St. Louis, MO
Concrete Strategies performed the structural concrete and flatwork for this bio-medical research building. The university medical center project consisted of a deep foundation system for an approximately 85,000-square-foot steel framed building. The 120 drilled piers ranged in size from three to 6-feet in diameter, with shafts that extended into rock as much as 25-feet. The perimeter concrete walls were 18-inch thick and most were 31-feet tall. The walls were tied into the interior foundations by grade beams that were up to 6-feet wide and 8-feet deep. Concrete columns, 4-feet by 4-feet, were installed up to 28-feet tall to support structural steel that had to span the existing MetroLink tracks. Access was provided to the basement of the building by a 90-foot long by 18-foot tall concrete tunnel. A clamp-type gang form system was utilized for the perimeter walls. Internal and external vibration equipment was used to ensure proper concrete consolidation due to heavy reinforcement of the walls. Due to this, patching of honeycombs was limited to approximately 1000-square-feet (on over 50,000-square-feet of wall poured).