The use of hydraulic rock drills in an Atlas Copco 1038 hd rig working on the megget water tunnel is described. The rig has been used to drill 40, 45 mm and 375 mm holes in a burn cut. Their rate of penetration is claimed to be 50 to 100 per cent higher than air pressure drills of the same weight class. This high drilling rate is achieved by the use of a working pressure 25 to 40 times greater than normal. The improved performance is gained at about one third of the power, although the initial cost is about double. The drill steel life is also improved. The mechanism used to adapt the drill for soft rock is described. The drill is simple to operate, despite its complex electrical circuitry, and has protective cut-outs to prevent damage if it is wrongly set. Operating conditions are also improved, there is no water and oil fog and less noise. /TRRL/

  • Availability:
  • Corporate Authors:

    IPC Building and Contract Journals Limited

    Surrey House, 1 Throwley Way
    Sutton, Surrey SM1 4QQ,   England 
  • Authors:
    • Goldring, Z
  • Publication Date: 1978-10-5

Media Info

  • Features: Photos;
  • Pagination: p. 30
  • Serial:
    • Volume: 285
    • Issue Number: 5170
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00189579
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 12 1979 12:00AM