| 摘要 |
<p>An intermediate pipe-jacking apparatus is adapted to propel pipes such as sewer pipes, conduit pipes and the like in the ground between a start shaft and a destination shaft in order to install the pipes in the ground. More specifically, the intermediate pipe-jacking apparatus disposed between the pipes to be propelled comprises a movable frame (14) disposed inside the pipes, a plurality of hydraulic jacks (12) supported by the frame, and an operating mechanism (16) for shifting the hydraulic jacks between the operative position between the end faces of the pipes and the inoperative position inside the pipes, wherein the frame is provided with a pair of hollow end frame members (28,30), and a plurality of rod members (38) rotatably supported by the respective end frame members, and each rod member is pivotted by the operating mechanism so as to displace the hydraulic jacks between the operative position and the inoperative position.</p> |
