EP1748108B1 - Auger for piling - Google Patents

Auger for piling Download PDF

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Publication number
EP1748108B1
EP1748108B1 EP06117715A EP06117715A EP1748108B1 EP 1748108 B1 EP1748108 B1 EP 1748108B1 EP 06117715 A EP06117715 A EP 06117715A EP 06117715 A EP06117715 A EP 06117715A EP 1748108 B1 EP1748108 B1 EP 1748108B1
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EP
European Patent Office
Prior art keywords
auger
core
gouge
movable
translation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06117715A
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German (de)
French (fr)
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EP1748108A1 (en
Inventor
Daniel Perpezat
Philippe Chagnot
Régis Bernazinski
Lewis Stansfield
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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Priority claimed from FR0508057A external-priority patent/FR2889241B1/en
Priority claimed from GB0607612A external-priority patent/GB2440939B/en
Application filed by Soletanche Freyssinet SA filed Critical Soletanche Freyssinet SA
Priority to PL06117715T priority Critical patent/PL1748108T3/en
Publication of EP1748108A1 publication Critical patent/EP1748108A1/en
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Publication of EP1748108B1 publication Critical patent/EP1748108B1/en
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    • 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
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes

Definitions

  • the present invention relates to a mobile pin auger.
  • the auger For the production of drilled or molded piles, it is most often used as an auger tool that allows to dig into the ground a cylindrical excavation corresponding to the dimensions of the pile to be made and which also allows the recovery of the ground dug or cut.
  • the auger is equipped with a dip tube which is slidably mounted in the hollow core of the auger and which allows to inject into the borehole, as and when the auger is raised, concrete or grout used to make the stake.
  • the forces that can absorb the molded or drilled pile depend on the one hand of the diameter of the latter and on the other hand the coefficient of friction that exists between the outer wall of the pile and the inner wall of the borehole.
  • the increase in the diameter of the pile leads to an increase in the cost of drilling and especially an increase in the amount of grout or concrete to be used to make the pile. It is therefore understood that it is advantageous, to increase the efficiency of the pile, to improve the coefficient of friction between the pile and the ground. For this, it is known to make, using a pin, a helical groove in the inner wall of the borehole which will subsequently be filled as the drilling by concrete or grout to form a helical rib penetrating into the ground .
  • the reference 10 representing the cylindrical bore
  • the reference 12 representing the inner wall of this bore
  • the reference 14 representing the helical groove formed in the wall 12 of the borehole.
  • This figure also shows the pile 16 with its helical rib 18 penetrating the soil S.
  • the lower end of the auger blade is usually equipped with a lug.
  • this lug is fixed, that is to say that it makes a groove in the direction of the descent and the ascent of the auger. This is what is described in the patent EP 1 277 887 on behalf of COMPAGNIE DU SOL.
  • COMPAGNIE DU SOL To obtain a high quality of this groove, that is to say an effective compaction of the walls of the rib, it is necessary in particular to precisely control the rotational speed and linear displacement of the auger on the descent and especially at the ascent.
  • An object of the present invention is to provide an auger equipped with a movable pin for which we can ensure the effective output of the pin during the recovery of the auger reliably and holding the pin in this position.
  • the auger is characterized in that said additional member is a tubular element extending over the entire length of the core of the auger and whose upper end is connected to a duct. a supply of pressurized liquid and the inner end of which is provided with at least one orifice for injection into the borehole
  • the auger is characterized in that said tubular element is movable in translation in said core and in that said control means causes the displacement of the lug from its retracted position to its active position. response to the translational movement of said tubular member.
  • the auger is characterized in that said tubular element is rotatable in said core and in that said control means causes the displacement of the lug from its retracted position to its active position. response to rotation of said tubular member.
  • the auger is preferably characterized in that said tubular element is a dip tube which is movable in translation in said hollow core between a retracted position in which the lower end of the dip tube closes. lower end of the auger core and an extended position in which the lower end of the dip tube protrudes out of the lower end of the auger.
  • the auger is characterized in that said additional member is a portion of tube mounted to move in translation and / or in rotation in the hollow core of the auger, at its lower end.
  • the auger is characterized in that said tube portion is mounted to move in translation inside the core of the auger and in that said control means cause the displacement of the pin from its retracted position to its active position in response to the displacement of the tube portion.
  • the auger is characterized in that said tube portion is rotatable inside the core of the auger and in that said control means cause the displacement of the pin from its retracted position to its active position in response to rotation of said tube portion.
  • the auger is characterized in that the core of said auger comprises an upper part and a lower part movable in translation relative to said upper part over a predetermined length, said lug being mounted on said lower part, in that said additional member comprises a tubular piece integral with the lower end of the upper part of said core and penetrating inside said lower part of the hollow core, and in that said control means are mounted on said tubular member such that the relative displacement in translation of said lower portion of the core and said tubular member causes the displacement of the lug from its retracted position to its active position.
  • FIG. 2 we will describe the entire drilling machine with the ergot auger.
  • the platform 20 with its articulated guide post 22 controlled symbolically by the cylinders 24.
  • the carriage 26 can be moved along the mast 22 by means not shown. It is thus possible to control on the one hand the rotational speed of the auger by means of the rotation head 28 and on the other hand the linear displacement speed of the auger by controlling the displacement of the carriage 26 with respect to the mast 22.
  • the auger 30 is constituted by a hollow cylindrical core 32 and by two helical blades 34 and 36 angularly offset by 180 degrees.
  • the core 32 ends with a point 35.
  • the leading edges 34a and 36a of the blades are equipped with teeth such as 38.
  • the additional member is a tubular piece which extends over the entire length of the core of the auger and which is preferably a dip tube.
  • the auger tubes are well known drilling machines and in particular described in the patent application FR 2,807,455 on behalf of the applicant, which should be considered an integral part of this description.
  • the auger with a hollow core in which can move in translation a so-called tube dip tube whose upper end is connected by a hose to a source of grout or cement or more generally a loaded liquid and whose Inner end may protrude out of the lower end of the auger to allow injection, through orifices, grout or concrete into the auger borehole.
  • the plunger tube can be moved in translation relative to the auger using, for example, cylinders mounted on the auger rotation head and, most often, the dip tube can also be rotated about its longitudinal axis relative to the auger.
  • the relative movement of said dip tube with respect to the auger is used to control the motor means of the mobile pin.
  • the lower part of the auger 30 is shown with its core 32, its blades 34 and 36 and its pivot pin 42.
  • a dip tube 100 whose lower end is closed by a tapered tip 102.
  • the dip tube has a plurality of orifices 104 to allow the exit of the grout or cement.
  • the plunger tube 100 is in the raised position inside the core of the auger 32, the plunger tube and the auger are integral in rotation.
  • the lower face 32a of the core 32 of the auger is provided with notches such as 106 which can cooperate with jaws 108 provided on the periphery of the lower end of the dip tube, that is to say immediately above its end 102.
  • the auger and the plunger tube are integral in rotation.
  • the plunger tube when the plunger tube is in the extended position to allow the injection of concrete, cement or grout, the lower end of the plunger tube 100 occupies a position such that the orifices 104 are disengaged and of course the jaws 108 are out of the notches 106.
  • movable pistons such as 110 are mounted in the notches 106.
  • the end 32a of the core of the auger may comprise four notches 106, in each notch two movable pistons 110 being mounted.
  • each piston 110 is constituted by a rod 112 capable of receiving the action of the claws 108 by its first end 112a while its second end 112b cooperates with a return spring 114.
  • a piston 116 mounted movably in a cylindrical chamber 118 filled with an incompressible liquid.
  • the piston 116 divides the cylinder 118 into two chambers respectively 120 and 122.
  • Each chamber is connected by a pipe 124, 126 to a control cylinder 128 and 130.
  • the control cylinders 128 and 130 act on both sides of the cylinder.
  • pivot axis 44 of the lug 42 for respectively bringing the lug in the output position or in the retracted position.
  • FIGS. 6, 7 and 8 illustrate a second embodiment of the invention.
  • a rotational movement of the dip tube relative to the auger is used to control the motor means of the movable pin.
  • an additional motor 140 which allows to cause a rotational movement of the plunger tube 100 relative to the core 32 of the auger. More specifically, this possibility of rotation is limited by two stops 142 and 144 formed at the upper end of the core 32 of the auger and by an extension 146 secured to the outer face of the upper end 100a of the dip tube.
  • the plunger tube 100 can be brought into a first position in which the extension 146 is in contact with the abutment 142 and a second position in which the extension 146 is in contact with the second abutment 144 .
  • the plunger tube 100 has a recessed portion 150 relative to its outer wall 100b which is also visible on the Figures 8A and 8B .
  • This recess portion 150 constitutes a rotary cam about the longitudinal axis X, X 'of the dip tube and the core 32 of the auger.
  • At the mobile pin 42 are mounted two pushers 152 and 154 movable in translation in holes 156 and 158 formed in the core 32 of the auger. The first ends of the pushers are in contact with the outer face of the dip tube 100 while their second ends are in contact with the control portion of the mobile pin 42 on either side of its pivot axis 44.
  • the pusher 152 In the first angular position of the dip tube 100, the pusher 152 is in contact with the outer wall 100b of the dip tube while the pusher 154 is in contact with the recess 150, which causes the mobile pin 42 to be in the extended position ( figure 8A ).
  • the second angular position it is the first pusher 152 which in contact with the recess 150, while the second pusher 154 is in contact with the outer wall 100b of the plunger tube 100. the lug 42 in its retracted position.
  • the control member essentially consists of a toothed ring 160 which surrounds the plunger tube 100 and which is free to rotate relative thereto but immobilized in vertical translation relative to the plunger tube.
  • the ring 160 is integral with a control finger 162 which penetrates into a helical slot 164 formed in the corresponding portion of the plunger tube and which constitutes a cam.
  • the helical slot formed in the dip tube is preceded by a vertical slot which is therefore without effect on the ring.
  • the toothed portion of the rotary ring 162 cooperates with a control portion 42a of the movable pin 42 which is also toothed.
  • the meshing between the toothed portion of the ring 162 and the control portion 42a of the lug 42 is via a slot 166 formed in the lower part of the hollow core 32 of the auger.
  • the relative displacements (rotation or translation) of the plunger tube with respect to the core of the auger will be used instead to detect that the lug 42 has been brought into the extended position. Indeed, these movements can easily be detected at the upper end of the auger.
  • FIG. 11A and 11B a third embodiment of the invention will be described. It corresponds to the case where the auger 30 is not equipped with a tubular element extending over the entire length of the core of the auger. The injection of grout or concrete into the borehole is then performed by feeding the hollow core 32 of the auger with this product.
  • the lower end of the auger is equipped with a moving part 170 constituted by a portion of tube 172 of reduced length relative to the length of the auger and closed at its lower end by a bottom 174 of conical shape that forms the tip of the auger.
  • the portion of tube 172 is free in translation in the hollow core of the auger and provided with orifices 176 for the outlet of the grout or concrete.
  • the movable member 170 is in the retracted position in the auger, the movable piece is rotatably secured thereto by claws 178 and notches 180 formed in the lower edge of the core 32 of the auger.
  • the moving part 170 During the descent movement of the auger, which corresponds to the digging of the borehole, the moving part 170 is held back into the core of the auger ( figure 11A ).
  • the auger when the auger is raised and a grout or concrete is injected into the hollow core thereof, the pressure of the material on the moving part 170 as well as the action of the surrounding ground cause relative movement. of translation of the moving part 170 relative to the core of the auger, the amplitude of this relative movement is limited for example by stops (not shown in the figures). This is what is represented on the Figure 11B .
  • This result can also be obtained by interposing a spring between the core of the auger and the moving part. During the descent movement of the auger, the spring is compressed. When initiating the upward movement, the spring relaxes and causes the output of the moving part.
  • This relative translation movement serves to control the pivoting of the lug 42 by motor means symbolically represented by the reference 181.
  • the control means may be of the type illustrated by the Figures 6 to 8 (hydraulic) or the type illustrated by the Figures 9 and 10 (mechanical), the tube portion 172 of the moving part replacing the dip tube.
  • the figure 12 illustrates a fourth embodiment of the invention.
  • the auger 30 is equipped with a moving part 170 slidably mounted in the hollow core 32 of the auger.
  • the difference with the third embodiment consists in the fact that the outer face of the portion of the tube 172 and the lower end of the inner face of the hollow core 32 of the auger comprise conjugate reliefs 182 capable of converting the movement relative translation of the movable part 170 relative to the core of the auger, during the ascent thereof, in a rotational movement. It is this movement that is used to control the movement of the pin 42.
  • control means symbolized by the reference 184 can then be of the type represented on the Figures 6 and 8 , the tube portion 172 replacing the dip tube.
  • the movable pin is rotated to move from its retracted position to its active or output position.
  • control means could be arranged so that the movable pin is driven in a translational movement in a radial direction relative to the axis of the soul of the auger.
  • the auger is constituted by a cutting head 220 which is mounted at the lower end of a hollow drill string, these rods being provided with an external helical blade.
  • the cutting head 220 which allows the movement of the lug 240 will be considered.
  • the movement of the lug is a movement in translation in a radial direction substantially orthogonal to the lug. longitudinal axis of the cutting head 220. It goes without saying that, by a simple modification within the reach of ordinary skill in the art, this movement could be a pivoting movement about an axis connected to the head of the art. chopped off.
  • the cutting head 220 comprises an upper portion 222 and a lower portion 224.
  • the lower end 222b of the cutting head is connected to a blade stem string by connecting means 226.
  • the lower end 222b of the part upper part is extended downwards by a tubular extension 228.
  • the upper part 222 is constituted by a cylindrical body 230 and a blade 232.
  • the lower portion 224 has the general shape of a cylindrical hollow rod 234 provided with a blade 236.
  • the extension 218 of the lower portion 222 is slidably mounted in the hollow rod 234 of the lower portion 224.
  • the lower part 224 is connected to the upper part 222 by connecting means 238.
  • the connecting means 238 rotate integrally with the parts 222 and 224 and allow a relative movement in translation of the parts 222 and 224 of limited amplitude.
  • the lower end 224a of the lower portion 224 is provided with a movable lug (or cutting tooth) 240.
  • the lug 240 is connected to displacement means 242 for moving the lug.
  • the lower end 228a of the tubular end 228 is provided with control means 244.
  • the control means 244 cooperate with the displacement means 242.
  • the lug 240 is in its retracted position shown on the figure 13 . This corresponds to the descent movement of the auger.
  • the control means 244 act on the displacement means 242 to bring the pin 240 into its output position and keep it there. This corresponds to the lift movement of the auger.
  • connection means 238 a preferred embodiment of connection means 238 will be described.
  • the upper end 234a of the hollow rod 234 is integral with a female hexagonal connection box 246.
  • the lower end 222b of the upper portion 222 is secured to the upper portion 248a of a hexagonal drive male member 248
  • the lower end 248b of the male member 248 is integral with the upper end 228b of the extension 228.
  • the male and female members 246 are integral in rotation.
  • the upper end 246a of the female member is provided with a retaining ring 250 integral with the female drive box 246 and protrudes from the inner wall 246c of the drive box 246.
  • the outer wall 248c of the male member 248 is provided with a shoulder 252 which cooperates with the retaining ring 250.
  • a protected volume 254 is limited by the blade propeller 256, a side wall 258 and a bottom plate 259.
  • a horizontal axis guide tube 260 is fixed on the rod 234 of the lower part 224.
  • the tube 260 extends radially.
  • a piston 262 is slidably mounted in this tube.
  • the lug 240 is attached to a first end 262a of the piston.
  • the second end of the piston has the shape of an inclined surface 264.
  • the lower end of the rod 234 is provided with a slot 266 in which a wedge-shaped controller 268 can move vertically.
  • the wedge 268 is attached to the lower end of the extension 228.
  • a vertical movement of the extension 228 is converted into a horizontal movement of the lug 240 by the cooperation of the surface 264 and the wedge 268.
  • a return system consisting of the lever 270 connected to the piston 262 and a return spring 272 causes the withdrawal of the lug 240.

Abstract

The auger has a hollow core (32) with an outer helical blade (34), and a movable cutter pin (42) taking an active position, where it projects outside the volume defined by the blade periphery, and a retracted position, where it is placed inside the volume. Displacement units displace the pin from retracted to active position. The displacement units have a dip tube (100), moving in translation and/or in rotation in the core, placed at the bottom end of the core. The movement of the tube relative to the bottom part of the core controls displacement of the pin from retracted to active position.

Description

La présente invention a pour objet une tarière à ergot mobile.The present invention relates to a mobile pin auger.

Pour la réalisation de pieux forés ou moulés, on utilise le plus souvent comme outil une tarière qui permet de creuser dans le sol une excavation cylindrique correspondant aux dimensions du pieu à réaliser et qui permet également la remontée du terrain creusé ou découpé. Souvent, la tarière est équipée d'un tube plongeur qui est monté coulissant dans l'âme creuse de la tarière et qui permet d'injecter dans le forage, au fur et à mesure de la remontée de la tarière, le béton ou le coulis servant à réaliser le pieu.For the production of drilled or molded piles, it is most often used as an auger tool that allows to dig into the ground a cylindrical excavation corresponding to the dimensions of the pile to be made and which also allows the recovery of the ground dug or cut. Often, the auger is equipped with a dip tube which is slidably mounted in the hollow core of the auger and which allows to inject into the borehole, as and when the auger is raised, concrete or grout used to make the stake.

Les efforts que peut absorber le pieu moulé ou foré dépendent d'une part du diamètre de celui-ci et d'autre part du coefficient de frottement qui existe entre la paroi externe du pieu et la paroi interne du forage.The forces that can absorb the molded or drilled pile depend on the one hand of the diameter of the latter and on the other hand the coefficient of friction that exists between the outer wall of the pile and the inner wall of the borehole.

L'augmentation du diamètre du pieu entraîne un accroissement du coût du forage et surtout une augmentation de la quantité de coulis ou de béton à utiliser pour réaliser le pieu. On comprend donc qu'il est intéressant, pour augmenter l'efficacité du pieu, d'améliorer le coefficient de frottement entre le pieu et le sol. Pour cela, il est connu de réaliser, à l'aide d'un ergot, une rainure hélicoïdale dans la paroi interne du forage qui sera ultérieurement remplie tout comme le forage par le béton ou le coulis pour former une nervure hélicoïdale pénétrant dans le sol.The increase in the diameter of the pile leads to an increase in the cost of drilling and especially an increase in the amount of grout or concrete to be used to make the pile. It is therefore understood that it is advantageous, to increase the efficiency of the pile, to improve the coefficient of friction between the pile and the ground. For this, it is known to make, using a pin, a helical groove in the inner wall of the borehole which will subsequently be filled as the drilling by concrete or grout to form a helical rib penetrating into the ground .

C'est ce qu'on a représenté sur la figure 1 annexée, la référence 10 représentant le forage cylindrique, la référence 12 représentant la paroi interne de ce forage, la référence 14 représentant la rainure hélicoïdale réalisée dans la paroi 12 du forage. Sur cette figure, on a également fait apparaître le pieu 16 avec sa nervure hélicoïdale 18 pénétrant dans le sol S.That's what was represented on the figure 1 attached, the reference 10 representing the cylindrical bore, the reference 12 representing the inner wall of this bore, the reference 14 representing the helical groove formed in the wall 12 of the borehole. This figure also shows the pile 16 with its helical rib 18 penetrating the soil S.

Pour réaliser la rainure hélicoïdale dans la paroi du forage, on équipe habituellement l'extrémité inférieure de la pale de la tarière d'un ergot. Dans certains cas, cet ergot est fixe, c'est-à-dire qu'il réalise une rainure dans le sens de la descente et de la remontée de la tarière. C'est ce qui est décrit dans le brevet EP 1 277 887 au nom de COMPAGNIE DU SOL. Pour obtenir une qualité élevée de cette rainure, c'est-à-dire un compactage efficace des parois de la nervure, il est nécessaire en particulier de contrôler avec précision la vitesse de rotation et de déplacement linéaire de la tarière à la descente et surtout à la remontée.To make the helical groove in the borehole wall, the lower end of the auger blade is usually equipped with a lug. In some cases, this lug is fixed, that is to say that it makes a groove in the direction of the descent and the ascent of the auger. This is what is described in the patent EP 1 277 887 on behalf of COMPAGNIE DU SOL. To obtain a high quality of this groove, that is to say an effective compaction of the walls of the rib, it is necessary in particular to precisely control the rotational speed and linear displacement of the auger on the descent and especially at the ascent.

Pour simplifier ces opérations, on a proposé d'utiliser des tarières équipées d'un ergot escamotable ne faisant saillie hors de la pale de la tarière pour réaliser la rainure que durant la remontée de la tarière. En général, la sortie de l'ergot mobile est provoquée simplement par l'inversion du sens de rotation de la tarière. Une telle solution est décrite dans le EP 1 471 187 au nom de COMPAGNIE DU SOL. Une telle solution présente l'avantage d'être simple mais elle présente l'inconvénient, dans certains cas, de ne pas assurer de façon certaine la sortie de l'ergot pour réaliser la rainure hélicoïdale.To simplify these operations, it has been proposed to use augers equipped with a retractable lug protruding out of the auger blade to make the groove only during the ascent of the auger. In general, the output of the movable pin is simply caused by the reversal of the direction of rotation of the auger. Such a solution is described in EP 1 471 187 on behalf of COMPAGNIE DU SOL. Such a solution has the advantage of being simple but it has the disadvantage, in some cases, not to ensure certain output of the pin to achieve the helical groove.

Le document WO 9 402 687 A divulgue une tanière analogue au préambule de la revendication 1.The document WO 9,402,687 A discloses a den similar to the preamble of claim 1.

Un objet de la présente invention est de fournir une tarière équipée d'un ergot mobile pour laquelle on peut assurer la sortie effective de l'ergot lors de la remontée de la tarière de façon fiable et le maintien de l'ergot dans cette position.An object of the present invention is to provide an auger equipped with a movable pin for which we can ensure the effective output of the pin during the recovery of the auger reliably and holding the pin in this position.

Pour atteindre ce but, selon l'invention, la tarière comprend :

  • une âme ;
  • au moins une pale hélicoïdale montée sur la face externe de l'âme et s'étendant sur au moins une partie substantielle de la longueur de l'âme ;
  • un ergot mobile de découpe apte à prendre une position active dans laquelle l'ergot fait saillie hors du volume limité par la périphérie de la pale et une position rentrée dans laquelle il est disposé à l'intérieur dudit volume ; et
  • des moyens pour déplacer ledit ergot de sa position rentrée à sa position active ;
ladite tarière se caractérise en ce que :
  • ladite âme de la tarière est creuse ; et
  • lesdits moyens de déplacement comprennent :
    • un organe additionnel monté mobile dans ladite âme en translation et/ou en rotation et disposé au moins à l'extrémité inférieure de ladite âme ; et
    • un moyen de commande pour provoquer le déplacement dudit ergot de sa position rentrée à sa position active en réponse au mouvement relatif dudit organe additionnel par rapport à au moins la partie inférieure de ladite âme creuse.
To achieve this object, according to the invention, the auger comprises:
  • a soul ;
  • at least one helical blade mounted on the outer face of the core and extending over at least a substantial portion of the length of the core;
  • a movable lug of cutting adapted to take an active position in which the lug protrudes out of the volume limited by the periphery of the blade and a retracted position in which it is disposed within said volume; and
  • means for moving said pin from its retracted position to its active position;
said auger is characterized in that:
  • said core of the auger is hollow; and
  • said moving means comprise:
    • an additional member movably mounted in said core in translation and / or rotation and disposed at least at the lower end of said core; and
    • control means for causing said pin to move from its retracted position to its active position in response to relative movement of said additional member with respect to at least the lower portion of said hollow core.

On comprend que le déplacement de l'ergot mobile de sa position rentrée à sa position active ou sortie est provoqué par la translation ou la rotation de l'organe additionnel. On obtient ainsi, lors de la remontée de la tarière, la sortie de l'ergot dans sa position active de façon très fiable.It is understood that the movement of the movable pin from its retracted position to its active or output position is caused by the translation or rotation of the additional member. Thus, during the recovery of the auger, the output of the pin in its active position very reliably.

Selon une première forme de mise en oeuvre, la tarière se caractérise en ce que ledit organe additionnel est un élément tubulaire s'étendant sur toute la longueur de l'âme de la tarière et dont l'extrémité supérieure est raccordée à une conduite d'alimentation en liquide chargé sous pression et dont l'extrémité intérieure est munie d'au moins un orifice pour permettre l'injection dans le forageAccording to a first embodiment, the auger is characterized in that said additional member is a tubular element extending over the entire length of the core of the auger and whose upper end is connected to a duct. a supply of pressurized liquid and the inner end of which is provided with at least one orifice for injection into the borehole

Selon un premier mode de mise en oeuvre, la tarière se caractérise en ce que ledit élément tubulaire est mobile en translation dans ladite âme et en ce que ledit moyen de commande provoque le déplacement de l'ergot de sa position rentrée à sa position active en réponse au mouvement de translation dudit élément tubulaire.According to a first mode of implementation, the auger is characterized in that said tubular element is movable in translation in said core and in that said control means causes the displacement of the lug from its retracted position to its active position. response to the translational movement of said tubular member.

Selon un deuxième mode de mise en oeuvre, la tarière se caractérise en ce que ledit élément tubulaire est mobile en rotation dans ladite âme et en ce que ledit moyen de commande provoque le déplacement de l'ergot de sa position rentrée à sa position active en réponse à la rotation dudit élément tubulaire.According to a second embodiment, the auger is characterized in that said tubular element is rotatable in said core and in that said control means causes the displacement of the lug from its retracted position to its active position. response to rotation of said tubular member.

Dans cette première forme de mise en oeuvre, de préférence, la tarière se caractérise en ce que ledit élément tubulaire est un tube plongeur qui est mobile en translation dans ladite âme creuse entre une position rentrée dans laquelle l'extrémité inférieure du tube plongeur obture l'extrémité inférieure de l'âme de la tarière et une position sortie dans laquelle l'extrémité inférieure du tube plongeur fait saillie hors de l'extrémité inférieure de la tarière.In this first embodiment, the auger is preferably characterized in that said tubular element is a dip tube which is movable in translation in said hollow core between a retracted position in which the lower end of the dip tube closes. lower end of the auger core and an extended position in which the lower end of the dip tube protrudes out of the lower end of the auger.

Selon une deuxième forme de mise en oeuvre, la tarière se caractérise en ce que ledit organe additionnel est une portion de tube montée mobile en translation et/ou en rotation dans l'âme creuse de la tarière, à son extrémité inférieure.According to a second form of implementation, the auger is characterized in that said additional member is a portion of tube mounted to move in translation and / or in rotation in the hollow core of the auger, at its lower end.

Selon un troisième mode de mise en oeuvre, la tarière se caractérise en ce que ladite portion de tube est montée mobile en translation à l'intérieur de l'âme de la tarière et en ce que lesdits moyens de commande provoquent le déplacement de l'ergot de sa position rentrée à sa position active en réponse au déplacement de la portion de tube.According to a third mode of implementation, the auger is characterized in that said tube portion is mounted to move in translation inside the core of the auger and in that said control means cause the displacement of the pin from its retracted position to its active position in response to the displacement of the tube portion.

Selon un quatrième mode de mise en oeuvre, la tarière se caractérise en ce que ladite portion de tube est mobile en rotation à l'intérieur de l'âme de la tarière et en ce que lesdits moyens de commande provoquent le déplacement de l'ergot de sa position rentrée à sa position active en réponse à la rotation de ladite portion de tube.According to a fourth mode of implementation, the auger is characterized in that said tube portion is rotatable inside the core of the auger and in that said control means cause the displacement of the pin from its retracted position to its active position in response to rotation of said tube portion.

Selon un cinquième mode de mise en oeuvre, la tarière se caractérise en ce que l'âme de ladite tarière comprend une partie supérieure et une partie inférieure mobile en translation par rapport à ladite partie supérieure sur une longueur prédéterminée, ledit ergot étant monté sur ladite partie inférieure, en ce que ledit organe additionnel comprend une pièce tubulaire solidaire de l'extrémité inférieure de la partie supérieure de ladite âme et pénétrant à l'intérieur de ladite partie inférieure de l'âme creuse, et en ce que lesdits moyens de commande sont montés sur ladite pièce tubulaire de telle manière que le déplacement relatif en translation de ladite partie inférieure de l'âme et de ladite pièce tubulaire provoque le déplacement de l'ergot de sa position rentrée à sa position active.According to a fifth mode of implementation, the auger is characterized in that the core of said auger comprises an upper part and a lower part movable in translation relative to said upper part over a predetermined length, said lug being mounted on said lower part, in that said additional member comprises a tubular piece integral with the lower end of the upper part of said core and penetrating inside said lower part of the hollow core, and in that said control means are mounted on said tubular member such that the relative displacement in translation of said lower portion of the core and said tubular member causes the displacement of the lug from its retracted position to its active position.

D'autres caractéristiques et avantages de l'invention apparaîtront mieux à la lecture de la description qui suit de plusieurs modes de réalisation de l'invention donnés à titre d'exemples non limitatifs. La description se réfère aux figures annexées, sur lesquelles :

  • la figure 1, déjà décrite, montre en coupe verticale un pieu foré obtenu à l'aide d'une tarière à ergot.
  • la figure 2 est une vue en élévation de l'ensemble de la machine de forage comportant la tarière à ergot mobile ;
  • les figures 3A et 3B montrent l'extrémité inférieure d'une tarière équipée d'un tube plongeur correspondant à un premier mode de mise en oeuvre de l'invention ;
  • la figure 4 montre en vue de dessous, l'extrémité inférieure de l'âme de la tarière selon le premier mode de mise en oeuvre de l'invention ;
  • la figure 5 montre les circuits de commande de l'ergot mobile selon le premier mode de mise en oeuvre de l'invention ;
  • la figure 6 montre l'extrémité inférieure de la tarière selon un deuxième mode de mise en oeuvre de l'invention ;
  • la figure 7 est une vue de dessus simplifiée de la tarière de la figure 6 ;
  • les figures 8A et 8B sont des vues en coupe selon la ligne XI-XI de la figure 6 montrant l'ergot en position "sortie" et en position "rentrée" ;
  • la figure 9 est une vue en coupe verticale de l'extrémité inférieure de la tarière selon une variante du premier mode de mise en oeuvre de l'invention ;
  • les figures 10A et 10B sont des vues partielles en perspective de la partie inférieure de la tarière de la figure 9 montrant l'ergot mobile dans ses deux positions ;
  • les figures 11A et 11B montrent l'extrémité inférieure de la tarière selon un troisième mode de mise en oeuvre de l'invention ;
  • la figure 12 montre l'extrémité inférieure de la tarière selon un quatrième mode de mise en oeuvre de l'invention ;
  • la figure 13 est une vue en élévation d'un cinquième mode de réalisation de l'invention ;
  • la figure 14 est une vue de côté du cinquième mode de réalisation de l'invention ;
  • la figure 15 est une vue en coupe verticale du cinquième mode de réalisation de l'invention ;
  • la figure 16 est une vue en élévation de la partie supérieure de la tête de coupe en position rentrée d'un cinquième mode de réalisation de l'invention ;
  • la figure 17 est une vue en coupe verticale selon la ligne A-A de la figure 16 ;
  • la figure 18 est une vue en coupe horizontale selon la ligne B-B de la figure 16 ;
  • la figure 19 est une vue similaire à celle de la figure 16, la tête de coupe étant en position étendue ;
  • la figure 20 est une vue en coupe verticale selon la ligne C-C de la figure 19 ;
  • la figure 21 est une vue en perspective de la partie inférieure de la tête de coupe ;
  • la figure 22 est une vue analogue à celle de la figure 21, mais en partie écorchée ; et
  • la figure 23 est une vue en coupe verticale de l'extrémité inférieure de la tête de coupe.
Other characteristics and advantages of the invention will appear better on reading the following description of several embodiments of the invention given as non-limiting examples. The description refers to the appended figures, in which:
  • the figure 1 , already described, shows in vertical section a drilled pile obtained using a hook auger.
  • the figure 2 is an elevational view of the entire drilling machine including the movable pin auger;
  • the Figures 3A and 3B show the lower end of an auger equipped with a dip tube corresponding to a first embodiment of the invention;
  • the figure 4 shows in bottom view, the lower end of the core of the auger according to the first embodiment of the invention;
  • the figure 5 shows the control circuits of the movable pin according to the first embodiment of the invention;
  • the figure 6 shows the lower end of the auger according to a second embodiment of the invention;
  • the figure 7 is a simplified top view of the auger of the figure 6 ;
  • the Figures 8A and 8B are sectional views along line XI-XI of the figure 6 showing the pin in the "out" position and in the "retracted"position;
  • the figure 9 is a vertical sectional view of the lower end of the auger according to a variant of the first embodiment of the invention;
  • the Figures 10A and 10B are partial perspective views of the lower part of the auger the figure 9 showing the movable pin in its two positions;
  • the Figures 11A and 11B show the lower end of the auger according to a third embodiment of the invention;
  • the figure 12 shows the lower end of the auger according to a fourth embodiment of the invention;
  • the figure 13 is an elevational view of a fifth embodiment of the invention;
  • the figure 14 is a side view of the fifth embodiment of the invention;
  • the figure 15 is a vertical sectional view of the fifth embodiment of the invention;
  • the figure 16 is an elevational view of the upper part of the cutting head in the retracted position of a fifth embodiment of the invention;
  • the figure 17 is a vertical sectional view along line AA of the figure 16 ;
  • the figure 18 is a horizontal sectional view along line BB of the figure 16 ;
  • the figure 19 is a view similar to that of the figure 16 the cutting head being in the extended position;
  • the figure 20 is a vertical sectional view along the line CC of the figure 19 ;
  • the figure 21 is a perspective view of the lower part of the cutting head;
  • the figure 22 is a view similar to that of the figure 21 but partly skinned; and
  • the figure 23 is a vertical sectional view of the lower end of the cutting head.

En se référant tout d'abord à la figure 2, on va décrire l'ensemble de la machine de forage comportant la tarière à ergot. Sur cette figure, on a représenté la plate-forme 20 avec son mât de guidage articulé 22 commandé de façon symbolique par les vérins 24. Le long du mât de guidage 22, peut se déplacer un chariot 26 portant la tête de mise en rotation 28 de la tarière 30. Le chariot 26 peut être déplacé le long du mât 22 par des moyens non représentés. Il est donc ainsi possible de commander d'une part la vitesse de rotation de la tarière à l'aide de la tête de mise en rotation 28 et d'autre part la vitesse de déplacement linéaire de la tarière en contrôlant le déplacement du chariot 26 par rapport au mât 22.Referring first to the figure 2 , we will describe the entire drilling machine with the ergot auger. In this figure, there is shown the platform 20 with its articulated guide post 22 controlled symbolically by the cylinders 24. Along the guide post 22, can move a carriage 26 carrying the rotating head 28 The carriage 26 can be moved along the mast 22 by means not shown. It is thus possible to control on the one hand the rotational speed of the auger by means of the rotation head 28 and on the other hand the linear displacement speed of the auger by controlling the displacement of the carriage 26 with respect to the mast 22.

La tarière 30 est constituée par une âme cylindrique creuse 32 et par deux pales hélicoïdales 34 et 36 décalées angulairement de 180 degrés. L'âme 32 se termine par une pointe 35. Les bords d'attaque 34a et 36a des pales sont équipés de dents telles que 38.The auger 30 is constituted by a hollow cylindrical core 32 and by two helical blades 34 and 36 angularly offset by 180 degrees. The core 32 ends with a point 35. The leading edges 34a and 36a of the blades are equipped with teeth such as 38.

Il va de soi qu'on ne sortirait pas de l'invention si la tarière comportait une seule pale hélicoïdale ou si cette tarière comportait une pale hélicoïdale sur toute sa hauteur et une deuxième pale sur sa partie terminale proche de la pointe 35.It goes without saying that it would not go beyond the invention if the auger had a single helical blade or if this auger had a helical blade over its entire height and a second blade on its end portion near the tip 35.

Dans la description qui suit en référence aux figures 3A à 10B, on va décrire un premier mode de mise en oeuvre de l'invention dans lequel l'organe additionnel est une pièce tubulaire qui s'étend sur toute la longueur de l'âme de la tarière et qui est de préférence un tube plongeur.In the following description with reference to Figures 3A to 10B a first embodiment of the invention will be described in which the additional member is a tubular piece which extends over the entire length of the core of the auger and which is preferably a dip tube.

Les tarières à tube plongeur sont des machines de forage bien connues et notamment décrites dans la demande de brevet FR 2 807 455 au nom du demandeur, qui doit être considérée comme faisant partie intégrante de la présente description. Dans ce cas, la tarière à une âme creuse dans laquelle peut se déplacer en translation un tube dit tube plongeur dont l'extrémité supérieure est reliée par un flexible à une source de coulis ou de ciment ou plus généralement un liquide chargé et dont l'extrémité intérieure peut faire saillie hors de l'extrémité inférieure de la tarière pour permettre l'injection, à travers des orifices, du coulis ou du béton dans le forage réalisé à l'aide de la tarière. Le tube plongeur peut être déplacé en translation par rapport à la tarière à l'aide par exemple de vérins montés sur la tête de mise en rotation de la tarière et, le plus souvent, le tube plongeur peut également être déplacé en rotation autour de son axe longitudinal par rapport à la tarière.The auger tubes are well known drilling machines and in particular described in the patent application FR 2,807,455 on behalf of the applicant, which should be considered an integral part of this description. In this case, the auger with a hollow core in which can move in translation a so-called tube dip tube whose upper end is connected by a hose to a source of grout or cement or more generally a loaded liquid and whose Inner end may protrude out of the lower end of the auger to allow injection, through orifices, grout or concrete into the auger borehole. The plunger tube can be moved in translation relative to the auger using, for example, cylinders mounted on the auger rotation head and, most often, the dip tube can also be rotated about its longitudinal axis relative to the auger.

Dans le premier mode de mise en oeuvre de l'invention, on utilise, pour commander les moyens moteurs de l'ergot mobile, le mouvement relatif en translation dudit tube plongeur par rapport à la tarière.In the first embodiment of the invention, the relative movement of said dip tube with respect to the auger is used to control the motor means of the mobile pin.

Sur les figures 3A et 3B, on a représenté la partie inférieure de la tarière 30 avec son âme 32, ses pâles 34 et 36 ainsi que son ergot pivotant 42. Dans l'âme creuse 32 est monté à coulissement un tube plongeur 100 dont l'extrémité inférieure est obturée par une pointe de forme conique 102. Le tube plongeur comporte une pluralité d'orifices 104 pour permettre la sortie du coulis ou du ciment. Lorsque le tube plongeur 100 est en position remontée à l'intérieur de l'âme de la tarière 32, le tube plongeur et la tarière sont solidaires en rotation. Pour cela la face inférieure 32a de l'âme 32 de la tarière est munie d'encoches telles que 106 qui peuvent coopérer avec des crabots 108 prévus sur la périphérie de l'extrémité inférieure du tube plongeur, c'est-à-dire immédiatement au-dessus de son extrémité 102. Ainsi, en position relevée, la tarière et le tube plongeur sont solidaires en rotation. En revanche, lorsque le tube plongeur est en position sortie pour permettre l'injection du béton, du ciment ou du coulis, l'extrémité inférieure du tube plongeur 100 occupe une position telle que les orifices 104 sont dégagés et bien entendu les crabots 108 sont sortis des encoches 106.On the Figures 3A and 3B , the lower part of the auger 30 is shown with its core 32, its blades 34 and 36 and its pivot pin 42. In the hollow core 32 is slidably mounted a dip tube 100 whose lower end is closed by a tapered tip 102. The dip tube has a plurality of orifices 104 to allow the exit of the grout or cement. When the plunger tube 100 is in the raised position inside the core of the auger 32, the plunger tube and the auger are integral in rotation. For this the lower face 32a of the core 32 of the auger is provided with notches such as 106 which can cooperate with jaws 108 provided on the periphery of the lower end of the dip tube, that is to say immediately above its end 102. Thus, in the raised position, the auger and the plunger tube are integral in rotation. On the other hand, when the plunger tube is in the extended position to allow the injection of concrete, cement or grout, the lower end of the plunger tube 100 occupies a position such that the orifices 104 are disengaged and of course the jaws 108 are out of the notches 106.

Selon ce premier mode de mise en oeuvre représenté sur les figures 3A et 3B, des pistons mobiles tels que 110 sont montés dans les encoches 106. Comme le montre mieux la figure 4, l'extrémité 32a de l'âme de la tarière peut comporter quatre encoches 106, dans chaque encoche deux pistons mobiles 110 étant montés.According to this first embodiment shown on the Figures 3A and 3B , movable pistons such as 110 are mounted in the notches 106. As best shown by the figure 4 , the end 32a of the core of the auger may comprise four notches 106, in each notch two movable pistons 110 being mounted.

On comprend que lorsque le tube plongeur est en position rentrée comme cela est représenté sur les figures 6B, les crabots 108 entrant dans les encoches 106 poussent les pistons 110. En revanche, lorsque le tube plongeur est en position sortie, aucune action n'est exercée sur le piston 110. C'est cette absence d'action sur les pistons 110 qui va être utilisée pour commander le pivotement de l'ergot mobile 42.It is understood that when the plunger tube is in the retracted position as shown in FIGS. 6B, the claws 108 entering the notches 106 push the pistons 110. On the other hand, when the plunger tube is in the extended position, no action is taken. exerted on the piston 110. It is this lack of action on the pistons 110 that will be used to control the pivoting of the mobile pin 42.

Comme le montre mieux la figure 5, chaque piston 110 est constitué par une tige 112 susceptible de recevoir l'action des crabots 108 par sa première extrémité 112a alors que sa deuxième extrémité 112b coopère avec un ressort de rappel 114. A la tige 112 est associé un piston 116 monté mobile dans une enceinte cylindrique 118 remplie d'un liquide incompressible. Le piston 116 divise le cylindre 118 en deux chambres respectivement 120 et 122. Chaque chambre est reliée par une conduite 124, 126 à un vérin de commande 128 et 130. Les vérins de commande 128 et 130 agissent de part et d'autre de l'axe de pivotement 44 de l'ergot 42 pour amener respectivement cet ergot en positon sortie ou en position rentrée.As best shown by the figure 5 each piston 110 is constituted by a rod 112 capable of receiving the action of the claws 108 by its first end 112a while its second end 112b cooperates with a return spring 114. To the rod 112 is associated a piston 116 mounted movably in a cylindrical chamber 118 filled with an incompressible liquid. The piston 116 divides the cylinder 118 into two chambers respectively 120 and 122. Each chamber is connected by a pipe 124, 126 to a control cylinder 128 and 130. The control cylinders 128 and 130 act on both sides of the cylinder. pivot axis 44 of the lug 42 for respectively bringing the lug in the output position or in the retracted position.

On comprend que lorsque le tube plongeur est en positon rentrée (figure 3B) les crabots 108 appuient sur l'extrémité 112A de la tige 112, ce qui a pour effet d'une part de comprimer le ressort de rappel 114 et d'autre part d'alimenter en liquide incompressible le vérin 128, ce qui amène l'ergot 42 en position rentrée. En revanche, lorsqu'on provoque la sortie du tube plongeur par rapport à la tarière (figure 3B), les crabots cessent d'agir sur l'extrémité 112a de la tige 112 qui est déplacée sous l'effet du ressort de rappel 114 en chassant le liquide incompressible de la chambre 120 vers le vérin 130, ce qui amène l'ergot 42 en position sortie, l'ergot étant maintenu dans cette position par le ressort de rappel 114.It is understood that when the dip tube is in the retracted position ( figure 3B ) the jaw 108 press on the end 112A of the rod 112, which has the effect of compressing the return spring 114 and secondly supply incompressible liquid cylinder 128, which leads to pin 42 in the retracted position. On the other hand, when it causes the exit of the dip tube with respect to the auger ( figure 3B ), the claws stop acting on the end 112a of the rod 112 which is moved under the effect of the return spring 114 by driving the incompressible liquid from the chamber 120 to the cylinder 130, which causes the pin 42 in the extended position, the lug being held in this position by the return spring 114.

Les figures 6, 7 et 8 illustrent un deuxième mode de réalisation de l'invention. Dans ce mode de mise en oeuvre, on utilise un mouvement de rotation du tube plongeur par rapport à la tarière pour commander les moyens moteurs de l'ergot mobile. Au niveau de la tête de mise en rotation de la tarière 30, on prévoit un moteur supplémentaire 140 qui permet de provoquer un mouvement de rotation du tube plongeur 100 par rapport à l'âme 32 de la tarière. Plus précisément, cette possibilité de rotation est limitée par deux butées 142 et 144 ménagées à l'extrémité supérieure de l'âme 32 de la tarière et par une extension 146 solidaire de la face externe de l'extrémité supérieure 100a du tube plongeur. Par rotation autour de son axe longitudinal, le tube plongeur 100 peut être amené dans une première position dans laquelle l'extension 146 est au contact de la butée 142 et une deuxième position dans laquelle l'extension 146 est au contact de la deuxième butée 144.The Figures 6, 7 and 8 illustrate a second embodiment of the invention. In this embodiment, a rotational movement of the dip tube relative to the auger is used to control the motor means of the movable pin. At the level of the rotating head of the auger 30, there is provided an additional motor 140 which allows to cause a rotational movement of the plunger tube 100 relative to the core 32 of the auger. More specifically, this possibility of rotation is limited by two stops 142 and 144 formed at the upper end of the core 32 of the auger and by an extension 146 secured to the outer face of the upper end 100a of the dip tube. By rotation about its longitudinal axis, the plunger tube 100 can be brought into a first position in which the extension 146 is in contact with the abutment 142 and a second position in which the extension 146 is in contact with the second abutment 144 .

Comme le montre mieux la figure 6, à proximité de son extrémité inférieure, le tube plongeur 100 comporte une portion en creux 150 par rapport à sa paroi extérieure 100b qui est visible également sur les figures 8A et 8B. Cette portion d'évidement 150 constitue une came rotative autour de l'axe longitudinal X, X' du tube plongeur et de l'âme 32 de la tarière. Au niveau de l'ergot mobile 42 sont montés deux poussoirs 152 et 154 mobiles en translation dans des perçages 156 et 158 ménagés dans l'âme 32 de la tarière. Les premières extrémités des poussoirs sont au contact de la face externe du tube plongeur 100 alors que leurs deuxièmes extrémités sont au contact de la partie de commande de l'ergot mobile 42 de part et d'autre de son axe de pivotement 44.As best shown by the figure 6 , near its lower end, the plunger tube 100 has a recessed portion 150 relative to its outer wall 100b which is also visible on the Figures 8A and 8B . This recess portion 150 constitutes a rotary cam about the longitudinal axis X, X 'of the dip tube and the core 32 of the auger. At the mobile pin 42 are mounted two pushers 152 and 154 movable in translation in holes 156 and 158 formed in the core 32 of the auger. The first ends of the pushers are in contact with the outer face of the dip tube 100 while their second ends are in contact with the control portion of the mobile pin 42 on either side of its pivot axis 44.

Dans la première position angulaire du tube plongeur 100, le poussoir 152 est au contact de la paroi externe 100b du tube plongeur alors que le poussoir 154 est au contact de l'évidement 150, ce qui amène l'ergot mobile 42 en position sortie (figure 8A). En revanche, pour la deuxième position angulaire, c'est le premier poussoir 152 qui au contact de l'évidement 150, alors que le deuxième poussoir 154 est au contact de la paroi externe 100b du tube plongeur 100. On obtient ainsi le maintien de l'ergot 42 dans sa position rentrée.In the first angular position of the dip tube 100, the pusher 152 is in contact with the outer wall 100b of the dip tube while the pusher 154 is in contact with the recess 150, which causes the mobile pin 42 to be in the extended position ( figure 8A ). On the other hand, for the second angular position, it is the first pusher 152 which in contact with the recess 150, while the second pusher 154 is in contact with the outer wall 100b of the plunger tube 100. the lug 42 in its retracted position.

En se référant maintenant aux figures 9, 10A et 10B, on va décrire une variante du premier mode de réalisation de l'invention.Referring now to Figures 9, 10A and 10B a variant of the first embodiment of the invention will be described.

Pour commander les déplacements de l'ergot mobile 42, on utilise le mouvement de translation verticale du tube plongeur 100 par rapport à l'âme de la tarière 32. L'organe de commande est essentiellement constitué par une bague en partie dentée 160 qui entoure le tube plongeur 100 et qui est libre en rotation par rapport à celui-ci mais immobilisé en translation verticale par rapport au tube plongeur. La bague 160 est solidaire d'un doigt de commande 162 qui pénètre dans une fente hélicoïdale 164 ménagée dans la portion correspondante du tube plongeur et qui constitue une came. En réalité, pour tenir compte de la longueur de la course relative du tube plongeur par rapport à l'âme de la tarière, la fente hélicoïdale ménagée dans le tube plongeur est précédée par une fente verticale qui est donc sans effet sur la bague. La portion dentée de la bague rotative 162 coopère avec une portion de commande 42a de l'ergot mobile 42 qui est également dentée. L'engrènement entre la partie dentée de la bague 162 et la partie de commande 42a de l'ergot 42 se fait par l'intermédiaire d'une fente 166 ménagée dans la partie inférieure de l'âme creuse 32 de la tarière.To control the movements of the movable pin 42, the vertical translation movement of the plunger tube 100 with respect to the core of the auger 32 is used. The control member essentially consists of a toothed ring 160 which surrounds the plunger tube 100 and which is free to rotate relative thereto but immobilized in vertical translation relative to the plunger tube. The ring 160 is integral with a control finger 162 which penetrates into a helical slot 164 formed in the corresponding portion of the plunger tube and which constitutes a cam. In fact, to take into account the length of the relative stroke of the dip tube relative to the core of the auger, the helical slot formed in the dip tube is preceded by a vertical slot which is therefore without effect on the ring. The toothed portion of the rotary ring 162 cooperates with a control portion 42a of the movable pin 42 which is also toothed. The meshing between the toothed portion of the ring 162 and the control portion 42a of the lug 42 is via a slot 166 formed in the lower part of the hollow core 32 of the auger.

On comprend que lorsque l'on déplace le tube plongeur 100 selon la direction verticale par rapport à l'âme de la tarière, la fente hélicoïdale 164 qui joue le rôle de came provoque la rotation dans un sens ou dans l'autre du doigt de commande 162 et donc la rotation de la bague partiellement dentée 162. La rotation de cette bague entraîne elle-même la rotation de l'ergot mobile 42 autour de son axe 44 pour l'amener soit en position rentrée comme cela est représenté sur la figure 10A, soit en position sortie comme cela est représenté sur la figure 10B.It is understood that when the plunger tube 100 is moved in the vertical direction relative to the auger core, the helical slot 164 which acts as a cam causes rotation in one direction or the other of the gripper finger. control 162 and thus the rotation of the partially toothed ring 162. The rotation of this ring itself causes the rotation of the movable pin 42 about its axis 44 to bring it in the retracted position as shown on the figure 10A , either in the extended position as shown on the figure 10B .

Comme dans le premier mode de mise en oeuvre, on peut monter sur l'axe 44 de pivotement de l'ergot 42 un capteur de rotation. Le signal délivré par ce capteur et transmis à l'ensemble de commande de la tarière permet de s'assurer que l'ergot 42 occupe effectivement la position souhaitée.As in the first embodiment, it is possible to mount on the pivot axis 44 of the lug 42 a rotation sensor. The signal delivered by this sensor and transmitted to the control assembly of the auger makes it possible to ensure that the lug 42 actually occupies the desired position.

Cependant, dans ces deux modes de mise en oeuvre, on utilisera plutôt les déplacements relatifs (rotation ou translation) du tube plongeur par rapport à l'âme de la tarière pour détecter que l'ergot 42 a bien été amené en position sortie. En effet, ces mouvements peuvent aisément être détectés à l'extrémité supérieure de la tarière.However, in these two embodiments, the relative displacements (rotation or translation) of the plunger tube with respect to the core of the auger will be used instead to detect that the lug 42 has been brought into the extended position. Indeed, these movements can easily be detected at the upper end of the auger.

En se référant maintenant aux figures 11A et 11B, on va décrire un troisième mode de mise en oeuvre de l'invention. Il correspond au cas où la tarière 30 n'est pas équipée d'un élément tubulaire s'étendant sur toute la longueur de l'âme de la tarière. L'injection de coulis ou de béton dans le forage est alors réalisée en alimentant l'âme creuse 32 de la tarière avec ce produit.Referring now to Figures 11A and 11B a third embodiment of the invention will be described. It corresponds to the case where the auger 30 is not equipped with a tubular element extending over the entire length of the core of the auger. The injection of grout or concrete into the borehole is then performed by feeding the hollow core 32 of the auger with this product.

Selon ce mode de réalisation, l'extrémité inférieure de la tarière est équipée d'une pièce mobile 170 constituée par une portion de tube 172 de longueur réduite par rapport à la longueur de la tarière et obturée à son extrémité inférieure par un fond 174 de forme conique qui forme la pointe de la tarière. La portion de tube 172 est libre en translation dans l'âme creuse de la tarière et munie d'orifices 176 pour la sortie du coulis ou du béton. De plus, lorsque la pièce mobile 170 est en position rentrée dans la tarière, la pièce mobile est solidaire en rotation de celle-ci par des crabots 178 et des encoches 180 ménagées dans le bord inférieur de l'âme 32 de la tarière.According to this embodiment, the lower end of the auger is equipped with a moving part 170 constituted by a portion of tube 172 of reduced length relative to the length of the auger and closed at its lower end by a bottom 174 of conical shape that forms the tip of the auger. The portion of tube 172 is free in translation in the hollow core of the auger and provided with orifices 176 for the outlet of the grout or concrete. In addition, when the movable member 170 is in the retracted position in the auger, the movable piece is rotatably secured thereto by claws 178 and notches 180 formed in the lower edge of the core 32 of the auger.

Lors du mouvement de descente de la tarière qui correspond au creusement du forage, la pièce mobile 170 est maintenue rentrée dans l'âme de la tarière (figure 11A). En revanche, lorsqu'on remonte la tarière et qu'on injecte un coulis ou un béton dans l'âme creuse de celle-ci, la pression du matériau sur la pièce mobile 170 ainsi que l'action du sol environnant provoquent un mouvement relatif de translation de la pièce mobile 170 par rapport à l'âme de la tarière, l'amplitude de ce mouvement relatif est limitée par exemple, par des butées (non représentées sur les figures). C'est ce qui est représenté sur la figure 11B.During the descent movement of the auger, which corresponds to the digging of the borehole, the moving part 170 is held back into the core of the auger ( figure 11A ). On the other hand, when the auger is raised and a grout or concrete is injected into the hollow core thereof, the pressure of the material on the moving part 170 as well as the action of the surrounding ground cause relative movement. of translation of the moving part 170 relative to the core of the auger, the amplitude of this relative movement is limited for example by stops (not shown in the figures). This is what is represented on the Figure 11B .

Ce résultat peut également être obtenu en interposant un ressort entre l'âme de la tarière et la pièce mobile. Lors du mouvement de descente de la tarière, le ressort est comprimé. Lorsqu'on amorce le mouvement de remontée, le ressort se détend et provoque la sortie de la pièce mobile.This result can also be obtained by interposing a spring between the core of the auger and the moving part. During the descent movement of the auger, the spring is compressed. When initiating the upward movement, the spring relaxes and causes the output of the moving part.

Ce mouvement relatif de translation sert à commander le pivotement de l'ergot 42 par des moyens moteurs représentés symboliquement par la référence 181.This relative translation movement serves to control the pivoting of the lug 42 by motor means symbolically represented by the reference 181.

Les moyens de commande peuvent être du type illustré par les figures 6 à 8 (hydraulique) ou du type illustré par les figures 9 et 10 (mécanique), la portion de tube 172 de la pièce mobile remplaçant le tube plongeur.The control means may be of the type illustrated by the Figures 6 to 8 (hydraulic) or the type illustrated by the Figures 9 and 10 (mechanical), the tube portion 172 of the moving part replacing the dip tube.

La figure 12 illustre un quatrième mode de mise en oeuvre de l'invention.The figure 12 illustrates a fourth embodiment of the invention.

Selon ce mode de mise en oeuvre, la tarière 30 est équipée d'une pièce mobile 170 montée coulissante dans l'âme creuse 32 de la tarière. La différence avec le troisième mode de réalisation consiste dans le fait que la face externe de la portion du tube 172 et l'extrémité inférieure de la face interne de l'âme creuse 32 de la tarière comportent des reliefs conjugués 182 capables de convertir le mouvement relatif de translation de la pièce mobile 170 par rapport à l'âme de la tarière, lors de la remontée de celle-ci, en un mouvement de rotation. C'est ce mouvement qui est utilisé pour commander le déplacement de l'ergot 42.According to this embodiment, the auger 30 is equipped with a moving part 170 slidably mounted in the hollow core 32 of the auger. The difference with the third embodiment consists in the fact that the outer face of the portion of the tube 172 and the lower end of the inner face of the hollow core 32 of the auger comprise conjugate reliefs 182 capable of converting the movement relative translation of the movable part 170 relative to the core of the auger, during the ascent thereof, in a rotational movement. It is this movement that is used to control the movement of the pin 42.

Les moyens de commande symbolisés par la référence 184 peuvent alors être du type représenté sur les figures 6 et 8, la portion de tube 172 remplaçant le tube plongeur.The control means symbolized by the reference 184 can then be of the type represented on the Figures 6 and 8 , the tube portion 172 replacing the dip tube.

Dans les modes de réalisation de l'invention décrits en liaison avec les figures 3 à 12, l'ergot mobile est animé d'un mouvement de rotation pour passer de sa position rentrée à sa position active ou sortie. On comprend cependant que, par des modifications à la portée de l'homme de l'art, les moyens de commande pourraient être agencés pour que l'ergot mobile soit animé d'un mouvement de translation selon une direction radiale par rapport à l'axe de l'âme de la tarière.In the embodiments of the invention described in connection with the Figures 3 to 12 , the movable pin is rotated to move from its retracted position to its active or output position. However, it will be understood that, by modifications within the scope of those skilled in the art, the control means could be arranged so that the movable pin is driven in a translational movement in a radial direction relative to the axis of the soul of the auger.

En se référant maintenant aux figures 13 à 23, on va décrire un cinquième mode de réalisation de l'invention.Referring now to Figures 13 to 23 a fifth embodiment of the invention will be described.

Dans ce mode de réalisation, la tarière est constituée par une tête de coupe 220 qui est montée à l'extrémité inférieure d'un train de tiges creuses, ces tiges étant munies d'une pale hélicoïdale externe. Dans la description qui suit, on ne considérera que la tête de coupe 220 qui permet le mouvement de l'ergot 240. Comme on le verra, le mouvement de l'ergot est un mouvement en translation selon une direction radiale sensiblement orthogonale à l'axe longitudinal de la tête de coupe 220. Il va cependant de soi que, par une modification simple à la portée de l'homme de l'art, ce mouvement pourrait être un mouvement de pivotement autour d'un axe lié à la tête de coupe.In this embodiment, the auger is constituted by a cutting head 220 which is mounted at the lower end of a hollow drill string, these rods being provided with an external helical blade. In the description which follows, only the cutting head 220 which allows the movement of the lug 240 will be considered. As will be seen, the movement of the lug is a movement in translation in a radial direction substantially orthogonal to the lug. longitudinal axis of the cutting head 220. It goes without saying that, by a simple modification within the reach of ordinary skill in the art, this movement could be a pivoting movement about an axis connected to the head of the art. chopped off.

La tête de coupe 220 comprend une partie supérieure 222 et une partie inférieure 224. L'extrémité inférieure 222b de la tête de coupe est reliée à un train de tiges à pale par des moyens de connexion 226. L'extrémité inférieure 222b de la partie supérieure est prolongée vers le bas par une extension tubulaire 228. La partie supérieure 222 est constituée par un corps cylindrique 230 et une pale 232.The cutting head 220 comprises an upper portion 222 and a lower portion 224. The lower end 222b of the cutting head is connected to a blade stem string by connecting means 226. The lower end 222b of the part upper part is extended downwards by a tubular extension 228. The upper part 222 is constituted by a cylindrical body 230 and a blade 232.

La partie inférieure 224 a la forme générale d'une tige creuse cylindrique 234 munie d'une pale 236. L'extension 218 de la partie inférieure 222 est montée coulissante dans la tige creuse 234 de la partie inférieure 224.The lower portion 224 has the general shape of a cylindrical hollow rod 234 provided with a blade 236. The extension 218 of the lower portion 222 is slidably mounted in the hollow rod 234 of the lower portion 224.

La partie inférieure 224 est reliée à la partie supérieure 222 par des moyens de connexion 238. Les moyens de connexion 238 solidarisent en rotation les parties 222 et 224 et autorisent un mouvement relatif en translation des parties 222 et 224 d'amplitude limitée.The lower part 224 is connected to the upper part 222 by connecting means 238. The connecting means 238 rotate integrally with the parts 222 and 224 and allow a relative movement in translation of the parts 222 and 224 of limited amplitude.

L'extrémité inférieure 224a de la partie inférieure 224 est munie d'un ergot mobile (ou dent de coupe) 240. L'ergot 240 est relié à des moyens de déplacement 242 pour déplacer l'ergot.The lower end 224a of the lower portion 224 is provided with a movable lug (or cutting tooth) 240. The lug 240 is connected to displacement means 242 for moving the lug.

L'extrémité inférieure 228a de l'extrémité tubulaire 228 est munie de moyens de commande 244.The lower end 228a of the tubular end 228 is provided with control means 244.

Les moyens de commande 244 coopèrent avec les moyens de déplacement 242.The control means 244 cooperate with the displacement means 242.

Comme on l'expliquera plus en détails ultérieurement, lorsque la partie supérieure 222 est en appui sur l'extrémité supérieure 224b de la partie inférieure, l'ergot 240 est dans sa position rétractée représentée sur la figure 13. Cela correspond au mouvement de descente de la tarière. Lorsque la partie supérieure 222 et la partie inférieure 224 sont écartées comme cela est représenté sur la figure 14, les moyens de commande 244 agissent sur les moyens de déplacement 242 pour amener l'ergot 240 dans sa position de sortie et l'y maintenir. Cela correspond au mouvement de remontée de la tarière.As will be explained in more detail later, when the upper portion 222 bears on the upper end 224b of the lower portion, the lug 240 is in its retracted position shown on the figure 13 . This corresponds to the descent movement of the auger. When the upper portion 222 and the lower portion 224 are spaced apart as shown in FIG. figure 14 , the control means 244 act on the displacement means 242 to bring the pin 240 into its output position and keep it there. This corresponds to the lift movement of the auger.

En se référant maintenant aux figures 16 à 20, on va décrire un mode préféré de réalisation des moyens de connexion 238.Referring now to Figures 16 to 20 a preferred embodiment of connection means 238 will be described.

Ainsi que le montrent les figures 16 à 20, l'extrémité supérieure 234a de la tige creuse 234 est solidaire d'une boîte femelle de connexion hexagonale 246. L'extrémité inférieure 222b de la partie supérieure 222 est solidaire de la partie supérieure 248a d'un organe mâle d'entraînement hexagonal 248. L'extrémité inférieure 248b de l'organe mâle 248 est solidaire de l'extrémité supérieure 228b de l'extension 228. Les organes mâle et femelle 246 sont solidaires en rotation.As shown by the Figures 16 to 20 , the upper end 234a of the hollow rod 234 is integral with a female hexagonal connection box 246. The lower end 222b of the upper portion 222 is secured to the upper portion 248a of a hexagonal drive male member 248 The lower end 248b of the male member 248 is integral with the upper end 228b of the extension 228. The male and female members 246 are integral in rotation.

L'extrémité supérieure 246a de l'organe femelle est munie d'une bague de retenue 250 solidaire de la boîte d'entraînement femelle 246 et fait saillie hors de la paroi interne 246c de la boîte d'entraînement 246. La paroi externe 248c de l'organe mâle 248 est munie d'un épaulement 252 qui coopère avec la bague de retenue 250.The upper end 246a of the female member is provided with a retaining ring 250 integral with the female drive box 246 and protrudes from the inner wall 246c of the drive box 246. The outer wall 248c of the male member 248 is provided with a shoulder 252 which cooperates with the retaining ring 250.

Lorsque la partie supérieure 222 est écartée de la partie inférieure 224, l'amplitude du déplacement est limitée par la coopération de la bague 250 et de l'épaulement 252.When the upper portion 222 is spaced from the lower portion 224, the amplitude of the displacement is limited by the cooperation of the ring 250 and the shoulder 252.

En se référant maintenant aux figures 21 à 23, on va décrire un mode préféré de réalisation des moyens de commande et de déplacement 242, 244.Referring now to Figures 21 to 23 a preferred embodiment of the control and displacement means 242, 244 will be described.

A proximité de l'extrémité inférieure 224a de la partie inférieure, un volume protégé 254 est limité par l'hélice 256 de la pale, par une paroi latérale 258 et par une plaque inférieure 259. Dans le volume 254, un tube guide 260 à axe horizontal est fixé sur la tige 234 de la partie inférieure 224. Le tube 260 s'étend radialement. Un piston 262 est monté coulissant dans ce tube. L'ergot 240 est fixé à une première extrémité 262a du piston. La deuxième extrémité du piston a la forme d'une surface inclinée 264.Near the lower end 224a of the lower part, a protected volume 254 is limited by the blade propeller 256, a side wall 258 and a bottom plate 259. In the volume 254, a horizontal axis guide tube 260 is fixed on the rod 234 of the lower part 224. The tube 260 extends radially. A piston 262 is slidably mounted in this tube. The lug 240 is attached to a first end 262a of the piston. The second end of the piston has the shape of an inclined surface 264.

L'extrémité inférieure de la tige 234 est munie d'une fente 266 dans laquelle un organe de commande en forme de coin 268 peut se déplacer verticalement. Le coin 268 est fixé sur l'extrémité inférieure de l'extension 228. Un déplacement vertical de l'extension 228 est converti en un mouvement horizontal de l'ergot 240 par la coopération de la surface 264 et du coin 268. Lorsque le coin 268 ne coopère pas avec la surface 264, un système de rappel constitué par le levier 270 relié au piston 262 et un ressort de rappel 272 provoque le retrait de l'ergot 240.The lower end of the rod 234 is provided with a slot 266 in which a wedge-shaped controller 268 can move vertically. The wedge 268 is attached to the lower end of the extension 228. A vertical movement of the extension 228 is converted into a horizontal movement of the lug 240 by the cooperation of the surface 264 and the wedge 268. When the wedge 268 does not cooperate with the surface 264, a return system consisting of the lever 270 connected to the piston 262 and a return spring 272 causes the withdrawal of the lug 240.

Le fonctionnement de ce cinquième mode de réalisation de l'invention est le suivant :

  • Lorsque la tête de coupe 220 a un mouvement de descente et de rotation pour réaliser le forage, la partie supérieure 222 est en appui sur la partie inférieure 224. L'extension 228 est en position basse dans la tige 234 de la partie inférieure 224 et le coin 268 n'agit pas sur la surface inclinée 264. L'ergot 240 est maintenu dans sa position rétractée.
  • Lorsque la tête de coupe 220 a un mouvement ascendant, les parties supérieure 222 et inférieure 224 sont écartées l'une de l'autre. Le coin 268 occupe une position haute et agit sur la surface inclinée 264 du piston 262. L'ergot 240 est amené dans sa position "sortie" et est maintenu dans cette position aussi longtemps qu'une traction est exercée sur la partie supérieure 222 de la tête de coupe.
The operation of this fifth embodiment of the invention is as follows:
  • When the cutting head 220 has a movement of descent and rotation to carry out the drilling, the upper part 222 bears on the lower part 224. The extension 228 is in the lower position in the rod 234 of the lower part 224 and the wedge 268 does not act on the inclined surface 264. The lug 240 is held in its retracted position.
  • When the cutting head 220 has an upward movement, the upper 222 and lower 224 are spaced from each other. The wedge 268 occupies a high position and acts on the inclined surface 264 of the piston 262. The lug 240 is brought into its "out" position and is held in this position as long as traction is exerted on the upper portion 222 of the cutting head.

Claims (17)

  1. An auger (30) for making a borehole that presents in its inside wall a groove (36) that is substantially helical, said auger comprising:
    - a hollow core (100) having a longitudinal axis;
    - at least one helical blade (34) mounted on the outside face of the core;
    - a movable cutter gouge (42) suitable for taking up an active position in which the gouge projects outside the volume defined by the periphery of the blade and a retracted position in which it is disposed inside said volume; and
    - displacement means (152, 154) for displacing said gouge from its retracted position to its active position;
    said auger being characterized in that:
    - said helical blade extends over at least a substantial fraction of the length of the core;
    - said displacement means comprise:
    · an additional member (150) mounted to move in said core in translation along said longitudinal axis and/or in rotation about said longitudinal axis and disposed at least at the bottom end of said core; and
    . control means (162) for causing said gouge to be displaced from its retracted position to its active position in response to said additional member moving relative to at least the bottom portion of said hollow core.
  2. An auger (30) according to claim 1, characterized in that said additional member (150) is a tubular element extending over the entire length of the core of the auger and having a top end connected to a pipe for feeding a slurry under pressure and whose bottom end is provided with at least one orifice for enabling the slurry to be injected into the borehole.
  3. An auger (30) according to claim 2, characterized in that said tubular element (150) is movable in translation in said core, and in that said control means (162) cause the gouge to be displaced from its retracted position to its active position in response to the movement in translation of said tubular element.
  4. An auger (30) according to claim 2, characterized in that said tubular element (150) is movable in rotation in said core, and in that said control means cause the gouge to be displaced from its retraced position to its active position in response to said tubular element turning.
  5. An auger (30) according to any one of claims 2 to 4, characterized in that said tubular element (150) is a dip tube which is movable in translation in said hollow core between a retracted position in which the bottom end of the dip tube closes the bottom end of the core of the auger, and an extended position in which the bottom end of the dip tube projects from the bottom end of the auger (30).
  6. An auger (30) according to claim 5, characterized in that said gouge (42) is mounted to pivot about an axis that is substantially parallel to the axis of the core (100), and in that the control means (162) comprise a movable piston (240) mounted at the bottom end of the core of the auger, occupying a first position for a first position of the dip tube relative to the core of the auger, and a second position for a second position of the dip tube (150) relative to the core of the auger, said piston in its first position feeding a first actuator that acts on the movable gouge so as to bring it into its first position, and in its second position feeding a second actuator acting on the movable gouge (42) so as to bring it into its second position.
  7. An auger (30) according to claim 5, characterized in that said gouge (42) is mounted to pivot about an axis substantially parallel to the axis of the core (100), and in that the control means (162) comprise a ring mounted to turn about the dip tube (150) and prevented from moving in translation relative to the core of the auger, said ring being secured to a control finger suitable for co-operating with a helical slot formed in the dip tube or said movable part, whereby movement in translation of the dip tube or said movable part is converted into movement in rotation of said ring, said ring including at least a portion that is toothed and suitable for co-operating with a toothed portion of the movable gouge.
  8. An auger (30) according to claim 5, characterized in that said gouge (42) is mounted to pivot about an axis substantially parallel to the axis of the core (100), and in that the dip tube (150) is movable in rotation and the control means (162) comprise a set-back portion formed in the outside face of the dip tube (150) over a fraction of its periphery, and two pushers (152, 154) slidably mounted in the core (100) of the auger (30), each pusher having a first end in contact with the outside face of the dip tube (150) or the movable part, and a second end in contact with said movable gouge (42), whereby the dip tube (150) turning relative to the core of the auger causes said pushers to be displaced so as to cause the movable gouge to pivot in one direction or the other.
  9. An auger (30) according to claim 1, characterized in that said additional member (150) is a tube segment mounted to move in translation and/or in rotation in the hollow core (100) of the auger (30), at its bottom end.
  10. An auger (30) according to claim 9, characterized in that said tube segment is mounted to move in translation inside the core (100) of the auger, and in that said control means (162) cause the gouge (42) to be displaced from its retracted position to its active position in response to the displacement of the tube segment.
  11. An auger (30) according to claim 10, characterized in that the control means (162) comprise a movable piston (240) mounted at the bottom end of the core of the auger, occupying a first position for a first position of said tube segment relative to the core of the auger, and a second position for a second position of said tube segment relative to the core of the auger, said piston (240) in its first position feeding a first actuator that acts on the movable gouge (42) to bring it into its first position, and in its second position feeding a second actuator acting on the movable gouge (42) to bring it into its second position.
  12. An auger (30) according to claim 10, characterized in that said gouge (42) is mounted to pivot about an axis substantially parallel to the axis of the core (100), and in that the control means (162) comprise a ring mounted to turn about the tube segment and prevent it from moving in translation relative to the core (100) of the auger, said ring being secured to a control finger suitable for co-operating with a helical slot formed in said movable tube segment whereby movement in translation of the tube segment or movable part is converted into movement in rotation of said ring, said ring including at least a portion that is toothed, suitable for co-operating with a toothed portion of the movable gouge.
  13. An auger (30) according to claim 9, characterized in that said tube portion is movable in rotation inside the core (100) of the auger, and in that said control means (162) cause the gouge (42) to be displaced from its retracted position to its active position in response to the movement in rotation of said tube portion.
  14. An auger (30) according to claim 10, characterized in that said gouge (42) is mounted to pivot about an axis substantially parallel to the axis of the core (100), and in that the control means (162) comprise a set-back portion formed in the outside face of the tube portion over a fraction of its periphery, and two pushers (152, 154) slidably mounted in the core (100) of the auger, each pusher having a first end in contact with the outer face of the tube segment and a second end in contact with said movable gouge, whereby the tube segment turning relative to the core of the auger causes said pushers to be displaced so as to cause the movable gouge (42) to pivot in one direction or the other.
  15. An auger (30) according to claim 1, characterized in that the core (100) of said auger (30) comprises a top portion and a bottom portion that is movable in translation relative to said top portion over a predetermined length, said gouge (42) being mounted on said bottom portion, in that said additional member (150) comprises a tubular part secured to the bottom end of the top portion of said core and penetrating inside said bottom portion of the hollow core, and in that said control means are mounted on said tubular part in such a manner that displacement of said bottom portion of the core in translation relative to said tubular part causes the gouge to be displaced from its retracted position to its active position.
  16. An auger (30) according to claim 15, characterized in that it further includes means for constraining said top and bottom portions of the core relative to each other in rotation.
  17. An auger (30) according to claim 16, characterized in that said gouge (42) is movable in translation along a radial direction.
EP06117715A 2005-07-28 2006-07-24 Auger for piling Active EP1748108B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06117715T PL1748108T3 (en) 2005-07-28 2006-07-24 Auger for piling

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0508057A FR2889241B1 (en) 2005-07-28 2005-07-28 TARIERE A MOBILE ERGOT
GB0607612A GB2440939B (en) 2006-04-18 2006-04-18 Cutting head provided with threading means

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EP1748108A1 EP1748108A1 (en) 2007-01-31
EP1748108B1 true EP1748108B1 (en) 2010-09-08

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EP06117715A Active EP1748108B1 (en) 2005-07-28 2006-07-24 Auger for piling

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EP (1) EP1748108B1 (en)
KR (1) KR101355053B1 (en)
AT (1) ATE480670T1 (en)
DE (1) DE602006016690D1 (en)
PL (1) PL1748108T3 (en)

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Also Published As

Publication number Publication date
EP1748108A1 (en) 2007-01-31
DE602006016690D1 (en) 2010-10-21
ATE480670T1 (en) 2010-09-15
PL1748108T3 (en) 2011-03-31
US20070023207A1 (en) 2007-02-01
US7591329B2 (en) 2009-09-22
KR101355053B1 (en) 2014-01-24
KR20070015015A (en) 2007-02-01

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