Keller companies Case Foundation and HJ Foundation have joined forces to deliver a design-build project for Washington DC United’s new soccer stadium.
When open, the Audi Field stadium in southwest Washington DC, will have a 20,000-seat capacity, with the ability to host concerts and major cultural events in addition to soccer games.
Case was awarded the project by general contractor Turner Construction in February 2017. They brought in augercast pile experts HJ Foundation, creating a Keller joint venture.
By the end of February, the team had installed test piles, with full production starting a month later.
Over the next four months, they constructed 47 augercast piles with 122cm diameters to a maximum of 30.4m deep; 160 with 94cm diameters to a max of 22.8m; and 95 with 46cm diameter to a max of 21.3m
HJ Project Manager Nicholas Feldt said: “Ground conditions were relatively easy, with soft soils in the upper portion and the piles embedded in the Potomac foundation, which is a dense silt and clay. There was really nothing too challenging in terms of the drilling.
“In some areas there were contaminated soils that had to be remediated before we could move in, so we stayed on top of that, chasing it and making sure it was on schedule so it didn’t hold us up.”
The firms believe they might have beaten a world record on the project. During test-pile installation, a 1220mm augercast pile was installed to a record depth of 30.48m in a single stroke.
“As leaders in deep foundations, we take great pride in pushing the industry and in our achievements” adds Feldt.