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FR1009316A - Steel crown cap for tunnel operation - Google Patents

Steel crown cap for tunnel operation

Info

Publication number
FR1009316A
FR1009316A FR1009316DA FR1009316A FR 1009316 A FR1009316 A FR 1009316A FR 1009316D A FR1009316D A FR 1009316DA FR 1009316 A FR1009316 A FR 1009316A
Authority
FR
France
Prior art keywords
crown cap
tunnel operation
steel crown
steel
tunnel
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
Other languages
French (fr)
Inventor
August Fischer
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 filed Critical
Application granted granted Critical
Publication of FR1009316A publication Critical patent/FR1009316A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/01—Caps for supporting mine roofs characterised by the shape of the cap, e.g. of specified cross-section
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • E21D17/04—Cantilever extension or similar protecting devices for use in longwall working
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • E21D17/08—Cap joints for obtaining a coal-face free of pit-props
    • E21D17/082—Cap joints for obtaining a coal-face free of pit-props of sliding type
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • E21D17/08—Cap joints for obtaining a coal-face free of pit-props
    • E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
FR1009316D 1948-06-04 1948-06-04 Steel crown cap for tunnel operation Expired FR1009316A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1009316T 1948-06-04

Publications (1)

Publication Number Publication Date
FR1009316A true FR1009316A (en) 1952-05-28

Family

ID=9568065

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1009316D Expired FR1009316A (en) 1948-06-04 1948-06-04 Steel crown cap for tunnel operation

Country Status (1)

Country Link
FR (1) FR1009316A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1013246B (en) * 1953-01-13 1957-08-08 Ewald Wiemann Maschf Metal cap with a profile open at the bottom

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1013246B (en) * 1953-01-13 1957-08-08 Ewald Wiemann Maschf Metal cap with a profile open at the bottom

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