AU2015202429B2 - A rock bolt installation and method of installing a rock bolt - Google Patents
A rock bolt installation and method of installing a rock bolt Download PDFInfo
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- AU2015202429B2 AU2015202429B2 AU2015202429A AU2015202429A AU2015202429B2 AU 2015202429 B2 AU2015202429 B2 AU 2015202429B2 AU 2015202429 A AU2015202429 A AU 2015202429A AU 2015202429 A AU2015202429 A AU 2015202429A AU 2015202429 B2 AU2015202429 B2 AU 2015202429B2
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- rock bolt
- bore hole
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Abstract
A ROCK BOLT INSTALLATION AND METHOD OF INSTALLING A A rock bolt installation has a bore hole (1) formed in a rock face (2) with a rock bolt (100) located within the bore hole (1). The rock bolt leading end (101) is located adjacent the blind end (4) of the bore hole (1) and the rock bolt trailing end (102) projects from the bore hole (1). An annulus (5) is defined between the rock bolt (100) and the bore hole wall (6). Resin (200) is located in a leading region of the annulus (5) and encapsulates a leading portion of the rock bolt (100) to define an encapsulated length (A) of the rock bolt (100). The resin (200) bonds the encapsulated length (A) of the rock bolt (100) to the bore hole wall (6). A trailing region of the annulus (5) between the encapsulated length (A) and the rock face (2) is substantially free of resin and defines a free length (B) of the rock bolt (100). The encapsulated length (A) constitutes between 50% and 90% of the length of the bore hole (1). b Do 'A $ 20 l Ag
Description
A ROCK BOLT INSTALLATION AND METHOD OF INSTALLING A
ROCK BOLT
Field [0001] The present invention relates to strata control in civil engineering and mining operations, and in particular relates to a rock bolt installation and method of installing a rock bolt for securing the roof or wall of a mine, tunnel or other ground excavation.
Background [0002] A known method of stabilising the wall or roof of an underground mine is to secure a rock bolt into a bore hole drilled in to the face of the rock to be stabilised. Two forms of rock bolt installation are point-anchored rock bolt installations and fully encapsulated rock bolt installations.
[0003] In a point-anchored rock bolt installation, depicted in Figure 1, a bore hole 1 is first drilled into a rock face 2 of a rock strata 3 to be stabilised. For a resin point-anchored rock bolt installation, a sausage-like two-component resin filled cartridge is then inserted into the bore hole 1, followed by the rock bolt 100 which pushes the resin filled cartridge toward the blind end 4 of the bore hole 100. The rock bolt 100 is then rotated as it is thrust upwardly to shred the frangible cartridge casing and mix the resin component 200. Thrusting and rotation of the rock bolt 100 is then ceased, allowing the resin 200 to cure, in a leading region of the annulus 5 defined between the rock bolt 100 and the bore hole wall 6. The resin 200 encapsulates a leading portion of the rock bolt 100, bonding a short encapsulated length A of the rock bolt 100 to the bore hole wall 6, forming a point anchor. For such a point anchored installation, sufficient resin is provided so as to encase, and thus point-anchor, a relatively short length of the rock bolt 100, typically of the order of 300 to 500 mm, toward the blind end of the bore hole 1. The remaining length B of the rock bolt 100 (referred to in the art as the “free length”), constituting the majority of the length of the rock bolt 100, remains un-encapsulated and accordingly does not provide for load transfer between the free length B and the bore hole wall 6. The rock bolt 100 is then typically pre-tensioned, such as by driving a drive nut 110 along the trailing threaded portion 103 of the rock bolt against a plate washer 120 mounted on the rock bolt 100 and bearing against the
AH25(10003503_l ):dah
2015202429 06 May 2015 rock face 2. Rather than resin point anchoring the rock bolt 100, another form of point-anchored rock bolt installation involves the use of a mechanical anchor at the bolt leading end.
[0004] In a fully encapsulated rock bolt installation, depicted in Figure 2, substantially the entire length of the rock bolt 100 is bonded to the bore hole wall 6, proving an encapsulation length A close to the full length of the bore hole 1 and leaving only a minimal (or no) free length B, by substantially entirely filling the annulus 5 between the rock bolt 100 and the bore hole wall 6 with resin 200. As with a resin point-anchored rock bolt installation, a fully encapsulated rock bolt installation is installed with the use of a two-component resin filled cartridge that is inserted into the bore hole 1, followed by the rock bolt 100, which is rotated as it is thrust upwardly to shred the frangible cartridge casing and mix the resin component 200. Sufficient resin 200 is provided to fully encapsulate the rock bolt 100 within the bore hole 1. For installations where pre-tensioning of the rock bolt 100 is not required, a single form of resin may be utilised. For installations where pre-tensioning is desired, the resin filled cartridge 4 may contain two separate resins, with a faster setting resin 201 (referred to as a “high speed” resin) located toward the blind end of the bore hole 1 and a slower setting resin 202 (referred to as a “slow speed” resin) located beneath the faster setting resin. In this configuration, the rock bolt 160 may be pretensioned in the manner discussed above when the faster setting resin 201 has cured, but before the slower setting resin, which encapsulates the bulk of the length of the rock bolt 100, has fully cured.
[0005] The present inventors have identified the following potential disadvantages of pointanchored rock bolt installations:
(i) should any strata yield or strata “fretting” occur in the vicinity of the plate washer, the applied pre-tension may be significantly reduced if not entirely dissipated, this acting to substantially reduce the effectiveness of the installed rock bolt;
(ii) in the case of a resin point-anchor, should resin be lost along open bedding planes near the blind end of the bore hole, the encapsulated length may be reduced in length such that it is (a) insufficient to allow the desired level of pre-tension to be applied and/or (b) insufficient to allow the full rock bolt strength to be developed in response to subsequent strata movement; and (iii) a long free length may result in a low overall load transfer stiffness (i.e. bolt load generated in response to strata movement) of the rock bolt installation compared to a fully encapsulated rock bolt installation, high load transfer stiffness leading to increased rock bolt reinforcing effectiveness.
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2015202429 06 May 2015 [0006] The present inventors have identified the following potential disadvantages with fully encapsulated rock bolt installations:
(i) the timing of the drive nut being tightened and the rock bolt pre-tensioned is critical when using a two-speed resin system, however this does not always occur in practice for any number of operational reasons. Therefore rock bolt pre-tensioning inevitably occurs with the full resin column having cured, this substantially reducing the effectiveness of the pre-tension due to the limited free length over which it is applied;
(ii) even if the drive nut is tightened at the correct time in terms of slow speed resin curing, research work now indicates that even partially cured slow speed resin near the trailing end of the rock bolt will inevitably act to prevent the applied pre-tension being distributed along much of the rock bolt length containing slow speed resin. Again, this acts to reduce the overall effectiveness of the applied bolt pre-tension and so reduces the effectiveness of the rock bolt installation;
(iii) full encapsulation requires that a substantial amount of resin is inserted into the bore hole before the rock bolt, with the rock bolt needing to be rotated and thrust through that resin as part of its installation. In conjunction with the use of a thin annulus around the rock bolt and rapid bolt insertion (as would be the case when using a mounted hydraulic rock bolting machine), very high (50 MPa has been measured in published research studies) back-pressures may be generated within the resin well before the rock bolt reaches the blind end of the bolt hole. Such resin pressures may be sufficient to initiate strata fracturing (that otherwise would not exist), further open and drive resin into pre-existing fractures (thus reducing rock bolt encapsulation) and also act to promote resin un-mixing and gloving (large sections of cartridge becoming wrapped around the bolt) in the leading portion of the rock bolt, particularly when resin systems are used that incorporate small amounts (a few % of the total resin volume) of resin catalyst located at the outer extremity of the resin filled cartridge.
Object of the Invention [0007] It is an object of the present invention to substantially overcome or at least ameliorate at least one of the above disadvantages.
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2015202429 06 May 2015
Summary of Invention [0008] In a first aspect the present invention provides a rock bolt installation comprising:
a bore hole formed in a rock face and having a blind end and a bore hole wall;
a rock bolt longitudinally extending from a rock bolt leading end to a rock bolt trailing end, said rock bolt being located within said bore hole with said rock bolt leading end located adjacent said blind end of said bore hole and said rock bolt trailing end projecting from said bore hole, an annulus being defined between said rock bolt and said bore hole wall; and resin located in a leading region of said annulus and encapsulating a leading portion of said rock bolt to define an encapsulated length of said rock bolt, said resin bonding said encapsulated length of said rock bolt to said bore hole wall;
wherein a trailing region of said annulus between said encapsulated length and said rock face is substantially free of resin and defines a free length of said rock bolt; and said encapsulated length constitutes between 50% and 90% of the length of said bore hole.
[0009] Typically, said rock bolt is pre-tensioned.
[0010] In a preferred form, said encapsulated length constitutes between 55% and 85% of the length of said bore hole, and in one form between 55% and 80%.
[0011] In one form, said free length is between 0.5 m and 0.6 m.
[0012] In one form, said encapsulated length is at least 1.0 m.
[0013] Typically, said encapsulated length is between 0.6 m and 1.9 m.
[0014] In one embodiment, said rock bolt has a length of approximately 1.2 m and said encapsulated length is between 0.6 m and 0.9 m.
[0015] In another embodiment, said rock bolt has a length of approximately 2.4 m and said encapsulated length is between 1.2 m and 1.9 m.
AH25(10003503_l ):dah
2015202429 06 May 2015 [0016] In a preferred form, said rock bolt comprises a rigid steel bar with a threaded trailing portion and a drive nut threadingly mounted onto said threaded trailing portion, said drive nut pre-tensioning said rock bolt.
[0017] Typically, said rock bolt installation further comprises a plate washer mounted on said rock bolt between said drive nut and said rock face and a dome washer mounted on said rock bolt between said drive nut and said plate washer, said drive nut transferring loads from said rock bolt to said rock face via said dome washer and said plate washer.
[0018] In a second aspect the present invention provides a method of installing a rock bolt comprising:
drilling a bore hole into a rock face, said bore hole having a blind end and a bore hole wall;
inserting a rock bolt into said bore hole with a leading end of said rock bolt leading, to define an annulus between said rock bolt and said bore hole wall;
encapsulating a leading portion of said rock bolt with resin in a leading region of said annulus to define an encapsulated length of said rock bolt; and curing said resin to bond said encapsulated length to said bore hole wall;
wherein a trailing region of said annulus defined between said encapsulated length and said rock face is substantially free of resin to define a free length of said rock bolt; and said encapsulated length constitutes between 50% and 90% of the length of said bore hole.
[0019] In a preferred form, said method further comprises:
inserting a two-component resin filled cartridge having a frangible casing into said bore hole;
whilst inserting said rock bolt into said bore hole, thrusting said rock bolt toward said blind end of said bore hole and rotating said rock bolt;
puncturing said frangible casing, allowing said resin to flow along said leading region of said annulus whilst being mixed by rotation of said rock bolt; and allowing said resin to cure in said leading region of said annulus.
[0020] Typically, said method further comprises pre-tensioning said rock bolt.
AH25(10003503_l ):dah
2015202429 06 May 2015 [0021] Typically, said rock bolt is pre-tensioned by threadingly mounting a drive nut on a threaded trailing portion of said rock bolt and driving said drive nut along said threaded trailing portion, transferring load from said drive nut to said rock face via a plate washer and dome nut mounted on said rock bolt.
[0022] In a preferred form, said encapsulated length constitutes between 55% and 80% of the length of said bore hole.
[0023] In one form, said free length is between 0.5 m and 0.6 m.
[0024] In one form, said encapsulated length is at least 1.0 m.
[0025] Typically, said encapsulated length is between 0.6 m and 1.9 m.
[0026] In one embodiment, said rock bolt has a length of approximately 1.2 m and said encapsulated length is between 0.6 m and 0.9 m.
[0027] In another embodiment, said rock bolt has a length of approximately 2.4 m and said encapsulated length is between 1.2 m and 1.9 m.
Brief Description of Drawings [0028] A preferred embodiment of the present invention will now be described, by way of an example only, with reference to the accompanying drawings wherein:
Fig. 1 is a partially cross-sectioned view of a prior art resin point-anchored rock bolt installation;
Fig. 2 is a partially cross-sectioned view of a prior art fully encapsulated rock bolt installation;
Fig. 3 is a partially cross-sectioned view of a partially installed rock bolt installation according to a first embodiment;
Fig. 4 is a partially cross-sectioned view of a completed rock bolt installation according to the first embodiment.
AH25(10003503_l ):dah
2015202429 06 May 2015
Description of Embodiments [0029] Referring to Figures 3 and 4 of the accompanying drawings, a rock bolt installation according to a preferred embodiment is formed by firstly drilling a bore hole 1 into a rock face 2 of a rock strata 3 to be stabilised in the usual manner. The bore hole 1 has a blind end 4 and a cylindrical bore hole wall 6. A sausage-like two-component resin filled cartridge 203 is then inserted into the bore hole 1. The resin filled cartridge 203 is followed by a rock bolt 100, which longitudinally extends between a rock bolt leading end 101 and a rock bolt trailing end 102. The rock bolt 100 will typically be in the form of a rigid steel bar with a threaded trailing end portion 103. The rock bolt 100 is inserted with the rock bolt leading end 101 leading. The rock bolt 100 is thrust toward the blind end 4 of the bore hole 1, pushing the resin filled cartridge 203 toward the blind end 4 of the bore hole 1. Whilst the rock bolt 100 is thrust toward the blind end 4, it is also rotated. The thrust and rotation of the rock bolt 100 punctures the frangible casing of the resin-filled cartridge 203, allowing resin 200 to flow along the annulus 5 defined between the rock bolt 100 and the bore hole wall 6 as it is mixed by rotation of the rock bolt 100. When the rock bolt 100 reaches adjacent the blind end 4 of the bore hole 1, thrusting and rotation of the rock bolt 100 is stopped, allowing the resin to cure. Alternatively, rotation of the rock bolt 100 may be continued whilst the resin 200 cures. Whilst curing, the resin 200 grips the rock bolt 100 such that the torque applied exceeds a “break out” torque of a drive nut 110 mounted on the threaded trailing portion 103 of the rock bolt 100, resulting in the drive nut 110 advancing along the threaded trailing portion 103 to pre-tension the rock bolt 100, as will be discussed further below.
[0030] The resin cures in a leading region of the annulus 5 to encapsulate a leading end portion of the rock bolt 100 to define an encapsulated length A of the rock bolt 100. A trailing region of the annulus 5 between the encapsulated length A and the rock face 2 is left substantially free of resin 200, so as to define a free length B of the rock bolt 100. Sufficient resin is provided such that the encapsulated length A constitutes between 50% and 90% of the length of the bore hole 1. The rock bolt installation is thus neither a point-anchored installation nor a fully encapsulated installation, instead constituting a majority encapsulated rock bolt installation.
[0031] In preferred forms, the encapsulated length A may typically constitute between 55% and 85% of the length of the bore hole 1 and in one form between 55% and 80%. In a preferred
AH25(10003503_l ):dah
2015202429 06 May 2015 form, the encapsulated length A may be at least 1.0 m, whilst leaving a free length B of between
0.5 m and 0.6 m.
[0032] Industry standard rock bolt lengths are typically within the range of 1.2 m to 2.4 m, in 300 mm increments. The length of the bore hole 1 is typically approximately 100 mm less than the rock bolt length, allowing for the rock bolt trailing end 102 to project approximately 100 mm from the bore hole 1.
[0033] For a short typical rock bolt length of 1.2 m, which would typically have a bore hole length of 1.1 m (leaving a 0.1 m tail projecting from the bore hole 1), the encapsulated length A may, in a preferred form, be between 0.6 m and 0.9 m. For a long standard rock bolt length of
2.4 m, a bore hole length of approximately 2.3 m would be typical, and the encapsulated length A may, in a preferred form, be between 1.2 m and 1.9m.
[0034] In one example, the length of the rock bolt 100 is 1.5 m, the length of the bore hole 1 is
1.4 m, the encapsulation length A is 0.8 m (equating to 57% of the bore hole length) and the free length B is 0.6 m.
[0035] In another example, the rock bolt length is 1.5 m, the bore length is 1.4 m, the encapsulation length A is 1.1 m (equating to 79% of the bore hole length) and the free length B is 0.3 m.
[0036] In a third example, the length of the rock bolt 100 is 1.8 m, the length of the bore hole 1 is 1.7 m, the encapsulation length A is 1.1 m (equating to 65% of the bore hole length) and the free length B is 0.6 m.
[0037] In a fourth example, the length of the rock bolt 100 is 1.8 m, the length of the bore hole 1 is 1.7m, the encapsulation length A is 1.3 m (equating to 76% of the bore hole length) and the free length B is 0.4m.
[0038] Once the resin 200 has cured, the rock bolt 100 may be pre-tensioned. In one example, the rock bolt 100 may be pre-tensioned by way of the drive nut 110 mounted on the threaded trailing portion 103 of the rock bolt 100, which transfers loads to the rock face 2 by way of a standard plate washer 120 and dome washer 130 mounted on the rock bolt 100 adjacent the drive nut 110 between the drive nut 110 and the rock bolt leading end 101 Driving the drive nut 110
AH25(10003503_l ):dah
2015202429 06 May 2015 along the threaded trailing portion 103 of the rock bolt 100 pre-tensions the free length B of the rock bolt 100. As noted above, the drive nut 110 may be driven along the threaded trailing portion 103 by continuing rotation of the rock bolt 100 throughout the curing process.
Alternatively, driving of the drive nut 110 may be a separate action after curing of the resin 200.
[0039] Having an encapsulated length of at least 50% of the length of the bore hole 1, at least according to a preferred embodiment, may provide for a very reliable anchorage against which the drive nut 110 can be tightened to generate pre-tension. Such an encapsulated length A may also be sufficiently long to directly reinforce the strata 3 via load transfer as a result of any strata movements after installation of the rock bolt 100.
[0040] Having the free length A extend over at least 10% of the length of the bore hole 1 may reduce the amount of resin as compared to a fully encapsulated rock bolt installation, thereby potentially reducing development of high resin back pressures during rock bolt installation and potentially decreasing the potential for strata fracturing due to resin pressures, resin loss along open fractures and resin un-mixing/gloving toward the blind end 4 of the bore hole 1.
[0041] Ensuring that the free length A of the rock bolt 100 constitutes at least 10% of the length of the bore hole, the drive nut 110 may be tightened at any time after curing of the resin 200 (which will typically be a fast setting resin, but is also envisaged to include both fast and slow setting resin components), providing a predictable result that may reliably pre-tension the unencapsulated free length A. According to at least preferred embodiments, this will cause the rock bolt 100 to generate a “clamped” end condition over the encapsulated length A with the immediate strata surrounding the bore hole wall 6, as compared to the largely “pinned” end condition that is inevitably generated with a fully encapsulated rock bolt installation if pretension has been applied incorrectly after curing of the slow setting resin. Such clamped end conditions may result in a four-fold increase in associated beam strength and stiffness as compared to a pinned end.
[0042] Leaving a free length B of at least 10% of the length of the bore hole 1 also avoids the requirement for a two speed resin system, as is typically utilized with a fully encapsulated rock bolt installation, allowing the drive nut 110 to be tightened at any time after setting of the typically fast setting resin. A two speed resin system may, however, still be utilised if desired.
AH25(10003503_l ):dah ίο [0043] It is also envisaged that other forms of rock bolt installation, including self-drilling rock bolts, hollow bolts, fibreglass bolts or cable bolts, may be installed with encapsulation lengths as discussed above. A person skilled in the art will also readily appreciate various other modifications and applications of the present invention.
2015202429 06 May 2015
Claims (16)
- 2015202429 06 May 20151. A rock bolt installation comprising:a bore hole formed in a rock face and having a blind end and a bore hole wall;a rock bolt longitudinally extending from a rock bolt leading end to a rock bolt trailing end, said rock bolt being located within said bore hole with said rock bolt leading end located adjacent said blind end of said bore hole and said rock bolt trailing end projecting from said bore hole, an annulus being defined between said rock bolt and said bore hole wall; and resin located in a leading region of said annulus and encapsulating a leading portion of said rock bolt to define an encapsulated length of said rock bolt, said resin bonding said encapsulated length of said rock bolt to said bore hole wall;wherein a trailing region of said annulus between said encapsulated length and said rock face is substantially free of resin and defines a free length of said rock bolt; and said encapsulated length constitutes between 50% and 90% of the length of said bore hole.
- 2. The rock bolt installation of claim 1 wherein said rock bolt is pre-tensioned.
- 3. The rock bolt installation of either one of claims 1 and 2 wherein said encapsulated length constitutes between 55% and 80% of the length of said bore hole.
- 4. The rock bolt installation of either one of claims 1 and 2 wherein said free length is between 0.5 m and 0.6 m.
- 5. The rock bolt installation of claim 4 wherein said encapsulated length is at least 1.0 m.
- 6. The rock bolt installation of any one of claims 1 to 4 wherein said encapsulated length is between 0.6 m and 1.9 m.
- 7. The rock bolt installation of any one of claims 1, 2, 4 and 5 wherein said rock bolt comprises a rigid steel bar with a threaded trailing portion and a drive nut threadingly mounted onto said threaded trailing portion, said drive nut pre-tensioning said rock bolt.
- 8. The rock bolt installation of claim 7 wherein said rock bolt installation further comprises a plate washer mounted on said rock bolt between said drive nut and said rock face and a dome washer mounted on said rock bolt between said drive nut and said plate washer, said drive nutAH25(10003503_l ):dah2015202429 06 May 2015 transferring loads from said rock bolt to said rock face via said dome washer and said plate washer.
- 9. A method of installing a rock bolt comprising:drilling a bore hole into a rock face, said bore hole having a blind end and a bore hole wall; inserting a rock bolt into said bore hole with a leading end of said rock bolt leading, to define an annulus between said rock bolt and said bore hole wall;encapsulating a leading portion of said rock bolt with resin in a leading region of said annulus to define an encapsulated length of said rock bolt; and curing said resin to bond said encapsulated length to said bore hole wall;wherein a trailing region of said annulus defined between said encapsulated length and said rock face is substantially free of resin to define a free length of said rock bolt; and said encapsulated length constitutes between 50% and 90% of the length of said bore hole.
- 10. The method of claim 9 further comprising:inserting a two-component resin filled cartridge having a frangible casing into said bore hole;whilst inserting said rock bolt into said bore hole, thrusting said rock bolt toward said blind end of said bore hole and rotating said rock bolt;puncturing said frangible casing, allowing said resin to flow along said leading region of said annulus whilst being mixed by rotation of said rock bolt; and allowing said resin to cure in said leading region of said annulus.
- 11. The method of either one of claims 9 and 10 further comprising pre-tensioning said rock bolt.
- 12. The method of claim 11 wherein said rock bolt is pre-tensioned by threadingly mounting a drive nut on a threaded trailing portion of said rock bolt and driving said drive nut along said threaded trailing portion, transferring load from said drive nut to said rock face via a plate washer and dome nut mounted on said rock bolt.
- 13. The method of any one of claim 9 to 12 wherein said encapsulated length constitutes between 55% and 80% of the length of said bore hole.AH25(10003503_l ):dah2015202429 06 May 2015
- 14. The method of any one of claims 9 to 12 wherein said free length is between 0.5 m and 0.6m.
- 15. The method of claim 14 wherein said encapsulated length is at least 1.0 m.
- 16. The method of any one of claims 9 to 14 wherein said encapsulated length is between 0.6 m and 1.9 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2015202429A AU2015202429B2 (en) | 2014-05-06 | 2015-05-06 | A rock bolt installation and method of installing a rock bolt |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2014901652 | 2014-05-06 | ||
| AU2014901652A AU2014901652A0 (en) | 2014-05-06 | A modified rock bolting system that optimises reinforcing effectiveness and eliminates various detrimental aspects of currently used systems | |
| AU2015202429A AU2015202429B2 (en) | 2014-05-06 | 2015-05-06 | A rock bolt installation and method of installing a rock bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2015202429A1 AU2015202429A1 (en) | 2016-01-07 |
| AU2015202429B2 true AU2015202429B2 (en) | 2019-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2015202429A Active AU2015202429B2 (en) | 2014-05-06 | 2015-05-06 | A rock bolt installation and method of installing a rock bolt |
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| AU (1) | AU2015202429B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106223368B (en) * | 2016-08-30 | 2018-06-29 | 安徽建工集团有限公司 | Glass fibre prestressed anchor anchor structure, its loading device and loading method |
| CN113268801B (en) * | 2021-06-04 | 2022-09-06 | 中铁隧道局集团有限公司 | Tunnel surrounding rock supporting method and system based on tunnel field solution reconstruction theory |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4664561A (en) * | 1986-08-12 | 1987-05-12 | The Eastern Co. | Combined resin-mechanical mine roof bolt anchor |
| US5052861A (en) * | 1990-04-16 | 1991-10-01 | H&S Machine & Supply Co., Inc. | Roof bolt with plastic sleeve and mechanical anchor |
| CA2206909A1 (en) * | 1997-06-04 | 1998-12-04 | Colin Grindle | Resin dam for an anchoring bolt |
-
2015
- 2015-05-06 AU AU2015202429A patent/AU2015202429B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4664561A (en) * | 1986-08-12 | 1987-05-12 | The Eastern Co. | Combined resin-mechanical mine roof bolt anchor |
| US5052861A (en) * | 1990-04-16 | 1991-10-01 | H&S Machine & Supply Co., Inc. | Roof bolt with plastic sleeve and mechanical anchor |
| CA2206909A1 (en) * | 1997-06-04 | 1998-12-04 | Colin Grindle | Resin dam for an anchoring bolt |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2015202429A1 (en) | 2016-01-07 |
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| DA3 | Amendments made section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS: AMEND THE PRIORITY DETAILS TO READ 2014901652 06 MAY 2014 AU |
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| FGA | Letters patent sealed or granted (standard patent) | ||
| HB | Alteration of name in register |
Owner name: DSI UNDERGROUND AUSTRALIA PTY LIMITED Free format text: FORMER NAME(S): DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED; MINE ADVICE RESEARCH PTY LTD Owner name: MINE ADVICE RESEARCH PTY LTD Free format text: FORMER NAME(S): DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED; MINE ADVICE RESEARCH PTY LTD |