Damage protection for in-ground pipe founded in expansive soils

Details Damage protection for in-ground pipe founded in expansive soils Damage protection for in-ground pipe founded in expansive soils

1995-04-05

1996-06-18

Arola, Dave W.

Pipe joints or couplings

With casing, lining or protector

285 55, 285236, 138146, 138151, 138105, 405157, F16L 1112

Patent

active

055270700

ABSTRACT:
An in-ground installed pipe system, laid in expansive type soils, that has a plastic-like wrapping of the main pipe area and a plastic-like covered cushion layer of the joint connections, to provide protection to a pipe system against pipe movement and joint connection disruption, during the swelling and shrinkage process of the surrounding expansive soil, during seasonal variations of moisture content of the soil. The plastic-like wrapping of the pipe section is usually installed prior to installing the pipe into the trench. The plastic-like covered cushion layer is installed around the pipe joint connection, in the trench, after the pipe is installed into the end of the previously laid pipe section. The plastic-like wrapped main pipe section provides a longitudinal slip plane between the moving surrounding soil and the pipe, and the plastic-like covered cushion layer provides clearance for movement of the surrounding soil adjacent to the pipe joint connection, so that the moving soil will not disrupt the pipe joint connection. The obvious benefit of this system of installation is to prevent pipe breakage and/or pipe joint connection separation, which would allow surrounding liquid or gas enter the pipe, or allow liquid or gas from within the pipe to be lost into the surrounding soil.

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