James Fisher Testing Services holds a wealth of experience in managing hidden defects in bridge sub-structures. 

Our applications can be used on a range of structural types and can help to extend the operational lifespan of a bridge while improving safety and informing ongoing maintenance strategies. 

Find out more in the two mini case studies below, or contact us for bespoke advice. 


Weetwood Bridge

Hidden  defect: Settlement

Problem: Weetwood Bridge was suffering from leaning side walls.

Solution: The method to halt and arrest the movement involved excavation of fill from between walls and above the arch barrels; this was replaced with polystyrene fill and transverse ties were fitted. James Fisher Testing Services provided a movement and settlement monitoring system to measure any heave resulting from the removal of significant dead load.

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Hedgeley Bridge

Hidden defect: Scour

Problem: The bridge is located across an upland river which is subject to flash flooding and fast flowing water. Scour of the bridge foundations was a concern.

Solution: The risk of scour undermining the foundations had been mitigated by the construction of a concrete apron to channel the water away from the structure. However, this was being undermined by scouring action, indicating that there remained a risk of bridge foundation scour occurring. Sensors were installed in conjunction with a solar powered data logger to monitor inclination of the concrete apron and to provide a real time alert of possible scouring.

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