发明名称 |
Light-weight drainage line units |
摘要 |
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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申请公布号 |
US5639364(A) |
申请公布日期 |
1997.06.17 |
申请号 |
US19950455702 |
申请日期 |
1995.05.31 |
申请人 |
HOUCK, RANDALL J.;HOUCK, MICHAEL H. |
发明人 |
HOUCK, RANDALL J.;HOUCK, MICHAEL H.;HOUCK, HAROLD J. |
分类号 |
E02B11/00;F16L1/06;(IPC1-7):E02B11/00 |
主分类号 |
E02B11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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