Process and device for pulling a pipe laid or to be laid in...

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

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Details

F16L 1/028 (2006.01) E03F 3/06 (2006.01) E21B 7/30 (2006.01) F16L 55/165 (2006.01)

Patent

CA 2215169

The invention relates to a process for pulling a pipe (2) laid and/or to be laid in the ground to a trench below and accessible from ground level, in which there is a traction system in engagement with a traction component (3). The traction component is taken through the pipe and engaged with its rear end, viewed in the pulling direction. The traction component with the pipe is then drawn to the trench in steps by the traction system, with the traction device making a forward and a backward stroke at each step. During the backward stroke the traction component is kept under a tension corresponding to its elastic expansion during the forward stroke. In this way the traction component is kept permanently under tension throughout the pulling process, thus preventing the traction component from alternately expanding and contracting at each step. In a preferred device for implementing this process, the traction component has catches (4) with a predetermined spacing and the traction system has a pulling member (12) which engages with one of the catches during the forward stroke and a retainer (17) which is engaged with one of the catches during the backward stroke.

La présente invention concerne un procédé de traction d'un tuyau (2) posé ou à poser dans la terre, dans une tranchée en dessous du niveau du sol et accessible depuis la surface, dans laquelle est installé un dispositif de traction en prise avec un élément de traction (3). On fait passer l'élément de traction à travers le tuyau, où il se trouve en prise avec l'extrémité arrière de ce dernier par rapport au sens de traction. L'élément de traction est ensuite tiré par à-coups avec le tuyau à l'aide dudit dispositif dans un mouvement alterné de traction et de poussée. De ce fait, l'élément de traction est maintenu sous une tension constante pendant toute l'opération de traction, ce qui lui évite de subir à chaque à-coup une force d'allongement alternée avec une force de contraction. Dans un dispositif préféré pour la mise en oeuvre de ce procédé, l'élément de traction est pourvu d'encoches (4) espacées selon un intervalle prédéterminé, et le système de traction comprend un organe de traction (12) qui vient en prise avec l'une des encoches pendant la phase de poussée, et un organe de retenue (17) qui vient en prise avec l'une des encoches pendant la phase de traction.

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