GB2106608A - Connection of drill rods - Google Patents

Connection of drill rods Download PDF

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Publication number
GB2106608A
GB2106608A GB08226876A GB8226876A GB2106608A GB 2106608 A GB2106608 A GB 2106608A GB 08226876 A GB08226876 A GB 08226876A GB 8226876 A GB8226876 A GB 8226876A GB 2106608 A GB2106608 A GB 2106608A
Authority
GB
United Kingdom
Prior art keywords
coupling
rod
drill rod
zone
recess
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
GB08226876A
Other versions
GB2106608B (en
Inventor
John Martin Holmberg
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 International Ltd
Original Assignee
Boart International 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 International Ltd filed Critical Boart International Ltd
Publication of GB2106608A publication Critical patent/GB2106608A/en
Application granted granted Critical
Publication of GB2106608B publication Critical patent/GB2106608B/en
Expired 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
    • E21B17/043—Threaded with locking means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/18—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements
    • F16B7/182—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements for coaxial connections of two rods or tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

A drill rod 12 is attached to a tubular coupling 10 in a positive fashion by providing at least one recess on the drill rod, for instance a flat 18 on the rod's surface, and the coupling is deformed in the zone 20 of the recess so that it enters the recess and prevents disconnection. <IMAGE>

Description

SPECIFICATION Connection of drill rods This invention relates to the connection of a length of drill rod to another component, using a tubular coupling. The other component may be another similar length of rod or may be a machine or other structure.
Drill strings of some length are frequently used in industries such as mining where site conditions are difficult and where speediness in operations such as joining two lengths of rod is desirable. In many such operations it is necessary at some stages to disconnect two lengths of rod, and with the conventional tubular coupling it is sometimes difficult to detect which rod has been withdrawn from the coupling.
This naturally leads to uncertaintyforthe operator.
There is also a danger of accidental uncoupling at anytime which presents certain hazards.
An object of the invention is to provide means by which a positive and permanent or semi-permanent connection can be made at one or both ends of a drill rod to a coupling so that the above-mentioned problems can be mitigated or overcome.
According to the invention, a method of securing a drill rod to a tubular coupling comprises forming a recess on a surface of the drill rod in a zone intended to be embraced by the coupling, inserting the drill rod into the coupling, and deforming the coupling in this zone so that a part of the coupling enters the recess to prevent disconnection ofthe drill rod from the coupling.
Preferably more than one recess is formed. Three recesses spaced apart around the periphery of the rod have been found suitable. The recesses may extend for only a short length along the rod or may extend through a threaded zone to the end of the rod. The deformed part of the coupling occupies at least a part of the recess.
The invention also includes the combination of such a rod and a coupling fixed on it and deformed as described.
Figure 1 is a longitudinally sectioned view through a tubular coupling fixed on to a drill rod by the method of the invention; Figure 2 is a cross-sectional view on the line ll-ll in Figure 1; Figure 3 is a perspective view of the end of a drill rod according to the invention, of the kind seen in Figure 1; and Figure 4 is a perspective view similar to Figure 3 of a different form of drill rod according to the invention.
In Figures 1-3, a tubular coupling 10 for a drill rod 12 has the customary internally threaded bore 14 into which a threaded end 16 of the rod is screwed.
As is best seen in Figure 3, the end of the rod 12 is formed with three flats 18 arranged at equal peripheral intervals and extending along the full length of the threaded zone and inward of it to define three similar recesses.
The threaded part 14 of the coupling 10 terminates at the left in Figure 1 in an unthreaded zone 20 which surrounds the recesses defined by the flats 18. Once the rod 12 is fully inserted into the coupling 10 the zone 20 of the coupling is compressed out of its general cylindrical shape on to the flats 18 and is thereby deformed as shown in Figures 1 and 2. This provides a positive and permanent or semi-permanent connection between the rod 12 and the coupling 10. A second rod (not illustrated) may then be screwed into the right-hand part of the coupling 10 as in Figure 1.
Figure 4 shows an alternative version in which the drill rod 50 has a conventional circular threaded end 52 and three flats 54 defining recesses are provided inward of the threaded zone and spaced around the periphery of the rod. The same coupling as in Figures 1 and 2 may be used to hold the threaded end of the rod, the end zone 20 the coupling again being compressed in the appropriate places to deform it into contact with the flats 54.
In place of the flats 18 or 54, grooves or other formations defining recesses may be used.
The deformed zone 20 of the coupling 10 has certain advantages when the assembly of the rod and coupling takes place in the factory and the assembly is stored in a magazine for automatic feed to a jumbo or other drilling machine, since the radially inwardly deformed parts of the zone 20 provide convenient lead-in surfaces when one assembly slides over another, preventing fouling between the coupling and the end of an adjacent coupling or other structure.
Voids in the coupling between its surface and that of the recesses in the rod can be filled with a substance (not illustrated) which sets to fill the voids and which prevents corrosion.
1. A method of securing a drill rod to a tubular coupling comprising forming a recess on a surface of the drill rod in a zone intended to be embraced by the coupling, inserting the drill rod into the coupling, and deforming the coupling in this zone so that a part of the coupling enters the recess to prevent disconnection of the drill rod from the coupling.
2. The method of claim 1 inwhichapluralityof recesses is provided, located around the periphery ofthe rod.
3. The method of claim 2 in which three recesses are provided.
4. The method of any of the above claims in which the or each recess comprises a flat.
5. The method of any of the above claims in which the drill rod has a threaded zone and the or each recess is provided at least partly in the threaded zone.
6. The method of any of claims 1 to 4 in which the drill rod is threaded in a zone at its end and the or each recess is provided inwardly of the threaded zone.
7. The method of any of the above claims including the step of inserting a settable material
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Connection of drill rods This invention relates to the connection of a length of drill rod to another component, using a tubular coupling. The other component may be another similar length of rod or may be a machine or other structure. Drill strings of some length are frequently used in industries such as mining where site conditions are difficult and where speediness in operations such as joining two lengths of rod is desirable. In many such operations it is necessary at some stages to disconnect two lengths of rod, and with the conventional tubular coupling it is sometimes difficult to detect which rod has been withdrawn from the coupling. This naturally leads to uncertaintyforthe operator. There is also a danger of accidental uncoupling at anytime which presents certain hazards. An object of the invention is to provide means by which a positive and permanent or semi-permanent connection can be made at one or both ends of a drill rod to a coupling so that the above-mentioned problems can be mitigated or overcome. According to the invention, a method of securing a drill rod to a tubular coupling comprises forming a recess on a surface of the drill rod in a zone intended to be embraced by the coupling, inserting the drill rod into the coupling, and deforming the coupling in this zone so that a part of the coupling enters the recess to prevent disconnection ofthe drill rod from the coupling. Preferably more than one recess is formed. Three recesses spaced apart around the periphery of the rod have been found suitable. The recesses may extend for only a short length along the rod or may extend through a threaded zone to the end of the rod. The deformed part of the coupling occupies at least a part of the recess. The invention also includes the combination of such a rod and a coupling fixed on it and deformed as described. Figure 1 is a longitudinally sectioned view through a tubular coupling fixed on to a drill rod by the method of the invention; Figure 2 is a cross-sectional view on the line ll-ll in Figure 1; Figure 3 is a perspective view of the end of a drill rod according to the invention, of the kind seen in Figure 1; and Figure 4 is a perspective view similar to Figure 3 of a different form of drill rod according to the invention. In Figures 1-3, a tubular coupling 10 for a drill rod 12 has the customary internally threaded bore 14 into which a threaded end 16 of the rod is screwed. As is best seen in Figure 3, the end of the rod 12 is formed with three flats 18 arranged at equal peripheral intervals and extending along the full length of the threaded zone and inward of it to define three similar recesses. The threaded part 14 of the coupling 10 terminates at the left in Figure 1 in an unthreaded zone 20 which surrounds the recesses defined by the flats 18. Once the rod 12 is fully inserted into the coupling 10 the zone 20 of the coupling is compressed out of its general cylindrical shape on to the flats 18 and is thereby deformed as shown in Figures 1 and 2. This provides a positive and permanent or semi-permanent connection between the rod 12 and the coupling 10. A second rod (not illustrated) may then be screwed into the right-hand part of the coupling 10 as in Figure 1. Figure 4 shows an alternative version in which the drill rod 50 has a conventional circular threaded end 52 and three flats 54 defining recesses are provided inward of the threaded zone and spaced around the periphery of the rod. The same coupling as in Figures 1 and 2 may be used to hold the threaded end of the rod, the end zone 20 the coupling again being compressed in the appropriate places to deform it into contact with the flats 54. In place of the flats 18 or 54, grooves or other formations defining recesses may be used. The deformed zone 20 of the coupling 10 has certain advantages when the assembly of the rod and coupling takes place in the factory and the assembly is stored in a magazine for automatic feed to a jumbo or other drilling machine, since the radially inwardly deformed parts of the zone 20 provide convenient lead-in surfaces when one assembly slides over another, preventing fouling between the coupling and the end of an adjacent coupling or other structure. Voids in the coupling between its surface and that of the recesses in the rod can be filled with a substance (not illustrated) which sets to fill the voids and which prevents corrosion. CLAIMS
1. A method of securing a drill rod to a tubular coupling comprising forming a recess on a surface of the drill rod in a zone intended to be embraced by the coupling, inserting the drill rod into the coupling, and deforming the coupling in this zone so that a part of the coupling enters the recess to prevent disconnection of the drill rod from the coupling.
2. The method of claim 1 inwhichapluralityof recesses is provided, located around the periphery ofthe rod.
3. The method of claim 2 in which three recesses are provided.
4. The method of any of the above claims in which the or each recess comprises a flat.
5. The method of any of the above claims in which the drill rod has a threaded zone and the or each recess is provided at least partly in the threaded zone.
6. The method of any of claims 1 to 4 in which the drill rod is threaded in a zone at its end and the or each recess is provided inwardly of the threaded zone.
7. The method of any of the above claims including the step of inserting a settable material into voids between the coupling and the drill rod and allowing it to set and fill such voids.
8. A drill rod attached to a tubular coupling, the coupling embracing a zone of the drill rod provided with at least one recess and a part of the coupling being deformed in this zone relatively to its general shape so that it occupies at least a part of the recess to prevent disconnection of the drill rod from the coupling.
9. The drill rod and tubular coupling of claim 8 in which the drill rod has a plurality of flats located about its periphery, the flats defining the recesses.
10. The drill rod and tubular coupling of claim 8 or claim 9 in which the drill rod has a threaded zone and the or each recess is provided at least partly in the threaded zone.
11. The drill rod and tubular coupling of claim 8 or claim 9 in which the drill rod has a threaded end zone and the or each recess is provided inwardly of the threaded zone.
12. A method of securing a drill rod to a tubular coupling, substantially as described in this specification and as illustrated in the drawings.
13. A drill rod attached to a tubular coupling, substantially as described in this specification and as illustrated in the drawings.
GB08226876A 1981-09-21 1982-09-21 Connection of drill rods Expired GB2106608B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA816535 1981-09-21

Publications (2)

Publication Number Publication Date
GB2106608A true GB2106608A (en) 1983-04-13
GB2106608B GB2106608B (en) 1984-09-12

Family

ID=25575662

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08226876A Expired GB2106608B (en) 1981-09-21 1982-09-21 Connection of drill rods

Country Status (2)

Country Link
AU (1) AU8857582A (en)
GB (1) GB2106608B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220165A2 (en) * 1985-10-21 1987-04-29 Bombardier-Rotax-Wien Produktions- und Vertriebsgesellschaft m.b.H. Method for securing a bolt, especially a stud, in a threaded hole of a work piece, bolt and tool for carrying out the method
EP0705391A4 (en) * 1993-03-25 1995-05-26 Nai Anchorlok Inc Spring brake actuator and caging bolt therefor
WO2009157846A1 (en) * 2008-06-25 2009-12-30 Sandvik Intellectual Property Ab A cuttable drilling tool, and a cuttable self drilling rock bolt
US11959340B2 (en) 2021-05-03 2024-04-16 Tracto-Technik Gmbh & Co. Kg Rod section of a ground drilling rod

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220165A2 (en) * 1985-10-21 1987-04-29 Bombardier-Rotax-Wien Produktions- und Vertriebsgesellschaft m.b.H. Method for securing a bolt, especially a stud, in a threaded hole of a work piece, bolt and tool for carrying out the method
EP0220165A3 (en) * 1985-10-21 1987-09-30 Bombardier-Rotax-Wien Produktions- und Vertriebsgesellschaft m.b.H. Method for securing a bolt, especially a stud, in a threaded hole of a work piece, bolt and tool for carrying out the method
EP0705391A4 (en) * 1993-03-25 1995-05-26 Nai Anchorlok Inc Spring brake actuator and caging bolt therefor
EP0705391A1 (en) * 1993-03-25 1996-04-10 Holland Neway International, Inc. Spring brake actuator and caging bolt therefor
WO2009157846A1 (en) * 2008-06-25 2009-12-30 Sandvik Intellectual Property Ab A cuttable drilling tool, and a cuttable self drilling rock bolt
AU2008230002B2 (en) * 2008-06-25 2012-05-03 Sandvik Intellectual Property Ab A cuttable drilling tool, and a cuttable self drilling rock bolt
US8556542B2 (en) 2008-06-25 2013-10-15 Sandvik Intellectual Property Ab Cuttable drilling tool, and a cuttable self drilling rock bolt
US11959340B2 (en) 2021-05-03 2024-04-16 Tracto-Technik Gmbh & Co. Kg Rod section of a ground drilling rod

Also Published As

Publication number Publication date
GB2106608B (en) 1984-09-12
AU8857582A (en) 1983-03-31

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Legal Events

Date Code Title Description
727 Application made for amendment of specification (sect. 27/1977)
727B Case decided by the comptroller ** specification amended (sect. 27/1977)
SPA Amended specification published
PCNP Patent ceased through non-payment of renewal fee