M48 Severn Bridge suspension cable inspections
An essential programme of work on the M48 Severn Bridge to carry out inspections of the suspension cables and tackle corrosion.
The M48 is one of the UK’s only parallel strand bridges, and there are very small spaces between the 5mm wires that form the bridge cable that allowed moisture to enter and cause corrosion. The corrosion was found in 2006 and measures have been undertaken to minimize any further corrosion and monitor the cables.
As part of this, the 511mm diameter main cable cables are opened up and inspected every five years to ensure the levels of corrosion have not increased.
Inspecting several sections of the two main suspension cables as part of routine investigations will ensure the bridge remains safe for years to come.