Innovative planning and execution were necessary when underpinning rights could not be obtained for the west wall of this ambitious project. The goal was to avoid using heavy retention systems that would reduce the structural footprint. To prevent this type of encroachment, conventional steel piles were placed in an innovative way, 12 inches back from the final finished face of the wall. Waterproofing and reinforcing followed after excavation was done in 5 – 7 ft lifts. Torrent then built construction bulkheads for the ends and the bottom of shoots to ensure no contamination and a good structural bond. Steel plates were then welded to the piles to support the rebar prior to shooting. This steel plate and pile combination performed double duty, also serving to fully support the structural shotcrete. Structural shotcrete was then applied top-down from ground level to the final 9th level of the parkade creating the final finished walls.
The Sturgeon Refinery, a massive diesel processing plant northeast of Edmonton, is the single biggest project that Torrent has been a part of to date. Torrent was called upon to help install sump retaining ponds within an extremely challenging existing environment. Because intricate underground mechanical infrastructure was already in place, conventional excavation techniques were not possible. Torrent worked with Double-Star Drilling to devise a build plan that involved excavating straight down in a step-by-step manner, shoring as we went, all the way to the bottom. From there, Torrent installed single-sided forms in space-limited confines and shot the walls back up to the top. This innovative execution eliminated all the issues that would have been encountered with conventional gradual slope excavation and two-sided form wall construction and ensured that none of the intricate existing mechanical infrastructure was impacted.