18 Jan 2010
We were called in by main contractors Amco to advise on the problem. Open cut wasn’t an option as the line is in regular use meaning that a trenchless solution was essential.
Our engineers surveyed the site and recommended installing a new 225mm ID gravity sewer using guided auger boring and Naylor Denlok clayware, and then stabilising the old culvert with cementitious grout.
After installing the new sewer, a 63mm ID perforated pipe was installed at the roof height of the old culvert which was then used as a grout tube. Cementitious grout was injected into the void to stabilise the ground and fill any voids in the old culvert.
As the site was adjacent to a pig farm, we had to ensure that hygiene on the farm wasn’t compromised, so vehicle washing baths were installed at the entrance to prevent possible contamination of the herd.
The existing 25” cast iron rising main carries sew...
Perco - Specialists In Trenchless Technology
