EP0747537A1 - Drive-out drill and method for the realisation of ground screw-piles - Google Patents

Drive-out drill and method for the realisation of ground screw-piles Download PDF

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Publication number
EP0747537A1
EP0747537A1 EP96201586A EP96201586A EP0747537A1 EP 0747537 A1 EP0747537 A1 EP 0747537A1 EP 96201586 A EP96201586 A EP 96201586A EP 96201586 A EP96201586 A EP 96201586A EP 0747537 A1 EP0747537 A1 EP 0747537A1
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EP
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Prior art keywords
propeller
bulge
discharge
bore
ground
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EP96201586A
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German (de)
French (fr)
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EP0747537B1 (en
Inventor
Gerdi Willy Van Keirsbilck
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Olivier NV
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Olivier Betonfabriek en Funderingstechnieken BVBA
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/66—Mould-pipes or other moulds
    • E02D5/665—Mould-pipes or other moulds for making piles

Definitions

  • the invention relates to a discharge wick of the type which comprises a boring head and at least one propeller applied thereon, for producing a concrete screw pile in the ground.
  • screw piles should be understood here to mean both load-bearing piles as well as stop posts or even spacers.
  • Discharge wicks of this type are used during the low vibration production of piles from reinforced concrete for buildings and bridges, as well as in the vicinity of existing constructions.
  • piles or posts are formed by means of a boring duct which is provided, in its lower part, with a soil discharge wick which is constituted by a boring head hollow on which is welded a propeller whose thickness of the fins is minimal.
  • the bore assembly consisting of a steel bore pipe provided with the soil discharge drill bit is screwed into the ground by means of a drilling table comprising a compression mechanism which displaces the rotary bore pipe in steel repeatedly over a certain distance down.
  • the soil is pumped laterally and expelled by the soil discharge wick, so that an area of compressed soil is obtained around the bore pipe.
  • a steel armor is placed in the bore pipe; after which concrete is poured into the bore pipe.
  • This helical profile is obtained by screwing into the ground a bore assembly as described above, therefore consisting of a bore conduit to which a propeller is applied, and by exerting a tensile force on the assembly bore during its unscrewing back, which is such that the upward movement of the bore duct is greater than the screw pitch of the propeller.
  • the wear on the propeller is also relatively high.
  • the subject of the invention is a discharge wick with which the drawbacks mentioned above can be eliminated, as well as others, and with which, without using tensile forces when unscrewing, a pile can be shaped screw in the ground.
  • a discharge wick which comprises a bore head and at least one propeller applied to the latter, this propeller being provided, over at least part of its length, with a bulge.
  • this bulge is a local bulge and it is formed by at least one cam.
  • the propeller provided with the bulge also extends over less than one revolution.
  • the invention also relates to a method for shaping in the ground a concrete screw pile provided with a screw thread whose dimensions are such that it can be taken into account when calculating the bearing force of the pile screw, by which a bore assembly, which comprises a bore pipe and a hollow discharge drill bit which comprises a hollow bore head with lost mark, and at least one propeller applied to this bore head, is brought to the desired depth and through which concrete is poured into it, which flows into the space freed by unscrewing the assembly, the characteristic of which is that a discharge wick is used according to any one of the above embodiments.
  • the required torque can be limited.
  • the reaming mechanism according to FIG. 1 is constituted by a reaming assembly 1 which is mainly composed of a reaming pipe 2 and a delivery wick 3, and by a driving machine 4 which can be moved, which comprises a vehicle 5, for example a tracked vehicle, as well as a mast 6 mounted on the latter and a drilling table 7.
  • a reaming assembly 1 which is mainly composed of a reaming pipe 2 and a delivery wick 3, and by a driving machine 4 which can be moved, which comprises a vehicle 5, for example a tracked vehicle, as well as a mast 6 mounted on the latter and a drilling table 7.
  • the drilling table 7 can slide from top to bottom and vice versa over the mast 6 by means of a cable 8 which is driven by a massive winch.
  • a hydraulic motor having a maximum torque of 40 tonnes per meter.
  • the weight of the drilling table 7 fitted with the motor, the bore pipe 2 and the discharge wick can be compensated by the winch.
  • the mast 6 can move in all directions, so that it is also possible to perform a tilting screwing, and it is strong enough to transmit all the forces to the vehicle 5.
  • an arrow can be applied to lift the concrete tanks, a frame and the like.
  • the bore pipe 2 has an external diameter of 320 mm and a wall thickness of 20 mm. It is made up of different elements which are connected to each other using watertight couplings which are strong enough to absorb the maximum boring torque.
  • the bore pipe 2 can be provided with a funnel-shaped or tank-shaped end for filling the concrete.
  • the internal diameter of the bore pipe 2 is large enough to be able to easily place a reinforcing mesh therein.
  • the discharge wick 3 is constituted by a bore head 9 and by at least one propeller 10 on its external side.
  • the boring head 9 comprises a body 11, a lost mark 12 on the lower side of the body 11.
  • the diameter of the body 11 is greater than the diameter of the bore pipe 2 and is selected according to the diameter of the screw pile to be shaped.
  • the propeller 10 extends over a distance slightly less than one revolution to prevent an obstruction around the body 11.
  • the pitch of this propeller 10 is approximately 250 mm and its external diameter is approximately 200 mm greater than the diameter of the body 11.
  • the propeller 10 be provided with a bulge 13 over at least part of its length, which preferably extends over a short distance and over practically the entire width of the propeller 10 up to close proximity. from the outermost edge.
  • the bulge 13 is formed by at least one cam 14 and more precisely by two cams 14, one on the upper side and one opposite on the lower side of the propeller 10.
  • These cams have by example a shape as shown in detail in Figures 3 and 4, having chamfered ends and between these ends, a constant thickness.
  • the discharge wick 3 comprises a second propeller 15 which is placed above the aforementioned propeller 10 on the external side of the body 11.
  • this second propeller 15 represents roughly half a revolution and its pitch is somewhat less than that of the lower propeller 10.
  • the thickness and width of the propeller 15 which does not have a bulge 13 are less than or equal to the thickness and width of the lower propeller 10.
  • a reinforcement can be placed in the bore pipe 2 and in the hollow discharge wick 3, and the required concrete is poured into it.
  • the bulge 13 in this case a thick helix is formed in the ground which is filled with concrete, so that a concrete post is shaped with a thick screw thread around the well. After setting the concrete, a screw pile is obtained, the propeller of which can be taken into account in the calculation of the useful bearing force of the post.
  • the pitch of this screw thread amounts, for example, to approximately 250 mm, while its external diameter is approximately 200 mm greater than the diameter of the well intended for the pile.
  • the cam or cams 14 which form the bulge 13 determine the shape of the pile propeller which will be formed. This shape can be optimally adapted to the circumstances.
  • cams 14 makes it possible to give all the desired shapes to the propeller of the stake.
  • cams 14 Neither the location, nor the length, nor the thickness, nor the shape, nor the number of the cams 14 are limited to what has been described above and to what is shown in the figures.
  • the shape of the cams 14 can be adapted to the type of soil. Instead of the cams 14, teeth can be applied to the propeller 10.
  • the upper propeller 10 extends only approximately half a turn around the boring head 9, it will never have the upper hand on the lower propeller 15 so that no landslides can occur and so that mixing of the soil with fresh concrete is also avoided.
  • the combination of the lower propeller 10 provided with the cams 14 and the upper propeller 15 ensures that the soil which is between these propellers 10 and 15 is compressed by the cams 14 during the screwing back.
  • the soil which is between the propellers 10 and 15 is improved and at the same time a thicker propeller is obtained on the screw pile.
  • the cams 14 behave like a kind of adhesive and limit wear.
  • the use of one or more cams 14 only to limit wear is part of the present invention.
  • the cams 14 can be made of a very resistant metal, if they still show wear, they can be replaced without having to replace the complete propeller 10 or the complete boring head 9.
  • the shape of the propellers 10 and 15, as well as their mutual location, as well as the shape and location of the cams 14, are not subject to any limitation.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Earth Drilling (AREA)

Abstract

The drilling unit consists of a rotary head (9) with at least one spiral vane (15) which has a projection (13) at one or more points along its length. The projection extends across virtually the whole width of the spiral vane, and can be formed with the aid of one or more cams (14). The spiral on the head of the drilling unit cover at least one complete revolution and can be made in two sections, with the projection on the lower one. The upper section of the vane is shorter than the lower one and has a slightly reduced pitch. The drilling unit head is hollow and allows concrete to be poured through it after sinking into the ground to form the foundation pile.

Description

L'invention concerne une mèche de refoulement du type qui comprend une tête d'alésage et au moins une hélice appliquée sur cette dernière, pour la réalisation d'un pieu à vis en béton dans le sol.The invention relates to a discharge wick of the type which comprises a boring head and at least one propeller applied thereon, for producing a concrete screw pile in the ground.

Par l'expression "pieux à vis", on doit entendre en l'occurrence aussi bien des pieux porteurs que des poteaux d'arrêt ou encore des entretoises.The expression "screw piles" should be understood here to mean both load-bearing piles as well as stop posts or even spacers.

Des mèches de refoulement de ce type sont utilisées lors de la réalisation pauvre en vibrations de pilotis à partir de béton armé pour des bâtiments et des ponts, ainsi qu'aux abords de constructions existantes.Discharge wicks of this type are used during the low vibration production of piles from reinforced concrete for buildings and bridges, as well as in the vicinity of existing constructions.

L'utilisation de mèches de refoulement de ce type dans du sol apte à être refoulé latéralement est connue d'après les brevets belges 747.807 et 897.242.The use of discharge wicks of this type in soil capable of being pumped laterally is known from Belgian patents 747,807 and 897,242.

D'après le brevet belge 747.807, on forme des pieux ou des poteaux au moyen d'un conduit d'alésage qui est muni, dans sa partie inférieure, d'une mèche de refoulement de sol qui est constituée par une tête d'alésage creuse sur laquelle est soudée une hélice dont l'épaisseur des ailettes est minime.According to Belgian patent 747.807, piles or posts are formed by means of a boring duct which is provided, in its lower part, with a soil discharge wick which is constituted by a boring head hollow on which is welded a propeller whose thickness of the fins is minimal.

L'assemblage d'alésage constitué par un conduit d'alésage en acier muni de la mèche de refoulement de sol est vissé dans le sol au moyen d'une table de perçage comprenant un mécanisme de compression qui déplace le conduit d'alésage rotatif en acier à plusieurs reprises sur une certaine distance vers le bas.The bore assembly consisting of a steel bore pipe provided with the soil discharge drill bit is screwed into the ground by means of a drilling table comprising a compression mechanism which displaces the rotary bore pipe in steel repeatedly over a certain distance down.

Le sol est refoulé latéralement et chassé par la mèche de refoulement de sol, si bien que l'on obtient, autour du conduit d'alésage, une zone de sol comprimé.The soil is pumped laterally and expelled by the soil discharge wick, so that an area of compressed soil is obtained around the bore pipe.

Lorsqu'on a atteint la profondeur désirée, on place une armure en acier dans le conduit d'alésage; après quoi, on déverse du béton dans le conduit d'alésage.When the desired depth has been reached, a steel armor is placed in the bore pipe; after which concrete is poured into the bore pipe.

Lors du dévissage de l'assemblage d'alésage en l'actionnant dans le sens inverse, la pointe de la tête d'alésage se détache et le béton s'écoule dans l'espace créé, sous l'influence de la force de gravitation.When unscrewing the bore assembly by operating it in the opposite direction, the tip of the bore head comes off and the concrete flows into the space created, under the influence of the gravitational force .

Pour le calcul de la force portante sur base du frottement latéral du pieu en béton ainsi obtenu, seul le diamètre du puits destiné au pieu doit être pris en compte.For the calculation of the bearing force on the basis of the lateral friction of the concrete pile thus obtained, only the diameter of the well intended for the pile must be taken into account.

Dans le brevet belge 897.242, on décrit un procédé pour la réalisation dans le sol d'un pieu à vis possédant une résistance supérieure au frottement, partant une force portante supérieure suite à la présence d'un profil hélicoïdal dont les mesures sont telles qu'il peut être pris en compte lors du calcul de la force portante utile du pieu à vis.In the Belgian patent 897,242, a method is described for the production in the ground of a screw pile having a higher resistance to friction, therefore a higher bearing force following the presence of a helical profile whose measurements are such that it can be taken into account when calculating the useful bearing force of the screw pile.

On obtient ce profil hélicoïdal en vissant dans le sol un assemblage d'alésage tel que décrit ci-dessus, constitué par conséquent d'un conduit d'alésage sur lequel est appliquée une hélice, et en exerçant une force de traction sur l'assemblage d'alésage au cours de son dévissage en retour, qui est telle que le mouvement ascendant du conduit d'alésage est supérieur au pas de vis de l'hélice.This helical profile is obtained by screwing into the ground a bore assembly as described above, therefore consisting of a bore conduit to which a propeller is applied, and by exerting a tensile force on the assembly bore during its unscrewing back, which is such that the upward movement of the bore duct is greater than the screw pitch of the propeller.

Ainsi, on obtient un espace libre hélicoïdal dans le sol, qui est rempli avec du béton.Thus, we obtain a helical free space in the ground, which is filled with concrete.

Lors du dévissage de l'assemblage d'alésage, on a besoin pour ce faire d'une force très intense et on doit élaborer des machines spécifiques qui sont à même de s'adapter au procédé décrit ci-dessus.When unscrewing the bore assembly, this requires a very intense force and one must develop specific machines which are able to adapt to the process described above.

L'usure de l'hélice est également relativement importante.The wear on the propeller is also relatively high.

Le vissage dans le sol d'un conduit d'alésage muni d'une hélice épaisse nécessiterait un mécanisme d'entraînement à rotation trop importante sur la table de perçage, ainsi que la mise au point de nouvelles tables de perçage. Plus épaisse est l'hélice, plus grand est le moment de rotation requis pour visser l'assemblage d'alésage dans le sol.Screwing into the ground a reaming pipe fitted with a thick propeller would require a drive mechanism with excessive rotation on the drilling table, as well as the development of new drilling tables. The thicker the propeller, the greater the torque required to screw the bore assembly into the ground.

L'invention a pour objet une mèche de refoulement avec laquelle on peut supprimer les inconvénients mentionnés' ci-dessus, ainsi que d'autres, et avec laquelle, sans mettre en oeuvre des forces de traction lors du dévissage, on peut façonner un pieu à vis dans le sol.The subject of the invention is a discharge wick with which the drawbacks mentioned above can be eliminated, as well as others, and with which, without using tensile forces when unscrewing, a pile can be shaped screw in the ground.

Cet objet est réalisé conformément à l'invention par une mèche de refoulement qui comprend une tête d'alésage et au moins une hélice appliquée sur cette dernière, cette hélice étant munie, sur au moins une partie de sa longueur, d'un renflement.This object is produced in accordance with the invention by a discharge wick which comprises a bore head and at least one propeller applied to the latter, this propeller being provided, over at least part of its length, with a bulge.

De préférence, ce renflement est un renflement local et il est formé par au moins une came.Preferably, this bulge is a local bulge and it is formed by at least one cam.

De préférence, l'hélice munie du renflement s'étend également sur moins d'une révolution.Preferably, the propeller provided with the bulge also extends over less than one revolution.

L'invention concerne également un procédé pour le façonnement dans le sol d'un pieu à vis en béton muni d'un filet de vis dont les dimensions sont telles qu'il peut être pris en compte lors du calcul de la force portante du pieu à vis, par lequel un assemblage d'alésage, qui comprend un conduit d'alésage et une mèche creuse de refoulement qui comprend une tête d'alésage creuse à repère perdu, et au moins une hélice appliquée sur cette tête d'alésage, est amené à la profondeur désirée et par lequel on y déverse du béton qui s'écoule dans l'espace libéré par le dévissage de l'assemblage, dont la caractéristique réside dans le fait qu'on utilise une mèche de refoulement selon l'une quelconque des formes de réalisation précitées.The invention also relates to a method for shaping in the ground a concrete screw pile provided with a screw thread whose dimensions are such that it can be taken into account when calculating the bearing force of the pile screw, by which a bore assembly, which comprises a bore pipe and a hollow discharge drill bit which comprises a hollow bore head with lost mark, and at least one propeller applied to this bore head, is brought to the desired depth and through which concrete is poured into it, which flows into the space freed by unscrewing the assembly, the characteristic of which is that a discharge wick is used according to any one of the above embodiments.

Au cours du dévissage, le mouvement ascendant de l'assemblage coïncide pratiquement avec le pas de vis de l'hélice munie du renflement et on n'est confronté à aucune translation supplémentaire de la mèche de refoulement.During the unscrewing, the upward movement of the assembly practically coincides with the pitch of the propeller provided with the bulge and no additional translation of the delivery wick is encountered.

L'utilisation d'une mèche de ce type pour le refoulement du sol, dont la bride de vis présente au moins localement un renflement, est plutôt inattendue, étant donné que l'on escomptait le fait qu'un moment de rotation élevé, partant une puissance supérieure du moteur hydraulique de la table de perçage serait nécessaire pour pouvoir visser l'assemblage d'alésage dans le sol et l'en dévisser.The use of a drill bit of this type for the discharge of the ground, the screw flange of which has at least locally a bulge, is rather unexpected, since it was expected that a high torque, leaving more power from the hydraulic motor on the drilling table would be required to be able to screw the bore assembly into the ground and unscrew it.

Par une forme particulière des hélices et du renflement, en particulier sous la forme d'une ou de plusieurs cames, on peut limiter le moment de rotation requis.By a particular shape of the propellers and the bulge, in particular in the form of one or more cams, the required torque can be limited.

D'autres particularités et avantages de l'invention sont expliqués plus en détail ci-après à l'aide des dessins annexés qui représentent une forme de réalisation spécifique à titre d'exemple sans aucun caractère limitatif et dans lesquels:

  • la figure 1 représente une vue latérale d'un mécanisme d'alésage muni d'un assemblage d'alésage selon l'invention;
  • la figure 2 représente une vue latérale à plus grande échelle d'une partie de l'assemblage d'alésage provenant du mécanisme d'alésage de la figure 1;
  • la figure 3 représente une coupe transversale prise le long de la ligne III-III en figure 1, dessinée à plus grande échelle;
  • la figure 4 représente une coupe transversale prise le long de la ligne IV-IV en figure 3.
Other features and advantages of the invention are explained in more detail below with the aid of the appended drawings which represent a specific embodiment by way of example without any limiting character and in which:
  • Figure 1 shows a side view of a reaming mechanism provided with a reaming assembly according to the invention;
  • Figure 2 shows an enlarged side view of part of the bore assembly from the bore mechanism of Figure 1;
  • Figure 3 shows a cross section taken along line III-III in Figure 1, drawn on a larger scale;
  • FIG. 4 represents a cross section taken along the line IV-IV in FIG. 3.

Dans ces dessins, les mêmes chiffres de référence désignent des éléments identiques ou analogues.In these drawings, the same reference numerals denote identical or analogous elements.

Le mécanisme d'alésage selon la figure 1 est constitué par un assemblage d'alésage 1 qui est composé principalement d'un conduit d'alésage 2 et d'une mèche de refoulement 3, et par une machine d'entraînement 4 qui peut être déplacée, qui comprend un véhicule 5, par exemple un véhicule à chenilles, ainsi qu'un mât 6 monté sur ce dernier et une table de perçage 7.The reaming mechanism according to FIG. 1 is constituted by a reaming assembly 1 which is mainly composed of a reaming pipe 2 and a delivery wick 3, and by a driving machine 4 which can be moved, which comprises a vehicle 5, for example a tracked vehicle, as well as a mast 6 mounted on the latter and a drilling table 7.

La table de perçage 7 peut coulisser de haut en bas et inversement par-dessus le mât 6 au moyen d'un câble 8 qui est entraîné par un treuil massif. Sur cette table de perçage 7, est monté un moteur hydraulique possédant un couple maximal de 40 tonnes par mètre.The drilling table 7 can slide from top to bottom and vice versa over the mast 6 by means of a cable 8 which is driven by a massive winch. On this drilling table 7, is mounted a hydraulic motor having a maximum torque of 40 tonnes per meter.

Le poids de la table de perçage 7 munie du moteur, du conduit d'alésage 2 et de la mèche de refoulement peut être compensé par le treuil.The weight of the drilling table 7 fitted with the motor, the bore pipe 2 and the discharge wick can be compensated by the winch.

Le mât 6 peut se déplacer dans toutes les directions, si bien que l'on peut également effectuer un vissage en inclinaison, et il est suffisamment résistant pour transmettre toutes les forces au véhicule 5.The mast 6 can move in all directions, so that it is also possible to perform a tilting screwing, and it is strong enough to transmit all the forces to the vehicle 5.

Sur le mât 6, on peut appliquer une flèche pour soulever les cuves de béton, une armature et analogues.On mast 6, an arrow can be applied to lift the concrete tanks, a frame and the like.

Le conduit d'alésage 2 possède un diamètre externe de 320 mm et une épaisseur de paroi de 20 mm. Il est composé de différents éléments qui sont reliés l'un à l'autre à l'aide d'accouplements étanches à l'eau qui sont suffisamment résistants pour absorber le couple d'alésage maximal.The bore pipe 2 has an external diameter of 320 mm and a wall thickness of 20 mm. It is made up of different elements which are connected to each other using watertight couplings which are strong enough to absorb the maximum boring torque.

Dans sa partie supérieure, le conduit d'alésage 2 peut être muni d'une extrémité en forme d'entonnoir ou en forme de cuve pour le remplissage du béton.In its upper part, the bore pipe 2 can be provided with a funnel-shaped or tank-shaped end for filling the concrete.

Le diamètre interne du conduit d'alésage 2 est suffisamment grand pour pouvoir y placer sans problème un treillis d'armature.The internal diameter of the bore pipe 2 is large enough to be able to easily place a reinforcing mesh therein.

La mèche de refoulement 3 est constituée par une tête d'alésage 9 et par au moins une hélice 10 sur son côté externe.The discharge wick 3 is constituted by a bore head 9 and by at least one propeller 10 on its external side.

La tête d'alésage 9 comprend un corps 11, un repère perdu 12 sur le côté inférieur du corps 11.The boring head 9 comprises a body 11, a lost mark 12 on the lower side of the body 11.

Le diamètre du corps 11 est supérieur au diamètre du conduit d'alésage 2 et est sélectionné en fonction du diamètre du pieu à vis à façonner.The diameter of the body 11 is greater than the diameter of the bore pipe 2 and is selected according to the diameter of the screw pile to be shaped.

Comme indiqué dans les figures 1 et 2, l'hélice 10 s'étend sur une distance légèrement inférieure à une révolution pour empêcher une obstruction autour du corps 11.As shown in FIGS. 1 and 2, the propeller 10 extends over a distance slightly less than one revolution to prevent an obstruction around the body 11.

Le pas de vis de cette hélice 10 s'élève à environ 250 mm et son diamètre externe est d'environ 200 mm supérieur au diamètre du corps 11.The pitch of this propeller 10 is approximately 250 mm and its external diameter is approximately 200 mm greater than the diameter of the body 11.

Il est essentiel que l'hélice 10 soit munie d'un renflement 13 sur au moins une partie de sa longueur, qui s'étend de préférence sur une courte distance et sur pratiquement la largeur totale de l'hélice 10 jusqu'à proximité étroite du bord le plus externe.It is essential that the propeller 10 be provided with a bulge 13 over at least part of its length, which preferably extends over a short distance and over practically the entire width of the propeller 10 up to close proximity. from the outermost edge.

Dans l'exemple représenté, le renflement 13 est formé par au moins une came 14 et plus précisément par deux cames 14, une sur le côté supérieur et une à l'opposé sur le côté inférieur de l'hélice 10. Ces cames possèdent par exemple une forme telle que représentée en détail dans les figures 3 et 4, présentant des extrémités chanfreinées et entre ces extrémités, une épaisseur constante.In the example shown, the bulge 13 is formed by at least one cam 14 and more precisely by two cams 14, one on the upper side and one opposite on the lower side of the propeller 10. These cams have by example a shape as shown in detail in Figures 3 and 4, having chamfered ends and between these ends, a constant thickness.

Dans une forme de réalisation préférée, la mèche de refoulement 3 comprend une deuxième hélice 15 qui est placée au-dessus de l'hélice précitée 10 sur le côté externe du corps 11.In a preferred embodiment, the discharge wick 3 comprises a second propeller 15 which is placed above the aforementioned propeller 10 on the external side of the body 11.

La longueur de cette seconde hélice 15 représente à peu près une demi-révolution et son pas de vis est quelque peu inférieur à celui de l'hélice inférieure 10.The length of this second propeller 15 represents roughly half a revolution and its pitch is somewhat less than that of the lower propeller 10.

L'épaisseur et la largeur de l'hélice 15 qui ne possède pas de renflement 13 sont inférieures ou égales à l'épaisseur et à la largeur de l'hélice inférieure 10.The thickness and width of the propeller 15 which does not have a bulge 13 are less than or equal to the thickness and width of the lower propeller 10.

Pour façonner un pieu à vis dans le sol, on visse d'abord l'assemblage d'alésage 1 sans vibrations dans le sol en faisant tourner le conduit d'alésage 2 à l'aide de la table de perçage 7, tandis que l'on déplace cette table de perçage 7 par-dessus le mât 6.To shape a screw pile in the ground, we first screw the bore assembly 1 without vibrations into the ground by rotating the bore pipe 2 using the drilling table 7, while the 'We move this drilling table 7 over the mast 6.

En l'occurrence, le sol autour de la mèche de refoulement 3 est refoulé latéralement. La pression de travail exercée peut être comparée au résultat d'un sondage en profondeur.In this case, the soil around the discharge wick 3 is pushed laterally. The work pressure exerted can be compared to the result of an in-depth survey.

Après avoir vissé l'assemblage d'alésage 1 suffisamment profondément, on peut placer une armature dans le conduit d'alésage 2 et dans la mèche de refoulement creuse 3, et on y déverse le béton requis.After having screwed the bore assembly 1 deep enough, a reinforcement can be placed in the bore pipe 2 and in the hollow discharge wick 3, and the required concrete is poured into it.

Lors du vissage en retour de l'assemblage d'alésage 1 en entraînant la table de perçage 7 dans le sens contraire, le repère perdu 12 se détache du corps 11 et, par la pression hydrostatique élevée de la colonne de béton dans le conduit d'alésage 2, du béton s'écoule dans l'espace ménagé dans le sol qui se libère entre la pointe 12 qui subsiste dans le sol et le reste de la tête d'alésage 9.When screwing back the bore assembly 1 by driving the drilling table 7 in the opposite direction, the lost mark 12 is detached from the body 11 and, by the high hydrostatic pressure of the concrete column in the pipe d 'bore 2, concrete flows into the space in the ground which is released between the point 12 which remains in the ground and the rest of the bore head 9.

Au cours de ce vissage en retour, le sol est à nouveau refoulé par la mèche de refoulement 3.During this return screwing, the soil is again pushed back by the delivery wick 3.

Grâce au renflement 13, on forme en l'occurrence dans le sol une hélice épaisse qui est remplie avec du béton, si bien que l'on façonne un poteau en béton avec un filet de vis épais autour du puits. Après la prise du béton, on obtient un pieu à vis dont l'hélice peut être prise en compte dans le calcul de la force portante utile du poteau.Thanks to the bulge 13, in this case a thick helix is formed in the ground which is filled with concrete, so that a concrete post is shaped with a thick screw thread around the well. After setting the concrete, a screw pile is obtained, the propeller of which can be taken into account in the calculation of the useful bearing force of the post.

Le pas de ce filet de vis s'élève par exemple à environ 250 mm, tandis que son diamètre externe est d'environ 200 mm supérieur au diamètre du puits destiné au pieu.The pitch of this screw thread amounts, for example, to approximately 250 mm, while its external diameter is approximately 200 mm greater than the diameter of the well intended for the pile.

La ou les cames 14 qui forment le renflement 13 déterminent la forme de l'hélice du pieu qui sera formé. Cette forme peut être adaptée de manière optimale aux circonstances.The cam or cams 14 which form the bulge 13 determine the shape of the pile propeller which will be formed. This shape can be optimally adapted to the circumstances.

Le choix des cames 14 permet de conférer toutes les formes désirées à l'hélice du pieu.The choice of cams 14 makes it possible to give all the desired shapes to the propeller of the stake.

Ni la localisation, ni la longueur, ni l'épaisseur, ni la forme, ni le nombre des cames 14 ne sont limités à ce qui a été décrit ci-dessus et à ce qui est représenté dans les figures. La forme des cames 14 peut être adaptée au type de sol. Au lieu des cames 14, on peut appliquer une denture sur l'hélice 10.Neither the location, nor the length, nor the thickness, nor the shape, nor the number of the cams 14 are limited to what has been described above and to what is shown in the figures. The shape of the cams 14 can be adapted to the type of soil. Instead of the cams 14, teeth can be applied to the propeller 10.

Par le fait que le pas de vis de l'hélice supérieure 15 est inférieur au pas de vis de l'hélice inférieure 10, au cours du vissage en retour de l'assemblage d'alésage 1, une pression verticale est transmise au sol par cette hélice inférieure 10, faisant en sorte que ce sol ne se désagrège pas, ce qui représente un avantage important.By the fact that the pitch of the upper propeller 15 is less than the pitch of the lower propeller 10, during the screwing back of the bore assembly 1, a vertical pressure is transmitted to the ground by this lower propeller 10, ensuring that this soil does not fall apart, which represents an important advantage.

Etant donné que l'hélice supérieure 10 ne s'étend que sur approximativement un demi-tour autour de la tête d'alésage 9, elle n'aura jamais le dessus sur l'hélice inférieure 15 de telle sorte qu'aucun éboulement ne peut se produire et de telle sorte que l'on évite également tout mélange du sol avec le béton frais.Since the upper propeller 10 extends only approximately half a turn around the boring head 9, it will never have the upper hand on the lower propeller 15 so that no landslides can occur and so that mixing of the soil with fresh concrete is also avoided.

La combinaison de l'hélice inférieure 10 munie des cames 14 et de l'hélice supérieure 15 fait en sorte que le sol qui se trouve entre ces hélices 10 et 15 est comprimé par les cames 14 au cours du vissage en retour. Ainsi, le sol qui se trouve entre les hélices 10 et 15 est amélioré et on obtient en même temps une hélice plus épaisse sur le pieu à vis.The combination of the lower propeller 10 provided with the cams 14 and the upper propeller 15 ensures that the soil which is between these propellers 10 and 15 is compressed by the cams 14 during the screwing back. Thus, the soil which is between the propellers 10 and 15 is improved and at the same time a thicker propeller is obtained on the screw pile.

Les cames 14 se comportent comme une sorte d'adhésif et limitent l'usure. L'utilisation d'une ou de plusieurs cames 14 uniquement pour limiter l'usure fait partie de la présente invention.The cams 14 behave like a kind of adhesive and limit wear. The use of one or more cams 14 only to limit wear is part of the present invention.

Les cames 14 peuvent être réalisées en un métal très résistant, s'il advenait qu'elles manifestent malgré tout une usure, elles peuvent être remplacées sans devoir remplacer l'hélice complète 10 ou la tête d'alésage complète 9.The cams 14 can be made of a very resistant metal, if they still show wear, they can be replaced without having to replace the complete propeller 10 or the complete boring head 9.

La forme des hélices 10 et 15, ainsi que leur emplacement mutuel, tout comme la forme et l'emplacement des cames 14, ne sont soumis à aucune limitation.The shape of the propellers 10 and 15, as well as their mutual location, as well as the shape and location of the cams 14, are not subject to any limitation.

Claims (11)

Mèche de refoulement qui comprend une tête d'alésage (9) et au moins une hélice (10, 15) appliquée sur cette dernière, caractérisée en ce que l'hélice (10) est munie, sur au moins une partie de sa longueur, d'un renflement (13).Discharge wick which comprises a boring head (9) and at least one propeller (10, 15) applied to the latter, characterized in that the propeller (10) is provided, over at least part of its length, a bulge (13). Mèche de refoulement selon la revendication 1, caractérisée en ce que ce renflement (13) est un renflement local.Discharge wick according to claim 1, characterized in that this bulge (13) is a local bulge. Mèche de refoulement selon la revendication 2, caractérisée en ce que le renflement (13) s'étend sur pratiquement toute la largeur de l'hélice (10).Discharge wick according to claim 2, characterized in that the bulge (13) extends over practically the entire width of the propeller (10). Mèche de refoulement selon la revendication 2 ou 3, caractérisée en ce que le renflement (13) est formé à l'aide d'au moins une came (14)Discharge wick according to claim 2 or 3, characterized in that the bulge (13) is formed using at least one cam (14) Mèche de refoulement selon la revendication 4, caractérisée en ce que le renflement (13) est formé à l'aide de deux cames (14), une sur le côté supérieur de l'hélice (10) et une sur le côté inférieur de cette hélice (10) opposée à la première.Discharge wick according to claim 4, characterized in that the bulge (13) is formed by means of two cams (14), one on the upper side of the propeller (10) and one on the lower side of this propeller (10) opposite the first. Mèche de refoulement de sol selon l'une quelconque des revendications précédentes, caractérisée en ce que l'hélice (10), avec le renflement (13), s'étend sur moins d'une révolution autour de la tête d'alésage (9).Ground discharge drill according to any one of the preceding claims, characterized in that the propeller (10), with the bulge (13), extends over less than one revolution around the boring head (9 ). Mèche de refoulement de sol selon l'une quelconque des revendications précédentes, caractérisée en ce que deux hélices sont appliquées sur la tête d'alésage (9), l'hélice inférieure étant munie du renflement (13).Ground discharge wick according to any one of the preceding claims, characterized in that two propellers are applied to the boring head (9), the lower propeller being provided with the bulge (13). Mèche de refoulement de sol selon la revendication 7, caractérisée en ce que la longueur de l'hélice supérieure (15) est inférieure à celle de l'hélice inférieure (10), et son pas de vis est légèrement inférieur au pas de vis de l'hélice inférieure (10).Ground discharge wick according to claim 7, characterized in that the length of the upper propeller (15) is less than that of the lower propeller (10), and its pitch is slightly less than the pitch of the lower propeller (10). Mèche de refoulement selon la revendication 8, caractérisée en ce que la longueur de l'hélice supérieure (15) représente environ une demi-révolution, la largeur et l'épaisseur de l'hélice inférieure (10) étant au moins égales à celles de l'hélice supérieure (15).Discharge wick according to claim 8, characterized in that the length of the upper propeller (15) represents approximately half a revolution, the width and the thickness of the lower propeller (10) being at least equal to that of the upper propeller (15). Procédé pour le façonnement dans le sol d'un pieu à vis en béton muni d'un filet de vis dont les dimensions sont telles qu'il peut être pris en compte lors du calcul de la force portante du pieu à vis, par lequel un assemblage d'alésage (1) est amené à la profondeur désirée, qui comprend un conduit d'alésage (2) et une mèche creuse de refoulement (3) qui comprend une tête d'alésage creuse (9) à repère perdu (12), et au moins une hélice (10, 15) appliquée sur cette tête d'alésage (9), et par lequel du béton est déversé dans cet assemblage (1), qui s'écoute dans l'espace libéré par le dévissage de l'assemblage (1), caractérisé en ce qu'on utilise une mèche de refoulement (3) selon l'une quelconque des revendications 1 à 9.Method for shaping in the ground a concrete screw pile provided with a screw thread whose dimensions are such that it can be taken into account when calculating the bearing force of the screw pile, by which a bore assembly (1) is brought to the desired depth, which includes a bore pipe (2) and a hollow discharge drill bit (3) which includes a hollow bore head (9) with lost mark (12) , and at least one propeller (10, 15) applied to this boring head (9), and through which concrete is poured into this assembly (1), which is listened to in the space freed by unscrewing the 'assembly (1), characterized in that a discharge wick (3) is used according to any one of claims 1 to 9. Procédé selon la revendication 10, caractérisé en ce que, au cours du dévissage, le mouvement ascendant de l'assemblage d'alésage (1) coïncide pratiquement avec le pas de vis de l'hélice (10) munie d'un renflement (13) et on n'est confronté à aucune translation supplémentaire de la mèche de refoulement de sol (3).Method according to claim 10, characterized in that, during unscrewing, the upward movement of the bore assembly (1) coincides practically with the thread of the propeller (10) provided with a bulge (13 ) and there is no additional translation of the soil delivery wick (3).
EP96201586A 1995-06-08 1996-06-06 Drive-out drill and method for the construction of ground screw-piles Expired - Lifetime EP0747537B1 (en)

Applications Claiming Priority (2)

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BE9500504 1995-06-08
BE9500504A BE1009519A3 (en) 1995-06-08 1995-06-08 PROCESS FOR PRODUCING soil displacement piles.

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EP0747537A1 true EP0747537A1 (en) 1996-12-11
EP0747537B1 EP0747537B1 (en) 2001-05-16

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AT (1) ATE201247T1 (en)
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BE1016927A3 (en) * 2006-08-17 2007-09-04 Noterman Putboringen Nv Funder Drill for sinking concrete screw pile, has cutting screw blade with successive sections of increasing, constant and decreasing diameter in upward direction
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CN107806097A (en) * 2017-09-25 2018-03-16 江西基业科技有限公司 The outer tube of full pound type abnormity club-footed pile pile driving equipment
CN107806090A (en) * 2017-09-25 2018-03-16 江西基业科技有限公司 Shake pressing type special-shaped hidden pipe pile pile driving equipment
CN108035343A (en) * 2017-09-25 2018-05-15 江西基业科技有限公司 Full pound type abnormity pedestal pile constructing process
CN108035348A (en) * 2017-09-25 2018-05-15 江西基业科技有限公司 Shake pressing type special-shaped pipe pile settling construction method
CN108035347A (en) * 2017-09-25 2018-05-15 江西基业科技有限公司 Shake pressing type special-shaped pedestal pile constructing process
WO2021144773A1 (en) 2020-01-16 2021-07-22 Olivier Industrie Nv Soil-displacement drill and method for forming a smooth foundation pile with such a soil-displacement drill
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EP1726718A1 (en) * 2005-05-20 2006-11-29 SOILMEC S.p.A. Bit for excavation and compaction equipment for erecting piles, and excavation equipment provided with said bit
US7357199B2 (en) 2005-05-20 2008-04-15 Soilmec S.P.A. Bit for excavation and compaction equipment for erecting piles, and excavation equipment provided with said bit
BE1016927A3 (en) * 2006-08-17 2007-09-04 Noterman Putboringen Nv Funder Drill for sinking concrete screw pile, has cutting screw blade with successive sections of increasing, constant and decreasing diameter in upward direction
ITTO20090312A1 (en) * 2009-04-21 2010-10-22 Soilmec Spa EXCAVATION AND CONSTIPATION EQUIPMENT FOR CONSTRUCTION OF SCREW POLES.
EP2246479A1 (en) * 2009-04-21 2010-11-03 Soilmec S.p.A. Equipment for the construction of piles
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CN107806088A (en) * 2017-09-25 2018-03-16 江西基业科技有限公司 Shake the outer tube of pressing type special-shaped hidden pipe pile pile driving equipment
CN107806091A (en) * 2017-09-25 2018-03-16 江西基业科技有限公司 Full pound type abnormity pipe pile settling construction method
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CN107806092A (en) * 2017-09-27 2018-03-16 江西基业科技有限公司 Full pound type abnormity bull pedestal pile constructing process
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EP3973107A4 (en) * 2019-05-22 2023-03-22 Stroyer, Benjamin, G. Displacement pile and pile driver adapter
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CN114233178A (en) * 2021-12-15 2022-03-25 山东方大工程有限责任公司 Rotary excavating machine drill bit for coal mine ground engineering construction

Also Published As

Publication number Publication date
BE1009519A3 (en) 1997-04-01
EP0747537B1 (en) 2001-05-16
ATE201247T1 (en) 2001-06-15
DE69612786T2 (en) 2002-04-18
DE69612786D1 (en) 2001-06-21

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