Retaining Wall, Pontygwaith


This was a very challenging project with high risks due to the close proximity of the Merthyr to Cardiff railway line, a high-pressure water main and 6 BT fibre optics. A large crack had also formed in the carriageway adjacent to the wall, due to slope instability, so it was important that the works were undertaken without delay.


This scheme was delivered under the South East Wales Highways Framework. The scheme consisted of the removal of an existing mass concrete retaining wall on the side of a steep slope and replacement with a contiguous piled wall to support the highway, 4 fibre optic cables and a 610mm water main.

As part of the scheme, we had to establish the exact location of and protect existing services, remove the existing mass concrete wall on the side of the very steep unstable slope, construct a contiguous piled wall, reconstruct the carriageway and footway and install a new parapet.

Traffic management in the form of temporary traffic signals was used to maintain two-way traffic flow throughout. Great care had to be taken during the works to protect the railway track at the bottom of the slope and close liaison with Network Rail and local residents was required throughout.


Despite the challenges, we achieved a successful outcome as confirmed in the client testimonial:

“Credit to ERH for delivering the project to a good standard and in a timely manner despite the technical challenges. Our good working relationship enabled us as the client and ERH as the contractor to work together to utilise value engineering techniques to limit additional costs as a result of the engineering challenges. No issues or complaints were received from the utility companies and ERH were able to limit the level of disruption throughout the project. The project was successful and I look forward to working with ERH again in the future.”

Group Leader Engineering & Traffic


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