A construction company asked me about give them an accurate section of a shaft elevator (their tollerances are 3mm).
My first thought is laser scanning but how I will apply control vertical?
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As the height is 90 meter at least.
never done this...just some thoughts. I am assuming there is an elevator present.
Put the scanner on top of the elevator car, and take a scan every floor. There should be enough overlap to register the scans without any additional control.?ÿ
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I've never done this either, but I'm pretty sure that a laser plumb will be involved in the ultimate solution
When I did it previously, I would scan at the lift pit and also at every level opening to ensure I have good coverage. I have controls that I shoot with my total station to prevent any drift in vertical or horizontal.
Did this on 15 stories once albeit the car wasn't installed yet.?ÿ We started in the pit as well.?ÿ We shot control into the pit and checked out to control at the top.?ÿ We used globes to help with stitching.?ÿ The shaft is too redundant to not use something.?ÿ Just make sure you put the globes in different spots utilizing several floors at a time.?ÿ If I recall, we setup in every other or every third floor opening.?ÿ We also utilized a total station steel column clamp to get the scanner out in the shaft.?ÿ Just reminiscing about all of this makes me want to vomit from anxiety.?ÿ Mounting, unmounting and having a $XX,XXX Leica P40 dangling out in the air was not for the faint of heart.?ÿ I think we only lost one globe.?ÿ
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@jflamm?ÿ
Company I worked for had a P40 in the pit and summarily got destroyed when some jackhole up on another floor 15 or so stories up decided to use it as a trash chute that day. The reality that someone would have been killed was a far greater topic of discussion than the dead scanner. Special Surveying is a cool niche for the right people for sure. Thanks for the photos and for sharing.
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I would set control at the bottom and at every floor with this one.
A very basic video about transferring control but you get the idea.
@jflamm?ÿ
Company I worked for had a P40 in the pit and summarily got destroyed when some jackhole up on another floor 15 or so stories up decided to use it as a trash chute that day. The reality that someone would have been killed was a far greater topic of discussion than the dead scanner. Special Surveying is a cool niche for the right people for sure. Thanks for the photos and for sharing.
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Holy Sheet!!?ÿ The P40 becomes an afterthought when lives could have been involved!?ÿ?ÿ
@jflamm?ÿ
Yep.
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They were still trying to get paid for that after I left too, again glad no one but the gear was injured.
It was literally destroyed.
Setup your Robotic TS in the bottom of the shaft. Remove the handle from the TS to shoot vertical. Turn the prism sideways, pointing towards the gun. I use magnet mounts at each floor to set vertical control. You can make a horizontal tripod for use with a scanner such as Faro 150 or Leica RTC360.
Here is a good site to review the procedure.
https://www.laserscanning-europe.com/en/news/scanning-elevator-shafts-using-horizontal-tripod
I was going to suggest using a jig, the same in the method?ÿ@leegreen?ÿlinked
Use some spherical targets to help with the registration tie-in on the way up and close out on control transferred top. So basically the way @jflamm?ÿsaid he did it but using the jig?ÿ
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Otherwise just fling it down on a cable like these guys (don't think it'll be 3mm accuracy though?ÿ????)
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