EP1407115A1 - Connecting an anchoring rod to a drilling tool - Google Patents

Connecting an anchoring rod to a drilling tool

Info

Publication number
EP1407115A1
EP1407115A1 EP01274371A EP01274371A EP1407115A1 EP 1407115 A1 EP1407115 A1 EP 1407115A1 EP 01274371 A EP01274371 A EP 01274371A EP 01274371 A EP01274371 A EP 01274371A EP 1407115 A1 EP1407115 A1 EP 1407115A1
Authority
EP
European Patent Office
Prior art keywords
anchor rod
section
anchor
transition sleeve
anchoring rod
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.)
Granted
Application number
EP01274371A
Other languages
German (de)
French (fr)
Other versions
EP1407115B1 (en
Inventor
Hannes Papousek
Herbert Papousek
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.)
Atlas Copco Mai GmbH
Original Assignee
Atlas Copco Mai GmbH
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 Atlas Copco Mai GmbH filed Critical Atlas Copco Mai GmbH
Publication of EP1407115A1 publication Critical patent/EP1407115A1/en
Application granted granted Critical
Publication of EP1407115B1 publication Critical patent/EP1407115B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • E21B17/042—Threaded
    • E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0053—Anchoring-bolts in the form of lost drilling rods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y10T403/5733—Plural opposed sockets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y10T403/5741—Separate screw or pin-type connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y10T403/5746—Continuous thread
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y10T403/5761—Interrupted periphery, e.g., split or segmental, etc.
    • Y10T403/5786—Split

Definitions

  • the invention relates to a connection between an anchor rod and the drilling device of a device for setting self-drilling injection anchors.
  • the anchor rods that make up the anchor system are connected to the drill head of a drilling rig. This connection is made via a transition sleeve into which one end of the anchor rod is screwed and which is coupled to the insertion end of the drilling device, for example by screwing on. A drill bit is screwed onto the front end of the first anchor rod. As the depth of the borehole progresses, the anchor rod is extended by screwing on connecting couplings and additional anchor rods until the total anchor length is reached.
  • the release of the anchor rod from the transition sleeve on the drilling device has proven to be problematic in the prior art.
  • the anchor rod becomes jammed in the transition sleeve that connects it to the drilling device, which leads to malfunctions, since a lot of force and time is required to loosen the screw connection between the anchor rod and the transition sleeve is.
  • the reason for the frequently occurring jamming is that the non-heat-treated anchor rods have a lower hardness than boring rods that are always used in tempered quality.
  • the transition sleeve which is also always remunerated the drill, as it is designed for multiple use, much harder than the anchor rods.
  • anchor rods From US 4,332,502 A it is known for anchor rods to be connected to one another by connecting couplings to form thread-free sections at their ends.
  • the anchor rods are connected to one another by connecting couplings which, in the area in which the anchor rods screwed into the connecting coupling abut one another with their unthreaded sections, have an inwardly projecting ring in which the unthreaded ends of the screws screwed into the transition sleeve Engage anchor rods.
  • the invention is based on the object of designing the end of anchor rods received in the transition sleeve on the drill so that the described jamming does not occur.
  • At least one end is the anchor rod according to the invention provided with a tapered section.
  • This section which is provided on the anchor rod at least at its end received in the transition sleeve of the drilling device (screwed into it), can have a cylindrical outer surface and in turn have a chamfer on the end face.
  • the inventive design of at least one end of the anchor rods results in a trouble-free loosening (unscrewing) of anchor rods from the transition sleeve, because when drilling anchors under the effect of the loads occurring during drilling, deformations of the end of an anchor rod received in the transition sleeve occur due to the free space between the inner surface of the transition sleeve and the smaller-diameter section of the end of the anchor rod cannot lead to the anchor rods being clamped in the transition sleeve.
  • the screwing of the connection couplings onto the end of the last anchor rod protruding from the borehole is also problem-free, because there is play between the tapered end of the anchor rod and the inner surface of the connection coupling even when the end of the anchor rod has been deformed ,
  • the advantage for the user of the connection according to the invention between the anchor rod and the drilling device is first of all that longer work interruptions are avoided, since the anchor rod can be easily detached from the transition sleeve, so that trouble-free operation is ensured.
  • the solution to the problem according to the invention (avoiding jamming between the transition sleeve and anchor rod) is of considerable importance since the removal of a fault at a greater height is not a problem represents an insignificant security risk.
  • FIG. 1 schematically shows a hammer drill during drilling
  • FIG. 2 shows one end of a known anchor rod
  • FIG. 3 shows the end of an anchor rod with a tapered end
  • FIG. 4 shows in section an end of an anchor rod screwed into a transition sleeve.
  • the drill hammer shown in FIG. 1 consists of a drilling device 1 which is advanced on a guide of the drilling mount 3 supported on the rock 2 in accordance with the drilling progress.
  • the drive provided for this is not shown.
  • an anchor rod 6 is screwed in via a transition sleeve 5, to which an anchor rod carrying a drill bit directly or, depending on the drilling progress, further anchor rods 6 are connected via connecting couplings 7.
  • a flushing liquid can be introduced into the anchor rods 6 and, after completion of the bore for fixing the anchor, a (hydraulically) setting medium which, after hardening, fixes the anchor, which consists of the corresponding number of anchor rods ⁇ , in the borehole ,
  • FIG. 2 shows one end of a known anchor rod 6, which has an external thread 9 due to the corresponding shaping of its wall.
  • the end of the known anchor rod is provided with a 45 ° chamfer 11.
  • At least one end is designed as shown in FIG. 3 and has a section 12 which has a diameter Ra which is reduced compared to the outer diameter (Rd) of the anchor rod 6 and which does not have an external thread 9.
  • the free end of section 12 of anchor rod 6 with reduced diameter Ra can also be provided with a 45 ° chamfer 11.
  • a corresponding configuration is possible for at least the end of the boring bar 8 screwed into the transition sleeve 5, but not mandatory, in particular if the boring bar 8 consists of hardened steel (like the transition sleeve 5).
  • section 12 with a reduced diameter is arbitrary in itself, but will often be cylindrical in shape.
  • section 15 can also be designed to taper conically towards the free end, the outer contour being inclined by no more than 20 degrees to the longitudinal axis of the anchor rod 6.
  • the clear cross section of the ring rib 20 is essentially the same size as the clear cross section of the anchor rods 8.
  • This free space 23 allows the tapered section 12 provided at the end of the anchor rod 6 to be plastically deformed without the anchor rod 6
  • the end face 24 of the anchor rod 6 bears against the lateral annular surface 25 of the annular rib 20.
  • the end 4 of the insertion end 4 of the drilling device 1 lies against the other annular surface 27 of the annular rib 20.
  • An anchor rod 6 for rock anchors (self-drilling injection anchor) has an external thread 9 for connecting the anchor rod 6 to a drill 1 via a transition sleeve 5.
  • the end of the anchor rod 6 screwed into the transition sleeve 5 has a section 12 with a smaller diameter than the outside diameter of the anchor rod 6 Diameter on.
  • the section 12 of the anchor rod 6 with a tapered diameter has a chamfer 11 at its free end. As a result, lies between the inner surface 22 of the transition sleeve 5 and the end of the anchor rod

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Earth Drilling (AREA)
  • Piles And Underground Anchors (AREA)
  • Dowels (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

The invention relates to an anchoring rod (6) for rock anchoring (self-drilling injection bolts), comprising an outer thread (9) for connecting the anchoring rod (6) to a drilling tool (1) via a coupling sleeve (5). The end of the anchoring rod (6), which is screwed into the coupling sleeve (5), comprises a section (12) which has a reduced diameter in comparison with the outer diameter of the anchoring rod (6). The free end of the section (12) of the anchoring rod (6) with the reduced diameter comprises a bevel (11). An open space (23) is thus formed between the inner surface of the coupling sleeve (5) and the reduced diameter end of the anchoring rod (6). Said space stops the anchoring rod (6) from becoming stuck in the coupling sleeve, even when the end of the rod is plastically deformed during the drilling process, so that the anchoring rod (6) can be unscrewed from the coupling sleeve (5) without applying significant force.

Description

Verbindung einer Ankerstange mit einem BohrgerätConnection of an anchor rod to a drill
Die Erfindung betrifft eine Verbindung einer Ankerstange mit dem Bohrgerät einer Vorrichtung zum Setzen von Selbstbohrin- jektionsankern.The invention relates to a connection between an anchor rod and the drilling device of a device for setting self-drilling injection anchors.
Um Selbstbohrinjektionsanker im Gebirge installieren zu kön- nen, ist es notwendig, dass die Ankerstangen, aus denen das Ankersystem besteht, mit dem Bohrkopf eines Bohrgerätes verbunden werden. Diese Verbindung erfolgt über eine Übergangsmuffe, in die ein Ende der Ankerstange eingeschraubt wird und die mit dem Einsteckende des Bohrgerätes, beispielsweise durch Aufschrauben, gekuppelt ist. Am vordersten Ende der ersten Ankerstange ist eine Bohrkrone aufgeschraubt. Bei fortschreitender Tiefe des Bohrloches wird die Ankerstange durch Aufschrauben von Verbindungskupplungen und weiteren Ankerstangen bis zum Erreichen der Gesamtankerlänge verlängert. Beim Ein- setzen einer Ankerstange ist es erforderlich, die Verbindung zwischen der im Gebirge verbohrten letzten Ankerstange und dem Bohrgerät zu lösen, indem die letzte, aus dem Bohrloch herausragende Ankerstange an der Übergangsmuffe herausgeschraubt und eine neue Ankerstange eingesetzt wird, wobei diese mit der letzten Ankerstange durch eine Verbindungskupplung verlängert und in die Übergangsmuffe des Bohrgerätes eingeschraubt werden muss .In order to be able to install self-drilling injection anchors in the mountains, it is necessary that the anchor rods that make up the anchor system are connected to the drill head of a drilling rig. This connection is made via a transition sleeve into which one end of the anchor rod is screwed and which is coupled to the insertion end of the drilling device, for example by screwing on. A drill bit is screwed onto the front end of the first anchor rod. As the depth of the borehole progresses, the anchor rod is extended by screwing on connecting couplings and additional anchor rods until the total anchor length is reached. When inserting an anchor rod, it is necessary to loosen the connection between the last anchor rod drilled in the mountains and the drill by unscrewing the last anchor rod protruding from the borehole on the transition sleeve and inserting a new anchor rod, with the last one The anchor rod must be extended by a connecting coupling and screwed into the transition sleeve of the drill.
Das Lösen zunächst der Ankerstange von der Übergangsmuffe am Bohrgerät hat sich im Stand der Technik als problematisch herausgestellt. Bei der bekannten Ausbildung der Enden der Ankerstangen kommt es oft dazu, dass sich die Ankerstange in der Übergangsmuffe, die diese mit dem Bohrgerät verbindet, verklemmt, was zu Arbeitsstörungen führt, da für das Lösen der Schraubverbindung zwischen Ankerstange und Übergangsmuffe viel Kraft und Zeit erforderlich ist. Grund für das häufig auftretende Verklemmen ist es, dass die nicht wärmebehandelten Ankerstangen im Vergleich zu Bohrstangen, die immer in vergüteter Qualität eingesetzt werden, eine niedrigere Härte auf- weisen. Auch ist die ebenfalls immer vergütete Übergangsmuffe des Bohrgerätes, da sie für mehrfachen Gebrauch ausgelegt ist, wesentlich härter als die Ankerstangen. Bei Betrieb, also beim Bohren, kommt es durch den Prozess der schlagdrehenden Bohrung (Drehbewegung und schlagende Bewegung) zu einer bleibenden Verformung des in der Übergangsmuffe aufgenommenen Endes der Ankerstange, wodurch sich das vorstehend erwähnte Problem des Verklemmens von Ankerstangen in der Übergangsmuffe ergibt.The release of the anchor rod from the transition sleeve on the drilling device has proven to be problematic in the prior art. In the known design of the ends of the anchor rods, it often happens that the anchor rod becomes jammed in the transition sleeve that connects it to the drilling device, which leads to malfunctions, since a lot of force and time is required to loosen the screw connection between the anchor rod and the transition sleeve is. The reason for the frequently occurring jamming is that the non-heat-treated anchor rods have a lower hardness than boring rods that are always used in tempered quality. Also the transition sleeve, which is also always remunerated the drill, as it is designed for multiple use, much harder than the anchor rods. During operation, i.e. during drilling, the process of the impact-drilling (rotational movement and impact movement) leads to a permanent deformation of the end of the anchor rod accommodated in the transition sleeve, which results in the above-mentioned problem of jamming anchor rods in the transition sleeve.
Aus der US 4,332,502 A ist es für durch Verbindungskupplungen miteinander zu verbindende Ankerstangen bekannt, an deren Enden gewindefreie Abschnitte auszubilden. Die Ankerstangen werden bei der US 4,332,502 A durch Verbindungskupplungen miteinander verbunden, die in dem Bereich, in dem die in die Verbindungskupplung eingeschraubten Ankerstangen mit ihren gewindefreien Abschnitten aneinander anliegen, einen nach innen vorspringenden Ring aufweisen, in den die gewindefreien Enden der in die Übergangsmuffe eingeschraubten Ankerstangen eingreifen. Dies bedeutet, dass im Falle von schlagartigen Belastungen auf die Ankerstangen, wie sie beim Setzen von Gebirgsankern auftreten, wenn mit diesen Bohrlöcher erzeugt werden, Verformungen, vor allem und in erster Linie im Bereich der aneinander anliegenden Enden, also im Bereich der gewindefreien Abschnitte der Ankerstangen, auftreten werden, sodass die gewindefreien Abschnitte der Ankerstangen unter Vergröße- rung ihres Durchmessers gestaucht werden. Diese Verformungen werden bewirken, dass das oben als nachteilig herausgestellte Verklemmen zwischen den Ankerstangen und der Muffe auftreten wird.From US 4,332,502 A it is known for anchor rods to be connected to one another by connecting couplings to form thread-free sections at their ends. In US 4,332,502 A, the anchor rods are connected to one another by connecting couplings which, in the area in which the anchor rods screwed into the connecting coupling abut one another with their unthreaded sections, have an inwardly projecting ring in which the unthreaded ends of the screws screwed into the transition sleeve Engage anchor rods. This means that in the event of sudden loads on the anchor rods, such as occur when placing rock anchors, if holes are produced with them, deformations, especially and primarily in the area of the abutting ends, i.e. in the area of the unthreaded sections of the Anchor rods will occur, so that the thread-free sections of the anchor rods are compressed by increasing their diameter. These deformations will cause the jamming between the anchor rods and the sleeve, which has been found to be disadvantageous above, to occur.
Der Erfindung liegt die Aufgabe zu Grunde, das in der Übergangsmuffe am Bohrgerät aufgenommene Ende von Ankerstangen so auszubilden, dass das beschriebene Verklemmen nicht auftritt.The invention is based on the object of designing the end of anchor rods received in the transition sleeve on the drill so that the described jamming does not occur.
Gelöst wird diese Aufgabe mit den Merkmalen des Anspruches 1.This object is achieved with the features of claim 1.
Bevorzugte und vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche.Preferred and advantageous embodiments are the subject of the dependent claims.
Im Gegensatz zu den bekannten Ankerstangen, bei denen die Enden (leicht) angefast sind, ist wenigstens ein Ende der erfindungsgemäßen Ankerstange mit einem durchmesserverjüngten Abschnitt versehen. Dieser Abschnitt, der an der Ankerstange wenigstens an ihrem in der Übergangsmuffe des Bohrgerätes aufgenommenen (in diese eingeschraubten) Ende vorgesehen ist, kann eine zylindrische Aussenfläche aufweisen und seinerseits an der Stirnfläche eine Fase aufweisen.In contrast to the known anchor rods, in which the ends are (slightly) chamfered, at least one end is the anchor rod according to the invention provided with a tapered section. This section, which is provided on the anchor rod at least at its end received in the transition sleeve of the drilling device (screwed into it), can have a cylindrical outer surface and in turn have a chamfer on the end face.
Durch die erfindungsgemäße Ausbildung von wenigstens einem Ende der Ankerstangen ergibt sich ein störungsfreies Lösen (Herausschrauben) von Ankerstangen von der Übergangsmuffe, weil beim Setzen von Bohrankern unter der Wirkung der beim Bohren auftretenden Belastungen auftretende Verformungen des in der Übergangsmuffe aufgenommenen Endes einer Ankerstange wegen des Freiraumes zwischen der Innenfläche der Übergangs- muffe und dem mit kleinerem Durchmesser ausgebildeten Abschnitt des Endes der Ankerstange nicht zum Klemmen der Ankerstangen in der Übergangsmuffe führen kann.The inventive design of at least one end of the anchor rods results in a trouble-free loosening (unscrewing) of anchor rods from the transition sleeve, because when drilling anchors under the effect of the loads occurring during drilling, deformations of the end of an anchor rod received in the transition sleeve occur due to the free space between the inner surface of the transition sleeve and the smaller-diameter section of the end of the anchor rod cannot lead to the anchor rods being clamped in the transition sleeve.
Bei der Erfindung ist auch das Aufschrauben der Verbindungs- kupplungen auf das aus dem Bohrloch herausstehende Ende der letzten Ankerstange problemlos, weil zwischen dem verjüngten Ende der Ankerstange und der Innenfläche der Verbindungskupp- lung auch dann Spiel vorliegt, wenn das Ende der Ankerstange verformt worden ist.In the invention, the screwing of the connection couplings onto the end of the last anchor rod protruding from the borehole is also problem-free, because there is play between the tapered end of the anchor rod and the inner surface of the connection coupling even when the end of the anchor rod has been deformed ,
Der Vorteil für den Anwender der erfindungsgemäßen Verbindung zwischen Ankerstange und Bohrgerät besteht zunächst darin, dass längere Arbeitsunterbrechungen vermieden sind, da sich die Ankerstange von der Übergangsmuffe leicht lösen läßt, so dass ein störungsfreier Betrieb gewährleistet ist. Unter Berücksichtigung der Tatsache, dass bei Tunnelbauten oder bei einer Hangsicherung die Bohrhämmer häufig in relativ großem Bodenabstand arbeiten, ist die Lösung der erfindungsgemäßen Aufgabe (Vermeiden eines Verklemmens zwischen Übergangsmuffe und Ankerstange) von erheblicher Bedeutung, da das Beheben einer Störung in größerer Höhe ein nicht unbeträchtliches Sicherheitsrisiko darstellt.The advantage for the user of the connection according to the invention between the anchor rod and the drilling device is first of all that longer work interruptions are avoided, since the anchor rod can be easily detached from the transition sleeve, so that trouble-free operation is ensured. Taking into account the fact that the drilling hammers often work at a relatively large distance from the ground in tunnel constructions or slope stabilization, the solution to the problem according to the invention (avoiding jamming between the transition sleeve and anchor rod) is of considerable importance since the removal of a fault at a greater height is not a problem represents an insignificant security risk.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Beschreibung. Es zeigt: Fig. 1 schematisch einen Bohrhammer beim Bohren, Fig. 2 ein Ende einer bekannten, Ankerstange, Fig. 3 das Ende einer Ankerstange mit durchmesserverjüngtem Ende und Fig. 4 im Schnitt ein Ende einer in eine Übergangsmuffe eingeschraubten Anker- stange.Further details, features and advantages of the invention will become apparent from the description below. It shows: 1 schematically shows a hammer drill during drilling, FIG. 2 shows one end of a known anchor rod, FIG. 3 shows the end of an anchor rod with a tapered end, and FIG. 4 shows in section an end of an anchor rod screwed into a transition sleeve.
Der in Fig. 1 gezeigte Bohrhammer besteht aus einem Bohrgerät 1, das auf einer am Gebirge 2 abgestützten Führung der Bohrlafette 3 entsprechend dem Bohrfortschritt vorgeschoben wird. Der hiefür vorgesehene Antrieb ist nicht dargestellt. An dem Einsteckende 4 des Bohrgerätes 1 ist über eine Übergangsmuffe 5 eine Ankerstange 6 eingeschraubt, mit der über Verbindungskupplungen 7 entweder unmittelbar eine Bohrkrone tragende Ankerstange oder, je nach Bohrfortschritt, weitere Ankerstan- gen 6 verbunden sind.The drill hammer shown in FIG. 1 consists of a drilling device 1 which is advanced on a guide of the drilling mount 3 supported on the rock 2 in accordance with the drilling progress. The drive provided for this is not shown. At the insertion end 4 of the drilling device 1, an anchor rod 6 is screwed in via a transition sleeve 5, to which an anchor rod carrying a drill bit directly or, depending on the drilling progress, further anchor rods 6 are connected via connecting couplings 7.
Über einen Anschlussteil 10 kann in die Ankerstangen 6 eine Spülflüssigkeit und nach beendeter Bohrung zum Fixieren des Ankers ein (hydraulisch) abbindendes Medium eingebracht wer- den, das nach dem Erhärten den Anker, der aus der entsprechenden Anzahl von Ankerstangen β besteht, im Bohrloch fixiert.Via a connecting part 10, a flushing liquid can be introduced into the anchor rods 6 and, after completion of the bore for fixing the anchor, a (hydraulically) setting medium which, after hardening, fixes the anchor, which consists of the corresponding number of anchor rods β, in the borehole ,
Fig. 2 zeigt ein Ende einer bekannten Ankerstange 6, die durch entsprechende Formgebung ihrer Wand ein Aussengewinde 9 auf- weist. Das Ende der bekannten Ankerstange ist mit einer 45° Fase 11 versehen.2 shows one end of a known anchor rod 6, which has an external thread 9 due to the corresponding shaping of its wall. The end of the known anchor rod is provided with a 45 ° chamfer 11.
Bei der erfindungsgemäßen Ankerstange 6 ist wenigstens ein Ende so wie in Fig. 3 dargestellt ausgebildet, und weist einen Abschnitt 12 auf, der einen gegenüber dem Aussendurchmesser (Rd) der Ankerstange 6 verringerten Durchmesser Ra hat und kein Aussengewinde 9 trägt. Das freie Ende des Abschnittes 12 der Ankerstange 6 mit vermindertem Durchmesser Ra kann ebenfalls mit einer 45° Fase 11 versehen sein. Eine sinngemäße Ausgestaltung ist für wenigstens das in die Übergangsmuffe 5 eingeschraubte Ende der Bohrstange 8 möglich, aber nicht zwingend, insbesondere wenn die Bohrstange 8 aus gehärtetem Stahl (wie die Übergangsmuffe 5) besteht.In the anchor rod 6 according to the invention, at least one end is designed as shown in FIG. 3 and has a section 12 which has a diameter Ra which is reduced compared to the outer diameter (Rd) of the anchor rod 6 and which does not have an external thread 9. The free end of section 12 of anchor rod 6 with reduced diameter Ra can also be provided with a 45 ° chamfer 11. A corresponding configuration is possible for at least the end of the boring bar 8 screwed into the transition sleeve 5, but not mandatory, in particular if the boring bar 8 consists of hardened steel (like the transition sleeve 5).
Die Aussenform des Abschnittes 12 mit verringertem Durchmesser ist an sich beliebig, wird häufig aber zylindermantelförmig ausgebildet sein. Der Abschnitt 15 kann auch sich zum freien Ende hin konisch verjüngend ausgebildet sein, wobei die Aus- senkontur um nicht mehr als 20 Grad zur Längsachse der Anker- stange 6 geneigt ist.The outer shape of section 12 with a reduced diameter is arbitrary in itself, but will often be cylindrical in shape. The section 15 can also be designed to taper conically towards the free end, the outer contour being inclined by no more than 20 degrees to the longitudinal axis of the anchor rod 6.
Die Übergangsmuffe 5, die auf das Einsteckende 4 der Abtriebsoder Ausgangswelle 4 des Bohrgerätes 1 geschraubt ist, besteht vorzugsweise aus gehärtetem Stahl und weist in ihrer Mitte eine nach innen vorspringende Ringrippe 20 auf. Der lichte Querschnitt der Ringrippe 20 ist im wesentlichen gleich groß wie der lichte Querschnitt der Ankerstangen 8.The transition sleeve 5, which is screwed onto the insertion end 4 of the output or output shaft 4 of the drilling device 1, preferably consists of hardened steel and has an inwardly projecting ring rib 20. The clear cross section of the ring rib 20 is essentially the same size as the clear cross section of the anchor rods 8.
Zwischen der Aussenfläche 21 des verjüngten Abschnittes 12 einer Ankerstange 6 und der Innenfläche 22 der ÜbergangsmuffeBetween the outer surface 21 of the tapered section 12 of an anchor rod 6 and the inner surface 22 of the transition sleeve
5 liegt ein Freiraum 23 vor. Dieser Freiraum 23 erlaubt ein plastisches Verformen des am Ende der Ankerstange 6 vorgesehenen, verjüngten Abschnittes 12, ohne dass die Ankerstange 65 there is a free space 23. This free space 23 allows the tapered section 12 provided at the end of the anchor rod 6 to be plastically deformed without the anchor rod 6
(oder die Bohrstange 8) in der Übergangsmuffe 5 klemmt.(or the boring bar 8) jams in the transition sleeve 5.
Die Ankerstange 6 liegt mit ihrer Stirnfläche 24 an der seitlichen Ringfläche 25 der Ringrippe 20 an. Das Einsteckende 4 des Bohrgerätes 1 liegt mit seiner Endfläche 26 an der anderen Ringfläche 27 der Ringrippe 20 an.The end face 24 of the anchor rod 6 bears against the lateral annular surface 25 of the annular rib 20. The end 4 of the insertion end 4 of the drilling device 1 lies against the other annular surface 27 of the annular rib 20.
Zusammenfassend kann ein Ausführungsbeispiel der Erfindung wie folgt dargestellt werden:In summary, an embodiment of the invention can be represented as follows:
Eine Ankerstange 6 für Gebirgsanker (Selbstbohrinjektions- anker) besitzt ein Aussengewinde 9 zum Verbinden der Ankerstange 6 mit einem Bohrgerät 1 über eine Übergangsmuffe 5. Das in die Übergangsmuffe 5 eingeschraubte Ende der Ankerstange 6 weist einen Abschnitt 12 mit gegenüber dem Aussendurchmesser der Ankerstange 6 kleinerem Durchmesser auf. Der Abschnitt 12 der Ankerstange 6 mit verjüngtem Durchmesser weist an seinem freien Ende eine Fase 11 auf. Dadurch liegt zwischen der Innenfläche 22 der Übergangsmuffe 5 und dem Ende der AnkerstangeAn anchor rod 6 for rock anchors (self-drilling injection anchor) has an external thread 9 for connecting the anchor rod 6 to a drill 1 via a transition sleeve 5. The end of the anchor rod 6 screwed into the transition sleeve 5 has a section 12 with a smaller diameter than the outside diameter of the anchor rod 6 Diameter on. The section 12 of the anchor rod 6 with a tapered diameter has a chamfer 11 at its free end. As a result, lies between the inner surface 22 of the transition sleeve 5 and the end of the anchor rod
6 mit verjüngtem Durchmesser ein Freiraum 23 vor, der verhindert, dass die Ankerstange 6, auch wenn ihr Ende während der Bohrarbeit plastisch verformt wird, in der Übergangsmuffe 5 klemmt, so dass die Ankerstange 6 ohne erhöhten Kraftaufwand aus der Übergangsmuffe 5 herausgeschraubt werden kann. 6 with a tapered diameter, a free space 23 that prevents the anchor rod 6, even if its end is plastically deformed during the drilling work, in the transition sleeve 5 clamps so that the anchor rod 6 can be screwed out of the transition sleeve 5 without increased force.

Claims

Patentansprüche : Claims:
1. Verbindung einer Ankerstange (6) mit einem Bohrgerät (1) unter Verwendung einer mit dem Einsteckende (4) des Bohr- gerätes (1) verbundenen Übergangsmuffe (5) , in die ein Ende der Ankerstange (6) eingeschraubt ist, dadurch gekennzeichnet, dass wenigstens das in die Übergangsmuffe (5) eingeschraubte Ende der Ankerstange (6) einen Abschnitt (12) mit gegenüber dem Aussendurchmesser (Rd) der Ankerstange (6) verjüngtem Durchmesser (Ra) aufweist, derart, dass zwischen der Innenfläche (23) der Übergangsmuffe (5) und dem Abschnitt (12) der Ankerstange (6) ein Freiraum (23) vorliegt.1. Connection of an anchor rod (6) to a drill (1) using a connecting sleeve (5) connected to the insertion end (4) of the drill (1), into which one end of the anchor rod (6) is screwed, characterized that at least the end of the anchor rod (6) screwed into the transition sleeve (5) has a section (12) with a diameter (Ra) that is tapered compared to the outer diameter (Rd) of the anchor rod (6), such that between the inner surface (23) the transition sleeve (5) and the section (12) of the anchor rod (6) have a free space (23).
2. Verbindung nach Anspruch 1, dadurch gekennzeichnet, dass der Abschnitt (12) der Ankerstange (6) mit verjüngtem Durchmesser (Ra) gewindefrei ausgebildet ist.2. Connection according to claim 1, characterized in that the section (12) of the anchor rod (6) with a tapered diameter (Ra) is thread-free.
3. Ankerstange nach Anspruch 1 oder 2, dadurch gekennzeich- net, dass der Abschnitt (12) der Ankerstange (6) mit verjüngtem Durchmesser (Ra) an seinem freien Ende eine Fase (11) oder einen Radius aufweist.3. Anchor rod according to claim 1 or 2, characterized in that the section (12) of the anchor rod (6) with a tapered diameter (Ra) has a chamfer (11) or a radius at its free end.
4. Ankerstange nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Aussenkontur des Abschnittes4. Anchor rod according to one of claims 1 to 3, characterized in that the outer contour of the section
(12) mit verjüngtem Durchmesser (Ra) zylindermantelförmig ist.(12) with a tapered diameter (Ra) is cylindrical.
5. AnkerStange nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Aussenkontur des Abschnittes5. Anchor rod according to one of claims 1 to 3, characterized in that the outer contour of the section
(12) mit verjüngtem Durchmesser (Ra) konisch ist.(12) is tapered in diameter (Ra).
6. Ankerstange nach Anspruch 5, dadurch gekennzeichnet, dass sich der Abschnitt (12) zum Ende der Ankerstange (6) hin verjüngt.6. Anchor rod according to claim 5, characterized in that the section (12) tapers towards the end of the anchor rod (6).
7. Ankerstange nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Aussenkontur des Abschnittes (12) zur Längsachse der Ankerstange (6) um höchstens 20° geneigt ist. Ankerstange nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Ankerstange (6) mit der Stirnfläche (24) ihres durchmesserverjüngten Abschnittes (12) mit der ihr zugekehrten Seitenfläche (25) einer in den Innenraum der Übergangsmuffe (5) vorspringenden Ringrippe (20) anliegt. 7. Anchor rod according to claim 5 or 6, characterized in that the outer contour of the section (12) to the longitudinal axis of the anchor rod (6) is inclined by at most 20 °. Anchor rod according to one of claims 1 to 7, characterized in that the anchor rod (6) with the end face (24) of its tapered section (12) with the side surface (25) facing it, of an annular rib (projecting into the interior of the transition sleeve (5)) 20) is present.
EP01274371A 2001-07-19 2001-07-19 Connecting an anchoring rod to a drilling tool Expired - Lifetime EP1407115B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AT2001/000247 WO2003008763A1 (en) 2001-07-19 2001-07-19 Connecting an anchoring rod to a drilling tool

Publications (2)

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EP1407115A1 true EP1407115A1 (en) 2004-04-14
EP1407115B1 EP1407115B1 (en) 2006-03-15

Family

ID=3619083

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Application Number Title Priority Date Filing Date
EP01274371A Expired - Lifetime EP1407115B1 (en) 2001-07-19 2001-07-19 Connecting an anchoring rod to a drilling tool

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US (1) US7044678B2 (en)
EP (1) EP1407115B1 (en)
JP (1) JP4570871B2 (en)
CN (1) CN100378294C (en)
AT (2) ATE320546T1 (en)
CA (1) CA2454067C (en)
CZ (1) CZ302129B6 (en)
DE (1) DE50109210D1 (en)
DK (1) DK1407115T3 (en)
ES (1) ES2258061T3 (en)
HK (1) HK1067401A1 (en)
NO (1) NO333038B1 (en)
PL (1) PL198229B1 (en)
PT (1) PT1407115E (en)
SI (1) SI1407115T1 (en)
SK (1) SK287944B6 (en)
WO (1) WO2003008763A1 (en)

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DE50006322D1 (en) 2000-03-16 2004-06-09 Naimer H L switch
DE10336040B4 (en) * 2003-08-01 2006-12-28 Hilti Ag Adapter for a self-drilling rock anchor
AT9590U1 (en) * 2006-08-17 2007-12-15 Atlas Copco Mai Gmbh RUBBER TANK AND INFLATION ADAPTER FOR THESE
AT505072B1 (en) 2007-04-13 2009-02-15 Alwag Tunnelausbau Gmbh METHOD AND DEVICE FOR SECURING AN OBJECTED WITH AN EXTERNAL THREAD
WO2010085829A2 (en) 2009-01-27 2010-08-05 Dywidag-Systems International Gmbh Device for coupling two tubular elements
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DE102013012714A1 (en) * 2013-08-01 2015-02-05 Deilmann-Haniel Mining Systems Gmbh Shank end for a drilling and tying tool
AU2020222506A1 (en) * 2019-02-13 2021-10-07 Fci Holdings Delaware, Inc. Resin injection dolly

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Also Published As

Publication number Publication date
PT1407115E (en) 2006-05-31
SI1407115T1 (en) 2006-08-31
ES2258061T3 (en) 2006-08-16
DE50109210D1 (en) 2006-05-11
SK287944B6 (en) 2012-06-04
US20040184872A1 (en) 2004-09-23
AT8246U2 (en) 2006-04-15
SK352004A3 (en) 2005-08-04
PL367345A1 (en) 2005-02-21
CA2454067A1 (en) 2003-01-30
DK1407115T3 (en) 2006-04-10
EP1407115B1 (en) 2006-03-15
CA2454067C (en) 2009-10-27
CN1535348A (en) 2004-10-06
NO20040209L (en) 2004-03-15
CZ302129B6 (en) 2010-11-03
PL198229B1 (en) 2008-06-30
HK1067401A1 (en) 2005-04-08
AT8246U3 (en) 2010-02-15
ATE320546T1 (en) 2006-04-15
NO333038B1 (en) 2013-02-18
US7044678B2 (en) 2006-05-16
JP4570871B2 (en) 2010-10-27
WO2003008763A1 (en) 2003-01-30
CN100378294C (en) 2008-04-02
JP2004522030A (en) 2004-07-22
CZ200459A3 (en) 2004-06-16

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