EP0065695B1 - Jambe d'une plate-forme marine et procédé de mise en place de la plate-forme - Google Patents

Jambe d'une plate-forme marine et procédé de mise en place de la plate-forme Download PDF

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Publication number
EP0065695B1
EP0065695B1 EP82104068A EP82104068A EP0065695B1 EP 0065695 B1 EP0065695 B1 EP 0065695B1 EP 82104068 A EP82104068 A EP 82104068A EP 82104068 A EP82104068 A EP 82104068A EP 0065695 B1 EP0065695 B1 EP 0065695B1
Authority
EP
European Patent Office
Prior art keywords
leg
insert
platform
barge
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
Application number
EP82104068A
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German (de)
English (en)
French (fr)
Other versions
EP0065695A1 (fr
Inventor
Jean-Louis Ninet
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.)
Alsthom Atlantique SA
Original Assignee
Alsthom Atlantique SA
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 Alsthom Atlantique SA filed Critical Alsthom Atlantique SA
Publication of EP0065695A1 publication Critical patent/EP0065695A1/fr
Application granted granted Critical
Publication of EP0065695B1 publication Critical patent/EP0065695B1/fr
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
    • E02B17/024—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 shock absorbing means for the supporting construction

Definitions

  • the invention applies to any platform intended to be placed at sea on a fixed structure pre-installed and which is therefore subject, at the time of its installation, to the action of the swell.
  • the platform transported from its place of construction on a transport barge, comprises legs which, at the end of the operation, must rest on determined locations on the structure (generally piles which protrude from the surface of the water ) and be secured to this structure, most generally by welding.
  • This operation is easily carried out in the river or in a site protected from swell by simple ballasting of the transport barge.
  • the swell is not regular, but has waves trains interspersed with periods of relative calm, it is imperative to have a system to ensure the connection in the horizontal plane between platform and structure in a time less than the duration of the periods of calm, that is to say, in the majority of cases, less than one minute.
  • a classic solution is to suspend the platform at the end of a crane carried by a barge and drop it suddenly, at the time of the coincidence between the piles of the structure and the legs of the platform. Crane operators are skilled enough to succeed in this maneuver.
  • An object of the invention is therefore to define a device making it possible to achieve a beautiful manner. more economical blow an almost instantaneous connection between a platform equipped with legs and the heads of the piles of a fixed structure intended to receive the platform.
  • the subject of the invention is a leg of a marine platform engaging on a pile belonging to a fixed structure and the head of which has a receiving cone, said platform having legs equal in number to the piles, each leg being intended to be fixed to a stack, said leg being hollow and enclosing an insert which can slide in the leg and intended to secure the leg and the corresponding stack by its partial introduction into the receiving cone, characterized in that the insert is associated to a means which makes it possible to secure it to the leg and to detach it suddenly, causing the insert to fall by gravity.
  • the means comprises at least one finger passing through the leg and cooperating with a bore of the insert.
  • a wedge crossing the leg above the insert is inserted into each of the legs concerned by holes facing two by two.
  • FIG. 1 A schematically represents a platform 1 carried by a transport barge 2.
  • This structure includes piles whose heads can emerge from the water; one of these battery heads, referenced 4, is shown in the figures. It has a receiving cone 5, female.
  • Each stack 4 corresponds to a leg 6 secured to the platform 1.
  • a platform may for example include four legs which will be secured to 4 stacks.
  • At least two of the legs consist of a hollow cylinder closed at the upper end by a stop 7 generally called a lifter. It is legs of this type which are shown in the figures.
  • the transport barge is positioned using anchor lines, the platform and its legs passing freely above the pile heads.
  • the distance (or clear) between the lower end of the insert and the pile head depends on the tide, the amplitude of the barge's vertical movements and certain factors of security. This value is designated by AGo.
  • the transport barge / platform assembly being positioned using the anchor lines oscillates, due to the swell, around an average position of perfect coincidence between stacks and legs.
  • the transport barge is first ballasted until the clear AGo is reduced to a minimum value compatible with the vertical movements of the assembly and in such a way that there is no contact between pile head and leg of the platform. This is the position shown in fig. 1 A.
  • inserts are released simultaneously and fall into the cones of reception of the battery heads, instantly making the horizontal connection between the plate -form and structure.
  • the number of inserts to be dropped simultaneously depends on their capacity and that of the piers of the structure to withstand the horizontal forces generated by the wave trains. Their number is at least two to avoid any rotation of the platform which could occur after connection on a single insert and which would prevent the others from going down into the receiving cones.
  • the barge / platform assembly remains free to move vertically with the swell, along the insert.
  • the depth of the reception cone will advantageously be taken at least equal to the value of the maximum possible heaving to prevent any accidental dislodging of an insert after connection by friction of the insert inside the leg, at the moment of the passage of wave trains.
  • the receiving cone can advantageously be mounted on a damper 14 made of rubber, elastomer or any other suitable elastic material, to absorb the shock created by the fall of the insert and to ensure that the latter does not damage the battery head of the structure, if the centering of the platform is not perfect when the inserts are released.
  • Fig. 1 D shows the crushing of the shock absorber at the end of ballasting.
  • the length of the insert and the location of the spreader inside the leg are studied so that the distance, at the end of the operation, between the lower end of the platform leg and the head of the structure's stack is sufficient to allow two metal half-ferrules (16A and 16B) to be welded, which ultimately provide continuity of the structure installed between the stack and the leg of the platform.
  • the shock absorber can then be destroyed, for example by chemical action (fig. 1 E).
  • the relief height D is close to 2 m. If the initial clear is 0.6 m and the heaving 0.9 m, the ballasting height is close to 4 m; ballasting then requires a very large quantity of water, of the order of 13,000 tonnes.
  • a variant of the system makes it possible to reduce this ballasting height; this variant will preferably apply to very large platforms.
  • the variant is based on the following consideration:
  • Figs. 2A to 2E represent the variant of the device of the invention using this wedge.
  • the leg is provided with orifices 20A, 20B, 21 A facing two by two.
  • a shim 19 is introduced by a pair of orifices (here the orifices 21 A, 21 B lower), so as to serve as a stop for the insert at the end of ballasting (fig. 2D).
  • Fig. 2E shows the final position of the various elements after welding of two half-ferrules 16A and 16B and destruction of the shock absorber.
  • the wedge is mounted on a slide (not shown) which crosses the leg of the platform so as not to impede the sliding of the insert - passing, for example, on either side of the insert to the inside of the leg - and is extended to the outside of the leg where the wedge is in the waiting position before connection.
  • the introduction of the wedge inside the leg can be carried out manually or using a mechanical device such as for example a jack (not shown) whose required capacity is limited to the value of the friction due to the dead weight of the hold.
  • a mechanical device such as for example a jack (not shown) whose required capacity is limited to the value of the friction due to the dead weight of the hold.
  • An additional advantage of this variant lies in the fact that, after dropping the inserts, the resumption of the horizontal forces due to the swell induces smaller moments in the inserts, the distance between the bottom of the reception cone and the guide 9 mounted at the lower end of the leg being reduced, relative to the device of FIGS. 1A to 1 E, of a length equal to that of the protrusion of the insert under the leg; this length can reach 1.5 m.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Beans For Foods Or Fodder (AREA)
  • Soy Sauces And Products Related Thereto (AREA)
  • Revetment (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
EP82104068A 1981-05-15 1982-05-11 Jambe d'une plate-forme marine et procédé de mise en place de la plate-forme Expired EP0065695B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8109708A FR2505900A1 (fr) 1981-05-15 1981-05-15 Dispositif pour la mise en place d'une plate-forme et procede d'utilisation dudit dispositif
FR8109708 1981-05-15

Publications (2)

Publication Number Publication Date
EP0065695A1 EP0065695A1 (fr) 1982-12-01
EP0065695B1 true EP0065695B1 (fr) 1985-02-06

Family

ID=9258500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104068A Expired EP0065695B1 (fr) 1981-05-15 1982-05-11 Jambe d'une plate-forme marine et procédé de mise en place de la plate-forme

Country Status (6)

Country Link
US (1) US4413926A (no)
EP (1) EP0065695B1 (no)
JP (1) JPS57193619A (no)
DE (1) DE3262205D1 (no)
FR (1) FR2505900A1 (no)
NO (1) NO155783C (no)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5992746U (ja) * 1982-12-10 1984-06-23 日立造船株式会社 プラントモジユ−ル据付装置
GB8522975D0 (en) * 1985-09-17 1985-10-23 Conoco Uk Ltd Offshore platforms
DK46186A (da) * 1985-02-01 1986-08-02 Conoco Uk Ltd Fremgangsmaade og udstyr til samling af en offshoreplatforms daek og underdel
US4669918A (en) * 1986-02-04 1987-06-02 Riles William G Offshore platform construction including preinstallation of pilings
JPS6336462A (ja) * 1986-07-31 1988-02-17 Pfu Ltd シリアル・デ−タ受信回路
US4848967A (en) * 1988-01-04 1989-07-18 Exxon Production Research Company Load-transfer system for mating an integrated deck with an offshore platform substructure
US4930938A (en) * 1989-06-02 1990-06-05 Exxon Production Research Company Offshore platform deck/jacket mating system and method
US5445476A (en) * 1993-09-30 1995-08-29 Shell Oil Company Reusable offshore platform jacket
US5447391A (en) * 1993-09-30 1995-09-05 Shell Oil Company Offshore platform structure and system
US5431512A (en) * 1993-12-28 1995-07-11 Mcdermott International, Inc. Flex tube compliant offshore structure
GB2302119B (en) 1994-05-02 1998-02-18 Shell Int Research A method for templateless foundation installation of a tlp
US5593250A (en) * 1994-12-23 1997-01-14 Shell Offshore Inc. Hyjack platform with buoyant rig supplemental support
US5741089A (en) * 1994-12-23 1998-04-21 Shell Offshore Inc. Method for enhanced redeployability of hyjack platforms
US5551801A (en) * 1994-12-23 1996-09-03 Shell Offshore Inc. Hyjack platform with compensated dynamic response
US20100316450A1 (en) * 2007-12-21 2010-12-16 Vestas Wind Systems A/S Method for installing an offshore wind turbine and a barge system
US8926225B2 (en) * 2013-03-18 2015-01-06 J. Ray Mcdermott, S.A. Leg mating unit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736756A (en) * 1971-11-03 1973-06-05 Exxon Co Method and apparatus for assembling an offshore structure
US3826099A (en) * 1972-09-25 1974-07-30 Eng Technology Analysts Inc Self-elevating offshore platform with folding legs
US3895471A (en) * 1974-04-09 1975-07-22 Brown & Root Method and apparatus for forming elongated batter piling in situ
US4090367A (en) * 1976-04-06 1978-05-23 Verschure Pietrus J M Offshore drilling platform with vertically movable legs
NO771673L (no) * 1976-05-20 1977-11-22 Pool Co Fast offshore-plattform samt fremgangsm}te ved oppstilling av samme
DE2736938C2 (de) * 1977-08-16 1979-03-15 Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel Meeres-Hubinsel
NL7806612A (nl) * 1977-09-21 1979-03-23 Babcock Ag Zeeplatform.
US4252469A (en) * 1978-04-03 1981-02-24 Brown & Root, Inc. Method and apparatus for installing integrated deck structure and rapidly separating same from supporting barge means
FR2496730A1 (fr) * 1980-12-23 1982-06-25 Bretagne Atel Chantiers Dispositif pour la mise en place d'une plate-forme marine sur sa structure support

Also Published As

Publication number Publication date
NO155783C (no) 1987-05-27
DE3262205D1 (en) 1985-03-21
FR2505900A1 (fr) 1982-11-19
JPS6130086B2 (no) 1986-07-11
NO821592L (no) 1982-11-16
EP0065695A1 (fr) 1982-12-01
NO155783B (no) 1987-02-16
JPS57193619A (en) 1982-11-29
FR2505900B1 (no) 1984-10-26
US4413926A (en) 1983-11-08

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