Hydraulic and earth engineering – Miscellaneous
Patent
1990-01-03
1991-03-26
Corbin, David H.
Hydraulic and earth engineering
Miscellaneous
405133, 405268, E02D 2912
Patent
active
050024388
ABSTRACT:
A method for lining or relining a sewer manhole, apparatus comprising an improved leak resistant manhole, and a cementitious mixture for lining/relining manholes. A homogeneous, monolithic, cementitious liner is spray applied in place within a concrete or brick-and-mortar manhole infrastructure without forms, webbing, or re-bar. A manhole to be serviced is first located and spray cleaned with water. Loose concrete and mortar fragments of the original structure are forcibly removed. A cementitious mixture is spray-applied to the interior surfaces of the manhole to create a continuous, monolithic interior liner. This lining is configured substantially identically to the internal shape and geometry of the manhole. When the liner sets after installation, a substantially impervious water and chemical resistant barrier prevents manhole ingress/egress by ground water. The preferred cementitious mixture is a lightweight, high silicate, fiber-reinforced blend, which, when mixed with 20% to 40% water by weight and properly spray applied, will produce a monolithic liner having hitherto undiscovered geometric and structural strength characteristics, including improved water impermeability and chemically resistant properties. The disclosed structure and process contribute positively to the promotion of improved sewer system integrity.
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Carver Stephen D.
Corbin David H.
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