Rotating a bridge a swing bridge rotates horizontally about a vertical axis.

Samuel beckett bridge rotation background. The bridge which rotates through 90 degrees is asymmetric reflecting a harp laid on its side with the base to the cable stayed steel pylon set outside of the river s navigational channel 28m from the river s south quay wall. The bridge is then in equilibrium. In order for the bridge to rotate 90 its center of gravity without live load has to be centered within the main support pier. Image of destination district centre 16531772 the samuel beckett bridge editorial photography.

The bridge is a cable stayed steel box girder structure with a 120m span across the river liffey. The shorter end of the samuel beckett bridge has almost 2500 tonnes of steel lead and heavy concrete added to it so that the centre of gravity of the whole structure is directly above the pivot. The multimodal platform that can rotate 90 degrees by a rotation mechanism located at the base of the tower to allow river traffic including four lanes for cars two in each direction of travel two lanes for pedestrians and cyclists and a space for future tram. The pylon curves northwards to a point 48m above the water level with 25 cables set in a harp formation.

There is a central steel pipe that is raised 75 mm off the main rim support by 5 hydraulic jacks and then rotated by 2 large hydraulic rams working as a push pull system. Samuel beckett bridge d glide main rotation bearings 124 metres long 27 metres wide.

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