That’s welcome news but this whole saga could be typified as a tragedy in terms of design and what’s getting built. It’s been a tedious path.
New Renderings
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I understand the disappointment when comparing these with prior proposals, but these are absolute quality buildings.
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„ To form the foundation of the 72-story tower, a caravan of over 250 concrete trucks delivering every 2 minutes over a 12-hour period delivered 9 million pounds of concrete. Over 2,300 cubic yards, or 470,000 gallons, of concrete was placed on-site. The volume is equivalent to filling an Olympic size swimming pool or a 9-mile-long sidewalk. Approximately 622,000 pounds of reinforcing steel, equivalent to about 155 automobiles, was placed on-site over the past two weeks in preparation for the foundation pour. The massive effort was managed by 30 workers on-site, plus 25 concrete truck drivers.“
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The circle that’s visible, is that the original foundation for the core of the Chicago Spire?
Yes/No, the foundation for the Spire was technically never built out, the hole was only excavated for it, the circle is new construction but it is a circle because it was formed inside the circular retaining wall before everything was excavated around it and later removed.
Its not the actual representative footprint nor foundation.
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Under construction?
So the remainder of the old circle was filled back in after the new foundation was built?
Not sure if I understand the question properly,
The original hole that sat there for years was drained and excavated slightly more to undercover the caissons that had already been put in place for the Chicago Spire (I need to clarify to @TK2000 that the caissons are the only “part” of the foundation that was ever completed, but the main foundation, which is what sits ontop of the caissons/piles’ was never built).
A raft foundation for the new tower was poured ontop of the newly revealed old caissions within the circle of the coffer dam hole. And some interior support columns and the core was built up, the interstitial space between the coffer dam and the core was filled several feet/a level with earth and another circular slab was poured within the confines of the coffer dam.
While this was happening the rest of the site was being excavated for the below grade/parking levels and the coffer damn was slowly removed until it reached the level of the aforementioned slab which is what we see in the circular pour in recent images. What looks like dirt colored substance within the area of the circle is not dirt.
Happy to provide more clarity.
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Why was the steel reinforcement treated with a green protective coating?
Photos via Building Up Chicago
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The green stuff is a protective epoxy. It protects the rebar against corrosion.
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