Abstract: The invention relates to a method of fabricating an element in ground (S), the method comprising: a step of drilling an excavation (T) in the ground; and a step of mixing the ground in place in the excavation in situ with a geopolymer.

Abstract: The invention relates to a method of fabricating an element in ground (S), the method comprising: a step of drilling an excavation (T) in the ground; and a step of mixing the ground in place in the excavation in situ with a geopolymer.

Abstract: Systems and methods for fabricating a retaining wall include an operation for making an untreated wall in the ground. This may be done by digging a trench in the ground and simultaneously mixing the ground in situ with a binder. Next may be a further operation for excavating a volume of ground adjacent to the untreated wall so as to uncover a surface of the untreated wall. Following that may be a further operation for treating the untreated wall during which a protective treatment substance comprising a polymer substance is applied to the surface that was uncovered in such a manner as to obtain a retaining wall of a thickness that is substantially equal to the thickness of the untreated wall.

Abstract: A method for making a wall in soil. The method may include forming a trench in the soil; filling the trench with a self-hardening material; supplying at least one prefabricated element that has two plates connected together by a connection member; and positioning the prefabricated element in the trench filled with the self-hardening material.

Abstract: The invention relates to a method of fabricating a retaining wall (20), the method comprising: a step of making an untreated wall (10) in ground (S), comprising a step of digging a trench in the ground and a step of simultaneously mixing the ground in situ with a binder; and a step of excavating a volume of ground adjacent to the untreated wall so as to uncover a surface (16) of the untreated wall. The invention is characterized by the fact that said method further comprises: a step of treating the untreated wall during which a protective treatment substance comprising a polymer substance is applied to said surface in such a manner as to obtain a retaining wall of thickness (e5) that is substantially equal to the thickness (e1) of the untreated wall.

Abstract: The present invention relates to a method of making a wall in soil, the method comprising at least the steps consisting in forming a trench in the soil; filling the trench with a self-hardening material; supplying at least one prefabricated element comprising two plates connected together by connection means; and positioning the prefabricated element in the trench filled with the self-hardening material. The invention also provides a wall that can be obtained by this method.

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 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 invention relates to a cutting tool for digging vertical trenches, the tool comprising: a jib (B); a cutter structure (34; C) suspended from the jib via a cable; a plurality of cutter members (18) disposed on at least one cylindrical surface; a motor assembly (12); power supply means (46) for powering said motor assembly (12). releasable retention means (22; 44) for securing at least a portion of the motor assembly (12) having the cutter members (18) mounted thereto to the bottom end of the structure (34); relative positioning means between the structure (34) and the motor assembly (12); and means for connecting the power supply means (46) to the motor assembly (12); whereby at least a portion of the motor assembly (12) with the cutter members (18) can easily be separated from the structure (34) of the machine.

Abstract: The present invention provides a head for injecting a fluid under pressure for breaking up the ground from a borehole and mounted at the end of a string of rods. The body of the drilling head has a bottom wall for mounting a mechanical drilling tool having a feed pipe, at least one injection nozzle, and duct-forming means for connecting the feed pipe with liquid at the inlet of said nozzle, the duct-forming means presenting a mean line having a radius of curvature that varies continuously, the right section of said duct-forming means decreasing regularly over at least half its length from its first end towards its second end. The injection head further comprises at least one pipe for feeding said mechanical tool, said pipe being connected at a first end to said duct-forming means and at a second end to a chamber disposed at the bottom end of said injection head and fitted with a controllable shutter member interposed between said chamber and the pipe for feeding said mechanical tool.

Abstract: Excavator drum for the production of vertical trenches, including a cylindrical shell (22) mounted so sa to rotate about its axis of revolution and a plurality of excavating tools (28, 30) mounted on the external face of the shell. The tools include a plurality of first rollers (36) equipped with cutting elements (38) mounted so as to rotate about axes, the mid-plane of the rollers substantially merging with the mid-plane (P-P?) of the shell, and the length of which is less the an the length of the shell; and a plurality of pairs of second rollers (50, 52) equipped with cutting elements, the rollers of the same pair being mounted so as to rotate about cantilever axles (54, 56) each roller having a length at least equal to the distance that separates one end a first roller from the corresponding end of the shell, the casing of the external end of the second rollers being at least in the plane containing one end (32, 34) of the shell.

Abstract: A drilling machine comprising: a frame; at least one pair of rotary drilling tools having substantially the same axis of rotation; and a support assembly secured to the frame and supporting said pair of tools in rotation, said support assembly presenting an edge facing the cutting face and extending between the tools of said pair of tools, said machine further comprising: means mounted on said support assembly for creating at least one jet of liquid at very high pressure directed towards the cutting face between the action zones of said pair of tools; whereby said jet of liquid at very high pressure breaks up the ridge which forms in the cutting face between the action zones of said pair of rotary tools.

Abstract: The present invention provides a head for injecting a fluid under pressure for breaking up the ground from a borehole and mounted at the end of a string of rods. The body of the drilling head has a bottom wall for mounting a mechanical drilling tool having a feed pipe, at least one injection nozzle, and duct-forming means for connecting the feed pipe with liquid at the inlet of said nozzle, the duct-forming means presenting a mean line having a radius of curvature that varies continuously, the right section of said duct-forming means decreasing regularly over at least half its length from its first end towards its second end. The injection head further comprises at least one pipe for feeding said mechanical tool, said pipe being connected at a first end to said duct-forming means and at a second end to a chamber disposed at the bottom end of said injection head and fitted with a controllable shutter member interposed between said chamber and the pipe for feeding said mechanical tool.

Abstract: The invention relates to a cutting tool for digging vertical trenches, the tool comprising: a jib (B); a cutter structure (34; C) suspended from the jib via a cable; a plurality of cutter members (18) disposed on at least one cylindrical surface; a motor assembly (12); power supply means (46) for powering said motor assembly (12). releasable retention means (22; 44) for securing at least a portion of the motor assembly (12) having the cutter members (18) mounted thereto to the bottom end of the structure (34); relative positioning means between the structure (34) and the motor assembly (12); and means for connecting the power supply means (46) to the motor assembly (12); whereby at least a portion of the motor assembly (12) with the cutter members (18) can easily be separated from the structure (34) of the machine.

Abstract: Excavator drum for the production of vertical trenches, comprising a cylindrical shell (22) mounted so as to rotate about its axis of revolution and a plurality of excavating tools (28, 30) mounted on the external face of the said shell.