Project: Detector plant cast in concrete into the rock below grade - 106 m long, 21 m wide and 21 m high
Contractor: Adolfson & Peterson Construction
Formwork Engineering: MEVA Formwork Systems, Springfield, Ohio
130 research scientists from more than 30 institutions will conduct first-time ever experiments to investigate the origin of matter by sending a beam of particles called neutrinos 810 km underground from their laboratory in Illinois to the woods of Minnesota, close to the Canadian border. The beam, travelling at close to the speed of light, will end in the so called NOvA Far Detector plant in which the properties of the particles will be examined in a huge tank of scintillator oil. The project entitled NOvA (short for NuMI Off-Axis ve Appearance) is being funded by the U.S. Department of Energy. The scientists hope to shed light on the question of antimatter, which some believe to be tied to the properties of neutrinos.
Detector plant cast in concrete into the rock below grade
For scientific reasons, the NOvA Far Detector plant is secluded and its enclosure embedded 12 m in rock below grade. The 3,800 m² detector enclosure is 106 m long, 21 m wide and 21 m high. It will have cast-in-place concrete floor slab and walls. Its roof will be a composite construction of precast concrete planks with a cast-in-place concrete topping. Cosmic ray shielding will be provided by a 15 cm deep barite aggregate layer. The enclosure includes support facilities such as computer, control and electrical equipment rooms. The adjacent service building, built at grade, includes a loading dock, office, scintillator and mechanical equipment rooms. Adjacent to the loading dock is a tanker unloading facility sized to accommodate four trailers as well as safety and spill containment.
Pouring concrete against rock:
single-sided formwork solution from MEVA wins on technical counts
After the mud and base slab was poured, single-sided formwork was assembled to pour against the rock:
The 12 m high single-sided walls were poured in two cycles with formwork lifts of approx. 7 m and 5 m. At height, the wall formwork rested on KLK support platforms that climbed the walls in 2.5 m lifts. The rebars were anchored to the rock on the outside of the walls using rock-anchors that were cast before rebar work.
The entire formwork equipment was delivered and serviced from MEVA Formwork Systems Inc. logistics centre in Springfield, Ohio, USA.
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