WO2001014649A1 - Apparatus and method for sea bed excavation - Google Patents
Apparatus and method for sea bed excavation Download PDFInfo
- Publication number
- WO2001014649A1 WO2001014649A1 PCT/GB2000/003208 GB0003208W WO0114649A1 WO 2001014649 A1 WO2001014649 A1 WO 2001014649A1 GB 0003208 W GB0003208 W GB 0003208W WO 0114649 A1 WO0114649 A1 WO 0114649A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sea bed
- sea
- chamber
- area
- bed
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009412 basement excavation Methods 0.000 title claims abstract description 14
- 238000013019 agitation Methods 0.000 claims abstract description 22
- 239000013535 sea water Substances 0.000 claims abstract description 13
- 239000013049 sediment Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims description 4
- 230000003116 impacting effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract 1
- 239000010432 diamond Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- E02F3/9206—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
- E02F3/905—Manipulating or supporting suction pipes or ladders; Mechanical supports or floaters therefor; pipe joints for suction pipes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/907—Measuring or control devices, e.g. control units, detection means or sensors
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
Definitions
- the present invention relates to improved method and apparatus for enabling the extraction of sediment and other particulate materials from the sea bed.
- references to the sea bed should be construed broadly, and as such should be deemed to include river beds, lake beds and the like.
- the present invention is not limited to these applications but finds utility in any situation where it might be advantageous to excavate the sea bed. Usually, this will also involve the raising of the sea bed particles or other matter to the surface where would be positioned a ship or boat housing the means for performing some operation such as cleaning or separating the matter, for example.
- apparatus for use on a sea bed, the apparatus comprising a chamber defining a volume of sea water located above an area to be excavated, wherein the apparatus further comprises agitation means located within the chamber for agitating the sea bed in the said area and one or more suction means for receiving sediment or other sea bed material agitated by said agitation means.
- the chamber is substantially open at a lower part thereof.
- the chamber is partially closed at a lower part thereof by a flexible membrane and securing means, wherein the flexible membrane defines an enclosed passageway between the chamber and the sea bed.
- the suction means may communicate with one or more rigid or flexible delivery risers for conveying the sea bed material to a vessel or platform located on the sea surface.
- the vessel or platform would be provided with pumping equipment for generating suction in the suction means.
- the chamber preferably acts as a barrier to contain the agitated material from the sea bed within a volume defined by the chamber. This serves to increase the efficiency of the apparatus m that the disturbed sea bed material is captured m the excavation area such that it is maintained as available for collection by the suction means .
- the agitation means is preferably a device for etting sea water at the sea bed. It may for example comprise of a hydraulically driven propeller that is adapted to propel sea water within the chamber forcibly toward the sea bed.
- the propeller would encourage a circular flow of water in a horizontal plane, but other means may also be included, such as vanes, fins, to encourage such circular flow.
- the agitation means comprises mechanical blades or other members adapted to agitate the sea bed by consequence of physically impacting the sea bed.
- the agitation means incorporates a sonic or ultrasonic device.
- the suction means includes one or more inlets for the intake of sea bed material, wherein the or each inlet is disposed toward the perimeter of the chamber. Most preferably, an inlet is provided at each corner of the lower open side of the chamber.
- the chamber may be further provided with a vent to balance the volume of water in the chamber.
- Tre vent may be associated with a valve or plug such that the vent is kept open m normal operation, but m the event that the apparatus becomes trapped in the sea bed can be closed enabling the suction process to be reversed thus freeing the apparatus. Reversal of the suction process may involve the use of the agitation means.
- the chamber has a skirt at the lower edge of its side walls, the skirt being robust and resilient.
- a method of excavating a sea bed comprising the steps of isolating an area of the sea bed; agitating the sea bed in the said area and sucking the agitated sea bed material to a surface vessel or the like.
- the area is isolated by a physical barrier.
- the sea bed may be agitated by inducing high velocity fluid movement inside the isolated area.
- the said method is conducted for a first period of time and then repeated for successive periods in respect of successive areas to be excavated.
- each successive excavation area is adjacent the preceding area such that optimum coverage of the sea bed is performed.
- Fig.l shows a schematic elevation of a subsea diamond mining system
- FIG. 2 shows in elevation excavation apparatus in accordance with the invention
- Fig. 3 is a plan view of the excavation apparatus illustrated m Fig. 2;
- Fig. 4 is a computer generated simulation of the movement of sea water and sea bed material inside the chamber of Figs. 2 and 3;
- Fig. 5 is a plan view of an alternative embodiment of the excavation apparatus illustrated in Fig. 2;
- FIG. 6 shows m elevation an alternative embodiment of the excavation apparatus m accordance with the invention
- a sea going vessel 1 is provided with hoisting equipment 2 for the controlled lowering and raising of excavation apparatus, generally depicted at 3.
- the vessel may be provided with means for separating diamonds or material including diamonds from other waste material obtained from the sea bed. It should be appreciated that such means are not critical to the present invention; the invention hereto being concerned with the efficient and systematic collection of excavated material from the sea bed.
- the excavation apparatus 3 is more clearly depicted in Figs. 2 and 3.
- the apparatus 3 includes a chamber 4 formed substantially as a cube, but with an open lower side.
- the lower side 5 is therefore approximately square, and m the example embodiment is dimensioned with sides of 5 metres.
- a twenty inch diameter lift line 6 feeds into the chamber and divides via a manifold into four arms 7, each arm 7 terminating with an inlet 8.
- the line 6 provides a suction medium for sucking and conveying sea bed material up to the vessel 1.
- the propeller 9 Descending through the centre of the chamber is a relatively powerful water driven propeller 9.
- the propeller 9 is adapted to thrust sea water downwardly ana forcibly onto the sea bed.
- the momentum of the propelle ⁇ sea water is sufficient to agitate the sea bed to such extent as to cause sediment and other particles to unsettle and travel around the chamber 4.
- the rotary action of the propeller 9 will cause the sea water and agitated sea bed material to move in a swirling direction, which will encourage the sea bed material to migrate to the corners of the chamber 4.
- the suction inlets 8 are ideally locate ⁇ at these corners for the efficient collection of the sea bed material.
- Fig. 4 nic illustrates a simulation of the movement of the seaoe ⁇ material in the chamber 4.
- the velocity of the material is dependent on its location in relation to both the propeller 9 and the suction inlets 8. Accordingly, material located directly under the propeller 9 ana towards the centre of the sides of the chamber 4 is affected least, while the material located towards the edges of the propeller 9 and adjacent to the suction inlets 8 is displaced most.
- the chamber 4 may be provided with means to improve the swirling effect of the propeller 9 to ensure that the seabed within the area of the chamber 4 is efficiently agitated.
- Figure 5 illustrates such an alternative embodiment where baffles or directing blades 10 positioned below the propeller 9 are used to achieve this effect.
- a further embodiment of the chamber 4 may be provided such that a flexible membrane 11 and chain 12 are incorporated on the lower side 5 of the chamber.
- a flexible membrane 11 and chain 12 are incorporated on the lower side 5 of the chamber.
- the flexible membrane 11 is employed to define a shallow passageway 13 across the sea bed.
- the propeller 9 is then used to generate a high velocity water flow across the sea bed.
- the water flow enters the passageway 13 at the inlet 14 before passing into the suction inlet 8 at the other end.
- the chain 12 is employed to weigh down the flexible membrane 11 and so stop it billowing upwards when the high velocity water flow passes underneath.
- the apparatus 3 As the sea going vessel 1 passes over the area to be excavated, the apparatus 3 is placed such that the chamber 4 is stationary on the seabed. The sediment is then agitated by the action of the propeller 9. The suction arms 7 draw the sediment through the inlets 8 to the vessel 1. Agitation of a single area is typically done for 30-45 seconds depending on the nature of the sea bed to allow an appropriate depth to be excavated.
- the sediment can be filtered to remove the desired material, such as diamonds, and subsequently returned to the sea bed.
- the apparatus is then translocated to a neighbouring section of the sea bed and the process is repeated.
- the design of the apparatus is such that the entire sea bed can be covered improving the overall efficiency of the process.
- the chamber 4 is also provided with a valve (not shown) which is open during normal operation.
- the valve can be closed and the suction process reversed to free the apparatus. Potentially, this may be achieved in two ways, namely: 1) the suction through the lift line 6 may be replaced by downward flow, or 2) the suction through the lift line may be deactivated and the upward reaction force of the propeller 9 be relied upon.
- the agitation of the sea bed is achieved without causing any direct impacting of the agitation device on the sea bed. This mitigates the possibility of damaging any existing structures that might pre-exist on the sea floor.
- a further advantage of the present invention is that there is provided apparatus with improved capacity/efficiency for excavating a sea bed or the like as a result of improved coverage, higher concentration of material entering the suction arms and deeper penetration of the bed.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU68527/00A AU6852700A (en) | 1999-08-21 | 2000-08-21 | Apparatus and method for sea bed excavation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9919801.2A GB9919801D0 (en) | 1999-08-21 | 1999-08-21 | Underwater excavation chamber |
GB9919801.2 | 1999-08-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001014649A1 true WO2001014649A1 (en) | 2001-03-01 |
Family
ID=10859555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/003208 WO2001014649A1 (en) | 1999-08-21 | 2000-08-21 | Apparatus and method for sea bed excavation |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU6852700A (en) |
GB (1) | GB9919801D0 (en) |
WO (1) | WO2001014649A1 (en) |
ZA (1) | ZA200201662B (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6517287B2 (en) * | 2000-10-03 | 2003-02-11 | The United States Of America As Represented By The Secretary Of The Navy | Method for removing contaminants from dredge material in an underwater environment |
WO2003102347A2 (en) * | 2002-06-03 | 2003-12-11 | Petru Baciu | Procedure and apparatus for the extraction of methane gas from the sea bottom |
WO2004065700A1 (en) * | 2003-01-24 | 2004-08-05 | John Redding | Underwater sediment management |
WO2009133373A2 (en) * | 2008-05-01 | 2009-11-05 | Rotech Holdings Limited | Improvements in and relating to underwater excavation apparatus |
WO2010000289A1 (en) * | 2008-07-02 | 2010-01-07 | Marine Resources Exploration International Bv | A method of mining and processing seabed sediment |
CN107642346A (en) * | 2017-09-06 | 2018-01-30 | 西南石油大学 | A kind of non-diagenesis gas hydrates neck eye of sea-bottom shallow, which returns, drags jet recovery method and quarrying apparatus |
CN108894266A (en) * | 2018-06-27 | 2018-11-27 | 安徽佳明环保科技股份有限公司 | A kind of silt dredging device for river and lake dredging |
CN109339143A (en) * | 2018-11-07 | 2019-02-15 | 许智辉 | A kind of coal mine mud cleaning device |
CN110258700A (en) * | 2019-05-10 | 2019-09-20 | 刘肖俊 | One kind being conducive to water conservancy river engineering and administers with high-efficient dredging device |
CN111608221A (en) * | 2020-05-20 | 2020-09-01 | 苏州市相城生态建设管理有限公司 | High-efficient desilting system of administering in river course |
CN113716474A (en) * | 2021-11-01 | 2021-11-30 | 新乡学院 | Hoisting equipment for river channel |
CN114561984A (en) * | 2022-04-01 | 2022-05-31 | 北京金河生态科技有限公司 | Vacuum negative pressure hood suction dredging method and system for urban rivers and lakes |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1719668A (en) * | 1928-03-22 | 1929-07-02 | Mceachern Malcolm | Dredging apparatus |
US4127950A (en) * | 1977-06-02 | 1978-12-05 | Brown & Root, Inc. | Bottom jetting device |
EP0047803A1 (en) * | 1980-09-12 | 1982-03-24 | Dosbouw v.o.f. | Method of and suction dredging device for sucking up dredgings |
DE3245821A1 (en) * | 1982-12-10 | 1984-06-14 | Hamburger-Industrie-Dienstleistungsgesellschaft mbH, 2102 Hamburg | Apparatus for drawing off sand, mud, earth and the like |
EP0134312A1 (en) * | 1983-07-13 | 1985-03-20 | Dosbouw v.o.f. | Method and device for removing material lying beneath the water surface |
DE3923113A1 (en) * | 1989-07-13 | 1991-01-24 | Telefunken Systemtechnik | Arrangement for cleaning sea beds contaminated by pumpable material - has underwater vehicle with stirring system and pump in underside hopper |
JPH04146333A (en) * | 1990-10-09 | 1992-05-20 | Ube Ind Ltd | Dredging equipment |
JPH0860695A (en) * | 1994-08-22 | 1996-03-05 | Mitsubishi Heavy Ind Ltd | Small scale dredging mechanism |
DE19914703A1 (en) * | 1998-04-02 | 1999-10-21 | Goudschelp Conservenfab Bv | Harvesting apparatus for harvesting animals living in or on the seabed, in particular shellfish of the Ensis species |
-
1999
- 1999-08-21 GB GBGB9919801.2A patent/GB9919801D0/en not_active Ceased
-
2000
- 2000-08-21 WO PCT/GB2000/003208 patent/WO2001014649A1/en active Application Filing
- 2000-08-21 AU AU68527/00A patent/AU6852700A/en not_active Abandoned
-
2002
- 2002-02-27 ZA ZA200201662A patent/ZA200201662B/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1719668A (en) * | 1928-03-22 | 1929-07-02 | Mceachern Malcolm | Dredging apparatus |
US4127950A (en) * | 1977-06-02 | 1978-12-05 | Brown & Root, Inc. | Bottom jetting device |
EP0047803A1 (en) * | 1980-09-12 | 1982-03-24 | Dosbouw v.o.f. | Method of and suction dredging device for sucking up dredgings |
DE3245821A1 (en) * | 1982-12-10 | 1984-06-14 | Hamburger-Industrie-Dienstleistungsgesellschaft mbH, 2102 Hamburg | Apparatus for drawing off sand, mud, earth and the like |
EP0134312A1 (en) * | 1983-07-13 | 1985-03-20 | Dosbouw v.o.f. | Method and device for removing material lying beneath the water surface |
DE3923113A1 (en) * | 1989-07-13 | 1991-01-24 | Telefunken Systemtechnik | Arrangement for cleaning sea beds contaminated by pumpable material - has underwater vehicle with stirring system and pump in underside hopper |
JPH04146333A (en) * | 1990-10-09 | 1992-05-20 | Ube Ind Ltd | Dredging equipment |
JPH0860695A (en) * | 1994-08-22 | 1996-03-05 | Mitsubishi Heavy Ind Ltd | Small scale dredging mechanism |
DE19914703A1 (en) * | 1998-04-02 | 1999-10-21 | Goudschelp Conservenfab Bv | Harvesting apparatus for harvesting animals living in or on the seabed, in particular shellfish of the Ensis species |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 016, no. 428 (M - 1307) 8 September 1992 (1992-09-08) * |
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 07 31 July 1996 (1996-07-31) * |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6517287B2 (en) * | 2000-10-03 | 2003-02-11 | The United States Of America As Represented By The Secretary Of The Navy | Method for removing contaminants from dredge material in an underwater environment |
WO2003102347A2 (en) * | 2002-06-03 | 2003-12-11 | Petru Baciu | Procedure and apparatus for the extraction of methane gas from the sea bottom |
WO2003102347A3 (en) * | 2002-06-03 | 2004-07-08 | Petru Baciu | Procedure and apparatus for the extraction of methane gas from the sea bottom |
WO2004065700A1 (en) * | 2003-01-24 | 2004-08-05 | John Redding | Underwater sediment management |
US8522460B2 (en) | 2008-05-01 | 2013-09-03 | Rotech Holdings Limited | Underwater excavation apparatus |
WO2009133373A2 (en) * | 2008-05-01 | 2009-11-05 | Rotech Holdings Limited | Improvements in and relating to underwater excavation apparatus |
WO2009133373A3 (en) * | 2008-05-01 | 2010-04-01 | Rotech Holdings Limited | Improvements in and relating to underwater excavation apparatus |
DK178723B1 (en) * | 2008-07-02 | 2016-12-05 | Marine Resources Explor Int B V | A method of mining and processing seabed sediment |
US8950820B2 (en) | 2008-07-02 | 2015-02-10 | Marine Resources Exploration International Bv | Method of mining and processing seabed sediment |
WO2010000289A1 (en) * | 2008-07-02 | 2010-01-07 | Marine Resources Exploration International Bv | A method of mining and processing seabed sediment |
EA018733B1 (en) * | 2008-07-02 | 2013-10-30 | Марин Ресорсиз Эксплорейшн Интернешнл Бв | A method of mining and processing seabed sediment |
CN107642346B (en) * | 2017-09-06 | 2019-12-31 | 西南石油大学 | Pilot back-dragging jet mining method and mining device for seabed shallow layer non-diagenetic natural gas hydrate |
CN107642346A (en) * | 2017-09-06 | 2018-01-30 | 西南石油大学 | A kind of non-diagenesis gas hydrates neck eye of sea-bottom shallow, which returns, drags jet recovery method and quarrying apparatus |
CN108894266A (en) * | 2018-06-27 | 2018-11-27 | 安徽佳明环保科技股份有限公司 | A kind of silt dredging device for river and lake dredging |
CN109339143A (en) * | 2018-11-07 | 2019-02-15 | 许智辉 | A kind of coal mine mud cleaning device |
CN110258700A (en) * | 2019-05-10 | 2019-09-20 | 刘肖俊 | One kind being conducive to water conservancy river engineering and administers with high-efficient dredging device |
CN110258700B (en) * | 2019-05-10 | 2021-07-06 | 宁夏天顺建设工程有限公司 | Do benefit to hydraulic channel engineering and administer with high-efficient desilting device |
CN111608221A (en) * | 2020-05-20 | 2020-09-01 | 苏州市相城生态建设管理有限公司 | High-efficient desilting system of administering in river course |
CN113716474A (en) * | 2021-11-01 | 2021-11-30 | 新乡学院 | Hoisting equipment for river channel |
CN113716474B (en) * | 2021-11-01 | 2022-01-18 | 新乡学院 | Hoisting equipment for river channel |
CN114561984A (en) * | 2022-04-01 | 2022-05-31 | 北京金河生态科技有限公司 | Vacuum negative pressure hood suction dredging method and system for urban rivers and lakes |
Also Published As
Publication number | Publication date |
---|---|
ZA200201662B (en) | 2003-08-27 |
GB9919801D0 (en) | 1999-10-27 |
AU6852700A (en) | 2001-03-19 |
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