Method of rehabilitating manholes by custom lining/relining

For manholes having at least a partial brick, tile, concrete block or concrete interior housing of a non-uniform dimension extending vertically between an upper manhole cover and a buried generally horizontally extending sewer pipe or conduit, a method of lining/relining the manholes to rehabilitate and reinforce them, said method comprising the steps of:

• (a) locating a manhole to be lined/relined;
• (b) preparing the interior and interior surfaces of the manhole by cleaning the brick, tile concrete block and mortar or concrete interior thereof and removing loose particles of brick, mortar or the like;
• (c) preparing a monolithic, lightweight, high silicate, fiber-reinforced cementitious hydraulic cement mixture suitable for subsequent spray application;
• (d) spraying said cementitious mixture about the interior surfaces of the manhole to create a continuous monolithic impervious interior liner formed in place at the job site and configured substantially to the internal geometry of the manhole;
• and,
• (e) allowing said liner to set, whereby the flexural strength of said manhole is enhanced.

A restored and structurally reinforced manhole comprising:

• (a) a circumferential shroud formed of brick, tile, concrete block and mortar or other building units, said shroud comprising an interior and adapted to be buried in the ground;
• (b) said interior of said shroud facilitating human access to a buried sewer conduit;
• (c) a sprayed cementitious liner within said manhole upon said interior creating a continuous monolithic interior liner formed in place and custom configured at the job site substantially to the internal geometry of the manhole;
• and,
• whereby the flexural strength of said manhole is enhanced by said liner.