EP0331978B1 - Drill pipe for a hydraulic down-hole drill hammer - Google Patents

Drill pipe for a hydraulic down-hole drill hammer Download PDF

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Publication number
EP0331978B1
EP0331978B1 EP89103122A EP89103122A EP0331978B1 EP 0331978 B1 EP0331978 B1 EP 0331978B1 EP 89103122 A EP89103122 A EP 89103122A EP 89103122 A EP89103122 A EP 89103122A EP 0331978 B1 EP0331978 B1 EP 0331978B1
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EP
European Patent Office
Prior art keywords
channel
tube
inner tube
end position
chamber
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
EP89103122A
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German (de)
French (fr)
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EP0331978A3 (en
EP0331978A2 (en
Inventor
Herbert Burgdorf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Salzgitter Maschinenbau GmbH
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Salzgitter Maschinenbau GmbH
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Publication date
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Publication of EP0331978A2 publication Critical patent/EP0331978A2/en
Publication of EP0331978A3 publication Critical patent/EP0331978A3/en
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Classifications

    • 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
    • E21B21/10—Valve arrangements in drilling-fluid circulation 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/18—Pipes provided with plural fluid passages
    • 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
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation 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

Definitions

  • the invention relates to a follow-up drill pipe according to the preamble of claim 1.
  • each supplementary drill rod 60a, 60b has an automatic valve 65 for the pressure fluid in the inner channel 30 and a further automatic valve 65 for the return fluid in the intermediate channel 40 at each end.
  • all four valves 65 open immediately, so that a certain amount of liquid can escape.
  • liquid leaks are inevitable when separating two extension boring bars 60a, 60b.
  • the free flow cross section of the inner channel 30 and the intermediate channel 40 becomes unfavorable through the valves 65 decreased.
  • valves 65 are complicated and of relatively low mass, so that liquid vibrations in the inner (30) and intermediate channel 40 can be transmitted to the valves 65 by the pulsating down-hole hammer and damage the valves.
  • the follow-up drill pipe 60 In the event of a leak on a follow-up drill rod 60a, 60b, the follow-up drill pipe 60 must be pulled out of the borehole and the damage site must be laboriously searched for with continuous loss of fluid.
  • the invention has for its object to simplify the NachsetzbohrgestCode and its handling and to limit leakages to a minimum.
  • the hydraulic fluid drives the down-the-hole hammer and can be made available and returned in a sufficient amount of time because, according to the invention, relatively large free cross sections are created both in the inner channel and in the intermediate channel. As a result, the diameter of the additional drill pipe can be kept relatively small for a given power.
  • the valve assembly at the ends of each post boring bar has been significantly improved. Part of the valve device are the entire inner tubes, which are only axially displaced with one another after the complete coupling of the supplementary boring bars and only then release the flow paths for pressure fluid and return fluid. Because of the relatively large mass of the inner tubes as moving valve parts, these are practically not influenced by operating vibrations in the liquid columns.
  • each valve device is automatically closed when the add-on drill rod is uncoupled.
  • the coupling sleeve can e.g. be screwed into the intermediate pipe and allows a quick and easy replacement of all essential seals in the area of the valve device. Maintenance and repair of the extension boring bars are greatly facilitated.
  • the extension of the inner tube according to claim 10 results in a resulting hydraulic holding force by the hydraulic fluid in the coupled state. It is coupled and uncoupled without hydraulic fluid flowing through. This protects the seals and prevents leaks.
  • Hydraulic fluid is particularly suitable as the actuating fluid.
  • the actuation of the valve devices is thus independent of the delivery pressure of the hydraulic fluid.
  • the flushing medium in particular Compressed air to be provided in sufficiently large flow cross sections.
  • the inner tubes as parts of the valve devices are also held in their second or opening end position when there is a brief shutdown or drop in the delivery pressure of the pressure fluid.
  • the locking device helps to prevent the inner tubes from being influenced by operating vibrations in the liquid columns.
  • FIG. 1 shows a follow-up drill rod 1, the movable parts of which are to the left of the longitudinal axis 2 in an uncoupled first end position and to the right of the longitudinal axis 2 in a coupled second end position.
  • Fig. 1 of the drill rod 1 are a drill rod 3 and an adjacent drill rod 3 'shown.
  • the individual parts of the add-on boring bars 3, 3 'and other, in Fig. 1, not shown add-on boring bars are identical, so that they are provided with the same reference numerals.
  • a connector 4 for a hydraulically driven down hole hammer 5 is attached, the main part of which has been omitted in Fig. 1, since it is of a known type.
  • Each post boring bar 3, 3 has an inner tube 7 enclosing an inner channel 6 for hydraulic fluid, an intermediate tube 9 defining an intermediate channel 8 for return fluid with the inner tube 7 and an outer channel 10 for a flushing medium, e.g. Compressed air, defining outer tube 11.
  • a flushing medium e.g. Compressed air
  • connection piece 12 With the lower end of the outer tube 11 of the extension boring bar 3 'a connection piece 12 is welded, which is screwed into a connecting sleeve 13 of the extension boring bar 3 with a conical, preferably multi-start thread.
  • the connecting piece 12 of the extension boring bar 3 is screwed into a connecting sleeve 14 of the connecting piece 4.
  • an outer tube 15 of the down-the-hole hammer 5 is screwed in a sealed manner in a manner known per se.
  • a percussion piston 17 of the down-the-hole hammer 5 is guided in a manner known per se.
  • the percussion piston 17 is provided with a central bore 18 for the flushing medium.
  • the connecting sleeve 13 is formed in one piece with an upper part 19 of the intermediate tube 9 to simplify production.
  • the actual intermediate tube 9 is welded along a weld 20.
  • the outer tube 11 is welded to the connecting sleeve 13 along a weld seam 21.
  • four openings 22 are provided for the flushing medium, distributed over the circumference.
  • the intermediate tube 9 is held at least approximately the same radial distance from the outer tube 11 by means not shown. Such means are e.g. disclosed in DE 3015695.
  • the intermediate pipe 9 of the extension boring bar 3 protrudes from the bottom of the connecting piece 12 and into a receiving opening 23 of the connecting piece 4, against which it is sealed by a seal 24.
  • the coupling sleeve 26 is screwed along a thread 27 into the upper part 19 until its lower end comes to rest in a shoulder 28 of the upper part 19.
  • the coupling sleeve is sealed from the upper part 19 by a seal 29.
  • the coupling sleeve 26 forms part of the intermediate tube 9 and has on its inside a first connecting channel 30 which extends in the circumferential direction as an annular groove.
  • Each inner tube 7 can be displaced in the direction of the longitudinal axis 2 relative to the intermediate tube 9 between the first end position shown on the left of the longitudinal axis 2 in FIG. 1 and the second end position shown on the right of the longitudinal axis 2 in FIG. 1.
  • Each inner tube 7 has an impermeable end wall 33 and 34 and a valve head 35 and 36 at each end.
  • Each valve head is provided with four openings 37 and 38 which are evenly distributed over the circumference.
  • valve head 35 In the first end position, the valve head 35 is sealed off from the coupling sleeve 26 of the intermediate tube 9 by seals 39 and 40. In the first end position, the valve head 36 is also sealed by seals 41 and 42 with respect to the lower end of the intermediate tube 9 of its own extension drill rod 3, 3 '.
  • valve head 35 is sealed by the seal 40 with respect to the coupling sleeve 26 of the intermediate tube 9 of its own extension drill rod 3, 3 '.
  • the other valve head 36 is sealed by the seal 42 either with respect to the coupling sleeve 26 of the intermediate tube 9 of the next adjustment drill rod 3 or with a receiving opening 43 of the connector 4.
  • the end walls 33, 34 of adjacent post-boring bars 3, 3 ' abut one another, the lateral openings 37, 38 of the adjacent valve heads 35, 36 are connected to one another via the first connecting channel 30 in the coupling sleeve 26.
  • the inner channels 6 of adjacent drill rods 3, 3 ' are connected to one another in this second end position.
  • the openings 38 of the valve head 36 of the lowermost add-on drill rod 3 are connected via an annular recess 44 in the receiving opening 43 to a feed channel 45 of the connecting piece 4.
  • the hydraulic fluid is fed to the down-the-hole hammer 5 in a manner known per se .
  • Each inner tube 7 is in the first end position with an outer projection 46 on a stop surface 47 of the coupling sleeve 26 of the inner tube 9 of its own extension drill rod 3, 3 '.
  • the outer projection 46 is designed as an annular collar which is interrupted several times on its circumference in order to allow the return liquid to pass in the second end position.
  • Each inner tube 7 is biased into the first end position by a return spring 48.
  • the return spring 48 is supported on the one hand on an outer support surface 49 of the inner tube 7 and on the other hand on an inner support 50 of the intermediate tube 9.
  • the inner support 50 is located at the transition from the upper part 19 to the actual intermediate tube 9 and has axial openings 51 for the return liquid.
  • a stop sleeve 52 is also inserted for a lower travel limitation of the outer projection 46.
  • the coupling sleeve 26 has at its outer axial end an insertion funnel 54 for the intermediate tube 9 of the adjacent post boring bar 3 '. This facilitates the coupling of the drill rods 3, 3 'together.
  • FIG. 3 shows the lower end of the down-the-hole hammer 5 following the lower end of FIG. 1.
  • a guide sleeve 55 for an insertion end 56 of an impact drilling tool 57 is screwed onto the housing 16.
  • the percussion drilling tool 57 has a flushing channel system 58 which is supplied with flushing medium through the bore 18.
  • a connecting piece 63 of the output shaft 60 is screwed into an upper connecting sleeve 62 of the connecting piece 59. Above the connecting piece 63, the output shaft 60 runs in a non-rotatable hub 64 of a rotary feedthrough 65. Above the rotary feedthrough 65, the output shaft 60 is provided with only indicated, known longitudinal teeth which are in engagement with a hollow shaft gear of the rotary drive 61, which is also known per se.
  • the rotary drive 61 can be advanced and retracted in a manner known per se along a mount (not shown). When the rotary drive 61 is advanced, in addition to the rotation about the longitudinal axis 2 the downward drilling rod 1 is given a downward thrust. On the other hand, when the rotary drive 61 is pulled back, the follow-up drill rod 1 is pulled out of the borehole.
  • a central, concentric chamber 66 is formed in the output shaft 60.
  • the chamber 66 extends from the end 67 of the output shaft 60 facing the connection piece 59 into the hub 64.
  • a first end 68 of an intermediate tube 69 is kept sealed in the chamber 66 by a seal 70.
  • the intermediate tube 69 extends through the creation of an outer channel 71 for the flushing medium through an outer tube 72 of the connector 59.
  • a second, not shown, lower end of the intermediate tube 69 is, as mentioned, corresponding to the lower end of the intermediate tube 9 of the extension boring bars 3, 3 '.
  • An inner tube 74 extends into the chamber 66 and through the intermediate tube 69, creating an intermediate channel 73 for the return liquid.
  • the inner tube 74 defines an inner channel 75 for the pressure fluid and is in the direction of the longitudinal axis 2 relative to the intermediate tube 69 between the aforementioned first End position and the aforementioned second end position can be moved.
  • first lower end of the inner tube 74 is, as mentioned, formed in the same way as the lower end of the inner tube 7 of the drill rods 3, 3 'and acts in the same way in the two end positions with the second end of the intermediate tube 69 together.
  • a second end 76 of the inner tube 74 is sealed on the outside from a wall 77 of the chamber 66 by seals 78 and 79 and can be pushed into the second end position by an actuating fluid.
  • the hydraulic fluid is used as the actuating fluid.
  • the hydraulic fluid is supplied to the hub 64 at a hydraulic fluid connection 80, sealed by seals 81 and 82.
  • the second end 76 of the inner tube 74 is sealed off from the wall 77 by a bushing 83 which is inserted into the chamber 66 and carries the seals 78, 79 and is guided in the radial direction.
  • the socket 83 is supported at the bottom on the first end 68 of the intermediate tube 69 and at the top on a spacer sleeve 84.
  • a pressure fluid space 85 is defined by the socket 83 within the chamber 66 and is connected to the pressure fluid connection 80 via bores 86 in the output shaft 60.
  • a return space 87 of the chamber 66 which cannot be acted upon by the pressure fluid is constantly connected on the one hand to the intermediate channel 73 and on the other hand to a return connection 88 of the hub 64.
  • the return port 88 is sealed off from the output shaft 60 by seals 89 and 90 and is connected to the return chamber 87 by bores 91 in the output shaft 60.
  • the inner channel 75 widens towards the second end 76 of the inner tube 74.
  • An annular end edge 92 of the second end 76 interacts as a valve body with a valve seat 94 which is movably mounted in the direction of the longitudinal axis 2 and is biased by a spring 93 in an opening direction.
  • the valve seat 94 has radial webs 95 on its upper side, which always keep the valve seat 94 at a distance from an end wall 96 of the chamber 66. Thus, the upper surface of the valve seat 94 is always connected to the pressure fluid connection 80.
  • the valve seat 94 moves against a stop 98, which is axially stationary relative to the output shaft 60, on the upper side of the bushing 83.
  • the annular end edge 92 is lifted off the valve seat 94 and the valve seat 94 by the spring 93 moved back to its starting position in the opening direction.
  • the hydraulic fluid can in this way Inflow inner channel 75. Because of the expansion of the inner tube 74 at its upper end, the pressure fluid exerts a downward resulting holding force on the strand of the inner tube 74, 7. This holding force holds the strand of the inner tubes 74, 7 in its second end position against the force of the return springs 48, 97.
  • flushing channels 99 are provided in the wall of the output shaft 60, which connect a flushing connection 100 of the hub 64, sealed by seals 101 and 102, to the outer channel 71 of the connecting piece 59.
  • the second end position of the string of inner tubes 74, 7 held by the pressure fluid in the aforementioned manner is secured by a mechanical locking device 103. Without the locking device 103, if the pressure fluid was briefly switched off or the pressure of the pressure fluid dropped, the strand of the inner tubes 74, 7 would immediately move upward in the direction of the first end position under the action of the return springs 48, 97. When the hydraulic fluid pressure was rebuilt, the strand of the inner tubes 74, 7 would then move again in the direction of the second end position. Such axial movements of the inner tubes 74, 7 due to pressure fluctuations or failures are undesirable because they lead to unnecessary wear and the supply of hydraulic fluid to the down-the-hole hammer 5. The locking device 103 prevents these disadvantages.
  • the locking device 103 has an axially fixed at the second end 76 of the inner tube 74 the output shaft 60 extends through rod 104.
  • the rod 104 is sealed off from the output shaft 60 by a seal 105.
  • the valve seat 94 is slidably mounted on the rod 104.
  • a bushing 106 is screwed with an outer, radial groove 107 formed as an annular groove.
  • a plurality of locking elements 108 designed as balls and locked with respect to the output shaft 60, engage in the recess 107.
  • the locking elements 108 are actuated by a locking sleeve 109 held displaceably on the output shaft 60.
  • the locking sleeve 109 is biased by a spring 110 into a locking position activating the locking elements 108.
  • the locking sleeve 109 has on the inside an extension 111 designed as an annular groove, which receives the locking elements 108 in an axial release position of the locking sleeve 109.
  • the locking sleeve 109 is drawn in its lower, locking position on the right side of the longitudinal axis 2.
  • the locking is only released when the rotary drive 61 is retracted upwards in FIG. 4.
  • the rotary drive 61 abuts a lower stop surface 112 of the locking sleeve 109 and pushes the locking sleeve 109 upwards until the lock is released.
  • the pressure fluid at the pressure fluid connection 80 is normally already switched off, so that the inner tubes 74, 7 can immediately move into their first end position under the action of the return springs 48, 97.
  • the elements of the locking device 103 then take those shown on the left in FIG. 1 Relative positions.
  • the lower end of the rod 104 has a head 113 which extends outward into contact with the inner tube 74 and is fixed there in the axial direction by a locking ring 114.
  • the head 113 has axial openings 115 for the pressure fluid.
  • Fig. 5 shows important items of the drill rod 3 and the neighboring drill rod 3 'in a separate representation.
  • Each inner tube 7 is provided below the openings 37 with a shoulder 116, from which the inner tube 7 has a larger diameter downwards.
  • the mechanical locking device 103 (FIG. 4) can be relieved during operation of the supplementary drill rod 1.
  • FIG. 6 shows a different type of axial displacement of the inner tube 74 compared to FIG. 4.
  • the same parts as in FIG. 4 are provided with the same reference numbers in FIG. 6.
  • the second end 76 of the inner tube 74 is designed as a piston and is guided in a sealed manner in a cylinder space 117 of the chamber 66 by a seal 118.
  • a stepped, annular end face 119 of the second end 76 is continuously connected to an actuating fluid connection 120 of the hub 64.
  • the end of the rod 104 of the locking device 103 is screwed into the second end 76 from above.
  • the strand can be moved axially out of the inner tubes 74, 7 by controlling the actuating fluid at the actuating fluid connection 120 independently of the pressure fluid at the pressure fluid connection 80.

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

Description

Die Erfindung betrifft ein Nachsetzbohrgestänge gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a follow-up drill pipe according to the preamble of claim 1.

Bei einem bekannten Nachsetzbohrgestänge 60 dieser Art (EP-B1-0022865) weist jede Nachsetzbohrstange 60a, 60b an jedem Ende ein selbsttätiges Ventil 65 für die Druckflüssigkeit in dem Innenkanal 30 und ein weiteres selbsttätiges Ventil 65 für die Rücklaufflüssigkeit in dem Zwischenkanal 40 auf. Beim Kuppeln zweier Nachsetzbohrstangen 60a, 60b öffnen alle vier Ventile 65 sofort, so daß eine gewisse Flüssigkeitsmenge austreten kann. Aus dem gleichen Grund sind Flüssigkeitsleckagen beim Trennen zweier Nachsetzbohrstangen 60a, 60b unvermeidlich. Durch die Ventile 65 wird der freie Strömungsquerschnitt des Innenkanals 30 und des Zwischenkanals 40 ungünstig verringert. Ferner sind die Ventile 65 kompliziert und von verhältnismäßig geringer Masse, so daß durch den pulsierenden Imlochbohrhammer sich Flüssigkeitsschwingungen in dem Innen- (30) und Zwischenkanal 40 auf die Ventile 65 übertragen und die Ventile beschädigen können. Bei einer Undichtigkeit an einer Nachsetzbohrstange 60a, 60b muß das Nachsetzbohrgestänge 60 aus dem Bohrloch gezogen und die Schadenstelle unter fortdauerndem Flüssigkeitsverlust mühsam gesucht werden.In a known supplementary drill pipe 60 of this type (EP-B1-0022865), each supplementary drill rod 60a, 60b has an automatic valve 65 for the pressure fluid in the inner channel 30 and a further automatic valve 65 for the return fluid in the intermediate channel 40 at each end. When two add-on boring bars 60a, 60b are coupled, all four valves 65 open immediately, so that a certain amount of liquid can escape. For the same reason, liquid leaks are inevitable when separating two extension boring bars 60a, 60b. The free flow cross section of the inner channel 30 and the intermediate channel 40 becomes unfavorable through the valves 65 decreased. Furthermore, the valves 65 are complicated and of relatively low mass, so that liquid vibrations in the inner (30) and intermediate channel 40 can be transmitted to the valves 65 by the pulsating down-hole hammer and damage the valves. In the event of a leak on a follow-up drill rod 60a, 60b, the follow-up drill pipe 60 must be pulled out of the borehole and the damage site must be laboriously searched for with continuous loss of fluid.

Der Erfindung liegt die Aufgabe zugrunde, das Nachsetzbohrgestänge und seine Handhabung zu vereinfachen und Leckagen auf ein Minimum zu beschränken.The invention has for its object to simplify the Nachsetzbohrgestänge and its handling and to limit leakages to a minimum.

Diese Aufgabe ist durch die Merkmale des Anspruchs 1 gelöst. Die Druckflüssigkeit treibt den Imlochbohrhammer an und kann in ausreichender zeitlicher Menge bereitgestellt und rückgeführt werden, weil erfindungsgemäß verhältnismäßig große freie Querschnitte sowohl im Innenkanal als auch im Zwischenkanal geschaffen sind. Dadurch kann bei gegebener Leistung der Durchmesser des Nachsetzbohrgestänges verhältnismäßig klein gehalten werden. Die Ventilvorrichtung an den Enden jeder Nachsetzbohrstange wurde entscheidend verbessert. Bestandteil der Ventilvorrichtung sind die gesamten Innenrohre, die erst nach der vollständigen Kupplung der Nachsetzbohrstangen miteinander axial verschoben werden und erst dann die Strömungswege für Druckflüssigkeit und Rücklaufflüssigkeit freigeben. Wegen der verhältnismäßig großen Masse der Innenrohre als bewegte Ventilteile werden diese durch Betriebsschwingungen in den Flüssigkeitssäulen praktisch nicht beeinflußt. Dadurch werden Beanspruchung und Verschleiß der Ventilteile stark herabgesetzt. Bei einer Trennung von Nachsetzbohrstangen entweder voneinander oder vom Anschlußstück dem Imlochbohrhammers oder vom Anschlußstück des Drehantriebs werden zunächst sämtliche Ventilvorrichtung gleichzeitig durch Verschiebung aller Innenrohre geschlossen, so daß die eigentliche Trennung bei voll geschlossenem und abgedichteten Flüssigkeitssystem erfolgt. Dadurch entstehen nur äußerst geringe Leckmengen der Flüssigkeit als Ablauf jetzt freier und bis dahin von der Flüssigkeit benetzter Flächen. Sollte eine Nachsetzbohrstange oder der Imlochbohrhammer leck werden, braucht der Bedienungsmann nicht das gesamte Nachsetzbohrgestänge auszubauen, bevor keine Flüssigkeit mehr verloren wird. Vielmehr schließt der Bedienungsmann durch gleichzeitige axiale Verschiebung aller Innenrohre gleichzeitig sämtliche Ventile, so daß von diesem Zeitpunkt an Flüssigkeit allenfalls noch aus dem defekten Element des Nachsetzbohrgestänges austreten kann jedoch nicht mehr aus den weiterhin einwandfreien Elementen des Nachsetzbohrgestänges. Dadurch wird der potentielle Flüssigkeitsverlust bei einer Leckage stark herabgesetzt.This object is solved by the features of claim 1. The hydraulic fluid drives the down-the-hole hammer and can be made available and returned in a sufficient amount of time because, according to the invention, relatively large free cross sections are created both in the inner channel and in the intermediate channel. As a result, the diameter of the additional drill pipe can be kept relatively small for a given power. The valve assembly at the ends of each post boring bar has been significantly improved. Part of the valve device are the entire inner tubes, which are only axially displaced with one another after the complete coupling of the supplementary boring bars and only then release the flow paths for pressure fluid and return fluid. Because of the relatively large mass of the inner tubes as moving valve parts, these are practically not influenced by operating vibrations in the liquid columns. As a result, stress and wear on the valve parts are greatly reduced. If the extension boring bars are separated from each other or from the connector, the down-the-hole hammer or from the connector of the rotary drive, all valve devices are initially closed simultaneously by shifting all the inner tubes, so that the actual separation takes place with the liquid system fully closed and sealed. As a result, only extremely small amounts of liquid leakage occur as drainage now free and wet surfaces. In the event that a follow-up drill rod or the down-the-hole hammer is leaking, the operator does not need to remove the entire follow-up drill pipe before no more liquid is lost. Rather, the operator closes all valves at the same time by simultaneous axial displacement of all inner tubes, so that from this point on liquid at most can still escape from the defective element of the supplementary drill rod, but can no longer emerge from the still perfect elements of the supplementary drill rod. This greatly reduces the potential loss of fluid in the event of a leak.

Gemäß Anspruch 2 gelangt die Druckflüssigkeit auf einfache Weise zu dem Imlochbohrhammer.According to claim 2, the hydraulic fluid reaches the downhole hammer in a simple manner.

Durch die Merkmale des Anspruchs 3 ist jede Ventilvorrichtung bei entkuppelter Nachsetzbohrstange selbsttätig verschlossen.Due to the features of claim 3, each valve device is automatically closed when the add-on drill rod is uncoupled.

Gemäß Anspruch 4 sind Herstellung und Handhabung der Nachsetzbohrstange erheblich erleichtert. Die Kupplungshülse kann z.B. in das Zwischenrohr eingeschraubt sein und gestattet einen schnellen und mühelosen Austausch aller wesentlichen Dichtungen im Bereich der Ventilvorrichtung. So sind Wartung und Reparatur der Nachsetzbohrstangen stark erleichtert.According to claim 4 manufacture and handling of the post boring bar are considerably facilitated. The coupling sleeve can e.g. be screwed into the intermediate pipe and allows a quick and easy replacement of all essential seals in the area of the valve device. Maintenance and repair of the extension boring bars are greatly facilitated.

Gemäß Anspruch 5 ergibt sich eine sichere Kupplung benachbarter Zwischenrohre. Die von der Flüssigkeit benetzten und nach der Entkupplung freien Oberflächen dieser Verbindung sind äußerst gering, führen zu entsprechend geringen Flüssigkeitsleckmengen und sind wegen ihrer glatten Oberflächen leicht zu reinigen bzw. sauberzuhalten.According to claim 5, there is a secure coupling of adjacent intermediate pipes. The wetted by the liquid and after the uncoupling, free surfaces of this connection are extremely small, lead to correspondingly small amounts of liquid leakage and are easy to clean or keep clean because of their smooth surfaces.

Die Merkmale des Anspruchs 6 dienen der leichteren Kupplung der Elemente des Nachsetzbohrgestänges.The features of claim 6 serve the easier coupling of the elements of the extension drill pipe.

Gemäß Anspruch 7 ist eine einfache und betriebssichere Kupplung der letzten Nachsetzbohrstange mit dem Drehantrieb geschaffen. Auch in diesem Bereich stehen für alle Kanäle ausreichend große Strömungsquerschnitte zur Verfügung. Die Verschiebung des Innenrohrs im Bereich der Drehdurchführung erfolgt gegen und durch Federkraft.According to claim 7, a simple and reliable coupling of the last post boring bar with the rotary drive is created. Sufficiently large flow cross sections are also available in this area for all channels. The inner tube is shifted in the area of the rotating union against and by spring force.

Die Merkmale des Anspruchs 8 dienen zur einfachen und betriebssicheren Unterteilung der Kammer und zur sicheren Führung des Innenrohrs.The features of claim 8 are used for simple and reliable division of the chamber and for safe guidance of the inner tube.

Gemäß Anspruch 9 ist eine betriebssichere Führung der Rücklaufflüssigkeit gewährleistet.According to claim 9, reliable operation of the return liquid is guaranteed.

Durch die Erweiterung des Innenrohrs gemäß Anspruch 10 ergibt sich eine resultierende hydraulische Haltekraft durch die Druckflüssigkeit im gekuppelten Zustand. Es wird ohne durchströmende Druckflüssigkeit gekuppelt und entkuppelt. Dadurch werden die Dichtungen geschont und Leckagen vermieden.The extension of the inner tube according to claim 10 results in a resulting hydraulic holding force by the hydraulic fluid in the coupled state. It is coupled and uncoupled without hydraulic fluid flowing through. This protects the seals and prevents leaks.

Als Betätigungsfluid gemäß Anspruch 11 kommt insbesondere Hydraulikflüssigkeit in Betracht. So ist die Betätigung der Ventilvorrichtungen unabhängig von dem Lieferdruck der Druckflüssigkeit.Hydraulic fluid is particularly suitable as the actuating fluid. The actuation of the valve devices is thus independent of the delivery pressure of the hydraulic fluid.

Gemäß Anspruch 12 ist auch das Spülmedium, insbesondere Druckluft, in ausreichend großen Strömungsquerschnitten bereitzustellen.According to claim 12 is the flushing medium, in particular Compressed air to be provided in sufficiently large flow cross sections.

Durch die Verriegelungsvorrichtung gemäß Anspruch 13 werden die Innenrohre als Teile der Ventilvorrichtungen auch dann in ihrer zweiten oder öffnenden Endstellung gehalten, wenn es zu kurzzeitigem Abschalten oder Absinken des Lieferdrucks der Druckflüssigkeit kommt. Außerdem trägt die Verriegelungsvorrichtung dazu bei, daß eine Beeinflussung der Innenrohre durch Betriebsschwingungen in den Flüssigkeitssäulen verhindert wird.By the locking device according to claim 13, the inner tubes as parts of the valve devices are also held in their second or opening end position when there is a brief shutdown or drop in the delivery pressure of the pressure fluid. In addition, the locking device helps to prevent the inner tubes from being influenced by operating vibrations in the liquid columns.

Die Merkmale des Anspruchs 14 führen zu einer konstruktiv besonders vorteilhaften Verriegelungsvorrichtung, die außerdem eine optische Kontrolle der axialen Stellung der Innenrohre und damit der Ventilvorrichtungen ermöglicht.The features of claim 14 lead to a structurally particularly advantageous locking device, which also enables visual control of the axial position of the inner tubes and thus the valve devices.

Gemäß Anspruch 16 ist die Handhabung weiter abgesichert und vereinfacht.According to claim 16, the handling is further secured and simplified.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung anhand der Zeichnungen. Es zeigt:

  • Fig. 1 einen Längsschnitt durch einen Teil eines Nachsetzbohrgestänges, links und rechts von der Längsachse in unterschiedlichen Endstellungen,
  • Fig. 2 die Schnittansicht nach Linie II-II in Fig. 1 in vergrößerter Darstellung,
  • Fig. 3 einen Längsschnitt durch das untere Ende eines an das nachsetzbohrgestänge gemäß Fig. 1 angeschlossenen Imlochbohrhammers,
  • Fig. 4 einen Längsschnitt durch ein Anschlußstück und eine Drehdurchführung am oberen Ende des Nachsetzbohrgestänges gemäß Fig. 1, wiederum je zur Hälfte in den beiden Endstellungen,
  • Fig. 5 einen Längsschnitt durch die Enden benachbarter Nachsetzbohrstangen in gegenüber Fig. 1 getrennter Darstellung und
  • Fig. 6 einen Längsschnitt entsprechend Fig. 4 durch eine andere Ausführungsform der Drehdurchführung.
Further features and advantages of the invention result from the following description of exemplary embodiments of the invention with reference to the drawings. It shows:
  • 1 shows a longitudinal section through part of a follow-up drill string, left and right of the longitudinal axis in different end positions,
  • 2 shows the sectional view along line II-II in FIG. 1 in an enlarged view,
  • 3 shows a longitudinal section through the lower end of an in-hole hammer drill connected to the subsequent drilling rod according to FIG. 1,
  • 4 shows a longitudinal section through a connecting piece and a rotary feedthrough at the upper end of the extension drill rod according to FIG. 1, again in each case half in the two end positions,
  • Fig. 5 shows a longitudinal section through the ends of adjacent Nachsetzbohrstangen in comparison with FIG. 1 and
  • Fig. 6 is a longitudinal section corresponding to Fig. 4 through another embodiment of the rotary union.

Fig. 1 zeigt ein Nachsetzbohrgestänge 1, dessen bewegliche Teile sich links von der Längsachse 2 in einer ungekuppelten ersten Endstellung und rechts von der Längsachse 2 in einer gekuppelten zweiten Endstellung befinden. In Fig. 1 sind von dem Nachsetzbohrgestänge 1 eine Nachsetzbohrstange 3 und eine benachbarte Nachsetzbohrstange 3′ gezeigt. Die Einzelteile der Nachsetzbohrstangen 3, 3′ und weiterer, in Fig. 1 nicht gezeichneter Nachsetzbohrstangen sind identisch, so daß sie mit gleichen Bezugszahlen versehen sind.1 shows a follow-up drill rod 1, the movable parts of which are to the left of the longitudinal axis 2 in an uncoupled first end position and to the right of the longitudinal axis 2 in a coupled second end position. In Fig. 1 of the drill rod 1 are a drill rod 3 and an adjacent drill rod 3 'shown. The individual parts of the add-on boring bars 3, 3 'and other, in Fig. 1, not shown add-on boring bars are identical, so that they are provided with the same reference numerals.

An das untere Ende der Nachsetzbohrstange 3 ist ein Anschlußstück 4 für einen hydraulisch angetriebenen Imlochbohrhammer 5 angesetzt, dessen Hauptteil in Fig. 1 fortgelassen wurde, da der von an sich bekannter Bauart ist.At the lower end of the Nachsetzbohrstange 3 is a connector 4 for a hydraulically driven down hole hammer 5 is attached, the main part of which has been omitted in Fig. 1, since it is of a known type.

Jede Nachsetzbohrstange 3, 3′ weist ein einen Innenkanal 6 für Druckflüssigkeit umschließendes Innenrohr 7, ein mit dem Innenrohr 7 einen Zwischenkanal 8 für Rücklaufflüssigkeit definierendes Zwischenrohr 9 und ein mit dem Zwischenrohr 9 einen Außenkanal 10 für ein Spülmedium, z.B. Druckluft, definierendes Außenrohr 11 auf.Each post boring bar 3, 3 'has an inner tube 7 enclosing an inner channel 6 for hydraulic fluid, an intermediate tube 9 defining an intermediate channel 8 for return fluid with the inner tube 7 and an outer channel 10 for a flushing medium, e.g. Compressed air, defining outer tube 11.

Die Strömungsrichtungen der vorerwähnten Medien sind in Fig. 1 mit Pfeilen angedeutet. Die Druckflüssigkeit dient zum Antrieb des Imlochbohrhammers 5 und wird nach dortiger Arbeitsleistung als Rücklaufflüssigkeit in dem Zwischenkanal 8 zurückgeleitet.The flow directions of the aforementioned media are indicated with arrows in FIG. 1. The hydraulic fluid is used to drive the down-the-hole hammer 5 and is returned as return fluid in the intermediate channel 8 after work there.

Mit dem unteren Ende des Außenrohrs 11 der Nachsetzbohrstange 3′ ist ein Anschlußstutzen 12 verschweißt, der mit einem konischen, vorzugsweise mehrgängigen Gewinde in eine Anschlußmuffe 13 der Nachsetzbohrstange 3 eingeschraubt ist. Der Anschlußstutzen 12 der Nachsetzbohrstange 3 ist in eine Anschlußmuffe 14 des Anschlußstücks 4 eingeschraubt.With the lower end of the outer tube 11 of the extension boring bar 3 'a connection piece 12 is welded, which is screwed into a connecting sleeve 13 of the extension boring bar 3 with a conical, preferably multi-start thread. The connecting piece 12 of the extension boring bar 3 is screwed into a connecting sleeve 14 of the connecting piece 4.

Mit dem unteren Ende des Anschlußstücks 4 ist in an sich bekannter Weise ein Außenrohr 15 des Imlochbohrhammers 5 abgedichtet verschraubt. In einem Gehäuse 16 des Imlochbohrhammers 5 ist, durch die Druckflüssigkeit antreibbar, ein Schlagkolben 17 des Imlochbohrhammers 5 geführt. In an sich bekannter Weise ist der Schlagkolben 17 mit einer mittigen Bohrung 18 für das Spülmedium versehen.With the lower end of the connecting piece 4, an outer tube 15 of the down-the-hole hammer 5 is screwed in a sealed manner in a manner known per se. In a housing 16 of the down-the-hole hammer 5, driven by the hydraulic fluid, a percussion piston 17 of the down-the-hole hammer 5 is guided. In a manner known per se, the percussion piston 17 is provided with a central bore 18 for the flushing medium.

Bei dem Ausführungsbeispiel nach Fig. 1 ist zur Fertigungsvereinfachung die Anschlußmuffe 13 einstückig mit einem oberen Teil 19 des Zwischenrohrs 9 ausgebildet. Mit diesem oberen Teil 19 ist das eigentliche Zwischenrohr 9 längs einer Schweißnaht 20 verschweißt. Das Außenrohr 11 ist mit der Anschlußmuffe 13 längs einer Schweißnaht 21 verschweißt. Am Übergang von der Anschlußmuffe 13 in das obere Teil 19 sind über den Umfang verteilt vier Durchbrechungen 22 (Fig. 2) für das Spülmedium vorgesehen.In the embodiment of FIG. 1, the connecting sleeve 13 is formed in one piece with an upper part 19 of the intermediate tube 9 to simplify production. With this upper part 19, the actual intermediate tube 9 is welded along a weld 20. The outer tube 11 is welded to the connecting sleeve 13 along a weld seam 21. At the transition from the connecting sleeve 13 into the upper part 19, four openings 22 (FIG. 2) are provided for the flushing medium, distributed over the circumference.

Das Zwischenrohr 9 wird durch nicht dargestellte Mittel in zumindest annähernd gleichbleibendem radialen Abstand von dem Außenrohr 11 gehalten. Solche Mittel sind z.B. in der DE-Offenlegungsschrift 3015695 offenbart.The intermediate tube 9 is held at least approximately the same radial distance from the outer tube 11 by means not shown. Such means are e.g. disclosed in DE 3015695.

Das Zwischenrohr 9 der Nachsetzbohrstange 3 ragt unten aus dem Anschlußstutzen 12 heraus und in eine Aufnahmeöffnung 23 des Anschlußstücks 4 hinein, gegenüber der es durch eine Dichtung 24 abgedichtet ist.The intermediate pipe 9 of the extension boring bar 3 protrudes from the bottom of the connecting piece 12 and into a receiving opening 23 of the connecting piece 4, against which it is sealed by a seal 24.

In ähnlicher Weise ragt ein unteres Ende des Zwischenrohrs 9 der Nachsetzbohrstange 3′ in eine Aufnahmeöffnung 25 einer Kupplungshülse 26 hinein. Die Kupplungshülse 26 ist längs eines Gewindes 27 in das obere Teil 19 soweit eingeschraubt, bis ihr unteres Ende zur Anlage in einer Schulter 28 des oberen Teils 19 gelangt. Die Kupplungshülse ist durch eine Dichtung 29 gegenüber dem oberen Teil 19 abgedichtet. Die Kupplungshülse 26 bildet auf diese Weise einen Bestandteil des Zwischenrohrs 9 und weist an ihrer Innenseite einen ersten Verbindungskanal 30 auf, der sich als Ringnut in Umfangsrichtung erstreckt.In a similar manner, a lower end of the intermediate tube 9 of the extension drill rod 3 'projects into a receiving opening 25 of a coupling sleeve 26. The coupling sleeve 26 is screwed along a thread 27 into the upper part 19 until its lower end comes to rest in a shoulder 28 of the upper part 19. The coupling sleeve is sealed from the upper part 19 by a seal 29. In this way, the coupling sleeve 26 forms part of the intermediate tube 9 and has on its inside a first connecting channel 30 which extends in the circumferential direction as an annular groove.

Zwischen der Kupplungshülse 26 und dem oberen Teil 19 ist ferner ein ringnutartiger zweiter Verbindungskanal 31 ausgebildet, der ständig einerseits mit dem Zwischenkanal 8 und andererseits mit vier über den Umfang gleichmäßig verteilten Löchern 32 in der Kupplungshülse 26 verbunden ist.Between the coupling sleeve 26 and the upper part 19, an annular groove-like second connecting channel 31 is also formed, which is constantly connected on the one hand to the intermediate channel 8 and on the other hand to four holes 32 in the coupling sleeve 26 which are evenly distributed over the circumference.

Jedes Innenrohr 7 ist in Richtung der Längsachse 2 relativ zu dem Zwischenrohr 9 zwischen der in Fig. 1 links von der Längsachse 2 dargestellten ersten Endstellung und der in Fig. 1 rechts von der Längsachse 2 dargestellten zweiten Endstellung verschiebbar. Jedes Innenrohr 7 weist an jedem Ende eine undurchlässige Stirnwand 33 und 34 und einen Ventilkopf 35 und 36 auf. Jeder Ventilkopf ist mit vier über den Umfang gleichmäßig verteilten Durchbrechungen 37 und 38 versehen.Each inner tube 7 can be displaced in the direction of the longitudinal axis 2 relative to the intermediate tube 9 between the first end position shown on the left of the longitudinal axis 2 in FIG. 1 and the second end position shown on the right of the longitudinal axis 2 in FIG. 1. Each inner tube 7 has an impermeable end wall 33 and 34 and a valve head 35 and 36 at each end. Each valve head is provided with four openings 37 and 38 which are evenly distributed over the circumference.

In der ersten Endstellung ist der Ventilkopf 35 durch Dichtungen 39 und 40 gegenüber der Kupplungshülse 26 des Zwischenrohrs 9 abgedichtet. In der ersten Endstellung ist ferner der Ventilkopf 36 durch Dichtungen 41 und 42 gegenüber dem unteren Ende des Zwischenrohrs 9 seiner eigenen Nachsetzbohrstange 3, 3′ abgedichtet.In the first end position, the valve head 35 is sealed off from the coupling sleeve 26 of the intermediate tube 9 by seals 39 and 40. In the first end position, the valve head 36 is also sealed by seals 41 and 42 with respect to the lower end of the intermediate tube 9 of its own extension drill rod 3, 3 '.

In der zweiten Endstellung ist der Ventilkopf 35 durch die Dichtung 40 gegenüber der Kupplungshülse 26 des Zwischenrohrs 9 seiner eigenen Nachsetzbohrstange 3, 3′ abgedichtet. In der zweiten Endstellung ist der andere Ventilkopf 36 durch die Dichtung 42 entweder gegenüber der Kupplungshülse 26 des Zwischenrohrs 9 der nächsten Nachsetzbohrstange 3 oder gegenüber einer Aufnahmeöffnung 43 des Anschlußstücks 4 abgedichtet. In der zweiten Endstellung liegen die Stirnwände 33, 34 benachbarter Nachsetzbohrstangen 3, 3′ aneinander an, wobei die seitlichen Durchbrechungen 37, 38 der benachbarten Ventilköpfe 35, 36 über den ersten Verbindungskanal 30 in der Kupplungshülse 26 miteinander verbunden sind. Dadurch stehen in dieser zweiten Endstellung auch die Innenkanäle 6 benachbarter Nachsetzbohrstangen 3, 3′ miteinander in Verbindung.In the second end position, the valve head 35 is sealed by the seal 40 with respect to the coupling sleeve 26 of the intermediate tube 9 of its own extension drill rod 3, 3 '. In the second end position, the other valve head 36 is sealed by the seal 42 either with respect to the coupling sleeve 26 of the intermediate tube 9 of the next adjustment drill rod 3 or with a receiving opening 43 of the connector 4. In the second end position, the end walls 33, 34 of adjacent post-boring bars 3, 3 'abut one another, the lateral openings 37, 38 of the adjacent valve heads 35, 36 are connected to one another via the first connecting channel 30 in the coupling sleeve 26. As a result, the inner channels 6 of adjacent drill rods 3, 3 'are connected to one another in this second end position.

In der zweiten Endstellung stehen die Durchbrechungen 38 des Ventilkopfs 36 der untersten Nachsetzbohrstange 3 über eine ringförmige Ausnehmung 44 in der Aufnahmeöffnung 43 in Verbindung mit einem Zuführkanal 45 des Anschlußstücks 4. Durch den Zuführkanal 45 wird die Druckflüssigkeit dem Imlochbohrhammer 5 in an sich bekannter Weise zugeführt.In the second end position, the openings 38 of the valve head 36 of the lowermost add-on drill rod 3 are connected via an annular recess 44 in the receiving opening 43 to a feed channel 45 of the connecting piece 4. Through the feed channel 45, the hydraulic fluid is fed to the down-the-hole hammer 5 in a manner known per se .

Jedes Innenrohr 7 liegt in der ersten Endstellung mit einem äußeren Vorsprung 46 an einer Anschlagfläche 47 der Kupplungshülse 26 des Innenrohrs 9 der eigenen Nachsetzbohrstange 3, 3′ an. Der äußere Vorsprung 46 ist als ringförmiger Bund ausgebildet, der an seinem Umfang mehrfach unterbrochen ist, um der Rücklaufflüssigkeit in der zweiten Endstellung das Passieren zu ermöglichen.Each inner tube 7 is in the first end position with an outer projection 46 on a stop surface 47 of the coupling sleeve 26 of the inner tube 9 of its own extension drill rod 3, 3 '. The outer projection 46 is designed as an annular collar which is interrupted several times on its circumference in order to allow the return liquid to pass in the second end position.

Jedes Innenrohr 7 ist in die erste Endstellung durch eine Rückstellfeder 48 vorgespannt. Die Rückstellfeder 48 ist einerseits an einer äußeren Stützfläche 49 des Innenrohrs 7 und andererseits an einer inneren Stütze 50 des Zwischenrohrs 9 abgestützt. Die innere Stütze 50 befindet sich am Übergang von dem oberen Teil 19 zu dem eigentlichen Zwischenrohr 9 und weist axiale Durchbrechungen 51 für die Rücklaufflüssigkeit auf. In das obere Teil 19 ist ferner eine Anschlaghülse 52 für eine untere Wegbegrenzung des äußeren Vorsprungs 46 eingesetzt.Each inner tube 7 is biased into the first end position by a return spring 48. The return spring 48 is supported on the one hand on an outer support surface 49 of the inner tube 7 and on the other hand on an inner support 50 of the intermediate tube 9. The inner support 50 is located at the transition from the upper part 19 to the actual intermediate tube 9 and has axial openings 51 for the return liquid. In the upper part 19, a stop sleeve 52 is also inserted for a lower travel limitation of the outer projection 46.

In der ersten Endstellung sind die Löcher 32 in der Kupplungshülse 26 durch die Dichtung 39 des Ventilkopfs 35 der eigenen Nachsetzbohrstange 3, 3′ abgedichtet, so daß Rücklaufflüssigkeit nicht auslaufen kann. In der zweiten Endstellung dagegen sind die Löcher 32 durch den Ventilkopf 36 der benachbarten Nachsetzbohrstange 3′ über einen dritten Verbindungskanal 53 mit dem Zwischenkanal 8 der benachbarten Nachsetzbohrstange 3′ verbunden. So kann in der zweiten Endstellung die Rücklaufflüssigkeit durch ausreichend große Querschnitte abströmen.In the first end position, the holes 32 are in the coupling sleeve 26 through the seal 39 of the valve head 35 its own post boring bar 3, 3 'sealed so that return liquid can not leak. In the second end position, however, the holes 32 are connected through the valve head 36 of the adjacent post boring bar 3 'via a third connecting channel 53 with the intermediate channel 8 of the adjacent post boring bar 3'. In the second end position, the return liquid can flow out through sufficiently large cross sections.

Die Kupplungshülse 26 weist an ihrem äußeren axialen Ende einen Einführungstrichter 54 für das Zwischenrohr 9 der benachbarten Nachsetzbohrstange 3′ auf. Dies erleichtert das Kuppeln der Nachsetzbohrstangen 3, 3′ miteinander.The coupling sleeve 26 has at its outer axial end an insertion funnel 54 for the intermediate tube 9 of the adjacent post boring bar 3 '. This facilitates the coupling of the drill rods 3, 3 'together.

In Fig. 2 sind Einzelheiten des Nachsetzbohrgestänges 1 vergrößert dargestellt.In Fig. 2 details of the extension drill string 1 are shown enlarged.

Fig. 3 stellt im Anschluß an das untere Ende der Fig. 1 das untere Ende des Imlochbohrhammers 5 dar. Auf das Gehäuse 16 ist eine Führungshülse 55 für ein Einsteckende 56 eines Schlagbohrwerkzeugs 57 aufgeschraubt. Das Schlagbohrwerkzeug 57 weist ein Spülkanalsystem 58 auf, das durch die Bohrung 18 mit Spülmedium versorgt wird.3 shows the lower end of the down-the-hole hammer 5 following the lower end of FIG. 1. A guide sleeve 55 for an insertion end 56 of an impact drilling tool 57 is screwed onto the housing 16. The percussion drilling tool 57 has a flushing channel system 58 which is supplied with flushing medium through the bore 18.

Fig. 4 zeigt praktisch das obere Ende des Nachsetzbohrgestänges 1. Es ist ein Anschlußstück 59 für eine Abtriebswelle 60 eines nur angedeuteten Drehantriebs 61 dargestellt. Das in Fig. 4 nicht gezeichnete untere Ende des Anschlußstücks 59 ist in der gleichen Weise ausgebildet wie das in Fig. 1 gezeichnete untere Ende der benachbarten Nachsetzbohrstange 3′. Mit dem unteren Ende des Anschlußstücks 59 wird also die jeweils oberste benachbarte Nachsetzbohrstange 3′ gekuppelt. Die Länge der Nachsetzbohrstangen 3, 3′ kann z.B. 6 bis 7 m betragen.Fig. 4 shows practically the upper end of the extension drill rod 1. A connector 59 for an output shaft 60 of a rotary drive 61, only indicated, is shown. The lower end of the connecting piece 59, which is not shown in FIG. 4, is designed in the same way as the lower end of the adjacent extension drill rod 3 'shown in FIG. 1'. With the lower end of the connecting piece 59, the uppermost adjacent post-boring bar 3 'is coupled. The length of the drill rods 3, 3 'can be, for example, 6 to 7 m.

In eine obere Anschlußmuffe 62 des Anschlußstücks 59 ist ein Anschlußstutzen 63 der Abtriebswelle 60 eingeschraubt. Oberhalb des Anschlußstutzens 63 läuft die Abtriebswelle 60 in einer drehfesten Nabe 64 einer Drehdurchführung 65. Oberhalb der Drehdurchführung 65 ist die Abtriebswelle 60 mit einer nur angedeuteten, an sich bekannten Längsverzahnung versehen, die im Eingriff steht mit einem ebenfalls an sich bekannten Hohlwellengetriebe des Drehantriebs 61. Der Drehantrieb 61 ist in an sich bekannter Weise entlang einer nicht gezeichneten Lafette vorschiebbar und rückziehbar. Beim Vorschieben des Drehantriebs 61 wird dem Nachsetzbohrgestänge 1 außer der Drehung um die Längsachse 2 eine nach unten gerichtete Vorschubkraft erteilt. Beim Zurückziehen des Drehantriebs 61 wird dagegen das Nachsetzbohrgestänge 1 aus dem Bohrloch herausgezogen.A connecting piece 63 of the output shaft 60 is screwed into an upper connecting sleeve 62 of the connecting piece 59. Above the connecting piece 63, the output shaft 60 runs in a non-rotatable hub 64 of a rotary feedthrough 65. Above the rotary feedthrough 65, the output shaft 60 is provided with only indicated, known longitudinal teeth which are in engagement with a hollow shaft gear of the rotary drive 61, which is also known per se The rotary drive 61 can be advanced and retracted in a manner known per se along a mount (not shown). When the rotary drive 61 is advanced, in addition to the rotation about the longitudinal axis 2 the downward drilling rod 1 is given a downward thrust. On the other hand, when the rotary drive 61 is pulled back, the follow-up drill rod 1 is pulled out of the borehole.

In der Abtriebswelle 60 ist eine mittige, konzentrische Kammer 66 ausgebildet. Die Kammer 66 erstreckt sich von dem dem Anschlußstück 59 zugewandten Ende 67 der Abtriebswelle 60 bis in die Nabe 64. An dem Ende 67 ist in der Kammer 66 ein erstes Ende 68 eines Zwischenrohrs 69 durch eine Dichtung 70 abgedichtet gehalten. Das Zwischenrohr 69 erstreckt sich unter Schaffung eines Außenkanals 71 für das Spülmedium durch ein Außenrohr 72 des Anschlußstücks 59 hindurch. Ein zweites, nicht gezeichnetes unteres Ende des Zwischenrohrs 69 ist, wie erwähnt, entsprechend dem unteren Ende des Zwischenrohrs 9 der Nachsetzbohrstangen 3, 3′ ausgebildet.A central, concentric chamber 66 is formed in the output shaft 60. The chamber 66 extends from the end 67 of the output shaft 60 facing the connection piece 59 into the hub 64. At the end 67, a first end 68 of an intermediate tube 69 is kept sealed in the chamber 66 by a seal 70. The intermediate tube 69 extends through the creation of an outer channel 71 for the flushing medium through an outer tube 72 of the connector 59. A second, not shown, lower end of the intermediate tube 69 is, as mentioned, corresponding to the lower end of the intermediate tube 9 of the extension boring bars 3, 3 '.

In die Kammer 66 und durch das Zwischenrohr 69 hindurch erstreckt sich unter Schaffung eines Zwischenkanals 73 für die Rücklaufflüssigkeit ein Innenrohr 74. Das Innenrohr 74 definiert einen Innenkanal 75 für die Druckflüssigkeit und ist in Richtung der Längsachse 2 relativ zu dem Zwischenrohr 69 zwischen der vorerwähnten ersten Endstellung und der vorerwähnten zweiten Endstellung verschiebbar.An inner tube 74 extends into the chamber 66 and through the intermediate tube 69, creating an intermediate channel 73 for the return liquid. The inner tube 74 defines an inner channel 75 for the pressure fluid and is in the direction of the longitudinal axis 2 relative to the intermediate tube 69 between the aforementioned first End position and the aforementioned second end position can be moved.

Ein nicht gezeichnetes, erstes unteres Ende des Innenrohrs 74 ist, wie erwähnt, in der gleichen Weise ausgebildet wie das untere Ende des Innenrohrs 7 der Nachsetzbohrstangen 3, 3′ und wirkt in der gleichen Weise in den beiden Endstellung mit dem zweiten Ende des Zwischenrohrs 69 zusammen.A not shown, first lower end of the inner tube 74 is, as mentioned, formed in the same way as the lower end of the inner tube 7 of the drill rods 3, 3 'and acts in the same way in the two end positions with the second end of the intermediate tube 69 together.

Ein zweites Ende 76 des Innenrohrs 74 ist außen gegenüber eine Wand 77 der Kammer 66 durch Dichtungen 78 und 79 abgedichtet und kann durch ein Betätigungsfluid in die zweite Endstellung geschoben werden.A second end 76 of the inner tube 74 is sealed on the outside from a wall 77 of the chamber 66 by seals 78 and 79 and can be pushed into the second end position by an actuating fluid.

Im Fall der Fig. 4 wird die Druckflüssigkeit als Betätigungsfluid herangezogen. Die Druckflüssigkeit wird der Nabe 64 an einem Druckflüssigkeitanschluß 80, abgedichtet durch Dichtungen 81 und 82, zugeführt.In the case of FIG. 4, the hydraulic fluid is used as the actuating fluid. The hydraulic fluid is supplied to the hub 64 at a hydraulic fluid connection 80, sealed by seals 81 and 82.

Das zweite Ende 76 des Innenrohrs 74 ist durch eine in die Kammer 66 eingesetzte Buchse 83, welche die Dichtungen 78, 79 trägt, gegenüber der Wand 77 abgedichtet und in radialer Richtung geführt. Die Buchse 83 stützt sich unten auf dem ersten Ende 68 des Zwischenrohrs 69 und oben an einer Distanzhülse 84 ab. Durch die Buchse 83 ist innerhalb der Kammer 66 ein Druckflüssigkeitsraum 85 definiert, der über Bohrungen 86 in der Abtriebswelle 60 in Verbindung mit dem Druckflüssigkeitsanschluß 80 steht.The second end 76 of the inner tube 74 is sealed off from the wall 77 by a bushing 83 which is inserted into the chamber 66 and carries the seals 78, 79 and is guided in the radial direction. The socket 83 is supported at the bottom on the first end 68 of the intermediate tube 69 and at the top on a spacer sleeve 84. A pressure fluid space 85 is defined by the socket 83 within the chamber 66 and is connected to the pressure fluid connection 80 via bores 86 in the output shaft 60.

Ein nicht mit der Druckflüssigkeit beaufschlagbarer Rücklaufraum 87 der Kammer 66 ist ständig einerseits mit dem Zwischenkanal 73 und andererseits mit einem Rücklaufanschluß 88 der Nabe 64 verbunden. Der Rücklaufanschluß 88 ist durch Dichtungen 89 und 90 gegenüber der Abtriebswelle 60 abgedichtet und durch Bohrungen 91 in der Abtriebswelle 60 mit dem Rücklaufraum 87 verbunden.A return space 87 of the chamber 66 which cannot be acted upon by the pressure fluid is constantly connected on the one hand to the intermediate channel 73 and on the other hand to a return connection 88 of the hub 64. The return port 88 is sealed off from the output shaft 60 by seals 89 and 90 and is connected to the return chamber 87 by bores 91 in the output shaft 60.

Der Innenkanal 75 erweitert sich zu dem zweiten Ende 76 des Innenrohr 74 hin. Eine ringförmige Stirnkante 92 des zweiten Endes 76 wirkt als Ventilkörper mit einem in Richtung der Längsachse 2 beweglich gelagerten, durch eine Feder 93 in eine Öffnungsrichtung vorgespannten Ventilsitz 94 zusammen. Der Ventilsitz 94 weist auf seiner Oberseite radiale Stege 95 auf, die den Ventilsitz 94 stets in einem Abstand von einer Stirnwand 96 der Kammer 66 halten. So ist die obere Fläche des Ventilsitzes 94 stets mit dem Druckflüssigkeitsanschluß 80 verbunden.The inner channel 75 widens towards the second end 76 of the inner tube 74. An annular end edge 92 of the second end 76 interacts as a valve body with a valve seat 94 which is movably mounted in the direction of the longitudinal axis 2 and is biased by a spring 93 in an opening direction. The valve seat 94 has radial webs 95 on its upper side, which always keep the valve seat 94 at a distance from an end wall 96 of the chamber 66. Thus, the upper surface of the valve seat 94 is always connected to the pressure fluid connection 80.

Wenn nun der Druckflüssigkeitsanschluß 80 mit Druckflüssigkeit beaufschlagt wird, befinden sich alle beweglichen Teile des Nachsetzbohrgestänges 1 in der in Fig. 4 links von der Längsachse 2 dargestellten ersten Endstellung. Die Druckflüssigkeit gerät auf die Oberseite des Ventilkörpers 94 und drückt den Ventilkörper 94 und das Innenrohr 74 gegen die Kraft einer Rückstellfeder 97 nach unten. Entsprechend Fig. 1 legt sich das untere Ende des Innenrohrs 74 sogleich an die obere Stirnwand 33 des Innenrohrs 7 der benachbarten Nachsetzbohrstange 3′ an und drückt auch dieses Innenrohr 7 und alle Innenrohre 7 evtl. vorhandener weiterer Nachsetzbohrstangen 3 nach unten in deren zweite Endstellung. Kurz bevor das Innenrohr 74 seine zweite Endstellung erreicht, fährt der Ventilsitz 94 gegen einen relativ zu der Abtriebswelle 60 axial stationären Anschlag 98 an der Oberseite der Buchse 83. Dadurch wird die ringförmige Stirnkante 92 von dem Ventilsitz 94 abgehoben und der Ventilsitz 94 durch die Feder 93 wieder in seine Ausgangsposition in der Öffnungsrichtung zurückbewegt. Die Druckflüssigkeit kann auf diese Weise in den Innenkanal 75 einströmen. Wegen der Erweiterung des Innenrohrs 74 an seinem oberen Ende übt die Druckflüssigkeit eine abwärtsgerichtete resultierende Haltekraft auf den Strang der Innenrohr 74, 7 aus. Diese Haltekraft hält den Strang der Innenrohre 74, 7 in seiner zweiten Endstellung gegen die Kraft der Rückstellfedern 48, 97.If hydraulic fluid is now acted upon by hydraulic fluid connection 80, all moving parts of the supplementary drill rod 1 are in the first end position shown to the left of the longitudinal axis 2 in FIG. 4. The hydraulic fluid gets onto the top of the valve body 94 and presses the valve body 94 and the inner tube 74 downward against the force of a return spring 97. According to Fig. 1, the lower end of the inner tube 74 immediately puts on the upper end wall 33 of the inner tube 7 of the adjacent post boring bar 3 'and also presses this inner tube 7 and all inner tubes 7 possibly existing additional boring bars 3 down into their second end position. Shortly before the inner tube 74 reaches its second end position, the valve seat 94 moves against a stop 98, which is axially stationary relative to the output shaft 60, on the upper side of the bushing 83. As a result, the annular end edge 92 is lifted off the valve seat 94 and the valve seat 94 by the spring 93 moved back to its starting position in the opening direction. The hydraulic fluid can in this way Inflow inner channel 75. Because of the expansion of the inner tube 74 at its upper end, the pressure fluid exerts a downward resulting holding force on the strand of the inner tube 74, 7. This holding force holds the strand of the inner tubes 74, 7 in its second end position against the force of the return springs 48, 97.

Außerhalb der Kammer 66 sind in der Wand der Abtriebswelle 60 Spülkanäle 99 vorgesehen, die einen Spülanschluß 100 der Nabe 64, durch Dichtungen 101 und 102 abgedichtet, mit dem Außenkanal 71 des Anschlußstücks 59 verbinden.Outside the chamber 66, flushing channels 99 are provided in the wall of the output shaft 60, which connect a flushing connection 100 of the hub 64, sealed by seals 101 and 102, to the outer channel 71 of the connecting piece 59.

Die in der vorerwähnten Weise durch die Druckflüssigkeit gehaltene zweite Endstellung des Strangs der Innenrohre 74, 7 ist durch eine mechanische Verriegelungsvorrichtung 103 gesichert. Ohne die Verriegelungsvorrichtung 103 würde sich bei kurzzeitigem Abschalten der Druckflüssigkeit oder beim Absinken des Drucks der Druckflüssigkeit der Strang der Innenrohre 74, 7 unter der Wirkung der Rückstellfedern 48, 97 sogleich nach oben in Richtung der ersten Endstellung bewegen. Beim Wiederaufbau des Druckflüssigkeitsdrucks würde sich dann der Strang der Innenrohre 74, 7 wieder in Richtung der zweiten Endstellung bewegen. Solche axialen Bewegungen der Innenrohre 74, 7 aufgrund von Druckschwankungen oder -ausfällen sind unerwünscht, weil sie zu unnötigem Verschleiß und zur Unterbrechung der Druckflüssigkeitszufuhr zum Imlochbohrhammer 5 führen. Diese Nachteile verhindert die Verriegelungsvorrichtung 103.The second end position of the string of inner tubes 74, 7 held by the pressure fluid in the aforementioned manner is secured by a mechanical locking device 103. Without the locking device 103, if the pressure fluid was briefly switched off or the pressure of the pressure fluid dropped, the strand of the inner tubes 74, 7 would immediately move upward in the direction of the first end position under the action of the return springs 48, 97. When the hydraulic fluid pressure was rebuilt, the strand of the inner tubes 74, 7 would then move again in the direction of the second end position. Such axial movements of the inner tubes 74, 7 due to pressure fluctuations or failures are undesirable because they lead to unnecessary wear and the supply of hydraulic fluid to the down-the-hole hammer 5. The locking device 103 prevents these disadvantages.

Die Verriegelungsvorrichtung 103 weist eine an dem zweiten Ende 76 des Innenrohrs 74 axial festgelegte, sich durch die Abtriebswelle 60 hindurch erstreckende Stange 104 auf. Die Stange 104 ist durch eine Dichtung 105 gegenüber der Abtriebswelle 60 abgedichtet. Der Ventilsitz 94 ist auf der Stange 104 verschiebbar gelagert.The locking device 103 has an axially fixed at the second end 76 of the inner tube 74 the output shaft 60 extends through rod 104. The rod 104 is sealed off from the output shaft 60 by a seal 105. The valve seat 94 is slidably mounted on the rod 104.

Auf die Stange 104 ist oben eine Buchse 106 mit einer äußeren, als Ringnut ausgebildeten radialen Vertiefung 107 aufgeschraubt. In der zweiten Endstellung des Innenrohrs 74 greifen mehrere, als Kugeln ausgebildete, gegenüber der Abtriebswelle 60 verriegelte Verriegelungselemente 108 in die Vertiefung 107 ein. Die Verriegelungselemente 108 werden durch eine auf der Abtriebswelle 60 verschiebbar gehaltene Verriegelungshülse 109 betätigt. Die Verriegelungshülse 109 ist durch eine Feder 110 in eine die Verriegelungselemente 108 aktivierende Verriegelungsstellung vorgespannt. Die Verriegelungshülse 109 weist innen eine als Ringnut ausgebildete Erweiterung 111 auf, welche die Verriegelungselemente 108 in einer axialen Freigabestellung der Verriegelungshülse 109 aufnimmt.At the top of the rod 104, a bushing 106 is screwed with an outer, radial groove 107 formed as an annular groove. In the second end position of the inner tube 74, a plurality of locking elements 108, designed as balls and locked with respect to the output shaft 60, engage in the recess 107. The locking elements 108 are actuated by a locking sleeve 109 held displaceably on the output shaft 60. The locking sleeve 109 is biased by a spring 110 into a locking position activating the locking elements 108. The locking sleeve 109 has on the inside an extension 111 designed as an annular groove, which receives the locking elements 108 in an axial release position of the locking sleeve 109.

In Fig. 4 ist auf der rechten Seite der Längsachse 2 die Verriegelungshülse 109 in ihrer unteren, verriegelnden Stellung gezeichnet. Die Verriegelung wird erst dann aufgehoben, wenn der Drehantrieb 61 in Fig. 4 nach oben hin zurückgezogen wird. Dann nämlich stößt der Drehantrieb 61 an eine untere Anschlagfläche 112 der Verriegelungshülse 109 und schiebt die Verriegelungshülse 109 nach oben bis zur Aufhebung der Verriegelung. Zu diesem Zeitpunkt ist normalerweise die Druckflüssigkeit an dem Druckflüssigkeitanschluß 80 schon abgeschaltet, so daß sich die Innenrohre 74, 7 unter die Wirkung der Rückstellfedern 48, 97 sogleich in ihre erste Endstellung bewegen können. Die Elemente der Verriegelungsvorrichtung 103 nehmen dann die in Fig. 1 auf der linken Seite eingezeichneten Relativstellungen ein.In Fig. 4, the locking sleeve 109 is drawn in its lower, locking position on the right side of the longitudinal axis 2. The locking is only released when the rotary drive 61 is retracted upwards in FIG. 4. Then, namely, the rotary drive 61 abuts a lower stop surface 112 of the locking sleeve 109 and pushes the locking sleeve 109 upwards until the lock is released. At this point in time the pressure fluid at the pressure fluid connection 80 is normally already switched off, so that the inner tubes 74, 7 can immediately move into their first end position under the action of the return springs 48, 97. The elements of the locking device 103 then take those shown on the left in FIG. 1 Relative positions.

In Fig. 4 weist das untere Ende der Stange 104 einen Kopf 113 auf, der sich nach außen bis in Berührung mit dem Innenrohr 74 erstreckt und dort in axialer Richtung durch einen Sicherungsring 114 festgelegt ist. Der Kopf 113 weist axiale Durchbrechungen 115 für die Druckflüssigkeit auf.4, the lower end of the rod 104 has a head 113 which extends outward into contact with the inner tube 74 and is fixed there in the axial direction by a locking ring 114. The head 113 has axial openings 115 for the pressure fluid.

Fig. 5 zeigt wichtige Einzelteile der Nachsetzbohrstange 3 und der benachbarten Nachsetzbohrstange 3′ in getrennter Darstellung. Jedes Innenrohr 7 ist unterhalb der Durchbrechungen 37 mit einer Schulter 116 versehen, von der an abwärts das Innenrohr 7 einen größeren Durchmesser aufweist. An der Schulter 116 entsteht eine verhältnismäßig kleine Ringfläche, die aber im gekuppelten Zustand der Nachsetzbohrstangen 3, 3′ bei Beaufschlagung mit Druckflüssigkeit eine gewisse resultierende Kraft nach unten hin gegen die Rückstellfeder 48 auf das Innenrohr 7 ausübt. Durch diese Maßnahme kann die mechanische Verriegelungsvorrichtung 103 (Fig. 4) im Betrieb des Nachsetzbohrgestänges 1 entlastet werden.Fig. 5 shows important items of the drill rod 3 and the neighboring drill rod 3 'in a separate representation. Each inner tube 7 is provided below the openings 37 with a shoulder 116, from which the inner tube 7 has a larger diameter downwards. On the shoulder 116 there is a relatively small annular surface, which, however, in the coupled state of the additional boring bars 3, 3 'when subjected to pressure fluid exerts a certain resulting force downward against the return spring 48 on the inner tube 7. As a result of this measure, the mechanical locking device 103 (FIG. 4) can be relieved during operation of the supplementary drill rod 1.

Fig. 6 zeigt eine gegenüber Fig. 4 andere Art der axialen Verschiebung des Innenrohrs 74. Gleiche Teile wie in Fig. 4 sind in Fig. 6 mit gleichen Bezugszahlen versehen.FIG. 6 shows a different type of axial displacement of the inner tube 74 compared to FIG. 4. The same parts as in FIG. 4 are provided with the same reference numbers in FIG. 6.

In Fig. 6 ist das zweite Ende 76 des Innenrohrs 74 als Kolben ausgebildet und in einem Zylinderraum 117 der Kammer 66 durch eine Dichtung 118 abgedichtet geführt. Eine abgesetzte, ringförmige Stirnfläche 119 des zweiten Endes 76 ist ständig mit einem Betätigungsfluidanschluß 120 der Nabe 64 verbunden. In das zweite Ende 76 ist von oben her das Ende der Stange 104 der Verriegelungsvorrichtung 103 eingeschraubt.In FIG. 6, the second end 76 of the inner tube 74 is designed as a piston and is guided in a sealed manner in a cylinder space 117 of the chamber 66 by a seal 118. A stepped, annular end face 119 of the second end 76 is continuously connected to an actuating fluid connection 120 of the hub 64. The end of the rod 104 of the locking device 103 is screwed into the second end 76 from above.

Bei der Ausführungsform nach Fig. 6 läßt sich der Strang aus den Innenrohren 74, 7 durch Steuerung des Betätigungsfluids an dem Betätigungsfluidanschluß 120 unabhängig von der Druckflüssigkeit am Druckflüssigkeitsanschluß 80 axial bewegen.In the embodiment according to FIG. 6, the strand can be moved axially out of the inner tubes 74, 7 by controlling the actuating fluid at the actuating fluid connection 120 independently of the pressure fluid at the pressure fluid connection 80.

Claims (16)

1. An extendable drilling rig (1) between a connecting piece (4) of a hydraulically-actuated in-hole drilling hammer (5) and a connecting piece (59) of a turning gear (61) shiftable along a boom, whereby the extendable drilling rig (1) features at least one extension drilling rod (3, 3′),
whereby each extension drilling rod (3, 3′) features an inner tube (7) enclosing an inner channel (6) for pressure fluid, an intermediate tube (9) which together with the inner tube (7) defines an intermediate channel (8) for recirculated fluid and an outer tube (11) which together with the intermediate tube (9) defines an outer channel (10) for a flushing medium,
and whereby on each axial end of each extension drilling rod (3, 3′) is provided a valve device, which closes the inner channel (6) and the intermediate channel (8) when the extension drilling rod (3, 3′) is uncoupled,
characterised in that with each extension drilling rod (3, 3′) the inner tube (7) is shiftable in an axial direction relative to the intermediate tube (9) between a first end position and a second end position,
in that the inner tube (7) features at each end an impermeable face wall (33, 34) and a valve block (35, 36) of the valve device (35, 36) provided with at least one lateral opening (37, 38),
in that each valve block (35, 36) in the first end position is sealed against the intermediate tube (9) of its own extension drilling rod (3; 3′),
in that in the second end position the one valve block (35) of each extension drilling rod (3, 3′) is sealed against the intermediate tube (9) of its own extension drilling rod (3, 3′) and the other valve block (36) of each extension drilling rod (3, 3′) is sealed against either the intermediate tube (9) of the adjacent extension drilling rod (3) or a reception opening (23) of the connecting piece (4) of the in-hole drilling hammer (5),
and that in the second end position face walls (34, 33) of adjacent extension drilling rods (3, 3′) are adjacent to one another and the lateral openings (38, 37) of the adjacent valve blocks (36, 35) are connected to one another by a first connecting channel (30) in the intermediate tube (9).
2. An extendable drilling rig according to claim 1, characterised in that in the second end position, the at least one opening (38) of the valve block (36) arranged in the reception opening (43) is connected with a feed channel (45) of the connecting piece (4) of the in-hole drilling hammer (5).
3. An extendable drilling rig according to claim 1 or 2, characterised in that in the first end position, each inner tube (7) with an external projection (46) is up against a stopping surface (47) of the intermediate tube (9) of its own extension drilling rod (3, 3′), and that each inner tube (7) is pre-tensioned in the first end position by a return spring (48), which is braced on the one hand against an external supporting surface (49) of the inner tube (7) and on the other hand against an inner support (50) of the intermediate tube (9) featuring axial openings (51) for the recirculated fluid.
4. An extendable drilling rig according to one of claims 1 to 3, characterised in that each intermediate tube (9) features at one end a detachably inserted coupling sleeve (26), on the inner side of which is provided the first connecting channel (30),
in that on the outside of the coupling sleeve (26) is formed a second connecting channel (31), which on the one hand is permanently in connection with the intermediate channel (8) and on the other hand with at least one aperture (32) in the coupling sleeve (26), and that in the first end position the at least one aperture
(32) is sealed by the valve block (35) of its own extension drilling rod (3, 3′) and in the second end position through the valve block (36) of the adjacent extension drilling rod (3′) via a third connecting channel (53) connected with the intermediate channel (8) of the adjacent extension drilling rod (3′).
5. An extendable drilling rig according to claim 4, characterised in that the coupling sleeve (26) features on its outer axial end a sealed (24) reception opening (25) for one end of the intermediate tube (9) of the adjacent extension drilling rod (3′).
6. An extendable drilling rig according to claim 4 or 5, characterised in that the coupling sleeve (26) features on its outer axial end an insertion funnel (54) for the intermediate tube (9) of the adjacent extension drilling rod (3′).
7. An extendable drilling rig according to one of claims 1 to 6, characterised in that a driven shaft (60) of the turning gear (61) rigidly connected with the connecting piece (59) of the turning gear (61) features a central concentric chamber (66),
in that the chamber (66) extends from the end of the driven shaft (60) facing towards the connecting piece (59) to a sealed hub (64) of a static block (65) for the pressure fluid, recirculated fluid and the flushing medium, encircling the driven shaft (60),
in that in the end of the chamber (66) facing towards the connecting piece (59) is retained in a sealed manner a first end (68) of an intermediate tube (69),
whereby the intermediate tube (69) extends through an outer tube (12) of the connecting piece (59), creating an external channel (71) for the flushing medium, and a second end of the intermediate tube (69) which can be moved into sealed (24) connection with the intermediate tube (9) of the adjacent extension drilling rod (3′), in that an inner tube (74) extends into the chamber (66) and through the intermediate tube (69) of the connecting piece (59), creating an intermediate channel (73) for the recirculated fluid,
in that the inner tube (74) defines an inner channel (75) for the pressure fluid and which is movable in the axial direction relative to the intermediate tube (69) between the first and the second end position,
in that a first end of the inner tube (74) features an impermeable face wall and valve block provided with at least one lateral opening, whereby the valve block aligns axially with the opposing valve block (35) of the adjacent extension drilling rod (3′) as well as interacting in the first end position in a sealing manner with the second end of the intermediate tube and in the second end position with the opposing valve block (35), in order to connect the inner channel (75) with the inner channel (6) of the adjacent extension drilling rod (3′),
and in that a second end (76) of the inner tube (74) is externally sealed against a wall (77) of the chamber (66) and is movable by means of an actuating fluid into the second end position.
8. An extendable drilling rig according to claim 7, characterised in that the second end (76) of the inner tube (74) is sealed vis-à-vis the wall (77) of the chamber (66) and guided in the radial direction by a bush (83) inserted in the chamber (66), and that through the bush (83) a pressure fluid chamber (85) is defined within the chamber (66).
9. An extendable drilling rig according to one of claims 7 or 8, characterised in that a recirculating chamber (87) of the chamber (66) inaccessible to the pressure fluid is permanently connected on the one hand with the intermediate channel (73) of the connecting piece (59) and on the other hand with a recirculation connection (88) of the hub (64).
10. An extendable drilling rig according to one of claims 7 to 9, characterised in that the inner channel (75) widens in the direction of the second end (76) of the inner tube (74),
that an annular face rim (92) of the second end (76) of the inner tube (74) acts as a valve device together with a valve seat (94) which is movably mounted in the axial direction and pre-tensioned in an opening direction by a spring (93),
that an external surface (see 95) of the valve seat (94) is permanently connected with a pressure fluid connection (80) of the hub (64) supplying the actuating fluid,
and that on introduction of the pressure fluid into the pressure fluid connection (80), shortly before the inner tube (74) reaches its second end position, the valve seat (94) moves against a stop (98) which is axially stationary relative to the driven shaft (60), whereupon the valve body (see 92) rises from the valve seat (94), the valve seat (94) is moved back by the spring (93) to its starting position in the opening direction and the pressure fluid enters the inner channel (75).
11. An extendable drilling rig according to one of claims 7 to 9, characterised in that the second end (76) of the inner tube (74) is guided in a sealed manner (118) as piston in a cylindrical chamber (117) of the chamber (66), and that a face surface (119) of the second end (76) is permanently connected with an actuating fluid connection (120) of the hub (64).
12. An extendable drilling rig according to one of claims 7 to 11, characterised in that outside the chamber (66) in the wall of the driven shaft (60) is provided at least one flushing channel (99), which connects a flushing connection (100) of the hub (64) with the external channel (71) of the connecting piece (59).
13. An extendable drilling rig according to one of claims 7 to 12, characterised in that the second end position of the inner tube (74) is secured by an interlocking device (103).
14. An extendable drilling rig according to claim 13, characterised in that the interlocking device (103) features a rod (104) which is axially fixed on the second end (76) of the inner tube (74) and which extends through the driven shaft (60),
that the rod (104) is provided with at least one radial recess (107), and that in the second end position of the inner tube (74) an interlocking element (108) interlocked vis-à-vis the driven shaft (60) engages in the recess (107).
15. An extendable drilling rig according to claim 14, characterised in that the at least one interlocking element (108) can be actuated by an interlocking sleeve (109) movably mounted on the driven shaft (60), that the interlocking sleeve (109) is pre-tensioned by a spring (110) in an interlocking position activating the at least one interlocking element (108), and that the interlocking sleeve (109) features internally at least one widened section (111) for accommodating the at least one interlocking element (108) in an axial release position of the interlocking sleeve (109).
16. An extendable drilling rig according to claim 15, characterised in that on withdrawal of the turning gear (61) on its boom, through the turning gear (61) the interlocking sleeve (109) is automatically movable from its interlocking position into its release position.
EP89103122A 1988-03-05 1989-02-23 Drill pipe for a hydraulic down-hole drill hammer Expired - Lifetime EP0331978B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3807321A DE3807321C1 (en) 1988-03-05 1988-03-05
DE3807321 1988-03-05

Publications (3)

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EP0331978A2 EP0331978A2 (en) 1989-09-13
EP0331978A3 EP0331978A3 (en) 1990-04-11
EP0331978B1 true EP0331978B1 (en) 1991-11-13

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EP89103122A Expired - Lifetime EP0331978B1 (en) 1988-03-05 1989-02-23 Drill pipe for a hydraulic down-hole drill hammer

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EP (1) EP0331978B1 (en)
JP (1) JPH0216288A (en)
DE (2) DE3807321C1 (en)
FI (1) FI891027A (en)

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Publication number Priority date Publication date Assignee Title
DE4027414C1 (en) * 1990-08-30 1992-02-13 Komotzki, Michael, 4708 Kamen, De Tubular rock bore drill stem - has concentric channels for fluids and has spring-loaded control valves
FI103688B (en) * 1994-09-16 1999-08-13 Atlas Copco Secoroc Ab The drill rod
US5586609A (en) * 1994-12-15 1996-12-24 Telejet Technologies, Inc. Method and apparatus for drilling with high-pressure, reduced solid content liquid
AT407184B (en) * 1996-05-20 2001-01-25 Boehler Pneumatik Internat Gmb HYDRAULIC DEEP HOLE DRILL
SE534395C2 (en) * 2009-12-18 2011-08-09 Wassara Ab Device for jointing of double wall drill pipes and double wall drill pipes
GB2481848A (en) * 2010-07-09 2012-01-11 Mine Innovation Ltd Self sealing drill rods
WO2014019154A1 (en) * 2012-08-01 2014-02-06 思达斯易能源技术(集团)有限公司 Well flushing valve
CN113006680B (en) * 2021-03-19 2022-10-28 成都欧维恩博石油科技有限公司 Low-pressure-loss torsion impact drilling tool and rock breaking method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022865B1 (en) * 1978-12-15 1984-08-01 Furukawakogyo Co.Ltd Hydraulically-driven downhole drill
DE3015695A1 (en) * 1980-04-24 1981-10-29 Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter DRILL RODS FOR A COUNTERBURNING TOOL
DE3309031C2 (en) * 1983-03-14 1986-07-31 Turkmenskij naučno-issledovatel'skij geologorasvedočnyj institut, Ašchabad Drilling rig for earth drilling and testing of groundwater horizons

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FI891027A0 (en) 1989-03-03
EP0331978A3 (en) 1990-04-11
EP0331978A2 (en) 1989-09-13
DE58900441D1 (en) 1991-12-19
JPH0216288A (en) 1990-01-19
FI891027A (en) 1989-09-06
DE3807321C1 (en) 1989-05-11

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