EP0548707A1 - Méthode et dispositif pour augmenter la profondeur des cours d'eau - Google Patents

Méthode et dispositif pour augmenter la profondeur des cours d'eau Download PDF

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Publication number
EP0548707A1
EP0548707A1 EP92121125A EP92121125A EP0548707A1 EP 0548707 A1 EP0548707 A1 EP 0548707A1 EP 92121125 A EP92121125 A EP 92121125A EP 92121125 A EP92121125 A EP 92121125A EP 0548707 A1 EP0548707 A1 EP 0548707A1
Authority
EP
European Patent Office
Prior art keywords
pressure
water
jet
suction
nozzles
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.)
Granted
Application number
EP92121125A
Other languages
German (de)
English (en)
Other versions
EP0548707B1 (fr
Inventor
Siegbert Dipl.-Ing. Sacklowski
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.)
Anton Muesing & Co KG GmbH
Original Assignee
Anton Muesing & Co KG GmbH
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 Anton Muesing & Co KG GmbH filed Critical Anton Muesing & Co KG GmbH
Publication of EP0548707A1 publication Critical patent/EP0548707A1/fr
Application granted granted Critical
Publication of EP0548707B1 publication Critical patent/EP0548707B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • E02F3/9243—Passive suction heads with no mechanical cutting means
    • E02F3/925—Passive suction heads with no mechanical cutting means with 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

  • the invention relates to a method for increasing the water depth of a body of water, in which the base material of the bottom of the body of water is removed or removed, preferably whirled up and suctioned off.
  • the invention further relates to a device for increasing the water depth of a body of water, which has a device that can act on the base material of the body of water for the removal or removal of base material, preferably a whirling and / or suction device, preferably for carrying out the aforementioned method.
  • Such a device works particularly well in relatively softer waters, for example as found on the North Sea coast, e.g. is about removing mud, mud or other sludge deposits in order to increase the water depth.
  • the invention is based on the object of demonstrating a method and a device of the type mentioned at the outset, which enables the water depth of a body of water to be increased even in the case of a relatively hard bottom of the body of water.
  • the object is achieved in that the resistive base material is weakened.
  • relatively hard water base material which resists the conventional methods and devices, is thus advantageously pre-processed and thereby weakened.
  • Such a weakening is brought about according to a development of the invention in that the base material is cut or cut.
  • the weakening according to the invention preferably the cutting or cutting of the material, is carried out specifically in the method according to the invention. This enables the further use of the otherwise known methods and devices of the type mentioned at the beginning. Resisting material is only weakened to the extent that the conventional methods are otherwise applicable.
  • a next development of the invention for which independent protection is also claimed, provides that at least one high-pressure jet of a blasting medium is used to cut the resistive base material. This enables contactless weakening of the base material quickly, effectively and relatively inexpensively.
  • Water is preferably used as the blasting medium, which makes the process even more cost-effective.
  • a water high-pressure jet can be generated in a simple manner with conventional high-pressure pumps known per se, for example for cleaning purposes.
  • a preferred embodiment of the method provides that the water is subjected to a high pressure of about 10-200 MPa (100-2000 atü), preferably about 25 MPa (250 atü). With such a high pressure, the clay base, and possibly also the stone base, can be weakened with the method according to the invention in such a way that further removal can be carried out using the conventional methods.
  • a further development of the method according to the invention provides that the high-pressure jet is moved relative to the bottom of the body of water, so that the bottom of the body of water can be pre-processed over a large area.
  • the high-pressure jet is shaped by means of a high-pressure nozzle, which is positioned or guided as close as possible to the base material to be weakened, preferably at most about 10 cm.
  • the method according to the invention can be carried out in a particularly simple and inexpensive manner according to a development of the method according to the invention combined with a conventional method, in particular with a whirling-up process and / or a suction process.
  • the base material is then weakened with an immediately combined or subsequent further removal or removal of the base material.
  • a device according to the invention for increasing the water depth of a body of water which has a device for removing or removing base material, preferably a whirling and / or suction device, which can act on the base material of the body of water, is characterized in the solution according to the invention by a high-pressure jet device Formation of at least one high-pressure jet which can be directed against the bottom of the water, comprising at least one high-pressure pump and at least one high-pressure nozzle.
  • a resisting body of water can be weakened sufficiently, preferably within the scope of the method according to the invention, in order then to enable conventional removal of the water base material without any problems.
  • the high-pressure nozzle according to the invention is preferably arranged so that it can be lowered into the water.
  • this can be done, for example, in that the high-pressure nozzle is attached to an arm that can be lowered, preferably swiveled, to the bottom of the water is arranged, which can also include or guide the high pressure line at the same time due to the hollow design or other arrangement.
  • the device according to the invention is preferably part of a watercraft, so that a large area of water can be treated with the watercraft.
  • conventionally designed water vehicles essentially only have to be equipped with a high-pressure pump, a high-pressure line and one or more high-pressure nozzles for the conversion according to the invention. Such a conversion is therefore relatively simple and inexpensive to carry out with advantage.
  • a next development of the invention provides that the high-pressure nozzle can be lowered to just above the bottom of the water in order to achieve the lowest possible loss of power from the high-pressure jet during use.
  • a next development of the invention provides that the high-pressure nozzle is protected, for example, by being surrounded by mudguards, so that only the nozzle opening remains free for the nozzle jet to exit, while the nozzle itself is protected against mechanical damage which occurs when the nozzle is moved above the nozzle Reason could occur.
  • the device according to the invention has a group of high-pressure nozzles.
  • these are preferably movable relative to the base.
  • this movement can take place solely in that they are arranged on a movable watercraft.
  • additional mobility can also be provided, in which the nozzles also move relative to the watercraft or the device.
  • a group of high-pressure nozzles can be arranged in a row, which can be moved back and forth overall, preferably transversely to the longitudinal axis of a watercraft, so that a respective high-pressure nozzle describes a meandering path above the water bed when such a watercraft is moving, and resisting base material meanders accordingly. or cuts.
  • Another embodiment of the device according to the invention provides that a group of high-pressure nozzles is arranged in a circle and is arranged on this circular arc in the circle so as to be axially rotatable or pivotable.
  • the bottom of the water is very small, practically chopped up by the high-pressure jets, so that further removal of the weakened base material is easily possible using conventional methods .
  • the circularly arranged group of high-pressure nozzles which rotates and is generally moved forward by a watercraft, acts comparatively like a hand blender of a kitchen machine when it is used to grind harder pieces of fruit, vegetables or nuts, the device according to the invention having the advantage that this is done contact-free and smoothly using high-pressure jets.
  • a further development of the invention provides that the high-pressure jet device is combined with a swirling device and / or suction device or the high-pressure jet device is integrated in these other devices.
  • the high-pressure jet device according to the invention supports the conventional devices, which otherwise operate in a conventional, proven manner.
  • the high-pressure jet device is in the direction of travel of a watercraft preferably (somewhat) upstream of the conventional devices mentioned.
  • the suction device comprises a preferably rectangular suction opening, in front of which high-pressure nozzles, preferably approximately three to four high-pressure nozzles, are arranged in a row parallel to the front side of the suction opening.
  • the high-pressure nozzles use their high-pressure jets to break up or weaken the base to be extracted immediately in front of the suction opening.
  • the suction opening can, for example, have a width of approximately 1 m to 1.20 m and suck off base material along a correspondingly wide path.
  • Three to four high-pressure nozzles can be arranged at a distance of about 30 cm from one another in front of this suction opening.
  • the nozzle openings can be round or slit-shaped, e.g. with a diameter of 2.6 mm.
  • the angle of the high-pressure nozzle is adjustable in the longitudinal direction of the watercraft in relation to the vertical.
  • the high-pressure nozzle is preferably set at an angle of approximately 15 ° to the vertical in the direction of travel of the watercraft (obliquely). With such an inclination of the high-pressure nozzle in the direction of travel, experience has shown that the weakening effect of the base material is greatest.
  • the high-pressure jet then has a force component in the vertical but also a force component in the horizontal, so that a plow effect arises that the processed base material looks like plowed after the action of the high-pressure jet. If there are several high-pressure nozzles, these are preferably adjustable independently of one another.
  • an outer tubular jacket is arranged coaxially to the high-pressure nozzle, such that a jacket jet enveloping the high-pressure jet can emerge from the annular jacket space between the tubular jacket and the high-pressure nozzle.
  • the high-pressure jet is bundled or focused even better, so that even with a somewhat larger distance between the high-pressure nozzle and the ground to be processed, it is ensured that the high-pressure jet can still act on the base material with as much force as possible, i.e. the jet in the surrounding water does not diverge or swirl so quickly between the nozzle and the base.
  • the jacket jet there may be at least one opening in the tube jacket for the suction or the entry of ambient medium (ambient water). Only through the suction effect of the high-pressure jet does ambient medium then enter the intermediate space between the shells and a jacket jet is formed which, surrounded by the high-pressure jet, is entrained by this high-pressure jet and protects the high-pressure jet.
  • ambient medium ambient water
  • the jacket intermediate space can be acted upon with a jacket jet medium under pressure, preferably with approximately 0.6 MPa (6 atm) pressure.
  • a jacket jet around the high-pressure jet is then generated with its own pressure source.
  • the pressure preferably used in this case corresponds to the pressure which is used for the rinsing medium in the swirling or rinsing device which is generally present anyway, so that the space between the shells only has to be connected to the pressure source which is present anyway.
  • the nozzle opening of the high-pressure nozzle can generally be very small in diameter, ie generally has an order of magnitude of a few millimeters, it is provided that when the ambient medium is used as the high-pressure jet medium.
  • a device for cleaning the medium in the broadest sense a filter system in order to avoid jamming and damage to the nozzle and also to the high-pressure pump. This should also avoid maintenance intervals of the high-pressure device that are too short, so that the device according to the invention can also operate unexpectedly over a longer period of time.
  • the suction device includes a suction line 2 which can be pivoted against the water bed 1 and has a suction opening 3.
  • the flushing device includes a U-shaped flushing line 4 which can be pivoted against the bottom 1 of the water.
  • a flushing medium is passed through the flushing line under pressure and sprayed against the bottom of the water with nozzles in jet mode. These jet nozzles are arranged in series along the base line section of the U-bracket shape of the flush line 4.
  • FIG. 2 schematically shows a perspective view of a part of this base section of the flushing line 4.
  • the jet nozzles 5 are arranged along this section, through which the flushing medium is sprayed against the water bed 1.
  • FIG. 3 shows a cross section through the flushing line section 4 according to FIG. 2. From this illustration it can be seen even more clearly that the high-pressure nozzles 6 are arranged upstream of the jet nozzles 5 in the direction of travel.
  • the high-pressure nozzles 6 are also provided in this illustration of FIG. 3 with a protective cage 8 in order to avoid damage or contamination by the water bed 1.
  • a corresponding protective cage could also be provided for the jet nozzles 5, or the jet nozzles 5 could be included in this protective cage 8.
  • Fig. 4 shows the section pivotable into the water Suction line 2, at the free end of which there is the suction opening 3.
  • the direction of travel of the hopper excavator according to FIG. 1 is the direction indicated by arrow 9.
  • high-pressure nozzles 6 Upstream of the suction opening 3 in the direction of travel are high-pressure nozzles 6, which can essentially correspond to the high-pressure nozzles 6 on the flushing device according to FIGS. 2 and 3.
  • a hopper excavator according to FIG. 1 with a suction device and with a flushing device can have high-pressure nozzles 6 in front of the suction device and / or in front of the flushing device in order to weaken the basic material to be cleared off before suction and / or flushing.
  • high-pressure nozzles can be arranged in a position directly in front of the suction opening 3 or can also be advanced at a distance from it, that is to say relatively independently of the suction opening 3.
  • FIG. 5 shows the bottom view of the suction opening 3 according to FIG. 4. It can be seen that this suction opening 3 is protected with a grate 10 against the penetration of larger foreign bodies.
  • three high-pressure nozzles 6 can be arranged in a row in front of the suction opening 3, that is to say in the position near the suction opening according to FIG. 4. In the position 6 somewhat more distant from the suction opening 3 according to FIG. 4, the high-pressure nozzles could 6 can be accommodated in a separate housing, which can be moved or mounted, for example, independently of the mouth of the suction line 2 having the suction opening 3.
  • a housing 11 in question for accommodating three high-pressure nozzles 6 is shown in cross section in FIG. 6.
  • FIG. 7 shows a longitudinal section through the housing 11 and FIG. 8 shows a plan view of the housing 11, which is shown in part in a chiselled manner.
  • the section of FIG. 7 runs along the dash-dotted line shown in FIG. 8 with A to F. 6 runs along the dash-dotted line labeled VI-VI in FIG. 8.
  • the high-pressure nozzles 6 are not shown in detail. These high-pressure nozzles 6 can be arranged in the positions 6, in such a way that they protrude downward from the housing 11 as shown in FIG. 7.
  • the high-pressure nozzles 6 can be pivoted gimbally about orthogonal axes 13, 14 individually by adjusting the tensioning screws 12 accordingly.
  • the individual high-pressure nozzles 6 can be pivoted about the axes 14, which run transversely to the direction of travel 9 of the hopper excavator, so that the high-pressure nozzles 6 can in particular be set so that their nozzle openings point somewhat in the direction of travel to the bottom 1, preferably at an angle of approximately 15 ° to the vertical.
  • the effective spacing of the points of impact of the high-pressure jets on the base 1 from one another can be changed by pivoting about the axis 13.
  • FIG. 9 shows a longitudinal section of a high-pressure nozzle 6, as it could be arranged on the housing 11.
  • the high-pressure nozzle 6 can be connected to a high-pressure line 7 via a connection 15.
  • the high-pressure nozzle 6 has a nozzle mouth 16 which can be replaced, so that nozzle openings of different geometries and / or diameters can be used as required.
  • An outer tubular jacket 17 extends coaxially around the high-pressure nozzle 6 such that a jacket intermediate space 18, which surrounds the high-pressure nozzle 6 in a ring, remains between the tubular jacket 17 and the high-pressure nozzle 6.
  • Suction openings 19 are arranged laterally in the tubular jacket 17, so that ambient water can be sucked in through the inlet openings 19 into the jacket intermediate space 18 by the suction effect of the high-pressure jet, which emerges from the high-pressure nozzle 6, and is carried away by the high-pressure jet, such that the high-pressure jet is a jacket jet protectively surrounds.
  • the inlet openings 19 could also be closed and a pressure connection for connecting the jacket space 18 to a separate pressure line could be provided on the connection-side end face 20 of the tubular jacket 17.
  • the pressure for the pressure medium passed through the jacket space 18 is preferably chosen to be substantially lower than the pressure for the high-pressure jet from the high-pressure nozzle 6.
  • the pressure source for the jacket space 18, for example, is the pressure source which also corresponds to the jet nozzles 5 of the suction device 2 and 3 supplied.
  • FIGS. 10 and 11 show, once in a side view and once in a bottom view, the suction line mouths of a suction line 2, roughly corresponding to FIGS. 4 and 5.
  • the high-pressure nozzles 6 are arranged in a row in the direction of travel in front of the suction opening 3, in the exemplary embodiment according to FIG. 11 the high-pressure nozzles 6 are arranged on a circle in front of the suction opening 3.
  • the circular support 21 of the high-pressure nozzles 6 is rotatable or alternating about an essentially vertical axis 22, so that the high-pressure nozzles 6 move on a corresponding circular path or, when the traveling movement of the hopper excavator is superimposed, on cycloid-like paths. This movement of the high-pressure nozzles 6 results in particularly intensive comminution of the base material of the base 1, since the rotating high-pressure nozzles 6 achieve a mashing effect.

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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)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP19920121125 1991-12-24 1992-12-11 Méthode et dispositif pour augmenter la profondeur des cours d'eau Expired - Lifetime EP0548707B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4142942 1991-12-24
DE4142942 1991-12-24
DE19924226492 DE4226492A1 (de) 1991-12-24 1992-08-11 Verfahren und vorrichtung zum vergroessern der wassertiefe eines gewaessers
DE4226492 1992-08-11

Publications (2)

Publication Number Publication Date
EP0548707A1 true EP0548707A1 (fr) 1993-06-30
EP0548707B1 EP0548707B1 (fr) 1996-04-03

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EP19920121125 Expired - Lifetime EP0548707B1 (fr) 1991-12-24 1992-12-11 Méthode et dispositif pour augmenter la profondeur des cours d'eau

Country Status (4)

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EP (1) EP0548707B1 (fr)
DE (2) DE4226492A1 (fr)
DK (1) DK0548707T3 (fr)
ES (1) ES2086627T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995027832A1 (fr) * 1994-04-07 1995-10-19 Hollandsche Beton Groep N.V. Procede et navire de traitement d'un lit sous-marin
NL1005330C2 (nl) * 1997-02-20 1998-08-24 Dredging Int Werkwijze voor het maken van een geul onder de waterlijn en inrichting hiervoor.
WO1999035345A1 (fr) * 1998-01-09 1999-07-15 Barry Kevin Francis Patrick Jr Excavatrice et procede d'utilisation de l'appareil
GB2403974A (en) * 2003-07-08 2005-01-19 Onyx Uk Ltd Nozzle assembly for removal of aggregate, e.g. railway ballast
EP1609916A3 (fr) * 1997-07-17 2006-04-05 "Dredging International" Tête de draguage pour une drague suceuse à trémie entraînée et procédé de draguage utilisant cette tête de draguage.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738518C1 (de) * 1997-09-03 1999-02-04 Ralph Melkau Verfahren zur Beseitigung von Ablagerungen auf Gewässerböden
BE1020372A5 (nl) * 2012-01-16 2013-08-06 Baggerwerken Decloedt En Zoon Zuigkop voor een baggerschip en werkwijze voor het baggeren met behulp van zuigkop.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29195C (de) * R. STONE in New-York, V. St. A Hydraulischer Baggerapparat zur Beseitigung von Sandbänken und dergleichen
US2956354A (en) * 1956-06-14 1960-10-18 Charles W Varner Dredging apparatus
FR1399762A (fr) * 1964-04-03 1965-05-21 Grenobloise Etude Appl Perfectionnements aux élindes de dragues suceuses
US3572839A (en) * 1968-08-28 1971-03-30 Toa Kowan Kogyo Kk Process for excavation of hard underwater beds
EP0029469A1 (fr) * 1979-11-15 1981-06-03 Ballast-Nedam Groep N.V. Procédé de dragage et équipement de dragage
EP0075358A1 (fr) * 1981-09-17 1983-03-30 Ihc Holland N.V. Procédé pour aspirer de la terre ou de la vase par une drague suceuse à trémie et une drague suceuse pour la mise en oeuvre de ce procédé
DE4117441A1 (de) * 1991-05-28 1992-06-17 Muesing Anton Gmbh Co Kg Verfahren ud vorrichtung zur vergroesserung der wassertiefe eines gewaessers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29195C (de) * R. STONE in New-York, V. St. A Hydraulischer Baggerapparat zur Beseitigung von Sandbänken und dergleichen
US2956354A (en) * 1956-06-14 1960-10-18 Charles W Varner Dredging apparatus
FR1399762A (fr) * 1964-04-03 1965-05-21 Grenobloise Etude Appl Perfectionnements aux élindes de dragues suceuses
US3572839A (en) * 1968-08-28 1971-03-30 Toa Kowan Kogyo Kk Process for excavation of hard underwater beds
EP0029469A1 (fr) * 1979-11-15 1981-06-03 Ballast-Nedam Groep N.V. Procédé de dragage et équipement de dragage
EP0075358A1 (fr) * 1981-09-17 1983-03-30 Ihc Holland N.V. Procédé pour aspirer de la terre ou de la vase par une drague suceuse à trémie et une drague suceuse pour la mise en oeuvre de ce procédé
DE4117441A1 (de) * 1991-05-28 1992-06-17 Muesing Anton Gmbh Co Kg Verfahren ud vorrichtung zur vergroesserung der wassertiefe eines gewaessers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995027832A1 (fr) * 1994-04-07 1995-10-19 Hollandsche Beton Groep N.V. Procede et navire de traitement d'un lit sous-marin
NL9400551A (nl) * 1994-04-07 1995-11-01 Hollandsche Betongroep Nv Werkwijze alsmede vaartuig voor het behandelen van een waterbodem.
AU688485B2 (en) * 1994-04-07 1998-03-12 Van Oord N.V. Method and vessel for treating an underwater bed
US6874261B2 (en) 1994-04-07 2005-04-05 Van Oord N.V. Method for treating an underwater bed
NL1005330C2 (nl) * 1997-02-20 1998-08-24 Dredging Int Werkwijze voor het maken van een geul onder de waterlijn en inrichting hiervoor.
EP0860556A1 (fr) * 1997-02-20 1998-08-26 Dredging International N.V. Procédé et dispositif pour le dragage des tranchées au fond de plans d'eau
EP1609916A3 (fr) * 1997-07-17 2006-04-05 "Dredging International" Tête de draguage pour une drague suceuse à trémie entraînée et procédé de draguage utilisant cette tête de draguage.
WO1999035345A1 (fr) * 1998-01-09 1999-07-15 Barry Kevin Francis Patrick Jr Excavatrice et procede d'utilisation de l'appareil
GB2403974A (en) * 2003-07-08 2005-01-19 Onyx Uk Ltd Nozzle assembly for removal of aggregate, e.g. railway ballast

Also Published As

Publication number Publication date
EP0548707B1 (fr) 1996-04-03
DK0548707T3 (da) 1996-08-19
DE4226492A1 (de) 1993-07-01
DE59205905D1 (de) 1996-05-09
ES2086627T3 (es) 1996-07-01

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