A1 Haddington To Dunbar Expressway, East Lothian
About the Project
- Principal designer: Scott Wilson Scotland
- Client: Scottish Executive
- Principal contractor: Balfour Beatty Civil Engineering
- Principal engineer: Carl Bro Group
- Contract value: £35 million
This was a technically demanding project comprising the design and construction of 13.7km of dual, two-lane carriageways, together with 12 principle structures and 6.5km of side roads. It was to run between the existing A1 Abbotsview Interchange, north east of Haddington, and the new Thistly Cross Roundabout to the south west of Dunbar.
Notable design features included false cuttings to cut visual and noise intrusion, the use of an earthworks bund alongside the railway line and the maximisation of the reuse of rock in the works.
But the most significant element is the bold new River Tyne Bridge , near
East Linton. This three-span bridge on splayed leg piers is one of the largest
and most complex structures built in Scotland in recent years. At 220m long
and some 25m above the river, this reinforced concrete, voided deck, post-tensioned
structure on a curved alignment presented the design and construct team with
a major challenge, requiring the largest and most complex scaffold structure
used in Scotland to date with over 250,000 separate components.
The Judges said:
"A technically demanding project, which demonstrates how an integrated team can complete sensitive projects on time and budget."