EP1519000B1 - Displacement drilling tool and method of use - Google Patents

Displacement drilling tool and method of use Download PDF

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Publication number
EP1519000B1
EP1519000B1 EP04020562A EP04020562A EP1519000B1 EP 1519000 B1 EP1519000 B1 EP 1519000B1 EP 04020562 A EP04020562 A EP 04020562A EP 04020562 A EP04020562 A EP 04020562A EP 1519000 B1 EP1519000 B1 EP 1519000B1
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EP
European Patent Office
Prior art keywords
drill rod
displacement
drilling tool
head
flight
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EP04020562A
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German (de)
French (fr)
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EP1519000A1 (en
Inventor
Erwin Emil Stötzer
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Bauer Maschinen GmbH
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Bauer Maschinen GmbH
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/72—Pile shoes
    • 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
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • 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
    • E21B7/26—Drilling without earth removal, e.g. with self-propelled burrowing devices

Definitions

  • Such a method is also known as displacement displacement with lost displacer head.
  • the displacer remains in the ground and forms the footprint for a concrete or stabilizing column made above. For this purpose, after retraction of the drill string in the hole produced concrete or other contents are introduced.
  • the invention has for its object to provide a drilling tool and a method for positive displacement drilling in the ground, with which holes can be produced with a particularly stable borehole.
  • the drilling tool according to the invention is characterized in that the lower end of the drill string is designed as a displacement area which widens opposite the adjacent drill string area.
  • the widened displacer area formed at the lower end of the drill string can thus once again contribute to the smoothing of the borehole wall during the retraction of the drill string.
  • the additional displacement of soil material in the borehole wall when retracting the drill string to an additional compaction and solidification and thus stabilization of the borehole wall.
  • the displacer region on the drill string has an outer diameter which is equal to or smaller than the outer diameter of the outer spiral of the displacer head.
  • the outer diameter of the displacer is smaller by up to 10 to 20% than the outer diameter of the outer coil.
  • a further improvement of the compression effect is achieved according to the invention in that a drill string helix is formed on the drill string area which adjoins the displacement area.
  • the drill string helix is wound opposite to the outer helix of the displacer head. In this way, with an opposite rotation of the drill string when retreating against the penetration, the desired conveying effect can be achieved to the displacer.
  • reinforcing elements can be fastened to the displacement head.
  • These can be steel cables or metal bars be, which represent a reinforcement, for example, in a concrete column.
  • the inventive method is characterized in that at the lower end of the drill string a displacer is formed, with which when retracting the drill string from above coming drilling material is displaced laterally.
  • an outer spiral is formed on the displacer head, wherein the drill string is rotated during introduction into the ground in a direction in which the outer coil promotes soil material laterally and upwards.
  • the displacer thus fulfills the essential compaction effect when screwed into the ground.
  • a preferred embodiment of the invention is that the displacer is released by rotating in the opposite direction and / or by activating a release device from the drill string.
  • a simple screw connection between the displacer head and the drill string.
  • it may also be another connection device, such as a bayonet lock or a release device with a mechanically or electrically adjustable locking element, which allows reliable release of the displacer head of the drill string.
  • An additional compression is achieved according to the invention in that a drill string helix is formed on the drill string area which adjoins the displacement area wherein, upon retraction, the drill string is rotated in a direction in which the drill string helix from above conveys the soil material into the displacer region.
  • a drill string helix is formed on the drill string area which adjoins the displacement area wherein, upon retraction, the drill string is rotated in a direction in which the drill string helix from above conveys the soil material into the displacer region.
  • from the top of the soil material can be pressed into a relatively narrow gap between the displacement and the borehole wall.
  • the borehole produced when filling the drill string is filled with a filling material.
  • the borehole wall is reliably supported at all times by the drilling tool or the filling material itself.
  • the single drawing shows a side view of a drilling tool 10 according to the invention.
  • the drilling tool 10 has a conical displacement head 40 for displacement drilling, on the outside of which an outer spiral 42 is formed.
  • peg-shaped drivers 44 are formed on the upper side of the displacer head 40, which engage in corresponding recesses 34 at the lower end of the drill string 20.
  • the tubular drill string 20 has at its lower end a widened displacement region 30, which merges via a cone 32 into an adjacent drill string region 22 with a substantially constant outer diameter.
  • a drill string helix 24 is formed whose maximum outer diameter corresponds approximately to the outer diameter of the widened cylindrical displacement area 30.
  • the Bohrstrangchtl 24 extends to the cylindrical portion of the displacer head 30 and runs in the portion of the cone 32 gradually.
  • the displacer head 40 has in its upper region a base cylinder 46 with an outer diameter which corresponds to the outer diameter of the displacer 30.
  • the protruding outer coils 42 of the displacer head 40 produce a disturbing zone in the borehole wall during displacement drilling.
  • the drill string 20 is slowly pulled out of the wellbore with opposite rotation.
  • Subsequent soil material from the fault zone of the borehole wall is conveyed downwards through the drill string helix 24 to the displacer region 30. Due to the outer diameter of the displacement area 30, the soil material is displaced into the borehole wall, in particular into the fault zone of the borehole wall.
  • the borehole wall is smoothed and additionally compacted.
  • soil material is prevented from accumulating on the lost displacer head 40 and forming imperfections in a concrete column to be produced.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Piles And Underground Anchors (AREA)
  • Soil Working Implements (AREA)
  • Drilling And Boring (AREA)

Abstract

An earth drill has a helical thread and shank that widens (32) to a larger diameter section (30) that terminates in a detachable cutting tip (46). After drilling to the required depth, the shank is detached from the cutting tip and withdrawn, thereby displacing the loose soil.

Description

Die Erfindung betrifft zum einen ein Bohrwerkzeug zum Verdrängungsbohren im Boden, mit einem Bohrstrang, an dessen unterem Ende ein Verdrängerkopf lösbar befestigt ist. Zum anderen betrifft die Erfindung ein Verfahren zum Verdrängungsbohren im Boden, bei dem ein Verdrängerkopf, welcher an einem unteren Ende eines Bohrstranges lösbar befestigt ist, unter Verdrängung von Bodenmaterial in den Boden bis zu einer vorgesehenen Tiefe eingebracht wird, in welcher der Bohrstrang vom Verdrängerkopf gelöst und aus dem Boden zurückgezogen wird.The invention relates firstly to a drilling tool for positive displacement drilling in the ground, with a drill string at whose lower end a displacer head is releasably secured. On the other hand, the invention relates to a method for positive displacement drilling in the ground, in which a displacer head, which is releasably attached to a lower end of a drill string, is introduced into the ground to displace soil material to a predetermined depth, in which the drill string is released from the displacer head and pulled back from the ground.

Ein derartiges Verfahren ist auch als Verdrängungsbohren mit verlorenem Verdrängerkopf bekannt. Der Verdrängerkopf verbleibt dabei im Boden und bildet die Aufstandsfläche für eine darüber hergestellte Beton- oder Stabilisierungssäule. Hierzu wird nach dem Zurückziehen des Bohrstranges in das erzeugte Bohrloch Beton oder ein anderes Füllgut eingeleitet.Such a method is also known as displacement displacement with lost displacer head. The displacer remains in the ground and forms the footprint for a concrete or stabilizing column made above. For this purpose, after retraction of the drill string in the hole produced concrete or other contents are introduced.

Die US-A-5 833 399 beschreibt ein Bohrwerkzeug und ein Verfahren zum Verdrängungsbohren im Boden, mit einem Bohrstrang, an dessen unterem Ende ein Verdrängerkopf lösbar befestigt ist, wobei das untere Ende des Bohrstranges als ein Verdrängerbereich ausgebildet ist, welcher gegenüber dem angrenzenden Bohrstrangbereich aufgeweitet ist. Dabei wird ein Verdrängerkopf unter Verdrängung von Bodenmaterial in den Boden bis zu einer vorgesehenen Tiefe eingebracht wird, in welcher der Bohrstrang vom Verdrängerkopf gelöst und aus dem Boden zurückgezogen wird.US-A-5 833 399 discloses a drilling tool and method for positive displacement drilling in the ground, comprising a drill string at the lower end of which a displacer head is releasably secured, the lower end of the drill string being formed as a displacer region opposite the adjacent drill string portion is widened. In this case, a displacement head is placed under displacement of soil material in the ground to a designated depth, in which the drill string is released from the displacer head and withdrawn from the ground.

Bei diesem bekannten Verfahren besteht das Problem, dass bei bestimmten Bodenverhältnissen keine stabile Bohrlochwandung erzeugt wird. Das heißt, Bodenmaterial kann vor dem Befüllen des erzeugten Bohrloches von der Bohrlochwandung nach unten fallen. Dieses Bodenmaterial stellt in der zu erzeugenden Beton- oder Stabilisierungssäule Fehlstellen dar, welche die Tragfähigkeit der erzeugten Säule beeinträchtigen.In this known method, there is the problem that in certain soil conditions no stable borehole wall is generated. That is, soil material may fall down from the borehole wall prior to filling the created wellbore. This soil material is in the concrete or stabilizing column to be generated flaws that affect the carrying capacity of the column produced.

Der Erfindung liegt die Aufgabe zugrunde, ein Bohrwerkzeug und ein Verfahren zum Verdrängungsbohren im Boden anzugeben, mit welchen Bohrlöcher mit einer besonders stabilen Bohrlochwandung erzeugt werden können.The invention has for its object to provide a drilling tool and a method for positive displacement drilling in the ground, with which holes can be produced with a particularly stable borehole.

Die Aufgabe wird erfindungsgemäß zum einen durch ein Bohrwerkzeug mit den Merkmalen des Anspruchs 1 und zum anderen mit einem Verfahren mit den Merkmalen des Anspruchs 9 gelöst. Bevorzugte Ausführungsformen der Erfindung sind in den jeweiligen abhängigen Ansprüchen angegeben.The object is achieved on the one hand by a drilling tool with the features of claim 1 and on the other hand with a method having the features of claim 9. Preferred embodiments of the invention are set forth in the respective dependent claims.

Das erfindungsgemäße Bohrwerkzeug ist dadurch gekennzeichnet, dass das untere Ende des Bohrstranges als ein Verdrängerbereich ausgebildet ist, welcher gegenüber dem angrenzenden Bohrstrangbereich aufweitet ist. Nach dem Lösen des Verdrängerkopfes kann somit der am unteren Ende des Bohrstranges ausgebildete aufgeweitete Verdrängerbereich nochmals zur Glättung der Bohrlochwandung beim Zurückziehen des Bohrstranges beitragen. Insbesondere kann durch den Verdrängerbereich von oben nachfallendes Bodenmaterial in die Bohrlochwandung verdrängt werden. Hierdurch wird einerseits verhindert, dass sich unerwünschtes Bodenmaterial im zu verfüllenden Hohlraum des Bohrloches ansammelt. Andererseits führt das zusätzliche Verdrängen von Bodenmaterial in die Bohrlochwandung beim Zurückziehen des Bohrstranges zu einer zusätzlichen Verdichtung und Verfestigung und damit Stabilisierung der Bohrlochwandung.The drilling tool according to the invention is characterized in that the lower end of the drill string is designed as a displacement area which widens opposite the adjacent drill string area. After the displacer head has been released, the widened displacer area formed at the lower end of the drill string can thus once again contribute to the smoothing of the borehole wall during the retraction of the drill string. In particular, can be displaced by the displacer from above falling soil material into the borehole wall. As a result, it is prevented on the one hand that undesired soil material accumulates in the cavity of the borehole to be filled. On the other hand, the additional displacement of soil material in the borehole wall when retracting the drill string to an additional compaction and solidification and thus stabilization of the borehole wall.

Der Verdrängerbereich kann grundsätzlich verschiedene Formen, etwa eine rein konische oder eine ballige Form, aufweisen. Erfindungsgemäß ist es jedoch, dass der Verdrängerbereich ein zylindrisches Segment aufweist, welches allmählich, insbesondere konisch, in den angrenzenden Bohrstrangbereich übergeht. Ein zylindrisches Segment lässt sich fertigungstechnisch besonders kostengünstig verwirklichen. Zudem wird über die gesamte Länge des Zylindersegmentes eine gleichmäßige Verdrängungswirkung erzielt. Neben einer rein konischen Form des Übergangsbereiches zum Verdrängerbereich kann auch ein anderer stetiger kurvenförmiger Verlauf, etwa bogenförmig oder viertelkreisförmig, vorgesehen sein.The displacer region can basically have different shapes, for example a purely conical or a crowned shape. According to the invention, however, that the displacer has a cylindrical segment, which gradually, in particular conically, merges into the adjacent drill string area. A cylindrical segment can be realized in a particularly cost-effective manufacturing technology. In addition, a uniform displacement effect is achieved over the entire length of the cylinder segment. In addition to a purely conical shape of the transition region to the displacer region, it is also possible to provide another continuous curve-shaped course, for example in an arcuate or a quarter-circle form.

Für eine gute Verdrängerwirkung ist es erfindungsgemäß, dass der Verdrängerkopf eine Außenwendel aufweist. Der Verdränger kopf kann hierdurch in den Boden eingeschraubt werden, wodurch sich eine besonders gute Verdrängungswirkung erzielen lässt. Der Verdrängerkopf kann nicht nur aus Stahl sondern auch aus Kunststoff, Faserbeton oder einem anderen geeigneten Material sein.For a good displacement effect, it is according to the invention that the displacement head has an outer spiral. The displacer Head can thereby be screwed into the ground, which can achieve a particularly good displacement effect. The displacer head may be not only steel but also plastic, fiber concrete or other suitable material.

Nach der Erfindung ist es von Vorteil, das der Verdrängerbereich am Bohrstrang einen Außendurchmesser aufweist, welcher gleich oder kleiner als der Außendurchmesser der Außenwendel des Verdrängerkopfes ist. Vorzugsweise ist der Außendurchmesser des Verdrängerbereiches um bis zu 10 bis 20 % kleiner als der Außendurchmesser der Außenwendel. Auch bei diesem Untermaß wird eine gute Glättung und Verdichtung der Bohrlochwandung erzeugt, welche aufgrund der Einschraubbewegung des Verdrängerkopfes Ungleichmäßigkeiten aufweist. Eine besonders gute Verdichtungswirkung wird erfindungsgemäß dadurch erzielt, dass der Außendurchmesser des Verdrängerbereiches etwa dem Außendurchmesser der Außenwendel des Verdrängerkopfes entspricht.According to the invention, it is advantageous that the displacer region on the drill string has an outer diameter which is equal to or smaller than the outer diameter of the outer spiral of the displacer head. Preferably, the outer diameter of the displacer is smaller by up to 10 to 20% than the outer diameter of the outer coil. Even with this undersize good smoothing and compression of the borehole wall is generated, which has irregularities due to the screwing of the displacer. A particularly good compaction effect is achieved according to the invention in that the outer diameter of the displacer region corresponds approximately to the outer diameter of the outer spiral of the displacer head.

Eine weitere Verbesserung der Verdichtungswirkung wird erfindungsgemäß dadurch erreicht, dass an dem Bohrstrangbereich, welcher an den Verdrängerbereich angrenzt, eine Bohrstrangwendel ausgebildet ist. Durch diese Bohrstrangwendel kann von oben nachfallendes Material bei einer entsprechenden Drehbewegung des Bohrstranges gezielt in den Verdrängerbereich gefördert werden.A further improvement of the compression effect is achieved according to the invention in that a drill string helix is formed on the drill string area which adjoins the displacement area. By means of this drill string helix, material falling down from above can be specifically conveyed into the displacer area during a corresponding rotational movement of the drill string.

Weiter ist es nach der Erfindung bevorzugt, dass die Bohrstrangwendel entgegengesetzt zur Außenwendel des Verdrängerkopfes gewunden ist. Auf diese Weise kann bei einer entgegengesetzten Drehung des Bohrstranges beim Zurückziehen gegenüber dem Eindringvorgang die gewünschte Förderwirkung zum Verdrängerbereich erzielt werden.Further, it is preferred according to the invention that the drill string helix is wound opposite to the outer helix of the displacer head. In this way, with an opposite rotation of the drill string when retreating against the penetration, the desired conveying effect can be achieved to the displacer.

Zur Erzeugung besonders stabiler Gründungssäulen im Boden ist es erfindungsgemäß, dass an dem Verdrängerkopf Armierungselemente befestigbar sind. Dies können Stahlseile oder Metallstangen sein, welche beispielsweise in einer Betonsäule eine Armierung darstellen.To produce particularly stable foundation columns in the ground, it is according to the invention that reinforcing elements can be fastened to the displacement head. These can be steel cables or metal bars be, which represent a reinforcement, for example, in a concrete column.

Zum Verfüllen des erzeugten Bohrloches ist es nach der Erfindung vorgesehen, dass der Bohrstrang zum Einleiten eines Füllgutes rohrförmig ausgebildet ist. Somit kann das Füllgut durch den inneren Hohlraum bereits beim Zurückziehen des Bohrstranges eingefüllt werden, so dass hierdurch eine Abstützung der Bohrlochwandung erreicht wird.To fill the generated borehole, it is provided according to the invention that the drill string for introducing a filling material is tubular. Thus, the contents can be filled through the inner cavity already upon retraction of the drill string, so that in this way a support of the borehole wall is achieved.

Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass am unteren Ende des Bohrstranges ein Verdrängerbereich ausgebildet ist, mit welchem beim Zurückziehen des Bohrstranges von oben kommendes Bohrmaterial seitlich verdrängt wird. Mit diesem Verfahren lassen sich die vorbeschriebenen Vorteile einer stabilen Bohrlochwandung erreichen.The inventive method is characterized in that at the lower end of the drill string a displacer is formed, with which when retracting the drill string from above coming drilling material is displaced laterally. With this method, the above-described advantages of a stable borehole wall can be achieved.

Zur Erzeugung des Bohrloches ist es bevorzugt, dass an dem Verdrängerkopf eine Außenwendel ausgebildet ist, wobei der Bohrstrang beim Einbringen in den Boden in eine Richtung gedreht wird, in welcher die Außenwendel Bodenmaterial seitlich und nach oben fördert. Der Verdrängerkopf erfüllt somit die wesentliche Verdichtungswirkung beim Eindrehen in den Boden.To produce the borehole, it is preferred that an outer spiral is formed on the displacer head, wherein the drill string is rotated during introduction into the ground in a direction in which the outer coil promotes soil material laterally and upwards. The displacer thus fulfills the essential compaction effect when screwed into the ground.

Eine bevorzugte Weiterbildung der Erfindung besteht darin, dass der Verdrängerkopf durch Drehen in entgegengesetzte Richtung und/oder durch Aktivieren einer Löseeinrichtung vom Bohrstrang gelöst wird. Im ersteren Fall kann eine einfache Schraubverbindung zwischen dem Verdrängerkopf und dem Bohrstrang bestehen. Es kann jedoch auch eine andere Verbindungseinrichtung, etwa ein Bajonettverschluss oder eine Löseeinrichtung mit einem mechanisch oder elektrisch zu verstellenden Sperrelement bestehen, welches ein zuverlässiges Lösen des Verdrängerkopfes vom Bohrstrang erlaubt.A preferred embodiment of the invention is that the displacer is released by rotating in the opposite direction and / or by activating a release device from the drill string. In the former case, there may be a simple screw connection between the displacer head and the drill string. However, it may also be another connection device, such as a bayonet lock or a release device with a mechanically or electrically adjustable locking element, which allows reliable release of the displacer head of the drill string.

Eine zusätzliche Verdichtung wird nach der Erfindung dadurch erreicht, dass an dem Bohrstrangbereich, welcher an den Verdrängerbereich angrenzt, eine Bohrstrangwendel ausgebildet ist, wobei beim Zurückziehen der Bohrstrang in eine Richtung gedreht wird, in welcher die Bohrstrangwendel von oben kommen des Bodenmaterial in den Verdrängerbereich fördert. Hierbei kann von oben kommen des Bodenmaterial auch in einen relativ engen Spalt zwischen den Verdrängerbereich und der Bohrlochwandung gepresst werden.An additional compression is achieved according to the invention in that a drill string helix is formed on the drill string area which adjoins the displacement area wherein, upon retraction, the drill string is rotated in a direction in which the drill string helix from above conveys the soil material into the displacer region. Here, from the top of the soil material can be pressed into a relatively narrow gap between the displacement and the borehole wall.

Zur Herstellung armierter Säulen im Boden ist es erfindungsgemäß, dass beim Zurückziehen Armierungselemente, welche am Verdrängerkopf befestigt sind, mit nach oben geführt werden.For the production of reinforced columns in the ground, it is according to the invention that, when pulled back, reinforcing elements which are fastened to the displacer head are guided upwards.

Weiter ist es bevorzugt, dass das erzeugte Bohrloch beim Zurückziehen des Bohrstranges mit einem Füllgut verfüllt wird. Auf diese Weise wird die Bohrlochwandung jederzeit durch das Bohrwerkzeug oder das Füllgut selbst zuverlässig abgestützt.Further, it is preferred that the borehole produced when filling the drill string is filled with a filling material. In this way, the borehole wall is reliably supported at all times by the drilling tool or the filling material itself.

Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispiels näher erläutert, welches schematisch in der beigefügten Zeichnung dargestellt ist.The invention will be explained in more detail below with reference to a preferred embodiment, which is shown schematically in the accompanying drawing.

Die einzige Zeichnung zeigt eine Seitenansicht eines erfindungsgemäßen Bohrwerkzeuges 10.The single drawing shows a side view of a drilling tool 10 according to the invention.

Das Bohrwerkzeug 10 weist zum Verdrängungsbohren einen konischen Verdrängerkopf 40 auf, an dessen Außenseite eine Außenwendel 42 ausgebildet ist. Zum Verbinden mit einem Bohrstrang 20 sind an der Oberseite des Verdrängerkopfes 40 zapfenförmige Mitnehmer 44 ausgebildet, welche in entsprechende Ausnehmungen 34 am unteren Ende des Bohrstranges 20 eingreifen.The drilling tool 10 has a conical displacement head 40 for displacement drilling, on the outside of which an outer spiral 42 is formed. For connecting to a drill string 20, peg-shaped drivers 44 are formed on the upper side of the displacer head 40, which engage in corresponding recesses 34 at the lower end of the drill string 20.

Der rohrförmig ausgebildete Bohrstrang 20 weist an seinem unteren Ende einen aufgeweiteten Verdrängerbereich 30 auf, welcher über einen Konus 32 in einen angrenzenden Bohrstrangbereich 22 mit einem im Wesentlichen konstanten Außendurchmesser übergeht. Am Außenumfang des Bohrstrangbereiches 22 ist eine Bohrstrangwendel 24 ausgebildet, deren maximaler Außendurchmesser etwa dem Außendurchmesser des aufgeweiteten zylindrisch ausgebildeten Verdrängerbereiches 30 entspricht. Die Bohrstrangwendel 24 erstreckt sich bis zu dem zylindrischen Bereich des Verdrängerkopfes 30 und läuft im Abschnitt des Konus 32 allmählich aus.The tubular drill string 20 has at its lower end a widened displacement region 30, which merges via a cone 32 into an adjacent drill string region 22 with a substantially constant outer diameter. On the outer circumference of the drill string area 22, a drill string helix 24 is formed whose maximum outer diameter corresponds approximately to the outer diameter of the widened cylindrical displacement area 30. The Bohrstrangwendel 24 extends to the cylindrical portion of the displacer head 30 and runs in the portion of the cone 32 gradually.

Bei der dargestellten Ausführungsform weist der Verdrängerkopf 40 in seinem oberen Bereich einen Grundzylinder 46 mit einem Außendurchmesser auf, welcher dem Außendurchmesser des Verdrängerbereichs 30 entspricht. Die demgegenüber vorstehenden Außenwendeln 42 des Verdrängerkopfes 40 erzeugen beim Verdrängungsbohren eine Störzone in der Bohrlochwandung. Nach dem Lösen vom Verdrängerkopf 40 bei einer vorgesehenen Endtiefe des Bohrloches wird der Bohrstrang 20 bei entgegengesetzter Drehung langsam aus dem Bohrloch gezogen. Von oben nachfallendes Bodenmaterial aus der Störzone der Bohrlochwandung wird über die Bohrstrangwendel 24 nach unten zum Verdrängerbereich 30 gefördert. Aufgrund des Außendurchmessers des Verdrängerbereichs 30 wird das Bodenmaterial in die Bohrlochwandung, insbesondere in die Störzone der Bohrlochwandung, verdrängt. Hierdurch wird die Bohrlochwandung geglättet und zusätzlich verdichtet. Gleichzeitig wird verhindert, dass Bodenmaterial sich auf dem verlorenen Verdrängerkopf 40 ansammelt und Fehlstellen in einer zu erzeugenden Betonsäule bildet.In the illustrated embodiment, the displacer head 40 has in its upper region a base cylinder 46 with an outer diameter which corresponds to the outer diameter of the displacer 30. The protruding outer coils 42 of the displacer head 40 produce a disturbing zone in the borehole wall during displacement drilling. After disengaging from the displacer head 40 at a designated final depth of the wellbore, the drill string 20 is slowly pulled out of the wellbore with opposite rotation. Subsequent soil material from the fault zone of the borehole wall is conveyed downwards through the drill string helix 24 to the displacer region 30. Due to the outer diameter of the displacement area 30, the soil material is displaced into the borehole wall, in particular into the fault zone of the borehole wall. As a result, the borehole wall is smoothed and additionally compacted. At the same time, soil material is prevented from accumulating on the lost displacer head 40 and forming imperfections in a concrete column to be produced.

Claims (14)

  1. Drilling tool for displacement drilling in the soil, comprising a drill rod (20), on the lower end of which a displacement head (40) is detachably fixed, and a displacement portion (30) formed on the drill rod (20), which is widened with respect to the adjoining drill rod portion (22),
    characterized in that
    the displacement portion (30) is designed cylindrical for the smoothing of the drill hole wall and forms the lower end of the drill rod (20), on which the displacement head (40) is detachably fixed.
  2. Drilling tool according to claim 1,
    characterized in that
    the displacement portion (30) merges gradually, in particular in a tapered fashion, into the adjoining drill rod portion (22).
  3. Drilling tool according to claim 1 or 2,
    characterized in that
    the displacement head (40) has an external flight (42).
  4. Drilling tool according to claim 3,
    characterized in that
    the displacement portion (30) on the drill rod (20) has an external diameter which is equal to or smaller than the external diameter of the external flight (42) of the displacement head (40).
  5. Drilling tool according to claims 1 to 4,
    characterized in that
    a drill rod flight (24) is provided on the drill rod portion (22) adjoining the displacement portion (30).
  6. Drilling tool according to claim 5,
    characterized in that
    the drill rod flight (24) is wound in an opposite direction to the external flight (42) of the displacement head (40) .
  7. Drilling tool according to claims 1 to 6,
    characterized in that
    reinforcement elements are fixed to the displacement head (40).
  8. Drilling tool according to claims 1 to 7,
    characterized in that
    the drill rod (20) is designed in a tubular shape for the introduction of a filling material.
  9. Method for displacement drilling in the soil, particularly with a drilling tool (10) according to claims 1 to 8, in which a displacement head (40), which is detachably fixed to a lower end of a drill rod (20), is placed into the soil up to an intended depth whilst displacing soil material, at which depth the drill rod (20) is detached from the displacement head (40) and extracted from the soil, and a displacement portion (30) formed on the drill rod (20), which is widened with respect to the adjoining drill rod portion (22),
    characterized in that
    during the extraction of the drill rod (20) a cylindrical displacement portion (30) forming the lower end of the drill rod (20) smoothes the drill hole wall.
  10. Method according to claim 9,
    characterized in that
    an external flight (42) is provided on the displacement head (40), with the drill rod (20) being rotated into a direction during the placing into the soil, in which the external flight (42) conveys soil material laterally and upwards.
  11. Method according to claim 10,
    characterized in that
    the displacement head (40) is detached from the drill rod (20) by rotating into the opposite direction and/or by activating a detachment device.
  12. Method according to claims 9 to 11,
    characterized in that
    a drill rod flight (24) is provided on the drill rod portion (22) adjoining the displacement portion (30), with the drill rod (20) being rotated into a direction during the extraction, in which the drill rod flight (24) conveys soil material falling from above into the displacement portion (30).
  13. Method according to claims 9 to 12,
    characterized in that
    reinforcement elements, which are fixed to the displacement head (40), are also guided upwards during the extraction.
  14. Method according to claims 9 to 13,
    characterized in that
    the drill hole produced is filled with a filling material during the extraction of the drill rod (20).
EP04020562A 2003-09-24 2004-08-30 Displacement drilling tool and method of use Not-in-force EP1519000B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10344353 2003-09-24
DE10344353A DE10344353B4 (en) 2003-09-24 2003-09-24 Drilling device and method for positive displacement drilling in the ground

Publications (2)

Publication Number Publication Date
EP1519000A1 EP1519000A1 (en) 2005-03-30
EP1519000B1 true EP1519000B1 (en) 2006-05-24

Family

ID=34177927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04020562A Not-in-force EP1519000B1 (en) 2003-09-24 2004-08-30 Displacement drilling tool and method of use

Country Status (7)

Country Link
EP (1) EP1519000B1 (en)
JP (1) JP4395037B2 (en)
CN (1) CN1320250C (en)
AT (1) ATE327406T1 (en)
DE (2) DE10344353B4 (en)
RU (1) RU2292437C2 (en)
UA (1) UA75807C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3467205A1 (en) 2017-10-06 2019-04-10 BAUER Maschinen GmbH Method for creating a pile in the ground and ground processing device for same

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Publication number Priority date Publication date Assignee Title
US9243452B2 (en) * 2011-04-22 2016-01-26 Baker Hughes Incorporated Cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and related methods
JP5859079B2 (en) * 2014-09-03 2016-02-10 有限会社清和実業 Auger screw
US9512588B2 (en) 2014-10-17 2016-12-06 Berkel & Company Contractors, Inc. Reversible displacement auger tool
US9506295B1 (en) 2014-10-17 2016-11-29 Berkel & Company Contractors, Inc. Reversible displacement auger tool
CN104878746A (en) * 2015-06-14 2015-09-02 孔超 Bidirectional extruding short spiral pile-forming device and pile-forming method
CN110685589B (en) * 2019-09-19 2020-11-24 温州博辉新材料科技有限公司 Inner wall expands puncher for municipal works of tamping

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BE903965A (en) * 1985-12-31 1986-04-16 Coelus Gaspar Jozef DEVICE AND METHOD FOR CARRYING DRILLING PILES.
DE4107834A1 (en) * 1991-03-12 1992-09-17 Delmag Maschinenfabrik Hollow displacement auger - has drive shaft extending longitudinally through its centre, with pointed tip, and has anti-buckling discs fitted at intervals along drive shaft, requiring minimum torque for control
DE4220976C1 (en) * 1992-06-26 1993-07-15 Delmag Maschinenfabrik Reinhold Dornfeld Gmbh & Co, 7300 Esslingen, De
AU1323995A (en) * 1994-01-06 1995-08-01 Roxbury Limited Improvements in or relating to apparatus for use in forming piles
BE1010638A3 (en) * 1996-09-20 1998-11-03 Poorteman Frank Drill for making a pile in the ground and method of making the drill applying.
US6033152A (en) * 1997-04-11 2000-03-07 Berkel & Company Contractors, Inc. Pile forming apparatus
FR2826050B1 (en) * 2001-06-19 2003-09-19 Cie Du Sol DRILLING AND DELIVERY TOOL

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3467205A1 (en) 2017-10-06 2019-04-10 BAUER Maschinen GmbH Method for creating a pile in the ground and ground processing device for same

Also Published As

Publication number Publication date
DE502004000614D1 (en) 2006-06-29
CN1601044A (en) 2005-03-30
CN1320250C (en) 2007-06-06
DE10344353A1 (en) 2005-05-19
RU2292437C2 (en) 2007-01-27
DE10344353B4 (en) 2005-10-06
JP4395037B2 (en) 2010-01-06
ATE327406T1 (en) 2006-06-15
RU2004127846A (en) 2006-02-20
EP1519000A1 (en) 2005-03-30
JP2005098096A (en) 2005-04-14
UA75807C2 (en) 2006-05-15

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