Methods for making light-weight drainage line units

Details Methods for making light-weight drainage line units Methods for making light-weight drainage line units

1995-10-31

1997-08-19

Bryant, David P.

Metal working

Method of mechanical manufacture

Assembling or joining

295272, B21D 3903

Patent

active

056575270

ABSTRACT:
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.

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patent: 4716712 (1988-01-01), Gill
patent: 4733449 (1988-03-01), Spearman
patent: 5535499 (1996-07-01), Houck et al.

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