Wednesday, May 1, 2013

The Big Screw

Soil screw conveyor by WSDOT
Soil screw conveyor, a photo by WSDOT on Flickr.

Here is the soil screw conveyor to move the spoils from the tunneling machine as it bores through downtown Seattle.

The cutter-head is off to the right in the background.

3 comments:

  1. Replies
    1. If you do a size reference to the warning cone (about 4' high) in front (middle) tied with the yellow tape, I would guess 48", I.D.

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  2. Look at the bottom of this photo, behind the ladder at he bottom. http://www.flickr.com/photos/wsdot/8135260841/in/set-72157631880763139/lightbox/

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