Apparatus for replacing mains

Details Apparatus for replacing mains Apparatus for replacing mains

1986-08-04

1988-01-19

Taylor, Dennis L.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

30 925, 138 97, 29234, 166 552, 225103, 405184, F16L 5518, F16L 100

Patent

active

047202114

ABSTRACT:
An apparatus for replacing an existing buried pipe of a crackable, fracturable material. The apparatus has a fracturing structure which applies an intense local pressure to crack and fracture the existing buried pipe into irregular fragments. This fracturing structure can include one or a plurality of blades, some of which may be retractably and expandably movable. The structure which exerts the intense local pressure is also operable to effect at least some outward movement of the fragments. An expansion structure moves the fragments radially outwardly, generally about the axis of the existing main, to provide a passage for a replacement tubular assembly. The apparatus is moveable through the existing main by the action of either a pushing or a pulling force, and the pushing force may be applied by percussive action.

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patent: 4100980 (1978-07-01), Jenne
patent: 4118940 (1978-10-01), Beane

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