M25 Gade Valley Viaduct Repairs


Highways & Railways


M25, London


National Highways

The Gade Valley Viaduct, by Junction 20 of the M25, carries the motorway over the grand union canal, the river Gade, a major road, and the main London-Birmingham railway. This is an important structure that is critical to the UK’s economy.


Working with National Highways, Connect Plus, and OsborneBuilding Steel Solutions assisted in the process of carrying out structural steel repair with strengthening the welds on the underside of the M25 Gade Valley viaduct spans to ensure the safety and stability of the structure after a shortfall in fatigue life had been identified.


This has been our longest continuous project, and our dedicated team have been working hard on this challenging project for some time.


After a thorough assessment to the viaduct, we determined that it was necessary to install strengthening plates fitted over existing butt welds under one span of the viaduct. Under this one span alone, there is a total of 43 stiffener locations, with 300 plates and 9000 TCB bolts.