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During the bending the sections were heated to a digitally controlled temperature of 1040ºC. The section was allowed to cool naturally to ensure the properties of the section were retained. It is normal to quench pipe during induction bending but due to the thickness this was not necessary. The finished pipe retained the exact diameter measurements as the straight pipe.

Specialist bridge engineers Fairfield-Mabey controlled the sub-contract process from project management to quality issues to ensure the job was the best that could be produced.

The huge arches were curved to within 10mm over the length of the bar, which is tighter than NSSS tolerances require. The total curved tonnage was 130 tonne.

Due to the angle that the bridge crosses the water, the east and west arches are both different in radius and length. The east arch inside radius is 46.389m and the tube is 54.5m long.

The west arch inside radius is 48.559m and is 55.5 metres long.

Barnshaws Steel Bending have the largest induction bending capacity in the UK. They can do single bends, bend and straight combinations and multi directional bend configurations of tube up to 1067mm in diameter.

This will be increasing in the near future to 1524mm in diameter and Barnshaws Steel Bending will then have the largest bending capacity in the world.

www.barnshaws.com