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Watch Video Specific aspects: 20,000 year old glaciers formations are now boulders stacked up to 400m high up the slope in several sections. Due to Snowy 2 requiring more lane width for huge plant/equipment, extra widening of the existing single road access track was critical. Engineers consulted with Spec Geo to design the following:
Galvanised 38mm hollow bar drilled from 9m to 45m per bolt. A total of 20,000 metres installed.
Custom temporary catch fences above each site supplied and installed by SG.
Single twist high tensile mesh applied and tensioned to boulders.
Coloured shotcrete applied in various sections.
Access: Pre cut single lane benches for all plant and equipment along a heavy utilised access road for construction of the Mighty Snowy 2.
Watch Video Specific aspects: Australia’s Largest Rockfall ATTENUATOR was designed and Built in a total of 10 days/5 rail shutdowns/2.5 years including set out and survey where Spec Geo completed the final design and layout for client. This ensured system would work as designed by manufacture.
Summary: A large loose section of natural sand stone escarpment presented trains with the risk of rocks hitting the train or network system.
Access to site: Extremely difficult access through narrow gates, steep hills whilst the entire region was under active rockfall conditions.
7 to 9m ground anchors supporting all components.
3m height per post/over 25m on average including mesh drape.
Pre cast footings designed and transported to site.
Custom made drill rigs and rigging gear to suit this contract strictly.
Watch Video Specific Aspects: Large boulders were presenting climbers and walkers with a risk of detaching and falling into the public access route. Several 4mtr CT Rock bolts were drilled, placed and grouted to eradicate the rockfall risk.
Access to site: EXTREME-REMOTE
Helicopter lift all plant & materials.
1.5 hour climb in and out daily.
720metres above sea level with severe wind conditions.
Watch Video Specific Aspects: A large section of massive sandstone had become loose and fell over 100m below the walking track. However a further 100m3 of boulder remained hung up on or above the public walk way. Spec Geo was commissioned to implement a solution and follow through with the removal of remaining blocks by use of drilling and blasting. A final ripe access groom of face ensured that the area was free of rock fall risk.
Access to site: 20min climb in and out via rope access.
Watch Video Specific Aspects: A large rock had come dislodged and made its way down the slope impacting a passing passenger vehicle narrowly missing the occupants.
Spec Geo was engaged to install Australia’s Largest Rock Catch System in very challenging conditions. Approximately half of the fence was in fairly easy access conditions with the upper fence proving to be extremely challenging within the rainforest canopy. SG had to engineer systems where minimal impact of the install could effect the precious natural habitat.