With a proven track record of delivering complex pipeline and tunnel works, the successful delivery of the project showcases the highest standards in planning, construction, and maintenance, reflecting meticulous attention to detail and commitment to excellence at every stage. The initial design phase involved comprehensive geotechnical surveys to inform proposals and support with risk management.
These advanced assessments helped inform critical decisions through the construction phase, employing cutting-edge tunnelling and innovative engineering solutions, ensuring every aspect was executed with precision and consideration. The maintenance strategies implemented ensured long-term resilience and reliability, adhering to stringent safety protocols and environmental considerations. This approach exceeded industry benchmarks, setting new standards for future projects and lessons learned.
To facilitate the construction of a major transport infrastructure project and ensure a safe and reliable gas supply, Cadent appointed United Infrastructure to deliver a complex gas pipeline diversion at Saltley Viaduct in Birmingham. The project commenced in August 2024 and was completed by March 2025 under the NEC Option A form of contract.
This development required the diversion of an existing 450mm Intermediate pressure gas pipeline to accommodate the new viaduct. The project involved the rerouting of 260 metres of pipeline, including an Under Track Crossing (UTX) beneath existing railway lines.
The project required extensive stakeholder engagement, with a record number of consents obtained for a Cadent project. Despite a stringent timeline, UI delivered the project ahead of schedule and within budget.
After extensive review, UI selected HB Tunnelling (HBT) to deliver the project using a Herrenknecht AVN1200 micro-tunnel boring machine (MTBM), a well-proven and scalable solution.
During the tunnelling phase, the MTBM, named Lorena, successfully completed a 106-metre long, 1.5-metre diameter tunnel, running from East to West beneath the Derby and Washwood Heath rail lines, which served as a conduit for a replacement gas pipeline.
Crucial to the project’s success was the decision to construct shafts using the wet caisson method to mitigate the challenging wet ground conditions between the River Rea and Birmingham and Warwick Canal.
One of the significant challenges was the movement of large-scale plant equipment through a busy industrial area with restricted access points. UI proactively managed the challenges of moving the substantial equipment required and conducted a specialised laser survey to safely transport oversized equipment through narrow and congested routes. Some equipment was disassembled to pass through a tight archway and reassembled on the other side, demonstrating UI’s innovative approach to logistical challenges.
Throughout the project, UI maintained a Zero Harm approach, recording no Health & Safety incidents over 4,000 working hours and safeguarding nearby water bodies, such as the River Rea and the Birmingham and Warwick Canal in an area of difficult ground conditions.
The project delivered outstanding measurable results, demonstrating its success in meeting industry challenges. Innovation and collaboration were at the core of the project.
Testimonials
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This was a challenging project from the start, with significant risks to be assessed and managed within very tight timescales. The successful completion of the project is a fantastic achievement by all involved and was only made possible by all parties working closely together.
Adam Knight, Project Director, Cadent
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