EP3336301B1 - Drilling apparatus and method for producing a borehole - Google Patents

Drilling apparatus and method for producing a borehole Download PDF

Info

Publication number
EP3336301B1
EP3336301B1 EP16205044.7A EP16205044A EP3336301B1 EP 3336301 B1 EP3336301 B1 EP 3336301B1 EP 16205044 A EP16205044 A EP 16205044A EP 3336301 B1 EP3336301 B1 EP 3336301B1
Authority
EP
European Patent Office
Prior art keywords
drilling tool
rotary drilling
hammer
base body
pumping device
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.)
Active
Application number
EP16205044.7A
Other languages
German (de)
French (fr)
Other versions
EP3336301A1 (en
Inventor
Sebastian Bauer
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.)
Bauer Maschinen GmbH
Original Assignee
Bauer Maschinen 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
Application filed by Bauer Maschinen GmbH filed Critical Bauer Maschinen GmbH
Priority to EP16205044.7A priority Critical patent/EP3336301B1/en
Priority to CN201780078760.6A priority patent/CN110062834B/en
Priority to PCT/EP2017/080474 priority patent/WO2018114230A1/en
Priority to US16/469,275 priority patent/US10934779B2/en
Priority to KR1020197016971A priority patent/KR102328874B1/en
Publication of EP3336301A1 publication Critical patent/EP3336301A1/en
Application granted granted Critical
Publication of EP3336301B1 publication Critical patent/EP3336301B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • E21B6/00—Drives for drilling with combined rotary and percussive action
    • E21B6/02—Drives for drilling with combined rotary and percussive action the rotation being continuous
    • E21B6/04—Separate drives for percussion and rotation
    • 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
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers
    • 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
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • 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
    • E21B10/02—Core 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
    • E21B6/00—Drives for drilling with combined rotary and percussive action

Definitions

  • the invention relates to a rotary drilling tool for creating a hole in the ground, with a base body, a removal device arranged on an underside of the base body, which has at least one hammer unit which comprises an axially reversibly driven hammer element, and a discharge line for discharging removed soil material and drilling suspension, according to the preamble of claim 1.
  • the invention further relates to a method for creating a hole in the ground with a rotary drilling tool, in which soil material is removed with a removal device on an underside of a base body of the rotary drilling tool and removed soil material and drilling suspension are removed by means of a discharge line, the removal device having at least one hammer unit, in which a hammer element is driven axially reversing, according to the preamble of claim 12.
  • a generic rotary drilling tool comes from the EP 2 592 214 A1 out.
  • several hammer units are provided with axially reversible hammer elements which are driven by compressed air. This creates a striking movement of the hammer elements, which means that hard ground, especially rock, can be removed.
  • Used compressed air can escape from a lower area of the hammer units, the compressed air being used to remove removed soil material and drilling suspension in the so-called air-lifting process.
  • the released compressed air can flow upwards through discharge lines. Soil material and drilling suspension are removed upwards from the borehole.
  • a drilling device which can be arranged within a support pipe and can clamp on the inside of the drill pipe to create the hole.
  • a rotary drive, a feed drive, a clamping device for clamping the housing in the support tube and other units for feeding and discharging suspensions are arranged within the drilling device. The soil material is removed using rotating cutting devices.
  • Drilling tools with rotating cutting teeth are suitable for working on soils of low or medium strength, particularly stripping soil material.
  • the WO 83/00183 teaches a hammer drill with a single drill head located at a lower end of the drilling device.
  • the US 4,790,391 A shows another rotary drilling device with an alternative cutting element advance.
  • a propulsive force is generated on the cutting element using a pneumatic piston.
  • the cutting element is axially displaceable on a guide, for example in the form of a splined shaft profile, which is acted upon by the piston.
  • a pumping device is provided on the working surface, which sucks the drilling suspension from the depth of the borehole.
  • the invention is based on the object of specifying a rotary drilling tool and a method for creating a hole in the ground, with which particularly good removal performance can be achieved, especially with hard ground material.
  • the object is achieved on the one hand by a rotary drilling tool with the features of claim 1 and on the other hand by a method with the features of claim 12.
  • Preferred embodiment variants are specified in the respective dependent claims.
  • the rotary drilling tool according to the invention is characterized in that a pumping device is arranged on the base body along the discharge line and that the pumping device is designed to pump out the removed soil material with drilling suspension through the discharge line.
  • a basic idea of the invention is based on the knowledge that, for good removal performance in hammer units with reversibly driven hammer elements, it is essential that these hammer elements hit the hard ground material as directly as possible. This allows the impact energy to be efficiently converted into selective overloads on the ground material which leads to the existing floor material flaking or breaking off.
  • the hammer unit can be driven in any way, for example using electrical energy or using a hydraulic fluid.
  • the at least one hammer unit is operated with compressed air, which is supplied via a supply line.
  • the compressed air is supplied from outside the borehole by a compressor, which is preferably arranged on the drilling device, through which a rotary movement is also applied to the rotary drilling tool.
  • a preferred development of the invention is that an outlet opening for used compressed air is provided at a lower end region of the at least one hammer unit.
  • the used compressed air therefore also escapes into the area in which the soil removal takes place.
  • the compressed air can flow upwards in the borehole filled with drilling suspension to remove removed soil material. According to the air-lifting process, the compressed air flowing upwards carries with it a certain amount of removed soil material and drilling suspension. This allows the flow generated by the pump device to be supported.
  • any suitable pump can be used as the pump device, in particular a screw pump.
  • One or more pumps can be provided.
  • a further preferred embodiment of the invention is that the hammer element has a vertically aligned piston, which is slidably mounted in a cylinder housing of the hammer unit.
  • the rotary drilling tool can have several hammer units which are designed in the same way.
  • the hammer units can in particular be designed in modular form from the cylinder housing with the piston mounted therein. The supply and discharge of compressed air is controlled in such a way that the piston moves up and down at a desired frequency.
  • the hammer units are arranged in a substantially cylindrical housing of the rotary drilling tool.
  • the pump device is arranged in a housing above the removal device.
  • the housing can extend a cylindrical base body with the removal device upwards.
  • the pump device is preferably arranged centrally within the upper part of the housing.
  • Energy for operating the pumping device can be supplied from outside the borehole via an energy supply line, in particular an electrical line or a pressurized fluid line.
  • a so-called rotary feedthrough or a rotary contact with an annular contact strip can be provided in a generally known manner, so that energy can be transferred to the rotating drilling tool from a fixed energy supply from the outside.
  • a connecting device for a drill pipe is arranged on an upper side of the housing.
  • the connecting device can in particular be a so-called Kelly box for connecting a Kelly drill pipe.
  • Other mechanical connecting devices for non-rotatably connecting the rotary drilling tool to a drill pipe can also be used.
  • a particularly efficient suction of removed soil material is achieved in that the pumping device is arranged on a central section of the discharge line and that the discharge line is divided into several discharge lines below the central section.
  • the pumping device is therefore arranged centrally on an approximately central section of the discharge line, whereby the suction power of the pump can be divided into several discharge lines below the central section.
  • At least one suction opening for sucking off the removed soil material is arranged on an underside of the base body.
  • Each suction opening is connected to a discharge sub-line, which leads to the central section with the pump device.
  • the processed soil material can be particularly reliably extracted over the entire drilling section and removed upwards via several suction openings.
  • a possible embodiment of the rotary drilling tool according to the invention is that the rotary drilling tool is designed as a full-cut drilling tool.
  • the downward-facing end face of the rotary drilling tool is essentially plate-shaped, with several hammer elements protruding to remove the existing soil. When the rotary drilling tool is rotated at the same time, particularly large areas of soil can be worked.
  • the rotary drilling tool is designed as a core drilling tool.
  • the hammer units are located as a removal device along an annular edge region of the base body.
  • a free receiving space remains in the middle to accommodate a core that forms during drilling.
  • the drill core can break off on its own after a certain length due to the transverse forces that occur during drilling.
  • an active device for breaking or processing the drill core can also be provided.
  • the core can be removed from the borehole using the rotary drilling tool or a separate core catcher.
  • an energy supply line is provided with which the pump device on the base body is supplied with energy, in particular electrical or hydraulic energy.
  • energy in particular electrical or hydraulic energy.
  • the pumping device can be operated particularly reliably.
  • the pump performance can also be easily adjusted possible depending on your needs.
  • the pumping device can also be done by tapping torque from the drill pipe.
  • the method according to the invention is characterized in that a pump device is arranged on a base body of the rotary drilling tool along the discharge line, with which the removed soil material with drilling suspension is pumped out through the discharge line to the outside of a borehole.
  • the method according to the invention is preferably carried out with the rotary drilling tool according to the invention, as described above.
  • the advantages described above can be achieved, particularly with regard to a high removal rate.
  • a preferred variant of the method according to the invention is that the hammer unit is operated with compressed air, which exits from an underside of the base body.
  • the escaping compressed air can support the removal of removed soil material with drilling suspension upwards into the discharge line.
  • particularly reliable suction is achieved in that the removed soil material and the drilling suspension are sucked out via several suction openings and several suction lines, which open into a central section on which the pumping device is arranged.
  • the pump's suction power is distributed over several partial suction lines and several drainage openings. This promotes reliable and quick removal of the removed soil material.
  • a first rotary drilling tool 10 is described below in connection with Figures 1 to 3 explained.
  • the rotary drilling tool 10 is designed as a core drilling tool with an annular arrangement of the removal device 20 around a central hollow core receptacle 16.
  • the removal device 20 has six identically designed hammer units 22 with a circular disk-shaped hammer element 24.
  • removal elements (not shown) are arranged, which are preferably tapered hard metal elements.
  • Suction openings 38 are arranged between the individual hammer units 22 for suctioning off the removed soil material with the surrounding drilling suspension.
  • the suction openings 38 are set obliquely in one direction of rotation in order to achieve the best possible material absorption.
  • the rotary drilling tool 10 has a cylindrical housing 14, at the upper end of which a connecting device 50 for a drill pipe is attached.
  • the connecting device 50 is preferably designed as a so-called Kelly box for receiving a square of a drill pipe.
  • the individual hammer units 22 have an elongated cylindrical cylinder housing 28, in which a piston 26 is mounted so that it can be moved reversibly between a lower impact position and an upper retraction position.
  • the disk-shaped hammer element 24 is attached.
  • the hammer units 22 are supplied with compressed air via a supply line 29.
  • the transverse line 27 is formed between two cover plates. At a lower end region of the hammer units 22, used compressed air can exit on the underside of the base body 12 of the rotary drilling tool 10.
  • Removed soil material and surrounding drilling suspension as well as escaping compressed air are removed via the obliquely directed suction openings 38 via the individual partial discharge lines 34.
  • the partial discharge lines 34 are connected via transverse channels 35 to a central section 32 of an upwardly guided discharge line 30.
  • a pump device 40 arranged centrally in the housing 14 is positioned on the central section 32.
  • the pump device 40 is supplied with drive energy, in particular electrical energy, from a carrier device outside the borehole via an energy supply line 44. From the central section 32, the sucked-in soil material is conveyed upwards via the discharge line 30 via the pump device 40.
  • the pump device 40 is firmly connected to the base body 12 of the rotary drilling tool 10 via a pump housing 42 and the central section 32.
  • a second rotary drilling tool 10 which is designed as a full-cut drilling tool.
  • the rotary drilling tool 10 has a cylindrical housing 14, at the lower end of which a removal device 20 is arranged, which extends essentially transversely over a circular disk-shaped base plate 18.
  • the removal device 20 is formed from a plurality of hammer units 22 with circular disk-shaped hammer elements 24.
  • two radially extending slot-shaped suction openings 38 for suctioning off removed soil material and surrounding soil suspension are arranged on the base plate 18.
  • a Kelly box is attached as a connecting device 50 for a drill pipe.
  • the rod-shaped hammer units 22 with their respective cylinder housings 28 are arranged within the cylindrical housing 14, which represents an essential part of the base body 12 in this rotary drilling tool 10.
  • pistons 26 driven by compressed air are mounted in an axially reversible manner in order to exert an impact movement on the existing face.
  • disk-shaped hammer elements 24 with removal elements are attached.
  • the pump device 40 has two separate pumps 41, each pump 41 being connected to a suction opening 38 via its own discharge line 30.
  • an upwardly extending supply line 29 is provided, which opens in its lower region into a central pipe section 25, which is formed below the connecting device 50. Compressed air supplied is forwarded from the pipe section 25 to the individual hammer units 22 via a transverse line 27 formed in a cover plate 17.
  • the rotary drilling tool 10 is driven in rotation via a drill pipe (not shown), so that the removal device 20 with the hammer units 22 sweeps over the entire working face.

Landscapes

  • 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)

Description

Die Erfindung betrifft ein Drehbohrwerkzeug zum Erstellen einer Bohrung im Boden, mit einem Grundkörper, einer an einer Unterseite des Grundkörper angeordneten Abtragseinrichtung, welche mindestens eine Hammereinheit aufweist, welche ein axial reversierend angetriebenes Hammerelement umfasst, und eine Abführleitung zum Abführen von abgetragenem Bodenmaterial und Bohrsuspension, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a rotary drilling tool for creating a hole in the ground, with a base body, a removal device arranged on an underside of the base body, which has at least one hammer unit which comprises an axially reversibly driven hammer element, and a discharge line for discharging removed soil material and drilling suspension, according to the preamble of claim 1.

Die Erfindung betrifft weiterhin ein Verfahren zum Erstellen einer Bohrung im Boden mit einem Drehbohrwerkzeug, bei dem mit einer Abtragseinrichtung an einer Unterseite eines Grundkörpers des Drehbohrwerkzeugs Bodenmaterial abgetragen wird und mittels einer Abführleitung abgetragenes Bodenmaterial und Bohrsuspension abgeführt werden, wobei die Abtragseinrichtung mindestens eine Hammereinheit aufweist, bei welcher ein Hammerelement axial reversierend angetrieben wird, gemäß dem Oberbegriff des Anspruchs 12.The invention further relates to a method for creating a hole in the ground with a rotary drilling tool, in which soil material is removed with a removal device on an underside of a base body of the rotary drilling tool and removed soil material and drilling suspension are removed by means of a discharge line, the removal device having at least one hammer unit, in which a hammer element is driven axially reversing, according to the preamble of claim 12.

Ein gattungsgemäßes Drehbohrwerkzeug geht aus der EP 2 592 214 A1 hervor. Bei diesem Drehbohrwerkzeug sind mehrere Hammereinheiten mit axial reversierend bewegbaren Hammerelementen vorgesehen, welche mittels Druckluft angetrieben werden. Hierdurch wird eine Schlagbewegung der Hammerelemente erzeugt, wodurch harter Boden, insbesondere Gestein, abgetragen werden kann. Verbrauchte Druckluft kann dabei an einem unteren Bereich der Hammereinheiten austreten, wobei die Druckluft zum Abfördern von abgetragenem Bodenmaterial und Bohrsuspension im sogenannten Luft-Hebe-Verfahren dient. Dabei kann die freigesetzte Druckluft durch Abführleitungen nach oben strömen. Bodenmaterial und Bohrsuspension werden mit nach oben aus dem Bohrloch abgeführt.A generic rotary drilling tool comes from the EP 2 592 214 A1 out. In this rotary drilling tool, several hammer units are provided with axially reversible hammer elements which are driven by compressed air. This creates a striking movement of the hammer elements, which means that hard ground, especially rock, can be removed. Used compressed air can escape from a lower area of the hammer units, the compressed air being used to remove removed soil material and drilling suspension in the so-called air-lifting process. The released compressed air can flow upwards through discharge lines. Soil material and drilling suspension are removed upwards from the borehole.

Aus der EP 2 703 596 B1 ist eine Bohrvorrichtung bekannt, welche innerhalb eines Stützrohres angeordnet werden kann und sich an der Innenseite des Bohrrohres zum Erstellen der Bohrung festklemmen kann. Innerhalb der Bohrvorrichtung sind ein Drehantrieb, ein Vorschubantrieb, eine Klemmeinrichtung zum Festklemmen des Gehäuses in dem Stützrohr sowie weitere Aggregate zum Zuführen und Abführen von Suspensionen angeordnet. Das Abtragen des Bodenmaterials erfolgt über rotierende Schneideinrichtungen.From the EP 2 703 596 B1 a drilling device is known which can be arranged within a support pipe and can clamp on the inside of the drill pipe to create the hole. A rotary drive, a feed drive, a clamping device for clamping the housing in the support tube and other units for feeding and discharging suspensions are arranged within the drilling device. The soil material is removed using rotating cutting devices.

Bohrwerkzeuge mit rotierenden Schneidzähnen sind zum Bearbeiten von Böden mit geringer oder mittlerer Festigkeit geeignet, wobei Bodenmaterial insbesondere abgeschält wird. Zum Bearbeiten von Böden hoher Festigkeit, insbesondere von anstehenden Gestein und Felsen ist ein Bearbeiten durch Rollenmeißel oder aktiv angetriebener Hammereinheiten notwendig. Diese üben auf hartem spröden Material eine punktuelle hohe Druckbelastung aus, welche zu einem Abplatzen und damit einem Abtragen von Bodenmaterial führt.Drilling tools with rotating cutting teeth are suitable for working on soils of low or medium strength, particularly stripping soil material. To work on high-strength soils, especially on rocks and rocks, it is necessary to work with roller chisels or actively driven hammer units. These exert a high point pressure load on hard, brittle material, which leads to spalling and thus removal of soil material.

Aus der EP 2 597 249 A1 geht ein Bohrgerät sowie ein Verfahren zum Erstellen einer vertikalen Bohrung hervor. An einem unteren Ende ist hierfür an einer Bohrvorrichtung ein exzentrisch angeordneter, rotierender Bohrkopf vorgesehen.From the EP 2 597 249 A1 describes a drilling device and a method for creating a vertical hole. For this purpose, an eccentrically arranged, rotating drill head is provided at a lower end of a drilling device.

Die WO 83/00183 lehrt einen Bohrhammer mit einem einzelnen Bohrkopf, welcher an einem unteren Ende der Bohrvorrichtung angeordnet ist.The WO 83/00183 teaches a hammer drill with a single drill head located at a lower end of the drilling device.

Die US 4 790 391 A zeigt eine weitere Drehbohrvorrichtung mit einem alternativen Schneidelementvortrieb. Hierbei wird mittels eines pneumatischen Kolbens auf das Schneidelement eine Vortriebskraft erzeugt. Das Schneidelement ist axial verschieblich auf einer Führung, z.B. in Form eines Keilwellenprofils, gelagert, welche durch den Kolben beaufschlagt wird. Eine Pumpvorrichtung ist an der Arbeitsoberfläche vorgesehen, die die Bohrsuspension aus der Tiefe des Bohrlochs ansaugt.The US 4,790,391 A shows another rotary drilling device with an alternative cutting element advance. Here, a propulsive force is generated on the cutting element using a pneumatic piston. The cutting element is axially displaceable on a guide, for example in the form of a splined shaft profile, which is acted upon by the piston. A pumping device is provided on the working surface, which sucks the drilling suspension from the depth of the borehole.

Der Erfindung liegt die Aufgabe zugrunde, ein Drehbohrwerkzeug und ein Verfahren zum Erstellen einer Bohrung im Boden anzugeben, mit welchem insbesondere bei einem harten Bodenmaterial eine besonders gute Abtragsleistung erzielbar ist.The invention is based on the object of specifying a rotary drilling tool and a method for creating a hole in the ground, with which particularly good removal performance can be achieved, especially with hard ground material.

Die Aufgabe wird nach der Erfindung zum einen durch ein Drehbohrwerkzeug mit den Merkmalen des Anspruchs 1 und zum anderen durch ein Verfahren mit den Merkmalen des Anspruchs 12 gelöst. Bevorzugte Ausführungsvarianten sind in den jeweils abhängigen Ansprüchen angegeben.According to the invention, the object is achieved on the one hand by a rotary drilling tool with the features of claim 1 and on the other hand by a method with the features of claim 12. Preferred embodiment variants are specified in the respective dependent claims.

Das erfindungsgemäße Drehbohrwerkzeug ist dadurch gekennzeichnet, dass an dem Grundkörper entlang der Abführleitung eine Pumpeinrichtung angeordnet ist und dass die Pumpeinrichtung zum Abpumpen des abgetragenen Bodenmaterials mit Bohrsuspension durch die Abführleitung ausgebildet ist.The rotary drilling tool according to the invention is characterized in that a pumping device is arranged on the base body along the discharge line and that the pumping device is designed to pump out the removed soil material with drilling suspension through the discharge line.

Ein Grundgedanke der Erfindung beruht auf der Erkenntnis, dass es für eine gute Abtragsleistung bei Hammereinheiten mit reversierend angetriebenen Hammerelementen von einer wesentlichen Bedeutung ist, dass diese Hammerelemente möglichst unmittelbar auf das anstehende harte Bodenmaterial treffen. Hierdurch kann die Schlagenergie effizient in punktuelle Überlastungen des Bodenmaterials umgesetzt werden, was zu einem Abplatzen oder Absprengen des anstehenden Bodenmaterials führt.A basic idea of the invention is based on the knowledge that, for good removal performance in hammer units with reversibly driven hammer elements, it is essential that these hammer elements hit the hard ground material as directly as possible. This allows the impact energy to be efficiently converted into selective overloads on the ground material which leads to the existing floor material flaking or breaking off.

Durch den Einsatz einer Pumpeinrichtung unmittelbar an der Abführleitung an dem Drehbohrwerkzeug selbst wird erreicht, dass besonders zuverlässig und schnell abgetragenes Bodenmaterial mit Bohrsuspension von der Ortsbrust abgeführt wird. Damit wird erreicht, dass beim Auftreffen der Hammerelemente auf den anstehenden Boden die Schlagenergie nicht durch noch nicht abgeführtes abgetragenes Bodenmaterial abgemildert und abgedämpft wird. Ein unmittelbares und schnelles Abführen des abgetragenen Bodenmaterials durch eine Pumpeinrichtung in dem Drehbohrwerkzeug selbst wird somit erreicht, dass ein möglichst hoher Anteil der Schlagenergie in den anstehenden Boden aufgebracht wird. Hierdurch wird eine hohe Abtragsleistung erzielt.By using a pump device directly on the discharge line on the rotary drilling tool itself, it is achieved that soil material removed with drilling suspension is removed from the face particularly reliably and quickly. This ensures that when the hammer elements hit the ground, the impact energy is not mitigated and dampened by ground material that has not yet been dissipated. An immediate and rapid removal of the removed soil material by a pump device in the rotary drilling tool itself is achieved by applying as high a proportion of the impact energy as possible to the existing soil. This achieves a high removal rate.

Grundsätzlich kann die Hammereinheit in jeder beliebigen Weise angetrieben werden, etwa mittels elektrischer Energie oder mittels eines Hydraulikfluids. Besonders vorteilshaft ist es nach einer Ausführungsform der Erfindung, dass die mindestens eine Hammereinheit mit Druckluft betrieben ist, welche über eine Zuführleitung zugeführt ist. Die Druckluft wird von außerhalb des Bohrlochs von einem Kompressor zugeleitet, welcher vorzugsweise an dem Bohrgerät angeordnet ist, durch welches auch eine Drehbewegung auf das Drehbohrwerkzeug aufgebracht wird.In principle, the hammer unit can be driven in any way, for example using electrical energy or using a hydraulic fluid. According to one embodiment of the invention, it is particularly advantageous that the at least one hammer unit is operated with compressed air, which is supplied via a supply line. The compressed air is supplied from outside the borehole by a compressor, which is preferably arranged on the drilling device, through which a rotary movement is also applied to the rotary drilling tool.

Eine bevorzugte Weiterbildung der Erfindung besteht darin, dass an einem unteren Endbereich der mindestens einen Hammereinheit eine Austrittsöffnung für verbrauchte Druckluft vorgesehen ist. Die verbrauchte Druckluft tritt somit ebenfalls in den Bereich aus, in welchem der Bodenabtrag stattfindet. Die Druckluft kann dabei in dem mit Bohrsuspension gefüllten Bohrloch zum Abführen von abgetragenem Bodenmaterial nach oben strömen. Entsprechend dem Luft-Hebe-Verfahren reißt die nach oben strömende Druckluft in gewissem Umfang abgetragenes Bodenmaterial und Bohrsuspension mit sich. Hierdurch kann die Strömung, welche von der Pumpeinrichtung erzeugt wird, unterstützt werden. Als Pumpeinrichtung kann grundsätzlich jede geeignete Pumpe eingesetzt werden, insbesondere eine Schneckenpumpe. Es können eine oder mehrere Pumpen vorgesehen sein.A preferred development of the invention is that an outlet opening for used compressed air is provided at a lower end region of the at least one hammer unit. The used compressed air therefore also escapes into the area in which the soil removal takes place. The compressed air can flow upwards in the borehole filled with drilling suspension to remove removed soil material. According to the air-lifting process, the compressed air flowing upwards carries with it a certain amount of removed soil material and drilling suspension. This allows the flow generated by the pump device to be supported. In principle, any suitable pump can be used as the pump device, in particular a screw pump. One or more pumps can be provided.

Eine weitere bevorzugte Ausführungsform der Erfindung besteht darin, dass das Hammerelement einen vertikal ausgerichteten Kolben aufweist, welcher in einem Zylindergehäuse der Hammereinheit verschiebbar gelagert ist. Das Drehbohrwerkzeug kann dabei mehrere Hammereinheiten aufweisen, welche gleich ausgebildet sind. Die Hammereinheiten können insbesondere modulartig aus dem Zylindergehäuse mit dem darin gelagerten Kolben ausgebildet sein. Dabei wird die Zuführung und Abführung von Druckluft so gesteuert, dass eine Auf- und Ab-Bewegung des Kolbens mit einer gewünschten Frequenz erreicht wird.A further preferred embodiment of the invention is that the hammer element has a vertically aligned piston, which is slidably mounted in a cylinder housing of the hammer unit. The rotary drilling tool can have several hammer units which are designed in the same way. The hammer units can in particular be designed in modular form from the cylinder housing with the piston mounted therein. The supply and discharge of compressed air is controlled in such a way that the piston moves up and down at a desired frequency.

Die Hammereinheiten sind dabei in einem im Wesentlichen zylindrischen Gehäuse des Drehbohrwerkzeuges angeordnet. Eine bevorzugte Ausführungsvariante der Erfindung kann darin gesehen werden, dass die Pumpeinrichtung oberhalb der Abtragseinrichtung in einem Gehäuse angeordnet ist. Das Gehäuse kann dabei einen zylindrischen Grundkörper mit der Abtragseinrichtung nach oben verlängern. Innerhalb des oberen Teils in dem Gehäuse ist die Pumpeinrichtung vorzugsweise mittig angeordnet. Von außerhalb des Bohrlochs kann über eine Energiezufuhrleitung, insbesondere eine elektrische Leitung oder eine Druckfluidleitung, Energie zum Betrieb der Pumpeinrichtung von außerhalb des Bohrlochs zugeführt werden.The hammer units are arranged in a substantially cylindrical housing of the rotary drilling tool. A preferred embodiment variant of the invention can be seen in that the pump device is arranged in a housing above the removal device. The housing can extend a cylindrical base body with the removal device upwards. The pump device is preferably arranged centrally within the upper part of the housing. Energy for operating the pumping device can be supplied from outside the borehole via an energy supply line, in particular an electrical line or a pressurized fluid line.

Bei einem drehenden Bohrwerkzeug kann in grundsätzlich bekannter Weise eine sogenannte Drehdurchführung oder ein Drehkontakt mit einer ringförmigen Kontaktleiste vorgesehen sein, so dass von einer feststehenden Energiezuführung von außen Energie auf das drehende Bohrwerkzeug übertragen werden kann.In the case of a rotating drilling tool, a so-called rotary feedthrough or a rotary contact with an annular contact strip can be provided in a generally known manner, so that energy can be transferred to the rotating drilling tool from a fixed energy supply from the outside.

Nach einer Weiterbildung der Erfindung ist es vorteilhaft, dass an einer Oberseite des Gehäuses eine Verbindungseinrichtung für ein Bohrgestänge angeordnet ist. Die Verbindungseinrichtung kann insbesondere eine sogenannte Kellybox zum Anschließen eines Kelly-Bohrgestänges sein. Auch andere mechanische Verbindungseinrichtungen zum drehfesten Verbinden des Drehbohrwerkzeuges mit einem Bohrgestänge können verwendet werden.According to a further development of the invention, it is advantageous that a connecting device for a drill pipe is arranged on an upper side of the housing. The connecting device can in particular be a so-called Kelly box for connecting a Kelly drill pipe. Other mechanical connecting devices for non-rotatably connecting the rotary drilling tool to a drill pipe can also be used.

Eine besonders effiziente Absaugung von abgetragenem Bodenmaterial wird nach einer Weiterbildung der Erfindung dadurch erzielt, dass die Pumpeinrichtung an einem Zentralabschnitt der Abführleitung angeordnet ist und dass sich unterhalb des Zentralabschnitts die Abführleitung in mehrere Abführleitungen aufteilt. Die Pumpeinrichtung ist somit zentral an einem etwa mittigen Abschnitt der Abführleitung angeordnet, wobei sich die Saugleistung der Pumpe auf mehrere Abführleitungen unterhalb des Zentralabschnitts aufteilen kann.According to a further development of the invention, a particularly efficient suction of removed soil material is achieved in that the pumping device is arranged on a central section of the discharge line and that the discharge line is divided into several discharge lines below the central section. The pumping device is therefore arranged centrally on an approximately central section of the discharge line, whereby the suction power of the pump can be divided into several discharge lines below the central section.

Besonders vorteilhaft ist es dabei, dass an einer Unterseite des Grundkörpers mindestens eine Ansaugöffnung zum Absaugen des abgetragenen Bodenmaterials angeordnet ist. Dabei ist jede Absaugöffnung mit einer Abführteilleitung verbunden, welche zu dem Zentralabschnitt mit der Pumpeinrichtung führt. Über mehrere Absaugöffnungen kann das abgearbeitete Bodenmaterial besonders zuverlässig über den gesamten Bohrabschnitt abgesaugt und nach oben abgeführt werden.It is particularly advantageous that at least one suction opening for sucking off the removed soil material is arranged on an underside of the base body. Each suction opening is connected to a discharge sub-line, which leads to the central section with the pump device. The processed soil material can be particularly reliably extracted over the entire drilling section and removed upwards via several suction openings.

Eine mögliche Ausführungsform des erfindungsgemäßen Drehbohrwerkzeugs besteht darin, dass das Drehbohrwerkzeug als ein Vollschnitt-Bohrwerkzeug ausgebildet ist. Dabei ist die nach unten gerichtete Stirnseite des Drehbohrwerkzeugs im Wesentlichen plattenförmig, wobei mehrere Hammerelemente zum Abtragen des anstehenden Boden vorstehen. Bei einem gleichzeitigen Drehen des Drehbohrwerzeugs kann so eine besonders großflächige Bodenbearbeitung stattfinden.A possible embodiment of the rotary drilling tool according to the invention is that the rotary drilling tool is designed as a full-cut drilling tool. The downward-facing end face of the rotary drilling tool is essentially plate-shaped, with several hammer elements protruding to remove the existing soil. When the rotary drilling tool is rotated at the same time, particularly large areas of soil can be worked.

Alternativ kann es nach einer Weiterbildung der Erfindung vorgesehen sein, dass das Drehbohrwerkzeug als ein Kernbohrwerkzeug ausgebildet ist. Dabei befinden sich die Hammereinheiten als Abtragseinrichtung entlang eines ringförmigen Randbereichs des Grundkörpers. In der Mitte verbleibt ein freier Aufnahmeraum zur Aufnahme eines sich beim Bohren bildenden Bohrkerns. Üblicherweise kann der Bohrkern aufgrund der beim Bohren auftretenden Querkräfte ab einer bestimmten Länge von sich aus abbrechen. Vorzugsweise kann auch eine aktive Einrichtung zum Brechen oder Abarbeiten des Bohrkerns vorgesehen sein. Der Bohrkern kann mit dem Drehbohrwerkzeug oder einem separaten Kernfänger aus dem Bohrloch abgeführt werden.Alternatively, according to a further development of the invention, it can be provided that the rotary drilling tool is designed as a core drilling tool. The hammer units are located as a removal device along an annular edge region of the base body. A free receiving space remains in the middle to accommodate a core that forms during drilling. Usually, the drill core can break off on its own after a certain length due to the transverse forces that occur during drilling. Preferably, an active device for breaking or processing the drill core can also be provided. The core can be removed from the borehole using the rotary drilling tool or a separate core catcher.

Weiterhin ist es nach einer Ausführungsvariante der Erfindung vorteilhaft, dass eine Energiezufuhrleitung vorgesehen ist, mit welcher die Pumpeinrichtung an dem Grundkörper mit Energie, insbesondere elektrischer oder hydraulischer Energie, versorgt ist. Mit dieser Energiezuführung kann die Pumpeinrichtung besonders zuverlässig betrieben werden. Auch ist ohne Weiteres eine Einstellung der Pumpenleistung je nach Bedarf möglich. Alternativ kann die Pumpeinrichtung auch durch Abgreifen von Drehmoment von dem Bohrgestänge erfolgen.Furthermore, according to an embodiment variant of the invention, it is advantageous that an energy supply line is provided with which the pump device on the base body is supplied with energy, in particular electrical or hydraulic energy. With this energy supply, the pumping device can be operated particularly reliably. The pump performance can also be easily adjusted possible depending on your needs. Alternatively, the pumping device can also be done by tapping torque from the drill pipe.

Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass an einem Grundkörper des Drehbohrwerkzeugs entlang der Abführleitung eine Pumpeinrichtung angeordnet ist, mit welcher das abgetragene Bodenmaterial mit Bohrsuspension durch die Abführleitung nach außerhalb eines Bohrlochs abgepumpt wird.The method according to the invention is characterized in that a pump device is arranged on a base body of the rotary drilling tool along the discharge line, with which the removed soil material with drilling suspension is pumped out through the discharge line to the outside of a borehole.

Das erfindungsgemäße Verfahren wird vorzugsweise mit dem erfindungsgemäßen Drehbohrwerkzeug ausgeführt, wie es vorausgehend beschrieben wurde. Mit dem erfindungsgemäßen Verfahren können die zuvor beschriebenen Vorteile insbesondere hinsichtlich einer hohen Abtragsleistung erzielt werden.The method according to the invention is preferably carried out with the rotary drilling tool according to the invention, as described above. With the method according to the invention, the advantages described above can be achieved, particularly with regard to a high removal rate.

Eine bevorzugte Variante des erfindungsgemäßen Verfahrens besteht darin, dass die Hammereinheit mit Druckluft betrieben wird, welche an einer Unterseite des Grundkörpers austritt. Die austretende Druckluft kann ein Abfördern von abgetragenem Bodenmaterial mit Bohrsuspension nach oben in die Abführleitung unterstützen.A preferred variant of the method according to the invention is that the hammer unit is operated with compressed air, which exits from an underside of the base body. The escaping compressed air can support the removal of removed soil material with drilling suspension upwards into the discharge line.

Ein besonders zuverlässiges Absaugen wird nach einer weiteren Verfahrensvariante der Erfindung dadurch erzielt, dass das abgetragene Bodenmaterial und die Bohrsuspension über mehrere Absaugöffnungen und mehrere Absaugleitungen abgesaugt werden, welche in einen Zentralabschnitt münden, an welchem die Pumpeinrichtung angeordnet ist. Die Absaugleistung der Pumpe wird so auf mehrere Teilabsaugleitungen und mehrere Absauföffnungen verteilt. Dies fördert ein zuverlässiges und schnelles Abführen des abgetragenen Bodenmaterials.According to a further method variant of the invention, particularly reliable suction is achieved in that the removed soil material and the drilling suspension are sucked out via several suction openings and several suction lines, which open into a central section on which the pumping device is arranged. The pump's suction power is distributed over several partial suction lines and several drainage openings. This promotes reliable and quick removal of the removed soil material.

Die Erfindung wird nachfolgend anhand von bevorzugten Ausführungsbeispielen weiter beschrieben, welche schematisch in den Zeichnungen dargestellt sind. In den Zeichnungen zeigen:

Fig. 1
eine perspektivische Ansicht eines ersten erfindungsgemäßen Drehbohrwerkzeugs;
Fig. 2
eine perspektivische Ansicht des Drehbohrwerkzeugs von Fig. 1 ohne Gehäuse;
Fig. 3
eine Schnittsansicht des Drehbohrwerkzeugs von Fig. 1 in einem Längsschnitt;
Fig. 4
eine perspektivische Ansicht eines zweiten erfindungsgemäßen Drehbohrwerkzeugs;
Fig. 5
eine perspektivische Ansicht eines Drehbohrwerkzeugs von Fig. 4 ohne Gehäuse;
Fig. 6
eine Schnittsansicht des Drehbohrwerkzeugs von Fig. 4 in einem Längsschnitt; und
Fig. 7
eine Schnittsansicht des Drehbohrwerkzeugs von Fig. 4 in einem Querschnitt quer zur Längsachse.
The invention is further described below using preferred exemplary embodiments, which are shown schematically in the drawings. In the drawings show:
Fig. 1
a perspective view of a first rotary drilling tool according to the invention;
Fig. 2
a perspective view of the rotary drilling tool from Fig. 1 without housing;
Fig. 3
a sectional view of the rotary drilling tool from Fig. 1 in a longitudinal section;
Fig. 4
a perspective view of a second rotary drilling tool according to the invention;
Fig. 5
a perspective view of a rotary drilling tool from Fig. 4 without housing;
Fig. 6
a sectional view of the rotary drilling tool from Fig. 4 in a longitudinal section; and
Fig. 7
a sectional view of the rotary drilling tool from Fig. 4 in a cross section transverse to the longitudinal axis.

Ein erstes erfindungsgemäßes Drehbohrwerkzeug 10 wird nachfolgend im Zusammenhang mit den Figuren 1 bis 3 erläutert. Das Drehbohrwerkzeug 10 ist als ein Kernbohrwerkzeug mit einer ringförmigen Anordnung der Abtragseinrichtung 20 um eine mittige hohle Kernaufnahme 16 ausgebildet. Die Abtragseinrichtung 20 weist im dargestellten Ausführungsbeispiel sechs gleich ausgebildete Hammereinheiten 22 mit einem kreisscheibenförmigen Hammerelement 24 auf. An der Unterseite der axial bewegbaren Hammerelemente 24 sind nicht näher dargestellte Abtragselemente angeordnet, welche vorzugsweise spitz zulaufende Hartmetallelemente sind. Zwischen den einzelnen Hammereinheiten 22 sind Absaugöffnungen 38 zum Absaugen des abgetragenen Bodenmaterials mit umgebender Bohrsuspension angeordnet. Die Absaugöffnungen 38 sind in einer Drehrichtung schräg angestellt, um eine möglichst gute Materialaufnahme zu erreichen.A first rotary drilling tool 10 according to the invention is described below in connection with Figures 1 to 3 explained. The rotary drilling tool 10 is designed as a core drilling tool with an annular arrangement of the removal device 20 around a central hollow core receptacle 16. In the exemplary embodiment shown, the removal device 20 has six identically designed hammer units 22 with a circular disk-shaped hammer element 24. On the underside of the axially movable hammer elements 24, removal elements (not shown) are arranged, which are preferably tapered hard metal elements. Suction openings 38 are arranged between the individual hammer units 22 for suctioning off the removed soil material with the surrounding drilling suspension. The suction openings 38 are set obliquely in one direction of rotation in order to achieve the best possible material absorption.

Das Drehbohrwerkzeug 10 weist ein zylindrisches Gehäuse 14 auf, an dessen oberen Ende eine Verbindungseinrichtung 50 für ein Bohrgestänge angebracht ist. Die Verbindungseinrichtung 50 ist vorzugsweise als eine sogenannte Kellybox zur Aufnahme eines Vierkants eines Bohrgestänges ausgebildet.The rotary drilling tool 10 has a cylindrical housing 14, at the upper end of which a connecting device 50 for a drill pipe is attached. The connecting device 50 is preferably designed as a so-called Kelly box for receiving a square of a drill pipe.

Wie anschaulich in Fig. 2 dargestellt ist, weisen die einzelnen Hammereinheiten 22 ein längliches zylindrisches Zylindergehäuse 28 auf, in welchem ein Kolben 26 reversierend zwischen einer unteren Aufschlagposition und einer oberen Rückzugsposition verschiebbar gelagert ist. An einem unteren Ende des nur andeutungsweise in Fig. 3 dargestellten Kolbens 26 ist das scheibenförmige Hammerelement 24 angebracht.How vivid in Fig. 2 is shown, the individual hammer units 22 have an elongated cylindrical cylinder housing 28, in which a piston 26 is mounted so that it can be moved reversibly between a lower impact position and an upper retraction position. At a lower end of the only hint in Fig. 3 Piston 26 shown, the disk-shaped hammer element 24 is attached.

Die Hammereinheiten 22 werden über eine Zuführleitung 29 mit Druckluft versorgt. Die vertikal nach oben außerhalb des Bohrlochs verlaufende Zuführleitung 29 mündet an ihrem unteren Ende in eine Querleitung 27, welche zu den einzelnen Hammereinheiten 22 führt. Die Querleitung 27 ist zwischen zwei Deckplatten ausgebildet. An einem unteren Endbereich der Hammereinheiten 22 kann verbrauchte Druckluft an der Unterseite des Grundkörpers 12 des Drehbohrwerkzeuges 10 austreten.The hammer units 22 are supplied with compressed air via a supply line 29. The feed line 29, which runs vertically upwards outside the borehole, opens at its lower end into a transverse line 27, which leads to the individual hammer units 22. The transverse line 27 is formed between two cover plates. At a lower end region of the hammer units 22, used compressed air can exit on the underside of the base body 12 of the rotary drilling tool 10.

Abgetragenes Bodenmaterial und umgebende Bohrsuspension sowie austretende Druckluft werden über die schräg gerichteten Absaugöffnungen 38 über die einzelnen Teilabführleitungen 34 abgeführt. Dabei sind die Teilabführleitungen 34 über Querkanäle 35 mit einem Zentralabschnitt 32 einer nach oben geführten Abführleitung 30 verbunden. An dem Zentralabschnitt 32 ist eine im Gehäuse 14 mittig angeordnete Pumpeinrichtung 40 positioniert. Die Pumpeinrichtung 40 wird über eine Energiezuführleitung 44 mit Antriebsenergie, insbesondere elektrischer Energie, von einem Trägergerät außerhalb des Bohrlochs versorgt. Von dem Zentralabschnitt 32 wird das angesaugte Bodenmaterial über die Pumpeinrichtung 40 nach oben über die Abführleitung 30 abgefördert. Die Pumpeinrichtung 40 ist über ein Pumpgehäuse 42 und den Zentralabschnitt 32 fest mit dem Grundkörper 12 des Drehbohrwerkzeugs 10 verbunden.Removed soil material and surrounding drilling suspension as well as escaping compressed air are removed via the obliquely directed suction openings 38 via the individual partial discharge lines 34. The partial discharge lines 34 are connected via transverse channels 35 to a central section 32 of an upwardly guided discharge line 30. A pump device 40 arranged centrally in the housing 14 is positioned on the central section 32. The pump device 40 is supplied with drive energy, in particular electrical energy, from a carrier device outside the borehole via an energy supply line 44. From the central section 32, the sucked-in soil material is conveyed upwards via the discharge line 30 via the pump device 40. The pump device 40 is firmly connected to the base body 12 of the rotary drilling tool 10 via a pump housing 42 and the central section 32.

In den Figuren 4 bis 7 ist ein zweites erfindungsgemäßes Drehbohrwerkzeug 10 dargestellt, welches als ein Vollschnitt-Bohrwerkzeug ausgebildet ist. Das Drehbohrwerkzeug 10 weist ein zylindrisches Gehäuse 14 auf, an dessen unteren Ende eine Abtragseinrichtung 20 angeordnet ist, welche sich im Wesentlichen quer über eine kreisscheibenförmige Bodenplatte 18 erstreckt. Die Abtragseinrichtung 20 ist aus einer Vielzahl von Hammereinheiten 22 mit kreisscheibenförmigen Hammerelementen 24 ausgebildet. Weiterhin sind an der Bodenplatte 18 zwei sich radial erstreckende schlitzförmige Absaugöffnungen 38 zum Absaugen von abgetragenen Bodenmaterial und umgebender Bodensuspension angeordnet. An der Oberseite des Gehäuses 14 ist, wie bei dem zuvor beschriebenen Drehbohrwerkzeug 10, eine Kellybox als Verbindungseinrichtung 50 für ein Bohrgestänge angebracht.In the Figures 4 to 7 a second rotary drilling tool 10 according to the invention is shown, which is designed as a full-cut drilling tool. The rotary drilling tool 10 has a cylindrical housing 14, at the lower end of which a removal device 20 is arranged, which extends essentially transversely over a circular disk-shaped base plate 18. The removal device 20 is formed from a plurality of hammer units 22 with circular disk-shaped hammer elements 24. Furthermore, two radially extending slot-shaped suction openings 38 for suctioning off removed soil material and surrounding soil suspension are arranged on the base plate 18. At the top of the housing 14, as with the rotary drilling tool 10 described above, a Kelly box is attached as a connecting device 50 for a drill pipe.

Innerhalb des zylindrischen Gehäuses 14, welches bei diesem Drehbohrwerkzeug 10 einen wesentlichen Teil des Grundkörpers 12 darstellt, sind die stangenförmigen Hammereinheiten 22 mit ihren jeweiligen Zylindergehäusen 28 angeordnet. Innerhalb der Zylindergehäuse 28 sind über Druckluft angetriebene Kolben 26 zum Ausüben einer Schlagbewegung auf die anstehende Ortsbrust axial reversierend gelagert. An den unteren Enden der Kolben 26 sind scheibenförmige Hammerelemente 24 mit nicht dargestellten Abtragselementen angebracht.The rod-shaped hammer units 22 with their respective cylinder housings 28 are arranged within the cylindrical housing 14, which represents an essential part of the base body 12 in this rotary drilling tool 10. Within the cylinder housing 28, pistons 26 driven by compressed air are mounted in an axially reversible manner in order to exert an impact movement on the existing face. At the lower ends of the pistons 26, disk-shaped hammer elements 24 with removal elements (not shown) are attached.

Abgetragenes Bodenmaterial wird über die beiden länglichen Absaugöffnungen 38 abgesaugt. Dabei weist im vorliegenden Ausführungsbeispiel die Pumpeinrichtung 40 zwei getrennte Pumpen 41 auf, wobei jede Pumpe 41 über eine eigene Abführleitung 30 mit einer Absaugöffnung 38 leitungsverbunden ist.Removed soil material is sucked out via the two elongated suction openings 38. In the present exemplary embodiment, the pump device 40 has two separate pumps 41, each pump 41 being connected to a suction opening 38 via its own discharge line 30.

Zur Zuführung von Druckluft zu den Hammereinheiten 22 ist eine nach oben verlaufende Zuführleitung 29 vorgesehen, welche in ihrem unteren Bereich in einen mittigen Rohrabschnitt 25 mündet, welcher unterhalb der Verbindungseinrichtung 50 ausgebildet ist. Zugeleitete Druckluft wird von dem Rohrabschnitt 25 über eine in einer Deckplatte 17 ausgebildeten Querleitung 27 zu den einzelnen Hammereinheiten 22 weitergeleitet.To supply compressed air to the hammer units 22, an upwardly extending supply line 29 is provided, which opens in its lower region into a central pipe section 25, which is formed below the connecting device 50. Compressed air supplied is forwarded from the pipe section 25 to the individual hammer units 22 via a transverse line 27 formed in a cover plate 17.

Im Betrieb wird das Drehbohrwerkzeug 10 über ein nicht dargestelltes Bohrgestänge drehend angetrieben, so dass die Abtragseinrichtung 20 mit den Hammereinheiten 22 die gesamte anstehende Ortsbrust überstreicht.During operation, the rotary drilling tool 10 is driven in rotation via a drill pipe (not shown), so that the removal device 20 with the hammer units 22 sweeps over the entire working face.

Claims (14)

  1. Rotary drilling tool for producing a bore in the ground, having
    - a base body (12) and
    - a discharge line (30) for discharging removed ground material and drilling suspension,
    - wherein a pumping device (40) is provided and
    - wherein a pumping device (40) is configured for pumping off the removed ground material with drilling suspension through the discharge line (30),
    characterized in that
    - the pumping device (40) is arranged on the base body (12) along the discharge line (30),
    - in that there is provided a removal device (20) arranged on an underside of the base body (12), which removal device comprises a plurality of hammer units (22) which each comprise a hammer element (24) driven in axially reversing manner,
    - in that the hammer elements (24) each comprise a vertically oriented piston which is in each case displaceably mounted in a cylinder housing (28) of the hammer unit (22), and
    - in that on the underside of base body (12) is arranged a plurality of extraction openings (38) for extracting of the removed ground material.
  2. Rotary drilling tool according to claim 1,
    characterized in that
    the at least one hammer unit (22) is operated with compressed air which is supplied via a supply line (29).
  3. Rotary drilling tool according to claim 2,
    characterized in that
    an outlet opening for used compressed air is provided at a lower end region of the at least one hammer unit (22).
  4. Rotary drilling tool according to any one of claims 1 to 3,
    characterized in that
    the pumping device (40) is arranged above the removal device in a housing (14).
  5. Rotary drilling tool according to claim 4,
    characterized in that
    a connecting device (50) for a drill string is arranged on an upper side of the housing (14).
  6. Rotary drilling tool according to any one of claims 1 to 5,
    characterized in that
    the pumping device (40) is arranged on a central portion (32) of the discharge line (30), and
    in that beneath the central portion (32) the discharge line (30) divides into a plurality of discharge sub-lines (34).
  7. Rotary drilling tool according to claim 6,
    characterized in that
    each extraction opening (38) is connected to a discharge sub-line (34) which leads to the central portion (32) with the pumping device (40).
  8. Rotary drilling tool according to any one of claims 1 to 7,
    characterized in that
    the rotary drilling tool (10) is in the form of a full-face drilling tool.
  9. Rotary drilling tool according to any one of claims 1 to 8,
    characterized in that
    the rotary drilling tool (10) is in the form of a core drilling tool.
  10. Rotary drilling tool according to any one of claims 1 to 9,
    characterized in that
    an energy supply line (44) is provided, by means of which the pumping device (40) on the base body (12) is supplied with energy.
  11. Rotary drilling tool according to claim 10,
    characterized in that
    the energy is electrical or hydraulic energy.
  12. Method for producing a bore in the ground by means of a rotary drilling tool (10), in particular, according to any one of claims 1 to 11, in which:
    - ground material is removed by means of a removal device (20) on an underside of a base body (12) of the rotary drilling tool (10), and
    - removed ground material and drilling suspension are discharged by means of a discharge line (30),
    - wherein a pumping device (40) is, by means of which pumping device the removed ground material with drilling suspension is pumped through the discharge line (30) to the outside of a borehole,
    characterized in that
    - the pumping device (40) is arranged on a base body (12) of the rotary drilling tool (10) along the discharge line (20),
    - in that a removal device (20) arranged on the underside comprises a plurality of hammer units (22), in each of which a hammer element (24) is driven in axially reversing manner,
    - in that the hammer elements (24) each have a vertically oriented piston which is in each case displaced in a cylinder housing of the hammer units (22), and
    - in that on the underside of the base body (12) is arranged a plurality of extraction openings (38), through which the removed ground material is extracted.
  13. Method according to claim 12,
    characterized in that
    the hammer unit (22) is operated with compressed air which emerges at an underside of the base body (12).
  14. Method according to claim 12 or 13,
    characterized in that
    the removed ground material and the drilling suspension are extracted via a plurality of extraction openings (38) and a plurality of discharge sub-lines (34) which open out into a central portion (32) on which the pumping device (40) is arranged.
EP16205044.7A 2016-12-19 2016-12-19 Drilling apparatus and method for producing a borehole Active EP3336301B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP16205044.7A EP3336301B1 (en) 2016-12-19 2016-12-19 Drilling apparatus and method for producing a borehole
CN201780078760.6A CN110062834B (en) 2016-12-19 2017-11-27 Rotary drill and method for producing a hole
PCT/EP2017/080474 WO2018114230A1 (en) 2016-12-19 2017-11-27 Rotary drilling tool and method for creating a borehole
US16/469,275 US10934779B2 (en) 2016-12-19 2017-11-27 Rotary drilling tool and method for producing a bore
KR1020197016971A KR102328874B1 (en) 2016-12-19 2017-11-27 Rotary drilling tools and methods for creating bores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16205044.7A EP3336301B1 (en) 2016-12-19 2016-12-19 Drilling apparatus and method for producing a borehole

Publications (2)

Publication Number Publication Date
EP3336301A1 EP3336301A1 (en) 2018-06-20
EP3336301B1 true EP3336301B1 (en) 2023-09-13

Family

ID=57570695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16205044.7A Active EP3336301B1 (en) 2016-12-19 2016-12-19 Drilling apparatus and method for producing a borehole

Country Status (5)

Country Link
US (1) US10934779B2 (en)
EP (1) EP3336301B1 (en)
KR (1) KR102328874B1 (en)
CN (1) CN110062834B (en)
WO (1) WO2018114230A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3336301B1 (en) * 2016-12-19 2023-09-13 BAUER Maschinen GmbH Drilling apparatus and method for producing a borehole
DE102019120019A1 (en) * 2019-07-24 2021-01-28 Herrenknecht Ag Boring head for drilling a hole in the ground
PL4008877T3 (en) 2020-12-07 2023-09-11 Eurodrill Gmbh Drilling drive device for an earth boring machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790391A (en) * 1985-10-04 1988-12-13 Tone Boring Co., Ltd. Air pressure impact drilling method and apparatus for same
EP2592214A1 (en) * 2011-11-10 2013-05-15 Chuan Home Machinery Co., Ltd. Air pressure reused pneumatic hammer drill
EP2703596A1 (en) * 2012-08-31 2014-03-05 BAUER Maschinen GmbH Drilling device and method for producing a borehole

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191013575A (en) * 1910-06-04 1911-06-01 Elisha Tippett Improvements in or relating to Rock-drilling Machines, for Removing the Detritus or Cuttings from the Holes Formed therewith.
US1891416A (en) * 1929-07-26 1932-12-20 Irving C Harris Well drilling machine
DE1187566B (en) * 1962-07-10 1965-02-25 Sandvikens Jernverks Ab Drilling tool for hammer drilling with a rotating drill
PL108667B1 (en) * 1976-07-17 1980-04-30 Ts Osrodek P K Maszyn Gorniczy Rotational-percussive drill
FR2409373A1 (en) * 1977-11-21 1979-06-15 Stenuick France DEVICE FOR DRILLING HOLES IN THE SOIL, INCLUDING A PNEUMATIC HAMMER EQUIPPED WITH AN ECCENTER SIZE
SE8104328L (en) * 1981-07-13 1983-01-14 Nyman Karl Erik HYDRAULIC SINK DRILLING MACHINE
SE501988C2 (en) * 1989-04-05 1995-07-10 Uniroc Ab Drilling tools for drilling in soil and covered rock
US5009271A (en) * 1990-07-16 1991-04-23 Milan Maric Drill assembly
US5267622A (en) * 1992-06-22 1993-12-07 Fletcher Gerald L Impact block assembly for percussion drilling apparatus
US5586609A (en) * 1994-12-15 1996-12-24 Telejet Technologies, Inc. Method and apparatus for drilling with high-pressure, reduced solid content liquid
US6209665B1 (en) * 1996-07-01 2001-04-03 Ardis L. Holte Reverse circulation drilling system with bit locked underreamer arms
US6189630B1 (en) * 1998-06-17 2001-02-20 Beck, Iii August H. Downhole hammer-type core barrel
US6607046B1 (en) * 1999-11-12 2003-08-19 Shell Oil Company Expandable drill bit
AT501696B1 (en) * 2004-03-30 2008-03-15 Alwag Tunnelausbau Gmbh METHOD AND DEVICE FOR DRILLING HOLES IN SOIL OR ROCK MATERIAL
KR100656190B1 (en) * 2005-03-19 2006-12-13 (주)하이탑 Combination Hammer for driving a horizontal tube
CA2676350C (en) * 2007-01-24 2015-12-01 J. I. Livingstone Enterprises Ltd. Air hammer coring apparatus and method
CN201024890Y (en) * 2007-04-28 2008-02-20 张小臣 Hydro-impact rotary drilling tool
DE102008028997B4 (en) * 2008-06-20 2012-03-01 Dr. Sven Becker und Dr. Michael Bahns GbR (vertretungsberechtigter Gesellschafter: Dr. Sven Becker, 30655 Hannover) Drilling method and drill for making a well in soil and rock
KR101192120B1 (en) * 2010-03-09 2012-10-17 (주)동우기계 A cluster hammer
EP2597249B1 (en) * 2011-11-24 2014-09-10 Bauer Spezialtiefbau GmbH Drilling device and method for creating a vertical borehole
CN102966304B (en) * 2012-11-28 2014-12-31 吉林大学 Mud retaining wall and air down-the-hole hammer drilling tool and drilling technology
KR101508740B1 (en) * 2014-04-22 2015-04-07 주식회사 우리기초 Excavation hammer for core separate function having core barrel work
CN103967421B (en) * 2014-05-28 2016-05-25 吉林大学 A kind of strong pumping formula reverse cycle coring drill bit
KR20160004494A (en) * 2014-07-02 2016-01-13 우복기초 주식회사 Doughnut hammer apparatus and excavation method therefor
KR101627822B1 (en) * 2014-09-19 2016-06-07 광성지엠(주) Reverse circulation drilling apparatus having a casing
HUE050174T2 (en) * 2014-11-14 2020-11-30 Strada Design Ltd Dual circulation fluid hammer drilling system
EP3336301B1 (en) * 2016-12-19 2023-09-13 BAUER Maschinen GmbH Drilling apparatus and method for producing a borehole

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790391A (en) * 1985-10-04 1988-12-13 Tone Boring Co., Ltd. Air pressure impact drilling method and apparatus for same
EP2592214A1 (en) * 2011-11-10 2013-05-15 Chuan Home Machinery Co., Ltd. Air pressure reused pneumatic hammer drill
EP2703596A1 (en) * 2012-08-31 2014-03-05 BAUER Maschinen GmbH Drilling device and method for producing a borehole

Also Published As

Publication number Publication date
CN110062834A (en) 2019-07-26
KR20190085034A (en) 2019-07-17
US10934779B2 (en) 2021-03-02
CN110062834B (en) 2021-09-28
WO2018114230A1 (en) 2018-06-28
US20200102790A1 (en) 2020-04-02
EP3336301A1 (en) 2018-06-20
KR102328874B1 (en) 2021-11-18

Similar Documents

Publication Publication Date Title
DE10308538C5 (en) Method of making a trench wall in the ground, trench wall cutter and trench wall cutter
EP0434924B1 (en) Apparatus for drilling an offset or side-tracked well, especially from a cased well
EP3336301B1 (en) Drilling apparatus and method for producing a borehole
DE1458675A1 (en) Method for sinking Schaechten or for driving on routes or the like. in mining and tunnel operations as well as machines for carrying out the process
DE4220430C2 (en) Method and device for making an earth borehole
EP2251491A1 (en) Milling device and method for removing soil material
DE602004003493T2 (en) DRILLING DRILL, DRILLING SYSTEM WITH SUCH A DRILL AND METHOD FOR DRILLING A DRILLING HOLE
EP3339568A1 (en) Tool and method for breaking up rock
DE19609899A1 (en) Device for producing an earth hole
DE3842891A1 (en) ROTATIONAL DRILLING METHOD AND ROTATIONAL DRILLING DEVICE FOR CARRYING OUT THE METHOD
EP3294500B1 (en) Method and drive-out device for driving out a blade
EP2395153B1 (en) Device and method for manufacturing wall panels in the floor
EP2866993B1 (en) Cable saw
DE3337931C1 (en) Tool body for a rotatable drilling tool
CH665877A5 (en) DRILLING DEVICE FOR PRODUCING HOLES IN STONE.
DE2505299A1 (en) DRILLING TOOL FOR ANY TERRAIN
EP3327247A1 (en) Drilling device and method for rock drilling
EP1012440B1 (en) Boring device
DE4412776C1 (en) Supporting unit to grip and feed the drill string of a boring tool
DE975591C (en) Drill bit with open channels at the front for the dry extraction of rock dust
DE102016103507A1 (en) Apparatus and method for longitudinal lining of liner pipes with a slotted tool and subsequent Wegfräsen the previously slit pipe walls
DE4408514C1 (en) Drilling tool for producing holes in ground
DE897232C (en) Process for the extraction of coal
DE19740078A1 (en) Drifting method with combined vibrating and regularly working tool
WO2021023543A1 (en) System and method for driving a machine tool into a wall or a substrate

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170802

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): 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

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20200416

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20230515

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230726

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): 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

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502016016087

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: NO

Ref legal event code: T2

Effective date: 20230913

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20230913

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20231214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20231214

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20231214

Year of fee payment: 8

Ref country code: NO

Payment date: 20231215

Year of fee payment: 8

Ref country code: IE

Payment date: 20231204

Year of fee payment: 8

Ref country code: DE

Payment date: 20231205

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240113

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240113

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20230913

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240115

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20240101

Year of fee payment: 8