In September 2015, UEA’s Trenchless Division was contracted to install 48 metres of DN900 RC Storm Water Pipe using their Akkerman Laser Guided Boring Machine, combined with their Robbins Conventional Auger Boring Machine. The works were located on Stewart Avenue in Blacktown. This project formed part of drainage works associated with site subdivision works for the Fairwater Residential Development.
UEA successfully completed the bore and RCP installation Friday 2nd October.
The scope of works consisted of:
- Guided Boring Machine (GBM) to undertake and complete the pilot bore to designed grade accuracy, as the ground conditions were suited to GBM
- Install 48m of 1050mm mild steel enveloper pipe using Robbins Auger Boring Machine
- Jack in DN900 RC Product Pipe to replace the mild steel enveloper pipe
- Geotechnical Information for the bore – SHALE, Moderately Weathered – pale brown Class IV-V
- With the known ground conditions, UEA opted to use an in-house designed cutting head on the GBM to complete the on grade pilot bore. This was completed within 8mm of design accuracy, in comparison to the industry standard of +/- 25mm
- Using a bearing swivel, the lead auger was connected to the pilot tubes and the mild steel enveloper was installed on grade with the Robbins Auger Boring Machine
- RCP was jacked in to replace the mild steel enveloper. As the RCP progressed, the steel enveloper pipe was removed from the receipt pit.
- The installed RC Product Pipe was installed within 20mm of the required design grade
- GBM Pilot Bore was set up and completed in one day
- The mild steel enveloper was installed in 2 days
- The RCP was installed within one day
The crew, together with the client’s team who were responsible for spoil removal, worked together in an efficient partnership to contribute to the success of this project.