GB723528A - Improvements in yieldable pit props - Google Patents

Improvements in yieldable pit props

Info

Publication number
GB723528A
GB723528A GB13003/51A GB1300351A GB723528A GB 723528 A GB723528 A GB 723528A GB 13003/51 A GB13003/51 A GB 13003/51A GB 1300351 A GB1300351 A GB 1300351A GB 723528 A GB723528 A GB 723528A
Authority
GB
United Kingdom
Prior art keywords
yieldable
pit
pit props
channel
props
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
GB13003/51A
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.)
fur VERWERTUNGEN und INVESTITI
Original Assignee
fur VERWERTUNGEN und INVESTITI
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 fur VERWERTUNGEN und INVESTITI filed Critical fur VERWERTUNGEN und INVESTITI
Publication of GB723528A publication Critical patent/GB723528A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14—Lining predominantly with metal
    • E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
    • E21D11/20—Special cross- sections, e.g. corrugated

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Adjustment And Processing Of Grains (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

723,528. Pit props. AKT.-GES. FUR VERWERTUNG UND INVESTITIONEN. May 31, 1951 [Dec. 31, 1948], No. 13003/51. Class 20 (2). A pit prop comprises channel irons 8, 9 as described and claimed in Specification 690,030 clamped together to allow longitudinal relative sliding under load. The clamp comprises hooks 10 engaging the edges of the channel iron 8 and connected together by a bolt 11 carrying an eccentric 12 acting on the channel iron 9 and operated by a lever.
GB13003/51A 1948-12-31 1951-05-31 Improvements in yieldable pit props Expired GB723528A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE723528X 1948-12-31

Publications (1)

Publication Number Publication Date
GB723528A true GB723528A (en) 1955-02-09

Family

ID=6632915

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13003/51A Expired GB723528A (en) 1948-12-31 1951-05-31 Improvements in yieldable pit props

Country Status (1)

Country Link
GB (1) GB723528A (en)

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