Method of rehabilitating a manhole
AssigneeHydro-Klean, LLC
InventorsMatthew T. Huston, Michael Ingham
Life of this patent
Estimating the term…
Abstract
The method of repairing a manhole begins with assembling concrete forms above ground to correspond to the shape of the manhole wall. Then, a plastic liner sheet is wrapped around the assembled forms and the seams are welded. The forming sections are then removed, and the liner is placed in the manhole. An annular space exists between the liner and the manhole wall. The forming sections are re-assembled inside the liner. Concrete is then poured into the annular space and allowed to cure. The forming sections are removed, leaving the liner anchored in a new monolithic concrete wall fully engaging the old manhole wall.
Claims20
A method of rehabilitating a manhole having a wall with a lower cylindrical portion, and an upper access opening, comprising:
- determining dimensions of the manhole;
- pre-shaping, outside of the manhole, a liner sheet with outwardly projecting anchors to form a liner body with a first shape corresponding to the manhole dimensions;
- welding outside seams of the liner body;
- collapsing the liner body;
- positioning the collapsed liner body into the manhole;
- expanding the liner body inside the manhole to the first shape so as to create an annular space between the liner body and the manhole wall;
- and then assembling a set of forms inside the liner body;
- then pouring concrete into the annular space so that the projections of the liner are embedded in the concrete;
- allowing the concrete to cure;
- and
- removing the forms from the manhole after the concrete has cured at least partially to leave a new concrete wall sandwiched between the manhole wall and the liner body.
A method of repairing a wall of a cavity below ground level, comprising:
- forming a protective barrier above ground corresponding in shape to the wall to be repaired, and the barrier having interior and exterior sides and outwardly extending projections;
- moving the protective barrier to a position inside the cavity and with an annular space between the wall of the cavity and the barrier;
- then erecting concrete forms inside the cavity adjacent the interior side of the barrier;
- then pouring concrete in the annular space to form a new concrete wall between the barrier and the cavity wall with the projections embedded in the new concrete wall;
- and
- removing the concrete forms from the cavity.
Dependencies are inferred from the claim text.