EP0612912A1 - Earth drilling device - Google Patents

Earth drilling device Download PDF

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Publication number
EP0612912A1
EP0612912A1 EP94102651A EP94102651A EP0612912A1 EP 0612912 A1 EP0612912 A1 EP 0612912A1 EP 94102651 A EP94102651 A EP 94102651A EP 94102651 A EP94102651 A EP 94102651A EP 0612912 A1 EP0612912 A1 EP 0612912A1
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EP
European Patent Office
Prior art keywords
drill head
nozzle
boring machine
machine according
axis
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.)
Granted
Application number
EP94102651A
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German (de)
French (fr)
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EP0612912B1 (en
Inventor
Dietmar Dipl.-Wi.-Ing. Jenne
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Terra AG fuer Tiefbautechnik
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Terra AG fuer Tiefbautechnik
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Publication of EP0612912A1 publication Critical patent/EP0612912A1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/065—Deflecting the direction of boreholes using oriented fluid jets

Definitions

  • the invention relates to an earth drilling device with a drill head rotatable about its axis, which has a control surface inclined to the head axis for its directional control and on which a nozzle is provided for the discharge of a drilling fluid.
  • a drill head of this type is known, for example, from US Pat. No. 4,953,638.
  • the drill head described there is attached to a drill pipe with which the drill head can be driven in a rotating and pushing manner.
  • the drill head has a substantially wedge shape.
  • a drill blade is attached to one of the wedge surfaces, while the nozzle is arranged on the other wedge surface, the jet direction of which is at a slight angle with respect to the direction of advance, ie the drill head axis is inclined so that the nozzle points approximately in the forward direction.
  • the drill head must be turned during straight running. For a change in direction, the drill head is brought into a position in which the wedge surface carrying the drill blade points towards the side opposite to the desired deflection direction.
  • the drill head is then driven statically through the drill pipe. It deflects in the desired deflection direction due to the flat side of the drill blade serving as the control surface.
  • the drilling fluid emerging from the nozzle serves to support the drilling action, ie to cool the drilling blade and to wash
  • the drilling fluid loosens the soil in front of the drill head in a cone that is relatively narrow around the drilling axis. This reduces the resistance of the soil in the direction of advance, while on the other hand the soil around the drill head remains firm. This makes it difficult to actually deflect the drill head in the desired direction with a predetermined radius corresponding to the inclination of the control surface. In addition, there is a risk that the nozzle will become blocked as long as drilling is carried out for a short time without drilling fluid.
  • the invention has for its object to design the drill head of an above-mentioned earth drilling device so that it can be deflected precisely and with a relatively narrow radius.
  • the nozzle is arranged on the axially parallel side of the drill head facing away from the control surface.
  • Several nozzles can also be provided.
  • the nozzles can be directed substantially perpendicular to the drill head axis or also inclined at a certain angle to the drill head axis in the forward direction.
  • the soil is loosened by the drilling fluid flowing out, not immediately in front of the drill head, but laterally by the drill head.
  • the soil remains firm at the point where the control surface is to be supported when the drill head is deflected, while the soil is loosened in the direction in which the drill head is to be deflected.
  • the supply of the drilling fluid to the nozzle or the nozzles can be switched off during the straight approach without the danger of the nozzles becoming blocked , since they are arranged on a side surface of the drill head which is oriented parallel to the drill head axis.
  • the drilling head according to the invention can be used both for an earth drilling device with static propulsion and for an earth drilling device with dynamic impact propulsion, that is to say a ram drilling device.
  • FIG. 1 shows the drilling device according to the invention, which in a manner known per se comprises a propulsion unit 10 and a drill pipe 12, at the front end of which a drilling head 14 is arranged.
  • the propulsion unit 10 is constructed in a conventional manner and serves to rotate and statically propel the drill pipe 12 and to convey the drilling fluid through the drill pipe 12 to the drill head 14.
  • the propulsion unit 10 can be constructed, for example, as described in US Pat. No. 4,953,638 or comprise a correspondingly constructed drilling carriage which is self-propelled by a rubber crawler track.
  • the drilling head 14 has a substantially cylindrical shape and has a control surface 18 directed at an angle to its axis 16 at its front end.
  • the nozzles are arranged and designed so that the jet direction of the nozzles indicated by the arrows 22 is directed essentially perpendicular to the axis 16.
  • the nozzles 22 are designed and arranged so that the jet direction indicated by the arrows 22 are inclined in the forward direction at an angle different from 90 ° to the axis 16.
  • the nozzles can be arranged in an axially parallel row with equal or unequal spacing over the length of the drill head. It is essential that the distance of the nozzles from the drill head tip and the jet direction of the nozzles are selected so that essentially only the soil to the side of the drill head and not the soil immediately in front of the drill head tip is softened or washed away.
  • the drill head 14 is rotated so that the drill head behaves like a rotationally symmetrical drill head.
  • No drilling fluid needs to be blasted through the nozzles 20 into the ground during straight running.
  • a supply of drilling fluid can be expedient in order to increase the lubricity of the drill head.
  • the drill head is brought into the position shown, in which control surface 18 points to the side opposite arrow 24. In this position, drilling fluid is pumped through the nozzles 20 into the adjacent soil and the soil is loosened in this way. Static propulsion of the drilling head 14 then deflects it in the direction of the arrow 24, with the drilling fluid expediently also continuing to be emitted through the nozzles 20.
  • the part of the soil on which the control surface 18 is to be supported remains dry and solid.
  • the soil is loosened laterally by the drill head in the direction of deflection, so that the boring head can easily dodge in this direction. This allows small deflection radii to be achieved, so that a relatively sensitive control is obtained.
  • the drill head can also be easily connected to a conventional piling device without changing its function.

Abstract

In an earth drilling device with a drill head (14) which is rotatable about its axis (16) and has for its directional control a control surface (18) inclined relative to the axis (16) and on which at least one nozzle (20) for the discharge of a pressurised drilling fluid is provided, the nozzle opening being arranged on the axially parallel side of the drill head (14) remote from the control surface (18), the axial distance of the nozzle from the tip of the drill head and its jet direction are selected in such a way that, when the drill head is being used, the jet discharging from the nozzle essentially reaches only the earth located at the side of the drill head. <IMAGE>

Description

Die Erfindung betrifft ein Erdbohrgerät mit einem um seine Achse drehbaren Bohrkopf, der zu seiner Richtungssteuerung eine zur Kopfachse geneigte Steuerfläche hat und an dem eine Düse zum Austritt einer Bohrflüssigkeit vorgesehen ist.The invention relates to an earth drilling device with a drill head rotatable about its axis, which has a control surface inclined to the head axis for its directional control and on which a nozzle is provided for the discharge of a drilling fluid.

Ein Bohrkopf dieser Art ist beispielsweise aus der US-PS 4,953,638 bekannt. Der dort beschriebene Bohrkopf ist an einem Bohrgestänge befestigt, mit dem der Bohrkopf drehend und drückend vorgetrieben werden kann. Der Bohrkopf hat eine im wesentlichen keilförmige Form. An einer der Keilflächen ist eine Bohrklinge befestigt, während an der anderen Keilfläche die Düse angeordnet ist, deren Strahlrichtung unter einem geringen Winkel gegenüber der Vortriebsrichtung, d.h. der Bohrkopfachse geneigt ist, so daß die Düse annähernd in Vorwärtsrichtung zeigt. Während des Geradeauslaufes muß der Bohrkopf gedreht werden. Für eine Richtungsänderung wird der Bohrkopf in eine Stellung gebracht, in welcher die die Bohrklinge tragende Keilfläche nach der der gewünschten Ablenkrichtung entgegengesetzten Seite weist. Anschließend wird der Bohrkopf statisch durch das Bohrgestänge vorgetrieben. Er weicht dabei aufgrund der als Steuerfläche dienenden Flachseite der Bohrklinge in die gewünschte Ablenkrichtung aus. Die aus der Düse austretende Bohrflüssigkeit dient dazu, die Bohrwirkung zu unterstützen, d.h. die Bohrklinge zu kühlen und das von der Bohrklinge ausgeschnitte Erdreich wegzuspülen.A drill head of this type is known, for example, from US Pat. No. 4,953,638. The drill head described there is attached to a drill pipe with which the drill head can be driven in a rotating and pushing manner. The drill head has a substantially wedge shape. A drill blade is attached to one of the wedge surfaces, while the nozzle is arranged on the other wedge surface, the jet direction of which is at a slight angle with respect to the direction of advance, ie the drill head axis is inclined so that the nozzle points approximately in the forward direction. The drill head must be turned during straight running. For a change in direction, the drill head is brought into a position in which the wedge surface carrying the drill blade points towards the side opposite to the desired deflection direction. The drill head is then driven statically through the drill pipe. It deflects in the desired deflection direction due to the flat side of the drill blade serving as the control surface. The drilling fluid emerging from the nozzle serves to support the drilling action, ie to cool the drilling blade and to wash away the soil cut out from the drilling blade.

Bei der Drehung des Bohrkopfes lockert die Bohrflüssigkeit das vor dem Bohrkopf liegende Erdreich in einem relativ eng um die Bohrachse liegenden Kegel auf. Dadurch vermindert sich der Widerstand des Erdreiches in Vortriebsrichtung, während andererseits das um den Bohrkopf herum befindliche Erdreich fest bleibt. Dadurch ist es schwierig, den Bohrkopf tatsächlich mit einem vorgegebenen, der Neigung der Steuerfläche entsprechenden Radius in die gewünschte Richtung abzulenken. Zudem besteht die Gefahr, daß die Düse verstopft, sofern auch nur kurzzeitig ohne Bohrflüssigkeit gebohrt wird.As the drill head rotates, the drilling fluid loosens the soil in front of the drill head in a cone that is relatively narrow around the drilling axis. This reduces the resistance of the soil in the direction of advance, while on the other hand the soil around the drill head remains firm. This makes it difficult to actually deflect the drill head in the desired direction with a predetermined radius corresponding to the inclination of the control surface. In addition, there is a risk that the nozzle will become blocked as long as drilling is carried out for a short time without drilling fluid.

Der Erfindung liegt die Aufgabe zugrunde, dem Bohrkopf eines eingangs genannten Erdbohrgerätes so auszubilden, daß er präzise und mit einem relativ engen Radius abgelenkt werden kann.The invention has for its object to design the drill head of an above-mentioned earth drilling device so that it can be deflected precisely and with a relatively narrow radius.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Düse auf der der Steuerfläche abgewandten achsparallelen Seite des Bohrkopfes angeordnet ist. Es können auch mehrere Düsen vorgesehen sein. Die Düsen können im wesentlichen senkrecht zur Bohrkopfachse gerichtet oder auch unter einem gewissen Winkel zum Bohrkopfachse in Vorwärtsrichtung geneigt sein.This object is achieved in that the nozzle is arranged on the axially parallel side of the drill head facing away from the control surface. Several nozzles can also be provided. The nozzles can be directed substantially perpendicular to the drill head axis or also inclined at a certain angle to the drill head axis in the forward direction.

Durch die erfindungsgemäße Anordnung der Düse oder der Düsen an dem Bohrkopf wird durch die ausströmende Bohrflüssigkeit das Erdreich nicht unmittelbar vor dem Bohrkopf, sondern seitlich von dem Bohrkopf aufgelockert. Dadurch bleibt das Erdreich an der Stelle, an der sich die Steuerfläche bei dem Ablenken des Bohrkopfes abstützen soll, fest, während das Erdreich in der Richtung, in die der Bohrkopf abgelenkt werden soll, aufgelockert wird. Um zu vermeiden, daß das Erdreich bei der Drehung des Bohrkopfes während des Geradeauslaufes ringsherum aufgelockert wird, kann bei der erfindungsgemäßen Lösung die Zuführung der Bohrflüssigkeit zu der Düse oder den Düsen während des Geradeauflaufes abgestellt werden, ohne daß die Gefahr besteht, daß die Düsen verstopfen, da sie an einer parallel zur Bohrkopfachse gerichteten Seitenfläche des Bohrkopfes angeordnet sind.As a result of the arrangement according to the invention of the nozzle or nozzles on the drill head, the soil is loosened by the drilling fluid flowing out, not immediately in front of the drill head, but laterally by the drill head. As a result, the soil remains firm at the point where the control surface is to be supported when the drill head is deflected, while the soil is loosened in the direction in which the drill head is to be deflected. In order to avoid that the soil is loosened all around during the rotation of the drill head during straight running, in the solution according to the invention the supply of the drilling fluid to the nozzle or the nozzles can be switched off during the straight approach without the danger of the nozzles becoming blocked , since they are arranged on a side surface of the drill head which is oriented parallel to the drill head axis.

Der erfindungsgemäße Bohrkopf kann sowohl für ein Erdbohrgerät mit statischem Vortrieb als auch für ein Erdbohrgerät mit dynamisch schlagendem Vortrieb, also ein Rammbohrgerät verwendet werden.The drilling head according to the invention can be used both for an earth drilling device with static propulsion and for an earth drilling device with dynamic impact propulsion, that is to say a ram drilling device.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung, welche in Verbindung mit den beigefügten Zeichnungen die Erfindung anhand von Ausführungsbeispielen erläutert. Es zeigen:

Figur 1
eine schematische Darstellung eines Erdbohrgerätes,
Figur 2
eine schematische Seitenansicht eines Bohrkopfes gemäß einer ersten Ausführungsform der Erfindung und
Figur 3
eine der Figur 2 entsprechende Darstellung eines Bohrkopfes gemäß einer zweiten Ausführungsform der Erfindung.
Further features and advantages of the invention will become apparent from the following description, which explains the invention with reference to exemplary embodiments in conjunction with the accompanying drawings. Show it:
Figure 1
a schematic representation of an earth drilling device,
Figure 2
is a schematic side view of a drill head according to a first embodiment of the invention and
Figure 3
a representation corresponding to Figure 2 of a drill head according to a second embodiment of the invention.

Figur 1 zeigt das erfindungsgemäße Bohrgerät, das in an sich bekannter Weise eine Vortriebseinheit 10 und ein Bohrgestänge 12 umfaßt, an dessen vorderem Ende ein Bohrkopf 14 angeordnet ist. Die Vortriebseinheit 10 ist in herkömmlicher Weise aufgebaut und dient dazu, daß Bohrgestänge 12 zu drehen und statisch vorzutreiben sowie die Bohrflüssigkeit durch das Bohrgestänge 12 zum Bohrkopf 14 zu fördern. Die Vortriebseinheit 10 kann beispielsweise so aufgebaut sein, wie dies in der US-PS 4,953,638 beschrieben ist oder einen entsprechend aufgebauten Bohrwagen umfassen, der durch ein Gummiraupenfahrwerk selbstfahrend ist.FIG. 1 shows the drilling device according to the invention, which in a manner known per se comprises a propulsion unit 10 and a drill pipe 12, at the front end of which a drilling head 14 is arranged. The propulsion unit 10 is constructed in a conventional manner and serves to rotate and statically propel the drill pipe 12 and to convey the drilling fluid through the drill pipe 12 to the drill head 14. The propulsion unit 10 can be constructed, for example, as described in US Pat. No. 4,953,638 or comprise a correspondingly constructed drilling carriage which is self-propelled by a rubber crawler track.

Der Bohrkopf 14 hat eine im wesentlichen zylindrische Gestalt und weist an seinem vorderen Ende eine schräg zu seiner Achse 16 gerichtete Steuerfläche 18 auf. Auf der der Steuerfläche 18 entgegengesetzten, parallel zur Achse 16 gerichteten Seite sind eine oder mehrere Düsen 20 angeordnet, durch die über eine nicht dargestellte Zuleitung Bohrflüssigkeit unter Druck austreten kann. Die Düsen sind dabei so angeordnet und ausgebildet, daß die durch die Pfeile 22 angedeutete Strahlrichtung der Düsen im wesentlichen senkrecht zur Achse 16 gerichtet ist. Bei der in Figur 3 dargestellten Ausführungsform sind die Düsen 22 so ausgebildet und angeordnet, daß die durch die Pfeile 22 angegebene Strahlrichtung unter einem von 90° verschiedenen Winkel zur Achse 16 in Vorwärtsrichtung geneigt sind. Die Düsen können in einer achsparallelen Reihe mit gleichen oder ungleichen Abständen über die Länge des Bohrkopfes verteilt angeordnet sein. Wesentlich ist dabei, daß der Abstand der Düsen von der Bohrkopfspitze und die Strahlrichtung der Düsen so gewählt werden, daß im wesentlichen nur das Erdreich seitlich vom Bohrkopf und nicht das unmittelbar vor der Bohrkopfspitze gelegene Erdreich aufgeweicht oder weggespült wird.The drilling head 14 has a substantially cylindrical shape and has a control surface 18 directed at an angle to its axis 16 at its front end. On the opposite side of the control surface 18, parallel to the axis 16, one or more nozzles 20 are arranged, through which drilling fluid can escape under pressure via a feed line, not shown. The nozzles are arranged and designed so that the jet direction of the nozzles indicated by the arrows 22 is directed essentially perpendicular to the axis 16. In the embodiment shown in Figure 3, the nozzles 22 are designed and arranged so that the jet direction indicated by the arrows 22 are inclined in the forward direction at an angle different from 90 ° to the axis 16. The nozzles can be arranged in an axially parallel row with equal or unequal spacing over the length of the drill head. It is essential that the distance of the nozzles from the drill head tip and the jet direction of the nozzles are selected so that essentially only the soil to the side of the drill head and not the soil immediately in front of the drill head tip is softened or washed away.

Während des Geradeauslaufes wird der Bohrkopf 14 gedreht, so daß sich der Bohrkopf wie ein rotationssymmetrisch ausgebildeter Bohrkopf verhält. Während des Geradeauslaufs braucht dabei keine Bohrflüssigkeit durch die Düsen 20 ins Erdreich abgestrahlt zu werden. Eine Zufuhr von Bohrflüssigkeit kann jedoch zweckmäßig sein, um die Gleitfähigkeit des Bohrkopfes zu erhöhen.During straight running, the drill head 14 is rotated so that the drill head behaves like a rotationally symmetrical drill head. No drilling fluid needs to be blasted through the nozzles 20 into the ground during straight running. However, a supply of drilling fluid can be expedient in order to increase the lubricity of the drill head.

Soll die Vortriebsrichtung beispielsweise in Richtung des Pfeiles 24 in Figur 2 geändert werden, so wird der Bohrkopf in die dargestellte Stellung gebracht, in welcher die Steuerfläche 18 nach der dem Pfeil 24 entgegengesetzten Seite weist. In dieser Stellung wird Bohrflüssigkeit durch die Düsen 20 in das benachbarte Erdreich gepumpt und das Erdreich auf diese Weise aufgelockert. Durch statischen Vortrieb des Bohrkopfes 14 wird dieser anschließend in Richtung des Pfeiles 24 abgelenkt, wobei zweckmäßigerweise auch weiterhin Bohrflüssigkeit durch die Düsen 20 abgestrahlt wird.If the direction of advance is to be changed, for example, in the direction of arrow 24 in FIG. 2, the drill head is brought into the position shown, in which control surface 18 points to the side opposite arrow 24. In this position, drilling fluid is pumped through the nozzles 20 into the adjacent soil and the soil is loosened in this way. Static propulsion of the drilling head 14 then deflects it in the direction of the arrow 24, with the drilling fluid expediently also continuing to be emitted through the nozzles 20.

Wie man erkennt, bleibt der Teil des Erdreiches trocken und fest, an dem sich die Steuerfläche 18 abstützen soll. Dagegen wird das Erdreich seitlich von dem Bohrkopf in Ablenkungsrichtung aufgelockert, so daß der Bohkopf nach dieser Richtung leicht ausweichen kann. Dadurch lassen sich kleine Ablenkungsradien erzielen, so daß man eine relativ empfindliche Steuerung erhält.As can be seen, the part of the soil on which the control surface 18 is to be supported remains dry and solid. In contrast, the soil is loosened laterally by the drill head in the direction of deflection, so that the boring head can easily dodge in this direction. This allows small deflection radii to be achieved, so that a relatively sensitive control is obtained.

Dadurch daß die Düsen an der im wesentlichen parallel zur Achse 16 verlaufenden Seitenwand des Bohrkopfes ausgebildet sind, besteht keine Gefahr, daß die Düsen beim Vortrieb ohne Austritt von Bohrflüssigkeit verstopfen. Zumindest wird beim Vortrieb des Bohrkopfes das Erdreich nicht unmittelbar in die Düsenöffnung eingetrieben, so daß die Düsenöffnungen leicht freigespült werden können.As a result of the nozzles being formed on the side wall of the drill head which runs essentially parallel to the axis 16, there is no danger that the nozzles will become blocked during the advance without any drilling fluid escaping. At least when driving the drill head, the soil is not driven directly into the nozzle opening, so that the nozzle openings can be easily flushed out.

Der Bohrkopf kann auch ohne weiteres mit einem herkömmlichen Rammgerät verbunden werden, ohne daß sich an seiner Funktion etwas ändert.The drill head can also be easily connected to a conventional piling device without changing its function.

Claims (8)

Erdbohrgerät mit einem um seine Achse (16) drehbaren Bohrkopf (14), der zu seiner Richtungssteuerung eine zur Achse (16) geneigte Steuerfläche (18) hat und an dem mindestens eine Düse (20) zum Austritt einer unter Druck stehende Bohrflüssigkeit vorgesehen ist, wobei die Düsenöffnung auf der der Steuerfläche (18) abgewandten achsparallelen Seite des Bohrkopfes (14) angeordnet ist, dadurch gekennzeichnet, daß der axiale Abstand der Düse von der Bohrkopfspitze und ihre Strahlrichtung so gewählt sind, daß beim Einsatz des Bohrkopfes der aus der Düse austretende Strahl im wesentlichen nur das seitlich des Bohrkopfes gelegene Erdreich erreicht.Earth drilling device with a drilling head (14) rotatable about its axis (16), which has a control surface (18) inclined to the axis (16) for its directional control and on which at least one nozzle (20) is provided for the discharge of a drilling fluid under pressure, wherein the nozzle opening is arranged on the axially parallel side of the drill head (14) facing away from the control surface (18), characterized in that the axial distance of the nozzle from the drill head tip and its jet direction are selected such that when the drill head is used, the one emerging from the nozzle The beam essentially only reaches the soil located to the side of the drill head. Erdbohrgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Düse (20) im wesentlichen senkrecht zur Bohrkopfachse (16) gerichtet ist.Earth boring machine according to claim 1, characterized in that the nozzle (20) is directed essentially perpendicular to the boring head axis (16). Erdbohrgerät nach Anspruch 1, dadurch gekennzeichnet, daß die Düse (20) unter einem Winkel zur Bohrkopfachse (16) in Vorwärtsrichtung des Bohrkopfes (14) gerichtet ist.Earth boring machine according to claim 1, characterized in that the nozzle (20) is directed at an angle to the drill head axis (16) in the forward direction of the drill head (14). Erdbohrgerät nach Anspruch 3, dadurch gekennzeichnet, daß die Düse (20) im wesentlichen parallel zur Steuerfläche (18) gerichtet ist.Earth boring machine according to claim 3, characterized in that the nozzle (20) is directed essentially parallel to the control surface (18). Erdbohrgerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß eine Mehrzahl von Düsen (20) vorgesehen ist.Earth boring machine according to one of claims 1 to 4, characterized in that a plurality of nozzles (20) is provided. Erdbohrgerät nach Anspruch 5, dadurch gekennzeichnet, daß die Düsen in einer im wesentlichen achsparallelen Reihe angeordnet sind.Earth boring machine according to claim 5, characterized in that the nozzles are arranged in an essentially axially parallel row. Erdbohrgerät nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß es für einen statischen Vortrieb des Bohrkopfes (14) ausgebildet ist.Earth boring machine according to one of claims 1 to 6, characterized in that it is designed for static propulsion of the drilling head (14). Erdbohrgerät nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß es als dynamisch schlagendes Rammbohrgerät ausgebildet ist.Earth boring machine according to one of claims 1 to 6, characterized in that it is designed as a dynamically striking ram boring machine.
EP94102651A 1993-02-22 1994-02-22 Earth drilling device Expired - Lifetime EP0612912B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4305423A DE4305423C2 (en) 1993-02-22 1993-02-22 Earth drilling rig
DE4305423 1993-02-22

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EP0612912A1 true EP0612912A1 (en) 1994-08-31
EP0612912B1 EP0612912B1 (en) 1997-05-14

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Also Published As

Publication number Publication date
EP0612912B1 (en) 1997-05-14
DE4305423A1 (en) 1994-08-25
DE4305423C2 (en) 1996-11-07
US5492184A (en) 1996-02-20

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