North Sitra Sewage Scheme

North Sitra Sewage Scheme

Challenging ground conditions and non-disruptive methods

Following a competitive tendering process Joseph Gallagher Middle East were awarded this challenging project to install various sewer pipelines in North Sitra. The microtunnelling involved installing 6 metre long steel sleeve pipes which acted as carriers for the new sewer pipeline.

Key considerations included; the requirement to use a Non Disruptive Road Crossing (NDRC) method due to the location of the critical roads that the sewer pipeline would pass under and also the tidally influenced ground water conditions in North Sitra.


Our chosen microtunnelling solution was the ISEKI TCS 600 Rock Machine, which offered the client a complete TBM system with rock cutting capabilities to a full separation system that recycled the water that was used in the
slurry process.

Early into the tunnel drive the ISEKI TCS 600 encountered a mixed face of rock and sand with cobbles and boulders on the tunnel horizon. Although this slowed production slightly, the combination of our experienced operators and the capabilities of our microtunnelling machine dealt extremely well with the rock, boulder and sand interface, completing the installation successfully.