DGS Construction LLC was contracted to complete the concrete work for the project. The apartments and parking garage were completed using post-tension and rebar reinforcement. This included concrete structural slabs, beams, columns, shear walls, parking slabs, balconies and site concrete work. DGS completed in-house 3D modeling for the concrete and reinforcing steel on this project. A fully coordinated BIM concrete model was created and rebar detailing, shop drawings, and fabrication barlists were generated directly from the 3D model. The 3D model was also helpful in identifying conflicts and finding coordinated solutions prior to construction in the field. This saved costs by proactively resolving clashes. We also used integral colored concrete in various areas on the first level and the 8th level.
The first seven floors were 35,000 square feet each and were a mix of retail space, condos and parking garage. Each of the first 7 floors had multiple elevations as the parking garage cut through the building. This added complexities to the construction sequence. Level eight was a mix of condos with 14,500 square feet of outside living space. Level eight also included a 35,000 square foot transfer slab, with an average thickness of 12″, and two 40′ transfer girders to support the 17 story tower above. The 17-story tower had 20,000 square foot on each floor. The roof featured a 2,000 square foot pool supported by two 60-foot long post-tensioned beams.
The 8th and 24th floors have outdoor terraces with green space. DGS placed and finished various areas of architectural concrete including planters, sidewalks, and curbs to create outdoor appeal. In addition, on the ground floor they completed various items of landscape work, including form liner walls with integral color and integrally colored flatwork.
Each of the building corners on President Street were designed with a feature column on each corner. These columns were oval shaped and got wider from the ground to level three, which was also on the exterior of the building. They then gradually got smaller from levels 3 to five, continuing on the interior of the building. After level 5, they continued up the corners as traditional round columns. Working with Doka, who supplied the formwork for the project, they designed and produced a custom mold for these columns. These molds were made from Styrofoam, with the mold in the center and the exterior of the mold square so that the Doka formwork could be positioned around it to hold it secure it during concrete placement.
The concrete was supplied by Schuster Concrete Ready Mix LLC’s Baltimore City plant located only three miles from the jobsite. Delivering concrete in a very busy area of the city can cause issues during pours. However, Schuster’s close proximity and their experience delivering concrete in congested areas of the city allowed pours to progress smoothly.
Project Details
CLIENT
Avalon Bay Communities, Inc
PROJECT TYPE
REGION
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