Method of extracting a hollow unit laid in the ground

F - Mech Eng,Light,Heat,Weapons – 16 – L

Patent

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Details

F16L 1/036 (2006.01) E21B 23/00 (2006.01) E21B 31/20 (2006.01) F16L 1/028 (2006.01) F16L 1/11 (2006.01)

Patent

CA 2211852

Disclosed is a method of extracting a hollow unit laid in the ground, such as a lead pipe (2) which is accessible at both its open ends. For this purpose, a flexible tube (14) which can be pressurised from inside is introduced in its unpressurised state into the pipe, then pressurised from inside to force the flexible tube against the inner wall of the pipe, and the pipe is then pulled along its longitudinal axis out of the ground, using the flexible tube, during which procedure the internal flexible tube pressure is maintained and there is no axial movement between flexible tube and pipe. Rupture of the pipe during extraction is thus avoided. A new pipe, which is laid in the ground as the old one is being removed, can be connected to the flexible tube or to the lead pipe being extracted behind the rear end (in relation to the direction of pull) of the lead pipe. An additional traction element (12) can be introduced into the pipe together with the flexible tube; this element is forced against the inner wall of the pipe by the inner pressure of the pressurised flexible tube and used either on its own or with the flexible tube to pull out the pipe.

La présente invention concerne un procédé d'extraction d'un objet creux enterré, par exemple un tuyau en plomb (2) qui est accessible à ses deux extrémités ouvertes. On introduit dans le tuyau à extraire un tuyau souple (14), dans lequel on peut établir une pression intérieure, sans pression lors de l'introduction. Ensuite, on établit une pression à l'intérieur de ce tuyau souple et il se presse contre la paroi intérieure du tuyau rigide, après quoi, tout en maintenant la pression intérieure, on retire du sol le tuyau rigide en le tirant longitudinalement au moyen du tuyau souple sans qu'il y ait déplacement axial de l'un par rapport à l'autre. On évite ainsi la rupture du tuyau en plomb lors de son extraction. Derrière l'extrémité arrière du tube en plomb, vu dans le sens de la traction, on peut accoupler un tuyau neuf au tuyau souple ou au tuyau en plomb qu'on veut extraire; il est tiré dans le sol en même temps qu'a lieu l'extraction du tuyau en plomb. Une pièce de traction supplémentaire (12) peut être introduite dans le tuyau rigide en même temps que le tuyau souple et pressée contre la paroi intérieure du tuyau rigide par le tuyau souple dans lequel on établit une pression intérieure. Elle est utilisée soit seule, soit en combinaison avec le tuyau souple, pour extraire le tuyau rigide.

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