![]() deep, and the distance between the core form framing and the core wall form itself was 30 in.,” says Carl Hultman, senior project manager at steel erector Danny’s Construction.Īlmost all deliveries to Salesforce Tower’s site had to go through a tunnel underneath Wolf Point East directly north of the site.Īccounting for the depth of the lift, there was only 4 in. Placing those tie plates was difficult inside the core form framing because of the tighter geometry of the slimmed-down tower, especially at level 40. The belt truss, outriggers and associated tie plates alone totaled 675 tons, says Colin Gilbert, project manager for steel fabricator Cives. Steel erector Danny’s Construction had to place the outrigger in tight spaces due to the geometry of the building and the two neighboring towers. “Instead of having a 42-ft-wide core, we effectively have a 120-ft-wide core within these floors,” says Streid. ![]() The building is stiffened at levels 38-40 by a system of outriggers that span from the reinforced concrete core to the perimeter columns and a belt truss. With limited lay-down area, crews had to coordinate crane picks for materials upon arrival. Army Corps of Engineers to overhang the river as much as possible to minimize eating into the site, which was already limited by a road underneath Wolf Point East. Streid says that MKA, design architect Pelli Clarke & Partners, Hines and contractor Walsh Group negotiated with the U.S. A city-required riverwalk cantilevers 16 ft over the water. The first floor is at the same raised elevation of much of downtown, above lower Wacker Drive. The tower has four reinforced concrete basement levels but only one is below grade-roughly 10 ft below river bottom. The overall development, which has two existing residential towers, Wolf Point East and Wolf Point West, sits on a former Kennedy family-owned parking lot. Wolf Point South, the speculative building's original name before Salesforce became the main tenant, referred to the confluence of the three branches of the Chicago River. The foundations consist of 110-ft-long caissons socketed 6 ft into rock and belled caissons under perimeter columns and the core. The superstructure consists of steel frame around a reinforced-concrete core, connected by composite concrete and metal decking. Photo by Jeff Yoders/ENR A River Runs By It “There has been a paradigm shift in the past 10 to 15 years where people need less space and companies are looking to fit more people and get rid of some of the wasted square footage,” says Sean May, senior project architect for architect-of-record HKS.Ī Walsh team installs curtain wall at SalesForce Tower in Chicago overlooking the confluence of the Chicago River's three branches. square, Salesforce offices are half the size of a traditional office. One way to minimize the carbon footprint is to reduce the office size. The general contractor supports the use of higher-strength steel because it results in a smaller section size and lower EC, says Elliot Wilm, Walsh's project manager. Walsh expects to complete the $800-million tower next year. ![]() ![]() Streid said earlier projects forced MKA to recommend 50-ksi steel because of a lack of competitive bids. ![]() On Salesforce, the strategy reduced the column sizes by 30% compared to 50-ksi steel and saved one to three hours of preheat time to help achieve a 9% reduction in steel on the project.īoth Nucor, which supplied Salesforce, and ArcelorMittal produce a 65-ksi product, which helped with competitive bidding. Streid says 65-ksi steel is the firm's new baseline. ![]()
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