WO2010034775A1 - Drag head for a trailing suction hopper dredger and method for dredging using this drag head - Google Patents
Drag head for a trailing suction hopper dredger and method for dredging using this drag head Download PDFInfo
- Publication number
- WO2010034775A1 WO2010034775A1 PCT/EP2009/062388 EP2009062388W WO2010034775A1 WO 2010034775 A1 WO2010034775 A1 WO 2010034775A1 EP 2009062388 W EP2009062388 W EP 2009062388W WO 2010034775 A1 WO2010034775 A1 WO 2010034775A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drag head
- penetrating bodies
- disc
- visor
- teeth
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- 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
- E02F3/9268—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with rotating cutting elements
- E02F3/9281—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with rotating cutting elements with axis of rotation in horizontal and transverse direction of the suction pipe
-
- 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
- E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
-
- 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
-
- 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
Definitions
- Drag head for a trailing suction hopper dredger and method for dredging using this drag head
- the invention relates to a drag head of a trailing suction hopper dredger, comprising a visor which is dragged over the bottom and herein loosens soil, and a suction pipe which is connected to the visor and which discharges the loosened soil.
- the invention also relates to a method for dredging soil using this drag head.
- a drag head according to the preamble is known from EP-A-0892116.
- EP-A-0892116 describes a drag head for a trailing suction hopper dredger comprising a visor which is connected to a suction pipe and is open toward the bottom for dredging.
- the visor is fixed to the trailing suction hopper dredger by means of a drag pipe.
- a series of teeth is arranged on the visor.
- the drag head During the travel of the trailing suction hopper dredger the drag head is dragged over the bottom under water, wherein the soil is loosened by the teeth engaging on the bottom. The loosened soil is suctioned away via the suction pipe, for instance to a storage space present on the trailing suction hopper dredger.
- the underwater weight of the relevant components corresponds to the above-water weight thereof minus the weight of the water displaced by said components.
- the underwater weight of a steel component thus amounts to about 7/8 of the above-water weight (the relative specific weight of steel being approximately equal to 8).
- efficiency is understood to mean the volume of soil dredged per unit of time.
- the present invention has for its object to provide a drag head for a trailing suction hopper dredger which is able to dredge soil under water with an improved efficiency.
- the drag head according to the invention has for this purpose the feature that the visor of the drag head comprises at least two individually movable pressure elements transversely of the dragging direction, wherein a pressure element comprises a number of penetrating bodies which transmit forces to the bottom under the influence of the weight of the pressure element.
- the individually movable pressure elements running transversely of the dragging direction ensure that the penetrating bodies are better able to maintain contact with the bottom when the bottom is uneven.
- the existing drag head comprises a relatively large number of penetrating bodies.
- the overall drag head a larger and heavier design (for instance an above-water weight of 100 tonnes) than has heretofore been usual (the known drag head generally has an onshore weight of 20-30 tonnes).
- a heavier and larger drag head will increase the dredging efficiency significantly.
- the number of penetrating bodies can, if desired, be greater than in the known drag head.
- a greater number of penetrating bodies results in an average lower penetration depth into the bottom.
- the hereby expected lower efficiency is fully compensated by applying the individually movable pressure elements.
- the drag head according to the invention is characterized in that the pressure elements are received in the visor by means of guide means, this such that the pressure elements are translatable in a direction substantially perpendicularly of the bottom.
- Such a variant has the advantage that substantially the whole weight of each pressure element is utilized. This is because in this embodiment variant each pressure element can move substantially 'freely' (apart from friction forces and the like) in a direction perpendicularly of the bottom.
- a drag head provided with disc-shaped penetrating bodies which transmit forces to the bottom via their peripheral edge under the influence of the weight of the pressure element in which they are received.
- the disc-shaped penetrating bodies are preferably arranged with their disc plane substantially perpendicularly of the lower surface of the pressure elements, and moreover protrude partially from this lower surface, their peripheral edge comes into contact with the bottom surface.
- the weight of the associated underwater pressure element of the hopper dredger is thus distributed over the contact surface between penetrating body and bottom surface.
- a high pressure is hereby developed locally which effectively crushes the bottom, and in particular relatively hard bottom.
- the penetrating bodies extend in one line and substantially transversely of the dredging direction.
- the number of disc-shaped penetrating bodies per pressure element can be chosen within broad limits.
- the number of disc-shaped penetrating bodies per pressure element preferably lies between 2 and 20, more preferably between 2 and 10, and most preferably between 3 and 5.
- a particularly suitable intermediate distance in the transverse direction between two successive penetrating bodies amounts to between 5 and 50 cm, more preferably to between 8 and 35 cm, and most preferably to between 10 and 20 cm.
- the number of pressure elements in the drag head according to the invention can also be varied within broad limits.
- a large number of pressure elements has the advantage that the bottom contour can be followed with greater accuracy, although the average force transmitted to the bottom by the penetrating bodies will decrease.
- a small number of pressure elements results in a simpler construction. A good compromise is obtained when the number of pressure elements lies between 2 and 20, more preferably between 2 and 8, and most preferably between 3 and 5.
- the drag head is dragged over the bottom under water, wherein according to the invention it mainly makes contact with the bottom by means of the penetrating bodies, in particular the disc-shaped penetrating bodies. It is therefore advantageous to characterize the drag head in that the disc-shaped penetrating bodies are received in the pressure elements for rotation around their axis - the axis perpendicularly of the disc plane - wherein the rotation axis is substantially at a right angle to the dragging direction.
- the disc-shaped penetrating bodies are received in the pressure elements for rotation around their axis - the axis perpendicularly of the disc plane - wherein the rotation axis is substantially at a right angle to the dragging direction.
- a further advantage of the drag head according to the invention is that the bottom can be crushed into relatively small soil particles, whereby these latter are suctioned up with a good efficiency. This is understood to mean that the concentration of the relevant particles in the suctioned-up water is relatively high.
- the pressure elements of the drag head are preferably provided with a series of teeth extending substantially transversely of the dragging direction and engaging on the bottom upstream of the disc-shaped penetrating bodies during use.
- the teeth break a determined ground portion before the penetrating bodies reach this ground portion.
- the teeth can also level the bottom, whereby the disc-shaped penetrating bodies can do their work more efficiently.
- the combination of teeth and disc-shaped penetrating bodies likewise provides for an increased efficiency.
- a further improved drag head is obtained when the pressure elements are also provided with support means which during use engage on the bottom upstream of the disc-shaped penetrating bodies, and optionally of the teeth.
- these support means ensure that the pressure elements, and possibly even the whole visor, are forced to follow the contour of the bottom. This prevents jamming of and/or damage to the drag head, and in particular the disc-shaped penetrating bodies.
- the support means comprise a number of slide blocks preferably disposed in the transverse direction. The slide blocks are profiled such that the drag head does not tend to dig itself in but, on the contrary, tends to follow the bottom contour.
- the slide blocks hereby also have a protective function.
- the disc-shaped elements will generally sink a certain penetration depth into the bottom under the weight of the pressure elements. This typical penetration depth can be determined during the design of the disc-shaped penetrating bodies.
- the drag head according to the invention is characterized in that the teeth engage on the bottom preferably Vi to 10 times, more preferably Vi to 5 times, and most preferably Vi to Wi times the penetration depth of the disc-shaped penetrating bodies higher than the disc-shaped penetrating bodies.
- the teeth hereby have an optimal protective effect, and the highest efficiency is obtained.
- the teeth also have a penetration depth.
- the penetration depth of the teeth is preferably limited in order to avoid breaking of the teeth or excessively high cutting forces.
- the underside of the support means is positioned a predetermined, preferably limited distance above the underside of the teeth.
- the support means are preferably positioned such that they engage on the bottom higher than the teeth, more preferably Vi to Wi times the penetration depth of the teeth. An even better protective effect is obtained due to this measure, as well as a further improved efficiency.
- the drag head according to the invention is provided with closing means for at least partially closing the opening between components, and in particular between visor and bottom.
- closing means achieves that the suction force supplied through the suction pipe will as it were suction the drag head onto the bottom.
- the developed suction force ensures sufficient pressure stress under the penetrating bodies in the bottom, so that the bottom breaks, chips or otherwise collapses.
- the closing of the opening between the visor and the bottom can be embodied in any manner known to the skilled person.
- the closing means can thus comprise a strip of flexible material, this strip spanning the opening and being fixed to the relevant component on at least one side of the opening.
- the diameter of the penetrating bodies can vary from several centimetres to a number of decimetres. Particularly suitable diameters amount to between 2 and 80 cm, more preferably to between 5 and 60 cm, and most preferably to between 10 and 40 cm. Penetrating bodies with such diameters have a good balance between the power required per metre of headway and the dredging efficiency to be achieved, i.e. the number of m of soil dredged per second.
- the drag head according to the invention can be provided with at least one series of jet pipes for injecting water, preferably under high pressure. Usual pressures lie for instance around 10 to 200 bar, although pressures of 2500 bar are also possible.
- the water jets can be directed into the bottom in front of, on or behind the penetrating bodies in order to improve the efficiency of the dredging.
- the invention also relates to a method for breaking and/or dredging of an at least partially hard bottom under water with a trailing suction hopper dredger, equipped with a drag head according to the invention.
- the method comprises of lowering a drag head according to the invention onto the bottom, after which it is dragged over the bottom.
- a suction force is herein exerted through the suction pipe on the space at least partially closed off via closing means and enclosed by the visor and the bottom, so that the discshaped penetrating bodies penetrate via their peripheral edge into the bottom and cause cracks therein under the influence of the weight of the pressure elements and the suction force.
- the broken-off soil chips are suctioned up through the suction pipe.
- the pressure elements herein move independently of each other, whereby an improved efficiency is achieved.
- the pressure elements preferably translate independently of each other in a direction substantially perpendicularly of the bottom.
- the support means of a pressure element engage first on the bottom, wherein the pressure element is forced to follow the contour of the bottom, after which the teeth then engage on the bottom so that the bottom is at least partially levelled, after which the penetrating bodies engage on the bottom.
- figure 1 shows a schematic perspective bottom view of a drag head according to the invention
- figure 2 shows a schematic perspective top view of the drag head of figure 1
- figure 3 shows a schematic perspective bottom view of a pressure element of the drag head according to the invention
- figure 4 shows a schematic perspective top view of a support construction in which pressure elements, as shown in figure 3, can be received
- figure 5 shows a schematic view of a drag head according to the invention in operation.
- Drag head 1 for a trailing suction hopper dredger is shown with reference to figure 1.
- Drag head 1 comprises a visor 2 which during use is dragged over bottom 50 in the dragging direction P (see also figure 5) and herein loosens soil, and a suction pipe 3 which connects to visor 2 and discharges the loosened soil.
- Visor 2 is provided with side walls (84, 85) and a top plate 86 which is connected to suction pipe 3.
- visor 2 comprises four individually movable pressure elements (21, 22, 23, 24) transversely of the dragging direction P.
- Pressure elements (21, 22, 23, 24) are received in visor 2 by means of guide means (211, 212, 213, 214, 215, 216, 217, 218) (see figure 3).
- Visor 2 comprises for this purpose a support structure, shown in figure 4, which in the shown embodiment variant comprises four chambers (25, 26, 27, 28) in which pressure elements (21, 22, 23, 24) are received.
- the guide means comprise four guide rollers (211, 212, 213, 214) arranged on rear wall 31 of pressure element 21 and four guide rollers (215, 216, 217, 218) arranged on front wall 32, which can be rolled on corresponding rear wall 41 and front wall 42 of chambers (25, 26, 27, 28).
- each pressure element is provided with stop edges (33, 34) on respectively rear wall 31 and front wall 32.
- Pressure elements (21, 22, 23, 24) can hereby translate relatively freely in a direction L running substantially perpendicularly of bottom 50, wherein stop edges (33, 34) rest on the upper edge of chamber 25 in the lowermost position of for instance pressure element 21.
- each pressure element 21, 22, 23, 24 is provided with four penetrating bodies (51, 52, 53, 54).
- the penetrating bodies (51, 52, 53, 54) are disc-shaped and transmit forces to bottom 50 via their peripheral edge under the influence of the weight of the pressure element in which they are received, thereby creating cracks in the bottom.
- the disc-shaped penetrating bodies (51, 52, 53, 54) extend in one line running substantially transversely of the dragging direction P.
- the penetrating bodies of all pressure elements are preferably arranged such that they together also extend in one line running substantially transversely of the dragging direction P. This configuration is shown in figure 1.
- the pressure elements (21, 22, 23, 24) of drag head 1 are also provided with a series of teeth (61, 62, 63, 64) which extend substantially transversely of the dragging direction P and which engage on the bottom 50 upstream of the discshaped penetrating bodies (51, 52, 53, 54) during use.
- Pressure elements (21, 22, 23, 24) are further provided with support means (71, 72, 73, 74). These comprise slide blocks, for instance of steel, with a lower surface which runs obliquely from front wall 32 of a relevant pressure element 21 to the disc-shaped penetrating bodies (51, 52, 53, 54) and/or teeth (61, 62, 63, 64).
- the support means (71, 72, 73, 74) engage on the bottom upstream of the disc-shaped penetrating bodies (51, 52, 53, 54) and optionally the teeth (61, 62, 63, 64), whereby they are first to engage on bottom 50.
- the associated pressure element is therefore forced to follow the contour of bottom 50. In the case of a rise in bottom 50 the relevant pressure element will be pushed upward even before teeth (61, 62, 63, 64) and penetrating bodies (51, 52, 53, 54) can penetrate into the bottom.
- Support means not only provide a protection for the teeth and disc-shaped penetrating bodies, but also control the desired penetration depth of penetrating bodies (51, 52, 53, 54, 61, 62, 63, 64). Because teeth (61, 62, 63, 64) engage on the bottom upstream of disc-shaped penetrating bodies (51, 52, 53, 54), the teeth likewise provide protection for the disc-shaped penetrating bodies, and also control the desired penetration depth of penetrating bodies (51, 52, 53, 54). The best results are achieved when the underside of the support means is positioned at a predetermined, preferably limited distance above the underside of the teeth.
- visor 2 is provided with closing means which substantially close the opening between visor 2 and bottom 50 in order to prevent the possibility of supply water being supplied along the relatively unproductive sides of visor 2.
- the closing means comprise closing plates (81, 82) which are arranged on both side walls (84, 85) and which are slidable in height and, if desired, are provided on the lower edges thereof with a rubber cover layer.
- visor 2 is provided with a heel plate 83 which provides for sufficient support on bottom 50 and prevents water being drawn in along the upstream side.
- the method according to the invention comprises of lowering drag head 1 to the bottom 50 and dragging drag head 1 over bottom 50 in the dragging direction P.
- a suction force is herein exerted by suction pipe 3 on the space at least partially closed off via closing means (84, 85) and enclosed by visor 2 and bottom 50 so that the disc-shaped penetrating bodies (51, 52, 53, 54) penetrate via their peripheral edge into bottom 50 and cause cracks therein under the influence of the weight of the pressure element in which they are received.
- a further improved efficiency is achieved by applying a combination of teeth and disc-shaped penetrating bodies, wherein the teeth are first to engage on the bottom to a determined penetration depth so that bottom 50 is at least partially levelled, after which the disc-shaped penetrating bodies engage on bottom 50. It can also be advantageous to provide a drag head in which the disc-shaped penetrating bodies engage first on the bottom to a determined penetration depth so that bottom 50 is at least partially broken up, after which the teeth then engage on bottom 50.
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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)
- Treatment Of Sludge (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
- Earth Drilling (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
- Catching Or Destruction (AREA)
- Revetment (AREA)
- Sink And Installation For Waste Water (AREA)
- Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Floor Finish (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK09815688.8T DK2342385T3 (en) | 2008-09-29 | 2009-09-24 | TOWERS FOR A DRAWING VESSEL AND PROCEDURE FOR EXTENDING USING THIS TOWERS |
US13/121,634 US20110239493A1 (en) | 2008-09-29 | 2009-09-24 | Drag head for a trailing suction hopper dredger and method for dredging using this drag head |
ES09815688T ES2391881T3 (en) | 2008-09-29 | 2009-09-24 | Drag head for a pitcher dredger with suction tube and dredging procedure using this drag head |
AU2009295885A AU2009295885B2 (en) | 2008-09-29 | 2009-09-24 | Drag head for a trailing suction hopper dredger and method for dredging using this drag head |
EP09815688A EP2342385B1 (en) | 2008-09-29 | 2009-09-24 | Drag head for a trailing suction hopper dredger and method for dredging using this drag head |
JP2011528323A JP5346378B2 (en) | 2008-09-29 | 2009-09-24 | Drag head for trailing suction hopper dredger and dredging method using this drag head |
NZ592074A NZ592074A (en) | 2008-09-29 | 2009-09-24 | Drag head for a trailing suction hopper dredger and method for dredging using this drag head |
ZA2011/02455A ZA201102455B (en) | 2008-09-29 | 2011-04-01 | Drag head for a trailing suction hopper dredger and method for dredging using this drag head |
HK11109714.3A HK1155496A1 (en) | 2008-09-29 | 2011-09-15 | Drag head for a trailing suction hopper dredger and method for dredging using this drag head |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BEBE2008/0544 | 2008-09-29 | ||
BE2008/0544A BE1018312A3 (en) | 2008-09-29 | 2008-09-29 | Towing head for a towing hopper and method for dredging using this towing head. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010034775A1 true WO2010034775A1 (en) | 2010-04-01 |
Family
ID=40474174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2009/062388 WO2010034775A1 (en) | 2008-09-29 | 2009-09-24 | Drag head for a trailing suction hopper dredger and method for dredging using this drag head |
Country Status (17)
Country | Link |
---|---|
US (1) | US20110239493A1 (en) |
EP (1) | EP2342385B1 (en) |
JP (1) | JP5346378B2 (en) |
KR (1) | KR101646632B1 (en) |
AR (1) | AR073698A1 (en) |
AU (1) | AU2009295885B2 (en) |
BE (1) | BE1018312A3 (en) |
DK (1) | DK2342385T3 (en) |
ES (1) | ES2391881T3 (en) |
HK (1) | HK1155496A1 (en) |
MY (1) | MY157476A (en) |
NZ (1) | NZ592074A (en) |
PA (1) | PA8844001A1 (en) |
PT (1) | PT2342385E (en) |
TW (1) | TWI541409B (en) |
WO (1) | WO2010034775A1 (en) |
ZA (1) | ZA201102455B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
NL2011961C2 (en) * | 2013-12-13 | 2015-06-16 | Ihc Holland Ie Bv | Modular visor for a drag head. |
EP3483347A1 (en) * | 2017-11-10 | 2019-05-15 | Shanghai Zhenhua Heavy Industries Co., Ltd | Dredging system for pre-paved gravel foundation bed surface in open sea deep water and dredger |
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ES2694415T3 (en) * | 2012-07-27 | 2018-12-20 | Nautilus Minerals Pacific Pty Ltd | Self-cleaning collection apparatus and procedure |
US9303384B2 (en) * | 2013-04-17 | 2016-04-05 | Colorado School Of Mines | Cavitating water jet hard rock dredge mining system |
KR101499151B1 (en) * | 2014-07-04 | 2015-03-06 | (주)대우건설 | System and method for flattening dredged sea-bed using plough |
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 |
NL2020312B1 (en) * | 2018-01-24 | 2018-11-09 | Carpdredging Ip B V | EXCAVATOR |
MX2021007762A (en) * | 2018-12-26 | 2021-10-13 | Cashman Dredging And Marine Contracting Co Llc | Dragging apparatus with ripper shank. |
CN111395434B (en) * | 2020-04-20 | 2022-03-18 | 中交疏浚技术装备国家工程研究中心有限公司 | Trailing suction dredger |
CN113306673A (en) * | 2021-05-20 | 2021-08-27 | 湖南湘船重工有限公司 | Ship drag mud measuring and early warning method and system |
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GB2025492A (en) * | 1978-07-18 | 1980-01-23 | Ihc Holland Nv | Dragging type head for a suction dredger |
NL8005126A (en) * | 1980-09-11 | 1980-12-31 | Ballast Nedam Groep Nv | Underwater rock loosening system - thrusts tools in from above to disturb structure in uppermost layer of bed |
NL8702390A (en) * | 1987-10-07 | 1989-05-01 | Bos Kalis Bv | Suction dredging method for sucking up sludge - has sludge-water mixt. pumped through towed suction head with detector controlling flow rate |
RU1796002C (en) * | 1990-01-18 | 1993-02-15 | Ростовское центральное проектно-конструкторское бюро "Стапель" | Drag soil intake device of suction tube dredge |
JPH07138978A (en) * | 1993-11-18 | 1995-05-30 | Mitsui Eng & Shipbuild Co Ltd | Sludge collecting device |
WO2006027325A1 (en) * | 2004-09-10 | 2006-03-16 | Dredging International | Draghead for a trailing suction hopper and process for dredging by means of this draghead |
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 |
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US724501A (en) * | 1903-01-02 | 1903-04-07 | Jesse W Reno | Hydraulic dredge. |
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US1840606A (en) * | 1929-02-27 | 1932-01-12 | Scheffauer Frederick Carl | Self-adjusting draghead |
US1939389A (en) * | 1932-12-31 | 1933-12-12 | Mark M Condron | Drag-head for dredging machines |
US3305950A (en) * | 1964-04-14 | 1967-02-28 | Newport News Shipbuilding | Underwater mining |
NL175211C (en) * | 1973-10-15 | 1984-10-01 | Bos Kalis Westminster | DEVICE AND METHOD FOR VACING A GROUND SUSPENSION WITH A TRANSPORT MEDIUM. |
NL161222C (en) * | 1975-08-25 | 1980-01-15 | Ballast Nedam Groep Nv | VACUUM CLEANER. |
NL165249C (en) * | 1975-12-19 | 1981-03-16 | Ballast Nedam Groep Nv | METHOD AND APPARATUS FOR BREAKING HARD SOIL CONTAINED UNDERWATER |
US4141159A (en) * | 1977-03-18 | 1979-02-27 | Summa Corporation | Method and apparatus for deep sea mining |
NL166514C (en) * | 1977-12-27 | 1981-08-17 | Volker Groep Nv | Towing head for a dredger. |
DE4405451A1 (en) * | 1994-02-21 | 1995-08-31 | Krupp Foerdertechnik Gmbh | Method and device for suctioning off the bottom of water |
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GB0301660D0 (en) * | 2003-01-24 | 2003-02-26 | Redding John | Dredging scouring & excavation |
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2008
- 2008-09-29 BE BE2008/0544A patent/BE1018312A3/en not_active IP Right Cessation
-
2009
- 2009-09-24 PT PT09815688T patent/PT2342385E/en unknown
- 2009-09-24 KR KR1020117009818A patent/KR101646632B1/en active IP Right Grant
- 2009-09-24 ES ES09815688T patent/ES2391881T3/en active Active
- 2009-09-24 NZ NZ592074A patent/NZ592074A/en not_active IP Right Cessation
- 2009-09-24 AU AU2009295885A patent/AU2009295885B2/en not_active Ceased
- 2009-09-24 US US13/121,634 patent/US20110239493A1/en not_active Abandoned
- 2009-09-24 WO PCT/EP2009/062388 patent/WO2010034775A1/en active Application Filing
- 2009-09-24 MY MYPI2011001903A patent/MY157476A/en unknown
- 2009-09-24 DK DK09815688.8T patent/DK2342385T3/en active
- 2009-09-24 EP EP09815688A patent/EP2342385B1/en not_active Not-in-force
- 2009-09-24 JP JP2011528323A patent/JP5346378B2/en not_active Expired - Fee Related
- 2009-09-25 TW TW098132422A patent/TWI541409B/en not_active IP Right Cessation
- 2009-09-28 AR ARP090103724A patent/AR073698A1/en not_active Application Discontinuation
- 2009-09-29 PA PA20098844001A patent/PA8844001A1/en unknown
-
2011
- 2011-04-01 ZA ZA2011/02455A patent/ZA201102455B/en unknown
- 2011-09-15 HK HK11109714.3A patent/HK1155496A1/en not_active IP Right Cessation
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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. |
RU2603685C2 (en) * | 2011-02-02 | 2016-11-27 | Багерверкен Деклудт Эн Зон | Suction head for dredging vessel and method for dredging using said suction head |
NL2011961C2 (en) * | 2013-12-13 | 2015-06-16 | Ihc Holland Ie Bv | Modular visor for a drag head. |
EP3483347A1 (en) * | 2017-11-10 | 2019-05-15 | Shanghai Zhenhua Heavy Industries Co., Ltd | Dredging system for pre-paved gravel foundation bed surface in open sea deep water and dredger |
Also Published As
Publication number | Publication date |
---|---|
BE1018312A3 (en) | 2010-08-03 |
AR073698A1 (en) | 2010-11-24 |
US20110239493A1 (en) | 2011-10-06 |
EP2342385B1 (en) | 2012-08-22 |
PA8844001A1 (en) | 2010-05-26 |
JP2012504196A (en) | 2012-02-16 |
TW201020375A (en) | 2010-06-01 |
ZA201102455B (en) | 2011-12-28 |
HK1155496A1 (en) | 2012-05-18 |
KR20110079703A (en) | 2011-07-07 |
DK2342385T3 (en) | 2012-10-22 |
NZ592074A (en) | 2012-08-31 |
PT2342385E (en) | 2012-11-13 |
ES2391881T3 (en) | 2012-11-30 |
JP5346378B2 (en) | 2013-11-20 |
TWI541409B (en) | 2016-07-11 |
MY157476A (en) | 2016-06-15 |
EP2342385A1 (en) | 2011-07-13 |
KR101646632B1 (en) | 2016-08-08 |
AU2009295885A1 (en) | 2010-04-01 |
AU2009295885B2 (en) | 2016-02-11 |
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