Fortunately nobody was seriously injured as a drilled shaft rig toppled over at a construction site in Maroochydore, Queensland, Australia. No word on what caused the accident at the building site. The operator was inside the cab at the time and suffered minor bruises. The article mentioned that the mast of the rig landed in between two other pieces of equipment and fell on an area that was occupied by a group of workers just moments earlier. (Photo by Michaela O’Neill, thedaily.com.au)
On May 15 a drilled shaft rig operated by Mid America Drilling Corp was nearly swallowed by the 9-ft diameter hole it was drilling for a cell tower foundation near Harlan, Iowa. Fortunately nobody was injured and the truck did not suffer any significant damage.
In Arizona, the standard of practice is to use a temporary surface casing to prevent dangerous failures like that. I once saw pictures of a drilling contractor superindendent almost get sucked into a collapsing shaft, even with the temporary casing. Pretty scary stuff. Source: Harlan Tribune. (Photo by Samantha Bruck)