Manhole rehabilitation system
AssigneeGeneva Pipe and Precast Company
InventorJed Christopher Friesen
Life of this patent
Estimating the term…
Abstract
A manhole rehabilitation system where in one example an existing cross-pipe is exposed and a manhole base and riser are cast around and above the existing cross pipe to form a manhole. In one example an FRP base liner and FRP riser liner are placed before casting in place. In one example casting is made of an aggregate. In one example, a collar and manhole cap rest upon the casting, and are supported thereby such that the liner need not be structural. In one example an existing pipe or manhole forms the outer surface of the casting. In one example shoring is placed and used as the outer surface of the casting.
Claims11
A method for producing a manhole comprising the steps of:
- establishing an excavation below a ground level;
- exposing an external piping in the excavation;
- providing a non-structural base structure in a base region of the excavation, the non-structural base structure having pipe openings;
- removing a section of the external piping;
- placing a channel pipe having opposing ends in the non-structural base structure, and attaching the opposing ends of the channel pipe to the external piping in place of the removed section of external piping, wherein the channel pipe passes through the pipe openings, and wherein the channel pipe has a section thereof removed so as to have an open channel therein forming a fluid conduit to the external piping;
- filling at least a portion of the base region with a semi-fluid aggregate material;
- allowing the aggregate material to harden;
- sealing at least one riser liner to an upper edge of the non-structural base structure;
- and
- sealing a riser cap to an upper edge of the riser liner.
Dependencies are inferred from the claim text.