Precast concrete beams meet logistics, deflection challenges in remote underground lab

Sarah Fister Gale, Marvin L Marshak

Research output: Contribution to journalArticle

Abstract

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 languageEnglish (US)
Pages (from-to)38-44
Number of pages7
JournalPCI Journal
Volume58
Issue number1
StatePublished - Dec 1 2013

Keywords

  • Camber
  • Deflection
  • Inverted tee
  • Quality control
  • Roof
  • Transport
  • Underground

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