We installed 1,400m of 1200 mm diameter jacking pipes using ISEKI Full-Face; remotely – controlled pipe-jacking machinery and laser-controlled steering. The shafts ranged in depth from 5m to 10m with 6m diameters for the Launch Shafts and 4.5m for Reception Shafts. The segmental shafts were constructed using the caisson method.

We worked alongside Kier in developing the tunnelling solution as an alternative to open cut. This approach mitigates the risks associated with deep excavations alongside the existing carriageway where there is the potential to encounter running sands.

• Contract completed incident free.
• Contract completed on time.
• Contract completed with no stakeholder complaints.
• No ground loss experienced as result of selection of the best pipe jacking method & equipment and top-class supervision and skilled operatives.
• No impact on other significant contract activities.

Design Services | Temporary Works

• ​Temporary works design for a 6 metre shaft and 4.5 metre diameter shafts for microtunnelling aspects of the project
• Auger boring jacking and ground settlement/heave analysis