EP0356666B1 - Boring ram for laying service lines without excavation - Google Patents

Boring ram for laying service lines without excavation Download PDF

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Publication number
EP0356666B1
EP0356666B1 EP89112633A EP89112633A EP0356666B1 EP 0356666 B1 EP0356666 B1 EP 0356666B1 EP 89112633 A EP89112633 A EP 89112633A EP 89112633 A EP89112633 A EP 89112633A EP 0356666 B1 EP0356666 B1 EP 0356666B1
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EP
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Prior art keywords
piston
housing
boring machine
ram boring
machine according
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EP89112633A
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German (de)
French (fr)
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EP0356666A2 (en
EP0356666A3 (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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring
    • E21B7/30—Enlarging drilled holes, e.g. by counterboring without earth removal
    • 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 machine for trenchless laying of supply lines in the ground with an impact piston which can be moved axially in a housing and is driven by a pressure medium via a supply hose connected from the front to the device housing.
  • Such a ram boring machine is described in the older, subsequently published European patent application 0 350 806.
  • a special design is required to achieve the pressure medium supply for this ram boring machine via a compressed air hose connected to the front of the device.
  • a control valve rigidly arranged inside the housing
  • an inner and an outer housing are required.
  • the inner housing is a conventional ram boring machine, to which the outer housing is attached, so that a special construction results.
  • a device has become known from European laid-open specification 0 190 933, which has an impact piston which can be axially displaced in a housing and is operated via a supply hose by means of a pressure medium.
  • the supply hose or hoses penetrating into the head of the device housing are connected to rigid pipes inside the housing.
  • the invention has for its object to design a ram boring machine so that with a supply hose connected to the front of the device housing, the pressurization of the percussion piston can be achieved with simple means, in particular without increasing the device diameter.
  • hose connection is arranged in the housing tip and the supply hose is connected to the percussion piston via a channel penetrating the end wall of the device housing in the longitudinal direction.
  • the device can be inserted more easily into an old pipe to be replaced or an earth channel.
  • the head piece be designed as a connecting piece that extends over the supply hose and tapers in the direction of advance.
  • the one-piece i.e.
  • a conical headpiece which transitions seamlessly into a nozzle or is provided with a screwed-in nozzle also offers protection of the supply hose which is enclosed by the nozzle on a part length corresponding to the length of the nozzle.
  • a percussion piston which is preferably stepped and has a piston extension which extends in the direction of advance and has a plurality of control openings corresponding to control openings fixed to the housing
  • the forward and return flow of the percussion piston can be controlled in such a way that the piston always faces the hose connector on the device housing and / or the tip of the device hits and releases its impact energy there.
  • a transverse bore arranged in a constricted central section of the piston extension can preferably be connected to a longitudinal bore opening into a working space behind the piston.
  • the control openings can be connected to one another by appropriate design of the control edges so that after a certain backward stroke of the percussion piston, the compressed air arrives behind the percussion piston and this in the direction of advance, i.e. accelerated forward again, and vice versa.
  • the supply hose can advantageously be fastened to a head tube, which is enclosed by a piston jacket of the percussion piston provided with control openings and extends with a continuous air channel into a piston bore.
  • a percussion piston located in its front end position when feeding Air through the central channel of the head tube first moved to the right, ie against the direction of advance, until the control openings of the piston skirt are connected to the piston bore. Then compressed air can get through the piston bore and the control openings behind the percussion piston and initiate another work cycle in the direction of advance.
  • the ram boring machine 1 has a housing 2 in which a percussion piston 3 is axially displaceably mounted.
  • the percussion piston 3 is designed as a stepped piston and has a main piston 4 and a piston extension 6, which has a smaller diameter and extends in the direction of advance 5 of the ram boring machine 1. In the position shown, the percussion piston 3 is in its front end position.
  • a compressed air hose 7 connected to a pressure medium source (compressor), not shown, by means of a Hose connection 8 attached.
  • a longitudinal bore 10 penetrating the front end wall 9 directs compressed air supplied via the compressed air hose 7 to the end face of the piston extension 6; this is provided with an air grooves 11 (see FIG. 2) which has a circumferentially distributed control head 12. Due to the compressed air acting on the end face of the control head 12, the percussion piston 3 moves against the direction of advance 5, ie to the right, the air enclosed in a working space 13 behind the main piston 4 escaping to the rear via air openings 14 until control edges 15 of the air grooves 11 ( see FIG.
  • the working space 13 is bounded at the rear by a cover 21 screwed onto the rear end of the housing. As soon as a pressure exceeding the counter pressure has built up in the working space 13, the percussion piston 3 is accelerated back into its position shown, the air escaping to the rear via the air openings 22 in front of the main piston 4.
  • the front end of the ram boring machine 1 is provided with an insertion cone 23 and, in addition, a screwed socket 24 tapering in the direction of advance 5 and extending the insertion cone 23 in a funnel-like manner.
  • the nozzle 24 extends over a partial length of the compressed air hose 7 and thus represents a hose protector.
  • a pulling cable 25 inserted between the connecting piece 24 and the insertion cone 23 and screwed in before the connecting piece 24 is used serves to guide the ram boring machine 1 which moves through an old pipe (not shown) or an earth channel (not shown); the pull cable 25 can be pulled in a target pit, for example by a winch, so that the feed of the ram boring machine 1 can also be increased.
  • a widening socket 26 which tapers conically in the direction of advance 5, is pushed onto the housing 2 and extends with a jacket 27 to the rear beyond the rear end of the ram boring machine 1.
  • a tube can be pushed between the jacket 27 and the device housing 2 and pulled into the ground with the advance of the ram boring machine 1.
  • a pressure medium hose 107 with a hose connection 108 is attached to a control tube 28 fixed in the housing 102 at the front end of the housing 102.
  • the end of the control tube 29 facing away from the hose connection 108 is designed as a head piece 29 which engages flush in a piston bore 30 of a percussion piston 103.
  • the compressed air hose 107 is connected to the piston bore 30 via an air duct 31 which penetrates the control tube 28 centrally.
  • the piston jacket 32 sliding over or on the head tube 29 has radial control openings 33 which merge into axial air channels 34; the channels 34 lead to air grooves 111, shown in broken lines, of the percussion piston 103.
  • the piston bore 30 builds up Due to the air supplied via the compressed air hose 107 and the air channel 31, the percussion piston 103 progressively further into the closed working space 113, ie pressure moving to the right.
  • the control openings 33 are designed so that the air from the working space 113 behind the piston 103 via the air grooves 111, the axial air channels 34 and the control openings 33 freely reach vent holes 35 in the front end wall 109 of the ram boring machine 101 and escape there into the atmosphere can.
  • a conical head piece 38 which extends over the compressed air hose 107 in the direction of advance 105 and which represents an insertion cone which is integral with a connecting piece.
  • a traction cable 125 is enclosed between the head piece 38 and the front end of the housing 102.
  • an expansion socket 126 with a jacket 127 extending beyond the rear end of the ram boring machine 101 is pushed onto the device housing 102.

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

Description

Die Erfindung betrifft ein Rammbohrgerät zum grabenlosen Verlegen von Versorgungsleitungen im Erdreich mit einem in einem Gehäuse axial verschiebbaren, über einen von vorne an das Gerätegehäuse angeschlossenen Versorgungsschlauch mittels eines Druckmediums betriebenen Schlagkolben.The invention relates to a ram boring machine for trenchless laying of supply lines in the ground with an impact piston which can be moved axially in a housing and is driven by a pressure medium via a supply hose connected from the front to the device housing.

Ein derartiges Rammbohrgerät ist in der älteren, nachveröffentlichten europäischen Offenlegungsschrift 0 350 806 beschrieben. Um bei diesem Rammbohrgerät die Druckmittelversorgung über einen vorne am Gerät angeschlossenen Druckluftschlauch zu erreichen, ist eine spezielle Bauweise erforderlich. So sind, um die Druckluft zu einem im Gehäuseinneren starr angeordneten Steuerventil führen zu können, ein Innen- und ein Außengehäuse erforderlich. Zwischen den Gehäusen befindet sich ein Ringspalt, durch den die Druckluft weitergeleitet und anschließend über radiale Luftdurchtrittsöffnungen in der Außenwand des Innengehäuses umgelenkt wird, so daß sie radial von der Seite her in das Steuerventil eindringt. Bei dem Innengehäuse handelt es sich um ein übliches Rammbohrgerät, dem das Außengehäuse aufgesetzt ist, so daß sich eine spezielle Bauweise ergibt. Abgesehen von dem großen Aufwand, den die Herstellung und der Ineinanderbau zweier Gehäuse erfordern, geht damit unweigerlich eine - weiterhin auch noch durch den Ringspalt beeinflußte - Vergrößerung des Gesamtdurchmessers des Rammbohrgerätes einher. Dieses bekannte Rammbohrgerät ist somit für Anwendungsfälle nicht geeignet, bei denen die Rohrabmessungen einen bestimmten Mindestdurchmesser des Gerätes voraussetzen.Such a ram boring machine is described in the older, subsequently published European patent application 0 350 806. A special design is required to achieve the pressure medium supply for this ram boring machine via a compressed air hose connected to the front of the device. In order to be able to guide the compressed air to a control valve rigidly arranged inside the housing, an inner and an outer housing are required. There is an annular gap between the housings through which the compressed air is passed on and then deflected via radial air passage openings in the outer wall of the inner housing, so that it penetrates radially from the side into the control valve. The inner housing is a conventional ram boring machine, to which the outer housing is attached, so that a special construction results. Apart from the great effort that the production and the The need to fit two housings into one another is inevitably accompanied by an increase in the overall diameter of the ram boring machine, which is also influenced by the annular gap. This known ram boring machine is therefore not suitable for applications in which the pipe dimensions require a certain minimum diameter of the device.

Wenngleich nicht für ein Rammbohrgerät, so doch auch zum grabenlosen Verlegen von Versorgungsleitungen im Erdreich ist durch die europäische Offenlegungsschrift 0 190 933 ein Gerät bekanntgeworden, das einen in einem Gehäuse axial verschiebbaren, über einen Versorgungsschlauch mittels eines Druckmediums betriebenen Schlagkolben aufweist. Der bzw. die kopfseitig in das Gerätegehäuse eindringenden Versorgungsschläuche sind an starre Rohrleitungen im Gehäuseinneren angeschlossen.Although not for a ram boring machine, but also for the trenchless laying of supply lines in the ground, a device has become known from European laid-open specification 0 190 933, which has an impact piston which can be axially displaced in a housing and is operated via a supply hose by means of a pressure medium. The supply hose or hoses penetrating into the head of the device housing are connected to rigid pipes inside the housing.

Der Erfindung liegt die Aufgabe zugrunde, ein Rammbohrgerät so auszugestalten, daß sich bei einem vorne am Gerätegehäuse angeschlossenen Versorgungsschlauch die Druckbeaufschlagung des Schlagkolbens mit einfachen Mitteln, insbesondere ohne den Gerätedurchmesser zu vergrößern, erreichen läßt.The invention has for its object to design a ram boring machine so that with a supply hose connected to the front of the device housing, the pressurization of the percussion piston can be achieved with simple means, in particular without increasing the device diameter.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Schlauchanschluß in der Gehäusespitze angeordnet ist und der Versorgungsschlauch mit dem Schlagkolben über einen die Stirnwand des Gerätegehäuses in Längsrichtung durchdringenden Kanal in Verbindung steht. Damit läßt sich eine mittige Druckmittelzufuhr erreichen, so daß ein herkömmliches Rammbohrgerät oder eine Schlagramme ohne Durchmesservergrößerung verwendet werden kann; insbesondere ist kein die Herstellung und die Montage sowie die Geräteabmessungen erhöhender Freiraum zwischen dem Gerätegehäuse und einem Außengehäuse erforderlich.This object is achieved in that the hose connection is arranged in the housing tip and the supply hose is connected to the percussion piston via a channel penetrating the end wall of the device housing in the longitudinal direction. This allows a central pressure medium supply to be achieved, so that a conventional ram boring machine or a hammer can be used without increasing the diameter; in particular, there is no need for a free space between the device housing and an outer housing, which increases the manufacture and assembly, and the device dimensions.

Bei einem Rammbohrgerät mit einem konischen Kopfstück am vortriebsseitigen Gehäuseende ergibt sich ein einfacheres Einführen des Gerätes in ein zu erneuerndes Altrohr oder einen Erdkanal.In the case of a ram boring machine with a conical head piece at the end of the housing on the jacking side, the device can be inserted more easily into an old pipe to be replaced or an earth channel.

Es empfiehlt sich, daß das Kopfstück als ein den Versorgungsschlauch übergreifender, sich in Vortriebsrichtung verjüngender Stutzen ausgebildet ist. Das entweder einstückige, d.h. übergangslos in einen Stutzen übergehende, oder mit einem eingeschraubten Stutzen versehene konische Kopfstück bietet dann neben verbesserten Führungseigenschaften außerdem einen Schutz des Versorgungsschlauches, der auf einer der Länge des Stutzens entsprechenden Teillänge von dem Stutzen umschlossen wird.It is recommended that the head piece be designed as a connecting piece that extends over the supply hose and tapers in the direction of advance. The one-piece, i.e. In addition to improved guiding properties, a conical headpiece which transitions seamlessly into a nozzle or is provided with a screwed-in nozzle also offers protection of the supply hose which is enclosed by the nozzle on a part length corresponding to the length of the nozzle.

Mit einem Schlagkolben, der vorzugsweise gestuft ist und einen sich in Vortriebsrichtung erstreckenden, mehrere mit gehäusefesten Steueröffnungen korrespondierende Steueröffnungen aufweisenden Kolbenfortsatz besitzt, läßt sich der Vor- und Rücklauf des Schlagkolbens so steuern, daß der Kolben stets an seiner dem Schlauchanschluß zugewandten Seite auf das Gerätegehäuse und/oder die Gerätespitze auftrifft und dort seine Schlagenergie abgibt.With a percussion piston, which is preferably stepped and has a piston extension which extends in the direction of advance and has a plurality of control openings corresponding to control openings fixed to the housing, the forward and return flow of the percussion piston can be controlled in such a way that the piston always faces the hose connector on the device housing and / or the tip of the device hits and releases its impact energy there.

Hierbei kann vorzugsweise eine in einem eingeschnürten Mittelabschnitt des Kolbenfortsatzes angeordnete Querbohrung mit einer in einen Arbeitsraum hinter dem Kolben mündenden Längsbohrung verbunden sein. Auf diese Weise lassen sich die Steueröffnungen durch entsprechende Auslegung der Steuerkanten so miteinander verbinden, daß nach einem bestimmten Rückwärtshub des Schlagkolbens die Druckluft hinter den Schlagkolben gelangt und diesen in Vortriebsrichtung, d.h. erneut nach vorne beschleunigt, und umgekehrt.Here, a transverse bore arranged in a constricted central section of the piston extension can preferably be connected to a longitudinal bore opening into a working space behind the piston. In this way, the control openings can be connected to one another by appropriate design of the control edges so that after a certain backward stroke of the percussion piston, the compressed air arrives behind the percussion piston and this in the direction of advance, i.e. accelerated forward again, and vice versa.

Der Versorgungsschlauch läßt sich vorteilhaft an einem Steuerrohr befestigen, das von einem mit Steueröffnungen versehenen Kolbenmantel des Schlagkolbens umschlossen ist und mit einem durchgehenden Luftkanal bis in eine Kolbenbohrung reicht Auf diese Weise wird ein in seiner vorderen Endstellung befindlicher Schlagkolben beim Zuführen von Luft über den mittigen Kanal des Steuerrohres zunächst solange nach rechts, d.h. entgegen der Vortriebsrichtung bewegt, bis die Steueröffnungen des Kolbenmantels mit der Kolbenbohrung verbunden sind. Danach kann Druckluft über die Kolbenbohrung und die Steueröffnungen hinter den Schlagkolben gelangen und ein erneutes Arbeitsspiel in Vortriebsrichtung einleiten.The supply hose can advantageously be fastened to a head tube, which is enclosed by a piston jacket of the percussion piston provided with control openings and extends with a continuous air channel into a piston bore. In this way, a percussion piston located in its front end position when feeding Air through the central channel of the head tube first moved to the right, ie against the direction of advance, until the control openings of the piston skirt are connected to the piston bore. Then compressed air can get through the piston bore and the control openings behind the percussion piston and initiate another work cycle in the direction of advance.

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

Fig. 1
einen Längsschnitt durch ein Rammbohrgerät mit einem erfindungsgemäß vorne am Gerätekopf angeschlossenen Versorgungsschlauch,
Fig. 2
das Rammbohrgerät gemäß Fig. 1 entlang der Linie II-II geschnitten, und
Fig. 3
einen Längsschnitt durch eine andere Ausführung eines erfindungsgemäßen Rammbohrgerätes.
The invention is explained below with reference to exemplary embodiments shown in the drawing. Show it:
Fig. 1
2 shows a longitudinal section through a ram boring machine with a supply hose connected to the front of the device head according to the invention,
Fig. 2
1 along the line II-II, and
Fig. 3
a longitudinal section through another embodiment of a ram boring machine according to the invention.

Das Rammbohrgerät 1 besitzt ein Gehäuse 2, in dem ein Schlagkolben 3 axial verschiebbar gelagert ist. Der Schlagkolben 3 ist als Stufenkolben ausgebildet und besitzt einen Hauptkolben 4 und einen demgegenüber einen geringeren Durchmesser aufweisenden, sich in Vortriebsrichtung 5 des Rammbohrgerätes 1 erstreckenden Kolbenfortsatz 6. In der dargestellten Position befindet sich der Schlagkolben 3 in seiner vorderen Endlage.The ram boring machine 1 has a housing 2 in which a percussion piston 3 is axially displaceably mounted. The percussion piston 3 is designed as a stepped piston and has a main piston 4 and a piston extension 6, which has a smaller diameter and extends in the direction of advance 5 of the ram boring machine 1. In the position shown, the percussion piston 3 is in its front end position.

An seinem in Vortriebsrichtung 5 vorderen Ende des Gehäuses 2 ist ein mit einer nicht dargestellten Druckmittelquelle (Kompressor) verbundener Druckluftschlauch 7 mittels eines Schlauchanschlusses 8 befestigt. Eine die vordere Stirnwand 9 durchdringende Längsbohrung 10 leitet über den Druckluftschlauch 7 zugeführte Druckluft auf die Stirnfläche des Kolbenfortsatzes 6; dieser ist mit einem umfangsverteilt angeordnete Luftnuten 11 (vgl. Fig. 2) aufweisenden Steuerkopf 12 versehen. Aufgrund der auf die Stirnfläche des Steuerkopfs 12 einwirkenden Druckluft verschiebt sich der Schlagkolben 3 entgegen der Vortriebsrichtung 5, d.h. nach rechts, wobei die in einem Arbeitsraum 13 hinter dem Hauptkolben 4 eingeschlossene Luft über Luftöffnungen 14 nach hinten entweicht, bis Steuerkanten 15 der Luftnuten 11 (vgl. Fig. 1) korrespondierende Steuerkanten 16 radialer Steueröffnungen 17 des Gerätegehäuses 2 überschneiden. Es gelangt danach die von dem Schlauch 7 zugeführte Druckluft über die Nuten 11 des Steuerkopfes 12 und die gehäusefesten Steueröffnungen 17 in eine in einem eingeschnürten Mittelteil 18 des Kolbenfortsatzes 6 angeordnete Querbohrung 19 und über eine damit verbundene Längsbohrung 20 (die Bohrungen 19 und 20 sind in Fig. 1 gestrichelt dargestellt) in den Arbeitsraum 13 hinter dem Hauptkolben 4.At its front end of the housing 2 in the direction of advance 5 there is a compressed air hose 7 connected to a pressure medium source (compressor), not shown, by means of a Hose connection 8 attached. A longitudinal bore 10 penetrating the front end wall 9 directs compressed air supplied via the compressed air hose 7 to the end face of the piston extension 6; this is provided with an air grooves 11 (see FIG. 2) which has a circumferentially distributed control head 12. Due to the compressed air acting on the end face of the control head 12, the percussion piston 3 moves against the direction of advance 5, ie to the right, the air enclosed in a working space 13 behind the main piston 4 escaping to the rear via air openings 14 until control edges 15 of the air grooves 11 ( see FIG. 1) overlap corresponding control edges 16 of radial control openings 17 of the device housing 2. The compressed air supplied from the hose 7 then passes via the grooves 11 of the control head 12 and the control openings 17 fixed to the housing into a transverse bore 19 arranged in a constricted central part 18 of the piston extension 6 and via a longitudinal bore 20 connected to it (the bores 19 and 20 are in FIG 1 shown in dashed lines) in the working space 13 behind the main piston 4th

Der Arbeitsraum 13 wird hinten von einem auf das rückwärtige Gehäuseende geschraubten Deckel 21 begrenzt. Sobald sich im Arbeitsraum 13 ein den Gegendruck übersteigender Druck aufgebaut hat, wird der Schlagkolben 3 in seine dargestellte Lage zurückbeschleunigt, wobei die Luft vor dem Hauptkolben 4 über Luftöffnungen 22 nach hinten entweicht.The working space 13 is bounded at the rear by a cover 21 screwed onto the rear end of the housing. As soon as a pressure exceeding the counter pressure has built up in the working space 13, the percussion piston 3 is accelerated back into its position shown, the air escaping to the rear via the air openings 22 in front of the main piston 4.

Das vordere Ende des Rammbohrgerätes 1 ist mit einem Einführkonus 23 und außerdem einen sich in Vortriebsrichtung 5 verjüngenden, den Einführkonus 23 trichterartig verlängernden, eingeschraubten Stutzen 24 versehen. Der Stutzen 24 übergreift eine Teillänge des Druckluftschlauches 7 und stellt somit einen Schlauchschutz dar. Ein vor dem Aufschrauben des Stutzens 24 eingesetztes, zwischen dem Stutzen 24 und dem Einführkonus 23 festgelegtes Zugseil 25 dient zur Führung des sich durch ein nicht dargestelltes Altrohr oder einen nicht dargestellten Erdkanal bewegenden Rammbohrgerätes 1; das Zugseil 25 kann in einer Zielgrube beispielsweise von einer Winde gezogen werden, so daß sich außerdem der Vorschub des Rammbohrgerätes 1 erhöhen läßt. Weiterhin ist auf das Gehäuse 2 ein sich in Vortriebsrichtung 5 konisch verjüngender Aufweitstutzen 26 aufgeschoben, der sich mit einem Mantel 27 nach hinten bis über das rückwärtige Ende des Rammbohrgerätes 1 hinaus erstreckt. Zwischen Mantel 27 und Gerätegehäuse 2 läßt sich ein Rohr aufschieben und gleich mit dem Vortrieb des Rammbohrgerätes 1 in das Erdreich einziehen.The front end of the ram boring machine 1 is provided with an insertion cone 23 and, in addition, a screwed socket 24 tapering in the direction of advance 5 and extending the insertion cone 23 in a funnel-like manner. The nozzle 24 extends over a partial length of the compressed air hose 7 and thus represents a hose protector. A pulling cable 25 inserted between the connecting piece 24 and the insertion cone 23 and screwed in before the connecting piece 24 is used serves to guide the ram boring machine 1 which moves through an old pipe (not shown) or an earth channel (not shown); the pull cable 25 can be pulled in a target pit, for example by a winch, so that the feed of the ram boring machine 1 can also be increased. Furthermore, a widening socket 26, which tapers conically in the direction of advance 5, is pushed onto the housing 2 and extends with a jacket 27 to the rear beyond the rear end of the ram boring machine 1. A tube can be pushed between the jacket 27 and the device housing 2 and pulled into the ground with the advance of the ram boring machine 1.

Bei dem Rammbohrgerät 101 gemäß Fig. 3 ist am vorderen Ende des Gehäuses 102 ein Druckmittelschlauch 107 mit einem Schlauchanschluß 108 an ein im Gehäuse 102 festgelegtes Steuerrohr 28 befestigt. Das von dem Schlauchanschluß 108 abgewandte Ende des Steuerrohres 29 ist als Kopfstück 29 ausgebildet, das bündig in eine Kolbenbohrung 30 eines Schlagkolbens 103 eingreift. Der Druckluftschlauch 107 steht über einen das Steuerrohr 28 zentrisch durchdringenden Luftkanal 31 mit der Kolbenbohrung 30 in Verbindung. Der über das bzw. auf dem Steuerrohrkopfstück 29 gleitende Kolbenmantel 32 besitzt radiale Steueröffnungen 33, die in axiale Luftkanäle 34 übergehen; die Kanäle 34 führen zu umfangsverteilt angeordneten, gestrichelt dargestellten Luftnuten 111 des Schlagkolbens 103.3, a pressure medium hose 107 with a hose connection 108 is attached to a control tube 28 fixed in the housing 102 at the front end of the housing 102. The end of the control tube 29 facing away from the hose connection 108 is designed as a head piece 29 which engages flush in a piston bore 30 of a percussion piston 103. The compressed air hose 107 is connected to the piston bore 30 via an air duct 31 which penetrates the control tube 28 centrally. The piston jacket 32 sliding over or on the head tube 29 has radial control openings 33 which merge into axial air channels 34; the channels 34 lead to air grooves 111, shown in broken lines, of the percussion piston 103.

Zum Verstellen des Schlagkolbens 103 aus seiner dargestellten vorderen Endlage in die entgegen der Vortriebsrichtung 105 gerichtete Endlage baut sich in der Kolbenbohrung 30 aufgrund der über den Druckluftschlauch 107 und den Luftkanal 31 zugeführten Luft ein den Schlagkolben 103 zunehmend weiter in den abgeschlossenen Arbeitsraum 113, d.h. nach rechts bewegender Druck auf. Die Steueröffnungen 33 sind so ausgelegt, daß die Luft aus dem Arbeitsraum 113 hinter dem Kolben 103 über die Luftnuten 111, die axialen Luftkanäle 34 und die Steueröffnungen 33 ungehindert zu Entlüftungsbohrungen 35 in der vorderen Stirnwand 109 des Rammbohrgerätes 101 gelangen und dort in die Atmosphäre entweichen kann.In order to adjust the percussion piston 103 from its illustrated front end position into the end position directed against the direction of advance 105, the piston bore 30 builds up Due to the air supplied via the compressed air hose 107 and the air channel 31, the percussion piston 103 progressively further into the closed working space 113, ie pressure moving to the right. The control openings 33 are designed so that the air from the working space 113 behind the piston 103 via the air grooves 111, the axial air channels 34 and the control openings 33 freely reach vent holes 35 in the front end wall 109 of the ram boring machine 101 and escape there into the atmosphere can.

Sobald die in Vortriebsrichtung 105 gesehen hinteren Steuerkanten 36 der Steueröffnungen 33 des Kolbenmantels 32 die abschließende Stirnkante 37 des Steuerrohrkopfstückes 29 überschneiden, gelangt Druckluft aus der Kolbenbohrung 30 über die Steueröffnungen 33, die Luftkanäle 34 und die Luftnuten 111 hinter den Schlagkolben 103 in den Arbeitsraum 113. Es baut sich dort ein den Schlagkolben 103 schließlich wieder in Vortriebsrichtung 105 beschleunigender Druck auf. Sowohl die Zu- als auch die Abluft entweichen über die Entlüftungsbohrungen 35 am vorderen Ende des Gehäuses 102.As soon as the rear control edges 36 of the control openings 33 of the piston skirt 32, seen in the direction of advance 105, overlap the final end edge 37 of the head tube 29, compressed air passes from the piston bore 30 via the control openings 33, the air channels 34 and the air grooves 111 behind the percussion piston 103 into the working space 113 A pressure which accelerates the percussion piston 103 again in the direction of advance 105 builds up there. Both the supply and the exhaust air escape through the ventilation holes 35 at the front end of the housing 102.

Auf das vordere Ende des Gehäuses 102 ist ein den Druckluftschlauch 107 in Vortriebsrichtung 105 übergreifendes konisches Kopfstück 38 geschraubt, das einen mit einem Stutzen einstückigen Einführkonus darstellt. Zwischen dem Kopfstück 38 und dem vorderen Ende des Gehäuses 102 ist ein Zugseil 125 eingeschlossen. Auf das Gerätegehäuse 102 ist außerdem ein Aufweitstutzen 126 mit einem bis über das rückwärtige Ende des Rammbohrgerätes 101 hinaus reichenden Mantel 127 aufgeschoben.On the front end of the housing 102 is screwed a conical head piece 38 which extends over the compressed air hose 107 in the direction of advance 105 and which represents an insertion cone which is integral with a connecting piece. A traction cable 125 is enclosed between the head piece 38 and the front end of the housing 102. In addition, an expansion socket 126 with a jacket 127 extending beyond the rear end of the ram boring machine 101 is pushed onto the device housing 102.

Claims (6)

  1. A ram boring machine for laying service lines in the ground without need for excavation, having a striking piston axially displaceable in a housing and driven by a pressure medium via a supply hose connected to the housing from the front, wherein the hose connection (8, 108) is arranged in the tip (23, 24, 38) of the housing and the supply hose (7, 107) is in connection with the striking piston (3, 103) via a passage (10, 31) passing through the end wall (9, 109) of the housing (2, 102) longitudinally.
  2. A ram boring machine according to claim 1, characterised by the leading end of the housing having a conical head piece (23, 24; 38).
  3. A ram boring machine according to claim 1 or claim 2, characterised in that the head piece is in the form of a connecting piece (24) overlapping the supply hose and tapered in the direction of advance (5).
  4. A ram boring machine according to one or more of claims 1 to 3, characterised in that the striking piston (3) is stepped and has a piston extension (6) extending in the direction of advance (5) and having a plurality of control openings (11, 19, 20) corresponding to fixed control openings in the housing.
  5. A ram boring machine according to claim 4, characterised in that a transverse bore (19) in a necked middle section (18) of the piston extension (6) is connected to a longitudinal bore (20) opening into a working chamber (13) behind the piston (3).
  6. A ram boring machine according to one or more of claims 1 to 3, characterised in that the supply hose (107) is secured to a control pipe (28) that is surrounded by a piston skirt (32), provided with control openings (33, 34), of the striking piston (103) and has an air passage (31) extending into a bore (30) in the piston.
EP89112633A 1988-09-01 1989-07-11 Boring ram for laying service lines without excavation Revoked EP0356666B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3829628A DE3829628A1 (en) 1988-09-01 1988-09-01 RAMM DRILLING DEVICE FOR THE TRENCHLESS LAYING OF SUPPLY LINES
DE3829628 1988-09-01

Publications (3)

Publication Number Publication Date
EP0356666A2 EP0356666A2 (en) 1990-03-07
EP0356666A3 EP0356666A3 (en) 1991-01-30
EP0356666B1 true EP0356666B1 (en) 1993-10-13

Family

ID=6362029

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Application Number Title Priority Date Filing Date
EP89112633A Revoked EP0356666B1 (en) 1988-09-01 1989-07-11 Boring ram for laying service lines without excavation

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US (1) US4981181A (en)
EP (1) EP0356666B1 (en)
JP (1) JPH02101281A (en)
DE (1) DE3829628A1 (en)

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US5456552A (en) * 1993-05-27 1995-10-10 Martin D. Cherrington Method and apparatus for installing pipe in horizontal borehole
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CA2194079C (en) * 1996-12-19 2005-11-29 Murray P. Craigmile Methods and apparatus for directionally drilling a bore and placing pipe
US6799647B2 (en) 2001-12-06 2004-10-05 Ricky Clemmons Earth drilling and boring system
EP1483475A2 (en) * 2002-03-08 2004-12-08 Shell Internationale Researchmaatschappij B.V. Steerable soil penetration system
US7681658B2 (en) 2007-11-06 2010-03-23 Maurice DUVAL Pneumatic impact tool

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Also Published As

Publication number Publication date
US4981181A (en) 1991-01-01
EP0356666A2 (en) 1990-03-07
JPH02101281A (en) 1990-04-13
DE3829628C2 (en) 1990-08-16
EP0356666A3 (en) 1991-01-30
DE3829628A1 (en) 1990-03-15

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