- 16th February 2018
- Posted by: Joanne Woodhouse
- Category: Projects
Rodley bridge is a 38m long Pratt truss steel bridge built during the late 19th century which provides access to Rodley Nature Reserve and pumping station. Due to the deteriorated state of the bridge, we were tasked with assessing the structure and designing strengthening and repair works.
The bridge is in constant use providing access to the pumping station therefore planning of the strengthening works was a challenge. In addition, the only existing u-frame connection between the trusses had advanced corrosion, presenting a serious risk of collapse if the structure was overloaded.
To minimise the extent of works above the river and to avoid any impact on the pumping station traffic flow, a truss-type top bracing frame was developed to be built in sub-assemblies. An extensive analysis of the top chords was performed by numerical and analytical methods. The analysis of the top chords helped to optimise the installation process and reduced health and safety risks associated with site works.
Strengthening works were designed to be prefabricated in subassemblies which were easy to transport and install, reducing construction costs and installation time. Where possible, existing elements were used to reduce the amount of strengthening works required to improve the structure.