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Castlerea Sewerage Scheme
Project Profile
CASTLEREA SEWERAGE SCHEME CONTRACT NO. 3 - MAIN DRAINAGE & WWTP
| Value: | €9,470,000 |
| Client: | Roscommon County Council, Courthouse, Roscommon. |
| Consultant: | TOBIN Consulting Engineers, Fairgreen House, Fairgreen Road, Galway |
| Completion Date: | May 2005 |
| Involvement: | Main Contractor / PSCS, 100% participation |
Project Description:
Scope of the Works included:
- Pipelaying: 225mm & 450mm diameter Foul Sewer 225mm, 300mm, 375mm, 400mm and 450mm diameter Surface Water 100mm & 150mm diameter HPPE Rising main 1,200m of 150mm diameter HPPE water distribution
- 2No. foul sewer crossings under the existing railway line
- 5No. Pumping Stations
- Demolition of the existing town Sewerage Treatment Works. Construction of new Treatment Works.
- Urban Road Reconstruction
- Traffic Management
Particular challenges on this Scheme were:
600m of the 450mm diameter foul sewer involved laying across a section of bog land, 300m of which had to be piled. The other 300m was at 3-4m deep and was at rock / solid formation that didn’t require piling.
The piled section was constructed in the following sequence:
33 tonne piling machine brought in on special fabricated floatation mats,
2No. piles, driven 1.5m apart at 10m intervals,
When all the piles were driven, 4No. wide-track machines were used to excavate the line of the pipeline 4No. welders then constructed the support arrangement between the piles to carry the new 450mm pipework and manholes
Pipework was then laid and the whole area backfilled and reinstated.