EP0322935A1 - Process and device for depositing loose material under water, in particular covering a pipe or the like - Google Patents
Process and device for depositing loose material under water, in particular covering a pipe or the like Download PDFInfo
- Publication number
- EP0322935A1 EP0322935A1 EP88202340A EP88202340A EP0322935A1 EP 0322935 A1 EP0322935 A1 EP 0322935A1 EP 88202340 A EP88202340 A EP 88202340A EP 88202340 A EP88202340 A EP 88202340A EP 0322935 A1 EP0322935 A1 EP 0322935A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- length
- pipe
- tubing
- apertures
- hoses
- 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
Links
- 239000000463 material Substances 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000000151 deposition Methods 0.000 title claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 238000012384 transportation and delivery Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 2
- 239000000543 intermediate Substances 0.000 claims 2
- 239000004576 sand Substances 0.000 abstract description 5
- 230000035508 accumulation Effects 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 2
- 208000034423 Delivery Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/905—Manipulating or supporting suction pipes or ladders; Mechanical supports or floaters therefor; pipe joints for suction pipes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- 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
-
- 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
- E02F5/107—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 blowing-effect devices, e.g. 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
- E02F5/12—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with equipment for back-filling trenches or ditches
- E02F5/125—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with equipment for back-filling trenches or ditches underwater
-
- 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
- E02F5/14—Component parts for trench excavators, e.g. indicating devices travelling gear chassis, supports, skids
Definitions
- the invention relates to a process for depositing loose material under water, in which the loose material, mixed with water, is fed in at or near the bottom through a pipe which has an outflow aperture and is directed downwards from a movable device, such as a vessel, while during the infeed of this mixture the device with the pipe is moved along a specific course, so that the outflowing mixture separates under water into water and loose material, the loose material being deposited on the bottom.
- a movable device such as a vessel
- the object of the invention is to produce a process with which it is in fact possible to deposite loose material, in particular fine-grained loose material, such as fine sand, in the correct place in the correct form, without the loose material spreading in a more or less arbitrary manner.
- the mixture of water and loose material which is fed in through the pipe does not flow out through a single aperture, but through a large number of apertures lying in the direction of the course, while the delivery, i.e. the volume per unit time, flowing through the pipe is distributed among these apertures. Jets of mixture which have a small loose material outflow per aperture then emerge from the many apertures. If the pipe with the apertures is on or close to the area to be covered, then settling can take place a short distance away without the admixture of surrounding water.
- the pipe provided with outflow apertures and trailing along the bottom or moving just above it forms a ridge of loose material which can serve to cover a line or cable, but which can also be used to build up a body, such as a sand body.
- the device according to the invention can be characterized in that the outflow mouth comprises a length of tubing which runs parallel to the bottom and is provided with apertures distributed along its length, said apertures together with the then throttled end aperture of the length of tubing forming a passage which can process the delivery of the pipe.
- This length of tubing can be connected to the pipe by means of hinges with at least two pins standing at right angles to each other, and can be controlled in this way. It can therefore also be held just above the bottom, so that the outflow distance for the jets of mixture is as small as possible.
- the length of tubing can be a rigid pipe, but it can also be a flexible hose.
- the condition is that it is provided with series of outflow apertures along a great length, for example 10 to 15 metres.
- the outflow apertures are preferably disposed in the top part of the length of tubing.
- This flap can be made of tight material, but is preferably made of material which is permeable to water, but which retains the loose material. The loose material is in this way expelled from the jets and forced by the flap to settle on the bottom. Admixture with surrounding water can be fully counteracted in this way.
- Apertures can, however, also be provided in the bottom part of the length of tubing.
- the outermost hoses can be largely or fully left without lateral apertures, and the outermost hoses are longer than the innermost. A good lateral boundary is obtained in this way.
- control can be carried out by controlling the bottom end of the pipe, for example by means of cardan joints with operating cylinders disposed therein.
- the length of tubing is a funnel which from the pipe onwards has a flow cross section which increases in the direction of flow and is provided with outflow apertures in the wall.
- the increase in cross section results in a speed reduction, and thus a reduction in the emerging partial jets.
- the funnel can also pass gradually in the direction of flow from the circular cross section of the pipe to a horizontal crescent shape.
- the shape itself then provides protection against the admixture of surrounding water, and this shape is particularly beneficial for the covering of a pipe.
- Fig. 1 indicates by 1 the side of a hopper.
- a downward-slanting pipe 3 Coming out of this side wall of the hopper via an elbow 2 is a downward-slanting pipe 3, which is connected to the elbow by means of hinge arms 4, said hinge being straddled by a bellows 5.
- Said pipe 3 is suspended from the hopper by cables, such as the cable 6.
- a pipe to be covered which can lie in a channel, is indicated by 15.
- a flexible hose 21 which hangs down in a curve and rests with a long part 21′ on the course to be covered, is connected to the pipe section 11 of the pipe 3, which is designed in the same way as shown in Fig. 1.
- This hose is provided in the side walls with slit-type out-flow apertures 22, from which mixture jets 23 emerge.
- the hose part 21′ Since the hose is moved forward with the hopper along the course of the pipe 15, the hose part 21′ will remain stably in the accumulation forming.
- the accumulation 19′ obtained is flatter in shape.
- Fig. 4 shows how an accumulation 28 can be formed by means of two hoses 24, 25 with lateral outflow apertures 26, 27.
- the outflow apertures can here be disposed largely or entirely in the sides of the hoses facing each other.
- the outermost hoses can here be made tight over a large part or even fully, and serve to prevent lateral flowing away of the loose material mixture from the two innermost hoses, in such a way that most of the loose material settles between the two outermost hoses.
- the hoses 26, 27 respectively are fixed to a manifold 29, which bears a rod 30, on which the flap 31 rests, said flap extending on either side of the hoses 26 and 27.
- Fig. 7 shows an embodiment in which the length of tubing is formed by a funnel 32 with a large number of elongated outflow apertures 33 in the bottom face.
- the funnel is also crescent-shaped in cross section, as indicated at 35, with outlet apertures 36 in the bottom part. This funnel encloses the object 37 to be covered from above.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Processing Of Solid Wastes (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Abstract
Description
- The invention relates to a process for depositing loose material under water, in which the loose material, mixed with water, is fed in at or near the bottom through a pipe which has an outflow aperture and is directed downwards from a movable device, such as a vessel, while during the infeed of this mixture the device with the pipe is moved along a specific course, so that the outflowing mixture separates under water into water and loose material, the loose material being deposited on the bottom.
- Such a process is generally known. The problem which occurs here is that the mixture of water and loose material flowing out of the mouth of the pipe spreads more or less rapidly depending on the particle size of the loose material and the emerging quantity of loose material per unit time, due to the fact that the stream of mixture emerging from the mouth represents a certain amount of energy and drags along surrounding water. This results in a spread of the loose material over a much greater area than is desired, in particular when currents also occur in the water at the mouth of the outflow. This problem is greatest in the case of fine-grained material, such as fine sand, with a particle size, for example, of the order of magnitude of 100 to 200 µm (micrometres).
- Making an accumulation properly or covering an object such as a pipe or cable properly is therefore difficult to achieve with a fairly reasonable output.
- The object of the invention is to produce a process with which it is in fact possible to deposite loose material, in particular fine-grained loose material, such as fine sand, in the correct place in the correct form, without the loose material spreading in a more or less arbitrary manner.
- This object is achieved according to the invention in the first place and in principle in that, viewed in the direction of the course, the loose material mixture is made to flow out divided over a great length of the course through apertures succeeding one another in the direction of the course, in such a way that the delivery from the pipe is distributed over this great length.
- This thus means that according to the invention the mixture of water and loose material which is fed in through the pipe does not flow out through a single aperture, but through a large number of apertures lying in the direction of the course, while the delivery, i.e. the volume per unit time, flowing through the pipe is distributed among these apertures. Jets of mixture which have a small loose material outflow per aperture then emerge from the many apertures. If the pipe with the apertures is on or close to the area to be covered, then settling can take place a short distance away without the admixture of surrounding water. Since the device, such as the vessel, moves along the course to be treated, in this way the pipe provided with outflow apertures and trailing along the bottom or moving just above it forms a ridge of loose material which can serve to cover a line or cable, but which can also be used to build up a body, such as a sand body.
- The device for using the process according to the invention can be achieved in many different ways.
- In a device which consists of a vessel, a pipe directed downwards from the vessel, and an outflow mouth at the end of the pipe, the device according to the invention can be characterized in that the outflow mouth comprises a length of tubing which runs parallel to the bottom and is provided with apertures distributed along its length, said apertures together with the then throttled end aperture of the length of tubing forming a passage which can process the delivery of the pipe. This length of tubing can be connected to the pipe by means of hinges with at least two pins standing at right angles to each other, and can be controlled in this way. It can therefore also be held just above the bottom, so that the outflow distance for the jets of mixture is as small as possible.
- The length of tubing can be a rigid pipe, but it can also be a flexible hose. The condition is that it is provided with series of outflow apertures along a great length, for example 10 to 15 metres.
- If use is made of a rigid pipe the position of which can be determined accurately by means of controllable hinges, then it can be useful according to the invention to provide on top of the pipe a flexible flap which extends on either side thereof, and the length of which is at least equal to the tubing provided with apertures. This flexible flap hangs downwards, preferably in contact with the bottom, and prevents loose material from flowing away laterally.
- It is also conceivable for these flaps on either side of the length of tubing to be connected at the front and rear side by an intermediate flap, this intermediate flap being lower in height than the flap to which it is connected.
- If such a flexible flap is used, the outflow apertures are preferably disposed in the top part of the length of tubing. This flap can be made of tight material, but is preferably made of material which is permeable to water, but which retains the loose material. The loose material is in this way expelled from the jets and forced by the flap to settle on the bottom. Admixture with surrounding water can be fully counteracted in this way.
- Apertures can, however, also be provided in the bottom part of the length of tubing.
- If the length of tubing is a flexible hose, which is dragged along the bottom, it preferably has the apertures in the top parts of the side wall. However, it is then possible to connect several lines, such as, for example, two or more hoses which are fixed to a manifold, which is in turn fixed to the end of the pipe.
- If there are more than two hoses, the outermost hoses can be largely or fully left without lateral apertures, and the outermost hoses are longer than the innermost. A good lateral boundary is obtained in this way.
- If two hoses are used, use can be made again of a flexible flap which is carried by a carrier which projects above and between the hoses and is fixed to the manifold. Here again, control can be carried out by controlling the bottom end of the pipe, for example by means of cardan joints with operating cylinders disposed therein.
- Instead of a rigid pipe or a flexible hose with circular cross section, it is also possible according to the invention for the length of tubing to be a funnel which from the pipe onwards has a flow cross section which increases in the direction of flow and is provided with outflow apertures in the wall. The increase in cross section results in a speed reduction, and thus a reduction in the emerging partial jets.
- The height of this funnel can decrease in the direction of flow, so that only one outlet slot is left at the end of the funnel.
- The funnel can also pass gradually in the direction of flow from the circular cross section of the pipe to a horizontal crescent shape. The shape itself then provides protection against the admixture of surrounding water, and this shape is particularly beneficial for the covering of a pipe.
- The invention will now be explained in greater detail with reference to the drawings.
- Fig. 1 shows an embodiment of the device according to the invention, in perspective.
- Fig. 2 shows another embodiment of the device for carrying out the process according to the invention, in perspective.
- Fig. 3 is a cross section through the length of tubing provided with apertures, according to the embodiment of Fig. 1.
- Fig. 4 shows schematically in cross section the application with two hoses.
- Fig. 5 shows the application with two hoses on a flap.
- Fig. 6 shows schematically the embodiment of Fig. 5 in top view.
- Fig. 7 shows schematically in top view the embodiment with a funnel.
- Fig. 8 is a cross section along the line VIII-VIII of Fig. 7.
- Fig. 9 is a cross section along the line IX-IX of Fig. 7.
- Fig. 10 shows schematically yet another variant.
- Fig. 1 indicates by 1 the side of a hopper. Coming out of this side wall of the hopper via an elbow 2 is a downward-
slanting pipe 3, which is connected to the elbow by means of hinge arms 4, said hinge being straddled by a bellows 5. Saidpipe 3 is suspended from the hopper by cables, such as the cable 6. - Provision is made on the bottom of the
pipe 3 for a cardan joint which is shown in its entirety by 7, and is provided with a horizontal hinge 8 and a vertical hinge 9. This joint is also straddled in a known manner by means of a bellows 10. The pipe section 11 going out from the cardan joint 7 has connecting to it apipe 12, which is provided along its entire length with slits orapertures 13, and the end of which is closed, with the exception of asmall aperture 14, or is provided with apretensioned flap 14. - A pipe to be covered, which can lie in a channel, is indicated by 15.
- A
flap 16 is placed over thetubing 12 provided withslits 13 and - as shown in Fig. 3 - is held at some distance from the top wall of the length oftubing 12 by a support 17, and on either side thereof hangs down and is in contact with the bottom 18 of the water. Theflaps 16 can, if desired, be provided on the front or rear end with across flap 16‴ which does not entirely reach the bottom. - The mixture emerging from the
slits 13 forms an accumulation, indicated in its entirety by 19, under theflaps 16′, 16˝ (vide Fig. 3). - The
hopper 1 is advanced parallel to the course of thepipe 15 to be covered, so that during this advance an unbroken accumulation or sand ridge which covers thepipe 15 is formed. - It is possible to check with a
sensor 20, which is known per se, whether the length of tubing provided with apertures is actually moving along the correct course. - In the embodiment of Fig. 2 a
flexible hose 21, which hangs down in a curve and rests with along part 21′ on the course to be covered, is connected to the pipe section 11 of thepipe 3, which is designed in the same way as shown in Fig. 1. - This hose is provided in the side walls with slit-type out-
flow apertures 22, from whichmixture jets 23 emerge. - Since the hose is moved forward with the hopper along the course of the
pipe 15, thehose part 21′ will remain stably in the accumulation forming. Theaccumulation 19′ obtained is flatter in shape. In this embodiment provision is made for a number of upward-directed jets or anaperture 14 to fill in the channel left by thehose 21′. - Fig. 4 shows how an
accumulation 28 can be formed by means of twohoses lateral outflow apertures - The outflow apertures can here be disposed largely or entirely in the sides of the hoses facing each other. In an embodiment with four hoses it is possible to make the two outermost hoses considerably longer than the two innermost hoses. The outermost hoses can here be made tight over a large part or even fully, and serve to prevent lateral flowing away of the loose material mixture from the two innermost hoses, in such a way that most of the loose material settles between the two outermost hoses.
- It is also possible to use a flap in the embodiment with two hoses. This is shown in Figs. 5 and 6.
- The
hoses rod 30, on which theflap 31 rests, said flap extending on either side of thehoses - Fig. 7 shows an embodiment in which the length of tubing is formed by a
funnel 32 with a large number ofelongated outflow apertures 33 in the bottom face. - From the pipe with generally circular cross section the funnel runs in cross section in an oval shape which becomes increasingly flat and wide. The cross sections VIII-VIII and IX-IX, shown in Figs. 8 and 9 respectively, show that the flat oval shape merges into a narrow outlet slit 34.
- In the embodiment of Fig. 10 the funnel is also crescent-shaped in cross section, as indicated at 35, with
outlet apertures 36 in the bottom part. This funnel encloses theobject 37 to be covered from above.
Claims (18)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8703137 | 1987-12-24 | ||
NL8703137A NL8703137A (en) | 1987-12-24 | 1987-12-24 | METHOD AND APPARATUS FOR DEPOSITING UNDERWATER DEPOSIT, IN PARTICULAR COVERING A PIPE OR THE LIKE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0322935A1 true EP0322935A1 (en) | 1989-07-05 |
EP0322935B1 EP0322935B1 (en) | 1993-06-02 |
Family
ID=19851153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880202340 Expired - Lifetime EP0322935B1 (en) | 1987-12-24 | 1988-10-19 | Process and device for depositing loose material under water, in particular covering a pipe or the like |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0322935B1 (en) |
DE (1) | DE3881499T2 (en) |
DK (1) | DK165341C (en) |
ES (1) | ES2040833T3 (en) |
IE (1) | IE62585B1 (en) |
NL (1) | NL8703137A (en) |
NO (1) | NO163420C (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0816574A1 (en) * | 1996-07-03 | 1998-01-07 | Jan De Nul N.V. | Apparatus for burying pipes or cables in the sea bed |
GB2473471A (en) * | 2009-09-11 | 2011-03-16 | Technip France | Method of laying a pipeline in a seabed |
ITMI20110556A1 (en) * | 2011-04-05 | 2012-10-06 | Saipem Spa | FLUIDER MATERIAL DEVICE OF INERT FLUIDIFIED MATERIAL FOR SEPARING A PIPE PLACED IN A BODY OF WATER AND METHOD TO SHOOT INERT MATERIAL FLUIDIFIED ON A PIPE PLACED IN A BODY OF WATER |
WO2016076709A3 (en) * | 2014-11-11 | 2016-07-07 | Ihc Holland Ie B.V. | Hopper dredger with flocculant injection system |
US20200080282A1 (en) * | 2018-09-10 | 2020-03-12 | William R. Bath | Hydraulic Excavation Around a Pipeline Buried Under Shallow Water |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109469139A (en) * | 2018-11-08 | 2019-03-15 | 马鞍山沐及信息科技有限公司 | A kind of dredger |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL6901482A (en) * | 1968-05-27 | 1969-04-25 | ||
NL7806662A (en) * | 1978-06-20 | 1979-12-27 | Sediment Science Limited | Erodable river-bed sediment stabilisation system - deposits solids suspended in non-hardening material directly on sediment |
WO1983000060A1 (en) * | 1981-06-24 | 1983-01-06 | SKRODER, Carl, Peter | Method and machine for the laying down of underwater pipes and cables |
NL8201952A (en) * | 1982-05-12 | 1983-12-01 | Baggermaatschappij Holland B V | Underwater pipe-laying method - comprises dumping layer of stones on pipe immediately after laying in trench dredged in sea or river bed |
-
1987
- 1987-12-24 NL NL8703137A patent/NL8703137A/en not_active Application Discontinuation
-
1988
- 1988-10-19 ES ES88202340T patent/ES2040833T3/en not_active Expired - Lifetime
- 1988-10-19 EP EP19880202340 patent/EP0322935B1/en not_active Expired - Lifetime
- 1988-10-19 DE DE19883881499 patent/DE3881499T2/en not_active Expired - Fee Related
- 1988-10-24 IE IE320588A patent/IE62585B1/en not_active IP Right Cessation
- 1988-12-13 DK DK692288A patent/DK165341C/en not_active IP Right Cessation
- 1988-12-22 NO NO885723A patent/NO163420C/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL6901482A (en) * | 1968-05-27 | 1969-04-25 | ||
NL7806662A (en) * | 1978-06-20 | 1979-12-27 | Sediment Science Limited | Erodable river-bed sediment stabilisation system - deposits solids suspended in non-hardening material directly on sediment |
WO1983000060A1 (en) * | 1981-06-24 | 1983-01-06 | SKRODER, Carl, Peter | Method and machine for the laying down of underwater pipes and cables |
NL8201952A (en) * | 1982-05-12 | 1983-12-01 | Baggermaatschappij Holland B V | Underwater pipe-laying method - comprises dumping layer of stones on pipe immediately after laying in trench dredged in sea or river bed |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0816574A1 (en) * | 1996-07-03 | 1998-01-07 | Jan De Nul N.V. | Apparatus for burying pipes or cables in the sea bed |
GB2473471A (en) * | 2009-09-11 | 2011-03-16 | Technip France | Method of laying a pipeline in a seabed |
GB2473471B (en) * | 2009-09-11 | 2011-11-09 | Technip France | Method of laying a pipeline in a seabed |
ITMI20110556A1 (en) * | 2011-04-05 | 2012-10-06 | Saipem Spa | FLUIDER MATERIAL DEVICE OF INERT FLUIDIFIED MATERIAL FOR SEPARING A PIPE PLACED IN A BODY OF WATER AND METHOD TO SHOOT INERT MATERIAL FLUIDIFIED ON A PIPE PLACED IN A BODY OF WATER |
WO2012137175A1 (en) * | 2011-04-05 | 2012-10-11 | Saipem S.P.A. | Fluidified inert material spreading device for burying an underwater pipeline, and method of spreading fluidified inert material over an underwater pipeline |
US9273445B2 (en) | 2011-04-05 | 2016-03-01 | Saipem S.P.A. | Fluidified inert material spreading device for burying an underwater pipeline, and method of spreading fluidified inert material over an underwater pipeline |
EA025545B1 (en) * | 2011-04-05 | 2017-01-30 | САИПЕМ С.п.А. | Fluidified inert material spreading device for burying an underwater pipeline, and method of spreading fluidified inert material over an underwater pipeline |
WO2016076709A3 (en) * | 2014-11-11 | 2016-07-07 | Ihc Holland Ie B.V. | Hopper dredger with flocculant injection system |
NL2013770B1 (en) * | 2014-11-11 | 2016-10-06 | Ihc Holland Ie Bv | Hopper dredger with flocculant injection system. |
US20200080282A1 (en) * | 2018-09-10 | 2020-03-12 | William R. Bath | Hydraulic Excavation Around a Pipeline Buried Under Shallow Water |
US10858802B2 (en) * | 2018-09-10 | 2020-12-08 | Deepwater Corrosion Services, Inc. | Hydraulic excavation around a pipeline buried under shallow water |
Also Published As
Publication number | Publication date |
---|---|
IE883205L (en) | 1989-06-24 |
IE62585B1 (en) | 1995-02-08 |
NO163420B (en) | 1990-02-12 |
DK692288D0 (en) | 1988-12-13 |
DK165341B (en) | 1992-11-09 |
DE3881499D1 (en) | 1993-07-08 |
DE3881499T2 (en) | 1993-09-09 |
NO885723L (en) | 1989-06-26 |
ES2040833T3 (en) | 1993-11-01 |
DK692288A (en) | 1989-06-25 |
EP0322935B1 (en) | 1993-06-02 |
DK165341C (en) | 1993-04-05 |
NO163420C (en) | 1990-05-23 |
NO885723D0 (en) | 1988-12-22 |
NL8703137A (en) | 1989-07-17 |
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