BANKA mk3 motor drill
The BANKA - powered mk3 is mechanized drilling rig based on the percussion principle.
The casing used is the 4-inch, 6-inch or 8-inch Banka type, and the cable tools are the same design as those of the Banka drill, only longer.
Simple mast, easy and quick to rigg, partly by hand, partly by its own power. Its legs are normally spread apart at 3.30 m..
Percussion, to sink casing string, is performed by a free-fall winch driven by a diesel-engine. The winch is hand operated by the drillmaster through a combined hand-clutch and brake.
Hoisting speed with cable on first layer: 40 m/min., while line pull: 15 kN max.
For easier handling, the rotation of the casing is done by means of a hydraulically driven rotary table. This table is kept in place by a telescopic torque arm which, at the other end, is anchored to the ground by pins, whereas the hydraulic power is taken from a hydraulic pump which is powered by the same diesel engine as the winch of the rig. The weight of the rotary table with torque arm partly takes over the ramming.
Withdrawing the casing remains unchanged, however the hollow screw jack is replaced by two hydraulic jacks placed under the rotary table, so that withdrawing the casing can be done by letting the table rotate the casing and jacking up at the same time.
Easy - with folded mast - preferably behind "Landrover" or pick up truck.
For depth of over 40 - 50 m, telescopic drilling is practised;
down to 40 m, a 6" casing (165 mm O.D.) is used, inside which
a 4" casing (121 mm O.D.) is lowered and drilling is continued upto
a maximum depth of approx. 70 m.
The BANKA mk3 is used for the investigation of alluvial ore deposits, for foundation testing, site investigation and shallow water-well drilling.
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