Shooting down a vertical shaft
Im on a job that requires me to be able to shoot down a 60m deep by 12m diameter round vertical shaft.
I have to shoot in an elevation to top of rebar that’s about 5m off the bottom and about 3-4m from the edge of the exterior walls.
I also need to shoot in forms for the shaft walls to measure plumbness and ovality.
The previous surveyor had 5 prisms on the top of the opening of the shaft that they tied in, the spun them 90 degrees down so they could do a resection from the bottom of the shaft. The down side of this is the terrible geometry. Does anyone have a better idea?
Im using a robot so I dont need to be able to see the targets but the angle is such that the instrument cannot just shoot in a control point on the shaft floor.
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