US20130336724A1 - Device and method for performing an operation on an at least partially submerged structure - Google Patents
Device and method for performing an operation on an at least partially submerged structure Download PDFInfo
- Publication number
- US20130336724A1 US20130336724A1 US13/914,793 US201313914793A US2013336724A1 US 20130336724 A1 US20130336724 A1 US 20130336724A1 US 201313914793 A US201313914793 A US 201313914793A US 2013336724 A1 US2013336724 A1 US 2013336724A1
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- US
- United States
- Prior art keywords
- movable arm
- rail
- buoyancy element
- base
- movable
- 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.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D57/00—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00
- B23D57/0084—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00 specially adapted for sawing under water or at places accessible with difficulty
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/1224—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
- B23K37/0211—Carriages for supporting the welding or cutting element travelling on a guide member, e.g. rail, track
- B23K37/0217—Carriages for supporting the welding or cutting element travelling on a guide member, e.g. rail, track the guide member being fixed to the workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/0061—Underwater arc welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
- B63C11/52—Tools specially adapted for working underwater, not otherwise provided for
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0034—Maintenance, repair or inspection of offshore constructions
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/04—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by cutting-off under water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0052—Removal or dismantling of offshore structures from their offshore location
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/006—Platforms with supporting legs with lattice style supporting legs
Definitions
- a heavy lift vessel is used to support a top part of the jacket. Subsequently, the jacket is cut at a certain distance above the seabed. The section above the cut is lifted and removed with the heavy lift vessel, and the section below the cut remains on location. A further cutting and lifting operation may be required to remove a next part.
- the base comprises a buoyancy element.
- the buoyancy element allows easier transportation and handling as well as accurate positioning of the device relative to the structure.
- the buoyancy element may have a length of more than 10 meter, i.e. 10-150 meters, depending on the size of the structure.
- FIGS. 4A and 4B another embodiment of the device 10 is shown which does not comprise a buoyancy tank 16 .
- the device comprises a set of interconnected parallel rails 22 A, 22 B.
- the rails are interconnected via cross-beams 23 and are positioned at a distance 90 from one another.
- the device 10 further comprises four clamps 20 , but another number of clamps is also possible.
- the clamps 20 are connected to the cross-beams 23 .
- the movable arms 30 including the respective carriage 32 are substantially the same as for the embodiment of FIGS. 1-3 .
- the support carriage 32 comprises two sliding or rolling elements 36 which are engaged with the first rail 22 A at a distance 47 from on another, and at least two sliding or rolling elements 36 engaged with the second rail 22 B at a distance 47 from one another.
- the present invention may also be used for assembling a structure under water.
Abstract
A device (10) for performing an under water operation on an at least partially submerged structure (40) or in the vicinity of the at least partially submerged structure includes a base (15) including at least one coupling (20) for coupling the device to the structure; at least a first articulated movable arm (30) directly or indirectly connected at a proximal end thereof (31) to the base, the first movable arm including a tool (60) connected to a distal end (29) of the first movable arm, where the tool is movable in a three dimensional working range about the base, where the base includes at least one rail (22A, 22B), and where the movable arm (30) includes a support carriage (32) which engages with the rail in order to allow the movable arm to move along the rail.
Description
- This application claims the benefit of Netherlands Application No. 2009005, filed Jun. 14, 2012, and of U.S. Provisional Application No. 61/659,625, filed Jun. 14, 2012, the contents of all of which are incorporated by reference herein.
- The present invention relates to the field of disassembling structures in a marine environment. The present invention further related to performing other operations on structures in a marine environment.
- In the past years, many structures have been built at sea, in particular for exploration and production of hydrocarbons. These structures are generally partially submerged. Often, these structures rest on a seabed and protrude above the water level. Structures at sea have been built for other purposes as well.
- At the end of the economic lifespan, such a structure often needs to be removed or disassembled. This is often a difficult and costly process. Often, divers are used to perform under water operations. This brings along great risks to human life. Moreover, the use of divers at sea is costly and time consuming. Sometimes, ROV's are used. However, ROV's also have certain limitations. ROV's can only exert limited forces. ROV's further are sensitive to currents, just as divers. Sometimes a special-purpose vessel is used to remove such structures. These vessels are very expensive.
- The present invention relates in particular to jacket structures. A jacket comprises many tubulars which are interconnected and form a lattice structure. The beams are generally made from steel. A jacket generally comprises a number of beams which are substantially upstanding and which extend from a base of the jacket to a top of the jacket.
- The upstanding beams are generally connected to one another via horizontal and diagonal cross-beams.
- Once a jacket reaches the end of its economic or technical lifespan, it may need to be removed. The required removal is dependent on local administrative requirements and can be in part or in full.
- In a known method of removing a jacket, a heavy lift vessel is used to support a top part of the jacket. Subsequently, the jacket is cut at a certain distance above the seabed. The section above the cut is lifted and removed with the heavy lift vessel, and the section below the cut remains on location. A further cutting and lifting operation may be required to remove a next part.
- The cutting of the jacket generally is a time consuming and expensive operation. Generally, a large vessel with a crew is required in order to perform the cutting. Divers or one or more ROV' s and special cutting and lifting equipment are required for the actual cutting itself. For the lifting operation, heavy lift capability is required, which is expensive.
- The known removal operation has a further disadvantage in that bad weather can cause significant delays, which further increase the costs. There is a need in the field of the art for more efficient and cost-effective way of removing jacket structures.
- Further, construction or repair of structures at sea is also rather costly. Also during construction, under water operations are necessary. Divers and ROV's are often used, but have the same disadvantages as during the removal or disassembling of a structure. Some apparatuses for underwater work other than ROV's have been conceived, but none of these apparatuses provide the capabilities needed. There is also a need in the art for improved methods of constructing or repairing structures at sea.
- It is an object of the invention to improve operations on structures which are at least partially submerged.
- A device is provided for performing an under water operation on an at least partially submerged structure or in the vicinity of the at least partially submerged structure, the device comprising:
-
- a base comprising at least one coupling for coupling the device to the structure and uncoupling the device from the structure,
- at least a first articulated movable arm directly or indirectly connected at a proximal end thereof to the base, the first movable arm comprising a tool connected to a distal end of said first movable arm, wherein the tool is movable in a three dimensional working range about the base,
wherein the base comprises at least one rail, wherein the movable arm comprises a support carriage which engages with the rail in order to allow the movable arm to move along said rail.
- With the present invention, a large jacket structure can be disassembled. It is possible to disassemble a jacket structure having a height of for instance 100 meter or more. The disassembling operation can be performed substantially independently by the movable arm. The couplings allow coupling and uncoupling of the device to and from the structure in a simple manner. The at least one rail may have a length of more than 10 meter, i.e. 10-150 meters, depending on the size of the structure.
- In an embodiment, the base comprises a buoyancy element. The buoyancy element allows easier transportation and handling as well as accurate positioning of the device relative to the structure. The buoyancy element may have a length of more than 10 meter, i.e. 10-150 meters, depending on the size of the structure.
- In an embodiment, the buoyancy element is elongate and wherein the couplings are connected to the buoyancy element at different positions along the length of the buoyancy tank. In a further embodiment, the buoyancy element is elongate and constructed to be mounted to a leg of the structure in an orientation which is substantially parallel to said leg.
- In an embodiment, the base comprises a first rail and a second rail which extend parallel to one another at a distance from one another, wherein the support carriage is constructed to engage both the first and the second rail. In an embodiment, the at least one rail is mounted to the buoyancy element. When the buoyancy element forms a structural component to which the couplings and the rails are mounted a sturdy structure is obtained which can be coupled to a leg of a structure relatively easy.
- In an embodiment, the buoyancy element has a longitudinal axis, wherein the at least one rail extends parallel to the longitudinal axis of the buoyancy element.
- In an embodiment, the device comprises a plurality of couplings which are mounted to one side of the buoyancy element, wherein the at least one rail is mounted to a different side of the buoyancy element. This configuration allows a substantial freedom of movement for the movable arms.
- In an embodiment, the device comprises at least two movable arms, each comprising a support carriage and each being movably connected to the at least one rail. This configuration allows cooperation between two movable arms. The movable arms may be connected to the same rails. The two movable arms are movable over the rails independently from one another.
- In an embodiment, the device comprises two sets of rails, and wherein at least one movable arm is movably connected to each set of rails. The sets may be located on different sides, in particular opposing sides of the buoyancy element.
- In an embodiment, the movable arm comprises a connection member constructed to be connected to a lifting cable which extends between a surface vessel and the movable arm.
- In an embodiment, the movable arm comprises at least two segments connected to one another by a hinge and wherein the connection member is provided near said hinge.
- The present invention further relates to an assembly comprising:
-
- a device according to any of embodiments 19-22,
- a vessel, and
- an at least partially submerged structure,
wherein the device is connected to the structure, wherein the vessel is connected to the connection member via a lifting cable, wherein the vessel exerts an additional upward force on the movable arm via the lifting cable.
- The present invention further relates to a method of performing an under water operation on an at least partially submerged structure or in the vicinity of the at least partially submerged structure, the method comprising:
-
- providing a device for performing an under water operation on an at least partially submerged structure or in the vicinity of the at least partially submerged structure, the device comprising:
- a base comprising at least one coupling for coupling the device to the structure and uncoupling the device from the structure,
- at least a first articulated movable arm directly or indirectly connected at a proximal end thereof to the base, the first movable arm comprising a tool connected to a distal end of said first movable arm, wherein the tool is movable in a three dimensional working range about the base,
- wherein the base comprises at least one rail, wherein the movable arm comprises a support carriage which engages with the rail in order to allow the movable arm to move along said rail,
- connecting said device to the structure, wherein the base of the device is at least partially submerged,
- performing an operation with the tool mounted on the distal end of the movable arm.
- providing a device for performing an under water operation on an at least partially submerged structure or in the vicinity of the at least partially submerged structure, the device comprising:
- In an embodiment of the method, the device comprises a buoyancy element, and wherein the method comprises:
-
- transporting the device to the structure in a floating condition,
- ballasting the buoyancy element with water, thereby lowering the device,
- connecting the device to the structure via at least two couplings, wherein at least one coupling is located under water.
- In an embodiment of the method, the buoyancy element is elongate and is connected substantially parallel to a leg of the structure.
- In an embodiment of the method, the device comprises at least one rail, wherein the movable arm comprises a support carriage which engages with the rail and is constructed to move along said rail, wherein the movable arm travels along said rail from one position to another position, and performs operations at said positions.
- In an embodiment of the method, the device comprises two or more movable arms which are movably connected to the at least one rail and which simultaneously perform operations on the structure, in particular in cooperation.
- In an embodiment, the method comprises removing several parts of the structure by the movable arm, and leaving a leg to which the device is connected and supporting beams which directly support the leg intact.
- In an embodiment, the method comprises positioning a vessel in the vicinity of to the device and providing one or more connection lines between the device and the vessel for conveying:
-
- control signals,
- electric power, and/or
- hydraulic fluids
from the vessel to the device or vice versa.
- In an embodiment, the method comprises:
-
- positioning a vessel comprising a hoisting device above to the device and providing at least one lifting cable between the hoisting device and a connection member on the movable arm,
- performing an operation with the tool mounted on the distal end of the movable arm, wherein during the operation an additional lifting force F is exerted on the movable arm via the lifting cable by the vessel.
- The previous and other features and advantages of the present invention will be more fully understood from the following detailed description of exemplary embodiments with reference to the attached drawings.
-
FIG. 1A shows a side view of an embodiment of the invention during transport. -
FIG. 1B shows a side view of the embodiment ofFIG. 1A during coupling with the structure. -
FIG. 1C shows a side view of the embodiment ofFIG. 1A in a next step of the coupling with the structure. -
FIG. 2 shows a side view of an embodiment of the invention during operation. -
FIG. 3A shows a cross-section of an embodiment of the invention during operation according to the lines A-A inFIG. 2 . -
FIG. 3B shows a cross-section of an alternative embodiment of the invention during operation according to the lines A-A inFIG. 2 . -
FIG. 4A shows a side view of another embodiment of the invention during operation. -
FIG. 4B shows a schematic front view of the embodiment ofFIG. 4A . -
FIG. 5A shows a top view of a movable arm according to the invention. -
FIG. 5B shows a side view of a movable arm according to the invention. -
FIG. 5C shows a partial view of a movable arm according to the invention comprising another tool. -
FIG. 6 shows a side view of another embodiment of the invention during operation. - With reference to
FIGS. 1A , 1B, 1C, 2 and 3A, adevice 10 according to the invention is shown during its transport to a target location. Thedevice 10 is being towed by anauxiliary vessel 50 via aline 12. Thedevice 10 comprises abuoyancy element 16. Thebuoyancy element 16 forms abase 15 of thedevice 10, i.e. a central structural component of thedevice 10. The buoyancy element is elongate and has a circular cross-section. - The
device 10 is being towed in a substantially upright orientation and is submerged for the greater part, with a small part protruding above thewater line 5. Thedevice 10 may also be towed in a different orientation, for instance substantially horizontal. - The
buoyancy element 16 internally comprises multiple compartments which are located along the length of the buoyancy element. The compartments are separated from one another by bulkheads, as is commonly known in the prior art. The buoyancy element comprisesopenings 18 with controllable valves. The valves allow ballasting of the buoyancy element in a controlled manner in order to submerge the device. At least one pump is provided for blowing compressed air, nitrogen or another gas into the compartments for removing the water when required, thereby raising thedevice 10. When multiple valves are used, in a preferred embodiment, these valves can be operated from a single connection point. It is also possible that thedevice 10 comprises several separate buoyancy elements. -
Clamps 20 are connected to thebuoyancy element 16. The clamps are positioned at a distance from one another. Two clamps 20 may be provided, but more clamps may also be provided. The clamps are configured to be connected to a leg of a structure. To this end, theclamps 20 are hydraulically operated. Theclamps 20 may also be pneumatically or electrically operated. Theclamps 20 are constructed to transfer substantial forces in three dimensions and substantial moments about the X-axis, Y-axis and Z-axis from thedevice 10 to thestructure 40. - In particular when the
device 10 performs a lifting operation, a downward vertical force is exerted by thedevice 10 via thecouplings 20 onto thestructure 40. If a current exists in the water, horizontal forces will also be transferred via theclamps 20 to thestructure 40. - The
device 10 comprises tworails buoyancy element 16. Therails main axis 24 of thebuoyancy element 16. Therails - Two articulated
movable arms 30 are connected to therails movable arm 30 comprises acarriage 32 constructed to move along therails skids 36 which engage the rail and fixate the carriage in two directions transverse to the rail (Y-direction and Z-direction) while allowing a movement parallel to the rail X-direction). - Each movable arm further comprises a
turret 34 which is rotatably mounted to thecarriage 32 and projects from the carriage. Theturret 34 comprises an internal drive which rotates the turret relative to the carriage. The movable arm will discussed further herein below. - The two
movable arms 30 are movable over the rails independently from one another. The twomovable arms 30 including thecarriages 32 are also independently movable from one another relative to thebase 15. - Turning to
FIG. 1B , upon arrival at thestructure 40, thedevice 10 is positioned vertical or substantially parallel to aleg 42 of the structure by thevessel 50. The compartments are controllably flooded to reach the required depth and orientation. From a vertical orientation, the lower clamp is engaged on the structure first. Then the structure is tilted in order to engage the upper clamp as well, seeFIG. 1C . - When the
auxiliary vessel 50 arrives at thestructure 40, thebuoyancy element 16 is ballasted so that it submerges. Optionally the element is ballasted such that it rotates. During the connection operation, thedevice 10 may remain connected to the vessel via one or more lines for more control of the movement. Theclamps 20 engage aleg 42 of thestructure 40 and are hydraulically energized to firmly clamp theleg 42. The device is 10 now rigidly coupled relative to thestructure 40. The device may be completely submerged or may be partially above thewater line 5. - In
FIG. 2 , thedevice 10 is shown in operation. Thedevice 10 is connected to astructure 40 which needs to be dismantled. The structure may be jacket structure of which a top side unit has already been removed in an earlier operation. The structure compriseslegs 42 and cross-beams, diagonal beams and otherinternal beams 44 which interconnect thelegs 42 and provide structural rigidity to the jacket structure. The leg typically extends at an angle to the vertical of less than 10 degrees - The
arms 30 have a three-dimensional operating range relative to thesupport carriage 32. Further, due to the ability to travel along the rail 22, thearms 30 have an operating range which is large enough to cover a substantial portion of thestructure 40. In this way, thearms 40 can disassemble thestructure 40 or at least disassemble a substantial part of thestructure 40. - It is possible that the working range of the
arms 30 is too small to cover the entire height of thestructure 40 or to cover the entire horizontal span of thestructure 40. In that case, thedevice 10 may need to be repositioned from time to time to change the working range and allow the tools of the arms to reach other portions of the structure. The repositioning may involve connecting thedevice 10 to anotherleg 42. - During operation, the
device 10 is connected to theauxiliary vessel 50 vialines 75. Theselines 75 may comprise a power cable for providing electrical power, a hydraulic cable for providing hydraulic power, control lines for controlling the various actuators, pumps and valves. Also lines for relaying signals from sensors may be provided. During operation, the auxiliary vessel stays in the vicinity of thedevice 10. In case of storm, the connection lines 75 may be disconnected and the auxiliary vesse 150 may be moved to a safer area. The lines may be attached to one another to form an umbilical. - Turning to
FIG. 3 , the twoparallel rails support carriage 32 comprises skiddingelements 36 which are connected to the rails. The skiddingelements 36 engage both the front side and the back side of eachrail - A
rack 70 is connected to thebuoyancy element 16 between therails rails support carriage 32 comprises apinion 72 which is connected to adrive 74. The rack and pinion allows the movable arm to travel in a controlled manner along therails support carriage 32 of the movable arm relative to the buoyancy unit are conceivable. For instance, in another embodiment, the carriage comprises rollers instead of skidding elements. One or more of the rollers may be driven by adrive 74. - The
rails buoyancy element 16 than theclamps 20. - The
movable arm 30 is connected at aproximal end 31 to theturret 34 via afirst hinge 35. The movable arm comprises afirst segment 37 and asecond segment 38, which are interconnected via asecond hinge 39. Atool 60 is connected to thesecond segment 38 via athird hinge 62 at adistal end 29 of thearm 30. Thetool 60 itself is rotatable relative to asocket 63 via which thetool 60 is connected to thehinge 62. Thearm 30 is equipped with actuators to allow controlled movement of the arm, which are discussed in more detail below. - The
tool 60 is a cutting tool, and can be a hydraulic cutter, a saw, a flame cutting tool, a welding tool, or a laser device. The tool may also be a gripping tool, drilling tool or a different tool. The tool has a three dimensional working range about thecarriage 32. Thetool 60 is rotatable about three independent axes of rotation relative to thedistal end 29, resulting in six degrees of freedom relative to thecarriage 32. - A control unit is provided on board the auxiliary vessel to control the
device 10. One or more operators may be present to control the device, or thedevice 10 may be fully automated. - In an embodiment, the
device 10 comprising themovable arm 30 comprises several sensors which are used for determining a position of the movable arm and of the processing tool relative to the structure. These sensors may be ultrasonic sensors, video cameras and/or touch sensors which register an engagement of the movable arm with the structure. Other sensors may also be provided, such as a current sensor for measuring the current or a weight sensor for measuring the weight of a part of thestructure 40 which is lifted by thearm 30. - The
clamps 20 comprise twoclamp halves buoyancy element 16 viastruts 26. - Turning to
FIG. 3 b, another embodiment is shown having two sets ofrails buoyancy element 16. Onemovable arm 30 is connected to one pair ofrails movable arm 30 is connected to the other pair ofrails longitudinal axis 24 of the buoyancy tank, and also with respect to amidplane 49 which extends through thelongitudinal axis 24 and thelongitudinal axis 25 of theleg 24. - Further the two movable arms can pass one another when travelling along the length of the
base 15, because they are connected to different rails. - Turning to
FIGS. 4A and 4B , another embodiment of thedevice 10 is shown which does not comprise abuoyancy tank 16. The device comprises a set of interconnectedparallel rails cross-beams 23 and are positioned at adistance 90 from one another. Thedevice 10 further comprises fourclamps 20, but another number of clamps is also possible. Theclamps 20 are connected to the cross-beams 23. Themovable arms 30 including therespective carriage 32 are substantially the same as for the embodiment ofFIGS. 1-3 . - Prior to operation, the
device 10 is transported to thestructure 40 by anauxiliary vessel 50. Thedevice 10 is lowered via lines or cables by a crane or another hoisting device on thevessel 50. Thedevice 10 is positioned parallel to and in engagement with aleg 42 of thestructure 40. Theclamps 20 are hydraulically operated to firmly grip theleg 42. - Turning to
FIGS. 5A and 5B , an embodiment of themovable arm 30 is shown. Themovable arm 30 comprises acarriage 32 which comprises skiddingelements 36. Aturret 34 is mounted to atop side 33 of thecarriage 32. Thefirst segment 37 is connected via thehinge 35 to theturret 34. A drive is provided inside the carriage to rotate the turret relative to thecarriage 32. An actuator 76 in the form of a hydraulic cylinder is provided to rotate the first segment relative to theturret 34. Theactuator 76 extend betweenpivots 79 on respectively theturret 34 and thefirst arm 37 - Another
hinge 39 connects thesecond segment 38 to thefirst segment 37. Anotheractuator 77 is provided to rotate thesecond segment 38 segment relative to the first segment. Theactuator 77 extends between apivot 79 on the first segment and amechanism 81 which comprises multiple axes and beams and which acts as a lever. - The
tool 60 inFIGS. 5A , 5B is rotatably mounted to thesocket 63, which in turn is connected to thethird hinge 62. - A
connection member 82 is provided on the first segment near thefirst hinge 39, the purpose of which is discussed in connection withFIGS. 6 and 7A , 7B, 7C. - The
support carriage 32 comprises two sliding or rollingelements 36 which are engaged with thefirst rail 22A at adistance 47 from on another, and at least two sliding or rollingelements 36 engaged with thesecond rail 22B at adistance 47 from one another. - Turning to
FIG. 5C , a grippingtool 60 is shown. Typically, onearm 30 will have a cutting tool and anotherarm 30 of thedevice 10 will have a gripping tool. In a typical operation, one arm grips a part of the structure which is to be removed with the gripping tool, and theother arm 30 cuts the part loose from the remainder of thestructure 40 with the cuttingtool 60. - Turning to
FIG. 6 another embodiment is shown. Thedevice 10 comprises aconnection point 82 where a liftingcable 84 can be connected to thearm 30. The liftingcable 84 extends between theauxiliary vessel 50 and themovable arm 30. In the figure, theconnection point 82 is provided near thefirst hinge 39 between thefirst segment 37 and thesecond segment 38 but it may be elsewhere as well. - The lifting
cable 84 may be connected to ahoisting device 85 on thevessel 50. The hoisting device comprises awinch 87 and a boom 86 which extends outboard of the vessel. In operation, the liftingcable 84 can provide an additional lifting force F, substantially increasing the lifting capacity of thearm 30. The liftingcable 84 can also be used in the embodiments ofFIGS. 1 , 2, 3, 4, 5A, 5B, 5C. The hoistingdevice 87 is configured to take in cable when thetool 60 needs to be moved upward, and to spool out cable when thetool 60 needs to be moved downward. The hoistingdevice 87 comprises a heave compensation device as is known in the priori art. - In another embodiment, the
connection member 82 is provided on thesecond segment 38, in particular near thethird hinge 62. - It will be obvious to a person skilled in the art that the details and the arrangement of the parts may be varied over considerable range without departing from the scope of the invention as defined by the claims. In particular, the device according to the invention may be used for different operations than a disassembling operation. Maintenance work, cleaning operations, and other operations may also be performed.
- Further, the skilled person will understand that the present invention may also be used for assembling a structure under water.
- The following embodiments or aspects of the invention may be combined in any fashion and combination and be within the scope of the present invention, as follows:
- Embodiment 1. Device (10) for performing an under water operation on an at least partially submerged structure (40) or in the vicinity of the at least partially submerged structure, the device comprising:
- a base (15) comprising at least one coupling (20) for coupling the device to the structure and uncoupling the device from the structure,
- at least a first articulated movable arm (30) directly or indirectly connected at a proximal end thereof (31) to the base, the first movable arm comprising a tool (60) connected to a distal end (29) of said first movable arm, wherein the tool is movable in a three dimensional working range about the base,
- wherein the base comprises at least one rail (22A, 22B), wherein the movable arm (30) comprises a support carriage (32) which engages with the rail in order to allow the movable arm to move along said rail.
- Embodiment 2. Device according to embodiment 1, wherein the base (15) comprises a buoyancy element (16).
- Embodiment 3. Device according to embodiment 2, wherein the buoyancy element is elongate and wherein the couplings (20) are connected to the buoyancy element at different positions along the length of the buoyancy tank.
- Embodiment 4. Device according to any of the previous embodiments, wherein the buoyancy element (16) is elongate and constructed to be mounted to a leg (42) of the structure (40) in an orientation which is substantially parallel to said leg.
-
Embodiment 5. Device according to any of the previous embodiments, wherein the base comprises a first rail (22A) and a second rail (22B) which extend parallel to one another at a distance (90) from one another, wherein the support carriage (32) is constructed to engage both the first and the second rail. - Embodiment 6. Device according to
embodiment 5, wherein the at least one rail (22A, 22B) is mounted to the buoyancy element (16). - Embodiment 7. Device according to any of embodiments 4-6, wherein the buoyancy element has a longitudinal axis (24), wherein the at least one rail (22A, 22B) extends parallel to the longitudinal axis (24) of the buoyancy element.
- Embodiment 8. Device according to any of embodiments 3-7, comprising a plurality of couplings (20) which are mounted to one side of the buoyancy element, wherein the at least one rail (22A, 22B) is mounted to a different side of the buoyancy element.
- Embodiment 9. Device according to any of the previous embodiments, comprising at least two movable arms (30), each comprising a support carriage (32) and each being movably connected to the at least one rail, the at least two movable arms being movable over said rail independently from one another.
-
Embodiment 10. Device according to embodiment 9, comprising two sets of rails, and wherein at least one movable arm (30) is movably connected to each set of rails. - Embodiment 11. Device according to any of the previous embodiments, wherein at least one movable arm comprises a connection member (82) constructed to be connected to a lifting cable (84) which extends between a surface vessel (50) and the movable arm.
-
Embodiment 12. Device according to embodiment 11, wherein the movable arm comprises at least two segments (37, 38) connected to one another by a hinge (39) and wherein the connection member (82) is provided near said hinge. - Embodiment 13. Assembly comprising:
- a device according to any of embodiments 1-12,
- a vessel (50), and
- an at least partially submerged structure (40),
- wherein the device is connected to the structure (40), wherein the vessel is connected to the connection member (82) via a lifting cable (84), wherein the vessel exerts an upward force on the movable arm via the lifting cable.
- Embodiment 14. Method of performing an under water operation on an at least partially submerged structure (40) or in the vicinity of the at least partially submerged structure, the method comprising:
-
- providing a device (10) for performing an under water operation on an at least partially submerged structure (40) or in the vicinity of the at least partially submerged structure, the device comprising:
- a base (15) comprising at least one coupling (20) for coupling the device to the structure and uncoupling the device from the structure,
- at least a first articulated movable arm (30) directly or indirectly connected at a proximal end thereof (31) to the base, the first movable arm comprising a tool (60) connected to a distal end (29) of said first movable arm, wherein the tool is movable in a three dimensional working range about the base,
- wherein the base comprises at least one rail (22A, 22B), wherein the movable arm (30) comprises a support carriage (32) which engages with the rail in order to allow the movable arm to move along said rail,
- connecting said device to the structure, wherein the base of the device is at least partially submerged,
- performing an operation with the tool mounted on the distal end of the movable arm.
- providing a device (10) for performing an under water operation on an at least partially submerged structure (40) or in the vicinity of the at least partially submerged structure, the device comprising:
-
Embodiment 15. Method of embodiment 14, wherein the device comprises a buoyancy element (16), and wherein the method comprises:- transporting the device (10) to the structure in a floating condition,
- ballasting the buoyancy element (16) with water, thereby lowering the device,
- connecting the device to the structure via at least two couplings (20), wherein at least one coupling (20) is located under water.
-
Embodiment 16. Method of any ofembodiments 14 or 15, wherein the buoyancy element is elongate and is connected substantially parallel to a leg (42) of the structure. - Embodiment 17. Method of any of embodiments 14-16, wherein the device comprises at least one rail (40), wherein the movable arm comprises a support carriage (32) which engages with the rail and is constructed to move along said rail, wherein the movable arm travels along said rail from one position to another position, and performs operations at said positions.
-
Embodiment 18. Method of any of embodiments 14-17, wherein the device comprises two or more movable arms (30) which are movably connected to the at least one rail and which simultaneously perform operations on the structure, in particular in cooperation. - Embodiment 19. Method of any of embodiments 14-18, comprising removing several parts of the structure by the movable arm, and leaving a leg (42) to which the device is connected and supporting beams which directly support the leg (42) intact.
-
Embodiment 20. Method of any of embodiments 14-19, comprising positioning a vessel (50) in the vicinity of to the device and providing one or more connection lines (75) between the device and the vessel for conveying:- control signals,
- electric power, and/or
- hydraulic fluids
- from the vessel to the device or vice versa.
- Embodiment 21. Method of any of embodiments 14-20, comprising:
- positioning a vessel comprising a hoisting device (87) above to the device (10) and providing at least one lifting cable (84) between the hoisting device and a connection member (82) on the movable arm,
- performing an operation with the tool (60) mounted on the distal end of the movable arm, wherein during the operation an additional lifting force (F) is exerted on the movable arm via the lifting cable by the vessel.
Claims (21)
1. A device for performing an under water operation on an at least partially submerged structure or in the vicinity of the at least partially submerged structure, the device comprising:
a base comprising at least one coupling for coupling the device to the structure and uncoupling the device from the structure; and
at least a first articulated movable arm directly or indirectly connected at a proximal end thereof to the base, the first movable arm comprising a tool connected to a distal end of said first movable arm, wherein the tool is movable in a three dimensional working range about the base;
wherein the base comprises at least one rail; and
wherein the movable arm comprises a support carriage which engages with the rail in order to allow the movable arm to move along said rail.
2. The device according to claim 1 , wherein the base comprises a buoyancy element.
3. The device according to claim 2 , wherein the buoyancy element is elongate and wherein the couplings are connected to the buoyancy element at different positions along the length of the buoyancy tank.
4. The device according to claim 1 , wherein the buoyancy element is elongate and constructed to be mounted to a leg of the structure in an orientation which is substantially parallel to said leg.
5. The device according to claim 1 , wherein the base comprises a first rail and a second rail which extend parallel to one another at a distance from one another, wherein the support carriage is constructed to engage both the first and the second rail.
6. The device according to claim 5 , wherein the at least one rail is mounted to the buoyancy element.
7. The device according to claim 4 , wherein the buoyancy element has a longitudinal axis, wherein the at least one rail extends parallel to the longitudinal axis of the buoyancy element.
8. The device according to claim 3 , comprising a plurality of couplings which are mounted to one side of the buoyancy element, wherein the at least one rail is mounted to a different side of the buoyancy element.
9. The device according to claim 1 , comprising at least two movable arms, each comprising a support carriage and each being movably connected to the at least one rail, the at least two movable arms being movable over said rail independently from one another.
10. The device according to claim 9 , comprising two sets of rails, and wherein at least one movable arm is movably connected to each set of rails.
11. The device according to claim 1 , wherein at least one movable arm comprises a connection member constructed to be connected to a lifting cable which extends between a surface vessel and the movable arm.
12. The device according to claim 11 , wherein the movable arm comprises at least two segments connected to one another by a hinge and wherein the connection member is provided near said hinge.
13. An assembly comprising:
a device according to claim 1 ;
a vessel; and
an at least partially submerged structure;
wherein the device is connected to the structure, wherein the vessel is connected to the connection member via a lifting cable, wherein the vessel exerts an upward force on the movable arm via the lifting cable.
14. A method of performing an under water operation on an at least partially submerged structure or in the vicinity of the at least partially submerged structure, the method comprising:
providing a device for performing an under water operation on an at least partially submerged structure or in the vicinity of the at least partially submerged structure, the device comprising:
a base comprising at least one coupling for coupling the device to the structure and uncoupling the device from the structure; and
at least a first articulated movable arm directly or indirectly connected at a proximal end thereof to the base, the first movable arm comprising a tool connected to a distal end of said first movable arm, wherein the tool is movable in a three dimensional working range about the base;
wherein the base comprises at least one rail, wherein the movable arm comprises a support carriage which engages with the rail in order to allow the movable arm to move along said rail;
connecting said device to the structure, wherein the base of the device is at least partially submerged; and
performing an operation with the tool mounted on the distal end of the movable arm.
15. The method of claim 14 , wherein the device comprises a buoyancy element, and wherein the method further comprises:
transporting the device to the structure in a floating condition;
ballasting the buoyancy element with water, thereby lowering the device; and
connecting the device to the structure via at least two couplings;
wherein at least one coupling is located under water.
16. The method of claim 14 , wherein the buoyancy element is elongate and is connected substantially parallel to a leg of the structure.
17. The method of claim 14 , wherein the device comprises at least one rail, wherein the movable arm comprises a support carriage which engages with the rail and is constructed to move along said rail, wherein the movable arm travels along said rail from one position to another position, and performs operations at said positions.
18. The method of claim 14 , wherein the device comprises two or more movable arms which are movably connected to the at least one rail and which simultaneously perform operations on the structure, in particular in cooperation.
19. The method of claim 14 , further comprising:
removing several parts of the structure by the movable arm, and leaving a leg to which the device is connected and supporting beams which directly support the leg intact.
20. The method of claim 14 , further comprising:
positioning a vessel in the vicinity of to the device and providing one or more connection lines between the device and the vessel for conveying: control signals, electric power, and/or hydraulic fluids from the vessel to the device or vice versa.
21. The method of claim 14 , further comprising:
positioning a vessel comprising a hoisting device above to the device and providing at least one lifting cable between the hoisting device and a connection member on the movable arm; and
performing an operation with the tool mounted on the distal end of the movable arm, wherein during the operation an additional lifting force (F) is exerted on the movable arm via the lifting cable by the vessel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/914,793 US20130336724A1 (en) | 2012-06-14 | 2013-06-11 | Device and method for performing an operation on an at least partially submerged structure |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261659625P | 2012-06-14 | 2012-06-14 | |
NL2009005 | 2012-06-14 | ||
NL2009005A NL2009005C2 (en) | 2012-06-14 | 2012-06-14 | Device and method for performing an operation on an at least partially submerged structure. |
US13/914,793 US20130336724A1 (en) | 2012-06-14 | 2013-06-11 | Device and method for performing an operation on an at least partially submerged structure |
Publications (1)
Publication Number | Publication Date |
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US20130336724A1 true US20130336724A1 (en) | 2013-12-19 |
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Family Applications (1)
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US13/914,793 Abandoned US20130336724A1 (en) | 2012-06-14 | 2013-06-11 | Device and method for performing an operation on an at least partially submerged structure |
Country Status (4)
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US (1) | US20130336724A1 (en) |
GB (1) | GB2504605A (en) |
NL (1) | NL2009005C2 (en) |
NO (1) | NO20130829A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016133402A1 (en) * | 2015-02-18 | 2016-08-25 | Prezioso Linjebygg As | Module-based vertical access tool for offshore installations |
WO2019169173A1 (en) * | 2018-02-28 | 2019-09-06 | Oceaneereing International, Inc. | Subsea inspection vehicle |
NO20210357A1 (en) * | 2021-03-19 | 2022-09-20 | Oceantech Innovation As | Module-based splash-zone intervention tool assembly. |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2556591B (en) | 2015-09-25 | 2018-09-19 | Subsea 7 Ltd | Moving tools on offshore structures with a walking carriage |
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- 2013-06-13 NO NO20130829A patent/NO20130829A1/en not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
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GB201310366D0 (en) | 2013-07-24 |
NO20130829A1 (en) | 2013-12-16 |
NL2009005C2 (en) | 2013-12-17 |
GB2504605A (en) | 2014-02-05 |
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Legal Events
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Owner name: HEEREMA MARINE CONTRACTORS NEDERLAND SE, NETHERLAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HEEREMA MARINE CONTRACTORS NEDERLAND B.V.;REEL/FRAME:030901/0675 Effective date: 20130716 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |