Morris Homes plc
Locaton: Chorley, Lancashire
Technique: Guided Augerboring
Main Contractor: Morris Homes plc
Sub-Contractor: Perco Engineering Services Limited
The developers discovered a problem with build ups of methane gas during the construction of a prestige development of 3 bedroomed townhouses and 4 bedroomed detached houses in Chorley, Lancashire.
The gas seemed to be rising from the strata below a recently completed house. If a means of dispersing the gas couldn’t be found, then the house would have to be demolished, representing a large financial loss to the developers. Morris Homes approached Perco to help provide a solution to the problem.
Perco was chosen because of its innovative approach to solving groundworks problems using Trenchless Technology. After discussion it was apparent that a venting system was required to remove the build of gas from below the floor slab and discharge it harmlessly into the atmosphere.
Perco’s solution was to install a total of 11 perforated pipes beneath the floor slab. The new pipes were installed using a small auger rig, which limited the amount excavation to be undertaken. Entry and exit holes were broken into the concrete block foundations. The augering operation took place in the spoil backfilled area beneath the floor slab.
The size and nature of Perco’s equipment meant that minimal preparation works were required. As works proceeded, the special SnapIt™ perforated polyethylene pipes were installed. SnapIt™ is a patented short-sectioned pipe system designed and manufactured by Perco for pipeline renovation and trenchless installations.
On completion of the works the excavation, which ran along one side of the house, was backfilled with single sized stone to allow the methane to vent away
The existing 25” cast iron rising main carries sew...
Perco - Specialists In Trenchless Technology
