Case Study: Gade Valley Viaduct
Intake School Footbridge is a 2-span steel deck supported on reinforced concrete piers. Built in the late 1960s, the west span carries a footpath over the A18 (Leger Way) and the east span carries the footpath over a wide grassed verge. It is located approximately 3.5 km east of Doncaster town centre.
The principle inspection revealed a number of defects with the structure. The paint system to all steel surfaces was in a poor condition and required repainting. The half joints on the concrete ramps needed to be cleaned out and resealed with a water resistant expanding joint sealant. The anti-skid surfacing to the steel deck section required replacing.
The eastern joint of the deck plate required grit blasting back to stable material to remove the corrosive area and a steel strip to be welded to the underside to provide extra support.
Following implementation of an approved traffic management system and safe system of work, the scheme included:
All Jack Tighe Ltd operatives received a site induction to ensure safe working practices and site minimum PPE requirements were complied with. Site induction covered all emergency arrangements on site including muster points.
Access to the working area was via MEWPs (power operated mobile work platform) and all operators held in-date certified IPAF papers (3a/3b). The working area for the footbridge was defined by boundary fencing; all MEWP operations remained within this boundary.
Other work included use of electrical power tools, application of paint by brush/roller, surface preparation using hand tools, low pressure jet washing, surface preparation by wet grit blasting and filling blast pots. All operations were included in the risk assessment.
We collaborated closely with an approved traffic management subcontractor, Amco Engineering (who carried out all necessary steel repairs) and our assocated company Jack Tighe Coatings Ltd who carried out some of the painting required at their Kirk Sandall factory.
The number of workers involved in this project peaked at 5 and contract works were completed to programme in October 2018 for a value of £66,000.