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R.I.P. T.B.M.
Posted by brad-ott on May 16, 2011 at 11:00 pmBrad Foster replied 13 years ago 16 Members · 17 Replies- 17 Replies
It’s still useable.
It might not be dead, merely awaiting reincarnation. They could reset the pole somewhere, complete with TBM and marked elevation!
Paul and Jim nailed it. It ain’t over till it’s over. Good elevations never die!
Don
They’ve already measured the new location for the bench. See the paint?
Cut that section out and put in the bed of your pick-up.
You’ll always have an elevation when you need it…works great!
Rick
The bumper hitch is still the best T.B.M. as it’s always there when you need it.
quick – pull that spike out of that pole and nail it in that stop sign before you loose the elevation on it!
Oh the funny games we play on the new guys!
That pic reminds of a story I heard about an office guy running GPS. This happened back at the first company I worked for after college. It was raining and the party chief got a call over the radio from the office guy, and the guy says to the party chief, “I didn’t know what to do about the rain, so I held an umbrella over the antenna. These things aren’t waterproof, are they?”
Snoop
Do you know who that is or where the survey was. Unfortunately I do.
Andy
Snoop
yeah, i know the guys that initiated the prank. don’t know mary poppins, but i have heard the story about him.
A few years ago, Dr. Roy Dokka and I gave a one-day seminar on subsidence in a town in Southwest Louisiana (Cajun Country). After it was over, one fellow came up to us and proceded to bawl out Roy for “screwing up” his past 20 years of surveying and his entire database of TBMs. He contended that subsidence was our fault …
🙂
I’d be a little worried about what the metal ribs in the umbrella do to the phase of the GPS signals.
.And just a word from a previous public works employee. I have seen many projects, mostly road widening, where the poles with BM’s still attached have been moved back 5 or so feet but no longer are anywhere close to the original elevation.
And don’t get me started on BM’s on Fire Hydrants.
I notice someone used the technique of nailing some lath on the pole to document TBM information.
Can’t tell if there are two lath? We used the top one as a shield for the bottom one to prevent fading of the written information. Can’t remember the last time I had a construction project of sufficient duration for felt pen numbers to fade in the sun.
Yep, poles and fire hydrants have a way of moving around. I recall using a County Surveyor brass disk in SoCal that was set in the top of a drop inlet on a major street. A year later, I hit the same bench mark, which was still set in the same top of the original drop inlet. Unbeknownst to me and the County, apparently, the top had been cut off of the original inlet, which was reconstructed with a new bottom and the same top. Two feet different. Cost me a lot of redo and recheck. The original disk had no new information stamped on it and the record did not reflect any move.
I always have wondered how many other projects were based upon the same brass disk, with the original elevation.
JA, PLS SoCal
R.I.P. T.B.M.> Let’s get Deral going on Fire Hydrants!
The FEMA maps around here list tons of BM’ on Fire Hydrant bonnet bolts. I had a project in Dennis, near the water, and the closest BM was a FEMA BM on a fire hydrant. The engineer on the project told me that he had transferred an elevation form the FH to the site.
I told him that I ad just read that Dennis was replacing most of their FH’s and it ws obvious that this was one of them. It was raised above the ground significantly with about 1.5′ of the base above the ground level.Well I had to run another level loop in to the site (thank god i did!) only to find that everything was proposed about 2′ low. No harm no foul, but it pays to verify!
Man, I would never have imagined something like that happening. Something else to worry about digging up control on my next topo…
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