Method for reducing frictional losses in tunnels

Details Method for reducing frictional losses in tunnels Method for reducing frictional losses in tunnels

E - Fixed Constructions

21

D

E21D 11/00 (2006.01) E02B 9/06 (2006.01) F16L 55/18 (2006.01)

Patent

CA 2357875

Method for reducing frictional loss in unlined tunnels or other tunnels with a rough wall surface and/or irregular cross section. A flexible or rigid pipe with a cross section similar to or somewhat less than the largest circularly open cross section of the tunnel is introduced into the tunnel and attached continuously or at certain points to parts of the tunnel wall. Means ensuring that a superpressure occurs within the pipe relative to its outside during flow are also introduced.

L'invention concerne un procédé de réduction des pertes de charge dans des tunnels non revêtus ou autres tunnels comportant une surface rugueuse de la paroi et/ou une section transversale irrégulière. Un tuyau souple ou rigide, dont la section transversale est similaire à ou légèrement inférieure à la plus grande section transversale ouverte en cercle du tunnel, est introduit dans le tunnel et fixé en continu ou à certains points à des parties de la paroi du tunnel. Des moyens sont également introduits dans le tunnel pour assurer l'événement d'une surpression à l'intérieur du tuyau relativement à la partie extérieure de ce dernier pendant l'écoulement.

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