N5 Scramoge to Cloonmore Co. Roscommon

Project Bridge over live rail line
Client Roscommon County Council
Stage Complete
Description Design and construction of bridge over live rail line.

Fact File

Structure Matière Opti Cadre 5.5m X 4.0m
Span 5.5m (internal)
Height 4.0m (internal)
Length 20m (8 no. Units @ 2.5m wide)


  • Bridge over live rail line
  • Two-way road to run over bridge
  • Minimum impact on rail line.


  • ABM designed a 5.5m span Matière Opti Cadre to span to rail line.
  • Specially devised construction methodology allowed the rail to remain open during construction
  • Using in-situ heels allowed the tracks to remain completely undisturbed during installation
  • Wing walls were used to achieve soil gradient above the structure

The Matiére system was originally developed in France for hydraulic structures in the 1980's, since then the system has been developed into a modular range of arch, box and portal frames for a wide range of transport and infrastucture applications. Indeed, some 10,000 structures already exsist worldwide exploiting soil structure interaction to minimise section sizes and allow rapid, cost effective on-site installation with precast units.

ABM hold the licence for the Matiére system in the UK and Ireland.

Click here to view a YouTube video of how ABM construct a bridge in 3 days


Key Personnel

Main Board Directors
Pat O'Neill
Sean Minihane
Brendan O'Neill


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