[...] the Erection Co. topped out Seattle’s 850-ft-tall Rainier Square Tower, with its radical composite steel frame dubbed “speed core,” in only 10 months. Steel erection began last October in the lowest basement.
The retail-office-residential building is on course for substantial completion next Aug. 13, according to Andy Bench, project manager for the developer, Wright Runstad & Co.
— Engineering News-Record
The NBBJ-designed Rainier Square Tower recently became Seattle's new second-tallest skyscraper after construction height passed 772 feet. Now its developer, Wright Runstad & Company, also celebrated the structure's official topping out at a height of 850 feet.
Today we celebrated the Rainier Square Topping Out in Seattle! Everybody involved with the project signed the final beam and after a couple speeches, it was raised up and fitted into its spot. A great milestone for Rainier Square! pic.twitter.com/YC4mkEK7ZP
— Wright Runstad & Co. (@WrightRunstad) August 15, 2019
"The core, surrounded by a conventional steel frame, consists of a modular sandwich system of cross-tied steel-plate walls, field-filled with concrete," explains Engineering News-Record the unusually fast construction method. "The modules were fabricated by the Supreme Group. The system requires no rebar and no formwork."
Final completion of the 1.7-million-square-foot mixed-use tower is scheduled for mid-August 2020.
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