EP0748923B1 - Bohrstange - Google Patents

Bohrstange Download PDF

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Publication number
EP0748923B1
EP0748923B1 EP19960109669 EP96109669A EP0748923B1 EP 0748923 B1 EP0748923 B1 EP 0748923B1 EP 19960109669 EP19960109669 EP 19960109669 EP 96109669 A EP96109669 A EP 96109669A EP 0748923 B1 EP0748923 B1 EP 0748923B1
Authority
EP
European Patent Office
Prior art keywords
drill
rod
thread
bit
socket
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
EP19960109669
Other languages
English (en)
French (fr)
Other versions
EP0748923A2 (de
EP0748923A3 (de
Inventor
Nigel Roberts
John O'brien
Kjell Andersson
Derek Loughlin
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.)
Boart Longyear Ltd
Original Assignee
Boart Longyear Ltd
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 Boart Longyear Ltd filed Critical Boart Longyear Ltd
Publication of EP0748923A2 publication Critical patent/EP0748923A2/de
Publication of EP0748923A3 publication Critical patent/EP0748923A3/de
Application granted granted Critical
Publication of EP0748923B1 publication Critical patent/EP0748923B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • the invention relates to a drill rod and a drill string, for use in rock drilling.
  • a drill rod for rock drilling having at one end a thread through which the rod can be connected to other drill rods and at the other end a socket with a female internal thread adapted to receive a male threaded rock drill bit therein characterised in that an external male thread is provided on the external surface of the socket.
  • the invention also provides a drill string comprising at least one drill rod as set forth above and a male threaded drill bit adapted to be screwed into the female threaded socket.
  • the drill bit is preferably constructed such that, when the bit is screwed into the socket in the rod, the peripheral skirt of the drill bit is substantially flush with the external surface of the rod.
  • the external surface of the socket in the rod may additionally have an external male thread thereon.
  • the female thread, and the male thread when present, are preferably rope threads.
  • Particularly suitable thread forms are R28 for the internal socket thread and the external bit thread, and HM45 for the external male thread on the socket.
  • the drill rod is preferably hexagonal in section, with a central round bore therethrough for the passage of flushing fluid. If the across flats dimension of the rod is 40 mm, the bore diameter can be 19 mm.
  • the rod is preferably of steel, conveniently EN 40B.
  • the drill rod 1 shown in Figure 3 is a hollow drill steel with hexagonal exterior shape over the major part of its length.
  • a male thread 2 typically known as R38 (or alternatively HM38) which is for connection to a rock drill, either directly or with the interposition of other extension rods.
  • the other end forms a socket which has both a male thread 3 on the outside and a female thread 4 on the inside.
  • a drill bit 5 with a male threaded connector 16 can be screwed into the female thread at the bit end of the drill rod.
  • the drill face diameter of the drill bit 5 is slightly larger than the male thread diameter 3 on the drill rod (eg. 48mm on the drill bit and 45mm on the drill rod). This drill bit 5 is used for drilling profile holes.
  • centre holes 20 ( Figure 5) are required which will be a larger diameter than the profile holes 22 and other charge holes 24. This is for the purpose of acting as blast relief holes which are not charged with explosive and as such allow the rock to collapse during the blasting action of the explosive charges.
  • the centre relief holes 20 can be drilled using a female threaded drill bit 6.
  • the thread 7 of this bit screws onto the male thread 3 at the bit end of the rod 1.
  • the diameter of the male thread 3 at the bit end of the rod is such that it acts as a stabiliser for the drill rod, when drilling profile holes, in order to minimise rod deflection. This feature will improve drill string rigidity and hence reduce drill hole deviation.
  • the male thread at the bit end is of a diameter similar to the outside diameter of the drill bit used to drill the profile holes.
  • FIG. 6 shows opposite ends of an alternative form of drill rod in accordance with the invention.
  • the right hand end as shown in the drawings has a socket 30 with a female thread 32 on the inside. This thread will be one of those conventionally used in drill strings.
  • Figure 7 shows a cross-section through the centre part of the string, on the line VII-VII.
  • the hexagonal outer shape of the rod can be clearly seen, with a centre bore 34 for flushing fluid.
  • Figure 8 shows a drill bit for use with the rod of Figures 6 and 7.
  • the bit has a male threaded shaft 26 which will screw into the female thread 32 in the socket 30.
  • Figure 9 is a cross-section through the bit shown in Figure 9, and Figure 10 is a view of the end (cutting) face of the same bit.
  • the invention allows the use of spiral or straight hole drilling bits to be used for the centre holes for the purpose of improving hole directional stability.
  • the process of driving a tunnel through rock in either mining or civil engineering applications is to drill a pattern of holes to a set depth (tunnel advance distance).
  • the pattern of holes (see figure 5) consists of an outer ring of holes 22, called profile holes, which define the tunnel shape, other charge holes 24 of diameter equal to the profile holes across the tunnel face and relief holes 20 of a larger diameter in the centre.
  • the drill rod 1 is used with the drill bit 5 to drill the profile and other charge holes 22, 24 and then the drill bit is changed to a larger diameter industry standard female threaded drill bit 6 to drill the centre relief holes 20 in one pass.
  • the outside diameter of the male thread 3 on the rod provides drill hole stabilising action to enhance drill hole straightness and stability.
  • the male thread 3 on the rod has the additional function of coupling with a female thread 7 of a standard drill bit 6 of a diameter suitable to drill the centre relief holes required on a tunnel face.
  • the male threaded drill bit 5 couples to the drill rod 1.
  • the diameter of the drill bit is such that the rod external surface can act as a stabiliser during drilling to enhance drill hole straightness.

Landscapes

  • 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)

Claims (7)

  1. Bohrstange (1) zum Bohren in Gestein, die an einem Ende ein Gewinde (2), durch das die Stange mit anderer. Bohrstangen verbunden werden kann, und am anderen Ende eine Fassung mit einem Innengewinde (4), das darin einen mit einem Außengewinde versehenen Gesteinsbohrkopf (5) aufnehmen kann, aufweist, dadurch gekennzeichnet, daß an der Außenfläche der Fassung ein Außengewinde (3) vorgesehen ist.
  2. Bohrgestänge, das aus mindestens einer Bohrstange (1) nach Anspruch 1 und einem mit einem Außengewince versehenen Gesteinsbohrkopf (5) besteht, der in die Fassung (4) mit dem Innengewinde geschraubt werden kann.
  3. Bohrgestänge nach Anspruch 2, bei dem der Bohrkopf (5) derart aufgebaut ist, daß beim Einschrauben des Kopfs in die Fassung (4) in der Stange (1) der Umfangsrand des Bohrkopfs mit der Außenfläche der Stange im wesentlichen bündig ist.
  4. Bohrstange oder Bohrgestänge nach einem der vorhergehenden Ansprüche, bei der/dem das Innengewinde (4) und das Außengewinde (3) Seilgewinde sind.
  5. Bohrstange oder Bohrgestänge nach Anspruch 4, bei der/dem das Innenfassungsgewinde (4) und das Außenkopfgewinde die Gewindeform R28 und das Außengewinde (3) an der Fassung die Gewindeform HM45 aufweisen.
  6. Bohrstange oder Bohrgestänge nach einem der vorhergehenden Ansprüche, bei der/dem die Bohrstange (1) im Schnitt hexagonal ist und durch sie eine mittlere Rundbohrung (34) für den Durchtritt von Spülflüssigkeit verläuft.
  7. Bohrstange oder Bohrgestänge nach einem der vorhergehenden Ansprüche, bei der/dem die Stange (1) aus Stahl der Qualität EN40B besteht.
EP19960109669 1995-06-16 1996-06-17 Bohrstange Expired - Lifetime EP0748923B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9512250.3A GB9512250D0 (en) 1995-06-16 1995-06-16 A drill string
GB9512250 1995-06-16

Publications (3)

Publication Number Publication Date
EP0748923A2 EP0748923A2 (de) 1996-12-18
EP0748923A3 EP0748923A3 (de) 1997-10-29
EP0748923B1 true EP0748923B1 (de) 2001-11-28

Family

ID=10776167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960109669 Expired - Lifetime EP0748923B1 (de) 1995-06-16 1996-06-17 Bohrstange

Country Status (3)

Country Link
EP (1) EP0748923B1 (de)
DE (1) DE69617320T2 (de)
GB (1) GB9512250D0 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2019100881B4 (en) * 2018-08-10 2022-06-30 Xceed Mining Services Pte. Ltd. Blast hole drilling

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1477855A (en) * 1922-04-18 1923-12-18 Fred W Thurston Drill
US1865585A (en) * 1929-03-08 1932-07-05 George C Riley Rock drill
NL6609441A (de) * 1965-07-08 1967-01-09
SE318537B (de) * 1968-04-10 1969-12-15 Sandvikens Jernverks Ab
US3537738A (en) * 1968-04-15 1970-11-03 Sandvikens Jernverks Ab Drill rod for long hole drilling in the ground
US3554303A (en) * 1968-08-02 1971-01-12 William Zajkowski Earth piercing apparatus and method
US3519090A (en) * 1968-12-09 1970-07-07 Bobby R Herring Straight hole tool
DE4127249C1 (de) * 1991-08-17 1993-02-04 Gd-Anker Gmbh, 3370 Seesen, De

Also Published As

Publication number Publication date
DE69617320D1 (de) 2002-01-10
EP0748923A2 (de) 1996-12-18
GB9512250D0 (en) 1995-08-16
EP0748923A3 (de) 1997-10-29
DE69617320T2 (de) 2002-07-25

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