EP0521032B1 - Excavation par liquide amelioree - Google Patents

Excavation par liquide amelioree Download PDF

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Publication number
EP0521032B1
EP0521032B1 EP91905990A EP91905990A EP0521032B1 EP 0521032 B1 EP0521032 B1 EP 0521032B1 EP 91905990 A EP91905990 A EP 91905990A EP 91905990 A EP91905990 A EP 91905990A EP 0521032 B1 EP0521032 B1 EP 0521032B1
Authority
EP
European Patent Office
Prior art keywords
jet
nozzles
cutting face
jets
kerf
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.)
Expired - Lifetime
Application number
EP91905990A
Other languages
German (de)
English (en)
Other versions
EP0521032A1 (fr
Inventor
Trevor John Smith
William Preston Croager
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cable and Wireless PLC
Original Assignee
Cable and Wireless PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB909006429A external-priority patent/GB9006429D0/en
Priority claimed from GB909017397A external-priority patent/GB9017397D0/en
Application filed by Cable and Wireless PLC filed Critical Cable and Wireless PLC
Publication of EP0521032A1 publication Critical patent/EP0521032A1/fr
Application granted granted Critical
Publication of EP0521032B1 publication Critical patent/EP0521032B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9206—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.
  • US Patent 1688109 describes a device intended to collect dirt, sand and gravel from the sea bed.
  • the apparatus is mounted on a surface floating vessel and includes a flexible conduit extending to the sea bed.
  • the conduit comprises a pair of concentric tubes, the outer tube being used for supply of high pressure water.
  • the outer tube may be conveniently separated into a number of high pressure blast tubes.
  • a special head designed to direct the water out under pressure to the surrounding areas to loosen the sea bed material which is then sucked away through the inner passage of the concentric tubes.
  • the inner suction passage conveys spoil to the surface vessel from where it may be processed or discharged.
  • US Patent 2956354 a dredging device for use off a boat is also described.
  • a centrally located suction bell is placed near the ocean bed to remove loosened spoil.
  • On each side of the suction pipe are located a pair of arms carrying at their ends jetting nozzles.
  • the arms are rotatable about a vertical axis, and the force for rotation is provided by use of trailing position of the jetting nozzles.
  • the rotating arms are provided with paddles which are adjustable in plane to provide adjustment for the speed of rotation of the arm.
  • the arms and jetting nozzles are arranged to sweep out a wide area of material, including an overlapping central area to loosen sea bed debris which is then carried away in central suction pipe.
  • a method of laying undersea pipes or cables comprising: moving a first jet along the line of a desired trench while causing the jet to move laterally relative to the material of a cutting face to cut a first lateral kerf in the cutting face and thereby excavating material; directing a second jet of fluid at the cutting surface and moving the second jet along the line of the desired trench while causing the second jet to move laterally relative to the material to cut a second lateral kerf in the cutting face and thereby excavating material wherein the first and second kerfs are vertically displaced from each other and are separated by a castellation, whereby the trench is formed upon removal of the material forming the castellation; and laying a pipe or cable in the trench.
  • the invention also extends to apparatus for laying undersea pipes or cables according to the method of the first aspect of the invention which apparatus includes a carrier and a plurality of nozzles, said nozzles being movably mounted on the carrier wherein the nozzles are vertically spread apart to cause jets to move along vertically spaced apart tracks to provide vertically spaced apart lateral kerfs separated by a castellation.
  • the acute angle ot 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 or 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.
  • Proposals 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.
  • 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 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, with 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.
  • the 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 with 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 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 in 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 with 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 300mm deep using the lower 13 nozzles alone or a trench 600mm deep using all 26 nozzles.
  • 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 trough. 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.
  • the wash jets are directed at the space between the cutting jets and of the cutting face to agitate the water and assist in removal of spoil.
  • the number of columns of jets can be varied to suit the width or 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.
  • the shroud 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.
  • the method of this invention relates to the use of jets of fluid (water) for excavation, e.g. of trenches, on the sea-bed.
  • 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.
  • This invention uses a jet or jets to cut the kerf by preferentially directing the jet or jets at the region where kerfs are intended (and preferably avoiding the regions where castellations are intended).
  • the cutting of the kerf or kerfs creates the castellations but a jet directed into the kerf creates a high-pressure therein, and this high pressure produces a mechanical load which causes the castellation to break up.
  • directing a jet into the kerf necessarily creates a corresponding outflow from the kerf and the detritus, e.g. both material comminuted by the jet and material arising from the breakup of the castellation, is removed from the slot by said outflow. It is usually convenient to provide a suction inlet near the workface to assist in this removal. If necessary, the detritus can be deposited a substantial distance from the working region.
  • 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).

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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)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Ceramic Products (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Earth Drilling (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Electric Cable Installation (AREA)

Claims (22)

  1. Procédé pour poser des tubes ou des câbles sous-marins, comprenant les étapes consistant à : déplacer un premier jet le long de la ligne d'une tranchée désirée tout en amenant le jet à se déplacer latéralement par rapport au matériau d'une face de découpe pour découper une première entaille latérale dans la face de découpe et grâce à ceci procéder à une excavation du matériau ; diriger un second jet de fluide vers la surface de découpe et déplacer le second jet le long de la ligne de la tranchée désirée tout en amenant le second jet à se déplacer latéralement par rapport au matériau pour découper une seconde entaille latérale dans la face de découpe et grâce à ceci à procéder à une excavation du matériau, dans lequel la première et la seconde entaille sont verticalement déplacées l'une de l'autre et sont séparées par une crénelure, grâce à quoi la tranchée est formée lorsqu'on enlève le matériau qui forme la crénelure ; et placer un tube ou un câble dans la tranchée.
  2. Procédé selon la revendication 1, dans lequel l'angle sous lequel le jet tombe sur la face de découpe (13) du matériau est de 20° à 40°.
  3. Procédé selon l'une ou l'autre des revendications 1 et 2, dans lequel la seconde entaille est adjacente à la racine (34) de la première entaille.
  4. Procédé selon l'une quelconque des revendications 1, 2 ou 3, dans lequel le jet ou les jets sont déplacés par rapport au matériau à découper (13) à vitesse constante.
  5. Procédé selon l'une quelconque des revendications 1 à 4, dans le lequel le jet ou chaque jet est émis depuis une buse mobile (12), cette buse étant maintenue à une distance sensiblement constante du matériau qui est découpé (13).
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel le jet ou les jets se déplacent de façon linéaire par rapport à un cadre de support le long de la face de découpe (13) du matériau.
  7. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel le jet ou les jets balayent un arc le long de la face de découpe (13) du matériau.
  8. Procédé selon l'une ou l'autre des revendications 6 et 7, dans lequel on applique successivement ou simultanément une pluralité de jets sur la face de découpe pour assurer l'excavation d'au moins une entaille perpendiculairement au mouvement des jets.
  9. Appareil pour poser des tubes ou des câbles sous-marins suivant le procédé de l'une quelconque des revendications précédentes, ledit appareil comprenant un support et une pluralité de buses (12), lesdites buses étant montées de façon mobile sur le support, et les buses sont écartées verticalement pour créer des jets qui se déplacent le long de pistes écartées verticalement pour produire des entailles latérales écartées verticalement, qui sont séparées par une crénelure.
  10. Appareil selon la revendication 9, dans lesquels l'orientation des buses est telle que chacune forme un angle de 20° à 40° par rapport à la face de découpe (13).
  11. Appareil selon l'une ou l'autre des revendications 9 et 10, dans lequel les buses (12) sont montées suivant une relation étagée par rapport à la direction de leur mouvement.
  12. Appareil selon la revendication 10, dans lequel les buses (12, 12a, 12b) sont agencées en hélice autour de l'axe d'un tambour rotatif (10).
  13. Appareil selon la revendication 12, comprenant des moyens formant soupape (14) agencés de façon à fournir du fluide uniquement à celles des buses qui sont adjacentes à la face de découpe (13).
  14. Appareil selon l'une ou l'autre des revendications 12 et 13, comprenant également des moyens d'évacuation adjacents (30, 32, 33, 34) pour les débris.
  15. Appareil selon la revendication 14, dans lequel les moyens d'évacuation comprennent des moyens de succion (32) et un tube de succion (30) ayant une entrée proche des buses (12).
  16. Appareil selon la revendication 15, dans lequel les moyens d'évacuation comprennent également une chemise (33) ayant une face ouverte définie par des bords qui se conforment généralement au trajet balayé par les buses, l'ouverture dans le tube de succion communiquant avec l'intérieur de la chemise.
  17. Appareil selon l'une quelconque des revendications 14, 15 ou 16, dans lequel les moyens d'évacuation comprennent un tube de sortie rotatif (38) pour diriger les débris évacués en éloignement de la face de découpe.
  18. Appareil selon l'une quelconque des revendications 14, 15 ou 16, dans lequel les moyens de succion sont un éjecteur (32).
  19. Appareil selon l'une ou l'autre des revendications 9 et 10, dans lequel un groupe de sorties de fluide (52) sont agencées dans une colonne (50).
  20. Appareil selon la revendication 19, dans lequel au moins une paire de colonnes de sorties sont agencées côte-à-côte.
  21. Appareil selon la revendication 20, dans lequel les groupes de sorties (52) sont agencés de manière à balayer sur des arcs prédéterminés (54) en opposition de phase.
  22. Appareil selon l'une ou l'autre des revendications 20 et 21, dans lequel un groupe de sorties de chasse (56) sont situées entre les colonnes adjacentes (50) et orientées pour diriger entre elles des jets de chasse.
EP91905990A 1990-03-22 1991-03-14 Excavation par liquide amelioree Expired - Lifetime EP0521032B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB909006429A GB9006429D0 (en) 1990-03-22 1990-03-22 Improvements in fluid-based excavating
GB9006429 1990-03-22
GB9017397 1990-08-08
GB909017397A GB9017397D0 (en) 1990-08-08 1990-08-08 Improvements in fluid-based excavating
PCT/GB1991/000394 WO1991014834A1 (fr) 1990-03-22 1991-03-14 Excavation par liquide amelioree

Publications (2)

Publication Number Publication Date
EP0521032A1 EP0521032A1 (fr) 1993-01-07
EP0521032B1 true EP0521032B1 (fr) 1996-05-08

Family

ID=26296827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91905990A Expired - Lifetime EP0521032B1 (fr) 1990-03-22 1991-03-14 Excavation par liquide amelioree

Country Status (7)

Country Link
EP (1) EP0521032B1 (fr)
JP (1) JPH05505222A (fr)
AT (1) ATE137833T1 (fr)
CA (1) CA2078688C (fr)
DE (1) DE69119411T2 (fr)
ES (1) ES2089200T3 (fr)
WO (1) WO1991014834A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1016635C2 (nl) * 2000-08-28 2002-03-01 Hollandsche Betongroep Nv Inrichting en werkwijze voor het aanbrengen van een sleuf in de bodem van een watergebied.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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 (fr) * 1958-11-03 1960-09-30 Acrow Eng Ltd Drague suceuse
US3019535A (en) * 1960-07-25 1962-02-06 David R Talbott Apparatus for removing matter from the bottom of waterways
IT1138764B (it) * 1981-05-04 1986-09-17 Snam Progetti Dispositivo per interramento o dissotterramento di condotte subacquee

Also Published As

Publication number Publication date
CA2078688C (fr) 1996-07-23
DE69119411D1 (de) 1996-06-13
CA2078688A1 (fr) 1991-09-23
ES2089200T3 (es) 1996-10-01
DE69119411T2 (de) 1996-11-21
JPH05505222A (ja) 1993-08-05
EP0521032A1 (fr) 1993-01-07
WO1991014834A1 (fr) 1991-10-03
ATE137833T1 (de) 1996-05-15

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