Advanced spherical roller bearings developed and manufactured by SKF are playing a vital role in supporting a 40-tonne, 30m opening deck on the Pont Y Werin bridge in South Wales.

The bearing units form part of a powerful hydraulic system that is capable of lifting the bridge deck safely and efficiently in two minutes to a vertical position of 75º, while withstanding wind speeds of up to 25m/sec.

The design and construction contract, awarded to civil-engineering group Dean and Dyball Civil Engineering, was for a 130m bridge, comprising four equal sections — one of which is a lifting span that maintains a clear 20m navigational channel below and opens to 15º from the vertical position.

The SKF bearings used for the Pont Y Werin Bridge were of CC design type, with symmetrical rollers, two window-type steel cages and an inner ring centred via a floating ring between the two rows of rollers.

Key features
Withstands the effects of wind forces
Resist extremes of temperature and the effects of both rain and salt water
Designed to provide extremely high load-carrying capacities
Claimed to be easy to fit and inspect
Requires little or no maintenance
Efficient contact seals on both sides of each bearing unit retain the grease inside, while excluding moisture and other contaminants

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