WO2008077405A1 - Système d'amarrage pour stabiliser un navire, navire, procédé pour stabiliser un navire et utilisation d'un système d'amarrage - Google Patents

Système d'amarrage pour stabiliser un navire, navire, procédé pour stabiliser un navire et utilisation d'un système d'amarrage Download PDF

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Publication number
WO2008077405A1
WO2008077405A1 PCT/DK2007/000566 DK2007000566W WO2008077405A1 WO 2008077405 A1 WO2008077405 A1 WO 2008077405A1 DK 2007000566 W DK2007000566 W DK 2007000566W WO 2008077405 A1 WO2008077405 A1 WO 2008077405A1
Authority
WO
WIPO (PCT)
Prior art keywords
mooring
vessel
mooring system
unit
stabilizing
Prior art date
Application number
PCT/DK2007/000566
Other languages
English (en)
Inventor
Anders SØE-JENSEN
Original Assignee
Vestas Wind Systems A/S
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 Vestas Wind Systems A/S filed Critical Vestas Wind Systems A/S
Priority to EP07846436A priority Critical patent/EP2121424A1/fr
Publication of WO2008077405A1 publication Critical patent/WO2008077405A1/fr
Priority to US12/489,239 priority patent/US20090255454A1/en

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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
    • B63B21/24—Anchors
    • B63B21/26—Anchors securing to bed
    • B63B21/29—Anchors securing to bed by weight, e.g. flukeless weight anchors
    • 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
    • B63B21/24—Anchors
    • B63B21/30—Anchors rigid when in use
    • B63B21/32—Anchors rigid when in use with one fluke
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B63B39/062—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water the foils being mounted on outriggers or the like, e.g. antidrift hydrofoils for sail boats

Definitions

  • the invention relates to a mooring system for stabilizing a vessel for handling offshore structures, a vessel, a method of stabilizing a vessel for handling offshore structures and use of a mooring system.
  • Vessels for transportation and mounting of offshore structures to be installed on offshore locations are known in the art.
  • European patent EP 1 220 775 B discloses a vessel for transporting and mounting windmills on previously built structures on the seabed.
  • the vessel comprises at least four vertically elevational support legs mounted in consoles connected to the hull for the support of the vessel on the seabed.
  • German patent DE 100 21 163 B discloses a vessel comprising four vertically elevational support legs, two by two connected to lift tanks.
  • the lift tanks can be elevated to contact with the seabed whereby the vessel can be lifted above the waterline with its lift tanks resting on the seabed.
  • a disadvantage of the described vessels is that they are sensible to seabed conditions due to seabed penetration when jacked up.
  • rigid vertically elevational support legs are used which in its construction is a relatively complicated set-up.
  • the vessel comprises a floating drilling rig component and a support barge component.
  • the barge component comprises a ballast system including pumps that is able to ballast the vessel to rest on the bottom of a water body. Furthermore the barge component comprises a substantially planar bottom.
  • a disadvantage for the described converted vessel is that it is a complicated and non- flexible setup regarding the construction of the support barge component that must be specific designed to the drilling rig component to which it supports.
  • the invention relates to a mooring system for stabilizing a vessel for handling offshore structures where said system comprise at least one mooring unit, connection means for connecting said mooring unit to said vessel, and tractive means for stabilizing said vessel by establishing permanent tension in said connection means. Furthermore said tractive means comprises means for lowering said connected vessel's position in relation to the water level.
  • vessel any types of boat, ship, craft or the like that is suitable and/or can be arranged for the purpose of handling offshore structures.
  • mooring unit is meant a unit that is not a part of the vessel and is free to operate in relation to the hull of said vessel.
  • the mooring unit can be mobile or established at a fixed position.
  • tractive means means that is able to establish tension in attached connection means.
  • Tractive means also comprises means that is able to regulate and/or dynamically control the established tension in the connection means.
  • connection means By the terms permanent tension is meant that the tension in said connection means is applied without interruption when said mooring system is in use but the tension force can be altered, controlled, regulated and/or adjusted during use i.e. the tension force is not constant in relation to time.
  • stabilizing said vessel in relation to the present invention is meant that the vessel can be held in positions in such a way that the influence on the movement of the vessel in all directions due to environmental parameters such as waves, tidal, current and/or wind is minimized.
  • said mooring system comprises means for changing the buoyancy of said at least one mooring unit.
  • the mooring unit or units can form a sufficient and desired counterweight as to establish a sufficient permanent tension in the connection means.
  • the buoyancy of the mooring unit or units can be altered as to adapt to different situations such as installation on vessel, transportation to offshore site, operation on site etc.
  • said means for changing the buoyancy comprises means for changing a filler of said mooring unit.
  • said means for changing a filler of said mooring unit comprises remotely operated valves and pumps.
  • the operation of changing a filler can be done from physical locations at a distance away from the mooring unit such as from said vessel, from an offshore installation such as an offshore wind turbine installation or a drilling rig.
  • the valves and pumps can be operated manually or by electrical control means.
  • said mooring unit comprises one or more cavities that can be fully or partly filled and drained with a filler such as air, water or sand.
  • a filler such as air, water or sand.
  • said mooring unit is demonstrating a floating behavior when it is substantially fully filled with air.
  • operations such as transportation of the unit can be done without requiring extra resources as to lift the weight of the unit.
  • the mooring unit can be stored in the water when it is not used without resting on the seabed.
  • the mooring unit can be stabilized in a preferred position below the water level e.g. during installation of a mooring system on a vessel.
  • said at least one mooring unit comprises at least one suction bucket system.
  • said connection means for connecting said mooring unit to said vessel comprise at least two separate connection units.
  • connection units are flexible pulling means such as wires, chains, ropes, cordage or the like, suitable for winding on a pulley, winch drum or the like.
  • said tractive means comprises one or more winches, pulleys and/or cranes.
  • said mooring unit is adapted to be positioned substantially at the bottom section of said vessel or in a hollow part of the vessel bottom section during transport.
  • the physical dimensions of said mooring system is designed as to optimize its hydrodynamic properties such as propulsion resistance.
  • said mooring system can be mounted and dismounted on different vessels.
  • the mooring system is versatile and can be used for a plurality of purposes.
  • said mooring unit is established and permanently located on the seabed.
  • said mooring unit is a mooring pole mounted on a monopole.
  • the mooring system is non-dependent on placing a mooring unit on the seabed, and hereby non-dependent on seabed conditions at the place of mooring.
  • no transportation of mooring unit or units is necessary which in turn extends the number and models of vessels suitable for operating with said mooring system.
  • the invention relates to a vessel for handling offshore structures comprising a mooring system according to any of the preceding claims.
  • a standard vessel can be converted to a vessel dedicated for handling offshore components such as wind turbine components for relative shorter time intervals.
  • the use of the vessel can be optimized as it can be used to alternating marine tasks.
  • the invention also provides a method for stabilizing a vessel for handling offshore structures, said method comprises the steps of:
  • the invention also relates to the use of a mooring system for a vessel.
  • fig. Ia illustrates schematically a mooring system according one embodiment of the invention, comprising a mooring unit elevated to a transporting position,
  • fig. Ib illustrates a mooring system according another embodiment of the invention, comprising a mooring unit elevated to a transporting position,
  • fig. Ic illustrates a mooring system according a further embodiment of the invention, comprising a mooring unit elevated to a different transporting position,
  • fig. 2 illustrates schematically a mooring system comprising one or more cavities
  • fig. 3 illustrates schematically a mooring system according to one embodiment of the invention, comprising a mooring unit submerged to rest on the seabed,
  • fig. 4 illustrates schematically a mooring system according to one embodiment of the invention during operation with a vessel in a lowered position
  • fig. 5 illustrates schematically a top view of one embodiment of the invention
  • fig. 6 illustrates connection means positioned in a non vertical manner
  • fig. 7a illustrates a top view of a mooring system comprising more than one mooring units
  • fig. 7b illustrates a mooring system comprising more than one mooring units submerged on the seabed
  • fig. 8 illustrates a mooring system according to an embodiment of the invention
  • fig. 9 illustrates a mooring system comprising suction buckets
  • fig. 10a illustrates a mooring system according to an embodiment of the invention
  • fig. 10b illustrates a mooring system according to another embodiment of the invention
  • fig. 11a illustrates a side view of a loading of a mooring system on a vessel
  • fig. l ib illustrates a top view of a loading of a mooring system on a vessel
  • fig. 12 illustrates a mooring system comprising an offshore structure with a pole
  • fig. 13 illustrates a mooring system comprising solid stationary blocks with a hook
  • fig. 14 illustrates connection means can be marked with floating buoys.
  • Fig. Ia illustrates according to one embodiment of the invention, a side view of a vessel 1 comprising a hull 2, a mooring system comprising tractive means 3 and a mooring unit 4 connected to the tractive means 3 by connection means 5.
  • lifting means such as one or more cranes (not illustrated) can be positioned for the purpose of e.g. loading and unloading of cargo such as wind turbine tower segments, nacelle, hub, rotor blades etc.
  • the cranes have properties such as loading capacity, working range etc. suited for wind turbine installation operation.
  • the vessel can comprise means for stowing of cargo.
  • the mooring unit 4 is elevated by tractive means 3 and connection means 5 to be located in close proximity to the vessel bottom section as illustrated in the figure.
  • the physical dimensions of the mooring system comprising at least one mooring unit 4 is designed as to minimize its hydrodynamic properties such as to lower its propulsion resistance during moving (transportation) along any direction of the vessel 1.
  • the mooring system is detachable. This means that the mooring system can be mounted and operated on numerous suited vessels. This also allows the vessel 1 to operate in other trades, i.e. the vessel 1 is further capable of performing conventional marine trades instead of being dedicated to e.g. offshore wind turbine tasks exclusively.
  • said connection means comprises wires, chains, ropes, cordage or the like, suitable for winding on a pulley, winch drum or the like.
  • Fig. Ib illustrates for another embodiment of the invention the hull 2 of a vessel 1 comprising a hollow part 13 in the vessel bottom section 10 where said mooring unit 4 can be located during non-operational use such as transportation, anchoring, towing etc. as to further minimize the propulsion resistance.
  • said mooring unit 4 is elevated by tractive means 3 and connection means 5 and transported when it is elevated and located at a distance below the vessel bottom section 13 but above the seabed 7 as illustrated in figure Ic.
  • Fig. 2 illustrates for one embodiment of the invention, part of the mooring system a mooring unit 4 comprising one or more cavities 9.
  • a mooring control system comprising valves controls the filling and draining of water and air, to and from one or more cavities 9 comprised in the mooring unit 4.
  • the weight and buoyancy of the mooring unit and thereby the tension in the connection means 5 can be controlled.
  • the mooring system comprises one or more mooring units 4 where the cavities 9 is part of a closed filling and draining system where the cavities can be filled with a liquid with a density greater than seawater.
  • the physical outlining of said mooring system may for any embodiments vary as to suit the various needs.
  • the cavities 9 in the mooring unit 4 is substantially fully filled with s suitable filler such as air, the mooring system demonstrates a floating behavior.
  • Fig. 3 illustrates schematically a vessel 1 according to one embodiment of the invention, comprising a mooring system on a working location and where a mooring unit 4 is submerged to rest on the seabed 7.
  • the length of the connection means 5 is increased to be substantially the distance between tractive means 3 comprised in the mooring system and the seabed 7.
  • Fig. 4 illustrates schematically for one embodiment of the invention a vessel 1 during stabilized positioning and operation.
  • the mooring unit 4 is submerged to the seabed 7 and the cavities 9 in the said mooring unit 4 are substantially fully filled with a filler such as water whereby the buoyancy of the mooring unit 4 is minimized.
  • a mooring control system controls the tension in the connection means 5 e.g. by operating tractive means 3.
  • the vessel 1 is substantially dragged vertical towards the seabed 7.
  • the waterline on the vessel 1 in non-stabilized condition 8 is displaced to occur below the water level 6 whereby a new waterline 12 on the vessel in stabilized condition is introduced.
  • the difference that can be obtained between the waterline in non-stabilized condition 8 and in stabilized condition 12 i.e. 11 - 12 in a working condition depends on e.g. the weight and buoyancy of the mooring unit 4, the tension in connection means 5 and on various environmental parameters such as wind, waves, current and tidal.
  • the obtained difference can be in the range from 0.2 - 2.0 meters preferably in the range from 0.5 to 1.5 meters.
  • said mooring unit 4 is elaborated in a way that it enhances its properties regarding anchoring to the seabed 7 i.e. it is more difficult to move when it is exposed to dragging forces in the seabed plane directions.
  • Fig. 5 illustrates schematically a top view of one embodiment of a vessel 1 comprising a mooring unit 4 connected to the hull 2 by tractive means 3 and connection means 5.
  • the size of said mooring unit 4 depends on numerous factors such as size of vessel 1 , buoyancy of vessel 1 , seabed 7 condition, level of desired stabilization, weight of mooring unit 4, elaboration of mooring system etc.
  • connection means 5 are connected to the mooring system in a non-vertical manner as indicated in fig. 6 where it is shown that the distance between tractive means 3 connected to the hull 2 of a vessel 1 is smaller than the distance between attachment points of connection means 5 to a mooring unit
  • tractive means may even cross in either or both of the vessel 1 longitudinal and transversal directions.
  • connection means 5 are connected to tractive means 3 comprising hydraulic systems.
  • the permanent tension in the connection means 5 established by tractive means 3 is controlled dynamically as to compensate for changing environmental conditions such as tidal, current, waves, wind or the like or for other alternating demands such as desired water line level, desired tension in said connection means etc.
  • Said tension can be controlled manually and/or automatically by control means such as microprocessor based or PLC based.
  • control means can control on the basis of measuring said environmental parameters and using them as feedback to the control means. In other embodiments control is performed on the basis of lookup-tables, GPS measurements, data-communication with other control systems, manual loaded data, weather forecasts, predicted parameters etc.
  • FIGS 7a and 7b illustrates for one embodiment of the invention, a mooring system comprising a mooring unit 4 connected to the hull 2 of a vessel 1 by tractive means 3 and connection means 5.
  • This embodiment shows a mooring unit 4 that is divided into a plurality of sub-segments 4a. Each sub-segment 4a can be individually controlled regarding changing of filler and/ or tension in connection means 5.
  • Figure 7a illustrates this embodiment seen from a top view
  • fig. 7b illustrates the embodiment from a side view.
  • Figure 8 illustrates an embodiment of the present invention where two sub-segments 4a are placed on the seabed 7 and tension in connection means 5 is controlled by tractive means 3.
  • the connection means 5 extends in a non- vertical direction.
  • Figure 9 illustrates another embodiment of the present invention where a mooring system comprises a suction bucket system 14 located on the seabed 7.
  • a suction bucket 14 can be located on the seabed 7 with the "open end" downwards and when suction is applied to the bucket 14 it tend to penetrate the seabed 7. When the suction bucket 14 has penetrated the seabed 7 to the desired depth suction is removed.
  • Means for applying suction to the bucket 14 is not illustrated but for one embodiment one or more hoses from one or more suction pumps located e.g. on the vessel 1 running to one or more suction buckets 14 are substantially integrated with one or more connection means 5 as to form an umbilical between the involved components.
  • one or more suction buckets 14 are used in combination with a mooring unit 4 and/or sub-segments 4a as to form a mooring system.
  • connection means 5 can be disconnected from the tractive means 3
  • connection means 5 can be stored in the water by holding the disconnected distal ends of the connection means 5 substantially near the surface of the water by one or more buoys.
  • the buoys also have the function of indicating the location of storage of the mooring unit 4.
  • Figure 10a and figure 10b illustrates schematically in top views and rear views of embodiments of the present invention how a mooring system can be loaded and/or connected to a vessel 1.
  • Figure 10a illustrates a preferred embodiment where tractive means 3 are attached directly to/on the hull 2 of the vessel 1.
  • Figure 10b illustrates another embodiment where tractive means 3 are attached on one or more booms 15 that are placed transversely over the entire vessel 1.
  • Figures 11a and l ib illustrates schematically for one embodiment of the invention how said mooring system can be loaded to a vessel 1.
  • the mooring system comprising one or more mooring unit 4, tractive means 3, booms 15 and connection means 3 can be held in position in a storage area.
  • the booms 15 are raised above the water level 6 and the connection means 5 and mooring unit 4 is lowered below the water level 6 to such a position that the vessel 1 can enter the gap between said booms 15 and said mooring unit 4 as schematically illustrated in figure 11a.
  • Figure 1 Ib illustrates schematically a top-view and a side view of the same situation where a vessel 1 is entering said gap between booms 15 and said mooring unit 4.
  • the booms 15 are lowered and attached to the hull 2 of the vessel 1.
  • said mooring system is floating during storage and/or loading.
  • FIG 11a and l ib furthermore illustrates another embodiment of the invention where said mooring system comprises a mooring unit 4 comprising piles 16 and hydraulic cylinders 17 that allow the booms 15 to be raised to a suitable height above water level 6 whereby it is possible for a vessel 1 to enter the gap between the booms 15 and the mooring unit 4.
  • a mooring unit 4 comprising piles 16 and hydraulic cylinders 17 that allow the booms 15 to be raised to a suitable height above water level 6 whereby it is possible for a vessel 1 to enter the gap between the booms 15 and the mooring unit 4.
  • the booms 15 can be jacked-up to a height above water level and the mooring unit 4 can be lowered below the water level 6 to such a position that the vessel 1 can enter the gap between said booms 15 and said mooring unit 4 while the mooring system is floating substantially by it self.
  • connection means 5 connected to said mooring system can be more than two dependent of the specific task.
  • the present invention furthermore comprises a control system comprising means for filling/draining of cavities 9 in said mooring unit 4, controlling tension in the connection means 5, controlling hydraulic cylinders 17 etc.
  • Fig. 12 illustrates schematically for yet another embodiment of the invention where said mooring unit is a mooring pole 19 established e.g. on a monopile 18 such as the tower of an offshore wind turbine.
  • Fig. 12 shows a vessel 1 during stabilized positioning and operation.
  • connection means 5 is attached to a mooring pole 19 established on a monopile 18.
  • the mooring pole 19 is adapted as to receive connection means 5 by e.g. a hook, anchor, sling, loop or the like.
  • the tension is operated by tractive means 3.
  • the monopole 18 has dimensions as to withstand the forces that act on it when a vessel 1 is moored and can for various embodiments comprise supporting structures between the mooring pole 19 and e.g. the monopole 18, the seabed 7, the foundation of a tower of an offshore wind turbine etc.
  • Fig. 13 illustrates for another embodiment of the invention said mooring system comprising mooring blocks 20 placed on seabed 7 at sites of operation.
  • Each mooring block 20 comprises a mooring hook 22 mounted on a solid block 21.
  • the connection means 5 is attached to mooring hook 22 by e.g. a hook, anchor, sling, loop or the like.
  • the tension is operated by tractive means 3.
  • the mooring blocks 20 are dimensioned as heavy as to remain steady on the seabed 7 when a vessel 1 is moored by said mooring blocks 20 by connection means 5 and increases the tension of said connection means 5 by operation of tractive means 3 according to the invention.
  • the mooring blocks 20 can be established at sites of operation e.g. at the time of an offshore wind turbine installation.
  • connection means 5 fixed to the mooring unit 4 such as mooring blocks 20 located on the seabed 7.
  • Said connection means can be marked with floating buoys 23 so that the connection means 5 can be located from the vessel 1 and be connected to the tractive means 3.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Wind Motors (AREA)

Abstract

L'invention concerne un système d'amarrage pour stabiliser un navire pour manipuler des structures en mer. Ledit système comporte au moins une unité d'amarrage, un moyen de connexion pour connecter ladite unité d'amarrage audit navire, et un moyen de traction pour stabiliser ledit navire par l'établissement d'une tension permanente dans ledit moyen de connexion. En outre, ledit moyen de traction comporte un moyen pour abaisser la position dudit navire connecté par rapport au niveau de l'eau. L'invention concerne également un procédé de stabilisation d'un navire, un navire pour manipuler des structures en mer et l'utilisation d'un système d'amarrage.
PCT/DK2007/000566 2006-12-22 2007-12-21 Système d'amarrage pour stabiliser un navire, navire, procédé pour stabiliser un navire et utilisation d'un système d'amarrage WO2008077405A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07846436A EP2121424A1 (fr) 2006-12-22 2007-12-21 Système d'amarrage pour stabiliser un navire, navire, procédé pour stabiliser un navire et utilisation d'un système d'amarrage
US12/489,239 US20090255454A1 (en) 2006-12-22 2009-06-22 Mooring System For Stabilizing A Vessel, A Vessel, Method For Stabilizing A Vessel And Use Of A Mooring System

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DKPA200601701 2006-12-22
DKPA200601701 2006-12-22
DKPA200700296 2007-02-27
DKPA200700296 2007-02-27

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/489,239 Continuation US20090255454A1 (en) 2006-12-22 2009-06-22 Mooring System For Stabilizing A Vessel, A Vessel, Method For Stabilizing A Vessel And Use Of A Mooring System

Publications (1)

Publication Number Publication Date
WO2008077405A1 true WO2008077405A1 (fr) 2008-07-03

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US (1) US20090255454A1 (fr)
EP (1) EP2121424A1 (fr)
WO (1) WO2008077405A1 (fr)

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DE102011109251A1 (de) * 2011-08-02 2013-02-07 Werner Möbius Engineering GmbH Katamaran-Ponton
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DE102008044633A1 (de) * 2008-08-27 2010-03-04 Clement, Jürgen Dämpfungssystem für eine schwimmfähige Struktur
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