초록 ▼

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 t

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.

대표청구항 ▼

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 assemb

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.