If you check out the video regarding the 1 Bloor construction progress, it does show beams being piled at that specific location shown in the photos - http://youtu.be/tjSRnv9zFk0
There's been a whole lot of re-bar laid down on the south-east corner of the site, whether it's for storage or they're starting to lay it I don't know, I just know what I've seen.
What they are drilling are caissons for the raft slab. They need to drill form that platform
because the lower level will not support the heavy rig! Same as the u condos, seems slow but it is alot of work.