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EP0263281B1 - Pneumatic boring ram - Google Patents

Pneumatic boring ram Download PDF

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Publication number
EP0263281B1
EP0263281B1 EP87112220A EP87112220A EP0263281B1 EP 0263281 B1 EP0263281 B1 EP 0263281B1 EP 87112220 A EP87112220 A EP 87112220A EP 87112220 A EP87112220 A EP 87112220A EP 0263281 B1 EP0263281 B1 EP 0263281B1
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EP
European Patent Office
Prior art keywords
ram boring
hollow cylinder
boring machine
compressed air
machine according
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.)
Expired - Lifetime
Application number
EP87112220A
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German (de)
French (fr)
Other versions
EP0263281A1 (en
Inventor
Paul Schmidt
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Individual
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Individual
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Publication date
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Priority to AT87112220T priority Critical patent/ATE57644T1/en
Publication of EP0263281A1 publication Critical patent/EP0263281A1/en
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Publication of EP0263281B1 publication Critical patent/EP0263281B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling by passing the exhaust gases through porous members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11—Arrangements of noise-damping means
    • B25D17/12—Arrangements of noise-damping means of exhaust silencers
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/002—Down-hole drilling fluid separation systems
    • 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
    • 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
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/205—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes without earth removal
    • E21B7/206—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes without earth removal using down-hole drives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S173/00—Tool driving or impacting
    • Y10S173/02—Sound muffling

Definitions

  • the invention relates to a pneumatic ram boring machine in which an axially reciprocated piston supplied with air by a compressed air line attached to the housing delivers its impact energy to the housing and / or its impact tip.
  • Such ram boring machines serve primarily to lay supply lines for water or electricity as well as telephone cables without having to tear open the road surface or the sidewalks. They usually have a percussion tip which is actuated by a pneumatically operated percussion piston. When the percussion tip is propelled, the percussion piston is moved back and forth in a tubular housing in that compressed air supplied through a compressed air line alternately acts on the front and rear foreheads of the percussion piston. Through openings in the rear end of the housing allow the exhaust air to exit into the earth channel created by the ram boring machine and from there to the outside.
  • ram boring machines also use lubricants such as e.g. Mineral oils or other additives are added. These additives are released as mist together with the exhaust air and pose a risk to operating personnel and the environment.
  • lubricants such as e.g. Mineral oils or other additives are added. These additives are released as mist together with the exhaust air and pose a risk to operating personnel and the environment.
  • the noise generated by most ram boring machines often exceeds the permanently harmful level of 90 dBA. This level is usually exceeded even with a ram boring machine that mainly works below the surface. In particular, if a pipe is pulled in at the same time as the ramming, considerable noise escapes because the pipe acts like a sound pipe.
  • both the compressed air directed into the muffler housing placed on the bolt-firing device and the refrigerant of the compressor flowing into the filter and damping housing are deflected radially at least once, in particular the compressed air of the bolt-firing unit being radial vented outside into the atmosphere.
  • both devices the problem of the axial supply and discharge of both compressed air and exhaust air is irrelevant when using a silencer and filter housing.
  • the invention has for its object to provide a ram boring machine which reduces some of the environmental impairments accompanying the operation of such compressed air devices.
  • an air-permeable hollow cylinder arranged in the exhaust air flow has a cylindrical passage, enveloped by a sound-absorbing and / or an oil-separating filling, for the compressed air and in its end faces opposite one another, the exhaust air coaxial with that centric passage and in countercurrent to the compressed air supplied axially through the filling exhaust air inlet holes and exhaust air outlet holes.
  • the air streams can flow axially through the hollow cylinder without deflection, so that there is an air passage which is only slightly damped by the filling but is otherwise unimpeded.
  • the hollow cylinder has a central passage, it can be pulled over the compressed air line of the ram boring machine; it can also have a concentric pipe section, for example with protruding threads for screwing with two sections of the compressed air line.
  • the hollow cylinder then fills approximately the free annular space between the compressed air line and the wall of the earth channel created by the ram boring machine, so that essentially all of the exhaust air is conditioned.
  • the hollow cylinder can also have a cable connection on at least one end face in order to be able to tension a cable between the rear end of the ram boring machine and the hollow cylinder and / or the hollow cylinder and a pulling tube.
  • the filter can also be arranged directly at the rear end of the ram boring machine or at a distance in a pipe pulled by the machine, since its outside diameter is adapted to the outside diameter of the compressed air device. In any case, it is ensured that practically no exhaust air escapes without having passed the filter.
  • the filter 1 consists of a hollow cylinder 2, the end faces 3, 4 of which each have a central circular opening 5 for a tube piece 6, which is arranged concentrically to the cylinder 2 and has a smaller diameter and a slightly greater length for pulling through a compressed air line 10 and wide re with their centers concentrically arranged to the opening 5 holes 7, 8.
  • filter materials 9, 11 for filtering and soundproofing the exhaust air flow.
  • the filter can also be arranged between two sections of the compressed air line 10, it then migrates with the compressed air line in accordance with the device advance.
  • the filter 1 is arranged in a pneumatically operated ram boring machine 12 in such a way that the compressed air reaches the ram boring machine 12 in the direction of arrow 14, then the exhaust air penetrates through the holes 7 on the end face 3 into the sound-absorbing filling 9 and then into the oil-separating filling 11 and finally emerges from the holes 8 on the end face 5.
  • the filter 1 can be arranged directly at the rear end of the ram boring machine 12 (FIG. 3), at the beginning of the earth channel 13 (FIG. 4) created by the ram boring machine 12 or in a protective tube 15 drawn by the ram boring machine 12 (FIG. 5).
  • the ram boring machine 12 is provided with a control line 16 and a pull rope 17, the hollow cylinder preferably has a corresponding, parallel axis passage, not shown in the drawing.
  • the pull rope can also be attached directly to the hollow cylinder.
  • Its outer diameter corresponds to that of the ram boring machine or that of the protective tube, so that practically no exhaust air can escape unfiltered.
  • the filter according to the invention substantially reduces the sound level of the exhaust air of 100 dBA in ram boring machines and removes oil to a high percentage from the exhaust air. This is of particular importance because ram boring machines of the type in question are mostly used in densely populated and / or busy areas for trenchless laying of supply lines.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (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)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Earth Drilling (AREA)

Abstract

A pneumatic ram boring machine (12) has an air-permeable hollow cylinder (2) with a sound absorbing and/or oil separating packing (9, 11) arranged in the exhaust air stream of the machine.

Description

Die Erfindung betrifft ein pneumatisches Rammbohrgerät, bei dem ein axial hin- und herbewegter, von einer am Gehäuse befestigten Druckluftleitung mit Luft versorgter Kolben seine Schlagenergie an das Gehäuse und/oder dessen Schlagspitze abgibt.The invention relates to a pneumatic ram boring machine in which an axially reciprocated piston supplied with air by a compressed air line attached to the housing delivers its impact energy to the housing and / or its impact tip.

Derartige Rammbohrgeräte (vgl. beispielsweise US-A 4 144 941) auch unter der Bezeichnung Bodenraketen bekannt, dienen in erster Linie dazu, Versorgungsleitungen für Wasser oder Elektrizität sowie Telefonkabel zu verlegen, ohne die Straßendecke oder die Bürgersteige aufreißen zu müssen. Sie besitzen gewöhnlich eine von einem pneumatisch betriebenen Schlagkolben beaufschlagte Schlagspitze. Beim Vortrieb der Schlagspitze wird der Schlagkolben in einem rohrförmigen Gehäuse hin- und herbewegt, indem über eine Druckluftleitung zugeführte Druckluft wechselweise die vordere und die rückwärtige Stirn des Schlagkolbens beaufschlagt. Durchtrittsöffnungen im rückwärtigen Gehäuseende erlauben den Austritt der Abluft in den von dem Rammbohrgerät geschaffenen Erdkanal und von dort ins Freie.Such ram boring machines (see, for example, US-A 4 144 941) also known under the name ground rockets, serve primarily to lay supply lines for water or electricity as well as telephone cables without having to tear open the road surface or the sidewalks. They usually have a percussion tip which is actuated by a pneumatically operated percussion piston. When the percussion tip is propelled, the percussion piston is moved back and forth in a tubular housing in that compressed air supplied through a compressed air line alternately acts on the front and rear foreheads of the percussion piston. Through openings in the rear end of the housing allow the exhaust air to exit into the earth channel created by the ram boring machine and from there to the outside.

Wie bei den meisten Druckluftgeräten werden auch bei Rammbohrgeräten der Druckluft Schmierstoffe wie z.B. Mineralöle oder andere Zusätze beigemischt. Diese Zusatzstoffe gelangen als Nebel zusammen mit der Abluft ins Freie und stellen eine Gefahr für das Bedienungspersonal und die Umwelt dar.As with most compressed air devices, ram boring machines also use lubricants such as e.g. Mineral oils or other additives are added. These additives are released as mist together with the exhaust air and pose a risk to operating personnel and the environment.

Der von den meisten Rammbohrgeräten erzeugte Lärm übersteigt häufig den auf Dauer gesundheitsschädlichen Pegel von 90 dBA. Auch bei einem vorwiegend unter der Erdoberfläche arbeitenden Rammbohrgerät wird dieser Pegel meist überschritten. Insbesondere wenn gleichzeitig mit dem Rammen ein Leitungsrohr eingezogen wird, dringt erheblicher Lärm nach außen, da das Rohr wie ein Schallrohr wirkt.The noise generated by most ram boring machines often exceeds the permanently harmful level of 90 dBA. This level is usually exceeded even with a ram boring machine that mainly works below the surface. In particular, if a pipe is pulled in at the same time as the ramming, considerable noise escapes because the pipe acts like a sound pipe.

Auf einem weiter entfernt liegenden Gebiet der Technik ist es durch die US-A 4 424 883 bekanntgeworden, den Kopf eines pneumatischen Werkzeuges, insbesondere eines Bolzenschießgerätes, mit einem Schalldämpfer-Gehäuse zu versehen. Schließlich ist es aus der CA-A 1 155 400 bekannt, auslaßseitig eines Kühlmittel-Kompressors einen in drei Kammern unterteilten Behälter anzuordnen, wobei in der mittleren Behälterkammer eine filternde und dämpfende Materialschicht eingelagert ist, durch die. das aus dem Kompressor abströmende Kältemittel geleitet wird, um im Kühlmittel enthaltende Ölbestandteile herauszufiltern; gleichzeitig dämpft diese Schicht den vom Kompressor erzeugten Lärm. In beiden Fällen wird jedoch kein axialer Strömungsdurchfluß erreicht, und sowohl die in das auf das Bolzenschießgerät aufgesetzte Schalldämpfer-Gehäuse geleitete Druckluft als auch das in das Filter- und Dämpfungsgehäuse einströmende Kältemittel des Kompressors wird zumindest einmal radial umgelenkt, wobei insbesondere die Druckluft des Bolzenschießgerätes radial nach außen in die Atmosphäre gelangt. Bei beiden Geräten spielt das Problem des axialen Zu- bzw. Abführens sowohl von Druckluft als auch von Abluft beim Einsatz eines Schalldämpfer- und Filtergehäuses keine Rolle.In a more distant field of technology, it has become known from US Pat. No. 4,424,883 to provide the head of a pneumatic tool, in particular a bolt-firing device, with a muffler housing. Finally, it is known from CA-A 1 155 400 to arrange a container divided into three chambers on the outlet side of a coolant compressor, a filtering and damping material layer being embedded in the central container chamber, through which. the refrigerant flowing out of the compressor is conducted to filter out oil components contained in the refrigerant; at the same time, this layer dampens the noise generated by the compressor. In both cases, however, no axial flow flow is achieved, and both the compressed air directed into the muffler housing placed on the bolt-firing device and the refrigerant of the compressor flowing into the filter and damping housing are deflected radially at least once, in particular the compressed air of the bolt-firing unit being radial vented outside into the atmosphere. With both devices, the problem of the axial supply and discharge of both compressed air and exhaust air is irrelevant when using a silencer and filter housing.

Der Erfindung liegt die Aufgabe zugrunde, ein Rammbohrgerät zu schaffen, das einen Teil der den Betrieb solcher Druckluftgeräte begleitenden Beeinträchtigungen der Umwelt vermindert.The invention has for its object to provide a ram boring machine which reduces some of the environmental impairments accompanying the operation of such compressed air devices.

Diese Aufgabe wird bei einem Rammbohrgerät der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß ein im Abluftstrom angeordneter luftdurchlässiger Hohlzylinder einen zylindrischen, von einer schalldämpfenden und/oder einer ölabscheidenden Füllung umhüllten Durchlaß für die Druckluft und in seinen Stirnseiten einander gegenüberliegende, die Abluft koaxial zu dem zentrischen Durchlaß und im Gegenstrom zu der zugeführten Druckluft axial durch die Füllung leitende Abluft-Einlaßlöcher und Abluft-Auslaßlöcher aufweist. Die Luftströme können den Hohlzylinder ohne Umlenkung axial durchströmen, so daß sich ein lediglich durch die Füllung geringfügig gedämpfter, aber ansonsten ungehinderter Luftdurchtritt ergibt.This object is achieved according to the invention in a ram boring machine of the type mentioned at the outset in that an air-permeable hollow cylinder arranged in the exhaust air flow has a cylindrical passage, enveloped by a sound-absorbing and / or an oil-separating filling, for the compressed air and in its end faces opposite one another, the exhaust air coaxial with that centric passage and in countercurrent to the compressed air supplied axially through the filling exhaust air inlet holes and exhaust air outlet holes. The air streams can flow axially through the hollow cylinder without deflection, so that there is an air passage which is only slightly damped by the filling but is otherwise unimpeded.

Wenn der Hohlzylinder einen zentrischen Durchlass aufweist, läßt er sich über die Druckluftleitung des Rammbohrgerätes ziehen; er kann auch ein konzentrisches Rohrstück beispielsweise mit überstehenden Gewinden zum Verschrauben mit zwei Teilstücken der Druckluftleitung aufweisen. Der Hohlzylinder füllt dann in etwa den freien Ringraum zwischen der Druckluftleitung und der Wandung des von dem Rammbohrgerät geschaffenen Erdkanals aus, so daß im wesentlichen die gesamte Abluft konditioniert wird.If the hollow cylinder has a central passage, it can be pulled over the compressed air line of the ram boring machine; it can also have a concentric pipe section, for example with protruding threads for screwing with two sections of the compressed air line. The hollow cylinder then fills approximately the free annular space between the compressed air line and the wall of the earth channel created by the ram boring machine, so that essentially all of the exhaust air is conditioned.

Des weiteren kann der Hohlzylinder auch an mindestens einer Stirnseite einen Seilanschluß besitzen, um zwischen dem rückwärtigen Ende des Rammbohrgeräts und dem Hohlzylinder und/oder dem Hohlzylinder und einem Nachziehrohr ein Seil spannen zu können,Furthermore, the hollow cylinder can also have a cable connection on at least one end face in order to be able to tension a cable between the rear end of the ram boring machine and the hollow cylinder and / or the hollow cylinder and a pulling tube.

Der Filter läßt sich auch direkt am rückwärtigen Ende des Rammbohrgeräts oder aber im Abstand in einem vom Gerät nachgezogenen Leitungsrohr anordnen, da sein Außendurchmesser dem Aussendurchmesser des Druckluftgeräts angepaßt ist. In jedem Fall ist gewährleistet, daß praktisch keine Abluft nach außen dringt, ohne den Filter passiert zu haben.The filter can also be arranged directly at the rear end of the ram boring machine or at a distance in a pipe pulled by the machine, since its outside diameter is adapted to the outside diameter of the compressed air device. In any case, it is ensured that practically no exhaust air escapes without having passed the filter.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels des näheren erläutert, In der Zeichnung zeigen:

  • Fig. 1 einen erfindungsgemäßen Filter im Längsschnitt,
  • Fig. 2 eine Vorderansicht des Filters gemäß Fig.1,
  • Fig. 3 einen mit einem Rammbohrgerät verbundenen Filter gemäß Fig. 1,
  • Fig. 4 einen im Eingang eines Erdkanals angeordneten Filter gemäß Fig. 1 und
  • Fig. 5 einen in einem Nachziehrohr angeordneten Filter gemäß Fig. 1.
The invention is explained below with reference to an exemplary embodiment shown in the drawing, in which:
  • 1 shows a filter according to the invention in longitudinal section,
  • 2 shows a front view of the filter according to FIG. 1,
  • 3 shows a filter connected to a ram boring machine according to FIG. 1,
  • 4 shows a filter arranged in the entrance of an earth channel according to FIGS. 1 and
  • 5 shows a filter according to FIG. 1 arranged in a draw tube.

Der Filter 1 besteht aus einem Hohlzylinder 2, dessen Stirnseiten 3, 4 jeweils eine zentrische kreisförmige Öffnung 5 für ein konzentrisch zum Zylinder 2 angeordnetes Rohrstück 6 kleineren Durchmessers und geringfügig größerer Länge zum Durchziehen einer Druckluftleitung 10 sowie weitere mit ihren Mittelpunkten konzentrisch zur Öffnung 5 angeordneten Löchern 7, 8 aufweisen. In dem Zylinder 2 befinden sich Filtermaterialien 9, 11 zum Filtern und Schalldämmen des Abluftstroms.The filter 1 consists of a hollow cylinder 2, the end faces 3, 4 of which each have a central circular opening 5 for a tube piece 6, which is arranged concentrically to the cylinder 2 and has a smaller diameter and a slightly greater length for pulling through a compressed air line 10 and wide re with their centers concentrically arranged to the opening 5 holes 7, 8. In the cylinder 2 there are filter materials 9, 11 for filtering and soundproofing the exhaust air flow.

Weist das Rohrstück an seinen überstehenden Teilen eine Schlauchkupplung, beispielsweise ein Gewinde, auf, läßt sich der Filter auch zwischen zwei Teilstücken der Druckluftleitung 10 anordnen, er wandert dann mit der Druckluftleitung entsprechend dem Gerätevortrieb.If the pipe section has a hose coupling, for example a thread, on its protruding parts, the filter can also be arranged between two sections of the compressed air line 10, it then migrates with the compressed air line in accordance with the device advance.

Wenn der Filter 1 bei einem pneumatisch betriebenen Rammbohrgerät 12 so angeordnet wird, daß die Druckluft in Richtung des Pfeils 14 zum Rammbohrgerät 12 gelangt, dann dringt die Abluft durch die Löcher 7 der Stirnseite 3 in die schalldämpfende Füllung 9 und anschließend in die ölabscheidende Füllung 11 und tritt schließlich aus den Löchern 8 der Stirnseite 5 aus.If the filter 1 is arranged in a pneumatically operated ram boring machine 12 in such a way that the compressed air reaches the ram boring machine 12 in the direction of arrow 14, then the exhaust air penetrates through the holes 7 on the end face 3 into the sound-absorbing filling 9 and then into the oil-separating filling 11 and finally emerges from the holes 8 on the end face 5.

Die Fig. 3 bis 5 zeigen verschiedene Anordnungsmöglichkeiten für den Filter 1; er läßt sich direkt am rückwärtigen Ende des Rammbohrgerätes 12 (Fig. 3), am Anfang des vom Rammbohrgerät 12 erstellten Erdkanals 13 (Fig. 4) oder in einem vom Rammbohrgerät 12 nachgezogenen Schutzrohr 15 (Fig. 5) anordnen. Ist das Rammbohrgerät 12 mit einer Steuerleitung 16 und einem Nachziehseil 17 versehen, weist der Hohlzylinder vorzugsweise einen entsprechenden, in der Zeichnung nicht dargestellten, achsparallelen Durchlass auf. Das Nachziehseil kann aber auch direkt am Hohlzylinder befestigt sein.3 to 5 show different possible arrangements for the filter 1; it can be arranged directly at the rear end of the ram boring machine 12 (FIG. 3), at the beginning of the earth channel 13 (FIG. 4) created by the ram boring machine 12 or in a protective tube 15 drawn by the ram boring machine 12 (FIG. 5). If the ram boring machine 12 is provided with a control line 16 and a pull rope 17, the hollow cylinder preferably has a corresponding, parallel axis passage, not shown in the drawing. The pull rope can also be attached directly to the hollow cylinder.

Sein Außendurchmesser entspricht dem des Rammbohrgeräts oder dem des Schutzrohrs, so daß praktisch keine Abluft ungefiltert entweichen kann.Its outer diameter corresponds to that of the ram boring machine or that of the protective tube, so that practically no exhaust air can escape unfiltered.

Es hat sich gezeigt, daß der erfindungsgemäße Filter bei Rammbohrgeräten den Schallpegel der Abluft von 100 dBA wesentlich verringert und Öl zu einem hohen Prozentsatz aus der Abluft entfernt. Dies ist von besonderer Bedeutung, weil Rammbohrgeräte der in Rede stehenden Art zumeist in dicht besiedelten und/oder verkehrsreichen Gebieten zum grabenlosen Verlegen von Versorgungsleitungen eingesetzt werden.It has been shown that the filter according to the invention substantially reduces the sound level of the exhaust air of 100 dBA in ram boring machines and removes oil to a high percentage from the exhaust air. This is of particular importance because ram boring machines of the type in question are mostly used in densely populated and / or busy areas for trenchless laying of supply lines.

Claims (6)

1. A pneumatic ram boring machine in which an axially reciprocating piston supplied with air from a compressed air line fixed to the housing imparts its impact energy to the housing and/or the striking tip thereof, characterised in that an air-permeable hollow cylinder (2) arranged in the outgoing air stream has a cylindrical chamber (6) for passage of the compressed air, surrounded by a noise-damping and/or oil-separating packing (9, 11), and has in its ends (3, 4) exhaust inlet holes (7) and exhaust outlet holes (8) arranged opposite one another to conduct the exhaust air axially through the packing (9, 11) coaxially to the central passage and in counter-current to the compressed air supplied.
2. A ram boring machine according to claim 1, characterised in that the hollow cylinder (2) has a concentric pipe section (6).
3. A ram boring machine according to claim 1 or claim 2, characterised in that the hollow cylinder (2) is arranged at the rear end of the machine (12).
4. A ram boring machine according to any one or more of claims 1 to 3, characterised in that at least one of the ends of the hollow cylinder (2) is provided with a cable connection.
5. A ram boring machine according to claim 1 or claim 2, characterised in that the hollow cylinder (2) is arranged in the tunnel (13) made by the machine (12).
6. A ram boring machine according to claim 1 or claim 2, characterised in that the hollow cylinder (2) is arranged in a follower pipe.
EP87112220A 1986-10-10 1987-08-22 Pneumatic boring ram Expired - Lifetime EP0263281B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87112220T ATE57644T1 (en) 1986-10-10 1987-08-22 PNEUMATIC DRILLING RIG.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863634579 DE3634579A1 (en) 1986-10-10 1986-10-10 PNEUMATIC DRILL DRILL
DE3634579 1986-10-10

Publications (2)

Publication Number Publication Date
EP0263281A1 EP0263281A1 (en) 1988-04-13
EP0263281B1 true EP0263281B1 (en) 1990-10-24

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EP87112220A Expired - Lifetime EP0263281B1 (en) 1986-10-10 1987-08-22 Pneumatic boring ram

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Country Link
US (1) US4840234A (en)
EP (1) EP0263281B1 (en)
JP (1) JPS63107686A (en)
AT (1) ATE57644T1 (en)
DE (1) DE3634579A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659111A1 (en) * 1990-03-02 1991-09-06 Desinsectisation Moderne Borer comprising air exhaust (escape, outlet) means
FR2659112A1 (en) * 1990-03-02 1991-09-06 Desinsectisation Moderne Borer for penetrating and moving in a mass of pulverulent material
AU650446B2 (en) * 1990-03-02 1994-06-23 Desinsectisation Moderne Self propelled probe, particularly for penetrating a powdered material
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Also Published As

Publication number Publication date
EP0263281A1 (en) 1988-04-13
JPS63107686A (en) 1988-05-12
DE3634579A1 (en) 1988-04-21
ATE57644T1 (en) 1990-11-15
US4840234A (en) 1989-06-20

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