Winner of the ACEI 'President’s Award for Excellence' in 2003 and the ICS 'Infrastructural Category Award' in 2002.
Tony Dempsey

Tony Dempsey

Director
Client
Railway Procurement Agency
Location
Dublin
Value
approx. €11.0m
Market

Summary

Roughan & O’Donovan provided full engineering design services for this 162m long cable-stayed bridge carrying the LUAS Green Line over the busy Taney Road junction in Dundrum in South Dublin.

Solution

This asymetrical cable-stayed bridge was designed with spans of 21.5, 108.5, 18.0 and 14.0m and a slim, elegantly curved, prestressed concrete deck only 1.325m deep.

The deck was constructed using precast match-cast concrete outer shell segments glued and stressed together, then filled with in-situ concrete, before a further prestress was applied using grouted internal strand tendons.

The deck is supported from a 50 m high in-situ reinforced concrete pylon by 13 pairs of high tensile steel cables consisting of between 16 and 37 Nos. of 15.7 mm diameter 7-wire strands.

  • €11m

    Total cost of the bridge
  • 2004

    Year the first Luas trams crossed
  • 108m

    Main span of the bridge

Challenge

Limiting disturbance to traffic flow during construction was a key challenge.  It was overcome through the use of a single pylon located some distance back from the junction.

Careful positioning of the foundations for the approach spans, and its effect on the design of the superstructure, avoided the relocation of a range of services including water, gas and electricity, located under the road intersection.

Services provided:

  • Feasibility studies
  • Preliminary design
  • Detailed design
  • Construction supervision