WO2023017481A1 - Raccord d'acier de forage, tige et maîtresse-tige les comprenant - Google Patents

Raccord d'acier de forage, tige et maîtresse-tige les comprenant Download PDF

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Publication number
WO2023017481A1
WO2023017481A1 PCT/IB2022/057552 IB2022057552W WO2023017481A1 WO 2023017481 A1 WO2023017481 A1 WO 2023017481A1 IB 2022057552 W IB2022057552 W IB 2022057552W WO 2023017481 A1 WO2023017481 A1 WO 2023017481A1
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WO
WIPO (PCT)
Prior art keywords
drill steel
formation
connecting formation
rod
shank
Prior art date
Application number
PCT/IB2022/057552
Other languages
English (en)
Inventor
Petrus Hendrik Roodt
Original Assignee
Gradidge, Robert Charles
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 Gradidge, Robert Charles filed Critical Gradidge, Robert Charles
Publication of WO2023017481A1 publication Critical patent/WO2023017481A1/fr

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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
    • E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches

Definitions

  • This invention relates to a drill steel coupling, a drill steel rod and a drill steel including such drill steel coupling and drill steel rod.
  • Percussion rock drilling is a well-known process in the mining industry and commonly used to drill blast holes or boreholes for rock bolts, for example.
  • the holes are generally drilled with the use of a drilling machine driving a drill steel.
  • the drill steel typically includes a shank adaptor at one end for engaging a chuck of the drilling machine and a drill bit connector at the other end for engaging a drill bit.
  • Most chucks for drilling machines used in the mining industry are shaped to receive a hexagonal shank adaptor.
  • a shank spans between the shank adaptor and the drill bit connector and generally has a collar located in the region of the shank adaptor. In use, the collar locates against the chuck of the drilling machine to limit the relative movement between the drill steel and the drilling machine.
  • the drill bit connector may be in the form of a screw thread or a tapered, fluted region for connection to a drill bit so as to allow the drill bit to be easily replaceable.
  • Coupling sleeves are typically used to connected more than one drill steel or drill steel segments to one another during the drilling process. These coupling sleeves are generally cylindrical in shape and carry sockets at their longitudinally spaced apart ends in which a portion of the drill steel or drill steel segment is received.
  • the sockets are shaped complementary to the ends of the drill steels or drill steel segments.
  • the sockets are typically shaped to receive a screw thread or tapered end of the drill steels or drill steel segments.
  • a drill steel rod including: a shank having first and second longitudinally opposite end portions; a first connecting formation carried by the first end portion; and a second connecting formation carried by the second end portion; wherein the first and second connecting formations are complementary shaped connecting formations such that the first connecting formation of one drill steel rod is connectable to a second connecting formation of another drill steel rod; wherein the first and second connecting formations comprise securing formations that engage one another when the first and second connecting formations of two drill steel rods are connected to one another to obstruct relative movement between the drill steel rods along their longitudinal centreline, i.e. the drilling direction, while allowing relative movement in a second direction transverse to the first direction to allow the drill steel rods to be connected to and disconnected from each other in use through relative rotation of less than one revolution.
  • the drill stee lord preferably includes a collar located on the shank between the first and second end portions such that a first portion extending between the first end portion and the collar defines a shank adaptor for engaging a drilling machine, wherein the shank adaptor has a substantially uniform polygonal outer profile along a major portion of its axial length.
  • the shank adaptor may have a substantially uniform polygonal outer profile from the first end region to the collar such that the substantially uniform polygonal outer profile extends along the first end portion carrying the first connecting formation.
  • the shank adaptor preferably has a hexagonal outer profile.
  • the securing formations are preferably operated between their secured and released configurations through angular rotation of about 60 degrees.
  • the securing formation of the first connecting formation may comprise a number of grooves and ridges running substantially parallel to one another, and wherein first, inner ends of the grooves and ridges are preferably offset relative to their second, outer ends.
  • the first, inner ends of the grooves and ridges are preferably offset from one another such that the second, outer end of each groove and ridge aligns with the first, inner end of an adjacent groove and ridge respectively.
  • a portion of the grooves and ridges between their first, inner ends and second, outer ends may be spirally shaped or twisted.
  • the spirally shaped or twisted portion of the grooves and ridges may be located between two substantially straight portions located at the first, inner ends and second, outer ends respectively.
  • the second connecting formation may comprise a socket defining a cavity in which the first connecting formation is receivable, and wherein the securing formation carried by the second connecting formation may comprise at least one projection projecting into the cavity defined by the socket.
  • the second connecting formation may comprise a number of projections that are equally spaced apart around the circumference of the socket.
  • the projections may be in the form of elements, such as balls, which hare received in holes located in a side wall of the socket, wherein the elements are located such that they extend into the socket.
  • the first end portion may be twisted, preferably by 60 degrees, relative to the remainder of the shank.
  • the first end portion may be twisted to create the spirally shaped or twisted portion of the first connection formation, i.e. the grooves and ridges.
  • a drill steel including at least one drill steel rod according to the first aspect of the invention and a starter rod, the starter rod including: a shank having first and second longitudinally opposite ends and a collar located on the shank between the first and second ends; a first portion extending between the first end and the collar, the first portion defining a shank adaptor for engaging a drilling machine; a second portion extending between the second end and the collar; a first connecting formation carried by the first portion; and a drill bit connecting formation carried by the second portion; wherein the first connecting formation of the starter rod is the same as the first connecting formation of the drill steel rod of the first aspect of the invention such that the first connecting formation of the starter rod is connectable to the second connecting formation of the drill steel rod.
  • a drill steel coupling including a first connecting formation carried by an end portion of a first drill steel segment, and a second connecting formation carried by an end portion of a second drill steel segment, wherein the first and second connecting formations are complementary shaped connecting formations such that the first connecting formation of one drill steel segment is connectable to a second connecting formation of another drill steel segment, and wherein the first and second connecting formations comprise securing formations that engage one another when the first and second connecting formations of two drill steel segments are connected to one another to obstruct relative movement between the drill steel segments along their longitudinal centreline, i.e. the drilling direction, while allowing relative movement in a second direction transverse to the first direction to allow the drill steel segments to be connected to and disconnected from each other in use through relative rotation of less than one revolution.
  • the securing formations may be operable between their secured and released configurations through angular rotation of about 60 degrees.
  • the securing formation of the first connecting formation may comprise a number of flutes, or grooves and ridges, running substantially parallel to one another, and wherein first, inner ends of the flutes, or grooves and ridges, are offset relative to their second, outer ends.
  • the first, inner ends of the grooves and ridges are preferably offset from one another such that the second, outer end of each groove and ridge aligns with the first, inner end of an adjacent groove and ridge respectively.
  • a portion of the grooves and ridges between their first, inner ends and second, outer ends may be spirally shaped or twisted.
  • the spirally shaped or twisted portion of the grooves and ridges is located between two substantially straight portions located at the first, inner ends and second, outer ends respectively.
  • the second connecting formation may comprise a socket defining a cavity in which the first connecting formation is receivable, and wherein the securing formation carried by the second connecting formation may comprise at least one projection projecting into the cavity defined by the socket.
  • the second connecting formation may include a number of projections that are equally spaced apart around the circumference of the socket.
  • the projections may be defined by elements, such as balls, which are received in holes located in a side wall of the socket, wherein the elements are located such that they extend into the socket.
  • the end portion of the first drill steel segment carrying the first connecting formation may be twisted, preferably by 60 degrees.
  • the end portion of the first drill steel segment carrying the first formation preferably has a substantially uniform polygonal, preferably hexagonal, outer profile along a major portion of its axial length.
  • a drill steel rod including: a shank having first and second longitudinally opposite ends and a collar located on the shank between the first and second ends; a first portion extending between the first end and the collar, the first portion defining a shank adaptor for engaging a drilling machine; a second portion extending between the second end and the collar; a first connecting formation carried by the first portion; and a second connecting formation carried by the second portion; wherein the first and second connecting formations are complementary shaped connecting formations such that the first connecting formation of one drill steel rod is connectable to a second connecting formation of another drill steel rod; wherein the first and second connecting formations define securing formations that engage one another when the first and second connecting formations of two adjacent drill steel rods are connected to one another such that the securing formations obstruct relative movement between the drill steel rods along the longitudinal centreline, i.e. the direction of travel of the drill steel rod in use, while allowing relative movement in a second, angular direction to
  • a drill steel coupling including: a male connecting formation being integrally formed with a first section of a drill steel, the male connecting formation being in the form of a deformed end of the first section of the drill steel; a female connecting formation integrally formed with a second section of the drill steel, the female portion being in the form of a socket carried by an end of the second section of the drill steel; wherein the male and female connecting formations carry complementary shaped securing formations that engage one another when the male and female connecting formations engage one another.
  • the male connecting formation may be in the form of a twisted portion of the first section of the drill steel.
  • the securing formation carried by the male connecting formation may be in the form of flutes, preferably spiral flutes.
  • the flutes are preferably created by twisting the first section of the drill steel.
  • the first section of the drill steel may have a polygonal cross-section, preferably a hexagonal cross-section.
  • the securing formation carried by the female connecting formations may be in the form of at least one projection projecting into a cavity defined by the socket.
  • the at least one projection may be pressed into the side wall of the socket.
  • the at least one projection may be created by deforming the side wall in a pressing process.
  • a method of creating a connecting formation of a drill steel rod including heating at least of portion of the drill steel rod, gripping an end of the drill steel rod and rotating the end relative to the remainder of the drill steel rod, thereby twisting the end of the drill steel rod to create the connecting formation.
  • Figure 1 shows a perspective view of an assembled drill steel in accordance with a first embodiment of the invention
  • Figure 2 shows a perspective view of the drill steel of Figure 1 in its disassembled state
  • Figure 3 shows a cross-sectional view of the drill steel of Figure 1 taken along its axial centreline
  • Figure 4 shows a perspective view of the drill steel coupling in accordance with the invention shown in a disassembled state
  • Figure 5 shows a perspective view of the drill steel coupling in accordance with the invention shown in an assembled state
  • Figure 6 shows an end view of a male connecting formation of the drill steel coupling of Figure 4.
  • Figure 7 shows an end view of a female connecting formation of the drill steel coupling of Figure 4.
  • Figure 8 shows a cross-sectional view of the drill steel coupling of Figure 4 in a disassembled state
  • Figure 9 shows a cross-sectional view of the drill steel coupling of Figure 5 in an assembled state
  • Figure 10 shows a perspective view of an assembled drill steel in accordance with a second embodiment of the invention.
  • Figure 11 shows a perspective view of the drill steel of Figure 10 in its disassembled state
  • Figure 12 shows an end view of the drill steel of Figure 10
  • Figure 13 shows a cross-sectional view of the drill steel of Figure 10 taken along A - A as shown in Figure 12;
  • Figure 14 shows a perspective view of an integrated or starter rod of the drill steel of Figure 10;
  • Figure 15 shows a front view of the integrated rod of Figure 14
  • Figure 16 shows an end view of the integrated rod of Figure 14
  • Figure 17 shows a cross-sectional view taken along B - B as shown in
  • Figure 18 shows a perspective view of an extension rod of the drill steel of Figure 10;
  • Figure 19 shows a front view of the extension rod of Figure 18
  • Figure 20 shows a right side view of the extension rod of Figure 18
  • Figure 21 shows an enlarged partial cross-sectional view taken along C
  • Figure 22 shows a cross-sectional view taken along D - D as shown in Figure 19;
  • Figure 23 shows a cross-sectional view taken along E - E as shown in Figure 19.
  • the terms “mounted”, “connected”, “engaged” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings and are thus intended to include direct connections between two members without any other members interposed therebetween and indirect connections between members in which one or more other members are interposed therebetween. Further, “connected” and “engaged” are not restricted to physical or mechanical connections or couplings. Additionally, the words “lower”, “upper”, “upward”, “down” and “downward” designate directions in the drawings to which reference is made. The terminology includes the words specifically mentioned above, derivatives thereof, and words or similar import.
  • a nonlimiting example of a drill steel including a drill steel coupling and drill steel rods in accordance with the invention is generally indicated by reference numeral 10.
  • the drill steel 10 is also referred to as a segmented drill steel in that it comprises different segments or drill steel rods that are connectable to one another.
  • the drill steel 10 includes a starter rod 20, and extension rod 30 and a taper rod 40.
  • the starter rod 20, extension rod 30 and taper rod 40 are connected to one another by means of couplings 50, also referred to as drill steel couplings.
  • the starter rod 20 engages a drill machine (not shown).
  • the starter rod 20 has a body 21 , which is also referred to as a shank or rod.
  • the body 21 has a polygonal shape in cross-section. In this illustrated embodiment the body 21 has a hexagonal shape in cross-section.
  • a first end portion 22 of the body 21 defines a shank adaptor, which is received in a complementary shaped socket of the drilling machine.
  • a collar 23, preferably a forged collar, is carried by the body 21 and defines the end of the shank adaptor 22.
  • a second end portion 24 of the body 21 extends from the collar 23 and terminates at a male connecting formation 25.
  • the male connecting formation 25 is integrally formed with the shank 21 of the starter rod 20.
  • the male connecting formation 25 is in the form of a twisted portion of the shank 21.
  • the male connecting formation 25 is created by heating the shank 21 of the starter rod 20, gripping its end 26 and twisting it through the desired degree of rotation.
  • the rounded end 26 could be used to seal against a rubber grommet in a female connecting formation 33 described below.
  • the end 26 of the shank 21 is rotated in an anticlockwise rotation to create the male connection portion 25.
  • the end 26 of the shank 21 may be rotated by between 10° and 80°, preferably 20° and 60°, particularly about 30°.
  • the starter rod 20 is connectable to either the extension rod 30 or taper rod 40.
  • the starter rod 20 is shown to connect to the extension rod 30.
  • the extension rod has a body 31 in the form of a rod or shank.
  • the shank 31 is again polygonal in cross-section, and in particular hexagonal.
  • a first end portion 32 of the shank 31 terminates in a female connecting formation 33 for connection to the male connecting formation 25 of the starter rod 20.
  • the female connecting formation 33 has a socket 34 defining an axial opening 35 for receiving the male connecting formation 25. Best seen in Figure 1 , the male connecting formation 25 of the starter rod 20 is received inside the socket 34 of the female connecting formation 33 carried by the extension rod 30.
  • the male 25 and female 33 connecting formations carry complementary shaped securing formations to secure the starter rod 20 and extension rod 30 together when the male and female connection formations engage one another.
  • the flutes 27 act as securing formations on the male connecting formation 25.
  • At least one projection 36 located on a side wall 37 of the socket 34 acts as the securing formation on the female connecting formation
  • the at least one projection 36 projects into a cavity defined by the socket
  • the female connecting formation 33 has two projections 36. These projections 36 are located diametrically opposite one another on the side wall 37 of the socket 34. In use, when the male 25 and female 33 connecting formations are connected to one another, the projections 36 engage the flutes 27. In particular, edges or ridges 28 of the flutes prevent linear relative movement between the flutes 27 and projections 36. In other words, the flutes 27 and projections 36 interact to prevent relative movement in an axial direction between the starter rod 20 and extension rod 30.
  • the projections 36 are illustrated as deformations in the side wall 37 of the socket 34. These deformations are formed in the side wall 37 through a pressing process or action. The deformations 36 are preferably formed in the side wall 37 through a cold forging pressing process. It should however be understood that the projections 36 could take various forms and are not limited to the projections 36 illustrated in the drawings. The projections 36 act as retaining elements that engage with the male connection formation 25. The invention is also not limited to two projections 36 and another embodiment could include two or more projections.
  • the extension rod 30 further includes a second end portion 38 terminating in a male connecting formation 39.
  • the male connecting formation 39 is identical to male connecting formation 25 carried by the starter rod 20.
  • the extension rod 30 is connectable to either another extension rod 30 or to the taper rod 40.
  • the extension rod 30 is shown to be connected to the taper rod 40.
  • the taper rod 40 has a body 41 in the form of a rod or shank.
  • the shank 41 is again polygonal in cross-section, and in particular hexagonal.
  • a first end portion 42 of the shank 41 terminates in a female connecting formation 43 for connection to the male connecting formation 25, 39 of either the starter rod 20 or extension rod 30.
  • the female connecting formation 43 is identical to the female connecting formation 33 and will accordingly not be described again.
  • the shank 41 of the taper rod has a second end portion 44 terminating in a drill bit connector 45 for engaging a drill bit.
  • the male connecting formation of one section of the drill steel such as the starter rod 20 or extension rod 30, is complementary shaped to the female connecting formation of another section of the drill steel, such as the extension rod 30 or taper rod 40.
  • a coupling 50 used in connecting two sections of the drill steel 10 to each other is shown in Figures 4 to 9.
  • the coupling 50 includes a male connecting formation 51 being integrally formed with a first section 52 of the drill steel and a female connecting formation 53 integrally formed with a second section 54 of the drill steel.
  • the male connecting formation 51 is identical to the male connecting formations 25, 39 described above while the female connecting formation 53 is identical to the female connecting formations 33, 43 described above.
  • the first section 52 of the drill steel 10 could be either a section 24 or 38 of the starter rod 20 or extension rod 30 respectively, and the second section 54 could be either the section 32 or 42 of the extension rod 30 or taper rod 40 respectively.
  • An advantage to the coupling 50 according to the invention is that the sections of the drill steel 10 can be quickly and securely connected to one another during the drilling process.
  • the coupling 50 of the invention addresses the problem associated with disengagement of the drill steel sections during drilling. It is therefore believed that the coupling 50 allows for a more efficient drilling operation due to less downtime connecting and disconnecting drill steel sections.
  • FIG. 10 to 23 another non-limiting example of a drill steel in accordance with the invention is generally indicated by reference numeral 210.
  • the drill steel 210 is again a segmented drill steel in that it comprises different segments or drill steel rods.
  • a central bore extends along the length of the drill steel 210 through which a coolant liquid is typically pumped, in use.
  • the drill steel 210 is similar to the drill steel 10 but, instead of including separate starter and taper rods, the drill steel 210 has a combined starter and taper rod 220.
  • This combined starter and taper rod 220 is also referred to as an integrated rod. Because this integrated rod 220 also engages the drilling machine (not shown) at the start of the drilling process, it is also referred to simply as a starter rod.
  • the drill steel 210 includes an extension rod 240.
  • the starter rod 220 and extension rod 240 are similarly connectable to one another by means of a coupling 260, also referred to as a drill steel coupling.
  • the starter rod 220 engages the drilling machine.
  • the starter rod 220 has a body 221 , which is also referred to as a shank or rod.
  • the body 221 has a polygonal shape in cross-section. Best seen in Figure 16, the body 221 has a hexagonal shape in cross-section.
  • a first end portion 222 of the body 221 defines a shank adaptor, which is receivable in a complementary shaped socket carried by the chuck of the drilling machine.
  • a collar 223 is carried by the body 221 and defines the end of the shank adaptor 222.
  • a second end portion 224 of the body 221 extends from the collar 223 and terminates in a drill bit connector 225 for engaging a drill bit (not shown).
  • the drill bit connector 225 is in the form of a tapered end that presses into a socket defined by the drill bit.
  • the first end portion 222 defining the shank adaptor also has a male connecting formation 226, which is integrally formed with the shank 221 of the starter rod 220.
  • the male connecting formation 226 is in the form of a twisted portion of the shank 221 .
  • the male connecting formation 226 is created by heating the shank 221 of the starter rod 220, gripping its end region 227 and twisting it through the desired degree of rotation.
  • the end 227 of the shank 221 is rotated in an anti-clockwise direction.
  • the end 227 of the shank 221 may be rotated by between 10° and 80°, preferably about 60°.
  • the first end portion 222 in particular the male connecting formation 226, includes locating formations.
  • the locating formations are illustrated as grooves 228 running between ridges 229.
  • the grooves 228 are typically machined into the first end portion 222 of the shank 221 after its end 227 is twisted. In other words, the end 227 is twisted to create flutes similar to those of the first embodiment of the invention.
  • the grooves 228 are then machined into the flutes generated through the twisting step. By following the paths generated by the twisted flutes, twisted or essentially spiral grooves 228 are formed in the end portion 222.
  • the first or outer ends 228.1 of the grooves 228 are therefore offset with respect to the second or outer ends 228.2 by the same degree of rotation of the end 227 of the shank 221 .
  • the ridges 229 are parallel to the grooves 228 and, accordingly, are offset as described above with reference to the grooves.
  • the end 227 of the shank 221 has a minor portion 230 in which the grooves 228 and ridges 229 are straight, i.e. untwisted.
  • This straight or untwisted portion 230 is as a result of the end 227 being gripped when twisting it to create the spiral profile of the male connecting formation 226.
  • the end 227 of the shank 221 is twisted such that the portions of the locating formations, particularly the grooves 228 and ridges 229, in the section 230 align with the portions of the locating formations in the untwisted section 231 .
  • a groove is formed in the centre of each of the six sides of the hexagonal body 221 to create the ridges on either side of it.
  • the grooves are indicated by the reference signs 228.1 to 228.6 and the ridges by the reference signs 229.1 to 229.6.
  • the portion of the groove 228.1 in the section 230 aligns with the portion of the groove 228.2 in the section 231 .
  • the angle a between each pair of grooves 228 or ridges 229, and accordingly the angular degree by which the shank 221 is twisted is 60 degrees. It should be understood that the degree of twisting is calculated by dividing 360 by n, where n is the number of sides of the polygonal outer profile.
  • the outer cross-sectional profile of the shank 221 in the section 230 is indicated by the broken lines 232. From this figure it can be seen that the shank adaptor 222 has the same hexagonal outer cross- sectional profile 232 than the shank 221 . As a result, the shank adaptor 222 is receivable in the chuck of the drilling machine despite carrying the male connecting formation 226. In the preferred embodiment, the outer profile of the shank 221 remains substantially consistent along the axial length of the shank, i.e. from the collar 223 to the end 227. In other words, the outer profile remains untwisted despite the twisted portion of the shank 221 carrying the connecting formation.
  • the consistent cross-sectional profile 232 is achieved by machining the shank 221 , particularly the shank adaptor 222, after twisting it to create the substantially flat or straight sides of the hexagonal shank through its length.
  • Figure 15 shows the shank 221 prior to being flattened.
  • the consistent hexagonal profile facilitates connection of the integrated rod 220 directly to the drilling machine while carrying the connecting formation 226 that allows for connection to the extension rod 240. Because the connecting formation 226 and hexagonal profile are integrally formed in the same portion on the shank 221 , the rod 220 can be connected directly to the drilling machine, thereby eliminating the need for separate starter and taper rods.
  • the extension rod 240 is substantially similar to the extension rod 30 of the first embodiment except that its male connecting formation is substantially identical to that of the integrated rod 220.
  • the extension rod 240 again has a body 241 in the form of a rod or shank.
  • the shank 241 is again polygonal in cross-section, and in particular hexagonal.
  • a first end portion 242 of the shank 241 terminates in a female connecting formation 243 for connection to the male connecting formation 262 of the integrated rod 220.
  • the female connecting formation 243 has a socket 244 defining an axial opening 245 for receiving the male connecting formation 226. Best seen in Figure 1 1 , the male connecting formation 226 of the integrated rod 220 is received inside the socket 244 of the female connecting formation 243 carried by the extension rod 240.
  • the male 226 and female 243 connecting formations carry complementary shaped securing formations to secure the integrated rod 220 and extension rod 240 to one another when the male and female connection formations engage one another.
  • the grooves 228 and ridged 229 act as securing formations on the male connecting formation 226.
  • At least one projection 246 located on a side wall 247 of the socket 34 acts as the securing formation on the female connecting formation 33.
  • the at least one projection 246 projects into a cavity defined by the socket 244.
  • the female connecting formation 243 has three projections 246. These projections 246 are located equidistantly around the circumference socket 244.
  • the projections 246 are spaced apart angularly at equal intervals around the socket 244.
  • the projections 246 engage the grooves 228 and ridges 229.
  • edges or ridges 229 of the male connecting formation 226 prevent linear relative movement between the flutes 228 and projections 246, and accordingly between the integrated rod 220 and the extension rod 240.
  • the grooves 228 and ridges 229 on the one section and the projections 246 on the other section interact to prevent relative movement in an axial direction between the starter rod 220 and extension rod 240.
  • the projections 246 are created by locating elements, such as steel balls for example, in holes located in the side wall 247 of the socket 244.
  • the holes are drilled into the side wall 247 at an angle p, which is typically around 30°.
  • the holes can be drilled at a substantially perpendicular angle through the side wall diametrically opposite from the location of the projection, preferably using a bullnose drill bit.
  • the elements are held captive in the holes such that they extend into the socket 244.
  • the portions of the elements extending into the socket 244 are received in the flutes 228 located on the male connecting formation 226.
  • alternative projections 246 could be used.
  • these projections 246 could again be formed as deformations like those of the first embodiment of the invention described above.
  • the projections 246 could take various forms provided that they act as retaining elements that engage with the male connection formation 226. It is also envisaged that more than three projections 246 could be used. For example, the number of projections 246 could match the number of sides to the shank 221 . Where a hexagonal shank 221 is used, it is envisaged that up to six projections 246 can be used.
  • the extension rod 240 further includes a second end portion 248 that is substantially similar to the portion 222 of the integrated rod 220.
  • the end portion 248 of the extension rod 240 therefore terminates in a male connecting formation 249, which is preferably identical to the male connecting formation 226 carried by the integrated rod 220.
  • the male connecting formation 249 will not be described again in detail. It should however be clear that the features described above in respect of the male connecting formation 226 apply equally to the male connecting formation 249.
  • the extension rod 240 carries a collar 250, which his similar to the collar 223 of the integrated rod 220.
  • the sections of the integrated 220 and extension rods 240 that are, in use, their back or lower ends are therefore substantially identical.
  • the back ends of both rods 220, 240 are therefore designed to engage the chuck of the drilling machine.
  • either the extension rod 240 or integrated rod 40 is connected to the drilling machine. It is envisaged that, at the start of the drilling process, the integrated rod 220 is connected to the drilling machine. Once the travel distance allowed by the integrated rod 220 has been used, it is disconnected from the drilling machine and the extension rod 240 is connected to the integrated rod 220 at one end and to the drilling machine at the other end.
  • extension rod 240 is disconnected from the drilling machine and another extension rod is connected to the existing extension rod at one end and the drilling machine at the other end. Any number of extension rods could be connected to one another to achieve the desired drilling depth or drill streel length.
  • the coupling 160 used in connecting two sections of the drill steel 210 to each other includes a male connecting formation 226; 249, which is integrally formed with a first section of the drill steel, and a female connecting formation 243, which is integrally formed with a second section of the drill steel.
  • the drill steel 210 essentially offers the same advantages of the drill steel 10 of the first embodiment.
  • the drill steel 210 allows for the integration of the starter rod and taper rod into a single, integrated started rod 220. This is possible due to the connecting formation and drilling machine engaging shank being integrally formed at the same end of the integrated rod 220 and extension rod 240 respectively.
  • the rods carrying the male connecting formations 226; 249 are twisted it is envisaged that in an alternative embodiment not shown in the drawings, the rods could be perform the same function without twisting their ends.
  • the securing formations such as the grooves and ridges, can be created in the ends of the rods without twisting them.
  • the drill steel coupling includes complementary shaped connecting formations carried by ends of drill steel rods.
  • the connecting formations are typically male 25; 226 and female 33; 243 to allow the male connecting formation to be received in the female connecting formation. Securing formations prevent relative axial movement between the rods while allowing for rotational movement.
  • the rods are connected to and disconnected from one another through rotational movement of less than one revolution, preferably 60 degrees.
  • the male connecting formation 226 preferably has a hexagonal outer profile so that it can be connected to either a female connecting formation 243 or directly to a drilling machine.

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  • Earth Drilling (AREA)

Abstract

La présente invention concerne une tige de forage, un raccord d'acier de forage permettant de raccorder des tiges d'acier de forage les unes aux autres et une maîtresse-tige comprenant ladite tige d'acier de forage et ledit raccord. Le raccord d'acier de forage comprend des formations de raccord de forme complémentaire solidaires des extrémités de tiges d'acier de forage. Les formations de raccord sont typiquement mâle et femelle afin de permettre à la formation de raccord mâle d'être logée dans la formation de raccord femelle. Des formations de fixation empêchent un mouvement axial relatif entre les tiges tout en permettant un mouvement de rotation. Les tiges sont raccordées les unes aux autres et désolidarisées les unes des autres par un mouvement de rotation inférieur à un tour. La formation de raccord mâle présente de préférence un profil externe hexagonal de façon à pouvoir être reliée soit à une formation de raccord femelle soit directement à une machine de forage.
PCT/IB2022/057552 2021-08-13 2022-08-12 Raccord d'acier de forage, tige et maîtresse-tige les comprenant WO2023017481A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118639965A (zh) * 2024-08-13 2024-09-13 煤炭科学技术研究院有限公司 一种钻杆连接装置

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GB668607A (en) * 1949-09-27 1952-03-19 Sandvikens Jernverks Ab Arrangement for attaching a drill crown to a drill steel or drill steels to each other
US20050183890A1 (en) * 2002-10-22 2005-08-25 Josef Mocivnik Device for connecting two elements having a substantially cylindrical or tubular shape
US20120205908A1 (en) * 2011-02-10 2012-08-16 Tracto-Technik Gmbh & Co., Kg Plug connection and pipe section for a drill pipe
US20190063504A1 (en) * 2017-08-25 2019-02-28 Kennametal Inc. Spline drive drill steel couplers
US20210001412A1 (en) * 2018-02-02 2021-01-07 J.H. Fletcher & Co. Quick-release coupling for drilling and related methods

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB668607A (en) * 1949-09-27 1952-03-19 Sandvikens Jernverks Ab Arrangement for attaching a drill crown to a drill steel or drill steels to each other
US20050183890A1 (en) * 2002-10-22 2005-08-25 Josef Mocivnik Device for connecting two elements having a substantially cylindrical or tubular shape
US20120205908A1 (en) * 2011-02-10 2012-08-16 Tracto-Technik Gmbh & Co., Kg Plug connection and pipe section for a drill pipe
US20190063504A1 (en) * 2017-08-25 2019-02-28 Kennametal Inc. Spline drive drill steel couplers
US20210001412A1 (en) * 2018-02-02 2021-01-07 J.H. Fletcher & Co. Quick-release coupling for drilling and related methods

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118639965A (zh) * 2024-08-13 2024-09-13 煤炭科学技术研究院有限公司 一种钻杆连接装置

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