Due to the complexity of the bore, UEA engaged the services of a steering engineer and a Paratrak 2 system. UEA utilised one of its 45 tonne Vermeer D100 x 120 HDD rigs to undertake the pilot bore which was completed in twelve days and within 30mm of the required intersection point.
Site-specific challenges included maintaining the grade, working in a densely populated area of Sydney, intersecting an existing manhole and working with limited room for the new polyethylene pipe sting.
The design of the project allowed UEA to utilise PDC forward reamers with all cuttings and drill mud returning to the drill face. UEA chose to upsize the hole in two passes – an initial cut of 13 inches and then a final cut of 18 inches. Upon completion of the ream UEA pushed the pipe into place.
For more information about this project or UEA Trenchless, please send enquiries to Steven Hopkins.