WO1999045237A1 - An arrangement for drilling slots - Google Patents

An arrangement for drilling slots Download PDF

Info

Publication number
WO1999045237A1
WO1999045237A1 PCT/SE1999/000244 SE9900244W WO9945237A1 WO 1999045237 A1 WO1999045237 A1 WO 1999045237A1 SE 9900244 W SE9900244 W SE 9900244W WO 9945237 A1 WO9945237 A1 WO 9945237A1
Authority
WO
WIPO (PCT)
Prior art keywords
machine
drilling
carrier sleeve
drill bit
sleeve
Prior art date
Application number
PCT/SE1999/000244
Other languages
French (fr)
Inventor
Magnus HÖRMAN
Original Assignee
G-Drill Ab
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 G-Drill Ab filed Critical G-Drill Ab
Priority to CA002322693A priority Critical patent/CA2322693C/en
Priority to AU27532/99A priority patent/AU2753299A/en
Publication of WO1999045237A1 publication Critical patent/WO1999045237A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10—Making by using boring or cutting machines
    • E21D9/1053—Making by using boring or cutting machines for making a slit along the perimeter of the tunnel profile, the remaining core being removed subsequently, e.g. by blasting
    • 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
    • E21B19/24—Guiding or centralising devices for drilling rods or pipes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/003—Bearing, sealing, lubricating details
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/001—Drilling a non circular hole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
    • E21C25/58—Machines slitting by drilling hole on hole

Definitions

  • This invention relates to an arrangement for drilling slots with a down-hole rock drilling machine. Such machines move into the borehole.
  • Such drilling of slots by means of a top hammer (a rock-drilling machine outside of the borehole) is known for example from SE-B-420435.
  • Figure 1 shows, in a longitudinal section, an arrangement for drilling slots in rock as an example of the invention.
  • Figure 2 shows, in a transverse section, a slot bored with the arrangement shown in figure 1.
  • Figure 1 shows a rock-drilling machine with a housing 10 that comprises a machine tube 11, a backhead 12 screwed to the machine tube 11, and a drill bit holding sleeve 13 screwed to the machine tube.
  • the bit holding sleeve 13 is in splined connection with the shank 15 of the drill bit 14 and the drill bit is limitedly movable axially in the sleevel3.
  • Inside the machine housing there is a non-illustrated piston hammer and a valving arrangement for driving the hammer piston so that it will impact on the end face of the drill bit shank 15 with a frequency of 50-100 Herz.
  • the drive medium for driving the piston hammer can be a pressure fluid such as compressed air or a pressurised liquid, for example water, conventionally supplied through the non-illustrated drilling tube to which the backhead 12 is screwed.
  • the spent drive fluid exits through channels in the drill bit head and is used as a flushing fluid for flushing away the debris.
  • the machine tube 11 has a shoulder 17 and between the shoulder 17 and the drill bit holding sleeve 13 are axially held: a bearing that comprises two sleeves 20,21, a carrier sleeve 22, a bearing that comprises two sleeves 23,24, and a distance holding sleeve 25 that has a splined 2 connection to the machine tube 11.
  • the carrier tube 22 has a clearance to the machine housing 11 and it has a lubricant nipple 26 through which lubricant can be supplied to the clearance for lubricating the bearings 20,21 and 23,24.
  • the sleeves 20,23 of the bearings have radial fit to the machine housing 11 so that they rotate with the housing whereas the sleeves 21,24 of the bearings have radial fit to the carrier sleeve 22 so that they do not rotate with the machine tube 11.
  • the bearings 21,22 and 23,24 serve both as radial bearings and axial bearings for the carrier sleeve 22 on the machine tube 11.
  • the distance holding sleeve 25 has key grips 27 to permit for breaking of the thread between the machine tube 11 and the bit holding sleeve 13.
  • the splined connection between the distance holding sleeve 25 and the machine housing 11 is there to permit for such a breaking.
  • the carrier sleeve 22 carries an elongate tubular guiding element 30 through an intermediate element 31 that is welded both to the guiding tube 30 and to the carrier sleeve 22.
  • the front end of the intermediate element 31 forms an inclined breaking surface.
  • the guiding tube has an opening 33 arranged to make it possible to reach the key grip 27 with a key or spanner.
  • the rear end of the guiding tube 30 has a bushing 34 welded to it and the bushing has an interior thread to which an extension can be mounted when the rock is incompetent and a long guiding element is necessary.
  • the front end of the guiding tube 30 has a similar bushing 35 welded to it and the bushing is plugged by a plug 36.
  • a suction hose from a vacuum cleaner can be coupled to the bushing 34. Then the debris is sucked into the guiding tube 30 through the hole 33.
  • the angle between the inclined surface 32 and the carrier sleeve 22 should preferably be between 10 and 45 degrees.
  • the guiding tube 30 should have a diameter that is so much smaller than the nominal diameter of the drill bit that the normal wear on the diameter of the drill bit will not cause the machine to get stuck.
  • the diameter of the guiding tube can for example be 203 mm if the nominal diameter of the drill bit is 211 mm.
  • One field of use for the described slot drilling arrangement is the drilling of opening slots in tunnel driving and raise driving.
  • driving a raise one can for example drill 40 m long slots and then blast the entire 40 meters in a single blast.

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)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Earth Drilling (AREA)

Abstract

A down-hole rock drilling machine (in-hole rock drilling machine) has a carrier sleeve (22) mounted in combined axial and radial bearings (21, 22 and 23, 24) and the carrier sleeve carries a guiding tube (30) laterally of the machine with an element (31) inbetween. The bearings (21, 22 and 23, 24) and the carrier sleeve (22) are held axially together between a shoulder (17) on the machine housing (11) and a drill bit holding sleeve (13). The machine housing will be subjected to strong vibrations, but since the bit holding sleeve (13) is screwed to the machine housing (11) and transmits the rotation to the drill bit (14), the carrier sleeve bearing arrangement will be secured.

Description

An arrangement for drilling slots
This invention relates to an arrangement for drilling slots with a down-hole rock drilling machine. Such machines move into the borehole.
Such drilling of slots by means of a top hammer (a rock-drilling machine outside of the borehole) is known for example from SE-B-420435.
It is an object of the invention to make possible the drilling of slots also by using a down- hole drilling machine and the invention has been given the characteristics defined in the claims.
The invention will be described with reference to the accompanying drawings.
Figure 1 shows, in a longitudinal section, an arrangement for drilling slots in rock as an example of the invention.
Figure 2 shows, in a transverse section, a slot bored with the arrangement shown in figure 1.
Figure 1 shows a rock-drilling machine with a housing 10 that comprises a machine tube 11, a backhead 12 screwed to the machine tube 11, and a drill bit holding sleeve 13 screwed to the machine tube. The bit holding sleeve 13 is in splined connection with the shank 15 of the drill bit 14 and the drill bit is limitedly movable axially in the sleevel3. Inside the machine housing there is a non-illustrated piston hammer and a valving arrangement for driving the hammer piston so that it will impact on the end face of the drill bit shank 15 with a frequency of 50-100 Herz. The drive medium for driving the piston hammer can be a pressure fluid such as compressed air or a pressurised liquid, for example water, conventionally supplied through the non-illustrated drilling tube to which the backhead 12 is screwed. The spent drive fluid exits through channels in the drill bit head and is used as a flushing fluid for flushing away the debris.
The machine tube 11 has a shoulder 17 and between the shoulder 17 and the drill bit holding sleeve 13 are axially held: a bearing that comprises two sleeves 20,21, a carrier sleeve 22, a bearing that comprises two sleeves 23,24, and a distance holding sleeve 25 that has a splined 2 connection to the machine tube 11. The carrier tube 22 has a clearance to the machine housing 11 and it has a lubricant nipple 26 through which lubricant can be supplied to the clearance for lubricating the bearings 20,21 and 23,24. The sleeves 20,23 of the bearings have radial fit to the machine housing 11 so that they rotate with the housing whereas the sleeves 21,24 of the bearings have radial fit to the carrier sleeve 22 so that they do not rotate with the machine tube 11. Thus the bearings 21,22 and 23,24 serve both as radial bearings and axial bearings for the carrier sleeve 22 on the machine tube 11.
Since the bit holding sleeve 13 transmits the torque to the drill bit during drilling, there is no risk that the bearings for the carrier sleeve 22 should loosen because of the vibrations. The distance holding sleeve 25 has key grips 27 to permit for breaking of the thread between the machine tube 11 and the bit holding sleeve 13. The splined connection between the distance holding sleeve 25 and the machine housing 11 is there to permit for such a breaking.
The carrier sleeve 22 carries an elongate tubular guiding element 30 through an intermediate element 31 that is welded both to the guiding tube 30 and to the carrier sleeve 22. The front end of the intermediate element 31 forms an inclined breaking surface. The guiding tube has an opening 33 arranged to make it possible to reach the key grip 27 with a key or spanner. The rear end of the guiding tube 30 has a bushing 34 welded to it and the bushing has an interior thread to which an extension can be mounted when the rock is incompetent and a long guiding element is necessary. The front end of the guiding tube 30 has a similar bushing 35 welded to it and the bushing is plugged by a plug 36.
When a compressed air driven downhole drilling machine is used, a suction hose from a vacuum cleaner can be coupled to the bushing 34. Then the debris is sucked into the guiding tube 30 through the hole 33.
When drilling a slot, the operator drills a first borehole with a down-hole drilling machine that has a machine housing 10 with an even outer tubular surface, that is, a housing without a carrier sleeve 22. With the arrangement shown in figure 1, he then drills a hole at the side of the first hole and with the guiding tube 30 guided by the first hole. Usually, the rock between the two holes will crack continuously by the forces resulting from the movement of 3 the drill bit 14. In this way the operator can continue to drill hole by hole so that a slot will result. Figure 2 shows a three-hole slot.
When the drill bit becomes worn so that its diameter is reduced, it may occur that the wall between two holes does not break by itself. Then, the inclined front surface 32 of the intermediate element 31 will break this wall and because the surface is adjacent the machine housing, there will be a transverse resultant force on the surface 32 which forces the drill bit towards the pilot hole. This transverse force will prevent a continually increased wall thickness and thereby, it will prevent the drilling arrangement to get stuck. The angle between the inclined surface 32 and the carrier sleeve 22 should preferably be between 10 and 45 degrees. The guiding tube 30 should have a diameter that is so much smaller than the nominal diameter of the drill bit that the normal wear on the diameter of the drill bit will not cause the machine to get stuck. The diameter of the guiding tube can for example be 203 mm if the nominal diameter of the drill bit is 211 mm.
In stead of using the bit holding sleeve 13 for axially securing the bearings 20,21;23,24 and the carrier sleeve 22, one could use the backhead 12 since the thread connection between the backhead 12 and the machine housing 10 transmits the same torque as does the thread connection between the bit holding sleeve 13 and the machine tube 11.
One field of use for the described slot drilling arrangement is the drilling of opening slots in tunnel driving and raise driving. When driving a raise, one can for example drill 40 m long slots and then blast the entire 40 meters in a single blast.

Claims

Claims
1. An arrangement for drilling slots with a down-hole rock drilling machine, characterised by a down-hole rock drilling machine (10), a carrier sleeve (22) journaled on the machine housing (11) to permit for the rotation of the machine in the carrier sleeve, a guiding element (30) fixed to and carried by the carrier sleeve laterally thereof and arranged to be guided by a predrilled borehole during a drilling operation, axial bearings (21,22; 23,24) for the carrier sleeve on the machine housing, and a machine part (13) for holding the axial bearings axially in place, said machine part (13) being fixed to the machine housing (11) by a thread connection subjected to the torque for rotating the machine during drilling.
2. An arrangement according to claim 1, characterised in that said machine part is a bit holder (13) which has a splined connection to the drill bit (13).
3. An arrangement according to claim 1 or 2, characterised in that the guiding element (30) is a tube plugged at its front end.
4. An arrangement according to any one of the preceding claims, characterised by an intermediate element (31) between the machine (10) and the guiding element (30), the front surface of the intermediate element having an angle to the machine housing of between 10 and 45 degrees.
PCT/SE1999/000244 1998-03-03 1999-02-23 An arrangement for drilling slots WO1999045237A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002322693A CA2322693C (en) 1998-03-03 1999-02-23 An arrangement for drilling slots
AU27532/99A AU2753299A (en) 1998-03-03 1999-02-23 An arrangement for drilling slots

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9800647A SE515810C2 (en) 1998-03-03 1998-03-03 Slot drilling device with a submersible drill
SE9800647-1 1998-03-03

Publications (1)

Publication Number Publication Date
WO1999045237A1 true WO1999045237A1 (en) 1999-09-10

Family

ID=20410369

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/000244 WO1999045237A1 (en) 1998-03-03 1999-02-23 An arrangement for drilling slots

Country Status (4)

Country Link
AU (1) AU2753299A (en)
CA (1) CA2322693C (en)
SE (1) SE515810C2 (en)
WO (1) WO1999045237A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009122001A1 (en) * 2008-04-03 2009-10-08 Sandvik Mining And Construction Oy Drilling unit, method for slot drilling and slotting device
KR101230482B1 (en) * 2010-10-18 2013-02-21 강릉건설 주식회사 The apparatus of rock excavation using the longest slot drill and the non-vibration rock excavating method using thereof
CN106869922A (en) * 2015-12-14 2017-06-20 刘素华 The flexible axle sleeve reciprocating impact portion of multistage shield sealing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071100A (en) * 1975-05-29 1978-01-31 Wibom Gustaf H O Method of making holes of selected external configuration in preferably rock or ground formation, and a drilling machine for carrying out the method
SE420435B (en) * 1979-11-19 1981-10-05 Skanska Cementgjuteriet Ab SET DRILL AND DEVICE
SE468953B (en) * 1989-03-17 1993-04-19 Herbert Sven Erik Broberg Method for drilling long holes in rock, and guide arrangement and sealing arrangement for this

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071100A (en) * 1975-05-29 1978-01-31 Wibom Gustaf H O Method of making holes of selected external configuration in preferably rock or ground formation, and a drilling machine for carrying out the method
SE420435B (en) * 1979-11-19 1981-10-05 Skanska Cementgjuteriet Ab SET DRILL AND DEVICE
SE468953B (en) * 1989-03-17 1993-04-19 Herbert Sven Erik Broberg Method for drilling long holes in rock, and guide arrangement and sealing arrangement for this

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009122001A1 (en) * 2008-04-03 2009-10-08 Sandvik Mining And Construction Oy Drilling unit, method for slot drilling and slotting device
AU2008353952B2 (en) * 2008-04-03 2011-11-24 Sandvik Mining And Construction Oy Drilling unit, method for slot drilling and slotting device
KR101230482B1 (en) * 2010-10-18 2013-02-21 강릉건설 주식회사 The apparatus of rock excavation using the longest slot drill and the non-vibration rock excavating method using thereof
CN106869922A (en) * 2015-12-14 2017-06-20 刘素华 The flexible axle sleeve reciprocating impact portion of multistage shield sealing

Also Published As

Publication number Publication date
SE515810C2 (en) 2001-10-15
AU2753299A (en) 1999-09-20
CA2322693C (en) 2006-12-19
CA2322693A1 (en) 1999-09-10
SE9800647D0 (en) 1998-03-03
SE9800647L (en) 1999-09-04

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