A new challenger to the conventional rotary rigs
The ROC L8 down-the-hole surface crawler is the largest of the Atlas Copco rigs. It spearheads the company’s entry into large-scale operations at high production cement and limestone quarries and large open pit mines for hard rock applications.
The track oscillation and low centre of gravity makes travel quick and easy and set-up is fast. In addition, drilling flexibility (+/-30° sideways, +30° forward) in combination with the boom swing (-20° left and +25° right) will tackle the most demanding conditions. Tramming speed is 3.4 km per hour and 6 m-long drill tubes mean fewer joints. And the magazine contains eight tubes – which can randomly be selected to provide an even tube wear.
All these factors together contribute to more flexible operations and make more time available for drilling – adding up to higher productivity.
A powerful 317 kW (431 hp) CAT 3196 ATAAC engine, which is water cooled, turbo charged and after cooled, drives the rig. The on-board screw compressor is an XRV 9 unit, which has a working pressure of 25 bar (363 psi) and delivers 405 l/s (858 cfm) to provide excellent flushing.
The rig’s main application is drilling holes of 105-165 mm (41/8"–61/2"). It is equipped with Atlas Copco COP DTH hammers ranging from the COP 44 (110-130 mm) and the COP 54 (134-152 mm) to the COP 64 (156-165 mm), which combine high performance with low fuel consumption. A double drill tube guide helps to achieve straight holes and easy collaring.
The spacious cabin is FOPS/ROPS-approved and fitted with a six-way adjustable operator’s seat. The operator also enjoys the advantages of a low level of noise, a perfect view during collaring and drilling, easily-accessible drilling controls in the armrests of the operator’s seat, and air conditioning as well as heating.
Additional equipment includes a hole inclination and depth control instrument – which ensures fast and accurate positioning, minimises deviation and control of drilling depth – a hydraulic support leg for stable drilling, a water-mist system for hole stabilisation, and an electric refuelling pump.
The ROC L8 DTH rig: Imposing appearance and high productivity.
Photo: no. 202076 (A4 size drawing)
ROC L8: High Productivity with Flexibility
Photo no 201636
Atlas Copco DTH-hammers, COP 44, COP 54 and COP 64.
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