Abstract: The invention relates to a vibrator device for a vibratory compacting machine, said device comprising: a tubular body extending longitudinally and having a bottom end; at least one first hydraulic motor disposed in the tubular body and comprising a rotor and a stator; an eccentric member arranged inside the tubular body between the bottom end and the first hydraulic motor, said eccentric member being adapted to be rotated by the rotor of the first hydraulic motor so as to generate vibration. The invention is characterized in that the stator of the first hydraulic motor is constituted by the tubular body.

Abstract: The invention relates to a drilling tool comprising: two pairs of rotary drums in axial alignment on parallel axes; a motor mechanism for driving rotation of the drums; a support element; and a support structure on which the drums are mounted to rotate and serving to connect the drums to the support element; the tool being characterized in that the motor mechanism is mounted inside the drums and in that the support structure comprises a plate forming bearings at its bottom ends for the drums; and a mounting pad for fastening to the support element.

Abstract: The invention relates to an auger for making a borehole that presents in its inside wall a groove that is substantially helical, said auger comprising: a hollow core provided with an outer helical blade; a movable cutter gouge suitable for taking up an active position in which the gouge projects outside the volume defined by the periphery of the blade, and a retracted position in which it is placed inside said volume; and means for displacing said gouge from its retracted position to its active position and comprising an additional member mounted to move in said core in translation and/or in rotation, and placed at the bottom end of said core, together with control means for causing said gouge to be displaced from its retracted position to its active position in response to said additional member moving relative to at least the bottom portion of said hollow core.

Abstract: The invention relates to a machine for scraping away sediment or the like deposited on the bottom of a gallery. The machine comprises: a first movable body suitable for moving over the bottom portion of the wall of the gallery; first movement means for moving said first movable body; scraper means for detaching sediment from the bottom; first buffer storage means mounted on said first movable body; first transfer means for transferring detached sediment into said first storage means; second transfer means for transferring sediment stored in said first buffer storage means to the outside of said first movable body; a second movable body; second movement means; and second storage means mounted on said second movable body to collect the transferred sediment.

Abstract: The invention relates to a drilling tool comprising: two pairs of rotary drums in axial alignment on parallel axes; motor means for driving rotation of said drums; support means; and a support structure on which said drums are mounted to rotate and serving to connect said drums to the support means; said tool being characterized in that said motor means are mounted inside the drums; and in that said support structure comprises a plate forming bearings at its bottom ends for said drum; and a mounting pad for fastening to the support means, the top edge face of the plate connecting said pad to the bearing-forming means.

Abstract: The machine for making a continuous wall in the ground comprises a rear portion having means for filling the portion of trench located behind the machine with concrete; a front portion having cutter means for making a portion of trench in front of the machine; and means for modifying the distance between said front and rear portions in a horizontal direction. The machine is characterized in that said cutter means include vertical guide means, at least one rotary cutter having an axis of rotation that is horizontal and parallel to the width of the trench, and means for moving said cutter along the guide means between a bottom position corresponding to the bottom of the trench and a top position disposed above the trench, said cutter being suitable both for cutting the ground of the trench and for kneading it in order to obtain a material in the pasty state.

Abstract: The present invention relates to a machine for digging a trench and making a wall in said trench, the machine being suitable for advancing along a path and having rear and front portions relative to the direction of advance of the machine, together with excavator means disposed in the front portion of the machine and defining a substantially vertical cutting front; wall-forming means situated in the rear portion of the machine; and propulsion means suitable for causing the machine to advance along said path. The machine also has a central portion, controllable brake means for slowing advance or blocking at least one portion of the machine, and controllable connection and disconnection means for connecting and disconnecting the central portion respectively with the front and rear portions of the machine, thereby enabling the type of excavator means and the type of wall-forming means to be changed.

Abstract: The invention relates to an auger for making a borehole that presents in its inside wall a groove that is substantially helical, said auger comprising: a hollow core provided with an outer helical blade; a movable cutter gouge suitable for taking up an active position in which the gouge projects outside the volume defined by the periphery of the blade, and a retracted position in which it is placed inside said volume; and means for displacing said gouge from its retracted position to its active position and comprising an additional member mounted to move in said core in translation and/or in rotation, and placed at the bottom end of said core, together with control means for causing said gouge to be displaced from its retracted position to its active position in response to said additional member moving relative to at least the bottom portion of said hollow core.

Abstract: The present invention relates to a machine for digging a trench and making a wall in said trench, the machine being suitable for advancing along a path and having rear and front portions relative to the direction of advance of the machine, together with excavator means disposed in the front portion of the machine and defining a substantially vertical cutting front; wall-forming means situated in the rear portion of the machine; and propulsion means suitable for causing the machine to advance along said path. The machine also has a central portion, controllable brake means for slowing advance or blocking at least one portion of the machine, and controllable connection and disconnection means for connecting and disconnecting the central portion respectively with the front and rear portions of the machine, thereby enabling the type of excavator means and the type of wall-forming means to be changed.