Over the Top
The Laser can be set on a tripod or mounting plate above the excavation on the pipe itself. A
laser target is mounted on a pole and is adjusted to give the correct distance from the beam to
the pipe invert. For accurate line control, a level vial can be attached to the pole to ensure that
the target is held vertically. This is an excellent setup for shallow cuts for trenches where water is
present.
Instrument method-manhole
Grade rod
reading
Grade hub
C.I.
1. Attach the Laser to a tripod having a 5/8-inch x 11 thread.
2. Set the tripod and Laser on line behind the first manhole and insure
the system is level.
3. Suspend a plumb bob from the tripod or use a Laser Plummet over
the first point.
4. Transfer the elevation into the manhole using a level, transit, or with
your laser set to 0.00% grade.
5. Set a stake on the centerline of the pipe so the top of the stake is at
invert elevation.
6. Use the wireless remote to position the beam on the rod as you take
your readings.
7. Add your grade rod reading to your cut-to-invert
reading.
8. Set a target on rod at this distance. For Example:
Rod reading = 6.48
Cut-to-invert = 4.51
Set to = 10.99
Laser beam
Pipe
invert
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