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Electric Häggloader keeps hydro tunnel green Jul 2011
Gia Industri AB News Release
A GIA electric Häggloader is meeting its green credentials for Norwegian tunnelling contractor Haehre Entreprenør. The recently-delivered GIA 10HR-B Häggloader is meeting all expectations of zero CO2 emissions while working on the Holsbru Kraftwerk hydro-power project near Øvre Ardal, 300km north-west of Oslo.
GIA Häggloader operates at zero CO<sub>2</sub> levels

GIA Häggloader operates at zero CO2 levels

Haehre ordered the Häggloader to operate on two faces removing rock following drill+blast operations in the 6km tunnel extension which, when complete, will allow Norsk Hydro to utilise previously unused mountain lake and river water resources.
With a cross-sectional area of just 20m2, conditions are ideal for using the rubber-tyred electro-hydraulic driven trackless loader. Featuring a hydraulic system powering an electro-hydraulic drive, to provide low installation and energy costs, the GIA 10HR-B also ensures good quality air with no CO2 emissions.
Using an underground jumbo drill rig, Haehre are drilling 65 holes on each of the two faces to a depth of 4.6m and achieving a rockfall of 86m2 with up to three blasts on each face per day.
The entrance at the Norsk Hydro tunnel extension

The entrance at the Norsk Hydro tunnel extension

Featuring a load speed of three to four cubic metres per minute has, according to Project Manager Ernst Ove Johansen, helped ensure a fast cycle rate loading the contractor's fleet of 9m3 dump trucks. Advance rates are up to 12m/day on both faces.
When the Häggloader leaves the face – to park in a niche during further drill+blast activities – it can operate on diesel power, reverting to electric when inside the tunnel.
Work on the hydro tunnelling project started in June 2010, with completion due in February 2012.

           

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