Overview
The project involved repairs to the B429 Sheep Bridge in Cherrington, Telford – a single span masonry arch bridge over the River Meese with two flood relief tunnels. The existing scour protection was being undercut, with evidence that water was travelling beneath parts of the structure, threatening the bridge’s stability and longevity.
The scope included stabilising and strengthening the arch support to repair undercutting, installation of scour protection works, removal of existing defective concrete aprons, and replacement with mass concrete alongside and underneath the abutments of the central arch. Isolated spalled and missing stonework in the central arch and flood relief arches were also replaced.
This 7-week NEC 4 Sub-Contract Framework project was delivered on time for Balfour Beatty, with the initial 6-week scheme being extended by one week due to additional required work. The project was completed with zero defects.
Challenges
The Sheep Bridge repair project presented several significant challenges that required careful planning and management.
- Working in a live river environment: The team had to develop solutions for working in unstable riverbed conditions while managing water flow. The Porter Dam required twice-daily checks to prevent failures caused by river force, which on one occasion tore a large hole requiring immediate repair.
- Environmental constraints: Strict environmental controls were necessary to protect the river ecosystem, particularly fish populations and to prevent the spread of invasive species. Work needed to be completed before the fish spawning season beginning 1st October.
- Communication difficulties: The remote location had no mobile phone signal, requiring all communication to be managed via email, complicating coordination and emergency response protocols.
- Load-bearing considerations: The use of a nine-ton excavator on a bridge with a posted 3-ton limit required advance structural surveys and careful management of load distribution.
- Access limitations: The confined spaces beneath the bridge limited access for concrete pumping equipment, requiring alternative material handling solutions.
- Weather and river conditions: Fluctuating river levels and potential adverse weather presented ongoing risks to the works and dewatering operations.
Our approach
A tailored approach was developed to address the unique challenges presented by the Sheep Bridge environment. Key elements of the execution included:
- Comprehensive environmental management: Recognising the critical importance of protecting the river ecosystem, the team implemented a fishery permit process with careful removal and relocation of fish using electric stunning techniques. All fish were safely scooped out before work began in the river. The team also rigorously monitored and removed invasive American crayfish, which carry a disease harmful to native species, and implemented daily decontamination protocols to prevent cross-site contamination.
- Phased construction methodology: To maintain structural stability throughout the works, the team implemented a carefully sequenced construction approach. This involved dividing the bridge into four quadrants that could be completed sequentially while maintaining the integrity of the structure.
- Controlled water management: The Porter Dam installation with 4 tons of sandbags allowed the team to pump out water daily, with twice-daily checks to prevent failures. When river force once tore a large hole, the team made immediate repairs at no extra cost to maintain project continuity.
- Specialised material application: The use of high-strength concrete, allowing walk-on strength within two hours, was crucial for the tight schedule and challenging river environment. The concrete mix was specifically selected for its performance characteristics in the damp conditions.
- Adaptable communication protocols: Despite the lack of phone signal, the team implemented a system of daily morning briefings to review tasks, risks, and safety. This enhanced team focus and reduced the potential for accidents, while ensuring all team members were aligned with daily objectives.
- Collaborative stakeholder engagement: Close collaboration with Balfour Beatty and local suppliers such as SMC Concrete ensured timely concrete delivery and quality control despite communication challenges.
Outcomes
The Sheep Bridge repair project was completed successfully, achieving its primary objectives. Key outcomes included:
- On-time completion: Despite the extension of the initial programme from 6 to 7 weeks due to additional works, the project was completed by the contracted date of 6th October 2025.
- Zero defects: The project was delivered with no quality issues or defects, demonstrating the effectiveness of the construction methodology and quality control processes.
- Structural integrity restored: The bridge’s undercutting issues were fully addressed, with new scour protection properly installed to prevent future water infiltration beneath the structure.
- Environmental compliance: All works were completed in accordance with environmental permits and requirements, protecting the river ecosystem and preventing the spread of invasive species.
- Stonework preservation: Historical aspects of the bridge were maintained through careful replacement of isolated spalled and missing stonework, balancing modern structural requirements with heritage preservation.
- Site safety maintained: Despite the challenging river environment and heavy machinery requirements, the project was completed with no safety incidents.
Conclusion
The Sheep Bridge repair project demonstrates the effective management of complex civil engineering works in environmentally sensitive settings. Through meticulous planning, adaptable work methods, and strict adherence to environmental protocols, the team successfully restored the structural integrity of this important bridge while protecting the surrounding ecosystem.
The project showcases how careful sequencing of works and daily management of site conditions can overcome significant technical challenges. The successful delivery within the tight timeframe and with zero defects highlights the importance of experienced site leadership, clear communication protocols, and collaborative stakeholder engagement, even in locations with communication limitations.
Client Testimonial
“It was a privilege having McPhillips work for us on the Sheep bridge project. There was constant collaboration throughout the project with all parties, completing the works on time and on budget while ensuring the correct EA procedures were being followed and bespoke permits in place. The work was completed to a very high standard and signed off snag free before leaving site. Both Balfour Beatty Living Places and Telford & Wrekin Council were very pleased with the proactive, professional approach of the site team and the quality of the workmanship.”
Simon Middleton – Schemes manager (Balfour Beatty Living Places)