Manhole repairs

Abstract

A method and apparatus for repairing manholes with a liner. The liner can be assembled from side plates and connector plates. The liner is conveniently inserted into a damaged manhole, is adjusted, and concrete is poured behind the liner into voids above the manhole brickwork.

1 . A liner for use in repairing brickwork holes, comprising a plurality of side plates and an equal number of connector plates;
 wherein the connector plates are adjustably engageable with respect to the side plates thereby allowing adjustment of the outer perimeter of the liner;   the liner further comprising one or more support flanges.   
     
     
         2 . A liner according to  claim 1 , wherein the connector plates are slidably engageable with respect to the side plates. 
     
     
         3 . A liner according to  claim 1 , wherein one or more of the support flanges are movable in relation to the liner. 
     
     
         4 . A liner according to  claim 1 , wherein the one or more support flanges comprise a lip flange on the perimeter of the liner. 
     
     
         5 . A liner according to  claim 1 , having four side plates and four connector plates, wherein the side plates comprise flat rectangular plates and the connector plates comprise right-angled corner plates, thereby forming a rectangular outer perimeter of the liner. 
     
     
         6 . A liner according to  claim 1 , wherein the side plates and connector plates comprise metal, for example iron or steel. 
     
     
         7 . A liner according to  claim 1 , wherein the side plates and connector plates comprise plastic or fiber glass. 
     
     
         8 . A method of repairing manholes comprising;
 inserting a liner according to  claim 1  into the manhole;   adjusting the liner to fit the manhole;   optionally moving one or more support flange to rest on existing brickwork; and   pouring concrete behind the liner into voids above the existing brickwork.