EP0537624B1 - Reaming tool - Google Patents

Reaming tool Download PDF

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Publication number
EP0537624B1
EP0537624B1 EP92117188A EP92117188A EP0537624B1 EP 0537624 B1 EP0537624 B1 EP 0537624B1 EP 92117188 A EP92117188 A EP 92117188A EP 92117188 A EP92117188 A EP 92117188A EP 0537624 B1 EP0537624 B1 EP 0537624B1
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EP
European Patent Office
Prior art keywords
expanding
expansion
elements
carrier shaft
head according
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EP92117188A
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German (de)
French (fr)
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EP0537624A1 (en
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FlowTex Technologie GmbH and Co KG
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Flowtex Technologie Import Von Kabelverlegemaschinen GmbH
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    • 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
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • 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
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring

Definitions

  • the invention relates to an expansion head for drilling systems for the underground laying of lines according to the preamble of patent claim 1.
  • a system lance is inserted into the ground at an angle of approximately 15 to 30 ° and, after reaching the intended laying depth, driven horizontally to a previously created assembly pit by remote control. After the system lance has reached the assembly pit, the lance is dismantled and the line to be laid is attached to the drill pipe and pulled into the hole in reverse. In this case, however, it may be necessary to expand the bore already created with the aid of an expansion head if the diameter of the lines to be drawn in exceeds the diameter of the system lance.
  • Such expanding heads are for example from the brochure "What does FlowTex mean for Germany?" known from 1986. They consist of a carrier axis with a first fastening device for the drill pipe and a second fastening device for the material to be drawn in. Holes are provided in the carrier axis through which a drilling suspension is supplied, which facilitates the loosening and removal of the earth material. Furthermore, the known expansion head consists of a basically conical expansion body attached to the carrier axis, which is provided with highly wear-resistant, abrasive bodies.
  • the known expanding heads Since the expanding heads have to be rotated at a speed between 0 and 200 revolutions per minute during the drilling process, the transmission of the rotational energy through the drill pipe is a problem. In particular when stopping the rotation, the known expanding heads can stress the drill pipe by excessive torsional forces and thereby may be permanently deformed. In addition, the known expansion heads have the problem that the removal of the drilling suspension and the removed earth materials is inadequate, as a result of which the soil can be raised above the drilling.
  • a device for expanding and drawing in a material according to the preamble of claim 1 is recognized.
  • a material such as a pipeline
  • a disk-shaped expansion element with a diameter larger than the material to be drawn in is provided. between this one expansion element and the material to be drawn in, there is a further body provided with a conical tip with abrasive elements, which has a diameter smaller than the upstream expansion element.
  • the intermediate body consists of an elongated cylinder with the described cone tip and serves to urge the additional floor material due to the expansion element to the side walls, so that the material to be drawn in behind does not have to displace the resulting floor material.
  • this known device also has the problem that when the drill pipe is braked, a large mass - here the cylindrical body and the expansion element - must be braked.
  • This technical problem is in a widening head with a carrier axis, which has a first fastening device for a drill pipe and a second fastening device for a material to be drawn in, as well as bores for the supply of a drilling suspension, an expanding body with highly wear-resistant, abrasive bodies being arranged on the carrier axis is achieved in that the expansion body consists of at least two individual, disc-like expansion elements of different diameters, which are arranged at a mutual distance from one another on the support axis, the respective diameters of the expansion elements decreasing in the direction from the second fastening device to the first fastening device.
  • the expansion head according to the invention has a significantly lower mass than the known expansion heads, since it is constructed from individual disk-like elements which are arranged at a mutual distance from one another on the carrier axis. This can, on the one hand, for a given Rotational energy can be drilled at a higher speed. On the other hand, the expansion head according to the invention causes only a slight twisting of the drill pipe when stopping.
  • At least one of the expansion elements is provided with bores for the supply of the drilling suspension.
  • the drilling suspension can be blasted from the disk-like expansion elements in any direction, in particular forwards, backwards and outwards, which facilitates the expansion of the bore and the removal of the material obtained during drilling.
  • the expansion elements are also provided with highly wear-resistant, abrasive bodies, the expansion work is carried out by both mechanical and hydraulic work.
  • At least one of the expansion elements is provided with passage openings in a region between the carrier axis and the outer circumference of the expansion element.
  • the widening element consists of an outer ring rim, which with at least three radially extending webs inner ring rim is connected, which in turn surrounds the carrier axis.
  • the mass of such an expansion head is reduced as much as possible.
  • such an expansion head has very good drilling properties, since both the drilling suspension and the drilled material mix particularly well due to the openings between the radial webs and can be removed from the borehole.
  • the expansion elements are detachably attached to the carrier axis.
  • an expansion head with a variable, i.e. adjustable outer diameter created.
  • Such an expansion head has the great advantage over the known expansion heads with a diameter that cannot be changed, that the dimensions of the expansion head can be changed by mounting expansion plates of different sizes.
  • the expansion head can be quickly adapted to the requirements with just a few simple steps.
  • the abrasive bodies are arranged on the outer ring rim of the expansion element at different radial distances.
  • Such an expansion head has particularly good drilling properties.
  • the disk-like expansion elements have a diameter of approximately 40 to 500 mm. This allows cables up to a diameter of approx. 500 mm to be drawn into the borehole.
  • the expansion head according to the invention means that the above described advantages achieved, depending on the drilling diameter, three, four or more disk-like expansion elements may be required.
  • the expanding head shown in FIG. 1 consists of a carrier axis 10 which is fastened to a drill rod 13 with a first fastening device 12.
  • the material 15 to be drawn in is fastened to the carrier axis 10 via a second fastening device 14.
  • Holes (not shown) are provided in the carrier axis 10 for the supply of a drilling suspension.
  • Four disc-like expansion elements 16 of different diameters are arranged on the support axis at a mutual axial distance.
  • the outer diameter of the expanding elements increases counter to the drilling direction, as a result of which the expanding head has a basically conical shape.
  • FIG. 2 shows an example of an expansion element 16 from the front.
  • This consists of an outer ring rim 22, which is connected to an inner ring rim 24 via three radially extending webs 26.
  • the inner ring rim 24 is provided with a rectangular center opening 25 through which the carrier axis 10 extends in the assembled state. Due to the structure described above, the carrier element 16 has three openings 20 which extend over the entire axial thickness of the Expand element 16.
  • a plurality of abrasive bodies 28 are arranged on the outer ring rim 22 both on an outer surface and on the peripheral surface, only a few of which are indicated in FIG. 2.
  • the outer diameter of the expansion elements 16 is between 40 and 500 mm.
  • the outer diameter of the expansion head can be adjusted in a few simple steps. Depending on the requirements, several expansion elements 16 of different diameters are mounted on the carrier axis 10, the minimum and the maximum outer diameter and the opening angle of the expansion head being easily adjustable by selecting the various expansion elements.
  • each expansion element 16 there are several bores 18 (FIG. 2) through which the drilling suspension can exit.
  • the bores 18 are connected to the bores (not shown) in the carrier axis 10. The choice of the size and the exit angle of the bores 18 allows the exit of the drilling suspension to be controlled in any desired manner.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Paper (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The reaming tool comprises a support spindle (10) which has a first fastening device (12) for a drill stem as well as a second fastening device (14) for a material to be drawn in, bores being provided in the support spindle for the supply of a drilling suspension. Furthermore, the reaming tool comprises a reaming body arranged on the support spindle (10) and having highly wear-resistant, abrasive members. The reaming body consists of at least two individual, disc-like reaming elements (16) of different diameter which are arranged at a mutual distance apart on the support spindle (10). <IMAGE>

Description

Die Erfindung betrifft einen Aufweitkopf für Bohrsysteme zum unterirdischen Verlegen von Leitungen nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an expansion head for drilling systems for the underground laying of lines according to the preamble of patent claim 1.

Bei derartigen Bohrsystemen wird eine Systemlanze unter einem Winkel von ca. 15 bis 30° in den Boden eingeführt und nach Erreichen der vorgesehenen Verlegetiefe waagerecht bis zu einer vorher erstellten Montagegrube ferngesteuert vorgetrieben. Nachdem die Systemlanze die Montagegrube erreicht hat, wird die Lanze demontiert und die zu verlegende Leitung wird am Bohrgestänge befestigt und im Rückwärtsgang in die Bohrung eingezogen. Hierbei kann es jedoch erforderlich sein, die bereits erstellte Bohrung mit Hilfe eines Aufweitkopfes zu erweitern, falls der Durchmesser der einzuziehenden Leitungen den Durchmesser der Systemlanze übersteigt.In drilling systems of this type, a system lance is inserted into the ground at an angle of approximately 15 to 30 ° and, after reaching the intended laying depth, driven horizontally to a previously created assembly pit by remote control. After the system lance has reached the assembly pit, the lance is dismantled and the line to be laid is attached to the drill pipe and pulled into the hole in reverse. In this case, however, it may be necessary to expand the bore already created with the aid of an expansion head if the diameter of the lines to be drawn in exceeds the diameter of the system lance.

Derartige Aufweitköpfe sind beispielsweise aus dem Prospekt "Was bedeutet FlowTex für Deutschland?" aus dem Jahr 1986 bekannt. Sie bestehen aus einer Trägerachse mit einer ersten Befestigungseinrichtung für das Bohrgestänge sowie einer zweiten Befestigungseinrichtung für das einzuziehende Material. In der Trägerachse sind Bohrungen vorgesehen, durch die eine Bohrsuspension zugeführt wird, die das Lösen und die Abfuhr des Erdmaterials erleichtert. Ferner besteht der bekannte Aufweitkopf aus einem an der Trägerachse befestigten, grundsätzlich konisch verlaufenden Aufweitkörper, der mit hochverschleißfesten, abrasiven Körpern versehen ist.Such expanding heads are for example from the brochure "What does FlowTex mean for Germany?" known from 1986. They consist of a carrier axis with a first fastening device for the drill pipe and a second fastening device for the material to be drawn in. Holes are provided in the carrier axis through which a drilling suspension is supplied, which facilitates the loosening and removal of the earth material. Furthermore, the known expansion head consists of a basically conical expansion body attached to the carrier axis, which is provided with highly wear-resistant, abrasive bodies.

Da die Aufweitköpfe beim Bohrvorgang mit einer Geschwindigkeit zwischen 0 bis 200 Umdrehungen pro Minute gedreht werden müssen, stellt die Übertragung der Rotationsenergie durch das Bohrgestänge ein Problem dar. Insbesondere beim Stoppen der Rotation kann bei den bekannten Aufweitköpfen das Bohrgestänge durch zu große Torsionskräfte beansprucht und dadurch unter Umständen bleibend verformt werden. Darüber hinaus stellt sich bei den bekannten Aufweitköpfen das Problem, daß die Abfuhr der Bohrsuspension und der abgetragenen Erdmaterialien unzureichend ist, wodurch Hebungen des Bodens oberhalb der Bohrung auftreten können.Since the expanding heads have to be rotated at a speed between 0 and 200 revolutions per minute during the drilling process, the transmission of the rotational energy through the drill pipe is a problem. In particular when stopping the rotation, the known expanding heads can stress the drill pipe by excessive torsional forces and thereby may be permanently deformed. In addition, the known expansion heads have the problem that the removal of the drilling suspension and the removed earth materials is inadequate, as a result of which the soil can be raised above the drilling.

Aus der US-A-4 402 372 ist eine Vorrichtung zum Aufweiten und Einziehen eines Materials nach dem Oberbegriff des Patentanspruchs 1 erkannt. Bei dieser bekannten Vorrichtung wird ein Material, wie eine Rohrleitung, in eine Bohrung eingezogen, wobei die bereits in der Beschreibungseinleitung dargelegten Probleme auftreten. Bei der bekannten Vorrichtung ist ein scheibenförmiges Aufweitelement mit einem Durchmesser größer als das einzuziehende Material vorgesehen. zwischen diesem einen Aufweitelement und dem einzuziehenden Material ist ein weiterer mit einer konusförmigen Spitze mit abrasiven Elementen versehener Körper angeordnet, der einen Durchmesser kleiner als das vorgeschaltete Aufweitelement aufweist. Der zwischengeschaltete Körper besteht aus einem langgestreckten Zylinder mit der beschriebenen Konusspitze und dient dazu, das durch das Aufweitelement zusätzlich anfallende Bodenmaterial an die Seitenwände zu drängen, so daß das dahintergeschaltete einzuziehende Material nicht das anfallende Bodenmaterial verdrängen muß. Jedoch besteht auch bei dieser bekannten Vorrichtung das Problem, daß beim Abbremsen des Bohrgestänges eine große Masse - hier dem zylinderförmigen Körper und dem Aufweitelement - abgebremst werden muß.From US-A-4 402 372 a device for expanding and drawing in a material according to the preamble of claim 1 is recognized. In this known device, a material, such as a pipeline, is drawn into a bore, the problems already set forth in the introduction to the description occurring. In the known device, a disk-shaped expansion element with a diameter larger than the material to be drawn in is provided. between this one expansion element and the material to be drawn in, there is a further body provided with a conical tip with abrasive elements, which has a diameter smaller than the upstream expansion element. The intermediate body consists of an elongated cylinder with the described cone tip and serves to urge the additional floor material due to the expansion element to the side walls, so that the material to be drawn in behind does not have to displace the resulting floor material. However, this known device also has the problem that when the drill pipe is braked, a large mass - here the cylindrical body and the expansion element - must be braked.

Es ist deshalb das der vorliegenden Erfindung zugrundeliegende Problem, einen Aufweitkopf zu schaffen, der bessere Rotationseigenschaften aufweist und eine verbesserte Abfuhr der abgetragenen Bodenbestandteile ermöglicht.It is therefore the problem underlying the present invention to create an expander head which has better rotational properties and enables improved removal of the removed soil components.

Dieses technische Problem (Aufgabe) wird bei einem Aufweitkopf mit einer Trägerachse, die eine erste Befestigungseinrichtung für ein Bohrgestänge sowie eine zweite Befestigungseinrichtung für ein einzuziehendes Material sowie Bohrungen für die Zufuhr einer Bohrsuspension aufweist, wobei an der Trägerachse ein Aufweitkörper mit hochverschleißfesten, abrasiven Körpern angeordnet ist, dadurch gelöst, daß der Aufweitkörper aus zumindest zwei einzelnen, scheibenartigen Aufweitelementen unterschiedlichen Durchmessers besteht, die in einem gegenseitigen Abstand an der Trägerachse angeordnet sind, wobei die jeweiligen Durchmesser der Aufweitelemente in der Richtung von der zweiten Befestigungseinrichtung nach der ersten Befestigungseinrichtung abnehmen.This technical problem (task) is in a widening head with a carrier axis, which has a first fastening device for a drill pipe and a second fastening device for a material to be drawn in, as well as bores for the supply of a drilling suspension, an expanding body with highly wear-resistant, abrasive bodies being arranged on the carrier axis is achieved in that the expansion body consists of at least two individual, disc-like expansion elements of different diameters, which are arranged at a mutual distance from one another on the support axis, the respective diameters of the expansion elements decreasing in the direction from the second fastening device to the first fastening device.

Der erfindungsgemäße Aufweitkopf besitzt gegenüber den bekannten Aufweitköpfen eine deutlich geringere Masse, da dieser aus einzelnen scheibenartigen Elementen aufgebaut ist, die in gegenseitigem Abstand an der Trägerachse angeordnet sind. Hierdurch kann einerseits bei gegebener Rotationsenergie mit einer höheren Drehzahl gebohrt werden. Andererseits bedingt der erfindungsgemäße Aufweitkopf ein nur geringes Verwinden des Bohrgestänges beim Stoppen.The expansion head according to the invention has a significantly lower mass than the known expansion heads, since it is constructed from individual disk-like elements which are arranged at a mutual distance from one another on the carrier axis. This can, on the one hand, for a given Rotational energy can be drilled at a higher speed. On the other hand, the expansion head according to the invention causes only a slight twisting of the drill pipe when stopping.

Weiterhin erfolgt durch den scheibenartigen Aufbau des Aufweitkopfes eine sehr innige Vermischung zwischen der Bohrsuspension und den abgetragenen Boden-, Stein- oder Felsbestandteilen. Diese innige Vermischung führt infolge der thixotropen Eigenschaften der Bohrsuspension zu einem besonders guten Abfluß der Suspension und des gebohrten Materials aus dem Bohrloch. Hierdurch werden Bodenhebungen oberhalb der Bohrung vermieden, was insbesondere bei größeren Bohrdurchmessern von großer Bedeutung ist.Furthermore, due to the disc-like structure of the expansion head, there is a very intimate mixing between the drilling suspension and the removed soil, stone or rock components. Due to the thixotropic properties of the drilling suspension, this intimate mixing leads to a particularly good outflow of the suspension and the drilled material from the borehole. In this way, floor elevations above the bore are avoided, which is particularly important for larger bore diameters.

Nach einer vorteilhaften Ausführungsform der Erfindung ist zumindest eines der Aufweitelemente mit Bohrungen für die Zufuhr der Bohrsuspension versehen. Hierdurch kann die Bohrsuspension aus den scheibenartigen Aufweitelementen in jeder beliebigen Richtung, insbesondere nach vorn, hinten und außen gestrahlt werden, was das Aufweiten der Bohrung und den Abtransport des beim Bohren anfallenden Materials erleichtert. Da die Aufweitelemente zudem mit hochverschleißfesten, abrasiven Körpern versehen sind, wird die Aufweitarbeit sowohl durch mechanische als auch durch hydraulische Arbeit geleistet.According to an advantageous embodiment of the invention, at least one of the expansion elements is provided with bores for the supply of the drilling suspension. As a result, the drilling suspension can be blasted from the disk-like expansion elements in any direction, in particular forwards, backwards and outwards, which facilitates the expansion of the bore and the removal of the material obtained during drilling. Since the expansion elements are also provided with highly wear-resistant, abrasive bodies, the expansion work is carried out by both mechanical and hydraulic work.

Nach einer weiteren Ausbildung der Erfindung ist zumindest eines der Aufweitelemente in einem Bereich zwischen der Trägerachse und dem Außenumfang des Aufweitelementes mit Durchlaßöffnungen versehen. Hierdurch wird die zu rotierende Masse des Aufweitkopfes noch weiter verringert, was sowohl die Rotationseigenschaften des Aufweitkopfes verbessert wie auch zu einer besseren Vermischung zwischen Bohrsuspension und abgetragenem Material führt.According to a further embodiment of the invention, at least one of the expansion elements is provided with passage openings in a region between the carrier axis and the outer circumference of the expansion element. As a result, the mass of the expander head to be rotated is further reduced, which both improves the rotational properties of the expander head and also leads to better mixing between the drilling suspension and the removed material.

Nach einer weiteren vorteilhaften Lösung der Erfindung besteht das Aufweitelement aus einem äußeren Ringkranz, der über mindestens drei radial verlaufende Stege mit einem inneren Ringkranz verbunden ist, welcher wiederum die Trägerachse umgibt. Die Masse eines derartigen Aufweitkopfes ist einerseits bestmöglich verringert. Andererseits besitzt ein derartiger Aufweitkopf sehr gute Bohreigenschaften, da sowohl die Bohrsuspension wie auch das gebohrte Material sich aufgrund der Öffnungen zwischen den radial verlaufenden Stegen besonders gut vermischt und aus dem Bohrloch entfernt werden kann.According to a further advantageous solution of the invention, the widening element consists of an outer ring rim, which with at least three radially extending webs inner ring rim is connected, which in turn surrounds the carrier axis. The mass of such an expansion head is reduced as much as possible. On the other hand, such an expansion head has very good drilling properties, since both the drilling suspension and the drilled material mix particularly well due to the openings between the radial webs and can be removed from the borehole.

Nach einer besonders vorteilhaften Ausführungsform der Erfindung sind die Aufweitelemente lösbar an der Trägerachse befestigt. Hierdurch ist bei Verwendung verschiedener Aufweitelemente unterschiedlichen Durchmessers ein Aufweitkopf mit variablem, d.h. einstellbarem Außendurchmesser geschaffen. Ein derartiger Aufweitkopf besitzt gegenüber den bekannten Aufweitköpfen mit nicht veränderbarem Durchmesser den großen Vorteil, daß durch die Montage unterschiedlich großer Aufweitscheiben die Abmessungen des Aufweitkopfes veränderbar sind. Hierbei kann die Anpassung des Aufweitkopfes an die Anforderungen schnell mit Hilfe weniger Handgriffe erfolgen.According to a particularly advantageous embodiment of the invention, the expansion elements are detachably attached to the carrier axis. As a result, when using different expansion elements of different diameters, an expansion head with a variable, i.e. adjustable outer diameter created. Such an expansion head has the great advantage over the known expansion heads with a diameter that cannot be changed, that the dimensions of the expansion head can be changed by mounting expansion plates of different sizes. The expansion head can be quickly adapted to the requirements with just a few simple steps.

Nach einer weiteren Ausbildung der Erfindung sind die abrasiven Körper an dem äußeren Ringkranz des Aufweitelementes in unterschiedlichem radialen Abstand angeordnet. Ein derartiger Aufweitkopf weist besonders gute Bohreigenschaften auf.According to a further embodiment of the invention, the abrasive bodies are arranged on the outer ring rim of the expansion element at different radial distances. Such an expansion head has particularly good drilling properties.

Nach einer vorteilhaften Ausführungsform der Erfindung weisen die scheibenartigen Aufweitelemente einen Durchmesser von ca. 40 bis 500 mm auf. Hierdurch können Leitungen bis zu einem Durchmesser von ca. 500 mm in das Bohrloch eingezogen werden. Insbesondere bei derartig großen Bohrdurchmessern werden durch den erfindungsgemäßen Aufweitkopf die oben geschilderten Vorteile erzielt, wobei je nach Bohrdurchmesser auch drei, vier oder mehr scheibenartige Aufweitelemente erforderlich sein können.According to an advantageous embodiment of the invention, the disk-like expansion elements have a diameter of approximately 40 to 500 mm. This allows cables up to a diameter of approx. 500 mm to be drawn into the borehole. In particular with such large drilling diameters, the expansion head according to the invention means that the above described advantages achieved, depending on the drilling diameter, three, four or more disk-like expansion elements may be required.

Ein Ausführungsbeispiel der vorliegenden Erfindung wird anhand der beigefügten Zeichnungen beispielhaft beschrieben. Es zeigen

Fig. 1
eine Seitenansicht eines erfindungsgemäßen Aufweitkopfes in einem Bohrloch; und
Fig. 2
eine Vorderansicht eines erfindungsgemäßen Aufweitelementes.
An embodiment of the present invention is described by way of example with reference to the accompanying drawings. Show it
Fig. 1
a side view of an expanding head according to the invention in a borehole; and
Fig. 2
a front view of an expansion element according to the invention.

Der in Fig. 1 gezeigte Aufweitkopf besteht aus einer Trägerachse 10, die mit einer ersten Befestigungseinrichtung 12 an einem Bohrgestänge 13 befestigt ist. Das einzuziehende Material 15 ist über eine zweite Befestigungseinrichtung 14 an der Trägerachse 10 befestigt. In der Trägerachse 10 sind nicht dargestellte Bohrungen für die Zufuhr einer Bohrsuspension vorgesehen. An der Trägerachse sind in gegenseitigem axialen Abstand vier scheibenartige Aufweitelemente 16 unterschiedlichen Durchmessers angeordnet. Hierbei nimmt der Außendurchmesser der Aufweitelemente entgegen der Bohrrichtung zu, wodurch der Aufweitkopf eine grundsätzlich konische Form aufweist.The expanding head shown in FIG. 1 consists of a carrier axis 10 which is fastened to a drill rod 13 with a first fastening device 12. The material 15 to be drawn in is fastened to the carrier axis 10 via a second fastening device 14. Holes (not shown) are provided in the carrier axis 10 for the supply of a drilling suspension. Four disc-like expansion elements 16 of different diameters are arranged on the support axis at a mutual axial distance. Here, the outer diameter of the expanding elements increases counter to the drilling direction, as a result of which the expanding head has a basically conical shape.

Fig. 2 zeigt beispielhaft ein Aufweitelement 16 von vorne. Dieses besteht aus einem äußeren Ringkranz 22, der über drei radial verlaufende Stege 26 mit einem inneren Ringkranz 24 verbunden ist. Der innere Ringkranz 24 ist mit einer rechteckigen Zentrumsöffnung 25 versehen, durch die sich in montiertem Zustand die Trägerachse 10 erstreckt. Durch den oben beschriebenen Aufbau weist das Trägerelement 16 drei Öffnungen 20 auf, die sich über die gesamte axiale Dicke des Aufweitelementes 16 erstrecken. Am äußeren Ringkranz 22 sind sowohl auf einer Außenfläche wie auch auf der Umfangsfläche mehrere abrasive Körper 28 angeordnet, von denen in Fig. 2 nur einige angedeutet sind. Der Außendurchmesser der Aufweitelemente 16 beträgt zwischen 40 und 500 mm.2 shows an example of an expansion element 16 from the front. This consists of an outer ring rim 22, which is connected to an inner ring rim 24 via three radially extending webs 26. The inner ring rim 24 is provided with a rectangular center opening 25 through which the carrier axis 10 extends in the assembled state. Due to the structure described above, the carrier element 16 has three openings 20 which extend over the entire axial thickness of the Expand element 16. A plurality of abrasive bodies 28 are arranged on the outer ring rim 22 both on an outer surface and on the peripheral surface, only a few of which are indicated in FIG. 2. The outer diameter of the expansion elements 16 is between 40 and 500 mm.

Da die Aufweitelemente 16 lösbar an der Trägerachse 10 angeordnet sind, läßt sich der Außendurchmesser des Aufweitkopfes mit wenigen Handgriffen einstellen. Hierbei werden je nach Anforderung mehrere Aufweitelemente 16 unterschiedlichen Durchmessers an der Trägerachse 10 montiert, wobei sich der minimale und der maximale Außendurchmesser sowie der Öffnungswinkel des Aufweitkopfes durch die Auswahl der verschiedenen Aufweitelemente leicht einstellen lassen.Since the expansion elements 16 are detachably arranged on the carrier axis 10, the outer diameter of the expansion head can be adjusted in a few simple steps. Depending on the requirements, several expansion elements 16 of different diameters are mounted on the carrier axis 10, the minimum and the maximum outer diameter and the opening angle of the expansion head being easily adjustable by selecting the various expansion elements.

In jedem Aufweitelement 16 befinden sich mehrere Bohrungen 18 (Fig. 2), durch welche die Bohrsuspension austreten kann. Hierbei stehen die Bohrungen 18 mit den (nicht gezeigten) Bohrungen in der Trägerachse 10 in Verbindung. Durch die Wahl der Größe und des Austrittswinkels der Bohrungen 18 läßt sich der Austritt der Bohrsuspension in jeder gewünschten Weise steuern.In each expansion element 16 there are several bores 18 (FIG. 2) through which the drilling suspension can exit. The bores 18 are connected to the bores (not shown) in the carrier axis 10. The choice of the size and the exit angle of the bores 18 allows the exit of the drilling suspension to be controlled in any desired manner.

Bei dem in den Fig. 1 und 2 gezeigten Aufweitkopf erfolgt eine besonders innige Vermischung zwischen Bohrsuspension und abgetragenen Boden-, Stein- oder Felsbestandteilen. Aufgrund der Konstruktion des Aufweitkopfes kann die Flüssigkeit gut aus dem Bohrloch abfließen, wodurch Hebungen des Bodens oberhalb der Bohrung ausgeschlossen sind.In the expansion head shown in FIGS. 1 and 2, there is a particularly intimate mixing between drilling suspension and removed soil, stone or rock components. Due to the construction of the expansion head, the liquid can flow out of the borehole, which means that there is no lifting of the soil above the borehole.

Claims (7)

  1. Expanding head with
    - a carrier shaft (10) comprising a first fixing device (12) for a drill string as well as a second fixing device (14) for equipment to be pulled in; wherein
    - bores are provided in the carrier shaft (10) for the supply of a drilling suspension; and
    - with an expanding body with highly wear-resistant
       abrasive bodies, arranged on the carrier shaft (10), characterised in that the expanding body consists of at least two individual disc-like expanding elements (16) of different diameter which are arranged at a mutual distance on the carrier shaft (10), wherein the respective diameters of the expanding elements (16) decrease in the direction from the second fixing device (14) to the first fixing device (12).
  2. Expanding head according to claim 1, characterised in that at least one of the expanding elements (16) is provided with bores (18) for supply of the drilling suspension.
  3. Expanding head according to claim 1, characterised in that at least one of the expanding elements (16) in a region between the carrier shaft and the outer circumference of the expanding element is provided with several openings (20).
  4. Expanding head according to claim 3, characterised in that the expanding element consists of an outer ring (22) which is connected by at least three radially extending webs (26) to an inner ring (24) which surrounds the carrier shaft (10).
  5. Expanding head according to claim 1, characterised in that the expanding elements (16) are releasably attached to the carrier shaft (10).
  6. Expanding head according to claim 4, characterised in that the abrasive bodies are arranged on the outer ring of the expanding element at different radial distances.
  7. Expanding head according to claim 1, characterised in that the disc-like expanding elements (16) have a diameter of about 40 to 500 mm.
EP92117188A 1991-10-15 1992-10-08 Reaming tool Expired - Lifetime EP0537624B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4134095 1991-10-15
DE4134095A DE4134095C1 (en) 1991-10-15 1991-10-15

Publications (2)

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EP0537624A1 EP0537624A1 (en) 1993-04-21
EP0537624B1 true EP0537624B1 (en) 1996-02-21

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ID=6442718

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Application Number Title Priority Date Filing Date
EP92117188A Expired - Lifetime EP0537624B1 (en) 1991-10-15 1992-10-08 Reaming tool

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EP (1) EP0537624B1 (en)
AT (1) ATE134416T1 (en)
DE (1) DE4134095C1 (en)
DK (1) DK0537624T3 (en)
ES (1) ES2086042T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4220430C2 (en) * 1992-06-24 1994-09-22 Tracto Technik Method and device for making an earth borehole
DE4403040C2 (en) * 1994-01-28 1997-09-11 Schwarzloh Hans Peter Expanding head for expanding a pilot hole in the loose rock area
EP0718461A3 (en) * 1994-12-19 1998-04-29 FLOWTEX TECHNOLOGIE-IMPORT VON KABELVERLEGEMASCHINEN GmbH Method and apparatus for laying a conduit in a stop-type trench arrangement
DE19523769C1 (en) * 1994-12-19 1996-08-08 Flowtex Technologie Import Von Device and method for laying cables in a trench-like arrangement
AT1296U1 (en) * 1995-12-22 1997-02-25 Rabmer Josef METHOD AND DEVICE FOR LAYING PIPELINES WITHOUT CURLING
DE19718527C2 (en) * 1997-05-02 2002-10-17 Tracto Technik Device for expanding an earth borehole
DE10144973B4 (en) * 2001-09-12 2004-02-05 Tracto-Technik Gmbh Wing remover, method of drilling with a wing remover and its use

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1701427A (en) * 1927-02-23 1929-02-05 Bert Russell Rotary drilling and reaming tool organization
FR1427180A (en) * 1964-12-22 1966-02-04 Lorraine Houilleres Boring method and device allowing its implementation
US3967689A (en) * 1974-09-25 1976-07-06 Tidril Corporation Reaming apparatus
US4402372A (en) * 1979-09-24 1983-09-06 Reading & Bates Construction Co. Apparatus for drilling underground arcuate paths and installing production casings, conduits, or flow pipes therein

Also Published As

Publication number Publication date
ES2086042T3 (en) 1996-06-16
ATE134416T1 (en) 1996-03-15
EP0537624A1 (en) 1993-04-21
DE4134095C1 (en) 1992-07-16
DK0537624T3 (en) 1996-07-08

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