7. After rough positioning the transit over the bulls eye target, use the
transit's leveling base to accurately adjust the transit to the bullseye
target.
8. Once the transit is set over the Laser’s bulls eye target, sight the
transit on the centerline of the next manhole and lock the scope on
line.
9. Plunge the scope into the trench and set a stake on line 20 – 25 feet
(6 – 8 m) from the first manhole.
10. Use the line buttons to intersect the stake with the laser beam.
11. Look through the transit at the stake and readjust the beam until
it is aligned with the vertical crosshair of the transit.
12. Lay pipe - Set the pipe target in each new section of pipe and
adjust the pipe until it intersects the target’s bulls eye.
NOTE:
This method assumes that the manhole was set at the correct
elevation. If there is any question as to the manhole accuracy, check
the manhole and pipe invert elevation and transfer an offset to check
the line of pipe entering or exiting the manhole.
On Top of the Pipe
1. Line – Set the Laser until it is over the vertical centerline of the
pipe and pointing toward the next manhole.
NOTE:
It may be necessary to support the Laser with extra gravel,
dirt, or sub-base material.
Next manhole
Transit
crosshairs
No
Yes
No
Laser spot
Vertical centerline
Summary of Contents for DG613
Page 1: ...1...
Page 5: ...Illustration Set Up A 1230 B 1237 C 1248 1 2 3 4 5...
Page 32: ...Calibration Checking Calibration...
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