Tony Dempsey

Tony Dempsey

Director
Client
SIAC-Ferrovial Joint Venture
Location
Co. Meath
Value
€33.8m
Market

Summary

Roughan & O’Donovan developed the alternative conceptual design for this 115m long, 3 span, fully integral bridge, crossing the River Boyne and forming part of the M3 motorway in Co. Meath.

Solution

The bridge consists of a central span of 51.5m and two side spans of 30.8m each.  It features haunched steel beams; a curved arch profile; masonry clad reinforced concrete abutments; and intermediate piers.

A bespoke parapet reflects the masonry parapet on Ballinter bridge, a neighbouring multi-span 18th century masonry arch.

Challenge

Designing a bridge over the environmentally sensitive River Boyne, without impacting the river, its banks or the delicate wildlife habitat below, represented a challenge.

The bridge’s central span of 51.5m eliminated the need for supports in the river, thus protecting it and the island from environmental impact.

Services provided:

  • Bridge engineering design
  • Environmental engineering design