(19)
(11)EP 3 392 413 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
09.09.2020 Bulletin 2020/37

(21)Application number: 18167977.0

(22)Date of filing:  18.04.2018
(51)International Patent Classification (IPC): 
E02D 5/34(2006.01)
E21B 7/26(2006.01)
E02D 15/04(2006.01)

(54)

DRILLING TIP FOR A SOIL DISPLACEMENT DRILL

BOHRSPITZE FÜR EINEN BODENVERDRÄNGUNGSBOHRER

POINTE DE FORAGE POUR FORAGE DE DÉPLACEMENT DU SOL


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 18.04.2017 NL 2018729

(43)Date of publication of application:
24.10.2018 Bulletin 2018/43

(73)Proprietor: Chinforce B.V.
3132 XZ Hoofddorp (NL)

(72)Inventors:
  • Leliveld, Marcus Nicolaas Maria
    1064 PN Amsterdam (NL)
  • Heerding, Christiaan Jan
    1028 BM Amsterdam (NL)

(74)Representative: De Vries & Metman 
Overschiestraat 180
1062 XK Amsterdam
1062 XK Amsterdam (NL)


(56)References cited: : 
EP-A1- 1 672 125
DE-A1- 3 501 439
EP-A1- 2 843 138
JP-A- H01 312 193
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The invention relates to a drilling tip for a soil displacement drill for producing a foundation pile, said drilling tip comprising: an at least substantially cone-shaped body, preferably with a top angle (tip) between 80 and 100°, for example 90°, a connection for a supply line for a liquid, in particular grout, and one or more exit channels for said liquid, in particular two or more channels extending in a radial direction or at least a direction having a radial component and/or distributed regularly (mutually equal angles) along the circumference of the insert.

    [0002] NL 1018702 relates to a method for inserting a foundation pile in the soil while using a soil displacement drill, in which a hollow drilling tube together with a soil displacement drill attached thereto in combination as foundation pile is inserted in the soil by axial pressure and in a rotating manner using a lengthener connected to the hollow drilling tube and wherein during insertion in the soil a liquid substance is supplied to the soil through the soil displacement drill via a liquid supply extending through the lengthener and the foundation pile.

    [0003] NL 8401118 relates to a soil displacement drill comprising a drilling tube and a hollow drilling head connectable thereto which exists of a cylindrical edge and a substantially cone-shaped tip connecting thereto which is provided with at least two soil displacement faces extending spirally from the cone tip towards the cylindrical edge. The document EP 2843138 A1 discloses the preamble to claim 1.

    [0004] Among others such foundation piles are used when pile driving is not possible or desirable, for example because it causes too much nuisance for third parties or a risk of damaging nearby constructions. A displacement drill for producing a foundation pile comprises a drilling tip which, by means of welding (in a fixed manner) or lugs (in a detachable manner) is attached to a (drilling) tube and is inserted in the soil by axial pressure and in a rotating manner. During inserting the tube in the soil a liquid, such as grout or bentonite suspension, is supplied to the soil through exit channels in the drilling tip via a liquid supply extending along the tube. By supplying the liquid a reduction of the rotational resistance of the drill in the soil is achieved. Further, the supply of for example cement emulsion to a soil layer, for example a sand layer, may enhance the fixation of the foundation pile to the soil. After the drill has reached the desired depth, the tube is filled with concrete and possibly a reinforcement and the liquid supply is detached and is withdrawn and then possibly is vibrated for compacting the concrete. Depending on the chosen construction the tube remains in the soil or the tube is withdrawn.

    [0005] Drilling tips for foundation piles are big and heavy, for example weigh 70 kg, and comprise components which have to be manufactured with precision. The invention intends to provide an improved drilling tip.

    [0006] To this end, the cone-shaped body of the drilling tip is provided with a central opening and in said opening an insert is mounted in which the connection for the supply line and one or more exit channels are provided. In an embodiment, the insert is welded into the opening. In a further embodiment, the insert comprises a valve, preferably a check valve, between the connection for the supply line and one or more exit channels.

    [0007] Owing to the insert according to the invention a number of critical elements and/or functions of the drilling tip are integrated in a relatively small part which, compared to a heavy and clumsy casting, can be machined in a more simple and/or more precise manner before it is mounted into the drilling tip. Moreover, a design or type of insert can be applied to different designs or types of drilling tips: users of this type of drilling tips have different wishes, for example relating to the drill geometry, the connection of the grout and/or the connection of the drive, in particular the rotatably drivable drilling tube. Further, the drilling tips, as long as the inserts or at least the grout tubes are not yet attached therein, can be stacked (nested) more easily, such that the drilling tips require less space during transport and more drilling tips can be transported per packaging, pallet or (sea)container.

    [0008] In an embodiment, the valve comprises a valve body, preferably a ball, a valve seat and a spring to urge the valve body onto the valve seat. During, and possibly even after drilling, the valve allows passage of the liquid, such as grout, but prevents groundwater from entering the drilling tube. Groundwater entering the drilling tube will mix with the concrete supplied into the tube after drilling and will severely compromise the strength of the cured concrete.

    [0009] In an embodiment, the insert at its outer side is provided with an attachment member, preferably a hoisting lug, for hoisting means. Therewith the drilling tips, also relatively heavy drilling tips, can be easily moved, for example unloaded from a packaging or a truck and be positioned alongside a picket pole marking the location for the foundation pile to be manufactured.

    [0010] In an embodiment, the cone-shaped body and/or the insert are made of cast steel. Cast steel enhances the weldability of the insert into the cone-shaped body and enables a relatively strong hoisting lug.

    [0011] In an embodiment, the insert comprises one or more exit channels for the liquid, in particular two or more channels, for example three or four, extending in a radial direction, at least a direction having a radial component and/or distributed regularly along the circumference of the insert.

    [0012] In an embodiment, the central opening and the insert at least comprise a feature, for example a flat face on an otherwise round circumference, determining the orientation of the insert in the opening. Thus, for example, the position of the exit channels relative to other elements of the drilling tip, such as spiral ribs or teeth, can be assured.

    [0013] The invention further relates to an insert for a drilling tip for a soil displacement drill for producing a foundation pile, comprising a connection for a supply line for a liquid, in particular grout, one or more exit channels for said liquid, in particular two or more channels extending in a radial direction, at least a direction having a radial component and/or distributed regularly (mutually equal angles) along the circumference of the insert, and a valve, preferably a check valve, between the connection for the supply line and one or more exit channels.

    [0014] In an embodiment, the valve comprises a valve body, preferably a ball, a valve seat and a spring urging the valve body onto the valve seat.

    [0015] The invention further relates to a kit for producing a drilling tip for a soil displacement drill, said kit comprising: a substantially cone-shaped body that is provided with a central opening and an insert as described above.

    [0016] Within the scope of the invention the term "substantially cone-shaped body" relates to cones with, in a longitudinal section, a straight wall and/or a concavely and/or convexly curved wall and/or provided with teeth and/or one or more spiral ribs, and/or which moreover comprises non-conical parts, such as a cylindrical part, in particular a cylindrical part which can be engaged by a drilling tube or to which a drilling tube can be welded. The term "liquid" comprises all liquid media that can flow through the supply line and the exit channels, in particular multiphase systems, such as suspensions, for example grout and bentonite suspended in water.

    [0017] Next the invention will be elucidated while referring to the figures in which an embodiment of the invention is shown.

    Figure 1 is an isometric view of a drilling tip according to the invention.

    Figure 2 is a cross-section of the drilling tip shown in Figure 1.

    Figure 3 shows an insert of the drilling tip shown in Figures 1 and 2.

    Figures 4 and 5 show cross-sections of the insert shown in Figure 3.

    Figures 1 and 2 illustrate a drilling tip 1 for a soil displacement drill for positioning a foundation pile. The drilling tip comprises a cone-shaped body 2, in this example a cone with (in the illustrated longitudinal cross-section) a straight wall 3 on which four rows of teeth 4 and four spiral ribs 5 are provided, and a cylindrical part 6 that at its inner side is provided with projections 7 which are complimentary to recesses on the outer wall of a drilling tube (not shown) known per se, such that the drilling tube, when driven in rotation, drive the drilling tip in said rotational movement. The cone has a tip angle of 90°. The cone-shaped body is provided with a central opening 10 in which an insert 11 is welded.



    [0018] The insert, illustrated in more detail in Figures 3-5, comprises a connection 12 for a supply line, i.e. a so-called grout tube 13, and one or more exit channels, in this example four straight channels 14 which extend radially, mutually (in top plan view) extend at an angle of 90° and debouche between the spiral ribs 5. In this example, the connection 12 comprises an annular edge which is provided with an inner thread. The end of the grout tube that is screwed into the connection is provided with an external conical thread. Because the external thread is conical, it better seals in the connection.

    [0019] The insert 11 further comprises a check valve, between the connection 12 for the supply line and the exit channels 14. The check valve comprises: a plastic ball 15, a valve seat 16 and a helical spring 17 urging the ball onto the valve seat. In this example, the valve seat is screwed into the insert, preferably from the side of the connection for the liquid. Finally, the insert at its tip is provided with a hoisting lug 18.

    [0020] Thus, the connection for the grout tube, the check valve, the exit channels, and the hoisting lug all are provided in the insert which, compared to the cone-shaped body, can be machined easier and/or more precisely before it is mounted in said body. Moreover, a single design or type of insert can be applied on different designs or types of drilling tips. Further, as long as the inserts are not yet mounted therein, the drilling tips can be stacked (nested) more easily, such that the drilling tips require considerably less space during transport and more drilling tips can be transported per packaging, pallet or (sea)container.


    Claims

    1. Drilling tip (1) for a soil displacement drill for placing a foundation pile, said drilling tip (1) comprising: an at least substantially cone-shaped body (2), a connection (12) for a supply line (13) for a liquid, ein particular grout, and one or more exit channels (14) for said liquid, characterized in that the cone-shaped body (2) is provided with a central opening (10) and in that in said opening (10) an insert (11) is mounted in which the connection (12) for the supply line (13) and one or more exit channels (14) are provided.
     
    2. Drilling tip (1) according to claim 1, wherein the insert (11) is welded into the opening (10).
     
    3. Drilling tip (1) according to claim 1 or 2, comprising a valve, preferably a check valve (15, 16, 17), between the connection (12) for the supply line (13) and one or more exit channels (14), said valve (15, 16, 17) being housed in the insert (11).
     
    4. Drilling tip (1) according to claim 3, wherein the valve comprises: a valve body, preferably a ball (15), a valve seat (16) and a spring (17) urging the valve body (15) onto the valve seat (16).
     
    5. Drilling tip (1) according to claim 4, wherein the valve seat (16) is screwed into the insert (11), preferably from the side of the connection (12) for the supply line (13) for a liquid.
     
    6. Drilling tip (1) according to any of the preceding claims, wherein the insert (11) at its outer side is provided with an attachment member, preferably a hoisting lug (18), for hoisting means.
     
    7. Drilling tip (1) according to any of the preceding claims, wherein the cone-shaped body (2) and/or the insert (11) are made of cast steel.
     
    8. Drilling tip (1) according to any of the preceding claims, wherein the insert (11) comprises one or more exit channels (14) for the liquid, in particular two or more channels (14) extending in a radial direction or at least a direction having a radial component and/or distributed regularly along the circumference of the insert (11).
     
    9. Drilling tip (1) according to any of the preceding claims, wherein the central opening (10) and the insert (11) at least comprise a feature determining the orientation of the insert (11) in the opening (10).
     
    10. Insert (11) for a drilling tip (1) for a soil displacement drill for producing a foundation pile, comprising a connection (12) for a supply line (13) for a liquid, in particular grout, one or more exit channels (14) for said liquid, in particular two or more channels (14) extending in a radial direction or at least a direction having a radial component and/or distributed regularly along the circumference of the insert (11), and a valve, preferably a check valve (15, 16, 17), between the connection (12) for the supply line (13) and one or more exit channels (14).
     
    11. Insert (11) according to claim 10, wherein the valve comprises: a valve body, preferably a ball (15), a valve seat (16) and a spring (17) urging the valve body (15) onto the valve seat (16).
     
    12. Insert (11) according to claim 11, wherein the valve seat (16) is screwed into the insert (11), preferably from the side of the connection (12) for the liquid.
     
    13. Insert (11) according to any of the claims 10-12, wherein the insert (11) at its outer side is provided with an attachment member, preferably a hoisting lug (18), for hoisting means.
     
    14. Insert (11) according to any of the claims 11-13, wherein the insert (11) is made of cast steel.
     
    15. Kit (2, 11) for producing a drilling tip (1) for a soil displacement drill, said kit comprising: a substantially cone-shaped body (2) that is provided with a central opening (10) and an insert (11) according to any of the claims 11-14.
     


    Ansprüche

    1. Bohrspitze (1) für einen Bodenverdrängungsbohrer zum Platzieren eines Fundamentpfeilers, wobei die Bohrspitze (1) aufweist: einen mindestens im Wesentlichen kegelförmigen Körper (2), einen Anschluss (12) für eine Zufuhrleitung (13) für eine Flüssigkeit, insbesondere Mörtel, und einen oder mehrere Austrittskanäle (14) für die Flüssigkeit,
    dadurch gekennzeichnet, dass
    der kegelförmige Körper (2) eine Mittenöffnung (10) aufweist; und
    in der Öffnung (10) ein Einsatz (11) montiert ist, in dem der Anschluss (12) für die Zufuhrleitung (13) und ein oder mehrere Austrittskanäle (14) vorgesehen sind.
     
    2. Bohrspitze (1) nach Anspruch 1, wobei der Einsatz (11) in die Öffnung (10) eingeschweißt ist.
     
    3. Bohrspitze (1) nach Anspruch 1 oder 2, mit einem Ventil, vorzugsweise einem Absperrventil, (15, 16, 17) zwischen dem Anschluss (12) für die Zufuhrleitung (13) und einem oder mehreren Austrittskanälen (14), wobei das Ventil (15, 16, 17) im Einsatz (11) aufgenommen ist.
     
    4. Bohrspitze (1) nach Anspruch 3, wobei das Ventil aufweist: einen Ventilkörper, vorzugsweise eine Kugel (15), einen Ventilsitz (16) und eine Feder (17), die den Ventilkörper (15) auf den Ventilsitz (16) drückt.
     
    5. Bohrspitze (1) nach Anspruch 4, wobei der Ventilsitz (16), vorzugsweise von der Seite des Anschlusses (12) für die Zufuhrleitung (13) für eine Flüssigkeit, in den Einsatz (11) eingeschraubt ist.
     
    6. Bohrspitze (1) nach einem der vorangehenden Ansprüche, wobei der Einsatz (11) an seiner Außenseite ein Befestigungselement, vorzugsweise eine Hebeöse, (18) für eine Hebeeinrichtung aufweist.
     
    7. Bohrspitze (1) nach einem der vorangehenden Ansprüche, wobei der kegelförmige Körper (2) und/oder der Einsatz (11) aus Stahlguss hergestellt sind.
     
    8. Bohrspitze (1) nach einem der vorangehenden Ansprüche, wobei der Einsatz (11) einen oder mehrere Austrittskanäle (14) für die Flüssigkeit aufweist, insbesondere zwei oder mehr Kanäle (14), die sich in einer radialen Richtung oder zumindest in einer Richtung mit einer radialen Komponente erstrecken und/oder entlang des Umfangs des Einsatzes (11) regelmäßig verteilt sind.
     
    9. Bohrspitze (1) nach einem der vorangehenden Ansprüche, wobei die Mittenöffnung (10) und der Einsatz (11) mindestens ein Merkmal aufweisen, das die Ausrichtung des Einsatzes (11) in der Öffnung (10) bestimmt.
     
    10. Einsatz (11) für eine Bohrspitze (1) für einen Bodenverdrängungsbohrer zum Herstellen eines Fundamentpfeilers, mit einem Anschluss (12) für eine Zufuhrleitung (13) für eine Flüssigkeit, insbesondere Mörtel, einem oder mehreren Austrittskanälen (14)) für die Flüssigkeit, insbesondere zwei oder mehreren Kanälen (14), die sich in einer radialen Richtung oder zumindest in einer Richtung mit einer radialen Komponente erstrecken und/oder entlang des Umfangs des Einsatzes (11) regelmäßig verteilt sind, und einem Ventil, vorzugsweise einem Absperrventil, (15, 16, 17) zwischen dem Anschluss (12) für die Zufuhrleitung (13) und einem oder mehreren Austrittskanälen (14).
     
    11. Einsatz (11) nach Anspruch 10, wobei das Ventil aufweist: einen Ventilkörper, vorzugsweise eine Kugel, (15) einen Ventilsitz (16) und eine Feder (17), die den Ventilkörper (15) auf den Ventilsitz (16) drückt.
     
    12. Einsatz (11) nach Anspruch 11, wobei der Ventilsitz (16), vorzugsweise von der Seite des Anschlusses (12) für die Flüssigkeit, in den Einsatz (11) eingeschraubt ist.
     
    13. Einsatz (11) nach einem der Ansprüche 10 bis 12, wobei der Einsatz (11) an seiner Außenseite ein Befestigungselement, vorzugsweise eine Hebeöse, (18) für eine Hebeeinrichtung aufweist.
     
    14. Einsatz (11) nach einem der Ansprüche 11 bis 13, wobei der Einsatz (11) aus Stahlguss hergestellt ist.
     
    15. Kit (2, 11) zum Herstellen einer Bohrspitze (1) für einen Bodenverdrängungsbohrer, wobei das Kit aufweist: einen im Wesentlichen kegelförmigen Körper (2), der eine Mittenöffnung (10) aufweist, und einen Einsatz (11) nach einem der Ansprüche 11 bis 14.
     


    Revendications

    1. Pointe de forage (1) pour un appareil de forage à refoulement de sol permettant de placer un pieu de fondation, ladite pointe de forage (1) comprenant : un corps de forme au moins sensiblement conique (2), un raccord (12) pour une conduite d'alimentation (13) pour un liquide, en particulier un coulis, et un ou plusieurs canaux de sortie (14) pour ledit liquide, caractérisée en ce que le corps de forme conique (2) est pourvu d'une ouverture centrale (10) et en ce que dans ladite ouverture (10) est montée une pièce rapportée (11) dans laquelle le raccord (12) pour la conduite d'alimentation (13) et un ou plusieurs canaux de sortie (14) sont prévus.
     
    2. Pointe de forage (1) selon la revendication 1, dans laquelle la pièce rapportée (11) est soudée dans l'ouverture (10).
     
    3. Pointe de forage (1) selon la revendication 1 ou 2, comprenant un clapet, de préférence un clapet antiretour (15, 16, 17) entre le raccord (12) pour la conduite d'alimentation (13) et un ou plusieurs canaux de sortie (14), ledit clapet (15, 16, 17) étant logé dans la pièce rapportée (11).
     
    4. Pointe de forage (1) selon la revendication 3, dans laquelle le clapet comprend : un corps de clapet, de préférence une bille (15), un siège de clapet (16) et un ressort (17) poussant le corps de clapet (15) sur le siège de clapet (16).
     
    5. Pointe de forage (1) selon la revendication 4, dans laquelle le siège de clapet (16) est vissé dans la pièce rapportée (11), de préférence depuis le côté du raccord (12) pour la conduite d'alimentation (13) pour un liquide.
     
    6. Pointe de forage (1) selon l'une quelconque des revendications précédentes, dans laquelle la pièce rapportée (11) au niveau de son côté externe est pourvue d'un organe de fixation, de préférence d'un anneau de levage (18), pour des moyens de levage.
     
    7. Pointe de forage (1) selon l'une quelconque des revendications précédentes, dans laquelle le corps de forme conique (2) et/ou la pièce rapportée (11) sont réalisés en acier coulé.
     
    8. Pointe de forage (1) selon l'une quelconque des revendications précédentes, dans laquelle la pièce rapportée (11) comprend un ou plusieurs canaux de sortie (14) pour le liquide, en particulier deux canaux (14) ou plus s'étendant dans une direction radiale ou au moins une direction ayant une composante radiale et/ou répartis de façon régulière le long de la circonférence de la pièce rapportée (11).
     
    9. Pointe de forage (1) selon l'une quelconque des revendications précédentes, dans laquelle l'ouverture centrale (10) et la pièce rapportée (11) comprennent au moins un élément déterminant l'orientation de la pièce rapportée (11) dans l'ouverture (10).
     
    10. Pièce rapportée (11) pour une pointe de forage (1) pour un appareil de forage à refoulement de sol permettant de produire un pieu de fondation, comprenant un raccord (12) pour une conduite d'alimentation (13) pour un liquide, en particulier un coulis, un ou plusieurs canaux de sortie (14) pour ledit liquide, en particulier deux canaux (14) ou plus s'étendant dans une direction radiale ou au moins une direction ayant une composante radiale et/ou répartis de façon régulière le long de la circonférence de la pièce rapportée (11), et un clapet, de préférence un clapet antiretour (15, 16, 17), entre le raccord (12) pour la conduite d'alimentation (13) et un ou plusieurs canaux de sortie (14).
     
    11. Pièce rapportée (11) selon la revendication 10, dans laquelle le clapet comprend : un corps de clapet, de préférence une bille (15), un siège de clapet (16) et un ressort (17) poussant le corps de clapet (15) sur le siège de clapet (16).
     
    12. Pièce rapportée (11) selon la revendication 11, dans laquelle le siège de clapet (16) est vissé dans la pièce rapportée (11), de préférence depuis le côté du raccord (12) pour le liquide.
     
    13. Pièce rapportée (11) selon l'une quelconque des revendications 10 à 12, dans laquelle la pièce rapportée (11) au niveau de son côté externe est pourvue d'un organe de fixation, de préférence d'un anneau de levage (18), pour des moyens de levage.
     
    14. Pièce rapportée (11) selon l'une quelconque des revendications 11 à 13, dans laquelle la pièce rapportée (11) est réalisée en acier coulé.
     
    15. Nécessaire (2, 11) permettant de produire une pointe de forage (1) pour un appareil de forage à refoulement de sol, ledit nécessaire comprenant : un corps de forme sensiblement conique (2) qui est pourvu d'une ouverture centrale (10) et d'une pièce rapportée (11) selon l'une quelconque des revendications 11 à 14.
     




    Drawing











    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description