Sci/Tech Changing The Teeth On The World’s Largest Tunnel-Boring Machine

Furby

Current occupation: News poster


Next year, workers will start digging a 1.7-mile tunnel underneath downtown Seattle using the world’s largest tunnel-boring machine. The 57.5-foot-diameter, $80-million drill, which is currently under construction for the State Route 99 project, has about 600 cutting tools—steel bits and spinning disks on the borer’s face that break up dirt and rock. The tools may need to be inspected as often as every 400 feet, or about 20 times over the course of construction.

Engineers on the Seattle project have modified the design of the drill, manufactured by Hitachi Zosen, so that workers can replace the teeth from inside the safety of the machine itself. The new borer is large enough that people can work just behind the drill face at aboveground atmospheric pressure. The better equipment, combined with the safety and freedom from working at sea-level pressure, could make repairs about four times as fast.

Read more at PopSci.com.
 
General chit-chat
Help Users
  • No one is chatting at the moment.
  • Ghan Ghan:
    Chat should show on the sidebar when not logged in now.
  • Ghan Ghan:
    (You'll still need to log in to post messages)
  • Ghan Ghan:
    Test!
  • tom_mai78101 tom_mai78101:
    I must be in a test server.
  • tom_mai78101 tom_mai78101:
    Nice, Twitter tweets embedding now works
  • Wizard Wizard:
    Yup.
  • Ghan Ghan:
    Excellent.
  • Ghan Ghan:
    @tom_mai78101 Hello there.
  • Ghan Ghan:
    Tagging works in the chat too.
  • tom_mai78101 tom_mai78101:
    @Ghan Missed it.
  • Wizard Wizard:
    Still fixing things here and there. Added widgets to the portal, will make it match the ones here on the forum index tomorrow.
  • Ghan Ghan:
    The venerable World Editor Tutorials site has been converted to HTTPS at last.
  • jonas jonas:
    cool
  • jonas jonas:
    and I can even edit my messages, nice
  • seph ir oth seph ir oth:
    GENERAL CHIT CHAT, YOU ARE A BOLD ONE
  • Ghan Ghan:
    Hello there
  • The Helper The Helper:
    this new chatbox is great and the forum software update is great too
    +1
  • The Helper The Helper:
    upgrade has fixed forum registration spam problem
  • tom_mai78101 tom_mai78101:
    Something tells me we might be able to customize the chatbox a bit, considering that there's a gap under every message.
  • Wizard Wizard:
    Going to deploy a fix soon, just had to take some time for myself this weekend.
  • Varine Varine:
    Unbelievable. Time for yourself? How dare you!
  • Wizard Wizard:
    xD
  • tom_mai78101 tom_mai78101:
    Hm, it is now harder to type anything on an Android phone. Pressing Backspace or Enter keys will dismiss the Android keyboard for some reasons.

    Members online

    No members online now.

    Affiliates

    Hive Workshop
    Top