur de chaque pied et le pont.

Claims (31)

  1. Construction en mer comprenant une base (4), un pont (8) présentant deux bords latéraux sensiblement parallèles, et une pluralité de pieds (6) s'étendant entre la base et le pont, dans laquelle les pieds sont arrangés à l'extérieur des côtés latéraux parallèles, et une connexion permanente est prévue entre chacun desdits pieds et le pont, caractérisée en ce que chacun desdits pieds comprend un pied en treillis comprenant une corde s'étendant verticalement (34) à chaque coin de ceux-ci, et en ce que la connexion permanente est prévue entre une face orientée vers l'intérieur de chacun desdits pieds et le pont et comprend une plaque de cisaillement (46) attachée essentiellement verticalement entre le pont et chacune desdites cordes de pied.
  2. Construction en mer selon la revendication 1, dans laquelle chacune desdites cordes de pied (34) est de section transversale circulaire.
  3. Construction en mer selon la revendication 1 ou 2, dans laquelle chacun desdits pieds en treillis (6) est triangulaire.
  4. Construction en mer selon l'une quelconque des revendications précédentes, dans laquelle la connexion comprend en outre une plaque de raidissement (52) s'étendant à travers un diamètre de la corde de pied (34), dans laquelle un premier bord latéral de ladite plaque de cisaillement (46) est soudé à ladite plaque de raidissement, et ladite plaque cisaillement et ladite plaque de raidissement sont essentiellement alignées.
  5. Construction en mer selon la revendication 4, dans laquelle la plaque de raidissement (52) s'étend sur une plus grande longueur de la corde de pied (34) que la plaque de cisaillement (46).
  6. Construction en mer selon l'une quelconque des revendications précédentes, dans laquelle l'extrémité intérieure de ladite plaque de cisaillement (46) est soudée entre deux plaques (54, 56) s'étendant vers l'extérieur à partir du bord du pont.
  7. Construction en mer selon l'une quelconque des revendications précédentes, dans laquelle la connexion comprend en outre une plaque de couplage métallique supplémentaire (48, 50) attachée horizontalement entre le pont et la corde de pied.
  8. Construction en mer selon la revendication 7, dans laquelle la plaque de couplage comporte une entaille (58) dans un bord opposé à la corde de pied (34) de telle sorte qu'une partie de la périphérie de la corde de pied soit maintenue à l'intérieur de l'entaille.
  9. Construction en mer selon la revendication 8, dans laquelle l'entaille est de forme elliptique.
  10. Construction en mer selon l'une quelconque des revendications 7 à 9, dans laquelle une bande horizontale (60) est attachée au pont (8), et la plaque de couplage (48, 50) est soudée bout à bout à celle-ci.
  11. Construction en mer selon l'une quelconque des revendications 7 à 10, dans laquelle des raidisseurs de plaque (64) s'étendant à partir de l'extrémité intérieure jusqu'à l'extrémité extérieure sont prévus dans la plaque de couplage (48, 50).
  12. Construction en mer selon l'une quelconque des revendications 7 à 11, dans laquelle une plaque de couplage (48, 50) est prévue en haut et en bas de la plaque de cisaillement (46).
  13. Construction en mer selon la revendication 12, dans laquelle chaque plaque de couplage (48, 50) est soudée à la plaque de cisaillement (46) à la jonction entre les plaques.
  14. Construction en mer selon l'une quelconque des revendications précédentes, dans laquelle la connexion est formée entre le pont (8) et deux desdites cordes de pied (34) situées aux deux extrémités de la face orientée vers l'intérieur des pieds en treillis (6).
  15. Procédé d'installation d'une construction en mer comprenant une base (4), un pont (8) présentant deux bords latéraux sensiblement parallèles, et une pluralité de pieds en treillis (6) situés à l'extérieur des bords latéraux parallèles, chacun desdits pieds en treillis comprenant un corde s'étendant verticalement (34) à chaque coin de ceux-ci, le procédé comprenant les étapes suivantes: installer la base sur le fond de la mer; placer le pont à la hauteur requise en employant des vérins; former une connexion permanente entre le pont et la face orientée vers l'intérieur de chacun des pieds en attachant une plaque de cisaillement s'étendant essentiellement verticalement (46) entre une corde de chaque pied en treillis et le bord du pont; et enlever le système de vérins de la construction.
  16. Procédé d'installation d'une construction en mer selon la revendication 15, dans lequel des guides (14) sont prévus sur le pont (8) pour guider le pont lorsque celui-ci est monté sur les pieds (6).
  17. Procédé d'installation d'une construction en mer selon la revendication 16, comprenant en outre les étapes suivantes: attacher quatre pieds (6) à la base (4); attacher deux guides (14) au pont (8); faire flotter le pont au-dessus de la base de telle sorte qu'il passe entre les pieds jusqu'à ce que les guides viennent buter contre deux desdits pieds; et attacher deux autres guides (14) au pont.
  18. Procédé d'installation d'une construction en mer selon la revendication 16 ou 17, dans lequel les guides (14) comprennent des poutres attachées à et saillant à partir de la surface supérieure du pont (8) et configurées pour engager une corde (34) dudit pied (6).
  19. Procédé d'installation d'une construction en mer selon l'une quelconque des revendications 15 à 18, dans lequel le pont (8) est positionné par rapport aux pieds (6) avant de former la connexion permanente.
  20. Procédé d'installation d'une construction en mer selon la revendication 19, dans lequel le pont (8) est positionné en tirant le pied (6) vers le pont de manière à maintenir la corde de pied (34) contre le guide (14).
  21. Procédé d'installation d'une construction en mer selon la revendication 20, dans lequel un chariot tracteur hydraulique (38) est prévu entre un bord extérieur du pied (6) et le pont (8) de manière à tirer le pied vers le pont.
  22. Procédé d'installation d'une construction en mer selon l'une quelconque des revendications 19 à 21, dans lequel des vérins de support hydrauliques (44) sont prévus à la base du pont (8) de manière à pousser les cordes de pied intérieures (34) à s'écarter du bord de pont inférieur.
  23. Procédé d'installation d'une construction en mer selon l'une quelconque des revendications 20 à 22, dans lequel le pont (8) est tiré vers chacun des pieds (6).
  24. Procédé d'installation d'une construction en mer selon l'une quelconque des revendications 15 à 23, dans lequel la plaque de cisaillement s'étendant essentiellement verticalement (46) est attachée entre une corde (34) du pied en treillis (6) et le bord du pont par soudage.
  25. Procédé d'installation d'une construction en mer selon la revendication 24, dans lequel une plaque de raidissement (52) est prévue à travers un diamètre du pied (6), et un premier bord latéral de ladite plaque de cisaillement (46) est soudé à ladite plaque de raidissement, et ladite plaque de cisaillement et ladite plaque de raidissement sont essentiellement alignées.
  26. Procédé d'installation d'une construction en mer selon la revendication 25, dans lequel la plaque de raidissement (52) s'étend sur une plus grande longueur de la corde de pied (34) que la plaque de cisaillement (46).
  27. Procédé d'installation d'une construction en mer selon la revendication 25 ou 26, dans lequel deux plaques (54, 56) sont soudées au bord du pont sur des côtés respectifs de la plaque de cisaillement (46) et s'étendant vers l'extérieur à partir du bord du pont, et l'extrémité intérieure de ladite plaque de cisaillement est soudée entre les deux plaques.
  28. Procédé d'installation d'une construction en mer selon l'une quelconque des revendications 24 à 27, dans lequel la connexion comprend en outre une plaque de couplage métallique supplémentaire (48, 50) attachée horizontalement entre le pont (8) et la corde de pied (34), la deuxième plaque de couplage métallique comportant une entaille (58) dans un bord opposé à la corde de pied, de telle sorte qu'une partie de la périphérie de la corde de pied soit maintenue à l'intérieur de l'entaille.
  29. Procédé d'installation d'une construction en mer selon la revendication 28, dans lequel l'entaille (58) est de forme elliptique.
  30. Procédé d'installation d'une construction en mer selon la revendication 28 ou 29, dans lequel une plaque de couplage (48, 50) est prévue en haut et en bas de la plaque de cisaillement (46).
  31. Procédé d'installation d'une construction en mer selon l'une quelconque des revendications 28 à 30, dans lequel la plaque de cisaillement (46) et la plaque de couplage (48, 50) sont soudées l'une à l'autre.
EP99950974A 1998-10-26 1999-10-25 Construction en mer Expired - Lifetime EP1129258B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9823427A GB2343150B (en) 1998-10-26 1998-10-26 Offshore structure
GB9823427 1998-10-26
PCT/GB1999/003521 WO2000024972A1 (fr) 1998-10-26 1999-10-25 Construction en mer

Publications (2)

Publication Number Publication Date
EP1129258A1 EP1129258A1 (fr) 2001-09-05
EP1129258B1 true EP1129258B1 (fr) 2007-01-10

Family

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Application Number Title Priority Date Filing Date
EP99950974A Expired - Lifetime EP1129258B1 (fr) 1998-10-26 1999-10-25 Construction en mer

Country Status (4)

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EP (1) EP1129258B1 (fr)
AU (1) AU6356099A (fr)
GB (1) GB2343150B (fr)
WO (1) WO2000024972A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013027870A1 (fr) * 2011-08-22 2013-02-28 에스티엑스(대련)해양중공유한회사 Procédé pour construire une plateforme sur vérins sans l'utilisation d'une grue
CN102400454B (zh) * 2011-11-11 2013-09-04 武汉船用机械有限责任公司 一种海洋平台的升降自动控制方法与自动控制装置
CN103572744B (zh) * 2013-10-11 2015-12-02 武汉船用机械有限责任公司 一种升降平台

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343371A (en) * 1965-01-25 1967-09-26 Mcdermott & Co Inc J Ray Locking device for establishing a loadbearing joint between two structures
US3385069A (en) * 1966-10-07 1968-05-28 Bethlchem Steel Corp Mobile marine platform apparatus
US3974657A (en) * 1972-04-13 1976-08-17 Sumner Maurice N Modular offshore structure system
US4040265A (en) * 1976-02-06 1977-08-09 Marine Engineering Systems, Inc. Mobile offshore platform
US4266887A (en) * 1977-06-10 1981-05-12 Brown & Root, Inc. Self-elevating fixed platform
US4722640A (en) * 1978-05-30 1988-02-02 Letourneau Richard L Slant leg offshore platform and method of operating same
DE2930203A1 (de) * 1979-07-25 1981-02-19 Thiele Heinrich Unterkonstruktion fuer ein unterwasserbauwerk
GB9726277D0 (en) * 1997-12-11 1998-02-11 Kvaerner Oil & Gas Ltd Method of forming a substructure for an offshore platform

Also Published As

Publication number Publication date
GB2343150A (en) 2000-05-03
GB2343150B (en) 2002-05-15
GB9823427D0 (en) 1998-12-23
EP1129258A1 (fr) 2001-09-05
WO2000024972A1 (fr) 2000-05-04
AU6356099A (en) 2000-05-15

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