Knoop Baggerwerken on the Dutch Delta of the Waddenzee

Knoop Baggerwerken has send an amphibious excavators and operators to Nieuwstad, Groningen. The aim of the project was to expand the channel Eemshaven-North Sea.

The material that was released during the excavation process, of which boulder clay was a part, has been re-used to create a bird nesting island to compensate the channel that is situated between the Eemshaven and Delfzijl.

The challenge here was to work with high and low tide. This calls for good preparations, anticipation and experience to execute this project with succes. The crew worked in shifts to be able to work on-site 24/7.

The amphibious excavator has no problem crossing the water nor the mud flats to make its way to the island. A spray pipe pontoons installed and attached to a tube. The pontoon lies between the anchors. The spray pipe pontoon will be connected to the hopper that will arrive approximately every 4 hours with the sand from the channel. Then it will spread the sand from left to right to build up the island. This way the island will keep growing. The amphibious excavator makes sure that the spray pipe pontoon will stay free of sand and that the sandpile behind the tube stays even. By doing this the water will be able to flow off the plate. The machine also removes the anchors when needed. As a result the island can be built layer by layer. This type of circumstances demands an amphibious excavator that can handle water and also landscapes with complex weigth-bearing capacity. The first part of the project has ended successfully and the island is now ready to be discovered by the birds.


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