EP3754154B1 - Maschine zum aufbohren eines mit einer porösen schicht bedeckten bodens, und entsprechendes verfahren - Google Patents

Maschine zum aufbohren eines mit einer porösen schicht bedeckten bodens, und entsprechendes verfahren Download PDF

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Publication number
EP3754154B1
EP3754154B1 EP20179234.8A EP20179234A EP3754154B1 EP 3754154 B1 EP3754154 B1 EP 3754154B1 EP 20179234 A EP20179234 A EP 20179234A EP 3754154 B1 EP3754154 B1 EP 3754154B1
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EP
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Prior art keywords
protection tube
drill pipe
drilling
machine
porous layer
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EP20179234.8A
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English (en)
French (fr)
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EP3754154A1 (de
Inventor
Bruno DEMARCQ
Christophe REYNA
Maxime SITERRE
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Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

  • the present invention relates to the field of drilling techniques in the ground, and more particularly to so-called small perforation drilling techniques under fluid circulation.
  • drilling fluid a liquid, called drilling fluid
  • a reinforcement is then placed in the borehole, or else the tool is left in the borehole with its drive rod, before injecting a sealing grout therein.
  • One solution to protect a platform against infiltration is to recover the fluid at the drill head. Such a solution is usually done by digging a pit into which a suction (pump) is plunged. Alternatively, there are also tanks drilled in line with the borehole and fitted with a suction mouth, which makes it possible to avoid digging the pit.
  • a suction pump
  • FR2998593 and FR2869066 disclose known drilling techniques using a protection tube.
  • the present invention aims to solve the various technical problems mentioned above.
  • the present invention aims to provide a machine making it possible to limit the infiltration of drilling fluid and to preserve the upper layer of the drilled soil.
  • the present invention aims to provide a drilling machine that does not deconstruct the platform and does not require the installation of a recovery tank.
  • a machine for drilling, under fluid circulation, a ground covered with a porous layer, for example a layer of ballast.
  • the machine comprises a drive head for rotating a drill pipe, and means for circulating a drilling fluid configured to inject a drilling fluid through the drill pipe.
  • the machine is also configured to insert, through the porous layer, a shroud extending around the drill pipe and leaving an intervening tubular space between the drill pipe and the shroud.
  • the machine also comprises first means for recovering the drilling fluid configured, during the insertion of the protection tube through the porous layer, to suck, from the upper end of the protection tube, the drilling fluid coming from the drill rod, present at the lower end of the protective tube and rising, preferably, via said intermediate tubular space.
  • the machine according to the present invention uses a protective casing, in addition to the drill rod, without using a double head, to preserve the integrity of the platform, and in particular of the porous layer, and ensures sealing by continuous suction at the casing head. It is then possible to have autonomous use of the machine that does not require any previous step, such as as the installation of a pit or drilled tanks, while limiting the infiltrations of drilling fluid, in particular in the porous layer.
  • the machine also comprises second means for recovering the drilling fluid, the second recovery means being configured to evacuate the drilling fluid coming from the drill rod and emerging via the upper end of the protection tube, preferably via said intermediate tubular space, when the protection tube is positioned through the porous layer.
  • the protection tube remains in place, to continue to isolate the drilling, and in particular the circulation of drilling fluid, from the porous layer.
  • the protective tube is detached from the machine, and in particular from the drive head.
  • the drilling tool continues to dig, under the porous layer, with a circulation of fluid: the latter is then recovered through the intermediate tubular space between the protection tube and the drill pipe.
  • the first and second recovery means comprise a common pump and a connecting means configured to connect the common pump to the first recovery means during the insertion of the protective tube through the porous layer, and to connect the common pump to the second recovery means when the protection tube is positioned through the porous layer.
  • the drilling fluid is not recovered in the same way in the different stages of drilling, in particular because the protection tube is inserted gradually with the drill pipe at first, then remains static in a second phase. time, when positioned through the drilling layer.
  • the recovery means used are different according to the drilling steps, but can be connected to the same pumping means in order to limit the costs and the volume of the machine.
  • the second recovery means are configured to be positioned at the upper end of the protection tube when the protection tube is positioned through the porous layer, the second recovery means comprising a reservoir, preferably in the form of crown, into which the drilling fluid coming out of the protection tube is poured, and a peripheral seal, preferably circular, which creates a seal between the tank and the outer wall of the protection tube.
  • the upper end of the latter generally comes flush with the surface of the drilled ground.
  • the drilling fluid injected at the level of the drilling tool can rise alone, under the effect of the pressure and/or the flow rate, as far as said upper end of the protection tube. It no longer suffices then, to recover this drilling fluid, to collect it in a reservoir situated at the upper end of the protection tube, and to suck it up with a pump.
  • the peripheral seal is an inflatable seal.
  • the inflatable seal allows easy installation at the upper end of the protection tube, while guaranteeing a desired seal thanks to the control of the pressure applied in the inflatable seal.
  • the drive head is configured to also drive the protection tube in rotation, preferably at the same time as the drill pipe, during the insertion of the protection tube through the porous layer.
  • the rotational drive of the protection tube facilitates its insertion into the ground, and in particular through the porous layer, at the same time as the drill pipe. Such driving does not require dual head hardware, but can be performed simultaneously with the drill pipe. Once the protective tube has been positioned, all you have to do is separate it from the drive head to leave it in place, and continue only with the drill rod.
  • the drive head comprises means for mounting the drill rod, having a first determined diameter, and means for mounting the protection tube, having a second determined diameter greater than the first determined diameter.
  • the drill pipe and the protection tube are mounted on the head by mounting means which may differ only in their diameter. This facilitates the use of the machine, allowing installation and removal procedures which are similar for the protection tube and the drill pipe.
  • the first fluid recovery means are mounted on the drive head, for example above the protection tube mounting means.
  • Such a mounting of the first recovery means on the drive head makes it possible to maintain suction at the upper end of the protective tube throughout the duration of depression of said protective tube through the porous layer and the underlying layer. underlying.
  • a work train comprising a machine for drilling a ground covered with a porous layer as described above.
  • the drilling machine has been designed in such a way as to allow the use of standard equipment, and not heavy equipment such as a double head or specific duplicate equipment for the protective tube on the one hand and for the drill rod on the other hand. It then becomes possible to install it on a railway vehicle, such as a works train, in order to be able to move it along the site, as the work progresses.
  • the work train comprises a drilling fluid reservoir connected to the drive head, drilling fluid suction means configured to be connected to the recovery means, and cement slurry supply means configured to be connected to the drive head.
  • Such a work train can thus transport the various elements necessary for the operation of the machine for drilling and for carrying out the work.
  • the works train also includes a sludge recovery system, for example a settling tank, mounted downstream of the recovery means.
  • a sludge recovery system for example a settling tank, mounted downstream of the recovery means.
  • the sludge recovery system can be configured to operate with the sludge from the first recovery means and from the sludge from the second recovery means.
  • the mud recovery system makes it possible in particular to recover part of the drilling fluid directly from the work train to reuse it in situ, and makes it possible to store the material removed during drilling in order to limit the impact of the work on the site.
  • a method of drilling under fluid circulation, in ground covered with a porous layer, for example a layer of ballast.
  • a drill pipe is rotated, and a drilling fluid is injected through the drill pipe, preferably while the drill pipe is rotating.
  • a protective tube extending around the drill pipe and leaving an intermediate tubular space between the drill pipe and the protective pipe is inserted through the porous layer, and suction is taken from the upper end of the protection tube, the drilling fluid coming from the drill pipe, present at the lower end of the protection tube and rising, preferably, via said intermediate tubular space, when the protection tube is inserted through the porous layer.
  • the protection tube is left in place and the drilling fluid coming from the drill pipe and emerging through the upper end of the tube is evacuated. protection, preferably via said intermediate tubular space.
  • the protection tube is driven at the same time as a first part of drill rod equipped, at its end, with a tool, then, during the second step, a second part of rod is assembled to the first drill pipe part and the two drill pipe parts are rotated while injecting a drilling fluid therethrough and discharging the fluid emerging from the upper end of the protection tube, preferably via said intermediate tubular space.
  • the drilling machine 1 thus comprises a support 2 on which is mounted a frame 4.
  • the support 2 is intended to come, jointly, on a railway carrier (not shown), conventionally a railway wagon, making it possible to transport and route the machine for drilling 1 along the rails R of a railway track.
  • a railway carrier not shown
  • Such an embodiment is particularly advantageous when the drilling machine 1 is used to install catenary pylon micro-piles along the railway track, through the layer of ballast.
  • the frame 4 is rotatably mounted on the support 2, with respect to a vertical axis: it is thus possible to position the drilling tool next to the railway carrier , or above the railway carrier, depending on whether the drilling machine 1 must install a pylon micro-pile or else must be moved.
  • the drilling machine 1 also comprises a mast 6 extending in a longitudinal direction, and pivotally mounted on the frame 4, with respect to a horizontal axis, for example via cylinders 8.
  • the cylinders 8 thus make it possible to position the mast 6 horizontally, in particular above the railway carrier, when the drilling machine 1 must be moved, or else vertically, as illustrated in the figure 1 , when the machine for drilling 1 needs to install a pylon micro-pile.
  • the mast 6 In the drilling position, as shown in figure 1 , the mast 6 has a lower end 6a intended to bear against the surface to be drilled.
  • the drilling machine 1 further comprises a carriage 10 mounted to slide along the mast 6.
  • the carriage 10 can be moved along the mast 6 by means known elsewhere and not shown here.
  • the carriage 10 comprises in particular a rotation table 12 configured to rotate a drive head 14 on which the drilling tool will be mounted.
  • the drilling tool of the present drilling machine 1 comprises on the one hand a drill rod and on the other hand a protection tube independent of the drill rod and surrounding the latter at the level of the upper portion of the borehole.
  • the drive head 14 comprises in particular first mounting means 16, for example an internal thread, configured to allow the mounting of a drill rod 18, comprising a corresponding external thread, on the drive head 14.
  • the head drive 14 also comprises second mounting means 20, for example an external thread, configured to allow the mounting of a protection tube 22, comprising a corresponding thread, on the drive head 14.
  • first mounting means 16 and the second mounting means 20 are arranged coaxially on the drive head 14, in order to obtain a mounting of the drill pipe 18 parallel to the mounting of the protection tube 22 , and include different diameters corresponding to those of drill pipe 18 and shroud 22.
  • drill pipe 18 and shroud 22 are simultaneously driven together by drive head 14 when they are mounted on means 16 and 20 respectively.
  • the drilling machine 1 also comprises a circulation circuit for a drilling fluid.
  • the drilling fluid can for example be water, and is circulated by the drilling machine 1 in the drilling zone in order to extract the drilled material therefrom.
  • the drive head 14 thus comprises a drilling fluid supply channel 24 connected to means for supplying and circulating under pressure a drilling fluid (not shown).
  • Drill pipe 18 also includes an axial channel 26 which comes into fluid communication with supply channel 24 of drive head 14 when drill pipe 18 is mounted on drive head 14. The drilling fluid is thus injected under pressure inside the drill pipe 18, in order to come out at the other end of the drill pipe 18 on which is mounted a cutting tool 28 (see figure 3 ).
  • the shroud tube 22 is designed with an inner diameter greater than the outer diameter of the drill pipe 18, so as to create, when the drill pipe 18 and the shroud pipe 22 are mounted on the drive head 14, an intermediate tubular space 29 extending from the lower end of the protection tube 22 to the first and second mounting means 16, 20 of the drive head 14.
  • the drive head 14 is configured to extend the interposed tubular space 29 beyond the first and second mounting means 16, 20, as far as the first means 30 for recovering drilling fluid.
  • the first recovery means 30 are mounted on the drive head 14, above the first and second mounting means 16, 20, and make it possible to recover, or to suck up thanks to suction means not shown , the drilling fluid charged with drilled material and rising from the bottom of the borehole via the interposed tubular space 29.
  • This recovery, or aspiration, of the drilling fluid loaded with drilled material takes place progressively, and throughout the entire descent of the drill pipe 18 and of the protection tube 22 in the ground, and more particularly in the porous upper layer P of ballast.
  • the drilling machine 1 also comprises second recovery means 32 mounted at the lower end 6a of the mast 6 and configured to recover, or suck up, the drilling fluid loaded with drilled material exiting the tube protection 22 when the latter is positioned through the porous layer P of ballast and is detached from the drive head 14.
  • the drilling machine 1 may comprise suction means (not shown), for example a single pump configured to be connected to the first recovery means 30 and/or to the second recovery means 32 depending on the step of the drilling method.
  • the suction means may comprise a connecting means to be connected to the first recovery means 30 then to the second recovery means 32.
  • the second recovery means 32 may for example comprise a reservoir in the form of a crown mounted around the protection tube 22, and a circular gasket, preferably inflatable, configured to create a seal between the outer wall of the protection tube 22 and the reservoir of the second recovery means 32.
  • the drilling fluid, loaded with drilled material, emerging through the upper end of the protection tube 22 then flows into the reservoir of the second recovery means 32 before being, for example , sucked into a treatment means (not shown) such as a settling tank for separating the drilling fluid and the drilled material and then reusing the drilling fluid.
  • a treatment means such as a settling tank for separating the drilling fluid and the drilled material and then reusing the drilling fluid.
  • step (A) the mast 6 is positioned vertically with its lower end 6a resting on the surface to be drilled.
  • the carriage 10 driving the drive head in translation is positioned at the top of the mast 6, with the drive head 14 located in line with the area to be drilled.
  • step (B) the drive head 14 is pivoted, at the level of the carriage 10, by 90° in order to free access to the zone to be drilled.
  • step (C) the protection tube 22 is positioned above the zone to be drilled, at the lower end 6a of the mast 6 forming a guide for the protection tube 22.
  • step (D) the first portion of the drill rod 18, which has the cutting tool 28 at its end and which constitutes an armature with lost tool, is positioned inside the protective tube 22, as can be seen in the sectional portion shown in step (D).
  • step (E) the drive head 14 is again pivoted, at the level of the carriage 10, by 90° to return to the right of the zone to be drilled, above the protection tube 22 and the rod drilling 18.
  • step (F) the carriage 10 is lowered so as to allow the mounting of the drill pipe 18 on the corresponding first mounting means 16, then the mounting of the protection tube 22 on the corresponding second mounting means 20 .
  • step (G) the drilling fluid is, on the one hand, injected, via the drive head 14, through the drill rod 18 to emerge at the level of the cutting tool 28, then , on the other hand, re-sucked from the upper end of the protection tube 22, via the intermediate tubular space, by the first recovery means 30 mounted on the drive head 14.
  • the drilling fluid having to "raise” the entire length of the protection tube 22 as far as the drive head which may be located very above the surface to be drilled, the injection pressure of the drilling fluid may prove to be insufficient, so that a forced suction at the level of the first recovery means 30 is then necessary.
  • the drilling fluid is recovered as it is injected into the drill pipe 18, which makes it possible to limit the impact of its circulation on the zone surrounding the drilling.
  • step (G) the protective tube 22 is positioned through the porous layer P of ballast, and can then be separated from the drive head 14.
  • the second recovery means 32 can be secured to the protective tube 22, for example the inflatable annular seal can be inflated so as to seal the connection between the protective tube 22 and the reservoir of the second recovery means 32.
  • step (H) the carriage 10 carrying the drive head 14 is first partially raised so as to raise the drill rod 18 sufficiently to be able to separate it in turn from the drive head 14, then the carriage 10 is raised to the top of the mast 6.
  • step (I) the drive head 14 is pivoted, at the level of the carriage 10, by 90° in order to free access to the zone to be drilled, and a second portion of the drill rod 18 is positioned then mounted on the first portion of the drill pipe 18.
  • step (J) the drive head 14 is again pivoted, at the level of the carriage 10, by 90° to return to the right of the zone to be drilled, above the drill rod 18 (which comprises now two portions), and this is then mounted on the drive head 14.
  • step (K) the drill pipe 18 is rotated by the drive head 14 at the same time as the carriage 10 descends along the mast 6. The drill pipe 18 therefore continues to drill the ground S , beyond the lower end of the protection tube 22.
  • the drilling fluid is, on the one hand, injected, via the drive head 14, through the drilling 18 to emerge at the level of the cutting tool 28, then, on the other hand, circulates, via the intermediate tubular space, to the upper end of the protection tube 22.
  • the upper end of the protection 22 being free and located slightly above the drilled surface, the drilling fluid loaded with drilled material can then come out on its own, under the effect of the injection pressure, and flow into the reservoir of the second means recovery 32 to then be sucked by the suction means.
  • the drilling fluid is recovered as it is injected into the drill pipe 18, which makes it possible to limit the impact of its circulation on the zone surrounding the drilling.
  • step (L) the carriage 10 carrying the drive head 14 is first partially raised so as to raise the drill rod 18 sufficiently to be able to separate it from the drive head 14, then the Carriage 10 is completely raised to the top of mast 6 so as to be able to reproduce, as many times as desired, steps (I) to (L).
  • a cement slurry can then be injected into the drill rod in order to seal the latter in the ground S and thus obtain a catenary pylon micro-pile.
  • a micro-pile is obtained formed on the one hand by a drill rod and on the other hand by a protective tube which reinforces the maintenance of the drill rod in the ground.
  • the protection tube is positioned in the ground, through a layer of ballast, without the latter or the surface of the zone to be drilled being impacted by the drilling carried out.
  • the drilling machine 1 is suitable for being installed on a railway wagon and for moving quickly, with significant bends.
  • a works train 34 part of which is illustrated on the figure 5 , comprising a drilling machine 1 as described previously, and making it possible to install the micro-piles of the catenary pylons along the railway line on which it circulates.
  • the work train 34 can thus comprise, in addition to the drilling machine 1, means for supplying and circulating, under pressure, a drilling fluid (not shown), connected to the drive head, means slurry supplies (not shown) configured to be connected to drive head 14 when sealing drill pipe 18 in the borehole.
  • the work train 34 can also comprise suction means 36 for the drilling fluid loaded with drilled material, configured to be connected to the first or to the second recovery means 30, 32, as well as a settling tank 38 mounted downstream of the suction means 36 and making it possible to separate the drilling fluid and the drilled material, in order to allow reuse of the drilling fluid.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Claims (15)

  1. Maschine (1) zum Aufbohren unter Fluidzirkulation eines mit einer porösen Schicht (P), zum Beispiel einer Schotterschicht, bedeckten Bodens (S), wobei die Maschine (1) umfasst:
    - einen Antriebskopf (14) zum drehbaren Antreiben eines Bohrgestänges (18), und
    - Mittel zur Zirkulation eines Bohrfluids, die dazu ausgestaltet sind, ein Bohrfluid durch das Bohrgestänge (18) einzuspritzen,
    wobei die Maschine (1) ferner dazu ausgestaltet ist, durch die poröse Schicht (P) ein Schutzrohr (22) einzuführen, das sich um das Bohrgestänge (18) erstreckt und einen rohrförmigen Zwischenraum (29) zwischen dem Bohrgestänge (18) und dem Schutzrohr (22) lässt, und wobei die Maschine (1) ferner erste Mittel zur Rückgewinnung (30) des Bohrfluids umfasst, die dazu ausgestaltet sind, bei der Einführung des Schutzrohrs (22) durch die poröse Schicht (P) das von dem Bohrgestänge (18) stammende und am unteren Ende des Schutzrohrs (22) vorhandene Bohrfluid ausgehend von dem oberen Ende des Schutzrohrs (22) anzusaugen.
  2. Maschine (1) nach Anspruch 1, wobei die ersten Mittel (30) zur Rückgewinnung des Bohrfluids dazu ausgestaltet sind, bei der Einführung des Schutzrohrs (22) durch die poröse Schicht (P) das von dem Bohrgestänge (18) stammende, am unteren Ende des Schutzrohrs (22) vorhandene und über den rohrförmigen Zwischenraum (29) aufsteigende Bohrfluid ausgehend von dem oberen Ende des Schutzrohrs (22) anzusaugen.
  3. Maschine (1) nach Anspruch 1 oder 2, die ferner zweite Mittel (32) zur Rückgewinnung des Bohrfluids umfasst, wobei die zweiten Rückgewinnungsmittel (32) dazu ausgestaltet sind, das von dem Bohrgestänge (18) stammende und durch das obere Ende des Schutzrohrs (22) austretende Bohrfluid über den rohrförmigen Zwischenraum (29) abzuleiten, wenn das Schutzrohr (22) durch die poröse Schicht (P) positioniert ist.
  4. Maschine (1) nach Anspruch 3, wobei das erste und das zweite Rückgewinnungsmittel (30, 32) eine gemeinsame Pumpe und ein Verbindungsmittel umfassen, das dazu ausgestaltet ist, bei der Einführung des Schutzrohrs (22) durch die poröse Schicht (P) die gemeinsame Pumpe mit den ersten Rückgewinnungsmitteln (30) zu verbinden und die gemeinsame Pumpe mit den zweiten Rückgewinnungsmitteln (32) zu verbinden, wenn das Schutzrohr (22) durch die poröse Schicht (P) positioniert ist.
  5. Maschine nach Anspruch 3 oder 4, wobei die zweiten Rückgewinnungsmittel dazu ausgestaltet sind, an dem oberen Ende des Schutzrohrs positioniert zu sein, wenn das Schutzrohr durch die poröse Schicht positioniert ist, wobei die zweiten Rückgewinnungsmittel einen Behälter, vorzugsweise in der Form eines Kranzes, in den das aus dem Schutzrohr austretende Bohrfluid sich ergießt, und eine, vorzugsweise kreisförmige, Umfangsdichtung umfassen, die eine Dichtung zwischen dem Behälter und der Außenwand des Schutzrohrs erzeugt.
  6. Maschine (1) nach Anspruch 5, wobei die Umfangsdichtung eine aufblasbare Dichtung ist.
  7. Maschine (1) nach einem der Ansprüche 1 bis 6, wobei der Antriebskopf (14) dazu ausgestaltet ist, bei der Einführung des Schutzrohrs (22) durch die poröse Schicht (P) auch das Schutzrohr (22), vorzugsweise gleichzeitig mit dem Bohrkopf (18), drehbar anzutreiben.
  8. Maschine (1) nach Anspruch 7, wobei der Antriebskopf (14) Mittel (16) zur Montage des Bohrgestänges (18), die einen ersten bestimmten Durchmesser aufweisen, und Mittel (20) zur Montage des Schutzrohrs (22) umfasst, die einen zweiten bestimmten Durchmesser aufweisen, der größer als der erste bestimmte Durchmesser ist.
  9. Maschine (1) nach Anspruch 8, wobei die ersten Mittel (30) zur Rückgewinnung des Fluids an dem Antriebskopf (14), zum Beispiel über den Mitteln (20) zur Montage des Schutzrohrs (22), montiert sind.
  10. Bauzug (34), der eine Maschine (1) zum Aufbohren eines mit einer porösen Schicht (P) bedeckten Bodens (S) nach einem der Ansprüche 1 bis 9 umfasst.
  11. Bauzug (34) nach dem vorhergehenden Anspruch, der Mittel zur Zufuhr eines Bohrfluids, die mit dem Antriebskopf (14) verbunden sind, Mittel (36) zum Ansaugen des Bohrfluids, die dazu ausgestaltet sind, mit den Rückgewinnungsmitteln (30, 32) verbunden zu sein, und Mittel zur Bereitstellung eines Zementbreis umfassen, die dazu ausgestaltet sind, mit dem Antriebskopf (14) verbunden zu sein.
  12. Bauzug (34) nach dem vorhergehenden Anspruch, der ferner ein System zur Rückgewinnung der Schlämme, zum Beispiel ein Absetzbecken (38), umfasst, die den Rückgewinnungsmitteln (30, 32) nachgeschaltet montiert sind.
  13. Verfahren zum Anbohren unter Fluidzirkulation eines mit einer porösen Schicht, zum Beispiel einer Schotterschicht, bedeckten Bodens, wobei:
    - ein Bohrgestänge (18) drehbar angetrieben wird, und
    - ein Bohrfluid durch das Bohrgestänge (18), vorzugsweise während der Drehung des Bohrgestänges (18), eingespritzt wird,
    wobei während eines ersten Schritts:
    - durch die poröse Schicht ein Schutzrohr (22) eingeführt wird, das sich um das Bohrgestänge (18) erstreckt und einen rohrförmigen Zwischenraum (29) zwischen dem Bohrgestänge (18) und dem Schutzrohr (22) lässt, und
    - ausgehend von dem oberen Ende des Schutzrohrs (22) das von dem Bohrgestänge (18) stammende, am unteren Ende des Schutzrohrs (22) vorhandene und über den rohrförmigen Zwischenraum (29) aufsteigende Bohrfluid bei der Einführung des Schutzrohrs (22) durch die poröse Schicht angesaugt wird.
  14. Bohrverfahren nach dem vorhergehenden Anspruch, wobei während eines zweiten Schritts, wenn das Schutzrohr (22) durch die poröse Schicht positioniert wird, das Schutzrohr (22) an Ort und Stelle gelassen wird und das von dem Bohrgestänge (218) stammende und durch das obere Ende des Schutzrohrs (22) über den rohrförmigen Zwischenraum (29) austretende Fluid abgeleitet wird.
  15. Verfahren nach Anspruch 14, wobei während des ersten Schritts das Schutzrohr (22) gleichzeitig mit einem ersten Teil des Bohrgestänges, das an seinem Ende mit einem Werkzeug (28) ausgestattet ist, angetrieben wird und dann während des zweiten Schritts ein zweiter Teil des Bohrgestänges mit dem ersten Teil des Bohrgestänges zusammengebaut und die zwei Teile des Bohrgestänges (18) drehbar angetrieben werden und dabei ein Bohrfluid durch das obere Ende des Schutzrohrs (22) eingespritzt wird und das daraus austretende Fluid über den rohrförmigen Zwischenraum (29) abgeleitet wird.
EP20179234.8A 2019-06-21 2020-06-10 Maschine zum aufbohren eines mit einer porösen schicht bedeckten bodens, und entsprechendes verfahren Active EP3754154B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1906753A FR3097588B1 (fr) 2019-06-21 2019-06-21 Machine pour forer un sol recouvert d’une couche poreuse, et procédé correspondant

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EP3754154A1 EP3754154A1 (de) 2020-12-23
EP3754154B1 true EP3754154B1 (de) 2022-08-10

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EP (1) EP3754154B1 (de)
CA (1) CA3083445A1 (de)
FR (1) FR3097588B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2869066B1 (fr) * 2004-04-16 2007-01-05 Technip France Sa Methode et ensemble de forage pour forer des trous de large diametre
FR2998593B1 (fr) * 2012-11-29 2015-01-23 Soletanche Freyssinet Procede de mise en place et de scellement d'un element tubulaire dans un sol sous charge d'eau
FR3026754B1 (fr) * 2014-10-01 2016-12-02 Soletanche Freyssinet Machine et procede pour la realisation de colonnes dans un sol

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Publication number Publication date
EP3754154A1 (de) 2020-12-23
FR3097588B1 (fr) 2022-03-18
FR3097588A1 (fr) 2020-12-25
CA3083445A1 (fr) 2020-12-21

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