HYDRAULIC DRILLS SPEED THE WAY

A general description is given of three tunnelling projects in Switzerland in which Atlas Copco hydraulic drilling equipment is being used. The 15.4km Furka rail tunnels being constructed between Oberwald and Realp have a cross-section of 25sq m and are being excavated with an Atlas Copco track bound 5-boom PROMEC TH 414 electrically powered hydraulic drilling rig. The second project concerns the construction of a 3760M long headrace tunnel of 6.8M diameter as part of a pumped storage system at Lake Grimsel. Here an Atlas Copco boomer 131 drill rig with three booms which will be used to drive an access tunnel to a surge chamber where a PROMEC six-boom rig will then drive a tunnel of 41sq.m cross section. The third project is the 765M long double tunnel at Rugen to form part of the national highway N8. The two tunnels of 65sq.m section are being excavated on an uphill curve with a radius of 8000M. The drilling rig being used is of the PROMEC type equipped with two hydraulic booms powered by power packs driven by a 45kw motor. Operation of these hydraulic drills has given contractors the opportunity to assess their greater speed and lower noise level compared with the known reliability of pneumatic drilling equipment. /TRRL/

  • Availability:
  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Publication Date: 1975-11

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 34-36
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00137509
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 6 1976 12:00AM