First, I apologize for this thread detour. ?ÿFeel free to ignore this line of questions. ?ÿ
Is the potential $ amount for reduction in payment to the contractor significantly greater than the $ amount to be paid to the as-built surveyor? ?ÿThat is one heavy weight on the surveyor??s shoulders.
What is the desired slope? ?ÿWhat is the acceptable tolerance?
How far out of tolerance costs how much money?
What good does this reduction in payment serve? ?ÿWill the pipe continue to function?
Again, I apologize for my insolence. ?ÿNo ill will is intended. ?ÿOnly curiosity, education, and understanding.
Thanks for listening.
Brad
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I don't know the contract/payment details.?ÿ There needs to be some incentive for the contractor to do the work correctly.?ÿ For this I think a reduction in payment for being out of spec is appropriate.?ÿ If it gets to bad maybe they should make them remove and replace.?ÿ Tearing it out and replacing it would really be a serious problem.
I haven't heard what they decided for the first section that got messed up last fall.?ÿ It was so cold when they tried to grout that the grout wouldn't set properly.?ÿ The pipe floated, they jacked it back into place and it floated again and the grout set up.?ÿ I haven't seen it just been told about it.
It's sort of a unique project.?ÿ When we contracted to do it I didn't realize we would need to as built as it is turning out.?ÿ This is one for the scrap book.?ÿ They very well could decide not to have us survey it, but last I heard the engineer did.?ÿ Maybe he's just applying pressure on the contractor to do it right, as, it's going to be as built by an independent survey.?ÿ The contractor seems OK with us doing the check, even said Thanks, most people won't thank them for working on this problem.?ÿ Maybe I won't either after it's done!
A SLAM/scanner cart could be a solution. As the hangars are already there the SLAM solution will have common point patterns to keep the OTF registration tight. I've used a handheld SLAM scanner on a 2200' tunnel, but maybe 7100' is a tall order to keep the registration tight (you have to include targets at either end to check the closure anyhow). Here is one model on a cart:?ÿwww.navvis.com/m6
I have used the GeoSlam for about 5-10 projects and I have found it to be a huge waste of time for civil applications. It is no good for elevations and tight coordinates. You would have to georeference the whole thing anyways so why not just scan it with a survey grade scanner?
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This may not be the best solution, but maybe you could reach out directly to these fine folks ?ÿ ?ÿ ?ÿ( they are pretty smart ).
http://www.carlsonsw.com/products/laser-measurement-devices/c-als/
As far as the invert goes, the contractor has a good idea.?ÿ See how the water flows.?ÿ If good grade there won't be but minimal ponding from humps or low spots.?ÿ He still thinks the engineer is going to want an as built survey.?ÿ I'd be fine if they cancelled us.
I'd be fine if they cancelled us.
A-men, brother.
Maybe the engineer will sign off on selective local as-builts at areas with ponding only, if it is question of minimum slope only it seems like it could be done with hand tools if the puddles are stable.
Article in the recent POB about a pipeline as-built:
https://www.pobonline.com/articles/101421-pipeline-survey-meets-challenges-and-deadline
