- United Utilities
- Main Contractor:
- Advance Plus
- 14 weeks
- Providing advice to the client on changing the design of the reception shaft to benefit the programme and reduce costs,
- Given the challenges exposed on the project our outputs and timescales of delivery were commendable,
- Our internal design team recommended alternative designs that offered greater value to the client.
Contact usTo hear about our experiences and how we can help you.
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 also worked 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.
Two of the biggest challenges encountered on this project was the geology of the ground conditions and the impact of the poor weather conditions.
Through careful planning, monitoring and splitting the pump system in the shafts, we were able to complete the project to an acceptable programme with the client.
Added Value Contribution by JGL
Providing advice to the client on changing the design of the reception shaft as the original design showed drum shutters but instead we proposed using tunnel pipes to benefit the programme and reduce total 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.
Explore related content
Tunnelling is a service that requires a wealth of experience, due to its wide range of sizes, shapes and environments. Our Shield Driven Tunnelling solution starts from 1.2m diameter tunnels to 7.15m.
Appointed to design and build both the temporary and permanent works associated with the build of a drive shaft and a 146m long microtunnel, as part of the Tolmount Gas Pipeline Project.
The efforts of our team to construct a new service tunnel for the new Traction Substation (TSS) at Euston station impresses HS2 CEO Mark Thurston who came to see the team's impressive work first hand.