Machine for making a two-diameter pile in the ground

Abstract

The invention relates to a machine (10) for producing a dual-diameter pile in the ground comprising: a casing (12) having a first diameter, the casing having a casing axis and a lower part comprising a first cutting member, the casing being movable in rotation about the casing axis and movable in translation along the casing axis; an auger (20) having a second diameter, smaller than the first diameter, and being coaxial with the casing, the auger having an auger axis and being movable in rotation about the auger axis and movable in translation along the auger axis, the auger having a lower part provided with an injection orifice (30);a coupling device (40), arranged in the lower part of the machine, comprising a free position in which the auger can rotate and translate relative to the casing and a coupled position in which the auger is integral with the casing so that the rotation of the auger causes the concomitant rotation of the casing around the casing axis and the translation of the auger causes the concomitant translation of the casing along the casing axis; and an injection device (32) for injecting a binder into the ground via the injection orifice. Figure for abstract: figure 3;

Claims

lidarizing the auger casing; the auger is driven into the ground to a second depth, so as to drill a second hole in the ground in continuity with the first hole, the second hole having a second diameter smaller than the first diameter; a binder is injected into the ground through the auger orifice while raising the auger to the first depth so as to fill the second hole; the coupling device is brought into the coupled position so as to secure the casing to the auger; the auger is continued to rise, together with the casing, while continuing to inject binder into the ground so as to fill the first hole; then the machine is removed from the ground.

16. The method of claim 15 wherein at least one reinforcing cage (70) is inserted into at least one of the first and second binder-filled holes after removal from the machine.

17. The method of claim 15 or 16, wherein the machine further comprises a liner tube (60) having a third diameter greater than the second diameter and less than the first diameter, the liner tube being coaxial with the casing and the auger being slidable in the liner tube, and wherein the auger rotates relative to the liner tube when drilling the first and / or second hole.

18. A method according to claim 17, wherein the liner tube is locked in rotation relative to the ground during drilling of the first and / or second hole. D1 19 [Fig. 5] 100 A, B, C

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