Abstract: Plastic liner sections define a drainage channel when placed end to end. Each end has a stiff, double walled flange at each side of the end adapted to butt up to a similar flange at the adjacent end of the next sections. The double walled construction of the flanges stiffens the ends significantly reducing the risk of deformation by the hydrostatic forces produced by wet concrete during installation. A groove is formed inwardly of the flanges on a female end of the liner section and receives a sealing ring, which is held in place by a lip formed on a male end.

Abstract: Plastic liner sections (2) define a drainage channel when placed end to end. Each end (6,8) has a stiff, double walled flange (34) at each side of the end adapted to butt up to a similar flange (34) at the adjacent end of the next sections (2). The double walled construction of the flanges (34) stiffens the ends (6,8) significantly reducing the risk of deformation by the hydrostatic forces produced by wet concrete during installation. A groove (24) is formed inwardly of the flanges (34) on a female end (6) of the liner section (2) and receives a sealing ring (52), which is held in place by a lip (26) formed on a male end (8).

Abstract: A liner for use in casting a drainage block has an arched surface which defines an upper profile of a main drainage channel and the water inlets opening into the outer surface of the block as well as providing clips for supporting and locating reinforcing bars during the casting of the blocks.

Abstract: A liner for use in casting a drainage block has an arched surface which defines an upper profile of a main drainage channel and the water inlets opening into the outer surface of the block as well as providing clips for supporting and locating reinforcing bars during the casting of the blocks.