WO2004111354A1 - Device and method for dislodging and recovering dredging material - Google Patents

Device and method for dislodging and recovering dredging material Download PDF

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Publication number
WO2004111354A1
WO2004111354A1 PCT/BE2004/000085 BE2004000085W WO2004111354A1 WO 2004111354 A1 WO2004111354 A1 WO 2004111354A1 BE 2004000085 W BE2004000085 W BE 2004000085W WO 2004111354 A1 WO2004111354 A1 WO 2004111354A1
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WO
WIPO (PCT)
Prior art keywords
cutter head
cover
dredging
cut
dredging material
Prior art date
Application number
PCT/BE2004/000085
Other languages
French (fr)
Inventor
Stefaan George Charles Vandycke
Original Assignee
Baggerwerken Decloedt En Zoon N.V.
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 Baggerwerken Decloedt En Zoon N.V. filed Critical Baggerwerken Decloedt En Zoon N.V.
Priority to EP04737669A priority Critical patent/EP1639207B1/en
Publication of WO2004111354A1 publication Critical patent/WO2004111354A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel

Definitions

  • the invention relates to a device for dislodging and recovering dredging material, comprising a drive shaft for rotatingly driving a cutter head, and a suction pipe arranged close to the cutter head, wherein the cutter head is partially enclosed by at least one hood-like cover, which cover is adapted to at least partially prevent mixing of the dislodged dredging material with the surrounding fluid.
  • the invention also relates to a method for dislodging and recovering dredging material, wherein material is cut away by means of a cutter head, and the cut-away dredging material is then sucked in, and during the loosening the cut-away dredging material is at least partially screened from the surrounding fluid in order to limit mixing therewith.
  • Such a device is for instance known from EP 0 557 619.
  • This document describes a cutter assembly provided with a cover 29 situated at some distance from the knives. This achieves that the dislodged sludge is fed almost directly to an enclosed space.
  • the invention has for its object to provide a device and method as according to the preamble with which the mixing of the dredging material with the surrounding fluid can be controlled and in particular limited, whereby the churning-up of material in the vicinity of the cutter head can be limited, and wherein the cover can be placed in a suitable position.
  • the device of the invention is distinguished for this purpose in that the at least one hood-like cover comprises an inner and an outer cover, which inner and outer cover are rotatably mounted and located at a mutual distance in radial direction. In this manner a layer of dredging material can be removed with hardly any mixing with the surrounding fluid.
  • the volume of contaminated dredging sludge is greatly reduced in this manner, whereby the special dumping sites for such sludge can be used more efficiently.
  • the outer cover can be partially or wholly rotated under the inner cover when a relatively small part of the outer surface of the cutter head must be covered, so that the inner and outer cover partially or wholly overlap each other.
  • hood-like covers More than two hood-like covers can of course also be used in similar manner.
  • each hood-like cover is rotatably mounted and provided with adjusting means for fixing the cover in different positions relative to the suction pipe .
  • a suitable position will for instance be that where the covers cover that part of the cutter head surrounded by fluid, i.e. substantially cover the side of the cutter head remote from the direction of movement .
  • the inner and outer cover each enclose about a third of the outer surface of the cutter head.
  • the size of the cover will depend among other things on the minimum height of the layer it is wished to dredge. If it must be possible to dredge very thin layers, the inner and outer cover must be able to cover almost the whole outer surface of the cutter head in their maximum covering position (i.e. with a minimum overlap of inner and outer cover) .
  • At least one cover is preferably provided on the outside with strengthening elements, such as for instance ribs extending in the axial direction, or helically running ribs. These provide the cover with an additional resistance to damage in the case of obstacles in the vicinity of the cutter head. Many other embodiments of the strengthening elements can of course be envisaged within the scope of the invention.
  • Drive means can be provided for each cover for the purpose of adjusting the position of the cover relative to the suction pipe. These drive means can then be operated from for instance the control cabin of a dredging vessel to place the covers in the desired position.
  • Control of the cover can preferably take place automatically so as to maximize the efficiency of the system.
  • the invention also relates to a method for dislodging and recovering dredging material using a dredging vessel having a swing arm which is pivotable in a horizontal plane and on which a device according to any of the above described embodiments is mounted, wherein material is cut loose by- means of the cutter head, and the cut-away dredging material is then sucked in, and during the loosening the cut-away dredging material is at least partially screened from the surrounding fluid in order to limit mixing therewith.
  • the cutter head is covered over substantially the part enclosing the cutter head where fluid is present. This therefore means that the cutter head is wholly covered except at the position where the material for dredging is being cut.
  • the cut-away material is sucked in at a flow rate which is controlled as a function of the volume being cut.
  • the volume being cut is preferably determined on the basis of the layer thickness, the step length S and the translation speed at which the cutter head is moved laterally in the direction of the dredging material for recovering.
  • the invention also relates to a dredging vessel provided with a device according to the invention.
  • figure 1 shows a perspective view of a dredging vessel with a cutter suction dredger according to the invention
  • figure 2 shows an axial section of the head of a cutter suction dredger provided with a device according to the invention
  • figure 3A is a front view of the head of figure 2A in a first dredging position
  • figure 3B is a front view of the head of figure 2A in a second dredging position
  • figure 3C is a front view of the head of figure 2A in a dragging position
  • figure 4 is a top view of the dredging vessel of figure 1 illustrating the swinging movement of the cutter suction dredger.
  • FIG. 1 shows an embodiment of a dredging vessel with cutter suction dredger.
  • the shown vessel comprises inter alia a ladder 1, two stud poles 3, 4, a support base 17 connected to ladder 1 and a swing arm 2 mounted rotatably on the base.
  • a cutter head 5 On the outer end of swing arm 2 is arranged a cutter head 5, and close to the cutter head are provided suction means comprising a suction pipe 13 and a ladder pump 8.
  • the vessel is further provided with a control cabin 7 and a second pump 14 for further pumping of the dredging material to a storage location (not shown) .
  • system with ladder, support base and movable swing arm can be replaced by a system with ladder and side winches.
  • only one stud pole is used during dislodging of the bed material.
  • the second stud pole is used when the first stud pole has to be displaced.
  • FIG. 2 shows an axial section of the head of the cutter suction dredger.
  • Cutter head 5 is mounted on drive shaft 11 by means of a hub 9. Along drive shaft 11 is provided a suction pipe 13 for sucking in the material dislodged by cutter head 5. This material is carried away through suction pipe 13 via the suction line.
  • Cutter head 5 is enclosed by a hood-like inner cover 15 and outer cover 16. These are both mounted rotatably and adjustable in different positions, as will be better understood with reference to figures 3A-C.
  • Figure 3B shows the situation in which a layer L is being sucked up over a rather small height H while the cutter suction dredger moves in the direction of arrow Pl.
  • outer cover 16 overlaps with inner cover 15, this such that the outer cover extends substantially as far as the upper side of the layer L for dredging.
  • FIG. 3C shows the situation where a reasonably thick layer (height H) is being dredged in the direction of arrow Pl.
  • the outer cover is now rotated substantially wholly over the inner cover and wholly screens the cutter head from the fluid surrounding the cutter head.
  • figure 3A shows the inner and outer cover around the cutter head when this latter must be displaced without performing a dredging operation. Note that in this position, in which the inner and outer cover are situated in the maximum covering position, the whole unit supports on the cutter head and not on the cover. The stronger cutter head will hereby first come into contact with possible obstacles lying on the bottom, and the risk of damage to the covers is reduced.
  • Figure 4 illustrates the movement of the cutter suction dredger during dredging.
  • the cutter head describes a path B on a sector of a circle. When the cutter head reaches an end of this path, it is moved forward via stud poles 3, 4. Before commencing a following path, the position of the inner and outer cover is changed via drive means, wherein the new position is generally roughly the mirror image of the old position, in order to remove a new layer of dredging material in the opposite direction-.
  • the pump flow rate is regulated as a function of the volume being cut which is determined on the basis of the translation speed of cutter head 5, layer thickness H and step length S of the cutter suction dredger.
  • the flow rate is regulated in proportion to this volume such that the flow rate is zero at the moment the end of path B is reached.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

Device for dislodging and recovering dredging material, comprising a drive shaft (11) for rotatingly driving a cutter head (5), and a suction pipe (13) arranged close to the cutter head, wherein the cutter head is partially enclosed by at least one hood-like cover (15, 16), which cover is adapted to at least partially prevent mixing of the dislodged dredging material with the surrounding fluid.

Description

DEVICE AND METHOD FOR DISLODGING AND RECOVERING DREDGING MATERIAL
The invention relates to a device for dislodging and recovering dredging material, comprising a drive shaft for rotatingly driving a cutter head, and a suction pipe arranged close to the cutter head, wherein the cutter head is partially enclosed by at least one hood-like cover, which cover is adapted to at least partially prevent mixing of the dislodged dredging material with the surrounding fluid. The invention also relates to a method for dislodging and recovering dredging material, wherein material is cut away by means of a cutter head, and the cut-away dredging material is then sucked in, and during the loosening the cut-away dredging material is at least partially screened from the surrounding fluid in order to limit mixing therewith.
Such a device is for instance known from EP 0 557 619. This document describes a cutter assembly provided with a cover 29 situated at some distance from the knives. This achieves that the dislodged sludge is fed almost directly to an enclosed space.
In a conventional cutter suction dredger the cut-away dredging material will be mixed with the surrounding water, and this mixture is subsequently sucked up. Rotation of the cutter head will also create a considerable churning in the immediate vicinity of the cutter head. In particular cases, for instance when the dredging material for recovering is contaminated, it is desirable for this contaminated material to be mixed as little as possible with the surrounding water, on the one hand so as to limit the environmental pollution resulting from the spread of churned-up material and on the other to also minimize the total volume of dredging sludge by- limiting the quantity of added water. The invention has for its object to provide a device and method as according to the preamble with which the mixing of the dredging material with the surrounding fluid can be controlled and in particular limited, whereby the churning-up of material in the vicinity of the cutter head can be limited, and wherein the cover can be placed in a suitable position.
The device of the invention is distinguished for this purpose in that the at least one hood-like cover comprises an inner and an outer cover, which inner and outer cover are rotatably mounted and located at a mutual distance in radial direction. In this manner a layer of dredging material can be removed with hardly any mixing with the surrounding fluid.
Particularly in the case of contaminated material, the volume of contaminated dredging sludge is greatly reduced in this manner, whereby the special dumping sites for such sludge can be used more efficiently. In this way it will also be possible to greatly reduce the churning-up of material created by the rotating cutter head, whereby spread of material into the proximity is minimized.
Owing to the presence of an inner and outer cover, the outer cover can be partially or wholly rotated under the inner cover when a relatively small part of the outer surface of the cutter head must be covered, so that the inner and outer cover partially or wholly overlap each other.
More than two hood-like covers can of course also be used in similar manner.
According to a first embodiment of the invention, each hood-like cover is rotatably mounted and provided with adjusting means for fixing the cover in different positions relative to the suction pipe .
In this manner it is possible, depending on the direction in which dredging is taking place, i.e. the direction of movement of the cutter suction dredger, to place the or each hood-like cover in a suitable position in order to limit as far as possible entry of the surrounding water into the cutter head. A suitable position will for instance be that where the covers cover that part of the cutter head surrounded by fluid, i.e. substantially cover the side of the cutter head remote from the direction of movement .
In a possible variant the inner and outer cover each enclose about a third of the outer surface of the cutter head.
The size of the cover will depend among other things on the minimum height of the layer it is wished to dredge. If it must be possible to dredge very thin layers, the inner and outer cover must be able to cover almost the whole outer surface of the cutter head in their maximum covering position (i.e. with a minimum overlap of inner and outer cover) .
At least one cover is preferably provided on the outside with strengthening elements, such as for instance ribs extending in the axial direction, or helically running ribs. These provide the cover with an additional resistance to damage in the case of obstacles in the vicinity of the cutter head. Many other embodiments of the strengthening elements can of course be envisaged within the scope of the invention.
Drive means can be provided for each cover for the purpose of adjusting the position of the cover relative to the suction pipe. These drive means can then be operated from for instance the control cabin of a dredging vessel to place the covers in the desired position.
Control of the cover can preferably take place automatically so as to maximize the efficiency of the system.
The invention also relates to a method for dislodging and recovering dredging material using a dredging vessel having a swing arm which is pivotable in a horizontal plane and on which a device according to any of the above described embodiments is mounted, wherein material is cut loose by- means of the cutter head, and the cut-away dredging material is then sucked in, and during the loosening the cut-away dredging material is at least partially screened from the surrounding fluid in order to limit mixing therewith.
In this manner the mixing of the cut-away material with the surrounding fluid will be limited. Furthermore, the churning caused by the rotating cutter head is in this way also limited, whereby dredging can take place in a more environmentally-friendly manner.
According to a preferred embodiment of the method according to the invention, the cutter head is covered over substantially the part enclosing the cutter head where fluid is present. This therefore means that the cutter head is wholly covered except at the position where the material for dredging is being cut.
According to a further developed embodiment of the method according to the invention, the cut-away material is sucked in at a flow rate which is controlled as a function of the volume being cut. When the cutter head adjoins a layer of dredging material with a thickness H over a step length S, the volume being cut is preferably determined on the basis of the layer thickness, the step length S and the translation speed at which the cutter head is moved laterally in the direction of the dredging material for recovering.
In this way it is possible to prevent water being sucked up at the moment the cutter head is no longer moving and no new dredging material is therefore available for drawing in. Particularly at the end of a dredged layer, when the cutter head must be moved in the opposite direction, such a control allows the position of the cover to be changed without dredging material being drawn in. Finally, the invention also relates to a dredging vessel provided with a device according to the invention.
The invention will be further elucidated on the basis of the annexed drawing and the figure description hereinbelow, in which among others an exemplary embodiment of a cutter suction dredger according to the invention will be illustrated. In the drawing: figure 1 shows a perspective view of a dredging vessel with a cutter suction dredger according to the invention; figure 2 shows an axial section of the head of a cutter suction dredger provided with a device according to the invention; figure 3A is a front view of the head of figure 2A in a first dredging position; figure 3B is a front view of the head of figure 2A in a second dredging position; figure 3C is a front view of the head of figure 2A in a dragging position; figure 4 is a top view of the dredging vessel of figure 1 illustrating the swinging movement of the cutter suction dredger.
Figure 1 shows an embodiment of a dredging vessel with cutter suction dredger. The shown vessel comprises inter alia a ladder 1, two stud poles 3, 4, a support base 17 connected to ladder 1 and a swing arm 2 mounted rotatably on the base. On the outer end of swing arm 2 is arranged a cutter head 5, and close to the cutter head are provided suction means comprising a suction pipe 13 and a ladder pump 8.
The vessel is further provided with a control cabin 7 and a second pump 14 for further pumping of the dredging material to a storage location (not shown) .
During use of swing arm 2 the pontoon remains stationary and only swing arm 2 moves. During the steps the support base 17 at the bottom of ladder 1 is raised and the pontoon moves forward on the two poles 3, 4.
Note that the system with ladder, support base and movable swing arm can be replaced by a system with ladder and side winches. In the case of operation with side winches, only one stud pole is used during dislodging of the bed material. The second stud pole is used when the first stud pole has to be displaced.
Figure 2 shows an axial section of the head of the cutter suction dredger. Cutter head 5 is mounted on drive shaft 11 by means of a hub 9. Along drive shaft 11 is provided a suction pipe 13 for sucking in the material dislodged by cutter head 5. This material is carried away through suction pipe 13 via the suction line. Cutter head 5 is enclosed by a hood-like inner cover 15 and outer cover 16. These are both mounted rotatably and adjustable in different positions, as will be better understood with reference to figures 3A-C.
Figure 3B shows the situation in which a layer L is being sucked up over a rather small height H while the cutter suction dredger moves in the direction of arrow Pl. In this case only a small part of outer cover 16 overlaps with inner cover 15, this such that the outer cover extends substantially as far as the upper side of the layer L for dredging.
Figure 3C shows the situation where a reasonably thick layer (height H) is being dredged in the direction of arrow Pl. The outer cover is now rotated substantially wholly over the inner cover and wholly screens the cutter head from the fluid surrounding the cutter head.
Finally, figure 3A shows the inner and outer cover around the cutter head when this latter must be displaced without performing a dredging operation. Note that in this position, in which the inner and outer cover are situated in the maximum covering position, the whole unit supports on the cutter head and not on the cover. The stronger cutter head will hereby first come into contact with possible obstacles lying on the bottom, and the risk of damage to the covers is reduced.
Figure 4 illustrates the movement of the cutter suction dredger during dredging. The cutter head describes a path B on a sector of a circle. When the cutter head reaches an end of this path, it is moved forward via stud poles 3, 4. Before commencing a following path, the position of the inner and outer cover is changed via drive means, wherein the new position is generally roughly the mirror image of the old position, in order to remove a new layer of dredging material in the opposite direction-.
During this reversal there is temporarily no new material being cut loose and, in order to avoid water being sucked up at this moment, the pump flow rate must be reduced. According to an embodiment of the method of the invention, the pump flow rate is regulated as a function of the volume being cut which is determined on the basis of the translation speed of cutter head 5, layer thickness H and step length S of the cutter suction dredger. In particular the flow rate is regulated in proportion to this volume such that the flow rate is zero at the moment the end of path B is reached.
The scope of protection of the invention is not limited to the above described preferred embodiments, but is defined on the contrary by the following claims .

Claims

1. Device for dislodging and recovering dredging material, comprising a drive shaft for rotatingly driving a cutter head, and a suction pipe arranged close to the cutter head, wherein the cutter head is partially enclosed by at least one hood-like cover, which cover is adapted to at least partially prevent mixing of the dislodged dredging material with the surrounding fluid, characterized in that the at least one hood-like cover comprises an inner and an outer cover, which inner and outer cover are rotatably mounted and located at a mutual distance in radial direction.
2. Device as claimed in claim 1, characterized in that the or each hood-like cover is rotatably mounted and provided with adjusting means for fixing the cover in different positions relative to the suction pipe.
3. Device as claimed in claim 1 or 2, characterized in that the inner and outer cover each enclose about a third of the outer surface of the cutter head.
4. Device as claimed in any of the foregoing claims, characterized in that at least one of the one or more covers is provided on the outside with strengthening elements.
5. Device as claimed in any of the foregoing claims, characterized in that drive means are provided for each cover for the purpose of adjusting the position of the cover relative to the suction pipe.
6. Method for dislodging and recovering dredging material using a dredging vessel having a swing arm which is pivotable in a horizontal plane and on which a device as claimed in any of the foregoing claims 1-5 is mounted, wherein material is cut away by means of the cutter head, and the cut-away dredging material is then sucked in, and during the loosening the cut-away dredging material is at least partially screened from the surrounding fluid in order to limit mixing therewith.
7. Method as claimed in claim 6, characterized in that the cutter head is covered over substantially the part enclosing the cutter head where fluid is present.
8. Method for dislodging and recovering dredging material, wherein material is cut loose by means of the cutter head, and the cut-away dredging material is then sucked in, wherein during the loosening the cut-away dredging material is at least partially screened from the surrounding fluid in order to limit mixing therewith, characterized in that the cut-away material is sucked in at a flow rate controlled as a function of the volume of the dredging material being cut by the cutter head.
9. Method as claimed in claim 8 , wherein the cutter head adjoins a layer of dredging material with a thickness H over a step length S, characterized in that the volume being cut is determined on the basis of the translation speed at which the cutter head is moved laterally in the direction of the dredging material for recovering, the layer thickness (H) and the step length (S) .
10. Dredging vessel provided with a device as claimed in any of the claims 1-5.
11. Device for dislodging and recovering dredging material, comprising a drive shaft for rotatingly driving a cutter head, and a suction pipe arranged close to the cutter head, wherein the cutter head is partially enclosed by at least one hood-like cover, which cover is adapted to at least partially prevent mixing of the dislodged dredging material with the surrounding fluid.
PCT/BE2004/000085 2003-06-12 2004-06-10 Device and method for dislodging and recovering dredging material WO2004111354A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04737669A EP1639207B1 (en) 2003-06-12 2004-06-10 Device and method for dislodging and recovering dredging material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2003/0356 2003-06-12
BE2003/0356A BE1015566A5 (en) 2003-06-12 2003-06-12 DEVICE AND METHOD FOR CUTTING OUT AND recovering dredging material.

Publications (1)

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WO2004111354A1 true WO2004111354A1 (en) 2004-12-23

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PCT/BE2004/000085 WO2004111354A1 (en) 2003-06-12 2004-06-10 Device and method for dislodging and recovering dredging material

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BE (1) BE1015566A5 (en)
WO (1) WO2004111354A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008062219A1 (en) 2006-11-24 2008-05-29 Ray Drabble Seabed organic material relocating apparatus
WO2010079193A1 (en) * 2009-01-10 2010-07-15 Dredging International N.V. Excavating device for excavating ground under water, and method for excavating ground

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Publication number Priority date Publication date Assignee Title
US962120A (en) * 1908-10-03 1910-06-21 William H Bradley Peat-preparing apparatus.
GB1383089A (en) * 1972-08-15 1975-02-05 Hollandsche Aaneming Mij Nv Suction dredger
US4083134A (en) * 1975-11-10 1978-04-11 Anglo Dutch Dredging Co. Ltd. Suction head for dredgers
NL7812140A (en) * 1978-12-13 1980-06-17 Reba Bv Trailing dredger suction head - has suction pipe extending into space inside knives in ring
JPS58168731A (en) * 1982-03-29 1983-10-05 Penta Ocean Constr Co Ltd Dredger
JPS61261533A (en) * 1985-05-13 1986-11-19 Penta Ocean Constr Co Ltd Backwardly workable dredger
DE3710283A1 (en) * 1987-03-28 1988-10-06 Zueblin Ag Apparatus for extracting and removing contaminated earth
EP0557619A1 (en) * 1992-02-28 1993-09-01 Ihc Holland N.V. Cutter assembly such as for mounting to the ladder of a suction dredger
US6318005B1 (en) * 2000-06-16 2001-11-20 Ellicott Machine Corporation International Dredge with improved auger shroud

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US962120A (en) * 1908-10-03 1910-06-21 William H Bradley Peat-preparing apparatus.
GB1383089A (en) * 1972-08-15 1975-02-05 Hollandsche Aaneming Mij Nv Suction dredger
US4083134A (en) * 1975-11-10 1978-04-11 Anglo Dutch Dredging Co. Ltd. Suction head for dredgers
NL7812140A (en) * 1978-12-13 1980-06-17 Reba Bv Trailing dredger suction head - has suction pipe extending into space inside knives in ring
JPS58168731A (en) * 1982-03-29 1983-10-05 Penta Ocean Constr Co Ltd Dredger
JPS61261533A (en) * 1985-05-13 1986-11-19 Penta Ocean Constr Co Ltd Backwardly workable dredger
DE3710283A1 (en) * 1987-03-28 1988-10-06 Zueblin Ag Apparatus for extracting and removing contaminated earth
EP0557619A1 (en) * 1992-02-28 1993-09-01 Ihc Holland N.V. Cutter assembly such as for mounting to the ladder of a suction dredger
US6318005B1 (en) * 2000-06-16 2001-11-20 Ellicott Machine Corporation International Dredge with improved auger shroud

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Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 005 (M - 267) 11 January 1984 (1984-01-11) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 120 (M - 580) 15 April 1987 (1987-04-15) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008062219A1 (en) 2006-11-24 2008-05-29 Ray Drabble Seabed organic material relocating apparatus
WO2010079193A1 (en) * 2009-01-10 2010-07-15 Dredging International N.V. Excavating device for excavating ground under water, and method for excavating ground
BE1018582A3 (en) * 2009-01-10 2011-04-05 Dredging Int EXCAVATING DEVICE FOR UNCRAFTING LAND UNDER WATER AND METHOD FOR UNCRAFTING LAND.

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BE1015566A5 (en) 2005-06-07
EP1639207A1 (en) 2006-03-29
EP1639207B1 (en) 2009-02-11

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