Cast-in-place manhole liner method
AssigneeAction Products Marketing Corporation
InventorCarroll O. Trimble
Life of this patent
Estimating the term…
Abstract
The present method includes casting a poured concrete liner in an existing manhole with a protective acid resistant plastic material covering the interior surface of the newly poured concrete liner. A plurality of arcuate form panels are assembled into a circular form spaced radially inwardly from the existing manhole wall so as to create an annular space therebetween. Plastic sheeting is then fitted around the outside of the form with protrusions extending outwardly from the plastic surface into the annular space. Concrete is poured into the annular space and surrounds the plastic protrusions to bind the plastic sheeting thereto. The forms are removed after curing of the concrete, thereby leaving the plastic liner on the inside wall of the newly poured concrete.
Claims14
A method for casting a generally cylindrical lining wall in an existing manhole having an existing manhole wall of generally cylindrical configuration, said existing wall having a bottom and an annular top edge, said method comprising:
- assembling a plurality of arcuate form panels into a form assembly of multiple layers within said existing manhole, said form assembly having a generally tubular configuration having a radially outwardly presented arcuate surface located in inward radial spaced relation from said existing manhole wall;
- placing a plurality of sheet members of plastic material around said form assembly while said form assembly is within said manhole so as to completely surround said form assembly and so as to snugly embrace and cover said outwardly presented arcuate surface thereof whereby an annular space is left between said sheet members and said existing manhole wall, said sheet members having a plurality of protrusions extending radially outwardly therefrom into said annular space, wherein said assembling and placing steps are sequentially repeated for each layer of the form assembly;
- filling said annular space with concrete so that said protrusions are embedded within said concrete and so that said existing manhole wall is completely covered with said concrete;
- permitting said concrete to cure whereby said concrete forms a hard lining wall within said manhole, said lining wall having an inner circumferential surface;
- disassembling said panels of said form assembly and removing said panels from said manhole whereby said plurality of sheet members combine to cover and provide a protective layer of plastic over said inner circumferential surface of said lining wall.
A method for casting a generally cylindrical lining wall in an existing sewer manhole having an existing manhole wall of generally cylindrical configuration, said existing wall having a bottom and an annular top edge, said method comprising:
- setting a first group of arcuate form panels within said bottom of said existing manhole, said first group of panels being formed into a cylindrically shaped form segment spaced radially inwardly from said existing wall of said existing manhole;
- forming one or more plastic sheet members into a first continuous ring sized to fit in close surrounding relation over said cylindrically shaped form segment, said sheet members having a plurality of protrusions on one surface thereof, said protrusions extending radially outwardly from the outwardly presented surface of said first ring;
- surrounding said cylindrically shaped form segment with said first ring while said form segment is within said existing manhole whereby an annular space is left between said sheet members and said existing manhole wall, said protrusions of said sheet members extending radially outwardly into said annular space;
- assembling additional groups of arcuate form panels above and coaxially with said first group of form panels so as to create a continuous tube shaped form assembly within said existing manhole, and after assembling each additional group of arcuate form panels,
- surrounding each assembled additional group with a respective additional ring formed from said sheet members of plastic sheet material whereby additional annular spaces are left between said additional rings of sheet members and said existing manhole wall, said additional rings of said sheet members having protrusions extending radially outwardly into said annular spaces;
- filling said annular spaces between said rings of said sheet members and said existing manhole wall with concrete with said protrusions of said plastic sheet members being embedded within said concrete;
- permitting said concrete to cure;
- disassembling and removing said form panels from said existing manhole whereby said cured concrete and said sheet members of plastic material form a substantially continuous inner wall for said manhole with said sheet members of plastic material substantially covering and protecting said cured concrete from corrosive materials within said manhole.
Dependencies are inferred from the claim text.