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Baggeren

Dredging

During the dredging process, the suction pipe is jettisoned using three hydraulically controlled cranes. The suction pipe is also made up of three parts, which are flexibly interconnected by a guide frame.

The front piece, the so-called curve piece, is curved and equipped with a mounting plate that is attached to the ship's shell using clamps and dips into the shell just in front of the pump hole.

The centre piece is the heaviest part, because it is made up of a dredge pump, electric motor, and pump pipe. The pump and its motor alone weigh as much as approx. 40 tonnes.

The drag head part comprises a swivel, suction pipe, and drag head which is dragged across the seabed. This configuration of an underwater dredge pump incorporated into the suction pipe allows the Reimerswaal to dredge at depths of down to 60 metres, with greater depths also possible with a few adjustments.

As soon as the dredging has started, the sand/gravel mixture is pumped into a sieve tank. This sieve tank can be equipped with sieves that can sieve out various grain sizes, while it also offers a choice of whether or not to deposit the material that goes through the sieve mesh in the ship's hold.

As soon as the mixture has settled in the hopper, a drainage system is used to dry discharge the material using the selected unloading system. The entire process is controlled and monitored by one person on the ship's bridge. The bridge has for that purpose been equipped with a so-called multi-command chair, from which the captain or navigating officer can both run the dredging process and navigate the ship.

He also disposes of a so-called Dynamic Positioning system, which enables fully automated controlling of the ship's course and position.

This combination of systems makes the Reimerswaal a multifunctional vessel that can also be used for trench dredging or precision rock fill discharging.

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