SEAN O’CASEY BRIDGE – LIFFEY PEDESTRIAN BRIDGE
This pedestrian bridge spans the River Liffey between City Quay and Custom House Quay. It is a bi-parting, four span, cantilevered pedestrian steel bridge, which pivots on two intermediate piers constructed in tidal waters.
The overall length of the bridge is approximately 97 metres. The abutments are cantilevered and consist of in-situ concrete foundations bearing on 600mm diameter bored cast in-situ piles. The abutments are cladded with granite panels with a high quality architectural finish. The cantilevered portions of the abutments are supported by tensioned cables connecting them to the concrete foundations.
The bridge piers are elliptical in shape. They are supported on bored cast in–situ piles, socketed 3 metres into rock and were constructed within cofferdams in the river. The piers are clad with granite panels.
The cantilevered cradles comprise a hollow section steel, fabrication with a circular base and four tapering arms to accommodate cable ties saddled over the cradle tops and tensioned down to a central support pivot. The cradle is mechanically fixed to a hydraulically operated central pivot type bridge bearing to accommodate vertical rotation.
The deck structure consists of profiled aluminium planks with a non-slip surface fixed to steel brackets supported by continuous longitudinal steel circular hollow sections.
The piers are protected by a floating fendering system fixed to tubular steel piles driven into the riverbed.
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CLIENT
Dublin Docklands Development Authority
LOCATION
River Liffey, Dublin
VALUE
€7 million
ARCHITECT
Brian O’Halloran Associates
PRINCIPAL ENGINEER
O Connor, Sutton,Cronin
CONTRACT PERIOD
April 2004 – July 2005
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