Ditch Witch OnGrade - Manual (Page 29)

Conduct OnGrade Bore - 28
OnGrade Operator’s Manual
OnGrade Process Overview
CMW
10. Use tracker to locate drill head and take initial reading. See “Initial” on page 34. This reading from laser
plane to center of beacon is the target value for the bore.
11. Add pipe, drill in and take readings as directed below until drill head enters end pit.
• pitch: every 12-18” (30-45 cm) with drill head stopped
• depth: every 5-10’ (1.5-3 m) with drill head stopped
12. Take measurement from the laser plane to the top of the beacon housing at the end pit using surveying
rod and laser receiver.
Compare the measurement taken at the end pit with the measurement taken at the start pit. If the
measurements match, the drill head is precisely at the desired elevation. If offsets were used, add or
subtract the offsets out and then compare readings.
13. Remove drilling downhole tools and attach backreaming downhole tools.
14. Backream the bore and pull back product pipe using proper techniques for soil conditions and slope of
the bore. See “Process” on page 44.
IMPORTANT: Take pitch and depth readings at the same roll position.
Turning shaft will kill you or crush arm or leg. Stay away.
NOTICE:
• Tracker operator and drill operator should maintain two-way communication.
• Keep everyone clear of the exposed drill string.
• No one should enter pit until clear communication is given by the drill operator that the drill unit
is shut down. If using tracker control (see drilling unit), do not enter pit until tracker control is
turned off and green light on drill unit is lit.
• Drill operator should be instructed to discontinue drill string rotation as soon as drill bit exits the
bore. Use thrust only to extend drill string beyond exit hole.
Incorrect procedures could result in death, injury, or property
damage. Learn to use equipment correctly.
NOTICE: Follow U.S. Department of Labor regulations on excavating and trenching
(Part 1926, Subpart P) and other similar regulations