|Owner||DC Water and Sewer Authority|
|Design Builder and Construction Manager||Skanska-Jay Dee Joint Venture|
|Geotechnical Engineer||Parsons Brinckerhoff|
|Structural Engineer||Parsons Brinckerhoff|
The slurry wall was constructed using the tremie concrete method, with thickness of 42” to provide adequate strength to retain soil during mass excavation. It used over 200 tons of both steel and GFRP (Glass Fiber Reinforced Plastic) bars, and 6000 cubic yards of concrete.
The slurry wall was constructed with various “soft eyes” where the tunnel boring machine will bore through to begin tunnel excavation. GFRP bars were used in place of traditional black steel at pre-determined locations to accommodate slurry wall opening requirements for the tunnel boring machine.
Due to the depth required for this project, maintaining verticality of excavation is the most important aspect for a quality product, as such multiple technologies were used to monitor the deviations of the panel.