Abstract
The A1 in Berwickshire was realigned to bypass the village of Cockburnspath and to remove loading from two 60-year-old reinforced concrete bridges. This realignment required the construction of three major new structures. The smallest was a reinforced concrete bridge over British Rail's East Coast Main Line and the others were two-span composite steel plate girder bridges supported on finger piers approximately 20 m above small burns in deep gorges. Each bridge has a ruling gradient of approximately 2.5% downhill from the south abutment. An innovative system was adopted to launch the bridges down a slope which varied at different stages up to a maximum of 9%. The small plan area available on top of the piers meant that the jacks required during the operation had to fit within the Storey heavy rockers used for the launch. The north girder section was dmitted from the launch and subsequently welded in situ. The paper explains why this approach was adopted and describes the problems encountered and overcome on site.
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