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Salmon Leap Bridge Refurbishment
Project Profile
Salmon Leap Bridge Refurbishment
| Value: | €1,482,000 |
| Client: | Kildare County Council, Aras Chill Dara, Devoy Park, Naas, Co. Kildare Contact: Mr. George Willoughby Ph.: 045-980200 |
| Consultant: | Michael Punch & Partners, Carnegie House, Library Road, Dun Laoghaire, Co. Dublin Contact: Mr. Martin Heffernan Ph.: 01-2352980 |
| Completion Date: | July 2006 |
| Involvement: | Main Contractor / PSCS, 100% participation |
Project Description:
Works consisted of road widening & bridge reconstruction over a 700m approx. length on the N4 through Leixlip Village.
In detail, the Works consisted of:
- Construction of new footbridge over River Liffey, attached to the existing masonry arch bridge which is a “Listed” structure. Widened footpaths were provided on the approaches, supported by masonry clad RC retaining walls constructed adjacent to the existing masonry. The foundation supports for the new approach works consisted of piling immediately adjacent to the existing masonry structure. Piles were used to strengthen the existing foundations of the masonry bridge and provide support for the new widened structure. This presented particular challenges in relation to vibration and settlement monitoring of the existing ‘listed’ structure.
- Installation of steel ties and rock anchors to strengthen the existing masonry arch structure.
This involved the installation of 65No. Ancon double corrosion restraining anchors, anchored 5m into the side of the bridge and cast into the new extension to provide a nominal restraint force of 30kN/m.
- Demolition of the existing cantilevered footpath, removal of existing surfacing, reinforced concrete repairs and widening of steel footpath over river.
- Entire bridge deck repaired, waterproofed over arch spans and resurfaced. Remainder of masonry structure re-pointed with fresh mortar and any weak or damaged areas repaired or rebuilt.
- All necessary pavement, footpath and utilities construction
- Single lane traffic was maintained at all times and measures were taken to provide suitable pedestrian/cycle traffic access. Work required a number of traffic management phases (eight in all) to facilitate traffic and pedestrian movements on either side of the bridge and at either end.