VASCO DA GAMA BRIDGE
In the summer of 1996 Trevi Fundacoes reached out to KB because they were experiencing uncontrolled fluid loss while drilling on the Vasco da Gama Bridge in Lisbon, Portugal. Trevi had used a low cost polyacrylamide polymer on the method piles. KB recognized that the reasons for the fluid loss were a combination of salt water intrusion in the piles, completely saturated sandy alluvial layers and a porous layer of gravel and cobbles at 50 meters.
KB’s SlurryPro CDP system allowed Trevi to use salt water for slurry make-up on a barge and drill through the problematic zones without fluid loss while maintaining viscosity. A total of 272 piles were excavated to depths of 75 meters. The ten mile bridge over the Tagus River and supporting viaducts was a great success.
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