This scheme used a variety of our service offerings including Hot Cure CIPP lining, CIPP patch repair, Minor Civils works and spray lining, all delivered on programme by our directly employed staff.
First, we were required to reline 158m of 150mm diameter vitrified clay foul sewer. The relining technique consisted of trenchless, cured-in-place lining using the hot water cure method. A pre-liner was installed prior to the CIPP liner to help to contain styrene gas. Following installation of the lining works, the styrene water was removed from site using a tanker to negate any environmental impact that may arise from this.
During our lining works a further defect was identified, a hole in the roof of a 150mm diameter sewer immediately upstream of one of the manholes to be spray lined. Our operatives reacted on site and installed a 0.5m patch repair.
Following our lining works we were to utilise our innovative M-coating Spray Lining System to spray seal three manholes to protect them from H2S corrosion, stop infiltration and increase its lifespan by a further 30+ years. One of the manholes was buried and required minor civils works to be uncovered so this could be accessed to be sealed. Then, all three manholes were completely sealed within 1.5 days on site with minimal requirements for man entry and minimal disruption to the surrounding areas when compared to traditional excavation and replace techniques.
Flows were managed using a combination of tankering and storage within the network meaning that no over pumping had to be used, reducing site footprint and cost to the client.