Oct 17, 2016

The 73-mile-long Elan Valley Aqueduct crosses Wales and the English Midlands carrying drinking water to Birmingham, the second largest city in the UK. Originally opened in 1906, a project is currently underway to replace dilapidated sections. Over the next five years, Severn Trent Water will spend £255m improving Birmingham’s water supplies from Wales. ByrneLooby prepared a design to facilitate the excavation of a TBM launch shaft immediately adjacent to the aqueduct.

The project was challenging as it required a deep excavation around the 110-year-old aqueduct. To ensure the existing structure remained unaffected by the excavation, strict movement limits were imposed. A further constraint was that the historic structure needed to remain live for the duration of the project. A combination of bored piling and sheet piling were employed as the optimum solution for this project.

ByrneLooby provided an alternative design solution to facilitate the launch of the tunnel boring machine (TBM) through the secant wall, replacing the need for GFRP or extensive propping with an un-reinforced concrete arch constructed using piling techniques. This allowed for faster and more cost effective construction techniques.

Watch more about this development through the below BBC News Report Link: