Improved auger piling

E - Fixed Constructions – 02 – D

Patent

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Details

E02D 5/36 (2006.01) E02D 15/04 (2006.01) E21B 44/00 (2006.01)

Patent

CA 2228518

There is disclosed a method of con- tinuous flight auger piling and a continuous flight auger rig (1), wherein an auger (2) is applied to the ground so as to undergo a first, penetration phase and a second, with- drawal phase, and wherein the rotational speed of and/or the rate of penetration of and/or the torque applied to the auger (2) during the first, penetration phase are de- termined and controlled as a function of the ground conditions and the auger geom- etry by means of an electronic computer (8) so as to tend to keep the auger flights loaded (11) with soil originating from the region of the tip of the auger (2). During the withdrawal phase, concrete (14) may be supplied to the tip (12) of the auger (2) by way of flow control and measuring means (6, 7), the rate of withdrawal of the auger (2) being controlled as a function of the flow rate of the concrete (14), or vice versa, by means of an electronic computer (8) so as to ensure that sufficient concrete (14) is supplied to keep at least the tip (12) of the auger (2) immersed in concrete (14) during withdrawal.

L'invention a pour objet un procédé pour enfoncer une tarière formant vis sans fin, et un appareil de forage (1) à tarière formant vis sans fin. Dans cet appareil, une tarière (2) est appliquée au sol de manière à subir une première phase de pénétration, et une deuxième phase de retrait. La vitesse de rotation et/ou la vitesse de pénétration de la tarière (2) et/ou le couple appliqué à cette dernière pendant la première phase de pénétration sont déterminés et commandés en fonction des conditions du sol et de la géométrie de la tarière, à l'aide d'un ordinateur électronique (8) pour assurer le chargement (11) de la tarière avec la terre provenant de la pointe de cette dernière (2). Durant la phase de retrait, le béton (14) peut être fourni à la pointe (12) de la tarière (2) par des moyens de mesure et de contrôle de débit (6, 7), la vitesse de la tarière (2) étant commandée en fonction du débit du béton (14) ou vice-versa, au moyen d'un ordinateur électronique (8) . Cela permet d'assurer l'apport d'une quantité suffisante de béton (14) pour qu'au moins la pointe (12) de la tarière (2) reste immergée dans le béton (14) lors du retrait.

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