AU2008202943A1 - Shear bolt assembly - Google Patents
Shear bolt assembly Download PDFInfo
- Publication number
- AU2008202943A1 AU2008202943A1 AU2008202943A AU2008202943A AU2008202943A1 AU 2008202943 A1 AU2008202943 A1 AU 2008202943A1 AU 2008202943 A AU2008202943 A AU 2008202943A AU 2008202943 A AU2008202943 A AU 2008202943A AU 2008202943 A1 AU2008202943 A1 AU 2008202943A1
- Authority
- AU
- Australia
- Prior art keywords
- shear
- nut
- bolt assembly
- bolt
- shear pin
- 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 claims description 32
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- 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
- E21D21/008—Anchoring or tensioning means
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/06—Specially-shaped heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/04—Locking of screws, bolts or nuts in which the locking takes place after screwing down with a member penetrating the screw-threaded surface of at least one part, e.g. a pin, a wedge, cotter-pin, screw
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (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)
Description
S&F Ref: 864930
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: DYWIDAG-Systems International Pty Limited, an Australian company, ACN 093 424 349, of Pacific Highway, Bennett's Green, New South Wales, 2290, Australia David William Evans Spruson Ferguson St Martins Tower Level 31 Market Street Sydney NSW 2000 (CCN 3710000177) Shear bolt assembly Associated Provisional Application Details: [33] Country: [31] Appl'n No(s): [32] Application Date: 2007904075 27 Jul 2007 The following statement is a full description of this invention, including the best method of performing it known to me/us: 5845c(1301031_1) 00 1 SHEAR BOLT ASSEMBLY Technical Field The present invention relates to the field of strata control products and particularly relates to a shear bolt assembly suitable for use in resin grouted rock bolt applications.
SBackground of the Invention O A known method of installing a resin grouted rock bolt to secure the roof or wall 0 of an underground mine, tunnel or other underground excavation involves drilling a bore O hole into the rock face, inserting a two component resin filled cartridge into the bore hole io and driving the cartridge towards the top of the bore hole by way of a rock bolt inserted into the bore hole. The rock bolt pierces the resin cartridge and is then rotated, thereby mixing the two component resin, allowing it to set. Once the two component resin has set, anchoring the top of the rock bolt, the rock bolt is tensioned, typically by threading a nut along the threaded lower end portion of the rock bolt bearing the nut against a plate is washer that engages the rock face adjacent to the bore hole opening.
To enable rotation of the rock bolt during the resin mixing phase, one form of known rock bolt assembly has a nut fixed to the threaded end portion of the rock bolt by way of a shear pin extending through the -side wall of the nut and into the rock bolt. The rock bolt is rotated by moderate torque applied to the nut via the drill head of an installation rig. The shear pin locks the nut in relation to the rock bolt, preventing it from being threaded along the rock bolt at such moderate torque. Once the resin has set, a high torque is applied to the nut via the drill head of the installation rig. At this high torque, which exceeds a pre-determined "break-out" torque, the shear pin is sheared. This unlocks the nut in relation to the rock bolt, thus allowing the nut to be threadingly advanced along the rock bolt to tension the rock bolt against the plate washer and rock face.
In some applications, however, quite specific break-out torques are desired which may not closely equate to the break-out torques of any specific common size of shear pin.
Object of the Invention It is an object of the present invention to substantially overcome or at least ameliorate one or more of the above disadvantages.
AH21(1283188 1):PRW:KEH 00 2 C Summary of the Invention ZThere is disclosed herein a shear bolt assembly comprising: Cc a bolt having a threaded end portion; a nut threadingly mounted on said threaded end portion; a first shear pin extending through a side wall of said nut into said threaded end portion, said first shear pin being adapted to shear upon application of a first predetermined shear force perpendicular to a longitudinal axis of said first shear pin; and 0 a second shear pin extending through a side wall of said nut into said threaded 00 Send portion, said second shear pin being adapted to shear upon application of a second 10 pre-determined shear force perpendicular to a longitudinal axis of said second shear pin, said second pre-determined shear force being different to said first pre-determined shear force.
Typically, said bolt is a rock bolt.
In one form, said first and second shear pins extend through the same said side wall of said nut.
In another form, said first and second shear pins extend through different side walls of said shear pin.
Brief Description of the Drawings A preferred embodiment of the present invention will now be described, by way of an example only, with reference to the accompanying drawings wherein: Figure 1 is an end view of a rock bolt assembly; and Figure 2 is a front elevation view of the rock bolt assembly of Figure 1, partially cross-sectioned at section 2-2.
Detailed Description of the Preferred Embodiment Referring to the accompanying drawings, a shear bolt assembly 1 comprises a rock bolt 2 having a threaded end portion 3, a nut 4 threadingly received on the threaded end portion 3 of the rock bolt 2 and first and second shear pins 5, 6.
The first and second shear pins 5, 6 extend through a hole in the side wall 7 of the nut 4 and into the threaded end portion 3 of the rock bolt 2. Here the first and second shear pins 5, 6 extend radially into the threaded end portion 3 of the rock bolt 2 beyond the centre thereof. Whilst, in the configuration depicted, the first and second shear pins 6 extend through the same side wall 7 of the nut 4, such that the first and second shear pins 5, 6 are radially aligned, it is envisaged that the first and second shear pins 5, 6 may AJ-21(1283188 1):PRW:KEH 00 extend through separate side walls of the nut 4. The first and second shear pins 5, 6 do not protrude beyond the side wall 7 of the nut 4 such that they do not interfere with the application of the drill head of an installation rig to the nut 4.
The first and second shear pins 5, 6 have different "break-out" ratings. That is, the first shear pin 5 fails in shear under application of a first shear force perpendicular to Cc its longitudinal axis whilst the second shear pin fails upon application of a second predetermined shear force that is different to the first pre-determined shear force. In use, O such shear forces are applied to the shear pins 5, 6 at the interface between the nut 4 and 00 the threaded end portion 3 of the rock bolt 2. These different "break-out" ratings may be 0 0 1o as a result of differing diameters of the first and second shear pins 5, 6 or alternatively,
(N
different material properties of the first and second shear pins 5, 6. Differently rated shear pins may be mixed and matched as desired to achieve a particular desired overall "break-out" torque for the rock bolt assembly. It has been found that the "break-out" torque associated with the use of two shear pins is slightly greater than the sum of the individual "break-out" torque ratings of each shear pin.
The shear bolt assembly I may be installed in the same manner as described above in relation to rock bolt assemblies utilising a single shear pin.
Whilst the shear bolt assembly has been described above in relation to the specific application of a rock bolt assembly, it is envisaged that the shear bolt assembly may be utilised in other applications where it is desirable to have a nut fixed to a threaded bolt with torque up to a specific torque, and then free to threadingly advance along the thread of the bolt upon application of a high torque.
AH21(1283188 I):PRW:KEH
Claims (4)
1. A shear bolt assembly comprising: a bolt having a threaded end portion; a nut threadingly mounted on said threaded end portion; s a first shear pin extending through a side wall of said nut into said threaded end c portion, said first shear pin being adapted to shear upon application of a first pre- Cdetermined shear force perpendicular to a longitudinal axis of said first shear pin; and Sa second shear pin extending through a side wall of said nut into said threaded 00 end portion, said second shear pin being adapted to shear upon application of a second pre-determined shear force perpendicular to a longitudinal axis of said second shear pin, said second pre-determined shear force being different to said first pre-determined shear force.
2. The shear bolt assembly of claim 1 wherein said bolt is a rock bolt.
3. The shear bolt assembly of either one of claims 1 and 2, wherein said first and second shear pins extend through the same said side wall of said nut.
4. The shear bolt assembly of either one of claims 1 and 2, wherein said first and second shear pins extend through different side walls of said shear pin. A shear bolt assembly substantially as hereinbefore described with reference to the accompanying drawings. Dated 3 July, 2008 DYWIDAG-Systems International Pty Limited Patent Attorneys for the Applicants/Nominated Persons SPRUSON FERGUSON AH21(1283188 1):PRW:KEH
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2008202943A AU2008202943A1 (en) | 2007-07-27 | 2008-07-03 | Shear bolt assembly |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2007904075A AU2007904075A0 (en) | 2007-07-27 | Shear bolt assembly | |
| AU2007904075 | 2007-07-27 | ||
| AU2008202943A AU2008202943A1 (en) | 2007-07-27 | 2008-07-03 | Shear bolt assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2008202943A1 true AU2008202943A1 (en) | 2009-02-12 |
Family
ID=40364157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2008202943A Abandoned AU2008202943A1 (en) | 2007-07-27 | 2008-07-03 | Shear bolt assembly |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2008202943A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014022633A1 (en) * | 2012-08-03 | 2014-02-06 | Tyco Electronics Corporation | Controlled torque fasteners and methods for using same |
| EP2846052A1 (en) * | 2013-09-06 | 2015-03-11 | Thomas & Betts International, LLC | Torque controlling break screw |
| EP2913477A3 (en) * | 2014-02-18 | 2016-07-13 | Mine Support Products (pty) Ltd | Rock bolt |
| CN113374514A (en) * | 2021-07-07 | 2021-09-10 | 太原理工大学 | Method for controlling staggered-layer internal-staggered gob-side entry driving surrounding rock by anchor grouting technology |
| US11276946B2 (en) | 2019-03-21 | 2022-03-15 | TE Connectivity Services Gmbh | Cable connector system and a method of connecting electrical cables |
| CN116906428A (en) * | 2023-07-31 | 2023-10-20 | 包头钢铁（集团）有限责任公司 | A split T-bolt and its use method |
-
2008
- 2008-07-03 AU AU2008202943A patent/AU2008202943A1/en not_active Abandoned
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9388840B2 (en) | 2012-08-03 | 2016-07-12 | Tyco Electronics Corporation | Controlled torque fasteners and methods for using same |
| US8875368B2 (en) | 2012-08-03 | 2014-11-04 | Tyco Electronics Corporation | Controlled torque fasteners and methods for using same |
| CN104685228B (en) * | 2012-08-03 | 2016-12-07 | 泰科电子有限公司 | Controlled torque securing member and the method being used for using it |
| WO2014022633A1 (en) * | 2012-08-03 | 2014-02-06 | Tyco Electronics Corporation | Controlled torque fasteners and methods for using same |
| CN104685228A (en) * | 2012-08-03 | 2015-06-03 | 泰科电子有限公司 | Controlled torque fastener and method for using same |
| JP2015052392A (en) * | 2013-09-06 | 2015-03-19 | トーマス アンド ベッツ インターナショナル，エルエルシー | Torque controlling break screw |
| US9366282B2 (en) | 2013-09-06 | 2016-06-14 | Thomas & Betts International Llc | Torque controlling break screw |
| EP2846052A1 (en) * | 2013-09-06 | 2015-03-11 | Thomas & Betts International, LLC | Torque controlling break screw |
| EP2913477A3 (en) * | 2014-02-18 | 2016-07-13 | Mine Support Products (pty) Ltd | Rock bolt |
| US11276946B2 (en) | 2019-03-21 | 2022-03-15 | TE Connectivity Services Gmbh | Cable connector system and a method of connecting electrical cables |
| CN113374514A (en) * | 2021-07-07 | 2021-09-10 | 太原理工大学 | Method for controlling staggered-layer internal-staggered gob-side entry driving surrounding rock by anchor grouting technology |
| CN113374514B (en) * | 2021-07-07 | 2022-11-25 | 太原理工大学 | Method for controlling staggered-layer internal-staggered gob-side entry driving surrounding rock by anchor grouting technology |
| CN116906428A (en) * | 2023-07-31 | 2023-10-20 | 包头钢铁（集团）有限责任公司 | A split T-bolt and its use method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted |