EP1487693B1 - Structure for the transport, installation and dismantlement of a bridge of a fixed oil platform and method for implementing said structure - Google Patents

Structure for the transport, installation and dismantlement of a bridge of a fixed oil platform and method for implementing said structure Download PDF

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Publication number
EP1487693B1
EP1487693B1 EP03722695A EP03722695A EP1487693B1 EP 1487693 B1 EP1487693 B1 EP 1487693B1 EP 03722695 A EP03722695 A EP 03722695A EP 03722695 A EP03722695 A EP 03722695A EP 1487693 B1 EP1487693 B1 EP 1487693B1
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EP
European Patent Office
Prior art keywords
hull
deck
travelling block
bridge
raising
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
EP03722695A
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German (de)
French (fr)
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EP1487693A1 (en
Inventor
Pierre-Armand Thomas
Pal Teien
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Technip Energies France SAS
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Technip France SAS
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Publication date
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Publication of EP1487693A1 publication Critical patent/EP1487693A1/en
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Publication of EP1487693B1 publication Critical patent/EP1487693B1/en
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
    • E02B17/0818—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with racks actuated by pinions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPINGĀ 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/003—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for for transporting very large loads, e.g. offshore structure modules
    • 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
    • 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
    • E02B2017/0052—Removal or dismantling of offshore structures from their offshore location
    • 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
    • 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 present invention relates to a structure for transporting, installing and dismantling a bridge of a fixed offshore oil platform. It also relates to a method for transporting, installing and dismantling a bridge of a fixed oil platform.
  • a fixed oil platform that includes a bridge including operating equipment and living quarters.
  • the bridge is supported by a support column anchored on the sea floor.
  • the first method is to use lifting cranes mounted on barges to transfer the deck of the platform of the transport boat to a superstructure consisting of a support column. This method, which until now is the most widespread, has limitations.
  • the first of these limitations is the capacity of the hoisting cranes which can impose to realize the bridge in several elements which significantly increases the manufacturing cost of this bridge and the cost of the installation and dismantling of said bridge of the oil rig.
  • the second limitation lies in the fact that this method requires to have a relatively large window of time to be able to carry out this operation at sea in good conditions.
  • the second method is to install the oil rig deck as a single block on the support column by floating it above of it. Then, the bridge is disposed on this support column either by a ballast / deballasting system, or by a mechanical system.
  • US 5855455 discloses such a system.
  • the deck of the platform is supported either by a floating support constituted for example by a barge, pontoons or by a U-shaped floating support, or by means of a structure associated with this floating support.
  • the superstructure can be ballasted or unballasted
  • the superstructure having a large ballast capacity, the dismantling operation can proceed relatively quickly.
  • the deballasting capacity of the floating support may be used. This capacity being limited, the operation proceeds slowly.
  • ballasting / deballasting system is the use of a mechanical system to raise or lower the deck of the oil platform. These systems make it possible to carry out the installation or dismantling operation of the deck of the oil platform faster than the systems mentioned above.
  • Another mechanical system consists of a rack and pinion system to raise or lower the deck of the oil platform.
  • the object of the invention is to avoid these drawbacks by proposing a structure for transporting, installing or dismantling a bridge of a fixed oil platform which is designed to facilitate the different operations while allowing to save a lot of time and to avoid any risk of environmental pollution and to increase the security of the personnel responsible for carrying out the various operations.
  • FIG 1 there is shown schematically a fixed oil platform generally designated by reference 1 and comprising a bridge 2 provided with the usual operating equipment and living quarters.
  • This bridge 2 is mounted on a support column 3 whose base is anchored on the seabed 4 by anchoring members 5.
  • the structure 10 comprises a floating hull 11 in the shape of a U equipped with lifting legs 12 of this hull 11 and adapted to bear on the seabed.
  • the shell 11 has two lateral portions 11a and a connecting portion 11b connecting the two side portions 11a.
  • the shell 11 is equipped with four lifting legs 12 arranged in pairs on each lateral branch 11a of said shell 11.
  • the shell 11 may be equipped with three lifting legs 12 distributed in a triangle, a leg 12 being placed on each side portion 11a and a leg 12 being placed on the connecting portion 11b.
  • Each leg 12 ends at its lower end by a shoe 13 intended to bear on the seabed 4.
  • each of these legs 12 has, in this embodiment, a triangular section. These legs 12 may also have a square or circular section.
  • Each leg 12 is formed of three ribs 14 interconnected by a lattice of metal beams 15.
  • Each leg 12 is associated with mechanical means of displacement designated by the general reference 20 ( Figures 3 and 4).
  • the mechanical displacement means 20 are housed in a supporting frame 16, also called by the "jack-houseā€ specialists, which is supported by the shell 11.
  • the mechanical displacement means 20 of each leg 12 comprise, on the one hand, two opposite plates 21 each carried by a rib 14 of the corresponding leg 12 and each comprising, on each lateral face , a series of teeth 22 forming on the two ribs 14 a double rack.
  • the mechanical displacement means 20 also comprise several sets 25 distributed on either side of each plate 21, according to the height thereof.
  • Each set 25 comprises a geared motor unit 26 for driving a pinion 27 which meshes with a series of teeth 22 of the corresponding plate 21.
  • the two sets of teeth 22 of each plate 21 are associated with eight pinions 27 each rotated by a geared motor unit 26.
  • the structure 10 also comprises a shuttle designated by the general reference 30 which is movable along the legs 12 by the shell 11 and which is intended to be applied on the underside of the deck 2 of the oil platform 1, as it is will see later.
  • the shuttle 30 is composed of independent elements 31 the number of which corresponds to the number of legs 12 of the structure 10.
  • the shuttle 30 consists of four independent elements 31, each associated with a lifting leg 12.
  • the shuttle 30 may also consist of a frame-shaped element supported by the lifting legs 12 by means of the mechanical displacement means 20.
  • the element 31 comprises a vertical leg 32 for positioning on a lateral face of the supporting framework 16 of the shell 11 and a horizontal support leg 33 of the bridge 2 during its transport.
  • the vertical branch 32 comprises guide means on the corresponding leg 12 and locking means on this leg 12.
  • the guide means are formed by two opposite flanges 34 formed at the upper part of the vertical branch 32 and extending parallel to the horizontal branch 33 of the element 31.
  • Each flange 34 determines with said vertical branch 32 a housing 35 for a plate 21 of the corresponding leg 12.
  • each element 31 is guided on the corresponding leg 12 by the plates 21.
  • each element 31 are formed, as represented in FIG. 6, by at least one counter-rack 36 and, preferably, by at least one counter-rack 36 for each plate 21.
  • the counter-rack 36 is displaceable by at least one actuating member 37 and, preferably, by two actuating members 37 constituted for example by hydraulic or pneumatic cylinders in order to move the counter-rack 36 between a retracted position and a locking position in engagement on one of the series of teeth 22 of the corresponding leg 12.
  • the assembly constituted by the counter-rack 36 and the actuating members 37 is carried by the element 31 by means of suitable fasteners, not shown.
  • each element 31 of the shuttle 30 is provided with lateral stabilization members of the bridge 2 in the support position of this bridge 2 and which are formed by at least one hydraulic or pneumatic cylinder 38 with horizontal displacement arranged for example in the vertical branch 32 of said element 31.
  • each element 31 is provided with two slides 39 each extending vertically along a lateral edge of the vertical branch 32.
  • Each slide 39 cooperates with a vertical slide 40 fixed on the frame 16 at each lifting leg 12.
  • the slides 39 and 40 are provided on their faces facing a sliding lining formed for example by a "Teflon" gasket.
  • each element 31 comprises, on its upper face, resilient members 41 for supporting the bridge 2 of the oil platform 1.
  • These elastic members 41 are constituted for example by elastomer blocks or by example by airbags or by any other appropriate system.
  • the shell 11 is provided on its upper face with rails 42 extending in the same direction as the lateral portions 11a of said shell 11 and which allow the horizontal sliding of the bridge 2 when the latter has previously placed on said shell 11 between the support position on the elements 31 of the shuttle 30 and a storage position outside the structure 11, as for example on the dock of a port to allow disassembly of the bridge 2 in all safety for the personnel or vice versa ie the transfer of the bridge 2 of the wharf on the elements 31 of the shuttle 30 for the transport of this bridge 2 to the operating site.
  • the shell 11 comprises, at its open portion, a door 43 formed for example of two leaves 44 movable between an open position for the positioning of the structure 10 below the bridge 2 and a closed position during the transfer said bridge 2 by the structure 10.
  • the transport of the bridge 2 by the structure 10 between the operating site and a dock of a port is carried out as follows.
  • the structure 10, with the leaves 44 in the open position is floated below the deck 2 of the platform 1 by positioning the support column 3 of the deck 2 in the U-shaped space formed between the lateral portions 11a of the shell 11. During this positioning, the lifting legs 12 are in the retracted position so that the shoes 13 are arranged below the hull 11. The elements 31 of the shuttle 30 are applied against the shell 11, as shown in particular in FIG. 2.
  • the geared motor units 26 are actuated to drive in rotation the pinions 27 which mesh with the series of teeth 22 of the plates 21 of each lifting leg 12 in order to bring the shoes 13 in contact with the seabed 4.
  • the support column 3 is separated from the bridge 2 for example by cutting the rods of this support column and the assembly constituted by the shell 11, the shuttle 30 and the bridge 2 is raised to separate the bridge 2 of the column support 3 which remains in a vertical position, as shown in FIG. 7C.
  • the hull 11 is floated by the drive in the opposite direction of the pinions 27 which mesh with the series of teeth 22 (Figure 7D) and the pinions 27 are always rotated, which causes, by reaction due to the depression of the hull 11 in the water, the lifting of the lifting legs 12 (FIG. 7E), which makes it possible to releasing the shell 11 supporting the bridge 2 via the shuttle 30 of the operating site on which the support column 3 is still in place, as shown in Figure 7F.
  • the hull 11 supporting the deck 2 is floated ( Figure 71) to a dock of a port ( Figure 7J) and the lifting legs 12 are applied on the bottom to stabilize the hull 11.
  • the cylinders 38 are retracted and a connecting piece 6 is placed between the shell 11 and the dock to ensure continuity between the surface of the shell 11 and said dock. Then, the bridge 2 is unloaded on this platform by for example sliding on the rails 42.
  • the transport structure 10 is floated near the dock and the lifting legs 12 are applied to the bottom to stabilize the hull 11.
  • the connection between the surface of the hull 11 and the dock is provided by the part 6 and the bridge 2 is transferred from the platform to the elements 31 of the shuttle 30 by sliding it on the rails 42.
  • the structure 10 supporting the deck 2 is flown to the vicinity of the operating site and the lifting legs 12 are applied to the seabed so as to lift the deck 2 by means of the hull 11 and the shuttle 30.
  • the elements 31 of the shuttle 30 are locked on the lifting legs 12 by means of the counter-racks 36 which are actuated by the jacks 37 so that these counter-racks 36 engage with the adjacent teeth 22 and thereby locking each element 31 of the shuttle 30 on the lifting legs 12.
  • the hull 11 is floated and the legs 12 of the structure 11 are raised.
  • the bridge 2 is brought above the support column 3 of the oil platform 1 and the lifting legs 12 of the structure 10 are again applied to the seabed.
  • the shell 11 is raised to bring it into contact with the elements 31 of the shuttle 30 and these elements 31 are unlocked, then the shell 11, the shuttle 30 and the bridge 2 are lowered in order to put the bridge 2 on the support column 3 .
  • the bridge 2 is fixed on the support column 3 and the hull 11 and the shuttle 30 are lowered to bring said hull 11 floating, then the lifting legs 12 raised.
  • the structure 10 is then removed from the operating site.
  • the structure according to the invention has the advantage of being able to transport the entire deck of the oil platform directly from the operating site to a fixed site where its dismantling can be carried out safely, without risk of pollution of the environment. marine or conversely between a fixed site and an exploitation site where the bridge is fixed on its support column.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Ship Loading And Unloading (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

A U-shaped floating hull (11) carries three or more mechanically-driven lifting legs (12) capable of resting on the sea bed. A shuttle (30) is moved along the legs by the hull. It is applied to the lower face of the bridge to support it. The shuttle has a system capable of locking it to the legs. A rack and pinion drive moves each shuttle component along the leg. Each of the three shuttle components (31) associated with a lifting leg, has guides with lateral stabilizers for positioning and supporting the bridge. Each shuttle has a vertical positioning section on the hull. Guidance and locking are provided. A horizontal section supports the bridge. Guides are formed by opposite edges, forming a housing with the vertical section, for a plate of the corresponding lifting leg. The locking system comprises actuated counter-rack sections, which lock into teeth of the rack on the leg. The stabilizers are hydraulic- or pneumatic brakes with horizontal displacement. The horizontal sections on the shuttle have resilient components on which the bridge is rested. A system of horizontal slide rails is included for the bridge. These allow it to be moved from a position of support on the shuttle systems, to a remote position away from them. A door (43, 44) in the hull can be opened for positioning and closed during bridge transport. An Independent claim is included for the dismounting and transport of the bridge.

Description

La prĆ©sente invention concerne une structure de transport, d'installation et de dĆ©mantĆØlement d'un pont d'une plate-forme pĆ©troliĆØre fixe d'exploitation en mer. Elle concerne en outre un procĆ©dĆ© de transport, d'installation et de dĆ©mantĆØlement d'un pont d'une plate-forme pĆ©troliĆØre fixe.The present invention relates to a structure for transporting, installing and dismantling a bridge of a fixed offshore oil platform. It also relates to a method for transporting, installing and dismantling a bridge of a fixed oil platform.

Pour l'exploitation pĆ©troliĆØre, il est connu de placer au-dessus d'un gisement pĆ©trolifĆØre, une plate-forme pĆ©troliĆØre fixe qui comprend un pont portant notamment les Ć©quipements d'exploitation et les locaux d'habitation. Le pont est soutenu par une colonne support ancrĆ©e sur le sol marin.For oil exploitation, it is known to place above a petroleum field, a fixed oil platform that includes a bridge including operating equipment and living quarters. The bridge is supported by a support column anchored on the sea floor.

Jusqu'Ć  prĆ©sent, il existe deux grandes mĆ©thodes de transport, d'installation et de dĆ©mantĆØlement d'un pont d'une plate-forme pĆ©troliĆØre fixe.So far, there are two main methods of transporting, installing and dismantling a bridge of a fixed oil platform.

La premiĆØre mĆ©thode consiste Ć  utiliser des grues de levage montĆ©es sur des barges pour transfĆ©rer le pont de la plate-forme du bateau de transport sur une superstructure constituĆ©e d'une colonne support. Cette mĆ©thode qui est jusqu'Ć  maintenant la plus rĆ©pandue prĆ©sente des limitations.The first method is to use lifting cranes mounted on barges to transfer the deck of the platform of the transport boat to a superstructure consisting of a support column. This method, which until now is the most widespread, has limitations.

En effet, la premiĆØre de ces limitations est la capacitĆ© des grues de levage qui peut imposer de rĆ©aliser le pont en plusieurs Ć©lĆ©ments ce qui augmente de maniĆØre importante le coĆ»t de fabrication de ce pont et le coĆ»t de l'installation et du dĆ©mantĆØlement dudit pont de la plate-forme pĆ©troliĆØre.Indeed, the first of these limitations is the capacity of the hoisting cranes which can impose to realize the bridge in several elements which significantly increases the manufacturing cost of this bridge and the cost of the installation and dismantling of said bridge of the oil rig.

La seconde limitation rĆ©side dans le fait que cette mĆ©thode impose d'avoir une fenĆŖtre de temps favorable relativement importante pour pouvoir rĆ©aliser cette opĆ©ration en mer dans de bonnes conditions.The second limitation lies in the fact that this method requires to have a relatively large window of time to be able to carry out this operation at sea in good conditions.

Ainsi, cette mĆ©thode est difficilement applicable sans une augmentation considĆ©rable du coĆ»t dans des zones oĆ¹ les fenĆŖtres de temps sont relativement courtes, comme par exemple la mer du Nord.Thus, this method is difficult to apply without a considerable increase in cost in areas where windows of time are relatively short, such as the North Sea.

La deuxiĆØme mĆ©thode consiste Ć  installer le pont de la plate-forme pĆ©troliĆØre en un seul bloc sur la colonne support en le faisant flotter au-dessus de celle-ci. Ensuite, le pont est disposĆ© sur cette colonne support soit par un systĆØme de ballastage/dĆ©ballastage, soit par un systĆØme mĆ©canique.The second method is to install the oil rig deck as a single block on the support column by floating it above of it. Then, the bridge is disposed on this support column either by a ballast / deballasting system, or by a mechanical system.

Le document US 5855455 dĆ©crit un tel systĆØme.US 5855455 discloses such a system.

Dans le cas d'un systĆØme de ballastage, le pont de la plate-forme est supportĆ© soit par un support flottant constituĆ© par exemple par une barge, des pontons ou par un support flottant en forme de U, soit par l'intermĆ©diaire d'une structure associĆ©e Ć  ce support flottant.In the case of a ballast system, the deck of the platform is supported either by a floating support constituted for example by a barge, pontoons or by a U-shaped floating support, or by means of a structure associated with this floating support.

Dans le cas oĆ¹ la superstructure peut ĆŖtre ballastĆ©e ou dĆ©ballastĆ©e, il est connu d'utiliser pour le dĆ©mantĆØlement du pont de la plate-forme pĆ©troliĆØre, le dĆ©ballastage du support flottant et le ballastage de la superstructure. La superstructure ayant une grande capacitĆ© de ballastage, l'opĆ©ration de dĆ©mantĆØlement peut se dĆ©rouler relativement rapidement. Dans le cas d'une superstructure ancrĆ©e sur le fond marin, seule la capacitĆ© de dĆ©ballastage du support flottant peut ĆŖtre utilisĆ©e. Cette capacitĆ© Ć©tant limitĆ©e, l'opĆ©ration se dĆ©roule lentement.In the case where the superstructure can be ballasted or unballasted, it is known to use for the dismantling of the deck of the oil platform, the deballasting of the floating support and the ballasting of the superstructure. The superstructure having a large ballast capacity, the dismantling operation can proceed relatively quickly. In the case of a superstructure anchored to the seabed, only the deballasting capacity of the floating support may be used. This capacity being limited, the operation proceeds slowly.

Les systĆØmes utilisant le ballastage ou le dĆ©ballastage prĆ©sentent des inconvĆ©nients qui rĆ©sident principalement dans le fait qu'ils imposent une structure complexe au niveau des caissons ou des pompes et un contrĆ“le trĆØs prĆ©cis de remplissage et de vidage des caissons pour maintenir la stabilitĆ© du support flottant pendant l'opĆ©ration. La vitesse de l'opĆ©ration dĆ©pend de la capacitĆ© de ballastage et de dĆ©lestage de ces caissons des supports flottants qui est gĆ©nĆ©ralement relativement faible si bien que la vitesse de l'opĆ©ration s'en trouve limitĆ©e notamment lorsque la superstructure est ancrĆ©e sur le fond marin. De plus, au cours de cette opĆ©ration, les conditions de mer doivent ĆŖtre favorables afin d'effectuer cette opĆ©ration dans de bonnes conditions.Systems using ballasting or deballasting have drawbacks which mainly lie in the fact that they impose a complex structure on the caissons or pumps and a very precise control of filling and emptying of the boxes to maintain the stability of the floating support during the operation. The speed of the operation depends on the ballast capacity and load shedding of these caissons floating supports which is generally relatively low so that the speed of the operation is limited especially when the superstructure is anchored to the seabed . In addition, during this operation, the sea conditions must be favorable to perform this operation in good conditions.

Une alternative au systĆØme de ballastage/dĆ©ballastage est l'utilisation d'un systĆØme mĆ©canique pour monter ou abaisser le pont de la plate-forme pĆ©troliĆØre. Ces systĆØmes permettent de rĆ©aliser l'opĆ©ration d'installation ou de dĆ©mantĆØlement du pont de la plate-forme pĆ©troliĆØre plus rapidement que les systĆØmes prĆ©cĆ©demment mentionnĆ©s.An alternative to the ballasting / deballasting system is the use of a mechanical system to raise or lower the deck of the oil platform. These systems make it possible to carry out the installation or dismantling operation of the deck of the oil platform faster than the systems mentioned above.

A cet effet, il est connu un systĆØme qui comprend deux barges supportant le pont de la plate-forme pĆ©troliĆØre par l'intermĆ©diaire de deux structures pivotantes. De plus, un systĆØme de treuils et cĆ¢bles est utilisĆ© pour assurer la stabilitĆ© du systĆØme et contrĆ“ler la descente et la montĆ©e du pont de la plate-forme pĆ©troliĆØre.For this purpose, it is known a system that includes two barges supporting the deck of the oil platform through two pivoting structures. In addition, a system of winches and cables is used to ensure stability of the system and control the descent and ascent of the deck of the oil platform.

En actionnant ces treuils, on contrĆ“le l'Ć©loignement des barges permettant ainsi la montĆ©e ou la descente du pont. Mais, ce type de systĆØme mĆ©canique prĆ©sente une stabilitĆ© trĆØs prĆ©caire et il est bien souvent incompatible avec une utilisation en pleine mer.By operating these winches, it controls the removal of the barges allowing the rise or the descent of the bridge. But, this type of mechanical system has a very precarious stability and it is often incompatible with use on the high seas.

Un autre systĆØme mĆ©canique consiste en un systĆØme de pignons crĆ©maillĆØre pour monter ou descendre le pont de la plate-forme pĆ©troliĆØre.Another mechanical system consists of a rack and pinion system to raise or lower the deck of the oil platform.

D'une maniĆØre gĆ©nĆ©rale les systĆØmes mĆ©caniques utilisĆ©s jusqu'Ć  prĆ©sent pour rĆ©aliser l'installation et le dĆ©mantĆØlement d'un pont d'une plate-forme pĆ©troliĆØre sont plus rapides que les systĆØmes de ballastage ou dĆ©ballastage, mais ils dĆ©pendent des conditions de mer ce qui rend difficile leur utilisation dans des zones oĆ¹ les fenĆŖtres de temps favorables sont relativement courtes.In general, the mechanical systems used to date for the installation and dismantling of a deck of an oil rig are faster than ballasting or deballasting systems, but they depend on the sea conditions This makes it difficult to use in areas where favorable weather windows are relatively short.

L'invention a pour but d'Ć©viter ces inconvĆ©nients en proposant une structure de transport, d'installation ou de dĆ©mantĆØlement d'un pont d'une plate-forme pĆ©troliĆØre fixe qui est conƧu pour faciliter les diffĆ©rentes opĆ©rations, tout en permettant d'obtenir un gain de temps important et d'Ć©viter tous risques de pollution de l'environnement et d'augmenter la sĆ©curitĆ© du personnel chargĆ© d'effectuer les diffĆ©rentes opĆ©rations.The object of the invention is to avoid these drawbacks by proposing a structure for transporting, installing or dismantling a bridge of a fixed oil platform which is designed to facilitate the different operations while allowing to save a lot of time and to avoid any risk of environmental pollution and to increase the security of the personnel responsible for carrying out the various operations.

A cet effet, l'invention a pour objet une structure de transport, d'installation et de dĆ©mantĆØlement d'un pont d'une plate-forme pĆ©troliĆØre fixe d'exploitation en mer, caractĆ©risĆ©e en ce qu'elle comporte :

  • une coque flottante en forme de U Ć©quipĆ©e d'au moins trois jambes de levage de cette coque et adaptĆ©e pour prendre appui sur le fond marin, chaque jambe Ć©tant associĆ©e Ć  des moyens mĆ©caniques de dĆ©placement, et
  • une navette dĆ©plaƧable le long desdites jambes par la coque et destinĆ©e Ć  ĆŖtre appliquĆ©e sur la face infĆ©rieure du pont dans une position de support dudit pont, ladite navette Ć©tant munie de moyens de verrouillage sur les jambes.
To this end, the subject of the invention is a structure for transporting, installing and dismantling a bridge of a fixed oil platform for offshore operation, characterized in that it comprises:
  • a U-shaped floating hull equipped with at least three lifting legs of this hull and adapted to bear on the seabed, each leg being associated with mechanical means of displacement, and
  • a shuttle movable along said legs by the shell and intended to be applied on the underside of the bridge in a support position of said bridge, said shuttle being provided with locking means on the legs.

Suivant des modes particuliers de mise en oeuvre :

  • les moyens mĆ©caniques de dĆ©placement comprennent, d'une part, deux plaques opposĆ©es, portĆ©es par la jambe correspondante et comportant chacune, sur chaque face latĆ©rale, une sĆ©rie de dents et, d'autre part, au moins deux ensembles opposĆ©s, portĆ©s par la coque et formĆ©s chacun par un pignon entraĆ®nĆ© en rotation et coopĆ©rant avec l'une des sĆ©ries de dents,
  • la navette est formĆ©e d'au moins trois Ć©lĆ©ments indĆ©pendants, associĆ©s chacun Ć  une jambe par des moyens de guidage et comportant des organes de stabilisation latĆ©rale du pont dans la position de support de ce pont,
  • chaque Ć©lĆ©ment de la navette comprend une branche verticale de positionnement sur la coque et comportant, Ć  sa partie supĆ©rieure, les moyens de guidage et les moyens de verrouillage et une branche horizontale de support du pont,
  • les moyens de guidage sont formĆ©s par deux rebords opposĆ©s dĆ©terminant chacun avec la branche verticale un logement pour une plaque de la jambe correspondante,
  • les moyens de verrouillage comprennent au moins une contre-crĆ©maillĆØre dĆ©plaƧable par au moins un organe d'actionnement entre une position escamotĆ©e et une position de blocage en prise sur l'une des sĆ©ries de dents de la jambe correspondante,
  • les organes de stabilisation comprennent, pour chaque Ć©lĆ©ment de la navette, au moins un vĆ©rin hydraulique ou pneumatique Ć  dĆ©placement horizontal,
  • la coque comporte des rails de glissement horizontal du pont entre la position de support sur les Ć©lĆ©ments de la navette et une position de stockage en dehors de la structure.
According to particular modes of implementation:
  • the mechanical means of displacement comprise, on the one hand, two opposite plates, carried by the corresponding leg and comprising each, on each lateral face, a series of teeth and, on the other hand, at least two opposite assemblies, carried by the shell and each formed by a pinion driven in rotation and cooperating with one of the series of teeth,
  • the shuttle is formed of at least three independent elements, each associated with a leg by guide means and having lateral stabilization members of the bridge in the support position of this bridge,
  • each element of the shuttle comprises a vertical positioning branch on the hull and comprising, at its upper part, the guide means and the locking means and a horizontal support leg of the bridge,
  • the guide means are formed by two opposite flanges each defining with the vertical leg a housing for a corresponding leg plate,
  • the locking means comprise at least one counter-rack which is displaceable by at least one actuating member between a retracted position and a blocking position engaged with one of the series of teeth of the corresponding leg,
  • the stabilizing members comprise, for each element of the shuttle, at least one hydraulic or pneumatic cylinder with horizontal displacement,
  • the hull comprises horizontal sliding rails of the bridge between the support position on the elements of the shuttle and a storage position outside the structure.

L'invention a Ć©galement pour objet un procĆ©dĆ© de dĆ©mantĆØlement et de transport d'un pont d'une plate-forme pĆ©troliĆØre fixe d'un site d'exploitation jusqu'Ć  un quai de dĆ©montage du pont, caractĆ©risĆ© en ce qu'il consiste en les Ć©tapes suivantes :

  • Ć  disposer au-dessous du pont une structure de transport comportant une coque flottante en forme de U Ć©quipĆ©e d'au moins trois jambes de levage de cette coque et d'une navette dĆ©plaƧable le long de ces jambes par ladite coque,
  • Ć  appliquer les jambes de levage sur le fond marin,
  • Ć  lever la coque et la navette pour amener ladite navette au contact du pont,
  • Ć  sĆ©parer le pont de sa colonne support,
  • Ć  soulever le pont par l'intermĆ©diaire de la coque et de la navette,
  • Ć  verrouiller la navette sur les jambes de levage de la structure et Ć  stabiliser latĆ©ralement le pont sur la navette,
  • Ć  abaisser la coque pour l'amener en flottaison,
  • Ć  poursuivre la descente de la coque pour provoquer par rĆ©action la remontĆ©e des jambes de levage de la structure,
  • Ć  dĆ©placer la structure supportant le pont pour dĆ©gager ledit pont de la colonne support,
  • Ć  appliquer les jambes de levage sur le fond marin et Ć  lever la coque pour l'amener au contact de la navette,
  • Ć  dĆ©verrouiller la navette des jambes de levage de la structure,
  • Ć  abaisser la coque supportant la navette et le pont pour l'amener en flottaison,
  • Ć  relever les jambes de levage de la structure,
  • Ć  amener par flottaison la structure supportant le pont jusqu'au quai de dĆ©montage,
  • Ć  appliquer les jambes de levage sur le fond pour stabiliser la coque,
  • Ć  libĆ©rer le pont de la structure,
  • Ć  assurer la liaison entre la surface de la coque et le quai, et
  • Ć  dĆ©charger sur le quai le pont de la plate-forme pĆ©troliĆØre.
The invention also relates to a method for dismantling and transporting a bridge of a fixed oil platform from an operating site to a platform for dismantling the bridge, characterized in that it consists of in the following steps:
  • providing below the deck a transport structure comprising a U-shaped floating hull equipped with at least three lifting legs of this hull and a shuttle movable along these legs by said hull,
  • to apply lifting legs on the seabed,
  • lifting the hull and the shuttle to bring said shuttle into contact with the bridge,
  • to separate the bridge from its support column,
  • to lift the bridge through the hull and the shuttle,
  • locking the shuttle on the lifting legs of the structure and laterally stabilizing the bridge on the shuttle,
  • to lower the hull to bring it in flotation,
  • to continue the descent of the hull to cause by reaction the lifting of the lifting legs of the structure,
  • moving the structure supporting the bridge to disengage said bridge from the support column,
  • applying the lifting legs to the seabed and lifting the hull to bring it into contact with the shuttle,
  • to unlock the shuttle from the lifting legs of the structure,
  • lowering the hull supporting the shuttle and the deck to bring it in flotation,
  • to raise the lifting legs of the structure,
  • flotation the structure supporting the deck to the dismantling wharf,
  • to apply the lifting legs on the bottom to stabilize the hull,
  • to release the bridge from the structure,
  • to ensure the connection between the surface of the hull and the wharf, and
  • to unload on the platform the deck of the oil platform.

L'invention a aussi pour objet un procĆ©dĆ© de transport et d'installation d'un pont d'une plate-forme pĆ©troliĆØre fixe d'un quai jusqu'Ć  un site d'exploitation, caractĆ©risĆ© en ce qu'il consiste en les Ć©tapes suivantes :

  • Ć  amener par flottaison Ć  proximitĆ© du quai une structure de transport comportant une coque flottante en forme de U Ć©quipĆ©e d'au moins trois jambes de levage de cette coque et d'une navette dĆ©plaƧable le long de ces jambes par ladite coque,
  • Ć  appliquer les jambes de levage sur le fond pour stabiliser la coque,
  • Ć  assurer la liaison entre la surface de la coque et le quai,
  • Ć  transfĆ©rer le pont du quai sur la navette de la structure et Ć  stabiliser latĆ©ralement le pont sur cette navette,
  • Ć  remonter les jambes de levage,
  • Ć  amener par flottaison la structure jusqu'Ć  proximitĆ© du site d'exploitation,
  • Ć  appliquer les jambes de levage sur le fond marin,
  • Ć  soulever le pont par l'intermĆ©diaire de la coque et de la navette,
  • Ć  verrouiller la navette sur les jambes de levage de la structure et Ć  descendre la coque pour l'amener en flottaison,
  • Ć  relever les jambes de levage de la structure,
  • Ć  amener le pont au-dessus d'une colonne support de la plate-forme pĆ©troliĆØre et Ć  appliquer les jambes de levage sur le fond marin,
  • Ć  lever la coque pour l'amener au contact de la navette et Ć  dĆ©verrouiller ladite navette,
  • Ć  descendre la coque, la navette et le pont pour poser ce pont sur la colonne support,
  • Ć  fixer le pont sur la colonne support,
  • Ć  descendre la coque et la navette pour amener ladite coque en flottaison,
  • Ć  relever les jambes de levage de la structure, et
  • Ć  retirer la structure du site d'exploitation.
The invention also relates to a method of transporting and installing a bridge of a fixed oil platform from a dock to an operating site, characterized in that it consists of the steps following:
  • bringing by floatation near the quay a transport structure comprising a U-shaped floating hull equipped with at least three lifting legs of this hull and a shuttle movable along these legs by said hull,
  • to apply the lifting legs on the bottom to stabilize the hull,
  • to ensure the connection between the surface of the hull and the quay,
  • transferring the platform bridge to the structure shuttle and laterally stabilizing the bridge on this shuttle,
  • to lift the lifting legs,
  • flotation the structure to near the operating site,
  • to apply lifting legs on the seabed,
  • to lift the bridge through the hull and the shuttle,
  • to lock the shuttle on the lifting legs of the structure and to lower the hull to bring it in flotation,
  • to raise the lifting legs of the structure,
  • to bring the bridge over a support column of the oil platform and to apply the lifting legs on the seabed,
  • lifting the hull to bring it into contact with the shuttle and to unlock said shuttle,
  • to lower the hull, the shuttle and the deck to put this bridge on the support column,
  • to fix the bridge on the support column,
  • to lower the hull and the shuttle to bring said hull in flotation,
  • lifting the lifting legs of the structure, and
  • to remove the structure of the site of exploitation.

L'invention sera mieux comprise Ơ la lecture de la description qui va suivre, donnƩe uniquement Ơ titre d'exemple et faite en se rƩfƩrant aux dessins annexƩs, sur lesquels :

  • la figure 1 est une vue schĆ©matique en Ć©lĆ©vation d'une plate-forme pĆ©troliĆØre fixe en position d'exploitation,
  • la figure 2 est une vue schĆ©matique en perspective d'une structure de transport, d'installation et de dĆ©mantĆØlement conforme Ć  l'invention,
  • la figure 3 est une vue partielle en coupe verticale des moyens mĆ©caniques de dĆ©placement de la structure,
  • la figure 4 est une vue en coupe selon la ligne 4-4 de la figure 3,
  • la figure 5 est une vue schĆ©matique en perspective d'un Ć©lĆ©ment de la navette de la structure conforme Ć  l'invention,
  • la figure 6 est une vue schĆ©matique en coupe verticale des moyens de verrouillage d'un Ć©lĆ©ment de la navette,
  • les figures 7A Ć  7J sont des schĆ©mas montrant les diffĆ©rentes Ć©tapes du procĆ©dĆ© conforme Ć  l'invention.
The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which:
  • FIG. 1 is a schematic view in elevation of a fixed oil platform in operating position,
  • FIG. 2 is a schematic perspective view of a transport, installation and dismantling structure according to the invention,
  • FIG. 3 is a partial view in vertical section of the mechanical means of displacement of the structure,
  • FIG. 4 is a sectional view along the line 4-4 of FIG. 3,
  • FIG. 5 is a schematic perspective view of a shuttle element of the structure according to the invention,
  • FIG. 6 is a diagrammatic view in vertical section of the locking means of an element of the shuttle,
  • Figures 7A to 7J are diagrams showing the various steps of the method according to the invention.

Sur la figure 1, on a reprĆ©sentĆ© schĆ©matiquement une plate-forme pĆ©troliĆØre fixe dĆ©signĆ©e dans son ensemble par la rĆ©fĆ©rence 1 et comprenant un pont 2 pourvu des Ć©quipements d'exploitation et des locaux d'habitation habituels. Ce pont 2 est montĆ© sur une colonne support 3 dont la base est ancrĆ©e sur le fond marin 4 par des organes d'ancrage 5.In Figure 1, there is shown schematically a fixed oil platform generally designated by reference 1 and comprising a bridge 2 provided with the usual operating equipment and living quarters. This bridge 2 is mounted on a support column 3 whose base is anchored on the seabed 4 by anchoring members 5.

Pour assurer le transport, l'installation (commissioning en anglais) et le dĆ©mantĆØlement (decommissioning en anglais) du pont 2 de la plate-forme pĆ©troliĆØre fixe 1 d'un site d'exploitation jusqu'Ć  un quai de dĆ©montage de ce pont 2 ou inversement, on utilise une structure dĆ©signĆ©e par la rĆ©fĆ©rence gĆ©nĆ©rale 10 et reprĆ©sentĆ©e Ć  la figure 2.To ensure transportation, installation (commissioning in English) and decommissioning (English decommissioning) of bridge 2 of the oil rig fixes 1 from an exploitation site to a dismantling pier of this bridge 2 or conversely, a structure designated by the general reference 10 and represented in FIG. 2 is used.

Sur cette figure, les dimensions gƩnƩrales de la structure ainsi que les proportions entre les diffƩrents ƩlƩments composant cette structure 10 n'ont pas ƩtƩ forcƩment respectƩes afin de simplifier la comprƩhension du dessin.In this figure, the overall dimensions of the structure and the proportions between the various elements making up this structure 10 have not necessarily been respected in order to simplify the understanding of the drawing.

D'une maniĆØre gĆ©nĆ©rale, la structure 10 comprend une coque flottante 11 en forme de U Ć©quipĆ©e de jambes de levage 12 de cette coque 11 et adaptĆ©e pour prendre appui sur le fond marin. La coque 11 comporte deux portions latĆ©rales 11 a et une portion de liaison 11b reliant les deux portions latĆ©rales 11a.In general, the structure 10 comprises a floating hull 11 in the shape of a U equipped with lifting legs 12 of this hull 11 and adapted to bear on the seabed. The shell 11 has two lateral portions 11a and a connecting portion 11b connecting the two side portions 11a.

Dans l'exemple de rƩalisation reprƩsentƩ Ơ la figure 2, la coque 11 est ƩquipƩe de quatre jambes de levage 12 disposƩes par paire sur chaque branche latƩrale 11a de ladite coque 11.In the embodiment shown in FIG. 2, the shell 11 is equipped with four lifting legs 12 arranged in pairs on each lateral branch 11a of said shell 11.

Selon une variante, la coque 11 peut ĆŖtre Ć©quipĆ©e de trois jambes de levage 12 rĆ©parties selon un triangle, une jambe 12 Ć©tant placĆ©e sur chaque portion latĆ©rale 11 a et une jambe 12 Ć©tant placĆ©e sur la portion de liaison 11 b.Alternatively, the shell 11 may be equipped with three lifting legs 12 distributed in a triangle, a leg 12 being placed on each side portion 11a and a leg 12 being placed on the connecting portion 11b.

Chaque jambe 12 se termine Ơ son extrƩmitƩ infƩrieure par un sabot 13 destinƩ Ơ prendre appui sur le fond marin 4.Each leg 12 ends at its lower end by a shoe 13 intended to bear on the seabed 4.

Ainsi que reprƩsentƩ Ơ la figure 2, chacune de ces jambes 12 prƩsente, dans ce mode de rƩalisation, une section triangulaire. Ces jambes 12 peuvent Ʃgalement prƩsenter une section carrƩe ou circulaire.As shown in Figure 2, each of these legs 12 has, in this embodiment, a triangular section. These legs 12 may also have a square or circular section.

Chaque jambe 12 est formƩe de trois membrures 14 reliƩes entre elles par un treillis de poutrelles mƩtalliques 15.Each leg 12 is formed of three ribs 14 interconnected by a lattice of metal beams 15.

Chaque jambe 12 est associƩe Ơ des moyens mƩcaniques de dƩplacement dƩsignƩs par la rƩfƩrence gƩnƩrale 20 (figures 3 et 4).Each leg 12 is associated with mechanical means of displacement designated by the general reference 20 (Figures 3 and 4).

Pour chaque jambe 12, les moyens mƩcaniques de dƩplacement 20 sont logƩs dans une ossature porteuse 16, Ʃgalement appelƩe par les spƩcialistes "jack-house", qui est supportƩe par la coque 11.For each leg 12, the mechanical displacement means 20 are housed in a supporting frame 16, also called by the "jack-house" specialists, which is supported by the shell 11.

Ainsi que reprĆ©sentĆ© sur les figures 3 et 4, les moyens mĆ©caniques de dĆ©placement 20 de chaque jambe 12 comprennent, d'une part, deux plaques opposĆ©es 21 portĆ©es chacune par une membrure 14 de la jambe 12 correspondante et comportant chacune, sur chaque face latĆ©rale, une sĆ©rie de dents 22 formant sur les deux membrures 14 une crĆ©maillĆØre double. Les moyens mĆ©caniques de dĆ©placement 20 comprennent Ć©galement plusieurs ensembles 25 rĆ©partis de part et d'autre de chaque plaque 21, suivant la hauteur de celle-ci. Chaque ensemble 25 comprend un groupe moto-rĆ©ducteur 26 assurant l'entraĆ®nement d'un pignon 27 qui engrĆØne avec une sĆ©rie de dents 22 de la plaque 21 correspondante. Dans le mode de rĆ©alisation reprĆ©sentĆ© sur les figures 3 et 4, les deux sĆ©ries de dents 22 de chaque plaque 21 sont associĆ©es avec huit pignons 27 entraĆ®nĆ©s chacun en rotation par un groupe moto-rĆ©ducteur 26.As shown in FIGS. 3 and 4, the mechanical displacement means 20 of each leg 12 comprise, on the one hand, two opposite plates 21 each carried by a rib 14 of the corresponding leg 12 and each comprising, on each lateral face , a series of teeth 22 forming on the two ribs 14 a double rack. The mechanical displacement means 20 also comprise several sets 25 distributed on either side of each plate 21, according to the height thereof. Each set 25 comprises a geared motor unit 26 for driving a pinion 27 which meshes with a series of teeth 22 of the corresponding plate 21. In the embodiment shown in Figures 3 and 4, the two sets of teeth 22 of each plate 21 are associated with eight pinions 27 each rotated by a geared motor unit 26.

La structure 10 comporte Ć©galement une navette dĆ©signĆ©e par la rĆ©fĆ©rence gĆ©nĆ©rale 30 qui est dĆ©plaƧable le long des jambes 12 par la coque 11 et qui est destinĆ©e Ć  ĆŖtre appliquĆ©e sur la face infĆ©rieure du pont 2 de la plate-forme pĆ©troliĆØre 1, comme on le verra ultĆ©rieurement.The structure 10 also comprises a shuttle designated by the general reference 30 which is movable along the legs 12 by the shell 11 and which is intended to be applied on the underside of the deck 2 of the oil platform 1, as it is will see later.

Comme reprƩsentƩ Ơ la figure 2, la navette 30 est composƩe d'ƩlƩments indƩpendants 31 dont le nombre correspond au nombre de jambes 12 de la structure 10. Ainsi, dans l'exemple de rƩalisation reprƩsentƩ sur les figures, la navette 30 se compose de quatre ƩlƩments indƩpendants 31, associƩs chacun Ơ une jambe de levage 12.As represented in FIG. 2, the shuttle 30 is composed of independent elements 31 the number of which corresponds to the number of legs 12 of the structure 10. Thus, in the embodiment shown in the figures, the shuttle 30 consists of four independent elements 31, each associated with a lifting leg 12.

Selon une variante, la navette 30 peut aussi ĆŖtre constituĆ©e par un Ć©lĆ©ment en forme de cadre supportĆ© par les jambes de levage 12 Ć  l'aide des moyens mĆ©caniques de dĆ©placement 20.According to one variant, the shuttle 30 may also consist of a frame-shaped element supported by the lifting legs 12 by means of the mechanical displacement means 20.

En se reportant aux figures 3 Ơ 6, on va dƩcrire un ƩlƩment indƩpendant 31 de la navette 30, les autres ƩlƩments indƩpendants 31 Ʃtant identiques.Referring to FIGS. 3 to 6, an independent element 31 of the shuttle 30 will be described, the other independent elements 31 being identical.

L'ƩlƩment 31 comprend une branche verticale 32 de positionnement sur une face latƩrale de l'ossature porteuse 16 de la coque 11 et une branche horizontale 33 de support du pont 2 au cours de son transport. La branche verticale 32 comporte des moyens de guidage sur la jambe 12 correspondante et des moyens de verrouillage sur cette jambe 12.The element 31 comprises a vertical leg 32 for positioning on a lateral face of the supporting framework 16 of the shell 11 and a horizontal support leg 33 of the bridge 2 during its transport. The vertical branch 32 comprises guide means on the corresponding leg 12 and locking means on this leg 12.

Les moyens de guidage sont formĆ©s par deux rebords opposĆ©s 34 mĆ©nagĆ©s Ć  la partie supĆ©rieure de la branche verticale 32 et s'Ć©tendant parallĆØlement Ć  la branche horizontale 33 de l'Ć©lĆ©ment 31. Chaque rebord 34 dĆ©termine avec ladite branche verticale 32 un logement 35 pour une plaque 21 de la jambe 12 correspondante. Ainsi, chaque Ć©lĆ©ment 31 est guidĆ© sur la jambe 12 correspondante par les plaques 21.The guide means are formed by two opposite flanges 34 formed at the upper part of the vertical branch 32 and extending parallel to the horizontal branch 33 of the element 31. Each flange 34 determines with said vertical branch 32 a housing 35 for a plate 21 of the corresponding leg 12. Thus, each element 31 is guided on the corresponding leg 12 by the plates 21.

Les moyens de verrouillage de chaque Ć©lĆ©ment 31 sont formĆ©s, comme reprĆ©sentĆ© Ć  la figure 6, par au moins une contre-crĆ©maillĆØre 36 et, de prĆ©fĆ©rence, par au moins une contre-crĆ©maillĆØre 36 pour chaque plaque 21. La contre-crĆ©maillĆØre 36 est dĆ©plaƧable par au moins un organe d'actionnement 37 et, de prĆ©fĆ©rence, par deux organes d'actionnement 37 constituĆ©s par exemple par des vĆ©rins hydrauliques ou pneumatiques afin de dĆ©placer la contre-crĆ©maillĆØre 36 entre une position escamotĆ©e et une position de blocage en prise sur l'une des sĆ©ries de dents 22 de la jambe 12 correspondante. L'ensemble constituĆ© par la contre-crĆ©maillĆØre 36 et les organes d'actionnement 37 est portĆ© par l'Ć©lĆ©ment 31 au moyen d'organes de fixation appropriĆ©s, non reprĆ©sentĆ©s.The locking means of each element 31 are formed, as represented in FIG. 6, by at least one counter-rack 36 and, preferably, by at least one counter-rack 36 for each plate 21. The counter-rack 36 is displaceable by at least one actuating member 37 and, preferably, by two actuating members 37 constituted for example by hydraulic or pneumatic cylinders in order to move the counter-rack 36 between a retracted position and a locking position in engagement on one of the series of teeth 22 of the corresponding leg 12. The assembly constituted by the counter-rack 36 and the actuating members 37 is carried by the element 31 by means of suitable fasteners, not shown.

De plus, chaque ƩlƩment 31 de la navette 30 est pourvu d'organes de stabilisation latƩrale du pont 2 dans la position de support de ce pont 2 et qui sont formƩs par au moins un vƩrin hydraulique ou pneumatique 38 Ơ dƩplacement horizontal disposƩ par exemple dans la branche verticale 32 dudit ƩlƩment 31.In addition, each element 31 of the shuttle 30 is provided with lateral stabilization members of the bridge 2 in the support position of this bridge 2 and which are formed by at least one hydraulic or pneumatic cylinder 38 with horizontal displacement arranged for example in the vertical branch 32 of said element 31.

Comme reprĆ©sentĆ© notamment sur les figures 4 et 5, chaque Ć©lĆ©ment 31 est pourvu de deux glissiĆØres 39 s'Ć©tendant chacune verticalement le long d'un bord latĆ©ral de la branche verticale 32. Chaque glissiĆØre 39 coopĆØre avec une glissiĆØre 40 verticale fixĆ©e sur l'ossature 16 au niveau de chaque jambe de levage 12. Les glissiĆØres 39 et 40 sont pourvues sur leurs faces en regard d'une garniture glissante formĆ©e par exemple par une garniture en "tĆ©flon".As shown in particular in FIGS. 4 and 5, each element 31 is provided with two slides 39 each extending vertically along a lateral edge of the vertical branch 32. Each slide 39 cooperates with a vertical slide 40 fixed on the frame 16 at each lifting leg 12. The slides 39 and 40 are provided on their faces facing a sliding lining formed for example by a "Teflon" gasket.

Enfin, la branche horizontale 33 de chaque Ć©lĆ©ment 31 comporte, sur sa face supĆ©rieure, des organes Ć©lastiques 41 d'appui du pont 2 de la plate-forme pĆ©troliĆØre 1. Ces organes Ć©lastiques 41 sont constituĆ©s par exemple par des blocs en Ć©lastomĆØre ou par exemple par des coussins gonflables ou encore par tout autre systĆØme appropriĆ©.Finally, the horizontal branch 33 of each element 31 comprises, on its upper face, resilient members 41 for supporting the bridge 2 of the oil platform 1. These elastic members 41 are constituted for example by elastomer blocks or by example by airbags or by any other appropriate system.

Comme reprĆ©sentĆ© sur la figure 2, la coque 11 est munie sur sa face supĆ©rieure, de rails 42 s'Ć©tendant dans la mĆŖme direction que les portions latĆ©rales 11 a de ladite coque 11 et qui permettent le glissement horizontal du pont 2 lorsque ce dernier a Ć©tĆ© prĆ©alablement placĆ© sur ladite coque 11 entre la position de support sur les Ć©lĆ©ments 31 de la navette 30 et une position de stockage en dehors de la structure 11, comme par exemple sur le quai d'un port pour permettre le dĆ©montage du pont 2 en toute sĆ©curitĆ© pour le personnel ou inversement c'est Ć  dire le transfert du pont 2 du quai sur les Ć©lĆ©ments 31 de la navette 30 pour le transport de ce pont 2 jusqu'au site d'exploitation.As shown in FIG. 2, the shell 11 is provided on its upper face with rails 42 extending in the same direction as the lateral portions 11a of said shell 11 and which allow the horizontal sliding of the bridge 2 when the latter has previously placed on said shell 11 between the support position on the elements 31 of the shuttle 30 and a storage position outside the structure 11, as for example on the dock of a port to allow disassembly of the bridge 2 in all safety for the personnel or vice versa ie the transfer of the bridge 2 of the wharf on the elements 31 of the shuttle 30 for the transport of this bridge 2 to the operating site.

Enfin, la coque 11 comporte, au niveau de sa partie ouverte, une porte 43 formƩe par exemple de deux battants 44 dƩplaƧables entre une position ouverte pour le positionnement de la structure 10 au-dessous du pont 2 et une position fermƩe au cours du transfert dudit pont 2 par la structure 10.Finally, the shell 11 comprises, at its open portion, a door 43 formed for example of two leaves 44 movable between an open position for the positioning of the structure 10 below the bridge 2 and a closed position during the transfer said bridge 2 by the structure 10.

Le transport du pont 2 par la structure 10 entre le site d'exploitation et un quai d'un port est rƩalisƩ de la faƧon suivante.The transport of the bridge 2 by the structure 10 between the operating site and a dock of a port is carried out as follows.

Tout d'abord, et comme reprƩsentƩ Ơ la figure 7A, la structure 10, avec les battants 44 en position ouverte, est amenƩe par flottaison au-dessous du pont 2 de la plate-forme 1 en positionnant la colonne support 3 du pont 2 dans l'espace en forme de U mƩnagƩ entre les portions latƩrales 11 a de la coque 11. Au cours de ce positionnement, les jambes de levage 12 sont en position escamotƩe de telle sorte que les sabots 13 soient disposƩs au-dessous de la coque 11. Les ƩlƩments 31 de la navette 30 sont appliquƩs contre la coque 11, comme reprƩsentƩ notamment Ơ la figure 2.First, and as shown in FIG. 7A, the structure 10, with the leaves 44 in the open position, is floated below the deck 2 of the platform 1 by positioning the support column 3 of the deck 2 in the U-shaped space formed between the lateral portions 11a of the shell 11. During this positioning, the lifting legs 12 are in the retracted position so that the shoes 13 are arranged below the hull 11. The elements 31 of the shuttle 30 are applied against the shell 11, as shown in particular in FIG. 2.

Ensuite, les groupes moto-rĆ©ducteurs 26 sont actionnĆ©s pour entraĆ®ner en rotation les pignons 27 qui engrĆØnent avec les sĆ©ries de dents 22 des plaques 21 de chaque jambe de levage 12 afin d'amener les sabots 13 en contact avec le fond marin 4.Then, the geared motor units 26 are actuated to drive in rotation the pinions 27 which mesh with the series of teeth 22 of the plates 21 of each lifting leg 12 in order to bring the shoes 13 in contact with the seabed 4.

DĆØs que les sabots 13 sont en contact du fond marin 4, la coque 11 se dĆ©place vers le haut, le long des jambes 12, sous l'effet de l'entraĆ®nement en rotation des pignons 27 qui engrĆØnent avec les sĆ©ries de dents 22 des plaques 21 des jambes de levage 12. En se dĆ©plaƧant vers le haut, la coque 11 soulĆØve la navette 30 pour appliquer les organes Ć©lastiques 41 de chaque Ć©lĆ©ment 31 contre la face infĆ©rieure du pont 2. L'entraĆ®nement des pignons 27 est arrĆŖtĆ© et les contre-crĆ©maillĆØres 36 sont actionnĆ©es par les vĆ©rins 37 pour que ces contre-crĆ©maillĆØres 36 viennent en prise avec les dents 22 adjacentes afin de verrouiller chaque Ć©lĆ©ment 31 de la navette 30 sur les jambes de levage 12, ainsi que reprĆ©sentĆ© Ć  la figure 7C.As soon as the shoes 13 are in contact with the seabed 4, the shell 11 moves upwards, along the legs 12, under the effect of the rotation drive of the pinions 27 which mesh with the series of teeth 22 of the 21 of the lifting legs 12. By moving upwards, the hull 11 raises the shuttle 30 to apply the elastic members 41 of each element 31 against the underside of the bridge 2. The driving of the gears 27 is stopped and the Counter-racks 36 are actuated by the cylinders 37 so that these counter-racks 36 engage with the adjacent teeth 22 to lock each element 31 of the shuttle 30 on the lifting legs 12, as shown in Figure 7C.

Ensuite, la colonne support 3 est sƩparƩe du pont 2 par exemple en coupant les tiges de cette colonne support et l'ensemble constituƩ par la coque 11, la navette 30 et le pont 2 est soulevƩ afin d'Ʃcarter le pont 2 de la colonne support 3 qui demeure en position verticale, comme reprƩsentƩe sur la figure 7C.Then, the support column 3 is separated from the bridge 2 for example by cutting the rods of this support column and the assembly constituted by the shell 11, the shuttle 30 and the bridge 2 is raised to separate the bridge 2 of the column support 3 which remains in a vertical position, as shown in FIG. 7C.

AprĆØs ces diffĆ©rentes opĆ©rations, la coque 11 est descendue en flottaison par l'entraĆ®nement en sens inverse des pignons 27 qui engrĆØnent avec les sĆ©ries de dents 22 (figure 7D) et les pignons 27 sont toujours entraĆ®nĆ©s en rotation, ce qui provoque, par rĆ©action, du fait de l'enfoncement de la coque 11 dans l'eau, la remontĆ©e des jambes de levage 12 (figure 7E), ce qui permet de dĆ©gager la coque 11 supportant le pont 2 par l'intermĆ©diaire de la navette 30 du site d'exploitation sur lequel la colonne support 3 est toujours en place, comme montrĆ© Ć  la figure 7F.After these various operations, the hull 11 is floated by the drive in the opposite direction of the pinions 27 which mesh with the series of teeth 22 (Figure 7D) and the pinions 27 are always rotated, which causes, by reaction due to the depression of the hull 11 in the water, the lifting of the lifting legs 12 (FIG. 7E), which makes it possible to releasing the shell 11 supporting the bridge 2 via the shuttle 30 of the operating site on which the support column 3 is still in place, as shown in Figure 7F.

Ensuite, les jambes de levage 12 sont de nouveau abaissĆ©es pour amener les sabots 13 en appui sur le fond marin 4 et la coque 11 est soulevĆ©e par l'entraĆ®nement en rotation des pignons 27 pour amener cette coque 11 contre les Ć©lĆ©ments 31 de -la navette 30 (figure 7G). Ces Ć©lĆ©ments 31 de la navette 30 sont dĆ©verrouillĆ©s en ramenant en position escamotĆ©e les contre-crĆ©maillĆØres 36 par l'intermĆ©diaire des vĆ©rins 37 et l'ensemble comprenant la coque 11, la navette 30 et le pont 2 est abaissĆ© afin d'amener la coque 11 en flottaison, comme illustrĆ© Ć  la figure 7H.Then, the lifting legs 12 are lowered again to bring the shoes 13 resting on the seabed 4 and the shell 11 is lifted by the rotation drive of the pinions 27 to bring the shell 11 against the elements 31 of the shuttle 30 (FIG. 7G). These elements 31 of the shuttle 30 are unlocked by retracting the counter-racks 36 into the retracted position via the jacks 37 and the assembly comprising the hull 11, the shuttle 30 and the deck 2 is lowered in order to bring the hull 11 in waterline, as shown in Figure 7H.

Au cours des dĆ©placements des Ć©lĆ©ments 31 de la navette 30 par rapport Ć  la coque 11, ces Ć©lĆ©ments 31 sont guidĆ©s par les rebords 34 de la branche verticale 32 et par les glissiĆØres 39 et 40.During the movements of the elements 31 of the shuttle 30 relative to the shell 11, these elements 31 are guided by the flanges 34 of the vertical leg 32 and by the slides 39 and 40.

Au cours du transport, la stabilisation latƩrale du pont 2 est assurƩe par les vƩrins 38 de chaque ƩlƩment 31 de la navette 30 qui sont en contact avec les faces latƩrales du pont 2.During transport, the lateral stabilization of the bridge 2 is ensured by the jacks 38 of each element 31 of the shuttle 30 which are in contact with the lateral faces of the bridge 2.

La coque 11 supportant le pont 2 est amenĆ©e par flottaison (figure 71) jusqu'Ć  un quai d'un port (figure 7J) et les jambes de levage 12 sont appliquĆ©es sur le fond pour stabiliser cette coque 11. Les vĆ©rins 38 sont rĆ©tractĆ©s et une piĆØce de liaison 6 est placĆ©e entre la coque 11 et le quai pour assurer une continuitĆ© entre la surface de cette coque 11 et ledit quai. Ensuite, le pont 2 est dĆ©chargĆ© sur ce quai en le faisant par exemple glisser sur les rails 42.The hull 11 supporting the deck 2 is floated (Figure 71) to a dock of a port (Figure 7J) and the lifting legs 12 are applied on the bottom to stabilize the hull 11. The cylinders 38 are retracted and a connecting piece 6 is placed between the shell 11 and the dock to ensure continuity between the surface of the shell 11 and said dock. Then, the bridge 2 is unloaded on this platform by for example sliding on the rails 42.

Le transport du pont 2 par la structure 10 entre le quai du port et le site d'exploitation est rĆ©alisĆ© en effectuant les opĆ©rations inverses qui sont mentionnĆ©es briĆØvement ci-dessous.The transport of the bridge 2 by the structure 10 between the port dock and the operating site is achieved by performing the reverse operations which are briefly mentioned below.

Tout d'abord, la structure de transport 10 est amenĆ©e par flottaison Ć  proximitĆ© du quai et les jambes de levage 12 sont appliquĆ©es sur le fond pour stabiliser la coque 11. La liaison entre la surface de la coque 11 et le quai est assurĆ©e par la piĆØce 6 et le pont 2 est transfĆ©rĆ© du quai sur les Ć©lĆ©ments 31 de la navette 30 en le faisant glisser sur les rails 42.First, the transport structure 10 is floated near the dock and the lifting legs 12 are applied to the bottom to stabilize the hull 11. The connection between the surface of the hull 11 and the dock is provided by the part 6 and the bridge 2 is transferred from the platform to the elements 31 of the shuttle 30 by sliding it on the rails 42.

Ensuite, le pont 2 est stabilisĆ© latĆ©ralement sur les Ć©lĆ©ments 31 de la navette 6 au moyen des vĆ©rins 38 de chaque Ć©lĆ©ment 31, puis la piĆØce de liaison 35 est enlevĆ©e et les jambes de levage 12 sont remontĆ©es.Then, the bridge 2 is stabilized laterally on the elements 31 of the shuttle 6 by means of the cylinders 38 of each element 31, then the connecting piece 35 is removed and the lifting legs 12 are raised.

La structure 10 supportant le pont 2 est amenƩe par flottaison jusqu'Ơ proximitƩ du site d'exploitation et les jambes de levage 12 sont appliquƩes sur le fond marin de faƧon Ơ soulever le pont 2 par l'intermƩdiaire de la coque 11 et de la navette 30.The structure 10 supporting the deck 2 is flown to the vicinity of the operating site and the lifting legs 12 are applied to the seabed so as to lift the deck 2 by means of the hull 11 and the shuttle 30.

Les Ć©lĆ©ments 31 de la navette 30 sont verrouillĆ©s sur les jambes de levage 12 par l'intermĆ©diaire des contre-crĆ©maillĆØres 36 qui sont actionnĆ©es par les vĆ©rins 37 afin que ces contre-crĆ©maillĆØres 36 viennent en prise avec les dents 22 adjacentes et de ce fait verrouiller chaque Ć©lĆ©ment 31 de la navette 30 sur les jambes de levage 12.The elements 31 of the shuttle 30 are locked on the lifting legs 12 by means of the counter-racks 36 which are actuated by the jacks 37 so that these counter-racks 36 engage with the adjacent teeth 22 and thereby locking each element 31 of the shuttle 30 on the lifting legs 12.

La coque 11 est amenĆ©e en flottaison et les jambes 12 de la structure 11 sont relevĆ©es. Le pont 2 est amenĆ© au-dessus de la colonne support 3 de la plate-forme pĆ©troliĆØre 1 et les jambes de levage 12 de la structure 10 sont de nouveau appliquĆ©es sur le fond marin. La coque 11 est levĆ©e pour l'amener au contact des Ć©lĆ©ments 31 de la navette 30 et ces Ć©lĆ©ments 31 sont dĆ©verrouillĆ©s, puis la coque 11, la navette 30 et le pont 2 sont descendus afin de poser ce pont 2 sur la colonne support 3.The hull 11 is floated and the legs 12 of the structure 11 are raised. The bridge 2 is brought above the support column 3 of the oil platform 1 and the lifting legs 12 of the structure 10 are again applied to the seabed. The shell 11 is raised to bring it into contact with the elements 31 of the shuttle 30 and these elements 31 are unlocked, then the shell 11, the shuttle 30 and the bridge 2 are lowered in order to put the bridge 2 on the support column 3 .

Le pont 2 est fixƩ sur la colonne support 3 et la coque 11 et la navette 30 sont descendues pour amener ladite coque 11 en flottaison, puis les jambes de levage 12 relevƩes.The bridge 2 is fixed on the support column 3 and the hull 11 and the shuttle 30 are lowered to bring said hull 11 floating, then the lifting legs 12 raised.

La structure 10 est ensuite retirƩe du site d'exploitation.The structure 10 is then removed from the operating site.

La structure selon l'invention prĆ©sente l'avantage de pouvoir transporter l'ensemble du pont de la plate-forme pĆ©troliĆØre directement du site d'exploitation sur un site fixe oĆ¹ son dĆ©montage peut ĆŖtre effectuĆ© en toute sĆ©curitĆ©, sans risque de pollution du milieu marin ou inversement entre un site fixe et un site d'exploitation oĆ¹ le pont est fixĆ© sur sa colonne support.The structure according to the invention has the advantage of being able to transport the entire deck of the oil platform directly from the operating site to a fixed site where its dismantling can be carried out safely, without risk of pollution of the environment. marine or conversely between a fixed site and an exploitation site where the bridge is fixed on its support column.

De plus, les diffĆ©rentes Ć©tapes de transfert et de transport sont rĆ©alisĆ©es sans aucune opĆ©ration de ballastage, permettant ainsi de rĆ©aliser un gain de temps important, ce qui est apprĆ©ciable dans des rĆ©gions oĆ¹ les conditions atmosphĆ©riques sont trĆØs rapidement changeantes.In addition, the different stages of transfer and transport are carried out without any ballasting operation, thus making it possible to save a considerable amount of time, which is appreciable in regions where the atmospheric conditions are very rapidly changing.

Enfin, les opƩrations de transfert du pont entre la structure de transport et le quai ou inversement sont facilitƩes du fait que la coque de la structure de transport se trouve au niveau de ce quai.Finally, the transfer operations of the bridge between the transport structure and the wharf or vice versa are facilitated by the fact that the hull of the transport structure is at this wharf.

Claims (13)

  1. A structure for transporting, installing and dismantling a deck (2) of a fixed oil platform (1) for offshore exploitation, characterised in that it comprises:
    - a U-shaped floating hull (11) equipped with at least three raising legs (12) for this hull (11) which are adapted in order to rest on the sea bed, each raising leg (12) being associated with mechanical displacement means (20), and
    - a travelling block (30) which can be displaced along the raising legs (12) by the hull (11) and which is intended to be applied to the lower face of the deck (2) in a position whereby said deck is supported, said travelling block (30) being provided with means (36, 37) for locking onto the raising legs (12).
  2. The structure according to Claim 1, characterised in that the mechanical displacement means (20) include, on the one hand, two opposing plates (21) which are borne by the corresponding raising leg. (12) and which each comprise, on each lateral face, a series of teeth (22) and, on the other hand, at least two opposing assemblies (25) which are borne by the hull (11) and which are each formed by a pinion (27) which is rotationally driven and which co-operates with one of the series of teeth (22).
  3. The structure according to Claim 1 or 2, characterised in that the travelling block (30) is formed by at least three independent elements (31) which are each associated with a raising leg (12) via guiding means (34), and comprising members (38) for laterally stabilising the deck (2) in the position whereby this deck is supported.
  4. The structure according to any one of the preceding claims, characterised in that each element (31) of the travelling block (30) includes a vertical branch (32) for carrying out positioning on the hull (11), and comprising the guiding means (34) and the locking means (36, 37) and a horizontal branch (33) for supporting the deck (2).
  5. The structure according to any one of the preceding claims, characterised in that the guiding means are formed by two opposing edges (24), each determining, with the vertical branch (32), a housing (35) for a plate (21) of the corresponding raising leg (12).
  6. The structure according to any one of the preceding claims, characterised in that the locking means include at least one counter-rack (36) which can be displaced by at least one actuating member (37) between a retracted position and an engaged blocking position on one of the series of teeth (22) of the corresponding raising leg (12).
  7. The structure according to any of the preceding claims, characterised in that the stabilising members include, for each element (31) of the travelling block (30), at least one horizontally displaceable hydraulic or pneumatic jack (38).
  8. The structure according to any one of the preceding claims, characterised in that each element (21) of the travelling block (30) comprises at least one slide (39) which is mounted on the vertical branch (32) and is intended to co-operate with a slide (40) which is mounted on the hull (11).
  9. The structure according to any one of the preceding claims, characterised in that the horizontal branch (33) of each element (31) of the travelling block (30) comprises, on its upper face, elastic members (41) for the deck (2) to rest upon.
  10. The structure according to any one of the preceding claims, characterised in that the hull (11) comprises rails (42) for horizontal sliding of the deck (2) between the support position on the elements (31) of the travelling block (30) and a storage position outside said elements (31) of the travelling block.
  11. The structure according to any one of the preceding claims, characterised in that the hull (11) comprises, at its open part, a door (43, 44) which can be displaced between an open position for the positioning of the structure below the deck (2) and a closed position during the transporting of said deck (2).
  12. A method for dismantling and transporting a deck (2) of a fixed oil platform (1) from an exploitation site to a disassembly quay for the deck (2), characterised in that it consists of the following steps:
    - arranging, below the deck (2), a transporting structure (10) comprising a U-shaped floating hull (11) equipped with at least three raising legs (12) for this hull (11) and a travelling block (30) which can be displaced along these raising legs (12) by said hull (11),
    - applying the raising legs (12) to the sea bed,
    - lifting the hull (11) and the travelling block (30) in order to bring said travelling block (30) into contact with the deck (2),
    - separating the deck (2) from its support column (3),
    - elevating the deck (2) by means of the hull (11) and the travelling block (30),
    - locking the travelling block (30) onto the raising legs (12) of the structure (10) and laterally stabilising the deck (2) on the travelling block (30),
    - lowering the hull (11) to bring it into a floating state,
    - proceeding with the lowering of the hull (11) in order to bring about, in response, the lifting of the raising legs (12) of the structure (10),
    - displacing the structure (10) supporting the deck (2) in order to disengage said deck (2) from the support column (3),
    - applying the raising legs (12) to the sea bed and raising the hull (11) in order to bring it into contact with the travelling block (30),
    - unlocking the travelling block (30) from the raising legs (12) of the structure (10),
    - lowering the hull (11) supporting the travelling block (30) and the deck (2) in order to bring it into a floating state,
    - raising the raising legs (12) of the structure (10),
    - bringing the structure (10) supporting the deck (2) to the disassembly quay by floatation,
    - applying the raising legs (12) to the sea bed in order to stabilise the hull (11),
    - freeing the deck (2) from the structure (10),
    - ensuring connection between the surface of the hull (11) and the quay, and
    - discharging the deck (2) onto the quay.
  13. A method for installing and transporting a deck (2) of a fixed oil platform from a quay to an exploitation site, characterised in that it consists of the following steps:
    - bringing into the proximity of the quay by floatation a transporting structure (10) comprising a U-shaped floating hull (11) equipped with at least three raising legs (12) for this hull (11) and with a travelling block (30) which can be displaced along these raising legs (12) by said hull (11),
    - applying the raising legs (12) to the sea bed in order to stabilise the hull (11),
    - ensuring connection between the surface of the hull (11) and the quay,
    - transferring the deck (2) from the quay onto the travelling block (30) of the structure (10) and laterally stabilising the deck (2) on this travelling block (30),
    - lifting the raising legs (12),
    - bringing the structure into the proximity of the exploitation site by floatation,
    - applying the raising legs (12) to the sea bed,
    - elevating the deck (2) by means of the hull (11) and the travelling block (30),
    - locking the travelling block (30) onto the raising legs (12) of the structure (10) and lowering the hull (11) in order to bring it into a floating state,
    - raising the raising legs (12) of the structure (10),
    - bringing the deck (2) above a support column (3) of the oil platform (1) and applying the raising legs (12) to the sea bed,
    - raising the hull (11) in order to bring it into contact with the travelling block (30) and unlocking said travelling block (30),
    - lowering the hull (11), the travelling block (30) and the deck (2) in order to place this deck (2) on the support column (3),
    - fixing the deck (2) onto the support column (3),
    - lowering the hull (11) and the travelling block (30) in order to bring said hull (11) into a floating state,
    - raising said raising legs (12) of the structure (10), and
    - removing the structure (10) from the exploitation site.
EP03722695A 2002-03-22 2003-03-06 Structure for the transport, installation and dismantlement of a bridge of a fixed oil platform and method for implementing said structure Expired - Lifetime EP1487693B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0203637 2002-03-22
FR0203637A FR2837461B1 (en) 2002-03-22 2002-03-22 TRANSPORT, INSTALLATION AND DISMANTLING STRUCTURE OF A BRIDGE OF A FIXED OIL PLATFORM AND METHOD FOR IMPLEMENTING SUCH A STRUCTURE
PCT/FR2003/000723 WO2003080425A1 (en) 2002-03-22 2003-03-06 Structure for the transport, installation and dismantlement of a bridge of a fixed oil platform and method for implementing said structure

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EP1487693A1 EP1487693A1 (en) 2004-12-22
EP1487693B1 true EP1487693B1 (en) 2007-05-09

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US (1) US7513713B2 (en)
EP (1) EP1487693B1 (en)
AT (1) ATE361871T1 (en)
AU (1) AU2003229859A1 (en)
DE (1) DE60313755D1 (en)
DK (1) DK1487693T3 (en)
FR (1) FR2837461B1 (en)
NO (1) NO330967B1 (en)
WO (1) WO2003080425A1 (en)

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ATE361871T1 (en) 2007-06-15
NO20043773L (en) 2004-11-17
EP1487693A1 (en) 2004-12-22
WO2003080425A1 (en) 2003-10-02
FR2837461A1 (en) 2003-09-26
US20050158125A1 (en) 2005-07-21
AU2003229859A1 (en) 2003-10-08
DK1487693T3 (en) 2007-09-17
FR2837461B1 (en) 2004-06-18
NO330967B1 (en) 2011-08-29
US7513713B2 (en) 2009-04-07
DE60313755D1 (en) 2007-06-21

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