Correction Direction; Positioning Of Drill Bit; Steering Steps - XCMG XZ320 Operation Instructions Manual

Manual of XZ320 Horizontal Directional Drill
3.7 Monitor various surveying instruments and shutdown is required for
inspection if any is any problem.
3.8 Drill bit shall be positioned by guide instrument after drilling for at least
half of length of auger stem.

4 Correction direction

Correction direction is operator's technique gained by experience
4.1
to equipment and soil conditions.
Basic operation steps are as follows:
4.1.1 An operator shall position drill bit by guide instrument and issue
operation instructions to drill operator during directional drilling.
4.1.2 Drill bit shall be traced during correction to compare current position
with drilling plan and steer drill bit according to demand.
4.1.3 Basic principle to consider during correction is as follows:
4.1.3.1 Steering ability depends on soil conditions, used drill bit, nozzle,
surveying data of drill bit and non-rotation pushing distance.
4.1.3.2 All machines shall be corrected gradually. Please refer to bending
extreme of auger stem. Excessive correction may damage auger stem and
cause difficult drilling and back towing so it is required to straighten as early
as possible for correction.
4.1.3.3 Do not push the entire auger stem into the ground if it does not
rotate because auger stem may be damaged by exceeding the bending
radius.

4.2 Positioning of drill bit

4.2.1 Drill bit parameters which can be gained by guide instrument include
depth, inclination, angle of tool and temperature, etc.
4.2.2 Compare with positions shown in drilling plan to define direction of
drill bit.
4.2.3 Rotate the power head until required time clock position is displayed
on the guide instrument;

4.3 Steering steps:

4.3.1 Adjust angle of drill bit.
4.3.2 Push the auger stem if power head does not rotate.
4.3.3 Check if direction can meet requirements or not by display data of
guide instrument. Stop operation then drill with rotation once reaches
required angle. (Steering of auger stem can not exceed permissible
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