Floating Clamshell Dredges

ROHR-IDRECO floating clamshell dredges are designed to extract sand and gravel from 10 to 60 or even 90 meters below water level. All dredges 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:

  • traveling 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: 5.98 y³
  • Carrying capacity: 20 st
  • Installed lifting capacity: 295-335 hp
  • Working Velocities:
    • Lifting speed: 246-360 ft/min
    • Lowering speed: 16-524 ft/min
  • Dredging depth: 32-328 ft / 590 ft (rope grab)

RS 6,0/220 Pf

  • Grab capacity: 7.17 y³
  • Carrying capacity: 24 st
  • Installed lifting capacity: 350-395 hp
  • Working Velocities:
    • Lifting speed: 246-360 ft/min
    • Lowering speed: 16-524 ft/min
  • Dredging depth: 32-328 ft / 590 ft (rope grab)

RS 7,0/240 Pf

  • Grab capacity: 8.37 y³
  • Carrying capacity: 26 st
  • Installed lifting capacity: 482-536 hp
  • Working Velocities:
    • Lifting speed: 246-360 ft/min
    • Lowering speed: 16-524 ft/min
  • Dredging depth: 32-328 ft / 590 ft (rope grab)

RS 8,0/280 Pf

  • Grab capacity: 9.56y ³
  • Carrying capacity: 30 st
  • Installed lifting capacity: 536-670 hp
  • Working Velocities:
    • Lifting speed: 246-360 ft/min
    • Lowering speed: 16-524 ft/min
  • Dredging depth: 32-328 ft / 590 ft (rope grab)

RS 10/340 Pf

  • Grab capacity: 11.95y ³
  • Carrying capacity: 37 st
  • Installed lifting capacity: 644-670 hp
  • Working Velocities:
    • Lifting speed: 246-360 ft/min
    • Lowering speed: 16-524 ft/min
  • Dredging depth: 32-328 ft / 590 ft (rope grab)

RS 12/450 Pf

  • Grab capacity: 14.35 y³
  • Carrying capacity: 50 st
  • Installed lifting capacity: 697-845 hp
  • Working Velocities:
    • Lifting speed: 246 – 360 ft / 590 ft (rope grab)
    • Lowering speed: 32-328 ft / 590 ft (rope grab)
  • Dredging depth: 16.5 – 525 ft / 590 ft (rope grab)

RS 15/550 Pf

  • Grab capacity: 17.94 y³
  • Carrying capacity: 60 st
  • Installed lifting capacity: 1019-1072 hp
  • Working Velocities:
    • Lifting speed: 246-360 ft/min
    • Lowering speed: 16-524 ft/min
  • Dredging depth: 32-328 ft / 590 ft (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:

  • Traveling 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: 246 – 360 ft/min
    • Lowering speed: 16 – 524 ft/min
  • Dredging depth: 32 – 328 / 590 ft (rope grab)

RS 5,0/180 Pf

  • Grab capacity: 6 y³
  • Carrying capacity: 20 st
  • Installed lifting capacity: 295-335 hp

RS 6,0/220 Pf

  • Grab capacity: 7.17 yd³
  • Carrying capacity: 24 st
  • Installed lifting capacity: 348-388 hp

RS 7,0/240 Pf

  • Grab capacity: 8.37 y³
  • Carrying capacity: 26 st
  • Installed lifting capacity: 482-536 hp

RS 8,0/280 Pf

  • Grab capacity: 9.56 y³
  • Carrying capacity: 30 st
  • Installed lifting capacity: 536-670 hp

RS 10/340 Pf

  • Grab capacity: 11.96 y³
  • Carrying capacity: 37 st
  • Installed lifting capacity: 26-845 hp

RS 12/450 Pf

  • Grab capacity: 14.35 yd³
  • Carrying capacity: 49 st
  • Installed lifting capacity: 697 – 844 HP

RS 15/550 Pf

  • Grab capacity: 17.94 y³
  • Carrying capacity: 60 st
  • Installed lifting capacity: 965-1,072 hp
Image

Closed design

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

All dredges have:

  • Traveling 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: 246-260 ft/min
    • Lowering speed: 16-524 ft/min
  • Dredging depth:32-328 ft / 590 ft (rope grab)

RS 4,0/4,2 /140 Bf

  • Grab capacity: 5.02 y³
  • Carrying capacity: 15 st
  • Installed lifting capacity: 200-268- hp

RS 5,0/180 Bf

  • Grab capacity: 5.98 y³
  • Carrying capacity: 20 st
  • Installed lifting capacity: 350-390 hp

RS 6,0/220 Bf

  • Grab capacity: 7.17 y³
  • Carrying capacity: 24 st
  • Installed lifting capacity: 350-390 hp

RS 7,0/240 Bf

  • Grab capacity: 8.37 y³
  • Carrying capacity: 26 st
  • Installed lifting capacity: 482-536 hp

RS 8,0/280 Bf

  • Grab capacity: 9.56 y³
  • Carrying capacity: 31 st
  • Installed lifting capacity: 590-670 hp

RS 10/340 Bf

  • Grab capacity: 11.95 y³
  • Carrying capacity: 37 st
  • Installed lifting capacity: 644-670 hp

RS 12/450 Bf

  • Grab capacity: 14.35 y³
  • Carrying capacity: 50 st
  • Installed lifting capacity: 697-845 hp

RS 15/550 Bf

  • Grab capacity: 17.94 y³
  • Carrying capacity: 60 st
  • Installed lifting capacity: 965-1072 hp
Image

Luffing jib design

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

All dredges 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: 5.02 y³
  • Carrying capacity: 15 st
  • Installed lifting capacity: 268 HP
  • Working Velocities:
    • Lifting speed: 246 – 360 ft/min
    • Lowering speed: 16 – 524 ft/min
  • Dredging depth: 31 – 197 ft

RS 4,0/140 Af

  • Grab capacity: 5.98 y³
  • Carrying capacity: 19 st
  • Installed lifting capacity: 335 HP
  • Working Velocities:
    • Lifting speed: 246 – 360 ft/min
    • Lowering speed: 16 – 524 ft/min
  • Dredging depth: 32 – 197 ft

RS 5,0/180 Af

  • Grab capacity: 7.17 y³
  • Carrying capacity: 24 st
  • Installed lifting capacity: 430 HP
  • Working Velocities:
    • Lifting speed: 246 – 360 ft/min
    • Lowering speed: 16 – 524 ft/min
  • Dredging depth: 32 – 197 ft

RS 6,0/220 Af

  • Grab capacity: 7.17 y³
  • Carrying capacity: 24 st
  • Installed lifting capacity: 422  -536 HP
  • Working Velocities:
    • Lifting speed: 246-360 ft/min
    • Lowering speed: 16-524 ft/min
  • Dredging depth: 32-197 ft