Replacement of underground pipes

Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement

Reexamination Certificate

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Details

C405S156000, C138S097000

Reexamination Certificate

active

07448829

ABSTRACT:
This document discusses, among other things, devices, apparatuses, and methods for the replacement of existing underground pipes. In general, an apparatus comprises a body, including a receiving portion, and a breaking assembly adapted to be positioned within the receiving portion and detachably coupled to the body. In one example, the body and the breaking assembly are adapted, when coupled, to split the existing underground pipe when pulled therethrough using one or more cutting wheels. In varying examples, each cutting wheel radially protrudes out of a breaking assembly housing an increasing amount along a length of the apparatus allowing for a clean, progressive cut of the existing pipe. In another example, the body and the breaking assembly are adapted, when coupled, to burst the existing pipe when pulled therethrough. Advantageously, the present devices, apparatuses, and methods may provide replacement of underground pipes requiring minimal excavation and making economical use of parts.

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U.S. Appl. No. 60/568,159.
“Typical Grundoburst Set-Up”, http://www.tttechnologies.com/methods/hyd—stat/index.html, (2004), 2 pgs.
Davis, Gerald , “Anatomy of an abrasive cutting machine: More than the sum of its parts”, http://www2.thefabricator.com/Articles/Tube—and—Pipe—Article.cfm?ID=154, (Jun. 13, 2002), 6 pgs.
Davis, Gerald , “Anatomy of an abrasive cutting machine: More than the sum of its parts”, http://www2.thefabricator.com/Articles/Tube—and—Pipe—Article.cfm?ID=154, (Jun. 13, 2002),6 pgs.

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