EP2670921B1 - Tête d'aspiration pour un navire de dragage et procédé pour le dragage à l'aide de ladite tête d'aspiration - Google Patents

Tête d'aspiration pour un navire de dragage et procédé pour le dragage à l'aide de ladite tête d'aspiration Download PDF

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Publication number
EP2670921B1
EP2670921B1 EP12702026.1A EP12702026A EP2670921B1 EP 2670921 B1 EP2670921 B1 EP 2670921B1 EP 12702026 A EP12702026 A EP 12702026A EP 2670921 B1 EP2670921 B1 EP 2670921B1
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EP
European Patent Office
Prior art keywords
suction head
cutting tools
suction
movement
wall part
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.)
Not-in-force
Application number
EP12702026.1A
Other languages
German (de)
English (en)
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EP2670921A1 (fr
Inventor
Bruno Tack
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
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Publication of EP2670921A1 publication Critical patent/EP2670921A1/fr
Application granted granted Critical
Publication of EP2670921B1 publication Critical patent/EP2670921B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E02F3/9256—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head
    • E02F3/9262—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with jets
    • 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
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • 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
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/425—Drive systems for dipper-arms, backhoes or the like
    • 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
    • E02F3/8833—Floating installations
    • E02F3/8841—Floating installations wherein at least a part of the soil-shifting equipment is mounted on a ladder or boom
    • 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
    • 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
    • E02F3/9256—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head

Definitions

  • the invention relates to a suction head for a dredging vessel.
  • the invention also relates to a dredging device comprising a dredging vessel, adapted for movement in a movement direction, a dredge pump positioned on the dredging vessel and provided with a suction connection, a suction conduit that connects the suction head with the suction connection of the dredge pump, and, provided between the dredging vessel and the suction head, support means for supporting the suction conduit, which support means are adapted to determine the depth of the suction head.
  • the invention further relates to a method for dredging ground using said suction head.
  • the known suction head comprises a box shaped construction that is connectable to a suction conduit of a dredging vessel and is shaped like a closed shaft like construction with sidewalls, an upper wall and a lower wall facing the bottom.
  • a visor with an opening at the bottom side thereof is, hingedly around a horizontal axis, attached to the box shaped construction, which visor can in this fashion be rotated up and down, for instance through a hydraulic piston.
  • the visor is further provided with a tooth bar that extends transverse to the direction of movement and is at the bottom side provided with teeth for loosening material to be dredged from the bottom.
  • a number of heel wear pads is provided, that together form the heel plate.
  • such a suction head is trailed over or in the bottom to be dredged, whereby the box shaped construction rests on the bottom with the heel plate, and whereby the teeth turn up the bottom and the loosened bottom material is sucked away through the suction conduit, for instance to a bin provided on the dredging vessel.
  • a suction head is also referred to as a trailing suction hopper suction head.
  • the visor can rotate independently of the box shaped construction.
  • the visor is controlled by the hydraulic piston such that a constant force ensues, the visor will follow the profile of the bottom, whereby the rear wall and the side walls of the visor will more or less penetrate into the bottom, depending on the hardness of the bottom.
  • Due to the sucking action of the suction conduit an underpressure will develop in the suction head, which underpressure among others depends on the extent of sealing of the suction head.
  • the developed underpressure ensures the sucking up of dredged bottom material, whereby water will inevitably also be sucked up from the outside.
  • the known suction head is only suitable for relatively soft bottoms, which is a disadvantage. Indeed, it has been established that with too hard bottoms the teeth of the known suction head do not penetrate sufficiently in the bottom as a result of which a relatively minor amount of bottom material is loosened.
  • the present invention aims to provide a suction head for a dredging vessel with which bottoms, in particular harder bottoms, can be dredged, preferably with an improved efficiency relative to the known suction head.
  • efficiency is understood in the context of the present application the total volume of bottom material that can be dredged per unit of time and per unit of power.
  • a suction head comprises the features of independent claim 1.
  • the invented suction head has proven to be able to dredge bottoms with an improved efficiency relative to the known dredging head. In particular with relatively hard bottoms, such as for instance rock bottoms, good results are obtained.
  • the suction head at its front side (upstream) of the suction opening With a wall part that moves together with the bottom profile, the suction opening at the upstream side of the cutting tools is substantially at all times closed off so as to minimize or avoid that surrounding water will be sucked in through this (unproductive) side.
  • the bottom material/water mixture that is sucked in at the height of the rear side of the suction head through the spaces in between the cutting tools comprises a relatively large amount of bottom material by the action of the cutting tools on the bottom.
  • the suction head rests at the upstream side of the cutting tools on the bottom with its movable wall part and at the height of the rear side with the cutting tools.
  • the movable wall part moves together with the bottom, for instance under its (limited) natural weight, substantially the total weight of the suction head and the suction conduit will be transmitted onto the bottom via the cutting tools. This results in larger generated forces in the bottom at the height of the cutting tools than is possible with the known suction head, whereby it becomes possible to break harder bottoms.
  • the cutting tools attack the bottom at the upstream side of the movable wall part.
  • This proves to be no disadvantage because of the sucking action of the suction conduit.
  • the cutting tools are, in accordance with the invention, provided at the height of or at the rear wall (the downstream wall) of the suction head. By this measure it is not only achieved that less surrounding water is sucked in but it is also prevented that other wall parts of the suction head can come into contact with the bottom, which results in an even larger part of the weight is deviated to the cutting tools. Since the walls of the box shaped construction are substantially rigidly connected to each other the rear wall, the side walls and the fixed front wall part form a rigid unity.
  • the suction head according to the invention is characterized in that the suction head comprises a close off body, that is hingedly connected to the box shaped construction, and in that the movable wall part comprises a wall part of the close off body.
  • the close off body can, if desired, rest onto the bottom with an under rim of said wall part during dredging, without however taking away a lot of weight from the cutting tools.
  • the natural weight of a close off body indeed is substantially lower than the total weight of the suction head and suction conduit, which can surmount 150 ton.
  • the wall part of the close off body comprises a rear wall of the close off body which rear wall is hingedly connected with the side walls of the box shaped construction by means of side walls connected thereto, such that the rear wall can be rotated up and down.
  • the side walls of the close off body in this embodiment act as close off means for surrounding water, since the at least partly can close off the opening between the side walls of the box shaped construction and the bottom.
  • the rear wall of the close off body comprises an upstanding rear wall that partly overlaps with the fixed wall part of the front wall of the box shaped construction.
  • the close off body is preferably provided with an end stop to avoid such large rotation.
  • the end stop it is thus possible that the lower rim of the movable wall part becomes loose from the bottom which causes the suction head to rest on the bottom with the cutting tools only.
  • the wall part of the front wall of the box shaped construction that is movable with the bottom profile, or the closing off wall part of the close off body may extend transverse to the direction of movement of the suction head over part of the width thereof, but will preferably extend over substantially the whole width thereof. It may hereby have advantages when the wall part of the front wall of the box shaped construction that is movable with the bottom profile, or the closing off wall part of the close off body comprises transverse to the direction of movement of the suction head a number of substantially linked up and mutually independently movable sections. In this way, each section can move up and down independently from another section and thereby follow the bottom profile, which bottom profile indeed may vary in the direction transverse to the direction of movement of the suction head.
  • a preferred embodiment of the suction head according to the invention is characterized in that the cutting tools at least at their free end are rotation symmetric.
  • the cutting tools substantially carry the whole weight of the suction head and suction conduit, by which these cutting tools on average carry a higher load than is the case with the known suction head.
  • the cutting tools according to the present embodiment among others have the advantage that they can withstand higher loads than the known teeth.
  • the cutting tools can in principle be attached to the rear wall of the box shaped construction in any conceivable way. It will be apparent that the rear wall needs to have sufficient thickness to be able to accommodate the cutting tools, and to withstand the large forces generated.
  • the cutting tools may for instance be received in recesses, provided in the rear wall for this reason. It is also possible to provide the rear wall with coupling means such as for instance holders in which at least a part of the cutting tools may be accommodated.
  • the cutting tools of the suction head according to the invention are connected to the rear wall such that that they can rotate substantially free around their axis of rotation symmetry.
  • free rotation is meant in this context that the cutting tools may eventually also rotate around their axis of rotation symmetry with some friction, as long as they undergo some rotation in use.
  • the described rotation is made possible because the cutting tools are rotation symmetric. Admitting a free rotation of the cutting tools in the rear wall and/or in the holders decreases the risk for breakage of the cutting tools.
  • the cutting tools are sharpened automatically by friction with the bottom. The duration of use of the cutting tools can herewith be lengthened and time can be saved since on average less broken or blunted cutting tools need to be replaced.
  • the cutting tools are cone shaped or conical, and the cutting tools comprise a substantially cylindrical shaft part with a smaller diameter than the diameter of a conical top part.
  • the cutting tool according to this embodiment is applied with its cylindrical shaft part in coupling means that are provided on the rear wall.
  • the coupling means preferably comprise a block holder with a central bore into which the cylindrical shaft part may be received under a substantially free rotation.
  • the conical top part will extend with an active length out of the block holder, which length is relatively short in comparison to the total length of the cutting tool. This has the advantage that even larger forces may be withstood.
  • the block holder moreover supports in an effective way the cutting tool against flexural deformations.
  • the cutting tools have a length extending out of the holder ranging between 10 and 500 mm, more preferred between 20 and 250 mm, and most preferred between 50 and 150 mm.
  • the conical top part of the cutting tool is preferably provided with a hardened top at the end that contacts the bottom.
  • the top may for instance be made of carbide.
  • the cutting tools form at least one array, that extends or extend according to a straight line substantially transverse to the direction of movement of the suction head.
  • the amount of cutting tools of the suction head according to the invention can be chosen within broad limits.
  • the amount of cutting tools of the suction head is larger, and more preferably significantly lager than the amount of teeth of the known suction head.
  • a larger amount of cutting tools leads on average to a lower penetration depth of the cutting tools in the bottom.
  • the hereby expected lower efficiency is surprisingly completely compensated by providing a suction head according to the invention whereby substantially the total weight is lead via the cutting tools towards the bottom.
  • the amount of cutting tools in an array comprises at least 10, more preferably at least 15 and most preferably at least 20.
  • the amount of arrays preferably ranges between 1 and 10, more preferably between 1 and 5, and most preferably the amount of arrays is 2. With this preferred embodiment, a good compromise is reached between dredging efficiency and the power needed to trail the suction head in the direction of movement over and/or in the bottom.
  • the mutual distance between the cutting tools is among others determined by the dimensions of the cutting tools themselves and by the total weight of the suction head and suction conduit parts that are under water, divided by the amount of cutting tools. Also, the pulling force produced by the dredging vessel may be of importance. Besides that, the properties of the bottom to be dredged are important, for instance the compression strength/tensile strength ratio of the bottom.
  • the cutting tools may in principle be positioned in the longitudinal direction of the suction head (the direction parallel to the direction of movement) in every possible manner. In order to further increase the efficiency of the dredging, it has advantages to position adjacent arrays of cutting tools offset relative to each other. A higher efficiency is hereby achieved.
  • the suction head comprising at least one series (low pressure) jet pipes for injecting a fluid under pressure, preferably water.
  • the jet pipes preferably work under a pressure of at most 50 bar, more preferably at most 30 bar, and most preferably at most 15 bar.
  • the fluid jets produced by the jet pipes under such pressures are adapted to clean the cutting tools and the space between the cutting tools, in other words clear them from bottom material and other materials.
  • the cutting action of the cutting tools is hereby improved and a good sucking in of loosened bottom material is further reached.
  • the jet pipes according to the invention may in principle be positioned before, after, or at the height of the cutting tools. It is also possible to provide the cutting tools themselves with jet pipes, for instance as a central bore.
  • the jet pipes can help to remove already shattered bottom material via the suction conduit, and/or further reduce in size this bottom material.
  • jet pipes that can work under substantially higher pressures of 200 to 1000 bar and more.
  • the fluid jets produced by the jet pipes under such high pressures are adapted to help breaking the bottom.
  • These jet pipes also can, according to the invention, in principle be positioned in front of, after, or at the height of the cutting tools. It is also possible to provide the cutting tools themselves with jet pipes, for instance as a central bore. Jet pipes positioned in front of the cutting tools can help in shattering the bottom by providing a furrow in front of the cutting tools causing the cutting tools to penetrate deeper and thereby breaking out more material.
  • Jet pipes positioned at the height of the cutting tools can help in loosening the pieces of rock and thereby letting the cutting tools penetrate further; the loose pieces indeed no longer are able to absorb the energy of the cutting tools as a "cushion”. Jet pipes positioned behind the cutting tools can help in loosening pieces that were not yet loosened and in transporting the already shattered bottom material via the suction conduit. In general, the flow of such high pressure jet pipes will be lower than the flow that is needed for the low pressure jet pipes.
  • the suction head according to the invention is characterized in that the jet pipes are present between the cutting tools, and this can be between the cutting tools of one array and/or between two or more arrays of cutting tools.
  • the invention also relates to a method for breaking and/or dredging at least partly hard grounds under water with a dredging vessel, equipped with a suction head according to the invention.
  • the method comprises lowering a suction head according to the invention to the bottom and trailing said suction head over the bottom.
  • the suction head is hereby trailed over a bottom to be dredged in a direction of movement and such that substantially the cutting tools alone contact the bottom, and whereby the movable wall part of the front wall of the close off body moves along with the bottom profile.
  • the cutting tools will hereby, under the influence of the weight of the suction head and the suction force, penetrate in the bottom and form fissures herein.
  • the broken off bottom chips are sucked up through the suction conduit, whereby the movable wall part of the front wall ensures that substantially no surrounding water is sucked up via that side and that substantially the total weight of the suction head and suction conduit ends up on the cutting tools.
  • the suction head according to the invention is in particular suitable for dredging bottoms under water having a UCS ('Unconfined Compressive Strength') of at least 5 MPa, preferably at least 20 MPa, and most preferably at least 40 MPa.
  • UCS 'Unconfined Compressive Strength'
  • Figure 1 shows a dredging vessel 1, provided with a motor, not shown in the drawing, for driving a screw propeller 2 via a screw axis for propelling the dredging vessel 1. Further, devices not shown in the drawing for steering the dredging vessel 1 are present, such as a rudder and transversely placed screw propellers to ease maneuvering.
  • a dredge pump In the dredging vessel 1 a dredge pump, not shown in the drawings, is also present.
  • a suction conduit 3 is provided, of which one end is connected to the suction connection of the dredge pump.
  • the suction conduit 3 comprises in the present example two members 3a and 3b that are interconnected by means of a coupling, that allows a certain mutual angular rotation.
  • the connection between the upper member 3a of the suction conduit 3 and the ship also allows some angular rotation in the vertical plane and around the axis.
  • this member To support the movable end of the upper member 3a of the suction conduit 3, this member is connected to a cable 4a, of which the other end is connected to a winch 5a.
  • this member is connected to a cable 4b, of which the other end is connected to a winch 5b.
  • the winches 5a, 5b thus allow to vary the height of the suction conduit 3. It will be apparent that, among others dependent on the depth of the basin to be dredged, the number of members of the suction conduit 3 can be enlarged or diminished, together with a respective adjustment of the number of cables 4 and winches 5.
  • a suction head 6 is provided at the free end of the second member 3b of the suction conduit 3.
  • the known suction head 6 comprises a box shaped construction 7 that is connectable to the suction conduit 3 and has the shape of a closed shaft construction with side walls 7a, 7b (only 7a is visible), an upper wall 7c and a lower wall 7d, facing the bottom.
  • a visor 8 At the rear side (the upstream side relative to the direction of movement P) of the box shaped construction 7, a visor 8, only open at the bottom side, is provided and hingedly connected around a horizontal axis 9 to the box shaped construction 7, whereby it can be rotated up and down by mean of a hydraulic piston, not shown.
  • the visor 8 is further provided with a tooth bar 10 extending transverse to the direction of movement P and at the bottom side provided with teeth 11 for loosening to be dredged material from the bottom.
  • a series of heel wear pads is provided, together forming a heel plate 12.
  • the known suction head 6 rests on the bottom with the heel plate 12, whereby the visor 8 may rotate independently from the box shaped construction 7.
  • the rotation of the visor 8 regulates the desired penetration depth of the teeth 11 in the bottom.
  • the teeth 11 turn up the bottom and the loosened bottom material is sucked away via the suction conduit 3, for instance to a bin, present on the dredging vessel 1.
  • the visor 8 in the known suction head 6 is positioned independently from the box shaped construction 7 such that the best possible sealing between visor 8 and bottom is achieved.
  • the known suction head 6 an important part of the weight is transferred on the bottom via the heel plate 12 and the side walls of the visor 8.
  • the suction head 20 comprises a box shaped construction 21 that is connectable to the suction conduit 3 (or at least to part 3b thereof) of the dredging vessel 1.
  • the box shaped construction 21 is at the bottom side provided with a suction opening 22 and further comprises a rear wall 23, an upper wall 24, side walls 25a, 25b, and a front wall, comprising a fixed wall part 29 and a movable wall part 26e.
  • the movable wall part 26e in the embodiment shown is part of a close off body 26.
  • the rear wall 23 of the box shaped construction 21 also acts as a support body extending transverse to the direction of movement P for cutting tools 30 provided at the bottom side.
  • the upper plate 24 is provided with an opening 24a onto which a conduit may be attached along which water can be supplied under (high) pressure for the jet pipes 35, described further hereunder.
  • the close off body 26 is adapted to, with a wall part 26e thereof, move together with the bottom profile, and such that substantially only the cutting tools 30 contact the bottom.
  • This can for instance be achieved by providing a close off body 26 comprising a sealing plate 26c facing the bottom and to which two side plates 26a, 26b are connected, and an upstanding wall part 26e.
  • the side plates 26a, 26b are hingedly suspended to hooks 27a, 27b of the side walls 25a, 25b.
  • the side plates 26a, 26b can freely rotate around the hooks 27a, 27b whereby they move in guides 28a, 28b, that also act as end stop.
  • the suction opening 22 is formed in the embodiments shown in figures 3-6 between the rear wall 23 and an upstanding fixed wall part 29 of the box shaped construction 21.
  • the close off body 26 By rotating the close off body 26 around the hooks 27a, 27b relative to the box shaped construction 21, the rear wall part 26e of the close off body 26 will so to speak move along (and in front of) the fixed wall part 29 of the front wall of the box shaped construction 21. Both wall parts 29, 26e are shaped such that such gliding past each other is possible.
  • the close off body 26 is preferably provided with an end stop 28 that cooperates with a hook (not shown) on side plate 26a.
  • the close off body 26, and therefore also wall part 26e that moves together with the bottom profile, extends transverse to the direction of movement of the suction head 1 over substantially the whole width of the suction head.
  • the close off body 26 comprises a number of substantially linked up and mutually independently movable sections that extend transverse to the direction of movement of the suction head 1.
  • the cutting tools 30 in the embodiment shown form two arrays 31, 32, which arrays extend along a straight line, substantially perpendicular to the direction of movement P of the suction head 1.
  • Each array comprises 23 cutting tools 30.
  • such a high number of cutting tools on average leads to a lower penetration depth of the cutting tools 30 in the bottom.
  • substantially the whole weight of the trailing head and suction conduit is transferred to the bottom via the cutting tools 30, this effect is substantially annihilated.
  • the cutting tools 30 of array 31 are positioned offset relative to the cutting tools 30 of the second array 32.
  • the suction head 1 is provided with two arrays 33, 34 of jet pipes 35 that are adapted to inject a fluid, in particular water, under a low (at most 50 bar) and/or high pressure (of 1000 bar and higher) between the cutting tools 30.
  • the jet pipes 35 are situated in the embodiment shown between the cutting tools 30 but it is also possible to aim the jet pipes 35 towards the bottom, in particular the high pressure jet pipes.
  • the cutting tools 30 may in principle comprise any cutting tool suitable for dredging bottom material, such as for instance the known teeth.
  • the cutting tools 30 are at least at their free end rotation symmetric, whereby each cutting tool 30 is connected with the rear wall 23 by means of coupling means 36.
  • the cutting tools 30 comprise a substantially cylindrical shaft part 301 with a smaller diameter than the diameter of a conical top part 302.
  • the cutting tool 30 is applied with the cylindrical shaft part 301 in the coupling means 36 provided on the rear wall 23.
  • the coupling means 36 hereto comprise a block holder 361 with a central bore 362 into which the cylindrical shaft part 301 is accepted under substantially free rotation.
  • the conical top part 302 extends over an active length out of the block holder 361, which length is relatively short compared to the total length of the cutting tool 30. This has the advantage of being able to withstand large forces.
  • the block holder 361 moreover supports in an effective way the cutting tool 30 against flexural deformations.
  • the conical top part 302 is provided with a hardened carbide top 303, that comes into contact with the bottom.
  • the cutting tool 30 is inserted in the central bore 362 until the click connection 363 impinges on a correspondingly ring shaped recess 364 of the holder 361. In this state, the cutting tool 30 can rotate substantially free around the axis 37, such that it sharpens itself.
  • an at least partly hard ground may advantageously be broken and/or dredged under water, whereto the suction head is attached to the suction conduit 3 of a dredging vessel 1, lowered onto the bottom and trailed along said bottom in a trailing direction P, and such that substantially only the cutting tools 30 make contact with the bottom.
  • the close off body 26 is hereby positioned such that it rests on the bottom with the rim 26d and can rotate substantially free around the hooks 27a, 27b.
  • substantially the total weight of the suction head 1 and the suction conduit 3 is transferred to the bottom via the cutting tools 30.

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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)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Manipulator (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Sewage (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Claims (15)

  1. Tête d'aspiration (20) pour navire de dragage (1), adaptée pour se déplacer dans un sens de déplacement P, la tête d'aspiration (20) comprenant une construction en forme de caisson (21), dotée sur sa face inférieure d'une ouverture d'aspiration (22) et comportant un raccordement pour une conduite d'aspiration (3) du navire de dragage (1), comportant par ailleurs une paroi arrière (23) et une paroi avant (29, 26e) d'extension sensiblement transversale au sens de déplacement P, et des parois latérales (25a, 25b) s'étendant chacune de façon sensiblement parallèle au sens de déplacement P, ainsi qu'une paroi supérieure (24) disposée du côté orienté à l'opposé du fond, étant entendu que la paroi avant (29, 26e) inclut une pièce fixe (29) de paroi avant et étant entendu que la paroi arrière, les parois latérales et la pièce fixe de paroi avant forment une unité rigide et que la paroi arrière (23) est dotée sur sa face inférieure d'outils de coupe (11, 30) servant à pénétrer dans le fond, des espaces y étant ménagés entre les outils de coupe, espaces par lesquels un mélange de matériau du fond et d'eau peut être aspiré, caractérisé en ce que la paroi avant (29, 26e) comprend par ailleurs une pièce mobile (26e) de paroi qui se déplace en épousant le profil du fond et obture sensiblement à tout moment l'ouverture d'aspiration du côté amont des outils de coupe.
  2. Tête d'aspiration selon la revendication 1, la tête d'aspiration comprenant un corps d'obturation (26) qui est relié à charnières à la construction en forme de caisson (21), la pièce mobile de paroi consistant en une pièce (26e) de paroi du corps d'obturation (26).
  3. Tête d'aspiration selon la revendication 2, étant entendu que la pièce (26e) de paroi du corps d'obturation (26) consiste en une paroi arrière (26e) du corps d'obturation (26), la paroi arrière étant reliée à charnières (27a, 27b) aux parois latérales (25a, 25b) de la construction en forme de caisson (21) au moyen de parois latérales (26a, 26b) reliées à la paroi arrière (26e) de telle sorte que la paroi arrière (26e) puisse effectuer une rotation vers le haut et vers le bas.
  4. Tête d'aspiration selon la revendication 3, étant entendu que la paroi arrière (26e) du corps d'obturation (26) consiste en une paroi arrière dressée recouvrant partiellement la pièce fixe (29) de paroi de la paroi avant (29, 26e) de la construction en forme de caisson (21).
  5. Tête d'aspiration selon l'une quelconque des revendications précédentes, étant entendu que la pièce (26e) de paroi qui se déplace en épousant le profil du fond, s'étend transversalement au sens de déplacement P de la tête d'aspiration sur sensiblement toute la largeur de celle-ci.
  6. Tête d'aspiration selon l'une quelconque des revendications précédentes, étant entendu que la pièce (26e) de paroi qui se déplace en épousant le profil du fond, comprend un certain nombre de sections sensiblement couplées et mobiles de façon mutuellement indépendante, transversales au sens de déplacement de la tête d'aspiration.
  7. Tête d'aspiration selon l'une quelconque des revendications précédentes, étant entendu que les outils de coupe (30) sont à rotation symétrique au moins à leur extrémité libre.
  8. Tête d'aspiration selon l'une quelconque des revendications précédentes, étant entendu que les outils de coupe (11, 30) forment au moins un agencement qui s'étend ou s'étendent suivant une ligne droite (11, 12) sensiblement transversale au sens de déplacement.
  9. Tête d'aspiration selon la revendication 8, étant entendu que le nombre d'outils de coupe (11, 30) dans un agencement est d'au moins 15.
  10. Tête d'aspiration selon la revendication 8 ou 9, étant entendu que le nombre d'agencements est d'au moins 2.
  11. Tête d'aspiration selon l'une quelconque des revendications précédentes, étant entendu que la tête d'aspiration (1) comprend au moins un agencement de tuyères servant à injecter de l'eau sous pression.
  12. Tête d'aspiration selon la revendication 11, étant entendu que la paroi arrière de la construction en forme de caisson comprend au moins un agencement de tuyères.
  13. Tête d'aspiration selon la revendication 11 ou 12, étant entendu que les tuyères sont disposées entre les outils de coupe.
  14. Dispositif de dragage comprenant un navire de dragage (1) adapté pour se déplacer dans un sens de déplacement P, une tête d'aspiration (20) selon l'une quelconque des revendications 1-13, reliée au navire de dragage (1), une pompe de dragage dotée d'un raccord d'aspiration disposé sur le navire de dragage, une conduite d'aspiration (3) reliant la tête d'aspiration (20) au raccord d'aspiration de la pompe de dragage, et des moyens de support (4a, 4b, 5a, 5b) disposés entre le navire de dragage (1) et la tête d'aspiration (20) pour supporter la conduite d'aspiration (3), les moyens de support étant adaptés pour réguler la profondeur de la tête d'aspiration.
  15. Procédé permettant de draguer du matériau sur un fond sous l'eau avec un navire de dragage équipé d'une tête d'aspiration (20) selon l'une quelconque des revendications 1-13, ou d'un dispositif de dragage selon la revendication 14, étant entendu que la tête d'aspiration (20) est traînée sur un fond à draguer dans un sens de déplacement et de telle sorte que sensiblement seuls les outils de coupe (11, 30) entrent en contact avec le fond et étant entendu que la pièce mobile (26e) de paroi de la paroi arrière (26e, 29) de la tête d'aspiration (20) se déplace en épousant le profil du fond.
EP12702026.1A 2011-02-02 2012-01-31 Tête d'aspiration pour un navire de dragage et procédé pour le dragage à l'aide de ladite tête d'aspiration Not-in-force EP2670921B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2011/0065A BE1019788A4 (nl) 2011-02-02 2011-02-02 Zuigkop voor een baggerschip en werkwijze voor het baggeren met behulp van deze zuigkop.
PCT/EP2012/051589 WO2012104314A1 (fr) 2011-02-02 2012-01-31 Tête d'aspiration pour un navire de dragage et procédé pour le dragage à l'aide de ladite tête d'aspiration

Publications (2)

Publication Number Publication Date
EP2670921A1 EP2670921A1 (fr) 2013-12-11
EP2670921B1 true EP2670921B1 (fr) 2018-08-29

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EP12702026.1A Not-in-force EP2670921B1 (fr) 2011-02-02 2012-01-31 Tête d'aspiration pour un navire de dragage et procédé pour le dragage à l'aide de ladite tête d'aspiration

Country Status (10)

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EP (1) EP2670921B1 (fr)
AR (1) AR085106A1 (fr)
AU (1) AU2012213492B2 (fr)
BE (1) BE1019788A4 (fr)
BR (1) BR112013019626A2 (fr)
CO (1) CO6781500A2 (fr)
ES (1) ES2699963T3 (fr)
RU (1) RU2603685C2 (fr)
SG (1) SG191939A1 (fr)
WO (1) WO2012104314A1 (fr)

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BE1021095B1 (nl) * 2013-11-04 2016-01-18 VAN ROMPAY BOUDEWIJN GABRIëL Inrichting en werkwijze voor het verwijderen van slib van de bodem van een watergebied
CN104818739A (zh) * 2015-05-05 2015-08-05 明光市留香泵业有限公司 海底吸沙作业专用抽吸盾头
BE1024130B1 (nl) * 2016-02-05 2017-11-20 Baggerwerken Decloedt En Zoon N.V. Baggerkop en bijbehorende werkwijze voor het vormen van een geul in een onderwaterbodem
US10450720B2 (en) * 2016-04-21 2019-10-22 Boudewijn Gabriël Van Rompay Device and method for removing alluvial deposits from the bed of a body of water
JP7014611B2 (ja) * 2018-01-04 2022-02-01 石堂 知司夫 浚渫用構造体
CN111827387B (zh) * 2020-06-30 2022-04-26 黑龙江省水利科学研究院 一种水渠清淤装置
CN111794299B (zh) * 2020-08-21 2022-04-08 广东济通集团有限公司 一种小型河道清淤装置
CN114277873B (zh) * 2022-01-20 2022-12-27 安徽省公路工程建设监理有限责任公司 一种道路工程建设用防堵清淤装置

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Also Published As

Publication number Publication date
SG191939A1 (en) 2013-08-30
BR112013019626A2 (pt) 2020-11-24
CO6781500A2 (es) 2013-10-31
EP2670921A1 (fr) 2013-12-11
BE1019788A4 (nl) 2012-12-04
AR085106A1 (es) 2013-09-11
AU2012213492A1 (en) 2013-08-01
ES2699963T3 (es) 2019-02-13
WO2012104314A1 (fr) 2012-08-09
RU2013140457A (ru) 2015-03-10
RU2603685C2 (ru) 2016-11-27
AU2012213492B2 (en) 2017-03-16

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