EP3215704B1 - Drilling ram device - Google Patents

Drilling ram device Download PDF

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Publication number
EP3215704B1
EP3215704B1 EP15812946.0A EP15812946A EP3215704B1 EP 3215704 B1 EP3215704 B1 EP 3215704B1 EP 15812946 A EP15812946 A EP 15812946A EP 3215704 B1 EP3215704 B1 EP 3215704B1
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EP
European Patent Office
Prior art keywords
ring insert
housing
section
ram boring
boring device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15812946.0A
Other languages
German (de)
French (fr)
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EP3215704A1 (en
Inventor
Franz-Josef Püttmann
Sadri SAMADRAXHA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tracto Technik GmbH and Co KG
Original Assignee
Tracto Technik GmbH and Co KG
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Application filed by Tracto Technik GmbH and Co KG filed Critical Tracto Technik GmbH and Co KG
Priority to PL15812946T priority Critical patent/PL3215704T3/en
Publication of EP3215704A1 publication Critical patent/EP3215704A1/en
Application granted granted Critical
Publication of EP3215704B1 publication Critical patent/EP3215704B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/26—Control devices for adjusting the stroke of the piston or the force or frequency of impact thereof
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers
    • E21B4/145—Fluid operated hammers of the self propelled-type, e.g. with a reverse mode to retract the device from the hole
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/06—Means for driving the impulse member
    • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
    • 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
    • E21B1/00—Percussion drilling
    • E21B1/38—Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • 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
    • E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B6/00—Drives for drilling with combined rotary and percussive action

Definitions

  • the invention relates to a ram boring device according to claim 1 and to a method for producing a ram boring device according to claim 8.
  • Ramm boring devices are known in the art and are used in particular for the production of horizontal wells.
  • Ramm boring devices are self-propelled boring devices.
  • such Rammbohrvorraum has a percussion piston which is oscillated (reciprocating) within a housing and thereby, depending on the desired direction of movement of the ram boring device, bounces on a front or rear impact surface of the housing.
  • the transmitted kinetic energy of the percussion piston ensures an acceleration of the ram boring device within the soil.
  • DE 10 2010 015 465 A1 has a Erdbohrvortechnisch as Rammbohrvortechnisch for drilling in the ground, which has at least one housing portion for a percussion piston.
  • Such a ram boring device is for example made DE 10 2009 038 383 A1 known.
  • the case of the DE 10 2009 038 383 A1 known Rammbohrvorraum is made of two parts. In one part, ie the rear part, the percussion piston oscillates. The other part, ie the front part, has the drill head and is acted upon by the percussion piston. The two parts are joined together by friction welding.
  • the rear part is a tube made of structural steel, which for the production of a housing portion of a ram boring a having predetermined inner diameter.
  • the front part is usually made of solid and is made of high quality steel, since the forces of the percussion piston act.
  • the friction weld After friction welding, the friction weld must be turned out consuming, so that the piston can be moved forward without an obstacle. After unscrewing the friction weld, the outer contour of the housing is also finished, so that all threads and other contours lie on one axis.
  • the invention is based on the object of improving a ram boring device and a method for producing a ram boring device such that a simpler structure is made possible.
  • the essence of the invention is to provide a ring insert in the impact section of the piston in the housing, which reduces the open cross-section of the housing in the region of the end of a Bohrkopf dictate acted upon by the percussion piston.
  • the outer and inner contour of the ram boring machine can be produced separately from the ring insert used or to be used. Previous considerations were that the entire front part must be made of a higher quality material with a one-piece connection between the outer contour and the impact surface for the piston. These well-thought-out considerations were overcome.
  • the ring insert is arranged in the housing such that it transmits at least a portion of the energy of the percussion piston to the housing.
  • the ring insert may itself have an impact surface for the percussion piston and in this way transmit the mechanical energy of the percussion piston impinging on the impact surface.
  • the mechanical energy can also be transmitted indirectly, for example by means of a drill head or drill bit, which is acted upon by the percussion piston, on the ring insert.
  • the housing can be made for example of a tube. A costly and expensive turning out a friction weld is no longer necessary. A previously contracted to third party friction welding can be omitted. The production time is reduced. The otherwise required mechanical processing - eg honing after the usual friction welding - are no longer necessary.
  • the ring insert can be arranged in the region of the impact surface for the percussion piston.
  • the ring insert may further comprise the impact surface for the percussion piston of the ram boring machine.
  • the corresponding housing section then no longer has to be machined mechanically after inserting the ring insert.
  • the ring insert may also be rigidly or movably connected to the drill head tip, wherein the drill head tip may have the impact surface for the percussion piston, which in turn transmits the mechanical energy of the percussion piston on the ring insert and thus on the housing.
  • ram boring device is meant, in particular, any device which is intermittently moved in an existing or to-be-created channel to create or expand a bore or destructively or non-destructively replace or clean an existing pipe, conduits into existing pipes or other long bodies as well as all devices for construction work of underground tunneling.
  • a ram boring device according to the invention may in particular be a self-propelled impact device for creating a horizontal bore.
  • ram boring device includes both earth displacement devices in which the drill head tip is fixedly connected to the housing and ram boring devices with axial, independently of the housing slidably mounted Bohrkopfspitze.
  • the bit may in particular be a bit.
  • a ram boring device according to the invention may be both a one-stroke device and a two-cycle device.
  • a two-stroke device initially proposes the percussion piston on the drill head tip, which leads in the first cycle.
  • the housing is acted upon by the percussion piston in the second cycle.
  • Tip resistance and skin friction are separated in a two-stroke device and alternately overcome more easily.
  • there is a better energy conversion which facilitates in particular the destruction of obstacles due to the concentration of the impact pulse on the drill head tip. Due to the anticipated according to the stroke of the drill head soil displacement housing remains in a quiet location, thereby ensuring a relatively good running stability.
  • the ram boring device according to the invention is not limited to underground earthworks.
  • lines in which a Erdbohrêt is operated run above ground.
  • horizontal drilling in the context of the present invention covers in particular any type of existing or to be created, preferably horizontal channels in a body, in particular earth channels including earth boreholes, rock holes or ground lines and underground or above-ground pipelines and sewers, which are characterized by use of a corresponding Rammbohrvorraum make, widen, destroy, cut or clean.
  • ring insert is not limited to a classic ring shape. It can therefore also have a different shape than the circular shape or be interrupted.
  • the ring insert may have an outer contour shape, which substantially corresponds to the inner contour shape of the portion in which the ring insert is inserted. It may be provided that the outer contour shape of the ring insert has an envelope, which corresponds substantially to the inner contour shape of the portion in which the ring insert is inserted.
  • the ring insert may have a, preferably centrally disposed, opening.
  • the ring insert is held in the section by means of a shrink connection.
  • a shrink connection This creates a very simple and cost-effective way to fix the ring insert in the section or to connect with this.
  • the ring insert on an outer contour, which has a larger dimension than a corresponding dimension of the inner contour of the housing portion without arranged in the housing portion ring insert.
  • the ring insert can be inserted into the housing section by creating a temperature difference between the ring insert and the housing section, whereby the inner diameter is temporarily increased and / or the outer contour is temporarily reduced. This can be done, for example, by externally applied heat or cold introduced from the inside.
  • the term "shrink connection" includes any type of connection in which a possibility is provided to arrange the slightly larger ring insert in the inner diameter of the housing portion. A shrink connection arises due to an oversize of the nested parts.
  • the portion in which the ring insert is held has a circular diameter.
  • the production can be simplified, since the ring insert can be used to the section rotationally invariant. It can be dispensed with a preferred situation when introducing the ring insert.
  • the ring insert may also be formed as part of the drill head or be present separately from this.
  • the ring insert can be arranged on the end side of the drill head.
  • the ring insert can be arranged at the end in the housing section of the drill head or the drill head tip.
  • the end arranged in the housing section Ring insert can be used in front of the housing section for the percussion piston.
  • the ring insert has a different material than the housing.
  • the term "comprising" in the sense of the invention includes that a material or a component is present (the pure sense of the term), but also that the element referred to consists of the material, wherein any impurities or residual constituents may be present ,
  • the ram boring apparatus comprises a ring insert comprising a material which is heat treated.
  • different properties can be set by means of the heat treatment, depending on which heat treatment of the material has been carried out. Different heat treatments can lead to different properties.
  • the heat treatment may be such as to cause a sweeping microstructural transformation (annealing or hardening) and / or only a transformation on the surface of a workpiece (diffusion or coating process).
  • the different heat treatments can be detected for example by means of a micrograph.
  • FIG. 1 the front portion of a ram boring machine according to the invention is shown in a sectional side view.
  • the Fig. 1 shows a first embodiment.
  • the ram boring device on a housing 1, in which a percussion piston 2 is mounted oscillatingly movable.
  • the percussion piston 2 is placed in the known manner by means of compressed air, which is supplied to the ram boring device at its rear end (not shown) via a compressed air line in the oscillating motion, wherein they are in the drilling operation of the ram boring device in each cycle of their movement on a front striking surface incident.
  • Fig. 1 Rammbohrvorraum shown is a working according to the 2-stroke principle ram boring device.
  • the percussion piston 2 strikes in two stages, first on a drill head tip 3, which is designed in the form of a chisel, and then on an inner insert or ring insert 4 in the housing 1.
  • the drill head 3 is in the drill head 5 axially, independently of the housing 1, slidably mounted , An end of the drill bit tip 3 extends through a reduced cross-section in the interior of a portion of the housing 1, which is formed by the ring insert 4.
  • the ring insert 4 comprises the impact surface for the percussion piston 2.
  • the impact surface is formed as a base surface of a conically tapered cavity in the ring insert 4.
  • the housing 1 has a circular inner contour with an inner diameter.
  • the ring insert 4 has a circular outer contour with an outer diameter.
  • the ring insert 4 is slightly larger in outer diameter than the inner diameter of the housing 1, provided that ring insert 4 and housing 1 are in the range of the considered section at the same temperature.
  • the housing 1 may be heated and / or the ring insert 4 may have been cooled.
  • the ring insert 4 can be brought to the desired position in the housing 1. After cooling or heating of the housing 1 and the ring insert 4 at the same temperature of the ring insert 4 is fixed in position to the housing 1.
  • the drill head 5, the in WO 2011/128045 A2 disclosed drill head correspond to a ram boring device.
  • the Fig. 2 shows an alternative embodiment with a bottom end inserted into the housing 1 drill head 5, which has an inner insert or ring insert 4, which was inserted into the housing 1 to reduce the cross-section and forming an impact surface for the percussion piston 2.
  • the ring insert 4 has been shrunk into the end-side portion of the housing 1. Through the ring insert 4, the drill head tip 3 extends to one end. The drill head tip 3 is the end guided and has an impact surface for the percussion piston 2.
  • the Fig. 2 illustrated embodiment operates on the one-stroke principle.
  • the Fig. 3 shows an alternative embodiment in which the end in the housing 1, a ring insert 4 has been used, which is part of a drill head 5.
  • the ring insert 4 of Fig. 3 it is the end portion of a shrunken front housing or drill head, which has an axially, independently of the housing 1 slidably mounted Bohrkopfspitze 3.
  • the Fig. 3 illustrated embodiment operates on the two-stroke principle.
  • the ring insert 4 and the drill head tip 3 each have an impact surface for the percussion piston 2, to which the percussion piston 2 impinges successively in a forward movement.
  • the in Fig. 3 illustrated embodiment is on the WO 2011/128045 A2 directed.
  • the Fig. 4 shows an alternative embodiment in which the end in the housing 1, a ring insert 4 has been used, which is part of a drill head 5.
  • the ring insert 4 of Fig. 4 it is the end portion of a shrunken front housing or drill head 5, which has an axially, independently of the housing 1 slidably mounted Bohrkopfspitze 3.
  • a compression spring is arranged, which is compressed by a loading of the drill head tip 3 by means of the percussion piston 2.
  • the drill head tip 3 has an impact surface for the percussion piston 2.
  • the drill head tip 3 Due to the action of the drill head tip 3 by means of the percussion piston 2, the drill head tip 3 can hit the ring insert 4 after the spring arranged between the drill head tip 3 and the ring insert 4 has been at least partially compressed.
  • the Fig. 4 illustrated embodiment operates on the two-stroke principle. First, the percussion piston 2 impinges on the drill head tip 3. Due to the pulse transmitted by the percussion piston 2, the drill head tip 3 strikes the ring insert 4 after sufficient compression of the compression spring.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Automation & Control Theory (AREA)
  • Earth Drilling (AREA)

Description

Die Erfindung betrifft eine Rammbohrvorrichtung gemäß Anspruch 1 sowie ein Verfahren zum Herstellen einer Rammbohrvorrichtung gemäß Anspruch 8.The invention relates to a ram boring device according to claim 1 and to a method for producing a ram boring device according to claim 8.

Rammbohrvorrichtungen sind aus dem Stand der Technik bekannt und werden insbesondere für die Herstellung von horizontalen Erdbohrungen verwendet. Bei Rammbohrvorrichtungen handelt es sich um selbstgetriebene Bohrvorrichtungen. In der Regel weist eine derartige Rammbohrvorrichtung einen Schlagkolben auf, der innerhalb eines Gehäuses oszillierend (hin- und her-) bewegt wird und dabei, je nach gewünschter Bewegungsrichtung der Rammbohrvorrichtung, auf eine vordere oder hintere Schlagfläche des Gehäuses prallt. Die dabei übertragene kinetische Energie des Schlagkolbens sorgt für eine Beschleunigung der Rammbohrvorrichtung innerhalb des Erdreichs.Ramm boring devices are known in the art and are used in particular for the production of horizontal wells. Ramm boring devices are self-propelled boring devices. In general, such Rammbohrvorrichtung has a percussion piston which is oscillated (reciprocating) within a housing and thereby, depending on the desired direction of movement of the ram boring device, bounces on a front or rear impact surface of the housing. The transmitted kinetic energy of the percussion piston ensures an acceleration of the ram boring device within the soil.

DE 10 2010 015 465 A1 hat eine Erdbohrvorrichtung als Rammbohrvorrichtung zum Bohren im Erdreich, die mindestens einen Gehäuseabschnitt für einen Schlagkolben aufweist. DE 10 2010 015 465 A1 has a Erdbohrvorrichtung as Rammbohrvorrichtung for drilling in the ground, which has at least one housing portion for a percussion piston.

Eine derartige Rammbohrvorrichtung ist beispielsweise aus DE 10 2009 038 383 A1 bekannt. Das Gehäuse der aus der DE 10 2009 038 383 A1 bekannten Rammbohrvorrichtung ist aus zwei Teilen gefertigt. In einem Teil, d.h. dem hinteren Teil, oszilliert der Schlagkolben. Der andere Teil, d.h. der vordere Teil, weist den Bohrkopf auf und wird von dem Schlagkolben beaufschlagt. Die beiden Teile werden durch Reibschweißen miteinander verbunden. Üblicherweise ist der hintere Teil ein Rohr aus Baustahl, welches für die Herstellung eines Gehäuseabschnitts einer Rammbohrvorrichtung einen vorbestimmten Innendurchmesser aufweist. Der vordere Teil ist üblicherweise aus dem Vollen gefertigt und besteht aus höherwertigem Stahl, da die Kräfte des Schlagkolbens wirken. Nach dem Reibschweißen muss die Reibschweißnaht aufwendig ausgedreht werden, damit der Kolben ohne ein Hindernis nach vorne bewegt werden kann. Nach dem Ausdrehen der Reibschweißnaht erfolgt zudem das Fertigdrehen der Außenkontur des Gehäuses, damit alle Gewinde und andere Konturen auf einer Achse liegen.Such a ram boring device is for example made DE 10 2009 038 383 A1 known. The case of the DE 10 2009 038 383 A1 known Rammbohrvorrichtung is made of two parts. In one part, ie the rear part, the percussion piston oscillates. The other part, ie the front part, has the drill head and is acted upon by the percussion piston. The two parts are joined together by friction welding. Usually, the rear part is a tube made of structural steel, which for the production of a housing portion of a ram boring a having predetermined inner diameter. The front part is usually made of solid and is made of high quality steel, since the forces of the percussion piston act. After friction welding, the friction weld must be turned out consuming, so that the piston can be moved forward without an obstacle. After unscrewing the friction weld, the outer contour of the housing is also finished, so that all threads and other contours lie on one axis.

Der Erfindung liegt nun die Aufgabe zugrunde, eine Rammbohrvorrichtung und ein Verfahren zum Herstellen einer Rammbohrvorrichtung dahingehend zu verbessern, dass ein einfacherer Aufbau ermöglicht wird.The invention is based on the object of improving a ram boring device and a method for producing a ram boring device such that a simpler structure is made possible.

Diese Aufgabe wird durch den Gegenstand der nebengeordneten Ansprüche gelöst. Vorteilhafte Ausführungsformen sind in den Unteransprüchen beansprucht und ergeben sich aus der nachfolgenden Beschreibung der Erfindung.This object is achieved by the subject matter of the independent claims. Advantageous embodiments are claimed in the subclaims and will become apparent from the following description of the invention.

Kern der Erfindung ist es, in dem Aufschlagabschnitt des Kolbens im Gehäuse einen Ringeinsatz vorzusehen, der den offenen Querschnitt des Gehäuses im Bereich des mit dem Schlagkolben beaufschlagbaren Endes einer Bohrkopfspitze verkleinert.The essence of the invention is to provide a ring insert in the impact section of the piston in the housing, which reduces the open cross-section of the housing in the region of the end of a Bohrkopfspitze acted upon by the percussion piston.

Es wurde erkannt, dass ein mit dem Schlagkolben beaufschlagter Abschnitt des Gehäuses, der die Aufschlagsfläche für den Schlagkolben aufweisen kann, trotz der hohen mechanischen Beanspruchung nicht aus einem Stück mit dem Gehäuse bestehen muss. Erfindungsgemäß kann die Außen- und Innenkontur des Rammbohrgerätes getrennt von dem eingesetzten bzw. einzusetzenden Ringeinsatz hergestellt werden. Bisherige Überlegungen zielten darauf, dass der gesamte vordere Teil aus einem höherwertigen Material mit einer einstückigen Verbindung zwischen der Außenkontur und der Aufschlagsfläche für den Kolben gefertigt sein muss. Diese eingefahrenen Überlegungen wurden überwunden. Der Ringeinsatz ist im Gehäuse derart angeordnet, dass er zumindest einen Teil der Energie des Schlagkolbens auf das Gehäuse überträgt. Der Ringeinsatz kann selbst eine Aufschlagfläche für den Schlagkolben aufweisen und derartig die mechanische Energie des auf die Aufschlagfläche auftreffenden Schlagkolbens übertragen. Die mechanische Energie kann auch indirekt beispielsweise mittels Bohrkopf oder Bohrspitze, der bzw. die vom Schlagkolben beaufschlagt wird, auf den Ringeinsatz übertragen werden.It has been recognized that a section of the housing which is acted upon by the percussion piston and which may have the striking surface for the percussion piston does not have to be made in one piece with the housing despite the high mechanical stress. According to the invention, the outer and inner contour of the ram boring machine can be produced separately from the ring insert used or to be used. Previous considerations were that the entire front part must be made of a higher quality material with a one-piece connection between the outer contour and the impact surface for the piston. These well-thought-out considerations were overcome. The ring insert is arranged in the housing such that it transmits at least a portion of the energy of the percussion piston to the housing. The ring insert may itself have an impact surface for the percussion piston and in this way transmit the mechanical energy of the percussion piston impinging on the impact surface. The mechanical energy can also be transmitted indirectly, for example by means of a drill head or drill bit, which is acted upon by the percussion piston, on the ring insert.

Dadurch lässt sich das bekannte Reibschweißen erfindungsgemäß vermeiden. Das bietet mehrere Vorteile. Das Gehäuse kann beispielsweise aus einem Rohr gefertigt werden. Ein aufwendiges und teures Ausdrehen einer Reibschweißnaht ist nicht mehr erforderlich. Ein bisher an Drittunternehmen beauftragtes Reibschweißen kann entfallen. Die Herstellungszeit wird verringert. Die sonst erforderlichen mechanischen Bearbeitungen - z.B. Honen nach dem sonst üblichen Reibschweißen - sind nicht mehr notwendig.As a result, the known friction welding can be avoided according to the invention. This offers several advantages. The housing can be made for example of a tube. A costly and expensive turning out a friction weld is no longer necessary. A previously contracted to third party friction welding can be omitted. The production time is reduced. The otherwise required mechanical processing - eg honing after the usual friction welding - are no longer necessary.

Der Ringeinsatz kann im Bereich der Aufschlagsfläche für den Schlagkolben angeordnet sein. Der Ringeinsatz kann ferner die Aufschlagsfläche für den Schlagkolben des Rammbohrgeräts aufweisen. Der entsprechende Gehäuseabschnitt muss dann nach Einbringen des Ringeinsatzes nicht mehr mechanisch bearbeitet werden. Der Ringeinsatz kann auch starr oder beweglich mit der Bohrkopfspitze verbunden sein, wobei auch die Bohrkopfspitze die Aufschlagsfläche für den Schlagkolben aufweisen kann, die ihrerseits die mechanische Energie des Schlagkolbens auf den Ringeinsatz und damit auf das Gehäuse überträgt.The ring insert can be arranged in the region of the impact surface for the percussion piston. The ring insert may further comprise the impact surface for the percussion piston of the ram boring machine. The corresponding housing section then no longer has to be machined mechanically after inserting the ring insert. The ring insert may also be rigidly or movably connected to the drill head tip, wherein the drill head tip may have the impact surface for the percussion piston, which in turn transmits the mechanical energy of the percussion piston on the ring insert and thus on the housing.

Unter "Rammbohrvorrichtung" wird insbesondere jedes Gerät verstanden, welches in einem bestehenden oder zu erstellenden Kanal stoßweise bewegt wird, um eine Bohrung zu erstellen oder aufzuweiten oder ein bestehendes Rohr zerstörend oder nicht zerstörend zu ersetzen oder zu reinigen, Leitungen in bestehende Rohre oder andere Langkörper einzuziehen sowie sämtliche Vorrichtungen für Bauarbeiten des unterirdischen Vortriebs. Eine erfindungsgemäße Rammbohrvorrichtung kann insbesondere ein selbstgetriebenes Schlaggerät zur Erstellung einer Horizontalbohrung sein.By "ram boring device" is meant, in particular, any device which is intermittently moved in an existing or to-be-created channel to create or expand a bore or destructively or non-destructively replace or clean an existing pipe, conduits into existing pipes or other long bodies as well as all devices for construction work of underground tunneling. A ram boring device according to the invention may in particular be a self-propelled impact device for creating a horizontal bore.

Der Begriff "Rammbohrvorrichtung" umfasst sowohl Erdverdrängungsvorrichtungen, bei denen die Bohrkopfspitze fest mit dem Gehäuse verbunden ist als auch Rammbohrvorrichtungen mit axial, unabhängig vom Gehäuse verschiebbar gelagerter Bohrkopfspitze. Bei der Bohrkopfspitze kann es sich insbesondere um einen Meißel handeln. Eine erfindungsgemäße Rammbohrvorrichtung kann sowohl eine Ein-Takt-Vorrichtung als auch eine Zwei-Takt-Vorrichtung sein. Bei einer Zwei-Takt-Vorrichtung schlägt zunächst der Schlagkolben auf die Bohrkopfspitze, die im ersten Takt vorauseilt. Das Gehäuse wird im zweiten Takt vom Schlagkolben beaufschlagt. Spitzenwiderstand und Mantelreibung werden bei einer Zwei-Takt-Vorrichtung getrennt und abwechselnd leichter überwunden. Bei einer Zwei-Takt-Vorrichtung erfolgt eine bessere Energieumsetzung, die insbesondere die Zertrümmerung von Hindernissen infolge der Konzentration des Schlagimpulses auf die Bohrkopfspitze erleichtert. Infolge der entsprechend dem Hubweg des Bohrkopfes vorauseilenden Bodenverdrängung bleibt das Gehäuse in ruhiger Lage und gewährleistet dadurch eine relativ gute Laufstabilität.The term "ram boring device" includes both earth displacement devices in which the drill head tip is fixedly connected to the housing and ram boring devices with axial, independently of the housing slidably mounted Bohrkopfspitze. The bit may in particular be a bit. A ram boring device according to the invention may be both a one-stroke device and a two-cycle device. In a two-stroke device initially proposes the percussion piston on the drill head tip, which leads in the first cycle. The housing is acted upon by the percussion piston in the second cycle. Tip resistance and skin friction are separated in a two-stroke device and alternately overcome more easily. In a two-stroke device, there is a better energy conversion, which facilitates in particular the destruction of obstacles due to the concentration of the impact pulse on the drill head tip. Due to the anticipated according to the stroke of the drill head soil displacement housing remains in a quiet location, thereby ensuring a relatively good running stability.

Die Rammbohrvorrichtung im Sinne der Erfindung ist nicht auf unterirdische Erdarbeiten beschränkt. So können beispielsweise Leitungen, in denen ein Erdbohrgerät betrieben wird, auch oberirdisch verlaufen.The ram boring device according to the invention is not limited to underground earthworks. Thus, for example, lines in which a Erdbohrgerät is operated, run above ground.

Der Begriff "Horizontalbohrung" im Sinne der vorliegenden Erfindung erfasst insbesondere jede Art von bestehenden oder zu erstellenden, vorzugsweise horizontalen Kanälen in einem Körper, insbesondere Erdkanäle einschließlich Erdbohrungen, Felsbohrungen oder Erdleitungen sowie unterirdische oder oberirdische Rohrleitungen und Abwasserkanäle, die sich durch Einsatz einer entsprechenden Rammbohrvorrichtung herstellen, aufweiten, zerstören, aufschneiden oder reinigen lassen.The term "horizontal drilling" in the context of the present invention covers in particular any type of existing or to be created, preferably horizontal channels in a body, in particular earth channels including earth boreholes, rock holes or ground lines and underground or above-ground pipelines and sewers, which are characterized by use of a corresponding Rammbohrvorrichtung make, widen, destroy, cut or clean.

Der Begriff "Ringeinsatz" ist nicht auf eine klassische Ringform beschränkt. Er kann also auch eine andere Form als die Kreisform aufweisen oder unterbrochen sein. Insbesondere kann der Ringeinsatz eine äußere Konturform aufweisen, die im Wesentlichen der Innenkonturform des Abschnitts entspricht, in den der Ringeinsatz eingesetzt ist. Es kann vorgesehen sein, dass die äußere Konturform des Ringeinsatzes eine Einhüllende aufweist, die im Wesentlichen der Innenkonturform des Abschnitts entspricht, in dem der Ringeinsatz eingesetzt ist. Insbesondere kann der Ringeinsatz eine, vorzugsweise mittig angeordnete, Öffnung aufweisen.The term "ring insert" is not limited to a classic ring shape. It can therefore also have a different shape than the circular shape or be interrupted. In particular, the ring insert may have an outer contour shape, which substantially corresponds to the inner contour shape of the portion in which the ring insert is inserted. It may be provided that the outer contour shape of the ring insert has an envelope, which corresponds substantially to the inner contour shape of the portion in which the ring insert is inserted. In particular, the ring insert may have a, preferably centrally disposed, opening.

Der Ringeinsatz ist im Abschnitt mittels einer Schrumpf-Verbindung gehalten. Hierdurch wird eine sehr einfache und kostengünstige Möglichkeit geschaffen, den Ringeinsatz in dem Abschnitt zu fixieren bzw. mit diesem zu verbinden. Bei dieser Ausführungsform der Erfindung weist der Ringeinsatz eine Außenkontur auf, die eine größere Abmessung umfasst als eine entsprechende Abmessung der Innenkontur des Gehäuseabschnitts ohne im Gehäuseabschnitt angeordneten Ringeinsatz. Der Ringeinsatz kann in den Gehäuseabschnitt eingeführt werden, indem ein Temperaturunterschied zwischen Ringeinsatz und Gehäuseabschnitt erzeugt wird, wodurch der Innendurchmesser temporär vergrößert und/oder die Außenkontur temporär verkleinert wird. Dies kann beispielsweise mittels von außen aufgebrachter Wärme oder von Innen eingeführter Kälte erfolgen. Der Begriff "Schrumpf-Verbindung" umfasst jegliche Art von Verbindung, bei der eine Möglichkeit geschaffen wird, den geringfügig größeren Ringeinsatz in dem Innendurchmesser des Gehäuseabschnitts anzuordnen. Eine Schrumpf-Verbindung entsteht infolge eines Übermaßes der ineinander gesetzten Teile.The ring insert is held in the section by means of a shrink connection. This creates a very simple and cost-effective way to fix the ring insert in the section or to connect with this. In this embodiment of the invention, the ring insert on an outer contour, which has a larger dimension than a corresponding dimension of the inner contour of the housing portion without arranged in the housing portion ring insert. The ring insert can be inserted into the housing section by creating a temperature difference between the ring insert and the housing section, whereby the inner diameter is temporarily increased and / or the outer contour is temporarily reduced. This can be done, for example, by externally applied heat or cold introduced from the inside. The term "shrink connection" includes any type of connection in which a possibility is provided to arrange the slightly larger ring insert in the inner diameter of the housing portion. A shrink connection arises due to an oversize of the nested parts.

Vorteilhafterweise weist der Abschnitt, in dem der Ringeinsatz gehalten wird, einen kreisförmigen Durchmesser auf. Hierdurch kann die Herstellung vereinfacht werden, da der Ringeinsatz zum Abschnitt rotationsinvariant eingesetzt werden kann. Es kann auf eine Vorzugslage beim Einbringen des Ringeinsatzes verzichtet werden.Advantageously, the portion in which the ring insert is held has a circular diameter. As a result, the production can be simplified, since the ring insert can be used to the section rotationally invariant. It can be dispensed with a preferred situation when introducing the ring insert.

Der Ringeinsatz kann auch als Teil des Bohrkopfs ausgebildet sein oder separat von diesem vorliegen. Der Ringeinsatz kann endseitig am Bohrkopf angeordnet sein. Insbesondere kann der Ringeinsatz endseitig im Gehäuseabschnitt des Bohrkopfs bzw. der Bohrkopfspitze angeordnet sein. Der endseitig in dem Gehäuseabschnitt angeordnete Ringeinsatz kann vor dem Gehäuseabschnitt für den Schlagkolben eingesetzt sein.The ring insert may also be formed as part of the drill head or be present separately from this. The ring insert can be arranged on the end side of the drill head. In particular, the ring insert can be arranged at the end in the housing section of the drill head or the drill head tip. The end arranged in the housing section Ring insert can be used in front of the housing section for the percussion piston.

In einer bevorzugten Ausführungsform weist der Ringeinsatz ein anderes Material als das Gehäuse auf. Hierdurch kann die Möglichkeit geschaffen werden, den einzelnen Anforderungen des Ringeinsatzes, welcher eine Aufschlagfläche für den Schlagkolben aufweisen kann, und des Gehäuses Rechnung zu tragen. Der Begriff "aufweisen" umfasst im Sinne der Erfindung, dass ein Material bzw. eine Komponente vorhanden ist (den reinen Wortsinn des Begriffes), aber auch, dass das in Bezug genommene Element aus dem Material besteht, wobei allfällige Verunreinigungen oder Restbestandteile vorhanden sein können.In a preferred embodiment, the ring insert has a different material than the housing. In this way, the possibility can be created to take into account the individual requirements of the ring insert, which may have an impact surface for the percussion piston, and the housing. The term "comprising" in the sense of the invention includes that a material or a component is present (the pure sense of the term), but also that the element referred to consists of the material, wherein any impurities or residual constituents may be present ,

In einer bevorzugten Ausführungsform weist die Rammbohrvorrichtung einen Ringeinsatz auf, der ein Material umfasst, welches wärmebehandelt ist. Mittels der Wärmebehandlung können beispielsweise unterschiedliche Eigenschaften eingestellt werden, je nachdem, welche Wärmebehandlung des Materials durchgeführt wurde. Unterschiedliche Wärmebehandlungen können zu unterschiedlichen Eigenschaften führen. Die Wärmebehandlung kann derart sein, dass eine durchgreifende Gefügeumwandlung (Glühen oder Härten) und/oder lediglich eine Umwandlung an der Oberfläche eines Werkstücks (Diffusions- oder Beschichtungsverfahren) bewirkt wird. Die unterschiedlichen Wärmebehandlungen können beispielsweise mittels eines Schliffbildes nachgewiesen werden.In a preferred embodiment, the ram boring apparatus comprises a ring insert comprising a material which is heat treated. By way of example, different properties can be set by means of the heat treatment, depending on which heat treatment of the material has been carried out. Different heat treatments can lead to different properties. The heat treatment may be such as to cause a sweeping microstructural transformation (annealing or hardening) and / or only a transformation on the surface of a workpiece (diffusion or coating process). The different heat treatments can be detected for example by means of a micrograph.

Die vorstehenden Ausführungen stellen ebenso wie die nachfolgende Beschreibung beispielhafter Ausführungsformen keinen Verzicht auf bestimmte Ausführungsformen oder Merkmale dar.The above statements as well as the following description of exemplary embodiments do not represent a waiver of certain embodiments or features.

Die Erfindung wird nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. In den Zeichnungen zeigt:

Fig. 1
einen vorderen Bereich einer erfindungsgemäßen Rammbohrvorrichtung in einer geschnittenen Seitenansicht in einer ersten Ausführungsform;
Fig. 2
einen vorderen Bereich einer erfindungsgemäßen Rammbohrvorrichtung in einer geschnittenen Seitenansicht in einer zweiten Ausführungsform;
Fig. 3
einen vorderen Bereich einer erfindungsgemäßen Rammbohrvorrichtung in einer geschnittenen Seitenansicht in einer dritten Ausführungsform; und
Fig. 4
einen vorderen Bereich einer erfindungsgemäßen Rammbohrvorrichtung in einer geschnittenen Seitenansicht in einer vierten Ausführungsform.
The invention will be explained in more detail with reference to an embodiment shown in the drawings. In the drawings shows:
Fig. 1
a front portion of a ram boring device according to the invention in a sectional side view in a first embodiment;
Fig. 2
a front portion of a ram boring device according to the invention in a sectional side view in a second embodiment;
Fig. 3
a front portion of a ram boring device according to the invention in a sectional side view in a third embodiment; and
Fig. 4
a front portion of a ram boring device according to the invention in a sectional side view in a fourth embodiment.

In Fig. 1 ist der vordere Bereich eines erfindungsgemäßen Rammbohrgeräts in einer geschnittenen Seitenansicht dargestellt. Die Fig. 1 zeigt eine erste Ausführungsform. In diesem Abschnitt weist das Rammbohrgerät ein Gehäuse 1 auf, in dem ein Schlagkolben 2 oszillierend beweglich gelagert ist. Der Schlagkolben 2 wird auf bekannte Art und Weise mittels Druckluft, die der Rammbohrvorrichtung an ihrem rückseitigen Ende (nicht dargestellt) über eine Druckluftleitung zugeführt wird, in die oszillierende Bewegung versetzt, wobei sie im Bohrbetrieb der Rammbohrvorrichtung in jedem Zyklus ihrer Bewegung auf eine vordere Schlagfläche auftrifft.In Fig. 1 the front portion of a ram boring machine according to the invention is shown in a sectional side view. The Fig. 1 shows a first embodiment. In this section, the ram boring device on a housing 1, in which a percussion piston 2 is mounted oscillatingly movable. The percussion piston 2 is placed in the known manner by means of compressed air, which is supplied to the ram boring device at its rear end (not shown) via a compressed air line in the oscillating motion, wherein they are in the drilling operation of the ram boring device in each cycle of their movement on a front striking surface incident.

Die in Fig. 1 gezeigte Rammbohrvorrichtung ist eine nach dem 2-Takt-Prinzip arbeitende Rammbohrvorrichtung. Der Schlagkolben 2 trifft in zwei Stufen zunächst auf eine Bohrkopfspitze 3, die in Form eines Meißels ausgestaltet ist, und dann auf einen Inneneinsatz bzw. Ringeinsatz 4 im Gehäuse 1. Die Bohrkopfspitze 3 ist im Bohrkopf 5 axial, unabhängig vom Gehäuse 1, verschiebbar gelagert. Ein Ende der Bohrkopfspitze 3 erstreckt sich durch einen verkleinerten Querschnitt im Inneren eines Abschnitts des Gehäuses 1, welcher durch den Ringeinsatz 4 ausgebildet wird. Der Ringeinsatz 4 umfasst die Aufschlagsfläche für den Schlagkolben 2. Die Aufschlagsfläche ist als Basisfläche eines sich konisch verjüngenden Hohlraums im Ringeinsatz 4 ausgebildet. Das Gehäuse 1 weist im Abschnitt mit dem Ringeinsatz 4 eine kreisförmige Innenkontur mit einem Innendurchmesser auf. Der Ringeinsatz 4 weist eine kreisförmige Außenkontur mit einem Außendurchmesser auf. Der Ringeinsatz 4 ist im Außendurchmesser etwas größer als der Innendurchmesser des Gehäuses 1, sofern sich Ringeinsatz 4 und Gehäuse 1 im Bereich des betrachteten Abschnitts auf gleicher Temperatur befinden. Um den Ringeinsatz 4 in das Gehäuse 1 einzubringen, kann das Gehäuse 1 erwärmt und/oder der Ringeinsatz 4 gekühlt worden sein. Der Ringeinsatz 4 kann so auf die gewünschte Position im Gehäuse 1 gebracht werden. Nach Abkühlen bzw. Erwärmen des Gehäuses 1 bzw. des Ringeinsatzes 4 auf gleiche Temperatur ist der Ringeinsatz 4 in der Position zum Gehäuse 1 fixiert.In the Fig. 1 Rammbohrvorrichtung shown is a working according to the 2-stroke principle ram boring device. The percussion piston 2 strikes in two stages, first on a drill head tip 3, which is designed in the form of a chisel, and then on an inner insert or ring insert 4 in the housing 1. The drill head 3 is in the drill head 5 axially, independently of the housing 1, slidably mounted , An end of the drill bit tip 3 extends through a reduced cross-section in the interior of a portion of the housing 1, which is formed by the ring insert 4. The ring insert 4 comprises the impact surface for the percussion piston 2. The impact surface is formed as a base surface of a conically tapered cavity in the ring insert 4. In the section with the ring insert 4, the housing 1 has a circular inner contour with an inner diameter. The ring insert 4 has a circular outer contour with an outer diameter. The ring insert 4 is slightly larger in outer diameter than the inner diameter of the housing 1, provided that ring insert 4 and housing 1 are in the range of the considered section at the same temperature. In order to introduce the ring insert 4 into the housing 1, the housing 1 may be heated and / or the ring insert 4 may have been cooled. The ring insert 4 can be brought to the desired position in the housing 1. After cooling or heating of the housing 1 and the ring insert 4 at the same temperature of the ring insert 4 is fixed in position to the housing 1.

Der Bohrkopf 5 kann dem in WO 2011/128045 A2 offenbarten Bohrkopf einer Rammbohrvorrichtung entsprechen.The drill head 5, the in WO 2011/128045 A2 disclosed drill head correspond to a ram boring device.

Die Fig. 2 zeigt eine alternative Ausführungsform mit einem endseitig in das Gehäuse 1 eingesetzten Bohrkopf 5, der einen Inneneinsatz bzw. Ringeinsatz 4 aufweist, der in das Gehäuse 1 zur Verkleinerung des Querschnitts und Ausbildung einer Aufschlagsfläche für den Schlagkolben 2 eingesetzt wurde. Der Ringeinsatz 4 ist in den endseitigen Abschnitt des Gehäuses 1 eingeschrumpft worden. Durch den Ringeinsatz 4 erstreckt sich die Bohrkopfspitze 3 mit einem Ende. Die Bohrkopfspitze 3 wird endseitig geführt und weist eine Aufschlagsfläche für den Schlagkolben 2 auf. Die in Fig. 2 dargestellte Ausführungsform arbeitet nach dem Ein-Takt-Prinzip.The Fig. 2 shows an alternative embodiment with a bottom end inserted into the housing 1 drill head 5, which has an inner insert or ring insert 4, which was inserted into the housing 1 to reduce the cross-section and forming an impact surface for the percussion piston 2. The ring insert 4 has been shrunk into the end-side portion of the housing 1. Through the ring insert 4, the drill head tip 3 extends to one end. The drill head tip 3 is the end guided and has an impact surface for the percussion piston 2. In the Fig. 2 illustrated embodiment operates on the one-stroke principle.

Die Fig. 3 zeigt eine alternative Ausführungsform, bei dem endseitig in das Gehäuse 1 ein Ringeinsatz 4 eingesetzt wurde, der Teil eines Bohrkopfes 5 ist. Bei dem Ringeinsatz 4 der Fig. 3 handelt es sich um den Endabschnitt eines eingeschrumpften Vordergehäuses bzw. Bohrkopfes, das eine axial, unabhängig vom Gehäuse 1 verschiebbar gelagerte Bohrkopfspitze 3 aufweist. Die in Fig. 3 dargestellte Ausführungsform arbeitet nach dem Zwei-Takt-Prinzip. Der Ringeinsatz 4 und die Bohrkopfspitze 3 weisen jeweils eine Aufschlagsfläche für den Schlagkolben 2 auf, auf die der Schlagkolben 2 zeitlich nacheinander bei einer Bewegung nach vorne auftrifft. Hinsichtlich des Aufbaus des Bohrkopfes 5, der in Fig. 3 dargestellten Ausführungsform, wird auf die WO 2011/128045 A2 verwiesen.The Fig. 3 shows an alternative embodiment in which the end in the housing 1, a ring insert 4 has been used, which is part of a drill head 5. In the ring insert 4 of Fig. 3 it is the end portion of a shrunken front housing or drill head, which has an axially, independently of the housing 1 slidably mounted Bohrkopfspitze 3. In the Fig. 3 illustrated embodiment operates on the two-stroke principle. The ring insert 4 and the drill head tip 3 each have an impact surface for the percussion piston 2, to which the percussion piston 2 impinges successively in a forward movement. With regard to the structure of the drill head 5, the in Fig. 3 illustrated embodiment is on the WO 2011/128045 A2 directed.

Die Fig. 4 zeigt eine alternative Ausführungsform, bei dem endseitig in das Gehäuse 1 ein Ringeinsatz 4 eingesetzt wurde, der Teil eines Bohrkopfes 5 ist. Bei dem Ringeinsatz 4 der Fig. 4 handelt es sich um den Endabschnitt eines eingeschrumpften Vordergehäuses bzw. Bohrkopfes 5, das eine axial, unabhängig vom Gehäuse 1 verschiebbar gelagerte Bohrkopfspitze 3 aufweist. Zwischen der Bohrkopfspitze 3 und dem Ringeinsatz 4 ist eine Druckfeder angeordnet, die bei einer Beaufschlagung der Bohrkopfspitze 3 mittels des Schlagkolbens 2 zusammengedrückt wird. Die Bohrkopfspitze 3 weist eine Aufschlagsfläche für den Schlagkolben 2 auf. Aufgrund der Beaufschlagung der Bohrkopfspitze 3 mittels des Schlagkolbens 2 kann die Bohrkopfspitze 3 auf den Ringeinsatz 4 treffen, nachdem die zwischen der Bohrkopfspitze 3 und dem Ringeinsatz 4 angeordnete Feder zumindest teilweise zusammengedrückt wurde. Die in Fig. 4 dargestellte Ausführungsform arbeitet nach dem Zwei-Takt-Prinzip. Zunächst trifft der Schlagkolben 2 auf die Bohrkopfspitze 3 auf. Durch den von dem Schlagkolben 2 übertragenen Impuls trifft die Bohrkopfspitze 3 auf den Ringeinsatz 4 auf nach ausreichender Kompression der Druckfeder.The Fig. 4 shows an alternative embodiment in which the end in the housing 1, a ring insert 4 has been used, which is part of a drill head 5. In the ring insert 4 of Fig. 4 it is the end portion of a shrunken front housing or drill head 5, which has an axially, independently of the housing 1 slidably mounted Bohrkopfspitze 3. Between the drill head tip 3 and the ring insert 4, a compression spring is arranged, which is compressed by a loading of the drill head tip 3 by means of the percussion piston 2. The drill head tip 3 has an impact surface for the percussion piston 2. Due to the action of the drill head tip 3 by means of the percussion piston 2, the drill head tip 3 can hit the ring insert 4 after the spring arranged between the drill head tip 3 and the ring insert 4 has been at least partially compressed. In the Fig. 4 illustrated embodiment operates on the two-stroke principle. First, the percussion piston 2 impinges on the drill head tip 3. Due to the pulse transmitted by the percussion piston 2, the drill head tip 3 strikes the ring insert 4 after sufficient compression of the compression spring.

Claims (8)

  1. Ram boring device for boring in the ground, having at least one housing section for an impact piston (2), wherein, preceding the impact piston (2), a ring insert (4) is arranged in the housing (1) in such a way that it transfers at least a part of the energy of the impact piston (2) to the housing, characterised in that the ring insert (4) is retained by means of a shrink joint.
  2. Ram boring device according to claim 1, wherein the section in which the ring insert (4) is inserted is designed such that the inner contour of the section is smaller than the outer contour of the ring insert (4) at the same temperature as that of the ring insert (4) without the ring insert (4) being arranged in the section.
  3. Ram boring device according to either of claims 1 to 2, wherein the section in which the ring insert (4) is arranged has a circular diameter.
  4. Ram boring device according to any one of claims 1 to 3, wherein the ring insert (4) has a through opening for a bore head tip (3) and a base surface of a conically tapering cavity.
  5. Ram boring device according to any one of claims 1 to 4, wherein the ring insert (4) is arranged as the end face in a housing section for a bore head tip (3) and is inserted before the housing section for the impact piston (2).
  6. Ram boring device according to any one of claims 1 to 5, characterised in that the ring insert (4) is made of a material different from that of the housing (1).
  7. Ram boring device according to any one of claims 1 to 6, characterised in that the material of the ring insert (4) is heat treated.
  8. Method for producing a ram boring device for boring in the ground, wherein a ring insert (4) is inserted in a housing section preceding a section for an impact piston in such a way that it transfers at least a part of the energy of the impact piston (2) to the housing, characterised in that a shrink joint is produced between ring insert (4) and the section.
EP15812946.0A 2014-11-04 2015-11-04 Drilling ram device Active EP3215704B1 (en)

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US20170334052A1 (en) 2017-11-23
DE102014016154A1 (en) 2016-05-04
AU2015342237B2 (en) 2018-08-23
AU2015342237A1 (en) 2017-06-01
EP3215704A1 (en) 2017-09-13
PL3215704T3 (en) 2019-02-28
WO2016070987A1 (en) 2016-05-12
US10828763B2 (en) 2020-11-10

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