Definition - What does Monolithic Structure mean?
A monolithic structure, in the context of sewer rehabilitation, is a manhole structure built as a single watertight unit. The component is made such that the end product has no seams or joints that could cause leaks or degradation. Manholes are an integral part of the sanitary sewer system and should be of good quality without defects that could cause inflow/infiltration problems or tree root intrusion.
Trenchlesspedia explains Monolithic Structure
Traditional concrete manholes are manufactured and installed as segments that require watertight sealing materials to be applied to the base and as each segment is consecutively placed. There is a chance for seal failure, as the procedure takes time and human error is possible. Since manhole environments are corrosive in nature, there are high chances for manhole failure by seepage through joints. Monolithic manholes are made from concrete and fiberglass in factories where a single watertight unit can be manufactured. These structures are light and require fewer personnel to install, reducing the overall cost of rehabilitation.