WO1989007691A1 - Dragues ameliorees - Google Patents

Dragues ameliorees Download PDF

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Publication number
WO1989007691A1
WO1989007691A1 PCT/EP1989/000112 EP8900112W WO8907691A1 WO 1989007691 A1 WO1989007691 A1 WO 1989007691A1 EP 8900112 W EP8900112 W EP 8900112W WO 8907691 A1 WO8907691 A1 WO 8907691A1
Authority
WO
WIPO (PCT)
Prior art keywords
support member
vessel
thrust means
area
water
Prior art date
Application number
PCT/EP1989/000112
Other languages
English (en)
Inventor
Paul John Burring
Original Assignee
Rapid Multipurpose (Uk) Wing Dredging Co Ltd.
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 Rapid Multipurpose (Uk) Wing Dredging Co Ltd. filed Critical Rapid Multipurpose (Uk) Wing Dredging Co Ltd.
Priority to EP89902038A priority Critical patent/EP0419484B1/fr
Priority to KR1019890701747A priority patent/KR900700700A/ko
Priority to DE68926295T priority patent/DE68926295T2/de
Publication of WO1989007691A1 publication Critical patent/WO1989007691A1/fr
Priority to GR960401931T priority patent/GR3020562T3/el

Links

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
    • 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
    • E02F3/9206—Digging devices using blowing effect only, like jets or propellers
    • 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
    • B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/003—Dredgers or soil-shifting machines for special purposes for uncovering conduits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
    • E02F5/104—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
    • E02F5/104—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water
    • E02F5/107—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water using blowing-effect devices, e.g. jets
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
    • E02F5/287—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways with jet nozzles

Definitions

  • This invention relates to dredgers for removing sand, silt and like material from the river or sea bed, and has application, for example, to clearing wrecks.
  • a suction dredger is the most widely used apparatus for lifting such material, the suction being created by a motor and pump unit, somewhat like a vacuum cleaner.
  • a motor and pump unit somewhat like a vacuum cleaner.
  • such apparatus has the disadvantage that small and/or lightweight articles from the wreck can also be lifted and, even if a screen is provided in the suction path, the articles may be small enough to pass through the screen, or they may become damaged by hitting the screen, or be difficult to extract from the other debris lifted.
  • a modified form of the suction method which is used in tidal waters, is to provide a vertical length of pipe above the area to be cleared near the lower end of which air is let under pressure to pass upwardly through said pipe. This creates a vacuum, which will act to lift the sand, silt and like material and set it in suspension with the water, whereafter it may be carried away from the area by the tide.
  • This method is reliable in reducing the possibility of small/lightweight articles being lost, but is time consuming due to the relatively small diameter of the pipe, normally around 0.5 metres, and hence restricted area covered.
  • Another method which can be used in relatively shallow tidal waters, eg up to about 10 metres in depth, is by mooring a tug, ship or other vessel in a fixed position above the area to be cleared and deflecting the propeller wash downwardly using a suitable guide plate. The wash disturbs the material around the wreck, which material is thereby lifted, set in suspension and carried away from the area by the tide.
  • Another disadvantage of this method is that, for a large wreck, the position of the vessel must be changed progressively to cover the complete area of the wreck, which is difficult and time consuming.
  • the present invention provides a method of dredging in flowing water characterised by lowering a support member carrying thrust means so that the thrust means is directed downwardly towards the area to be cleared, adjusting the orientation of the support member in the water so that it presents a surface relative to the flow which causes a resultant downward vertical component of force, and operating said thrust means to direct a wash of water towards said area, whereby the turbulence created sets the sand, silt and like material covering the area in suspension in the water so as to be carried away from said area by the flow of the water, the weight of the support member and said resultant downward force component in use being designed to provide a downward force in excess of the upward force caused by said thrust means (3).
  • the support member is lowered from a vessel.
  • a vessel can be dynamically held in position by thrusters, or mounted on a trestle sitting on the sea or river bed it will normally be set in its correct orientation by the adjustment of, for example, cables, chains or telescopic arms.
  • the vessel may initially be stationed immediately downstream of the area to be cleared, whereafter the vessel is moved forward to cover the complete area at a controlled speed, this movement acting to increase the resultant downward force component on the support member.
  • the support member can be designed to work in opposite directions, so that the vessel can then be turned and retraced over the area, after re-setting the orientation of the support member by adjustment of the cables.
  • dredging apparatus for carrying the above method comprising, a support member having thrust means mounted thereon, means to orientate the support member to maintain the thrust means in a downward attitude, said support member providing a face against which the water flow can act to provide a resultant downward component of force, the arrangement being such that in use, the weight of the support member together with the resultant force component produced provide a downward force which exceeds the upward force provided by the thrust means.
  • the means to orientate the support member preferably comprises cables or the like connected to the support member at at least three spaced points. Said means may be mounted to an associated vessel.
  • the support member is generally in the form of a wing comprising a casing having ballast tanks to adjust its weight, depending upon the working depth and the type of material to be cleared, said casing also having at least one closed bore passing between its upper and lower faces, in which said thrust means is located.
  • the casing is provided with an angled face at least along one (leading) edge thereof which, at least in part, causes the resultant downward force component in use; this component can be varied by appropriately tilting the casing so that its upper surface is angled to the horizontal.
  • the thrust means and the drive therefore can be made reversible, so that, for more general applications, the apparatus can be used as a suction dredger.
  • the thrust means may comprise one or more propellers, each mounted within a closed bore, to rotate substantially parallel to the plane of the casing, in which case drive means for the propeller(s) are mounted on the casing and may be driven from an energy source on board the vessel by a cable, hose or the like.
  • the energy source may be an electric generator and the drive means electric motors.
  • the source of energy may be a hydraulic pump on board the vessel and pressure fluid may be circulated through the drive unit via flexible hoses, the drive unit comprising an hydraulic motor including gearing which meshes suitably with gearing on the or each propeller shaft.
  • the support member may be provided with transducers, and/or sonar, or like devices, directed downwardly so that, in use, electrical signals indicative of the working distance, and work progress can be transmitted to a suitable display on board the vessel.
  • Figure 1 is a schematic view showing the dredging method
  • Figures 2 (a), (b) and (c) are diagrammatic end, side and plan views respectively of a first example of dredging apparatus according to the invention.
  • Figure 3 is a sectional side view of said dredging apparatus
  • Figure 4 is a view similar to Figure 2(a) partly cut away
  • Figure 5 is a vertical section through a second example of dredging apparatus according to the invention.
  • Figures 6 and 7 are plan and front views of the dredging apparatus of Figure 5
  • Figure 8 is a part section part elevation of part of the dredging apparatus of Figure 5 and
  • Figure 9 shows a general arrangement of a cable mounting means for mounting the dredging apparatus of Figure 5.
  • a carrying vessel 1 moving forward against the tidal flow over a wreck 2.
  • the area to be covered can be buoyed along each side, or perhaps in channels if a wide area is involved, to provide guide tracks for the vessel.
  • the carrying vessel can be stationed over the area by a four point mooring, or it can be dynamically positioned.
  • a weighted support member 3 is suspended at an appropriate distance from the wreck via two pairs of cables 4, 5 arranged fore and aft, one cable of each pair extending from each side of the vessel. The cables of each of the pairs can be driven in unison so as to ensure that the support member maintains a horizontal attitude laterally.
  • the two cable pairs are preferably driven independently so that the attitude of the support member 3 can be adjusted with respect to the horizontal in its longitudinal (fore and aft) direction.
  • the support member 3 is generally in the form of a wing and is rectangular in plan. It is constructed as a casing comprising vertical end walls 6, connected by laterally extending walls 7, which provide angled faces 8 to provide a downward vertical component of force when acted on by tidal flow.
  • the upper wall 9 is generally flat, so that it can be raised and conveniently stowed just beneath the bottom of the carrying vessel 1 (as shown chain dotted in Figure 1) when being transported to or from the area of operations and the lower wall 10 has a convex curve to provide the wing with a hydrofoil section, and thus produce an additional downward force component.
  • the support member is symmetrical about its lateral axis so that it can be used in either direction with the respective lateral wall 7 leading. It will also be seen that two spaced fixing points 11 are provided on each end wall 6 for the cables 4, 5.
  • the casing 3 is provided with two closed vertical bores 12 (see Figure 2(c) and 3) which are laterally spaced from each other, each housing a propeller 13 which is mounted via its shaft 14 and support member bearings 15 on spider support member arms 16 (see Figures 2(c).-
  • the propellers 13 are thus mounted to rotate substantially in the plane of the casing 3 and are driven in opposition to reduce the effect of centrifugal/centripetal forces. They are driven via appropriate gearing 17 from respective drive shafts 18, which in turn are driven by a central hydraulic unit 19, through which pressure fluid is circulated via feed and return hoses 20,21 from a source on board the vessel 1.
  • the support member casing 3 is provided with a number of ballast tanks 22 so that the weight of said casing can be adjusted by the injection/ejection of a suitable ballast medium such as water and/or sand, silt, etc from the area being cleared.
  • a suitable ballast medium such as water and/or sand, silt, etc from the area being cleared.
  • the lowest thrust required to lift the material to be cleared should be used.
  • weight adjustment of the support member casing is necessary, depending upon the depth at which working is to be effected and the amount of thrust required to be generated by the propellers, which in turn will depend upon the nature of the material being cleared, eg light or heavy sand, silt, gravel etc.
  • a downward vertical component of force is provided by the leading angled face 8 when acted on by the tide, and/or forward speed of the vessel, which component can be increased by adjustment of the fore cables 4 with respect to the aft cables 5 to tilt the casing, and hence the upper wall 9 thereof, appropriate to the horizontal.
  • a transducer/sonar arrangement comprising a pair of transducers 25 (see Figure 3) to detect distance, which are set one on the lower wall 16 adjacent each leading/trailing edge 7 of the support member casing 3 and, for TV monitoring, a centrally mounted sonar transmitter/receiver 26 which can rotate, and thereby scan, through 360° around the vertical axis of the casing 3.
  • the support member casing In a practical construction in accordance with the invention, capable of operating down to a depth of approximately 45 metres of water, the support member casing would have dimensions of the order of 9000 x 6000 mm with a weight of .up to about 20 tonnes. This would require a thrust (bolland pull) by the support member casing of up to 4 tonnes. In addition, it has been calculated that, with a casing of such size tilted 20° from the horizontal, a resultant downward vertical component of force of up to 0.77 tonnes would be generated, depending upon the combined speeds of the tide flow and vessel. To counter the weight and force components the propellers would be designed to produce a thrust of up to about 4.5 tonnes.
  • the thrust means (propellers) and the drive therefore can be made reversible, so that the apparatus may be used as a suction dredger for general clearing operations.
  • the thrust means would act directly on the wing casing 3 to provide a substantial downward component of force and, hence, tilting of the casing in use would not be so important in this mode of operation.
  • Figures 5-9 show an alternative embodiment of the invention. Similar parts carrying similar numbers to the embodiments of Figures 2-4.
  • the support member 3 is generally in the form of a wing and is rectangular in plan. Referring to Figure 5, it will be seen that the support member 3 is constructed of three units, a fore unit 3A, a mid unit 3B and an aft unit 3C connected together, so that the support member can be split into three sections for ease of transportation.
  • Each closed vertical bore 12 extends up through a respective fin 51,52.
  • the propellers 13 are driven by respective electric motors 53 via a gear box 54 as is shown in more detail in Figure 8.
  • Each electric motor 53, gear box 54 and propellers 13 are mounted by six stays 66 extending to the wall of the respective bore 12, one of the stays 66 carrying an electric cable 57.
  • the wing dredger may be suspended in the manner shown in Figure 9 (the support member (3) being shown in diagrammatic form only) .
  • Two cables 58 may pass down from the support membering vessel to a respective ring 59, each ring carrying a loop 61 of cable.
  • Each loop 61 passes over a respective pair of drums 62,63, one drum 62 being adjacent the front edge of the dredger and the other drum 63 being adjacent the rear edge of the dredger.
  • Each loop 61 of cable is also looped over a respective drive drum 64 mounted towards the middle of the dredger.
  • each drum 64 may be driven by, for example, an electric motor (not shown).
  • the dredgers described above have many uses, for example they can be simply used for a normal dredging purpose, that is clearing a channel in a river or the sea.
  • a dredger of lateral dimensions approximately 9m x 6m may be used to clear from a river or sea bed of heavy clay a channel approximately 10m wide, 5m deep and 100m long in approximately 6 hours. Thus in that 6 hour period it would move something of the order of 300 tonnes of heavy clay.
  • the dredger may be used in salvaging, that is for clearing mud and silt from wrecks.
  • a particularly interesting use is to dredge a trench in which oil pipelines may be inserted and then by a similar operation of the dredger, the trench may be backfilled.
  • the dredger may be used to clear silt away from what is called in the oil industry, "Christmas trees”.
  • the dredger may also be used to level a site on which an oil platform is to be mounted and can be conveniently used to remove the silt which accumulates around the legs of an oil rig, so that the oil rig may be removed.
  • the dredger may be used to remove the top layer of silt from the river or sea bottom so that an offshore mining operation can get to the required lower layers.
  • the dredger has been shown suspended from a vessel, in practice it can also be suspended from a jib of a crane cited on a quay or from a flat topped barge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Treatment Of Sludge (AREA)
  • Fertilizing (AREA)
  • Vending Machines For Individual Products (AREA)
  • Surgical Instruments (AREA)
  • Toys (AREA)
  • Catching Or Destruction (AREA)
  • Executing Machine-Instructions (AREA)
  • Centrifugal Separators (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

Le procédé et l'appareil décrits, qui servent à effectuer des opérations de dragage dans des courants d'eau, utilisent un élément de support (3) qui portent un organe de poussée (13), de sorte que celui-ci est dirigé vers le bas en direction de la zone à draguer. L'élément de support (3) est monté dans l'eau de façon à présenter, pendant son fonctionnement, une surface dirigée dans le sens d'écoulement de l'eau, ce qui crée une composante de force résultante descendante qui équilibre la composante de force ascendante créée par l'organe de poussée (13).
PCT/EP1989/000112 1988-02-09 1989-02-03 Dragues ameliorees WO1989007691A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP89902038A EP0419484B1 (fr) 1988-02-09 1989-02-03 Dragues ameliorees
KR1019890701747A KR900700700A (ko) 1988-02-09 1989-02-03 준설장치
DE68926295T DE68926295T2 (de) 1988-02-09 1989-02-03 Bagger
GR960401931T GR3020562T3 (en) 1988-02-09 1996-07-17 Improvements relating to dredgers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888802907A GB8802907D0 (en) 1988-02-09 1988-02-09 Wing dredger
GB8802907 1988-02-09

Publications (1)

Publication Number Publication Date
WO1989007691A1 true WO1989007691A1 (fr) 1989-08-24

Family

ID=10631349

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1989/000112 WO1989007691A1 (fr) 1988-02-09 1989-02-03 Dragues ameliorees

Country Status (11)

Country Link
EP (2) EP0328198A1 (fr)
KR (1) KR900700700A (fr)
AT (1) ATE136967T1 (fr)
AU (1) AU3039889A (fr)
DE (1) DE68926295T2 (fr)
ES (1) ES2088907T3 (fr)
GB (1) GB8802907D0 (fr)
GR (1) GR3020562T3 (fr)
SG (1) SG64359A1 (fr)
WO (1) WO1989007691A1 (fr)
ZA (1) ZA89922B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11828042B2 (en) 2020-05-25 2023-11-28 Wing Marine Llc Material handling systems and methods

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297777A (en) * 1995-02-07 1996-08-14 Hollandsche Betongroep Nv Underwater excavation apparatus
GB9512602D0 (en) * 1995-06-21 1995-08-23 Susman Hector F A Improvements in or relating to underwater excavation apparatus
GB2315787B (en) * 1996-03-01 1999-07-21 Seabed Impeller Levelling And Dredging apparatus
DE69630716T2 (de) * 1996-12-19 2004-09-30 Rotech Holdings Ltd. Verbesserungen bezüglich einer unterwasserbaggervorrichtung
NL1007800C2 (nl) * 1997-12-16 1999-06-17 Dredging Int Werkwijze voor het vrijmaken van een tenminste gedeeltelijk in een waterbodem gelegen voorwerp en een inrichting hiervoor.
GB9807070D0 (en) * 1998-04-01 1998-06-03 Seabed Impeller Levelling And Dredging apparatus
GB2359101A (en) * 2000-02-09 2001-08-15 Thomas Hasler Dredging Vessel
FR2825394A1 (fr) * 2001-06-01 2002-12-06 Philippe Kerherno Engin de dragage pour souille de quai dans un port fluvial
GB2444259B (en) 2006-11-29 2011-03-02 Rotech Holdings Ltd Improvements in and relating to underwater excavation apparatus
DE102008022115A1 (de) * 2008-05-05 2009-11-12 Ralph Melkau Vorrichtung zur Beseitigung von Sedimenten auf Gewässerböden
GB201614460D0 (en) * 2016-08-24 2016-10-05 Rotech Group Ltd Improvements in and relating to underwater excavation apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR920546A (fr) * 1946-01-21 1947-04-10 Smit & Zoon S Scheeps En Werkt Perfectionnements aux dragues aspirantes
FR997304A (fr) * 1945-07-06 1952-01-04 Perfectionnement aux appareils de draguage et analogues
US3706142A (en) * 1969-09-17 1972-12-19 Shell Oil Co Submarine dredging apparatus
US4123858A (en) * 1971-07-06 1978-11-07 Batchelder George W Versatile submersible device for dredging or other underwater functions
FR2389533A1 (fr) * 1977-05-04 1978-12-01 Nal Expl Oceans Centre
EP0012458A1 (fr) * 1978-12-06 1980-06-25 Konijn Machinebouw B.V. Appareil à désagréger et à évacuer de la terre, notamment sous l'eau
US4253255A (en) * 1979-01-08 1981-03-03 Durell William E Automated dredging with vacuum assist

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR997304A (fr) * 1945-07-06 1952-01-04 Perfectionnement aux appareils de draguage et analogues
FR920546A (fr) * 1946-01-21 1947-04-10 Smit & Zoon S Scheeps En Werkt Perfectionnements aux dragues aspirantes
US3706142A (en) * 1969-09-17 1972-12-19 Shell Oil Co Submarine dredging apparatus
US4123858A (en) * 1971-07-06 1978-11-07 Batchelder George W Versatile submersible device for dredging or other underwater functions
FR2389533A1 (fr) * 1977-05-04 1978-12-01 Nal Expl Oceans Centre
EP0012458A1 (fr) * 1978-12-06 1980-06-25 Konijn Machinebouw B.V. Appareil à désagréger et à évacuer de la terre, notamment sous l'eau
US4253255A (en) * 1979-01-08 1981-03-03 Durell William E Automated dredging with vacuum assist

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11828042B2 (en) 2020-05-25 2023-11-28 Wing Marine Llc Material handling systems and methods

Also Published As

Publication number Publication date
EP0419484B1 (fr) 1996-04-17
KR900700700A (ko) 1990-08-16
DE68926295D1 (de) 1996-05-23
SG64359A1 (en) 1999-04-27
GR3020562T3 (en) 1996-10-31
DE68926295T2 (de) 1997-01-02
AU3039889A (en) 1989-09-06
EP0419484A1 (fr) 1991-04-03
EP0328198A1 (fr) 1989-08-16
ATE136967T1 (de) 1996-05-15
ZA89922B (en) 1990-05-30
GB8802907D0 (en) 1988-03-09
ES2088907T3 (es) 1996-10-01

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