EP3693536A1 - Bohranordnung, bohrmaschine und verfahren - Google Patents

Bohranordnung, bohrmaschine und verfahren Download PDF

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Publication number
EP3693536A1
EP3693536A1 EP19156384.0A EP19156384A EP3693536A1 EP 3693536 A1 EP3693536 A1 EP 3693536A1 EP 19156384 A EP19156384 A EP 19156384A EP 3693536 A1 EP3693536 A1 EP 3693536A1
Authority
EP
European Patent Office
Prior art keywords
drill rod
flushing medium
feed unit
arrangement
medium hose
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.)
Withdrawn
Application number
EP19156384.0A
Other languages
English (en)
French (fr)
Inventor
Samuli Verho
Annukka KOKKONEN
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.)
Sandvik Mining and Construction Oy
Original Assignee
Sandvik Mining and Construction Oy
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 Sandvik Mining and Construction Oy filed Critical Sandvik Mining and Construction Oy
Priority to EP19156384.0A priority Critical patent/EP3693536A1/de
Publication of EP3693536A1 publication Critical patent/EP3693536A1/de
Withdrawn legal-status Critical Current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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes

Definitions

  • the invention relates to a drilling arrangement for a mine drilling machine.
  • the invention further relates to a mine drilling machine.
  • the invention still further relates to a method for drilling a hole into a rock.
  • the need for continuous drilling arises especially in the low profile (LP) and extra low profile (XLP) mines where rock support is a critical part of the process.
  • the height of the mine gallery may be as low as 1.2 meters. Due to the rock conditions it is necessary to install up to 2-6 meter long rock reinforcement bolts to the roof of the mine.
  • a document EP2896780 discloses a flexible drill rod for continuous drilling, in which adding of rods may be avoided. However, there are some aspects regarding sliding of the drill rod that could be improved or developed further.
  • a drilling arrangement for a mine drilling machine comprising a hollow, flexible and rotatable drill rod, a feed unit for rotating said drill rod, a feed beam arranged to support the feed unit and comprising a feed unit for feeding said drill rod, a flushing medium hose connected to the drill rod arranged for providing flushing medium in the drill rod, a flushing medium connector connecting the flushing medium hose to the drill rod, the connector enabling the flushing medium hose remaining unrotating while the drill rod is rotating, wherein the arrangement further comprises an auxiliary feed unit arranged to contact with the flushing medium hose for moving the drill rod by pushing or pulling said flushing medium hose.
  • a mine drilling machine comprising the drilling arrangement described above.
  • a method for drilling a hole into a rock comprising using a hollow, flexible and rotatable drill rod, rotating the drill rod by a feed unit, feeding the drill rod into the rock by said feed unit, providing flushing medium in the drill rod in a rear end thereof by using a flushing medium hose, keeping the flushing medium hose unrotating, and moving the drill rod by pushing or pulling the flushing medium hose.
  • the auxiliary feed unit comprises a contact element being a rotating roll or an endless chain or belt.
  • the auxiliary feed unit is also arranged, on demand, to pull the flushing medium hose in direction opposite to the pushing direction.
  • the auxiliary feed unit is arranged to move the flushing medium hose in the same direction as the feed unit is feeding said drill rod.
  • the arrangement comprises a control unit arranged to control the moving force of the auxiliary feed unit exerting to the flushing medium hose.
  • the feed beam comprises a rod holder arranged at a front end of the feed beam for supporting the drill rod, the rod holder being without a drill rod engaging element.
  • a guiding element is arranged between the feed unit and the auxiliary feed unit to bend the drill rod.
  • the guiding element comprises a guiding tube.
  • a front guiding element is provided in front side of the feed unit for supporting the drill rod.
  • the flushing medium connector comprises a first end attached to the drill rod, and a second end attached to the hose and arranged coaxially with the first end.
  • Figure 1 is a schematic side view of a drilling arrangement and method in partial cross-section.
  • the drilling arrangement 100 is arranged in a mine M comprising floor F and roof R.
  • the drilling arrangement 100 is shown in drilling a hole on the roof R.
  • the drilling arrangement 100 may also be used for drilling the floor or walls of the mine M.
  • a flexible drill rod 2 is used in the arrangement 100.
  • the flexible drill rod 2 is also hollow and rotatable drill, a feed unit 1 being arranged for rotating said drill rod 2.
  • a drill bit In the front end of the drill rod 2 there is arranged a drill bit (not shown).
  • the drilling arrangement 100 further comprises a feed beam 4 arranged to support a feed unit 1 that feeds and rotates the drill rod 2 in the hole being drilled.
  • the feed unit 1 comprises a rotation chuck (not shown) that may grip tightly to the drill rod 2 when the feed unit 1 starts rotating and pushing the drill rod 2 into the hole, such that the torque and the thrust are transmitted to the drill rod 2 and further to the drill bit.
  • a rotation chuck (not shown) that may grip tightly to the drill rod 2 when the feed unit 1 starts rotating and pushing the drill rod 2 into the hole, such that the torque and the thrust are transmitted to the drill rod 2 and further to the drill bit.
  • the feed beam 4 comprises a rod holder 11 arranged at a front end of the feed beam for supporting the drill rod 2.
  • a flushing medium hose 8 is connected to the drill rod 2 and arranged for providing flushing medium in the drill rod 2.
  • the flushing medium is liquid, such as water.
  • the flushing medium is gas or gas mixture, such as air.
  • the flushing medium is a mixture of liquid and gas, such as water and air.
  • the flushing medium hose 8 has a bendable structure.
  • a flushing medium connector 7 connects the flushing medium hose 8 to the drill rod 2.
  • the connector allows flushing medium to flow form the flushing medium hose 8 to the drill rod 2, and enables the flushing medium hose 8 to remain unrotating while the drill rod 2 is rotating.
  • the structure of the connector is described more detailed in connection with Figure 3 .
  • a guiding element 5, such as a guiding tube, is arranged between the feed unit 1 and the auxiliary feed unit 3.
  • the guiding element 5 may bend the drill rod 2. This facilitates that the drill rod 5 may be fed to the feed beam 4 in a direction that may be e.g. at least essentially parallel with the floor F or roof R of the mine, and then turned towards e.g. said floor F or roof R.
  • the guiding tube has a fixed shape, e.g. it is always changing the direction of the drill rod 2 in a same way. In another embodiment, the shape of the guiding tube may be changed or adjusted. In an embodiment, the guiding element 5 comprises a series of guiding loops or rings etc.
  • the feed beam 4 comprises a rod holder 11 arranged at a front end of the feed beam for supporting the drill rod 2.
  • a front guiding element 12 is provided in front side of the feed unit 1 for supporting the drill rod 2 after the feed unit 1.
  • the arrangement 100 further comprises an auxiliary feed unit 3 that is arranged to contact with the flushing medium hose 8.
  • the auxiliary feed unit 3 moves the drill rod 2 in its axial direction by pushing or pulling the flushing medium hose 8.
  • the auxiliary feed unit 3 has a contact element 9 that is arranged in contact with the flushing medium hose 8.
  • the contact element 9 transmits power to the flushing medium hose 8 by e.g. frictional forces.
  • the contact element 9 comprises a rotating roll or a pair of rolls arranged on different sides of the flushing medium hose 8.
  • the contact element 9 comprises an endless chain or belt, or a pair of such chains or belts arranged on different sides of the flushing medium hose 8.
  • the contact element 9 comprises at least one rotating roll and at least one endless chain or belt arranged on different sides of the flushing medium hose 8.
  • the auxiliary feed unit 3 may be driven e.g. electrically, pneumatically or hydraulically.
  • the auxiliary feed unit 3 is arranged, on demand, to push the flushing medium hose 8 in the same direction as the feed unit 1 is feeding the drill rod, i.e. towards the hole to be drilled. Pushing the flushing medium hose 8 in the same direction as the feed unit 1 facilitates fluent movement of the rod 2 sliding through the guiding element 5, if any. Said pushing towards the hole also facilitates fluent movement between the rod 2 and the feed unit 1 when the feed unit 1 is moved backwards for a new drilling stroke.
  • the auxiliary feed unit 3 may be arranged to pull the flushing medium hose 8 and the drill rod 2 therewith in an opposite direction, away from the hole. Thanks to this, extracting the drill rod 2 from hole may be at least partly, or even totally, taken care of by the auxiliary feed unit 3.
  • the auxiliary feed unit 3 makes it possible to realize the rod holder 11 without any drill rod engaging element, simplifying the structure of the rod holder 11.
  • the rod holder 11 may thus be very thin, which in turn extends the effective drilling stroke e.
  • FIG. 2 is a schematic view of a flexible drill rod.
  • the drill rod 2 may comprise a tube 19 and at least one corrugated cut 20 extending through the wall of the tube 19 in a transverse direction thereof, in other words in a direction transverse to the longitudinal axis D of the drill rod 2.
  • the corrugated cut 20 extends at each point substantially radially through the tube wall from the outside of the tube to the inside of the tube.
  • each corrugated cut 20 have a substantially spiral baseline 21 extending in a circulating manner around the tube 19 in the direction of longitudinal axis D from the direction of a first end of the drill rod to a direction of a second end of the drill rod.
  • Each corrugated cut 20 may be arranged to deviate from its baseline 21 on both sides of the baseline 21 forming a cut of a substantially corrugated shape.
  • the baseline 21 is not a physical part of the corrugated cut 20, but a virtual line on both sides of which the corrugated cut extends at each portion of the drill rod 2.
  • the corrugated cut 20 may comprise curved portions of one or several radiuses.
  • the corrugated cut 20 may also comprise straight portions connecting the curved portions.
  • the straight portions may be substantially parallel to the direction of the baseline 21, substantially perpendicular to the direction of the baseline 21 and/or arranged at an angle with respect to the baseline 21.
  • This corrugated cut 20 may then spiral along the tube 19.
  • the corrugated cut 20 may circulate around the drill rod 2, more particularly around the longitudinal axis D of the drill rod 2.
  • the shape of the corrugated cut 20 is of a teardrop-like shape.
  • the drill rod 2 may be made at the same time flexible, such that bending of the drill rod 2 is enabled in a transverse direction of the drill rod 2, and rigid, such that transmitting torque and thrust needed for drilling is enabled.
  • the bending radius of the tube 19 is less than 1 meter, ad preferably under 0.5 meter. This enables bending the drill rod 2 also at low drilling spaces and achieving an optimal amount of uninterrupted drilling at any circumstances using as much of the available drilling height as possible.
  • the corrugated cut 20 may be formed by laser cutting and/or high pressure water jet cutting.
  • the corrugated cut 20, even though very narrow, causes un-conformity and discontinuity on the outer surface of the drill rod 2. As a consequence, it may occur that the drill rod 2 slightly sticks or freezes in the feed unit or in the guiding element(s). In other words, moving or sliding of the drill rod 2 through the feed unit or the guiding element(s) is not smooth, which has a negative effect to the drilling process. Additionally, the drill rod or the feed unit or the guiding element may be damaged or even broken due to said sticking or freezing.
  • the auxiliary feed unit 2 eliminates or at least decreases this problem by pushing the corrugated cut 20 as narrow as possible and thus levelling out the outer surface of the drill rod 2.
  • FIG 3 is a schematic side view of a flushing medium connector.
  • the connector 7 comprises a first end 13 attached to the back end of the drill rod 2, and a second end 14 attached to the flushing medium hose 8 and arranged coaxially with the first end 13.
  • the ends 13, 14 are provided with corresponding fastening elements 16, 17 for receiving the drill rod and the flushing medium hose, respectively.
  • a channel 18 extends through the connector 7 in direction of the longitudinal axis X thereof for passing flushing medium from the hose 8 to the drill rod 2.
  • a rotary connection element 15 This element attaches the ends 13, 14 together and allows their mutual rotation around their common longitudinal axis X.
  • the rotary connection element 15 is unrotatably attached to one of the ends 13, 14, and thus, it may rotate only in respect to another of said ends.
  • the rotary connection element 15 is rotatably attached to both of the ends 13, 14.
  • FIG 4 is a schematic side view of a mine drilling machine.
  • the mine drilling machine 22 comprises at least one drilling arrangement 100 discussed in this description.
  • the mine drilling machine 22 may comprise a boom 3 that is provided with the drilling arrangement 100. This particular type of a mine drilling machine 22 is especially suitable for tunnels and other drilling spaces of limited height, such as low profile mines.
  • the mine drilling machine 22 may comprise not only drilling arrangement(s) 100 described in this description, but also other type of mining equipment.
  • the drilling arrangement 100 is provided with a control unit 10 arranged to control the auxiliary feed unit 3.
  • the control unit 10 is arranged in the mine drilling machine 22.
  • the control unit may control the moving force of the auxiliary feed unit 3 exerted to the flushing medium hose 8, speed of the pushing or pulling in terms of absolute values and/or in relation to the movements of the feed unit 1, etc.
  • Figure 5 illustrates a method for drilling a hole into a rock.
  • the method comprises using 501 a hollow, flexible and rotatable drill rod, rotating 502 the drill rod 2 by a feed unit, feeding 503 the drill rod into the rock by said feed unit, 504 providing flushing medium in the drill rod in a rear end thereof by using a flushing medium hose, keeping 505 the flushing medium hose unrotating, and moving 506 the drill rod by pushing or pulling the flushing medium hose.
  • the drill rod is pulled, at demand, in direction opposite to the pushing direction.
  • the auxiliary feed unit exerts to the flushing medium hose.
  • the hole is drilled in a continuous way.

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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)
EP19156384.0A 2019-02-11 2019-02-11 Bohranordnung, bohrmaschine und verfahren Withdrawn EP3693536A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19156384.0A EP3693536A1 (de) 2019-02-11 2019-02-11 Bohranordnung, bohrmaschine und verfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19156384.0A EP3693536A1 (de) 2019-02-11 2019-02-11 Bohranordnung, bohrmaschine und verfahren

Publications (1)

Publication Number Publication Date
EP3693536A1 true EP3693536A1 (de) 2020-08-12

Family

ID=65408937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19156384.0A Withdrawn EP3693536A1 (de) 2019-02-11 2019-02-11 Bohranordnung, bohrmaschine und verfahren

Country Status (1)

Country Link
EP (1) EP3693536A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5360075A (en) * 1993-11-29 1994-11-01 Kidco Resources Ltd. Steering drill bit while drilling a bore hole
US6315052B1 (en) * 1997-06-25 2001-11-13 Kjell I. Sola Method and a device for use in coiled tubing operations
US20060048933A1 (en) * 2004-09-07 2006-03-09 John Van Way Method and apparatus for spooled tubing operations
WO2010050870A1 (en) * 2008-10-29 2010-05-06 Atlas Copco Rock Drills Ab Injecting device, drill rig and method of rock bolting
EP2896780A1 (de) 2014-01-17 2015-07-22 Sandvik Mining and Construction Lyon SAS Flexible Bohrstange

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5360075A (en) * 1993-11-29 1994-11-01 Kidco Resources Ltd. Steering drill bit while drilling a bore hole
US6315052B1 (en) * 1997-06-25 2001-11-13 Kjell I. Sola Method and a device for use in coiled tubing operations
US20060048933A1 (en) * 2004-09-07 2006-03-09 John Van Way Method and apparatus for spooled tubing operations
WO2010050870A1 (en) * 2008-10-29 2010-05-06 Atlas Copco Rock Drills Ab Injecting device, drill rig and method of rock bolting
EP2896780A1 (de) 2014-01-17 2015-07-22 Sandvik Mining and Construction Lyon SAS Flexible Bohrstange

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