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.
Highest efficiency
Our advanced automation and monitoring software, developed in-house, ensures the highest efficiency and the lowest possible energy consumption.

Low carbon footprint
The ROHR-IDRECO dredgers are electric driven (diesel/diesel-electric drives are optional). This ensures the highest efficiency and the lowest possible energy consumption.

Clamshell Dredger series
Grab capacity |
5-15 m3 |
Carrying capacity |
18-55 t |
Lifting speed under water |
110-120 m/min |
Lifting speed above water |
75-90 m/min |
Lowering speed above water |
75-120 m/min |
Lowering speed under water |
150-180 m/min |
Dredging depth hydraulic grab
|
10-100 m / 180 m (rope grab) |
Grab capacity |
4.2-12 m3 |
Carrying capacity |
14-45 t |
Lifting speed under water |
110-120 m/min |
Lifting speed above water |
75-90 m/min |
Lowering speed above water |
75-120 m/min |
Lowering speed under water |
150-180 m/min |
Dredging depth hydraulic grab
|
10-100 m / 180 m (rope grab) |
Grab capacity |
4.2-6 m3 |
Carrying capacity |
14-22 t |
Lifting speed above water |
70-90 m/min |
Lowering speed above water |
70-120 m/min |
Lowering speed under water |
70-160 m/min |
Dredging depth
|
10-60 m |

Your benefits
Electric-driven
No emission, minimal noise pollution
One-man operation
With our iDredge® control- and automation system
Containerized
Low-cost transportation worldwide
Environment
Small environmental footprint
Commitment
Lifetime supply of parts and services
Full customization
iPump® type, excavating grinders and visualisation
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