| 摘要 |
<p>The present invention relates to a device for the on-site restoration of conduits inaccessible from the interior, characterised in that each module (1, 2) is provided with arms (3, 5) which can move by virtue of a hydraulic means (4, 6) connected to a hydraulic pump (8) arranged at the surface, from an out-of-service position in which the arms (3, 5) define a diameter considerably less than that of the conduit (7) to be restored, into a working position in which the arms (3, 5) define a diameter equal to or very slightly less than that of the conduit (7) to be restored, in such a way that the front module (1), by pressing the arms (3) against the damaged inner walls of the conduit (7), performs the role of a spreader and a guide so as to restore the said conduit (7) to its initial diameter and to permit the passage of the rear module (2) which, for its part, is provided at each of its two ends with sealing means (9) defining with the conduit (7) a chamber (10) into which opens at least one tube (11) for the intake of the choking product, connected to a pump (12) arranged at the surface.
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