Footbridge in Dublin



Footbridge in Dublin
International competition 2002
Award: satisfaction found in project development

One of ideas underlying the footbridge design was to create a recognisable landmark. Use of light effects of lighting beams that cross at the elevation of 60 m, generated by the searchlights located on the top of the steel portal frames, creates at night an image of a “gate” visible within a radius of some ten kilometres.
Another light effect generated by continuous LED lighting built in the railing that uniformly lights the bridge walking surface and creates an atmosphere similar to that experienced on a ship. The third light effect is continuous green fluorescent light installed on the lower edges of the walking surface. The light is intensified in the lifting section, thus highlighting the navigation passage for small pleasure boats. At night, the lighting may change colour of the bridge.

The steel bridge itself is five meters wide and suspended from two steel pylons founded in the riverbed, inclined towards each other, and anchored in the revetment.
The bridge is designed symmetrically to the centreline of a 100.00 m wide river, and lifting of the central section opens a 33.00 m wide passage for all sorts of vehicles.
Towards the river centre, the inclined steel pylons are tensioned in reinforced concrete foundations and each is anchored in the revetment with two tension cables.
The cables lifting the lifting sections with windlass are also fixed in these anchorages.
The bridge structure is a 0.70 m high steel box connected by a cross girder with the pylon and fixed in the revetment wall. The box side walls are inclined in order to dim reflex from the ship radar equipment.
The hinge hydraulics provides for stabilisation of the lifted bridge sections and during initial movement at lowering.
The cables are overrated (doubled) for optical reasons, which enables their replacement at full bridge loading.