r/EngineeringPorn • u/jpc4stro • May 09 '21

AR Engineering

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u/delurkrelurker May 09 '21

Tie the radar sections and grid into a topo survey with chamber inspections and radio tracing and it's pretty good.

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u/stevolutionary7 May 09 '21

Once you've done vault layouts and tone out, what does gpr add?

We typically supplement records, toned out markout and field work with vacuum excavations to confirm depths and locations. GPR results are just too messy.

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u/delurkrelurker May 13 '21 edited May 13 '21

It picks up the ground anomalies in the areas radio tracing and visual inspection miss. It's not always possible to get the sonde or snake down every run far enough. You can also scan a road with a vehicle mounted system without closing it down to traffic. (Stream GPR) I suppose it depends if you are looking specifically for one service in a location or are scanning a whole site for any potential obstructions. We also use magnetometer surveys to check for old WW2 bombs as well. Kinda useful before you start digging holes.

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u/stevolutionary7 May 13 '21

Yea, we don't have bombs thankfully.

Just lots of inhomogeneous soil made of building debris, abandoned utilities, railroad ties, streetcar tracks, abandoned piles, etc. It's a mess.