AU2004243343C1 - Rockbolt - Google Patents
Rockbolt Download PDFInfo
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- AU2004243343C1 AU2004243343C1 AU2004243343A AU2004243343A AU2004243343C1 AU 2004243343 C1 AU2004243343 C1 AU 2004243343C1 AU 2004243343 A AU2004243343 A AU 2004243343A AU 2004243343 A AU2004243343 A AU 2004243343A AU 2004243343 C1 AU2004243343 C1 AU 2004243343C1
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- AU
- Australia
- Prior art keywords
- rock bolt
- shaft
- sleeve
- elongate member
- self drilling
- Prior art date
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Description
00 o ROCK BOLT cI Technical Field 00 The present invention relates to a drilling member and a rock bolt suitable for use in the mining and tunnelling industry.
C Background Art Roof and wall support is a crucial aspect of mining and tunnelling-operations.
Mine and tunnel walls and roofs consist of rock strata, which must be reinforced to prevent the possibility of collapse. Rock bolts are widely used for consolidating the rock strata. A rod is anchored and often tensioned in a hole drilled transversely through the 1o rock strata for this purpose. Typically, the bolt is secured using a resin or cement based grouting fluid, which is inserted around the rod and activated.
Self drilling rock bolts combine drilling and insertion of the bolt into the drilled hole. Self drilling rock bolts typically have a drilling tip attached to the end of a tubular 1314294-1:hxa 00 ,I steel member so that the hole is drilled and the bolt inserted simultaneously. A Sdisadvantage of self drilling rock bolts is that they are not commonly used in the mining 00
C
industry due to the high cost of the tubular steel that is used to provide both access to Cr' flushing and grouting fluids and the structural strength that is required to consolidate the r^ 5 rock.
The above discussion of background art is included to explain the context of the C present invention. It is not to be taken as an admission that any of the documents or other material referred to was published, known or part of the common general knowledge in Australia at the priority date of any one of the claims of this specification.
1314294-1:hxa 3 00 Object of the Invention It is the object of the present invention to overcome or substantially ameliorate the above disadvantage.
SSummary of the Invention 5 There is disclosed herein a self drilling rock bolt having opposite first and second Sends and a shaft extending between the ends; at least one drill tip disposed at the first end for drilling a hole, with the second end being adapted to be connected to a drilling apparatus to provide for rotation and thrust to be applied to the bolt; a sleeve extending along and around the shaft; a passage extending along the shaft; an anchoring device which is moveable from a retracted position in which the device does not impede drilling 1314294-1:hxa 00 of a hole to an expanded position in which the device is arranged to retain the bolt in a Sdrilled hole, whereby said passage provides for fluid flow along the shaft, and said shaft is 00 rotated in a first direction to effect drilling of a hole, and relative axial movement of said Cc sleeve relative to said shaft moves the anchoring device from its retracted position to its ¢c€ C 5 expanded position, to effect retention of the bolt in the hole.
SPreferably, said relative movement is movement towards said first end.
N, Preferably, said passage is located between said sleeve and shaft.
Preferably, said shaft has a longitudinal axis and the at least one drill tip extends radially relative to said axis a distance greater than the sleeve.
1314294-1 :hxa 00 -0 Preferably the at least one drill tip is fixed to said first end.
SPreferably, the self drilling rock bolt further comprising a drill bit incorporating 00 the at least one drill tip thereon.
Cr^ Preferably, the drill bit comprises a bit body having opposite body ends and a m 5 wall surface extending between the body ends, with the at least one drill tip located at one body end, and the bit being connected to the shaft at its other body end, wherein at least CI one channel extends from the wall surface of the drill bit to the at least one drill tip.
Preferably, the wall surface of the drill bit body includes a wall portion that tapers outwardly towards said one body end.
1314294-1 :hxa 00 C, Preferably, said sleeve has opposite longitudinal ends, with openings to the h. passage at or adjacent each of the opposite ends of the sleeve.
00
C
Preferably, the self drilling rock bolt further comprises a collar piece that extends Ccr about the shaft adjacent the shaft second end.
Preferably, the self drilling rock bolt further comprising at least one channel that allows fluid to flow through the collar piece into or out of said passage.
C Preferably, the at least one channel is formed between the shaft and the collar piece.
Preferably, the self drilling rock bolt according to any one of the preceding claims, further comprising at least one channel formed at the first end to facilitate flow of fluid between the passage and the drill tip.
1314294-1:hxa 00 -1 Preferably, at least part of the channel at the first end is located in the shaft.
SPreferably, the sleeve has substantially less compressive strength than the shaft.
00 Preferably, the shaft is formed from steel rod.
Cr^ Preferably, the shaft is formed from a fiber reinforced material.
Preferably, the sleeve is formed from plastic.
Preferably, the sleeve is formed from sheet metal.
CI Preferably, the shaft has a rough outer surface to promote bonding of grout to the shaft.
Preferably, the shaft has a longitudinal outer surface that is corrugated.
Preferably, the sleeve is deformable and when so deformed, the sleeve extends radially beyond the drill tip.
1314294-1:hxa 00 Preferably, the rock bolt further comprises at least one engaging surface, and Swherein the sleeve is deformed on relative movement of the sleeve across the engaging 00 1 surface.
M^ Preferably, the engaging surface is located on the drill bit.
,c' c 5 Preferably, the sleeve is deformable under axial compression.
Preferably, the sleeve incorporates at least one weakened area that facilitates (Ni deformation of the sleeve.
Preferably, the at least one weakened area is in the form of a slit formed in the sleeve.
Preferably, the anchoring device forms part of, or is connected to, the sleeve.
Preferably, the sleeve is formed from a composite structure and includes at least one metal member that forms said anchoring device.
1314294-1 :hxa 00 Preferably, the anchoring device is in the form of at least one expansion shell ,1 Sthat is displaceable radially outwardly.
00 00 Preferably, the rock bolt comprises at least one engaging surface, and wherein
(N
the at least one expansion shell becomes operative on relative movement of the engaging s surface across an inner surface of the at least one expansion shell.
Preferably, the sleeve is displaceable along the shaft in response to movement of Sthe collar piece along the shaft.
Preferably, the collar piece is connected to the shaft by an external thread on the shaft that engages with a complementary inner thread of the collar piece with rotation of said collar piece in an opposite direction to said first direction causing said movement of the collar piece.
Preferably, the rock bolt is adapted to be connected at least in part to the drilling apparatus by connection of the drilling apparatus with the collar piece.
1314294-1:hxa 00 Preferably, the collar piece limits the axial movement of the sleeve towards the oO o second end of the rock bolt.
00 Preferably, the self drilling rock bolt further comprising extension means arranged to extend the length of the rock bolt, the extension means comprising at least one extension shaft and at least one extension sleeve, wherein the or each extension shaft N, is operative to be connected adjacent said second end of the shaft of the rock bolt or to an Send of another said extension shaft, and the extension sleeve is operative to be connected to the sleeve of the rock bolt or to an end of another said extension sleeve.
Preferably, the extension shaft is connected to the second end of the shaft or to 1o another said extension shaft in a manner that allows the transmission of torque and thrust through the connection.
1314294-1:hxa 00 -i There is further disclosed herein a method of stabilising rock, comprising: n drilling a hole into the rock using a self drilling rock bolt having a shaft, a 00
C
drilling end, an opposite end connected to a drilling apparatus, a sleeve extending along Ccn and around the shaft, and an anchoring device for anchoring the bolt in a drilled hole, the Cc 5 shaft being rotated in a first direction to drill the hole; providing drilling fluid to the drilling end during drilling of the hole by conveying fluid along a surface of the shaft; anchoring the rock bolt in the hole via the anchoring device by causing relative longitudinal movement of the sleeve and the shaft; and 1314294-1:hxa 00 fixing the rock bolt within the hole to stabilise the rock.
SPreferably, said longitudinal movement is toward said drilling end.
00 Preferably, the shaft is placed in tension in the hole prior to introducing grout Cc, into the hole.
Preferably, the drilling fluid passes along an outer surface of the shaft in an inner passage defined between the shaft and sleeve.
CI Preferably, the method further comprises forming an outer passage between the sleeve and rock surrounding the hole during drilling of the hole, with drilling fluid caused to flow to the drilling end through one of either the inner or outer passages, and to be removed through the other of the passages.
Preferably, grout is introduced into the hole to fix the rock bolt to the rock.
Preferably, grout is caused to flow into each of the inner and outer passages.
1314294-1 :hxa 00
O
Brief Description of the Drawings Z A preferred form of the present invention will now be described by way of 00 example with reference to the accompanying drawings where: Figures la and Ib show a rock bolt of the invention.
cr 5 Figure 2 shows a rock bolt with expansion shells engaged.
O1, 1314294-1:hxa PCT/AU2004/000736 Received 18 April 2005 14 Figures 3a, b and c show an alternative rock bolt of the invention.
Figures 4a, b, c and d show a further alternative rock bolt of the invention.
Figures 5a, b and c show another alternative rock bolt of the invention.
Figures 6a, b, c and d show an alternative rock bolt of a fifth aspect of the invention.
Figures 7a, b and c show an alternative rock bolt of a sixth aspect of the invention.
Figures 8a, b and c show an alternative rock bolt of a seventh aspect of the invention.
Figures 9a and b show a drill of an eighth aspect of the invention.
Figures 10a, b and c show a further alternative rock bolt of the invention.
Figures lla, b and c show another alternative rock bolt of the invention Best and Other Methods of Carrying Out the Invention Figure la shows a rock bolt 10 of an embodiment of the invention comprising: a first elongate member, or shaft, 11 and a second elongate member, or sleeve, 12, wherein the first elongate member 11 is disposed at least partially, longitudinally inside the second elongate member 12, the first elongate member 11 comprising a first end 13, at a first end of the bolt 10, in the form of means, in the Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 present embodiment a drill bit, adapted to penetrate rock and a second end 14, at a second end of the bolt which is threaded with an external thread and provided with a collar piece 15 which has an internal, or complementary inner, thread adapted to provide attachment for actuating means by a hexagonal engaging region shown in Figure lb. The second elongate member 12 is adapted for transverse expansion along at least a portion of its length through provision of an anchoring device in the form of expansion shells 16.
In operation, as shown in Figure 2, the rock bolt of Figure 1 is drilled into the rock wall by attaching a drilling apparatus (not shown) to the internally threaded collar piece 15 and rotating threaded collar piece 15, first elongate member 11 and drill bit means 13. A channel, cavity, or passage, 17 between elongate members 11 and 12 can be provided, and used to transmit water or air while drilling to flush out drilling residue and reduce the temperature of the drill bit means 13. Following drilling and insertion of the rock bolt 10 into the rock internally threaded collar piece 15 is reverse rotated causing the internally threaded collar piece 15 to advance towards the first end 13 of the first elongate member 11 along the complementary external thread provided thereon.
Advancement of collar piece 15 by an axial force thereon forces collinear advancement towards the first end of second elongate member 12. Advancement of second elongate member 12 brings the anchoring device, in the present embodiment expansion shells 16, into engagement with a portion of first elongate member 11 of greater transverse dimension than the unexpanded transverse dimension of the expansion shells 16. The transverse force caused by this engagement causes deformation in the form of transverse expansion of the expansion shells 16 thereby wedging the rock bolt 10 in the hole drilled Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 16 by drill bit means 13. The anchoring device in the form of expansion shells 16 incorporates at least one weakened area in the form of a slit in the second elongate member 12. the second end 14 of first elongate member 11 may be adapted (by providing a pin such as a cotter or spring pin attached through the end of first elongate member 11 for example) so that threaded collar piece 15 cannot be removed.
Grout can also be injected into the channel, cavity, or passage 17 between the elongate members for additional reinforcement.
Figures 3a, b and c show a rock bolt 20 of an embodiment of the invention comprising a first elongate member, or shaft, 21 and a second elongate member, or sleeve, 22. The first end of the first elongate member 21 comprises, as rock penetrating means, or drill bit, an integral drill tip 23 in the form of a wedge cutting head, which extends radially from the bolt axis by a distance greater than that of the second elongate member. The second end of first elongate member 21 comprises an externally threaded portion 24 upon which is threaded internally, or complementary inner, threaded nut, or collar piece, 25. Second elongate member 22 is comprised of an elongate hollow tube 26 having a low strength wall and higher strength expansion shells, or anchoring device, 27 located at one end. The first ends of the first and second elongate members 21, 22 correspond to a first end of the bolt Figure 3a shows the first elongate member 21 separated from the second elongate member 22.
Figure 3b shows the rock bolt 20 drilling into a wall in a first rotational direction by means of drill tip 23 and a drill actuating means, or drilling Amended Sheet rPEAIAU PCT/AU2004/000736 Received 18 April 2005 17 apparatus, (not shown) acting on nut 25. The end of elongate member 21 is adapted (by providing a washer attached to the end of elongate member 21 for example) so that nut 25 cannot be removed. First elongate member 21 is disposed partially within elongate member 22 with drill tip 23 protruding above expansion shells 27.
Drill tip 23 is dimensioned to drill a hole large enough to receive both the first elongate member 21 and second elongate member 22. At the desired depth, nut 25 is tightened by turning the nut 25 in a second rotational direction. A washer, or abutment member, 28 extends beyond the hole drilled in the wall so that tightening nut 25 pushes washer 28 into abutment with second elongate member 22 and then urges expansion shells 27 of second elongate member 22 into abutment with drill tip 23. Washer 28 has an abutment surface that faces toward the first end of the bolt and projects radially from the bolt axis a distance greater than the drill tip 23.
Drill tip 23 has a splayed portion of larger external dimension than the internal dimension of expansion shells 27 so that as tightening nut 25 urges expansion shells 27 against drill tip 23, expansion shells 27 expand to accommodate drill tip 23, this expansion forcing expansion shells 27 into contact with the sides of the hole. Figure 3c shows rock bolt 20 at the end of this procedure with elongate hollow tube 26 having a low strength wall distorted, or deformed, by the axial force acting on the tube, and higher strength expansion shells 27 expanded into contact with the hole wall.
Figure 4a shows another rock bolt 30 of an embodiment of the invention. Rock bolt 30 comprises a first elongate member, or shaft, 31 and a second elongate member, or sleeve, 32. First elongate member, or shaft, 31 is disposed partially, longitudinally inside second elongate member 32. First elongate member 31 comprises a first end, which comprises an external Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 18 thread 33, and a second end 34 comprising a drive element, or attachment means, 35 shown in plan view in Figure 4b in the section taken along line C-C of Figure 4a. As shown in Figure 4b, drive element 35 is surrounded by access holes, or channels, 36. Second elongate member 32 comprises an anchoring device in the form of expansion shells 38 located at its second end 39. Rock penetrating means, or drill bit, in the form of drill tip 40 is internally threaded with a thread 41 that matches external thread 33 and comprises access holes 42 adjacent thread 41 and a central flushing hole 43 as shown in the cross sections of Figures 4c and 4d taken along lines A-A and B-B respectively. External thread 33 includes a transversely oriented plate member 45 at the first end of first elongate member 31 to prevent counter rotation of the drill tip 40. Drill tip comprises a tapered lower edge 44. Drill tip 40 is attached to the first end, via external thread 33.
Drill tip 40 protrudes beyond expansion shells 38 and is dimensioned to drill a hole of sufficient diameter to receive rock bolt 30. Flushing hole, or channel, 43 and access holes 36 and 42 allow influx and efflux of materials during drilling to assist the drilling process. Drilling is actuated by attachment of a drilling mechanism, or apparatus, to drive element When a hole of the required depth has been drilled, the drilling mechanism is counter-rotated, screwing external thread of first end 37 into thread 41 to urge drill tip against expansion shells 38 causing expansion shells 38 to expand. Plate member 45 stops any further relative rotation of the drill tip 40 to prevent first elongate member being rotated out of drill tip 40 during drilling.
Figure 5a shows a further rock bolt 50 of the invention. Rock bolt 50 comprises a first elongate member, or shaft, 51 and a second elongate member, or Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 19 sleeve, 52. First elongate member 51 is disposed partially, longitudinally inside second elongate member 52. First elongate member 51 comprises a first end 53, and a second end 54, which is adapted to a receive nut, or collar piece, 54a that can receive a drill actuating means, or drilling apparatus, (not shown). Second end 54 comprises transversely oriented plate member installed so that the nut 54a cannot be removed. First elongate member 51 also comprises longitudinal grooves 56. Rock penetrating means in the form of drill bit means 60 is adapted to be butt welded at end 61 to first end 53 of first elongate member 51. Drill bit means comprises a cutting head, or drill tip, 62 and an external thread 64 that matches internal thread inside tapered collar, or engaging surface, 63. The wider part of tapered collar 63 is disposed towards cutting head 62 and the narrower part towards end 61 and comprises access holes, or channels, 66. Further, tapered collar 63 of drill bit means 60, comprises channels 67 and an internal thread 65 as shown in the cross section of figure 5a taken along the line A-A.
Drill bit means 60 is butt-welded to end 53. Drill bit means 60 protrudes beyond end 57 of second elongate member 52. The lower edge of tapered collar 63 allows drill bit means 60 to pass inside second elongate member 52 until the width of tapered collar 63 matches the inner diameter of second elongate member 52. Drill bit means 60 is dimensioned to drill a hole of sufficient diameter to receive rock bolt 50. Grooves, or channels, 56 allow influx and efflux of materials during drilling to assist the drilling process. Drilling is actuated by attachment of the drilling apparatus to nut 54a. When a hole of the required depth has been drilled, the drilling apparatus is counter rotated to urge nut 54a against washer, or abutment member, 58 and washer 58 against the wall. Continued counter rotation of nut 54a urges the tapered collar 63 against end 57 of second Amended Sheet
IPEAIAU
PCT/AU2004/000736 Received 18 April 2005 elongate member 52 by pulling the first elongate member 51 back out of the wall while retaining the second elongate member in position, causing anchoring device, or end, 57 to expand into engagement with the hole wall.
Figure 6a shows a rock bolt 70 of a fifth embodiment of the invention. Where parts of the rock bolt correspond to those of the third aspect, the reference numerals of figure 5a have been used. The rock bolt 70 comprises: a first elongate member, or shaft, 71 and a second elongate member, or sleeve, 72.
First elongate member 71 is disposed partially, longitudinally inside second elongate member 72.
First elongate member 71 comprises a first end 73A, and a second end 73B, which is adapted to receive nut, or collar piece, 54a that can receive a drill actuating means (not shown). Second end 73B comprises a substantially shaped bore 55A to allow influx and efflux of materials during drilling to assist the drilling process. The first and second ends of the first and second elongate members 71, 72 correspond to first and second ends of the rock bolt 70. Nut 54a is welded to the first elongate member 71 so that the nut 54a cannot be removed and so that turning the nut 54a also turns the first elongate member 71. The first end 73A of first elongate member 71 comprises means 74 adapted to penetrate rock in the form of a drill bit.
Drill bit means 74 comprises a cutting head or drill tip and channels 76 to provide a return path for the flushing and grouting fluids, shown in the cross section of figure 6c taken along the line A-A. Drill bit 74 is suitably attached to the first end 73A of first elongate member 71 e.g. by brazing, butt-welding, forging or the like. Drill bit 74 protrudes beyond end 73C of second elongate member 72. Drill bit 74 is dimensioned to drill a hole of sufficient diameter to receive rock bolt Second elongate member 71 is corrugated, the Amended Sheet
LPEA/AU
PCT/AU2004/000736 Received 18 April 2005 21 corrugation providing stress transfer between the inner and outer surface of the second elongate member 71. The corrugations may be helical or radial and the depth of the corrugations is proportional to the radius of the second elongate member. Figure 6d shows the corrugations of second elongate member 72 in detail.
The second elongate member has corrugations on its inner and outer surface; the corrugation is defined by its peak 79a and trough 79b. The corrugations have sufficient amplitude so that the notional centre line in Figure 6d enters the regions of both the peak 79a and trough 79b.
Bolts according to any of the embodiments described above and below may also include the corrugated second elongate member.
Second elongate member 72 is suitably held in place e.g. by a tapered collar, or engaging surface, washer, or abutment member, or the like. Drilling is actuated by attachment of a drilling mechanism or apparatus [not shown] to nut 54a and rotating the first elongate member 71 and drill bit 74 in a first rotational direction.
Engagement of the drill bit means 74 with the rock requires the application of longitudinal (axial) pressure against the rock face in conjunction with the rotational action of the drilling apparatus. During drilling the drill bit 74 is cooled with a cooling agent, which is injected in a second cavity 78 between the rock face and second member 72. The cooling agent flows into and out of the second cavity 78 between the rock face and second member. When a hole of the required depth has been drilled, grouting fluid is injected into a first cavity, or passage, 77, which is annular, between the first and second member until the first cavity 77 is filled with grouting fluid. Grouting fluid may also be injected into the second cavity 78.
Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 22 The cooling fluid may also be injected into, or flow out of the first cavity. A circulation path between the first and second cavities may occur. The bolt 70 is then left to set in the grouting fluid. In general, such a T type channel in the first elongate member could be used in any embodiment of the invention shown. Such a channel is particularly used where a cotter pin is not used to secure the nut to the first elongate member.
Figure 7a shows a rock bolt 80 of an alternative version of the sixth embodiment of the invention. Where parts of the rock bolt correspond to those of the fifth and sixth aspects, the reference numerals of figures and 6a have been used. The rock bolt 80 comprises a first elongate member, or shaft, 81 and a second elongate member, or sleeve, 82. First elongate member 81 is disposed partially, longitudinally inside second elongate member 82. Preferably, the expandable end collar 87 is made of an elevated compressive strength material such as steel. First elongate member 81 comprises a first end 83A, and a second end 83B, which is adapted to receive nut, or collar piece, 54a that can receive a drill actuating means, or drilling apparatus (not shown). First end 83A of second elongate member 82 comprises an anchoring device in the form of an expandable end collar 87 to expand into contact with the sides of the drilled hole. Second end 83B comprises transversely oriented pin 55A such as a cotter or spring pin installed below nut 54a and through first elongate member 81 so that the nut 54a in one direction cannot be removed and so that turning the nut 54a also turns the first elongate member 81. First elongate member 81 also comprises access channels in the form of longitudinal grooves 56. The first end 83A of first elongate member 81 comprises drill bit means 84 adapted to penetrate rock.
Amended Sheet
IPEAIAU
PCT/AU2004/000736 Received 18 April 2005 23 Drill bit means 84 comprises a cutting head, or drill tip, 85 and tapered collar, or engaging surface, 86. The wider part of tapered collar 86 is disposed towards cutting head 85 and the narrower part towards end collar 87 and comprises access holes, or channels, 87A. Further, tapered collar 86 of drill bit means 84, comprises channels 90 of lesser radial extent that the rest of the tapered collar 86, to provide a return path for the flushing and grouting fluids, shown in the cross section of figure 7a taken along the line A-A. Drill bit means 84 is suitably attached to tapered collar 86 e.g. by brazing, butt welding forging or the like.
Tapered collar 86 protrudes beyond end 83C of second elongate member 82. The lower edge of the taper of collar 86 allows tapered collar 86 to pass inside second elongate member 82 until the width of collar 86 matches the inner diameter of second elongate member 82. Drill bit means 84 is dimensioned to drill a hole of sufficient diameter to receive rock bolt 80. Access channels in the form of grooves 56 allow influx and efflux of materials during drilling to assist the drilling process. Drilling is actuated by attachment of a drilling mechanism, or apparatus, [not shown] to nut, or collar piece, 54a and rotating the first elongate member 81 and drill bit means 84 in a first rotational direction. Engagement of the drill bit means 84 with the rock requires the application of longitudinal (axial) pressure against the rock face in conjunction with the rotational action of the drilling apparatus.
During drilling, the drill bit means 84 is cooled with a cooling agent, which is injected through access channels 56 at the second end 83B of the first elongate member 81. The cooling agent flows in a first cavity, or passage, 88 between the first and second member and flows out of the first cavity 88 through access channels 87A and a flushing hole 91 in the drill bit means 84 before being flushed back in a second cavity 89 between Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 24 the rock face and the second elongate member 82. When a hole of the required depth has been drilled, the drilling mechanism is counter rotated to urge nut 54a against washer 58 and washer 58 against the wall, washer 58 urges second elongate member 82 against tapered collar 86. Alternatively, the drilling mechanism is further rotated to urge nut 54a against washer 58 and washer 58 against the wall, washer 58 urges second elongate member 82 against tapered collar 86. Following drilling and insertion of the rock bolt into the rock, grouting fluid is injected through access channels 56 at the second end 83B of the first elongate member 81. The grouting fluid flows in a first cavity, or passage, 88 between the first and second member and flows out of the first cavity 88 through access channels 87A and flushing hole 91 in the drill bit means 84 before being flushed back towards washer 58 in a second cavity 89 between the rock face and the second elongate member 82. The grouting fluid is injected until both cavities 88, 89 are filled with grouting fluid and the bolt 80 is then left to set in the grouting fluid. Once the grouting fluid has set, the rock bolt can be optionally tensioned using the internally threaded collar.
Figures 8a, b and c show a rock bolt 20 of a seventh embodiment of the invention. Where parts of the rock bolt correspond to those of the second aspect, the reference numerals of figure 3 have been used. The rock bolt 20 comprising a first elongate member, or shaft, 21 and a second elongate member, or sleeve, 22. The first end of the first elongate member 21 comprises, as rock penetrating means, an integral drill tip 23 in the form of a wedge cutting head. The second end of first elongate member 21 comprises an externally threaded portion 24 upon which is threaded internally, or complimentary inner, threaded collar piece 25. Second elongate member 22 is comprised of an elongate hollow Amended Sheet
IPEAAU
PCT/AU2004/000736 Received 18 April 2005 tube 26 having a low strength wall and higher strength end collar, or anchoring device, 99 located at one end.
Figure 8a shows the first elongate member 21 separated from the second elongate member 22.
Figure 8b shows the rock bolt 20 drilling into a wall in a first rotational direction by means of drill tip 23 and a drill actuating means (not shown) acting on attachment means provided by collar piece 25. The end of elongate member 21 is adapted (by providing a plate member attached to the end of elongate member 21 for example) so that collar piece 25 cannot be removed.
First elongate member 21 is disposed partially within elongate member 22 with drill tip 23 protruding above end collar 99. Drill tip 23 is dimensioned to drill a hole large enough to receive both the first elongate member 21 and second elongate member 22. At the desired depth, collar piece 25 is tightened. Washer, or abutment member, 28 extends beyond the hole drilled in the wall so that tightening collar piece 25 pushes washer 28 into abutment with second elongate member 22 and then second elongate member 22 into abutment with end collar 99. Drill tip 23 has a splayed portion of larger external dimension than the internal dimension of end collar 99 so that as tightening collar piece urges second elongate member 22 against end collar 99, second elongate member 22 buckles, or deforms, because of the axial force applied to it in the direction of the first end of the first elongate member 21, forcing itself into contact with the sides of the drilled hole.
Figure 8c shows rock bolt 20 at the end of this procedure with elongate hollow tube 26 having a low strength wall distorted by the force acting on the tube and making contact with the hole wall. Following drilling and insertion of the rock bolt 20 into the rock, grouting fluid is injected through access channels Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 26 92 at the second end 96 of the first elongate member 21.
The grouting fluid flows in a first cavity, or passage, 97 between the first and second member and flows out of the first cavity 97 through access channels 93 and flushing hole, or channel, 94 in the drill tip 23 before being flushed back towards washer, or abutment member, 28 in a second cavity 98 between the rock face and the second elongate member 22. The grouting fluid is injected until both cavities 97, 98 are filled with grouting fluid and the bolt 20 is then left to set in the grouting fluid.
Figure 9a shows a drill 100 of an eighth embodiment of the invention comprising a first elongate member, or shaft, 101 and a second elongate member, or sleeve, 102.
First elongate member 101 is disposed partially, longitudinally inside second elongate member 102, which has first and second ends, 103C, 103D. First elongate member 101 comprises a first end 103A, and a second end 103B comprising as attachment means a drive element 104 that can receive a drill actuating means e.g. a drilling apparatus (not shown). Turning the drive element 104 also turns the first elongate member 101. Second end 103B of first elongate member 101 further comprises external thread 105. The first end 103A of first elongate member 101 comprises drill bit means 106 adapted to penetrate rock. Alternatively, the first end 103A may be adapted to receive a drill bit means to penetrate rock. Drill bit means 106 comprises a cutting head, or drill tip, 107 and central flushing hole 109.
Drill bit means 106 comprises channels 108 to provide a return path for the flushing and grouting fluids, shown in the cross section of figure 9a taken along the line A-A. Drill bit means 106 is suitably attached to first elongate member 101 e.g. by brazing, butt welding, forging or the like.
Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 27 Drilling is actuated by attachment of a drilling mechanism [not shown] to drive element 104 and rotating the first elongate member 101 and drill bit means 106 in a first rotational direction. Engagement of the drill bit means 106 with the rock requires the application of longitudinal pressure against the rock face in conjunction with the rotational action of the drilling apparatus. During drilling the drill bit means 106 is cooled with a cooling agent, which is injected in a first cavity, or passage, 110A between the first and second members 101, 102. The cooling agent flows into first cavity 110A, through central flushing hole, or channel, 109, past channels 108 and out second cavity 110B between the rock face and second member.
Alternatively, the direction of flow can be reversed.
When a hole of the required depth has been drilled, the drilling mechanism is removed from the hole and the hole can be used for example to insert explosives or reinforcement cables. The drill 100 can then be used to drill a further hole, the drill bit means 106 can be replaced by a further drill bit means 106 if required, e.g. for replacement of a worn cutting head, or drill tip, 107 or for different drilling conditions.
Figure 10a shows a rock bolt 111 of a further embodiment of the invention comprising a first elongate member, or shaft, 112 and a second elongate member, or sleeve, 113. First elongate member 112 is disposed partially, longitudinally inside second elongate member 113, which has first and second ends, 114C, 114D.
First elongate member 112 comprises a first end 114A, and a second end 114B comprising, as attachment means, a drive element 115 that can receive a drill actuating means e.g. a drilling apparatus (not shown). Turning the drive element 115 also turns the first elongate member 112. Second end 114B of first elongate member 112 further comprises an external thread 116 to Amended Sheet
IPEAIAU
PCT/AU2004/000736 Received 18 April 2005 28 rotatably lock internal thread 122 of first end 121A of third elongate member 112B as shown in figure 10b. The first end 114A of first elongate member 112 comprises drill bit means 117 adapted to penetrate rock.
Alternatively, the first end 114A may be adapted to receive a drill bit means to penetrate rock. Drill bit means 117 comprises a cutting head, or drill tip, 118.
Drill bit means 117 comprises channels 119 to provide a return path for the flushing and grouting fluids, shown in the cross section of figure 10a taken along the line A-A. Drill bit means 117 is suitably attached to the first elongate member 112 e.g. by brazing, butt welding forging or the like. Alternatively, the first end 114A may be adapted to receive a drill bit means to penetrate rock. Drill bit means 117 is dimensioned to drill a hole of sufficient diameter to receive rock bolt 111.
Figure 10b shows an extension rod 120 comprising a third elongate member 112B and a fourth elongate member 113B. Third elongate member 112B is disposed partially, longitudinally inside fourth elongate member 113B.
First end 121C of fourth elongate member 113B comprises a profiled lip adapted to be locked to the second end 114D of second elongate member 113 in figure Further, second end 121D of fourth elongate member 113B comprises a profiled lip adapted to be locked to a first end of sixth elongate member [not shown]. Third elongate member 112B comprises a first end 121A, and a second end 121B, comprising as attachment means a drive element 123 that can receive drill actuating means (not shown). Turning the drive element 123 also turns the third elongate member 112B. First end 121A of third elongate member 112B comprises internal thread 122 to engage and rotatably lock with the external thread 116 of figure 10a in a first rotational direction. The third elongate member 112B is locked to the first elongate member 112 such that rotation of the third Amended Sheet
IPEAIAU
PCT/AU2004/000736 Received 18 April 2005 29 elongate member 112B in the first rotational direction causes the same rotation of the first elongate member 112. In this way, rotation of the third elongate member in the first rotational direction rotates the drill bit and causes drilling to occur. Second end 121B of third elongate member 112B comprises an external thread 124 to rotatably lock internal thread of the first end of a fifth elongate member [not shown] in the same way as the locking between the first and third elongate members.
Figure ila shows an alternative rock bolt 130 of the previous embodiment of the invention. Rock bolt 130 comprises a first elongate member, or shaft, 131 and a second elongate member, or sleeve ,132. First elongate member 131 is disposed partially, longitudinally inside second elongate member 132. Second elongate member 132 comprises a first end 133C and a second end 133D. The first ends of the first and second elongate members 131, 132 correspond to the first end of the rock bolt 130.
The second elongate member 132 is adapted for deformation in the form of transverse expansion along at least a portion of its length through provision of expansion shells, or an anchoring device, 136A. First elongate member 131 comprises a first end 133A, and a second end 133B that is adapted to receive drive element 134 that can receive a drill actuating means (not shown). Second end 133B of first elongate member 131 is further adapted to receive a nut, or collar piece, [not shown]. Turning the drive element 134 also turns the first elongate member 131. Second end 133B of first elongate member 131 as attachment means further comprises an external thread 135 to rotatably lock internal thread 147 of first end 143A of a third elongate member 131B, shown in figure llb, when third elongate member 131B is turned in a first direction.
The first end 133A of first elongate member 131 comprises drill bit means 137 adapted to penetrate rock.
Amended Sheet
IPEAIAU
PCT/AU2004/000736 Received 18 April 2005 Alternatively, the first end 133A may be adapted to receive a drill bit means to penetrate rock. Drill bit means 137 comprises a cutting head, or drill tip, 138 and a tapered collar, or engaging surface, 136. The wider part of tapered collar 136 is disposed towards cutting head 138 and the narrower part towards first end 133C of second elongate member 132. Further, tapered collar 136 of drill bit means 137 comprises channels 139 to provide a return path for the flushing and grouting fluids, shown in the cross section of figure lla taken along the line A-A. Drill bit means 137 is suitably attached first elongate member 131 e.g. by brazing, butt welding forging or the like. Alternatively, the first end 133A may be adapted to receive a drill bit means to penetrate rock. Drill bit means 137 protrudes beyond end 133C of second elongate member 132. The lower edge of the tapered collar 136 allows drill bit means 137 to pass inside second elongate member 132 until the width of tapered collar 136 matches the inner diameter of second. elongate member 132. Drill bit means 137 is dimensioned to drill a hole of sufficient diameter to receive rock bolt 130.
Figure llb shows an extension rod 140 comprising a third elongate member 131B and a fourth elongate member 132B. Third elongate member 131B is disposed partially, longitudinally inside fourth elongate member 132B.
First end 143C of fourth elongate member 132B comprises a profiled lip adapted to be locked to the second end 133D of second elongate member, or sleeve, 132 in figure lla. Further, second end 143D of fourth elongate member 132B comprises a profiled lip adapted to be locked to a first end of sixth elongate member [not shown]. Third elongate member 131B comprises a first end 143A, and a second end 143B, comprising as attachment means a drive element 144 that can receive drill actuating means [not shown]. Second end 143B of third elongate member 131B Amended Sheet
LPEA/AU
PCT/AU2004/000736 Received 18 April 2005 31 is further adapted to receive the nut, or collar piece, 145. Turning the drive element 144 also turns the third elongate member 131B. First end 143A of third elongate member 131B comprises internal thread 147 to engage and rotatably lock with the external thread 135 of figure lla as described above. The third elongate member 131B is locked to the first elongate member 131 such that rotation of the third elongate member 131B in the first direction causes the same rotation of the first elongate member 131. In this way, rotation of the third elongate member in the first direction rotates the drill bit means and causes drilling to occur. Second end 143B of third elongate member 131B comprises an external thread 146 to rotatably lock internal thread of a fifth elongate member [not shown] It will be appreciated that further extensions can be inserted in the same manner as described above, by connection of further extension rods. Each extension rod is preferably adapted so that it can receive a further identical extension rod at either, or each end, and function as described above to drill deeper boltholes. Additionally, it is possible to use only a single extension rod, to achieve a shallower bolthole.
The rock bolt of an embodiment of the invention comprises the combination of first and second elongate members, together with one or more extensions, as described above.
Bolts according to any of the previous embodiments may be combined with extension rods as described above.
Drilling is actuated by attachment of a drilling mechanism, or apparatus, [not shown] to attachment means, or collar piece, provided by drive element 115 of figure 10a and rotating the first elongate member 112 and drill bit means 117 in a first rotational direction.
Amended Sheet
IPEA/AU
PCT/AU2004/0007 3 6 Received 18 April 2005 32 Engagement of the drill bit means 117 with the rock requires the application of longitudinal (axial) pressure against the rock face in conjunction with the rotational action of the drilling apparatus. During drilling the drill bit means 117 is cooled with a cooling agent, which is injected in a second cavity 110B between the rock face and second member 113. The cooling agent then returns by flowing into and out of a first cavity, or passage, 110A between the first elongate member 112 and second elongate member 113.
Alternatively, the cooling agent may be injected into the first cavity 110A between the first elongate member 112 and second elongate member 113 and return via the second cavity 110B between the rock face and second elongate member 113.
The length of the bolt is extended using the extension rod 120 of figure 10b to extend the rock bolt 111. The extension rod 120 is attached to the second end 114B of first elongate member 112 by drilling.
Drilling is actuated by attachment of a drilling mechanism, or apparatus, [not shown] to attachment means provided by drive element 123 of the extension rod 120 and rotating the third elongate member 112B in a first rotational direction. The first end 121C of the fourth elongate member 113B is then fitted to the second end 114D of the second elongate member 113 by attachment means such as a snap fitting.
The depth of the hole is then extended by attachment of the drilling mechanism [not shown] to attachment means provided by drive element 123 which rotates now joined first and third elongate members 112, 112B and drill bit means 119 in a first rotational direction. During drilling the drill bit means 119 is cooled with a cooling agent, which is injected in the Amended Sheet
IPEA/AU
PCT/AU2004/000736 Received 18 April 2005 33 second cavity 110A which now extends between the rock face and the first and third elongate members 112, 112B.
The cooling agent flows into and out of the first and second cavities 110A, 110B between the rock face and the first, and second, and third and fourth members 112, 112B, 113, 113B.
When a hole of the required depth has been drilled, grouting fluid is injected into the first cavity 110A between the joined first and third elongate members 112, 112B and the joined second and fourth elongate members 113, 113B until the cavity 110A is filled with grouting fluid. Grouting fluid may also be injected into the second cavity 78 between the rock face and the joined second and fourth elongate members. The extended bolt ill, 120 is then left to set in the grouting fluid. A circulation path may be formed, with grout being passed into one of the first and second cavities 110A, 78 and passing into the other in the region of the first end of the first elongate member and filling both cavities.
The extendible bolt of Figure 11 is drilled in the same way as described with reference to Figure 10 except that, when a hole of the required depth has been drilled, nut, or collar piece, 145 is rotated on external thread 146 of third elongate member 131B causing the nut 145 to advance towards the first end 143A of the third elongate member 131B and advance fourth elongate member 132B (and therefore second attached elongate member 132). Continued rotation of nut 145 urges the taper of collar 136 against first end 133C of second elongate member, or sleeve, 132 causing expansion shells 136A to expand into engagement with the hole wall.
It will be appreciated that further extensions can be inserted in the same manner as described above, by Amended Sheet
IPEA/AU
PCT/AU2004/00073 6 Received 18 April 2005 34 connection of further extension rods. Each extension rod is preferably adapted so that it can receive a further identical extension rod at either, or each end, and function as described above to drill deeper boltholes. Additionally, it is possible to use only a single extension rod, to achieve a shallower bolthole.
It will be appreciated that it is possible to use only the single rock bolt 130 of Figure lla, to achieve a shallower bolthole. The nut 145 [not shown in Figure lla] is attached to the external thread 135 of the first elongate member 131. Nut 145 is rotated on external thread 135 of first elongate member 131 causing the nut 145 to advance towards the first end 133A of the first elongate member 131 and advance second elongate member 132. Continued rotation of nut 145 urges the taper of collar 136 against first end 133C of second elongate member 132 causing expansion shells 136A to expand into engagement with the hole wall.
It will be appreciated that various alterations and/or additions in the particular construction and arrangement of parts previously described may be made without departing from the spirit or ambit of the present invention.
Amended Sheet
IPEAIAU
Claims (9)
- 2. The self drilling rock bolt of claim 1 wherein said relative movement is movement towards said first end.
- 3. The self drilling rock bolt of claim 2, wherein said passage is located between said sleeve and shaft.
- 4. A self drilling rock bolt according to claim 2 or 3, wherein said shaft has a longitudinal axis and the at least one drill tip extends radially relative to said axis a distance greater than the sleeve.
- 5. A self drilling rock bolt according to any one of claims 1 to 4, wherein the at least one drill tip is fixed to said first end.
- 6. A self drilling rock bolt of claim 5, further comprising a drill bit incorporating the at least one drill tip thereon.
- 7. A self drilling rock bolt according to claim 6, wherein the drill bit comprises a bit body having opposite body ends and a wall surface extending between the body ends, with the at least one drill tip located at one body end, and the bit being connected to the shaft at its other body end, wherein at least one channel extends from the wall surface of the drill bit to the at least one drill tip.
- 8. A self drilling rock bolt according to claim 7, wherein the wall surface of the drill bit body includes a wall portion that tapers outwardly towards said one body end.
- 9. A self drilling rock bolt according to any one of the preceding claims, wherein said sleeve has opposite longitudinal ends, with openings to the passage at or adjacent each of the opposite ends of the sleeve.
- 1331231-1:hxa:KEH 00 36 C 10. A self drilling rock bolt according to any one of the preceding claims, O further comprising a collar piece that extends about the shaft adjacent the shaft second end. C€3 11. A self drilling rock bolt according to claim 10, further comprising at least one channel that allows fluid to flow through the collar piece into or out of said C€3 passage. 12. A self drilling rock bolt according to claim 11, wherein the at least one Schannel is formed between the shaft and the collar piece. 13. A self drilling rock bolt according to any one of the preceding claims, N o further comprising at least one channel formed at the first end to facilitate flow of fluid between the passage and the drill tip. 14. A self drilling rock bolt according to claim 13, wherein at least part of the channel at the first end is located in the shaft. A self drilling rock bolt of any one of claims 1 to 14, wherein the sleeve Is has substantially less compressive strength than the shaft. 16. A self drilling rock bolt according to claim 15, wherein the shaft is formed from steel rod. 17. A self drilling rock bolt according to claim 15, wherein the shaft is formed from a fiber reinforced material. 18. A self drilling rock bolt according to any one of claims 1 to 17, wherein the sleeve is formed from plastic. 19. A self drilling rock bolt according to any one of claims 1 to 17, wherein the sleeve is formed from sheet metal. A self drilling rock bolt according to any one of the preceding claims, wherein the shaft has a rough outer surface to promote bonding of grout to the shaft. 21. A self drilling rock bolt according to any one of claims 1 to 19, wherein the shaft has a longitudinal outer surface that is corrugated. 22. A self drilling rock bolt according to any one of the preceding claims, wherein the sleeve is deformable and when so deformed, the sleeve extends radially beyond the drill tip. 23. A self drilling rock bolt according to claim 22, wherein the rock bolt further comprises at least one engaging surface, and wherein the sleeve is deformed on relative movement of the sleeve across the engaging surface. 1331231-1:hxa:KEH 00 37 24. A self drilling rock bolt according to claim 23, when dependent on Sclaim 6, wherein the engaging surface is located on the drill bit. C 25. A self drilling rock bolt according to any one of claims 1 to 24, wherein 00 Sthe sleeve is deformable under axial compression. 26. A self drilling rock bolt according to any one of claims 22 to e¢3 wherein the sleeve incorporates at least one weakened area that facilitates deformation of Cc the sleeve. 27. A self drilling rock bolt according to claim 26, wherein the at least one weakened area is in the form of a slit formed in the sleeve. 28. A self drilling rock bolt according to any one of the preceding claims, wherein the anchoring device forms part of, or is connected to, the sleeve. 29. A self drilling rock bolt according to claim 28, wherein the sleeve is formed from a composite structure and includes at least one metal member that forms said anchoring device. 30. A self drilling rock bolt according to any one of the preceding claims, wherein the anchoring device is in the form of at least one expansion shell that is displaceable radially outwardly. 31. A self drilling rock bolt according to claim 30, wherein the rock bolt comprises at least one engaging surface, and wherein the at least one expansion shell becomes operative on relative movement of the engaging surface across an inner surface of the at least one expansion shell. 32. A self drilling rock bolt according to any one of claims 11 to 31 when dependent on claim 10, wherein the sleeve is displaceable along the shaft in response to movement of the collar piece along the shaft. 33. A self drilling rock bolt according to claim 32, wherein the collar piece is connected to the shaft by an external thread on the shaft that engages with a complementary inner thread of the collar piece with rotation of said collar piece in an opposite direction to said first direction causing said movement of the collar piece. 34. A self drilling rock bolt according to claim 32 or 33, wherein the rock bolt is adapted to be connected at least in part to the drilling apparatus by connection of the drilling apparatus with the collar piece. A self drilling rock bolt according to claim 32, 33 or 34, wherein the collar piece limits the axial movement of the sleeve towards the second end of the rock bolt. 1331231-1:hxa:KEH 00 38 N 36. A self drilling rock bolt according to any one of the preceding claims, 0 further comprising extension means arranged to extend the length of the rock bolt, the extension means comprising at least one extension shaft and at least one extension sleeve, ¢€3 Swherein the or each extension shaft is operative to be connected adjacent said second end s of the shaft of the rock bolt or to an end of another said extension shaft, and the extension ¢€3 sleeve is operative to be connected to the sleeve of the rock bolt or to an end of another Cc said extension sleeve. N 37. A self drilling rock bolt according to claim 36, wherein the extension shaft is connected to the second end of the shaft or to another said extension shaft in a S 10 manner that allows the transmission of torque and thrust through the connection. 38. A method of stabilising rock, comprising: drilling a hole into the rock using a self drilling rock bolt having a shaft, a drilling end, an opposite end connected to a drilling apparatus, a sleeve extending along and around the shaft, and an anchoring device for anchoring the bolt in a drilled hole, the shaft being rotated in a first direction to drill the hole; providing drilling fluid to the drilling end during drilling of the hole by conveying fluid along a surface of the shaft; anchoring the rock bolt in the hole via the anchoring device by causing relative longitudinal movement of the sleeve and the shaft; and fixing the rock bolt within the hole to stabilise the rock. 39. The method of claim 38 wherein said longitudinal movement is toward said drilling end. A method according to claim 38 or 39, wherein the shaft is placed in tension in the hole prior to introducing grout into the hole. 41. A method according to claim 38, 39 or 40, wherein the drilling fluid passes along an outer surface of the shaft in an inner passage defined between the shaft and sleeve. 42. A method according to claim 41, further comprising forming an outer passage between the sleeve and rock surrounding the hole during drilling of the hole, with drilling fluid caused to flow to the drilling end through one of either the inner or outer passages, and to be removed through the other of the passages. 43. A method according to any one of claims 38 to 42, wherein grout is introduced into the hole to fix the rock bolt to the rock. 1331231-1:hxa:KEH 00 0 39 C 44. A method according to claim 43, wherein grout is caused to flow into 0 each of the inner and outer passages. O 45. The method of any one of claims 38 to 44, wherein said shaft is rotated Sin an opposite direction to said first direction to anchor the bolt. s Dated 3 October, 2008 Dunefire Pty Limited SPatent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON 1331231-1:hxa:KEH
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2004243343A AU2004243343C1 (en) | 2003-06-03 | 2004-06-03 | Rockbolt |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003902774A AU2003902774A0 (en) | 2003-06-03 | 2003-06-03 | Rock bolt |
| AU2003902774 | 2003-06-03 | ||
| AU2004900773A AU2004900773A0 (en) | 2004-02-16 | Rock Bolt | |
| AU2004900773 | 2004-02-16 | ||
| PCT/AU2004/000736 WO2004106700A1 (en) | 2003-06-03 | 2004-06-03 | Rockbolt |
| AU2004243343A AU2004243343C1 (en) | 2003-06-03 | 2004-06-03 | Rockbolt |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| AU2004243343A1 AU2004243343A1 (en) | 2004-12-09 |
| AU2004243343B2 AU2004243343B2 (en) | 2008-08-28 |
| AU2004243343C1 true AU2004243343C1 (en) | 2009-03-19 |
Family
ID=36500894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2004243343A Ceased AU2004243343C1 (en) | 2003-06-03 | 2004-06-03 | Rockbolt |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2004243343C1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3851560A (en) * | 1972-10-02 | 1974-12-03 | Deane C | Self-drilling expansion roof bolt |
| GB2352671A (en) * | 1999-08-03 | 2001-02-07 | Boart Longyear Ltd | Shank adapter |
| WO2002075116A1 (en) * | 2001-03-15 | 2002-09-26 | Atlas Copco Rock Drills Ab | A method for stabilization of rock and soil masses, and a rock bolt for practicing the method |
-
2004
- 2004-06-03 AU AU2004243343A patent/AU2004243343C1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3851560A (en) * | 1972-10-02 | 1974-12-03 | Deane C | Self-drilling expansion roof bolt |
| GB2352671A (en) * | 1999-08-03 | 2001-02-07 | Boart Longyear Ltd | Shank adapter |
| WO2002075116A1 (en) * | 2001-03-15 | 2002-09-26 | Atlas Copco Rock Drills Ab | A method for stabilization of rock and soil masses, and a rock bolt for practicing the method |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2004243343B2 (en) | 2008-08-28 |
| AU2004243343A1 (en) | 2004-12-09 |
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| DA2 | Applications for amendment section 104 |
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