Construction of the NuMI Off-Axis Electron Neutrino Appearance (NOvA) laboratory in northern Minnesota presented numerous challenges. Sensitive equipment had to be shielded from the sun's cosmic rays. Space for the underground laboratory was blasted into solid granite, and the roof comprised precast- and cast-in-place concrete topped with 6 in. (150 mm) of dense barite aggregate. Close collaboration among the contractor, precast concrete fabricator, and design engineer resulted in an innovative beam section that permitted two beams to be transported to the remote location on each truck. Precise quality control was necessary to accommodate the final cumulative beam deflection.
|Original language||English (US)|
|Number of pages||7|
|State||Published - Dec 1 2013|
- Inverted tee
- Quality control