CLM – Ferry Bridge
Ferry Bridge is an historic suspension bridge in Burton on Trent which was in need of refurbishment work during October 2015.
In order to carry out the repairs to the bridge a scaffolding system was required to be set up to allow access for the contractors. The Scaffold system would rely on the screw piles to act as the full support. The loading on the anchors would be both the weight of the system and also the side loadings from the river current and any debris floating down stream.
We were approached by Staffordshire County Council to supply and install screw piles into the bed of the River Trent to form a stable base for the scaffold system.
A total of 80 - 60R Screw Piles were required to be both made and installed within a 4 week deadline period to ensure the restoration work could begin on time.
The installation process consisted of using both our 400H hand held torque head and our 500X torque head mounted on a 2t excavator which was set on a floating pontoon.
The piles that were relatively easy to access in the shallow waist deep water were installed first using the hand held 400H. These piles could then be used as datum points for the more difficult piles towards the center of the river. These were installed using the excavator on the floating pontoon with our 500X torque head.
The process was slow as only a few piles could be loaded onto the small pontoon at any one time. Numerous trips back to the river bank were required to keep installation going.
The majority of the piles were installed to 3m deep with close watch being made to the installation torques to ensure the pile capacities were reached.
Pile positions and levels were crucial as steel beams needed to be fixed to the pile tops to spread the loads of the scaffolding across groups of piles.
Once each group of piles were installed, flat termination plates were used to form a connection between the pile top and the RSJ beams.
Despite the challenging conditions such as the tide, pontoon etc. the installation was completed in 2 weeks allowing the start of the scaffolding build to begin ahead of schedule.