Method and apparatus for installation of drainage field

  • US 5,051,028 A
  • Filed: 03/11/1991
  • Issued: 09/24/1991
  • Est. Priority Date: 03/04/1988
  • Status: Expired due to Term
First Claim
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1. A method for installing a drainage field, such as for installing a nitrification field employed in a ground absorption sewage treatment and disposal system, comprising:

  • digging a trench of specified length and width;

    placing a plurality of preassembled drainage line units in end-to-end fluid communicating relationship within said trench, each drainage unit comprising a horizontally extending perforated conduit, a loose aggregation of discrete, crush resistant, lightweight elements surrounding said conduit, a perforated sleeve member enveloping said aggregation and bounding the same relative to said conduit to define an aggregate-filled drainage cavity in fluid communication with the perforations of said conduit;

    said drainage cavity having predetermined minimum dimensions in directions outwardly of said conduit, and providing drainage characteristics similar to those of a cavity of the same dimensions constituted by an aggregation of rock or crushed stone;

    interconnecting the ends of adjacent conduits of said units;

    placing in the trench under some of the conduit units a preassembled conduit less unit in fluid communicating relationship to each other and to said conduit units, each conduitless unit comprising a loose aggregation of discrete, crush resistant, lightweight bodies of plastic material, and a tube of perforated material closed at its ends enveloping and bounding said aggregation; and

    filling in said trench with soil and compacting the same to provide a required minimum spacing between the top of said units and the ground surface.

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