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Multi-Purpose Hydraulic Drill Rigs:
Interoc AN 160
The crawler drill AN 160 is intended for heavy duty anchor
drilling and micropile drilling applications requiring large-diameter or long-reach
drill holes.
The machine frame houses a robust 229 hp liquid-cooled Deutz Diesel engine with
latest turbo-charger and intake-air cooling system. This power unit features an
ecofriendly fuel-saving EMR (electronic engine control) speed governor which means
no exhaust-smoke discharge when load changing.
The hydraulics unit operates on the load-sensing principle and can run on biologically
degradable oils. The high drive power output ensures that the drill heads are always
well supplied even when the drill rig is operating at maximum duty when equipped
with large version of TIS doublehead system.
The drill mast mounted on the AN 160 is designed for running 118.11" extension drill
rods when fitted with doublehead drill system.
A new type of patented rod/casing magazine allows the drill string to be fitted
and removed quickly and safely. The magazine can hold as many as 7 double-rod Rigs,
comprising 118.11" long sections of inner rods and outer casing up to 8.6" in diameter.
The drill-strings are lifted from the magazine racks by a hydraulic manipulator,
which then swings them into line with the drilling axis. The same procedure is employed
for drill-string removal, with the manipulator returning the inner rods and outer
casings to their racks.
For overburden drilling, as used for example for anchor jobs, the inner string is
detached first and replaced in the rack. After the anchors have been inserted in
their holes the outer casings are slid back into the racking system over the inner
rods. The sections are then ready for the next twin-rod drilling phase. A time-consuming
part of the working cycle is eliminated and the overall drilling time is significantly
reduced.
The twin-impact system also helps cut down on the drilling time. The TIS allows
rotary-percussive drilling with both the inner rod and outer casing simultaneously,
even with the two drill strings counter-rotating. As the Twin-Impact System allows
to drill rotary-percussive both with inner rods and outer casing even in counter-rotation,
this results in a reduction of drilling time.
For easy drilling jobs the system operates as a conventional doublehead system.
The inner rod is in rotary or rotary-percussive mode, depending on the procedure
selected, while the outer string is rotary driven.
When drilling in hard strata, for example when boring through erratic boulders or
when bonding anchors in solid rock, the standard equipment is often unable to achieve
a satisfactory drilling performance because the outer drill string cannot keep pace
with the drilling advance of the inner string. In such circumstances the hydraulic
drifter fitted to the TIS unit is advanced by a hydraulic cylinder towards the rotary
drive so that part of the percussive energy is transferred to the outer drill string
via a striker insert mounted on the shank end of the drifter and a movable sleeve
which flits along the rotary drive. This energy can then be used to boost the drilling
performance available at the annular drill bit, thereby substantially reducing the
hole drill-out time.
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 Click here to download a pdf version (English)
Click
here to download a pdf version (Metric)
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