EP0892116A1 - Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head - Google Patents

Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head Download PDF

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Publication number
EP0892116A1
EP0892116A1 EP98870161A EP98870161A EP0892116A1 EP 0892116 A1 EP0892116 A1 EP 0892116A1 EP 98870161 A EP98870161 A EP 98870161A EP 98870161 A EP98870161 A EP 98870161A EP 0892116 A1 EP0892116 A1 EP 0892116A1
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EP
European Patent Office
Prior art keywords
drag head
teeth
jet pipes
visor
series
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
EP98870161A
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German (de)
French (fr)
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EP0892116B1 (en
Inventor
Stefaan Vandycke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dredging International NV
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Dredging International NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dredging International NV filed Critical Dredging International NV
Priority to EP05016382A priority Critical patent/EP1609916B1/en
Publication of EP0892116A1 publication Critical patent/EP0892116A1/en
Application granted granted Critical
Publication of EP0892116B1 publication Critical patent/EP0892116B1/en
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
    • E02F3/92—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
    • 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
    • E02F5/108—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 suction-effect devices

Definitions

  • This invention relates to a drag head for a trailing suction hopper dredger which essentially consists of a structure connected to a suction pipe, with a visor rotating around an horizontal axis, in which a series of teeth are applied for breaking up the sand, which are fitted on a toothed beam extending perpendicularly with reference to the direction of motion of the drag head, and a series of jet pipes for injecting water under high pressure, extending parallel to said toothed beam and in front of these teeth, always when considering the direction of motion of the drag head.
  • a trailing suction hopper dredger consists of a structure connected to a suction pipe, which is open at the bottom side and is dragged over the ground during dredging.
  • the drag head itself consists of two parts: a cap which is directly connected to the suction pipe of the ship, and a visor which is hingingly connected to the cap by means of an horizontal axis.
  • a series of teeth 4 are applied on an horizontal beam in order to break up the ground.
  • Such a beam is known as a toothed beam.
  • a series of wear heel pieces are applied. These form the heel plate. In these wear heel pieces a number of nozzles are provided.
  • the sand to be dredged consists of piled up grains. By their own weight, these are pressed onto each other. This pressure is transferred between the grains by the mutual points of support, being the points of contact between the grains.
  • this equilibrium has to be disturbed. This may be achieved by using the jets: by feeding water under high pressure, the mutual pressure between the grains may be removed. By this, the force which keeps the grains on each other is removed, causing the grains to start moving. These grains try to reach another state of equilibrium, and this is called the fluidisation of the sand. Now, only this sand has yet to be sucked up, which may be achieved by the underpressure built up in the drag head.
  • the jets serve to loosen up the sand and that the suction force of the dredging pump serves for the transport of the loosened up sand.
  • Trailing hoppers which correspond to the above given description are known.
  • At least one second series of jet pipes is provided behind the above said teeth.
  • the above said second series of jet pipes is subdivided in jet pipes directed at the inside of the visor, more particularly at above said teeth, and in jet pipes which are directed vertically or substantially vertically downwards.
  • Figure 1 is a schematic side view of the dredge head according to the invention.
  • Figure 2 is, at a bigger scale, a perspective representation of the dredge head according to the invention.
  • Figure 3 schematically illustrates the operational depth of a drag head of the known type.
  • Figure 4 in the same way illustrates the possible operational depth of a drag head according to the invention.
  • the drag head for a trailing suction hopper dredger according to the invention is moved over the bottom in the direction of arrow P which is shown in figure 1.
  • the drag head according to the invention is found at the end of a suction pipe 1 which is equipped with a visor 2 consisting a.o. of side walls 3, a back wall 3', a top plate 4 with an arc-shaped section 5, which upon rotation of the visor 2 around its axis 6 remains in close contact with the sealing strip 7 belonging to the fixed parts which are fitted to the suction pipe.
  • a visor 2 consisting a.o. of side walls 3, a back wall 3', a top plate 4 with an arc-shaped section 5, which upon rotation of the visor 2 around its axis 6 remains in close contact with the sealing strip 7 belonging to the fixed parts which are fitted to the suction pipe.
  • a second series of jet pipes is now provided. These jet pipes are subdivided into a first series of jet pipes 12 which are directed towards the teeth 10, and a second series of jet pipes 12' which are directed vertically or substantially vertically downwards.
  • the jets injected through jet pipes 12 are directed towards the inside of the visor.
  • the jet pipes 12' are aimed at fluidising the bottom better, i.e. deeper at the height of the back wall 3'.
  • the different jet pipes 12, 12' immediately link up with a water valve 11 which may be moved, and this according to a translation which occurs in a plane that runs parallel to the back wall 3' of the visor.
  • This water valve 11 is designed in the shape of a water chamber 13. In case of hydraulic operation, this is carried out from the bridge of the trailing suction hopper dredger.
  • the fitting of the water valve which is adjustable in the height direction, increases the efficiency of the new drag head, because the water gap may be optimally adjusted as a function of the soil conditions and totally independent from the penetration of the bottom by the visor.
  • the efficiency of the trailing suction hopper dredger is further increased by applying at the bottom of the side walls 3 of the visor, one or a series of several lateral knife-shaped wear strips 14. These wear strips are sufficiently thin to penetrate into the sand in order to realise the desired sealing, so that the ratio sand/water of the sucked off mixture is further optimised.
  • the drag head In order to prevent feed water from being fed along the relatively unproductive sides of the visor, the drag head has to be well sealed at these sites.
  • the side walls of the visor should well penetrate into the bottom.
  • the visor By the presence of thinly walled wear strips 14, the visor is laterally perfectly sealed, so that the required transport water is integrally sucked up at the back through the water gap and the agitated soil.
  • This new layout forms a second important feature of the invention.
  • a further improvement of the drag head should be seen in the presence at the back side of the drag head of the feet 15 hinging with respect to the visor, the useful surface of which, i.e. the base 15', is sufficiently great to guarantee a fixed support on the bottom.
  • the depth of the feet 15, which are mutually connected by a plate 17 (figure 2) By regulating the depth of the feet 15, which are mutually connected by a plate 17 (figure 2), the penetration of the visor and thus of the teeth into the soil is regulated. This allows to regulate the cutting thickness of the teeth and this independently from the water gap.
  • feet 15, with their widened bases 15' are rotatably fitted around hinge point 18. The rotation is effectuated by the action of the hydraulic cylinder 16, with hinge point 18 with respect to the feet 15 and hinge point 19 with respect to the visor.
  • the visor itself is lifted or lowered by the action of hydraulic cylinder 20.
  • the cylinder 20 is rigidly fastened with respect to the suction pipe 1 and is in 21 hingingly connected to fixed parts belonging to the structure of the visor, in order to lift or lower the back wall 3' thereof.

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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)
  • Jet Pumps And Other Pumps (AREA)
  • Earth Drilling (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Nozzles (AREA)
  • Manipulator (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Hydraulic Turbines (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Casting Devices For Molds (AREA)
  • Soil Working Implements (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Shovels (AREA)
  • Coating Apparatus (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

This invention concerns a drag head for a trailing suction hopper dredger which essentially consists of a structure connected to a suction pipe, with a visor (2) rotating around an horizontal axis (6), in which a series of teeth (10) are applied for breaking up the sand, which extend perpendicularly with respect to the direction of motion of the drag head, and a series of jet pipes (9) for injecting water under high pressure, extending parallel to said teeth and in front of these teeth, always when considering the direction of motion of the drag head, characterised in that behind above said teeth (10), always considered in the direction of motion of the drag head, at least one second series of jet pipes (12) is provided.

Description

This invention relates to a drag head for a trailing suction hopper dredger which essentially consists of a structure connected to a suction pipe, with a visor rotating around an horizontal axis, in which a series of teeth are applied for breaking up the sand, which are fitted on a toothed beam extending perpendicularly with reference to the direction of motion of the drag head, and a series of jet pipes for injecting water under high pressure, extending parallel to said toothed beam and in front of these teeth, always when considering the direction of motion of the drag head.
A trailing suction hopper dredger consists of a structure connected to a suction pipe, which is open at the bottom side and is dragged over the ground during dredging.
The drag head itself consists of two parts: a cap which is directly connected to the suction pipe of the ship, and a visor which is hingingly connected to the cap by means of an horizontal axis. In the visor a series of teeth 4 are applied on an horizontal beam in order to break up the ground. Such a beam is known as a toothed beam.
At the bottom side of the cap, at the height of the connection with the visor, a series of wear heel pieces are applied. These form the heel plate. In these wear heel pieces a number of nozzles are provided.
During dredging, the head is moved over the ground. In this way, the cap is resting by the heel plate onto the bottom. Because the visor can move independently from the cap, the latter is resting with the side and/or back wall on the bottom. Depending on the hardness of the bottom, these walls will more or less penetrate the bottom. By the suction action of the dredging pump at the suction pipe end, an underpressure will finally be built up in the drag head, which among others depends on the extent of sealing of this head. Through this, together with the water from the outside which has to be fed inevitably, an amount of sand will be sucked up. In this way, sand is dredged by means of the erosion action of the water.
The sand production is up to now increased by two additional elements:
  • a) Teeth: owing to the teeth present in the visor, a layer is peeled off the bottom at the passage of the head. In this way, the broken up earth may then be sucked up.
  • b) Jets: in the wear heel pieces one or more nozzles are to be found. Through these, at present, water is pumped with a pressure of approximately 10 bar. These allow to suck up extra sand, since:
    • The sand to be dredged consists of piled up grains. By their own weight, these are pressed onto each other. This pressure is transferred between the grains by the mutual points of support, being the points of contact between the grains.
    It is this pressure which ensures that the grains remain at rest in a certain way: the grains remain packed in a certain state of equilibrium.
    If it is desired to suck up this sand, this equilibrium has to be disturbed. This may be achieved by using the jets: by feeding water under high pressure, the mutual pressure between the grains may be removed. By this, the force which keeps the grains on each other is removed, causing the grains to start moving. These grains try to reach another state of equilibrium, and this is called the fluidisation of the sand. Now, only this sand has yet to be sucked up, which may be achieved by the underpressure built up in the drag head.
    In general it may thus be said that the jets serve to loosen up the sand and that the suction force of the dredging pump serves for the transport of the loosened up sand.
    Trailing hoppers which correspond to the above given description are known.
    It is the aim of the invention to design a drag head which thanks to a number of modifications and improvements shows an increased efficiency, thanks to among others an increased concentration of sand in the pumped up mixture, whereto means are provided to adjust the water gap independently from the cutting thickness.
    In order to allow this in accordance with the invention, behind the above said teeth, always with reference to the direction of motion of the drag head, at least one second series of jet pipes is provided.
    Always according to the invention, the above said second series of jet pipes is subdivided in jet pipes directed at the inside of the visor, more particularly at above said teeth, and in jet pipes which are directed vertically or substantially vertically downwards.
    Other details and advantages of the invention will appear from the following description of a drag head according to the invention. This description is exclusively given as an example and does not limit the invention. The reference numbers refer to the attached figures.
    Figure 1 is a schematic side view of the dredge head according to the invention.
    Figure 2 is, at a bigger scale, a perspective representation of the dredge head according to the invention.
    Figure 3 schematically illustrates the operational depth of a drag head of the known type.
    Figure 4 in the same way illustrates the possible operational depth of a drag head according to the invention.
    The drag head for a trailing suction hopper dredger according to the invention is moved over the bottom in the direction of arrow P which is shown in figure 1. The drag head according to the invention is found at the end of a suction pipe 1 which is equipped with a visor 2 consisting a.o. of side walls 3, a back wall 3', a top plate 4 with an arc-shaped section 5, which upon rotation of the visor 2 around its axis 6 remains in close contact with the sealing strip 7 belonging to the fixed parts which are fitted to the suction pipe. During dredging, indeed an underpressure is maintained within the visor, and it is actually a clear objective of the invention to increase the sand fraction of the dredged slurry. Through the heel plates 8 a number of jet pipes 9 pass, which inject water under high pressure. The heel plate 8 with jet pipes 9 applied at the front are currently used up to now. During the dragging of the drag head over the bottom, the injected jets will first loosen up the sand, which will subsequently be sucked up immediately. Simultaneously, the teeth 10, which are found behind the jet pipes 9, will break up the sand. (In this text, the terms "in front of" and "behind" shall be understood with reference to the direction of motion of the drag head). Also these teeth are found in the drag heads existing up to now.
    Behind these teeth 10, at the height of the water valve 11 closing down the visor at the back side, a second series of jet pipes is now provided. These jet pipes are subdivided into a first series of jet pipes 12 which are directed towards the teeth 10, and a second series of jet pipes 12' which are directed vertically or substantially vertically downwards. The jets injected through jet pipes 12 are directed towards the inside of the visor. The jet pipes 12' are aimed at fluidising the bottom better, i.e. deeper at the height of the back wall 3'.
    The presence of the jet pipes 12 and 12' has the following advantages:
  • a) The sand loosened up by the teeth 10 and the jet pipes 9 which was not yet sucked up is extra fluidised and may thus be sucked up better;
  • b) The breaking up in several stages by jet pipes 9 on the one hand, and jet pipes 12 and 12' on the other hand, increases the depth at which the sand is agitated and sucked up. This may be clearly ascertained by comparing the operational depth according to figure 3 with the operational depth according to figure 4.
  • c) An increase of the efficiency through the water gap. Whereas before, a mixture of sand/water only passed through the water gap by erosion, now the concentration of the mixture is increased by erosion and by the presence of fluidised sand as a result of the action of the jet pipes immediately in front of the water gap.
    • The advantages explained here are the immediate result of the switching on of the jet pipes 12, 12' immediately behind the teeth 10.
    The different jet pipes 12, 12' immediately link up with a water valve 11 which may be moved, and this according to a translation which occurs in a plane that runs parallel to the back wall 3' of the visor. This water valve 11 is designed in the shape of a water chamber 13. In case of hydraulic operation, this is carried out from the bridge of the trailing suction hopper dredger. The fitting of the water valve which is adjustable in the height direction, increases the efficiency of the new drag head, because the water gap may be optimally adjusted as a function of the soil conditions and totally independent from the penetration of the bottom by the visor.
    The efficiency of the trailing suction hopper dredger is further increased by applying at the bottom of the side walls 3 of the visor, one or a series of several lateral knife-shaped wear strips 14. These wear strips are sufficiently thin to penetrate into the sand in order to realise the desired sealing, so that the ratio sand/water of the sucked off mixture is further optimised.
    In order to prevent feed water from being fed along the relatively unproductive sides of the visor, the drag head has to be well sealed at these sites. The side walls of the visor should well penetrate into the bottom.
    By the presence of thinly walled wear strips 14, the visor is laterally perfectly sealed, so that the required transport water is integrally sucked up at the back through the water gap and the agitated soil. This new layout forms a second important feature of the invention.
    A further improvement of the drag head should be seen in the presence at the back side of the drag head of the feet 15 hinging with respect to the visor, the useful surface of which, i.e. the base 15', is sufficiently great to guarantee a fixed support on the bottom. By regulating the depth of the feet 15, which are mutually connected by a plate 17 (figure 2), the penetration of the visor and thus of the teeth into the soil is regulated. This allows to regulate the cutting thickness of the teeth and this independently from the water gap. In a possible embodiment, feet 15, with their widened bases 15', are rotatably fitted around hinge point 18. The rotation is effectuated by the action of the hydraulic cylinder 16, with hinge point 18 with respect to the feet 15 and hinge point 19 with respect to the visor. The visor itself is lifted or lowered by the action of hydraulic cylinder 20. The cylinder 20 is rigidly fastened with respect to the suction pipe 1 and is in 21 hingingly connected to fixed parts belonging to the structure of the visor, in order to lift or lower the back wall 3' thereof.
    In figure 2, one of the hydraulic cylinders, 22, which controls the water valve 11, is shown.
    By increasing the operational pressure of the water jets from 10 bars to 20 bars, a clearly better penetration of these water jets may be expected. This forms a further feature of the invention.
    By the combination of the different improvements to a drag head of the known type, as explained above, a surprising increase of the efficiency of the new drag head may be expected.
    The invention is not limited to the embodiment described herein, and modifications thereof might be applied in as much as they fall within the scope of the attached claims.

    Claims (5)

    1. Drag head for a trailing suction hopper dredger which essentially consists of a structure connected to a suction pipe, with a visor (2) rotating around an horizontal axis (6), in which a series of teeth (10) are applied for breaking up the sand, which extend perpendicularly with respect to the direction of motion of the drag head, and a series of jet pipes (9) for injecting water under high pressure, extending parallel to said teeth and in front of these teeth, always when considering the direction of motion of the drag head, characterised in that behind above said teeth (10), always considered in the direction of motion of the drag head, at least one second series of jet pipes (12) is provided.
    2. Drag head according to claim 1, characterised in that above said second series of jet pipes (12) is fitted on a water valve (11) in the shape of a water chamber (13) which is hydraulically moveable in a plane extending tangently or substantially tangently to the visor.
    3. Drag head according to claim 2, characterised in that above said second series of jet pipes (12) is subdivided into jet pipes (12) directed at the inside of the visor, more particularly to above said teeth, and in jet pipes (12') which are directed vertically of substantially vertically downwards.
    4. Drag head according to any of claims 1-3, characterised in that above said visor (2), together with above said suction pipe (1) is equipped with adjustable feet (15), the useful surface (15') of which is sufficiently great to get support on the bottom, whereto the visor, at the bottom of the side walls 3' is equipped with knife-shaped wear strips (14), which are sufficiently thin so as to penetrate into the bottom and to ensure the desired lateral sealing.
    5. Process for dredging with a trailing suction hopper dredger equipped with a drag head according to any one of claims 1-4, characterised in that the pressure in the jet pipes is increased to 20 bars.
    EP98870161A 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head Expired - Lifetime EP0892116B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    EP05016382A EP1609916B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    BE9700625A BE1011285A3 (en) 1997-07-17 1997-07-17 TOWING HEAD FOR A TOWING PISTON AND METHOD FOR DREDGING USING THIS TOWING HEAD.
    BE9700625 1997-07-17

    Related Child Applications (1)

    Application Number Title Priority Date Filing Date
    EP05016382A Division EP1609916B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head

    Publications (2)

    Publication Number Publication Date
    EP0892116A1 true EP0892116A1 (en) 1999-01-20
    EP0892116B1 EP0892116B1 (en) 2006-01-18

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    EP98870161A Expired - Lifetime EP0892116B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head
    EP05016382A Expired - Lifetime EP1609916B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head

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    Application Number Title Priority Date Filing Date
    EP05016382A Expired - Lifetime EP1609916B1 (en) 1997-07-17 1998-07-17 Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head

    Country Status (9)

    Country Link
    EP (2) EP0892116B1 (en)
    AT (1) ATE415524T1 (en)
    BE (1) BE1011285A3 (en)
    CY (1) CY1110897T1 (en)
    DE (2) DE69833248T2 (en)
    DK (2) DK0892116T3 (en)
    ES (2) ES2256926T3 (en)
    HK (1) HK1090398A1 (en)
    PT (2) PT892116E (en)

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    DE19960361A1 (en) * 1999-12-14 2001-06-21 Krupp Foerdertechnik Gmbh Drag head for suction excavators
    NL1020521C2 (en) * 2002-05-02 2003-11-04 Bos & Kalis Baggermaatsch Suction dredger, includes water jet device for breaking up sediment and support surface on dredger head for suction pipe
    BE1015911A3 (en) * 2004-02-19 2005-11-08 Dredeco Pty Ltd Draghead HOPPER AND VACUUM.
    BE1016085A5 (en) * 2004-06-23 2006-02-07 Dredging Int Drag head for trailing suction dredger, includes rotary cutting device comprising driven rotary body with cutting head
    EP1653010A1 (en) * 2004-10-26 2006-05-03 Ihc Holland N.V. Method for performing an underwater dredging operation, and dredging installation
    WO2009068412A1 (en) * 2007-11-29 2009-06-04 Dredging International Drag head of a trailing suction hopper dredger and method for dredging using this drag head
    WO2010066757A1 (en) * 2008-12-12 2010-06-17 Dredging International N.V. Drag head for a trailing suction hopper dredger and method for dredging using this drag head
    WO2010079193A1 (en) 2009-01-10 2010-07-15 Dredging International N.V. Excavating device for excavating ground under water, and method for excavating ground
    WO2012104314A1 (en) * 2011-02-02 2012-08-09 Baggerwerken Decloedt En Zoon Suction head for a dredging vessel and method for dredging using said suction head
    WO2013108131A1 (en) 2012-01-16 2013-07-25 Baggerwerken Decloedt En Zoon Suction head for a dredging vessel and the related method
    BE1020438A4 (en) * 2012-05-21 2013-10-01 Baggerwerken Decloedt En Zoon SUCTION HEAD FOR A DREDGING SHIP AND METHOD FOR DRAGGING USING THIS SUCTION HEAD.
    WO2013174932A1 (en) 2012-05-25 2013-11-28 Baggerwerken Decloedt En Zoon Dredging head of a trailing hopper dredger and method for dredging by means of said dredging head
    NL2011961C2 (en) * 2013-12-13 2015-06-16 Ihc Holland Ie Bv Modular visor for a drag head.
    CN104818739A (en) * 2015-05-05 2015-08-05 明光市留香泵业有限公司 Suction shield head for seabed sand suction operation
    BE1022377B1 (en) * 2015-02-18 2016-03-18 Baggerwerken Decloedt En Zoon N.V. Suction head of a dredger and method for dredging using this suction head
    CN106193157A (en) * 2016-08-31 2016-12-07 中交烟台环保疏浚有限公司 Trailing suction hopper dredger drag head
    CN106836342A (en) * 2017-01-24 2017-06-13 黄河水利委员会黄河水利科学研究院 One kind break ground jet suction formula suction head
    CN108265767A (en) * 2018-04-04 2018-07-10 长江南京航道工程局 Dredger crushes drag head device
    CN108331060A (en) * 2018-04-04 2018-07-27 长江南京航道工程局 Dredger water knife drag head device
    CN108396807A (en) * 2018-04-04 2018-08-14 长江南京航道工程局 dredger hydrofoil drag head device
    CN108824532A (en) * 2018-07-05 2018-11-16 长江南京航道工程局 A kind of free floating suction dredge(r) drag head at automatic adjustment rotation angle
    WO2018236213A2 (en) 2017-06-22 2018-12-27 Baggermaatschappij Boskalis B.V. Trailing suction hopper dredger having a recycle system for effluent and method for suction dredging
    CN109629622A (en) * 2019-01-10 2019-04-16 中交上海航道局有限公司 A kind of drag suction dredger drag head
    CN109914505A (en) * 2019-04-12 2019-06-21 中交天航滨海环保浚航工程有限公司 Trailing suction hopper dredger drag head structure with removable grid
    CN113638457A (en) * 2021-07-28 2021-11-12 唐丽铭 Drag head for drag suction dredger
    CN114658053A (en) * 2022-03-28 2022-06-24 中港疏浚有限公司 Intelligent adjustable mud dredging drag head

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    NL1020521C2 (en) * 2002-05-02 2003-11-04 Bos & Kalis Baggermaatsch Suction dredger, includes water jet device for breaking up sediment and support surface on dredger head for suction pipe
    BE1015911A3 (en) * 2004-02-19 2005-11-08 Dredeco Pty Ltd Draghead HOPPER AND VACUUM.
    BE1016085A5 (en) * 2004-06-23 2006-02-07 Dredging Int Drag head for trailing suction dredger, includes rotary cutting device comprising driven rotary body with cutting head
    CN1766241B (en) * 2004-10-26 2011-09-14 Ihc荷兰公司 Underwater dredging application method and dredging apparatus
    EP1653010A1 (en) * 2004-10-26 2006-05-03 Ihc Holland N.V. Method for performing an underwater dredging operation, and dredging installation
    AU2008328990B2 (en) * 2007-11-29 2015-03-26 Dredging International Drag head of a trailing suction hopper dredger and method for dredging using this drag head
    WO2009068412A1 (en) * 2007-11-29 2009-06-04 Dredging International Drag head of a trailing suction hopper dredger and method for dredging using this drag head
    JP2011504975A (en) * 2007-11-29 2011-02-17 ドレッジング・インターナショナル・ナムローゼ・フエンノートシャップ Trailing suction hopper dredger drag head and method of dredging using the drag head
    BE1017861A3 (en) * 2007-11-29 2009-09-01 Dredging Int Towing head of a towing hopper and method for dredging using this towing head.
    US8286375B2 (en) 2007-11-29 2012-10-16 Dredging International N.V. Drag head of a trailing suction hopper dredger and method for dredging using this drag head
    BE1018378A3 (en) * 2008-12-12 2010-09-07 Dredging Int Towing head for a towing hopper and method for dredging using this towing head.
    JP2012511644A (en) * 2008-12-12 2012-05-24 ドレッジング・インターナショナル・ナムローゼ・フエンノートシャップ Drag head for trailing suction hopper dredger and method of dredging using the drag head
    WO2010066757A1 (en) * 2008-12-12 2010-06-17 Dredging International N.V. Drag head for a trailing suction hopper dredger and method for dredging using this drag head
    US9476181B2 (en) 2008-12-12 2016-10-25 Dredging International N.V. Drag head for a trailing suction hopper dredger and method for dredging using this drag head
    WO2010079193A1 (en) 2009-01-10 2010-07-15 Dredging International N.V. Excavating device for excavating ground under water, and method for excavating ground
    BE1019788A4 (en) * 2011-02-02 2012-12-04 Baggerwerken Decloedt & Zn N V SUCTION HEAD FOR A DREDGING SHIP AND METHOD FOR DRAGGING USING THIS SUCTION HEAD.
    AU2012213492B2 (en) * 2011-02-02 2017-03-16 Baggerwerken Decloedt En Zoon Suction head for a dredging vessel and method for dredging using said suction head
    WO2012104314A1 (en) * 2011-02-02 2012-08-09 Baggerwerken Decloedt En Zoon Suction head for a dredging vessel and method for dredging using said suction head
    WO2013108131A1 (en) 2012-01-16 2013-07-25 Baggerwerken Decloedt En Zoon Suction head for a dredging vessel and the related method
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    BE1022377B1 (en) * 2015-02-18 2016-03-18 Baggerwerken Decloedt En Zoon N.V. Suction head of a dredger and method for dredging using this suction head
    WO2016132299A1 (en) 2015-02-18 2016-08-25 Baggerwerken Decloedt En Zoon N.V. Suction head of a dredging vessel and method for dredging using said suction head
    CN104818739A (en) * 2015-05-05 2015-08-05 明光市留香泵业有限公司 Suction shield head for seabed sand suction operation
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    WO2018236213A2 (en) 2017-06-22 2018-12-27 Baggermaatschappij Boskalis B.V. Trailing suction hopper dredger having a recycle system for effluent and method for suction dredging
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    DE69840281D1 (en) 2009-01-08
    EP1609916B1 (en) 2008-11-26
    EP1609916A2 (en) 2005-12-28
    ATE415524T1 (en) 2008-12-15
    CY1110897T1 (en) 2015-06-10
    HK1090398A1 (en) 2006-12-22
    ES2319781T3 (en) 2009-05-12
    EP0892116B1 (en) 2006-01-18
    DK0892116T3 (en) 2006-05-22
    BE1011285A3 (en) 1999-07-06
    PT1609916E (en) 2009-03-05
    DE69833248D1 (en) 2006-04-06
    PT892116E (en) 2006-06-30
    DE69833248T2 (en) 2006-11-02
    EP1609916A3 (en) 2006-04-05
    ES2256926T3 (en) 2006-07-16
    DK1609916T3 (en) 2009-03-16

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