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 surface

Info

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
Application number
FR7318525A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LEMAIRE JOSEPH FR
Original Assignee
LEMAIRE JOSEPH FR
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LEMAIRE JOSEPH FR filed Critical LEMAIRE JOSEPH FR
Priority to FR7318525A priority Critical patent/FR2231233A5/en
Application granted granted Critical
Publication of FR2231233A5 publication Critical patent/FR2231233A5/en
Expired legal-status Critical Current

Links

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.
FR7318525A 1973-05-22 1973-05-22 Anchor bolt for underground rock faces - has two ribbed half shells expanded by nut with frusto-conical surface Expired FR2231233A5 (en)

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)

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Legal Events

Date Code Title Description
ST Notification of lapse