Bobbin Head Bridge Rehabilitation

The Bobbin Head Road Bridge (B476), originally built in 1956, spans 58.5m with three 19.5m prestressed concrete girders. A structural inspection in May 2020 revealed significant deterioration, particularly in the pier headstocks within the tidal zone, where reinforcement corrosion, concrete spalling, and bearing assembly degradation were observed.

Freyssinet was first engaged in 2020 for concrete patch repairs. However, a detailed inspection identified more severe structural issues, leading to a de-rating of the bridge capacity to 16 tonnes GVM and a one-lane traffic restriction. As a result, the initial project scope was revised, leading to a re-tender process. Freyssinet was awarded the second stage of the project in August 2022 to undertake comprehensive rehabilitation works.