Patent ID: 7334820

Claim:
A concrete pipe ( 2 ) comprising the combination of: a single corrosion-resistant inner lining ( 1 ) of plastic, two opposite ends, one end of which is shaped to protrude as a pipe spigot end part ( 3 ) and an opposite end of which is shaped as a pipe socket end part ( 4 ) to receive a pipe spigot end part ( 3 ) of a following pipe ( 2 ), the single corrosion-resistant inner lining ( 1 ) of plastic projecting past the respective pipe spigot end part ( 3 ) to form an inwardly-situated overhang ( 5 ) from a pipe joint formed by respective mating of spigot ( 3 ) and socket ( 4 ) end parts to define part of an inner annular surface of the pipe ( 2 ) directly contacting the inner lining ( 1 ) of a pipe member having the adjacent socket end part ( 4 ) and directly covering the pipe joint from the inner annular direction and mate with a single corrosion-resistant lining ( 1 ) of plastic situated annularly outwardly therefrom upon the following pipe ( 2 ), an annular peripheral groove ( 13 ) being arranged at an interior ( 7 ) of the inner plastic lining ( 1 ) to accept an elastomer seal ( 14 ), with an adjacent overhang ( 5 ) covering the peripheral groove ( 13 ) when respective socket ( 4 ) and spigot ( 3 ) end parts are mated, the single inner lining ( 1 ) of plastic also lining the pipe socket end part ( 4 ) of the concrete pipe ( 2 ) to face the adjacent spigot end part ( 3 ) of a following pipe ( 2 ) when mated, without any abutment seam being present along the plastic lining ( 1 ) at a transition to the pipe socket end part ( 4 ), and the single inner lining of plastic ( 1 ) merging in one piece from an outer end of the pipe socket end part ( 4 ) to the pipe spigot end part ( 3 ) without any abutment position or welding seam.