New Road Bridge over Rail
Lime Kiln Bridge is a highway bridge in Newport, South Wales with two spans of 27.5m and 23.4m.
The original life expired structure was replaced using a traditional concrete/ steel composite bridge with 6 plate girders supporting permanent GRP formwork to construct the insitu concrete deck.
The new bridge deck was constructed on the existing substructure using new precast concrete cill units to provide the clearance up lift required.
These cill unit depths were kept as low as possible by using an aesthetically pleasing longitudinal camber in the steel beams to ensure minimal changes in the road approaches while adding significantly to the track clearance achieved.
The bridge was design with a 3.0m wide combined cycleway carrying existing services alongside a 7.3m carriageway width with steel H4A parapets both sides.
New lighting was designed and added to the structure.
A complication in the scheme was that the existing bridge carried a large diameter gas main, telecoms and electrical supplies as well as a national cycle route. As the structure crosses the main South Wales mainline, Crouch Waterfall designed a temporary combined services/cycle bridge to allow the work to be undertaken in a staged programme while maintaining the cycle route and keeping the services safely away from the main construction.