We're installing a new under-ground sewer pipeline in Jindalee to replace the existing pipeline underneath the Centenary Highway, which will be decommissioned at project completion.
Why is the new sewer pipeline being installed at this location?
The new pipeline is being installed between the Centenary Highway sewer pump station and Seventeen Mile Rocks Road, Jindalee to allow for the new pipeline to connect to the existing sewer network.
Construction of the new pipeline
The new pipeline will be installed below ground using a combination of trenchless technology and open trench construction. Most of the construction will be completed by the trenchless technology known as horizontal directional drilling (HDD), to minimise impacts to residents and the environment.
Three temporary work sites will be established along the alignment to allow access for the HDD Rig and machinery. Most of the above-ground works will occur at these locations.
What to expect during construction?
During construction, nearby residents and businesses may experience some noise and dust from machinery increased vehicle movements and minor vibration during the drilling activities. The project team is committed to minimising the construction impacts where possible during project delivery.
The works will be delivered in partnership with Fulton Hogan.
About horizontal directional drilling
Horizontal directional drilling (HDD) allows pipes to be installed underground to minimise the need for surface disturbance through open trench activities.
Drilling activities require an entrance pit to be excavated adjacent to the drill rig, size of the pit is determined by the depth and width of the pipe.
The HDD process uses a mud material to keep the cutting drill head cool, lubricates the borehole and flushes the excavated soil back to the entrance pit. The returned mud material is sifted to remove bulk particles and reused.
To track and guide the drill head to the designated location, a transmitter or steering tool is located within the drill head which sends a signal with the exact coordinates. Once the drill is near the designated location, an exit pit is excavated and the drill comes to the surface.
Once the initial borehole is completed, drilling activities continue to increase the size of the borehole to the required diameter.Polyethylene pipe is the preferred choice for trenchless installations because of its flexibility and strength using directional drilling construction.