September 20, 2020
AIL is proud to have another Super•Cor and MSE Panel Wall project now nearing completion of Phase 1 in Nova Scotia. In this case, we were able to support the contractor, Dexter Construction, early on in their design‐build proposal with an innovative and economical packaged solution to carry forward to the Nova Scotia Department of Transportation and Infrastructure Renewal (NSTIR).
Railway overpass featured two‐stage construction, skewed design, innovative footings
This highway twinning rail tunnel project required a two‐stage construction sequence, with the structure for the new west‐bound lanes being built first with a temporary MSE Wire Wall on the median side. Once this crossing was complete and opened to two‐way traffic, the old three-span concrete bridge could be demolished in preparation for the new and re‐aligned east‐bound roadway to be constructed adjacent to the west‐bound.
The skewed alignment of Highway 101 to the railway tunnel was 50 degrees, which posed a particular challenge in developing the temporary MSE wall configuration that would support the new west‐bound lanes, but not undermine the existing live east‐bound lanes of Highway 101.
AIL engaged the services of Harbourside Geotechnical Consultants to analyze the cut slopes and propose a construction sequence that would mitigate the risks of slope failure and approve the underlying foundation capacity to support the applied loads of the MSE walls and the Super•Cor Arch footings.
As with any AIL buried bridge solution, bonus points were recognized for the lower installed cost, faster installation and a continuous running surface with none of those troublesome bridge deck expansion joints to maintain. Add to that the 75+ year design service life of Best•Kote and you have a sustainable solution that is hard to beat.
Our project partners are pleased with the engineering and supply services AIL has provided for Stage 1 and Stage 2 is already underway.
Over the past few years, NSTIR has seen the benefits of including AIL’s packaged solutions of buried metal arches and MSE walls in their tender callings on Highway 103 and 107, and with recent projects being completed at Kieley Brook/Ingramport and East River Bridge, near Chester.