EP0921061A1 - Dockvorrichtung für eine schwimmende Struktur - Google Patents

Dockvorrichtung für eine schwimmende Struktur Download PDF

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Publication number
EP0921061A1
EP0921061A1 EP98402861A EP98402861A EP0921061A1 EP 0921061 A1 EP0921061 A1 EP 0921061A1 EP 98402861 A EP98402861 A EP 98402861A EP 98402861 A EP98402861 A EP 98402861A EP 0921061 A1 EP0921061 A1 EP 0921061A1
Authority
EP
European Patent Office
Prior art keywords
turret
key
mooring
well
notch
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.)
Withdrawn
Application number
EP98402861A
Other languages
English (en)
French (fr)
Inventor
Bernard Thomas
Alain Frizot
Rémy Plantadis
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.)
NFM Technologies SAS
Original Assignee
NFM Technologies SAS
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 NFM Technologies SAS filed Critical NFM Technologies SAS
Publication of EP0921061A1 publication Critical patent/EP0921061A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/507—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets

Definitions

  • the invention relates to a mooring device for a structure floating and in particular for a boat used for drilling at sea or for the exploitation of oil or gas wells underwater.
  • boat mooring systems used for operation offshore oil whose hull is crossed by a shaft well vertical opening into the open air at its top, at a bridge upper part of the boat and, at its lower part, in the body of water on which floats the boat, at the bottom of the hull, below the waterline.
  • the vertical well can be used in particular to make pass the drill string or the well operating conduits to across the hull of the boat, towards the bottom of the body of water on which floats the boat.
  • boat mooring devices comprising a vertical shaft wells passing through the hull, which include a turret arranged in the well in a substantially coaxial arrangement relative to the well which is rotatably mounted, via its upper part, on the hull of the boat, around the vertical axis of the well.
  • Mooring means such as constituted mooring lines by chains are connected to the turret and are distributed around the axis of the turret, so as to oppose the drift of the turret, under the effect of transverse forces exerted on the boat. Because the turret is held in place, the boat, which is connected via a bearing to the upper part of the turret is held against forces transverse, so that any drift of the boat is avoided. The boat does can only rotate around the axis of the turret, because it is rotatably mounted relative to the turret via the upper bearing.
  • the object of the invention is therefore to propose a mooring device for a floating structure having a hull crossed by a shaft well vertical, comprising a turret arranged in the well and rotatably mounted by its upper part on the hull of the floating structure, around the vertical axis of the well, mooring means distributed around the axis of the turret, each having a lower part extending towards the bottom of a body of water on which the floating structure and part of it are supported upper connected to a link member mounted movable in one direction radial with respect to the well and the turret, this device making it possible to resume the transverse forces and the torque exerted by the floating structure, without risk of damage to the means of connection mooring.
  • each of the connecting members includes a key housed in a radial direction notch in a peripheral part a horizontal table constituting a lower part of the turret, so that the key to which is connected at least one mooring means either movable in a radial direction relative to the turret table and relative to the inner wall of the vessel well.
  • the key is pivotally suspended from the turret, by means of at least one tie rod having connecting axes articulated with the turret and the key, horizontal direction
  • Figure 1 is a schematic elevational view in partial section of a boat comprising a mooring device according to the invention.
  • Figure 2 is an elevational view in section through a vertical plane of the part of a mooring device according to the invention and according to a first embodiment arranged in the vertical well of the boat.
  • Figure 3 is a sectional view along 3-3 of Figure 2.
  • Figure 4 is a sectional view similar to the view of Figure 2 of an alternative embodiment of the mooring device.
  • Figure 5 is an elevational view in partial section along 5-5 of Figure 6 of the upper part of an articulated connecting member of the device mooring.
  • Figure 6 is a top view of the upper part of the device articulated link shown in Figure 5.
  • Figure 7 is a top view and in section through a horizontal plane of the lower part of an articulated connecting member of the mooring device.
  • Figure 8 is a sectional and elevational view along 8-8 of the figure 7.
  • FIG. 1 there is shown a boat with a device mooring according to the invention, generally designated by the reference 1.
  • the boat 1 has a hull 2 crossed by a vertical well 3 the upper part of which opens into the open air, at the level of an upper deck 4 of hull 2 of boat 1.
  • the vertical well 3 opens, at its lower part, through the bottom of the hull 2 of the boat 1, in the sea water 5 on which the boat floats 1.
  • Sea water 5 fills the vertical well 3, up to a corresponding level 6 at the waterline of the boat.
  • the height in the axial direction of the central part of the shell 2 and therefore the length of the well in the axial direction are of the order of 30 meters.
  • the well has a diameter of the order of 7 to 8 meters.
  • the boat mooring device 1 comprises a turret 7 of generally cylindrical shape arranged coaxially inside the well 3 and mooring lines 8 connected to connecting parts at level from the lower end of the turret 7, as will be explained thereafter with reference to FIGS. 2 and 3.
  • Each of the mooring lines 8 which is constituted by a set very long chains (several kilometers or more tens of kilometers) is made up of very large links and significant mass.
  • Each of the mooring lines 8 has a lower part 8a extending towards the bottom 9 of the sea 5 which is made up of chains which are generally attached to anchors on the sea floor 9, at their end part resting on the bottom of the sea.
  • Each of the lines 8 has an upper end portion 8b which is connected to a connecting member at a lower end portion of the turret 7, as will be described below.
  • the anchor lines 8 are distributed around the axis 10 of the vertical well 3, so as to maintain the turret 7 in a position substantially fixed relative to the bottom 9 of the sea 5.
  • the device mooring has three anchor lines each consisting of four chains, the upper end parts of which are connected to connecting members at the level of the lower part of the turret 7, in three zones distributed around the axis 10 of the turret and the vertical shaft 3, whose positions are located 120 ° from each other around the axis 10.
  • the turret 7 comprises an upper table 11 constituted by a very thick rigid circular structure, perpendicular to the vertical axis 10 of the turret, by means of which the turret 7 is rotatably mounted on the upper part of the hull 2 of the boat, around the axis 10 vertical well 3, using a roller crown 12.
  • the roller crown 12 is fixed by means of a support 12a on the upper part of the hull 2 of the boat, the support 12a comprising an annular support plate which is fixed by screwing on the upper part of the shell 2, around from the upper end of well 3.
  • the roller ring 12 includes a set of rollers 13a with horizontal axes mounted on the internal lower part of the crown 12, on which the upper table 11 of the turret rests 7.
  • the rolling ring 12 also includes a set of rollers bearing 13b with horizontal axes fixed on the internal upper part of the crown 12, coming to bear on the upper surface of the table 11.
  • the crown 12 includes a set of rollers 13c with axes vertical fixed on the internal cylindrical surface of the crown 12 coming in contact with the outer cylindrical edge of the upper table 11. De in this way, the upper table 11 is perfectly maintained and guided rotating around the axis 10 of the vertical well 3.
  • the roller crown 12 can be made in one piece.
  • the diameter bearing of the crown 12 is greater than 7 meters, it can be necessary to make the roller crown 12 in several sectors which are assembled and fixed on the support 12a.
  • the lower end part of the turret 7 is constituted by a circular table 14 at which the upper ends of the lines anchor 8 are connected to connecting members in the manner which will be explained later.
  • the diameter of the table 14 is significantly less than the diameter inside the well 3, so that there remains a free space of a certain width between the peripheral edge of the table 14 and the internal surface of the lower part of the well 3.
  • a support bearing 15 is fixed, in a coaxial arrangement, against the internal surface of well 3, in its lower part, opposite the table 14. However, there remains a radial clearance of the order of 30 mm between the surface external device of the table 14 and the internal bearing surface of the bearing 15.
  • the turret 7 is produced in a circular hollow form, such so that we can pass inside, in the vertical direction, tubes or pipes from the upper part of the hull 2 of the boat, towards the bottom of the sea.
  • the table 14 constituting the lower part of the turret 7 comprises, in its peripheral part, three notches 16 of radial direction opening out on the outer peripheral surface of the table 14 and extending along the entire thickness of the table 14.
  • the notches 16 are arranged in three zones of the table 14 including the positions are located at 120 ° from each other around the axis 10 of turret 7.
  • each of the notches 16 in the peripheral part of the table 14 is arranged a key 17 to which the ends of the chains constituting an anchor line 8.
  • the key 17 has a width in the circumferential direction slightly less than the width of the notch 16, so that the key 17 is freely mounted inside the notch 16, which allows it to be move in the radial direction of the turret 7, towards the surface internal of the bearing 15 fixed to the lower part of the well 3, facing the table 14.
  • the key 17 has a length in the direction radial less than the radial length of the notch 16, so that the key has a certain radial clearance inside the notch 16, between the rear surface 16a of the notch 16 and the internal surface 15a of the level 15.
  • Each of the keys 17 is suspended from the upper table 11 of the turret 7, by means of a suspension tie rod 18.
  • the suspension tie rod 18 is mounted articulated at one of its ends on the upper table 11 and at its other end on the key 17, around respective horizontal axes 18a and 18b.
  • the upper table 11 of the turret 7 is crossed by an opening 19 of reinforced rectangular shape at the periphery by a frame 20 of rectangular current section.
  • T-shaped suspension plates 21 which are welded on the frame 20.
  • the suspension plates 21 delimit successive spaces inside the frame 20 in each of which can be mounted pivoting a link 38 made up of two parallel arms 38a and 38b suspended from a shaft 22 mounted and stopped in rotation between two plates 21.
  • the spacing between the arms 18a and 18b is maintained by a spacer tube 23 engaged on the shaft 22.
  • Each of the tie rods 18 mounted pivoting about a horizontal axis at the interior of the frame 20 ensures the suspension of a key 17 in which are received and fixed the ends of the chains of an anchor line 8.
  • each of the anchor lines has four chains
  • the key 17 is suspended from the upper table 11 of the turret 7, by means of four links 18 each comprising two arms 38a and 38b parallel to each other and arranged with a certain spacing.
  • the key 7 is made in the form of a box of substantially parallelepiped shape having an external wall 17a directed towards a bearing and sliding surface 15a of bearing 15, the shape of which in portion of a cylinder corresponds to the shape of the bearing surface of the bearing 15 disposed opposite.
  • the key 17 also has walls 17b parallel to each other and substantially perpendicular to the support wall 17a of the key.
  • the walls 17b delimit between them successive spaces in each of which penetrates the lower end part of a link 38.
  • the walls 17b are interconnected and held by ribs 24.
  • Each of the walls 17b has, at its rear end opposite to the support wall 17a, a recess for the engagement of two ends shaft 25 integral with the body 26 of a tubular chain guide device 27.
  • the shaft ends 25 are held in half bores (cut diametral) on the walls 17b, by caps 28 having the other half-bore and fixed by screws to the walls 17b.
  • each of the rods 18 arranged in a space between two successive walls 17b is hingedly connected to the key 17 and the chain passage device 27 of tubular shape which is fixed in an opening passing through the body 26.
  • the rods 38 which are fixed by their lower part, so articulated, with key 17, about a common horizontal articulation axis 29 constitute a tie rod 18.
  • the devices for guide chains 27 or "fairleads" are produced in tubular form and successively comprise a frustoconical engagement part of a chain and a coaxial cylindrical part engaged in the opening of the body 26 in a direction 30 inclined to the horizontal plane.
  • the angle of inclination of the axes of the fairleads 27 is at least equal to 20 °.
  • Each of the fairleads 27 has an enlarged end flange diametrically 31 in its end part located at the rear of the link 38.
  • a slide 32 On the flange 31 is fixed a slide 32 on which is mounted sliding, in a direction perpendicular to the axis of fairlead 27, a wedge 33 having a central opening in which the part is housed lower of the first link of the anchor chain 34, in the position of blocking of the shim 33, as shown in FIG. 8.
  • Shim 33 can be moved between a low position out of service in which the shim 33 is supported on the lower part of the slide 32 constituting a support heel and a high service position shown in Figure 8 in which the wedge 33 ensures the blocking of the chain 34 of the mooring line.
  • the opening of exit from fairlead 27, at the flange 31, is free, so that can move the chain inside the fairlead, by pulling in the direction 30 to ensure the tension of the anchor line, for example by using a winch carried by the hull 2 of the boat.
  • Each of the chains 34 introduced into a guide fairlead 27 connected to the key 17 is tensioned and then blocked by a similar stop piece at stop 33.
  • the upper end of the anchor line, the fairlead and the landing 15 are immersed in the body of water on which the boat 2 floats. done, the part 33 is not accessible and its movements between its position out of service and its service position is achieved using a motor remotely controlled, for example from the upper deck of the boat.
  • the vertical side surfaces in the radial direction of the notch 16 of the table 14 are each covered an anti-friction lining 14a or 14b.
  • Key 17 is mounted sliding between the linings 14a and 14b, practically without play, so that the key 17 recalled in the radial direction by the mooring line 8 can only move in the radial direction, and only the outer surface of the front wall 17a of the key 17 comes to bear against the internal surface 15a of the bearing 15 covered with an anti-friction lining 15c constituting a sliding surface of the keys during movement relative in rotation of the boat and the turret.
  • the inclination of the anchor lines 8, which corresponds to the angle of inclination of the axis 30 of the fairleads 27, is chosen so that part predominant of the horizontal component of the force exerted by the lines mooring is exerted directly on the internal surface of the bearing 15 integral from the hull well.
  • the angle of the axis 30 of the fairleads with the horizontal plane can be between 20 ° and 80 °.
  • each rod of the tie rod 18 is articulated to one of its ends on the upper table 11 of the turret 7, around an axis 18a horizontal, allows movement by pivoting in the radial direction of the key 17 towards the internal surface 15a of the bearing 15.
  • the support keys against the surface 15a of the bearing 15 prevents impacts from occurring between table 14 of turret 7 and bearing 15 of well 3 and between rear surface of the keys and the rear surface of the notches 16.
  • the key 17 can be oriented so as to come in perfect support against the internal surface 15a of the bearing 15.
  • the key 17 is mounted practically without play inside of the notch 16 of the table 14, so that all of the couples acting on the turret 7, due to the couples exerted by the shell 2 are taken up at table 14, and transmitted directly to the mooring lines 8. This avoids transmitting torques to the upper bearing 12 of turret 7.
  • the torques are taken up by mooring lines 8, directly at level of the lower table 14, via the keys 17, the lines mooring 8 and the notches 16 of the table 14 in which the keys are placed being distributed around the axis 10 common to the vertical well 3 and turret 7.
  • the keys 17 are made of a corrosion-resistant material by seawater, such as a nickel alloy or ferritic iron silicon.
  • the keys 17 are mounted completely free inside the notches 16 of table 14 and have only one latitude of movement in the radial direction.
  • Figure 4 there is shown an alternative embodiment of the device mooring.
  • the corresponding elements in Figures 2 and 4 bear the same references with, however, the exhibitor '(prime) with regard to the elements of the variant embodiment shown in FIG. 4.
  • the mooring device is similar, in its general structure, to mooring device described with reference to FIG. 2 and comprises a turret 7 'rotatably mounted via a crown 12' inside the well 3 'passing through the hull 2' of a boat.
  • the lower table 14 'of the turret 7' has notches 16 ' in each of which is inserted a key 17 '.
  • the 16 'notches and the keys 17 ' are distributed around the axis 10' common to the turret 7 ' and to the well 3 'and each of the keys 17' is integral with the upper part an 8 'mooring line.
  • the notches 16 'in the same way as the notches 16 of the device shown in Figure 2 have a length in the radial direction greater than the radial length of the keys 17 ', so that the keys 17 'are mounted with a certain clearance between the rear surface 16'a of the notch 16 'and the internal surface 15'a of the bearing 15' integral with the internal surface of the well 3 'in its lower end part.
  • the keys 17 ' are mounted articulated at the end of tie rods 18' which can be constituted, as before, by a set of rods parallel to each other and each consisting of two parallel arms.
  • the 18 'tie rods suspension 17' are not fixed to the upper table 11 'from the turret 7', at their upper part, but on ears 35 integral with the body of the turret 7 'and arranged at 120 ° from one another around from the axis 10 'of the turret.
  • the upper axis 18'a of articulation of the tie 18 'on the turret 7' is at a level substantially lower than the level of the upper table 11 '. This avoids the use of very long rods (for example of the order of 30 m), the ears 35 and the axes 18'a being placed a few meters above the lower table 14 '.
  • the pivot angle of the tie rods 18 'for obtaining the support of the keys 17 'on the bearing 15' is greater than the angle of pivoting in the case where the upper link of the tie rod is placed at the upper level of the turret.
  • the mooring lines 8 'distributed around the axis 10' recall the keys 17 'in the radial direction, against the surface interior 15'a of bearing 15 '.
  • the invention therefore generally makes it possible to avoid transmitting excessive forces or torques at the upper bearing of the turret 7 'and any risk of shock between the attachments of the mooring lines and the lower part of the turret.
  • the mooring lines are distributed regularly around the axis common to the hull well and the turret, so as to take up the torques and transverse forces exerted on the boat and through it on the turret kept immobile by the mooring lines.
  • the tie rods can consist of one or more rods rigid arranged in parallel or by one or more rods or cables arranged substantially vertically and connected at one of their ends to a part of the turret and at their other end to a key.
  • the tie rods can be connected to the turret, in any area of the turret, depending on its height, depending on the characteristics sought for the mooring device.
  • the tie rods consisting of rods or cables could be connected, by their upper part, to the hull of the boat, instead of being connected with the turret, to ensure the suspension of the keys.
  • the keys could also be mounted sliding in a radial direction on a horizontal part of the lower table of the turret ; in this case, the keys would be both housed between two surfaces lateral radial direction of the table and resting on the table. In in all cases, the keys can only move in the radial direction and are integral in rotation with the turret.
  • Mooring lines can be connected in any way on the keys, the use of fairleads, as described, allowing ensure effective guidance of the upper part of the components mooring lines.
  • the invention applies not only to boats used in the underwater oil exploitation but also in the case any floating structure used for offshore petroleum exploitation or in any other form of sea activity in which it is necessary to immobilize a floating structure, on the surface of the sea or ocean.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)
  • Bridges Or Land Bridges (AREA)
EP98402861A 1997-12-03 1998-11-18 Dockvorrichtung für eine schwimmende Struktur Withdrawn EP0921061A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9715241 1997-12-03
FR9715241A FR2771703B1 (fr) 1997-12-03 1997-12-03 Dispositif d'amarrage pour une structure flottante

Publications (1)

Publication Number Publication Date
EP0921061A1 true EP0921061A1 (de) 1999-06-09

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ID=9514116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98402861A Withdrawn EP0921061A1 (de) 1997-12-03 1998-11-18 Dockvorrichtung für eine schwimmende Struktur

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Country Link
EP (1) EP0921061A1 (de)
FR (1) FR2771703B1 (de)
NO (1) NO985615L (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2797843A1 (fr) 1999-09-01 2001-03-02 Dumez Gtm Barge mobile a jambes tendues pour travaux nautiques a moyennes profondeurs
RU2517634C2 (ru) * 2008-07-16 2014-05-27 Акер Пуснес Ас Якорная система

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61150891A (ja) * 1984-12-26 1986-07-09 Nippon Kokan Kk <Nkk> タレツトムアリング船
EP0656293A1 (de) * 1993-12-02 1995-06-07 Imodco, Inc. Turmsystem zur Festmachung eines Schiffes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61150891A (ja) * 1984-12-26 1986-07-09 Nippon Kokan Kk <Nkk> タレツトムアリング船
EP0656293A1 (de) * 1993-12-02 1995-06-07 Imodco, Inc. Turmsystem zur Festmachung eines Schiffes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 353 (M - 539) 28 November 1986 (1986-11-28) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2797843A1 (fr) 1999-09-01 2001-03-02 Dumez Gtm Barge mobile a jambes tendues pour travaux nautiques a moyennes profondeurs
WO2001015969A1 (fr) 1999-09-01 2001-03-08 Vinci Construction Grands Projets Barge mobile a jambes tendues pour travaux nautiques a moyennes profondeurs
RU2517634C2 (ru) * 2008-07-16 2014-05-27 Акер Пуснес Ас Якорная система

Also Published As

Publication number Publication date
NO985615D0 (no) 1998-12-01
FR2771703A1 (fr) 1999-06-04
NO985615L (no) 1999-06-04
FR2771703B1 (fr) 2000-02-25

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