EP0362481B1 - Boring ram - Google Patents

Boring ram Download PDF

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Publication number
EP0362481B1
EP0362481B1 EP89111905A EP89111905A EP0362481B1 EP 0362481 B1 EP0362481 B1 EP 0362481B1 EP 89111905 A EP89111905 A EP 89111905A EP 89111905 A EP89111905 A EP 89111905A EP 0362481 B1 EP0362481 B1 EP 0362481B1
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EP
European Patent Office
Prior art keywords
housing
intermediate piece
boring machine
ram boring
machine according
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Expired - Lifetime
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EP89111905A
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German (de)
French (fr)
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EP0362481A3 (en
EP0362481A2 (en
Inventor
Alfons Dipl.-Ing. Hesse
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Schmidt Paul Dipl-Ing
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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
    • 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

Definitions

  • the invention relates to a ram boring device with a control tube which is axially movable in a housing and is controlled in its movement by a control tube which is connected by a compressed air hose and is held in an elastic intermediate piece in the housing by radial projections.
  • a ram boring machine of this type has become known from French patent specification 2,074,859.
  • the elastic intermediate piece is fastened in an outer sleeve by means of radial projections, and this sleeve is screwed into the housing of the ram boring machine.
  • the screw connection particularly when loosening after the device has been in operation for a while, presents considerable difficulties, not least due to the adverse, dirt-promoting influences when drilling holes in the ground, and the large ones, which reach up to 450 mm in diameter Devices increase. So that the screw connection does not loosen or loosen due to the vibrations, the screw parts are usually provided with a sensitive fine thread and, in addition, are often additionally glued together. When removing the block, this bond must then be released by heating at least the threaded sections of the screw parts, so that heat-related damage to the damping block cannot be ruled out.
  • ram boring machines have a head tube screwed into the rear end of the housing.
  • the head tube is either in one piece and has an end piece with an external thread that has axial air outlet openings that run concentrically to the head tube, or the end piece is a part that is separate from the head tube and that is screwed onto the rear end of the head tube and together with the head tube into the housing end is screwed in.
  • the threads of these devices are also provided with a metal adhesive before screwing in.
  • the machine housing must also be heated in the threaded area and the adhesive connection must be destroyed. Then the screw connection can be made using a suitable wrench and, if necessary Loosen additional strong hammer blows and unscrew.
  • This type of connection of the head tube to the housing has various disadvantages.
  • the head tube must be centered in the axial direction with respect to the machine housing and the percussion piston in order to avoid leaks between the percussion piston and the head tube as well as jamming and excessive wear between the head tube and the percussion piston.
  • this is difficult to achieve with non-centered threaded connections.
  • the described disassembly of the head tube often leads to damage to the intermediate piece and the housing. Due to the rigid connection between the housing, the intermediate piece and the head tube, the vibrations and shocks caused by the rapid piston strokes are transmitted undamped to the head tube and the connection to the compressed air hose. Long periods of use and difficult operating conditions can cause vibrations to break, particularly in the rear area of the ram boring machine housing.
  • the compressed air hose can also detach from the head tube, so that it generally has to be permanently connected to the head tube by means of a compression sleeve.
  • the invention has for its object to avoid the aforementioned disadvantages of known ram boring machines and in particular to improve the installation and removal of an elastic intermediate piece or suspension block together with the control of the ram boring machine and also to keep blows and vibrations away from the compressed air hose.
  • the elastic intermediate piece in the housing by a front, radial, circumferential housing projection and by a rear, in a groove in the housing locking ring is held so that threads for attaching the intermediate piece on the housing and the head tube are not required.
  • the intermediate piece is easy to assemble and only needs to be inserted into the housing.
  • the elasticity of the intermediate piece is sufficient and ensures that the head of the head tube adapts to the percussion piston; an exact axial alignment of the head tube is no longer necessary.
  • a pressure plate can be arranged between the intermediate piece and the locking ring.
  • the pressure plate In the case of an advantageous multi-part locking ring, it is recommended to provide the pressure plate with a locking edge. Especially when installing a multi-part, i.e. The securing edge, which consists of at least two ring segments, prevents the ring from falling inwards.
  • the locking ring can be of any cross-section, but advantageously round.
  • the intermediate piece can consist of an elastomer ring with axial air outlet openings; it can easily be pushed over the circumferential locking projection on the head tube.
  • the compressed air hose can advantageously be attached to the control tube by means of a screw coupling. Overall, the ram boring machine has a longer service life.
  • the rear end of the ram boring machine consists of a housing 1 in which a percussion piston 2 moves back and forth.
  • the percussion piston movement is controlled by means of a control tube 3, to which compressed air is supplied via a compressed air hose 6.
  • the control tube 3 is connected to the housing 1 by means of an intermediate piece 4.
  • the intermediate piece 4 consists of an elastic material, e.g. Rubber or polyurethane, and prevents the impacts and vibrations transmitted by the percussion piston 2 to the housing 1 from reaching the control tube 3 and the compressed air hose 6 without damping.
  • the compressed air supplied through a bore in the control tube 3 escapes into the atmosphere after the working strokes of the percussion piston 2 via axial air outlet openings 5 of the intermediate piece 4 which run concentrically to the control tube 3.
  • the compressed air hose 6 is connected to the control tube 3 by means of a screw coupling 7.
  • the intermediate piece 4 is fixed on the head tube 3 by a front, radial, circumferential projection 10 and a rear, radial, circumferential projection 11 in the axial direction. In a similar manner, the intermediate piece 4 is fixed in the rear end of the housing 1. This is because the housing 1 has an analog, front, radial, circumferential projection 12.
  • a sufficiently elastic intermediate piece 4 which is connected to the housing 1 and the control tube 3 by insertion into the latching projections, allows the intermediate piece 4 to slide over the rear end of the head tube 3 until it is held between the projections 10, 11.
  • the intermediate piece 4 has an inner and an outer metal sleeve 8, 9, for example fastened by vulcanization. These metal sleeves 8, 9 support the secure axial seating of the intermediate piece 4 relative to the housing 1 and the control tube 3.
  • an elastic securing ring 14 inserted after the insertion of the intermediate piece 4 Groove 15 of the housing 1. This retaining ring 14 can be removed again with the intermediate piece 4 for dismantling the head tube 3.
  • the locking ring 16 has a round cross section, and a pressure plate 17 is arranged between the locking ring 16 and the intermediate piece 4, which ensures a flat contact with the intermediate piece 4.
  • the pressure plate 17 is provided with a locking edge, which prevents the possibly multi-part locking ring 16 after it is assembled radially, i.e. collapses inside.

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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)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Description

Die Erfindung betrifft ein Rammbohrgerät mit einem in einem Gehäuse axial beweglichen, in seiner Bewegung durch ein mit einem Druckluftschlauch verbundenes, in einem im Gehäuse angeordneten elastischen Zwischenstück durch radiale Vorsprünge gehaltenes Steuerrohr gesteuerten Schlagkolben.The invention relates to a ram boring device with a control tube which is axially movable in a housing and is controlled in its movement by a control tube which is connected by a compressed air hose and is held in an elastic intermediate piece in the housing by radial projections.

Ein Rammbohrgerät dieser Art ist durch die französische Patentschrift 2 074 859 bekanntgeworden. Das elastische Zwischenstück ist in einer äußeren Hülse mittels radialer Vorsprünge befestigt, und diese Hülse ist in das Gehäuse des Rammbohrgeräts eingeschraubt.A ram boring machine of this type has become known from French patent specification 2,074,859. The elastic intermediate piece is fastened in an outer sleeve by means of radial projections, and this sleeve is screwed into the housing of the ram boring machine.

Ein weiteres, ähnliches Rammbohrgerät mit einem elastischen Zwischenstück ist durch die US-PS 3 995 702 bekanntgeworden. Das elastische Zwischenstück wirkt dort als Dämpfungsblock und nimmt beim Betrieb des Gerätes unvermeidliche Erschütterungen und Vibrationen auf; diese Einflüsse sollen weitestgehend von der Umsteuerung ferngehalten werden. Die Montage, d.h. der Ein- und Ausbau dieses Dämpfungsblockes setzt allerdings aufwendige Handhabungen voraus und bringt erhebliche Nachteile mit sich, denn der ringartige Dämpfungsblock wird zwischen einer auf das Steuerrohr aufgeschraubten Hülse und einem in das rückwärtige Ende des Gerätegehäuses eingeschraubten Endstück aufgenommen und in seiner Einbaulage gesichert. Somit müssen sowohl der Dämpfungsblock als auch das Endstück und die Hülse mit Gewinde versehen werden, was einen zusätzlichen Fertigungsaufwand voraussetzt. Abgesehen davon bereitet die Verschraubung insbesondere beim Lösen, nachdem das Gerät eine Zeit im Betrieb war, erhebliche Schwierigkeiten, die nicht zuletzt auf die widrigen, Verschmutzungen begünstigenden Einflüsse beim Herstellen von Bohrungen im Erdreich zurückzuführen sind, und bei den großen, bis 450 mm Durchmesser reichenden Geräten noch zunehmen. Damit sich die Verschraubung aufgrund der Vibrationen nicht lockert bzw. löst, werden die Schraubteile in der Regel mit einem empfindlichen Feingewinde versehen und außerdem häufig noch zusätzlich miteinander verklebt. Beim Ausbau des Blockes muß diese Verklebung dann durch Erwärmen zumindest der Gewindeabschnitte der Schraubteile gelöst werden, so daß hitzebedingte Beschädigungen des Dämpfungsblockes nicht auszuschließen sind.Another, similar ram boring machine with an elastic intermediate piece has become known from US Pat. No. 3,995,702. The elastic intermediate piece acts as a damping block and absorbs inevitable shocks and vibrations when the device is in operation; these influences should be kept as far as possible from the reversal. The assembly, ie the installation and removal of this damping block, however, requires complex handling and has considerable disadvantages, because the ring-like damping block is screwed between a sleeve screwed onto the head tube and one screwed into the rear end of the device housing End piece picked up and secured in its installed position. Thus, both the damping block and the end piece and the sleeve must be threaded, which requires additional manufacturing effort. Apart from this, the screw connection, particularly when loosening after the device has been in operation for a while, presents considerable difficulties, not least due to the adverse, dirt-promoting influences when drilling holes in the ground, and the large ones, which reach up to 450 mm in diameter Devices increase. So that the screw connection does not loosen or loosen due to the vibrations, the screw parts are usually provided with a sensitive fine thread and, in addition, are often additionally glued together. When removing the block, this bond must then be released by heating at least the threaded sections of the screw parts, so that heat-related damage to the damping block cannot be ruled out.

Andere bekannte Rammbohrgeräte weisen ein in das hintere Ende des Gehäuses eingeschraubtes Steuerrohr auf. Das Steuerrohr ist entweder einstückig und besitzt ein Endstück mit Außengewinde, das axiale, konzentrisch zum Steuerrohr verlaufende Luftaustrittsöffnungen aufweist, oder aber das Endstück ist ein vom Steuerrohr getrenntes Teil, das auf das hintere Ende des Steuerrohrs aufgeschraubt ist und zusammen mit dem Steuerrohr in das Gehäuseende eingeschraubt wird. Damit sich das Endstück nicht vom Steuerrohr bzw. vom Gehäuse löst, werden auch bei diesen Geräten die Gewinde vor dem Einschrauben mit einem Metallkleber versehen. Zum Ausbau des Endstückes muß hierbei das Maschinengehäuse ebenfalls im Gewindebereich erwärmt und damit die Klebeverbindung zerstört werden. Anschließend läßt sich die Verschraubung mit Hilfe entsprechender Schraubschlüssel und gegebenenfalls zusätzlicher starker Hammerschläge lösen und herausschrauben. Diese Art der Verbindung des Steuerrohrs mit dem Gehäuse weist verschiedene Nachteile auf.Other known ram boring machines have a head tube screwed into the rear end of the housing. The head tube is either in one piece and has an end piece with an external thread that has axial air outlet openings that run concentrically to the head tube, or the end piece is a part that is separate from the head tube and that is screwed onto the rear end of the head tube and together with the head tube into the housing end is screwed in. So that the end piece does not come loose from the head tube or the housing, the threads of these devices are also provided with a metal adhesive before screwing in. To remove the end piece, the machine housing must also be heated in the threaded area and the adhesive connection must be destroyed. Then the screw connection can be made using a suitable wrench and, if necessary Loosen additional strong hammer blows and unscrew. This type of connection of the head tube to the housing has various disadvantages.

Das Steuerrohr muß mit Bezug auf das Maschinengehäuse und den Schlagkolben genau zentrisch in Achsrichtung verlaufend befestigt werden, um Undichtigkeiten zwischen dem Schlagkolben und dem Steuerrohr sowie ein Klemmen und übermäßige Abnutzung zwischen dem Steuerrohr und dem Schlagkolben zu vermeiden. Dies ist jedoch mit nicht zentrierenden Gewindeverbindungen nur schwierig zu erreichen. Des weiteren führt die beschriebene Demontage des Steuerrohrs häufig zu Beschädigungen des Zwischenstücks und des Gehäuses. Aufgrund der starren Verbindung zwischen dem Gehäuse, dem Zwischenstück und dem Steuerrohr werden die durch die schnellen Kolbenschläge hervorgerufenen Schwingungen und Stöße ungedämpft auf das Steuerrohr und die Verbindung mit dem Druckluftschlauch übertragen. Bei längerem Einsatz und schwierigen Einsatzbedingungen können Schwingungsbrüche auftreten, insbesondere im hinteren Bereich des Gehäuses des Rammbohrgerätes. Auch kann sich der Druckluftschlauch vom Steuerrohr lösen, so daß dieser im allgemeinen mittels einer Verpreßhülse unlösbar mit dem Steuerrohr verbunden sein muß.The head tube must be centered in the axial direction with respect to the machine housing and the percussion piston in order to avoid leaks between the percussion piston and the head tube as well as jamming and excessive wear between the head tube and the percussion piston. However, this is difficult to achieve with non-centered threaded connections. Furthermore, the described disassembly of the head tube often leads to damage to the intermediate piece and the housing. Due to the rigid connection between the housing, the intermediate piece and the head tube, the vibrations and shocks caused by the rapid piston strokes are transmitted undamped to the head tube and the connection to the compressed air hose. Long periods of use and difficult operating conditions can cause vibrations to break, particularly in the rear area of the ram boring machine housing. The compressed air hose can also detach from the head tube, so that it generally has to be permanently connected to the head tube by means of a compression sleeve.

Der Erfindung liegt die Aufgabe zugrunde, die vorgenannten Nachteile bekannter Rammbohrgeräte zu vermeiden und insbesondere den Ein- und Ausbau eines elastischen Zwischenstücks bzw. Federungsblockes zusammen mit der Steuerung des Rammbohrgerätes zu verbessern sowie außerdem Schläge und Schwingungen auch vom Druckluftschlauch fernzuhalten.The invention has for its object to avoid the aforementioned disadvantages of known ram boring machines and in particular to improve the installation and removal of an elastic intermediate piece or suspension block together with the control of the ram boring machine and also to keep blows and vibrations away from the compressed air hose.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das elastische Zwischenstück im Gehäuse durch einen vorderen, radialen, umlaufenden Gehäusevorsprung und durch einen hinteren, in eine Nut im Gehäuse greifenden Sicherungsring gehalten ist, so daß Gewinde zum Befestigen des Zwischenstücks am Gehäuse und am Steuerrohr nicht erforderlich sind. Das Zwischenstück läßt sich leicht montieren und braucht lediglich in das Gehäuse eingeschoben zu werden. Die Elastizität des Zwischenstücks reicht aus und gewährleistet, daß sich der Kopf des Steuerrohrs dem Schlagkolben anpaßt; ein genaues axiales Ausrichten des Steuerrohrs ist damit nicht mehr nötig. Zwischen dem Zwischenstück und dem Sicherungsring kann eine Druckplatte angeordnet sein.This object is achieved in that the elastic intermediate piece in the housing by a front, radial, circumferential housing projection and by a rear, in a groove in the housing locking ring is held so that threads for attaching the intermediate piece on the housing and the head tube are not required. The intermediate piece is easy to assemble and only needs to be inserted into the housing. The elasticity of the intermediate piece is sufficient and ensures that the head of the head tube adapts to the percussion piston; an exact axial alignment of the head tube is no longer necessary. A pressure plate can be arranged between the intermediate piece and the locking ring.

Bei einem vorteilhaft mehrteiligen Sicherungsring empfiehlt es sich, die Druckplatte mit einer Sicherungskante zu versehen. Insbesondere beim Einbau eines mehrteiligen, d.h. aus zumindest zwei Ringsegmenten bestehenden Sicherungsringes verhindert die Sicherungskante, daß der Ring nach innen fällt. Der Sicherungsring kann von beliebigem Querschnitt, vorteilhaft jedoch rund sein.In the case of an advantageous multi-part locking ring, it is recommended to provide the pressure plate with a locking edge. Especially when installing a multi-part, i.e. The securing edge, which consists of at least two ring segments, prevents the ring from falling inwards. The locking ring can be of any cross-section, but advantageously round.

Das Zwischenstück kann aus einem Elastomer-Ring mit axialen Luftaustrittsöffnungen bestehen; es läßt sich leicht über den umlaufenden Rastvorsprung auf das Steuerrohr aufschieben.The intermediate piece can consist of an elastomer ring with axial air outlet openings; it can easily be pushed over the circumferential locking projection on the head tube.

Da das Steuerrohr mit der Schlauchverbindung nicht mehr den starken Schlägen und Schwingungen des Gehäuses ausgesetzt ist und keine Gefahr des selbsttätigen Lösens mehr besteht, läßt sich der Druckluftschlauch vorteilhaft mittels einer Schraubkupplung am Steuerrohr befestigen. Insgesamt ergibt sich eine längere Lebensdauer des Rammbohrgerätes.Since the control tube with the hose connection is no longer exposed to the strong impacts and vibrations of the housing and there is no longer any risk of automatic loosening, the compressed air hose can advantageously be attached to the control tube by means of a screw coupling. Overall, the ram boring machine has a longer service life.

Die Erfindung wird nachstehend anhand von in der Zeichnung dargestellten Ausführungsbeispielen des näheren erläutert. In der Zeichnung zeigen:

Fig. 1
im Längsschnitt eine Ausführung eines erfindungsgemäßen Rammbohrgerätes und
Fig. 2
im Längsschnitt eine weitere Ausführung des erfindungsgemäßen Rammbohrgerätes.
The invention is explained below with reference to exemplary embodiments shown in the drawing. The drawing shows:
Fig. 1
in longitudinal section an embodiment of a ram boring machine according to the invention and
Fig. 2
in longitudinal section a further embodiment of the ram boring machine according to the invention.

Von dem Rammbohrgerät ist jeweils nur das rückwärtige Ende dargestellt. Es besteht aus einem Gehäuse 1, in dem sich ein Schlagkolben 2 hin- und herbewegt. Die Schlagkolbenbewegung wird mittels eines Steuerrohres 3 gesteuert, dem Druckluft über einen Druckluftschlauch 6 zugeführt wird. Das Steuerrohr 3 ist mittels eines Zwischenstücks 4 mit dem Gehäuse 1 verbunden. Das Zwischenstück 4 besteht aus einem elastischen Material, z.B. Gummi oder Polyurethan, und verhindert, daß die durch den Schlagkolben 2 auf das Gehäuse 1 übertragenen Schläge und Schwingungen ungedämpft auf das Steuerrohr 3 und den Druckluftschlauch 6 gelangen. Die durch eine Bohrung im Steuerrohr 3 zugeführte Druckluft entweicht nach den Arbeitshüben des Schlagkolbens 2 über axiale, konzentrisch zum Steuerrohr 3 verlaufende Luftaustrittsöffnungen 5 des Zwischenstücks 4 in die Atmosphäre. Der Druckluftschlauch 6 ist mit dem Steuerrohr 3 mittels einer Schraubkupplung 7 verbunden.Only the rear end of the ram boring machine is shown. It consists of a housing 1 in which a percussion piston 2 moves back and forth. The percussion piston movement is controlled by means of a control tube 3, to which compressed air is supplied via a compressed air hose 6. The control tube 3 is connected to the housing 1 by means of an intermediate piece 4. The intermediate piece 4 consists of an elastic material, e.g. Rubber or polyurethane, and prevents the impacts and vibrations transmitted by the percussion piston 2 to the housing 1 from reaching the control tube 3 and the compressed air hose 6 without damping. The compressed air supplied through a bore in the control tube 3 escapes into the atmosphere after the working strokes of the percussion piston 2 via axial air outlet openings 5 of the intermediate piece 4 which run concentrically to the control tube 3. The compressed air hose 6 is connected to the control tube 3 by means of a screw coupling 7.

Das Zwischenstück 4 ist auf dem Steuerrohr 3 durch einen vorderen, radialen, umlaufenden Vorsprung 10 und einen hinteren, radialen, umlaufenden Vorsprung 11 in axialer Richtung festgelegt. Auf ähnliche Weise wird das Zwischenstück 4 im rückwärtigen Ende des Gehäuses 1 festgelegt. Das Gehäuse 1 weist nämlich analog einen vorderen, radialen, umlaufenden Vorsprung 12 auf.The intermediate piece 4 is fixed on the head tube 3 by a front, radial, circumferential projection 10 and a rear, radial, circumferential projection 11 in the axial direction. In a similar manner, the intermediate piece 4 is fixed in the rear end of the housing 1. This is because the housing 1 has an analog, front, radial, circumferential projection 12.

Ein ausreichend elastisches, mit dem Gehäuse 1 und dem Steuerrohr 3 durch Einsetzen in die Rastvorsprünge verbundenes Zwischenstück 4 erlaubt es, das Zwischenstück 4 über das hintere Ende des Steuerrohrs 3 zu schieben, bis es zwischen den Vorsprüngen 10, 11 festgehalten wird.A sufficiently elastic intermediate piece 4, which is connected to the housing 1 and the control tube 3 by insertion into the latching projections, allows the intermediate piece 4 to slide over the rear end of the head tube 3 until it is held between the projections 10, 11.

Bei der in Fig. 1 dargestellten Ausführung weist das Zwischenstück 4 eine innere und eine äußere, beispielsweise durch Vulkanisieren befestigte Metallhülse 8, 9 auf. Diese Metallhülsen 8, 9 unterstützen den sicheren axialen Sitz des Zwischenstücks 4 gegenüber dem Gehäuse 1 und dem Steuerrohr 3. Um das Zwischenstück 4 leicht ein- und ausbauen zu können, befindet sich ein elastischer, nach dem Einschieben des Zwischenstücks 4 eingesetzter Sicherungsring 14 in einer Nut 15 des Gehäuses 1. Dieser Sicherungsring 14 läßt sich zum Demontieren des Steuerrohrs 3 mit dem Zwischenstück 4 wieder herausnehmen.In the embodiment shown in FIG. 1, the intermediate piece 4 has an inner and an outer metal sleeve 8, 9, for example fastened by vulcanization. These metal sleeves 8, 9 support the secure axial seating of the intermediate piece 4 relative to the housing 1 and the control tube 3. In order to be able to easily install and remove the intermediate piece 4, there is an elastic securing ring 14 inserted after the insertion of the intermediate piece 4 Groove 15 of the housing 1. This retaining ring 14 can be removed again with the intermediate piece 4 for dismantling the head tube 3.

Im Ausführungsbeispiel gemäß Fig. 2 weist der Sicherungsring 16 einen runden Querschnitt auf, und zwischen dem Sicherungsring 16 und dem Zwischenstück 4 ist eine Druckplatte 17 angeordnet, die ein flächiges Anliegen am Zwischenstück 4 gewährleistet. Die Druckplatte 17 ist mit einer Sicherungskante versehen, die verhindert, daß der gegebenenfalls mehrteilige Sicherungsring 16 nach seiner Montage radial, d.h. nach innen zusammenfällt.In the exemplary embodiment according to FIG. 2, the locking ring 16 has a round cross section, and a pressure plate 17 is arranged between the locking ring 16 and the intermediate piece 4, which ensures a flat contact with the intermediate piece 4. The pressure plate 17 is provided with a locking edge, which prevents the possibly multi-part locking ring 16 after it is assembled radially, i.e. collapses inside.

Claims (7)

  1. A ram boring machine having a striking piston (2) that moves axially in a housing (1) and whose movements are controlled by a control pipe (3), connected to a compressed air hose (6), that is held by means of radial projections in an elastic intermediate piece (4) arranged in the housing (1), characterised in that the intermediate piece (4) is retained in the housing (1) by a front radial projection (12) running round the housing and by a rear securing ring (14, 16) engaging in a groove (16) in the housing (1).
  2. A ram boring machine according to claim 1, characterised in that the securing ring (14, 16) consists of elastic material.
  3. A ram boring machine according to claim 1 or claim 2, characterised by having a pressure plate (17) between the intermediate piece (4) and the securing ring (16).
  4. A ram boring machine according to one or more of claims 1 to 3, characterised by having a multipart securing ring (14, 16).
  5. A ram boring machine according to one or more of claims 1 to 4, characterised in that the pressure plate (17) is provided with a securing edge (18).
  6. A ram boring machine according to one or more of claims 1 to 5, characterised in that the intermediate piece (4) comprises an elastomer ring with axial air outlet openings (5).
  7. A ram boring machine according to one or more of claims 1 to 6, characterised in that the compressed air hose (6) is secured to the control pipe (3) by means of a screw coupling (7).
EP89111905A 1988-10-05 1989-06-30 Boring ram Expired - Lifetime EP0362481B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3833882 1988-10-05
DE3833882A DE3833882C2 (en) 1988-10-05 1988-10-05 Ram drilling machine

Publications (3)

Publication Number Publication Date
EP0362481A2 EP0362481A2 (en) 1990-04-11
EP0362481A3 EP0362481A3 (en) 1991-01-30
EP0362481B1 true EP0362481B1 (en) 1994-03-16

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EP89111905A Expired - Lifetime EP0362481B1 (en) 1988-10-05 1989-06-30 Boring ram

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US (1) US5074364A (en)
EP (1) EP0362481B1 (en)
JP (1) JP2672369B2 (en)
DE (1) DE3833882C2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
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US5249634A (en) * 1990-12-10 1993-10-05 Industrial Engineering, Inc. Impact borer for embedding lines, anchoring cables, and sinking wells
DE4221471A1 (en) * 1992-06-30 1994-01-05 Tracto Technik Ram drilling machine
DE4231400C1 (en) * 1992-09-19 1994-01-05 Tracto Technik Ram drilling machine
GB2313643A (en) * 1996-05-31 1997-12-03 Inst Gornogo Dela Sibirskogo O Apparatus for impact action
DE19650014C2 (en) * 1996-12-03 2002-04-11 Tracto Technik Ram boring machine
CA2194079C (en) * 1996-12-19 2005-11-29 Murray P. Craigmile Methods and apparatus for directionally drilling a bore and placing pipe
AU753171B2 (en) * 1998-07-08 2002-10-10 Tracto-Technik Paul Schmidt Spezialmaschinen Positive connection between a pipe and a ring inserted into the pipe
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Also Published As

Publication number Publication date
DE3833882C2 (en) 1996-07-04
EP0362481A3 (en) 1991-01-30
JPH02108786A (en) 1990-04-20
EP0362481A2 (en) 1990-04-11
DE3833882A1 (en) 1990-04-12
JP2672369B2 (en) 1997-11-05
US5074364A (en) 1991-12-24

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