UEA successfully completed the pilot bore using their Guided Boring Machine (GBM) pilot tube system which was previously untested in these conditions. In doing so UEA was able to maintain critical path and guarantee the program of works. The GBM system performed admirably and accurately – placing the pilot bore to within 20mm over 70 metres.
The risk of using the GBM in these conditions is greatly reduced as the rods are fully retractable and recoverable and the system is quickly and easily setup and removed from the pit. In addition, UEA was able to backup this technique with one of their HDD machines to complete a drive should ground conditions become impassable.
The 1050mm sleeve was inserted with a McLaughlin 36/42c auger boring machine. Site Supervisor Tom Martin said “We were able to operate the borer at full potential with the (GBM) pilot to keep us on course through rock. We spent a day on the pilot but we easily made this back up with the borer. The client is happy with a straight bore and we can feel happy a good job was done.”
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