Patent ID: 8641326
Filing Date: 2014-02-04
Classification: F16L

Abstract:
1. A method of replacing a section of existing underground pipe, the section having opposite ends, comprising: drilling a series of vertical holes between the opposite ends of the pipe section, each hole intersecting the pipe section to form openings in the pipe section between the opposite ends; supplying slurry material downwardly through the vertical holes to fill the existing pipe section; then drilling with a boring tool in a first direction to form a pilot hole through the existing pipe section; then reaming the pilot hole with a reaming tool in a second direction opposite the first direction to enlarge the diameter of the pilot hole and to break up the existing pipe section; installing a new pipe in the enlarged hole, with the new pipe installation forcing the slurry and broken pipe section upwards into the vertical holes; and removing the slurry and broken pipe through the vertical holes.