James Fisher Strainstall 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.
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. JF Strainstall provided a movement and settlement monitoring system to measure any heave resulting from the removal of significant dead load.
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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