Microtunnelling, Tunnelling

UEA Trenchless completes thrust boring projects

The first thrust boring contract was part of the Gold Coast Rapid Transit Project, which saw UEA contracted to use thrust boring methodology to supply and install 900 mm steel casing to carry 600 mm concrete storm water pipes along the Gold Coast Highway.

Trenchless Technology had to be used to install the steel casing because the new alignment passed under an existing Energex pad mount substation which could not be diverted. Thrust boring at these diameters was the preferred method due to the existing ground conditions of flowable sand.

Baulderston managed the Broadbeach site, which was extremely congested with Stage One construction works, and existing road and pedestrian traffic. Energex were onsite while the thrust boring machine was operating to monitor their live assets located in the work zone.

The Gold Coast Rapid Transit project is a 13 km light rail corridor that will run from one end of the Gold Coast to the other servicing the new Gold Coast University Hospital, Griffith University, Southport CBD, Surfers Paradise and Broadbeach.

UEA Trenchless have also completed work on a new sewer rising main on the Unitywater network, installing 24 m of 700 mm steel casing/560mm PE pipe under Pitt Road, Burpengary. Thrust boring was the preferred method for this design given it was a large pressure sewer passing under a busy road.

Ground water persisted to fill the working environment and made it difficult under foot at times. UEA excavated a sump hole and pumped out the ground water continuously during work hours. Once the PE pipe was installed, grouting was completed and left for CLM to continue with the pipeline.

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