System and method for extending the height of a manhole
AssigneeHydro-Klean, LLC
InventorsMatt Huston, Chad Hauck
Life of this patent
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Abstract
A trenchless method of installing a new poured-in-place manhole liner provides structural rehabilitation to an existing buried manhole, and is extended above the existing manhole to a higher pre-determined elevation to match the finished grade of a raised levee design. The new liner can be formed in a single or double stage process, which substantially eliminates trenching and excavation of soil, so that new levee soil is not disturbed. The process is faster and less expensive than building a totally new manhole, and maintains the structural integrity of the levee.
Claims20
A method of modifying an existing manhole, wherein a beginning grade is being raised to a new finished grade, and the manhole having a floor, a barrel extending upwardly from the floor to a height below the beginning grade, and a cone on top of the barrel with a cover at the beginning grade, the method comprising:
- removing the cover and the cone;
- pouring a new concrete lower liner inside the barrel;
- pouring a new concrete upper liner on top of the lower concrete liner to a height above the beginning grade;
- installing a new cone and cover on top of the lower concrete liner at a height to match the finishing grade;
- and then
- adding soil to reach the finishing grade.
A trenchless method of installing a new poured-in-place manhole liner to rehabilitate an existing buried manhole and to extend above an existing grade to a higher pre-determined elevation, the method comprising:
- removing soil around a top portion of the existing manhole;
- removing an upper casting on the existing manhole;
- installing forms inside the existing manhole to form a new lower liner;
- installing forms above the existing manhole to form an upper extension above the existing manhole;
- pouring concrete into the forms to create the lower liner and the upper extension;
- installing a new casting on top of the upper extension;
- and adding soil around the upper extension to the pre-determined elevation.
Dependencies are inferred from the claim text.