NL2014835B1 - Sheerleg crane with motion reduction device. - Google Patents

Sheerleg crane with motion reduction device. Download PDF

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Publication number
NL2014835B1
NL2014835B1 NL2014835A NL2014835A NL2014835B1 NL 2014835 B1 NL2014835 B1 NL 2014835B1 NL 2014835 A NL2014835 A NL 2014835A NL 2014835 A NL2014835 A NL 2014835A NL 2014835 B1 NL2014835 B1 NL 2014835B1
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NL
Netherlands
Prior art keywords
vertical
limiting device
bow
hoisting
movement
Prior art date
Application number
NL2014835A
Other languages
Dutch (nl)
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NL2014835A (en
Inventor
Jan Grundlehner Gerrit
Original Assignee
Boskalis Bv Baggermaatschappij
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Application filed by Boskalis Bv Baggermaatschappij filed Critical Boskalis Bv Baggermaatschappij
Priority to NL2014835A priority Critical patent/NL2014835B1/en
Publication of NL2014835A publication Critical patent/NL2014835A/en
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Publication of NL2014835B1 publication Critical patent/NL2014835B1/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
    • B63B21/27—Anchors securing to bed by suction
    • 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 
    • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
    • B63B43/04—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability
    • B63B43/06—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability using ballast tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/52—Floating cranes
    • 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
    • B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/28—Barges or lighters

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

Abstract

Assembly of a sheerleg crane and a motion reduction device that is connected to the sheerleg crane, wherein the sheerleg crane comprises a hull with a bow and a stern, wherein the motion reduction device comprises at the bow a portside vertical anchor and a starboard vertical anchor and for each vertical anchor a hoisting device with a hoisting chain or hoisting cable from which the vertical anchors are suspended, wherein the hoisting devices are configured for lowering the vertical anchors to and raising the vertical anchors from the bottom of the water body in which the hull floats.

Description

NLPI96708
Sheerleg crane_with motion reduction device BACKGROUND
The invention relates to a floating sheerleg crane. A sheerleg crane is used for nearshore or inshore lifting operations. A sheerleg crane comprises a hull with a bow and a stern, and a crane with a boom and a hoisting provision connected, to the boom, wherein in an extended pivot position of the boom the crane extends with its hoisting provision only in front of and beyond the bow.
The hull is subject to waves, During- the lifting operations the hoisting provision follows the motions of the hull caused by the waves. Due to the extended position of the hoisting provision beyond to the front edge of the hull, the motions thereof are even amplified. For this reason a sheerleg crane can in practice only be employed at a clam or smooth sea state, where the wave height has a maximum of about 0,75 meter and the wave period has a maximum of about 5 seconds. These conditions are typically only met at nearshore or inshore water areas. Above such sea state, there is a change of uncontrolled motions of the load.
It is an object of the present invention to provide a provision to allow the employment of a sheer leg c r a ne o £ f s h ore.
SUMMARY’ OF THE INVENTION
According to a first aspect, the invention provides an assembly of a sheerieg crane and a motion reduction device that is connected to the sheerieg crane, wherein the sheerieg crane comprises a hull with a bow and a stern, and a crane with a boom and a hoisting provision connected to the boom, wherein near the bow the lower side of the boom is pivotably connected to the hull to pivot the opposite upper side in the direction from the stern to the bow and vice versa and not transverse thereto, wherein in an extended pivot position of the boom the crane extends with its hoisting provision in front of and beyond the bow, wherein the motion reduction device is a separate unit or ai set of separate units that is detachably connected or connectable to the hull, wherein the motion reduction device comprises at the bow a portside vertical anchor and a starboard vertical anchor and for each vertical anchor a hoisting device with a hoisting chain or hoisting cable from which the vertical anchors are suspended, wherein the hoisting devices are configured for lowering the vertical anchors to and raising the vertical anchors from the bottom of the water body in which the hull floats.
The motion reduction device places its vertical anchors onto the bottom of the water body in which the hull-floats, Vertical anchors are configured to provide holding capacity in vertical direction with respect to the bottom of the water body. By keeping the hoisting chains or hoisting cables under tension, a temporary fixed relation is formed between the bow and the bottom of the water body. The fixed relation can for example be obtained by keeping the paid out length of the chains or cables between the hull and the vertical anchors constant. Due to this fixed relation the bow does not respond to waves anymore in vertical direction. This fixation is limited by the holding capacity of the vertical anchors. The fixed relation can be used to improve the accuracy of a hoisting operation or to employ the sheerieg crane offshore at a heavier sea state, while keeping the motions of the load under control. The stern of the hull may still respond to the waves, but as the stern is further removed from the hoisting provision, the impact thereof is less significant.
The motion reduction device can be employed when necessary, for example In areas with a heavier sea state or when a low motion response is required. The use of such motion reduction device is not limited to sheerleq cranes. Any kind of stationary floating working vessel, for example a crane barge, can be stabilized with such motion reduction device.
In an embodiment thereof the motion reduction device comprises a floating body that provides positive buoyancy to the entire motion reduction device. This enables the floating body to be connected, to the hull at seam The motion reduction. device can be transported separately to the sheerleg crane, for example by tugs or by its own propulsion. in an embodiment the motion reduction device comprises an accommodation space for the bow, whereby the bow can be inserted into the motion, reduction device and connected.
In an embodiment the motion reduction device comprises a ballast tank and a water pump to change the amount of water inside the ballast tank. When the vertical anchors are placed onto or into the bottom of the water body, the assembly of the sheerleg crane and the motion reduction device significantly gains positive buoyancy, which can be compensated by filling the ballast tank. In this way the tension in the hoisting chains or hoisting cables during a hoisting operation can be controlled. The tension can also be controlled by adjusting the paid out length of the chains or cables. in an embodiment the ballast tank is located below the bow, whereby it is fully submerged.
In an embodiment the ballast tank is located between the hoisting devices.
In an embodiment the motion reduction device comprises accommodation spaces for the vertical anchors, wherein the vertical anchors are accommodated in the accommodation spaces when fully raised by the hoisting devices ,
In an embodiment the vertical anchor is a ballast with significant negative buoyancy. This provides gravity based vertical anchoring by placing the ballast onto the bottom of the water body. A ballast can be employed on all kinds of anchoring grounds.
Alternatively, the vertical anchor is a suction anchor or suction caisson, which has a good vertical anchoring capacity in a sand bottom or a bottom with soft clays or other low strength sea beds.
In an embodiment the ballast tank is located between the accommodation spaces for the vertical anchors, whereby the ballast tank can be emptied to gain enough positive buoyancy and stability to carry the retracted vertical anchors.
In an embodiment the motion reduction device comprises a buoyancy chamber above the vertical anchor, whereby these buoyancy chambers keep the motion reduction device stably upright to be connected to the bow.
In an embodiment the buoyancy chambers extend aside the hull.
In an embodiment the buoyancy chambers extend aside the accommodation space for the bow to position the motion reduction device with its accommodation space ready to receive the bow.
In an embodiment the ballast tank is located under the accommodation space for the bow to ensure that it is positioned completely below the water line.
According to a second aspect, the invention provides a method method for reduction of the motion of a sheerleg crane in response to waves by means of a motion reduction device that is connected to the sheerleg crane, wherein the sheerleg crane comprises a hull with a bow ana a stern, and a crane with a boom and a hoisting provision connected to the boom, wherein near the bow the lower side of the boom is pivotably connected to the hull to pivot the opposite upper side in the direction from the stern to the bow and vice versa and not transverse thereto, wherein in an extended pivot position of the boom the crane extends with its hoisting provision in front of and beyond the bow, wherein the motion reduction device is a separate unit or a set of separate units that is detachably connected or connectable to the hull, wherein the motion reduction device comprises at the bow a portside vertical anchor and a starboard vertical anchor and for each vertical anchor a hoisting device with a hoisting chain or hoisting cable from which the vertical anchors are suspended, wherein the hoisting devices are configured for lowering the vertical anchors to and raising the vertical anchors from the bottom of the water body in which the hull floats, wherein the method comprises connecting the motion reduction device to the bow before a. lifting operation with the hoisting provision, lowering the portside vertical anchor and the starboard vertical anchor onto the bottom of the water body and keeping their hoisting chains or hoisting cables under tension during the lifting operation that is executed with the hoisting provision.
The motion reduction device places its vertical anchors onto or into the bottom of the water body in which the hull floats. By keeping the hoisting chains or hoisting cables under tension, a temporary fixed relation is formed between the bow and the bottom of the water body. The hoisting chains or hoisting cables can be kept under tension by using the hoisting devices or by using ballast tanks inside or outside the hull. This provides the advantages with respect to the response to waves and the low motion response during a hoisting operation as described before.
In an embodiment the motion reduction device comprises a ballast tank and a water pump to change the amount of water inside the ballast tank, wherein the method comprises filling the ballast tank with an amount of water after lowering the portside vertical anchor and the starboard vertical anchor onto the bottom of the water body .
According to a third aspect, the invention provides a motion reduction device for reduction of the motion of the hull of a stationary working vessel, such as a sheerleg crane or crane barge, in response to waves, wherein the motion reduction device comprises a floating body that provides positive buoyancy to the entire motion reduction device, an attachment provision to attach the motion reduction device to the hull of the working vessel, a portside vertical anchor and a starboard vertical anchor and for each vertical anchor a hoisting device with a hoisting chain or hoisting cable from, which the vertical anchors are suspended, wherein the hoisting devices are configured for lowering the vertical anchors to and raising the vertical anchors from the bottom of the water body in which the hull or the motion reduction device floats.
The motion reduction device according to the invention can be employed to stabilize any kind of stationary floating working vessel in the way as described before. As the motion reduction device has positive buoyancy, also when the vertical anchors are retracted, it can float through the water towards the working vessel to be connected thereto. The connection is accomplished by using the attachment provision.
In an embodiment thereof the vertical anchor is a ballast with significant negative buoyancy.
Alternatively, the vertical anchor is a suction anchor or suction caisson.
In an embodiment the motion reduction device comprises a ballast tank and a water pump to change the amount of water inside the ballast tank. This allows the motion reduction device to increase and decrease its buoyancy. An increase allows it to retract and carry its vertical anchors, and a decrease allows it to trim the tension in the hoisting chains or hoisting cables. The hull may then be located lower than when the motion reduction device is not employed.
In an embodiment the ballast tank is located under the accommodation space for the hull to ensure that it is fully submerged.
In an embodiment the motion reduction device comprises a buoyancy chamber above the vertical anchor to keep the accommodation space well positioned to be attached the hull.
The various aspects and features described and shown in the specification can be applied, individually, wherever possible. These individual aspects, in particular the aspects and features described in the attached dependent claims, can be made subject of divisional patent applications .
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be elucidated on the basis of an exemplary embodiment shown in the attached drawings, in which:
Figures 1A-1C are a side view, a detailed side view and a front view of a sheerleg crane with a motion reduction device according to an embodiment of the invention; and
Figures 2A and 2B are a front view and a side view of the motion reduction device before employment.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1A shows an overview of a self-propelled sheerleg crane 1 to which a motion reduction device 50 according to an embodiment of the invention is attached. The sheerleg crane 1 comprises a hull 2 floating horizontally at the water line 3 of a water body 4. The hull 2 comprises a deck 6 with a generally rectangular outline, two straight side walls 9, a stern 12 ana a bow 10 having a straight front edge 11 that extends perpendicular to the side walls 9, The sheerleg crane 1 comprises propulsion 13 at the stern 12 and side thrusters 14 at the bow 10. On the deck 8 there is an accommodation 15.
The sheerleg crane 1 comprises an A-frame boom 21 that is at its lower side pivotably connected to deck supports 20 at the bow 10. When seen in the vertical projection towards the deck 8, the boom 21 can only pivot with its upper side in linear direction between the stern 12 to the bow 10 and vice versa to corae in front of and beyond the front edge 11. The position of the A-frame boom 21 is adjusted and fixated by multiple guy-wires 27 that are connected to deck supports 29 and winches at the stern 12. In this embodiment the sheerleg crane 1 also comprises a jib 22 that is pivotably connected to the upper side of the boom 21. The position of the jib 22 with respect to the boom 21 is adjusted and fixated by means of guy-wires 2 5 that run over an auxiliary A-frame 23 behind the jib 22 and that are connected to deck supports 2 6 and winches at the middle of the hull 2, At the upper ends of the boom 21 and the jib 22 hoisting cables are provided of which only the furthest hoisting cables 24 at the end of the jib 22 are schematically shown.
The sheerleg crane 1 is configured for nearshore and inshore lifting operations, in which the load is hoisted by the hoisting cables 24 in front of and beyond the front edge 11 of the hull 2. The lifting capacity is typically between 50 and 5000 tons. During the lifting operations the hull 2 is trimmed with respect to the water line 3 by filling or emptying internal ballast tanks that are located at the stern 12. By trimming, the hull 2 is kept horizontally while the overall draft is amended. The sheerleg crane 1 as such is known in the art. heave of the hull 2 caused by waves. Due to the extended position of the tip beyond to the front edge 11 of the hull 2, the amplitude of the tip is even amplified. For this reason the sheerleg crane 1 can in practice only be employed at a calm or smooth sect state, typically with a maximum vertical wave amplitude of about 0,75 meter and a maximum wave period of about 5 seconds. Such sea state is in practice mainly present nearshore or inshore. Above this sea state the vertical position of the load with respect to the waterline 3 or a fixed understructure is not sufficient accurate anymore. In order to be able to employ the sheerleg crane 1 at heavier sea conditions that are typically present offshore, the sheerleg crane 1 is connected to a motion reduction device 50 according to the invention. The motion reduction device 50 is shown in more detail in figures 1B--2B.
The motion reduction device 50 comprises a hollow floating body 51 with a rectangular of box shaped outline that is formed with steel plates that are welded to each other along the meeting edges. The floating body 51 comprises a central accommodation space 52 for the accommodation of the bow 10 of the sheerleg crane 1. The accommodation space 52 is bounded by two opposite inner side walls 53 and an inner bottom wall 55. On the inner bottom wall 55 two supports 54 are provided that come into contact with the bottom wall of the bow 10. Opposite thereto two schematically indicated clamps 60 are provided that project from the inner side walls 53 to come into contact with the upper side of the bow 10.
The floating body 51 comprises below the inner bottom wall 55 a ballast tank 70 between two accommodation chambers 71. The ballast tank 7 0 can be filled with water or emptied by pumps that are not shown. Above the inner bottom wall 55 the floating body 51 comprises two buoyancy chambers 73 above the accommodation chambers 71 and two chain channels 74 that debouche into the accommodation chambers 71. At the upper ends of the chain channels 74 the motion reduction device 50 comprises a powered sprocket drive 76. In the accommodation chambers 71 a starboard side vertical anchor 72 and a portside vertical anchor 77 are suspended on a chain 7 5 that is fed through the chain channel 74 and over the sprocket drives 76 into the adjacent buoyancy chamber 73,
As best shown in figure 1C, the vertical anchors 72, 77 are in this embodiment ballasts 80 in the form, of concrete or metal blocks or holders that are filled with sand, concrete, ore, metal or any other heavy substance, whereby the mass of the ballasts 80 is significantly higher than their water displacement. The ballasts 80 can be employed on any kind of bottom 5. Alternatively, the vertical anchors 72, 77 are suction caissons or suction anchors 90 of which only one is schematically shown in figure 1C. The suction anchors 90 comprise a hollow body or cylinder 91 ana a cover 92 to define an inner space 94 that is accessible at the bottom side only. The suction anchors 90 comprise a suction pump 93 to withdraw water from the inner space 94. Suction anchors 90 can be employed on a sand bottom 5 or a bottom with soft clays or other low strength sea beds. All embodiments of the vertical anchors 72, 77 provide vertical holding capacity with respect to the bottom 5 or sea floor of the water body 4.
The motion reduction device 50 is employed in lifting operations in which a low motion response is required or when a sea state is expected that exceeds the maximum allowable wave amplitude for the sheerleg crane 1 as such. The motion reduction device 50 is then connected to the bow 10.
Figure 2A shows the motion reduction device 50 before connecting it to the bow 10. The vertical anchors 72, 77 are retracted into the floating body 51 and the ballast tank 70 is partially emptied to provide sufficient buoyancy to the floating body to keep the entire motion reduction device 1 afloat. The floating height is trimmed with respect to the bow 10 to allow easy insertion of the bow 10 into the accommodation space 52, The supports 54 are brought against the bottom of the bow 10 and the clamps 60 engage the opposite side of the bow 10. This is shown in figure 1C.
After connecting to the bow 10,, the suspended vertical anchors 71, 7 7 are lowered and placed onto the bottom 5 of the water body 4. In case of employment of the ballasts 80, the excess buoyancy of the floating body 51 caused thereby is partially compensated by filling the ballast tank 70 with water. In case of employment of the suction anchors 90, the hollow bodies 91 are positioned onto the bottom 5 and allowed to burry into it. The hollow bodies 91 are forced to penetrate into the bottom 5 by using the suction pumps 93. After penetration the suction anchors 90 provide and maintain sufficient vertical holding capacity, which can be released again by reversing the suction pumps 93.
The amount of water in the ballast tank 7 0 and the length of the chains 75 are adjusted such that the bow 10 is pushed down against its own buoyancy. The paid out length of the chains 75 then remains constant. The bow 10 is pushed down to such extend that the chains 7 5 remain under tension at the response to a trough of a wave and that the vertical anchors 71, 77 remain positioned onto or into the bottom 5 at the response to a peak of a swell wave. The chains 75 that are continuously under tension temporary provide a fixed height of the bow 10 with respect to the bottom 5 ana the water line 3. Thereby a stronger swell can be absorbed or the lifting operation can be executed with higher accuracy. The height of the stern 12 is adapted to the lower position of the bow 11 by filling or emptying the internal ballast tanks that are located at the stern 12.
The resistance against waves or the accuracy of a lifting operation can be improved further by connecting a second motion reduction device 50 to the stern 12 of the sheerleg crane 1. This second motion reduction device additionally provides a fixed height of the stern 10 with respect to the bottom 5 and the water line 3, whereby the sheerleg crane 1 practically does not respond to waves anymore in vertical direction, it is to be understood that the above description is included to illustrate the operation of the preferred embodiments and is not meant to limit the scope of the invention, From the above discussion, many variations will be apparent to one skilled in the art that would yet be encompassed by the spirit and scope of the present invention.

Claims (21)

1. Samenstel van een drijvende bok en een bewegin gsbeper ki ngs inricht ing die is gekoppeld aan de drijvende bok, waarbij de drijvende bok is voorzien van een romp met een boeg en een achtersteven, en een hijskraan met een giek en een hijsvoorziening die is gekoppeld aan de giek, waarbij de onderzijde van de giek bij de boeg zwenkend is gekoppeld met de romp om de tegengestelde bovenzijde in de richting van de achtersteven naar de boeg en terug te zwenken en niet dwars daarop, waarbij de kraan in een uit staande zwenkstand van de giek zich met zijn hijsvoorziening voor en buiten de boeg bevindt, waarbij de bewegingsbeperkingsinrichting een separate eenheid of een set van separate eenheden is die afneembaar is gekoppeld aan of te koppelen is aan de romp, waarbij de bewegingsbeperkingsinrichting bij de boeg een verticaal anker aan bakboord en een verticaal anker aan stuurboord en voor elk verticaal anker een hijsinrichting met een hijsketting of hijskabel omvat waaraan de verticale ankers zijn opgehangen, waarbij de hijsinrichtingen zijn ingericht voor het neerlaten van de verticale ankers naar en het ophaken van de verticale ankers van de bodem van het waterlichaam waarin de romp drijft,1. Assembly of a floating goat and a movement barrier device coupled to the floating goat, wherein the floating goat is provided with a hull with a bow and a stern, and a crane with a boom and a hoisting device that is coupled to the boom, the underside of the boom at the bow being pivotally coupled to the hull to pivot the opposite top in the direction of the stern towards the bow and back and not transversely thereto, the crane being in an outward pivoting position of the boom with its hoisting provision in front of and outside the bow, wherein the movement limiting device is a separate unit or a set of separate units which is detachably coupled to or can be coupled to the hull, wherein the movement limiting device at the bow is a vertical anchor to port and a vertical anchor on starboard and for each vertical anchor a hoisting device with a hoisting chain or cable to which the vertical anchor are suspended, the hoisting devices being arranged for lowering the vertical anchors to and hooking up the vertical anchors from the bottom of the body of water in which the hull floats, 2. Samenstel volgens conclusie 1, waarbij de bewegingsbeperkingsinrichting een drijflichaam omvat dat een positief drijfvermogen verschaft voor de bewegingsbeperkingsinrichting,2. Assembly as claimed in claim 1, wherein the movement-limiting device comprises a floating body which provides a positive buoyancy for the movement-limiting device, 3. Samenstei volgens conclusie 1 of 2, waarbij de bewegingsbeperkingsinrichting een opneemruimte voor de boeg omvat,3. Composite according to claim 1 or 2, wherein the movement-limiting device comprises a receiving space for the bow, 4. Samenstei volgens een der voorgaande conclusies, waarbij de bewegingsbeperkingsinrichting een ballasttank en een waterpomp om de hoeveelheid water in de ballasttank te veranderen omvat.Assembly as claimed in any of the foregoing claims, wherein the movement-limiting device comprises a ballast tank and a water pump for changing the amount of water in the ballast tank. 5. Samenstel volgens conclusie 4, waarbij de ballasttank zich onder de boeg bevindt,Assembly as claimed in claim 4, wherein the ballast tank is located under the bow, 6. Samenstel volgens conclusie 4 of 5, waarbij de ballasttank zich tussen de hij sinrichtingen bevindt,Assembly according to claim 4 or 5, wherein the ballast tank is located between the lifting devices, 7. Samenstel volgens een der voorgaande conclusies, waarbij de bewegingsbeperkingsinrichting opneemruimten voor de verticale ankers omvat, waarbij de verticale ankers in de opneemruimten zijn opgenomen wanneer deze door de hij sinrichtingen volledig zijn opgehaald,An assembly according to any one of the preceding claims, wherein the movement-limiting device comprises receiving spaces for the vertical anchors, wherein the vertical anchors are accommodated in the receiving spaces when they have been completely picked up by the lifting devices, 8. Samenstel. volgens een der voorgaande conclusies, waarbij het verticaal anker een ballast met aanzienlijk negatief drij fvermogen is.8. Assembly. according to any one of the preceding claims, wherein the vertical anchor is a ballast with considerable negative buoyancy. 9. Samenstel volgens een der voorgaande conclusies, waarbij het verticaal anker een zuiganker of zuigcaisson is.An assembly according to any one of the preceding claims, wherein the vertical anchor is a suction anchor or suction box. 10. Samenstel volgens conclusies 4 en 7, waarbij de ballasttank zich tussen de opneemruimten voor de verticale ankers bevindt.10. Assembly as claimed in claims 4 and 7, wherein the ballast tank is located between the receiving spaces for the vertical anchors. 11. Samenstel volgens een der voorgaande conclusies, waarbij de bewegingsbeperkingsinrichting een drijfvermogen verschaffende kamer boven het verticale anker omvat.11. Assembly as claimed in any of the foregoing claims, wherein the movement-limiting device comprises a buoyancy-providing chamber above the vertical anchor. 12. Samenstel volgens conclusie 11, waarbij de dri j fvermogen verschaffende kamers zich naast de romp bevinden.The assembly of claim 11, wherein the three power providing chambers are adjacent the hull. 13. Samenstel volgens conclusies 3 en 11, waarbij de drij fvermogen ve r scha f fende kamers zich naast de opneemruimte voor de boeg bevinden,An assembly according to claims 3 and 11, wherein the buoyancy chambers are located next to the receiving space for the bow, 14. Samenstel volgens conclusies 3 en 4, waarbij ae ballasttank zich onder de opneemruimte voor de boeg bevindt.An assembly according to claims 3 and 4, wherein the ballast tank is located under the receiving space for the bow. 15. Werkwijze voor het beperken van de beweging van een drijvende bok in respons op golven, door middel van een bewegingsbeperkings inrichting die is gekoppeld aan de drijvende bok, waarbij de drijvende bok is voorzien van een romp met een boeg en een achtersteven, en een hijskraan met een giek en een hijsvoorziening die is gekoppeld aan de giek, waarbij de onderzijde van de giek bij de boeg zwenkend is gekoppeld aan de romp om de tegengestelde bovenzijde in de richting van de achtersteven naar de boeg en terug te zwenken en niet dwars daarop, waarbij de kraan in een uitstaande zwenkstand van de giek zich met zijn hijsvoorziening voor en buiten de boeg bevindt, waarbij de bewegingsbeperkingsinrichting een separate eenheid of een set van separate eenheden is die afneembaar is gekoppeld aan of te koppelen is aan de romp, waarbij de bewegingsbeperkingsinrichting bij de boeg een verticaal anker aan bakboord en een verticaal anker aan stuurboord en voor elk verticaal anker een hijsinrichting met een hijsketting of hijskabel omvat waaraan de verticale ankers zijn opgehangen, waarbij de hijsinrichtingen zijn ingericht voor het neerlaten van de verticale ankers naar en het ophalen van de verticale ankers van de bodem van het waterlichaam waarin de romp drijft, waarbij de werkwijze omvat net koppelen van de bewegingsbeperkingsinrichting aan de boeg voorafgaand aan een hijsoperatie met de hijsvoorziening, het neerlaten van het verticaal anker aan bakboord en het verticaal anker aan stuurboord op de bodem van het water lichaam en tijdens de hijsoperatie die met de hijsvoorziening wordt uitgevoerd het onder spanning houden van de hijskettingen of hijskabels.A method for restricting the movement of a floating goat in response to waves, by means of a movement limiting device coupled to the floating goat, wherein the floating goat is provided with a hull with a bow and a stern, and a hoisting crane with a boom and hoisting device coupled to the boom, with the underside of the boom at the bow pivotally coupled to the hull to pivot the opposite top in the direction of the stern towards the bow and not back transversely thereto wherein the crane is in an outstanding pivotal position of the boom with its lifting provision in front of and outside the bow, wherein the movement limiting device is a separate unit or a set of separate units which is detachably coupled to or connectable to the hull, the movement limiting device at the bow a vertical anchor on the port side and a vertical anchor on the starboard side and a hoisting device for each vertical anchor g. comprises a hoisting chain or cable on which the vertical anchors are suspended, the hoisting devices being adapted to lower the vertical anchors to and retrieve the vertical anchors from the bottom of the body of water in which the hull floats, the method comprising just coupling the movement limiting device to the bow prior to a lifting operation with the lifting device, lowering the vertical anchor to port and the vertical anchor to starboard on the bottom of the body of water and keeping it under tension during the lifting operation carried out with the lifting device of the hoisting chains or hoisting cables. 16, Werkwijze volgens conclusie 15, waarbij de bewegingsbeperkingsinrichting een ballasttank en een waterpomp om de hoeveelheid water in de ballasttank te veranderen omvat, waarbij de werkwijze omvat het vullen van de ballasttank met een hoeveelheid water na het op de bodem van het waterlichaam neerlaten van het verticaal anker aan bakboord en het verticaal anker aan stuurboord.A method as claimed in claim 15, wherein the movement limiting device comprises a ballast tank and a water pump for changing the amount of water in the ballast tank, the method comprising filling the ballast tank with an amount of water after lowering the bottom of the body of water. vertical anchor on port and the vertical anchor on starboard. 17. Bewegingsbeperkingsinrichting voor het beperken van de beweging van een stationair werkschip, zoals een drij vende bok of kraanschip, in respons op golven, waarbij de bewegingsbeperkingsinrichting een drijflichaam omvat dat een positief drijfvermogen verschaft voor de gehele bewegingsbeperkingsinrichting, een bevestigingsvoorz.ie.ning om de bewegingsbeperkingsinrichting aan de romp van het werkschip te bevestigen, een verticaal anker aan bakboord en een verticaal anker aan stuurboord en voor elk verticaal anker een hij sin.richt.ing met een hijsketting of hijskabel waaraan de verticale ankers zijn opgehangen, waarbij de hijsinrichtingen zijn ingericht voor het neerlaten van de verticale ankers naar en het cphalen van de verticale ankers van de bodem van net waterlichaam waarin de romp of de bewegingsbeperkingsinrichting drijft.A motion-limiting device for restricting the movement of a stationary work vessel, such as a floating goat or crane vessel, in response to waves, the motion-limiting device comprising a floating body providing a positive buoyancy for the entire movement-limiting device, a mounting means for attach the movement limiting device to the hull of the work vessel, a vertical anchor to port and a vertical anchor to starboard and, for each vertical anchor, a lifting device with a hoisting chain or cable on which the vertical anchors are suspended, the hoisting devices being arranged for lowering the vertical anchors to and retrieving the vertical anchors from the bottom of the body of water in which the hull or movement limiting device floats. 18. Bewegingsbeperkingsinrichting volgens conclusie 17, waarbij het verticaal anker een ballast, met aanzienlijk negatief drij fvermogen is.A movement limiting device according to claim 17, wherein the vertical anchor is a ballast, with considerable negative buoyancy. 19. Bewegingsbeperkingsinrichting volgens conclusie 17 of 16, waarbij het verticaal anker een zuiganker of zuigcaisson is.The movement limiting device according to claim 17 or 16, wherein the vertical anchor is a suction anchor or suction box. 20. Bewegingsbeperkingsinrichting volgens een der conclusies 17-19, waarbij de bewegingsbeperkingsinrichting een ballasttank en een waterpomp om de hoeveelheid water in de ballasttank te veranderen omvat.The movement limiting device according to any of claims 17-19, wherein the movement limiting device comprises a ballast tank and a water pump for changing the amount of water in the ballast tank. 21. Bewegingsbeperkingsinrichting volgens een der conclusies 17-21, waarbij de bewegingsbeperkingsinrichting een drijfvermogen verschaffende kamer boven het verticale anker omvat. ... 0... o... 0... 0—o—o—o—o -The motion-limiting device according to any of claims 17-21, wherein the motion-limiting device comprises a buoyancy-providing chamber above the vertical anchor. ... 0 ... o ... 0 ... 0 — o — o — o — o -
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US6257165B1 (en) * 1999-12-20 2001-07-10 Allen Danos, Jr. Vessel with movable deck and method
WO2008077405A1 (en) * 2006-12-22 2008-07-03 Vestas Wind Systems A/S A mooring system for stabilizing a vessel, a vessel, method for stabilizing a vessel and use of a mooring system

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