Liebherr LB 16 - Manual (Page 6)

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6
Convincing leader concept
The higher the utilization of a drilling rig, the more profitable is its operation. Therefore the kinematics and leaders of
Liebherr rotary drilling rigs are designed for a wide variety of applications.
More stability for maximum precision
The parallel kinematics, which is exclusively applied in the Liebherr rotary drilling rigs, provides the unit with out-
standing stability and high alignment forces. It only allows for minimum deformation and thus guarantees maximum
precision, e.g. when installing foundation piles by drilling. Decisive advantages are due to the functions of radius
adjustment without inclination adjustment and radius adjustment without rope movement. The latter is possible be-
cause all winches are mounted on the leader. Moreover, the rig has a larger operating area without repositioning the
undercarriage.
Box design reinforces the leader
Since the leader is built in an especially rigid box design with a large cross section, it can absorb very high pull forces
and torques. Thanks to this robust design deformations are reduced to a minimum and lower surface pressure is
achieved leading to less wear and a longer service-life.
Rope crowd system for increased crowd force
For drilling operations the crowd force of the rig is of vital importance. Due to the high pull force of the LB rigs cased
boreholes of greater length can be produced without casing oscillators. This saves time and money. Using the stand-
ard rope crowd system the rotary drive can travel over the complete leader length, thus allowing installation of longer
casings. This saves time when connecting the pipes.
Kelly rope
Kelly bar
Rotary drive
Casing driver
Casing
oscillator
Radius
adjustment
Undercarriage
Leader top for Kelly rope
Leader top for auxiliary rope
Tensioning cylinder
for the crowd rope
Leader inclination device
Crowd winch
Kelly winch
Uppercarriage
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