| 摘要 |
A pipe replacement system (20) includes a stationary hydraulic jack (52) for pushing sections of new pipe (22) which, in turn, push a frontal cone expander (36) to break up old pipe (10) and define a path for the new pipe. A frontal apparatus (24) located in front of the new pipe and pushed thereby can include a hydraulic jack (40) for independently advancing the cone expander without operating the stationary hydraulic jack.
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