Metal Rod Bench Marks?????

[+Team RAGAR]

This may sound silly, but does anyone know what a Metal Rod Bench Mark looks like. I think I found one but I am not sure. There are many listed in my area, zip code 44146. Check out MB1804. If you can help me please reply.

[2oldfarts (the rockhounders)]

Here is a link to one that is a metal rod. Our log has 2 pictures to go with it.

 

GP0480

 

John

[+Black Dog Trackers]

TEAM RAGAR -

 

Check out this cool website done by DustyJacket. It has pictures of all kinds of survey markers!

[+Harry Dolphin]

Here's one (of a pair) that we found at Blairstown Airport. Our metal rod came with a cover (and slugs).

KV5855

[+maconart]

Most of the marks above are "Stainless Steel' " Rods. Other rods were put in many years before these. Here is an example of a rod that may help in your visual library. This one is from EF1264 in Alabama.

 

PID=EF1264My Webpage

Edited March 22, 2005 by maconart

[Z15]

That is a water shut-off IMO (EF1264)!

 

Does not resemble any NGS mark that I know of.

 

Older rod marks are copper clad steel set inside a 6-inch iron pipe and may or may not have a survey disk fastened to the top of.

Edited March 22, 2005 by Z15

[+BuckBrooke]

Consider also that EF1264 is SCALED, and the odds of it actually being at the coordinates are very slim.

[+Crusso]

Benchmark Manufacturer

 

This website has lots of pics and other info about benchmarks. Some really cool (geeky) stuff here.

[+McMurdo1]

I found six metal rods in this series yesterday. All had caps on them.

[+Renegade Knight]

Rebar with caps anymore.

 

1/2" or 5/8" depending. I'm not sure what they used in the days of old.

[Z15]

Rebar with caps anymore

 

Non Stainless-Steel and rebar are not good for use as bench marks.

 

Rebar (re-enforcing steel for use in concrete) has ridges to grip concrete, those ridges will also grip the earth and corrode. If the earth moves with frost, so will the mark.

 

So if you find any steel rods you suspect are a bench mark, chances are good you may have the wrong mark.

 

I am aware of some old Tri-angulations marks that are iron pins but those are mainly from back in the old days. Modern geodetic work will avoid using iron if at all possible.

Edited March 24, 2005 by Z15

[Prof. Y. Lupardi]

Our new Dutch markers that are to be used by surveyers with their professional GPSr and have millimeter accuracy (and height) are made of a rod of stainless steel about 170 cm long that has a kind of shipscrew on the end. They are screwed into the ground. until the top is below the surface. Then a concrete protection with a lid is made. Like this one here that you see in use:

http://www.geogames.nl/meetpunten/showgall...=200320&cat=511

[Bill93]

Frost isn't the only thing that moves benchmarks. I though GH55 was going to post this one but I haven't seen it so will supply a link: MH0498 being lifted out of the ground by a vine root.

[+RustyBeerCan]

these new Benchmarks a GREAT idea!

lots of room for TravelBugs

Edited March 26, 2005 by rustybeercan

[Bill93]

>lots of room for TravelBugs

 

I couldn't tell if you were joking. This is a BAD idea.

 

BH

[evenfall]

Yeah,

 

I can tell you that the travel bugs would travel alright. If a Government or Municipal Surveyor looked in there, that would likely be the last time they were seen. Not so much out of arrogance either, they would simply be doing their sort of maintenance on the station... We all routinely clean out what we find in these things. It is just the way it is.

 

Rob

[2oldfarts (the rockhounders)]

No sense of humor? I guess that laughing frog is to hard to understand.

 

John

[grannyoldr]

Here's two we found around here yesterday:

 

AA3625

 

AA3626

 

I love the orange carsonite witness posts. They make things easier.

[evenfall]

Yeah John,

 

Most Surveyors have not been introduced to the Laughing frogs... Some are none too certain of the world beyond the windshield of their Chevy Suburban either :-)

 

You'll have these things...

 

Rob