FR2231233A5 - Anchor bolt for underground rock faces - has two ribbed half shells expanded by nut with frusto-conical surface - Google Patents
Anchor bolt for underground rock faces - has two ribbed half shells expanded by nut with frusto-conical surfaceInfo
- Publication number
- FR2231233A5 FR2231233A5 FR7318525A FR7318525A FR2231233A5 FR 2231233 A5 FR2231233 A5 FR 2231233A5 FR 7318525 A FR7318525 A FR 7318525A FR 7318525 A FR7318525 A FR 7318525A FR 2231233 A5 FR2231233 A5 FR 2231233A5
- Authority
- FR
- France
- Prior art keywords
- bolt
- nut
- frusto
- expanded
- conical surface
- 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.)
- Expired
Links
- 239000011435 rock Substances 0.000 title abstract 3
- 238000005192 partition Methods 0.000 abstract 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
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)
- Dowels (AREA)
Abstract
The bolt is intended to provide an anchor in an underground rock face to which may be attached a partition or roof lining. The bolt is inserted in a hole drilled in the rock face. The length of the bolt is such that it can give a good grip. The part of the bolt that is inserted in the hole comprises two ribbed shells (2). At the top of the bolt there is a nut (1) under which is a collar. There is a further collar (3) around the bolt. When the nut is tightened the shells are forced apart thereby causing them to grip the sides of the hole. The nut and internal surface of the bolt have cooperating tapering faces.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7318525A FR2231233A5 (en) | 1973-05-22 | 1973-05-22 | Anchor bolt for underground rock faces - has two ribbed half shells expanded by nut with frusto-conical surface |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7318525A FR2231233A5 (en) | 1973-05-22 | 1973-05-22 | Anchor bolt for underground rock faces - has two ribbed half shells expanded by nut with frusto-conical surface |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2231233A5 true FR2231233A5 (en) | 1974-12-20 |
Family
ID=9119753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7318525A Expired FR2231233A5 (en) | 1973-05-22 | 1973-05-22 | Anchor bolt for underground rock faces - has two ribbed half shells expanded by nut with frusto-conical surface |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2231233A5 (en) |
-
1973
- 1973-05-22 FR FR7318525A patent/FR2231233A5/en not_active Expired
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |