EP2466012B1 - Device for anchoring in multi-layer soil. - Google Patents

Device for anchoring in multi-layer soil. Download PDF

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Publication number
EP2466012B1
EP2466012B1 EP11306657.5A EP11306657A EP2466012B1 EP 2466012 B1 EP2466012 B1 EP 2466012B1 EP 11306657 A EP11306657 A EP 11306657A EP 2466012 B1 EP2466012 B1 EP 2466012B1
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EP
European Patent Office
Prior art keywords
helical
rod
diameter
disc
anchoring device
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EP11306657.5A
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German (de)
French (fr)
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EP2466012A1 (en
Inventor
Christian Meline
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Industrielle de Produits Mecaniques Ancr'est Ste
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Industrielle de Produits Mecaniques Ancr'est Ste
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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
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E02D5/801—Ground anchors driven by screwing

Definitions

  • the present invention relates to an anchoring device in a multilayer floor, of the type comprising a solid rod whose first end receives attachment means and whose opposite end free is intended to penetrate into the ground.
  • anchoring devices Two types of anchoring devices are known, each adapted to anchors in specific soils (see for example document FR-A1-2 863 633 ).
  • the anchoring, whether terrestrial or maritime, of buildings or structures may indeed be to be carried out in loose soil or floors of greater hardness.
  • screw anchoring devices comprising one or more mounted helical discs welded to a rod are provided. These anchors screw can stabilize the structure to anchor, since the thickness of the first layer of loose soil is sufficient.
  • this type of screw anchor device can not be used in layers of hard floors.
  • self-drilling anchoring devices are provided, in which the rod is provided at its end with a cutter capable of digging the soil and whose size greater than the diameter of the rod makes it possible to create a cavity. in which is injected cement to secure the anchoring with the ground.
  • Such a self-drilling device however has the disadvantage of not adapting to soils of lesser hardness.
  • the anchoring structure can be made to be made in a soil of variable hardness, composed from the surface of a first layer of loose soil, then a second monolithic layer.
  • the use of one or other of the devices mentioned above can not allow a satisfactory anchoring of the structure.
  • the first layer of loose soil is of insufficient thickness to stabilize a screw anchor, and the use of a self-drilling anchor is made impossible by the depth to which the second layer extends, the distance to the surface likely to destabilize the self-drilling anchor.
  • the self-drilling capacity of the anchoring devices used until now may be insufficient, especially in certain underwater soils, of varied grain size and mineral structure, compacted by the pressure of water and also in certain terrestrial soils of clay-limestone nature or composed of serious with hydraulic catch, presenting compactness close to the monolithic soils.
  • the present invention aims to provide an anchoring device that allows a solid anchoring in soils of variable thickness and / or different hardness, as mentioned above.
  • the invention proposes an anchoring device in a multilayer floor, of the type comprising a solid rod whose first end receives fastening means and whose opposite end free is intended to penetrate into the ground, in a positioning plate is mounted on the rod and is intended to bear on the ground surface, the rod carrying successively from the positioning plate to the free end at least one helical force disk and a helical disc penetration , characterized in that the solid rod extends after the helical penetration disk opposite the positioning plate, and in that a cutter is disposed at the free end of this rod, so that first part of the rod extends from the positioning plate to the helical penetration disk, this first part being able to be screwed into at least a first layer of soil, and so that a second part of the rod extends from the helical penetration disc to the cutter, this second part being able to be anchored in a second layer of soil.
  • Such a device allows a strong structure anchoring, the first part of the rod being intended to be screwed into a first layer of soil, for example furniture, which extends over a second layer of a soil for example monolithic and consolidated rocky type, harder than the first layer of soil, and in which the second part of the stem is able to be anchored.
  • the anchoring device as shown in all the figures, comprises a solid rod 2, a first end 21 of which receives attachment means, not shown, of a structure or a building to anchoring in the ground, the opposite end free 22 of the solid rod 2 being for this purpose intended to penetrate into the ground.
  • This structure is brought to be fixed relative to the ground, whether in a land or sea application.
  • This anchoring device is of particular interest in the case of an anchoring ground formed of several layers of distinct compositions, and in particular a floor, in which a first layer 31 is formed of a thickness of loose material, by example of sand, gravel and generally non-consolidated materials, this first layer 31 resting on a second layer 32 formed of hardened rocks, limestones or concretes and generally of monolithic or consolidated materials.
  • the rod 2 has, at a determined distance from the ends, a helical penetration disk 8, a first portion 23 of the rod 2 extending between the first fastening end 21 and this helical penetration disk 8, while a second portion 24 of the rod 2 extends between the helical penetration disk 8 and the free end 22 of drilling.
  • the first portion 23 of the rod 2 is, as shown in the figures, adapted to be screwed at least in the first layer of soil 31, and the second portion 24 of the rod 2 is adapted to be anchored, by drilling of the end of the rod 2, in the second layer of soil 32.
  • a positioning plate 5 is mounted on the solid rod 2 and is intended to bear on the ground surface, while the helical penetration disk 8 is disposed on the rod 2 at a predetermined length of this positioning plate 5 so that the helical penetration disk 8 rests on the upper part of the second layer of harder soil 32.
  • a soil analysis prior to drilling makes it possible to determine the size of the first layer of soil 31, and thus to determine at what distance from the positioning plate 5 the helical penetration disk 8 must be arranged on the rod 2.
  • the positioning plate 5 is not necessary for example for anchoring in underwater soils.
  • the first portion 23 of the rod 2 comprises at least one helical disk 6 effort whose function is to penetrate by screwing in the first layer of loose soil 31.
  • it can be provided several helical disks force 6.
  • the number of helical disks to provide on the rod 2 depends on the density of the soil in which the rod must be anchored.
  • the increase in the number of helical force disks increases the anchoring effort of the device.
  • the diameter of the selected discs is determined to avoid that torques of recovery efforts are too important.
  • the distance between two helical disks force 6 depends on the diameter of the disks. This distance between two discs is between two and five times the diameter of the disc, and advantageously between three and four times this diameter.
  • the helical disks force 6 extend over the first portion 23 of the rod 2, between the helical penetration disk 8 and the positioning plate 5. So that the helical disks force 6 are engaged with the first layer of soil 31, the diameter of the helical penetration disk 8, brought to penetrate the ground before the helical disks force 6, must be equal to or smaller than the diameters of the helical disks effort 6.
  • spiral disks effort 6 diameter equivalent to each other it will be understood that in accordance with what has been written above, the diameters of each helical disk force 6 could vary, since a decrease in the diameter of the helical disks effort 6 is respected, the helical disk effort 6 closest to the positioning plate 5 to the helical disk 6
  • These helical disks force 6 may advantageously have an incoming portion of beveled primer, and reinforced by a filler metal.
  • these helicoidal disks 6 and penetration 8 can be made of high-strength steel. The spiral disks 6 and penetration force 8 are welded to the rod 2.
  • the rod 2 extends in a second portion 24, after the helical penetration disk 8 opposite the positioning plate 5.
  • a cutting 4 is disposed at the free end 22 of This rod 2
  • This self-drilling cutter 4 is welded or screwed at the end of the rod 2, and has the rigidity characteristics necessary to be able to drill in a second layer of soil 32, made of consolidated or monolithic material.
  • the second portion 24 of the rod 2 will thus participate in fixing the structure by anchoring in the ground, following the drilling performed by the cutter 4.
  • the length of the second portion 24 of the rod 2 is then chosen to achieve this anchoring over a sufficient length to stabilize the anchoring device.
  • a connecting sleeve can be used to increase the total length of the rod and thus the depth of penetration into the ground.
  • Such a device allows a strong structure anchoring, the first portion 23 of the rod 2 being intended to be screwed into at least a first layer of loose soil 31, which extends over a second layer 32 of a monolithic soil and consolidated , harder than the first layer of soil 31, and wherein the second portion 24 of the rod 2 is adapted to be anchored.
  • the drill end of the rod provided with the cutter, initially digs the first layer of loose soil, and shapes a borehole which facilitates the screwing action of the helical discs penetration and effort in this first layer.
  • the cutter 4 disposed at the free end of the rod 2 has a diameter equal to or greater than the diameter of the second portion 24 of this rod 2.
  • the drilling of the ground by the cutting 4 then generates a cavity 12 in which extends, following the cut 4, the second portion 24 of the rod 2.
  • a cylindrical casing 40 is formed around the first portion 23 of the solid rod 2 between the positioning plate 5 and the helical penetration disk 8 and this casing 40 has a variable diameter.
  • variable diameter of the cylindrical envelope 40 varies between a large diameter and a small diameter which is greater than the diameter of the second portion 24 of the rod 2.
  • the cylindrical casing 40 comprises a first section 41 extending from the positioning plate 5 and having a first diameter d1 followed by a second section 42 extending to the helical penetration disk 8 and having a second diameter d2 less than the first diameter d1 and greater than the diameter d3 of the second portion 24 of the rod 2.
  • the sections 41 and 42 of the cylindrical envelope 40 are welded together and they support helical disks of effort 6.
  • the solid rod 23 threaded or smooth form the main resistance column and allows all types of attachment in the upper part as well as the connections with a device for injecting cement or synthetic resin.
  • the anchoring device shown in these figures has a higher self-drilling capacity than the devices previously described and it can be used in particular in certain underwater soils, of varying grain size and mineral structure, compacted by the pressure of water and also in some terrestrial soils of clay-limestone nature or composed of serious with hydraulic catch, presenting compacities close to the monolithic soils.
  • the anchoring device is formed by a solid rod 2 threaded over its entire length between the two ends 21 and 22.
  • the end 22 of the rod 2 is provided with a cutter 4.
  • the helical disk stress 6 the closer to the cutter 4 has an outside diameter greater than the outside diameter of the helical penetration disk 8.
  • the rod 2 carries in its second part 24 between the helical disk of effort 6 closest to the cutter 4 and the helical disk penetration 8 at least one disk intermediate spiral 50 of outer diameter between the outer diameters of the helical disks, respectively of force 6 and penetration 8.
  • the helicoidal intermediate disc 50 is formed by at least one discontinuous spiral 51 welded to the rod 2.
  • a plurality of discontinuous spirals 51 may be interposed in the space delimited by the helical force disk 6 and the helical penetration disk 8, these discontinuous spirals being interposed in a variable or constant pitch and the diameter of these discontinuous spirals. being inscribed in a frustoconical envelope whose large base is the diameter of the helical disk of force 6 and the small base, the diameter of the helical disc of penetration 8.
  • the intermediate helical disk 50 is formed by a conical spiral 52 continuous connecting the helical disks, respectively of force 6 and penetration 8.
  • This continuous spiral 52 is inscribed in a frustoconical envelope whose large base is determined by the outer diameter of the spiral helical disk 6 and the small base is determined by the outside diameter of the helical disk penetration 8.
  • a cylindrical envelope 40 having a variable diameter and disposed around the first portion 23 of the solid rod 2 and the helical disk effort 6 closest to the cutter 4.
  • This cylindrical envelope 40 is identical to that described for the mode of realization represented at figure 5 .
  • the helical force disk 6 closest to the cutter 4 also has an outside diameter greater than the outside diameter of the helical penetration disk 8 and the rod 2 carries between this helical disk 6 and this drive disk helical helix 8 at least one intermediate helical disc 50 of outer diameter between the outer diameters of the helical disks, respectively of force 6 and penetration 8.
  • said at least one intermediate helical disk 50 is formed by a discontinuous spiral 51 identical to the discontinuous spiral of the embodiment shown in FIG. figure 3 .
  • said at least one intermediate helical disk is formed by a continuous conical spiral 52 identical to that of the embodiment shown in FIG. figure 4 .
  • the solid rod 2 forming the anchoring device has a constant diameter over the entire length of the anchoring device.
  • a rod 2 of constant diameter allows a simplified industrialization of the anchoring device, but could be replaced in a variant by a rod of variable diameter.
  • the diameter of the parts of the rod 2 not covered with a cylindrical envelope 20 or 40 could be greater than the diameter of the parts of the rod surrounded by said envelope 20 or 40.
  • rod 2 full threaded. It will be understood that this rod can be threaded or smooth, and for example have a mixed profile.
  • the rod 2 may be threaded on the second portion 24 extending between the penetration disc 8 and the cutter 4, and this rod 2 may be smooth in the portion 23 surrounded by the cylindrical envelope 20 or 40.
  • Such an anchoring device allows the fixation of structure or building in soils with layers of different compositions.
  • the anchoring device is set up by screwing using a rotary hammer, supported by a drill arm or by a submerged installation according to the terrestrial or marine application envisaged.
  • the device can then extend in these successive layers in a strictly vertical manner as shown, or with a different orientation without departing from the context of the invention, since the cutting edge and the second part of the rod are anchored in a second layer of monolithic or consolidated soil, or furniture, and since this second layer is covered with at least a first layer of loose soil, and that the first part of the stem and the associated disks are screwed into at least the first layer of loose soil.
  • Such a mixed anchoring device combining the characteristics of anchoring by drilling and screwing, by means of a single rod, makes it possible to take into account, in a single device, all the anchoring forces, know the efforts of extraction and bending on the one hand, and compression and buckling on the other hand.
  • the mixed anchoring device according to the invention is able to withstand various stresses and mainly bending forces by reinforcing the upper diameter of the solid rod 2.
  • the bending forces are generated by variable forces with an orientation between 0 and 90 °.

Description

La présente invention concerne un dispositif d'ancrage dans un sol multicouches, du type comportant une tige pleine dont une première extrémité reçoit des moyens d'attache et dont l'extrémité opposée libre est destinée à pénétrer dans le sol.The present invention relates to an anchoring device in a multilayer floor, of the type comprising a solid rod whose first end receives attachment means and whose opposite end free is intended to penetrate into the ground.

On connaît deux types de dispositifs d'ancrage, adaptés chacun à des ancrages dans des sols spécifique (voir par exemple document FR-A1-2 863 633 ). L'ancrage, qu'il soit terrestre ou maritime, d'édifices ou de structures peut en effet être à effectuer dans des sols meubles ou des sols de plus grande dureté. Il est ainsi prévu dans le cas de sols meubles, des dispositifs d'ancrage à vis, comportant un ou plusieurs disques hélicoïdaux rapportés soudés sur une tige. Ces ancres à vis peuvent ainsi stabiliser la structure à ancrer, dès lors que l'épaisseur de la première couche de sol meuble est suffisante.Two types of anchoring devices are known, each adapted to anchors in specific soils (see for example document FR-A1-2 863 633 ). The anchoring, whether terrestrial or maritime, of buildings or structures may indeed be to be carried out in loose soil or floors of greater hardness. Thus, in the case of loose soil, screw anchoring devices comprising one or more mounted helical discs welded to a rod are provided. These anchors screw can stabilize the structure to anchor, since the thickness of the first layer of loose soil is sufficient.

Outre ce premier problème lié à l'environnement dans lequel doit être utilisé ce type de dispositif, un autre inconvénient est que ce type de dispositif d'ancrage à vis ne peut être utilisé dans des couches de sols durs. Il est prévu dans le cas de ces sols durs des dispositifs d'ancrage autoforants, dans lesquels la tige est munie à son extrémité d'un taillant apte à creuser le sol et dont la dimension supérieure au diamètre de la tige permet de créer une cavité dans laquelle est injecté du ciment pour solidariser l'ancrage avec le sol. Un tel dispositif autoforant présente toutefois l'inconvénient de ne pas s'adapter à des sols de moindre dureté.In addition to this first problem related to the environment in which this type of device must be used, another disadvantage is that this type of screw anchor device can not be used in layers of hard floors. In the case of these hard floors, self-drilling anchoring devices are provided, in which the rod is provided at its end with a cutter capable of digging the soil and whose size greater than the diameter of the rod makes it possible to create a cavity. in which is injected cement to secure the anchoring with the ground. Such a self-drilling device however has the disadvantage of not adapting to soils of lesser hardness.

Or, l'ancrage de structure peut être amené à être réalisé dans un sol de dureté variable, composé depuis la surface d'une première couche de sol meuble, puis d'une deuxième couche monolithique. L'utilisation de l'un ou l'autre des dispositifs évoqués ci-dessus ne peut permettre un ancrage satisfaisant de la structure. La première couche de sol meuble est d'une épaisseur insuffisante pour stabiliser un dispositif d'ancrage à vis, et l'utilisation d'un ancrage autoforant est rendu impossible par la profondeur à laquelle s'étend la deuxième couche, la distance à la surface risquant de déstabiliser l'ancrage autoforant.Now, the anchoring structure can be made to be made in a soil of variable hardness, composed from the surface of a first layer of loose soil, then a second monolithic layer. The use of one or other of the devices mentioned above can not allow a satisfactory anchoring of the structure. The first layer of loose soil is of insufficient thickness to stabilize a screw anchor, and the use of a self-drilling anchor is made impossible by the depth to which the second layer extends, the distance to the surface likely to destabilize the self-drilling anchor.

De plus, la capacité auto-forante des dispositifs d'ancrage utilisés jusqu'à présent peut s'avérer insuffisante notamment dans certains sols sous-marins, de granulométrie et de structure minérale variée, compactés par la pression de l'eau et également dans certains sols terrestres de nature argilo-calcaire ou composés de graves à prise hydraulique, présentant des compacités proches des sols monolithiques.In addition, the self-drilling capacity of the anchoring devices used until now may be insufficient, especially in certain underwater soils, of varied grain size and mineral structure, compacted by the pressure of water and also in certain terrestrial soils of clay-limestone nature or composed of serious with hydraulic catch, presenting compactness close to the monolithic soils.

La présente invention vise à proposer un dispositif d'ancrage qui permette un ancrage solide dans des sols à épaisseurs variables et/ou de duretés différentes, tel qu'évoqué ci-dessus.The present invention aims to provide an anchoring device that allows a solid anchoring in soils of variable thickness and / or different hardness, as mentioned above.

A cet effet, l'invention propose un dispositif d'ancrage dans un sol multicouches, du type comportant une tige pleine dont une première extrémité reçoit des moyens d'attaches et dont l'extrémité opposée libre est destinée à pénétrer dans le sol, dans lequel une platine de positionnement est montée sur la tige et est destinée à prendre appui sur la surface du sol, la tige portant successivement depuis la platine de positionnement vers l'extrémité libre au moins un disque hélicoïdal d'effort puis un disque hélicoïdal de pénétration, caractérisé en ce que la tige pleine s'étend après le disque hélicoïdal de pénétration à l'opposé de la platine de positionnement, et en ce qu'un taillant est disposé à l'extrémité libre de cette tige, de sorte qu'une première partie de la tige s'étend de la platine de positionnement au disque hélicoïdal de pénétration, cette première partie étant apte à être vissée dans au moins une première couche de sol, et de sorte qu'une deuxième partie de la tige s'étend du disque hélicoïdal de pénétration au taillant, cette deuxième partie étant apte à être ancrée dans une deuxième couche de sol.To this end, the invention proposes an anchoring device in a multilayer floor, of the type comprising a solid rod whose first end receives fastening means and whose opposite end free is intended to penetrate into the ground, in a positioning plate is mounted on the rod and is intended to bear on the ground surface, the rod carrying successively from the positioning plate to the free end at least one helical force disk and a helical disc penetration , characterized in that the solid rod extends after the helical penetration disk opposite the positioning plate, and in that a cutter is disposed at the free end of this rod, so that first part of the rod extends from the positioning plate to the helical penetration disk, this first part being able to be screwed into at least a first layer of soil, and so that a second part of the rod extends from the helical penetration disc to the cutter, this second part being able to be anchored in a second layer of soil.

Un tel dispositif permet un ancrage de structure résistant, la première partie de la tige étant destinée à être vissée dans une première couche de sol, par exemple meuble, qui s'étend sur une deuxième couche d'un sol par exemple monolithique et consolidé de type rocheux, plus dur que la première couche de sol, et dans laquelle la deuxième partie de la tige est apte à être ancrée.Such a device allows a strong structure anchoring, the first part of the rod being intended to be screwed into a first layer of soil, for example furniture, which extends over a second layer of a soil for example monolithic and consolidated rocky type, harder than the first layer of soil, and in which the second part of the stem is able to be anchored.

Selon différentes caractéristiques de la présente invention :

  • le taillant présente un diamètre égal ou supérieur au diamètre de la tige ;
  • le au moins un disque hélicoïdal d'effort et le disque hélicoïdal de pénétra- tion sont soudés sur la tige ;
  • une enveloppe cylindrique est formée autour de la première partie de la tige, entre la platine de positionnement et le disque hélicoïdal d'effort le plus proche de la platine ;
  • une enveloppe cylindrique est formée autour de la première partie de la tige, entre la platine de positionnement et le disque hélicoïdal de pénétration,
  • l'enveloppe cylindrique présente un diamètre variable dont le plus petit diamètre est supérieur au diamètre de la deuxième partie de la tige,
  • l'enveloppe cylindrique comporte un premier tronçon s'étendant depuis la platine de positionnement et possédant un premier diamètre suivi d'un second tronçon s'étendant jusqu'au disque hélicoïdal de pénétration et possédant un second diamètre inférieur au premier diamètre et supérieur au diamètre de la deuxième partie de la tige,
  • la tige pleine est filetée ou lisse,
  • la tige pleine est filetée sur au moins la deuxième partie s'étendant entre le disque hélicoïdal de pénétration et le taillant, et en ce que cette tige pleine est lisse dans la première partie entourée de l'enveloppe cylindrique ;
  • le au moins un disque hélicoïdal d'effort présente un diamètre extérieur supérieur au diamètre extérieur du disque hélicoïdal de pénétration,
  • la tige pleine porte entre le au moins un disque hélicoïdal d'effort et le disque hélicoïdal de pénétration au moins un disque hélicoïdal intermédiaire de diamètre extérieur compris entre les diamètres extérieurs des disques hélicoïdaux, respectivement d'effort et de pénétration,
  • ledit au moins un disque hélicoïdal intermédiaire est formé par une spirale discontinue, et
  • ledit au moins un disque hélicoïdal intermédiaire est formé par une spirale conique continue reliant les disques hélicoïdaux.
According to various features of the present invention:
  • the cutter has a diameter equal to or greater than the diameter of the rod;
  • the at least one helical force disk and the helical penetration disk are welded to the shaft;
  • a cylindrical envelope is formed around the first part of the rod, between the positioning plate and the helical disk effort closest to the plate;
  • a cylindrical envelope is formed around the first part of the rod, between the positioning plate and the helical penetration disk,
  • the cylindrical envelope has a variable diameter whose smallest diameter is greater than the diameter of the second part of the stem,
  • the cylindrical envelope comprises a first section extending from the positioning plate and having a first diameter followed by a second section extending to the helical penetration disk and having a second diameter smaller than the first diameter and greater than the diameter. the second part of the stem,
  • the solid rod is threaded or smooth,
  • the solid rod is threaded on at least the second portion extending between the helical penetration disk and the cutter, and in that the solid rod is smooth in the first portion surrounded by the cylindrical envelope;
  • the at least one helical force disk has an outside diameter greater than the outside diameter of the helical penetration disk,
  • the solid rod carries between the at least one helical drive disk and the helical penetration disk at least one intermediate helical disc of outside diameter between the outer diameters of the helical disks, respectively of force and penetration,
  • said at least one intermediate helical disc is formed by a discontinuous spiral, and
  • said at least one intermediate helical disk is formed by a continuous conical spiral connecting the helical disks.

L'invention va maintenant être décrite plus en détails mais de façon non limitative en regard des figures annexées et dans lesquelles :

  • la figure 1 est une représentation schématique d'un dispositif d'ancrage selon un premier mode de réalisation de l'invention ;
  • la figure 2 est une représentation schématique d'un dispositif d'ancrage selon un deuxième mode de réalisation de l'invention ;
  • la figure 3 est une représentation schématique d'un dispositif d'ancrage selon un troisième mode de réalisation de l'invention ;
  • la figure 4 est une représentation schématique d'un dispositif d'ancrage selon un quatrième mode de réalisation de l'invention,
  • la figure 5 est une représentation schématique d'un dispositif d'ancrage selon un cinquième mode de réalisation de l'invention, et
  • la figure 6 est une représentation schématique d'un dispositif d'ancrage selon un sixième mode de réalisation de l'invention.
The invention will now be described in more detail but in a nonlimiting manner with reference to the appended figures and in which:
  • the figure 1 is a schematic representation of an anchoring device according to a first embodiment of the invention;
  • the figure 2 is a schematic representation of an anchoring device according to a second embodiment of the invention;
  • the figure 3 is a schematic representation of an anchoring device according to a third embodiment of the invention;
  • the figure 4 is a schematic representation of an anchoring device according to a fourth embodiment of the invention,
  • the figure 5 is a schematic representation of an anchoring device according to a fifth embodiment of the invention, and
  • the figure 6 is a schematic representation of an anchoring device according to a sixth embodiment of the invention.

Le dispositif d'ancrage selon l'invention, tel que représenté sur l'ensemble des figures, comprend une tige pleine 2 dont une première extrémité 21 reçoit des moyens d'attache, non représentés, d'une structure ou d'un édifice à ancrer dans le sol, l'extrémité opposée libre 22 de la tige pleine 2 étant à cet effet destinée à pénétrer dans le sol. Cette structure est amenée à être fixée par rapport au sol, que ce soit dans une application terrestre ou maritime.The anchoring device according to the invention, as shown in all the figures, comprises a solid rod 2, a first end 21 of which receives attachment means, not shown, of a structure or a building to anchoring in the ground, the opposite end free 22 of the solid rod 2 being for this purpose intended to penetrate into the ground. This structure is brought to be fixed relative to the ground, whether in a land or sea application.

Ce dispositif d'ancrage présente un intérêt particulier dans le cas d'un sol d'ancrage formé de plusieurs couches de compositions distinctes, et notamment un sol, dans lequel une première couche 31 est formée d'une épaisseur de matériau meuble, par exemple de sable, de gravillons et de manière générale de matériaux non consolidés, cette première couche 31 reposant sur une deuxième couche 32 formée de roches, de calcaires ou bétons endurcis et de manière générale de matériaux monolithiques ou consolidés.This anchoring device is of particular interest in the case of an anchoring ground formed of several layers of distinct compositions, and in particular a floor, in which a first layer 31 is formed of a thickness of loose material, by example of sand, gravel and generally non-consolidated materials, this first layer 31 resting on a second layer 32 formed of hardened rocks, limestones or concretes and generally of monolithic or consolidated materials.

A cet effet, la tige 2 présente à une distance déterminée des extrémités un disque hélicoïdal de pénétration 8, une première partie 23 de la tige 2 s'étendant entre la première extrémité d'attache 21 et ce disque hélicoïdal de pénétration 8, tandis qu'une deuxième partie 24 de la tige 2 s'étend entre le disque hélicoïdal de pénétration 8 et l'extrémité libre 22 de forage. La première partie 23 de la tige 2 est, telle que représentée sur les figures, apte à être vissée au moins dans la première couche de sol 31, et la deuxième partie 24 de la tige 2 est apte à être ancrée, par forage de l'extrémité de la tige 2, dans la deuxième couche de sol 32.For this purpose, the rod 2 has, at a determined distance from the ends, a helical penetration disk 8, a first portion 23 of the rod 2 extending between the first fastening end 21 and this helical penetration disk 8, while a second portion 24 of the rod 2 extends between the helical penetration disk 8 and the free end 22 of drilling. The first portion 23 of the rod 2 is, as shown in the figures, adapted to be screwed at least in the first layer of soil 31, and the second portion 24 of the rod 2 is adapted to be anchored, by drilling of the end of the rod 2, in the second layer of soil 32.

Une platine de positionnement 5 est montée sur la tige pleine 2 et est destinée à prendre appui sur la surface du sol, tandis que le disque hélicoïdal de pénétration 8 est disposé sur la tige 2 à une longueur déterminée de cette platine de positionnement 5 pour que le disque hélicoïdal de pénétration 8 repose sur la partie supérieure de la deuxième couche de sol plus dur 32. Une analyse des sols préalable au forage permet de déterminer la dimension de la première couche de sol 31, et donc de déterminer à quelle distance de la platine de positionnement 5 le disque hélicoïdal de pénétration 8 doit être disposé sur la tige 2.A positioning plate 5 is mounted on the solid rod 2 and is intended to bear on the ground surface, while the helical penetration disk 8 is disposed on the rod 2 at a predetermined length of this positioning plate 5 so that the helical penetration disk 8 rests on the upper part of the second layer of harder soil 32. A soil analysis prior to drilling makes it possible to determine the size of the first layer of soil 31, and thus to determine at what distance from the positioning plate 5 the helical penetration disk 8 must be arranged on the rod 2.

Selon l'application et le type de terrain dans lequel le dispositif d'ancrage est employé, la platine de positionnement 5 n'est pas nécessaire par exemple pour un ancrage dans des sols sous-marins.Depending on the application and the type of ground in which the anchoring device is used, the positioning plate 5 is not necessary for example for anchoring in underwater soils.

La première partie 23 de la tige 2 comporte au moins un disque hélicoïdal d'effort 6 dont la fonction est de pénétrer par vissage dans la première couche de sol meuble 31. Selon l'épaisseur de la couche de sol meuble, il pourra être prévu plusieurs disques hélicoïdaux d'effort 6. Le nombre de disques hélicoïdaux à prévoir sur la tige 2 dépend de la densité du sol dans lequel la tige doit être ancrée. L'augmentation du nombre de disques hélicoïdaux d'effort permet d'augmenter l'effort d'ancrage du dispositif. Ainsi, plus la densité du sol est faible, plus le nombre de disques d'effort doit être élevé. Le diamètre des disques choisis est déterminé pour éviter que des couples de reprise des efforts soient trop importants. La distance entre deux disques hélicoïdaux d'effort 6 dépend du diamètre des disques. Cette distance entre deux disques est comprise entre deux et cinq fois le diamètre du disque, et avantageusement entre trois et quatre fois ce diamètre.The first portion 23 of the rod 2 comprises at least one helical disk 6 effort whose function is to penetrate by screwing in the first layer of loose soil 31. Depending on the thickness of the loose soil layer, it can be provided several helical disks force 6. The number of helical disks to provide on the rod 2 depends on the density of the soil in which the rod must be anchored. The increase in the number of helical force disks increases the anchoring effort of the device. Thus, the lower the density of the soil, the higher the number of force disks must be. The diameter of the selected discs is determined to avoid that torques of recovery efforts are too important. The distance between two helical disks force 6 depends on the diameter of the disks. This distance between two discs is between two and five times the diameter of the disc, and advantageously between three and four times this diameter.

Les disques hélicoïdaux d'effort 6 s'étendent sur la première partie 23 de la tige 2, entre le disque hélicoïdal de pénétration 8 et la platine de positionnement 5. Afin que les disques hélicoïdaux d'effort 6 soient en prise avec la première couche de sol 31, le diamètre du disque hélicoïdal de pénétration 8, amené à pénétrer le sol avant les disques hélicoïdaux d'effort 6, doit être égal ou plus petit que les diamètres des disques hélicoïdaux d'effort 6. Il a été représenté, sur l'ensemble des figures, des disques hélicoïdaux d'effort 6 de diamètre équivalents entre eux, il sera compris qu'en conformité avec ce qui a été écrit ci-dessus, les diamètres de chaque disque hélicoïdal d'effort 6 pourraient varier, dès lors qu'une diminution du diamètre des disques hélicoïdaux d'effort 6 est respectée, du disque hélicoïdal d'effort 6 le plus proche de la platine de positionnement 5 vers le disque hélicoïdal d'effort 6 le plus proche du disque hélicoïdal de pénétration 8. Ces disques hélicoïdaux d'effort 6 peuvent présenter avantageusement une partie entrante d'amorce en biseau, et renforcée par un métal d'apport. Comme la tige pleine 2, ces disques hélicoïdaux d'effort 6 et de pénétration 8 peuvent être réalisés en acier à haute résistance. Les disques hélicoïdaux d'effort 6 et de pénétration 8 sont soudés sur la tige 2.The helical disks force 6 extend over the first portion 23 of the rod 2, between the helical penetration disk 8 and the positioning plate 5. So that the helical disks force 6 are engaged with the first layer of soil 31, the diameter of the helical penetration disk 8, brought to penetrate the ground before the helical disks force 6, must be equal to or smaller than the diameters of the helical disks effort 6. It has been shown in all figures, spiral disks effort 6 diameter equivalent to each other, it will be understood that in accordance with what has been written above, the diameters of each helical disk force 6 could vary, since a decrease in the diameter of the helical disks effort 6 is respected, the helical disk effort 6 closest to the positioning plate 5 to the helical disk 6 These helical disks force 6 may advantageously have an incoming portion of beveled primer, and reinforced by a filler metal. Like the solid rod 2, these helicoidal disks 6 and penetration 8 can be made of high-strength steel. The spiral disks 6 and penetration force 8 are welded to the rod 2.

Selon une caractéristique de la présente invention, la tige 2 s'étend dans une deuxième partie 24, après le disque hélicoïdal de pénétration 8 à l'opposé de la platine de positionnement 5. Un taillant 4 est disposé à l'extrémité libre 22 de cette tige 2. Ce taillant 4 autoforeur est soudé ou vissé en extrémité de la tige 2, et présente les caractéristiques de rigidité nécessaires pour pouvoir forer dans une deuxième couche de sol 32, composée de matériau consolidé ou monolithique. La deuxième partie 24 de la tige 2 va ainsi participer à la fixation de la structure par ancrage dans le sol, suite au forage réalisé par le taillant 4. La longueur de la deuxième partie 24 de la tige 2 est alors choisie pour réaliser cet ancrage sur une longueur suffisante pour stabiliser le dispositif d'ancrage. Selon un mode de réalisation non représenté, un manchon de raccordement peut être utilisé pour augmenter la longueur totale de la tige et donc la profondeur de pénétration dans le sol.According to a feature of the present invention, the rod 2 extends in a second portion 24, after the helical penetration disk 8 opposite the positioning plate 5. A cutting 4 is disposed at the free end 22 of This rod 2 This self-drilling cutter 4 is welded or screwed at the end of the rod 2, and has the rigidity characteristics necessary to be able to drill in a second layer of soil 32, made of consolidated or monolithic material. The second portion 24 of the rod 2 will thus participate in fixing the structure by anchoring in the ground, following the drilling performed by the cutter 4. The length of the second portion 24 of the rod 2 is then chosen to achieve this anchoring over a sufficient length to stabilize the anchoring device. According to an embodiment not shown, a connecting sleeve can be used to increase the total length of the rod and thus the depth of penetration into the ground.

Un tel dispositif permet un ancrage de structure résistant, la première partie 23 de la tige 2 étant destinée à être vissée dans au moins une première couche de sol meuble 31, qui s'étend sur une deuxième couche 32 d'un sol monolithique et consolidé, plus dure que la première couche de sol 31, et dans laquelle la deuxième partie 24 de la tige 2 est apte à être ancrée. L'extrémité de forage de la tige, munie du taillant, creuse initialement la première couche de sol meuble, et façonne un trou de forage qui facilite l'action de vissage des disques hélicoïdaux de pénétration puis d'effort dans cette première couche.Such a device allows a strong structure anchoring, the first portion 23 of the rod 2 being intended to be screwed into at least a first layer of loose soil 31, which extends over a second layer 32 of a monolithic soil and consolidated , harder than the first layer of soil 31, and wherein the second portion 24 of the rod 2 is adapted to be anchored. The drill end of the rod, provided with the cutter, initially digs the first layer of loose soil, and shapes a borehole which facilitates the screwing action of the helical discs penetration and effort in this first layer.

Le taillant 4 disposé à l'extrémité libre de la tige 2 présente un diamètre égal ou supérieur au diamètre de la deuxième partie 24 de cette tige 2. Le forage du sol par le taillant 4 génère alors une cavité 12 dans laquelle vient s'étendre, à la suite du taillant 4, la deuxième partie 24 de la tige 2.The cutter 4 disposed at the free end of the rod 2 has a diameter equal to or greater than the diameter of the second portion 24 of this rod 2. The drilling of the ground by the cutting 4 then generates a cavity 12 in which extends, following the cut 4, the second portion 24 of the rod 2.

Dans un deuxième mode de réalisation représenté à la Fig. 2, une enveloppe cylindrique 40 est formée autour de la première partie 23 de la tige pleine 2 entre la platine de positionnement 5 et le disque hélicoïdal de pénétration 8 et cette enveloppe 40 présente un diamètre variable.In a second embodiment shown in Fig. 2 , a cylindrical casing 40 is formed around the first portion 23 of the solid rod 2 between the positioning plate 5 and the helical penetration disk 8 and this casing 40 has a variable diameter.

D'une manière générale, le diamètre variable de l'enveloppe cylindrique 40 varie entre un grand diamètre et un petit diamètre qui est supérieur au diamètre de la deuxième partie 24 de la tige 2.In general, the variable diameter of the cylindrical envelope 40 varies between a large diameter and a small diameter which is greater than the diameter of the second portion 24 of the rod 2.

Comme montré à la Fig. 2, l'enveloppe cylindrique 40 comporte un premier tronçon 41 s'étendant depuis la platine de positionnement 5 et possédant un premier diamètre d1 suivi d'un second tronçon 42 s'étendant jusqu'au disque hélicoïdal de pénétration 8 et possédant un second diamètre d2 inférieur au premier diamètre d1 et supérieur au diamètre d3 de la deuxième partie 24 de la tige 2.As shown in Fig. 2 , the cylindrical casing 40 comprises a first section 41 extending from the positioning plate 5 and having a first diameter d1 followed by a second section 42 extending to the helical penetration disk 8 and having a second diameter d2 less than the first diameter d1 and greater than the diameter d3 of the second portion 24 of the rod 2.

Les tronçons 41 et 42 de l'enveloppe cylindrique 40 sont soudés entre eux et ils supportent des disques hélicoïdaux d'effort 6. La tige pleine 23 filetée ou lisse forme la colonne de résistance principale et permet tous les types d'accrochage en partie supérieure ainsi que les liaisons avec un dispositif d'injection de ciment ou de résine synthétique.The sections 41 and 42 of the cylindrical envelope 40 are welded together and they support helical disks of effort 6. The solid rod 23 threaded or smooth form the main resistance column and allows all types of attachment in the upper part as well as the connections with a device for injecting cement or synthetic resin.

En se reportant maintenant aux figures 3 à 6, on va décrire d'autres modes de réalisation du dispositif d'ancrage selon l'invention.Referring now to Figures 3 to 6 other embodiments of the anchoring device according to the invention will be described.

Sur ces figures, les éléments communs aux précédents modes de réalisation sont désignés par les mêmes références.In these figures, the elements common to the previous embodiments are designated by the same references.

Le dispositif d'ancrage représenté sur ces figures possède une capacité autoforante supérieure à celle des dispositifs précédemment décrits et il peut être utilisé notamment dans certains sols sous-marins, de granulométrie et de structure minérale variée, compactés par la pression de l'eau et également dans certains sols terrestres de nature argilo-calcaire ou composés de graves à prise hydraulique, présentant des compacités proches des sols monolithiques.The anchoring device shown in these figures has a higher self-drilling capacity than the devices previously described and it can be used in particular in certain underwater soils, of varying grain size and mineral structure, compacted by the pressure of water and also in some terrestrial soils of clay-limestone nature or composed of serious with hydraulic catch, presenting compacities close to the monolithic soils.

Sur les figures 3 et 4, le dispositif d'ancrage est formé par une tige pleine 2 filetée sur toute sa longueur entre les deux extrémités 21 et 22. L'extrémité 22 de la tige 2 est pourvue d'un taillant 4. Le disque hélicoïdal d'effort 6 le plus proche du taillant 4 présente un diamètre extérieur supérieur au diamètre extérieur du disque hélicoïdal de pénétration 8.On the figures 3 and 4 , the anchoring device is formed by a solid rod 2 threaded over its entire length between the two ends 21 and 22. The end 22 of the rod 2 is provided with a cutter 4. The helical disk stress 6 the closer to the cutter 4 has an outside diameter greater than the outside diameter of the helical penetration disk 8.

La tige 2 porte dans sa deuxième partie 24 entre le disque hélicoïdal d'effort 6 le plus proche du taillant 4 et le disque hélicoïdal de pénétration 8 au moins un disque hélicoïdal intermédiaire 50 de diamètre extérieur compris entre les diamètres extérieurs des disques hélicoïdaux, respectivement d'effort 6 et de pénétration 8.The rod 2 carries in its second part 24 between the helical disk of effort 6 closest to the cutter 4 and the helical disk penetration 8 at least one disk intermediate spiral 50 of outer diameter between the outer diameters of the helical disks, respectively of force 6 and penetration 8.

Selon le mode de réalisation représenté à la figure 3, le disque hélicoïdal intermédiaire 50 est formé par au moins une spirale discontinue 51 soudée sur la tige 2.According to the embodiment shown in figure 3 , the helicoidal intermediate disc 50 is formed by at least one discontinuous spiral 51 welded to the rod 2.

Selon une variante, plusieurs spirales discontinues 51 peuvent être intercalées dans l'espace délimité par le disque hélicoïdal d'effort 6 et le disque hélicoïdal de pénétration 8, ces spirales discontinues étant intercalées selon un pas variable ou constant et le diamètre de ces spirales discontinues étant inscrit dans une enveloppe tronconique dont la grande base est le diamètre du disque hélicoïdal d'effort 6 et la petite base, le diamètre du disque hélicoïdal de pénétration 8.According to one variant, a plurality of discontinuous spirals 51 may be interposed in the space delimited by the helical force disk 6 and the helical penetration disk 8, these discontinuous spirals being interposed in a variable or constant pitch and the diameter of these discontinuous spirals. being inscribed in a frustoconical envelope whose large base is the diameter of the helical disk of force 6 and the small base, the diameter of the helical disc of penetration 8.

Selon un autre mode de réalisation représenté à la figure 4, le disque hélicoïdal intermédiaire 50 est formé par une spirale conique 52 continue reliant les disques hélicoïdaux, respectivement d'effort 6 et de pénétration 8. Cette spirale continue 52 est inscrite dans une enveloppe tronconique dont la grande base est déterminée par le diamètre extérieur du disque hélicoïdal d'effort 6 et la petite base est déterminée par le diamètre extérieur du disque hélicoïdal de pénétration 8.According to another embodiment shown in figure 4 , the intermediate helical disk 50 is formed by a conical spiral 52 continuous connecting the helical disks, respectively of force 6 and penetration 8. This continuous spiral 52 is inscribed in a frustoconical envelope whose large base is determined by the outer diameter of the spiral helical disk 6 and the small base is determined by the outside diameter of the helical disk penetration 8.

Selon les modes de réalisation représentés sur les figures 5 et 6, une enveloppe cylindrique 40 présentant un diamètre variables et disposée autour de la première partie 23 de la tige pleine 2 et le disque hélicoïdal d'effort 6 le plus proche du taillant 4. Cette enveloppe cylindrique 40 est identique à celle décrite pour le mode de réalisation représenté à la figure 5.According to the embodiments shown on the figures 5 and 6 , a cylindrical envelope 40 having a variable diameter and disposed around the first portion 23 of the solid rod 2 and the helical disk effort 6 closest to the cutter 4. This cylindrical envelope 40 is identical to that described for the mode of realization represented at figure 5 .

Dans ces modes de réalisation, le disque hélicoïdal d'effort 6 le plus proche du taillant 4 présente également un diamètre extérieur supérieur au diamètre extérieur du disque hélicoïdal de pénétration 8 et la tige 2 porte entre ce disque hélicoïdal d'effort 6 et ce disque hélicoïdal de pénétration 8 au moins un disque hélicoïdal intermédiaire 50 de diamètre extérieur compris entre les diamètres extérieurs des disques hélicoïdaux, respectivement d'effort 6 et de pénétration 8.In these embodiments, the helical force disk 6 closest to the cutter 4 also has an outside diameter greater than the outside diameter of the helical penetration disk 8 and the rod 2 carries between this helical disk 6 and this drive disk helical helix 8 at least one intermediate helical disc 50 of outer diameter between the outer diameters of the helical disks, respectively of force 6 and penetration 8.

Sur la figure 5, ledit au moins un disque hélicoïdal intermédiaire 50 est formé par une spirale discontinue 51 identique à la spirale discontinue du mode de réalisation représenté à la figure 3. Sur la figure 6, ledit au moins un disque hélicoïdal intermédiaire est formé par une spirale conique 52 continue identique à celle du mode de réalisation représenté à la figure 4.On the figure 5 said at least one intermediate helical disk 50 is formed by a discontinuous spiral 51 identical to the discontinuous spiral of the embodiment shown in FIG. figure 3 . On the figure 6 said at least one intermediate helical disk is formed by a continuous conical spiral 52 identical to that of the embodiment shown in FIG. figure 4 .

Tel que représentée sur les figures, la tige 2 pleine formant le dispositif d'ancrage présente un diamètre constant sur toute la longueur du dispositif d'ancrage. Il sera compris qu'une tige 2 de diamètre constant permet une industrialisation simplifiée du dispositif d'ancrage, mais pourrait être remplacée dans une variante par une tige de diamètre variable. A titre d'exemple non limitatif, le diamètre des parties de la tige 2 non recouvertes d'une enveloppe cylindrique 20 ou 40 pourrait être supérieur au diamètre des parties de la tige entourées de ladite enveloppe 20 ou 40. Ces variations de diamètre de la tige doivent toutefois permettre la réalisation des caractéristiques évoquées ci-dessus, à savoir notamment que le taillant 4 doit présenter un diamètre supérieur au diamètre de la deuxième partie 24 de la tige 2.As shown in the figures, the solid rod 2 forming the anchoring device has a constant diameter over the entire length of the anchoring device. It will be understood that a rod 2 of constant diameter allows a simplified industrialization of the anchoring device, but could be replaced in a variant by a rod of variable diameter. By way of nonlimiting example, the diameter of the parts of the rod 2 not covered with a cylindrical envelope 20 or 40 could be greater than the diameter of the parts of the rod surrounded by said envelope 20 or 40. These variations in diameter of the rod must however allow the realization of the characteristics mentioned above, namely in particular that the cutter 4 must have a diameter greater than the diameter of the second portion 24 of the rod 2.

De même, il est représenté sur les figures une tige 2 pleine filetée. Il sera compris que cette tige peut être filetée ou lisse, et par exemple présenter un profil mixte. A titre d'exemple, la tige 2 peut être filetée sur la deuxième partie 24 s'étendant entre le disque de pénétration 8 et le taillant 4, et cette tige 2 peut être lisse dans la partie 23 entourée de l'enveloppe cylindrique 20 ou 40.Similarly, there is shown in the figures a rod 2 full threaded. It will be understood that this rod can be threaded or smooth, and for example have a mixed profile. For example, the rod 2 may be threaded on the second portion 24 extending between the penetration disc 8 and the cutter 4, and this rod 2 may be smooth in the portion 23 surrounded by the cylindrical envelope 20 or 40.

Un tel dispositif d'ancrage permet la fixation de structure ou d'édifice dans des sols présentant des couches de compositions différentes. Le dispositif d'ancrage est mis en place par vissage à l'aide d'un roto percuteur, supporté par un bras de forage ou par une installation immergée selon l'application terrestre ou marine envisagée. Le dispositif peut alors s'étendre dans ces différentes couches successives de façon strictement verticale tel que représenté, ou avec une orientation différente sans sortir du contexte de l'invention, dès lors que le taillant et la deuxième partie de la tige sont ancrés dans une deuxième couche de sol monolithique ou consolidé, ou meuble, et dès lors que cette deuxième couche est recouverte d'au moins une première couche de sol meuble, et que la première partie de la tige et les disques associés sont vissés dans au moins la première couche de sol meuble.Such an anchoring device allows the fixation of structure or building in soils with layers of different compositions. The anchoring device is set up by screwing using a rotary hammer, supported by a drill arm or by a submerged installation according to the terrestrial or marine application envisaged. The device can then extend in these successive layers in a strictly vertical manner as shown, or with a different orientation without departing from the context of the invention, since the cutting edge and the second part of the rod are anchored in a second layer of monolithic or consolidated soil, or furniture, and since this second layer is covered with at least a first layer of loose soil, and that the first part of the stem and the associated disks are screwed into at least the first layer of loose soil.

Un tel dispositif d'ancrage mixte, combinant les caractéristiques d'ancrage par forage et de vissage, par l'intermédiaire d'une unique tige, permet la prise en compte en un dispositif unique de l'ensemble des efforts d'ancrage, à savoir les efforts d'extraction et de flexion d'une part, et de compression et de flambage d'autre part.Such a mixed anchoring device, combining the characteristics of anchoring by drilling and screwing, by means of a single rod, makes it possible to take into account, in a single device, all the anchoring forces, know the efforts of extraction and bending on the one hand, and compression and buckling on the other hand.

Le dispositif d'ancrage mixte selon l'invention est capable de résister à diverses sollicitations et principalement aux efforts de flexion en renforçant le diamètre supérieur de la tige pleine 2. Les efforts de flexion sont générés par des efforts variables avec une orientation comprise entre 0 et 90°.The mixed anchoring device according to the invention is able to withstand various stresses and mainly bending forces by reinforcing the upper diameter of the solid rod 2. The bending forces are generated by variable forces with an orientation between 0 and 90 °.

Claims (13)

  1. Device for anchoring in multi-layer soil, comprising a solid rod (2) a first end (21) of which receives attachment means and the opposite free end (22) of which is intended to penetrate into the soil, wherein a positioning plate (5) is mounted on the rod (2) and is intended to rest on the surface of the soil, the rod bearing successively from the positioning plate (5) to the free end (22) at least one helical tension disc (6) then a helical drilling disc (8), characterized in that the solid rod (2) extends after the helical drilling disc (8) opposite the positioning plate (5), and in that a drill bit (4) is disposed at the free end of said rod, such that the first part (23) of the rod (2) extends from the positioning plate (5) to the helical drilling disc (8), this first part (23) being capable of being screwed into at least a first layer of soil (31), and such that a second part (24) of the rod (2) extends from the helical drilling disc (8) to the drill bit (4), this second part (24) being capable of being anchored in a second layer of soil (32).
  2. Anchoring device according to claim 1, characterised in that the drill bit (4) has a diameter equal to or greater than the diameter of the second part (24) of the rod (2).
  3. Anchoring device according to claim 1 or 2, characterised in that the at least one helical tension disc (6) and the helical drilling disc (8) are welded onto the rod (2).
  4. Anchoring device according to claim 1, characterised in that a cylindrical casing (20) is formed around the first part (23) of the rod (2), between the positioning plate (5) and the helical tension disc (6) closest to this plate (5).
  5. Anchoring device according to claim 1, characterised in that a cylindrical casing (20, 40) is formed around the first part (23) of the rod (2), between the positioning plate (5) and the helical drilling disc (8).
  6. Anchoring device according to claim 5, characterised in that the cylindrical casing (40) has a variable diameter, the smallest diameter of which is greater than the diameter of the second part (24) of the rod (2).
  7. Anchoring device according to claim 6, characterised in that the cylindrical casing (40) comprises a first section (41) extending from the positioning plate (5) and having a first diameter followed by a second section (42) extending to the helical drilling disc (8) and having a second diameter less than the first diameter and greater than the diameter of the second part (24) of the rod (2).
  8. Anchoring device according to any one of claims 4 to 7, characterised in that the solid rod (2) is threaded or smooth.
  9. Anchoring device according to any one of claims 4 to 7, characterised in that the solid rod (2) is threaded over at least the second part (24) extending between the helical drilling disc (8) and the drill bit (4), and in that this hollow rod (2) is smooth in the first part (23) surrounded by the cylindrical casing (20, 40).
  10. Anchoring device according to any one of the preceding claims, characterised in that the at least one helical tension disc (6) has an outside diameter greater than the outside diameter of the helical drilling disc (8).
  11. Anchoring device according to any one of the preceding claims, characterised in that the solid rod (2) supports, between the at least one helical tension disc (6) and the helical drilling disc (8), at least one intermediate helical disc (50) with an outside diameter between the outside diameters of the helical discs, respectively tension (6) and drilling (8).
  12. Anchoring device according to claim 11, characterised in that said at least one intermediate helical disc (50) is formed by a discontinuous spiral (51).
  13. Anchoring device according to claim 11, characterised in that said at least one intermediate helical disc (50) is formed by a continuous conical spiral (52) connecting the helical discs, respectively tension (6) and drilling (8).
EP11306657.5A 2010-12-14 2011-12-14 Device for anchoring in multi-layer soil. Active EP2466012B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1060506A FR2968684B1 (en) 2010-12-14 2010-12-14 DEVICE FOR ANCHORING IN A MULTILAYER SOIL.

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EP2466012A1 EP2466012A1 (en) 2012-06-20
EP2466012B1 true EP2466012B1 (en) 2017-10-11

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Publication number Priority date Publication date Assignee Title
EP3329051B1 (en) * 2015-07-28 2020-07-08 Recycled Plastic Foundations Pty Ltd Supporting post improvements
CN113969799B (en) * 2021-12-06 2023-12-22 辽宁沈通电力桩基础研发有限公司 Long and short spiral anchor
CN114000534A (en) * 2021-12-10 2022-02-01 国网青海省电力公司 Spiral anchor foundation structure of transmission line tower of Gobi gravel soil foundation

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GB2360809B (en) * 2000-03-28 2004-02-25 Screw Fast Foundations Ltd A screw pile and method of installation
FR2863633B1 (en) * 2003-12-10 2007-04-13 Ancrest Sa ANCHORING DEVICE IN THE SOIL
GB2456504A (en) * 2008-01-12 2009-07-22 Brent Kirk Powell Adjustable Base Support
FR2940807B1 (en) * 2009-01-06 2011-02-04 Ancrest Sa DEVICE FOR ANCHORING IN A SOIL

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ES2648912T3 (en) 2018-01-08
EP2466012A1 (en) 2012-06-20
FR2968684A1 (en) 2012-06-15
FR2968684B1 (en) 2013-01-11

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