Buildings are heavy. Buildings need support. Which explains the presence of the big blue Stalworth machine at 111 South Peoria Street in the West Loop, site of the now-underway Illume Chicago. That’s the beast responsible for drilling caissons into the earth for the future 10-story, 79-condominium project from LG Development and Pappageorge Haymes Partners to rest upon. And rest it will — everyone will — once things quiet down a little bit. Caisson work is loud.