Lightweight, corrosion-resistant sewer pipe - has plastic lining and casing and load-resistant steel or cast-iron@ core tube

摘要

Drain-pipe for a sewer, seepage from a rubbish dump etc., has a plastic lining and/or outer casing, and a steel or cast-iron core tube resistant to heavy loads. Polyethylene can be melted or otherwise applied onto the inside and outside of the core tube, or inner and outer casings can be slid into and onto the core tube. Inlet ports can be incorporated for water seeping from a dump, and inside which inserted bushes can be welded. ADVANAGE - Light weight, very high resistance to corrosion, and high load capacity.