Den Bosch: clean-up of cofferdam

Contractor Heijmans has been commissioned by the municipality of ’s-Hertogenbosch to construct a new underground car park. The car park will have capacity for more than one thousand cars and will be built on the Vonk & Vlam site, on the outskirts of ’s-Hertogenbosch. Contractor ‘Martens and Van Oord’ has been requested to excavate the construction pit to a depth of approximately fourteen metres. Now that all of the soil has been removed, waterproof concrete must be poured in – however, the sludge generated during the excavation process first needs to be removed.

Remote monitoring
The sludge is routed to Geotubes® for dewatering. Before the sludge is pumped into these units, it is treated with coagulant and flocculant. This completely automated process was performed by a subsidiary of Promeco. Ton Broeders: “We analysed the content of the dredging pipes and dosed the coagulant and flocculant. We have remotely monitored the dosing: we analysed and optimized where necessary. In this way, ‘Martens and Van Oord’ has dewatered thousands of cubic metres. The return water is routed back to the construction pit and the sludge was removed for re-use.”

Client: Contractor ‘Martens en Van Oord’

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