NL2027127B1 - Ground Drill for Drilling a Bore Hole - Google Patents

Ground Drill for Drilling a Bore Hole Download PDF

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Publication number
NL2027127B1
NL2027127B1 NL2027127A NL2027127A NL2027127B1 NL 2027127 B1 NL2027127 B1 NL 2027127B1 NL 2027127 A NL2027127 A NL 2027127A NL 2027127 A NL2027127 A NL 2027127A NL 2027127 B1 NL2027127 B1 NL 2027127B1
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NL
Netherlands
Prior art keywords
axis
drill
cutting
longitudinal
auxiliary
Prior art date
Application number
NL2027127A
Other languages
Dutch (nl)
Inventor
Jan Steinbusch Peter
Original Assignee
Van Oord Offshore Wind B V
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Filing date
Publication date
Application filed by Van Oord Offshore Wind B V filed Critical Van Oord Offshore Wind B V
Priority to NL2027127A priority Critical patent/NL2027127B1/en
Priority to PCT/NL2021/050770 priority patent/WO2022131916A1/en
Priority to EP21830352.7A priority patent/EP4263998A1/en
Application granted granted Critical
Publication of NL2027127B1 publication Critical patent/NL2027127B1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/002—Drilling with diversely driven shafts extending into the borehole

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

A ground drill for drilling a borehole in the ground, the ground drill having a longitudinal drill axis extending along the borehole and a drill end associated with a bore hole end having a bore hole end surface transverse to the longitudinal drill axis while drilling, the drill end being configured for advancing the bore hole end surface while drilling. The drill end comprises a cutter head and optionally an auxiliary cutter head, each of them rotatable around a respective cutter axis and defining a cutter surface around it. The cutter axes and the cutter surfaces are configured to remove, while drilling, a slice area ofthe bore hole end surface extending from the longitudinal drill axis in a direction of a circumference of the borehole. The ground drill removes a circular area of the bore hole end surface by the effect of the combined rotations ofthe cutter heads around the cutter axes and the longitudinal drill axis.

Description

-1 = Ground Drill for Drilling a Bore Hole
FIELD OF THE INVENTION
[1] The present invention relates to a ground drill for drilling a borehole in the ground, the ground drill having a longitudinal drill axis extending along the borehole and a drill end associated with a bore hole end having a bore hole end surface transverse to the longitudinal drill axis while drilling, wherein the drill end is configured for advancing the bore hole end surface while drilling. The ground can be the soil of a water body bed, as a sea, ocean, lake or river bed.
BACKGROUND OF THE INVENTION
[2] The worldwide growing interest in alternative energies led also to an increasing demand for the installation of on- and offshore wind turbines. Although driven piles are extensively used to fix the support structures of wind turbines, in some soil conditions the use of driven piles is not advisable nor possible also in view of preventing nuisance to the surrounding environment.
[31 In view of this, it is sometimes necessary to install pile anchoring support structures to the soil or monopiles supporting wind turbines in pre-drilled boreholes. Therefore, several drilling techniques have been developed according to the different soil profiles or characteristics.
[4] Depending on the nature of the soil and of the size of the borehole to be drilled, conventional drilling techniques involve the use of drill buckets having bullet-shaped drill teeth, cluster drills having several individual hammers combined in a single barrel, and core barrels having, at the bottom end, rotating drill bits and vertical shaft boring machines having toothed cutter heads.
[5] Conventional drills are equipped with fixed drilling teeth or with drill bits that are made to roll by the rotation of the drill itself. The rolling of the drill bits over the surface of the rock allows the creation of a borehole. During drilling operations, the borehole is filled with water to allow a suction mouth installed in the core barrel to remove the rock debris.
[6] The drilling rate of a core barrel drill on a soil of medium hardness is limited by the fact that the rock crushing is passively performed by the drill bits which rotate uniquely because of the rotation of the barrel itself. In addition, due to the often inefficient suction system, the removal of the rock debris by such devices may not be optimal so that the rock could be repeatedly crushed.
[7] Vertical shaft boring machines are used to create boreholes in soft soils with diameters ranging from 5 m to 18 m. Such machines comprise a rotatable toothed cutter head attached to a movable hydraulically operated arm. The arm moves the cutter head so as to cover the whole borehole surface. The rotation of the toothed cutter head on the soil allows the crushing of the rock and the excavation of the borehole.
40 [8] The major limitation of a vertical shaft boring machine is that the cutter head
-2 = needs to be continuously moved to cover the entire borehole. This implies a considerably time-consuming process and, therefore, a reduction in the productivity. In addition, risks of breakdowns of hydraulically operated arms are considerable.
[9] For these reasons, a drill having at least one cutter head at its bottom end configured to cover the whole borehole surface, wherein the at least one cutter head is powered by an independent motor and is equipped with its own suction mouth, would overcome the inefficiencies of both the barrel drill and the vertical shaft boring machine.
SUMMARY OF THE INVENTION
[10] It is an objective of the invention to provide an apparatus overcoming at least some of the above-identified disadvantages of the known devices to drill a borehole in the soil.
[11] It is another or alternative objective of the invention to provide an alternative device to excavate a borehole in the soil.
[12] It is yet another or alternative objective of the invention to provide a device having a higher drill rate compared to a conventional barrel drill with bits.
[13] It is yet another or alternative objective of the invention to provide a device having a higher drill efficiency by avoiding a repeatedly crush of already cut rock.
[14] It is yet another or alternative objective of the invention to provide a device ensuring a more effective suction of the rock debris than a conventional drill.
[15] It is yet another or alternative objective of the invention to provide a device allowing a higher productivity by reducing the time needed to drill a borehole of same diameter with respect to already known drill devices.
[16] It is yet another or alternative objective of the invention to provide a device ensuring a continuous drill rate.
[17] It is yet another or alternative objective of the invention to provide a device improving time and energy efficiency of cutting operations by decoupling the force provided for cutting rocks and the force provided for rotating the drill head.
[18] At least one of the above objectives is achieved by a ground drill for drilling a borehole in the ground, the ground drill having a longitudinal drill axis extending along the borehole and a drill end associated with a bore hole end having a bore hole end surface transverse to the longitudinal drill axis while drilling, wherein the drill end is configured for advancing the bore hole end surface while drilling. The drill end comprises a cutter head drivable to rotate around a cutter axis and defining a cutter surface around the cutter axis, wherein the cutter axis is directed along a direction intersecting the longitudinal drill axis, wherein the cutter axis and the cutter surface are configured and arranged for removing by the cutter surface, while drilling, a slice area of the bore hole end surface extending along a radial direction with respect to the longitudinal drill axis, and wherein the cutter head is movable to rotate about the longitudinal drill axis for removal of a circular area of the bore 40 hole end surface around the longitudinal drill axis by combined rotations of the cutter head
-3-= around the cutter axis and the longitudinal drill axis in a single full rotation of the cutter head around the longitudinal drill axis.
[19] In an embodiment, the cutter axis and the cutter surface are configured and arranged for removing by the cutter surface, while drilling, a slice area of the bore hole end surface extending from the longitudinal drill axis in a direction of a circumference of the bore hole.
[20] In an embodiment, the cutter head is configured such that the circular area of the bore hole end surface removed by the cutter head has a diameter greater than a diameter of the ground drill.
[21] In an embodiment, a distance of the cutter surface to the cutter axis increases along the cutter axis from a first end to a second end of the cutter head.
[22] In an embodiment, the cutter surface defines a conical-like shape.
[23] In an embodiment, the first end of the cutter head is associated with the longitudinal drill axis.
[24] In an embodiment, the cutter head is driven to rotate around the longitudinal axis and the cutter axis by means of separate motors.
[25] In an embodiment, the ground drill comprises a non-rotating section configured for, in use, advancing in the borehole while not being rotated about the longitudinal drill axis and a rotating section arranged on the non-rotating section to allow rotation about the longitudinal drill axis with respect to the non-rotating section, the rotating section providing the drill end.
[26] In an embodiment, a suction arrangement comprising a suction mouth is arranged to be associated with the cutter head for removing cut material from the bore hole end surface.
[27] In an embodiment, the drill end comprises an auxiliary cutter head drivable to rotate around an auxiliary cutter axis and defining an auxiliary cutter surface around the auxiliary cutter axis, wherein the auxiliary cutter axis is directed along a direction intersecting the longitudinal drill axis, wherein the auxiliary cutter axis and the auxiliary cutter surface are configured and arranged for removing by the auxiliary cutter surface, while drilling, a slice area of the bore hole end surface extending from the circumference of the borehole in a direction of the longitudinal drill axis, and wherein the auxiliary cutter head is movable to rotate about the longitudinal drill axis for removal of an annular area of the bore hole end surface around the longitudinal drill axis by combined rotations of the auxiliary cutter head around the auxiliary cutter axis and the longitudinal drill axis in a single full rotation of the auxiliary cutter head around the longitudinal drill axis.
[28] In an embodiment, a distance of the auxiliary cutter surface to the auxiliary cutter axis increases along the auxiliary cutter axis from a first end to a second end of the auxiliary cutter head.
[29] In an embodiment, the auxiliary cutter surface defines a conical-like shape.
40 [30] In an embodiment, the first end of the auxiliary cutter head is associated with
-4— the longitudinal drill axis.
[31] In an embodiment, the auxiliary cutter head is driven to rotate around the longitudinal axis and the auxiliary cutter axis by means of separate motors, and the rotation of the cutter head around the cutter axis and rotation of the auxiliary cutter head around the auxiliary cutter axis are driven by separate motors.
[32] In an embodiment, the auxiliary cutter head is adjustable in a radial direction with respect to the longitudinal drill axis.
[33] In an embodiment, the auxiliary cutter axis and the auxiliary cutter surface are configured and arranged so that the annular area of the bore hole end surface removed by the auxiliary cutter head has an inner radius smaller than or equal to the outer radius of the circular area of the bore hole end surface removed by the cutter head
[34] In an embodiment, the auxiliary cutter axis and the auxiliary cutter surface are configured and arranged so that the annular area of the bore hole end surface removed by the auxiliary cutter head is greater than the diameter of the ground drill.
[35] In an embodiment, a rotational speed of each one of the cutter head and the auxiliary cutter head around a respective cutter axis is greater than a rotational speed of each one of the cutter head and the auxiliary cutter head around the longitudinal drill axis.
[36] In an embodiment, a suction mouth of a suction arrangement is arranged to be associated with a respective one of the cutter heads for removing drilled material from the drill end.
[37] In an embodiment, the suction arrangement comprises an opening or a jet for introducing water into the bore hole.
BRIEF DESCRIPTION OF THE DRAWINGS
[38] Further features and advantages of the invention will become apparent from the description of the invention by way of non-limiting and non-exclusive embodiments. These embodiments are not to be construed as limiting the scope of protection. The person skilled in the art will realize that other alternatives and equivalent embodiments of the invention can be conceived and reduced to practice without departing from the scope of the present invention. Embodiments of the invention will be described with reference to the accompanying drawings, in which like or same reference symbols denote like, same or corresponding parts, and in which Figure 1 shows a schematic view of a ground drill operating in a borehole, according to an embodiment of the invention; Figure 2A shows a schematic section along a plane comprising the longitudinal drill axis of a drill end of a ground drill, according to an embodiment of the invention; Figure 2B shows a top view of a borehole during drilling operations, according to an embodiment of the invention; Figure 3A shows a section of a ground drill along the longitudinal drill axis, according 40 to an embodiment of the invention, wherein the ground drill comprises a non-rotating section
-5- and a rotating section and wherein the drill end comprises a cutter head or a cutter head and an auxiliary cutter head; Figure 3B shows a top view of the bore hole during drilling operations, according to an embodiment of the invention, wherein the drill end of the ground drill comprises a cutter head or a cutter head and an auxiliary cutter head; and Figure 3C shows a top view of the rotating section during drilling operations, according to an embodiment of the invention, wherein the drill end of the ground drill comprises a suction mouth fixed to the cutter head and/or an auxiliary suction mouth fixed to the auxiliary cutter head.
DETAILED DESCRIPTION OF EMBODIMENTS
[39] The following detailed description is made in relation to a ground drill for drilling a bore hole in the ground. The bore hole has a cylindrical shape having a symmetry axis. The symmetry axis of the bore hole generally follows the vertical direction. Alternatively, the symmetry axis may form any angle with respect to the vertical direction. In some applications, the symmetry axis of the bore hole may be substantially horizontal. The bore hole comprises a bore hole end surface transverse with respect to the symmetry axis. The embodiments will be described with reference to “soil” but generally apply to all kinds of soil, rock and ground. In addition, the term “soil” can be applied to the soil of a water body bed, as a sea, ocean, lake or river bed.
[40] During drilling operations, the ground drill is generally sustained by a surface- located device capable of holding the ground drill upright and configured to advance or retract the ground drill along the symmetry axis of the bore hole. In addition, the surface- located device may be arranged to allow the insertion of a casing down into the bore hole so as to prevent its collapse.
[41] Figure 1 schematically shows a section of a ground drill 1, inserted in a bore hole B, along a plane containing the longitudinal drill axis A of the ground drill 1. The bore hole B is reinforced by means of a hollow cylindrical reinforcing casing RC to prevent the collapsing of the bore hole B. The reinforcing casing RC is made to slide through the bore hole B during drilling operations. The ground drill 1 is stabilized in the borehole by means of stabilizers DS protruding from the ground drill 1 in a direction perpendicular to the longitudinal axis A and at contact with the reinforcing casing RC. The ground drill has a drill end 10 associated with a bottom end BE of the bore hole B. The drill end 10 is shown in more details in Figure 2A depicting a section along the longitudinal axis A of the ground drill 1 inserted in the bore hole B. The drill end 10 can be rotated around the longitudinal drill axis A for advancing the bore hole end surface BS of the bore hole B while drilling the bore hole. The bore hole end surface BS is transverse to the longitudinal axis A. The drill end 10 comprises a cutter head 11 drivable to rotate around a cutter axis C and defining a cutter 40 surface CS around the cutter axis C. The angle formed between the cutter axis C and the
-6 — longitudinal drill axis A is such that the cutter surface CS is parallel to the bore hole end surface BS. As shown in Figure 2B, displaying a top view of the borehole end surface BS during drilling operations, the cutter head 11 is configured to remove a slice area SC of the bore hole end surface BS extending from the longitudinal drill axis A in a direction of a circumference of the bore hole B. The cutter head 11 is configured to remove a circular area CC of the bore hole end surface around the longitudinal drill axis A by combined rotations of the cutter head 11 around the cutter axis C and around the longitudinal drill axis A in a single full rotation of the cutter head 11 around the longitudinal drill axis A.
[42] To perform the excavation of the bore hole B, the ground drill 1 is lowered so as to contact the soil with its drill end 10. Alternatively, the ground drill 1 is lowered into a pre- existing bore hole B to contact with its drill end 10 the bore hole end surface BS. The drill end 10 is then made to rotate around the longitudinal drill axis A and the cutter head 11 is additionally made to rotate around the cutter axis C. The rotation of the cutter head 11 allows the cutting of the soil. The combined rotations of the drill end 10 around the longitudinal drill axis A and of the cutter head 11 around the cutter axis C allow the coverage of the circular area CC corresponding to the whole bore hole end surface, i.e. allow the cutting of the soil of the whole bore hole end surface BS and the excavation of the bore hole B. The cutter head 11 can be configured, i.e. dimensioned and/or positioned, such that the circular area CC of the bore hole end surface BS removed by the cutter head 11 has a diameter greater than the diameter of the ground drill so as to allow the underreaming of the drill housing and to facilitate the insertion of the reinforcing casing RC.
[43] A distance d of the cutter surface CS to the cutter axis C increases along the cutter axis C from a first end to a second end of the cutter head 11. The cutter head 11 has a conical-like shape. The first end of the cutter head 11 is associated with the longitudinal drill axis A, which is intended to mean that the first end of the cutter head 11 is at a proximal position with respect to the longitudinal drill axis A and the second end of the cutter head 11 is at a distal position with respect to the longitudinal drill axis A. The first end of the cutter head 11 extends slightly beyond the longitudinal drill axis A so that the projection of the first end of the cutter head 11 onto the bore hole end surface substantially corresponds to the projection of the longitudinal drill axis A onto the bore hole end surface. In this way, the slice SC of soil removed by the rotation of the cutter head 11 around the cutter head axis C starts at the center of the bore hole end surface BS, and the circular area on the bore hole end surface swept by the cutter head 11 after a complete rotation of the drill end 10 around the longitudinal axis A corresponds to the whole bore hole end surface.
[44] In the embodiment shown, the cutter head 11 is driven to rotate around the cutter axis C by a cutter head motor 14 and the drill end 10 is driven to rotate around the longitudinal axis by a drill end motor, wherein the cutter head motor 14 is different from the drill end motor, i.e. the cutter head 11 is driven to rotate around the longitudinal axis A and the cutter axis C by means of separate motors. The rotational speed of the cutter head 11 40 around the cutter axis C is higher that the rotational speed of the ground drill 1 around the
-7 = longitudinal drill axis A. Generally, the cutter head 11 rotates around the cutter axis at a rotational speed up to 50 rpm and the drill end 10 rotates around the longitudinal drill axis A at a rotational speed up to 1 rpm.
[45] In the embodiment shown in Figure 2A, the ground drill 1 comprises a non- rotating section 12 configured for, in use, advancing in the bore hole B while not being rotated about the longitudinal drill axis A and a rotating section 13 arranged on the non- rotating section 12 to allow rotation about the longitudinal drill axis A with respect to the non- rotating section 12. The rotating section 13 provides the drill end 10. Usually, the non-rotating section 12 has a longitudinal size greater than the longitudinal size of the rotating section 13. The non-rotating section 12 can have a dimension, transversal to the longitudinal drill axis, smaller than a transversal dimension of the rotating section 13. The non-rotating section 12 may be used for the allocation of equipment useful for the functioning of the drill end 10 and for the rotation of the rotating section 12, such as a drill end motor.
[46] In an embodiment, a suction arrangement comprising a suction mouth 15 is arranged to be associated with the cutter head 11 for removing cut material from the bore hole end surface BS. During a drilling operation, the soil cut by the cutter head remains as debris on the bore hole end surface. To avoid to repeatedly crushing such debris, it is advantageous to remove it by making use of the suction mouth. The suction arrangement is arranged to be at a fixed position with respect to the cutter head 11 and may be configured to introduce water into the bore hole through an opening or a jet fixed. Additionally, the suction arrangement is arranged to be fixed to the rotating section 13. The introduction of water into the bore hole allows the suction of the cut soil on the bore hole end surface. In case water is introduced into the bore hole by means of a jet, the water jet may be directed towards the cutter head 11 so as to allow the cleaning of the cutter head 11 from soil debris.
[47] In the embodiment shown in Figure 3A, the drill end 10 additionally comprises an auxiliary cutter head 11a drivable to rotate around an auxiliary cutter axis Ca and defining an auxiliary cutter surface CSa around the auxiliary cutter axis Ca, directed along a direction intersecting the longitudinal drill axis A. The rotating section 13 is partly received within the lower end of the non-rotating section 12, and rotatable with respect to the non-rotating section 12 by a motor 13.1.
[48] Figure 3B shows a top view of the borehole during drilling operations using the ground drill shown in Figure 3A. The auxiliary cutter axis Ca and the auxiliary cutter surface CSa are configured and arranged for removing by the auxiliary cutter surface CSa a slice area SCa of the bore hole end surface BS extending from the circumference of the bore hole end surface BS in a direction of the longitudinal drill axis A, i.e. the slice area SCa swept by the auxiliary cutter surface is an annular area AC of the bore hole end surface BS. The auxiliary cutter head 11a is movable to rotate about the longitudinal drill axis A for removal of the annular area AC of the bore hole end surface around the longitudinal drill axis by combined rotations of the auxiliary cutter head 11a around the auxiliary cutter axis Ca 40 and the longitudinal drill axis A in a single full rotation of the auxiliary cutter head around the
-8- longitudinal drill axis.
[49] The distance of the auxiliary cutter surface CSa to the auxiliary cutter axis Ca increases along the auxiliary cutter axis Ca from a first end to a second end of the auxiliary cutter head 11a. The auxiliary cutter surface 11a defines a conical-like shape.
[50] The first end of the auxiliary cutter head 11a is associated with the longitudinal drill axis A, which is intended to mean that the first end of the auxiliary cutter head 11a is at a proximal position with respect to the longitudinal drill axis A and the second end of the auxiliary cutter head 11a is at a distal position with respect to the longitudinal drill axis A.
[51] The auxiliary cutter head 11a is driven by an auxiliary cutter head motor 14a different from the cutter head motor 14 and different from the drill end motor, i.e. the auxiliary cutter head 11a is driven to rotate around around the longitudinal axis A and the auxiliary cutter axis Ca. The rotational speed of the auxiliary cutter head 11a around the auxiliary cutter axis Ca is higher that the rotational speed of the ground drill 1 around the longitudinal drill axis A. Generally, the auxiliary cutter head 11a rotates around the auxiliary cutter axis Ca at a rotational speed up to 50 rpm and the ground drill 1 rotates around the longitudinal drill axis A at a rotational speed up to 1 rpm.
[52] In the embodiment shown, the auxiliary cutter head 11a is adjustable in a radial direction with respect to the longitudinal drill axis A. The auxiliary cutter head 11a is movable along the radial direction with respect to the longitudinal drill axis A by means of an actuator 17, which allows setting the radius of the bore hole. Generally, the cutter head 11 could be made adjustable in a same manner as well. A complete coverage of the bore hole end surface BS is obtained by combining the rotation of the drill end 10 around the longitudinal drill axis A, the rotation of the cutter head 11 around the cutter axis C, the rotation of the auxiliary cutter head 11a around the auxiliary cutter axis Ca and, when the radius of the bore hole B is set, the translation of the auxiliary cutter head 11a along the radial direction with respect to the longitudinal drill axis A.
[53] The circular and annular bore hole end surfaces areas removed by the cutter head 11 and the auxiliary cutter head 11a are complementary so as to cover the whole bore hole end surface. The auxiliary cutter axis Ca and the auxiliary cutter surface CSa are configured and arranged so that the annular area AC of the bore hole end surface BS removed by the auxiliary cutter head 11a has an inner radius smaller than or equal to the outer radius of the circular area CC of the bore hole end surface BS removed by the cutter head. The auxiliary cutter axis and the auxiliary cutter surface can be configured and arranged so that the annular area AC of the bore hole end surface BS removed by the auxiliary cutter head 11a is greater than the diameter of the ground drill 1, which can be set by appropriately driving the actuator 17, so as to allow underreaming.
[54] In the embodiment shown, a suction arrangement 16 is arranged to be associated with the cutter head 11 and the auxiliary cutter head 11a for removing drilled material from the bore hole end surface BS. The suction arrangement 16 is arranged to be 40 at a fixed position with respect to the cutter head 11 and to the auxiliary cutter head 11a and
-9- may comprise an opening or a jet for introducing water into the bore hole. Additionally, the suction arrangement is arranged to be fixed to the rotating section 13. The introduction of water into the bore hole allows the suction of the crushed soil on the bore hole end surface. In case water is introduced into the bore hole by means of a jet, the water jet may be directed towards the auxiliary cutter head 11a so as to allow the cleaning of the auxiliary cutter head 11a from soil debris. The suction arrangement 16 optionally comprises a suction mouth 15 and/or an auxiliary suction mouth 15a, shown in Fig. 3C, configured to be at a fixed position with respect to the cutter head 11 and the auxiliary cutter head 11a, respectively.
[55] Figure 3C shows a top view of the rotating section 13 during drilling operations on the borehole end surface BS using the ground drill shown in Figure 3A. A suction mouth 15 of the suction arrangement is arranged to be at a fixed position with respect to the cutter head 11 and an auxiliary suction mouth 15a of the suction arrangement is arranged to be at a fixed position with respect to the auxiliary cutter head 11a. The suction mouth 15 and the auxiliary suction mouth 15a are in fluid connection with the suction arrangement 16, not shown in this figure, and allow the introduction of water into the borehole and the suction of the crushed soil on the bore hole end surface BS.

Claims (20)

-10 - CONCLUSIES-10 - CONCLUSIONS 1. Een grondboor (1) voor het boren van een boorgat (B) in de grond, waarbij de grondboor heeft een longitudinale booras (A) die zich uitstrekt langs het boorgat en een booruiteinde (10) geassocieerd met een boorgateind (BE) dat heeft een boorgateindoppervlak (BS) dwars op de longitudinale booras tijdens het boren, waarbij het booruiteinde (10) is geconfigureerd om het boorgateindoppervlak voort te bewegen tijdens het boren, en waarbij het booruiteinde (10) omvat een snijkop (11) die kan worden aangedreven om te roteren rond een snijas (C) en een snijoppervlak (CS) rond de snijas definieert, waarbij de snijas is gericht langs een richting die de longitudinale booras snijdt, waarbij de snijas en het snijoppervlak zijn geconfigureerd en aangebracht voor het verwijderen door het snijoppervlak, tijdens het boren, van een plakgebied (SC) van het boorgateindoppervlak dat zich uitstrekt langs een radiale richting ten opzichte van de longitudinale booras (A), en waarbij de snijkop kan worden bewogen om te roteren rond de longitudinale booras voor het verwijderen van een cirkelvormig gebied (CC) van het boorgateindoppervlak rond de longitudinale booras door gecombineerde rotaties van de snijkop rond de snijas en de longitudinale booras in een enkele volledige rotatie van de snijkop rond de longitudinale booras.An auger (1) for drilling a borehole (B) in the ground, the auger having a longitudinal drill axis (A) extending along the borehole and a drill end (10) associated with a borehole end (BE) which has a bore end surface (BS) transverse to the longitudinal drill axis during drilling, the drill end (10) being configured to advance the bore end surface during drilling, and the drill end (10) comprises a cutting head (11) which can be driven to rotate about a cutting axis (C) and defining a cutting surface (CS) about the cutting axis, the cutting axis being oriented along a direction that intersects the longitudinal drilling axis, the cutting axis and the cutting surface configured and arranged for removal through the cutting surface during drilling, a sticking area (SC) of the borehole end surface extending along a radial direction relative to the longitudinal drilling axis (A), and wherein the cutting head can be used eweighed to rotate about the longitudinal drilling axis to remove a circular area (CC) of the borehole end surface about the longitudinal drilling axis by combined rotations of the cutting head about the cutting axis and the longitudinal drilling axis in a single full rotation of the cutting head about the longitudinal drilling axis . 2. Grondboor volgens de voorgaande conclusie, waarbij de snijas (C) en het snijoppervlak (CS) geconfigureerd en aangebracht zijn voor het verwijderen door het snijoppervlak, tijdens het boren, van een plakgebied (SC) van het boorgateindoppervlak dat zich uitstrekt vanaf de longitudinale booras (A) in een richting van een omtrek van het boorgat.The auger according to the preceding claim, wherein the cutting shaft (C) and the cutting surface (CS) are configured and arranged to remove by the cutting surface, during drilling, a sticking region (SC) of the borehole end surface extending from the longitudinal drilling axis (A) in a direction of a circumference of the borehole. 3. Grondboor volgens een van de voorgaande conclusies, waarbij de snijkop zodanig is geconfigureerd dat het cirkelvormige gebied (CC) van het boorgateindoppervlak (BS) verwijderd door de snijkop een diameter heeft die groter is dan een diameter van de grondboor.The auger according to any preceding claim, wherein the cutting head is configured such that the circular area (CC) of the borehole end surface (BS) removed by the cutting head has a diameter greater than a diameter of the auger. 4. Grondboor volgens een van de voorgaande conclusies, waarbij een afstand (d) van het snijoppervlak (CS) tot de snijas (CA) langs de snijas toeneemt van een eerste einde naar een tweede einde van de snijkop.An auger according to any one of the preceding claims, wherein a distance (d) from the cutting surface (CS) to the cutting axis (CA) increases along the cutting axis from a first end to a second end of the cutting head. 5. Grondboor volgens de voorgaande conclusie, waarbij het snijoppervlak een conische vorm definieert.Earth auger according to the preceding claim, wherein the cutting surface defines a conical shape. 40 40 6. Grondboor volgens een van de voorgaande twee conclusies, waarbij het6. Earth auger according to one of the preceding two claims, wherein the -11 - eerste uiteinde van de snijkop is geassocieerd met de longitudinale booras.-11 - first end of the cutting head is associated with the longitudinal drilling axis. 7. Grondboor volgens een der voorgaande conclusies, waarbij de snijkop roterend wordt aangedreven om de longitudinale as (A) en de snijas (C) door middel van afzonderlijke motoren.An auger according to any one of the preceding claims, wherein the cutting head is rotationally driven about the longitudinal axis (A) and the cutting axis (C) by means of separate motors. 8. Grondboor volgens een van de voorgaande conclusies, waarbij de grondboor omvat een niet-roterende sectie (12} dat is geconfigureerd om, in gebruik, voort te bewegen in het boorgat terwijl het niet wordt geroteerd om de longitudinale booras en een roterende sectie (13) aangebracht op de niet-roterende sectie om rotatie om de longitudinale booras mogelijk te maken ten opzichte van de niet-roterende sectie, waarbij de roterende sectie het booruiteinde vormt.An auger according to any preceding claim, wherein the auger comprises a non-rotating section (12} configured to, in use, advance in the borehole while not being rotated about the longitudinal drill axis and a rotating section ( 13) mounted on the non-rotating section to allow rotation about the longitudinal drilling axis relative to the non-rotating section, the rotating section forming the drill end. 9. Grondboor volgens een der voorgaande conclusies, waarbij een zuiginrichting (16) omvattende een zuigmond (15) is aangebracht om te zijn geassocieerd met de snijkop voor het verwijderen van geboord materiaal van het boorgateindoppervlak.An auger according to any one of the preceding claims, wherein a suction device (16) including a suction nozzle (15) is arranged to be associated with the cutting head for removing drilled material from the borehole end surface. 10. Grondboor volgens een van de voorgaande conclusies, waarbij het booruiteinde is voorzien van een hulpsnijkop (11a) die kan worden aangedreven om te roteren rond een hulpsnijas (Ca) en een hulpsnijopperviak (CSa) definieert rond de hulpsnijas, waarbij de hulpsnijas is gericht langs een richting die de longitudinale booras snijdt, waarbij de hulpsnijas (Ca) en het hulpsnijoppervlak (CSa) zijn geconfigureerd en aangebracht voor het verwijderen door het hulpsnijoppervlak, tijdens het boren, van een plakgebied (SCa) van het boorgateindoppervlak dat zich uitstrekt vanaf de omtrek van het boorgat in een richting van de longitudinale booras, en waarbij de hulpsnijkop beweegbaar is om te roteren rond de longitudinale booras voor het verwijderen van een ringvormig gebied (AC) van het boorgateindoppervlak rond de longitudinale booras door gecombineerde rotaties van de hulpsnijkop rond de hulpsnijas en de longitudinale booras in een enkele volledige rotatie van de hulpsnijkop rond de longitudinale booras.An auger according to any one of the preceding claims, wherein the drill tip includes an auxiliary cutting head (11a) operable to rotate about an auxiliary cutting axis (Ca) and defining an auxiliary cutting surface (CSa) about the auxiliary cutting axis, the auxiliary cutting axis being oriented along a direction intersecting the longitudinal drilling axis, wherein the auxiliary cutting axis (Ca) and the auxiliary cutting surface (CSa) are configured and arranged to remove by the auxiliary cutting surface, during drilling, a sticking region (SCa) of the borehole end surface extending from the circumference of the bore in a direction of the longitudinal drilling axis, and wherein the auxiliary cutting head is movable to rotate about the longitudinal drilling axis to remove an annular region (AC) of the bore end surface about the longitudinal drilling axis by combined rotations of the auxiliary cutting head about the auxiliary cutting axis and the longitudinal drilling axis in a single full rotation of the auxiliary cutting head around the longitudinal nal drill shaft. 11. Grondboor volgens de voorgaande conclusie, waarbij een afstand van het hulpsnijopperviak tot de hulpsnijas toeneemt langs de hulpsnijas vanaf een eerste uiteinde naar een tweede uiteinde van de hulpsnijkop.The auger according to the preceding claim, wherein a distance from the auxiliary cutting surface to the auxiliary cutting axis increases along the auxiliary cutting axis from a first end to a second end of the auxiliary cutting head. 12. Grondboor volgens de voorgaande conclusie, waarbij het hulpsnijoppervlak een conische vorm definieert. 40 13. Grondboor volgens een der voorgaande drie conclusies, waarbij het eersteAn auger according to the preceding claim, wherein the auxiliary cutting surface defines a conical shape. 13. Earth auger according to any one of the preceding three claims, wherein the first -12 - uiteinde van de hulpsnijkop is geassocieerd met de longitudinale booras.-12 - end of the auxiliary cutting head is associated with the longitudinal drilling axis. 14. Grondboor volgens een van de voorgaande vier conclusies, waarbij de hulpsnijkop roterend wordt aangedreven om de longitudinale as en de hulpsnijas door middel van afzonderlijke motoren, en waarbij de rotatie van de snijkop om de snijas en de rotatie van de hulpsnijkop om de hulpsnijas worden aangedreven door afzonderlijke motoren.An auger according to any one of the preceding four claims, wherein the auxiliary cutting head is rotationally driven about the longitudinal axis and the auxiliary cutting axis by means of separate motors, and wherein the rotation of the cutting head about the cutting axis and the rotation of the auxiliary cutting head about the auxiliary cutting axis are controlled. powered by separate motors. 15. Grondboor volgens een van de voorgaande vijf conclusies, waarbij de hulpsnijkop ten opzichte van de longitudinale booras in radiale richting verstelbaar is.An auger according to any one of the preceding five claims, wherein the auxiliary cutting head is adjustable in radial direction relative to the longitudinal drilling axis. 16. Grondboor volgens een van de voorgaande zes conclusies, waarbij de hulpsnijas en het hulpsnijoppervlak zo zijn geconfigureerd en aangebracht dat het ringvormige gebied van het boorgateindoppervlak verwijderd door de hulpsnijkop een binnenradius heeft die kleiner is dan of gelijk is aan de buitenste straal van het cirkelvormige gebied van het boorgateindoppervlak verwijderd door de snijkop.An auger according to any one of the preceding six claims, wherein the auxiliary cutting shaft and auxiliary cutting surface are configured and arranged such that the annular region of the borehole end surface removed by the auxiliary cutting head has an inner radius that is less than or equal to the outer radius of the circular area of the bore end surface removed by the cutting head. 17. Grondboor volgens een van de voorgaande zeven conclusies, waarbij de hulpsnijas en het hulpsnijoppervlak zo zijn geconfigureerd en aangebracht dat het ringvormige gebied van het boorgateindopperviak verwijderd door de hulpsnijkop groter is dan de diameter van de grondboor.The auger according to any one of the preceding seven claims, wherein the auxiliary cutting shaft and auxiliary cutting surface are configured and arranged such that the annular area of the borehole end cap surface removed by the auxiliary cutting head is greater than the diameter of the auger. 18. Grondboor volgens een van de voorgaande conclusies, waarbij een rotatiesnelheid van elk van de snijkop en de hulpsnijkop rond een respectieve snijas groter is dan een rotatiesnelheid van elk van de snijkop en de hulpsnijkop rond de longitudinale booras.An auger according to any one of the preceding claims, wherein a rotational speed of each of the cutting head and the auxiliary cutting head about a respective cutting axis is greater than a rotational speed of each of the cutting head and the auxiliary cutting head about the longitudinal drilling axis. 19. Grondboor volgens een van de voorgaande conclusies, waarbij een zuigmond (15) van een zuigopstelling (16) is aangebracht om te zijn geassocieerd met een respectieve snijkop van de snijkoppen voor het verwijderen van geboord materiaal van het booruiteinde.An auger according to any one of the preceding claims, wherein a suction nozzle (15) of a suction arrangement (16) is arranged to be associated with a respective cutting head of the cutting heads for removing drilled material from the drill tip. 20. Grondboor volgens de voorgaande conclusie, waarbij de zuigopstelling een opening of een jet omvat voor het inbrengen van water in het boorgat.An auger according to the preceding claim, wherein the suction arrangement comprises an opening or a jet for introducing water into the borehole.
NL2027127A 2020-12-16 2020-12-16 Ground Drill for Drilling a Bore Hole NL2027127B1 (en)

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PCT/NL2021/050770 WO2022131916A1 (en) 2020-12-16 2021-12-16 Ground drill for drilling a bore hole
EP21830352.7A EP4263998A1 (en) 2020-12-16 2021-12-16 Ground drill for drilling a bore hole

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Citations (3)

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US2976027A (en) * 1955-07-02 1961-03-21 Allimann Georges Drilling-head for the sinking of shafts, galleries and the like
US3219390A (en) * 1963-07-15 1965-11-23 Guy O Conner Apparatus for pulverizing solid materials
US3442341A (en) * 1966-06-09 1969-05-06 Guy O Conner Tools for accurately programming the application of pulverizing energy

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US2994390A (en) * 1956-08-21 1961-08-01 Jersey Prod Res Co Rock bit cutter
US3477762A (en) 1967-08-28 1969-11-11 Eickhoff Geb Mining machine and method
CH672908A5 (en) * 1986-04-15 1990-01-15 Bechem Hannelore
AUPP822499A0 (en) * 1999-01-20 1999-02-11 Terratec Asia Pacific Pty Ltd Oscillating & nutating disc cutter
WO2014032006A1 (en) * 2012-08-23 2014-02-27 Ramax, Llc Drill with remotely controlled operating modes and system and method for providing the same
WO2017106605A1 (en) * 2015-12-17 2017-06-22 Baker Hughes Incorporated Earth-boring tools including passively adjustable, agressiveness-modifying members and related methods

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976027A (en) * 1955-07-02 1961-03-21 Allimann Georges Drilling-head for the sinking of shafts, galleries and the like
US3219390A (en) * 1963-07-15 1965-11-23 Guy O Conner Apparatus for pulverizing solid materials
US3442341A (en) * 1966-06-09 1969-05-06 Guy O Conner Tools for accurately programming the application of pulverizing energy

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