Underground railway track for linking Cologne-Bonn airport
E. Heitkamp GmbH
Wayss & Freytag Ingenieurbau GmbH
Bauer Spezialtiefbau GmbH
F.C. Trapp AG
Dewatering with 24-h pump duty by:
Smet GWT N.V., Dessel, Belgium
Biergans Pumpen-Vertrieb GmbH, Duisburg
Pumping off the water arising during underground tunnel heading, lowering the ground water level over a large area.
Deep wells were built in the area in which submersible waste water pump were installed. This allowed to lower the ground-water table to the lowest possible level.