EP3985176B1 - Bateau de travail de dragage - Google Patents

Bateau de travail de dragage Download PDF

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Publication number
EP3985176B1
EP3985176B1 EP20822136.6A EP20822136A EP3985176B1 EP 3985176 B1 EP3985176 B1 EP 3985176B1 EP 20822136 A EP20822136 A EP 20822136A EP 3985176 B1 EP3985176 B1 EP 3985176B1
Authority
EP
European Patent Office
Prior art keywords
sediment
hull
discharge pipe
sand discharge
water
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.)
Active
Application number
EP20822136.6A
Other languages
German (de)
English (en)
Other versions
EP3985176A4 (fr
EP3985176A1 (fr
Inventor
Tokuaki Kojima
Taketoshi Maeda
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.)
Kojimagumi Co Ltd
Kojimagumi Co Ltd
Original Assignee
Kojimagumi Co Ltd
Kojimagumi Co Ltd
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
Application filed by Kojimagumi Co Ltd, Kojimagumi Co Ltd filed Critical Kojimagumi Co Ltd
Publication of EP3985176A1 publication Critical patent/EP3985176A1/fr
Publication of EP3985176A4 publication Critical patent/EP3985176A4/fr
Application granted granted Critical
Publication of EP3985176B1 publication Critical patent/EP3985176B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E02F3/8833—Floating installations
    • E02F3/8841—Floating installations wherein at least a part of the soil-shifting equipment is mounted on a ladder or boom
    • 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
    • E02F3/8833—Floating installations
    • E02F3/885—Floating installations self propelled, e.g. ship
    • 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
    • E02F3/46—Dredgers; Soil-shifting machines mechanically-driven with reciprocating digging or scraping elements moved by cables or hoisting ropes ; Drives or control devices therefor
    • E02F3/47—Dredgers; Soil-shifting machines mechanically-driven with reciprocating digging or scraping elements moved by cables or hoisting ropes ; Drives or control devices therefor with grab buckets
    • 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
    • E02F3/46—Dredgers; Soil-shifting machines mechanically-driven with reciprocating digging or scraping elements moved by cables or hoisting ropes ; Drives or control devices therefor
    • E02F3/58—Component parts
    • 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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
    • E02F3/9218—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel with jets
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/04—Loading devices mounted on a dredger or an excavator hopper dredgers, also equipment for unloading the hopper
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/10—Pipelines for conveying excavated materials

Definitions

  • the present invention relates to a dredger, and in particular to a dredger that includes a hull, a bucket device that can scoop up and excavate sediment on a water bottom, a drive device that is provided between the bucket device and the hull and moves the bucket device horizontally and vertically underwater, and a sediment transport pipe that transports sediment excavated by the bucket device to a sediment collection location above the water.
  • Patent Document 1 Japanese Patent Application Laid-open No. 7-26580
  • a bucket device is provided with a pair of scoop plates that can be opened and closed, and by virtue of a swinging operation to open and close the scoop plates sediment on a water bottom is scooped up into the scoop plates and the excavated sediment thus scooped up is pushed into a sand discharge pipe.
  • US 2 952 083 A shows a marine dredge provided with boom, bucket, a suction pipe and jetting means.
  • the present invention has been proposed in light of the above circumstances, and it is an object thereof to provide a dredger that can solve the problems of the conventional dredger.
  • a dredger comprising a hull, a bucket device that can scoop up and excavate sediment on a water bottom, drive means that is provided between the bucket device and the hull and moves the bucket device underwater, and a sediment transport pipe that transports a sediment excavated by the bucket device to a sediment collection location above water
  • the bucket device comprises a bottomed tubular main frame that is linked to and supported by the drive means and can be driven horizontally and vertically underwater, a raise/lower body that is formed into a tubular shape having upper and lower ends open and is vertically slidably fitted around an outer periphery of the main frame, a pair of scoop plates that are axially supported on lower end parts of the raise/lower body so that sediment at the water bottom can be scooped up by opening and closing the open lower end of the raise/lower body, an open/close drive device that drives the two scoop plates to open and close, a
  • the main frame has a bottom wall formed as a downwardly convex curved face, and the one end of the sand discharge pipe opens on a central apex part of the bottom wall.
  • the bucket device is provided with a sediment flow assistance device that injects pressurized air and/or pressurized water toward the excavated sediment pushed into the sand discharge pipe so as to disperse the sediment within the sand discharge pipe and assist flow of the sediment from the sand discharge pipe toward the sediment collection location via the sediment transport pipe.
  • the sediment flow assistance device comprises first jet means that injects pressurized air and/or pressurized water toward the excavated sediment pushed into the sand discharge pipe and second jet means that can inject pressurized air and/or pressurized water into a space between the pair of scoop plates in a closed state and the bottom wall.
  • the hull is provided with a sediment collection tank that becomes the sediment collection location.
  • the bottom wall of the main frame is formed into a curved face protruding downward, and one end of the sand discharge pipe opens on the central apex part of the bottom wall, it is possible to evenly push the excavated sediment, which has been scooped up into the pair of scoop plates, into the sand discharge pipe, thus enhancing the efficiency with which it is pushed in.
  • the sediment flow assistance device which injects pressurized air and/or pressurized water toward the sediment pushed into the sand discharge pipe so as to disperse the sediment within the sand discharge pipe and assist the flow of the sediment from the sand discharge pipe toward the sediment collection location via the sediment transport pipe
  • the sediment flow assistance device which injects pressurized air and/or pressurized water toward the sediment pushed into the sand discharge pipe so as to disperse the sediment within the sand discharge pipe and assist the flow of the sediment from the sand discharge pipe toward the sediment collection location via the sediment transport pipe
  • the jet pressure of pressurized air and/or pressurized water for dispersing sediment within the sand discharge pipe can be used effectively as pressure for transporting sediment within the sediment transport pipe. This enables the efficiency with which sediment is fed under pressure through the sand discharge pipe and the sediment transport pipe to be enhanced effectively.
  • the sediment flow assistance device incudes, in addition to the first jet means, which injects pressurized air and/or pressurized water toward the excavated sediment pushed into the sand discharge pipe, the second jet means, which can inject pressurized air and/or pressurized water into a space between the two scoop plates in a closed state and the main frame bottom wall, it is possible, by injecting the pressurized air and pressurized water injected from the second jet means into the space, to efficiently disperse the excavated sediment, which has been scooped into the scoop plates, within the scoop plates prior to it being pushed into the sand discharge pipe, thus enhancing its flowability and enabling it to be smoothly pushed into the sand discharge pipe, and thereby contributing to increasing the efficiency with which it is pushed in.
  • the dredged sediment can be stored in the dredger itself without having a barge alongside the dredger and on standby; it is therefore possible to continue dredging when there is no barge, and also when the bucket device, etc. malfunctions and dredging is discontinued, sediment that has been stored in the dredger up to that time can be transshipped to a barge, thus increasing the overall operating efficiency.
  • a dredger S includes a hull 1 that floats on the water surface, for example, on the sea surface, a hull propulsion device D that can propel the hull 1 along the water surface, a boom B that is axially supported p1 on the hull 1 so that it can swing (tilt) in the vertical direction, a first wire W1 that has one end linked to an extremity part Ba of the boom B, a first winch device M1 for boom tilting that is provided on the hull 1 and can take up and let out the other end side of the first wire W1, a grab bucket G as a bucket device that is suspended from the extremity part Ba of the boom B via a second wire W2, a second winch device M2 for bucket raising/lowering that is provided on the hull 1 and can take up and let out the second wire W2, and a pair of left and right sediment collection tanks 3 that are disposed on the hull 1 so as to form a sediment collection location above the water.
  • the first winch device M1 includes a drum that can take up the first wire W1 and a motor that rotates the drum. Taking up or letting out the first wire W1 by means of the first winch device M1 enables the boom B linked to the wire W1 to be tilted upward or downward.
  • the second winch device M2 includes a drum that can take up the second wire W2 and a motor that rotates the drum. Taking up or letting out the second wire W2 by means of the second winch device M2 enables the grab bucket G hanging down from the wire W2 to be raised or lowered.
  • the first and second wires W1, W2 are each provided as left and right pairs, but there may be one of each or three or more of each.
  • the grab bucket G is, as described later, formed so as to scoop up and excavate a sediment 4 on a water bottom E, and the excavated sediment scooped up into the grab bucket G is fed under pressure to the sediment collection tank 3 above water through a sediment transport pipe 8 having flexibility. Therefore, it is not necessary to pull up the grab bucket G above water each time when carrying out dredging, and the work efficiency is thus improved.
  • the grab bucket G is one example of the bucket device of the present invention. The structure of the grab bucket G is more specifically described later.
  • the boom B has a base end part Bb thereof axially supported p1 on a carriage portion 5b of a movable support body 5 mounted on a front part of the hull 1 so that it can move only in the fore-and-aft direction, and the boom B can swing around the axially supported p1 part in the vertical direction not only above water but also underwater.
  • the carriage portion 5b has a cutout-shaped boom clearance portion 5bk as is clear from a partial enlarged perspective view of FIG. 2 in order to avoid interference between the boom B and the movable support body 5 regardless of the attitude of tilting of the boom B.
  • the movable support body 5 is linked and coupled to a drive device that is provided between the carriage portion 5b thereof and the hull 1 and can be driven on the hull 1 in the fore-and-aft direction together with the base end part Bb of the boom B.
  • a drive device for example, a structure in which as shown in FIG. 2 a brake mechanism-equipped driven wheel 5w axially supported on the carriage portion 5b and being capable of running along a guide rail 9 fixed to the hull 1 is driven at reduced speed by a motor, which is not illustrated, or a structure, although not illustrated, in which a brake mechanism-equipped pinion meshing with a rack fixed to the hull 1 and axially supported on the carriage portion 5b is driven at reduced speed by a motor, etc. can be employed.
  • the boom B attains a state in which as shown in FIG. 1 it protrudes toward the foremost side and can swing vertically between an upward swing limit at which it rises above the water surface and a downward swing limit at which it is submerged under the water surface.
  • a clearance portion 1a for allowing the boom B to swing to the downward swing limit underwater, the clearance portion 1a being formed as a cutout opening upward, downward and forward.
  • the boom B In a state in which the movable support body 5 is withdrawn all the way back with the boom B in a horizontal attitude, the boom B attains a withdrawn state in which it is most withdrawn as shown in a chain line in FIG. 1 .
  • This withdrawn state is selected when the dredger S is moved over a long distance, when the grab bucket G is subjected to inspection and maintenance, etc.
  • a support frame 6 that is formed into a gate shape so as to straddle the locus of fore-and-aft movement of the movable support body 5.
  • a first guide roller r1 Rotatably supported on an upper part of the support frame 6 is a first guide roller r1 through which an intermediate part of the first wire W1 let out from the first winch device M1 is guided.
  • an intermediate part of the second wire W2 let out from the second winch device M2 is guided through a second guide roller r2 rotatably supported on the movable support body 5 and a pair of front and rear third guide rollers r3 rotatably supported on the extremity part Ba of the boom B, and hangs down via the extremity part Ba of the boom B.
  • the second guide roller r2 is axially supported on an upper end part of a support platform 5a standingly provided on the carriage portion 5b of the movable support body 5. The arrangement is such that the second wire W2 passes through between the pair of front and rear third guide rollers r3.
  • the grab bucket G includes a bottomed cylindrical main frame 11, a raise/lower tube 12 as a raise/lower body that is formed into a cylindrical shape having upper and lower ends open and is vertically slidably fitted onto the outer periphery of the main frame 11 via a plurality of annular seal members 18, a pair of scoop plates 13 that have their base part linked by pivot support link (axial support) p2 to a lower end part of the raise/lower tube 12 via hinge brackets b2, b3 so that they can open/close an open lower end of the raise/lower tube 12 and scoop the sediment 4 on the water bottom E into the interior, a first hydraulic cylinder Cy1 as an open/close drive device that opens and closes the two scoop plates 13, a second hydraulic cylinder Cy2 as a raise/lower drive device that raises and lowers the raise/lower tube 12 with respect to the main frame 11, a sand discharge pipe P that
  • the annular seal member 18 is fitted into an annular groove provided in either one of mutually opposing peripheral faces of the main frame 11 and the raise/lower tube 12, and is in sliding contact with the other of the opposing peripheral faces.
  • An upper end wall 1 1a of the main frame 11 is linked to and supported by a free end of the second wire W2, that is, the lower end thereof.
  • the second wire W2 can drive the main frame 11 (and therefore the grab bucket G) in the horizontal and vertical directions in the water in association with movement of the hull 1, the second winch device M2 and the boom B.
  • a lower end wall, that is, the bottom wall 11b, of the main frame 11 is formed into a hemispherical plate shape curving protrudingly downward, and a large diameter lower end (that is, one end of the sand discharge pipe P) Pi of a lower half pipe part, forming a truncated cone shape, of the sand discharge pipe P opens and is fixed to a center part of the bottom wall 11b, that is, a central apex part of the hemispherical surface bulging downward.
  • An upper half pipe part of the sand discharge pipe P is formed into a cylindrical shape, the lower end of the upper half pipe part is connected integrally to a small diameter upper end of the lower half pipe part, and the upper end of the upper half pipe part (that is, the other end of the sand discharge pipe P) is connected to the upstream end of the sediment transport pipe 8 via a joint.
  • the sand discharge pipe P has its intermediate part fixed to and supported on an inner peripheral wall of the main frame 11 via a plurality of support plates 16, and has its upper part extending through and fixed to the upper end wall 1 1a of the main frame 11.
  • the check valve 15 prevents downward reverse flow of sediment; in the illustrated example only one thereof is placed on the upper half pipe part of the sand discharge pipe P, but the number and the position of check valves 15 placed and the valve body structure are not limited to those of the embodiment and can be set as appropriate.
  • the check valve 15 may be placed also in the vicinity of the lower end Pi of the lower half pipe part of the sand discharge pipe P or an intermediate part thereof.
  • the check valve 15 of the present embodiment has a valve structure with a single-sided opening type single leaf valve body, but when the check valve 15 is placed in a large diameter portion in particular (for example, in the vicinity of the lower end Pi of the lower half pipe part or an intermediate part thereof) of the sand discharge pipe P, a valve structure having a double-sided opening (that is, double opening from the center) type pair of leaf valve bodies may be employed. Wherever the check valve 15 is placed, it is desirable that a valve body clearance part (not illustrated) is recessed in an inner face of the sand discharge pipe P in order to avoid interference with the valve body of the check valve 15 and ensure smooth opening and closing of the valve body.
  • a stopper projection (not illustrated) is provided on an inner peripheral face of the sand discharge pipe P, the stopper projection being capable of engaging with the valve body in order to prevent the valve body of the check valve 15 from unnecessarily opening downward and pivoting from the fully closed position.
  • the pair of scoop plates 13 have a symmetrical shape to each other and are formed into a hemispherical plate shape such that in a state in which the two are closed (see FIG. 3 and FIG. 5 ) they closely oppose a lower face of the bottom wall 11b having the hemispherical plate-shape of the main frame 11 (that is, a hemispherical plate form further divided equally into two).
  • the excavated sediment 4 that has been scooped up by means of the two scoop plates 13 is forcibly pushed into the sand discharge pipe P by raising the raise/lower tube 12 with respect to the main frame 11 in a state in which the scoop plate 13 is closed.
  • Edges of the pair of scoop plates 13 as mutually mating faces are formed so as to have a slightly tapered cross section in order to make it harder for sediment to be sandwiched when the two scoop plates 13 are closed.
  • the edges of the two scoop plates 13 (in particular, the lower edge) may be fixedly provided as necessary with a plurality of claws in an alternating manner that can efficiently break the sediment on the water bottom.
  • a base part of a short cylindrical extended plate portion 12a that extends downward from the lower end of the raise/lower tube 12.
  • the extremity, that is, the lower end, of the extended plate portion 12a abuts against upper edges of the two scoop plates 13 when the two scoop plates 13 are closed.
  • the extremity of the extended plate portion 12a is abutted directly against the upper edges of the two scoop plates 13 in the fully closed state, but a seal member, which is not illustrated, formed from an elastic material (for example, a rubber material), may be attached to at least one of the extremity of the extended plate portion 12a and the upper edge of the two scoop plates 13 in the fully closed state, and in this case the effect in sealing the space 40 can be further enhanced.
  • the illustrated example shows a case in which the extended plate portion 12a is formed integrally with the main body part of the raise/lower tube 12, but the extended plate portion 12a may be formed as a body separate from the main body part of the raise/lower tube 12 and subsequently fixed (for example, welded) to the raise/lower tube 12.
  • FIG. 9 shows a modified example of the extended plate portion.
  • a base part of an arc plate-shaped extended plate portion 13a extending upward from the upper end of each scoop plate 13 is connectedly provided on an upper end part of the scoop plate 13, and the extremity, that is, the upper end, of the extended plate portion 13a is abutted against the lower edge of the raise/lower tube 12 when the two scoop plates 13 are closed.
  • the gap between the lower edge of the raise/lower tube 12 and the upper edge of the two scoop plates 13 in the fully closed state can be made substantially zero or very small.
  • a seal member may be attached to the extremity of the extended plate portion 13a and/or the lower end of the raise/lower tube 12, and in this case the effect in sealing the space 40 can be further enhanced.
  • the extended plate portion 13a may be formed as a body separate from the scoop plate 13 and subsequently fixed (for example, welded) to the scoop plate 13.
  • a pair of the first hydraulic cylinders Cy1 are disposed per scoop plate 13.
  • a base end of the first hydraulic cylinder Cy1 is linked by a pivot support link p3 to an upper part of an outer peripheral wall of the raise/lower tube 12 via a hinge bracket b1, and an extremity end thereof is linked by a pivot support link p6 to a base part of each scoop plate 13 via a bending link mechanism 17 that is formed from a pair of links that can be bent with respect to each other.
  • opposite ends of the bending link mechanism 17 are linked by pivot support links p4, p5 to the raise/lower tube 12 and each scoop plate 13 via the hinge brackets b2, b3 respectively, and the extremity end of the first hydraulic cylinder Cy1 is linked by a pivot support link p6 to an intermediate part (that is, a pivot support linking part as a bending point) of the bending link mechanism 17.
  • the second hydraulic cylinders Cy2 are placed as a pair on each of the left and the right at positions out of phase with the first hydraulic cylinders Cy1.
  • a base end of the second hydraulic cylinder Cy2 is linked by a pivot support link p7 to an upper part of an outer peripheral wall of the main frame 11 via a hinge bracket b4, and an extremity end thereof is linked by a pivot support link p8 to a lower part of an outer peripheral wall of the raise/lower tube 12 via a hinge bracket b5.
  • Hydraulic oil pressure is supplied while being controlled to the first and second hydraulic cylinders Cy1, Cy2 from a hydraulic control circuit, which is placed on the hull 1 and includes a hydraulic source and a control valve, via a flexible hydraulic pipe extending underwater. Illustration of the hydraulic control circuit and the hydraulic pipe are omitted.
  • the grab bucket G is provided with the sediment flow assistance device A, which assists flow of the sediment 4 heading from the sand discharge pipe P to the sediment collection location 3 via the sediment transport pipe 8 by injecting pressurized air and pressurized water into the sediment 4 pushed into the sand discharge pipe P so as to disperse the sediment 4 within the sand discharge pipe P.
  • the sediment flow assistance device A of the present embodiment includes a large number of air jet nozzles Na placed and fixed facing inward on a peripheral wall of the sand discharge pipe P at intervals in the peripheral and vertical directions, a large number of water jet nozzles Nw similarly placed and fixed facing inward on the peripheral wall of the sand discharge pipe P at intervals in the peripheral and vertical directions, and an air supply pipe Lai and a water supply pipe Lwi supplying pressurized air and pressurized water to the air jet nozzles Na and the water jet nozzles Nw respectively.
  • Each of the air jet nozzles Na and each of the water jet nozzles Nw are disposed so that their jet openings are inclined slightly toward the downstream side (upward in the drawing) in going toward the axis of the pipe within the sand discharge pipe P, and by means of the flow pressure of pressurized air and pressurized water injected therefrom the excavated sediment 4 pushed into the sand discharge pipe P can be efficiently dispersed and efficiently fed under pressure toward the downstream side (that is, toward the sediment transport pipe 8 side).
  • Pluralities of air jet nozzles Na' and water jet nozzles Nw' are placed on and fixed to an outer peripheral part of the hemispherical plate-shaped bottom wall 11b of the main frame 11 at intervals in the peripheral and vertical directions so as to face outward (more specifically, inclined slightly downward in going outward in the radial direction of the sand discharge pipe P).
  • These air jet nozzles Na' and water jet nozzles Nw' are also connected to the air supply pipe Lai and the water supply pipe Lwi respectively.
  • the pressurized air and the pressurized water discharged from the air jet nozzle Na' and the water jet nozzle Nw' are injected into the confined space 40 between the bottom wall 11b of the main frame 11 and the scoop plate 13 in a fully closed state to thus efficiently disperse the excavated sediment 4, scooped into the scoop plate 13, within the scoop plate 13 before being pushed into the sand discharge pipe P and to put it to a state with high flowability, thus enabling it to be efficiently pushed into the sand discharge pipe P.
  • the air jet nozzles Na and the water jet nozzles Nw form first jet means in the sediment flow assistance device A, and the air jet nozzles Na' and the water jet nozzles Nw' form second jet means in the sediment flow assistance device A.
  • Pressurized air and pressurized water are supplied while being controlled to the air supply pipe Lai and the water supply pipe Lwi from an air supply control device, which includes a pressurized air source and an air control valve placed on the hull 1, and a water supply control device, which includes a pressurized water source and a water control valve, via an air pipe Lao and a water pipe Lwo both having flexibility.
  • an air supply control device which includes a pressurized air source and an air control valve placed on the hull 1
  • a water supply control device which includes a pressurized water source and a water control valve
  • the present embodiment illustrates a case in which the first jet means (Na, Nb) of the sediment flow assistance device A injects both pressurized air and pressurized water toward the sediment 4 pushed into the sand discharge pipe P, but the first jet means (Na, Nb) of the sediment flow assistance device A may have a structure in which either one of pressurized air and pressurized water (for example, only pressurized water) is injected toward the sediment 4 pushed into the sand discharge pipe P.
  • the second jet means (Na', Nb') of the sediment flow assistance device A as for the first jet means, that is, either one of pressurized air and pressurized water (for example, only pressurized water) may be injected toward the space 40.
  • a downstream portion of the sediment transport pipe 8 is taken up so as to be taken up and let out by means of a drum device 20 provided on the hull 1 near the sediment collection tank 3.
  • the drum device 20 has a pair of left and right sediment outlet pipes 20a communicating with the downstream end of the sediment transport pipe 8, and sediment transported through the sediment transport pipe 8 is charged into the pair of left and right sediment collection tanks 3 via the two sediment outlet pipes 20a and stored.
  • An intermediate part of the sediment transport pipe 8 let out from the drum device 20 passes through a fore-and-aft direction through hole portion 5ah provided in the support platform 5a of the movable support body 5 and substantially linearly extends forward above a plurality of fourth guide rollers r4 on an upper part of the boom B.
  • the plurality of fourth guide rollers r4 are arranged so that the sediment transport pipe 8 naturally bends downward at the extremity part Ba in particular of the boom B.
  • a convex round face is formed on a bottom face of the through hole portion 5ah of the support platform 5a, the round face naturally guiding the sediment transport pipe 8.
  • the bottom face of the through hole portion 5ah may be covered with a sheet material having a low coefficient of friction for smoothly guiding the sediment transport pipe 8 or provided with a guide roller (not illustrated).
  • hydraulic pipe communicating with the first and second hydraulic cylinders Cy1, Cy2 may be bundled with the air pipe Lao and the water pipe Lwo and extended toward the hull 1 side, or at least part thereof may be individually extended toward the hull 1 side.
  • a main propulsion device 21 propelling the hull 1 in the fore-and-aft direction is provided in a rear part of the hull 1.
  • the main propulsion device 21 includes for example a main screw 21a and a power unit 21u for rotating the main screw 21a.
  • a side thruster 22 for propelling a front part of the hull 1 in the left-and-right direction is provided on a bottom face of a front part of the hull 1.
  • the side thruster 22 includes for example a thrust water jet portion 22a provided in left and right middle parts of the bottom face of the front part of the hull 1, and a high pressure water supply device 22s for supplying high pressure thrust water to the thrust water jet portion 22a.
  • the front part of the hull 1 can be propelled in the left-and-right direction by means of the reaction force of high pressure thrust water injected from the left and right thrust water jet portions 22a of the side thruster 22 toward either one of the left and right sides.
  • the side thruster 22 is not limited to the structure shown in the embodiment in which thrust water is injected laterally, and for example the front part of the hull 1 may be propelled in the left-and-right direction by means of left and right lateral auxiliary screws provided on the left and right sides of the front part of the hull 1.
  • a support post frame 24 that is fixed to the hull 1, one long spud 25 that is vertically slidably supported on the support post frame 24 in a standing attitude and can have its tapered lower end driven into the sediment 4 at the water bottom E and fixed thereto, a spud raise/lower drive device 26 that can raise and lower the spud 25 while maintaining its standing attitude, and a spud fore-and-aft drive device 27 that precisely moves the hull 1 in the fore-and-aft direction within a predetermined stroke range with respect to the spud 25 by pushing in the fore-and-aft direction the spud 25 driven into and fixed to the sediment 4 of the water bottom E.
  • the spud raise/lower drive device 26 is placed on for example the support post frame 24, and has a conventionally known structure that can raise and lower the spud 25 with respect to the hull 1.
  • a structure for example, a structure in which a wire having one end linked to the spud 25 is lifted or suspended by means of a winch device fixed to the hull 1 or the support post frame 24 may be employed.
  • An intermediate part of the spud 25 is inserted into a guide hole 1g that is long in the fore-and-aft direction and provided in the hull 1 so that the spud 25 can slide in the fore-and-aft direction, and an actuator 28 that pushes the spud 25 in the fore-and-aft direction is provided on the hull 1.
  • the actuator 28 has an output arm portion 28a that engages with the spud 25 so that it cannot move in the fore-and-aft direction with respect thereto, and the hull 1 can be moved in the fore-and-aft direction with respect to the spud 25 by means of a reaction to the output arm portion 28a pushing the spud 25 in the fore-and-aft direction.
  • the actuator 28 and the guide hole 1g form the spud fore-and-aft drive device 27 in cooperation with each other.
  • the spud 25, the spud raise/lower drive device 26, and the spud fore-and-aft drive device 27 form in cooperation with each other a spud-type hull propulsion mechanism SP that moves the hull 1 forward and backward precisely by a predetermined amount.
  • the main propulsion device 21, the side thruster 22 and the spud-type hull propulsion mechanism SP form the hull propulsion device D in cooperation with each other, and this hull propulsion device D can propel the hull 1 in the fore-and-aft and left-and-right directions along the water surface in order to adjust the horizontal position of the grab bucket G in the water.
  • the first winch device M1 can raise and lower the grab bucket G by vertically tilting the boom B via the first wire W1
  • the second winch device M2 can raise and lower the grab bucket G via the second wire W2. Therefore, since both the winch devices M1, M2 can function as raise/lower drive means for the grab bucket G in the water, these winch devices M1, M2, the boom B and the second wire W2, from which hang the grab bucket G, and the hull propulsion device D form, in cooperation with each other, drive means K that moves the grab bucket G in the water.
  • a steering system for carrying out steering of the dredger S
  • various types of operating systems (not illustrated), other than the steering system, for operating each section of the dredger S (for example, the main propulsion device 21, the side thruster 22, the spud-type hull propulsion mechanism SP, the first and second winch devices M1, M2, the first and second hydraulic cylinders Cy1, Cy2, etc.) and a control device C that has a microcomputer as a main part and is connected to each of the operating systems.
  • the control device C can control, based on GPS positional information of at least one of the hull 1, the boom B and the grab bucket G, the position of the hull 1 by controlling operation of the hull propulsion device D so that the grab bucket G can move on an excavation target section of the water bottom E along a predetermined excavation route over each predetermined small section (hereinafter, simply called a predetermined section), and a control program that enables the control to be implemented based on an operation input to the operating system is incorporated in advance.
  • a GPS antenna is mounted on the extremity part Ba of the boom B, positional information of the extremity part Ba of the boom B (and consequently positional information of the grab bucket G immediately below the extremity part Ba) is detected based on a GPS signal received by this antenna, operation of the hull propulsion device D is thus controlled, and in this way dredging by the grab bucket G can be carried out with good precision in sequence for each of the predetermined sections, which are formed by dividing the excavation target section into a plurality of sections.
  • the position of the boom extremity part Ba (and consequently positional information of the grab bucket G immediately below the extremity part Ba) is estimated from the positional information of the hull 1 and information about positional deviation between the GPS antenna mounting part of the hull 1 and the boom extremity part Ba, operation of the hull propulsion device D is controlled based on the estimated value, and in this way dredging by the grab bucket G can be carried out with good precision in sequence for each of the predetermined sections, which are formed by dividing the excavation target section into a plurality of sections.
  • the information about positional deviation can be estimated with better precision by taking into consideration the length or the angle of tilting of the boom B (the angle of tilting can be measured directly by an angle sensor or it can be estimated from the amount of the wire W1 taken up by the first winch device M1).
  • the hull 1 is provided with a depth sensor (for example, an ultrasound sensor) 31, which is not illustrated, that can measure the depth of the water bottom E or the depth of the grab bucket G in a non-contact manner, and information detected by the depth sensor 31 is also outputted to the control device C and used for control of the grab bucket G.
  • a depth sensor for example, an ultrasound sensor
  • the dredger S When carrying out dredging, first, the dredger S is steered and made to travel by itself to a dredging water area, and in this process the boom B is retained at a standby position (for example, position X or position Y in FIG. 1 ) above water.
  • a standby position for example, position X or position Y in FIG. 1
  • the spud 25 is lowered and driven into and fixed to the water bottom E.
  • the hull 1 is retained in advance at a predetermined backward limit within the guide hole 1g with respect to the spud 25 by means of the spud fore-and-aft drive device 27. Turning of the hull 1 around the spud 25 is suppressed by adjustment of the flow of water in the left and right directions that is injected from the thrust water jet portion 22a of the side thruster 22.
  • the pair of scoop plates 13 are fully opened by compressing the first hydraulic cylinder Cy1 and the raise/lower tube 12 is lowered to a lower limit with respect to the main frame 11 by extending the second hydraulic cylinder Cy2.
  • the two scoop plates 13 bite into sediment at the water bottom E as shown in FIG. 7
  • the two scoop plates 13 are forcibly pivoted in the closing direction as shown in FIG. 8 (a) to (b) by means of the first hydraulic cylinder Cy1, thus allowing the water bottom sediment to be scooped up and excavated into the two scoop plates 13.
  • pressurized air and pressurized water are injected via the air jet nozzles Na, Na' and the water jet nozzles Nw, Nw' respectively of the sediment flow assistance device A.
  • the pressurized air and the pressurized water flow from the sand discharge pipe P only to the sediment transport pipe 8 side in particular when the two scoop plates 13 are closed, and are utilized for transport of excavated sediment that heads upward (that is, to the sediment collection tank 3 side) within the sediment transport pipe 8.
  • Sediment immediately after being pushed into the sand discharge pipe P is smoothly fed under pressure and made to flow toward the upstream side, that is, the sediment transport pipe 8 side, via the check valve 15 while being assisted by the jet pressure of pressurized air and pressurized water from the air jet nozzle Na and the water jet nozzle Nw.
  • the excavated sediment 4 pushed into the sand discharge pipe P is fed under pressure into the sediment collection tank 3 of the hull 1 via the sediment transport pipe 8 by utilizing the jet pressure of pressurized air and pressurized water and stored. Repeating such an excavation cycle several times completes dredging for one predetermined section of the water bottom E.
  • the hull 1 is turned around the spud 25 only by a predetermined small angle by adjustment of the flow of water in the left-and-right direction injected from the thrust water jet portion 22a of the side thruster 22, and the hull 1 is stopped at the turned position.
  • the spud 25 is then pushed in the fore-and-aft direction by means of the spud fore-and-aft drive device 27 so as to move the hull 1 forward or backward by a predetermined amount at a time, and during this process the same excavation cycle as described above is repeated, thus carrying out dredging for a next predetermined section that is adjacent to the previous predetermined section.
  • the hull 1 When dredging of one excavation target section is completed, the hull 1 is moved to a next excavation target section. During this movement, the spud 25 is first pulled up from the water bottom E, after that the hull 1 is moved forward or backward by a predetermined distance by means of the main propulsion device 21, and the spud 25 is then again driven into and fixed to the water bottom E.
  • dredging is carried out in sequence for each of predetermined sections of the next excavation target section.
  • the history of positional information about the extremity part Ba of the boom B (and consequently the grab bucket G immediately below the extremity part Ba) is all stored in a storage part of the control device C, and it is therefore possible to omit dredging of a predetermined section that is estimated from the positional information history to overlap a prior (that is, already dredged) predetermined section and to shift to a next predetermined section.
  • the grab bucket G can dredge a wide range of the water bottom E as an excavation target via the above process.
  • the boom B axially supported on the hull 1 is formed so as to be tiltable in the vertical direction not only above the water but also underwater.
  • the second wire W2 let out from the second winch device M2 on the hull 1 hangs down from the extremity part Ba of the boom B in the water during the dredging process, thus enabling the grab bucket G to be suspended.
  • the dredger S of the present embodiment in particular includes the hull propulsion device D, which can propel the hull 1 along the water surface in order to adjust the horizontal position of the grab bucket G in the water, and the control device C which controls operation of the hull propulsion device D.
  • the control device C controls the position of the hull 1 by operating the hull propulsion device D based on GPS positional information of at least one of the hull 1, the boom B and the grab bucket G, thus enabling the grab bucket G to be moved by a predetermined section at a time along a predetermined excavation route in an excavation target section of the water bottom E.
  • the dredged sediment 4 can be stored in the dredger S itself without having a barge alongside the dredger S and on standby. This enables dredging to be continued for example when there is no barge on standby, and also when the grab bucket G, etc. malfunctions and dredging is discontinued, sediment that has been stored within the sediment collection tank 3 during dredging up to that time can be transshipped to a barge, thus increasing the overall operating efficiency.
  • the pair of scoop plates 13 are axially supported p2 at the lower end of the raise/lower tube 12, which can be raised and lowered with respect to the main frame 11, the scoop plates 13 being able to swing in order to open and close, and the excavated sediment 4 scooped up into the two scoop plates 13 is forcibly pushed into the sand discharge pipe P by raising the raise/lower tube 12 with respect to the main frame 11 in a state in which the two scoop plates 13 are closed.
  • the function of scooping up (that is, excavating) water bottom sediment is carried out by the scoop plate 13,
  • the function of pushing the scooped sediment into the sand discharge pipe P is mainly carried out by the raise/lower tube 12, and it is therefore possible to design the scoop plate 13 and the raise/lower tube 12 optimally so as to fit their respective functions, thereby enhancing the degree of freedom in design overall. Since the amount of scooped sediment pushed into the sand discharge pipe P is determined by the raise/lower stroke of the raise/lower tube 12, it is possible to ensure that a sufficient amount is pushed in without especially increasing the size of the scoop plate 13 or increasing the stroke in the open/close direction.
  • the bottom wall 11b of the main frame 11 is formed into a hemispherical surface protruding downward, and one end Pi of the sand discharge pipe P opens on the central apex part of the bottom wall 11b.
  • the pair of scoop plates 13 in a closed state have a hemispherical plate form corresponding to the hemispherical shape of the bottom wall 11b, and in a state in which the raise/lower tube 12 attains the upper limit the space 40 between the inner faces of the two scoop plates 13 and the lower face of the bottom wall 11b is sufficiently confined, that is, the two scoop plates 13 are closely opposing the lower face of the bottom wall 11b. This enables the excavated sediment scooped up into the pair of scoop plates 13 to be efficiently and evenly pushed into the sand discharge pipe P, thus enhancing the efficiency with which it is pushed in.
  • the sediment can be sufficiently dispersed to thus enhance the flowability, and the flow of sediment from the sand discharge pipe P toward the sediment collection tank 3 via the sediment transport pipe 8 can be sufficiently assisted.
  • the jet pressure of pressurized air and pressurized water for dispersing sediment can be used effectively as pressure for transporting sediment within the sediment transport pipe 8. This enables the efficiency with which sediment is fed under pressure through the sand discharge pipe P and the sediment transport pipe 8 to be enhanced effectively.
  • FIG. 10 to FIG. 12 show a second embodiment of the present invention, which is different from the first embodiment only in terms of the structure of the grab bucket. That is, in the first embodiment the main frame 11 of the grab bucket G has a cylindrical shape, the bottom wall 11b has a hemispherical plate shape, the raise/lower tube 12 also has a cylindrical shape, and the pair of scoop plates 13, 13 have a form that becomes a hemispherical plate shape in a closed state (that is, a form in which a hemispherical plate is equally divided into two), whereas in the second embodiment a main frame 11' of a grab bucket G' has an angular tubular shape having a rectangular cross section (more specifically a square), a bottom wall 1 1b' thereof has a semi-cylindrical shape, a raise/lower tube 12' also has an angular tubular shape having a rectangular cross section (more specifically a square), and a pair of scoop plates 13', 13' have a form that becomes a
  • the structure of the second embodiment is otherwise the same as that of the first embodiment, and constituent elements of the second embodiment are denoted by the same reference numerals and symbols as those of the corresponding constituent elements of the first embodiment, further explanation being omitted.
  • the embodiments illustrate a case in which the hull propulsion device D includes the spud-type hull propulsion mechanism SP in addition to the main propulsion device 21 and the side thruster 22, the hull 1 is moved forward and backward by a predetermined amount at a time by means of the spud-type hull propulsion mechanism SP, the hull 1 is turned and pivoted by means of the side thruster 22 over a predetermined angle at a time with the spud 25 as a center, and the bucket device V can move and dredge a predetermined section at a time of a fan-shaped or annular excavation target section of the water bottom E.
  • operation of the main propulsion device 21 and the side thruster 22 may be controlled based on GPS positional information of at least one of the hull 1, the boom B and the grab bucket G so as to move the hull 1 by a predetermined amount at a time forward, backward or laterally in either one of left and right directions, thus making it move and dredge a predetermined section at a time along a predetermined excavation route in an excavation target section of the water bottom E.
  • the side thruster 22 is not only disposed in a front part of a bottom part of the hull 1 as in the embodiments but also disposed in a rear part of the bottom part of the hull 1.
  • the embodiments illustrate a case in which, when carrying out dredging, operation of the hull propulsion device D is controlled based on GPS positional information of at least one of the hull 1, the boom B and the grab bucket G so as to control the position of the hull 1, but instead of or in addition to the GPS positional information, operation of the hull propulsion device D may be controlled based on positional information from another position sensor that can detect the hull position, thus carrying out control of the position of the hull 1.
  • the embodiments illustrate a case in which excavated sediment is fed under pressure into the sediment collection tank 3 of the hull 1 via the sediment transport pipe 8 by utilizing the jet pressure of pressurized air and pressurized water from the sediment flow assistance device A provided on the grab bucket G (for example, the sand discharge pipe P), but in addition to the sediment flow assistance device A, for example, jet pump means (JP) shown in FIG. 2 of Japanese Patent Application Laid-open No. 2008-115610 may be disposed partway along the sediment transport pipe 8, thus assisting the flow of sediment within the sediment transport pipe 8.
  • JP jet pump means
  • the jet pressure of pressurized air and pressurized water from the jet pump means is also utilized for feeding sediment under pressure within the sediment transport pipe 8, and it therefore becomes possible to more efficiently feed excavated sediment under pressure into the sediment collection tank 3 of the hull 1.
  • the embodiments illustrate a case in which when the dredging water area is distant the dredger S is steered so as to travel by itself to the dredging water area, but in such a case the dredger S may be towed by another ship and moved to the dredging water area.
  • the embodiments illustrate a case in which the sediment collection location above the water is the sediment collection tank 3 provided in the hull 1 of the dredger S, but the sediment collection location may be a sediment collection tank placed on another ship (for example, a barge) different from the dredger S, or a floating facility.
  • the first embodiment illustrates a case in which the bottom wall 11b of the main frame 11 is formed into a hemispherical plate shape
  • the second embodiment illustrates a case in which the bottom wall 11b' of the main frame 11' is formed into a hemispherical plate shape
  • the bottom wall shape of the main frame is not limited to those of the embodiments, and it may be formed into an appropriate shape according to the shape of the pair of scoop plates in a closed state, for example, a horizontal flat plate shape.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)

Claims (5)

  1. Drague comprenant une coque (l), un dispositif à godets (G, G') qui peut ramasser et excaver des sédiments sur un fond d'eau (E), un moyen d'entraînement (K) qui est prévu entre le dispositif à godets (G, G') et la coque (1) et déplace le dispositif à godets (G, G') sous l'eau, et un tuyau de transport de sédiments (8) qui transporte un sédiment (4) excavé par le dispositif à godets (G, G) vers un emplacement de collecte de sédiments (3) au-dessus de l'eau,
    caractérisé en ce que le dispositif à godets (G, G') comprend un cadre principal tubulaire à fond (11, 11') qui est relié et supporté par les moyens d'entraînement (K) et peut être entraîné horizontalement et verticalement. sous l'eau, un corps de soulèvement/d'abaissement (12, 12') qui est formé sous une forme tubulaire ayant des extrémités supérieure et inférieure ouvertes et est monté de manière coulissante verticale autour d'une périphérie externe du cadre principal (11, 11'), une paire de plaques d'excavation (13, 13') qui sont supportées axialement sur les parties d'extrémité inférieures du corps de soulèvement/d'abaissement (12, 12') de sorte que les sédiments au fond de l'eau (E) puissent être récupérés en ouvrant et en fermant l'extrémité inférieure ouverte du corps de soulèvement/d'abaissement (12, 12'), un dispositif d'entraînement d'ouverture/fermeture (Cy1) qui entraîne les deux plaques d'excavation (13, 13') pour s'ouvrir et se fermer, un dispositif d'entraînement de soulèvement/d'abaissement (Cy2) qui entraîne le corps de soulèvement/d'abaissement (12, 12') pour qu'il s'élève et s'abaissé par rapport au châssis principal (11, 11'), un tuyau d'évacuation de sable (P) qui est fixé à l'intérieur du châssis principal (11, 11') de manière à avoir une extrémité (Pi) débouchant sur une paroi inférieure (11b, 11b') du cadre principal (11, 11') et avoir l'autre extrémité (PO) reliée à une extrémité amont du tuyau de transport de sédiments (8), et un clapet anti-retour (15) qui empêche l'écoulement inverse des sédiments (4) poussés hors du tuyau d'évacuation de sable (P) vers le côté du tuyau de transport de sédiments (8),
    les sédiments excavés (4) par la paire de plaques d'excavation (13, 13') étant poussés de force dans le tuyau d'évacuation du sable (P) du fait que le corps de soulèvement/d'abaissement (12, 12') est entraîné pour s'élever par rapport au châssis principal (11, 11') dans un état dans lequel la plaque d'excavation (13, 13') est fermée.
  2. Drague selon la revendication 1, dans laquelle le châssis principal (11, 11') a une paroi inférieure (11b, 11b') formée comme une face incurvée convexe vers le bas, et ladite une extrémité (Pi) du tuyau d'évacuation du sable (P) débouche sur une partie centrale de la paroi inférieure (11b, 11b').
  3. Drague selon la revendication 1, dans laquelle le dispositif à godets (G, G) est pourvu d'un dispositif d'assistance à l'écoulement des sédiments (A) qui injecte de l'air sous pression et/ou de l'eau sous pression vers les sédiments excavés (4) poussés dans le tuyau d'évacuation de sable (P) de manière à disperser les sédiments (4) à l'intérieur du tuyau d'évacuation de sable (P) et à faciliter l'écoulement des sédiments (4) depuis le tuyau d'évacuation de sable (P) vers l'emplacement de collecte de sédiments (3) via le conduite de transport de sédiments (8).
  4. Drague selon la revendication 3, dans laquelle le dispositif d'assistance à l'écoulement des sédiments (A) comprend des premiers moyens à jet (Na, Nw) qui injectent de l'air sous pression et/ou de l'eau sous pression vers les sédiments excavés (4) poussés dans le tuyau d'évacuation de sable (P), et des deuxièmes moyens à jet (Na', Nw') qui peuvent injecter de l'air sous pression et/ou de l'eau sous pression dans un espace (40) entre la paire de plaques d'excavation (13, 13') dans un état fermé et la paroi inférieure (11b, 11b').
  5. Drague selon l'une quelconque des revendications 1 à 4, dans laquelle la coque (l) est dotée d'un réservoir de collecte de sédiments (3) qui devient l'emplacement de collecte de sédiments.
EP20822136.6A 2019-06-12 2020-06-09 Bateau de travail de dragage Active EP3985176B1 (fr)

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PCT/JP2020/022681 WO2020250886A1 (fr) 2019-06-12 2020-06-09 Bateau de travail de dragage

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CN116114430B (zh) * 2023-03-30 2024-10-11 汶上县林业保护和发展服务中心 一种果树种植挖坑装置及其使用方法

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Publication number Priority date Publication date Assignee Title
US2952083A (en) * 1956-07-27 1960-09-13 John H Forkner Dredge construction
US3693274A (en) * 1970-09-10 1972-09-26 Ugo Piccagli Clam shell excavator
FR2622910B1 (fr) * 1987-11-05 1992-02-28 Soletanche Benne excavatrice a godets
JPH0274730A (ja) * 1988-09-09 1990-03-14 Iwakuragumi Doken Kk 無濁浚渫装置
JPH083188B2 (ja) 1993-07-15 1996-01-17 株式会社小島組 グラブ揚土装置
US5540005A (en) * 1995-07-21 1996-07-30 Lynch; Robert P. Contaminated marine sediments dredging apparatus
WO2001071106A1 (fr) 2000-03-21 2001-09-27 Warren Howard Chesner Système de dragage sécurisé et cuve de traitement d'eau
JP4713930B2 (ja) * 2005-01-07 2011-06-29 大成建設株式会社 浚渫装置
JP4808496B2 (ja) * 2005-01-27 2011-11-02 西松建設株式会社 浚渫装置及び浚渫方法
JP4875461B2 (ja) 2006-11-06 2012-02-15 株式会社小島組 浚渫装置
CN107059970B (zh) * 2016-11-11 2019-12-06 浙江双林环境股份有限公司 一种湖泊淤泥的清理装置及其清理方法
CN109469143A (zh) * 2017-09-08 2019-03-15 南京恒嘉坤科技有限公司 一种低扰动水下疏浚系统和方法

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CN113950553B (zh) 2023-03-07
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JPWO2020250886A1 (fr) 2020-12-17
EP3985176A1 (fr) 2022-04-20

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