EP2145078A1 - Device for producing a drill hole in rock material - Google Patents

Device for producing a drill hole in rock material

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Publication number
EP2145078A1
EP2145078A1 EP08733243A EP08733243A EP2145078A1 EP 2145078 A1 EP2145078 A1 EP 2145078A1 EP 08733243 A EP08733243 A EP 08733243A EP 08733243 A EP08733243 A EP 08733243A EP 2145078 A1 EP2145078 A1 EP 2145078A1
Authority
EP
European Patent Office
Prior art keywords
cladding tube
internal thread
drill string
slotted
drill bit
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
EP08733243A
Other languages
German (de)
French (fr)
Other versions
EP2145078B1 (en
Inventor
Josef Mocivnik
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.)
Techmo Entwicklungs und Vertriebs GmbH
Original Assignee
Techmo Entwicklungs und Vertriebs 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 Techmo Entwicklungs und Vertriebs GmbH filed Critical Techmo Entwicklungs und Vertriebs GmbH
Publication of EP2145078A1 publication Critical patent/EP2145078A1/en
Application granted granted Critical
Publication of EP2145078B1 publication Critical patent/EP2145078B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles
    • 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

Definitions

  • the invention relates to a device for producing a borehole in rock material, with a arranged on a drill string and the diameter of the drill string with its diameter exceeding drill bit, wherein the drill string is surrounded at least in the end behind the drill bit by a cladding tube, wherein a cladding tube at least one Slit part of its length is formed.
  • Devices of this type are known for example from AT 005644 Ul and from AT 007067 Ul.
  • the cladding tube provided with a longitudinal slot for the purpose of fixing an anchorage in a borehole in the radial direction expandable which widening on the one hand, in accordance with the AT 005644 Ul, by a rebound of the standing under a bias cladding tube after severing a slot bridging Welding point is effected and optionally reinforced by penetration of an intermediate element into the interior of the cladding tube, and on the other hand, according to AT 007067 Ul, alone by a shock stress of the cladding tube when driving a conical element is effected in the cladding tube.
  • the invention aims at a further development of the device described above in that setting an anchor can be done with great certainty and under particularly efficient expansion of a cladding tube.
  • impact loads which are always less easily controlled, should be avoided, and it should be feasible to achieve a widening of the cladding tube in a predetermined minimum extent feasible.
  • the slotted cladding tube has an internal thread inside over at least a portion of its slotted length and that between the internal thread and the drill bit a threaded driving mandrel is provided with an external thread, which is engageable with the internal thread, which Thread driving mandrel by means of the drill string to the engagement of its external thread with the internal thread retractable screwed into the internal thread, preferably via a positive connection to the drill string, and wherein at least one of the threads is conical.
  • a preferred embodiment is characterized in that the internal thread is provided on a threaded sleeve, which is connected to the slotted cladding tube, whereby it is possible to select the at least partially slotted cladding tube from the series production of the cladding tubes. It only has to be provided with a slot, but does not need to be provided with an internal thread. In this case, the threaded sleeve is inserted with internal thread in the otherwise standard manufactured cladding tube and connected thereto.
  • the slotted cladding is the first cladding behind the drill bit.
  • the threaded sleeve is advantageously also provided with a slot which corresponds to the slot of the cladding tube.
  • the slot of the slotted cladding tube extends in the axial direction of the drill string.
  • a manufacturing technology preferred variant is characterized in that the external thread is conical and in the internal thread of the cladding tube in a direction of rotation of the drill string opposite to the direction of rotation during drilling of the wellbore can be screwed.
  • the threaded driving mandrel comes when retracting the drill string with the drill bit in contact and is by means of the drill bit displaceable against the internal thread of Hüllrohes, wherein the drill bit at least partially penetrates into the cladding tube, with an end portion having an outer diameter which is slightly smaller than the inner diameter of the cladding tube.
  • the threaded sleeve is formed of plastic.
  • a further preferred embodiment is characterized in that the threaded friction sleeve has a closed, but radially expandable cross-section.
  • both threads are conical.
  • Fig. 1 illustrates a Schrägrissdarwolf the device with view in the interior thereof.
  • 2 and 4 show axial sectional views of the device in two different operating conditions and Figs. 3 and 5 represent to Figs. 2 and 4 are respectively end views.
  • a drill pipe 1 which is optionally composed of a plurality of sections lengthwise, has at its front end a drill bit 2.
  • the drill pipe 1 is surrounded in the end behind the drill bit 2 by a cladding tube 3, wherein if necessary depending on the depth of the hole several cladding tubes lying one behind the other, the drill string 1 can surround.
  • the design of the drill string 1 and of the cladding tube or of the cladding tubes for the purpose of removing the drill cuttings or for the purpose of supplying hardening material to be introduced into the drilled hole, such as cement mortar, can be carried out in the usual way.
  • the drill string is hollow to supply a rinse to remove the cuttings.
  • the slot 4 could also be arranged spirally, and it does not have to extend over the entire length of the cladding tube 3.
  • an internal thread 5 is provided, namely on a sleeve 6, which is also slotted according to the illustrated embodiment, wherein the slot 7 of the sleeve 6, which is hereinafter referred to as a threaded sleeve 6, is arranged in the same circumferential position as the slot 4 of the cladding tube 3.
  • the threaded sleeve 6 is connected to the cladding tube 3 non-rotatably.
  • the arrangement of the internal thread 5 not directly on the cladding tube 3, but on the threaded sleeve 6, has the advantage that the production of the cladding tube 3 is possible in a simple manner as a slotted tube.
  • a threaded driving mandrel 8 is provided, which has an external thread 9, which corresponds to the internal thread 5 of the threaded sleeve 6. At least one of the threads, so either the outer or the internal thread 9 or 5, or preferably both threads 9 and 5, are conical, so that it comes when screwing the Gewindedreibdorns 8 in the Gewindetreibhülse 6 to a widening of the cladding tube 3.
  • the threaded mandrel 8 has centrally a hexagon socket through opening 10, whereby the threaded driving mandrel 8 along the drill string 1, which at least in this section, on which the expandable sheath 3 is provided, a hexagonal cross-section 11 réelle utility, is displaceable, but with rotation of the drill string 1 is forced to turn around.
  • the threaded driving mandrel 8 is then screwed into the threaded sleeve 6, and an expansion of at least one section 15 of the cladding tube 3 occurs, as illustrated in FIG. 5.
  • the expansion of the cladding tube 3 can be precisely metered, with an increasing rotational resistance of the drill string 1 when screwing the Thread driving mandrel 8 in the Gewindetreibhülse 6 close to a sufficient anchoring of the cladding tube 3 in the borehole.
  • the threaded sleeve 6 does not necessarily have to be slotted; it may also have a closed circumference if its dimension and material still allow it to widen.
  • the threaded sleeve 6 may also be formed of plastic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

The invention relates to a device for producing a drill hole in rock material, comprising a core drill bit (2) arranged on the drill string (1) and projecting from the diameter of the drill string (1) with its diameter. The drill string (1) is surrounded by a casing pipe (3) in at least the terminal zone behind the core drill bit (2), said casing pipe (3) being slotted at least across a part of its length. The device according to the invention is characterized in that for expanding the casing pipe (3), the slotted casing pipe (3) has an internal thread (5) at least across part of its slotted length and that a thread-guided mandrel (8) having an external thread (9) is provided between the internal thread (5) and the core drill bit (2) and can be engaged with the internal thread (5). Said thread-guided mandrel (8) can be retractably screwed into the internal thread (5) by means of the drill string (1) until its external thread (9) engages with the internal thread (5), preferably by means of a form-lock connection with the drill string (1), at least one of the threads (5 or 9) being conical.

Description

Vorrichtung zum Herstellen eines Bohrloches in Gesteinsmaterial Device for producing a borehole in rock material
Die Erfindung betrifft eine Vorrichtung zum Herstellen eines Bohrloches in Gesteinsmaterial, mit einer an einem Bohrgestänge angeordneten und den Durchmesser des Bohrgestänges mit ihrem Durchmesser übersteigenden Bohrkrone, wobei das Bohrgestänge zumindest im Endbereich hinter der Bohrkrone von einem Hüllrohr umgeben ist, wobei ein Hüllrohr zumindest über einen Teil seiner Länge geschlitzt ausgebildet ist.The invention relates to a device for producing a borehole in rock material, with a arranged on a drill string and the diameter of the drill string with its diameter exceeding drill bit, wherein the drill string is surrounded at least in the end behind the drill bit by a cladding tube, wherein a cladding tube at least one Slit part of its length is formed.
Vorrichtungen dieser Art sind beispielsweise aus der AT 005644 Ul und aus der AT 007067 Ul bekannt. Bei diesen bekannten Vorrichtungen ist das mit einem Längsschlitz versehene Hüllrohr zwecks Fixierung einer Verankerung in einem Bohrloch in radialer Richtung aufweitbar, welches Aufweiten einerseits, und zwar gemäß der AT 005644 Ul, durch ein Auffedern des unter einer Vorspannung stehenden Hüllrohres nach Durchtrennen einer den Schlitz überbrückenden Schweißstelle bewirkt wird und gegebenenfalls durch Eindringen eines Zwischenelementes in das Innere des Hüllrohres verstärkt wird, und andererseits, gemäß der AT 007067 Ul, alleine durch eine Schlagbeanspruchung des Hüllrohres bei Eintreiben eines konischen Elements in das Hüllrohr bewirkt wird.Devices of this type are known for example from AT 005644 Ul and from AT 007067 Ul. In these known devices, the cladding tube provided with a longitudinal slot for the purpose of fixing an anchorage in a borehole in the radial direction expandable, which widening on the one hand, in accordance with the AT 005644 Ul, by a rebound of the standing under a bias cladding tube after severing a slot bridging Welding point is effected and optionally reinforced by penetration of an intermediate element into the interior of the cladding tube, and on the other hand, according to AT 007067 Ul, alone by a shock stress of the cladding tube when driving a conical element is effected in the cladding tube.
Aus der WO 03/062599 Al ist es bekannt, eine Verankerung in einem Bohrloch dadurch zu sichern, dass das Bohrgestänge von einem aufweitbaren Element umgeben ist, in das ein Fluid unter Druck unter wenigstens teilweisem Aufweiten des Außenumfangs des aufweitbaren Elements einbringbar ist. Diese Art der Sicherung ist aufwändig und bedingt eine absolute Dichtheit des aufweitbaren Elements.It is known from WO 03/062599 A1 to secure an anchoring in a borehole by surrounding the drill string by an expandable element into which a fluid can be introduced under pressure with at least partial widening of the outer circumference of the expandable element. This type of backup is complex and requires an absolute tightness of the expandable element.
Die Erfindung bezweckt eine Weiterentwicklung der eingangs beschriebenen Vorrichtung dahingehend, dass das Festlegen einer Verankerung mit großer Sicherheit und unter besonders effizienter Aufweitung eines Hüllrohres erfolgen kann. Insbesondere sollen Schlagbeanspruchungen, die stets weniger leicht kontrollierbar sind, vermieden werden, und es soll eine Aufweitung des Hüllrohres in einem vorbestimmten Mindestausmaß gesichert durchführbar sein.The invention aims at a further development of the device described above in that setting an anchor can be done with great certainty and under particularly efficient expansion of a cladding tube. In particular, impact loads, which are always less easily controlled, should be avoided, and it should be feasible to achieve a widening of the cladding tube in a predetermined minimum extent feasible.
Diese Aufgabe wird erfindungemäß dadurch gelöst, dass das geschlitzte Hüllrohr im Inneren über zumindest einen Teil seiner geschlitzten Länge ein Innengewinde aufweist und dass zwischen dem Innengewinde und der Bohrkrone ein Gewindetreibdorn mit einem Außengewinde vorgesehen ist, das mit dem Innengewinde in Eingriff bringbar ist, welcher Gewindetreibdorn mittels des Bohrgestänges bis zum Eingriff seines Außengewindes mit dem Innengewinde rückziehbar in das Innengewinde einschraubbar ist, vorzugsweise über eine Formschlussverbindung mit dem Bohrgestänge, und wobei zumindest eines der Gewinde konisch ausgebildet ist.This object is achieved according erfindungemäß in that the slotted cladding tube has an internal thread inside over at least a portion of its slotted length and that between the internal thread and the drill bit a threaded driving mandrel is provided with an external thread, which is engageable with the internal thread, which Thread driving mandrel by means of the drill string to the engagement of its external thread with the internal thread retractable screwed into the internal thread, preferably via a positive connection to the drill string, and wherein at least one of the threads is conical.
Dadurch, dass erfϊndungsgemäß das Aufweiten des Hüllrohres mittels eines konischen Gewindes erfolgt, lässt sich die Aufweitung genau dosieren, zumal das Aufweiten durch die Anzahl der Umdrehungen beim Einschrauben des Außengewindes des Gewindetreibdorns in das Innengewinde vorherbestimmbar ist. Weiters werden hierbei Stoßbeanspruchungen, die wiederum zum Lockern eines teilweise aufgeweiteten Hüllrohres führen könnten, vermieden.Characterized in that erfϊndungsgemäß the expansion of the cladding tube by means of a conical thread, the expansion can be precisely metered, especially since the expansion by the number of revolutions when screwing the external thread of the threaded driving mandrel is predeterminable in the internal thread. Furthermore, this impact stresses, which in turn could lead to the loosening of a partially expanded cladding avoided.
Eine bevorzugte Ausführungsform ist dadurch gekennzeichnet, dass das Innengewinde an einer Gewindetreibhülse vorgesehen ist, die mit dem geschlitzten Hüllrohr verbunden ist, wodurch es möglich ist, das zumindest teilweise geschlitzte Hüllrohr aus der Serienfertigung der Hüllrohre auszuwählen. Es muss nur mit einem Schlitz versehen werden, braucht jedoch nicht mit einem Innengewinde versehen zu werden. In diesem Fall wird die Gewindetreibhülse mit Innengewinde in das sonst serienmäßig gefertigte Hüllrohr eingesetzt und mit diesem verbunden.A preferred embodiment is characterized in that the internal thread is provided on a threaded sleeve, which is connected to the slotted cladding tube, whereby it is possible to select the at least partially slotted cladding tube from the series production of the cladding tubes. It only has to be provided with a slot, but does not need to be provided with an internal thread. In this case, the threaded sleeve is inserted with internal thread in the otherwise standard manufactured cladding tube and connected thereto.
Zweckmäßig ist das geschlitzte Hüllrohr das erste Hüllrohr hinter der Bohrkrone.Suitably, the slotted cladding is the first cladding behind the drill bit.
Um mit einer möglichst geringen Krafteinbringung ein maximales Aufweiten des Hüllrohres zu erzielen, ist vorteilhaft die Gewindetreibhülse ebenfalls mit einem Schlitz versehen, der zu dem Schlitz des Hüllrohres korrespondiert.In order to achieve a maximum expansion of the cladding tube with the least possible introduction of force, the threaded sleeve is advantageously also provided with a slot which corresponds to the slot of the cladding tube.
Vorzugsweise erstreckt sich der Schlitz des geschlitzten Hüllrohres in Achsrichtung des Bohrgestänges.Preferably, the slot of the slotted cladding tube extends in the axial direction of the drill string.
Eine fertigungstechnisch bevorzugte Variante ist dadurch gekennzeichnet, dass das Außengewinde konisch ausgebildet ist und in das Innengewinde des Hüllrohres bei einer Drehrichtung des Bohrgestänges entgegengesetzt zur Drehrichtung während des Bohrens des Bohrloches einschraubbar ist.A manufacturing technology preferred variant is characterized in that the external thread is conical and in the internal thread of the cladding tube in a direction of rotation of the drill string opposite to the direction of rotation during drilling of the wellbore can be screwed.
Um in einfacher Weise ein Eingreifen des Außengewindes des Gewindetreibdorns in das Innengewinde des Hüllrohres sicherzustellen, gelangt der Gewindetreibdorn beim Rückziehen des Bohrgestänges mit der Bohrkrone in Kontakt und ist mittels der Bohrkrone gegen das Innengewinde des Hüllrohes verschiebbar, wobei die Bohrkrone zumindest zum Teil in das Hüllrohr eindringt, und zwar mit einem Endteil, der einen Außendurchmesser aufweist, der geringfügig geringer ist als der Innendurchmesser des Hüllrohrs.To ensure easy engagement of the external thread of the threaded driving mandrel in the internal thread of the cladding tube, the threaded driving mandrel comes when retracting the drill string with the drill bit in contact and is by means of the drill bit displaceable against the internal thread of Hüllrohes, wherein the drill bit at least partially penetrates into the cladding tube, with an end portion having an outer diameter which is slightly smaller than the inner diameter of the cladding tube.
Vorzugsweise ist die Gewindetreibhülse aus Kunststoff gebildet.Preferably, the threaded sleeve is formed of plastic.
Eine weitere bevorzugte Ausführungsform ist dadurch gekennzeichnet, dass die Gewindetreibhülse einen geschlossenen, jedoch radial aufweitbaren Querschnitt aufweist.A further preferred embodiment is characterized in that the threaded friction sleeve has a closed, but radially expandable cross-section.
Bevorzugt sind beide Gewinde konisch ausgebildet.Preferably, both threads are conical.
Die Erfindung ist nachfolgend anhand von in der Zeichnung schematisch dargestellten Ausführungsbeispielen näher erläutert, wobei Fig. 1 eine Schrägrissdarstellung der Vorrichtung mit Sicht in deren Inneres veranschaulicht. Die Fig. 2 und 4 zeigen Axialschnittdarstellungen der Vorrichtung in zwei unterschiedlichen Betriebszuständen und die Fig. 3 und 5 stellen zu den Fig. 2 bzw. 4 jeweils Stirnansichten dar.The invention is explained in more detail below with reference to embodiments schematically illustrated in the drawing, wherein Fig. 1 illustrates a Schrägrissdarstellung the device with view in the interior thereof. 2 and 4 show axial sectional views of the device in two different operating conditions and Figs. 3 and 5 represent to Figs. 2 and 4 are respectively end views.
Ein Bohrgestänge 1 , das gegebenenfalls aus mehreren Abschnitten längenmäßig zusammengesetzt ist, weist an seinem vorderen Ende eine Bohrkrone 2 auf. Das Bohrgestänge 1 ist im Endbereich hinter der Bohrkrone 2 von einem Hüllrohr 3 umgeben, wobei bei Bedarf auch je nach Bohrlochtiefe mehrere Hüllrohre hintereinander liegend das Bohrgestänge 1 umgeben können. Die Ausgestaltung des Bohrgestänges 1 und des Hüllrohres bzw. der Hüllrohre zwecks Ausförderung des Bohrkleins bzw. zwecks Zuführung von in das Bohrloch einzubringendem aushärtenden Material, wie Zementmörtel, kann in üblicher Weise erfolgen. So ist beispielsweise das Bohrgestänge hohl, um Spülmittel zum Ausfördern des Bohrkleins zuzuführen.A drill pipe 1, which is optionally composed of a plurality of sections lengthwise, has at its front end a drill bit 2. The drill pipe 1 is surrounded in the end behind the drill bit 2 by a cladding tube 3, wherein if necessary depending on the depth of the hole several cladding tubes lying one behind the other, the drill string 1 can surround. The design of the drill string 1 and of the cladding tube or of the cladding tubes for the purpose of removing the drill cuttings or for the purpose of supplying hardening material to be introduced into the drilled hole, such as cement mortar, can be carried out in the usual way. For example, the drill string is hollow to supply a rinse to remove the cuttings.
Gemäß dem dargestellten Ausführungsbeispiel ist das Hüllrohr 3, das unmittelbar hinter der Bohrkrone 2 vorgesehen ist, geschlitzt ausgebildet, wobei sich der Schlitz 4 über die gesamte Länge in konstanter Breite und parallel zur Längsachse des Hüllrohres 3 erstreckt. Der Schlitz 4 könnte jedoch auch spiralförmig angeordnet sein, und er muss sich auch nicht über die gesamte Länge des Hüllrohres 3 erstrecken. Im Inneren des Hüllrohres 3 ist ein Innengewinde 5 vorgesehen, und zwar an einer Hülse 6, die gemäß dem dargestellten Ausführungsbeispiel ebenfalls geschlitzt ausgebildet ist, wobei der Schlitz 7 der Hülse 6, die nachfolgend als Gewindetreibhülse 6 bezeichnet ist, in gleicher Umfangslage angeordnet ist wie der Schlitz 4 des Hüllrohres 3. Die Gewindetreibhülse 6 ist mit dem Hüllrohr 3 unverdrehbar verbunden. Das Anordnen des Innengewindes 5 nicht direkt am Hüllrohr 3, sondern an der Gewindetreibhülse 6, bringt den Vorteil, dass die Fertigung des Hüllrohres 3 in einfacher Weise als geschlitztes Rohr möglich ist.According to the illustrated embodiment, the cladding tube 3, which is provided immediately behind the drill bit 2, formed slotted, wherein the slot 4 extends over the entire length in a constant width and parallel to the longitudinal axis of the cladding tube 3. However, the slot 4 could also be arranged spirally, and it does not have to extend over the entire length of the cladding tube 3. Inside the cladding tube 3, an internal thread 5 is provided, namely on a sleeve 6, which is also slotted according to the illustrated embodiment, wherein the slot 7 of the sleeve 6, which is hereinafter referred to as a threaded sleeve 6, is arranged in the same circumferential position as the slot 4 of the cladding tube 3. The threaded sleeve 6 is connected to the cladding tube 3 non-rotatably. The arrangement of the internal thread 5 not directly on the cladding tube 3, but on the threaded sleeve 6, has the advantage that the production of the cladding tube 3 is possible in a simple manner as a slotted tube.
Zwischen der Gewindetreibhülse 6 und der Bohrkrone 2 ist ein Gewindetreibdorn 8 vorgesehen, der ein Außengewinde 9 aufweist, das zum Innengewinde 5 der Gewindetreibhülse 6 korrespondiert. Zumindest eines der Gewinde, also entweder das Außen- oder das Innengewinde 9 bzw. 5, oder vorzugsweise beide Gewinde 9 und 5, sind konisch ausgebildet, sodass es beim Einschrauben des Gewindetreibdorns 8 in die Gewindetreibhülse 6 zu einem Aufweiten des Hüllrohres 3 kommt. Der Gewindetreibdorn 8 weist zentral eine Innensechskant-Durchgangsöffnung 10 auf, wodurch der Gewindetreibdorn 8 entlang des Bohrgestänges 1 , das zumindest in diesem Abschnitt, an dem das aufweitbare Hüllrohr 3 vorgesehen ist, einen Sechskantquerschnitt 11 außenseitigv aufweist, verschiebbar ist, jedoch mit Drehen des Bohrgestänges 1 gezwungen ist, sich mitzudrehen.Between the threaded sleeve 6 and the drill bit 2, a threaded driving mandrel 8 is provided, which has an external thread 9, which corresponds to the internal thread 5 of the threaded sleeve 6. At least one of the threads, so either the outer or the internal thread 9 or 5, or preferably both threads 9 and 5, are conical, so that it comes when screwing the Gewindedreibdorns 8 in the Gewindetreibhülse 6 to a widening of the cladding tube 3. The threaded mandrel 8 has centrally a hexagon socket through opening 10, whereby the threaded driving mandrel 8 along the drill string 1, which at least in this section, on which the expandable sheath 3 is provided, a hexagonal cross-section 11 außenseitigv, is displaceable, but with rotation of the drill string 1 is forced to turn around.
Um nach Fertigstellen des Bohrlochs das Hüllrohr 3 aufzuweiten, wird das Bohrgestänge in Achsrichtung entgegengesetzt zur Bohrrichtung 12, wie durch den Pfeil 13 veranschaulicht, zurückgezogen, wodurch ein Absatz 14 der Bohrkrone 2 mit dem Gewindetreibdorn 8 in Kontakt gelangt und diesen in Richtung zur Gewindetreibhülse 6 verschiebt. Durch Drehen des Bohrgestänges 1 entgegengesetzt zur Drehrichtung beim Bohren wird dann der Gewindetreibdorn 8 in die Gewindetreibhülse 6 eingeschraubt, und es kommt zu einem Aufweiten zumindest eines Abschnitts 15 des Hüllrohres 3, wie dies in Fig. 5 veranschaulicht ist.In order to expand the cladding tube 3 after completion of the borehole, the drill string in the axial direction opposite to the drilling direction 12, as illustrated by the arrow 13, withdrawn, whereby a shoulder 14 of the drill bit 2 comes into contact with the threaded driving mandrel 8 and this in the direction of the threaded sleeve 6th shifts. By rotating the drill string 1 opposite to the direction of rotation during drilling, the threaded driving mandrel 8 is then screwed into the threaded sleeve 6, and an expansion of at least one section 15 of the cladding tube 3 occurs, as illustrated in FIG. 5.
Durch die Wahl der Konizität der Gewinde 5 bzw. 9 und durch Wahl der Anzahl der Umdrehungen des Bohrgestänges 1 beim Einschrauben des Gewindetreibdorns 8 in die Gewindetreibhülse 6 lässt sich die Aufweitung des Hüllrohres 3 genau dosieren, wobei ein zunehmender Drehwiderstand des Bohrgestänges 1 beim Einschrauben des Gewindetreibdorns 8 in die Gewindetreibhülse 6 auf ein aureichendes Verankern des Hüllrohres 3 im Bohrloch schließen lässt.By choosing the taper of the thread 5 or 9 and by selecting the number of revolutions of the drill string 1 when screwing the Gewindedreibdorns 8 in the Gewindetreibhülse 6, the expansion of the cladding tube 3 can be precisely metered, with an increasing rotational resistance of the drill string 1 when screwing the Thread driving mandrel 8 in the Gewindetreibhülse 6 close to a sufficient anchoring of the cladding tube 3 in the borehole.
Die Gewindetreibhülse 6 muss nicht unbedingt geschlitzt ausgebildet sein; sie kann auch einen geschlossenen Umfang aufweisen, wenn ihre Dimension und ihr Material ein Aufweiten trotzdem zulassen. Beispielsweise kann die Gewindetreibhülse 6 auch aus Kunststoff gebildet sein. The threaded sleeve 6 does not necessarily have to be slotted; it may also have a closed circumference if its dimension and material still allow it to widen. For example, the threaded sleeve 6 may also be formed of plastic.

Claims

Patentansprüche : Claims:
1. Vorrichtung zum Herstellen eines Bohrloches in Gesteinsmaterial, mit einer an einem Bohrgestänge (1) angeordneten und den Durchmesser des Bohrgestänges (1) mit ihrem Durchmesser übersteigenden Bohrkrone (2), wobei das Bohrgestänge (1) zumindest im Endbereich hinter der Bohrkrone (2) von einem Hüllrohr (3) umgeben ist, wobei ein Hüllrohr (3) zumindest über einen Teil seiner Länge geschlitzt ausgebildet ist, dadurch gekennzeichnet, dass das geschlitzte Hüllrohr (3) im Inneren über zumindest einen Teil seiner geschlitzten Länge ein Innengewinde (5) aufweist und dass zwischen dem Innengewinde (5) und der Bohrkrone (2) ein Gewindetreibdorn (8) mit einem Außengewinde (9) vorgesehen ist, das mit dem Innengewinde (5) in Eingriff bringbar ist, welcher Gewindetreibdorn (8) mittels des Bohrgestänges (1) bis zum Eingriff seines Außengewindes (9) mit dem Innengewinde (5) rückziehbar in das Innengewinde (5) einschraubbar ist, vorzugsweise über eine Formschlussverbindung mit dem Bohrgestänge (1), und wobei zumindest eines der Gewinde (5 bzw. 9) konisch ausgebildet ist.1. Apparatus for producing a borehole in rock material, having a drill bit (2) arranged on a drill string (1) and exceeding the diameter of the drill string (1) with its diameter, wherein the drill pipe (1) at least in the end region behind the drill bit (2 ) is surrounded by a cladding tube (3), wherein a cladding tube (3) is formed slotted over at least part of its length, characterized in that the slotted cladding tube (3) has an internal thread (5) in the interior over at least part of its slotted length. and that between the internal thread (5) and the drill bit (2) a threaded driving mandrel (8) is provided with an external thread (9) which can be brought into engagement with the internal thread (5), which thread driving mandrel (8) by means of the drill string ( 1) to the engagement of its external thread (9) with the internal thread (5) retractable into the internal thread (5) can be screwed, preferably via a positive connection with the Bo hrgestänge (1), and wherein at least one of the threads (5 or 9) is conical.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Innengewinde (5) an einer Gewindetreibhülse (6) vorgesehen ist, die mit dem geschlitzten Hüllrohr (3) verbunden ist.2. Device according to claim 1, characterized in that the internal thread (5) on a threaded sleeve (6) is provided, which is connected to the slotted cladding tube (3).
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das geschlitzte Hüllrohr (3) das erste Hüllrohr hinter der Bohrkrone (2) ist.3. Apparatus according to claim 1 or 2, characterized in that the slotted cladding tube (3) is the first cladding behind the drill bit (2).
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Gewindetreibhülse (6) ebenfalls mit einem Schlitz (7) versehen ist, der zu dem Schlitz (4) des Hüllrohres (3) korrespondiert.4. Device according to one of claims 1 to 3, characterized in that the threaded friction sleeve (6) is also provided with a slot (7) corresponding to the slot (4) of the cladding tube (3).
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass sich der Schlitz (4) des geschlitzten Hüllrohres (3) in Achsrichtung des Bohrgestänges (1) erstreckt.5. Device according to one of claims 1 to 4, characterized in that extending the slot (4) of the slotted cladding tube (3) in the axial direction of the drill string (1).
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Außengewinde (9) konisch ausgebildet ist und in das Innengewinde (5) des Hüllrohres (3) bei einer Drehrichtung des Bohrgestänges (1) entgegengesetzt zur Drehrichtung während des Bohrens des Bohrloches einschraubbar ist. 6. Device according to one of claims 1 to 5, characterized in that the external thread (9) is conical and in the internal thread (5) of the cladding tube (3) in a direction of rotation of the drill string (1) opposite to the direction of rotation during drilling of the Boreholes can be screwed.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Gewindetreibdorn (8) beim Rückziehen des Bohrgestänges (1) mit der Bohrkrone (2) in Kontakt gelangt und mittels der Bohrkrone (2) gegen das Innengewinde (5) des Hüllrohres (3) verschiebbar ist, wobei die Bohrkrone (2) zumindest zum Teil in das Hüllrohr (3) eindringt, und zwar mit einem Endteil, der einen Außendurchmesser aufweist, der geringfügig geringer ist als der Innendurchmesser des Hüllrohrs (3).7. Device according to one of claims 1 to 6, characterized in that the threaded driving mandrel (8) when retracting the drill string (1) with the drill bit (2) comes into contact and by means of the drill bit (2) against the internal thread (5) of the Cladding tube (3) is displaceable, wherein the drill bit (2) at least partially penetrates into the cladding tube (3), with an end portion having an outer diameter which is slightly smaller than the inner diameter of the cladding tube (3).
8. Vorrichtung nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, dass die Gewindetreibhülse (6) aus Kunststoff gebildet ist.8. Device according to one of claims 2 to 7, characterized in that the threaded friction sleeve (6) is formed of plastic.
9. Vorrichtung nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, dass die Gewindetreibhülse (6) einen geschlossenen, jedoch radial aufweitbaren Querschnitt aufweist.9. Device according to one of claims 2 to 8, characterized in that the threaded friction sleeve (6) has a closed, but radially expandable cross-section.
10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass beide Gewinde (5 und 9) konisch ausgebildet sind. 10. Device according to one of claims 1 to 9, characterized in that both threads (5 and 9) are conical.
EP08733243A 2007-04-19 2008-04-18 Device for producing a drill hole in rock material Not-in-force EP2145078B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0060507A AT505335B1 (en) 2007-04-19 2007-04-19 DEVICE FOR MANUFACTURING A DRILL BIT IN ROCK MATERIAL
PCT/AT2008/000140 WO2008128266A1 (en) 2007-04-19 2008-04-18 Device for producing a drill hole in rock material

Publications (2)

Publication Number Publication Date
EP2145078A1 true EP2145078A1 (en) 2010-01-20
EP2145078B1 EP2145078B1 (en) 2010-07-28

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Application Number Title Priority Date Filing Date
EP08733243A Not-in-force EP2145078B1 (en) 2007-04-19 2008-04-18 Device for producing a drill hole in rock material

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EP (1) EP2145078B1 (en)
AT (2) AT505335B1 (en)
DE (1) DE502008001049D1 (en)
WO (1) WO2008128266A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT13292U1 (en) * 2012-07-06 2013-10-15 Dywidag Systems Int Gmbh Method and apparatus for forming wellbores and defining anchoring in the wellbore

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Publication number Priority date Publication date Assignee Title
FI905862A (en) * 1990-11-28 1992-05-29 Tampella Oy Ab BERGBULT.
DE9410370U1 (en) * 1994-07-01 1994-09-29 F. Willich Berg- Und Bautechnik Gmbh + Co, 44379 Dortmund Mountain anchor with PU foam covering
AT412739B (en) * 2002-01-22 2005-06-27 Techmo Entw & Vertriebs Gmbh METHOD AND DEVICE FOR DRILLING A HOLE IN GROUND OR ROCK MATERIAL AND FOR FORMING AN ANCHORAGE
AT7067U1 (en) * 2002-04-05 2004-09-27 Techmo Entw & Vertriebs Gmbh METHOD AND DEVICE FOR DRILLING A HOLE AND FOR FIXING AN ANCHOR IN A DRILL HOLE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008128266A1 *

Also Published As

Publication number Publication date
DE502008001049D1 (en) 2010-09-09
WO2008128266A1 (en) 2008-10-30
AT505335B1 (en) 2009-12-15
AT505335A1 (en) 2008-12-15
EP2145078B1 (en) 2010-07-28
ATE475779T1 (en) 2010-08-15

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