The 167 Green St. project, known as Spectre, brings much-needed office and urban space to the epicenter of Chicago’s former meat-packing district, Fulton Market. With the largest office floor plates available in the rapidly developing neighborhood, the 17-story tower offers 360-degree views with floor-to-ceiling glass on all sides, 13-foot-plus ceiling heights and private tenant terraces on two of its levels.
Tribco provided a complex cast-in-place concrete core and all cast-in-place concrete (with structural steel embeds/anchor bolts and reinforcing steel) for the structural steel office building. The scope of work included foundations with an anchoring system for the tower, which consisted of 750,000 square feet of slab on metal deck for the office levels. Tribco also installed topping slabs, parapet walls, curbs and pads, concrete-encased structural steel columns and a unique architectural feature wall on the first level. A self-climbing wall formwork system from Doka Formwork was used for this project.
The concrete core is large, with three individual cells and an overall dimension of 83 by 33 feet. The high floor-to-floor heights necessitated 13-foot pour lifts. The foundations and several levels of the concrete core were required to be in place, structurally ready, ahead of the structural steel erection. As the structural steel and metal decking progressed and the concrete core advanced, the Tribco team dropped below to previous levels and poured the slabs on metal deck. The two processes climbed in unison until topping out.
Accurate placement of the structural steel embedded connections was critical to the project’s success. There were approximately 2,300 embeds within the core wall with demanding location tolerances, and Tribco worked closely with structural steel supplier/erector Two-in-One Contractors, based in Chicago, to employ timely solutions for the few embeds needing remedial work.
The official groundbreaking took place April 19, 2019, and Tribco’s work was completed June 2020. Spectre rises above a new public walkway (known as the “mews”) that gives pedestrians access to the building’s ground-level restaurants, retail and green spaces.