July 2022 update

Taziker Industrial Ltd. have completed investigation and testing works on Whorlton Suspension Bridge. 

The results of their findings determine that the initial method proposed to separate the main suspension chains for inspection and analysis was unsuccessful due to the significant extent of corrosion to the main chain pins that connect the chain links together.  The site works were therefore put on hold until a new design could be developed to allow the safe and sympathetic removal of main chain pins. 

We have concluded that the main suspension chains can support the anticipated pedestrian and vehicular loading.  Elements of the timber deck and connection details to the hangers still fail assessment for the anticipated loads and our consultant engineers are progressing alternative designs and assessment methods to overcome the few remaining assessment failures.

We are still working to conclude and evaluate the findings obtained over the last 6 months, while continuing to work to develop the refurbishment and where necessary strengthening scheme to allow the bridge to be reopened to both pedestrians and vehicles within the timeframe set by the Levelling Up Funding bid.

Findings

We have found a number of typical defects associated with fatigue and consistent overstressing of individual members. There are also widespread generic defects associated with the age and type of the structure.

Example of a failed hanger connecting bolt

Example of a typical worn hanger connecting bolt

Example of a typical main chain connecting pin

Example of a broken hanger connection plate that forms a main chain link