And a train was actually hit! Fortunately it was stationary on the tracks, but it crushed the side panel of the driver’s carriage. Neither the driver nor any passengers were injured in the incident. The drill rig was drilling to install ground source heating or geothermal heating for a hotel when at a depth of 20 to 25 meters (65 to 82-ft), the drillers noticed that they lost resistance when they punched through the subway tunnel. Upon withdrawing the drill stem, they were missing the bottom 2.5-m according to a local police official. Story at The Local. (Photo of N.Y. Subway from runnx)
Hitachi Zosen Corporation has been selected by Seattle Tunnel Partners, WSDOT’s joint venture constructing the SR 99 bored tunnel. Hitachi Zosen was the best value manufacturer based on overall technical requirements, support capabilities, price and […]
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)