Light-weight drainage line units

Liquid purification or separation – Structural installation – Geographic


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405 35, 405 43, 405 45, 405 50, 210747, E02B 1100




A method for manufacturing preassembled drainage line units comprises feeding a length of perforated vent pipe along a direction of manufacture longitudinally through a tubular mandrel, feeding a continuous sleeve of netting concentrically over the vent pipe along the direction of manufacture from a front end of the mandrel and continuously supplying quantities of artificial aggregate into the space between the sleeve of netting and the vent pipe. A low friction coating is applied to the inside surface of the mandrel to reduce the surface friction of the artificial aggregate caused by compaction, and to permit high speed manufacture.

patent: 2540272 (1951-02-01), Malmstrom et al.
patent: 2768949 (1956-10-01), Hewey
patent: 3441140 (1969-04-01), Thurber
patent: 3802337 (1974-04-01), St-Hiliare
patent: 3815323 (1974-06-01), Longo
patent: 3952529 (1976-04-01), Lefever
patent: 4019326 (1977-04-01), Herveling et al.
patent: 4104774 (1978-08-01), Overmyer et al.
patent: 4308020 (1981-12-01), Langen
patent: 4986699 (1991-01-01), Bohnhoff
patent: 5015123 (1991-05-01), Houck et al.


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