U.S. Bank Stadium earth retention and other underground construction

摘要

The earth retention systems for the U.S Bank Stadium, home of the Minnesota Vikings, were built during the winter of 2013-2014, the coldest in the Twin Cities in 35 years with an average temperature below 10°F. Schnabel Foundation Company designed and constructed permanent tieback soldier beam and wood lagging support systems up to 40 feet high to resist permanent lateral loads along the stadium below grade walls. Additionally, Schnabel installed temporary tieback soldier beam and wood lagging walls, rock anchor tiedowns for the stadium foundations, tiebacks for other temporary excavation support systems and drilled piers for a tower crane foundation between December 2013 and May 2014. The project's ground conditions created difficult challenges that required specialized equipment and tooling. The design and construction of the earth retention systems along with other site challenges and teamwork required to complete the work within the project's aggressive schedule are presented herein.