EP0265283A1 - Gebirgsanker - Google Patents
Gebirgsanker Download PDFInfo
- Publication number
- EP0265283A1 EP0265283A1 EP87309396A EP87309396A EP0265283A1 EP 0265283 A1 EP0265283 A1 EP 0265283A1 EP 87309396 A EP87309396 A EP 87309396A EP 87309396 A EP87309396 A EP 87309396A EP 0265283 A1 EP0265283 A1 EP 0265283A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bolt
- rock bolt
- leading portion
- rock
- bonding agent
- 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.)
- Withdrawn
Links
- 239000011435 rock Substances 0.000 title claims abstract description 22
- 239000007767 bonding agent Substances 0.000 description 15
- 239000000126 substance Substances 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
-
- 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
Definitions
- the present invention relates to rock bolts and more particularly but not exclusively to rock bolts as employed to support a mine roof.
- bolts are required to support the mine roof. These bolts are held in position by chemical bonding of the bolt into drilled holes in the roof's draft.
- This invention provides a rock bolt having a leading portion provided with at least one groove extending longitudinally and angularly of the bolt, said groove extending angularly about the bolt in the direction opposite to that in which the bolt is spun.
- the rock bolt has a leading edge which is chamfered so as to provide the leading portion with a frusto-conical configuration.
- a roof bolt 10 having an elongated shank 11 with a leading portion (head) 12.
- the other end of the shank 11 is threaded so as to have a threaded portion 13 which receives a tightened nut 14.
- the leading portion 12 is provided with two slots 15 which extend angularly about and longitudinally of the shank 11, preferably extending approximately 20 to 50 mm (Dimension 'A') from the leading edge 17 of the rock bolt 10. Still further, the leading portion 12 is chamfered so as to provide the leading portion 12 with a "frusto-conical" configuration. Accordingly, the leading portion 12 has sloping surfaces 16 extending angularly about the longitudinal axis of the shank 11.
- the slots 15 intersect with the sloping surfaces 16 so as to provide cutting edges 18 which aid in the breaking open of the plastic tube 19, and hence allowing the two-part bonding agent to be efficiently discharged from the plastic tube 19.
- the slots 15 extend angularly about the shank 11 in the direction opposite to that in which the rock bolt 10 is spun upon entry into the hole.
- the slots 15 provide a convenient passage for the bonding agent to move away from the end of the hole and ensures that the two-part chemi cal bonding agent is distributed longitudinally of the shank 11 in order to provide a good bond with the drilled hole.
- the slots 15 and sloping surfaces 16 can be provided in conjunction with the standard features of previously known rock bolts wherein at least one positive (or raised) ridge 19 extending longitudinally and angularly (in an opposite sense to the slot(s) 15) is/are provided along the length of the bolt up to the threaded rearward portion 13.
- the ridge(s) 19 provide a screw feed means for the bonding agent to be distributed along the length of the shank 11.
- a hole 1 is drilled in the mine roof 2. Thereafter, a two-part plastic tube 3 is inserted containing the two-part bonding agent 4.
- the roof bolt 10 is simultaneously inserted in the hole and spun. As the roof bolt 10 is spun whilst being driven longitudinally into the hole, the leading edge of the rock bolt 10 breaks the plastic tube 3 thus releasing the contents thereof when are then mixed by the leading portion 12 of the rock bolt 10. As the roof bolt 10 is spun, the combination of gravity force, a pumping action due to compressive forces on the bonding agent 4 by the bolt 10, the ridges 19, and the slots 15 causes the two parts of the chemical bonding agent 4 to be sufficiently mixed and distributed longitudinally of the shank 11 to ensure a good bond with the drilled hole 1.
- the slots 15 the ridges 19, and the bonding agent 4 adhered thereto provide the necessary resistance to longitudinal movement of the bolt 10, thus negating the need to "tighten” the bolt 10 after the bonding agent 4 is cured. It is preferably that the bonding agent 4 adheres to the surfaces of the hole 1 and the rock bolt 10.
- a ceiling retainer strip 20 may then be mounted onto the threaded rearward portion 13 of the rock bolt 10 using the retention nut 14.
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)
- Joining Of Building Structures In Genera (AREA)
- Dowels (AREA)
- Piles And Underground Anchors (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU8646/86 | 1986-10-23 | ||
AU864686 | 1986-10-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0265283A1 true EP0265283A1 (de) | 1988-04-27 |
Family
ID=3699353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87309396A Withdrawn EP0265283A1 (de) | 1986-10-23 | 1987-10-23 | Gebirgsanker |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0265283A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2323648A (en) * | 1997-03-25 | 1998-09-30 | Mai Sys Uk Ltd | Adhesively secured bolt and method of manufacture |
WO1998057035A1 (en) * | 1997-06-12 | 1998-12-17 | Steeledale Group Limited | A rock bolt |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2059535A (en) * | 1979-09-17 | 1981-04-23 | Rozanc R C | Mine roof support plate bolt |
GB2062794A (en) * | 1979-10-16 | 1981-05-28 | Upat Max Langensiepen Kg | Method of setting anchoring bolts |
US4386877A (en) * | 1979-03-28 | 1983-06-07 | Peabody Coal Company | Mine roof bolting |
GB2142998A (en) * | 1983-07-05 | 1985-01-30 | Richard Clinton Rozanc | Method of anchoring bolts in rock or concrete |
-
1987
- 1987-10-23 EP EP87309396A patent/EP0265283A1/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4386877A (en) * | 1979-03-28 | 1983-06-07 | Peabody Coal Company | Mine roof bolting |
GB2059535A (en) * | 1979-09-17 | 1981-04-23 | Rozanc R C | Mine roof support plate bolt |
GB2062794A (en) * | 1979-10-16 | 1981-05-28 | Upat Max Langensiepen Kg | Method of setting anchoring bolts |
GB2142998A (en) * | 1983-07-05 | 1985-01-30 | Richard Clinton Rozanc | Method of anchoring bolts in rock or concrete |
Non-Patent Citations (1)
Title |
---|
SOVIET INVENTIONS ILLUSTRATED, Section Mechanical, week 8441, abstract no. 255385 Q49, 21st November 1984, Derwent Publications Ltd., London, GB; & SU - A - 10 73471 (STEPANISHCHEV O N) 15-02-1984 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2323648A (en) * | 1997-03-25 | 1998-09-30 | Mai Sys Uk Ltd | Adhesively secured bolt and method of manufacture |
WO1998057035A1 (en) * | 1997-06-12 | 1998-12-17 | Steeledale Group Limited | A rock bolt |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
17P | Request for examination filed |
Effective date: 19881013 |
|
17Q | First examination report despatched |
Effective date: 19900219 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19900703 |