EP1639207B1 - 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
EP1639207B1
EP1639207B1 EP04737669A EP04737669A EP1639207B1 EP 1639207 B1 EP1639207 B1 EP 1639207B1 EP 04737669 A EP04737669 A EP 04737669A EP 04737669 A EP04737669 A EP 04737669A EP 1639207 B1 EP1639207 B1 EP 1639207B1
Authority
EP
European Patent Office
Prior art keywords
cutter head
cover
dredging
cut
dredging material
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.)
Expired - Fee Related
Application number
EP04737669A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1639207A1 (en
Inventor
Stefaan George Charles Vandycke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baggerwerken Decloedt and Zoon NV
Original Assignee
Baggerwerken Decloedt and Zoon NV
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 and Zoon NV filed Critical Baggerwerken Decloedt and Zoon NV
Publication of EP1639207A1 publication Critical patent/EP1639207A1/en
Application granted granted Critical
Publication of EP1639207B1 publication Critical patent/EP1639207B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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 according to the preamble of claim 1.
  • 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 according to the preamble of claim 5.
  • Another 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 by the features of claim 1. 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 According cover is rotatably mounted and 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.
  • 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 are 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 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 according to claim 5.
  • 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.
  • 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.
  • 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 P1.
  • 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 P1.
  • 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)
EP04737669A 2003-06-12 2004-06-10 Device and method for dislodging and recovering dredging material Expired - Fee Related EP1639207B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2003/0356A BE1015566A5 (nl) 2003-06-12 2003-06-12 Inrichting en werkwijze voor het losmaken en winnen van baggermateriaal.
PCT/BE2004/000085 WO2004111354A1 (en) 2003-06-12 2004-06-10 Device and method for dislodging and recovering dredging material

Publications (2)

Publication Number Publication Date
EP1639207A1 EP1639207A1 (en) 2006-03-29
EP1639207B1 true EP1639207B1 (en) 2009-02-11

Family

ID=33545839

Family Applications (1)

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

Country Status (3)

Country Link
EP (1) EP1639207B1 (nl)
BE (1) BE1015566A5 (nl)
WO (1) WO2004111354A1 (nl)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0623450D0 (en) 2006-11-24 2007-01-03 Drabble Ray Faunal friendly dredging system
BE1018582A3 (nl) * 2009-01-10 2011-04-05 Dredging Int Ontgraafinrichting voor het ontgraven van grond onder water en werkwijze voor het ontgraven van grond.

Family Cites Families (9)

* 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
NL178344C (nl) * 1975-11-10 1986-03-03 Anglo Dutch Dredging Co Sleepzuiger met rol in de zuigkop van de zuigbuis.
NL7812140A (nl) * 1978-12-13 1980-06-17 Reba Bv Zuigkop voor een sleepzuiger.
JPS58168731A (ja) * 1982-03-29 1983-10-05 Penta Ocean Constr Co Ltd 浚渫装置
JPS61261533A (ja) * 1985-05-13 1986-11-19 Penta Ocean Constr Co Ltd 後進浚渫可能な浚渫装置
DE3710283C2 (de) * 1987-03-28 1998-04-16 Zueblin Ag Einrichtung zum Abbau und Abtransport von kontaminiertem Erdreich
NL9200368A (nl) * 1992-02-28 1993-09-16 Ihc Holland Nv Cutter-samenstel zoals voor montage aan de ladder van een baggerzuiger.
US6318005B1 (en) * 2000-06-16 2001-11-20 Ellicott Machine Corporation International Dredge with improved auger shroud

Also Published As

Publication number Publication date
WO2004111354A1 (en) 2004-12-23
BE1015566A5 (nl) 2005-06-07
EP1639207A1 (en) 2006-03-29

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