Laser Scan a 500m vertical access shaft

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Laser Scan a 500m vertical access shaft

Postby christopherbyrne18 » Mon Aug 15, 2016 5:24 am

Hey Guys,

I have a project that's come up that involves laser scanning a 500m vertical access shaft for an underground mine. Its been widened to take more people and ore to & from underground. It needs to be scanned pre & post widening and has an accuracy requirement of about 15mm due to the lining they plan to use. I've been asked to come up with a methodology. I can come up with a plan for the pre widening survey as the existing access basket will be in place and we can scan from that at intervals making sure its stabilised. The problem I have is the post widening survey as there will be nothing in the shaft, no basket, cables etc. I've been trying to think of ways we could lower a scanner but can't seem to find a suitable system or method. I was thinking maybe a system like a Geoslam Revo lowered and raised on a cable with control points at the top and bottom (won't have access to put targets in along the shaft). I'm not sure how accurate this would be and how much drift there would be in this type of system over 500m. Anyone out there completed a job like this? Any recommendations?

Cheers,

Chris
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Re: Laser Scan a 500m vertical access shaft

Postby stuartcadge » Wed Aug 17, 2016 12:52 pm

Hi Chris,

Sounds like an interesting project you have there. This sounds like something the REVO could potentially help out with. Coincidentally we are carrying out some similar trials over the next couple of weeks, so we will know more on the feasibility of this soon...

If you'd like to send me a quick email we can start up a dialogue and I can let you know how the trials go?

stuart.cadge@geoslam.com

Cheers
Stuart Cadge
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GeoSLAM Ltd
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Re: Laser Scan a 500m vertical access shaft

Postby Diamond Digger » Wed Nov 02, 2016 4:21 pm

christopherbyrne18 wrote:Hey Guys,

I have a project that's come up that involves laser scanning a 500m vertical access shaft for an underground mine. Its been widened to take more people and ore to & from underground. It needs to be scanned pre & post widening and has an accuracy requirement of about 15mm due to the lining they plan to use. I've been asked to come up with a methodology. I can come up with a plan for the pre widening survey as the existing access basket will be in place and we can scan from that at intervals making sure its stabilised. The problem I have is the post widening survey as there will be nothing in the shaft, no basket, cables etc. I've been trying to think of ways we could lower a scanner but can't seem to find a suitable system or method. I was thinking maybe a system like a Geoslam Revo lowered and raised on a cable with control points at the top and bottom (won't have access to put targets in along the shaft). I'm not sure how accurate this would be and how much drift there would be in this type of system over 500m. Anyone out there completed a job like this? Any recommendations?

Cheers,

Chris


Hi Chris
Haven't logged in for a long time so missed your query. Are you still looking for an advice?
We scanned few shafts even deeper than yours with no hoisting facilities inside. If the job still pending you can write to my personal email: sergey.reznichenko@sigh-power.com
Kind regards
Sergey
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Re: Laser Scan a 500m vertical access shaft

Postby sreed » Wed Nov 02, 2016 6:42 pm

Hi Sergey,

I tried to send you an email to the address you provided and I got an "undeliverable error". Can you shoot me a note to sreed@prologuesystems.com when you get a moment?

Thanks,
-S.
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Re: Laser Scan a 500m vertical access shaft

Postby walkerrichard » Tue Dec 13, 2016 1:37 am

Buy or lease a GeoSLAM unit, from a GeoSLAM provider.
Or if budget is a constraint I have a couple of old Zeb1's which will get much, much better than spec and they have an articulating fixture for steady scans.
These are available as posted in the kit for sale section - we can sell and ship used gear anywhere.

Cheers,
RW
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Re: Laser Scan a 500m vertical access shaft

Postby Phil Marsh » Tue Dec 13, 2016 2:02 pm

christopherbyrne18 wrote:.... and has an accuracy requirement of about 15mm due to the lining they plan to use.

When it comes to accuracy there are important details to remember. Local accuracy and network accuracy which are not the same.

•Local accuracy (or relative accuracy) represents the uncertainty in the positions relative to the other adjacent points to which they are directly connected.

•Network accuracy (or absolute accuracy) requires that a position’s accuracy be specified with respect to an appropriate truth set such as a national geodetic datum.

This will drive the equipment to be used and the methodology you'll need to complete the project.
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