N7 Nenagh to Limerick High Quality Dual Carriageway
FKL carried out this contract in support of 35km of high quality dual carriageway running from Nenagh in Co. Tipperary to Limerick in Co. Limerick (the existing N7). Over 8000 piles were installed over 3 phases as follows:
- Annaholty Bog Ph 1 – 3849no 270mm2 piles length 24 to 32 metres
- Drominboy Bog – 3486no 355mm2 piles length 10 to 22 metres
- Annaholty Bog ph 2 – 524no 355mm2 piles length 24 metres
With a view to project efficiency we cast 80 piles a day (between 4000-4800 metres per week – 120,000 metres in total) at a dedicated casting yard which we set up on site. Junttan rigs were deployed to each install up to 600metres of piling per day, with pile depths of up to 32 metres.
Piles are supporting an earth embankment through a peat bog, with piles loads ranging from 49 to 80 tonnes. The “load transfer platform” (LTP) is a geotextile layer spanning between the pile caps supporting the embankment which varies from 3m to 8m high.
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