Project: Centre 10
Cost: $100 million
Location: Calgary, Alta.
Project delivery method: Construction management
Companies involved: NORR Architects Planners, Centron Group of Companies, TRL & Associates Ltd., Hemisphere Engineering, SMP Consulting Electrical Engineers, J.R. Spronken & Associates Ltd.
New life to abandoned site
Marketed as an “iconic beltline property,” Centre 10 is this year’s Alberta Construction Magazine Top Projects winner in the Commercial—Over $50 Million category.
Located in downtown Calgary, Centre 10 is built on the site of the former Gaslight Square retail strip. Two attempts had been made by others to build condo towers there, but when the Centron Group of Companies bought the abandoned site, the concept changed to a single-building, mixed-use office retail development.
The site contained a completed seven-level underground parkade structure, as well as the second-floor slab. Once the land-use change was obtained, Centron designed a 10-storey commercial office building consisting of 365,000 square feet of office space.
There were many design implications for an existing structure to accommodate the new office layout. Several areas of the parkade did not have the structural capacity to accept the new office loads, so the existing foundations had to have the capacity increased by the use of micropiles.
As well, the existing structure had to be modified to accept a new central core elevator. This involved a massive raft slab at the P7 parkade level, which required excavation and concrete forming in limited space, and shear walls through the parkade to transfer the loads from the main floor.
To accommodate proposed retail on the main floor, columns had to be removed to increase the floor space. This increased the load on existing columns in the parkade. The techniques that were used to remove existing columns and replace them, while maintaining the schedule of the vertical concrete elements, were innovative as well. Specialty collars were designed to transfer the column loads while removing the existing columns. These processes had not been used in this market before.