Two new build waste effluent sumps required a lining to be installed. The original specification was for an epoxy coating. However, after carrying out a confined space survey it was apparent that the concrete rings utilised were substandard. Therefore an epoxy lining was not suitable for this, instead an effluent sump GRP lining was utilised.
Preparation for Effluent Sump GRP lining application
Initially the entire concrete surface was sept blasted to remove laitance and create an etch for a lining to adhere to. After blasting it was apparent the sumps have water ingress issues. Therefore the worst task we had was stopping the leaks to get the sumps dry for lining application. Using Sika water stop, the leaks on the wall we repaired leaving the floor for the time being.
2 x layers of 600gram chopped strand matting and a surface veil embedded in Vinyl Ester resin were applied to the walls. An indirect fired heater was used to fast cure the walls. Consequently as we had caused the water to bypass the walls the ingress was now coming up through the floor. Water plug products were not working due to the detachment of the slab to the bottom ring. Now we had the walls done and cured we had a great biting point to latch onto.
As the floor had a constant flow of water we slowed the pressure down. As a result this left 1 small leak coming through the floor. The base was then filled with pea shingle. Using pre-cut ½ inch GRP sheets we made a false floor which was subsequently seamed and latched onto the walls. Thus stopping the water coming through and causing it to find a new route away from the sumps. By the time our site team had finished there were 2 x self-supporting sumps ready for a long service free life cycle.
For more information on GRP linings please contact us.