An inflow of silt has brought boring to a standstill on the UK’s 3.5km long, 2.85m i.d. Preston storm water improvement tunnel, being constructed for United Utilities. The incident occurred shortly after the launch of the machine at the end of last year.
A spokesperson for United Utilities told Tunnelling Journal, “Construction work on a small section of tunnel near Clifton Marsh has been temporarily halted following silt ingress. The tunnel section affected is on the North side of the River Ribble.
“Construction work in Preston city centre is continuing as normal.
“Investigation work is taking place to determine what engineering steps are required to recommence work on that section of pipe.”
The US$182M project is being built by KMI, a JV of Kier/J Murphy/Interserve Project Services, using a Lovat EPBM.