EP1039041A1 - Verfahren zum Positionieren eines Ausgrabungswerkzeugs in Bezug auf ein Schiff, und Schiff mit einem Ausgrabungswerkzeug - Google Patents

Verfahren zum Positionieren eines Ausgrabungswerkzeugs in Bezug auf ein Schiff, und Schiff mit einem Ausgrabungswerkzeug Download PDF

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Publication number
EP1039041A1
EP1039041A1 EP00201049A EP00201049A EP1039041A1 EP 1039041 A1 EP1039041 A1 EP 1039041A1 EP 00201049 A EP00201049 A EP 00201049A EP 00201049 A EP00201049 A EP 00201049A EP 1039041 A1 EP1039041 A1 EP 1039041A1
Authority
EP
European Patent Office
Prior art keywords
hinge connection
vessel
digging tool
travel
elongated element
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.)
Withdrawn
Application number
EP00201049A
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English (en)
French (fr)
Inventor
Johannes Wilhelmus Jacobus Mikx
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.)
GustoMSC BV
Original Assignee
Marine Structure Consultants MSC BV
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 Marine Structure Consultants MSC BV filed Critical Marine Structure Consultants MSC BV
Publication of EP1039041A1 publication Critical patent/EP1039041A1/de
Withdrawn legal-status Critical Current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
    • E02F3/905—Manipulating or supporting suction pipes or ladders; Mechanical supports or floaters therefor; pipe joints for suction pipes
    • 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
    • E02F3/907—Measuring or control devices, e.g. control units, detection means or sensors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/06—Floating substructures as supports
    • E02F9/067—Floating substructures as supports with arrangements for heave compensation

Definitions

  • the invention relates to a method for positioning a digging tool relative to a vessel comprising a hull, the digging tool being situated at one end of an elongated element, such as a suction pipe, a ladder or a similar element, said elongated element being pivotally connected to the hull by a hinge coupling whose center line extends substantially transversely to the vessel and comprising, between the digging tool and the hinge coupling, at least one hinge connection whose pivotal axis extends substantially parallel to the center line, whereby the elongated element is subdivided into at least two parts which are pivotable relative to each other and which enclose an angle relative to each other, the positioning of the digging tool being effected in that, via active control means, the angle between two parts of at least one hinge connection is changed in response to signals coming from measuring means.
  • the invention also relates to such vessel with digging tool.
  • Such vessel is known from DE-A 28 18 028, where a trailing suction dredge is employed having a suction pipe ending in a draghead, via which, by means of a dredge pump, a mixture of soil and water is sucked up from a bottom under water.
  • a passive swell compensator is utilized, which, upon a change of the distance between the draghead and the fastening point of the cable on the ship, more or less keeps the force in this cable.
  • the draghead-carrying part of the suction pipe is kept as much as possible at a constant angle to the bottom by the measuring means and the active control means.
  • the speed of the draghead is substantially equal to the speed of travel of the trailing suction dredge.
  • the draghead remaining at the same level, will obtain an irregular speed, i.e. it will move faster or slower than the average speed or speed of travel of the trailing suction dredge, depending on the vertical movement of the trailing suction dredge.
  • the suction pipe may be of articulated design and at seaway, the vessel may travel with an upwardly bent suction pipe. Should the suction pipe be inclined to get stuck, the bend may rise, so that the pressure forces referred to earlier will not occur.
  • a vessel used for such method may also be a cutter suction dredge provided with a digging tool in the form of a cutter head or a cutter wheel, at the end of a ladder, which inclines forwards during operation. Controlled by cables, the digging tool, during operation, makes an even swivel movement in a horizontal plane, while a forward movement is controlled by, for instance, a spud anchor with a spud anchor carriage.
  • the movements thereof will be transferred to the digging tool via the pivotable ladder, which involves the danger of damage to the equipment due to the fact that the digging tool is pressed into the ground or out of the excavated groove when the cutter suction dredge moves in vertical direction because of swell.
  • the displacement of the digging tool will deviate jerkily from the above-described, intended path, which will again result in an irregular and averagely very low dredging production.
  • the object of the invention is to remove as much as possible the influence of the vessel movements on the speed and regularity at which the digging tool moves during travel of the vessel and thus to increase the efficiency of the dredging operations.
  • this object is realized if, starting from a situation in which vessel, elongated element and digging tool all move at the same speed in direction of travel, during an externally caused change of the speed at which the vessel moves in direction of travel, by changing the angle between two parts of at least one hinge connection, said at least one hinge connection is actively controlled to move through swiveling in such a manner that a deceleration or acceleration is thereby effected in direction of travel such that the speed of displacement of the digging tool in direction of travel remains unchanged relative to said starting situation.
  • the level at which said hinge connection is located can vary, which fact is used for giving that hinge connection such a horizontal acceleration or deceleration, through active bending or stretching of the articulated, elongated element, that a horizontal deceleration or acceleration of the vessel, which can be measured and is caused by swell, can thereby be compensated, so that the hinge connection moves at a controlled horizontal speed relative to the bottom to be processed and the digging tool moves along the desired path at the desired speed, as a result of which any danger of damage to the dredging equipment, caused-by the digging tool being pressed into the ground, is of course eliminated as well.
  • the speed at which the digging tool moves can be taken, which can be compared with the desired speed of displacement.
  • the change of the speed of displacement of the vessel be measured in the direction of travel, from which measuring result a control signal is calculated for the degree to which the angle between two parts of at least one hinge connection is to be changed for keeping the speed of displacement of the digging tool in the direction of travel constant.
  • the desired acceleration or deceleration can be realized with a smaller change of the angle than in the case where parts of the hinge connection substantially extend in the same direction at a fairly obtuse angle.
  • the angle between two parts at at least one hinge connection, in the starting situation is in the order of 90°.
  • the invention also relates to a vessel comprising a hull and an elongated element such as a suction pipe, a ladder or similar element, carrying a digging tool at one end thereof, which elongated element is pivotally connected to the hull by a hinge coupling whose center line extends substantially transversely to the vessel and is provided, between the digging tool and the hinge coupling, with at least one hinge connection whose pivotal axis extends substantially parallel to the center line, whereby the elongated element is subdivided into at least two parts which are pivotable relative to each other and which enclose an angle relative to each other, there being present active control means for changing the angle between two parts of at least one hinge connection and measuring means for generating signals for activating the active control means, while in accordance with the invention, the measuring means are adapted to measure a change of speed in the direction of travel and are preferably located on the hull of the vessel.
  • the measuring means are adapted to measure a change of speed in the direction of travel and are preferably located on the
  • the elongated element is preferably provided with a part which inclines forwards, viewed in direction of travel, and a part pivotally connected thereto which inclines rearwards, viewed in direction of travel.
  • the active control means can act on various locations, for instance on the part of the elongated element which is pivotally connected to the hull, or to the hinge coupling between that part and the hull.
  • the active control means on one side act on or adjacent the hinge connection located closest to the digging tool, and on the other side act on a part fixedly connected to the vessel or a part of the elongated element connected to the hull by the hinge coupling. In this manner, an extremely direct and hence efficient, active control is possible.
  • the active control means may be provided with an actively controllable hydraulic cylinder engaging the elongated element on or adjacent the hinge connection located closest to the digging tool. Because the actively controllable hinge connection can move along specific paths only, due to its arrangement in the articulated, elongated element, and is subject to gravity, due to its floating arrangement between the vessel and the digging tool, means that are only capable of imposing an upward displacement may also be opted for.
  • active control means may be opted for, provided with an actively controllable winch with a cable of which one end engages the elongated element at or adjacent the hinge connection located closest to the digging tool.
  • controlled displacement of the hinge connection is effected by hauling in or veering out the winch cable.
  • the elongated element be a suction pipe which, as digging tool, carries a draghead, while during operation, the part of the suction pipe which connects to the draghead inclines rearwards, viewed in direction of travel, and the part of the suction pipe which pivotally connects to said rearwardly inclining part inclines substantially forwards.
  • the vessel is a cutter suction dredge
  • the elongated element is a ladder which, as digging tool, carries a cutter head or cutter wheel, while during use, the part of the ladder which connects to the cutter head or the cutter wheel inclines forwards, viewed in direction of travel, and the part of the ladder which pivotally connects to said forwardly inclined part inclines substantially rearwards.
  • first hinge connection and a second hinge connection spaced from said first hinge connection, whereby the elongated element is subdivided into a first, a second and a third part, which parts are pivotable relative to each other, the first part being connected, by the hinge coupling, to the hull and, by the first hinge connection, to the second part forming an intermediate part, and coupled by the second hinge connection to the third part, which further carries the digging tool.
  • a hinge connection in a suction pipe can be realized in a simple yet effective manner if in accordance with a further embodiment of the invention, there are provided two 90° bends, each having at least one end face, an end face of one bend being pivotally connected, fasewise, to an end face of the other bend.
  • an intermediate part can readily be formed by fixedly connecting a first pair of bends to a second pair of bends.
  • Fig. 1 shows a trailing suction dredge 1 having a hull 2 to which a first end of a first suction pipe part 4 is pivotally connected by means of a hinge coupling 3.
  • the second end of the first suction pipe part 4 is pivotally connected, by a hinge connection 5, to a first end of a second suction pipe part 6 whose other end carries a draghead 7 contacting a bottom 8 under water, the water surface of which is designated by reference numeral 9.
  • a well-known, passive swell compensator 10 Positioned on the afterdeck of the trailing suction dredge 1 is a well-known, passive swell compensator 10 having a trestle 11 which supports a winch 12 with a cable 13.
  • the free end of the cable 13 is connected to the draghead 7 or to the second suction pipe part 6 in the proximity thereof.
  • the winch 12 is designed so that it causes the draghead 7 to press on the bottom 8 with a constant force.
  • an active displacement compensator 14 Positioned on the foredeck of the trailing suction dredge 1 is an active displacement compensator 14 provided with a trestle 15 supporting an active compensation unit 16, whose first part is attached to the trestle 15 and whose second part, actively displaceable relative to the first part, is attached to one end of a cable 17 whose other end is connected to the suction pipe construction at or adjacent the hinge connection 5.
  • Said active compensation unit 16 can, for instance, be a piston-cylinder unit or a winch.
  • the passive swell compensator 10 will maintain the desired contact between the bottom 8 and the draghead 7 while changing the incline of the second suction pipe part 6.
  • the acceleration of hinge coupling 3 in the direction of travel is determined and transmitted to a calculating unit, not shown either, which determines the distance through which the draghead 7, as a result of that acceleration, would move additionally in the direction of travel and which, on the basis thereof, controls the active displacement compensator 14 in such a manner that it causes the hinge connection 5 to swivel rearwards through such an angle that the draghead 7 is not subjected to an additional displacement and hence keeps moving at a constant or substantially constant speed. If the hinge coupling 3 lowers relative to the bottom 8, which would prompt the draghead 7 to decelerate, this is compensated by causing the hinge connection 5 to swivel forwards through the angle required therefor.
  • trailing suction dredge which are usually present and well-known per se, are not shown.
  • a suction pump and hoisting trestles with winches and cables for hauling the suction pipe parts on board can be mentioned.
  • the trailing suction dredge may comprise a hold with bottom discharge flaps, the sucked-up dredging material being dumped into the hold, after which the heavier material can settle and the excess transport water can flow off overboard.
  • parts which are usually present but which are not necessary for the explanation of the invention have been left out.
  • Fig. 2 shows a trailing suction dredge 21 having a hull 22 to which a three-part suction pipe is pivotally attached by means of a hinge coupling 23 and which is composed of a first suction pipe part 24, a second suction pipe part 25 and a third suction pipe part 26, the first and second suction pipe parts being coupled via a first hinge connection 27 and the second and third suction pipe parts-being coupled by a second hinge connection 28.
  • a draghead 29 is hinged to the third suction pipe part 27 and, via a cable 30, to a passive swell compensator 31.
  • first suction pipe part 24 is kept at a substantially constant angle to the trailing suction dredge 21 by suspending the first hinge connection 27 from a trestle 33 via a cable 32.
  • the second hinge connection 28 is connected, via a cable 34, to an active displacement compensator 35. Because the first suction pipe part 24 maintains a substantially equal position relative to the hinge coupling 23 during swell, the displacement compensation which can be realized by the first hinge connection 27, the second suction pipe part 25, the second hinge connection 28 and the third suction pipe part 26, is in fact comparable with the displacement compensation as realized by the hinge coupling 3, the first suction pipe part 4, the hinge connection 5 and the second suction pipe part 6 of the trailing suction dredge 1 according to Fig. 1 as described hereinabove.
  • the suction pipe construction according to Fig. 2 is particularly preferred if the dredging operations are carried out in deep water.
  • Fig. 3 shows a trailing suction dredge having a three-part suction pipe which is substantially identical to that of Fig. 2; hence, similar parts are designated by the same reference numerals.
  • Fig. 3 differs in its construction of the active displacement compensator, here referred to by reference numeral 36 and consisting of a piston-cylinder unit which is pivotally coupled to the first suction pipe part 24 on one side and to the second hinge connection 28 on the other. From the foregoing, it will be understood that in this embodiment, during swell, the desired compensation is effected through extension or retraction of the piston-cylinder unit 36.
  • Fig. 4 shows, in top plan view, a possible embodiment of the three-part suction pipe in Fig. 3 in an extended position.
  • Fig. 4 demonstrates that the two ends of both the first suction pipe part 24 and the second suction pipe part 25 end in 90° bends, albeit that the bends in the first suction pipe part 24 are oppositely directed and the bends in the second suction pipe part 25 are oriented in the same direction.
  • the upper end of the third suction pipe part 26, pivotally carrying the draghead 29 at its lower end, ends in such bend as well, which bend, like the other bends, may be formed by attaching a 90° bend to a straight pipe part.
  • the hinge connections 27 and 28 and the hinge coupling 23 can be constructed as line hinges in a relatively simple manner.
  • Fig. 5 shows a cutter suction dredge 41 with a hull 42 to which a first ladder part 44 is pivotally attached via a hinge coupling 43, which ladder part 44 is further connected, via a hinge connection 45, to a second ladder part 46 carrying a cutter head 47 at its end.
  • the digging depth of the cutter head 47 relative to the hull 42 is determined by a cable 48 coming from a winch 50 arranged in a trestle 49.
  • the position of the cutter head 47 may also be determined by a passive swell compensator and a support plate pressing onto the bottom behind the cutter head.
  • the cutter head 47 further comprises threads extending above and below the plane of the drawing and capable of causing the cutter head 47 to make a uniform horizontal swivel movement.
  • the forward movement of the cutter head 47 is controlled by a spud anchor 51 and a spud anchor carriage 52, said spud anchor carriage 52 being capable of swiveling around the spud anchor and shifting relative to the hull
  • the second ladder part 46 is connected to the hull 42 so as to be directly pivotable, so that, during swell, the cutter head 47 is pulled back relative to its set position when the hinge coupling 43 is moved up and is pushed forwards when it is moved down.
  • the second ladder part 46 is coupled to the hull 42 via the first ladder part so as to be double-pivotable and an active displacement compensator in the form of a piston-cylinder unit 53 acts on the hinge connection 45 between the first and the second ladder part. In this manner, a threatening displacement of the cutter head 47 can be compensated in the above-described manner through extension or retraction of the piston-cylinder unit 53.
  • a second cable may be provided for realizing the displacement in a controlled and less gravity-dependent manner by having the second cable engage from a trestle which, relative to the trestle of the first cable, is located on the other side of the hinge connection.
  • the active compensation of the positional change of the parts of the elongated element relative to each other may also be directly effected by a motor.
  • more than two hinge connections may be present and more than one hinge connection may be actively controlled with mutual coordination for the desired displacement compensation.
  • the hinge coupling according to Fig. 4 is exclusively intended as an example; any other hinge connection may likewise be applied.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
EP00201049A 1999-03-22 2000-03-22 Verfahren zum Positionieren eines Ausgrabungswerkzeugs in Bezug auf ein Schiff, und Schiff mit einem Ausgrabungswerkzeug Withdrawn EP1039041A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1011629A NL1011629C2 (nl) 1999-03-22 1999-03-22 Werkwijze voor het positioneren van een graafgereedschap ten opzichte van een vaartuig alsmede een vaartuig met graafgereedschap.
NL1011629 1999-03-22

Publications (1)

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EP1039041A1 true EP1039041A1 (de) 2000-09-27

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016112A3 (nl) * 2004-07-06 2006-03-07 Dredging Int Inrichting en werkwijze voor het verplaatsen van bodemmateriaal onder water.
NL2001473C2 (nl) * 2008-04-11 2009-10-13 Ihc Holland Ie Bv Inrichting, systeem en werkwijze voor het verhogen van de werkbaarheid.
EP2626473A1 (de) * 2012-02-09 2013-08-14 Ondernemingen Jan De Nul, naamloze vennootchap Verfahren zur Reduzierung der Übertragung von durch einem Schneidkopf hervorgerufenen Vibrationen an einen Schneidsaugbagger sowie Schneidsaugbagger zur Anwendung des Verfahrens
EP2639359A1 (de) * 2012-03-16 2013-09-18 Ondernemingen Jan De Nul, naamloze vennootschap Saugbaggergerät und Verfahren zum Baggern oder Abbau mit solch einem Gerät
WO2015050445A3 (en) * 2013-10-01 2015-06-25 Baggermaatschappij Boskalis B.V. Trailing dredging vessel with a dredging pipe
NL2012205C2 (en) * 2014-02-05 2015-08-06 Ihc Holland Ie Bv Extended suction tube.

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1107675A (fr) * 1954-06-24 1956-01-04 Bretagne Atel Chantiers Dispositif de liaison à une drague d'une élinde rigide
US3734564A (en) * 1970-04-27 1973-05-22 Mckay C Endless bucket dredge with articulated ladder and swell compensator
US3826023A (en) * 1972-01-28 1974-07-30 Koning J De Wave motion compensating assembly for suction dredger
DE2413738A1 (de) * 1973-03-23 1974-10-03 Billiton Research Bv Vorrichtung zum einstellen der arbeitstiefe eines unterwasser-baggerelements
DE2818028A1 (de) * 1977-04-28 1978-11-09 Bos Kalis Westminster Verfahren und vorrichtung zur steuerung der position des saugrohres eines schwimmbaggers
EP0009516A1 (de) * 1978-09-29 1980-04-16 Ballast-Nedam Groep N.V. Verfahren und Vorrichtung zum Halten von Geräten auf einer Höhe unter einer Wasseroberfläche
NL7900595A (nl) * 1979-01-25 1980-07-29 Ihc Smit B V Sleepzuiger met zuigbuis.
NL7901450A (nl) * 1979-02-23 1980-08-26 Reba Bv Zelfinstellende zuigkop.
NL8101895A (nl) * 1981-04-16 1982-11-16 Hollandsch Aannemersbedrijf Za Werkwijze voor het verticaal instellen van een sleepkop van een sleephopperzuiger en inriching voor het uitvoeren van de werkwijze.
JPS5938432A (ja) * 1982-08-27 1984-03-02 Mitsubishi Heavy Ind Ltd ドラグヘツド深度表示装置
JPS60123635A (ja) * 1983-12-06 1985-07-02 Nippon Kokan Kk <Nkk> カツタサクシヨンドレツジヤ
JPS61151335A (ja) * 1984-12-24 1986-07-10 Kawanami:Kk 深部浚渫装置

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1107675A (fr) * 1954-06-24 1956-01-04 Bretagne Atel Chantiers Dispositif de liaison à une drague d'une élinde rigide
US3734564A (en) * 1970-04-27 1973-05-22 Mckay C Endless bucket dredge with articulated ladder and swell compensator
US3826023A (en) * 1972-01-28 1974-07-30 Koning J De Wave motion compensating assembly for suction dredger
DE2413738A1 (de) * 1973-03-23 1974-10-03 Billiton Research Bv Vorrichtung zum einstellen der arbeitstiefe eines unterwasser-baggerelements
DE2818028A1 (de) * 1977-04-28 1978-11-09 Bos Kalis Westminster Verfahren und vorrichtung zur steuerung der position des saugrohres eines schwimmbaggers
EP0009516A1 (de) * 1978-09-29 1980-04-16 Ballast-Nedam Groep N.V. Verfahren und Vorrichtung zum Halten von Geräten auf einer Höhe unter einer Wasseroberfläche
NL7900595A (nl) * 1979-01-25 1980-07-29 Ihc Smit B V Sleepzuiger met zuigbuis.
NL7901450A (nl) * 1979-02-23 1980-08-26 Reba Bv Zelfinstellende zuigkop.
NL8101895A (nl) * 1981-04-16 1982-11-16 Hollandsch Aannemersbedrijf Za Werkwijze voor het verticaal instellen van een sleepkop van een sleephopperzuiger en inriching voor het uitvoeren van de werkwijze.
JPS5938432A (ja) * 1982-08-27 1984-03-02 Mitsubishi Heavy Ind Ltd ドラグヘツド深度表示装置
JPS60123635A (ja) * 1983-12-06 1985-07-02 Nippon Kokan Kk <Nkk> カツタサクシヨンドレツジヤ
JPS61151335A (ja) * 1984-12-24 1986-07-10 Kawanami:Kk 深部浚渫装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 140 (M - 305) 29 June 1984 (1984-06-29) *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 282 (M - 428) 9 November 1985 (1985-11-09) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 353 (M - 539) 28 November 1986 (1986-11-28) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016112A3 (nl) * 2004-07-06 2006-03-07 Dredging Int Inrichting en werkwijze voor het verplaatsen van bodemmateriaal onder water.
NL2001473C2 (nl) * 2008-04-11 2009-10-13 Ihc Holland Ie Bv Inrichting, systeem en werkwijze voor het verhogen van de werkbaarheid.
EP2626473A1 (de) * 2012-02-09 2013-08-14 Ondernemingen Jan De Nul, naamloze vennootchap Verfahren zur Reduzierung der Übertragung von durch einem Schneidkopf hervorgerufenen Vibrationen an einen Schneidsaugbagger sowie Schneidsaugbagger zur Anwendung des Verfahrens
EP2639359A1 (de) * 2012-03-16 2013-09-18 Ondernemingen Jan De Nul, naamloze vennootschap Saugbaggergerät und Verfahren zum Baggern oder Abbau mit solch einem Gerät
WO2015050445A3 (en) * 2013-10-01 2015-06-25 Baggermaatschappij Boskalis B.V. Trailing dredging vessel with a dredging pipe
NL2012205C2 (en) * 2014-02-05 2015-08-06 Ihc Holland Ie Bv Extended suction tube.
WO2015119496A1 (en) 2014-02-05 2015-08-13 Ihc Holland Ie B.V. Extended suction tube for a hopper dredger

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