Ground conditions consisted of unstable fine sand which has seen other contractors undermine the main highway throughout the Gold Coast precinct. UEA Trenchless did not experience any undermining or over excavation subsidence on the drives using the pilot tube microtunneling method giving the principal contractor Baulderstone confidence that strict tolerances of grade and safe clearance from existing infrastructure could be constantly met.
Once the steel enveloper pipe was installed the DICL pipe was inserted using an auger boring machine to jack the pipe through, after which the annulus was filled with an approved grout mix.
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Image Caption: Guided Boring Machine in the entry pit inserting the pilot tube.