HAMMERS FOR REACHING THE BOTTOM OF EXCAVATION HOLES

LES MARTEUX "FOND DE TROU"

The article recalls two drilling techniques: rotation and cutting with diamond tools and percussion with tungsten carbide tools. Details are given of the two types of carbide tools, and of the drilling tool: halcotrack 400H with hydraulically driven hammer for bottom of holes; one of its main advantages is the low noise level of the system (sound insulated air compressor); it moves on hydraulically driven crawler tracks; its mast is hydraulically positioned and its stand of drill pipe rotates also hydraulically. A device controls the pressure applied by the stand of drill pipe or the bits of the tool which the hammer hits. (TRRL)

  • Availability:
  • Corporate Authors:

    Editeur Dunod

    26 Boulevard de l'Hopital
    Paris 5e,   France 
  • Publication Date: 1978-8-9

Language

  • French

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 22-25
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00309236
  • Record Type: Publication
  • Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
  • Files: ITRD, TRIS
  • Created Date: Jun 26 1980 12:00AM