US20170298732A1 - Rock bolt - Google Patents
Rock bolt Download PDFInfo
- Publication number
- US20170298732A1 US20170298732A1 US15/514,426 US201515514426A US2017298732A1 US 20170298732 A1 US20170298732 A1 US 20170298732A1 US 201515514426 A US201515514426 A US 201515514426A US 2017298732 A1 US2017298732 A1 US 2017298732A1
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- US
- United States
- Prior art keywords
- energy
- absorbing part
- rock bolt
- tubular part
- absorbing
- 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
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/02—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection having means for indicating tension
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/008—Anchoring or tensioning means
Definitions
- the present invention concerns a rock bolt for the absorption of forces during the reinforcement of rock chambers in mines and during similar work with rock.
- a second method is to deform or strain the bolt. If the degree of strain is large, the absorption of energy is also large. The larger the degree of strain, the larger the absorption of energy.
- the disengaged length which is the length between attachment of the bolt inside the borehole and the free end of the bolt, should be as long possible.
- An embedded dynamic rock bolt normally consists of an extent with a thread with a screw joint, and one or several attachment regions along the bolt.
- attachment region is here used to denote one or several regions along the extent of the bolt that has been embedded in the borehole.
- the energy-absorbing regions along the bolt, at which the bolt can be strained, are constituted by stretches between the embedded parts that have a low friction between the grout and the bolt. A bolt with several anchors reduces the energy-absorbing ability of the bolt, since the stretch over which the bolt can be strained is reduced.
- the purpose of the present invention is to remove the problems described above by offering an embedded dynamic rock bolt of which the energy-absorbing ability is larger since the extent that can be strained being longer than it is in conventional embedded dynamic rock bolts.
- This purpose is achieved through an embedded dynamic rock bolt with an energy-absorbing part that is located in a protected environment without being able to come into contact with the grout, at the same time as the energy-absorbing part is as long as possible.
- FIG. 1 shows a side view of a rock bolt according to the invention with an anchor with a wedge
- FIG. 1A shows an alternative embodiment of a rock bolt according to the invention
- FIG. 2 shows the rock bolt from FIG. 1 in cut-through view
- FIG. 2A shows the rock bolt from FIG. 1A in cut-through view
- FIG. 3 shows an end view of a screw joint
- FIG. 4 shows an end view of an anchor
- FIG. 5 shows the bolt from FIG. 1 , where the anchor has been exchanged for a stirring arrangement
- FIG. 6 a shows an external tubular part provided with lugs
- FIG. 6 b shows an external tubular part with perforations
- FIG. 6 c shows an external tubular part with a pattern
- FIG. 7 a shows an energy-absorbing part in the form of a reinforcement member
- FIG. 7 b shows an energy-absorbing part in the form of a wire
- FIG. 7 c shows an energy-absorbing part in the form of a steel rod
- FIG. 7 d shows an energy-absorbing part in the form of a composite material
- FIG. 8 shows rock with a borehole for the introduction of a rock bolt.
- FIG. 1 shows a rock bolt 1 according to the invention intended to be embedded in a borehole 2 in rock.
- the rock bolt 1 comprises an extended external tubular part 3 and an internal extended energy-absorbing part 4 .
- the external part 3 has been given a length that is somewhat less than the length of the energy-absorbing part 4 .
- the external tubular part 3 has a first end 5 and a second end 6 , and a magnitude that allows the energy-absorbing part 4 to be surrounded by the external part 3 . It is an advantage if the external part 3 has circular cross-section in the form of a circularly symmetrical metal tube, but it should be realised that also other forms and materials are possible. Square, elliptical or rectangular tubes, of metal, plastic or composite material can, for example, be used. Also other forms of the external tubular part 3 can be used.
- the jacket 7 of the external tubular part 3 is, as is shown in FIGS. 6 a -6 c , arranged with a friction-increasing structure, for example in the form of a pattern 8 .
- the jacket 7 may be arranged with lugs 9 , in the same manner as the lugs on a commonly occurring reinforcement member.
- the jacket 7 also may be arranged with perforations 10 , or with various combinations of pattern, lugs and perforations.
- the purpose of the friction-increasing structure is to give a better attachment surface in the concrete into which the bolt 1 has been embedded. If the jacket 7 is provided with perforations 10 , the concrete is given the possibility to grip onto the tubular part 3 without the concrete running into the tubular part and making contact with the energy-absorbing part 4 .
- the internal energy-absorbing part 4 demonstrates a length that exceeds the length of the external tubular part 3 .
- the energy-absorbing part 4 comprises a reinforcement member 4 a , but it can in other embodiments comprise a wire 4 b , a rod 4 c or an extended member of a composite material 4 d , as shown in FIGS. 7 a -7 d .
- One end 11 of the internal energy-absorbing part 4 is arranged with an anchor 12 in the form of a slot 13 with a wedge 14 .
- the slot 13 is placed in the end 11 of the energy-absorbing part 4 in such a manner that the end has a division to a certain extent.
- a wedge 14 is located in the slot 13 .
- the bolt 1 is introduced into the borehole 2 and reaches the bottom of the borehole, the bolt 1 is pressed or beaten against the bottom of the borehole such that the wedge 14 is pressed into the slot 13 .
- the wedge 14 is pressed into the slot 13 , the parts on the two sides of the slot are pressed outwards against the walls of the borehole and attach in this manner the end 11 of the rock bolt in the borehole 2 .
- the second end 15 of the energy-absorbing part 4 is provided with a threaded section 16 that extends a certain distance into the energy-absorbing part 4 .
- the threaded section 16 is intended to be located outside of the borehole when the bolt 1 has been introduced into the hole 2 , and has a diameter that is equal to or greater than the external dimension of the outer part, as shown in FIGS. 1 and 2 . The purpose of this is to avoid any weakening of the internal energy-absorbing part caused by the thread.
- a screw joint 17 in the form of a nut 18 , a washer 19 and a force distributor in the form of a half sphere 20 is mounted at the threaded section 16 .
- the rock bolt 1 When the rock bolt 1 is mounted and embedded in the borehole 2 , it is prestressed by the screw joint 17 .
- the task of the half sphere 20 is to direct the force from the rock against the washer 19 and the nut 18 .
- the internal energy-absorbing part 4 comprises a wire 4 b or a composite material 4 d
- the threaded section 16 and the anchor 12 are attached to the energy-absorbing part 4 c or 4 d through welding, gluing or in another manner permanent attached.
- the internal energy-absorbing part 4 is introduced into, placed inside, the external tubular part 3 .
- One end 5 of the external tubular part 3 is attached at the internal energy-absorbing part 4 in association with the anchor 12 .
- the second end 6 of the tubular part 3 is attached in close association with the screw joint 17 , in direct association with the end of the threaded section 16 .
- the ends 5 , 6 of the external tubular part 3 are attached by means of welding with fully welded joins S. It should, however, be realised that another type of fastening can be used, such as gluing or other permanent fastening. Gluing is particularly appropriate when other material than steel is used for the energy-absorbing part 4 and/or the external tubular part 3 .
- only the end 5 of the tubular part is attached through welding with fully welded joins to the internal energy-absorbing part in association with the anchor 12 .
- the length of the tubular part 3 is adapted such that its second end 6 comes into contact with the washer 19 and makes contact with it when the rock bolt is prestressed.
- the preferred rock bolt is mounted in the following manner as shown in FIG. 8 : a fixing material such as concrete is introduced into the borehole 2 when it has been drilled in the rock.
- the rock bolt 1 is subsequently introduced into the hole with the anchor 12 entering the borehole first.
- the bolt is pressed or beaten against the bottom of the borehole such that the anchor becomes attached and the bolt is fixed.
- the screw joint 17 is mounted on the part of the threaded part 16 that protrudes from the borehole 2 , and is tightened such that the energy-absorbing part 4 is prestressed.
- the bolt 2 is provided with an anchor in the form of a stirring arrangement 21 formed by a blade or disk having the form of a paddle, instead of the wedge.
- the resin is introduced into the borehole, after which the bolt is introduced into the borehole and rotated such that the resin is mixed by the stirring arrangement 21 .
- the resin hardens rapidly, which is why the screw joint 17 can be mounted and prestressed in direct association with the insertion of the bolt 1 into the hole 2 .
- the energy-absorbing part 4 is not subject to corrosion or other influences that can weaken the bolt 1 . This gives a lifetime that is longer than that of other types of embedded rock bolt.
- the rock bolt 1 is given a maximum extent over which the bolt can be bent, since the energy-absorbing part 4 does not come into contact with the embedding material. This gives the advantage that the rock bolt can be bent more extensively and in this way can absorb larger forces than those absorbed by other types of embedded rock bolt.
- the rock bolt is manufactured in the following manner:
- a final step in the manufacture comprises
- the final step in the manufacture comprises
- the internal dimension of the external tubular part 3 i.e. its internal diameter in the case in which it comprises a circular pipe, exceeds the external dimension or the diameter of the energy-absorbing part 4 .
- the dimensions may be so adapted that the energy-absorbing part 4 must be pressed into the external tubular part 3 , but it should be realised that it is an advantage if the external tubular part 3 has an internal dimension that is large enough to allow the internal energy-absorbing part 4 to move or be displaced freely relative to the tubular part 3 before the fastening, by, for example, welding or gluing. If the internal dimension of the external tubular part 3 is sufficiently large relative to the dimension of the internal energy-absorbing part 4 , the advantage is achieved that the risk that grout comes into contact with the energy-absorbing part is minimised.
Abstract
A rock bolt to be embedded in a borehole and a method of manufacturing a rock bolt, the rock bolt including an extended energy-absorbing part, the first end of the energy-absorbing part including an anchor and the second end of the energy-absorbing part including a screw joint for prestressing the rock bolt. The rock bolt includes an extended tubular part with a jacket and a first end section and a second end section, with an internal dimension that is larger than the external dimension of the energy-absorbing part and arranged in such a manner that it surrounds the energy-absorbing part.
Description
- The present invention concerns a rock bolt for the absorption of forces during the reinforcement of rock chambers in mines and during similar work with rock.
- Mines in the world are being constructed ever deeper in order to reach minerals. This leads to increased rock tension and an increased risk of seismic activity. As the depth increases and in regions with large deformations, reinforcement with the ability to absorb energy, known as “dynamic reinforcement”, is used.
- There are principally two different types of energy-absorbing bolt. In one variant, the absorption of energy takes place through friction between the bolt and the grout or between the bolt and the borehole. The bolt glides and absorbs energy.
- A second method is to deform or strain the bolt. If the degree of strain is large, the absorption of energy is also large. The larger the degree of strain, the larger the absorption of energy.
- In order to achieve as large a degree of strain as possible, the disengaged length, which is the length between attachment of the bolt inside the borehole and the free end of the bolt, should be as long possible.
- An embedded dynamic rock bolt normally consists of an extent with a thread with a screw joint, and one or several attachment regions along the bolt. The term “attachment region” is here used to denote one or several regions along the extent of the bolt that has been embedded in the borehole. The energy-absorbing regions along the bolt, at which the bolt can be strained, are constituted by stretches between the embedded parts that have a low friction between the grout and the bolt. A bolt with several anchors reduces the energy-absorbing ability of the bolt, since the stretch over which the bolt can be strained is reduced.
- One disadvantage of dynamic embedded bolts arises if damage in the rock chamber reaches the region between the anchors, since in this case no counteracting forces are present to hold the rock in place.
- The purpose of the present invention is to remove the problems described above by offering an embedded dynamic rock bolt of which the energy-absorbing ability is larger since the extent that can be strained being longer than it is in conventional embedded dynamic rock bolts.
- This purpose is achieved through an embedded dynamic rock bolt with an energy-absorbing part that is located in a protected environment without being able to come into contact with the grout, at the same time as the energy-absorbing part is as long as possible.
- The invention will be described below with reference to the attached drawings of which:
-
FIG. 1 shows a side view of a rock bolt according to the invention with an anchor with a wedge, -
FIG. 1A shows an alternative embodiment of a rock bolt according to the invention, -
FIG. 2 shows the rock bolt fromFIG. 1 in cut-through view, -
FIG. 2A shows the rock bolt fromFIG. 1A in cut-through view, -
FIG. 3 shows an end view of a screw joint, -
FIG. 4 shows an end view of an anchor, -
FIG. 5 shows the bolt fromFIG. 1 , where the anchor has been exchanged for a stirring arrangement, -
FIG. 6a shows an external tubular part provided with lugs, -
FIG. 6b shows an external tubular part with perforations, -
FIG. 6c shows an external tubular part with a pattern, -
FIG. 7a shows an energy-absorbing part in the form of a reinforcement member, -
FIG. 7b shows an energy-absorbing part in the form of a wire, -
FIG. 7c shows an energy-absorbing part in the form of a steel rod, -
FIG. 7d shows an energy-absorbing part in the form of a composite material, and -
FIG. 8 shows rock with a borehole for the introduction of a rock bolt. -
FIG. 1 shows arock bolt 1 according to the invention intended to be embedded in aborehole 2 in rock. Therock bolt 1 comprises an extended externaltubular part 3 and an internal extended energy-absorbingpart 4. In one preferred embodiment, theexternal part 3 has been given a length that is somewhat less than the length of the energy-absorbingpart 4. The externaltubular part 3 has afirst end 5 and asecond end 6, and a magnitude that allows the energy-absorbingpart 4 to be surrounded by theexternal part 3. It is an advantage if theexternal part 3 has circular cross-section in the form of a circularly symmetrical metal tube, but it should be realised that also other forms and materials are possible. Square, elliptical or rectangular tubes, of metal, plastic or composite material can, for example, be used. Also other forms of the externaltubular part 3 can be used. - The
jacket 7 of the externaltubular part 3 is, as is shown inFIGS. 6a-6c , arranged with a friction-increasing structure, for example in the form of apattern 8. Thejacket 7 may be arranged with lugs 9, in the same manner as the lugs on a commonly occurring reinforcement member. Thejacket 7 also may be arranged withperforations 10, or with various combinations of pattern, lugs and perforations. The purpose of the friction-increasing structure is to give a better attachment surface in the concrete into which thebolt 1 has been embedded. If thejacket 7 is provided withperforations 10, the concrete is given the possibility to grip onto thetubular part 3 without the concrete running into the tubular part and making contact with the energy-absorbingpart 4. - The internal energy-absorbing
part 4 demonstrates a length that exceeds the length of the externaltubular part 3. In one preferred embodiment, the energy-absorbingpart 4 comprises areinforcement member 4 a, but it can in other embodiments comprise awire 4 b, arod 4 c or an extended member of acomposite material 4 d, as shown inFIGS. 7a-7d . Oneend 11 of the internal energy-absorbingpart 4, the end that is intended to be located at the bottom of theborehole 2 when therock bolt 1 has been mounted, is arranged with ananchor 12 in the form of aslot 13 with awedge 14. Theslot 13 is placed in theend 11 of the energy-absorbingpart 4 in such a manner that the end has a division to a certain extent. Awedge 14 is located in theslot 13. When thebolt 1 is introduced into theborehole 2 and reaches the bottom of the borehole, thebolt 1 is pressed or beaten against the bottom of the borehole such that thewedge 14 is pressed into theslot 13. When thewedge 14 is pressed into theslot 13, the parts on the two sides of the slot are pressed outwards against the walls of the borehole and attach in this manner theend 11 of the rock bolt in theborehole 2. - The
second end 15 of the energy-absorbingpart 4 is provided with a threadedsection 16 that extends a certain distance into the energy-absorbingpart 4. The threadedsection 16 is intended to be located outside of the borehole when thebolt 1 has been introduced into thehole 2, and has a diameter that is equal to or greater than the external dimension of the outer part, as shown inFIGS. 1 and 2 . The purpose of this is to avoid any weakening of the internal energy-absorbing part caused by the thread. A screw joint 17 in the form of anut 18, awasher 19 and a force distributor in the form of ahalf sphere 20 is mounted at the threadedsection 16. When therock bolt 1 is mounted and embedded in theborehole 2, it is prestressed by the screw joint 17. The task of thehalf sphere 20 is to direct the force from the rock against thewasher 19 and thenut 18. It should be realised that, when the internal energy-absorbingpart 4 comprises awire 4 b or acomposite material 4 d, the threadedsection 16 and theanchor 12 are attached to the energy-absorbingpart - The internal energy-absorbing
part 4 is introduced into, placed inside, the externaltubular part 3. Oneend 5 of the externaltubular part 3 is attached at the internal energy-absorbingpart 4 in association with theanchor 12. Thesecond end 6 of thetubular part 3 is attached in close association with the screw joint 17, in direct association with the end of the threadedsection 16. According to one preferred embodiment, theends tubular part 3 are attached by means of welding with fully welded joins S. It should, however, be realised that another type of fastening can be used, such as gluing or other permanent fastening. Gluing is particularly appropriate when other material than steel is used for the energy-absorbingpart 4 and/or the externaltubular part 3. - In another embodiment, only the
end 5 of the tubular part is attached through welding with fully welded joins to the internal energy-absorbing part in association with theanchor 12. The length of thetubular part 3 is adapted such that itssecond end 6 comes into contact with thewasher 19 and makes contact with it when the rock bolt is prestressed. - The preferred rock bolt is mounted in the following manner as shown in
FIG. 8 : a fixing material such as concrete is introduced into theborehole 2 when it has been drilled in the rock. Therock bolt 1 is subsequently introduced into the hole with theanchor 12 entering the borehole first. When therock bolt 1 reaches the bottom, the bolt is pressed or beaten against the bottom of the borehole such that the anchor becomes attached and the bolt is fixed. When the concrete has hardened, the screw joint 17 is mounted on the part of the threadedpart 16 that protrudes from theborehole 2, and is tightened such that the energy-absorbingpart 4 is prestressed. - If resin is used instead of concrete, the
bolt 2 is provided with an anchor in the form of a stirringarrangement 21 formed by a blade or disk having the form of a paddle, instead of the wedge. When the bolt is to be mounted, the resin is introduced into the borehole, after which the bolt is introduced into the borehole and rotated such that the resin is mixed by the stirringarrangement 21. The resin hardens rapidly, which is why the screw joint 17 can be mounted and prestressed in direct association with the insertion of thebolt 1 into thehole 2. - Due to the fact that the external
tubular part 3 surrounds and encloses the energy-absorbingpart 4, the energy-absorbingpart 4 is not subject to corrosion or other influences that can weaken thebolt 1. This gives a lifetime that is longer than that of other types of embedded rock bolt. In addition, therock bolt 1 is given a maximum extent over which the bolt can be bent, since the energy-absorbingpart 4 does not come into contact with the embedding material. This gives the advantage that the rock bolt can be bent more extensively and in this way can absorb larger forces than those absorbed by other types of embedded rock bolt. - The rock bolt is manufactured in the following manner:
-
- a length and a diameter of the
hole 2 in the rock are determined, - an extended energy-absorbing
part 4 is arranged, - an extended
tubular part 3 is arranged, - the energy-absorbing
part 4 is adapted inside of thetubular part 3, - one
end 5 of thetubular part 3 is permanently attached in association with afirst end section 11 of the energy-absorbingpart 4.
- a length and a diameter of the
- A final step in the manufacture comprises
-
- the
second end 6 of thetubular part 3 being permanently attached in association with asecond end section 15 of the energy-absorbingpart 4.
- the
- According to a second embodiment described above, the final step in the manufacture comprises
-
- a screw joint 17 with a
washer 19 being arranged at asecond end section 16 of the energy-absorbing part, and thesecond end 6 of thetubular part 3 coming into contact with the washer.
- a screw joint 17 with a
- The internal dimension of the external
tubular part 3, i.e. its internal diameter in the case in which it comprises a circular pipe, exceeds the external dimension or the diameter of the energy-absorbingpart 4. The dimensions may be so adapted that the energy-absorbingpart 4 must be pressed into the externaltubular part 3, but it should be realised that it is an advantage if the externaltubular part 3 has an internal dimension that is large enough to allow the internal energy-absorbingpart 4 to move or be displaced freely relative to thetubular part 3 before the fastening, by, for example, welding or gluing. If the internal dimension of the externaltubular part 3 is sufficiently large relative to the dimension of the internal energy-absorbingpart 4, the advantage is achieved that the risk that grout comes into contact with the energy-absorbing part is minimised. - The present invention is not limited to what has been described above and shown in the drawings: it can be changed and modified in several different ways within the scope of the innovative concept defined by the attached patent claims.
Claims (16)
1. A rock bolt to be embedded in grout in a borehole, comprising an extended energy-absorbing part, the first end of the energy-absorbing part comprising an anchor and the second end of the energy-absorbing part comprising a screw joint for prestressing of the rock bolt, wherein the rock bolt comprises an extended tubular part with a jacket and a first and a second end section, and an Internal dimension of the tubular part that is larger than the external dimension of the energy-absorbing part and arranged in such a manner that it surrounds the energy-absorbing part and that the first end section of the tubular part is connected with the energy-absorbing part in association with the anchor and the second end section is arranged to make contact with a washer that is a component of the screw joint and to make contact with the washer when the rock bolt is prestressed.
2. The rock bolt according to claim 1 , whereby the tubular part extends between the anchor and the screw joint and in this way prevents the energy-absorbing part coming into contact with the grout.
3. The rock bolt according to claim 1 , whereby the end sections of the tubular part are united with the energy-absorbing part in association with the anchor and the screw joint.
4. The rock bolt according to claim 3 , whereby the tubular part is united by means of welding.
5. The rock bolt according to claim 1 , whereby the jacket of the tubular part is provided with a structure to increase friction.
6. The rock bolt according to claim 1 , whereby the jacket of the tubular part is perforated.
7. The rock bolt according to claim 1 , whereby the jacket of the tubular part is provided with lugs.
8. The rock bolt according to claim 1 , whereby the energy-absorbing part comprises a reinforcement member.
9. The rock bolt according to claim 1 , whereby the energy-absorbing part comprises a wire.
10. The rock bolt according to claim 1 , whereby the energy-absorbing part comprises a steel rod.
11. The rock bolt according to claim 1 , whereby the energy-absorbing part comprises an extended body of a composite material.
12. The rock bolt according to claim 3 , whereby the tubular part is attached by means of welding.
13. The rock bolt according to claim 1 , whereby the anchor comprises a wedge introduced Into a slot in the end of the energy-absorbing part.
14. The rock bolt according to claim 1 , whereby the anchor comprises a stirring arrangement arranged at the end of the energy-absorbing part.
15. A method for the manufacture of a rock bolt, comprising the following operational steps:
that a length and a diameter of the hole in the rock are determined,
that an extended energy-absorbing part is chosen to correspond to the length of the hole in step 1,
that an extended tubular part is chosen to correspond to the length of the hole in step 1 or the diameter of the energy-absorbing part in step 1,
that the energy-absorbing part is adapted inside of the tubular part,
that one end of the tubular part is permanently attached in association with a first end section of the energy-absorbing part,
that the second end of the tubular part is permanently attached in association with a second end section of the energy-absorbing part, and
that the first end and the second end of the energy-absorbing part are arranged with a screw joint and an anchor, respectively.
16. A method for the manufacture of a rock bolt, comprising the following operational steps:
that a length and a diameter of the hole in the rock are determined,
that an extended energy-absorbing part is chosen to correspond to the length of the hole in step 1,
that an extended tubular part is chosen to correspond to the length of the hole in step 1 or the diameter of the energy-absorbing part in step 1,
that the energy-absorbing part is adapted inside of the tubular part,
that one end of the tubular part is permanently attached in association with a first end section of the energy-absorbing part,
that the first end and the second end of the energy-absorbing part are arranged with a screw joint and an anchor, respectively, and
that a washer that is a component of the screw joint is arranged in such a manner that it makes contact with the second end of the tubular part.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1451130-7 | 2014-09-25 | ||
SE1451130A SE538335C2 (en) | 2014-09-25 | 2014-09-25 | Energy absorbing rock bolt for casting as well as the method of manufacture of such rock bolt |
PCT/SE2015/050985 WO2016056973A1 (en) | 2014-09-25 | 2015-09-22 | Rock bolt to be embedded in a fixing material, in a bore hole |
Publications (1)
Publication Number | Publication Date |
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US20170298732A1 true US20170298732A1 (en) | 2017-10-19 |
Family
ID=55653444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/514,426 Abandoned US20170298732A1 (en) | 2014-09-25 | 2015-09-22 | Rock bolt |
Country Status (15)
Country | Link |
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US (1) | US20170298732A1 (en) |
EP (1) | EP3198118A4 (en) |
CN (1) | CN106715831A (en) |
AP (1) | AP2017009847A0 (en) |
AU (1) | AU2015328736A1 (en) |
BR (1) | BR112017005961A2 (en) |
CA (1) | CA2960672A1 (en) |
CL (1) | CL2017000688A1 (en) |
CO (1) | CO2017003951A2 (en) |
EA (1) | EA201790702A1 (en) |
MX (1) | MX2017003885A (en) |
PE (1) | PE20170618A1 (en) |
SE (1) | SE538335C2 (en) |
WO (1) | WO2016056973A1 (en) |
ZA (1) | ZA201702339B (en) |
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JP6661449B2 (en) * | 2016-04-06 | 2020-03-11 | 株式会社ケー・エフ・シー | Rock bolt |
AU2020213604A1 (en) * | 2019-01-29 | 2021-08-19 | Support Technologies Innovations Pty Ltd | Rock bolt |
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US20130018592A1 (en) * | 2011-07-15 | 2013-01-17 | Pulsar Informatics, Inc. | Systems and Methods for Inter-Population Neurobehavioral Status Assessment Using Profiles Adjustable to Testing Conditions |
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2014
- 2014-09-25 SE SE1451130A patent/SE538335C2/en unknown
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2015
- 2015-09-22 US US15/514,426 patent/US20170298732A1/en not_active Abandoned
- 2015-09-22 AP AP2017009847A patent/AP2017009847A0/en unknown
- 2015-09-22 EP EP15848259.6A patent/EP3198118A4/en not_active Withdrawn
- 2015-09-22 EA EA201790702A patent/EA201790702A1/en unknown
- 2015-09-22 MX MX2017003885A patent/MX2017003885A/en unknown
- 2015-09-22 BR BR112017005961A patent/BR112017005961A2/en not_active Application Discontinuation
- 2015-09-22 CN CN201580051426.2A patent/CN106715831A/en active Pending
- 2015-09-22 CA CA2960672A patent/CA2960672A1/en not_active Abandoned
- 2015-09-22 WO PCT/SE2015/050985 patent/WO2016056973A1/en active Application Filing
- 2015-09-22 PE PE2017000560A patent/PE20170618A1/en unknown
- 2015-09-22 AU AU2015328736A patent/AU2015328736A1/en not_active Abandoned
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2017
- 2017-03-22 CL CL2017000688A patent/CL2017000688A1/en unknown
- 2017-04-03 ZA ZA2017/02339A patent/ZA201702339B/en unknown
- 2017-04-24 CO CONC2017/0003951A patent/CO2017003951A2/en unknown
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US20130018592A1 (en) * | 2011-07-15 | 2013-01-17 | Pulsar Informatics, Inc. | Systems and Methods for Inter-Population Neurobehavioral Status Assessment Using Profiles Adjustable to Testing Conditions |
Also Published As
Publication number | Publication date |
---|---|
CN106715831A (en) | 2017-05-24 |
EP3198118A4 (en) | 2018-05-16 |
MX2017003885A (en) | 2017-12-15 |
ZA201702339B (en) | 2022-05-25 |
EA201790702A1 (en) | 2017-07-31 |
BR112017005961A2 (en) | 2017-12-19 |
AP2017009847A0 (en) | 2017-03-31 |
CL2017000688A1 (en) | 2017-10-30 |
EP3198118A1 (en) | 2017-08-02 |
SE538335C2 (en) | 2016-05-24 |
PE20170618A1 (en) | 2017-05-17 |
CO2017003951A2 (en) | 2017-07-11 |
AU2015328736A1 (en) | 2017-04-27 |
CA2960672A1 (en) | 2016-04-14 |
WO2016056973A1 (en) | 2016-04-14 |
SE1451130A1 (en) | 2016-03-26 |
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Owner name: NORTHERN MINING PRODUCTS AB, SWEDEN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KREKULA, HAKAN;ERIKSSON, LEIF;REEL/FRAME:043319/0204 Effective date: 20170316 |
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