Permeation grouting, void filling and lifting at a wastewater treatment plant

The Quakers Hill Wastewater Treatment Plant in Sydney, Australia, has a pump pit that houses several pumps that transfer water from the digesters to other tanks. The pit is sloped and has a sump pump so that rainwater doesn’t collect in the pit. The other corner at the same end of the pit as the sump had settled, however, causing water to pool in that corner rather than flow to the sump pump. Analysis showed that the substrate beneath the pit was weak and several voids were present. Read the full case study here.

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