EP0517329B1 - Hollow auger for casting piles in situ, and drilling device including at least two such augers - Google Patents

Hollow auger for casting piles in situ, and drilling device including at least two such augers Download PDF

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Publication number
EP0517329B1
EP0517329B1 EP19920201589 EP92201589A EP0517329B1 EP 0517329 B1 EP0517329 B1 EP 0517329B1 EP 19920201589 EP19920201589 EP 19920201589 EP 92201589 A EP92201589 A EP 92201589A EP 0517329 B1 EP0517329 B1 EP 0517329B1
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EP
European Patent Office
Prior art keywords
tube
central
supporting tube
injection
designed
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EP19920201589
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German (de)
French (fr)
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EP0517329A1 (en
Inventor
Jean-Marie Labrue
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • 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
    • E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes 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
    • E02D5/22—Piles
    • E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/06—Measuring temperature or pressure

Definitions

  • the invention relates to a hollow auger for making piles molded into the ground, by injection of a filling product such as concrete. It extends to a drilling device comprising at least two of these augers and intended for the manufacture of walls by contiguous piles.
  • the first type described in particular in patents GB 2,210,919 and EP 378,348, consists of a hollow support tube comprising a longitudinal external blade, inside which the concrete is injected once the well has been made.
  • the second type described in particular in patent FR 2,318,275, comprises a hollow support tube carrying a longitudinal external blade, and a central injection tube extending into this tube and secured to the latter, inside which is injected concrete, according to the preamble of claim 1.
  • a second consequence relates to a relative ineffectiveness of the injection pressure control system to which the ascent members are controlled, and this regardless of the solution proposed, namely control at the head of the auger (FR 2.318.275) or at the base of the auger (GB 2.210.919).
  • the present invention proposes to overcome the drawbacks of the augers described above and has as a first objective to provide an auger provided with a central injection tube requiring no member, such as swivel connector ..., for the connection of the latter, and to provide an auger with a reliable and efficient injection pressure control system.
  • a secondary objective is to provide an auger with shutter valves actuated automatically in a very simple manner before the ascent phase of said auger.
  • Another object of the invention is to provide a drilling device for the production of contiguous piles, made from augers according to said invention.
  • the auger according to the invention therefore comprises a central injection tube which can be connected in a very simple way to the concrete supply pipe, without the interposition of a rotary connector or other member aiming at the same function.
  • the measurement means make it possible to have, at the control station, measurement readings faithfully representing the injection pressure at the base of the auger, and allow control of the ascent members taking into account the height of concrete in the central injection tube, the presence of accidental out-profiles ...
  • the design of the auger according to the invention also makes it possible, in a simple manner, to produce a drilling device for the manufacture of walls by contiguous piles.
  • this drilling device comprises at least two augers each provided with means for measuring the pressure of injected concrete, and comprising individual rotation drive means adapted to drive them in reverse rotation with respect to each other , and common translational drive means, said augers being aligned with their main blades in tangential position, and each comprising means for regulating the flow rate of filling product capable of standardizing the injection pressures of said product.
  • the rotation drive means consist of a rotation table comprising a fixed part in rotation secured to the translation drive means of the support tube, and a part mobile in rotation carrying said support tube, the means for holding the central injection tube are secured to the stationary part in rotation of the rotation table.
  • valves thus form a shutter belt aimed at preventing the rise of the concrete between two successive blades.
  • At least two valves of two adjacent augers preferably have complementary shapes adapted so that, for a position vis-à-vis said valves, the latter comprise a covering portion the point of tangency of the main blades of said augers.
  • the outer grip of the surface of the valves, after folding, extends beyond the size of the auger blades, and for a suitable orientation thereof, there is an overlap of the point of tangency of the blades of the two adjacent augers.
  • This arrangement ensures continuity of the molded concrete panel, even if the augers are not completely joined as is the case with certain materials.
  • the fixed part of the rotation table consists of two elements secured by pivoting means capable of allowing relative rotation of said elements relative to each other: a first element secured to the drive means in translation of said rotation table, and a second element carrying the mobile part in rotation of this rotation table, the pivoting means being adapted to allow rotation of said second element between a working position where the tube support extends substantially vertically, and a mounting position where this support tube extends substantially horizontally.
  • This feature makes it possible to arrange the rotation table with its horizontal axis of rotation with a view, firstly, of nesting into each other the successive sections of the support tube, then, secondly, of threading into this support tube, the central injection tube.
  • connection means of the measurement means of which have only a minimum of connections.
  • the hollow auger shown in Figures 1 to 8 and the drilling device shown in Figures 9 and 10 are intended for the production of molded piles and walls respectively by adjoining piles, by concrete injection.
  • the hollow auger comprises, in a conventional manner, a mast 1 along which slides a hydraulic rotation table 2 comprising a head 3 for coupling with a support tube 4, and hydraulic winches such as 5 ensuring by the intermediate cables such as 6 and pulleys such as 7, the displacements in vertical translation of the rotation table 2.
  • the rotation table 2 comprises, in the first place, a fixed part in rotation which decomposes into two elements 2a, 2b secured by means of pivoting means able to allow relative rotation of said elements with respect to each other .
  • the first of these elements 2a consists of a carriage arranged to slide along the mast 1 and comprising two slides 8 adapted to cooperate with two vertical guide rails 9 extending laterally on either side of this mast 1.
  • the second element 2b of this fixed part in rotation carries the motor for driving in rotation of the support tube 4, adapted to drive in rotation the coupling head 3 under which said support tube is fixed.
  • the pivoting means connecting these two elements may consist, for example, of a hinge pin 2c disposed between said elements in the upper part of the latter, locking means, of any type known per se, being arranged in the lower part of the elements.
  • These pivoting means are adapted to cause rotation of the second element 2b around the articulation axis 2c, between a working position where the axis of the coupling head 3 extends vertically, and a mounting position where this axis extends horizontally.
  • the support tube 4 comprises a main blade 10 extending in the form of a helix along said support tube, and ending with a leading edge 10a at the lower end of this tube.
  • This tube 4 also includes two complementary blades 11, 12 extending from the lower end of this support tube and each ending in a leading edge 11a, 12a. These two complementary blades 11, 12 define a portion of turn extending over 120 ° and are offset relative to the main blade 10 so that said complementary and main blades are regularly distributed around the axis of the support tube 4.
  • the support tube 4 further comprises a cutting head 13 arranged in the extension of the lower end of said tube.
  • This cutting head 13 consists of three radial branches 13a, 13b, 13c regularly distributed around the axis of the support tube 4 so as to come radially each in alignment with the leading edge 10a, 11a, 12a of a blade 10, 11.12.
  • Each of these branches 13a-13c has a triangular shape extended in the upper part by a lug such as 14 arranged to come to fit in a groove formed laterally at the leading edge 10a, 11a, 12a of each blade 10-12 .
  • the hollow auger also has a central injection tube 15 placed inside the support tube 4 with which it defines an annular volume 16.
  • This central injection tube 15 extends inside the support tube 4 and the coupling head 3 of the rotation table 2, and is extended above this rotation table by a swan neck 17 intended for be conventionally connected to a concrete pump (not shown).
  • the central injection tube comprises a sealing piston 18 integral with said tube and adapted to close off the annular volume 16.
  • centering bearings such as 19 integral with the central injection tube 15 are arranged in the annular volume 16 and distributed over the length of this central injection tube. These centering bearings 19, on the one hand, allow the central tube 15 to be held concentrically with respect to the support tube 4, and on the other hand, allow this support tube 4 to rotate around said central tube.
  • the means for holding the central injection tube 15 are adapted to block the latter in rotation and to allow a simultaneous translation movement of said central tube and of the support tube 4, with however a possibility of axial displacement over a short length. of the central tube relative to the support tube.
  • These holding means comprise at least one jack such as 20 arranged vertically and secured respectively to the central tube 15 and to the rotation table 2, so as to cause, during its actuation, an axial displacement of said central tube relative to the rotation table 2 and therefore relative to the support tube 4.
  • the jacks 20 are two in number arranged on either side of the central tube 15, and secured respectively on the upper face of the rotation table 2 and under two plates such as 21 fixed on the neck of swan 17, towards the top of the latter's elbow, so as to extend horizontally on either side thereof.
  • the cylinders 20 are adapted to move the central injection tube 15 between a low position where the lower end of the latter and the sealing piston are in contact with the cutting head 13, and a high position where the end bottom of the tube and the piston are spaced from said cutting head.
  • the hollow auger further comprises means for measuring the concrete pressure at the base of the support tube 4.
  • these measuring means are arranged inside the sealing piston 18 and comprise an annular chamber filled with fluid, communicating with the internal volume of the central tube 15 by the through an opening closed by a membrane capable of being deformed during the injection of concrete.
  • the lower end of the central injection tube 15 has a conical surface 15a, and this central tube comprises, at a distance above this end, an external annular base 23 provided with a threaded edge .
  • the piston 18 is itself made up of two coaxial tubes 24, 25 delimiting an annular volume 26, connected at their lower end by an annular base 27 closing said volume.
  • the outer tube 24 of this piston has an outer diameter combined with the inner diameter of the support tube 4, and has a tapped upper end internally allowing it to be screwed onto the base 23 of the central injection tube 15.
  • the inner tube 25 has, for its part, an internal diameter combined with the internal diameter of the central injection tube 15. It also has a length less than that of the external tube 24 so that its upper end is at a distance from the lower end 15a of the central injection tube 15. In addition, the upper end of this inner tube has a conical surface 25a.
  • the membrane 28 is arranged in the space separating the ends 15a, 25a of the central injection tube 15 and of the internal tube 25 of the piston. It is held in this space by means of an annular part 29 having a U-shaped section whose branches, such as 29a, are inclined so as to define conical bearing surfaces combined with those of the central injection tube 15 and the inner tube 25 of the piston.
  • the membrane 28 is therefore pinched between this annular part 29 and the central injection tube 15, on the one hand, and the piston 18 on the other hand.
  • the annular part 29 is, moreover, pierced with orifices 30 for communication with the main volume 26 of the piston.
  • the upper base 23 is pierced with a threaded bore 23a adapted to allow the installation of a sensor 31 with piezoelectric element connected to the control station by an electric wire 31a extending in the annular volume 16 auger.
  • the measuring means comprise a disc 32 disposed around the lower end of the central injection tube 15 and mounted to slide along said tube. so as to define with the piston 18 an annular chamber 33 of variable volume.
  • a lower stop 34 made up of an external annular rim secured to the end of the central injection tube 15 also prevents disengagement of the disc 32.
  • This disc has an external diameter combined with the internal diameter of the support tube 4 and comprises two annular grooves in which seals 35, 36 are housed with the support tube 4 and the central injection tube 15.
  • the piston consists of a cylinder 37 pierced with a longitudinal bore 38 adapted to open into the annular chamber 33 and allowing the latter to be connected to a pipe 39 for supplying oil.
  • the operating principle of these measurement means is as follows: during the drilling phase, the piston 37 and the disc 32 are in contact or, at least, close to each other. At the end of drilling, the central injection tube 15 is moved upwards creating the annular chamber 33 between the piston 37 and the disc 32. This chamber 33 is then filled with a volume of oil, during the raising of the support tube 4, the pressure of the concrete is applied to the disc 32, causing compression of the oil contained in the annular chamber 33. The corresponding pressure is directly delivered to the control station by means of line 39.
  • the hollow auger comprises three valves 40, 41, 42 each associated with a blade 10, 11, 12 and intended to form an external closure belt at the base of the support tube 4 during the ascent thereof.
  • valves 40-42 have a helical shape and a length combined with those of the complementary blades 11, 12 adapted to allow them to be pressed each under a blade.
  • valves 40-42 are carried by articulation pins such as 43 pivotally mounted on the support tube 4, and passing through the wall of the latter so as to open into an annular groove 44 formed on the external face of the sealing piston 18.
  • the piston 18 is provided, on either side of this groove 44, with two annular grooves housing a seal 46, 47 for sealing with the wall of the support tube 4.
  • the rotation table 2 is arranged so that the coupling head 3 extends horizontally.
  • the support tube 4 can be made easily, from sections of tubes lying on the ground which are fitted, for the first on the coupling head 4, then successively the to each other.
  • the central injection tube 15 can then be introduced into the support tube in one piece, the electric cable 31a (or the pipe 39) being preassembled on the latter without (or with a minimum of) fittings.
  • a pile is made as follows: In the drilling phase where the support tube 4 is rotated, the cylinders 20 are in the retracted position, and the lower end of the central injection tube 15 is closed by the cutting head 13. In addition, in this position retracted from the jacks 20, the cam 45 is urged by the sealing piston 18 so that the valves 40-42 are pressed under the blades 10-12.
  • the jacks 20 are deployed causing an upward movement of the central injection tube 15 and of the sealing piston 18 integral with the latter. During this movement, the cam 45 is tilted and the valves 40-42 are brought into their injection position where they form a closure belt around the support tube 4.
  • the end of the central injection tube 15 is located at a distance from the cutting head 13, thus providing a passage for the injection of the concrete.
  • annular chamber 33 is formed between the piston 37 and the disc 32, and the latter is then filled with oil.
  • the last step, of concreting, is carried out by raising the rotation table 2 without rotating the support tube 4, and by simultaneously injecting concrete into the well via the central injection tube 15.
  • this concrete is constantly monitored so as to avoid a possible "lack" of concrete during, for example, a too abrupt rise of the auger or the appearance of a "pocket” in the drilled well.
  • the drilling device shown in Figures 9 and 10 is, in turn, composed of three augers 48, 49, 50 aligned with their main blades 51, 52, 53 in tangential position, and provided with rotation tables 54, 55, 56 adapted to drive two adjacent augers in reverse rotation.
  • the rotation tables 54-56 of these three augers are also assembled on a common gantry (not shown) allowing simultaneous vertical translation of the three augers.
  • central injection tubes 57, 58, 59 of these three augers 48-50 are supplied from a single concrete plant.
  • Each of the augers 48-50 is moreover provided with a flow meter such as 60 and means such as 61 for regulating the flow subject to the means for measuring the injection pressure of the concrete at the base of the auger. , so as to standardize said injection pressures.
  • regulating means 61 are not shown in detail because they can, advantageously, be designed in a strictly identical manner to the measuring means shown in FIG. 6, the tapped bore 23a of these measuring means then serving to connect the '' a liquid supply pipe making it possible to vary the pressure in the chamber.
  • one of the end augers 48 and the central auger 49 comprise a valve 62, 63 of a shape adapted to overflow, after folding down, the gauge of the blades 51-53 of these augers, and on the other hand, the other end auger 50 and the central auger 49 include a valve 64, 65 of shape complementary to that mentioned above, allowing the latter to be folded down.
  • valves 62-63 comprise a portion covering the point of tangency of the blades of the augers.
  • valves 62, 63 therefore close off the contiguous space of two adjacent augers and ensure continuity of the concrete wall.

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Description

L'invention concerne une tarière creuse pour la réalisation de pieux moulés dans le sol, par injection d'un produit de remplissage tel que du béton. Elle s'étend à un dispositif de forage comportant au moins deux de ces tarières et destiné à la fabrication de parois par pieux jointifs.The invention relates to a hollow auger for making piles molded into the ground, by injection of a filling product such as concrete. It extends to a drilling device comprising at least two of these augers and intended for the manufacture of walls by contiguous piles.

Il existe à l'heure actuelle deux types principaux de tarières pour la réalisation de pieux moulés dans le sol par injection de béton. Le premier type, décrit notamment dans les brevets GB 2.210.919 et EP 378 348, consiste en un tube support creux comportant une pale externe longitudinale, à l'intérieur duquel on injecte le béton une fois le puits réalisé. Le deuxième type, décrit notamment dans le brevet FR 2.318.275, comporte un tube support creux portant une pale externe longitudinale, et un tube central d'injection s'étendant dans ce tube et solidarisé à ce dernier, à l'intérieur duquel est injecté le béton, selon le préambule de la revendication 1.There are currently two main types of augers for making piles molded into the ground by concrete injection. The first type, described in particular in patents GB 2,210,919 and EP 378,348, consists of a hollow support tube comprising a longitudinal external blade, inside which the concrete is injected once the well has been made. The second type, described in particular in patent FR 2,318,275, comprises a hollow support tube carrying a longitudinal external blade, and a central injection tube extending into this tube and secured to the latter, inside which is injected concrete, according to the preamble of claim 1.

Bien que ces tarières présentent des avantages spécifiques découlant de leur conception propre, ces dernières présentent en commun l'inconvénient de comporter une conduite d'injection du béton (tube support ou tube central) entraînée en rotation par la table de rotation. Cet entraînement en rotation de la conduite d'injection du béton a, en effet, pour première conséquence l'obligation d'équiper les tarières d'organes (joints tournants, raccords tournants...) visant à permettre le raccordement d'une partie tournante à une partie fixe constituée par la conduite d'alimentation en béton.Although these augers have specific advantages arising from their own design, they have the common disadvantage of having a concrete injection pipe (support tube or central tube) driven in rotation by the rotation table. This rotary drive of the concrete injection pipe has, in fact, for the first consequence the obligation to equip the augers with organs (rotary joints, rotary unions ...) aiming to allow the connection of a part rotating to a fixed part constituted by the concrete supply pipe.

Une deuxième conséquence concerne une relative inefficacité du système de contrôle de la pression d'injection auquel sont asservis les organes de remontée, et ce quelle que soit la solution proposée, à savoir contrôle en tête de la tarière (FR 2.318.275) ou à la base de la tarière (GB 2.210.919).A second consequence relates to a relative ineffectiveness of the injection pressure control system to which the ascent members are controlled, and this regardless of the solution proposed, namely control at the head of the auger (FR 2.318.275) or at the base of the auger (GB 2.210.919).

En effet, si les mesures de pression sont réalisées en tête de tarière, comme décrit dans le brevet FR 2.318.275, il ne peut être pris en compte dans les mesures celles correspondant à la hauteur de béton frais dans la conduite d'injection. Or, lorsque l'injection a lieu dans un sol dont la pression de fluage est inférieure à celle correspondant à la hauteur de béton frais dans la conduite, le pieu ne peut être moulé car le béton se dissipe dans le sol. La seule solution consiste alors à ne remplir que partiellement et de façon aléatoire la conduite, de sorte que la pression soit admissible pour le terrain considéré.In fact, if the pressure measurements are carried out at the head of the auger, as described in patent FR 2,318,275, it cannot be taken into account in the measurements those corresponding to the height of fresh concrete in the injection pipe. However, when the injection takes place in a soil whose creep pressure is lower than that corresponding to the height of fresh concrete in the pipe, the pile cannot be molded because the concrete dissipates in the soil. The only solution then consists in filling only partially and randomly the pipe, so that the pressure is admissible for the terrain considered.

La solution décrite dans le brevet GB 2.210.919 consistant à effectuer les mesures à la base de la tarière oblige, quant à elle, à transmettre les signaux représentatifs de la mesure d'une pièce tournante à une pièce fixe de rotation. Or, toutes les solutions envisagées jusqu'à ce jour pour réaliser ce transfert se sont avérées très peu fiables et ont constitué la cause d'erreurs et de dérives importantes.The solution described in patent GB 2,210,919 consisting in carrying out the measurements at the base of the auger means, for its part, to transmit the signals representative of the measurement from a rotating part to a fixed rotating part. However, all the solutions envisaged to date for carrying out this transfer have proven to be very unreliable and have constituted the cause of errors and significant deviations.

La présente invention se propose de pallier les inconvénients des tarières ci-dessus décrites et a pour premier objectif de fournir une tarière dotée d'un tube central d'injection ne nécessitant aucun organe, tel que raccord tournant..., pour le raccordement de ce dernier, et de fournir une tarière dotée d'un système de contrôle de la pression d'injection fiable et efficace.The present invention proposes to overcome the drawbacks of the augers described above and has as a first objective to provide an auger provided with a central injection tube requiring no member, such as swivel connector ..., for the connection of the latter, and to provide an auger with a reliable and efficient injection pressure control system.

Un objectif secondaire est de fournir une tarière dotée de clapets d'obturation actionnés automatiquement de façon très simple avant la phase de remontée de ladite tarière.A secondary objective is to provide an auger with shutter valves actuated automatically in a very simple manner before the ascent phase of said auger.

Un autre objectif de l'invention est de fournir un dispositif de forage pour la réalisation de pieux jointifs, constitué à partir de tarières conformes à ladite invention.Another object of the invention is to provide a drilling device for the production of contiguous piles, made from augers according to said invention.

A cet effet, la présente invention vise une tarière creuse pour la réalisation de pieux moulés dans le sol par injection d'un produit de remplissage tel que du béton, du type comprenant :

  • un tube support creux comportant au moins une pale externe longitudinale, dite principale, s'étendant sous la forme d'une hélice le long dudit tube support, et une tête de coupe disposée au niveau d'une des extrémités, dite inférieure, dudit tube support,
  • des moyens d'entraînement en rotation et des moyens d'entraînement en translation verticale du tube support,
  • un tube central d'injection connecté à une source d'alimentation en produit de remplissage, s'étendant longitudinalement à l'intérieur du tube support avec lequel il délimite un volume annulaire,
  • un piston d'étanchéité disposé dans le volume annulaire vers l'extrémité inférieure du tube support.
  • et des moyens de mesure de la pression d'injection.
To this end, the present invention relates to a hollow auger for the production of piles molded in the ground by injection of a filling product such as concrete, of the type comprising:
  • a hollow support tube comprising at least one longitudinal external blade, called the main, extending in the form of a helix along the said support tube, and a cutting head disposed at one of the ends, called the bottom, of the said tube support,
  • means for driving in rotation and means for driving in vertical translation of the support tube,
  • a central injection tube connected to a filling product supply source, extending longitudinally inside the support tube with which it delimits an annular volume,
  • a sealing piston placed in the annular volume towards the lower end of the support tube.
  • and means for measuring the injection pressure.

Selon l'invention, cette tarière se caractérise en ce qu'elle comprend :

  • des moyens de maintien du tube central d'injection adaptés pour bloquer en rotation ledit tube central et pour permettre un déplacement en translation simultané dudit tube central et du tube support,
  • des moyens de centrage disposés dans le volume annulaire en vue de maintenir de façon concentrique le tube central d'injection et le tube support, lesdits organes de centrage et le piston d'étanchéité étant solidaires du tube central et aptes à permettre une rotation du tube support autour dudit tube central d'injection,
  • des moyens de mesure de pression disposés vers l'extrémité inférieure du tube support en vue de permettre des mesures de la pression du produit de remplissage injecté à la base de la tarière,
  • et des moyens de liaison reliant les moyens de mesure à un poste de commande externe, logés dans le volume annulaire et adaptés pour délivrer vers le poste de commande le résultat des mesures.
According to the invention, this auger is characterized in that it comprises:
  • means for holding the central injection tube suitable for locking in rotation said central tube and for allowing simultaneous translation movement of said central tube and of the support tube,
  • centering means arranged in the annular volume in order to concentrically hold the central injection tube and the support tube, said centering members and the sealing piston being integral with the central tube and able to allow rotation of the tube support around said central injection tube,
  • pressure measuring means arranged towards the lower end of the support tube in order to allow measurements of the pressure of the filling product injected at the base of the auger,
  • and connecting means connecting the measuring means to an external control station, housed in the annular volume and adapted to deliver the results of the measurements to the control station.

La tarière selon l'invention comporte donc un tube central d'injection pouvant être raccordé de façon très simple à la conduite d'alimentation en béton, sans l'interposition de raccord tournant ou autre organe visant la même fonction.The auger according to the invention therefore comprises a central injection tube which can be connected in a very simple way to the concrete supply pipe, without the interposition of a rotary connector or other member aiming at the same function.

De plus, les moyens de mesure permettent de disposer, au niveau du poste de commande, de relevés de mesure représentant de façon fidèle la pression d'injection en base de tarière, et autorisent un pilotage des organes de remontée prenant en compte la hauteur de béton dans le tube central d'injection, la présence de hors-profils accidentels...In addition, the measurement means make it possible to have, at the control station, measurement readings faithfully representing the injection pressure at the base of the auger, and allow control of the ascent members taking into account the height of concrete in the central injection tube, the presence of accidental out-profiles ...

Selon un premier mode de réalisation préférentiel concernant les moyens de mesure, ces derniers comprennent :

  • une chambre remplie de fluide disposée dans le volume annulaire et communiquant avec le volume interne du tube central d'injection par l'intermédiaire d'au moins une ouverture obturée par une membrane apte à être déformée lors d'une injection de produit de remplissage,
  • un organe de mesure de la pression de fluide à l'intérieur de la chambre.
According to a first preferred embodiment concerning the measurement means, the latter include:
  • a chamber filled with fluid arranged in the annular volume and communicating with the internal volume of the central injection tube by means of at least one opening closed by a membrane capable of being deformed during an injection of filling product,
  • a member for measuring the fluid pressure inside the chamber.

Selon une variante de réalisation, ces moyens de mesure comprennent avantageusement :

  • un disque disposé dans le volume annulaire entre le piston d'étanchéité et l'extrémité du tube central d'injection, ledit disque, monté coulissant et limité dans ses déplacements par une butée basse solidaire du tube central d'injection, délimitant une chambre annulaire remplie de fluide avec le piston d'étanchéité,
  • un organe de mesure de la pression de fluide dans la chambre annulaire.
According to an alternative embodiment, these measurement means advantageously comprise:
  • a disc placed in the annular volume between the sealing piston and the end of the central injection tube, said disc, mounted to slide and limited in its movements by a low stop secured to the central injection tube, delimiting an annular chamber filled with fluid with the sealing piston,
  • a member for measuring the fluid pressure in the annular chamber.

La conception de la tarière selon l'invention permet, par ailleurs, de réaliser, de façon simple, un dispositif de forage pour la fabrication de parois par pieux jointifs.The design of the auger according to the invention also makes it possible, in a simple manner, to produce a drilling device for the manufacture of walls by contiguous piles.

Selon l'invention, ce dispositif de forage comprend au moins deux tarières dotées chacune de moyens de mesure de la pression de béton injecté, et comportant des moyens d'entraînement en rotation individuels adaptés pour les entraîner en rotation inverse les unes par rapport aux autres, et des moyens d'entraînement en translation communs, lesdites tarières étant alignées avec leurs pales principales en position tangentielle, et comportant chacune des moyens de régulation du débit de produit de remplissage aptes à uniformiser les pressions d'injection dudit produit.According to the invention, this drilling device comprises at least two augers each provided with means for measuring the pressure of injected concrete, and comprising individual rotation drive means adapted to drive them in reverse rotation with respect to each other , and common translational drive means, said augers being aligned with their main blades in tangential position, and each comprising means for regulating the flow rate of filling product capable of standardizing the injection pressures of said product.

Par ailleurs, selon un mode de réalisation préférentiel de la tarière dans lequel les moyens d'entraînement en rotation sont constitués d'une table de rotation comportant une partie fixe en rotation solidarisée aux moyens d'entraînement en translation du tube support, et une partie mobile en rotation portant ledit tube support, les moyens de maintien du tube central d'injection sont solidarisés à la partie fixe en rotation de la table de rotation.Furthermore, according to a preferred embodiment of the auger in which the rotation drive means consist of a rotation table comprising a fixed part in rotation secured to the translation drive means of the support tube, and a part mobile in rotation carrying said support tube, the means for holding the central injection tube are secured to the stationary part in rotation of the rotation table.

En outre, selon une autre caractéristique de l'invention visant la tarière :

  • la tête de coupe comporte une partie centrale de forme adaptée pour obturer sur sa plus grande surface l'extrémité inférieure du tube central d'injection,
  • des moyens de déplacement axial du tube central d'injection sont adaptés pour lui conférer une possibilité de déplacement axial relativement au tube support, entre une position dite basse où l'extrémité inférieure dudit tube central est au contact de la partie centrale de la tête de coupe, et une position dite haute où ladite extrémité inférieure est distante d'une longueur prédéterminée de la tête de coupe en vue de permettre l'injection du produit de remplissage.
In addition, according to another characteristic of the invention targeting the auger:
  • the cutting head comprises a central part of a shape adapted to seal over its larger surface the lower end of the central injection tube,
  • means of axial displacement of the central injection tube are adapted to give it a possibility of axial displacement relative to the support tube, between a so-called low position where the lower end of said central tube is in contact with the central part of the head cutting, and a so-called high position where said lower end is spaced a predetermined length from the cutting head in order to allow the injection of the filling product.

De cette façon, le tube central d'injection est obturé lors du forage évitant ainsi toute remontée de matériau dans ledit tube, puis son extrémité est ouverte de façon très simple en vue de l'injection du béton.In this way, the central injection tube is closed during drilling, thus avoiding any material rising in said tube, then its end is opened in a very simple way for the injection of concrete.

Selon une autre caractéristique de l'invention, la tarière creuse comprend avantageusement :

  • au moins une pale complémentaire s'étendant à partir de l'extrémité inférieure du tube support et définissant une portion de spire décalée angulairement par rapport à la première spire de la pale principale,
  • associé à chaque pale, un clapet présentant une forme en hélice conjuguée de ladite pale, articulé sur le tube support au niveau de l'extrémité de ce dernier, de façon à pouvoir pivoter entre deux positions :
    • . une position, dite de forage, où chaque clapet se trouve plaqué sous la pale associée,
    • . une position, dite d'injection, où l'ensemble des clapets forme une ceinture d'obturation autour de l'extrémité inférieure du tube support,
  • des moyens de pivotement des clapets agencés pour faire pivoter lesdits clapets lors de chaque déplacement axial du tube central d'injection.
According to another characteristic of the invention, the hollow auger advantageously comprises:
  • at least one complementary blade extending from the lower end of the support tube and defining a portion of turn which is angularly offset relative to the first turn of the main blade,
  • associated with each blade, a valve having a conjugate helical shape of said blade, articulated on the support tube at the end of the latter, so as to be able to pivot between two positions:
    • . a position, called a drilling position, where each valve is placed under the associated blade,
    • . a so-called injection position where the set of valves forms a closure belt around the lower end of the support tube,
  • pivot means of the valves arranged to rotate said valves during each axial movement of the central injection tube.

De tels clapets forment ainsi une ceinture d'obturation visant à empêcher la remontée du béton entre deux pales successives.Such valves thus form a shutter belt aimed at preventing the rise of the concrete between two successive blades.

Selon un mode de réalisation préférentiel concernant cette ceinture d'obturation :

  • le piston d'étanchéité est doté d'une rainure annulaire en regard du tube support,
  • chaque clapet est monté sur un axe d'articulation porté par le tube support et agencé pour déboucher dans la rainure annulaire du piston d'étanchéité,
  • les moyens de pivotement comprennent une came portée par l'axe d'articulation de chaque clapet, ladite came étant logée dans la rainure annulaire du piston d'étanchéité et agencée pour être basculée par ledit piston lors des déplacements axiaux du tube central d'injection, de façon à entraîner une rotation de l'axe d'articulation adaptée pour amener les clapets soit dans la position de forage, soit dans la position d'injection.
According to a preferred embodiment concerning this closure belt:
  • the sealing piston has an annular groove opposite the support tube,
  • each valve is mounted on a hinge pin carried by the support tube and arranged to open into the annular groove of the sealing piston,
  • the pivoting means comprise a cam carried by the hinge pin of each valve, said cam being housed in the annular groove of the sealing piston and arranged to be tilted by said piston during axial movements of the central injection tube , so as to cause a rotation of the hinge pin adapted to bring the valves either in the drilling position or in the injection position.

En ce qui concerne le dispositif de forage conforme à l'invention, au moins deux clapets de deux tarières adjacentes présentent préférentiellement des formes complémentaires adaptées afin que, pour une position en vis-à-vis desdits clapets, ces derniers comportent une portion de recouvrement du point de tangence des pales principales desdites tarières.With regard to the drilling device according to the invention, at least two valves of two adjacent augers preferably have complementary shapes adapted so that, for a position vis-à-vis said valves, the latter comprise a covering portion the point of tangency of the main blades of said augers.

De ce fait, l'emprise extérieure de la surface des clapets, après rabattement, déborde le gabarit des pales des tarières, et pour une orientation convenable de celles-ci, on obtient un recouvrement du point de tangence des pales des deux tarières voisines.Therefore, the outer grip of the surface of the valves, after folding, extends beyond the size of the auger blades, and for a suitable orientation thereof, there is an overlap of the point of tangency of the blades of the two adjacent augers.

Cette disposition permet d'assurer une continuité du panneau de béton moulé, même si les tarières ne sont pas tout à fait accolées comme cela se produit pour certains matériaux.This arrangement ensures continuity of the molded concrete panel, even if the augers are not completely joined as is the case with certain materials.

Selon une autre caractéristique de l'invention, la partie fixe de la table de rotation est constituée de deux éléments solidarisés par des moyens de pivotement aptes à permettre une rotation relative desdits éléments l'un par rapport à l'autre : un premier élément solidarisé aux moyens d'entraînement en translation de ladite table de rotation, et un deuxième élément portant la partie mobile en rotation de cette table de rotation, les moyens de pivotement étant adaptés pour permettre une rotation dudit deuxième élément entre une position de travail où le tube support s'étend sensiblement verticalement, et une position de montage où ce tube support s'étend sensiblement horizontalement.According to another characteristic of the invention, the fixed part of the rotation table consists of two elements secured by pivoting means capable of allowing relative rotation of said elements relative to each other: a first element secured to the drive means in translation of said rotation table, and a second element carrying the mobile part in rotation of this rotation table, the pivoting means being adapted to allow rotation of said second element between a working position where the tube support extends substantially vertically, and a mounting position where this support tube extends substantially horizontally.

Cette particularité permet de disposer la table de rotation avec son axe de rotation horizontal en vue, dans un premier temps, d'emboîter les uns dans les autres les tronçons successifs du tube support, puis, dans un deuxième temps, d'enfiler dans ce tube support, le tube central d'injection.This feature makes it possible to arrange the rotation table with its horizontal axis of rotation with a view, firstly, of nesting into each other the successive sections of the support tube, then, secondly, of threading into this support tube, the central injection tube.

Un tel montage peut être réalisé de façon aisée et permet, en outre, d'introduire dans le tube support un tube central d'injection pré-assemblé et dont les moyens de liaison des moyens de mesure ne présentent qu'un minimum de raccords.Such an assembly can be carried out easily and also makes it possible to introduce into the support tube a pre-assembled central injection tube, the connection means of the measurement means of which have only a minimum of connections.

D'autres caractéristiques, buts et avantages de l'invention ressortiront de la description détaillée qui suit en référence aux dessins annexés qui en représentent à titre d'exemples non limitatifs un mode de réalisation préférentiel et une variante de réalisation. Sur ces dessins, qui font partie intégrante de la présente description :

  • la figure 1 est une vue en élévation schématique d'une tarière creuse conforme à l'invention,
  • la figure 2 est une vue de dessus de cette tarière creuse,
  • la figure 3 est une vue de dessous de cette tarière creuse, les clapets étant en position d'injection,
  • la figure 4 en est une vue en élévation partielle représentant l'extrémité inférieure de cette tarière avec les clapets en position de forage,
  • la figure 5 en est une vue en élévation partielle représentant l'extrémité inférieure de cette tarière avec les clapets en position d'injection,
  • la figure 6 est une coupe longitudinale par un plan axial A de l'extrémité inférieure de cette tarière dans la position basse du piston d'étanchéité,
  • la figure 7 représente de façon partielle et en coupe par le plan A, l'extrémité inférieure de la tarière dans la position haute du piston,
  • la figure 8 est une coupe par le plan longitudinal A représentant une variante de réalisation,
  • la figure 9 est une vue en élévation schématique d'un dispositif de forage conforme à l'invention comportant trois tarières,
  • et la figure 10 est une vue de dessous de ce dispositif de forage avec les clapets en position d'injection.
Other characteristics, objects and advantages of the invention will emerge from the detailed description which follows, with reference to the appended drawings which show by way of nonlimiting examples a preferred embodiment and an alternative embodiment. In these drawings, which are an integral part of this description:
  • FIG. 1 is a schematic elevation view of a hollow auger according to the invention,
  • FIG. 2 is a top view of this hollow auger,
  • FIG. 3 is a bottom view of this hollow auger, the valves being in the injection position,
  • FIG. 4 is a partial elevation view showing the lower end of this auger with the valves in the drilling position,
  • FIG. 5 is a partial elevation view showing the lower end of this auger with the valves in the injection position,
  • FIG. 6 is a longitudinal section through an axial plane A of the lower end of this auger in the low position of the sealing piston,
  • FIG. 7 represents partially and in section through plane A, the lower end of the auger in the high position of the piston,
  • FIG. 8 is a section through the longitudinal plane A showing an alternative embodiment,
  • FIG. 9 is a schematic elevation view of a drilling device according to the invention comprising three augers,
  • and Figure 10 is a bottom view of this drilling device with the valves in the injection position.

La tarière creuse représentée aux figures 1 à 8 et le dispositif de forage représenté aux figures 9 et 10 sont destinés à la réalisation respectivement de pieux moulés et de parois par pieux jointifs, par injection de béton.The hollow auger shown in Figures 1 to 8 and the drilling device shown in Figures 9 and 10 are intended for the production of molded piles and walls respectively by adjoining piles, by concrete injection.

En premier lieu, la tarière creuse comprend, de façon classique, un mât 1 le long duquel coulisse une table de rotation hydraulique 2 comportant une tête 3 d'accouplement avec un tube support 4, et des treuils hydrauliques tels que 5 assurant par l'intermédiaire de câbles tels que 6 et de poulies telles que 7, les déplacements en translation verticale de la table de rotation 2.First, the hollow auger comprises, in a conventional manner, a mast 1 along which slides a hydraulic rotation table 2 comprising a head 3 for coupling with a support tube 4, and hydraulic winches such as 5 ensuring by the intermediate cables such as 6 and pulleys such as 7, the displacements in vertical translation of the rotation table 2.

La table de rotation 2 comporte, en premier lieu, une partie fixe en rotation se décomposant en deux éléments 2a, 2b solidarisés par l'intermédiaire de moyens de pivotement aptes à permettre une rotation relative desdits éléments l'un par rapport à l'autre.The rotation table 2 comprises, in the first place, a fixed part in rotation which decomposes into two elements 2a, 2b secured by means of pivoting means able to allow relative rotation of said elements with respect to each other .

Le premier de ces éléments 2a consiste en un chariot agencé pour coulisser le long du mât 1 et comportant deux glissières 8 adaptées pour coopérer avec deux rails de guidage verticaux 9 s'étendant latéralement de part et d'autre de ce mât 1.The first of these elements 2a consists of a carriage arranged to slide along the mast 1 and comprising two slides 8 adapted to cooperate with two vertical guide rails 9 extending laterally on either side of this mast 1.

Le deuxième élément 2b de cette partie fixe en rotation porte le moteur d'entraînement en rotation du tube support 4, adapté pour entraîner en rotation la tête d'accouplement 3 sous laquelle vient se fixer ledit tube support.The second element 2b of this fixed part in rotation carries the motor for driving in rotation of the support tube 4, adapted to drive in rotation the coupling head 3 under which said support tube is fixed.

Les moyens de pivotement reliant ces deux éléments peuvent consister, par exemple, en un axe d'articulation 2c disposé entre lesdits éléments en partie haute de ces derniers, des moyens de verrouillage, de tout type connu en soi, étant disposés en partie basse des éléments. Ces moyens de pivotement sont adaptés pour entraîner une rotation du deuxième élément 2b autour de l'axe d'articulation 2c, entre une position de travail où l'axe de la tête d'accouplement 3 s'étend verticalement, et une position de montage où cet axe s'étend horizontalement.The pivoting means connecting these two elements may consist, for example, of a hinge pin 2c disposed between said elements in the upper part of the latter, locking means, of any type known per se, being arranged in the lower part of the elements. These pivoting means are adapted to cause rotation of the second element 2b around the articulation axis 2c, between a working position where the axis of the coupling head 3 extends vertically, and a mounting position where this axis extends horizontally.

Le tube support 4 comporte quant à lui une pale principale 10 s'étendant sous la forme d'une hélice le long dudit tube support, et se terminant par un bord d'attaque 10a au niveau de l'extrémité inférieure de ce tube.The support tube 4 comprises a main blade 10 extending in the form of a helix along said support tube, and ending with a leading edge 10a at the lower end of this tube.

Ce tube 4 comporte également deux pales complémentaires 11, 12 s'étendant à partir de l'extrémité inférieure de ce tube support et se terminant chacune par un bord d'attaque 11a, 12a. Ces deux pales complémentaires 11, 12 définissent une portion de spire s'étendant sur 120° et sont décalées par rapport à la pale principale 10 de façon que lesdites pales complémentaires et principale soient régulièrement réparties autour de l'axe du tube support 4.This tube 4 also includes two complementary blades 11, 12 extending from the lower end of this support tube and each ending in a leading edge 11a, 12a. These two complementary blades 11, 12 define a portion of turn extending over 120 ° and are offset relative to the main blade 10 so that said complementary and main blades are regularly distributed around the axis of the support tube 4.

Le tube support 4 comporte, par ailleurs, une tête de coupe 13 disposée dans le prolongement de l'extrémité inférieure dudit tube. Cette tête de coupe 13 est constituée de trois branches radiales 13a, 13b, 13c régulièrement réparties autour de l'axe du tube-support 4 de façon à venir radialement chacune dans l'alignement du bord d'attaque 10a, 11a, 12a d'une pale 10, 11,12.The support tube 4 further comprises a cutting head 13 arranged in the extension of the lower end of said tube. This cutting head 13 consists of three radial branches 13a, 13b, 13c regularly distributed around the axis of the support tube 4 so as to come radially each in alignment with the leading edge 10a, 11a, 12a of a blade 10, 11.12.

Chacune de ces branches 13a-13c présente une forme triangulaire prolongée en partie supérieure par un ergot tel que 14 agencé pour venir s'emboîter dans une rainure ménagée latéralement au niveau du bord d'attaque 10a, 11a, 12a de chaque pale 10-12.Each of these branches 13a-13c has a triangular shape extended in the upper part by a lug such as 14 arranged to come to fit in a groove formed laterally at the leading edge 10a, 11a, 12a of each blade 10-12 .

La tarière creuse comporte, par ailleurs, un tube central d'injection 15 disposé à l'intérieur du tube support 4 avec lequel il délimite un volume annulaire 16.The hollow auger also has a central injection tube 15 placed inside the support tube 4 with which it defines an annular volume 16.

Ce tube central d'injection 15 s'étend à l'intérieur du tube support 4 et de la tête d'accouplement 3 de la table de rotation 2, et se prolonge au-dessus de cette table de rotation par un col de cygne 17 destiné à être relié de façon classique à une pompe à béton (non représentée).This central injection tube 15 extends inside the support tube 4 and the coupling head 3 of the rotation table 2, and is extended above this rotation table by a swan neck 17 intended for be conventionally connected to a concrete pump (not shown).

Au niveau de son extrémité inférieure, le tube central d'injection comporte un piston d'étanchéité 18 solidaire dudit tube et adapté pour obturer le volume annulaire 16.At its lower end, the central injection tube comprises a sealing piston 18 integral with said tube and adapted to close off the annular volume 16.

De plus, des paliers de centrage tels que 19 solidaires du tube central d'injection 15 sont disposés dans le volume annulaire 16 et répartis sur la longueur de ce tube central d'injection. Ces paliers de centrage 19, d'une part, permettent de maintenir le tube central 15 concentriquement par rapport au tube support 4, et d'autre part, autorisent une rotation de ce tube support 4 autour dudit tube central.In addition, centering bearings such as 19 integral with the central injection tube 15 are arranged in the annular volume 16 and distributed over the length of this central injection tube. These centering bearings 19, on the one hand, allow the central tube 15 to be held concentrically with respect to the support tube 4, and on the other hand, allow this support tube 4 to rotate around said central tube.

Les moyens de maintien du tube central d'injection 15 sont quant à eux adaptés pour bloquer ce dernier en rotation et pour permettre un déplacement en translation simultané dudit tube central et du tube support 4, avec toutefois une possibilité de déplacement axial sur une faible longueur du tube central relativement au tube support.The means for holding the central injection tube 15 are adapted to block the latter in rotation and to allow a simultaneous translation movement of said central tube and of the support tube 4, with however a possibility of axial displacement over a short length. of the central tube relative to the support tube.

Ces moyens de maintien comprennent au moins un vérin tel que 20 agencé verticalement et solidarisé respectivement au tube central 15 et à la table de rotation 2, de façon à entraîner lors de son actionnement un déplacement axial dudit tube central relativement à la table de rotation 2 et donc relativement au tube support 4.These holding means comprise at least one jack such as 20 arranged vertically and secured respectively to the central tube 15 and to the rotation table 2, so as to cause, during its actuation, an axial displacement of said central tube relative to the rotation table 2 and therefore relative to the support tube 4.

En l'exemple, les vérins 20 sont au nombre de deux disposés de part et d'autre du tube central 15, et solidarisés respectivement sur la face supérieure de la table de rotation 2 et sous deux plaques telles que 21 fixées sur le col de cygne 17, vers le sommet du coude de ce dernier, de façon à s'étendre horizontalement de part et d'autre de celui-ci.In the example, the jacks 20 are two in number arranged on either side of the central tube 15, and secured respectively on the upper face of the rotation table 2 and under two plates such as 21 fixed on the neck of swan 17, towards the top of the latter's elbow, so as to extend horizontally on either side thereof.

En outre, deux glissières verticales telles que 22 en forme de U sont fixées sur la table de rotation 2 de façon à loger chacune une plaque 21.In addition, two vertical slides such as 22 in the shape of a U are fixed on the rotation table 2 so as to each accommodate a plate 21.

Les vérins 20 sont adaptés pour déplacer le tube central d'injection 15 entre une position basse où l'extrémité inférieure de ce dernier et le piston d'étanchéité sont au contact de la tête de coupe 13, et une position haute où l'extrémité inférieure du tube et le piston sont distants de ladite tête de coupe.The cylinders 20 are adapted to move the central injection tube 15 between a low position where the lower end of the latter and the sealing piston are in contact with the cutting head 13, and a high position where the end bottom of the tube and the piston are spaced from said cutting head.

Tel que représenté à la figure 3, dans la position basse du tube central, ce dernier est en grande partie obturé par la partie centrale de la tête de coupe 13 correspondant au point de concours de trois branches 13a-13c.As shown in Figure 3, in the lower position of the central tube, the latter is largely closed by the central part of the cutting head 13 corresponding to the point of competition of three branches 13a-13c.

Par contre, dans la position haute du tube central 15, un espace annulaire est ménagé entre l'extrémité de ce dernier et la tête de coupe 13, permettant l'injection de béton.By cons, in the high position of the central tube 15, an annular space is formed between the end of the latter and the cutting head 13, allowing the injection of concrete.

La tarière creuse comporte, en outre, des moyens de mesure de la pression de béton à la base du tube support 4.The hollow auger further comprises means for measuring the concrete pressure at the base of the support tube 4.

Selon un premier mode de réalisation représenté aux figures 6 et 7, ces moyens de mesure sont ménagés à l'intérieur du piston d'étanchéité 18 et comportent une chambre annulaire remplie de fluide, communiquant avec le volume interne du tube central 15 par l'intermédiaire d'une ouverture obturée par une membrane apte à être déformée lors de l'injection de béton.According to a first embodiment shown in Figures 6 and 7, these measuring means are arranged inside the sealing piston 18 and comprise an annular chamber filled with fluid, communicating with the internal volume of the central tube 15 by the through an opening closed by a membrane capable of being deformed during the injection of concrete.

Selon ce premier mode de réalisation, l'extrémité inférieure du tube central d'injection 15 présente une portée conique 15a, et ce tube central comporte, à distance au-dessus de cette extrémité, une embase annulaire externe 23 dotée d'une tranche filetée.According to this first embodiment, the lower end of the central injection tube 15 has a conical surface 15a, and this central tube comprises, at a distance above this end, an external annular base 23 provided with a threaded edge .

Le piston 18 est quant à lui constitué de deux tubes coaxiaux 24, 25 délimitant un volume annulaire 26, reliés au niveau de leur extrémité inférieure par une embase annulaire 27 obturant ledit volume.The piston 18 is itself made up of two coaxial tubes 24, 25 delimiting an annular volume 26, connected at their lower end by an annular base 27 closing said volume.

Le tube extérieur 24 de ce piston présente un diamètre externe conjugué du diamètre interne du tube support 4, et comporte une extrémité supérieure taraudée intérieurement permettant de le visser sur l'embase 23 du tube central d'injection 15.The outer tube 24 of this piston has an outer diameter combined with the inner diameter of the support tube 4, and has a tapped upper end internally allowing it to be screwed onto the base 23 of the central injection tube 15.

Le tube intérieur 25 présente, quant à lui, un diamètre interne conjugué du diamètre interne du tube central d'injection 15. Il présente, en outre, une longueur inférieure à celle du tube extérieur 24 de façon que son extrémité supérieure se trouve à distance de l'extrémité inférieure 15a du tube central d'injection 15. De plus, l'extrémité supérieure de ce tube intérieur présente une portée conique 25a.The inner tube 25 has, for its part, an internal diameter combined with the internal diameter of the central injection tube 15. It also has a length less than that of the external tube 24 so that its upper end is at a distance from the lower end 15a of the central injection tube 15. In addition, the upper end of this inner tube has a conical surface 25a.

La membrane 28 est disposée dans l'espace séparant les extrémités 15a, 25a du tube central d'injection 15 et du tube intérieur 25 du piston. Elle est maintenue dans cet espace au moyen d'une pièce annulaire 29 présentant une section en forme de U dont les branches, telles que 29a, sont inclinées de façon à définir des portées coniques conjuguées de celles du tube central d'injection 15 et du tube intérieur 25 du piston. La membrane 28 se trouve donc pincée entre cette pièce annulaire 29 et le tube central d'injection 15, d une part, et le piston 18 d'autre part.The membrane 28 is arranged in the space separating the ends 15a, 25a of the central injection tube 15 and of the internal tube 25 of the piston. It is held in this space by means of an annular part 29 having a U-shaped section whose branches, such as 29a, are inclined so as to define conical bearing surfaces combined with those of the central injection tube 15 and the inner tube 25 of the piston. The membrane 28 is therefore pinched between this annular part 29 and the central injection tube 15, on the one hand, and the piston 18 on the other hand.

La pièce annulaire 29 est, en outre, percée d'orifices 30 de communication avec le volume principal 26 du piston.The annular part 29 is, moreover, pierced with orifices 30 for communication with the main volume 26 of the piston.

Enfin, l'embase supérieure 23 est percée d'un alésage taraudé 23a adapté pour permettre la mise en place d'un capteur 31 à élément piézo-électrique relié au poste de commande par un fil électrique 31a s'étendant dans le volume annulaire 16 de la tarière .Finally, the upper base 23 is pierced with a threaded bore 23a adapted to allow the installation of a sensor 31 with piezoelectric element connected to the control station by an electric wire 31a extending in the annular volume 16 auger.

Le principe de fonctionnement de ces moyens de mesure est décrit ci-dessous, sachant que le volume fermé 26 délimité par le piston 18 et l'embase 23 du tube central 15 est initialement rempli de liquide. Lors de l'injection de béton, la membrane 28 se trouve déformée en fonction de la pression d'injection. Cette déformation entraîne des variations de la pression à l'intérieur du volume 26 et, par voie de conséquence, une déformation mécanique de l'élément piézo-électrique du capteur 31 qui délivre donc un signal de réponse fonction de la pression d'injection du béton.The operating principle of these measuring means is described below, knowing that the closed volume 26 delimited by the piston 18 and the base 23 of the central tube 15 is initially filled with liquid. During concrete injection, the membrane 28 is deformed as a function of the injection pressure. This deformation causes variations in the pressure inside the volume 26 and, consequently, mechanical deformation of the piezoelectric element of the sensor 31 which therefore delivers a response signal depending on the injection pressure of the concrete.

Le deuxième mode de réalisation des moyens de mesure est représenté à la figure 8. Selon cette variante, les moyens de mesure comprennent un disque 32 disposé autour de l'extrémité inférieure du tube central d'injection 15 et monté coulissant le long dudit tube de façon à délimiter avec le piston 18 une chambre annulaire 33 de volume variable. Une butée basse 34 constituée d'un rebord annulaire externe solidaire de l'extrémité du tube central d'injection 15 évite, en outre, le déboîtement du disque 32.The second embodiment of the measuring means is shown in FIG. 8. According to this variant, the measuring means comprise a disc 32 disposed around the lower end of the central injection tube 15 and mounted to slide along said tube. so as to define with the piston 18 an annular chamber 33 of variable volume. A lower stop 34 made up of an external annular rim secured to the end of the central injection tube 15 also prevents disengagement of the disc 32.

Ce disque présente un diamètre externe conjugué du diamètre interne du tube support 4 et comporte deux gorges annulaires dans lesquelles sont logés des joints 35, 36 d'étanchéité avec le tube support 4 et le tube central d'injection 15.This disc has an external diameter combined with the internal diameter of the support tube 4 and comprises two annular grooves in which seals 35, 36 are housed with the support tube 4 and the central injection tube 15.

Le piston est quant à lui constitué d'un cylindre 37 percé d'un alésage longitudinal 38 adapté pour déboucher dans la chambre annulaire 33 et permettant de raccorder cette dernière à une canalisation 39 d'amenée d'huile.The piston consists of a cylinder 37 pierced with a longitudinal bore 38 adapted to open into the annular chamber 33 and allowing the latter to be connected to a pipe 39 for supplying oil.

Le principe de fonctionnement de ces moyens de mesure est le suivant :
   en phase de forage, le piston 37 et le disque 32 sont en contact ou, du moins, proches l'un de l'autre. En fin de forage, le tube central d'injection 15 est déplacé vers le haut créant la chambre annulaire 33 entre le piston 37 et le disque 32. Cette chambre 33 est alors remplie d'un volume d'huile,
   lors de la remontée du tube support 4, la pression du béton s'applique sur le disque 32, entraînant une compression de l'huile renfermé dans la chambre annulaire 33. La pression correspondante est directement délivrée vers le poste de commande par le biais de la canalisation 39.The operating principle of these measurement means is as follows:
during the drilling phase, the piston 37 and the disc 32 are in contact or, at least, close to each other. At the end of drilling, the central injection tube 15 is moved upwards creating the annular chamber 33 between the piston 37 and the disc 32. This chamber 33 is then filled with a volume of oil,
during the raising of the support tube 4, the pressure of the concrete is applied to the disc 32, causing compression of the oil contained in the annular chamber 33. The corresponding pressure is directly delivered to the control station by means of line 39.

En dernier lieu, la tarière creuse comprend trois clapets 40, 41, 42 associés chacun à une pale 10, 11, 12 et destinés à former une ceinture d'obturation externe à la base du tube support 4 lors de la remontée de celui-ci.Finally, the hollow auger comprises three valves 40, 41, 42 each associated with a blade 10, 11, 12 and intended to form an external closure belt at the base of the support tube 4 during the ascent thereof.

Ces clapets 40-42 présentent une forme en hélice et une longueur conjuguées de celles des pales complémentaires 11, 12 adaptées pour permettre de les plaquer chacun sous une pale.These valves 40-42 have a helical shape and a length combined with those of the complementary blades 11, 12 adapted to allow them to be pressed each under a blade.

Ces clapets 40-42 sont portés par des axes d'articulation tels que 43 montés pivotant sur le tube support 4, et traversant la paroi de ce dernier de façon à déboucher dans une rainure annulaire 44 ménagée sur la face externe du piston d'étanchéité 18.These valves 40-42 are carried by articulation pins such as 43 pivotally mounted on the support tube 4, and passing through the wall of the latter so as to open into an annular groove 44 formed on the external face of the sealing piston 18.

L'extrémité de cet axe d'articulation 43 est dotée d'une came 45 adaptée pour être basculée par le piston 18 lors des déplacements axiaux du tube central d'injection 15 de façon à amener les clapets :

  • dans une position de forage où chaque clapet 40-42 se trouve plaqué sous la pale 10-12 associée, lorsque le piston 18 est en position basse (figures 4, 6, et 8),
  • dans une position d'injection où l'ensemble des clapets 40-42 forme une ceinture d'obturation sur le pourtour du tube support 4, lorsque le piston 18 est en position haute (figures 3, 5, 7).
The end of this articulation axis 43 is provided with a cam 45 adapted to be tilted by the piston 18 during the axial displacements of the central injection tube 15 so as to bring the valves:
  • in a drilling position where each valve 40-42 is placed under the associated blade 10-12, when the piston 18 is in the low position (FIGS. 4, 6, and 8),
  • in an injection position where the set of valves 40-42 forms a closure belt around the periphery of the support tube 4, when the piston 18 is in the high position (Figures 3, 5, 7).

Enfin, afin de protéger le système de came contre toute remontée éventuelle de matériau dans la rainure 44, le piston 18 est doté, de part et d'autre de cette rainure 44, de deux gorges annulaires logeant un joint 46, 47 d'étanchéité avec la paroi du tube support 4.Finally, in order to protect the cam system against any possible rise of material in the groove 44, the piston 18 is provided, on either side of this groove 44, with two annular grooves housing a seal 46, 47 for sealing with the wall of the support tube 4.

Le fonctionnement de la tarière creuse ci-dessus décrite est le suivant :
   Dans une phase préliminaire de montage, la table de rotation 2 est disposée de façon que la tête d'accouplement 3 s'étende horizontalement. De cette façon, et en premier lieu, le tube support 4 peut être confectionné de façon aisée, à partir de tronçons de tubes allongés sur le sol que l'on emboîte, pour le premier sur la tête d'accouplement 4, puis successivement les uns aux autres.The operation of the hollow auger described above is as follows:
In a preliminary assembly phase, the rotation table 2 is arranged so that the coupling head 3 extends horizontally. In this way, and in the first place, the support tube 4 can be made easily, from sections of tubes lying on the ground which are fitted, for the first on the coupling head 4, then successively the to each other.

En outre, le tube central d'injection 15 peut ensuite être introduit dans le tube support d'un seul tenant, le câble électrique 31a (ou la canalisation 39) étant préassemblé sur ce dernier sans (ou avec un minium de) raccords.In addition, the central injection tube 15 can then be introduced into the support tube in one piece, the electric cable 31a (or the pipe 39) being preassembled on the latter without (or with a minimum of) fittings.

Une fois, cette phase préliminaire de montage effectuée, et la table de rotation pivotée de façon que la tarière s'étende verticalement, la réalisation d'un pieu s'effectue de la façon suivante :
   En phase de forage où le tube support 4 est entraîné en rotation, les vérins 20 sont en position rétractée, et l'extrémité inférieure du tube central d'injection 15 se trouve obturée par la tête de coupe 13. De plus, dans cette position rétractée des vérins 20, la came 45 est sollicitée par le piston d'étanchéité 18 de façon que les clapets 40-42 soient plaqués sous les pales 10-12.Once this preliminary assembly phase has been carried out, and the rotation table pivoted so that the auger extends vertically, a pile is made as follows:
In the drilling phase where the support tube 4 is rotated, the cylinders 20 are in the retracted position, and the lower end of the central injection tube 15 is closed by the cutting head 13. In addition, in this position retracted from the jacks 20, the cam 45 is urged by the sealing piston 18 so that the valves 40-42 are pressed under the blades 10-12.

Une fois le forage effectué, les vérins 20 sont déployés entraînant un déplacement vers le haut du tube central d'injection 15 et du piston d'étanchéité 18 solidaire de ce dernier. Au cours de ce déplacement, la came 45 est basculée et les clapets 40-42 sont amenés dans leur position d'injection où ils forment une ceinture d'obturation autour du tube support 4.Once the drilling has been carried out, the jacks 20 are deployed causing an upward movement of the central injection tube 15 and of the sealing piston 18 integral with the latter. During this movement, the cam 45 is tilted and the valves 40-42 are brought into their injection position where they form a closure belt around the support tube 4.

De plus, une fois les vérins 20 déployés, l'extrémité du tube central d'injection 15 se trouve à distance de la tête de coupe 13, ménageant ainsi un passage pour l'injection du béton.In addition, once the jacks 20 have been deployed, the end of the central injection tube 15 is located at a distance from the cutting head 13, thus providing a passage for the injection of the concrete.

Enfin, selon la variante représentée à la figure 8, une chambre annulaire 33 est ménagée entre le piston 37 et le disque 32, et cette dernière est alors remplie d'huile.Finally, according to the variant shown in Figure 8, an annular chamber 33 is formed between the piston 37 and the disc 32, and the latter is then filled with oil.

La dernière étape, de bétonnage, est réalisée en remontant la table de rotation 2 sans entraîner en rotation le tube support 4, et en injectant simultanément du béton dans le puits par l'intermédiaire du tube central d'injection 15.The last step, of concreting, is carried out by raising the rotation table 2 without rotating the support tube 4, and by simultaneously injecting concrete into the well via the central injection tube 15.

En outre, la pression d'injection de ce béton est constamment contrôlée de façon à éviter un "manque" éventuel de béton lors, par exemple, d'une remontée trop brutale de la tarière ou de l'apparition d'une "poche" dans le puits foré.In addition, the injection pressure of this concrete is constantly monitored so as to avoid a possible "lack" of concrete during, for example, a too abrupt rise of the auger or the appearance of a "pocket" in the drilled well.

Le dispositif de forage représenté aux figures 9 et 10 est, quant à lui, composé de trois tarières 48, 49, 50 alignées avec leurs pales principales 51, 52, 53 en position tangentielle, et dotées de tables de rotation 54, 55, 56 adaptées pour entraîner en rotation inverse deux tarières voisines.The drilling device shown in Figures 9 and 10 is, in turn, composed of three augers 48, 49, 50 aligned with their main blades 51, 52, 53 in tangential position, and provided with rotation tables 54, 55, 56 adapted to drive two adjacent augers in reverse rotation.

Les tables de rotation 54-56 de ces trois tarières sont, en outre, réunies sur un portique commun (non représenté) permettant une translation verticale simultanée des trois tarières.The rotation tables 54-56 of these three augers are also assembled on a common gantry (not shown) allowing simultaneous vertical translation of the three augers.

De plus, les tubes centraux d'injection 57, 58, 59 de ces trois tarières 48-50 sont alimentés à partir d'une centrale à béton unique.In addition, the central injection tubes 57, 58, 59 of these three augers 48-50 are supplied from a single concrete plant.

Chacune des tarières 48-50 est, par ailleurs, dotée d'un compteur de débit tel que 60 et de moyens tels que 61 de régulation du débit asservis aux moyens de mesure de la pression d'injection du béton à la base de la tarière, de façon à uniformiser lesdites pressions d'injection.Each of the augers 48-50 is moreover provided with a flow meter such as 60 and means such as 61 for regulating the flow subject to the means for measuring the injection pressure of the concrete at the base of the auger. , so as to standardize said injection pressures.

Ces moyens de régulation 61 sont conçus de façon identique aux moyens de mesure et comprennent par conséquent :

  • une chambre remplie de fluide communiquant avec le volume interne du tube central d'injection par l'intermédiaire d'au moins une ouverture obturée par une membrane apte à être déformée en fonction de la pression de fluide à l'intérieur de ladite chambre,
  • des moyens d'ajustement de la pression de fluide à l'intérieur de la chambre, adaptés pour moduler cette pression et entraîner une déformation de la membrane conduisant à une restriction variable de la section de passage du tube central d'injection.
These regulating means 61 are designed identically to the measuring means and therefore include:
  • a chamber filled with fluid communicating with the internal volume of the central injection tube via at least one opening closed by a membrane capable of being deformed as a function of the fluid pressure inside said chamber,
  • means for adjusting the fluid pressure inside the chamber, adapted to modulate this pressure and cause a deformation of the membrane leading to a variable restriction of the passage section of the central injection tube.

Ces moyens de régulation 61 ne sont pas représentés en détail car ils peuvent, de façon avantageuse, être conçus de façon strictement identique aux moyens de mesure représentes à la figure 6, l'alésage taraudé 23a de ces moyens de mesure servant alors au raccordement d'une canalisation d'amenée de liquide permettant de faire varier la pression dans la chambre.These regulating means 61 are not shown in detail because they can, advantageously, be designed in a strictly identical manner to the measuring means shown in FIG. 6, the tapped bore 23a of these measuring means then serving to connect the '' a liquid supply pipe making it possible to vary the pressure in the chamber.

Enfin, tel que représenté à la figure 10, d'une part, une des tarières d'extrémité 48 et la tarière centrale 49 comprennent un clapet 62, 63 de forme adaptée pour déborder, après rabattement, le gabarit des pales 51-53 de ces tarières, et d'autre part, l'autre tarière d'extrémité 50 et la tarière centrale 49 comprennent un clapet 64, 65 de forme complémentaire à celui précité, permettant le rabattement de ce dernier.Finally, as shown in FIG. 10, on the one hand, one of the end augers 48 and the central auger 49 comprise a valve 62, 63 of a shape adapted to overflow, after folding down, the gauge of the blades 51-53 of these augers, and on the other hand, the other end auger 50 and the central auger 49 include a valve 64, 65 of shape complementary to that mentioned above, allowing the latter to be folded down.

Tel que représenté à la figure 10, pour une orientation relative correcte des tarières 48-50 obtenue par exemple par une indexation de leur position, les clapets 62-63 comportent une portion de recouvrement du point de tangence des pales des tarières.As shown in FIG. 10, for a correct relative orientation of the augers 48-50 obtained for example by indexing their position, the valves 62-63 comprise a portion covering the point of tangency of the blades of the augers.

Ces clapets 62, 63 obturent donc l'espace contigu de deux tarières voisines et assurent une continuité de la paroi de béton.These valves 62, 63 therefore close off the contiguous space of two adjacent augers and ensure continuity of the concrete wall.

Claims (15)

  1. A hollow auger for producing cast piles in situ by injection of a filling product such as concrete, of the type comprising:
    - a hollow supporting tube (4) comprising at least one external longitudinal blade (10), the so-called main blade, extending in the form of a helix along said supporting tube and a cutter head (13) arranged at the level of one of its ends, the so-called lower end, of said supporting tube,
    - means (2, 3) for driving the supporting tube (4) in rotation and means (1, 5, 6, 7) for driving said supporting tube so as to bring about translatory vertical displacement,
    - a central injection tube (15) connected to a source for supplying filling product, whereby said tube extends longitudinally within the supporting tube (4) so as to delimit jointly with the latter an annular space (16),
    - a sealing piston (18) arranged within the annular space (16) near the lower end of the supporting tube (4)
    - and means for measuring the injection pressure,
    said auger being characterised in that it comprises:
    - means (20, 21) for retaining the central injection tube (15), so designed as to block rotation of said central tube and enable simultaneous translatory displacement of said central tube and the supporting tube (4),
    - centring means (19) arranged within the annular space (16) with a view to maintaining the central injection tube (15) and the supporting tube (4) in concentric manner, said centring devices and the sealing piston (18) being firmly connected to the central tube (15) and so designed as to enable the supporting tube (4) to rotate about said central injection tube,
    - means (24-31; 32-38) for measuring pressure arranged near the lower end of the supporting tube with a view to enabling the pressure of the concrete injected at the foot of the auger to be measured,
    - and connecting means (31a, 39) linking the measuring means (24-31; 32-38) with an external control panel, said means being located within the annular space (16) and so designed as to supply the result of the measurements to the control panel.
  2. A hollow auger according to Claim 1, characterised in that:
    - the cutter head (13) comprises a central section of such shape as to block with its largest surface the lower end of the central injection tube (15),
    - axial displacement means (20) pertaining to the central injection tube (15) are so designed as to enable the latter to be axially displaced in relation to the supporting tube (4) between a position known as the low position in which the lower end of said central tube is in contact with the central section of the cutter head (13) and a position known as the high position in which said lower end is spaced by a predetermined length in relation to the cutter head (13) so as to enable the injection of the filling product.
  3. A hollow auger according to one of Claims 1 or 2, in which the means for rotary driving comprise a rotation table (2) with a rotationally fixed section (2a, 2b) firmly connected to the translatory driving means (1, 5, 6, 7) of the supporting tube (4) and a rotationally mobile section (3) bearing said supporting tube, said auger being characterised in that the means (20, 21) for retaining the central injection tube (15) are firmly connected to the rotationally fixed section (2a, 2b) of the rotation table (2).
  4. A hollow auger according to Claims 2 and 3 jointly, characterised in that the means for retaining the central injection tube (15) comprise at least one jack (20) arranged vertically and firmly connected to both the said central tube and to the rotation table (2) so as to serve as the axial displacement means of said central tube.
  5. A hollow auger according to one of the preceding claims, characterised in that it comprises:
    - at least one complementary blade (11, 12) extending from the lower end of the supporting tube (4) and defining a helical section angularly offset in relation to the first winding of the main blade (10),
    - a flap (40-42)associated with each blade (10, 12), said flap exhibiting a helical shape matching said blade, said flap being articulated on the supporting tube (4) at the level of the end of the latter so as to be capable of pivoting between two positions,
    . a position, the so-called drilling position, in which each flap (40-42) is located below and in contact with the corresponding blade (10, 12),
    . a position, the so-called injection position, in which the totality of the flaps (40-42) forms a sealing belt about the lower end of the supporting tube (4),
    - pivoting means (45) pertaining to the flaps and so arranged as to cause said flaps to pivot with every axial displacement of the central injection tube (15).
  6. A hollow auger according to Claim 5, characterised in that it comprises two complementary blades (11- 12) defining a part of a winding extending over 120°, said complementary blades and the principal blade (10) being regularly arranged about the axis of the supporting tube (4).
  7. A hollow auger according to one of Claims 5 or 6, characterised in that:
    - the sealing piston (18) is endowed with an annular recess (44) opposite the supporting tube (4),
    - each flap (40-42) is mounted on an articulation spindle (43) supported by the supporting tube and so arranged as to penetrate into the annular recess (44) of the sealing piston (18),
    - the pivoting means comprise a cam (45) supported by the articulation spindle (43) of each flap (40-42), said cam being located within the annular recess (44) of the sealing piston (18) and so arranged as to be tilted by said piston in the course of the axial displacements of the central injection tube (15) so as to cause the articulation spindle (43) to rotate, said cam being so designed as to convey the flaps (40-42) either to the drilling position or to the injection position.
  8. A hollow auger according to Claim 3, characterised in that the fixed section of the rotation table (2) comprises two elements firmly connected by pivoting means (2c) so designed as to enable relative rotation of said elements with respect one another, i.e. a first element (2a) firmly connected to the translatory driving means (1, 5, 6, 7) of said rotation table and a second element (2b) bearing the rotationally mobile section (3) of said rotation table (2), the pivoting means (2c) being so designed as to enable said second element to rotate between a working position in which the supporting tube (4) extends in substantially the vertical direction and a mounting position in which said supporting tube (4) extends in substantially the horizontal direction.
  9. A hollow auger according to one of the preceding claims, characterised in that the measuring means comprise:
    - a chamber (26) filled with fluid, said chamber being arranged within the annular space (16) and communicating with the internal space of the central injection tube (15) via at least one opening sealed by a membrane (28) capable of being deformed during the injection of filling product,
    - a device (31) for measuring the fluid pressure within the chamber (26).
  10. A hollow auger according to Claim 9, characterised in that the measuring device (31) comprises a piezoelectric transducer.
  11. A hollow auger according to one of Claims 9 or 10, characterised in that the sealing piston (18) is a hollow tubular piston within which is provided the fluid chamber (26).
  12. A hollow auger according to one of Claims 1 to 8, characterised in that the measuring means comprise:
    - a disc (32) arranged within the annular space (16) between the sealing piston (18) and the end of the central injection tube (15), the so-called disc, said disc being mounted in sliding manner and restricted in its displacements by a low stop (34) integral with the central injection tube (15) and delimiting together with the sealing piston (18) an annular chamber (33) filled with fluid,
    - a device (39) for measuring the fluid pressure within the annular chamber (33).
  13. A drilling device for the production of walls from adjoining piles, characterised in that it comprises at least two augers (48-50) in accordance with one of Claims 1 to 12, said augers comprising individual rotary driving means (54-56) so designed as to drive alternate augers in inverse rotation, and common translatory driving means, said augers being aligned with their main blades (51-53) in tangential position and each comprising means (61) for regulating the output of filling product, said regulating means being so designed as to equalise the pressures at which said products are injected.
  14. A drilling device according to Claim 13, characterised in that the regulating means (61) pertaining to each auger (48-50) comprise:
    - a chamber filled with fluid communicating with the internal space of the central injection tube via at least one opening sealed by a membrane so designed as to be deformed as a function of the fluid pressure within said chamber,
    - means for adjusting the fluid pressure within the chamber, so designed as to modulate said pressure and cause deformation of the membrane with a view to variable restriction of the cross-section of the passage through the central injection tube.
  15. A drilling device according to one of Claims 13 or 14, characterised in that each auger (48-50) comprises at least one complementary blade and flaps in accordance with Claim 6, whereby at least two flaps (62- 65) pertaining to two adjacent augers (48-50) have complementary shapes so designed that in a position in which said flaps are opposite one another, the latter comprise a section overlapping the point of tangency of the main blades (51-53) of said augers.
EP19920201589 1991-06-05 1992-06-03 Hollow auger for casting piles in situ, and drilling device including at least two such augers Expired - Lifetime EP0517329B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106993 1991-06-05
FR9106993A FR2677385A1 (en) 1991-06-05 1991-06-05 DEVICE FOR INJECTING AND CONTROLLING THE CONCRETE WORKING OF PILES WITH HOLLOW TARRIES.

Publications (2)

Publication Number Publication Date
EP0517329A1 EP0517329A1 (en) 1992-12-09
EP0517329B1 true EP0517329B1 (en) 1995-09-20

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EP19920201589 Expired - Lifetime EP0517329B1 (en) 1991-06-05 1992-06-03 Hollow auger for casting piles in situ, and drilling device including at least two such augers

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EP (1) EP0517329B1 (en)
DE (1) DE69204911T2 (en)
FR (1) FR2677385A1 (en)

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FR2677385A1 (en) 1992-12-11
DE69204911T2 (en) 1996-05-30
DE69204911D1 (en) 1995-10-26
EP0517329A1 (en) 1992-12-09

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