Steve Dixon
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Zambia, Clarke 1880, ARC 1990 Help

Started this discussion. Last reply by ciro Sugameli Apr 24. 2 Replies

Can anyone share the transformation files for ARC 1950 for Leica Geo Office? I am trying to process data near South 17d latitude and East 31 Longitude. if you had a geoid file for the area that would…Read more →

Tunnel boring alignment

Started this discussion. Last reply by Jacques Detmar Dec 21, 2017. 15 Replies

Any suggestions on how to set an alignment for a TBM 25 metres down a shaft? I need two points at the bottom for the alignment but can not see down into the hole. The dimensions of the hole are 3…Read more →

Tags: boring, tunnel

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Ricky Mwanza favorited Steve Dixon's discussion Zambia, Clarke 1880, ARC 1990 Help
May 9
⚡Survenator⌁ favorited Steve Dixon's discussion Zambia, Clarke 1880, ARC 1990 Help
May 2
ciro Sugameli replied to Steve Dixon's discussion Zambia, Clarke 1880, ARC 1990 Help
"http://www.hartrao.ac.za/geodesy/THEIGSST.htm Interesting paper "The IGS Station and its Role in Land Delivery in Zambia" https://www.colorado.edu/geography/gcraft/notes/datum/edlist.html"
Apr 24
ciro Sugameli replied to Steve Dixon's discussion Zambia, Clarke 1880, ARC 1990 Help
"There is an interesting article in Photogrammetric Engineering e Remote Sensing of Oct 2004 signed from prof. Cliff Mugnier that shares parameters from Arc Datum 1950 and Wgs84"
Apr 20
Steve Dixon posted a discussion

Zambia, Clarke 1880, ARC 1990 Help

Can anyone share the transformation files for ARC 1950 for Leica Geo Office? I am trying to process data near South 17d latitude and East 31 Longitude. if you had a geoid file for the area that would help a well.See More
Apr 18
Steve Dixon favorited Adi Subono's photo
Jan 27
Jacques Detmar replied to Steve Dixon's discussion Tunnel boring alignment
"http://www.moussystems.nl/nl/producten/lasers.html A product from The Netherlands, It can made a verticaal laser-line. "
Dec 21, 2017
Kim Noblitt favorited Steve Dixon's discussion Tunnel boring alignment
Dec 1, 2017
joseph Uy replied to Steve Dixon's discussion Tunnel boring alignment
"This method is tested for accuracy and practical. No need for sophisticated tools. "
Nov 28, 2017
⚡Survenator⌁ favorited Steve Dixon's discussion Tunnel boring alignment
Nov 25, 2017
Steve Dixon's discussion was featured

Tunnel boring alignment

Any suggestions on how to set an alignment for a TBM 25 metres down a shaft? I need two points at the bottom for the alignment but can not see down into the hole. The dimensions of the hole are 3 metres wide by 6 metres long (usable space at the bottom).  the bore is 300 metres long so any error in the setout of the points at the bottom will make a great big ops at the end.See More
Nov 23, 2017
Steve Dixon replied to Steve Dixon's discussion Tunnel boring alignment
"Thank you for the responses all really good stuff. I think I am going to try the resection to confirm my work. I did use a string line strung between two surface nails on line and an optical plummet to align myself  along the string at the…"
Nov 23, 2017
Juan morales replied to Steve Dixon's discussion Tunnel boring alignment
"the better way for me is rent a laser proyector to transport a coordinates vertically to the bottom of the shsft, and a giroscopic theodolite to transport your azimuth from the surface."
Nov 23, 2017
Dave Ibbo replied to Steve Dixon's discussion Tunnel boring alignment
"The simple answer is don't worry about the tunnel just yet. Drill and locate prisms on the top of the beam mounted on spigots. Ensure these prisms are geocentric, ie whichever way you turn them, the centre will be the same. Once coordinated…"
Nov 23, 2017
James Jones-Hughes replied to Steve Dixon's discussion Tunnel boring alignment
"This is what I would do: If you can, set up four or five retro targets around the top of the shaft and resect to all of them (using a 90 degree eyepiece - maybe rent one because they're pricey). You might need someone to hold up a target…"
Nov 23, 2017
Jerry Anderson replied to Steve Dixon's discussion Tunnel boring alignment
"Well, it's VERY old school, but also very precise.  We used piano wire for a plumb-bob string (actually used 6 lbs of lead) lowered into 55-gal. drums filled with oil.  (Could use smaller barrels) Determine a precise position on the…"
Nov 23, 2017

Profile Information

I am here because I am a.
Just a surveyor
Surveyor Bio:
long time surveyor interested in what others are doing, keeping current.
Company
Opus
Location for Member Map
Alberta, Canada
Licenses Certifications or Awards
ASSMT, AIMS
I have experience with the following
GPS, cadastral, topographic, boundary surveys, construction staking, topographic surveys, control network surveys, Survey Office, Equipment Sales, Aerial, Construction
How many years have you been surveying?
30 years
Most comfortable with the following types of instrumentation
Total Stations, GPS, Surveying Software, GNSS, Old school surveying

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