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Unfortunately I was at work while they poured the grade beams, so I didn’t see the process, but the point is they bring a bunch of wet concrete to the site via some sort of mixing truck, and they pour the beams.   Concrete bricks were used as  “chairs” to hold the steel up off the bottom of the trenches so that the steel in totally encapsulated in concrete.  It takes about 3 weeks to fully cure, but the concrete is substantially cured within a couple of hours.  Threaded rods, hooked at the bottom, were placed in the beams vertically where all the piers and stem walls will be located. These are the rods that are sticking up in the photos.

In this case, they are extra tall so that they will also thread through the wood sills which support the floor framing.  More typically, the threaded rods are cutoff somewhere within the middle of the piers (not yet shown), and a j-bolt anchor is then installed in the pier which is secured to the sills.  Although the continuous threaded rod is a stronger detail, I realized a bit too late that it is a little tricker to install properly.  As you can see the rods are slightly angled and leaning in some locations.  However, they need to be precisely aligned so that when the sills are installed the rods are roughly in the center.  This is a bit hard to explain, but is the future I believe I will switch to using a separate anchor bolt to secure the sills.

In the last image you see 4 threaded rods arranged in a square pattern.  These will be cast into cylindrical piers that will support the Studio structure.