| 摘要 |
The invention discloses a system for splitting and spreading existing underground pipe and pipe fittings. A plurality of cutter wheels (11, 12) are positioned within a cutter assembly frame (10). A plurality of paired pipe expanders (15, 16) are formed on the outer periphery of the cutter assembly frame. A mandrel (17) is connected to the trailing end of the cutter assembly and to a pipe adapter (18) which in turn is connected to a foremost section of new pipe (20). The mandrel spreads the cut pipe and fittings and pulls the pipe adapter and the new pipe through the bore of the existing pipe. A train comprised of multiple sections of steel rods (22) is connected to a leading end of the cutter assembly and pulls the cutter assembly and mandrel and pipe adapter and the new pipe through the bore of the existing pipe and pipe fittings.
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