November 2015

ULI Jack Kemp Finalist - BASE Capitol Hill 3

Congratulations to Scott Shapiro, S+H Works Architecture, and Lund Opsahl for recognition of BASE Capitol Hill micro apartment complex. For more information about the finalist award, see this “Micro Apartment Finalist for ULI Award” link in the Daily Journal of Commerce.

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The crew at Sellen Construction was faced with the challenge of shoring two sides of the 8 story basement excavation at the Centre 425 project in Bellevue without soil nails or tie backs. To achieve this, they constructed half of the floor plan for the basement parking levels starting at the top and working their way down, using the floor slabs to brace the shoring wall. Lund Opsahl was hired to design a steel framed laydown floor to support the formwork tables suspended from threaded rods below. This innovation allowed ongoing excavation while the post-tensioned concrete slabs were being constructed. Once cast, the formwork was cycled down and work began on the next floor. Conventional reshoring of the remaining floor plan, a pile supported tower crane, and elevated construction walkway cantilevered from the shoring wall were also provided as part of our construction support engineering services for this project.