Slightly different office to most

Posted by: @john-hamilton

I did some gyro azimuths for a pair of hydro tunnels in Peru, they had me come in when they were getting close to breakthrough, drilling from both ends. I think one was 22 km and the other a bit less. Had a bit of a water problem...

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We had to ride in the mine cars to get to the face, about 45 minutes each way

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Here was their "low-tech" TBM guide target, as long as the laser was inside the hole, they were online

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I had to observe a surface line to calibrate, on triangulation pillars

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The TBM was nowhere as clean looking. They actually got one of them stuck, and had to bring in another one to clear a path to get it out.?ÿ

They sent me pics when they broke through, not sure what I did with those.?ÿ

?ÿ

Awesome. Never worked with a gyro myself, that's true surveying. I love it!

@beuckie?ÿ

We won't use a gyro on this one in the pictures the first two drives are only 1.6km per drive, the alignment is almost a straight line too. Did some astro-shots on the external control, just for self development/curiosity exercise as I heard its more accurate and we never covered that when I went to university (still got to process it).

The second two drives?ÿare?ÿabout 6km per drive, curved alignment. We'll use a gyro, start, midway and one?ÿjust?ÿenough?ÿbefore breakthrough?ÿprobably.?ÿ

Start reference was about 500 metres on the first drives, got the benefit to start it from a very open cutting in the countryside.?ÿ

?ÿ

@john-hamilton

The water does look a bit of a problem and?ÿI'm very impressed with those guide targets!?ÿ

Looks like a great experience to have had like an expedition. Would love to work abroad in South America at some point, been to Peru and Ecuador before and loved it.

UPDATE: One completed

Is it a boring job?

@dave-karoly?ÿ

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@dave-karoly?ÿ

???? Indeed