Neath Abbey

Site Location:
>> Neath Abbey
Client:
>> Welsh Water
Contract Value:
>> £4,100,000
Project Duration:
>> 52 weeks



Phase One tackled storage overflow in storm situations from a CSO system, into the Ridgisewer, then into a rectangular storage tank, and pumped into the first circular shaft through a screen filter. The lift pumps are capable of pumping 600 Lts per second.


Tunnelling under the canal from Tank One


Overflow tank piled and ready for concrete lining


In addition, the inlet pipeline extension, collecting a currently off site CSO, included the installation of 700m of 600mm dia. gravity pipeline and numerous rising main/CSO installations to connect the Phase 2 works to both the Phase 1 and existing works. The scheme value was in the region of £4.1million and works extended to March ’05.


Tunnelling:
The length of the tunnel is 60 meters and 1200 diameter pipe was used. The dig was carried out using a tunnel-boring machine and driven under the existing Tenent Canal that supplies water for British Petroleum (10million gallons a day). It was vitally important the supply was not interrupted by damage to the canal bed.



A height restriction determined by a railway bridge dictated the design of the sewer line, so limiting the size of plant capable of working under the bridge. Particular care was taken not to cause any structural damage to the bridge.



Excavating and Piledriving opposite the Abby necessitated an archaeologist to be present at all times, to ensure nothing was unduly disturbed and to investigate any items or artefacts that may have been unearthed.



 

 
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