Anchorage Sand and Gravel Concrete Storage Facility

In 2015 Roger Hickel Contracting (RHC) was awarded a new concrete storage facility for Alaska Basic Industries. The work started in the summer of 2015 and concluded in the fall of 2016. The project consisted of site work, circular perimeter footings, a tunnel 10 feet tall and 10 feet wide, a compressor building, a stair tower, and a neoprene hemisphere that was used to shape the dome. The end product was a 162-foot diameter, 86 foot high concrete storage dome that can store 40,000 tons of Portland cement. Roger Hickel Contracting worked with Fergusson and Associates and ABI to help coordinate Phoenix Mechanical Group and DOMTEC to build the dome itself. Workers from Idaho Falls were flown up to erect the giant neoprene hemisphere on site. The membrane was laid flat with an airlock and in 24 hours the dome was inflated. The crew then sprayed insulating foam on the inside of the neoprene wall, reinforced it with a million pounds of rebar, and applied between 16 and 24 inches of shotcrete, or sprayed in concrete, on the walls. The base of the dome is much thicker than near the top of the dome for added structural integrity. The shotcrete adds stability, particularly in the case of an earthquake. During an earthquake, it could cause the contents inside the dome to shift back and forth so that stability is of the utmost importance. The neoprene fabric layer is resistant to sun damage and designed to withstand over 25 years of use. The large bridge and entrance building that sits on top of the dome was fully constructed on the ground after the dome was erected. Roger Hickel Contracting shored it up, leveled it, put the siding and roof on, and then flew the unit up in one piece using a large capacity crane. This method saved the owner money while keeping with the project schedule.