The comparatively recent and increasing interest evident in hydraulic percussive drilling for mining and civil works in hard rock has prompted considerable research, design and development activity by manufacturers. The advent and development of hydraulic drill design is discussed. The operation of such drills is described as being by the intermittent application of high pressure hydraulic oil to a double-acting piston, the frequency of applications being controlled by oil entry and discharge parts either uncovered by the movement of the piston, or by the action of a sliding or rotating valve, or by a combination of both. Advantages claimed for such drills include a reduction to one third of the total energy required from the prime source per foot drilled over that required for percussive drilling, a marked reduction in noise levels of between 3 and 17 db over a silenced pneumatic drill, and the elimination of oil and water vapour problems associated with the exhaust of compressed air drills. Disadvantages include the need for a high standard of engineering and maintenance service, and the particular precautions necessary when the use of electric motors in flammable atmospheres is involved. /TRRL/

  • Availability:
  • Corporate Authors:

    Mining Journal Limited

    15 Wilson Street
    London EC2M 2TR,   England 
  • Publication Date: 1976-9


  • English

Media Info

  • Features: Photos; Tables;
  • Pagination: p. 194-195
  • Serial:
    • Mining Magazine
    • Volume: 135
    • Issue Number: 3
    • Publisher: Mining Journal Limited
    • ISSN: 0308-6631

Subject/Index Terms

Filing Info

  • Accession Number: 00145390
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 13 1977 12:00AM