Remedial work for British Waterways on a 200-year-old lock in North Lincolnshire required an internal propping system supplied by Groundforce.
The system provided access for subcontractor Construction and Marine at the site in Keadby, on the Stainforth and Keadby Canal.
The historic site is scheduled as an ancient monument. GallifordTry is the main contractor for the scheme which is being carried out to halt signs of movement in the lock.
An external piled structure was built to relieve the load on the lock walls, which will be anchored back to this structure to prevent further movement and separation. The final stage of the works involves grouting any voids.
Soft surrounding ground and high external groundwater level resulted in very high supporting frame loads.
Groundforce engineers calculated the lower frame loaded needed to provide a capacity of at least 280kN/m.