WO1991014834A1 - Improvements in fluid-based excavating - Google Patents
Improvements in fluid-based excavating Download PDFInfo
- Publication number
- WO1991014834A1 WO1991014834A1 PCT/GB1991/000394 GB9100394W WO9114834A1 WO 1991014834 A1 WO1991014834 A1 WO 1991014834A1 GB 9100394 W GB9100394 W GB 9100394W WO 9114834 A1 WO9114834 A1 WO 9114834A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nozzles
- jet
- jets
- cutting face
- spaced apart
- 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
- E02F3/9206—Digging devices using blowing effect only, like jets or propellers
-
- 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
- E02F5/10—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 fluid excavating.
- the invention is particularly applicable to fluid excavating trenches for burying cables or pipelines in the seabed-
- a method of excavating material comprising: directing at least one jet of fluid at the surface of the material and moving the jet relative to the material, the angle of the jet, impinging on a cutting face of the material, being acute with respect to that cutting face to create a kerf of material as the jet moves.
- the invention also extends to apparatus for excavating according to the method including a carrier and at least one fluid outlet, for example a nozzle, movably mounted on the carrier, characterised in that the orientation of the or each outlet subtends an acute angle with respect to the cutting face of the material to create the kerf by means of the jet of fluid from the outlet.
- a carrier and at least one fluid outlet, for example a nozzle, movably mounted on the carrier, characterised in that the orientation of the or each outlet subtends an acute angle with respect to the cutting face of the material to create the kerf by means of the jet of fluid from the outlet.
- the acute angle of impingement may be parallel to a plane which is normal to the direction of movement of the jet or at an angle thereto.
- the jet may also serve to expel material from the excavated area.
- a deeper channel may be formed than that simply created by the single jet alone.
- the material between the kerfs may not be completely detached but be connected at its root.
- a second pass of the jet, or a second jet, preferably parallel to the first serves to create the second kerf and to sever the first in one action.
- successive passes of the jet or jets will create a kerf with a width that is proportional to the jet spacing.
- a channel may be created either by longitudinal runs of the jet or jets with respect to the line of the channel or, alternatively, lateral runs.
- the jet or set of jets is moved at a constant rate relative to the material to be cut. This rate in part determines the depth of cut in a material of constant density.
- a non-constant rate may be imparted to the jet, for example sinusoidal.
- the movement may be linear. However, any other path of movement may be adopted in order to create the kerf. Another factor governing the depth of cut of the kerf is the distance of the outlet from the surface. Thus, it is also preferable that the nozzle is maintained at a small and substantially constant distance from the material being cut.
- any pattern of movement of the jet or jets may be adopted as required.
- One particular way is to sweep the jet in an arc or parabola across the cutting face of the material.
- the axis of the sweep is conveniently generally vertical when excavating, for example, a trench in a horizontal seabed.
- Propos.als for using such a jetting technique also include cutting slits in the cohesive material to make them ' more easily removable as comminuted lumps by means of a following plough arrangement.
- the cutting of slits therefore breaks up the consistency of the seabed in advance of the plough arrangement, hence reducing tow forces required to pull the plough.
- each kerf is in the manner of a scallop or scroll of material similar to the shaving created by a chisel.
- the kerf may fragment as it is forced to curl out of the path of the jet. In any case, it is the effect of the stagnation pressure at the root between the parted material and the newly created surface which forces the waste kerf away from the excavated area.
- the parameters which determine the successful removal of a kerf, instead of simply cutting into the clay, are presently considered to be the pressure of the cutting fluid, the flow rate, the nozzle profile, the vertical angle of the jet and the speed at which the jet travels across the surface.
- the cutting characteristics are also dependent on the number of jets and the spacing of the jets both in the direction of movement and normal to that direction.
- the invention comprises directing a plurality of oscillating fluid jets at the surface to be excavated at the acute angle to sheer off a succession of kerfs to form the trench.
- the channels may be formed longitudinally with respect to the overall lie of the trench being cut or be formed laterally with respect thereto.
- the cut may be achieved by means of a set of nozzles arranged in a helical pattern on a rotatable drum.
- the drum may be horizontally or vertically disposed. In either case it is necessary that the jets impinge on the material at an acute angle with respect to the material to create the kerf.
- FIGS 1A) and B) are schematic representations of an excavating arrangement according to the present invention.
- Figure 2 is an illustration of a nozzle drum assembly for use in one embodiment of the present invention
- FIG. 3 is a valve arrangement used in one embodiment of the invention.
- Figures 4A and 4B are end and side views of a component of the valve of Figure 3;
- Figures 5A, 5B, 5C and 5D are side and end views of another component of the valve of Figure 3; and Figure 6 is a side view of a modified excavating assembly.
- FIGS 7A) and B) are illustrations of parts of alternative forms of the invention.
- Figure 8 is an illustration of part of a further alternative form of the invention.
- Figure 9 is a schematic representation of the function of the invention according to another variant.
- FIG. 10 is an illustration of a further form of the invention
- a trenching apparatus comprises a submersible frame (not shown) having hydraulically driven positioning and driving propellers which are powered by a hydraulic power motors source (also not shown) on the frame.
- a hydraulic motor also rotates a 36mm. diameter nozzle drum 10 of the excavator head about its axis which is generally near vertically disposed when " the frame is arranged on a horizontal surface.
- the frame is adapted to orientate the drum 10 so that its axis of rotation is substantially normal to the attitude at which the frame rests.
- the angle of the nozzles may be more or less than 30", for example between 20" (or less) and 40".
- Each of a set of nozzles 12 in the drum is orientated to direct a jet of water from the drum downwardly at an angle of 30° with respect to a cutting face 13 of the cohesive material in which the trench is to be dug. Commonly, on a horizontal seabed this will result in a substantially vertical axis of rotation.
- the nozzles have a 2mm. outlet diameter and are angularly spaced, v/ith respect to the drum axis, at a 30mm. pitch over an axial length of 600mm. on the drum.
- the nozzles 12 are arranged on the drum in a helical pattern. This presents an overlap of the cutting effect which each individual nozzle presents in order to provide an overall effective cutting width equal to the spacing between the upper and lower-most nozzles 12a and 12b on the drum.
- nozzles 12 are fed with water pumped from a hydraulically driven pump and filter arrangement on the submersible frame to a series of conduits in the drum leading to the nozzles.
- a kidney valve arrangement 14 is used to interrupt the flow of the water to the nozzles so that fluid is passed only to the nozzles in the relevant cutting portion of each turn of the drum, i.e. when they are adjacent the cutting face 13.
- the kidney valve is shown in Figures 3, 4 and 5. It comprises a circular valve plate 16 which is secured to the frame and a distribution member 18 which bears on and is rotatable relative to the valve plate 16.
- the valve plate 16 is formed on one mating side 25 with a pair of radially spaced, angularly coincident curved channels 20 set in annular raised guides 22.
- the channels 20 are referred to in this description as kidney ports.
- the kidney ports are coaxial with the axis of rotation of the distribution member which, in turn, is coaxial v/ith the axis of rotation of the drum itself. Both • kidney ports communicate with outlet ports 24 which open on to the other side of the plate.
- the 26 nozzles 12 communicate with the kidney ports in upper and lower groups of 13. Thus, by directing water to one or both ports the active region of the drum is selectable.
- the distribution member 18 is formed ' with a plurality of distribution ports 26 which extend from its mating face 28 to the other side.
- the distribution member is also formed with an annular flange 30 by which the member is secured relative to the one end of the drum to rotate with it to distribute the pumped water to the nozzle heads.
- the mating face 28 of the distribution member 18 is sealingly engaged with that of the valve plate 16.
- the drum and attached distribution member are rotated together by means of a conventional hydraulic motor (not shown) .
- a selection of the distribution ports is in registry with the adjacent kidney port.
- nozzle water is supplied only to those distribution ports in registry for as long as they remain so.
- nozzle water is fed only to those nozzles within the effective working part of each cycle corresponding to the period when a particular nozzle is at the cutting face. In this way, the amount of pumped water required is considerably reduced.
- FIG. 6 Following on from the general description of the excavating apparatus of Figure 2 a modified arrangement is illustrated in Figure 6.
- the drum 10 is powered by a hydraulic motor and gearing arrangement not specifically illustrated in Figure 6 but which is enclosed in a housing 29.
- the drum 10 is also provided with a spoil scavenging arrangement comprising a trailing suction pipe 30, having an inlet towards the base of the drum 10 and communicating with a venturi ejector 32.
- the arrow in Figure 6 denotes the direction of travel of the drum when cutting a trench.
- the suction pipe 30 is formed with a shroud 33 which consists of an open metal box structure in which the sides defining the open face conform generally to the adjacent curved surface of the drum 10 but leaving a small gap along all edges of about 25mm. between the edges of the shroud and the drum.
- the ejector 32 has an ejector water inlet pipe 34 and a back flushing pipe 36.
- Both of these pipes 34 and 36 are attached to a further sea water pump ' system on the submersible frame respectively for creating the ejector vacuum to create suction at the open end of the suction pipe 30, adjacent the drum 10, and to flush out blockages if they occur in the ejector.
- the scavenged spoil drawn into the scavenging arrangement is exhausted through an outlet pipe 38 which is rotatable relative to the fixed suction pipe and ejector assembly to direct the spoil as required- out from the area of the cutting face.
- the outlet pipe 38 is orientatable about an upright axis by means of a worm drive and a hydraulic motor 40 which moves an engaged gear wheel 42. This orientatability is particularly useful is sub-sea applications in which the excavator and frame are remote controlled using video cameras. Strong currents can be encountered and by directing the spoil to flow with the current the chance of it drifting back into the trench is removed and the problems associated with clouding up the water, thus obscuring the view, can be avoided.
- the device is mounted on the submersible frame by means of a mounting block 44, and a pair of locating pins 46.
- the orientation of the excavator v/ith respect to the submersible frame is adjustable. In a particular situation the angle of the axis of the drum may be better tilted away from the vertical.
- the drum is designed to rotate to produce a linear speed of about 14 metres/sec.
- the water is pumped to the nozzles at 200 litres/min to develop 210 bar at the lower 13 nozzles for cutting 400kPa shear strength clay or at 300 litres/min to develop 137 bar at all 26 nozzles for cutting 200kPa clay.
- the excavator is able to . cut a trench 300 mm. deep using the lower 13, nozzles alone or a trench 600mm. deep using all 26 nozzles.
- the helical arrangement of nozzles will cut a succession of adjacent kerfs from a wall of cohesive clay or the like.
- Each nozzle jet except the top-most or bottom-most nozzles impinges on the wall constituting the cutting face opposite the root 34 of the previously formed kerf.
- the force of the jet makes and shears off a kerf in a sliver at the same time as the base of a new kerf is made.
- a large amount of the spoil created by the excavating operation is forced out ' of the way by the pressure of water. However, some will tend to fall back into the created trench. This loose material is removed by means of the following spoil scavenging system.
- the cutting fluid constituting the jet is fed to a column 50 of axially spaced outlet nozzles 52 or groups of outlets.
- the column 50 is oscillatable through an arc 54 to effect a cut. More than one oscillatable column can be used to effect the cutting of a trench.
- the spacing of cutting jet outlet nozzles 52 on the column is such that the penetration of the jet of one outlet extends past the point of initial penetration of the lower adjacent nozzle.
- the nozzles 52 create and cut kerfs contemporaneously and not in succession as the columns oscillate in antiphase.
- wash jet outlets 56' between the cutting jet nozzles are advantageous to install wash jet outlets 56' between the cutting jet nozzles.
- the wash jets are directed at the space between the cutting jets and of the cutting face to agitate the v/ater and assist in removal of spoil.
- the number of columns of jets can be varied to suit the width of. trench to be cut. Similarly, the amount of overlap between adjacent jets in a column can be varied to accommodate, for example, different densities of clay to be removed.
- a metal shroud shown in Figure 7C has groups of arcuate apertures 57 which allow the jets to impinge on the cutting face throughout their sweeps.
- the shroud can equally well be used with one column or any number of columns disposed side by side.
- a jet 58 (or jets) can be mounted on an extensible and retractable arm 60 which can be adjusted to optimise the cutting angle relative to the cutting face 13.
- a single jet is movable to progress in the direction of the trench to be cut, illustrated by the horizontal arrow in the drawing, ' while creating a series of progressively cut kerfs either by rotating or oscillating as the radius of the cycle or sweep moves forward.
- Figure 10 illustrates a further embodiment of the invention in which the plurality of nozzles 62 are equally angularly spaced about the axis of a rotatable drum 64.
- the nozzles direct jets from the end face of the drum to impinge at an acute angle to the surface.
- This embodiment can be used to break up and loosen material v/hich can be necessary in applications other than trench cutting where the sea bed has to be rendered more easily workable, for example to allow structural supporting members to be worked into the sea bed more easily.
- the apparatus illustrated in this embodiment comprises two circular, parallel discs, 100 and 101 which have inwardly facing nozzles spaced apart around their circumferences. In operation, the inwardly facing nozzles provide inwardly directed jets 102.
- the discs 100 and 101 progress along the two sides of a trench which is requrred to be created.
- the discs are rotated,, preferably by oscillation to a small angle of rotation. This causes the jets 102 to follow curved spaced apart tracks so as to cut curved, spaced apart kerfs with curved cas ellations between the kerfs.
- the castellations break away and they may be further comminuted by following jets.
- the discs are conveniently followed by suction apparatus for disposing of the spoil.
- the nozzles are located only around the forward part of the discs.
- the discs may be " provided with radially directed jets extending forward in order to cut thin slots to allow the discs to progress leaving substantial amounts of material remaining between the discs for cutting into castellations.
- the method of this invention relates to the use of jets of fluid (water) for excavation, e. g. of trenches, on the sea-bed.
- the direct effect of a jet causes thorough disintegration of the material onto which the jet impinges and, in accordance with practice as established by the prior arts, jets have been used to disintegrate substantially all the material lying in the region to be excavated.
- This invention differs from this prior usage in that it uses a jet or jets to create castellations, e. g. slabs of material.
- the castellations are removed, but the material forming the castellation is not directly disintegrated by the jet nor is it disintegrated to the same extent as material upon which the jet impinges.
- it is necessary to cut kerfs on both sides thereof, or, in the case of a castellation at the surface, on the side away from the free surface.
- This invention uses a jet or jets to cut the kerf by preferentially directing the et- or ets at the region where kerfs are intended (and preferably avoiding the regions where castellations are intended).
- Apparatus includes means for moving a jet or jets along spaced apart tracks. This produces spaced apart kerfs along the spaced apart tracks and the castellations are formed between the kerfs.
- a preferred arrangement for- producing the spaced apart jets comprises nozzles which are helically arranged about the axis of a rotatable drum.
- KERF means a cutting into solid material, e. g. the cut made by a saw, axe or similar instrument).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Ceramic Products (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Electric Cable Installation (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69119411T DE69119411T2 (en) | 1990-03-22 | 1991-03-14 | IMPROVEMENTS TO MARINE ENGINEERING |
EP91905990A EP0521032B1 (en) | 1990-03-22 | 1991-03-14 | Improvements in fluid-based excavating |
NO92923662A NO923662L (en) | 1990-03-22 | 1992-09-21 | FLUID BASED EXCAVATION |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB909006429A GB9006429D0 (en) | 1990-03-22 | 1990-03-22 | Improvements in fluid-based excavating |
GB9006429.6 | 1990-03-22 | ||
GB909017397A GB9017397D0 (en) | 1990-08-08 | 1990-08-08 | Improvements in fluid-based excavating |
GB9017397.2 | 1990-08-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991014834A1 true WO1991014834A1 (en) | 1991-10-03 |
Family
ID=26296827
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1991/000394 WO1991014834A1 (en) | 1990-03-22 | 1991-03-14 | Improvements in fluid-based excavating |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0521032B1 (en) |
JP (1) | JPH05505222A (en) |
AT (1) | ATE137833T1 (en) |
CA (1) | CA2078688C (en) |
DE (1) | DE69119411T2 (en) |
ES (1) | ES2089200T3 (en) |
WO (1) | WO1991014834A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1016635C2 (en) * | 2000-08-28 | 2002-03-01 | Hollandsche Betongroep Nv | Sea=bed trenching device for laying cable or pipeline comprises a ship=towed carriage or sledge fitted with arrangement of pivotable pressure spray angled arms on each side of the pipe |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1653027A (en) * | 1927-04-11 | 1927-12-20 | Frederic L Ward | Hydraulic excavating apparatus |
US1688109A (en) * | 1927-05-10 | 1928-10-16 | Berry Fred Forrest | Metallic-value recoverer |
FR1242432A (en) * | 1958-11-03 | 1960-09-30 | Acrow Eng Ltd | Suction dredge |
US2956354A (en) * | 1956-06-14 | 1960-10-18 | Charles W Varner | Dredging apparatus |
US3019535A (en) * | 1960-07-25 | 1962-02-06 | David R Talbott | Apparatus for removing matter from the bottom of waterways |
GB2097839A (en) * | 1981-05-04 | 1982-11-10 | Snam Progetti | Device for burying conduits laid on sea beds and for digging up conduits buried in sea beds |
-
1991
- 1991-03-14 WO PCT/GB1991/000394 patent/WO1991014834A1/en active IP Right Grant
- 1991-03-14 DE DE69119411T patent/DE69119411T2/en not_active Expired - Fee Related
- 1991-03-14 ES ES91905990T patent/ES2089200T3/en not_active Expired - Lifetime
- 1991-03-14 CA CA002078688A patent/CA2078688C/en not_active Expired - Fee Related
- 1991-03-14 AT AT91905990T patent/ATE137833T1/en not_active IP Right Cessation
- 1991-03-14 EP EP91905990A patent/EP0521032B1/en not_active Expired - Lifetime
- 1991-03-14 JP JP3505819A patent/JPH05505222A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1653027A (en) * | 1927-04-11 | 1927-12-20 | Frederic L Ward | Hydraulic excavating apparatus |
US1688109A (en) * | 1927-05-10 | 1928-10-16 | Berry Fred Forrest | Metallic-value recoverer |
US2956354A (en) * | 1956-06-14 | 1960-10-18 | Charles W Varner | Dredging apparatus |
FR1242432A (en) * | 1958-11-03 | 1960-09-30 | Acrow Eng Ltd | Suction dredge |
US3019535A (en) * | 1960-07-25 | 1962-02-06 | David R Talbott | Apparatus for removing matter from the bottom of waterways |
GB2097839A (en) * | 1981-05-04 | 1982-11-10 | Snam Progetti | Device for burying conduits laid on sea beds and for digging up conduits buried in sea beds |
Non-Patent Citations (2)
Title |
---|
Patent Abstracts of Japan, vol. 7, no. 159 (M-228)(1304), 13 July 1983; & JP-A-5865824 (SUMITOMODENKI KOGYO K.K.) 19 april 1983 * |
Patent Abstracts of Japan, vol. 7, no. 189 (M-237)(1334), 18 August 1983; & JP-A-5891237 (HITACHI SANKI ENGINEERING K.K.) 31 May 1983 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1016635C2 (en) * | 2000-08-28 | 2002-03-01 | Hollandsche Betongroep Nv | Sea=bed trenching device for laying cable or pipeline comprises a ship=towed carriage or sledge fitted with arrangement of pivotable pressure spray angled arms on each side of the pipe |
Also Published As
Publication number | Publication date |
---|---|
JPH05505222A (en) | 1993-08-05 |
EP0521032A1 (en) | 1993-01-07 |
DE69119411D1 (en) | 1996-06-13 |
DE69119411T2 (en) | 1996-11-21 |
ES2089200T3 (en) | 1996-10-01 |
CA2078688A1 (en) | 1991-09-23 |
EP0521032B1 (en) | 1996-05-08 |
ATE137833T1 (en) | 1996-05-15 |
CA2078688C (en) | 1996-07-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1609916B1 (en) | Drag head for a trailing suction hopper dredger and process for dredging by means of this drag head | |
US5542782A (en) | Method and apparatus for in situ installation of underground containment barriers under contaminated lands | |
EP0019979B1 (en) | Cutter for a suction dredger | |
US4585274A (en) | Mineral and metal particle recovery apparatus and method | |
AU620761B1 (en) | Method and tool for seabed excavation | |
CA2078688C (en) | Method and apparatus for laying undersea pipes or cables featuring rotating or oscillating jets and block removal | |
AU634791B2 (en) | Method and apparatus for cutting erosive materials using high pressure water means | |
US4943189A (en) | Method of contructing a vertical barrier wall in the ground, as well as apparatus for applying this method | |
JP3825550B2 (en) | Ground improvement and solidified wall construction equipment | |
EP0842330B1 (en) | Method and device for burying a conduit under water | |
EP0581357A1 (en) | Underwater bed cutting device | |
RU2107776C1 (en) | Method of underwater digging operations with use of suction-tube dredge and hydraulic giant for underwater trenching | |
SU861474A1 (en) | Device for contrallable break-down of faces with suction-tube dredger | |
RU2249654C1 (en) | Suction-tube dredger intake device | |
JP2008050810A (en) | Excavator for penetrating steel pipe | |
JP2872498B2 (en) | Dredging equipment | |
SU1116126A1 (en) | Working member of cable-laying machine | |
CN118043523A (en) | Subsea blower device | |
JPS6360180B2 (en) | ||
SU1638263A2 (en) | Intake device of suction dredge | |
JP3383248B2 (en) | How to dig open shield machine | |
JP2872499B2 (en) | Dredging equipment | |
JPH09221989A (en) | Pipe press-fit construction | |
JPH02190535A (en) | Trencher for laying pipe | |
JPH07103590B2 (en) | Ditch excavator for controlled installation |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA JP NO US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LU NL SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2078688 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1991905990 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1991905990 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1991905990 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref country code: CA Ref document number: 2078688 Kind code of ref document: A Format of ref document f/p: F |