Project Overview

We were commissioned to undertake microtunnelling, shaft construction and finishing works as part of our contract the main contractor Advance Plus, working on behalf of United Utilities.

Two parallel tunnels comprising of 95 metres were completed using our sister company's owned Herrenknecht 1800AVN machine.

The shafts were constructed by caisson method and were 7m and 9m in depth. We also constructed the headwall for both the shaft and a Weir Wall in the reception shaft.

We worked closely with the client’s M&E contractor to provide man rider, water tanks, flow meters and excavators to ensure a smooth transition and handover of work on programme.

Added Value Contribution by JGL

We provided advice to the client on redesigning the reception shaft. The original design incorporated drum shutters; however, we proposed using tunnel pipes instead, which benefited the programme and reduced overall project costs.

Our in-house design team based in Leeds, provided all the temporary works designs for the project, including the headwall, drum shutter and backwall design together with the jacking force assessments and settlement analysis reports.

Challenges

Two of the biggest challenges encountered on this project were the geology of the ground conditions and the impact of the poor weather conditions.

Through careful planning, continuous monitoring and splitting the pump system in the shafts, we were able to complete the project within an acceptable programme agreed with the client.

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