UNDERGROUND AND PARTLY SUBMERGED PIPE WINDING APPARATUS AND METHOD.

摘要

An apparatus and method for lining an underground conduit is disclosed. The apparatus (10) comprises: an annular frame (40) having a crown portion (42) and a base portion (49); a strip guide disposed around and supported by the annular frame (40), the guide arranged to guide a strip (12) around a helical path; a pair of strip pinch rollers mounted to the frame (40) at a position circumf erentially about halfway between the crown portion (42) and the base portion (49); a drive assembly mounted to the frame for driving the strip (12) downwards into the helical path in a winding direction so as to present an incoming first edge to an adjacent second edge of a wound convolution of the strip; a liquid remover mounted to the frame, the liquid remover arranged to prevent liquid that has adhered to and ascended with the second edge from descending down towards the incoming first edge; and an extruder (80) mounted to the frame (40) for extruding a molten bead of plastic onto the strip (12) at a position just before said overlap.