Innovative solution enables key pipe jack completion at Barn Elms
The design and build of a unique tunnel shield has proved instrumental in Barhale successfully reaching the main Thames Tideway Tunnel following a 215m pipe jack.
The civil engineering and infrastructure specialist achieved the milestone as part of the programme of works to build the West Putney Storm Relief Combined Sewer Overflow (CSO) at Barn Elms in Richmond, West London.
Barhale was awarded the main civils package by the BAM Nuttall Morgan Sindall Balfour Beatty (BMB) joint venture which is delivering the 7km west section of the 25km Thames Tideway Tunnel.
The connection tunnel has been constructed 30m deep within the London Clay Formation by a 215m long 2.5m diameter pipe jack which will be finished with a 2.2m internal diameter secondary lining. Through a vortex generator and a drop tube, it connects the newly constructed CSO drop shaft located at Barn Elms Sports Centre with the main Thames Tideway Tunnel located below the river Thames.
Barhale’s Tunnelling Operations Manager, Frank Green explained that the project required considerable innovation.
“We encountered some difficult conditions in the early stages of the pipe jack which damaged some of the reinforced concrete jacking pipes as they were jacked in behind an open backhoe-type Tunnel Excavator Machine (TEM),” he said.
“With the support of the project team, we developed an innovative solution to help us quickly identify and replace any cracked pipes. It saw us design a bespoke recovery shield which we were able to manufacture in house through our fabrication arm BCS.
“The recovery shield not only enabled the damaged tunnel to be replaced but also provided access to the TEM face to enable repairs and enhancements to be conducted. Additionally, the purpose made TEM was designed to allow complete dismantling at the end of the blind tunnel drive to allow the final connection to the main tunnel to be completed.”
Peter Leyton, construction director for the joint venture, praised the Barhale team for its hard work and effort in getting the TEM to the main tunnel connection.
“The resolution in the team, to come from where we were earlier in the year and then work through all the issues that were put in the way, is a huge testament,” he said. “Also, the control of the movement in the main tunnel has been excellent and a great reflection on the efforts put in all of the team.”
Innovation is one of the key themes which will be explored at Utility Week Live, running online from November 24-26.
To find out more and register for your FREE pass visit: www.utilityweeklive.co.uk/UWLO
- UKWIR launches 2021 research programme UKWIR has kicked off the next round of its research programme that will deliver 12 new projects that will help the water... Read More >
- Anglian Water announces latest apprenticeship recruitment drive Anglian Water is launching 38 new apprenticeship positions encouraging people to consider working within the utilities... Read More >
- Anglian Water reveals new Alliance partners Anglian Water has announced who will form its new Strategic Pipeline Alliance, following a competitive procurement... Read More >
- How to achieve improved reliability of service Richard Broome, managing director and founder of LSBUD, talks about why a consistent service is key to customer... Read More >
- Expansion of SuDS schemes will help alleviate flooding events David Smoker, chair of BPF Pipes Group, talks about how the expansion of the UK government's SuDS scheme should help solve Read More >
- How to bake a connected water network Rik Gunderson, utility client director at Software AG, tells us how to "bake" a smart water network. Read More >
- Techniques to Inform and improve aeration system design and operation Rowland Minall, Operations Director, Aqua Enviro explains the techniques available to inform and improve aeration system... Read More >
- Reaching net carbon zero In summer 2019, the water industry committed to reach net carbon zero by 2030. This is a very ambitious aim and... Read More >