EP3205775B1 - Bohrverfahren - Google Patents

Bohrverfahren Download PDF

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Publication number
EP3205775B1
EP3205775B1 EP17155661.6A EP17155661A EP3205775B1 EP 3205775 B1 EP3205775 B1 EP 3205775B1 EP 17155661 A EP17155661 A EP 17155661A EP 3205775 B1 EP3205775 B1 EP 3205775B1
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EP
European Patent Office
Prior art keywords
borehole
sealing
sealing device
reinforcement
tubular wall
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EP17155661.6A
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English (en)
French (fr)
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EP3205775A1 (de
Inventor
Stéphane Binon
Pascal BOULADE
Christophe Guillon
Basile LECONTE
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Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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Publication of EP3205775A1 publication Critical patent/EP3205775A1/de
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Publication of EP3205775B1 publication Critical patent/EP3205775B1/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/66—Mould-pipes or other moulds
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/22—Placing by screwing down

Definitions

  • the present invention relates to the realization of foundations in construction works, as known from document EP 2295645 A , and more specifically a method of producing a foundation element, as well as a method and a device for sealing a borehole intended to be used in the production of such a foundation element.
  • micropile foundations In the field of building and public works, there are, among the different types of foundations, so-called micropile foundations.
  • a micropile is a pile with a diameter less than 300 mm, therefore with a small section compared to its length, and whose friction with the surrounding soil offers a significantly greater contribution to the anchoring of the pile than the point effect corresponding to the vertical support of the foundation on the ground.
  • the micropile when the micropile is injected, its production comprises two distinct steps of introducing cement slurry into a borehole: a first step in which a first cement slurry is poured to form a sheath around a reinforcement in the borehole, and a second pressure injection step in which a second cement slurry is injected under pressure deep into the borehole so as to penetrate radially, through the sheath, into the surrounding soil in order to ensure good anchoring in the soil .
  • the purpose of the sheath is to seal the borehole in its longitudinal axis to prevent the grout then injected under pressure from splashing back to the surface. Consequently, before the pressure injection step, the first grout is typically allowed to set for several hours so that it closes the borehole.
  • the first grout and the second grout can have substantially the same composition, typically with a weight ratio of two parts cement per part water.
  • the present invention aims to remedy this drawback. More specifically, this disclosure aims to propose a method of sealing a borehole in a ground which makes it possible to reduce the time for producing a foundation element by eliminating the waiting time between the pouring of a first grout and injection of a second pressure grout into the borehole.
  • this object is achieved through the use, in this sealing method, of a sealing device comprising a tubular wall, a helical blade and a cap, the tubular wall being axisymmetric around a central axis, and extending along said central axis, from an upper end to an open lower end, the helical blade projecting radially with respect to an outer face of the tubular wall, and the cap closing the 'upper end of the tubular wall, said cap comprising at least one fluid supply connection for the injection of grout under pressure under the cap and a mechanical coupling member suitable for driving the shutter device in rotation around of said central axis.
  • the shutter is placed on an upper end of the borehole and rotated in a first direction around the central axis so that the helical blade cuts into the ground around the borehole, thereby driving the shutter into the land around the borehole.
  • the helical blade serves not only to facilitate the insertion of the shutter device into the ground by rotation around its central axis and then to ensure its anchoring in the ground, then its withdrawal by rotation in the opposite direction, but also, during the grout injection under pressure, helps prevent the grout from rising through the surrounding soil.
  • an effective sealing of the surface borehole is obtained, making it possible to proceed with the injection of cement grout under pressure. without having to wait for the setting of a first grout forming a sheath, which simplifies and makes faster the production of foundation elements.
  • the tubular wall may in particular be cylindrical to facilitate its insertion into a borehole of substantially equal or slightly greater diameter.
  • the tubular wall may have an outer diameter which increases towards its upper end, so as to contribute to the compaction of the ground by radial displacement of the ground during the driving of the sealing device into the ground.
  • the mechanical coupling member may also be suitable for driving said closure device in the direction of said central axis.
  • the driving of the closure device into the ground, and / or its subsequent extraction, may be assisted by an axial force exerted through the mechanical coupling member.
  • the number of helical blades is not limited to one.
  • the closure device can also include at least one additional helical blade projecting radially from the outer face of the tubular wall.
  • the cap may include at least one fluid supply connection and one fluid discharge opening, and further comprising, under the cap , a first cavity, in fluid communication with said supply connection, and a second cavity, separate from the first cavity and in fluid communication with said fluid discharge opening.
  • a maximum outside diameter of the tubular wall of the closure device may be equal to or less than an inside diameter of the borehole, so as to facilitate the sinking of the hole. shutter device.
  • an outside diameter of the lower end of the tubular wall of the sealing device may be equal to or less than an inside diameter of the borehole, but a maximum outside diameter of the tubular wall of the sealing device may be greater than the inside diameter of the borehole, and the outside face of the tubular wall thus exerts radial pressure on the ground when the closure device is driven into the ground, so as to compact the ground around the borehole, this which is favorable to the good sealing of the borehole.
  • the present disclosure also relates to a method for producing a foundation element, comprising at least one step of sealing a borehole in a field according to the aforementioned method, a step of injection into the borehole, through the connection d. supply of a pressurized cement slurry, and a step of removing the closure device, after the injection step, by rotating the closure device in the direction opposite to said first direction of rotation.
  • the production method may also include, before the step of sealing the borehole, a step of installing a reinforcement in the borehole.
  • the production method may also comprise, before the step of injecting a pressurized cement grout, a step of casting a first grout of cement in the borehole.
  • This step of pouring a first cement slurry in the borehole can in particular be carried out after the step of installing the reinforcement, although the alternative is also possible.
  • the latter may comprise a conduit, and the first cement slurry may be poured into the borehole through said conduit.
  • this duct can for example comprise at least one valve.
  • the frame may in particular be tubular, so that its interior forms this duct.
  • the reinforcement in order to prevent the grout from returning to the duct, may include at least one radial passage between said duct and an outer surface of the frame, and an elastic sleeve preventing the passage of fluid, through said radial passage, from the outside towards said duct, while allowing the passage of fluid, through said radial passage, in the opposite way.
  • the step of pouring a first cement slurry into the borehole can be carried out before the step of sealing the borehole.
  • this first grout could simply be poured by gravity into the borehole, before, during or after the installation of the reinforcement.
  • the step of pouring a first cement slurry in the borehole is carried out after the step of sealing the borehole, through a first cavity, under the cap of the borehole.
  • closure device connecting the supply connection of the closure device to the conduit in the armature, while a rising fluid escapes from the borehole through a second cavity, separated from the first cavity under the cap of the device sealing and connecting the borehole to a fluid discharge opening in the cap of the sealing device.
  • the reinforcement can in particular be self-drilling and the drilling thus be carried out simultaneously with the installation of the reinforcement.
  • the reinforcement can be coated with a non-stick coating over part of its length before its installation in the borehole, so as to restrict the adhesion of the cement after setting to a single segment of the reinforcement, for example to its segment. deeper.
  • the figure 1 illustrates a closure device 1 according to a first embodiment, together with a tubular frame 10.
  • the illustrated closure device 1 comprises a tubular wall 2, two helical blades 6a, 6b and a cap 3.
  • the tubular wall 2 is axisymmetric around a central axis Z and extends, along this central axis Z, from an upper end 2a closed by the cover 3 to an open lower end 2b.
  • the cover 3 comprises a connection 4 for supplying fluid for the injection of pressurized grout under the cover 3 and a mechanical coupling member 5 suitable for driving the closure device 1 in rotation about said central axis Z, as well as axially in the direction of the central axis Z.
  • this mechanical coupling member 5 has a bore with a polygonal section for torque transmission, and transverse orifices for the insertion of an ankle (not shown) for the transmission of forces in the direction of the central axis Z.
  • this mechanical coupling member can take alternative forms such as example that of a tapping.
  • a first helical blade 6a extends over practically the entire height of the tubular wall 2, from its lower end 2b to its upper end 2a.
  • the additional helical blade 6b which is interposed between the turns of the first helical blade 6a and has the same screw pitch, extends only over a lower part of the height of the tubular wall 2 from its lower end 2b .
  • the tubular wall 2 is cylindrical and therefore has substantially the same outer diameter over its entire height, so as to facilitate its insertion into a borehole with an inner diameter substantially equal to or slightly greater than the outer diameter of this tubular wall.
  • this tubular wall 2 may have an outer diameter which increases towards its upper end 2a, thus forming a discharge auger with an outer diameter d2 of the lower end 2b of the tubular wall 2 less than a maximum outer diameter d1 of the tubular wall 2.
  • this closure device 1 will be used for drilling with an internal diameter substantially equal to or slightly greater than the external diameter d2 of the lower end 2b of the tubular wall 2 but less than the maximum external diameter d1 of the wall.
  • the outer face of the tubular wall 2 can exert radial pressure on the ground when the closure device 1 'is driven into the ground, possibly serving to consolidate the ground around the borehole.
  • the rest of the elements of this closure device 1 ' are similar to those of the closure device 1 according to the first embodiment and therefore receive the same reference numbers.
  • the closure devices 1,1 ′ can in particular be arranged on the upper end of a tubular frame 10 in a borehole, in particular concentrically with the latter.
  • the frame 10 illustrated is a tubular frame defining a duct 12 therein, other forms of frame having one or more ducts for the injection of cement slurry may be considered.
  • the duct 12 of the tubular frame 10 can have at least one valve 13.
  • the tubular frame 10 can include at least one radial passage 14 between the duct 12 and an outer surface of the frame 10, and at least one resilient cuff 15 preventing the passage of fluid, through said radial passage 14, from the outside towards the conduit 12, while allowing the passage of fluid, through said said radial passage.
  • the connection 4 for supplying fluid to each of the closure devices 1, 1 ′ can be arranged so as to be placed directly in communication with this conduit 12 when the closure device 1.1 ′ is in place.
  • the closure device 1 in a method for producing a foundation element, in particular of the so-called “micropile” type, can be described with reference to figures 4 to 9 .
  • the drilling 30 is carried out in the ground 20.
  • a self-drilling frame 10 actuated by a drilling machine 100 at the surface, so as to combine the realization of the drilling 30 with the installation. of the reinforcement 10 in the borehole 30, as illustrated in figure 4 .
  • this reinforcement can be coated, on an upper segment, with a non-stick coating, for example bituminous, so that the adhesion of a cement grout around the reinforcement 10 is limited to the segments of the non-stick reinforcement. coated with this non-stick coating.
  • a first cement slurry is poured into the borehole 30, so as to fill the borehole 30 around the frame 10, as illustrated on the figure 5 .
  • a self-drilling reinforcement 10 it is also conceivable to carry out this casting before the introduction of the reinforcement 10 in the borehole. drilling 30, rather than after.
  • the closure device 1, held by the drilling machine 100 can be placed on the borehole 30, as illustrated in FIG. figure 6 .
  • the outside diameter of the tubular wall 2 of this closure device 1 is substantially equal to or slightly less than the inside diameter of the borehole 30, so that the tubular wall 2 can be received in the borehole 30.
  • the outer diameter of the tubular wall 2 may be 269.50 mm.
  • the external diameter of the helical blades 6a, 6b is appreciably greater than the internal diameter of the borehole 30, so that these helical blades 6a, 6b can cut in the ground 20 and then retain the closure device 1 against a pressure grout injection.
  • the helical blades 6a, 6b can be projecting by, for example, 50 mm from on the outer surface of the tubular wall 2.
  • the closure device 1 With the drilling machine 100, the closure device 1 can be placed on the ground 20 and actuated in rotation through the mechanical coupling member 5 as illustrated in figure figure 7 , so as to push it into the borehole 30, with the helical blades 6a, 6b therefore cutting in the ground 20 so as to force the closure device 1 downwards. This can be further assisted by a vertical force transmitted to the closure device 1 by the drilling machine 100 through the mechanical coupling member 5.
  • the fluid supply connector 4 can be connected to a cement slurry pump in order to proceed immediately to the injection of a second pressurized cement slurry into the borehole 30, injection intended to penetrate the cement slurry into the ground 20 surrounding the borehole 30 at depth, as illustrated in figure 8 , so as to ensure a good anchoring of the resulting foundation element in this terrain.
  • This injection can be maintained continuously or intermittently for a predetermined period, until the flow rate of cement slurry injected under a predetermined pressure falls below a predetermined threshold, or until the pressure reaches a level.
  • the first cement slurry and the second cement slurry can have substantially the same composition, with a cement-water ratio of, for example, 2, that is, two parts cement (by weight) for each part of water.
  • the foundation element thus obtained can still be the subject of other operations, such as in particular an operation of leveling or cutting of the reinforcement to the desired height.
  • the frame could have been positioned and maintained at the desired height during the setting time, so as to avoid such a subsequent cut.
  • a closure device 1 according to a third embodiment, illustrated in figure 10 , the cap 3 has, apart from the supply connector 4, an opening 8 for discharging fluid, and an annular wall 11 divides the volume under the cover 3 into a first cavity 9a, in fluid communication with the supply connection 4, and a second cavity 9b, separated from the first cavity 9a by the annular wall 11 and in fluid communication with the fluid discharge opening 8.
  • the other elements of this closure device 1 are similar to those of the first two embodiments and therefore receive the same reference numerals. Thanks to the opening 8 for discharging fluid, the borehole 30 can be closed with this. closure device 1 "directly after the drilling 30 has been completed and the reinforcement 10 has been put in place, as illustrated in figure 10 .
  • the making of the borehole 30 and the placement of the frame 10 may have been combined in a single operation with a self-drilling frame 10, as illustrated in figure figure 4 , or alternatively have been carried out as two distinct and successive steps.
  • the closure device 1 is placed on the ground 20 and actuated in rotation through the mechanical coupling member, so as to push it into the borehole 30, with the helical blades 6a, 6b therefore cutting into the ground 20 so as to force the closure device 1 "downwards.
  • This can also be assisted by a vertical force transmitted to the closure device 1 "by the drilling machine 100 through the mechanical coupling member 5.
  • the fluid supply connector 4 can be connected to a grout supply duct for the pouring of a first cement grout in the borehole 30 through the supply connector 4, the first cavity 9a under the cover 3 and the duct 12 of the frame 10, as illustrated in figure 12 .
  • This first grout then displaces the drilling fluid from the borehole 30, this drilling fluid rises and is discharged through the second cavity 9b and the fluid discharge opening 8.
  • this opening 8 fluid discharge is connected to a discharge conduit, it is also possible that it opens directly to the outside during this discharge.
  • the foundation element thus obtained can still be the subject of other operations, such as in particular a leveling operation at the desired height.
  • the composition of the two cement slurries may in fact be identical.
  • the grout can have a cement / water ratio of 2.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Piles And Underground Anchors (AREA)

Claims (20)

  1. Verfahren zum Verschließen eines Bohrlochs (30) in einem Boden (20) unter Verwendung einer Verschlussvorrichtung (1, 1", 1"), umfassend:
    eine rohrförmige Wand (2), die um eine Mittelachse (Z) achsensymmetrisch ist, wobei sich die rohrförmige Wand (2) entlang der Mittelachse (Z) von einem oberen Ende (2a) zu einem offenen unteren Ende (2b) erstreckt,
    eine spiralförmige Klinge (6a), die gegenüber einer Außenseite der rohrförmigen Wand (2) radial vorspringt, und
    eine Kappe (3), die das obere Ende (2a) der rohrförmigen Wand (2) verschließt, wobei die Kappe (3) wenigstens einen Fluidzuführanschluss (4) zum Einspritzen von unter Druck stehendem Brei unter die Kappe (3) und ein mechanisches Kupplungsorgan (5) umfasst, das zum Drehantreiben der Verschlussvorrichtung (1, 1', 1") um die Mittelachse (Z) geeignet ist, und
    bei welchem Verschlussverfahren die Verschlussvorrichtung (1, 1', 1") an einem oberen Ende des Bohrlochs (30) angeordnet und in einer ersten Richtung um die Mittelachse (Z) herum derart in Rotation versetzt wird, dass die spiralförmige Klinge (6a) um das Bohrloch (30) in den Boden schneidet, wodurch die Verschlussvorrichtung (1, 1', 1") um das Bohrloch (30) herum in den Boden (20) getrieben wird.
  2. Verschlussverfahren nach Anspruch 1, bei dem die rohrförmige Wand (2) zylindrisch ist.
  3. Verschlussverfahren nach einem der Ansprüche 1 oder 2, bei dem die rohrförmige Wand (2) einen Außendurchmesser aufweist, der in Richtung ihres oberen Endes (2a) zunimmt.
  4. Verschlussverfahren nach einem der vorhergehenden Ansprüche, bei dem das mechanische Kupplungsorgan (5) auch zum Antreiben der Verschlussvorrichtung (1, 1', 1") in der Richtung der Mittelachse (Z) geeignet ist.
  5. Verschlussverfahren nach einem der vorhergehenden Ansprüche, bei dem die Verschlussvorrichtung (1, 1', 1") wenigstens eine zusätzliche spiralförmige Klinge (6b) umfasst, die gegenüber der Außenseite der rohrförmigen Wand (2) radial vorspringt.
  6. Verschlussverfahren nach einem der vorhergehenden Ansprüche, bei dem die Kappe (3) wenigstens einen Anschluss (4) zum Zuführen von Fluid sowie eine Öffnung (8) zum Abführen von Fluid umfasst und ferner unter der Kappe (3) einen ersten Hohlraum (9a), welcher mit dem Zuführanschluss (4) in Fluidverbindung steht, sowie einen zweiten Hohlraum (9b) umfasst, der von dem ersten Hohlraum (9a) getrennt ist und mit der Öffnung (8) zum Abführen von Fluid in Fluidverbindung steht.
  7. Verschlussverfahren nach einem der vorhergehenden Ansprüche, bei dem ein maximaler Außendurchmesser der rohrförmigen Wand (2) der Verschlussvorrichtung (1, 1") gleich einem oder kleiner als ein Innendurchmesser des Bohrlochs (30) ist.
  8. Verschlussverfahren nach einem der vorhergehenden Ansprüche, bei dem ein Außendurchmesser (d2) des unteren Endes (2b) der rohrförmigen Wand (2) der Verschlussvorrichtung (1') gleich einem oder kleiner als ein Innendurchmesser des Bohrlochs (30) ist, aber ein maximaler Außendurchmesser (d1) der rohrförmigen Wand (2) der Verschlussvorrichtung (1') größer als der Innendurchmesser des Bohrlochs (30) ist, und die Außenseite der rohrförmigen Wand (2) während des Eintreibens der Verschlussvorrichtung (1') in den Boden (20) einen radialen Druck auf den Boden (20) ausübt.
  9. Verfahren zur Herstellung eines Fundamentelements, das wenigstens die folgenden Schritte umfasst:
    Verschließen eines Bohrlochs (30) in einem Boden nach dem Verfahren von einem der Ansprüche 1 bis 8,
    Einspritzen eines unter Druck stehenden Zementbreis durch den Zuführanschluss (4) in das Bohrloch (30), und
    Herausziehen der Verschlussvorrichtung (1, 1', 1") nach dem Einspritzschritt durch Drehen der Verschlussvorrichtung (1, 1', 1") in der zu der ersten Drehrichtung entgegengesetzten Richtung.
  10. Verfahren zur Herstellung eines Fundamentelements nach Anspruch 9, umfassend auch vor dem Schritt des Verschließens des Bohrlochs (30) einen Schritt des Anbringens einer Armierung (10) in dem Bohrloch (30).
  11. Verfahren zur Herstellung eines Fundamentelements nach Anspruch 10, umfassend auch vor dem Schritt des Einspritzens eines unter Druck stehenden Zementbreis einen Schritt des Gießens eines ersten Zementbreis in das Bohrloch (30).
  12. Verfahren zur Herstellung eines Fundamentelements nach Anspruch 11, bei dem der Schritt des Gießens eines ersten Zementbreis in das Bohrloch (30) nach dem Schritt des Anbringens der Armierung (10) durchgeführt wird.
  13. Verfahren zur Herstellung eines Fundamentelements nach Anspruch 12, bei dem die Armierung (10) eine Leitung (12) umfasst und der erste Zementbrei durch die Leitung (12) in das Bohrloch (30) gegossen wird.
  14. Verfahren zur Herstellung eines Fundamentelements nach Anspruch 13, bei dem die Leitung (12) wenigstens eine Klappe (13) umfasst.
  15. Verfahren zur Herstellung eines Fundamentelements nach einem der Ansprüche 13 oder 14, bei dem die Armierung (10) rohrförmig ist.
  16. Verfahren zur Herstellung eines Fundamentelements nach Anspruch 15, bei dem die Armierung (10) wenigstens einen radialen Durchgang (14) zwischen der Leitung und einer Außenfläche der Armierung (10) umfasst, und wobei eine elastische Manschette (15) den Durchtritt von Fluid durch den radialen Durchgang (14) von der Außenseite in Richtung der Leitung (12) verhindert und gleichzeitig den Durchtritt von Fluid durch den radialen Durchgang (14) in entgegengesetzter Richtung ermöglicht.
  17. Verfahren zur Herstellung eines Fundamentelements nach einem der Ansprüche 12 bis 16, bei dem der Schritt des Gießens eines ersten Zementbreis in das Bohrloch (30) vor dem Schritt des Verschließens des Bohrlochs (30) durchgeführt wird.
  18. Verfahren zur Herstellung eines Fundamentelements nach einem der Ansprüche 13 bis 16, bei dem der Schritt des Gießens eines ersten Zementbreis in das Bohrloch (30) nach dem Schritt des Verschließens des Bohrlochs (30) durch einen ersten Hohlraum (9a) unter der Kappe (3) der Verschlussvorrichtung (1"), welcher den Zuführanschluss (4) der Verschlussvorrichtung (1") mit der Leitung in der Armierung (10) verbindet, durchgeführt wird, während ein wieder aufsteigendes Fluid aus dem Bohrloch (30) durch einen zweiten Hohlraum (9b) entweicht, welcher von dem ersten Hohlraum unter der Kappe (3) der Verschlussvorrichtung (1") getrennt ist und das Bohrloch (30) mit einer Öffnung (8) zum Fluidabführen in der Kappe (3) der Verschlussvorrichtung (1) verbindet.
  19. Verfahren zur Herstellung eines Fundamentelements nach einem der Ansprüche 10 bis 18, bei dem die Armierung (10) selbstbohrend ist und das Bohrloch (30) gleichzeitig mit dem Anbringen der Armierung (10) hergestellt wird.
  20. Verfahren zur Herstellung eines Fundamentelements nach einem der Ansprüche 10 bis 19, bei dem die Armierung (10) vor ihrem Anbringen in dem Bohrloch (30) über einen Teil ihrer Länge mit einer Antihaftbeschichtung überzogen wird.
EP17155661.6A 2016-02-10 2017-02-10 Bohrverfahren Active EP3205775B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1651074A FR3047511B1 (fr) 2016-02-10 2016-02-10 Dispositif et procede d'obturation de forage

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EP3205775B1 true EP3205775B1 (de) 2020-12-30

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905462A1 (de) * 1989-02-22 1990-08-23 Bauer Spezialtiefbau Verfahren und messvorrichtung zur ermittlung des betonierdruckes
DE4228580C1 (de) * 1992-09-01 1993-10-28 Strabag Bau Ag Erdbohrer zum Herstellen eines Ortbeton-Verdrängungspfahles
EP2156907A1 (de) * 2008-08-20 2010-02-24 Soletanche Freyssinet Einrichtung zur Bodensanierung
EP2295645A1 (de) * 2009-08-28 2011-03-16 BAUER Maschinen GmbH Bohrgerät und Verfahren zur Bohrpfahlherstellung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905462A1 (de) * 1989-02-22 1990-08-23 Bauer Spezialtiefbau Verfahren und messvorrichtung zur ermittlung des betonierdruckes
DE4228580C1 (de) * 1992-09-01 1993-10-28 Strabag Bau Ag Erdbohrer zum Herstellen eines Ortbeton-Verdrängungspfahles
EP2156907A1 (de) * 2008-08-20 2010-02-24 Soletanche Freyssinet Einrichtung zur Bodensanierung
EP2295645A1 (de) * 2009-08-28 2011-03-16 BAUER Maschinen GmbH Bohrgerät und Verfahren zur Bohrpfahlherstellung

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EP3205775A1 (de) 2017-08-16
FR3047511A1 (fr) 2017-08-11

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