WO1996003606A1 - Connection coupling for a traction device for laying cables or the like - Google Patents

Connection coupling for a traction device for laying cables or the like Download PDF

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Publication number
WO1996003606A1
WO1996003606A1 PCT/AT1995/000157 AT9500157W WO9603606A1 WO 1996003606 A1 WO1996003606 A1 WO 1996003606A1 AT 9500157 W AT9500157 W AT 9500157W WO 9603606 A1 WO9603606 A1 WO 9603606A1
Authority
WO
WIPO (PCT)
Prior art keywords
coupling
claws
locking
line
locking member
Prior art date
Application number
PCT/AT1995/000157
Other languages
German (de)
French (fr)
Inventor
Johann Pichler
Reinhold Weiss
Original Assignee
Albatros Engineering Gmbh
Flow Tex Horizontalbohrsysteme Gesellschaft Mbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Albatros Engineering Gmbh, Flow Tex Horizontalbohrsysteme Gesellschaft Mbh filed Critical Albatros Engineering Gmbh
Priority to AU29718/95A priority Critical patent/AU2971895A/en
Publication of WO1996003606A1 publication Critical patent/WO1996003606A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
    • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
    • F16L55/1658—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the old pipe being ruptured prior to insertion of a new pipe
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/023—Arrangements for connecting cables or wirelines to downhole devices
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/06—Releasing-joints, e.g. safety joints
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/001—Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
    • F16L55/28—Constructional aspects

Definitions

  • the invention relates to a connection coupling for a traction device for laying in particular pipe or cable lines with a coupling housing which can be attached to the traction device at one end and which on the other hand receives a locking device for coupling a connection part which can be fastened to the line to be laid.
  • pulling devices for pulling in the pipe or cable lines to be laid are often used.
  • the like Used in prepared channels or earth bores, the free end of the line being fitted with a connecting part and being connected via a connecting coupling to the pulling part of a pulling device, for example a cable winch with pulling rope, so that the pulling means of the pulling device which can be pulled in through the channel, the bore or the like, the line to be laid is also drawn in.
  • 3isher are the connecting parts of the lines via towing eyes and. The like.
  • Coupling devices are attached to driving hooks or the like of the traction device, or the full tensile load is transmitted via the connection coupling to the connecting part and thus to the line and there is a risk that the lines will be damaged and often unusable due to load peaks. Only a possible strain-related deformation of the line end serves to indicate such overloads, which is inadequate and, especially in the case of pipelines for gas or water transport, careful leak tests have to be carried out, which are extremely time-consuming and cumbersome and lead to very complex re-laying or refurbishment of the lines if leaks occur.
  • the invention is therefore based on the object of eliminating these deficiencies and of creating a connecting coupling of the type described at the outset which ensures careful laying of lines and reliably prevents damage to the lines to be laid caused by overloading.
  • the locking device has movable claws which can be locked by a locking member in the coupling position and the connecting part forms a coupling head for the positive engagement of the claws
  • the locking member having a preferably hydraulically adjustable signal box as a function of the tensile load that occurs can be withdrawn from the locking position into a release position and the claws to be released can be pressed onto it and the coupling head under tensile load by cooperating wedge surfaces.
  • a connection coupling therefore simultaneously serves as a train limiting device which, when the line is pulled in, only transfers tensile forces to the connection part and thus the line until a certain limit value is reached.
  • the interlocking unlocks the claws by pulling back the locking member and the claws which are now open give in under tensile load or relative movement between the claws and coupling head and uncouple the connecting part. This interrupts the pulling-in process, but at the same time ensures that the line is not exposed to overload and remains undamaged.
  • the resilience to the respective properties of the line and the Adjust the pull-in conditions which guarantees the desired safe pipeline construction. If an overload actually occurs, for example due to the collapse of an earth hole or the like, all that needs to be done is to pull back the line which has already been pulled in and the drawing-in process has to be started again, as a result of which there is no need for subsequent major renovation work.
  • a spring mechanism or the like could be provided as the force-dependent signal box, but it is particularly advantageous if the clutch housing is equipped with a hydraulic signal box, the cylinder of which supports the locking device and the piston of which engages at the end of the hitch, the cylinder space sections separated by the piston are connected to one another by means of a hydraulic line which comprises an adjustable pressure-limiting valve which is effective in the flow direction from the cylinder chamber section subjected to overpressure under tensile load to the vacuum-loaded cylinder chamber section and preferably a bypass line with check valve for the pressure limiting valve.
  • Such a hydraulic interlocking can be subjected to high loads and, despite its robustness, can be adjusted very precisely via the pressure relief valve, and what is more, this interlocking can be optimally integrated into the clutch housing. If the overpressure building up in the one cylinder space section under tensile load exceeds the set limit value in the pressure limiting valve, this valve opens and there is a flow of hydraulic fluid between the two cylinder space sections, which inevitably brings about a piston movement which actuates the locking member leads.
  • the check valve in the bypass line allows the piston to be easily reset, since it is thus possible for the hydraulic medium to flow back via the bypass line without overcoming the pressure limiting valve.
  • the piston rod which is extended towards the claws, itself forms the locking member with its free end, which can be inserted between locking stops of the claws pivotably pivoted about transverse axes to the piston rod, a very simple, space-saving and functionally reliable construction is produced, the between the Locking member engaging locking member prevents the claws from pivoting open and its retraction allows such pivoting.
  • the claws in the attachment area of the coupling head have the coupling head associated drivers for swivel adjustment when pressing the coupling head between the claws, since only the coupling head needs to be inserted between the claws for coupling the connecting part, where it is carried by the drivers Claws pivoted in the coupling sense and leads to an automatic positive locking of the claws on the coupling head.
  • a further advancement of the coupling head then moves the cylinder of the signal box back towards the end of the attachment, so that at the same time the piston, with its free end forming the locking member, penetrates between the locking lugs of the claws and locks the coupling division, which ensures the safe coupling of the guiding line on the connection coupling.
  • connection coupling according to the invention can be used with any traction device which is concerned with limiting the traction force. This use is therefore particularly advantageous for drilling rigs for trenchless pipeline construction.
  • a drilling lance or an expanding head serve as a pulling device, which drilling lances or expanding heads are driven or pulled through the ground with comparatively great force, but the line attached to the drilling lance or the expanding head must not be exposed to excessive tensile stress.
  • the Connection coupling with its traction limitation function is therefore an ideal addition to these tools for trenchless pipeline construction.
  • Fig. 1 shows the working principle of trenchless pipeline construction and Fig. 2 shows a connector according to the invention for such pipeline construction in axial section.
  • an essentially horizontal earth hole 3 is first made using a drilling device 1 with the aid of a drilling lance 2, the drilling lance 2 being from a starting pit 4, according to the soil conditions, more or less deep and in a straight or curved shape to a target pit 5, which drilling lance 2 can be monitored and controlled through an electronic transmitter-receiver device 6 through the soil .
  • the drilling lance 2 is replaced in the target pit 5 by an expansion head 7, which expands the earth hole 3 to the extent required for the line to be drawn in during the return movement and at the same time pulls this line 8 in.
  • there is a connection coupling 9 which at the same time serves as a traction limiting device.
  • connection coupling 9 has a coupling housing 10 which on the one hand forms an attachment end 11 for attachment to the expansion head 7 and on the other hand receives a locking device 12 for coupling a connection part 13 which can be attached to the line 8 to be laid.
  • the locking device 12 comprises around transverse - o
  • Axles 14 pivotable to the direction of pull on the coupling housing 10 claws 15, which in the coupling position engage positively on a coupling head 16 of the connecting part 13 and are lockable in this coupling position via a locking member 17.
  • the locking member 17 is retracted from the locking position shown into a release position by means of a hydraulic interlocking mechanism 18 depending on the tensile load that occurs, so that the released claws 15 then swivel open under tensile load by means of cooperating wedge surfaces 19 on claws 15 and coupling head 16 and the connecting part 13 uncouple.
  • the hydraulic signal box 18 consists of a cylinder 20 formed by the clutch housing 10 and a piston 21 acting on the append end 11, and the cylinder chamber sections 22, 23 separated from each other by the piston 21 are connected to one another via a hydraulic line 24 which has an adjustable pressure relief valve 25 and a bypass line 27 bridging the pressure relief valve 25 and equipped with a check valve 26.
  • the piston 21 of the signal box 18 has a piston rod 28 which is extended towards the claws 15 and whose free end itself forms the locking member 17.
  • This locking member 17 is inserted in the locking position between locking stops 29 of the claws 15, which prevents them from pivoting.
  • the claws form drivers 30, on which the penetrating coupling head 16 engages and, when pushed forward, causes the claws 15 to pivot in the coupling direction.
  • the connection coupling 9 the end of the hitch 11 hangs on the expansion head 7 and the line 8 is coupled via the connection part 13, the coupling head 16 being held positively by the claws 15, which claws 15 are locked via the locking member 17.
  • the tensile load occurring by pulling the line 8 into the earth bore 3 is therefore transmitted from the appended end 11 to the piston 21 of the signal box 18 and from here via the cylinder space section 22 and the cylinder 20 or the clutch housing 10 to the claws 15 that pass this tensile load on the coupling head 16 and the connecting part 13.
  • the hydraulic pressure in the cylinder chamber section 22 closes the check valve 26 of the bypass line 27 and is present at the pressure limiting valve 25, via which the transmission of the tensile load can now be controlled. If the hydraulic pressure exceeds the limit value set in the pressure-limiting valve, the valve opens and the hydraulic fluid flows from the cylinder chamber section 22 through the hydraulic line 24 into the cylinder chamber section 23 with simultaneous piston movement.
  • the uncoupled line 8 is pulled back into the target pit and the pulling-in process must be repeated.
  • connection part 13 To couple the connection part 13 to the connection coupling 9, only the connection part 13 with its coupling head 16 needs in the pulling direction between the when the locking device is withdrawn. member 17 open claws 15 to be pressed in, whereby the end face of the coupling head 16 engages the drivers 30 of the claws 15 and swivels the claws in the closing direction. A further advance of the connecting part 13 leads to a relative movement of the coupling housing 10 and the end 11 of the attachment or the piston 21, as a result of which the piston 21 is displaced again in the direction of the cylinder space section 23 and the locking member 17 penetrates between the locking projections 29 of the claws 15 , with which the connecting part 13 is coupled.
  • This displacement movement of the piston 21 also brings about a backflow of the hydraulic medium through the hydraulic line 24 and the bypass line 27, which is open in this direction by the check valve 26, into the cylinder chamber section 22, thereby resulting in the starting situation for the connecting coupling 9 is enough.
  • An automatic coupling of the connection head 13 therefore also activates the pressure-limiting device by means of the signal box 18, wherein an adjustment of the pressure-limiting valve 25 allows the tensile load limit value to be adapted to the various conditions and conditions.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

The invention concerns a connection coupling (9) for a traction device for laying pipelines or cables in particular. The connection coupling (9) comprises a coupling housing (10) which at one end can be suspended on the traction device and which, at the other end, accommodates a locking arrangement (12) for coupling a connection part (13). In order to restrict in a functionally reliable manner the tensile load which can be transferred, the locking arrangement (12) comprises movable claws (15) which can be locked in the coupling position by a locking member (17), and the connection part (13) forms a coupling head (16) for the interlocking attachment of the claws (15). The locking member (17) can be retracted from the locking position into a release position by a hydraulic adjusting unit (18) in dependence on the incident tensile load, and the claws (15) to be released can be urged open under tensile load by co-operating wedge surfaces (19).

Description

Anschlußkupplung für eine Zugvorrichtung zum Verlegen von Leitungen od.dgl. Connection coupling for a pulling device for laying lines or the like.
Die Erfindung bezieht sich auf eine Anschlußkupplung für eine Zugvorrichtung zum Verlegen insbesondere von Rohr- oder Kabel¬ leitungen mit einem einerends an der Zugvorrichtung anhängba¬ ren Kupplungsgehäuse, das andernends eine Verriegelungsein¬ richtung zum Ankuppeln eines an der zu verlegenden Leitung befestigbaren Anschlußteiles aufnimmt.The invention relates to a connection coupling for a traction device for laying in particular pipe or cable lines with a coupling housing which can be attached to the traction device at one end and which on the other hand receives a locking device for coupling a connection part which can be fastened to the line to be laid.
Beim Leitungsbau werden häufig Zugvorrichtungen zum Einziehen der zu verlegenden Rohr- oder Kabelleitungen u. dgl. in vor¬ bereitete Kanäle oder Erdbohrungen eingesetzt, wobei das freie Ende der Leitung mit einem Anschlußteil bestückt und über eine Anschlußkupplung an den Zugteil einer Zugvorrichtung, bei¬ spielsweise eine Seilwinde mit Zugseil, angeschlossen wird, so daß über das Zugmittel der Zugvorrichtung, das durch den Kanal, die Bohrung od. dgl. einholbar ist, auch die zu verle¬ gende Leitung eingezogen wird. 3isher sind dabei die Anschlu߬ teile der Leitungen über Zugösen u. dgl. Kupplungseinrichtun¬ gen an Mitnahmehaken od. dgl. der Zugvorrichtung angehängt, odurcn die volle Zugbelastung über die Anscnlußkupplung auf den Anschlußteil und damit auf die Leitung übertragen wird und die Gefahr besteht, daß durch Belastungsspitzen die Lei¬ tungen beschädigt und vielfach unbrauchbar werden. Zur Anzeige solcher Uberbelastungen dient lediglich eine eventuell bela¬ stungsbedingte Verformung des Leitungsendes, was unzulänglich ist, und es müssen vor allem bei Rohrleitungen ür den Gas¬ oder Wassertransport sorgfältige Dichtheitsprüfungen durch¬ geführt werden, die äußerst zeitraubend und umständlich sind und bei Auftreten von Leckstellen zu sehr aufwendigen Neuver¬ legungen bzw. Sanierungsarbeiten der Leitungen führen.In line construction, pulling devices for pulling in the pipe or cable lines to be laid are often used. The like. Used in prepared channels or earth bores, the free end of the line being fitted with a connecting part and being connected via a connecting coupling to the pulling part of a pulling device, for example a cable winch with pulling rope, so that the pulling means of the pulling device which can be pulled in through the channel, the bore or the like, the line to be laid is also drawn in. 3isher are the connecting parts of the lines via towing eyes and. The like. Coupling devices are attached to driving hooks or the like of the traction device, or the full tensile load is transmitted via the connection coupling to the connecting part and thus to the line and there is a risk that the lines will be damaged and often unusable due to load peaks. Only a possible strain-related deformation of the line end serves to indicate such overloads, which is inadequate and, especially in the case of pipelines for gas or water transport, careful leak tests have to be carried out, which are extremely time-consuming and cumbersome and lead to very complex re-laying or refurbishment of the lines if leaks occur.
Der Erfindung liegt daher die Aufgabe zugrunde, diese Mängel zu beseitigen und eine Anschlußkupplung der eingangs geschil¬ derten Art zu schaffen, die ein schonendes Leitungsverlegen gewährleistet und überlastungsbedingte Beschädigungen der zu verlegenden Leitungen sicher vermeidet.The invention is therefore based on the object of eliminating these deficiencies and of creating a connecting coupling of the type described at the outset which ensures careful laying of lines and reliably prevents damage to the lines to be laid caused by overloading.
Die Erfindung löst diese Aufgabe dadurch, daß die Verriege¬ lungseinrichtung bewegliche, über ein Sperrglied in Kupplungs¬ stellung verriegelbare Klauen aufweist und der Anschlußteil einen Kupplungskopf zum formschlüssigen Ansatz der Klauen bildet, wobei das Sperrglied mit einem vorzugsweise hydrau¬ lisch einstellbaren Stellwerk in Abhängigkeit von der auf¬ tretenden Zugbelastung aus der VerriegelungsStellung in eine Freigabestellung zurückziehbar ist und die freizugebenden Klauen durch zusammenwirkende Keilflächen an ihren und dem Kupplungskopf unter Zugbelastung aufdrückbar sind. Eine sol¬ che Anschlußkupplung dient daher gleichzeitig als Zugbegren¬ zungseinrichtung, die beim Einziehen der Leitung Zugkräfte nur bis zum Erreichen eines bestimmten Grenzwertes auf den Anschlußteil und damit die Leitung überträgt. Wird dieser Grenzwert überschritten, entriegelt das Stellwerk durch Zu¬ rückziehen des Sperrgliedes die Klauen und die nun offenba¬ ren Klauen geben bei Zugbelastung bzw. Relativbewegung zwi¬ schen Klauen und Kupplungskopf nach und entkuppeln den An¬ schlußteil. Damit wird zwar der Einziehvorgang unterbrochen, aber gleichzeitig sichergestellt, daß die Leitung keiner Uber- belastung ausgesetzt wird und unbeschädigt bleibt. Durch das Einstellen des auslösenden Grenzwertes läßt sich die Belast¬ barkeit auf die jeweiligen Eigenschaften der Leitung und die Einziehverhältnisse anpassen, was den gewünschten sicheren Leitungsbau garantiert. Tritt tatsächlich eine Überbelastung auf, beispielsweise durch ein Zusammenbrechen einer Erdboh¬ rung od. dgl., braucht lediglich die bereits eingezogene Lei¬ tung wieder zurückgezogen und der Einziehvorgang nochmals be¬ gonnen zu werden, wodurch sich ein nachträglicher größerer Sanierungsaufwand erübrigt.The invention solves this problem in that the locking device has movable claws which can be locked by a locking member in the coupling position and the connecting part forms a coupling head for the positive engagement of the claws, the locking member having a preferably hydraulically adjustable signal box as a function of the tensile load that occurs can be withdrawn from the locking position into a release position and the claws to be released can be pressed onto it and the coupling head under tensile load by cooperating wedge surfaces. Such a connection coupling therefore simultaneously serves as a train limiting device which, when the line is pulled in, only transfers tensile forces to the connection part and thus the line until a certain limit value is reached. If this limit value is exceeded, the interlocking unlocks the claws by pulling back the locking member and the claws which are now open give in under tensile load or relative movement between the claws and coupling head and uncouple the connecting part. This interrupts the pulling-in process, but at the same time ensures that the line is not exposed to overload and remains undamaged. By setting the triggering limit value, the resilience to the respective properties of the line and the Adjust the pull-in conditions, which guarantees the desired safe pipeline construction. If an overload actually occurs, for example due to the collapse of an earth hole or the like, all that needs to be done is to pull back the line which has already been pulled in and the drawing-in process has to be started again, as a result of which there is no need for subsequent major renovation work.
Als kraftabhängig arbeitendes Stellwerk könnte ein Federwerk od. dgl. vorgesehen sein, doch besonders vorteilhaft ist es, wenn das Kupplungsgehäuse mit einem hydraulischen Stellwerk ausgerüstet ist, dessen Zylinder die Verriegelungseinrichtung abstützt und dessen Kolben am Anhängeende angreift, wobei die durch den Kolben voneinander getrennten Zylinderraumabschnitte über eine Hydraulikleitung miteinander verbunden sind, die ein einstellbares, in S römungsrichtung vom unter Zugbelastung überdruckbeaufschlagten Zylinderraumabschnitt zum unterdruck- beaufschlagten Zylinderraumabschnitt wirksames Druckbegren¬ zungsventil und vorzugsweise eine Umgehungsleitung mit Rück¬ schlagventil für das Druckbegrenzungsventil umfaßt. Ein sol¬ ches hydraulisches Stellwerk ist hochbelastbar und trotz sei¬ ner Robustheit über das Druckbegrenzungsventil sehr genau ein¬ stellbar, wozu noch kommt, daß sich dieses Stellwerk bestens in das Kupplungsgehäuse integrieren läßt. Überschreitet der sich in dem einen Zylinderraumabschnitt bei Zugbelastung auf¬ bauende Überdruck den eingestellten Grenzwert im Druckbegren¬ zungsventil, öffnet dieses Ventil und es kommt zu einem Hy¬ draulikmittelfluß zwischen den beiden Zylinderraumabschnitten, was zwangsweise eine Kolbenbewegung mit sich bringt, die zur Betätigung des Sperrgliedes führt. Das Rückschlagventil in der Umgehungsleitung erlaubt eine einfache Rückstellung des Kolbens, da so eine Rückströmung des Hydraulikmittels über die Umgehungsleitung ohne Überwindung des Druckbegrenzungs¬ ventils möglich ist. Bildet die zu den Klauen hin verlängerte Kolbenstange mit ih¬ rem freien Ende selbst das Sperrglied, das zwischen Sperran¬ schläge der um Querachsen zur Kolbenstange schwenkbar gela¬ gerten Klauen einschiebbar ist, entsteht eine sehr einfache, platzsparende und funktionssichere Konstruktion, wobei das zwischen die Sperranschläge eingreifende Sperrglied ein Auf¬ schwenken der Klauen verhindert und sein Zurückziehen ein solches Au schwenken erlaubt.A spring mechanism or the like could be provided as the force-dependent signal box, but it is particularly advantageous if the clutch housing is equipped with a hydraulic signal box, the cylinder of which supports the locking device and the piston of which engages at the end of the hitch, the cylinder space sections separated by the piston are connected to one another by means of a hydraulic line which comprises an adjustable pressure-limiting valve which is effective in the flow direction from the cylinder chamber section subjected to overpressure under tensile load to the vacuum-loaded cylinder chamber section and preferably a bypass line with check valve for the pressure limiting valve. Such a hydraulic interlocking can be subjected to high loads and, despite its robustness, can be adjusted very precisely via the pressure relief valve, and what is more, this interlocking can be optimally integrated into the clutch housing. If the overpressure building up in the one cylinder space section under tensile load exceeds the set limit value in the pressure limiting valve, this valve opens and there is a flow of hydraulic fluid between the two cylinder space sections, which inevitably brings about a piston movement which actuates the locking member leads. The check valve in the bypass line allows the piston to be easily reset, since it is thus possible for the hydraulic medium to flow back via the bypass line without overcoming the pressure limiting valve. If the piston rod, which is extended towards the claws, itself forms the locking member with its free end, which can be inserted between locking stops of the claws pivotably pivoted about transverse axes to the piston rod, a very simple, space-saving and functionally reliable construction is produced, the between the Locking member engaging locking member prevents the claws from pivoting open and its retraction allows such pivoting.
Günstig ist es weiters, wenn die Klauen im Ansatzbereich des Kupplungskopfes dem Kupplungskopf zugeordnete Mitnehmer zum Schwenkverstellen beim Eindrücken des Kupplungskopfes zwischen die Klauen aufweisen, da so zum Ankuppeln des Anschlußteiles lediglich der Kupplungskopf zwischen die Klauen eingeführt zu werden braucht, wo er durch die Mitnehmer die Klauen im Kupp¬ lungssinne verschwenkt und zu einem selbsttätigen formschlüs¬ sigen Verrasten der Klauen am Kupplungskopf führt. Ein weite¬ res Vorschieben des Kupplungskopfes bewegt dann den Zylinder des Stellwerkes in Richtung zum Anhängeende zurück, so daß gleichzeitig der Kolben mit seinem das Sperrglied bildenden freien Ende zwischen die Sperransätze der Klauen eindringt und die Kupplungssteilung verriegelt, was das sichere Ankup¬ peln der zu verlegenden Leitung an der Anschlußkupplung ge¬ währleistet.It is also expedient if the claws in the attachment area of the coupling head have the coupling head associated drivers for swivel adjustment when pressing the coupling head between the claws, since only the coupling head needs to be inserted between the claws for coupling the connecting part, where it is carried by the drivers Claws pivoted in the coupling sense and leads to an automatic positive locking of the claws on the coupling head. A further advancement of the coupling head then moves the cylinder of the signal box back towards the end of the attachment, so that at the same time the piston, with its free end forming the locking member, penetrates between the locking lugs of the claws and locks the coupling division, which ensures the safe coupling of the guiding line on the connection coupling.
Die erfindungsgemäße Anschlußkupplung läßt sich bei jeder Zug¬ vorrichtung einsetzen, bei der es um die Begrenzung der Zug¬ kraft geht. Besonders vorteilhaft ist dieser Einsatz daher bei Bohrgeräten für den grabenlosen Leitungsbau. Hier dienen dann eine Bohrlanze oder ein Aufweitkopf als Zugvorrichtung, welche Bohrlanzen bzw. Aufweitköpfe mit vergleichsweise großer Kraft durch den Boden vorgetrieben oder durchgezogen werden, die an der Bohrlanze oder dem Aufweitkopf angehängte Leitung aber keiner übermäßigen Zugbelastung ausgesetzt werden darf. Die Anschlußkupplung mit ihrer Zugkraftbegrenzungsfunktion stellt demnach eine optimale Ergänzung dieser Werkzeuge beim graben¬ losen Leitungsbau dar.The connection coupling according to the invention can be used with any traction device which is concerned with limiting the traction force. This use is therefore particularly advantageous for drilling rigs for trenchless pipeline construction. Here then a drilling lance or an expanding head serve as a pulling device, which drilling lances or expanding heads are driven or pulled through the ground with comparatively great force, but the line attached to the drilling lance or the expanding head must not be exposed to excessive tensile stress. The Connection coupling with its traction limitation function is therefore an ideal addition to these tools for trenchless pipeline construction.
In der Zeicnnung ist der Erfindungsgegenstand an Hand eines Ausführungsbeispieles rein schematisch veranschaulicht, und zwar zeigenIn the drawing, the subject matter of the invention is illustrated purely schematically on the basis of an exemplary embodiment, specifically showing
Fig. 1 das Arbeitsprinzip des grabenlosen Leitungsbaues und Fig. 2 eine erfindungsgemäße Anschlußkupplung für einen solchen Leitungsbau im Axialschnitt.Fig. 1 shows the working principle of trenchless pipeline construction and Fig. 2 shows a connector according to the invention for such pipeline construction in axial section.
Um Leitungen, ohne den Boden aufgraben zu müssen, im Erdreich verlegen zu können, wird, wie in Fig. 1 veranschaulicht, zu¬ erst über ein Bohrgerät 1 mit Hilfe einer Bohrlanze 2 eine im wesentlichen horizontale Erdbohrung 3 hergestellt, wobei die Bohrlanze 2 von einer Startgrube 4 aus, den Bodenverhältnis¬ sen entsprechend, mehr oder weniger tief und in geradem oder bogenförmigem Verlauf bis zu einer Zielgrube 5 vorwärtsgetrie¬ ben wird, welche Bohrlanze 2 über eine elektronische Sender- Empfängereinrichtung 6 durch das Erdreich hindurch überwacht und gesteuert werden kann. Ist die Erdbohrung 3 vorbereitet, wird in der Zielgrube 5 die Bohrlanze 2 durch einen Aufweit¬ kopf 7 ersetzt, der bei der Rückbewegung die Erdbohrung 3 auf das für die einzuziehende Leitung erforderliche Maß aufweitet und gleichzeitig diese Leitung 8 einzieht. Um bei diesem Ein¬ ziehen eine Überbelastung der Leitung 8 zu verhindern, gibt es eine Anschlußkupplung 9, die gleichzeitig als Zugkraftbegren¬ zungseinrichtung dient.In order to be able to lay lines in the ground without having to dig up the ground, as shown in FIG. 1, an essentially horizontal earth hole 3 is first made using a drilling device 1 with the aid of a drilling lance 2, the drilling lance 2 being from a starting pit 4, according to the soil conditions, more or less deep and in a straight or curved shape to a target pit 5, which drilling lance 2 can be monitored and controlled through an electronic transmitter-receiver device 6 through the soil . If the earth hole 3 is prepared, the drilling lance 2 is replaced in the target pit 5 by an expansion head 7, which expands the earth hole 3 to the extent required for the line to be drawn in during the return movement and at the same time pulls this line 8 in. In order to prevent overloading of the line 8 during this pulling-in, there is a connection coupling 9 which at the same time serves as a traction limiting device.
Gemäß dem Ausführungsbeispiel nach Fig. 2 weist die Anschlu߬ kupplung 9 ein Kupplungsgehäuse 10 auf, das einerseits ein Anhängeende 11 zum Anhängen am Aufweitkopf 7 bildet und an¬ derseits eine Verriegelungseinrichtung 12 zum Ankuppeln eines an der zu verlegenden Leitung 8 befestigbaren Anschlußteiles 13 aufnimmt. Die Verriegelungseinrichtung 12 umfaßt um Quer- - oAccording to the exemplary embodiment according to FIG. 2, the connection coupling 9 has a coupling housing 10 which on the one hand forms an attachment end 11 for attachment to the expansion head 7 and on the other hand receives a locking device 12 for coupling a connection part 13 which can be attached to the line 8 to be laid. The locking device 12 comprises around transverse - o
achsen 14 zur Zugrichtung schwenkbar am Kupplungsgehäuse 10 angelenkte Klauen 15, die in Kupplungsstellung formschlüssig an einem Kupplungskopf 16 des Anschlußteiles 13 ansetzen und in dieser Kupplungsstellung über ein Sperrglied 17 verriegel¬ bar sind.Axles 14 pivotable to the direction of pull on the coupling housing 10 claws 15, which in the coupling position engage positively on a coupling head 16 of the connecting part 13 and are lockable in this coupling position via a locking member 17.
Das Sperrglied 17 wird mittels eines hydraulischen Stellwerkes 18 in Abhängigkeit von der auftretenden Zugbelastung aus der dargestellten VerriegelungsStellung in eine Freigabestellung zurückgezogen, so daß dann die freigegebenen Klauen 15 durch zusammenwirkende Keilflächen 19 an Klauen 15 und Kupplungs¬ kopf 16 unter Zugbelastung aufschwenken und den Anschlußteil 13 entkuppeln.The locking member 17 is retracted from the locking position shown into a release position by means of a hydraulic interlocking mechanism 18 depending on the tensile load that occurs, so that the released claws 15 then swivel open under tensile load by means of cooperating wedge surfaces 19 on claws 15 and coupling head 16 and the connecting part 13 uncouple.
Das hydraulische Stellwerk 18 besteht aus einem vom Kupplungs¬ gehäuse 10 gebildeten Zylinder 20 und einem am Anhängeende 11 angreifenden Kolben 21 und die durch den Kolben 21 voneinander getrennten Zylinderraumabschnitte 22, 23 stehen miteinander über eine Hydraulikleitung 24 in Verbindung, die ein einstell¬ bares Druckbegrenzungsventil 25 und eine das Druckbegrenzungs- ventil 25 überbrückende, mit einem Rückschlagventil 26 ausge¬ stattete Umgehungsleitung 27 umfaßt.The hydraulic signal box 18 consists of a cylinder 20 formed by the clutch housing 10 and a piston 21 acting on the append end 11, and the cylinder chamber sections 22, 23 separated from each other by the piston 21 are connected to one another via a hydraulic line 24 which has an adjustable pressure relief valve 25 and a bypass line 27 bridging the pressure relief valve 25 and equipped with a check valve 26.
Der Kolben 21 des Stellwerks 18 weist eine zu den Klauen 15 hin verlängerte Kolbenstange 28 auf, deren freies Ende selbst das Sperrglied 17 bildet. Dieses Sperrglied 17 ist in Ver¬ riegelungsstellung zwischen Sperranschlägen 29 der Klauen 15 eingeführt, was deren Au schwenken verhindert. Zum Schwenkver¬ stellen der reigegebenen und geöffneten Klauen 15 beim Ein¬ führen des Kupplungskopfes 16 bilden die Klauen Mitnehmer 30, an denen der eindringende Kupplungskopf 16 angreift und beim Vordrücken für ein Verschwenken der Klauen 15 im Kuppelsinn sorgt. Beim Einsatz der Anschlußkupplung 9 hängt das Anhängeende 11 am Aufweitkopf 7 und die Leitung 8 ist über den Anschlußteil 13 angekuppelt, wobei der Kupplungskopf 16 formschlüssig von den Klauen 15 festgehalten wird, welche Klauen 15 über das Sperrglied 17 verriegelt sind. Die durch das Einziehen der Leitung 8 in die Erdbohrung 3 auftretende Zugbelastung wird daher vom Anhängeende 11 auf den Kolben 21 des Stellwerks 18 und von hier über den Zylinderraumabschnitt 22 und den Zylin¬ der 20 bzw. das Kupplungsgehäuse 10 auf die Klauen 15 übertra¬ gen, die diese Zugbelastung auf den Kupplungskopf 16 und den Anschlußteil 13 weitergeben. Der Hydraulikdruck im Zylinder¬ raumabschnitt 22 verschließt das Rückschlagventil 26 der Um¬ gehungsleitung 27 und liegt am Druckbegrenzungsventil 25 an, über das nun die Übertragung der Zugbelastung kontrolliert werden kann. Überschreitet der Hydrauli druck den im Druck¬ begrenzungsventil eingestellten Grenzwert, öffnet das Ventil und Hydraulikmittel strömt unter gleichzeitiger Kolbenbewegung aus dem Zylinderraumabschnitt 22 durch die Hydraulikleitung 24 in den Zylinderraumabschnitt 23. Mit der Kolbenbewegung wird das Sperrglied 17 aus dem Bereich der Sperranschläge 29 der Klauen 15 zurückgezogen, wodurch die Keilwirkung der Keilflä¬ chen 19 nun die freigegebenen Klauen 15 au schwenken kann und der Anschlußteil 13 freikommt. Eine über die am Druckbegren¬ zungsventil 25 eingestellte Druckbelastung hinausgehende Zug¬ belastung führt daher zwangsweise zu einem Entkuppeln der Lei¬ tung 8, so daß eine belastungsbedingte Beschädigung dieser Leitung verhindert wird.The piston 21 of the signal box 18 has a piston rod 28 which is extended towards the claws 15 and whose free end itself forms the locking member 17. This locking member 17 is inserted in the locking position between locking stops 29 of the claws 15, which prevents them from pivoting. For pivoting the released and opened claws 15 when inserting the coupling head 16, the claws form drivers 30, on which the penetrating coupling head 16 engages and, when pushed forward, causes the claws 15 to pivot in the coupling direction. When using the connection coupling 9, the end of the hitch 11 hangs on the expansion head 7 and the line 8 is coupled via the connection part 13, the coupling head 16 being held positively by the claws 15, which claws 15 are locked via the locking member 17. The tensile load occurring by pulling the line 8 into the earth bore 3 is therefore transmitted from the appended end 11 to the piston 21 of the signal box 18 and from here via the cylinder space section 22 and the cylinder 20 or the clutch housing 10 to the claws 15 that pass this tensile load on the coupling head 16 and the connecting part 13. The hydraulic pressure in the cylinder chamber section 22 closes the check valve 26 of the bypass line 27 and is present at the pressure limiting valve 25, via which the transmission of the tensile load can now be controlled. If the hydraulic pressure exceeds the limit value set in the pressure-limiting valve, the valve opens and the hydraulic fluid flows from the cylinder chamber section 22 through the hydraulic line 24 into the cylinder chamber section 23 with simultaneous piston movement. With the piston movement, the locking member 17 is removed from the area of the locking stops 29 of the claws 15 withdrawn, as a result of which the wedge effect of the wedge surfaces 19 can now pivot the released claws 15 and the connecting part 13 is released. A tensile load exceeding the pressure load set on the pressure limiting valve 25 therefore inevitably leads to a decoupling of the line 8, so that load-related damage to this line is prevented.
Die entkuppelte Leitung 8 wird in die Zielgrube zurückgezogen und der Einziehvorgang muß wiederholt werden.The uncoupled line 8 is pulled back into the target pit and the pulling-in process must be repeated.
Zum Ankuppeln des Anschlußteils 13 an die Anschlußkupplung 9 braucht lediglich der Anschlußteil 13 mit seinem Kupplungs¬ kopf 16 in Zugrichtung zwischen die bei zurückgezogenem Sperr- glied 17 geöffneten Klauen 15 eingedrückt zu werden, wodurch die Stirnfläche des Kupplungskopfes 16 an den Mitnehmern 30 der Klauen 15 angreift und die Klauen im Schließsinne zu¬ schwenkt. Ein weiteres Vordrücken des Anschlußteiles 13 führt zu einer Relativbewegung von Kupplungsgehäuse 10 und Anhänge¬ ende 11 bzw. Kolben 21, wodurch der Kolben 21 wieder in Rich¬ tung Zylinderraumabschnitt 23 verschoben wird und das Sperr¬ glied 17 zwischen die Sperransätze 29 der Klauen 15 eindringt, womit der Anschlußteil 13 angekuppelt ist. Diese Verschiebebe¬ wegung des Kolbens 21 bringt gleichzeitig auch ein Rückströmen des Hydraulikmittels durch die Hydraulikleitung 24 und die durch das Rückschlagventil 26 in dieser Richtung offene Umge¬ hungsleitung 27 in den Zylinderraumabschnitt 22 mit sich, wo¬ durch die Ausgangssituation für die Anschlußkupplung 9 er¬ reicht ist. Ein selbsttätiges Ankuppeln des Anschlußkopfes 13 aktiviert daher auch die Druckbegrenzungseinrichtung durch das Stellwerk 18, wobei ein Einstellen des Druckbegrenzungsventils 25 die Anpassung des Zugbelastungs-Grenzwertes an die ver¬ schiedenen Gegebenheiten und Verhältnisse erlaubt. To couple the connection part 13 to the connection coupling 9, only the connection part 13 with its coupling head 16 needs in the pulling direction between the when the locking device is withdrawn. member 17 open claws 15 to be pressed in, whereby the end face of the coupling head 16 engages the drivers 30 of the claws 15 and swivels the claws in the closing direction. A further advance of the connecting part 13 leads to a relative movement of the coupling housing 10 and the end 11 of the attachment or the piston 21, as a result of which the piston 21 is displaced again in the direction of the cylinder space section 23 and the locking member 17 penetrates between the locking projections 29 of the claws 15 , with which the connecting part 13 is coupled. This displacement movement of the piston 21 also brings about a backflow of the hydraulic medium through the hydraulic line 24 and the bypass line 27, which is open in this direction by the check valve 26, into the cylinder chamber section 22, thereby resulting in the starting situation for the connecting coupling 9 is enough. An automatic coupling of the connection head 13 therefore also activates the pressure-limiting device by means of the signal box 18, wherein an adjustment of the pressure-limiting valve 25 allows the tensile load limit value to be adapted to the various conditions and conditions.

Claims

P a t e t a n p r ü c h e : Patent claims:
1. Anschlußkupplung für eine Zugvorrichtung zum Verlegen ins¬ besondere von Rohr- oder Kabelleitungen mit einem einerends an der Zugvorrichtung anhängbaren Kupplungsgehäuse, das andern- ends eine Verriegelungseinrichtung zum Ankuppeln eines an der zu verlegenden Leitung befestigbaren Anschlußteiles aufnimmt, dadurch gekennzeichnet, daß die Verriegelungseinrichtung (12) bewegliche, über ein Sperrglied (17) in KupplungsStellung ver¬ riegelbare Klauen (15) aufweist und der Anschlußteil (13) ei¬ nen Kupplungskopf (16) zum formschlüssigen Ansatz der Klauen (15) bildet, wobei das Sperrglied (17) mit einem vorzugsweise hydraulisch einstellbaren Stellwerk (18) in Abhängigkeit von der auftretenden Zugbelastung aus der Verriegelungsstellung in eine Freigabestellung zurückziehbar ist und die freizuge¬ benden Klauen (15) durch zusammenwirkende Keilflächen (19) an ihnen und dem Kupplungskopf (16) unter Zugbelastung auf¬ drückbar sind.1. Connection coupling for a traction device for laying in particular pipe or cable lines with a coupling housing which can be attached to the traction device at one end and which at the other end houses a locking device for coupling a connecting part which can be fastened to the line to be laid, characterized in that the locking device ( 12) has movable claws (15) which can be locked in the coupling position via a locking member (17) and the connecting part (13) forms a coupling head (16) for the positive engagement of the claws (15), the locking member (17) also a preferably hydraulically adjustable signal box (18) can be withdrawn from the locking position into a release position depending on the tensile load that occurs, and the claws (15) to be released can be pressed under tensile load by cooperating wedge surfaces (19) on them and the coupling head (16) are.
2. Anschlußkupplung nach Anspruch 1, dadurch gekennzeichnet, daß das Kupplungsgehäuse (10) mit einem hydraulischen Stell¬ werk (18) ausgerüstet ist, dessen Zylinder (20) die Verriege- lunseinrichtung (12) abstützt und dessen Kolben (21) am An¬ hängeende fll) angreift, wobei die durch den Kolben (21) von¬ einander getrennten Zylinderraumabschnitte (22, 23) über eine Hydraulikleitung (24) miteinander verbunden sind, die ein ein¬ stellbares, in Strömungsrichtung vom unter Zugbelastung über¬ druckbeaufschlagten Zylinderraumabschnitt (22) zum unterdruck- beaufschlagten Zylinderraumabschnitt (23) wirksames Druckbe¬ grenzungsventil (25) und vorzugsweise eine Umgehungsleitung (27) mit Rückschlagventil (26) für das Druckbegrenzungsventil (25) umfaßt. 2. Connection coupling according to claim 1, characterized in that the coupling housing (10) is equipped with a hydraulic Stell¬ mechanism (18), the cylinder (20) supports the locking device (12) and the piston (21) on the An¬ hanging end fll), whereby the cylinder chamber sections (22, 23) separated from each other by the piston (21) are connected to one another via a hydraulic line (24), which has an adjustable cylinder chamber section (22 ) to the vacuum-loaded cylinder chamber section (23) effective pressure relief valve (25) and preferably a bypass line (27) with check valve (26) for the pressure relief valve (25).
3. Anschlußkupplung nach .Anspruch 2, dadurch gekennzeichnet, daß die zu den Klauen (15) hin verlängerte Kolbenstange (28) mit ihrem freien Ende selbst das Sperrglied (17) bildet, das zwischen Sperranschläge (29) der um Querachsen (14) zur Kol¬ benstange (28) schwenkbar gelagerten Klauen (15) einschiebbar ist.3. Coupling according to .Anspruch 2, characterized in that the extended to the claws (15) piston rod (28) with its free end itself the locking member (17), the between locking stops (29) to the transverse axes (14) Piston rod (28) pivotally mounted claws (15) can be inserted.
4. Anschlußkupplung nach Anspruch 2 oder 3, dadurch gekenn¬ zeichnet, daß die Klauen (15) im Ansatzbereich des Kupplungs¬ kopfes (16) dem Kupplungskopf (16) zugeordnete Mitnehmer (30) zum Schwenkverstellen beim Eindrücken des Kupplungskopfes (16) zwischen die Klauen (15) aufweisen. 4. Connection coupling according to claim 2 or 3, characterized gekenn¬ characterized in that the claws (15) in the attachment area of the coupling head (16) associated with the coupling head (16) driver (30) for pivoting when pressing the coupling head (16) between the Have claws (15).
PCT/AT1995/000157 1994-07-28 1995-07-28 Connection coupling for a traction device for laying cables or the like WO1996003606A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29718/95A AU2971895A (en) 1994-07-28 1995-07-28 Connection coupling for a traction device for laying cables or the like

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0149294A AT400882B (en) 1994-07-28 1994-07-28 CONNECTING COUPLING FOR A TOWING DEVICE FOR LAYING LINES OD. DGL.
ATA1492/94 1994-07-28

Publications (1)

Publication Number Publication Date
WO1996003606A1 true WO1996003606A1 (en) 1996-02-08

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AT (1) AT400882B (en)
AU (1) AU2971895A (en)
WO (1) WO1996003606A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463420A (en) * 1945-09-24 1949-03-01 Prassel Victor Deep well drilling device
GB2139938A (en) * 1983-03-31 1984-11-21 Daly Limited P N Improvements in or relating to methods and apparatus for pipe replacement and boring
GB2164718A (en) * 1984-09-19 1986-03-26 Ian Roland Yarnell Mole

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463420A (en) * 1945-09-24 1949-03-01 Prassel Victor Deep well drilling device
GB2139938A (en) * 1983-03-31 1984-11-21 Daly Limited P N Improvements in or relating to methods and apparatus for pipe replacement and boring
GB2164718A (en) * 1984-09-19 1986-03-26 Ian Roland Yarnell Mole

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AU2971895A (en) 1996-02-22
AT400882B (en) 1996-04-25
ATA149294A (en) 1995-08-15

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