CA2822653A1 - Rock bolt - Google Patents
Rock bolt Download PDFInfo
- Publication number
- CA2822653A1 CA2822653A1 CA2822653A CA2822653A CA2822653A1 CA 2822653 A1 CA2822653 A1 CA 2822653A1 CA 2822653 A CA2822653 A CA 2822653A CA 2822653 A CA2822653 A CA 2822653A CA 2822653 A1 CA2822653 A1 CA 2822653A1
- Authority
- CA
- Canada
- Prior art keywords
- rock bolt
- shaft
- deformed section
- protrusion
- installing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000011435 rock Substances 0.000 title claims abstract description 104
- 239000011347 resin Substances 0.000 claims description 37
- 229920005989 resin Polymers 0.000 claims description 37
- 239000002775 capsule Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 230000001737 promoting effect Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000005755 formation reaction Methods 0.000 description 6
- 239000013521 mastic Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/025—Grouting with organic components, e.g. resin
- E21D20/026—Cartridges; Grouting charges
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
- Connection Of Plates (AREA)
- Earth Drilling (AREA)
Abstract
Disclosed is a rock bolt comprising an elongate shaft extending between opposite leading and trailing ends and a deformed section disposed proximal to the leading end, the deformed section being configured such that a protrusion extends outwardly beyond an outer surface of the shaft.
Description
2 ROCK BOLT
Technical Field The present disclosure relates to rock bolts suitable for use in the mining and tunneling industry to provide rock and wall support. The rock bolt is suitable for softer strata, such as that often found in coal mines, as well as hard rock applications. It is to be appreciated that the term "rock" as used in the specification is to be given a broad meaning to cover both of these applications.
Background Roof and wall support is vital in mining and tunneling 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.
In conventional strata support systems, a bore is drilled into the rock by a drill rod, which is then removed and a rock bolt is then installed in the drilled hole and secured in place typically using a resin or cement based grout. The rock bolt is tensioned which allows consolidation of the strata by placing that strata in compression.
The rock bolt is typically formed from a steel rod.
To allow the rock bolt to be tensioned, the end of the bolt may be adhesively bonded to the rock formation with a bonding material inserted into the bore hole.
Alternatively, a combination of mechanical anchoring and bonding can be employed by using both an expansion assembly and resin bonding material.
When bonding material is used, the material adheres to the rock bolt and penetrates the surrounding rock formation to adhesively unite the rock strata and to hold firmly the rock bolt within the bore hole. In one form of anchoring, resin is inserted into the bore hole in the form of a two component plastic cartridge having one component containing a curable resin composition and another component containing a curing agent (catalyst). The two component resin cartridge is inserted into the blind end of the bore hole and the rock bolt is inserted into the bore hole such that the end of the rock bolt ruptures the two component resin cartridge. Upon rotation of the mine rock SUBSTITUTE SHEET (RULE 26) bolt about its longitudinal axis, the compartments within the resin cartridge are shredded and the components are mixed. The resin mixture fills the annular area between the bore hole wall and the shaft of the mine rock bolt. The mixed resin cures and binds the rock bolt to the surrounding rock.
The resin cartridge is ordinarily made from thin plastic type film which encases and separates the mastic and catalyst. A significant concern with resin anchored rock bolts is that the plastic film is not sufficiently shredded and/or pushed back to the rear of the bore during mixing. As a result the plastic film can sit between the rock bolt and the bore hole wall and prevent the bonding of the rock bolt to the rock of the bore hole.
Technical Field The present disclosure relates to rock bolts suitable for use in the mining and tunneling industry to provide rock and wall support. The rock bolt is suitable for softer strata, such as that often found in coal mines, as well as hard rock applications. It is to be appreciated that the term "rock" as used in the specification is to be given a broad meaning to cover both of these applications.
Background Roof and wall support is vital in mining and tunneling 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.
In conventional strata support systems, a bore is drilled into the rock by a drill rod, which is then removed and a rock bolt is then installed in the drilled hole and secured in place typically using a resin or cement based grout. The rock bolt is tensioned which allows consolidation of the strata by placing that strata in compression.
The rock bolt is typically formed from a steel rod.
To allow the rock bolt to be tensioned, the end of the bolt may be adhesively bonded to the rock formation with a bonding material inserted into the bore hole.
Alternatively, a combination of mechanical anchoring and bonding can be employed by using both an expansion assembly and resin bonding material.
When bonding material is used, the material adheres to the rock bolt and penetrates the surrounding rock formation to adhesively unite the rock strata and to hold firmly the rock bolt within the bore hole. In one form of anchoring, resin is inserted into the bore hole in the form of a two component plastic cartridge having one component containing a curable resin composition and another component containing a curing agent (catalyst). The two component resin cartridge is inserted into the blind end of the bore hole and the rock bolt is inserted into the bore hole such that the end of the rock bolt ruptures the two component resin cartridge. Upon rotation of the mine rock SUBSTITUTE SHEET (RULE 26) bolt about its longitudinal axis, the compartments within the resin cartridge are shredded and the components are mixed. The resin mixture fills the annular area between the bore hole wall and the shaft of the mine rock bolt. The mixed resin cures and binds the rock bolt to the surrounding rock.
The resin cartridge is ordinarily made from thin plastic type film which encases and separates the mastic and catalyst. A significant concern with resin anchored rock bolts is that the plastic film is not sufficiently shredded and/or pushed back to the rear of the bore during mixing. As a result the plastic film can sit between the rock bolt and the bore hole wall and prevent the bonding of the rock bolt to the rock of the bore hole.
3.0 Another concern is creating the required turbulence and torque for mixing the resin to evening combine the catalyst through the mastic. Under-mixing of the resin results in an unset resin which is low in strength.
Summary of the Disclosure Disclosed is a rock bolt comprising an elongate shaft extending between opposite leading and trailing ends and a deformed section disposed proximal to the leading end, the deformed section being configured such that a protrusion extends outwardly beyond an outer surface of the shaft.
In one form the protrusion extends radially outwardly from the outer surface of the shaft.
In one form the protrusion comprises a flat face extending outwardly from the outer surface of the shaft and terminating at an edge.
In one form the protrusion comprises two opposing flat faces extending outwardly from the outer surface of the shaft and connected by a periphery of the protrusion.
In one form the rock bolt has an axis of rotation extending longitudinally through the shaft and the protrusion is oriented such that during rotation at least one flat face is forwardly facing with respect to the rotary movement.
In one form the deformed section is configured such that a depression extends =
radially inwardly from the outer surface of the shaft.
SUBSTITUTE SHEET (RULE 26) The deformed section of the rock bolt allows for shredding of the resin capsule through rotation of the deformed section with the rock bolt causing the edge portions to contact and shred the resin capsule membrane. The deformed section further increases turbulence in the resin about the rock bolt and allows a reduction in the annular region about the deformed section of the rock bolt once within the bore. This allows resin contained within the bore to be more effective.
In a second aspect, disclosed is a rock bolt comprising an elongate shaft extending between opposite leading and trailing ends and a deformed section disposed proximal to the leading end, the deformed section being configured to have at least one edge, at io least a portion of the edge being disposed radially outwardly from the periphery of the shaft.
In one form the deformed section includes two edges.
In one form a face extends from the edge to the shaft, the face being oriented such that during rotation of the shaft about its longitudinal axis, the face is forwardly facing is with respect to the rotary movement.
In a third aspect, disclosed is a method of installing a rock bolt in a bore comprising the steps of drilling a bore hole, positioning a resin capsule in the distal end of the bore hole, inserting the leading end of a rock bolt into the bore hole and applying rotation to the rock bolt such that the resin capsule is shredded, wherein the rock bolt 20 includes a deformed section adapted to shred the capsule.
In one form the deformed section is configured such that a protrusion extends outwardly beyond an outer surface of the shaft.
In one form the protrusion extends radially outwardly from the outer surface of the shaft.
25 In one form the protrusion comprises a flit Tke extending outwardly from the outer surface of the shaft and terminating at an edge.
In one form the protrusion comprises two opposing flat faces extending outwardly from the outer surface of the shaft and connected by a periphery of the protrusion.
In one form the protrusion is oriented such that during rotation at least one flat 30 face is forwardly facing with respect to the rotary movement.
SUBSTITUTE SHEET (RULE 26)
Summary of the Disclosure Disclosed is a rock bolt comprising an elongate shaft extending between opposite leading and trailing ends and a deformed section disposed proximal to the leading end, the deformed section being configured such that a protrusion extends outwardly beyond an outer surface of the shaft.
In one form the protrusion extends radially outwardly from the outer surface of the shaft.
In one form the protrusion comprises a flat face extending outwardly from the outer surface of the shaft and terminating at an edge.
In one form the protrusion comprises two opposing flat faces extending outwardly from the outer surface of the shaft and connected by a periphery of the protrusion.
In one form the rock bolt has an axis of rotation extending longitudinally through the shaft and the protrusion is oriented such that during rotation at least one flat face is forwardly facing with respect to the rotary movement.
In one form the deformed section is configured such that a depression extends =
radially inwardly from the outer surface of the shaft.
SUBSTITUTE SHEET (RULE 26) The deformed section of the rock bolt allows for shredding of the resin capsule through rotation of the deformed section with the rock bolt causing the edge portions to contact and shred the resin capsule membrane. The deformed section further increases turbulence in the resin about the rock bolt and allows a reduction in the annular region about the deformed section of the rock bolt once within the bore. This allows resin contained within the bore to be more effective.
In a second aspect, disclosed is a rock bolt comprising an elongate shaft extending between opposite leading and trailing ends and a deformed section disposed proximal to the leading end, the deformed section being configured to have at least one edge, at io least a portion of the edge being disposed radially outwardly from the periphery of the shaft.
In one form the deformed section includes two edges.
In one form a face extends from the edge to the shaft, the face being oriented such that during rotation of the shaft about its longitudinal axis, the face is forwardly facing is with respect to the rotary movement.
In a third aspect, disclosed is a method of installing a rock bolt in a bore comprising the steps of drilling a bore hole, positioning a resin capsule in the distal end of the bore hole, inserting the leading end of a rock bolt into the bore hole and applying rotation to the rock bolt such that the resin capsule is shredded, wherein the rock bolt 20 includes a deformed section adapted to shred the capsule.
In one form the deformed section is configured such that a protrusion extends outwardly beyond an outer surface of the shaft.
In one form the protrusion extends radially outwardly from the outer surface of the shaft.
25 In one form the protrusion comprises a flit Tke extending outwardly from the outer surface of the shaft and terminating at an edge.
In one form the protrusion comprises two opposing flat faces extending outwardly from the outer surface of the shaft and connected by a periphery of the protrusion.
In one form the protrusion is oriented such that during rotation at least one flat 30 face is forwardly facing with respect to the rotary movement.
SUBSTITUTE SHEET (RULE 26)
4 In one form the deformed section is configured such that a depression extends radially inwardly from the outer surface of the shaft.
In one form the shaft is sized such that the space between the inner wall of the bore hole and the outer surface of the shaft is less than 3mm.
In one form the deformed section facilitates chemical fixing of the rock bolt by the resin within the bore by promoting turbulence within the resin.
In one form the deformed section facilitates chemical fixing of the rock bolt by the resin within the bore by promoting mixing of the resin components on rotation of the deformed section.
Brief Description of the Drawings Preferred embodiments of the rock bolt will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure 1 illustrates a side view of one embodiment of a rock bolt according to the disclosure;
Figure 2 illustrates a side view of the rock bolt of Figure I rotated through 90';
Figure 3 illustrates a cross-sectional view of the rock bolt of Figure 2 through X-X;
Figure 4 illustrates a side view of the rock bolt of Figure 1.
Detailed Description of Preferred Embodiments Referring to the Figs, disclosed is a rock bolt 1 comprising a shaft 2 extending from a leading end 3 to a trailing end 4. The rock bolt 1 is adapted to be inserted into a bore hole within a rock formation to reinforce and-apply tension to the rock formation.
The rock bolt 1 includes a deformed section 6 which is positioned proximal the leading end 3 of the shaft 2. In the illustrated form, the deformed section comprises two protrusions 8 which extend radially outwardly from the outer surface 10 of the shaft 2.
The deformed section further comprises four depressions 11 which are radially indented from the outer surface 10 of the shaft 2.
SUBSTITUTE SHEET (RULE 26) The protrusions 8 include two faces 13 which each extend from a respective depression 11 outwardly of the shaft. The faces 13 terminate at an edge 14 which forms an approximate right angle with a periphery 16 of the protrusion. The periphery 16 of the protrusion 8 extends between two edges 14 and therefore extends between two faces
In one form the shaft is sized such that the space between the inner wall of the bore hole and the outer surface of the shaft is less than 3mm.
In one form the deformed section facilitates chemical fixing of the rock bolt by the resin within the bore by promoting turbulence within the resin.
In one form the deformed section facilitates chemical fixing of the rock bolt by the resin within the bore by promoting mixing of the resin components on rotation of the deformed section.
Brief Description of the Drawings Preferred embodiments of the rock bolt will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure 1 illustrates a side view of one embodiment of a rock bolt according to the disclosure;
Figure 2 illustrates a side view of the rock bolt of Figure I rotated through 90';
Figure 3 illustrates a cross-sectional view of the rock bolt of Figure 2 through X-X;
Figure 4 illustrates a side view of the rock bolt of Figure 1.
Detailed Description of Preferred Embodiments Referring to the Figs, disclosed is a rock bolt 1 comprising a shaft 2 extending from a leading end 3 to a trailing end 4. The rock bolt 1 is adapted to be inserted into a bore hole within a rock formation to reinforce and-apply tension to the rock formation.
The rock bolt 1 includes a deformed section 6 which is positioned proximal the leading end 3 of the shaft 2. In the illustrated form, the deformed section comprises two protrusions 8 which extend radially outwardly from the outer surface 10 of the shaft 2.
The deformed section further comprises four depressions 11 which are radially indented from the outer surface 10 of the shaft 2.
SUBSTITUTE SHEET (RULE 26) The protrusions 8 include two faces 13 which each extend from a respective depression 11 outwardly of the shaft. The faces 13 terminate at an edge 14 which forms an approximate right angle with a periphery 16 of the protrusion. The periphery 16 of the protrusion 8 extends between two edges 14 and therefore extends between two faces
5 13.
The deformed section 6 is formed by pinching or pressing the material of the rock bolt during manufacture.
The deformed section 6 of the device has a cross sectional length A-A through the protrusions 8 that is larger than the diameter of the drill bit that forms the bore hole. The 3.0 cross sectional length A-A is greater than the diameter of the drill bit by between 1 and 3 mms. In one embodiment the cross sectional length A-A is greater than the diameter of the drill bit by 2 mm.
The deformed section of the device has a cross sectional length B-B through the depressions 11 that is less than the diameter of the drill bit that forms the bore hole. The cross sectional length B-B is less than the drill bit diameter of the bore hole by between 0.5 and 2 mms. In one embodiment the cross sectional length B-B is less than the diameter of the drill bit by 1 mm.
The deformed section 6 of the rock bolt can be inserted into the bore as the point at which the deformed section is wider than the diameter of the bore hole is simply a point contact with a rifled hole. Further as the bore hole is typically 0.5 ¨
2mm greater in diameter than the drill bit, the tolerance for inserting a larger deformed section is greater. Use of hydraulic bolting rigs allows an installer to insert the deformed section 6 and the rock bolt 1 into the bore hole despite the close fit. This is especially the case in softer rock formations but is possible in a variety of rock formations. Use of a high break out shear pin or reverse twist drive mechanisms can also allow insertion of the rock bolt I with the deformed section 6- into the bore hole.
In use, the rock bolt 1 with the deformed section 6 is inserted into a bore along with a resin capsule. The resin capsule which includes resin mastic and catalyst is positioned at the distal end of the bore. The rock bolt 1 is rotated resulting in rotation of the deformed section 6. The edges 14 have a cutting or shredding action that shreds the film membrane of the resin capsule allowing mixing of the mastic and the catalyst.
SUBSTITUTE SHEET (RULE 26)
The deformed section 6 is formed by pinching or pressing the material of the rock bolt during manufacture.
The deformed section 6 of the device has a cross sectional length A-A through the protrusions 8 that is larger than the diameter of the drill bit that forms the bore hole. The 3.0 cross sectional length A-A is greater than the diameter of the drill bit by between 1 and 3 mms. In one embodiment the cross sectional length A-A is greater than the diameter of the drill bit by 2 mm.
The deformed section of the device has a cross sectional length B-B through the depressions 11 that is less than the diameter of the drill bit that forms the bore hole. The cross sectional length B-B is less than the drill bit diameter of the bore hole by between 0.5 and 2 mms. In one embodiment the cross sectional length B-B is less than the diameter of the drill bit by 1 mm.
The deformed section 6 of the rock bolt can be inserted into the bore as the point at which the deformed section is wider than the diameter of the bore hole is simply a point contact with a rifled hole. Further as the bore hole is typically 0.5 ¨
2mm greater in diameter than the drill bit, the tolerance for inserting a larger deformed section is greater. Use of hydraulic bolting rigs allows an installer to insert the deformed section 6 and the rock bolt 1 into the bore hole despite the close fit. This is especially the case in softer rock formations but is possible in a variety of rock formations. Use of a high break out shear pin or reverse twist drive mechanisms can also allow insertion of the rock bolt I with the deformed section 6- into the bore hole.
In use, the rock bolt 1 with the deformed section 6 is inserted into a bore along with a resin capsule. The resin capsule which includes resin mastic and catalyst is positioned at the distal end of the bore. The rock bolt 1 is rotated resulting in rotation of the deformed section 6. The edges 14 have a cutting or shredding action that shreds the film membrane of the resin capsule allowing mixing of the mastic and the catalyst.
SUBSTITUTE SHEET (RULE 26)
6 Further, the close fit of the deformed section 6 within the bore hole acts to further shred the capsule. The faces 13 of the deformed section 6 create interference and turbulence within the resin to promote mixing of the mastic and the catalyst allowing for a more effective resin.
It can be seen that the present embodiment improves the mixing of the resin mastic and catalyst within the bore and reduces the problem of a rock bolt being "gloved" or surrounded by the casing of the resin capsule. This results in an effective bond between the bore surface and the rock bolt.
As will be understood, variations of the above described rock bolt can be made 3.o without departing from the scope of the appended claims. For example, in an alternative embodiment of the deformed section, the deformed section may comprise...
While the rock bolt has been described in reference to its preferred embodiments, it is to be understood that the words which have been used are words of description rather than limitation and that changes may be made without departing from its scope as defined by the appended claims.
It is to be understood that a reference herein to a prior art document does not =
constitute an admission that the document forms part of the common general knowledge in the art in Australia or in any other country.
In the claims which follow and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the rock bolt.
SUBSTITUTE SHEET (RULE 26)
It can be seen that the present embodiment improves the mixing of the resin mastic and catalyst within the bore and reduces the problem of a rock bolt being "gloved" or surrounded by the casing of the resin capsule. This results in an effective bond between the bore surface and the rock bolt.
As will be understood, variations of the above described rock bolt can be made 3.o without departing from the scope of the appended claims. For example, in an alternative embodiment of the deformed section, the deformed section may comprise...
While the rock bolt has been described in reference to its preferred embodiments, it is to be understood that the words which have been used are words of description rather than limitation and that changes may be made without departing from its scope as defined by the appended claims.
It is to be understood that a reference herein to a prior art document does not =
constitute an admission that the document forms part of the common general knowledge in the art in Australia or in any other country.
In the claims which follow and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the rock bolt.
SUBSTITUTE SHEET (RULE 26)
Claims (26)
1. A rock bolt comprising an elongate shaft extending between opposite leading and trailing ends and a deformed section disposed proximal to the leading end, the deformed section being configured such that a protrusion extends outwardly beyond an outer surface of the shaft.
2. A rock bolt as defined in claim 1, wherein the protrusion extends radially outwardly from the outer surface of the shaft.
3. A rock bolt as defined in claim 1 or 2, wherein the protrusion comprises a flat face extending outwardly from the outer surface of the shaft and terminating at an edge.
4. A rock bolt as defined in any of the preceding claims, wherein the protrusion comprises two opposing flat faces extending outwardly from the outer surface of the shaft and connected by a periphery of the protrusion.
5. A rock bolt as defined in any of the preceding claims, wherein the rock bolt has an axis of rotation extending longitudinally through the shaft and the protrusion is oriented such that during rotation at least one flat face is forwardly facing with respect to the rotary movement.
6. A rock bolt as defined in any of the preceding claims, wherein the deformed section is configured such that a depression extends radially inwardly from the outer surface of the shaft
7. A rock bolt as defined in any of the preceding claims, wherein the rock bolt is adapted to be inserted into a bore hole, the bore hole having a diameter less than the largest cross-sectional length of the deformed section of the rock bolt.
8. A rock bolt comprising an elongate shaft extending between opposite leading and trailing ends and a deformed section disposed proximal to the leading end, the deformed section being configured to have at least one edge, at least a portion of the edge being disposed radially outwardly from the periphery of the shaft.
9. A rock bolt as defined in claim 8, wherein the deformed section includes two edges.
10. A rock bolt as defined in claim 8 or 9, wherein the rock bolt includes two deformed sections.
11. A rock bolt as defined in any one of claims 8 ¨ 10, further comprising a face extending from the edge to the shaft, the face being oriented such that during rotation of the shaft about its longitudinal axis, the face is forwardly facing with respect to the rotary movement.
12. A method of installing a rock bolt in a bore comprising the steps of drilling a bore hole, positioning a resin capsule in the distal end of the bore hole, inserting the leading end of a rock bolt into the bore hole and applying rotation to the rock bolt such that the resin capsule is shredded, wherein the rock bolt includes a deformed section adapted to shred the capsule.
13. A method of installing a rock bolt as defined in claim 12, wherein the deformed section comprises at least one protrusion extending outwardly from the shaft and the step of drilling the bore hole utilizes a drill bit with a diameter between 1mm and 3mm less than the cross sectional width of the rock bolt extending through at least one protrusion.
14. A method of installing a rock bolt as defined in claim 13, wherein the deformed section comprises two protrusions and the drill bit has a diameter between 1mm and 3mm less than the cross sectional width of the rock bolt extending through the protrusions.
15. A method of installing a rock bolt as defined in claim 13 or 14, wherein the protrusion extends radially outwardly from the outer surface of the shaft.
16. A method of installing a rock bolt as defined in any one of claims 13 ¨
15, wherein the protrusion comprises a flat face extending outwardly from the outer surface of the shaft and terminating at an edge.
15, wherein the protrusion comprises a flat face extending outwardly from the outer surface of the shaft and terminating at an edge.
17. A method of installing a rock bolt as defined in claim 16, wherein the protrusion comprises two opposing flat faces extending outwardly from the outer surface of the shaft and connected by a periphery of the protrusion.
18. A method of installing a rock bolt as defined in claim 16 or 17, wherein at least one flat face is forwardly facing with respect to the rotary movement
19. A method of installing a rock bolt as defined in any on of claims 12 ¨
18, wherein the deformed section is configured such that a depression extends radially inwardly from the outer surface of the shaft.
18, wherein the deformed section is configured such that a depression extends radially inwardly from the outer surface of the shaft.
20. A method of installing a rock bolt as defined in any on of claims 12 ¨
19, wherein the shaft is sized such that the space between the inner wall of the bore hole and the outer surface of the shaft is less than 3mm.
19, wherein the shaft is sized such that the space between the inner wall of the bore hole and the outer surface of the shaft is less than 3mm.
21. A method of installing a rock bolt as defined in any on of claims 12 ¨
20, wherein the deformed section facilitates chemical fixing of the rock bolt by the resin within the bore by promoting turbulence within the resin.
20, wherein the deformed section facilitates chemical fixing of the rock bolt by the resin within the bore by promoting turbulence within the resin.
22. A method of installing a rock bolt as defined in any on of claims 12 ¨
21, wherein the deformed section facilitates chemical fixing of the rock bolt by the resin within the bore by promoting mixing of the resin components on rotation of the deformed section.
21, wherein the deformed section facilitates chemical fixing of the rock bolt by the resin within the bore by promoting mixing of the resin components on rotation of the deformed section.
23. A method of manufacturing a rock bolt comprising pinching a portion of the rock bolt proximal the leading end to form a deformed section, the deformed section being configured such that a protrusion extends outwardly beyond an outer surface of the shaft.
24. A method of manufacturing a rock bolt as defined in claim 23, wherein the deformed section is configured to have at least one edge, at least a portion of the edge being disposed radially outwardly from the periphery of the shaft.
25. A rock bolt substantially as herein described with reference to the accompanying drawings.
26. A method of installing a rock bolt substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2010905675 | 2010-12-24 | ||
| AU2010905675A AU2010905675A0 (en) | 2010-12-24 | Rock Bolt | |
| PCT/AU2011/001611 WO2012083342A1 (en) | 2010-12-24 | 2011-12-15 | Rock bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2822653A1 true CA2822653A1 (en) | 2012-06-28 |
Family
ID=46312880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2822653A Abandoned CA2822653A1 (en) | 2010-12-24 | 2011-12-15 | Rock bolt |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20140010598A1 (en) |
| EP (1) | EP2655798A1 (en) |
| AU (1) | AU2011349105A1 (en) |
| CA (1) | CA2822653A1 (en) |
| CL (1) | CL2013001869A1 (en) |
| WO (1) | WO2012083342A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2013202781A1 (en) | 2012-02-22 | 2013-09-05 | Fci Holdings Delaware, Inc. | Fibreglass roof and rib plate |
| CA2862115C (en) * | 2012-03-09 | 2020-05-12 | Nv Bekaert Sa | Strand, cable bolt and its installation |
| MX2021009778A (en) * | 2019-02-13 | 2021-10-26 | Fci Holdings Delaware Inc | Resin injection dolly. |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2006813A (en) * | 1934-06-06 | 1935-07-02 | Nor Bolt Holding Corp | Self-locking drive expansion fastener |
| US2898964A (en) * | 1953-12-23 | 1959-08-11 | Olin Mathieson | Explosively driven stud with split shank locking means |
| US4564315A (en) * | 1983-07-05 | 1986-01-14 | Rozanc Richard C | Method for anchoring a bolt in a rock-like structure |
| US4649729A (en) * | 1985-01-14 | 1987-03-17 | Florida Steel Corporation | Method for manufacturing steel bar with intermittent smooth surface and patterned relief segments, and mine roof bolt product |
| US4659258A (en) * | 1985-10-21 | 1987-04-21 | Scott Limited Partners | Dual stage dynamic rock stabilizing fixture and method of anchoring the fixture in rock formations |
| US4955219A (en) * | 1986-11-14 | 1990-09-11 | Videx-Wire Products (Proprietary) Limited | Rock bolt |
| GB8631004D0 (en) * | 1986-12-30 | 1987-02-04 | Fosroc International Ltd | Anchoring |
| US5054146A (en) * | 1988-12-08 | 1991-10-08 | Videx-Wire Products (Pty.) Limited | Anchor bolt |
| US5076734A (en) * | 1990-10-05 | 1991-12-31 | H & S Machine And Supply Co., Inc. | Roof bolt with paddle resin mixer and method for making the same |
| US5378087A (en) * | 1991-09-25 | 1995-01-03 | Locotos; Frank M. | Mine roof support apparatus and method |
| US5273377A (en) * | 1992-11-30 | 1993-12-28 | Taylor Alton E | Roof bolt |
| AU5360600A (en) * | 1999-08-24 | 2001-03-01 | Dywidag-Systems International Pty. Limited | Rock bolt |
| DE10046804A1 (en) * | 2000-09-18 | 2002-04-04 | Erich Borgmeier | Strata or rock bolt with smooth or profile shaft uses pick-type mixing tip converted from bolt during production to crush open and mix chambered cartridges assisted by mixer blades further back. |
| US7037058B2 (en) * | 2001-03-21 | 2006-05-02 | Industrial Roll Formers Pty. Ltd. | Resin embedded rock bolt |
| AU2006252071A1 (en) * | 2005-12-19 | 2007-07-05 | Minova Australia Pty Limited | Rock bolt tip, rock bolt & associated methods |
| CN102472103A (en) * | 2009-08-05 | 2012-05-23 | F.M.洛克托斯公司 | Tensionable tubular resin anchored tubular bolt and method |
-
2011
- 2011-12-15 CA CA2822653A patent/CA2822653A1/en not_active Abandoned
- 2011-12-15 EP EP11851308.4A patent/EP2655798A1/en not_active Withdrawn
- 2011-12-15 AU AU2011349105A patent/AU2011349105A1/en not_active Abandoned
- 2011-12-15 WO PCT/AU2011/001611 patent/WO2012083342A1/en active Application Filing
- 2011-12-15 US US13/997,400 patent/US20140010598A1/en not_active Abandoned
-
2013
- 2013-06-24 CL CL2013001869A patent/CL2013001869A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP2655798A1 (en) | 2013-10-30 |
| CL2013001869A1 (en) | 2013-12-13 |
| AU2011349105A1 (en) | 2013-05-02 |
| US20140010598A1 (en) | 2014-01-09 |
| WO2012083342A1 (en) | 2012-06-28 |
| WO2012083342A9 (en) | 2012-10-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20161215 |