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EP2927417B1 - Couronne de foreuse rotative à percussion ouvrant, en particulier pour le forage de morts-terrains - Google Patents

Couronne de foreuse rotative à percussion ouvrant, en particulier pour le forage de morts-terrains Download PDF

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Publication number
EP2927417B1
EP2927417B1 EP15161307.2A EP15161307A EP2927417B1 EP 2927417 B1 EP2927417 B1 EP 2927417B1 EP 15161307 A EP15161307 A EP 15161307A EP 2927417 B1 EP2927417 B1 EP 2927417B1
Authority
EP
European Patent Office
Prior art keywords
drill bit
drilling
swing
face
wings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP15161307.2A
Other languages
German (de)
English (en)
Other versions
EP2927417A3 (fr
EP2927417A2 (fr
Inventor
Günter Fennel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sysbohr Bohrtechnik fur Den Spezialtiefbau GmbH
Original Assignee
Sysbohr Bohrtechnik fur Den Spezialtiefbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP2927417A2 publication Critical patent/EP2927417A2/fr
Publication of EP2927417A3 publication Critical patent/EP2927417A3/fr
Application granted granted Critical
Publication of EP2927417B1 publication Critical patent/EP2927417B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E21B10/36—Percussion drill 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
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • 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
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • 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
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • E21B10/66—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/03—Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
    • 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
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

  • the invention relates to an opening rotary percussion drill bit, in particular for overlay drilling and a drilling device with a drill bit according to the preambles of the independent claims.
  • Overhead drill bits are used to create a wellbore with a diameter greater than the outside diameter of the tubing to be inserted.
  • opening drill bits are used, which can pierce these earth layers rotary drilling.
  • the movable part of the drill bit is driven to the bottom of the hole by rotation in the working direction of rotation in order to obtain a bore diameter that is greater than the outer diameter of the casing.
  • the cutting edges of these drill bits are usually soldered Carbide plates or fitted with exchangeable round shank bits.
  • the inner rod is also driven by a rotary drive and the impact energy to the drill bit by means of an Imlochhammers (also countersunk hammer, DTH hammer or "down the hole hammer” called), which are operated with air or water is transmitted.
  • Imlochhammers also countersunk hammer, DTH hammer or "down the hole hammer” called
  • DTH hammers then sit at the bottom of the hole between the rotary hammer bit and the inner rod, whereby the energy is supplied through the inner rod.
  • the rocky soil deposits are very powerful, they can cause durability problems the ring bit on the outer linkage be connected.
  • the drill bit for overlay drilling known.
  • the drill bit has a drill head on a drill bit carrier.
  • the drill bit carrier is rotatably connected to a driven inner tube linkage.
  • On the drill head a plurality of symmetrically arranged about its circumference arranged pivot elements which are arranged in the pivoted state in recesses between fixed end faces in the drill head so that they come to rest within the drill head diameter and in the swung-out state by a predetermined amount beyond the Bohrkronen bemesser.
  • each pivoting element is mounted with an eccentrically arranged Bohrkronenthere in the drill head.
  • this percussion drill bit are arranged concentrically arranged folding blades along the Bohrkronenachse rotating. Upon contact at the bottom of the well, the blades are extended by rotation in the direction of travel to obtain a bore diameter greater than the outer diameter of the tubing. If retraction of the folding blades is necessary, for example in a boom extension or after completion of the bore, this requires a rotation counter to the working direction, the folding blades can be retracted and withdrawn through the outer casing. As with the eccentric bits, this retraction is problematic because the drill pipes are threaded, and rotation counter to the working direction is partially associated with loss of drill string, etc., if any threaded joints are loosened.
  • a drill bit is known in which the drill head is formed of two folding wings, which can be pressed apart or collapsed by means of an actuator in order to increase the Bohrradius or to move the drill bit through the casing.
  • This drill bit is due to its construction with many moving parts for controlling the folding blades suitable only for rotary drilling.
  • the actuator would be driven by the introduction of impact energy from the Verrieglungsposition, whereby the folding wings would fold again.
  • a drill bit is known in which the drill head is formed of two folding wings, which pressed apart or collapsed by means of an actuator can be used to increase the Bohrradius or to move the drill bit through the casing.
  • a drill head with a base body in which it has a shaft for connection to a drill pipe and a pilot drill and main drill, wherein the main drill are arranged partially pivotally arranged on the main body cutting strips. At least one cutting edge of the pivotable main drill protrudes in the swung-out state beyond the inner diameter of a guide tube surrounding the drill string and is arranged in the swung-in state within the inner diameter of the guide tube.
  • all main drills are movably arranged on the base body.
  • the folding axis of the main drill is arranged transversely to the longitudinal center line of the base body.
  • a drill bit with a shank having a base body and at least one hingedly mounted on the base body, at least one cutting body having folding blade, the body via the shaft to a guided in a guide tube drill pipe is rotatably connected and wherein each folding edge up to a stop can be folded and is in the folded position within the inner diameter of the guide tube.
  • Each folding blade is supported in the deployed position on a contact surface of the drill bit and is at least a portion of its cutting body outside the outer diameter of the guide tube.
  • the base body has a base plate and at least one non-hinged cutting body, the base plate for each folding edge the stop, the contact surface and a guide, each folding blade about a lying in a direction substantially perpendicular to the drill bit axis plane folding axis substantially radially is arranged foldable and that the distance between each hinged cutting body in the folded position to the drill bit axis is greater than the distance of the folding axis to the drill bit axis.
  • a drill bit with two folding wings which are structurally designed so that when the rotary drill head, the folding wings are driven from a first position to a second position.
  • the object of the invention is to provide a drill bit in which a particularly effective power transmission to the drill bit is done, the movement of the drill bit within a rough is favorable, the change of the Bohrradius simplified and the prior art is improved.
  • Another object is to provide a corresponding drilling device with a drill bit.
  • the invention relates to a drill bit, in particular for overburden drilling, comprising a drill head and a drill bit carrier carrying the drill bit, with at least two folding wings, each of which is reciprocally movable between a first position and a second position, wherein each of the folding wings in the first position within a drill pipe and in the second position projects beyond the Bohrrohr bemesser, and wherein the folding wing at its free end has an end face, preferably with a number of cutting elements.
  • the drill bit is designed in particular as a rotary impact drill bit, which opens after passing through an outer casing and drills larger than the outer diameter of the outer casing measures and finally folds back by simply pulling back.
  • the drill bit has sufficient carbide or similar cutting elements to achieve proper drilling performance.
  • each of the folding wings is arranged transversely to a Bohrkronenoughl Kunststoffsachse pivotally mounted on Bohrkronenitati and is designed so that when rotating drill bit an operative connection with a drilling object generates a torque on the folding wing transverse to Bohrkronenabolmiksachse and the folding wing from the first to the second Position drives.
  • the drill bit carrier is designed as a shaft. The drill bit has the largest possible contact surface between the shaft and folding wing for impact energy transmission.
  • the folding wing can be moved back into the outer casing without any particular resistance and without twisting the drill bit in the opposite direction of rotation.
  • the torque can in particular be caused by an interaction between the folding wing and the drilling object, in particular via frictional forces on the drilling object. If the drill bit is stationary, no torque acts on the folding wing, and the folding wing can be moved back into the outer casing without any particular resistance and without twisting the drill bit in the opposite direction of rotation.
  • the percussion drill bit In a boom extension or after completion of the bore, the percussion drill bit can be withdrawn without rotation against the working direction through the casing, since the folding cutting elements assume a smaller diameter than the inner diameter of the outer casing.
  • the folding wing can, for example, with bolts transversely to Bohrkronenangol Kunststoffsachse, be rotatably or pivotally mounted in Bohrkronenitati. It is preferable if, in the first position, the radial distance of the highest point of the folding wing from the pivot axis has a positive value, since then a secure unfolding of the folding wing is ensured.
  • Each of the folding wings is formed in the manner of a circle segment, for example as a semicircular segment.
  • a rounded outer contour is favorable for a movement in a piping.
  • a rounded outer contour for initiating a movement of the flap is transverse to Bohrkronenoughl Kunststoffsachse for changing the Bohrradius advantageous.
  • the end face is inclined in the first position against the Bohrkronenabol Kunststoffsachse by a first angle, wherein the end face drops from outside to inside.
  • a bevelled edge is formed on an outer region of the folding wing.
  • On this beveled edge cutting elements are arranged, for example in the form of carbide pins. It is favorable if the angle by which the end face can be inclined has a value between 17 ° and 10 °, preferably 15 °.
  • the angle of the folding leaf in the folded state can vary between 10 ° and 15 °, as this depends on the wall thickness of the casing. For the values common manufacturing tolerances apply in the production of the folding wing.
  • the folding wing a region on its opposite side of the end face which, in the second position, is inclined at a second angle to the drill bit carrier longitudinal axis, the region falling from outside to inside.
  • this area serves as a sliding surface when the drill head is to be withdrawn into a casing. The tilt assists in sliding the flap back from the second position to its first position within the diameter of the collar.
  • the angle can have a value between 20 ° and 10 °, preferably between 18 ° and 12 °, particularly preferably 15 °. For the values common manufacturing tolerances apply in the production of the folding wing.
  • the folding wings have in the unfolded state to the free end of the drill bit a curvature inwards, which is for the directional accuracy during drilling beneficial.
  • a bevelled edge can be provided on the folding wing radially outward on the end face, which forms an outer bore diameter in the second position.
  • the beveled edge may be equipped with cutting elements, such as cemented carbide pins. This makes it possible to work even at the outermost diameter drill with a large number of cutting elements, resulting in a good drilling performance.
  • the folding wing is in its second position, the beveled edge is at a favorable angle to Bohrkronen agolijnsachse and preferably forms the outermost bore diameter of the drill collar.
  • two folding wings are provided opposite each other with respect to the drill bit carrier longitudinal axis. These can be identical.
  • the folding wing is indoors arranged eccentrically a nose adjacent to a recess, so that the lugs of the two opposing folding wings can engage in the first position in the opposite recess. This allows a compact arrangement of the folding wings in the first position and a large work surface in the second position.
  • Two folding wings result in a very stable construction.
  • At least one rinsing liquid supply can be provided within the drill bit carrier.
  • the pressure of the flushing liquid may assist the movement of the hinged wing or wings from the first to the second position.
  • the rinsing fluid can keep the mechanics of the drill bit clean and flush away cuttings.
  • a drilling dust outlet can be provided on the drill bit carrier, e.g. in the form of one or more flats on the outer circumference.
  • a drilling device with a drill bit as described above is proposed, which is guided or feasible in a Bohrkronenitati.
  • the Bohrkronenitati can be rotatably coupled to an output shaft or coupled.
  • the drill bit can be driven in rotation and / or hammering.
  • the drill bit can open to full bore diameter when guided by a drill string through tubing that is in the ground to support a drill wall. This can advantageously be continued drilling ahead of the piping.
  • the invention according to another aspect comprises an opening rotary percussion drill, which inevitably opens after passing through an outer casing at basic contact and drills larger than the diameter of the outer casing measures whose movable parts are rotatably mounted transversely to the crown shaft and form a drill head and the Drilling energy is supplied by hydraulic hammers or Imlochhoter supplied and can be easily withdrawn into the outer tube for linkage change or after completion of work without twisting against the working direction of rotation.
  • area information always includes all - not mentioned - intermediate values and all imaginable subintervals.
  • FIGS. 1 to 3 show in a partially cutaway view a drilling device 100 with a drill bit 10 according to an embodiment of the invention in a first position ( FIG. 1 ), a second position ( FIG. 2 ) and in exploded view ( FIG. 3 ).
  • the drilling device 100 further includes a drive train, not shown.
  • the drill bit 10 for overburden drilling is guided in a tube 60, which is shown partially cut open.
  • the drill bit 10 comprises a drill head 30 and a drill bit carrier 20 carrying the drill head 30 with a drill bit carrier longitudinal axis 70.
  • the drill bit carrier 20 has a coupling piece 80 at its end opposite the drill bit 30, with which the drill bit carrier 20 is connected to a drive for rotating and / or beating Driving the drill head 30 can be coupled (not shown).
  • a rinsing liquid line not shown, is arranged in the interior of the Bohrkronenlies 20 a rinsing liquid line, not shown, is arranged.
  • On the outer circumference of the Bohrkronenarris 20 a flattening can be seen, which forms a Bohrmehlablauf 90.
  • another such flattening is provided diametrically opposite as Bohrmehlablauf 90.
  • the drill head 30 comprises two folding wings 32, 34, which are arranged transversely to the Bohrkronenabolticiansachse 70 pivotally mounted on the Bohrkronenafter 20 and, relative to the Bohrkronenafterlticiansachse 70, opposite.
  • Each folding wing 32, 34 is formed on its folding wing head 35 of a segment of a circle and has an end face 40 which is bent at its outer edge.
  • the radially outwardly disposed on the end face 40 beveled edge 38 forms in the second position has an outer bore diameter of the drill bit 10.
  • the end face 40 points in the working direction (to the right in FIGS. 1-3).
  • cutting elements 50 are used, for example in the form of hard metal pins, which are embedded in corresponding holes in the respective surfaces.
  • the cutting elements 50 on the end face 40 and on the bevelled edge 38 may be configured differently.
  • the two folding wings 32, 34 are folded inwards and within the diameter of the tube 60 and thus of the drill bit diameter d10 (FIG. FIG. 6, FIG. 7 ) arranged.
  • the folding wings 32, 34 are designed so that they can partially interlock.
  • a recess 44 is provided in the interior region of each folding wing 32, 34, which can receive a nose 42 of the respectively opposite folding wing 34, 32.
  • the folding wings 32, 34 are folded outwards and protrude beyond the diameter of the tube 60 or the drill bit diameter d10 (FIG. FIG. 8, FIG. 9 ).
  • the end face 40 is inclined sloping inwardly against the drill bit carrier longitudinal axis 70 by a small angle. Due to their structural design, in particular their bevels, the folding wings 32, 34 passive, ie without separate drive, are moved from the first position to the second position. When the folding wings 32, 34 are in operative connection with a drilling object, such as rock at the borehole bottom, with rotating drill head 30, a torque is generated at the folding wing 32, 34 generated transversely to Bohrkronenlylijnsachse 70 and the folding wings 32, 34 driven from the first to the second position.
  • a drilling object such as rock at the borehole bottom
  • the flattening process 90 forming flattening is arranged parallel to the intended folding movement plane of the folding wings 32, 34.
  • FIGS. 4 and 5 show a single folding wing 32, 34 as a side view ( FIG. 4 ) and in plan view ( FIG. 5 ). Cutting elements on the folding wings 32, 34 are not shown.
  • the folding wing 32, 34 is designed as a rocker arm with a bore 46 on a foot part 48, with which the folding wings 32, 34 in the drill bit carrier 20 (FIGS. Figures 1-3 ) is pivotally mounted about a pivot axis.
  • a pivot axis may be formed by a bolt 12 and is in the FIGS. 10 and 11 shown.
  • Subsequent to the foot part 48 of the massive folding wing head 35 of the folding wing 32, 34 is formed, which in plan view ( FIG. 5 ) is formed as a circle segment.
  • a lug 42 Radially inwardly from the beveled edge 38 of the folding wing head 35 extends a lug 42 which is disposed over the foot portion 48.
  • a recess 44 is formed, which can receive a nose of an opposite folding wing ( FIG. 1 ).
  • Nose 42 and recess 44 are arranged eccentrically to the center of an imaginary circumferential circle of the circular segment-shaped folding wing 32, 34.
  • a chamfered region 36 Arranged on the underside of the folding wing 32, 34 is a chamfered region 36 which, together with the region 37, forms a contact surface of the folding wing 32, 34 in the drill bit carrier, in order to enable effective force or impact transmission to the drill bit during operation.
  • FIGS. 6 and 7 show a simplified drill bit 10 with two folding wings 32, 34 in the first position in one lateral sectional view through the drill bit 10 (FIG. FIG. 6 ) and in plan view of the drill bit 10 ( FIG. 7 ).
  • the drill bit 10 is arranged in the folded state (first position) within the tube 60.
  • the inner diameter of the tube 60 is slightly larger than the Bohrkranz tomesser d10.
  • the foot part 48 of the left-side folding wing 32 protrudes below the right-side folding wing 34 and vice versa, for clarity, for example, only the one foot 48 is numbered by a reference numeral.
  • a bore can be seen in the bevelled edge 38 which is intended to receive a cutting element in the form of a hard metal pin 50.
  • a cutting element in the form of a hard metal pin 50.
  • the radially inner edge of the chamfered edge 38 forms the most projecting edge of the drill head 30.
  • the chamfered edge 38 is provided with cutting elements 50, they protrude farthest in the working direction (in FIG. 6 up).
  • the end face 40 is inclined in the first position against the Bohrkronenoughl Kunststoffsachse 70 by an angle ⁇ , wherein the end face 40 drops from outside to inside.
  • the angle ⁇ has a value between 15 ° and 9 °, preferably between 13 ° and 11 °, particularly preferably 12 °.
  • a radially outwardly disposed portion 36 on the underside of the flaps 32, 34 also has an incline relative to the drill bit carrier longitudinal axis 70, which facilitates retraction of the flaps 32, 34 from the second position to the first position. Together with the region 37, the region 36 forms a contact surface of the folding wing 32, 34 in the drill bit carrier in order to allow an effective force or impact transfer to the drill bit during operation.
  • FIGS. 8 and 9 show the simplified drill bit 10 with two folding wings 32, 34 in the second position in a lateral sectional view through the drill bit 10 (FIG. FIG. 8 ) and in plan view of the drill bit 10 ( FIG. 9 ).
  • the end faces 40 of the folding wings 32, 34 are now positioned in the second position perpendicular to the Bohrkronenabol Kunststoffsachse 70, so that a large work surface is formed.
  • the cutting elements 50 on the chamfered edge 38 form an outer Bohrradius of the drill head 30.
  • the folding wings 32, 34 with their end faces 40 to the free end of the drill bit 30 have a curvature inward, which is for the directional accuracy of drilling advantage.
  • the folding wings 32, 34 each have a portion 36 on the end faces 40 opposite lower sides, which is inclined in the second position by an angle ⁇ against the Bohrkronenlylcertainse 70, wherein the portion 36 falls from outside to inside, ie in the same direction relative to the Bohrkronenitatilcertainsachse 70 is inclined as the respective end face 40 in the first position.
  • the angle ⁇ has a value between 20 ° and 10 °, preferably between 18 ° and 12 °, particularly preferably 15 °. With such a slope in the region 36, the folding wings 32, 34 at a standstill Drill ring 10 are easily withdrawn into the tube 60 by the areas 36 slide on the end edges of the tube 60.
  • FIGS. 10 and 11 is a folding wing 32 in a first, folded position ( FIG. 11 ) and a second, unfolded position ( FIG. 10 ), on which the operation of the drill bit is further explained.
  • the Bohrkronenlie 20 is shown cut.
  • the folding wing head 35 is pivotable about the pivot axis formed by the center of the axis of rotation of a bolt 12.
  • Reference numeral 130 denotes in the view the highest point of the folding wing 32, which lies at the edge between the end face 40 and the chamfered edge 38.
  • Reference numeral 120 denotes a point on the edge between the chamfered edge 38, while reference numeral 140 denotes a point on the edge between the region 36 and the lateral surface of the folding wing head 35.
  • the points 120, 130, 140 lie in the same imaginary plane.
  • Reference character Y denotes the radial distance of the highest point 130 from the center of the axis of rotation of the bolt 12 in the first, folded-in position.
  • Reference numeral Z denotes the radial distance of this point 130 from the center of the axis of rotation of the bolt 12 in the second, unfolded position.
  • Reference character C denotes the outer circumference of the drill bit carrier 20.
  • X denotes the axial distance between the rotational axis of the pin 12 and the axial end of the drill bit carrier 20.
  • the folding wing 32 securely moves into the second position, ie in the drilling position, in which the points 120 to 140 outside of the Bohrkronenarris 20 (FIGS. and thus the line C in the FIG. 10 ) lie. This applies regardless of the head shape of the folding wing head 35th
  • the bolt position is preferably always designed so that the folding wings 32, 34 safely unfolds and forms the largest possible contact surface on the drill bit carrier 20 for impact transmission.

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Claims (10)

  1. Couronne de foreuse rotative à percussion, qui s'ouvre après avoir parcouru un tubage extérieur lors du contact avec le sol, se déploie par force et fore plus largement que le diamètre du tubage extérieur, dans laquelle
    - les parties mobiles de la couronne de foreuse rotative à percussion sont supportées de façon rotative transversalement à l'arbre de la couronne,
    - forment une tête de forage,
    - la couronne de foreuse rotative à percussion reçoit l'énergie nécessaire pour le forage fournie par des marteaux hydrauliques ou des marteaux fond de trou,
    - la couronne de foreuse rotative à percussion peut être retirée simplement dans le tube extérieur pour le changement de tiges ou lorsque le travail est accompli sans tourner en sens contraire du sens de rotation de travail,
    - les parties mobiles comprennent au moins deux ailes rabattables (32, 34),
    caractérisée en ce que
    - chacune des ailes rabattables (32, 34) comprend une tête d'aile rabattable (35) réalisée en forme de segment de cercle, dans laquelle chaque aile rabattable (32, 34)
    - présente une face frontale (40) avec un bord biseauté disposé radialement à l'intérieur (38) et un ergot (42) s'étendant radialement vers l'intérieur à partir du bord biseauté (38), dans laquelle un évidement (44) est formé à côté de l'ergot (42) et peut contenir l'ergot (42) de l'aile rabattable opposée (32; 34), dans laquelle
    - des éléments de coupe (50) sont montés sur la face frontale (40) et sur le bord biseauté (38).
  2. Couronne de forage (10), avec une tête de forage (30) et un support de couronne de forage (20) portant la tête de forage (30), avec au moins deux ailes rabattables (32, 34), qui sont déplaçables réciproquement dans une première position et une deuxième position, dans laquelle chacune des ailes rabattables (32, 34) dans la première position est disposée à l'intérieur d'un diamètre de couronne de forage (d10) et dans la deuxième position dépasse le diamètre de la couronne de forage (d10), et dans laquelle chacune des ailes rabattables (32, 34) présente une face frontale (40) à son extrémité libre, chacune des ailes rabattables (32, 34) est disposée sur le support de couronne de forage (20) d'une façon pivotante transversalement à un axe longitudinal du support de couronne de forage (70) autour d'un axe de pivotement réalisé sous forme de pivot (12, 14) et est configurée par construction de telle manière que, lorsque la tête de forage (30) tourne, une liaison active avec un objet de forage produise un couple agissant sur l'aile rabattable (32, 34) transversalement à l'axe longitudinal du support de couronne de forage (70) et entraîne l'aile rabattable (32, 34) de la première position à la deuxième position,
    caractérisée en ce que
    - chacune des ailes rabattables (32, 34) est réalisée à sa tête d'aile rabattable (35) en forme de segment de cercle et
    - présente une face frontale (40) avec un bord biseauté (38) disposé radialement à l'extérieur et un ergot (42) s'étendant radialement vers l'intérieur à partir du bord biseauté (38), dans laquelle un évidement (44) est formé à côté de l'ergot (42) et peut contenir l'ergot (42) de l'aile rabattable opposée (32; 34), et
    - dans laquelle des éléments de coupe (50) sont montés sur la face frontale (40) et sur le bord biseauté (38).
  3. Couronne de forage selon la revendication 2, caractérisée en ce que la face frontale (40) dans la première position est inclinée d'un angle (α) par rapport à l'axe longitudinal du support de couronne de forage (70), dans laquelle la face frontale (40) descend de l'extérieur vers l'intérieur.
  4. Couronne de forage selon la revendication 2 ou 3, caractérisée en ce que dans la première position la distance radiale (Y) du point le plus haut (130) de chaque aile rabattable (32, 34) à l'axe de pivotement présente une valeur positive.
  5. Couronne de forage selon l'une quelconque des revendications précédentes, caractérisée en ce que chacune des ailes rabattables (32, 34) présente sur son côté inférieur opposé à la face frontale (40) une région (36), qui dans la deuxième position est inclinée d'un angle (β) par rapport à l'axe longitudinal du support de couronne de forage (70), dans laquelle la région (36) descend de l'extérieur vers l'intérieur.
  6. Couronne de forage selon la revendication 5, caractérisée en ce que l'angle (β) présente une valeur comprise entre 20° et 10°.
  7. Couronne de forage selon l'une quelconque des revendications précédentes, caractérisée en ce que le bord biseauté (38) forme dans la deuxième position un diamètre de forage extérieur.
  8. Couronne de forage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins une arrivée d'agent de balayage à l'intérieur du support de couronne de forage (20).
  9. Dispositif de forage (100) avec une couronne de forage (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la couronne de forage (10) est ou peut être guidée dans un tube (60).
  10. Dispositif de forage selon la revendication 9, caractérisé en ce que le support de couronne de forage est ou peut être couplé de façon calée en rotation à un arbre de sortie (80).
EP15161307.2A 2014-03-31 2015-03-27 Couronne de foreuse rotative à percussion ouvrant, en particulier pour le forage de morts-terrains Not-in-force EP2927417B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014104516.5A DE102014104516A1 (de) 2014-03-31 2014-03-31 Bohrkrone, insbesondere zum Überlagerungsbohren, sowie Bohrvorrichtung mit einer Bohrkrone

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EP2927417A2 EP2927417A2 (fr) 2015-10-07
EP2927417A3 EP2927417A3 (fr) 2016-04-27
EP2927417B1 true EP2927417B1 (fr) 2018-11-14

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Publication number Priority date Publication date Assignee Title
CN109654138A (zh) * 2019-01-14 2019-04-19 陶德明 桩孔内中空回转接头的制动装置
DE102020131532A1 (de) 2020-11-27 2022-06-02 Zipp Industries GmbH & Co.KG Bohrvorrichtung
FI130984B1 (fi) * 2022-05-03 2024-07-05 Mincon Nordic Oy Porakruunu ja menetelmä reiän poraamiseksi maahan asennettavaa putkea varten
FR3149926A1 (fr) * 2023-06-15 2024-12-20 Nge Fondations Trépan rétractable pour permettre une insertion d’un tube de forte épaisseur

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Publication number Priority date Publication date Assignee Title
US1494274A (en) * 1921-08-02 1924-05-13 James G Morgan Expansion coal cutter
US2244674A (en) * 1940-03-25 1941-06-10 Fitsum Mining Company Expanding drill
AT354960B (de) * 1978-04-06 1980-02-11 Panzer Ferdinand Bohrkrone fuer die herstellung von bohrungen in erdreich oder gestein
DE4211048C1 (fr) 1992-04-02 1993-05-06 Boart Hwf Gmbh & Co Kg Hartmetallwerkzeugfabrik, 6419 Burghaun, De
DE29513325U1 (de) * 1995-08-19 1995-10-19 Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik, 36151 Burghaun Bohrkrone
GB0009834D0 (en) 2000-04-25 2000-06-07 Brit Bit Limited Expandable bit
DE102010015474B4 (de) * 2010-04-16 2015-12-10 Stds-Jantz Gmbh & Co. Kg Bohrkopf

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Title
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EP2927417A3 (fr) 2016-04-27
EP2927417A2 (fr) 2015-10-07

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