This 300m long underpass structure carries the Lehaunstown Road over the Luas line at Cherrywood, Co. Dublin.

The structure utilises a double “T” precast walling system built on a spread foundation and an integral bridge deck with precast concrete bridge beams and track slab.  The precast wall system, erected in vertical panels, allowed for high efficiencies in speed of construction and repeatability to be achieved.

The double “T” precast concrete wall system utilises a circa 160mm front flange with 800 – 1,200mm deep ribs. This structurally provides a highly efficient solution, minimising concrete volumes and hence reducing substantially the carbon footprint for this large structure.

An in-situ concrete bank seat is located at the top of the precast wall system to allow transfer of moment forces between deck and wall, hence ensuring full integration and avoiding the need for any joints.