A-frame rocker bearing replacement at Humber Bridge, UK

Abstract

Routine inspections of the A-frame bearing rockers on the Humber Bridge, UK, led to concerns over lack of articulation and potential premature wear. Following design optioneering, an innovative scheme was selected to replace the main span’s A-frames with a pair of vertically orientated pendels and a wind shoe at each tower, thus separating out the horizontal and vertical forces, with benefits for construction and maintenance. This paper describes the design and £4 million, 2 year replacement project. The works were carried out in a very confined environment, and required significant strengthening to the existing bridge to accommodate the new permanent and temporary design elements. The project was completed in 2015, all under live traffic, and has ensured the future integrity of this world-class structure.