Floating Clamshell Dredgers

ROHR-IDRECO floating clamshell dredgers are designed to extract sand and gravel from 10 to 60 or even 90 metres below water level. All dredgers are custom-built to the requirements of each deposit and the needs of every customer. Customers can choose among various components for on-board processing, such as double or single-deck screening machines, crushers, fine sand recovery, conveyor belts or hydraulic transportation to site. Two types of hydraulic motor grabs manufactured in-house complete the package and make the dredger an efficient tool for every purpose.

Image

Catamaran with processing plant

  • dewatering machine
  • fine sand recovery
  • tilting- or rake grid
  • transport by floating conveyer belts
Learn more
Open product info

All dredgers have:

  • travelling hoisting gear
  • hoist winch with two or four ropes
  • hoist winch with frequency controlled motors, dimensioning depending on dredging depth
  • motor-hydraulic-clamshell grab or rope clamshell grab

RS 5,0/180 Pf

  • Grab capacity: 5 m³
  • Carrying capacity: 18 to
  • Installed lifting capacity: 220-250 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 100 m / 180 m (rope grab)

RS 6,0/220 Pf

  • Grab capacity: 6 m³
  • Carrying capacity: 22 to
  • Installed lifting capacity: 260 – 290 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 100 m / 180 m (rope grab)

RS 7,0/240 Pf

  • Grab capacity: 7 m³
  • Carrying capacity: 24 to
  • Installed lifting capacity: 360 – 400 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 100 m / 180 m (rope grab)

RS 8,0/280 Pf

  • Grab capacity: 8 m³
  • Carrying capacity: 28 to
  • Installed lifting capacity: 400 – 500 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 100 m / 180 m (rope grab)

RS 10/340 Pf

  • Grab capacity: 10 m³
  • Carrying capacity: 34 to
  • Installed lifting capacity: 440 – 500 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 100 m / 180 m (rope grab)

RS 12/450 Pf

  • Grab capacity: 12 m³
  • Carrying capacity: 45 to
  • Installed lifting capacity: 520 – 630 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 100 m / 180 m (rope grab)

RS 15/550 Pf

  • Grab capacity: 15 m³
  • Carrying capacity: 55 to
  • Installed lifting capacity: 720 – 800 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 100 m / 180 m (rope grab)
Image

Catamaran with automatic barge loading

  • Unmanned barge loading by means of vast sensor technology
  • Automatic barge hauling during the loading process for proper weight displacement
  • Monitoring of dredging process possible from the operator’s cabin
Learn more
Open product info

All dredgers have:

  • Travelling hoisting gear
  • Hoist winch with two or four ropes
  • Hoist winch with frequency controlled motors, dimensioning depending on dredging depth
  • Motor-hydraulic-clamshell grab or rope clamshell grab
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 100 m / 180 m (rope grab)

RS 5,0/180 Pf

  • Grab capacity: 5 m³
  • Carrying capacity: 18 to
  • Installed lifting capacity: 220 – 250 kW

RS 6,0/220 Pf

  • Grab capacity: 6 m³
  • Carrying capacity: 22 to
  • Installed lifting capacity: 260 – 290 kW

RS 7,0/240 Pf

  • Grab capacity: 7 m³
  • Carrying capacity: 24 to
  • Installed lifting capacity: 360 – 400 kW

RS 8,0/280 Pf

  • Grab capacity: 8 m³
  • Carrying capacity: 28 to
  • Installed lifting capacity: 400 – 500 kW

RS 10/340 Pf

  • Grab capacity: 10 m³
  • Carrying capacity: 34 to
  • Installed lifting capacity: 440 – 500 kW

RS 12/450 Pf

  • Grab capacity: 12 m³
  • Carrying capacity: 45 to
  • Installed lifting capacity: 520 – 630 kW

RS 15/550 Pf

  • Grab capacity: 15 m³
  • Carrying capacity: 55 to
  • Installed lifting capacity: 720 – 800 kW
Image

Closed design

  • Dewatering machine
  • Fine sand recovery
  • Tilting- or rake grid
  • Transport by floating conveyor belts
Learn more
Open product info

All dredgers have:

  • Travelling hoisting gear
  • Hoist winch with two or four ropes
  • Hoist winch with frequency controlled motors, dimensioning depending on dredging depth
  • Motor-hydraulic-clamshell grab or rope clamshell grab
  • Working Velocities:
    • Lifting speed: 75-110 m/min
    • Lowering speed: 5-160 m/min
  • Dredging depth: 10-100m / 180 m (rope grab)

RS 4,0/4,2 /140 Bf

  • Grab capacity: 4,2 m³
  • Carrying capacity: 14 to
  • Installed lifting capacity: 150 – 200 kW

RS 5,0/180 Bf

  • Grab capacity: 5 m³
  • Carrying capacity: 18 to
  • Installed lifting capacity: 220 – 250 kW

RS 6,0/220 Bf

  • Grab capacity: 6 m³
  • Carrying capacity: 22 to
  • Installed lifting capacity: 260 – 290 kW

RS 7,0/240 Bf

  • Grab capacity: 7 m³
  • Carrying capacity: 24 to
  • Installed lifting capacity: 360 – 400 kW

RS 8,0/280 Bf

  • Grab capacity: 8 m³
  • Carrying capacity: 28 to
  • Installed lifting capacity: 400 – 500 kW

RS 10/340 Bf

  • Grab capacity: 10 m³
  • Carrying capacity: 34 to
  • Installed lifting capacity: 440 – 500 kW

RS 12/450 Bf

  • Grab capacity: 12 m³
  • Carrying capacity: 45 to
  • Installed lifting capacity: 520 – 630 kW

RS 15/550 Bf

  • Grab capacity: 15 m³
  • Carrying capacity: 55 to
  • Installed lifting capacity: 720 – 800 kW
Image

Luffing jib design

  • Dewatering machine
  • Fine sand recovery
  • Tilting- or rake grid
  • Transport by floating conveyor belts
Learn more
Open product info

All dredgers have:

  • Stationary hoisting gear
  • Hoist winch with two or four ropes
  • Hoist winch with frequency controlled motors, dimensioning depending on dredging depth
  • Motor-hydraulic-clamshell grab or rope clamshell grab

RS 3,2/110 Af

  • Grab capacity: 3,2 m³
  • Carrying capacity: 11 to
  • Installed lifting capacity: 180 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 60 m

RS 4,0/140 Af

  • Grab capacity: 4,2 m³
  • Carrying capacity: 14 to
  • Installed lifting capacity: 220 – 250 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 60 m

RS 5,0/180 Af

  • Grab capacity: 5 m³
  • Carrying capacity: 18 to
  • Installed lifting capacity: 220 – 250 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 60 m

RS 6,0/220 Af

  • Grab capacity: 6 m³
  • Carrying capacity: 22 to
  • Installed lifting capacity: 315 – 400 kW
  • Working Velocities:
    • Lifting speed: 75 – 110 m/min
    • Lowering speed: 5 – 160 m/min
  • Dredging depth: 10 – 60m