Tunnel boring machine hits sewage line - GIFs

Tunnel boring machine hits sewage line in Sao Paulo, Brazil.

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Previously:

https://www.homemadetools.net/forum/...165#post161143
https://www.homemadetools.net/forum/...165#post153733
https://www.homemadetools.net/forum/...459#post139099
https://www.homemadetools.net/forum/...905#post152724
https://www.homemadetools.net/forum/...841#post100173

The guy runs to safety and misses the shot - obviously not a young kid.

Classic, "That just turned to **** moment."

https://brazilian.report/liveblog/20...n%20a%20crater.

https://tunnellingjournal.com/sao-pa...or-expressway/

"We were only off by 2 degrees (3 miles back)"

Quote:

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Originally Posted by Hoosiersmoker

"We were only off by 2 degrees (3 miles back)"

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The terrible thing is that even less is most likely the cause. In downtown Ottawa they were boring a tunnel for light rail and they hit a water main. The news called it a cave in / sinkhole. I had friends that were involved in the fix. Every available cement truck was dumping into this hole for over a day. Guaranteed that the lump of cement cracked and overheated. To big to pour without cooling. But all they wanted was something solid to core a hole through.

Quote:

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Originally Posted by Hoosiersmoker

"We were only off by 2 degrees (3 miles back)"

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In support of the engineers, 2 degrees off 3 miles back would be a deviation of 553 feet.

Just 2 seconds off 3 miles back (60 seconds to a minute and 60 minutes to a degree) would be about 2 inches off (1.841 inches.)

Pretty amazing what they are able to do.